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  1. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  2. ;;                                                              ;;
  3. ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
  4. ;; Distributed under terms of the GNU General Public License    ;;
  5. ;;                                                              ;;
  6. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  7.  
  8. SYSTEM FUNCTIONS of OS Kolibri 0.7.7.0
  9.  
  10. Number of the function is located in the register eax.
  11. The call of the system function is executed by "int 0x40" command.
  12. All registers except explicitly declared in the returned value,
  13.     including eflags, are preserved.
  14.  
  15.  
  16. ======================================================================
  17. ============== Function 0 - define and draw the window. ==============
  18. ======================================================================
  19. Defines an application window. Draws a frame of the window, header and
  20. working area. For skinned windows defines standard close and minimize
  21. buttons.
  22. Parameters:
  23.   * eax = 0 - function number
  24.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  25.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  26.   * edx = 0xXYRRGGBB, where:
  27.     * Y = style of the window:
  28.       * Y=0 - type I - fixed-size window
  29.       * Y=1 - only define window area, draw nothing
  30.       * Y=2 - type II - variable-size window
  31.       * Y=3 - skinned window
  32.       * Y=4 - skinned fixed-size window
  33.       * other possible values (from 5 up to 15) are reserved,
  34.         function call with such Y is ignored
  35.     * RR, GG, BB = accordingly red, green, blue components of a color
  36.       of the working area of the window (are ignored for style Y=1)
  37.     * X = DCBA (bits)
  38.       * A = 1 - window has caption; for styles Y=3,4 caption string
  39.                   must be passed in edi, for other styles use
  40.                   subfunction 1 of function 71
  41.       * B = 1 - coordinates of all graphics primitives are relative to
  42.                   window client area
  43.       * C = 1 - don't fill working area on window draw
  44.       * D = 0 - normal filling of the working area, 1 - gradient
  45.     The following parameters are intended for windows
  46.     of a type I and II, and ignored for styles Y=1,3:
  47.   * esi = 0xXYRRGGBB - color of the header
  48.     * RR, GG, BB define color
  49.     * Y=0 - usual window, Y=1 - unmovable window (works for all window styles)
  50.     * X defines a gradient of header: X=0 - no gradient,
  51.       X=8 - usual gradient,
  52.       for windows of a type II X=4 - negative gradient
  53.     * other values of X and Y are reserved
  54.   * edi = 0x00RRGGBB - color of the frame
  55. Returned value:
  56.   * function does not return value
  57. Remarks:
  58.   * Position and sizes of the window are installed by the first
  59.     call of this function and are ignored at subsequent; to change
  60.     position and/or sizes of already created window use function 67.
  61.   * For windows with styles Y=3,4 and caption (A=1) caption string
  62.     is set by the first call of this function and is ignored
  63.     at subsequent (strictly speaking, is ignored after a call to
  64.     subfunction 2 of function 12 - end redraw); to change caption of
  65.     already created window use subfunction 1 of function 71.
  66.   * If the window has appropriate styles, position and/or sizes can be
  67.     changed by user. Current position and sizes can be obtained
  68.     by function 9.
  69.   * The window must fit on the screen. If the transferred
  70.     coordinates and sizes do not satisfy to this condition,
  71.     appropriate coordinate (or, probably, both) is considered as zero,
  72.     and if it does not help too, the appropriate size
  73.     (or, probably, both) is installed in a size of the screen.
  74.  
  75.     Further let us designate xpos,ypos,xsize,ysize - values passed
  76.     in ebx,ecx. The coordinates are resulted concerning
  77.     the left upper corner of the window, which, thus, is set as (0,0),
  78.     coordinates of the right lower corner essence (xsize,ysize).
  79.   * The sizes of the window are understood in sence of coordinates
  80.     of the right lower corner. This concerns all other functions too.
  81.     It means, that the real sizes are on 1 pixel more.
  82.   * The window of type I looks as follows:
  83.     * draw external frame of color indicated in edi, 1 pixel in width
  84.     * draw header - rectangle with the left upper corner (1,1) and
  85.       right lower (xsize-1,min(20,ysize-1)) color indicated in esi
  86.       (taking a gradient into account)
  87.     * if ysize>21, fill the working area of the window -
  88.       rectangle with the left upper corner (1,21) and right lower
  89.       (xsize-1,ysize-1) (sizes (xsize-1)*(ysize-21)) with color
  90.       indicated in edx (taking a gradient into account)
  91.     * if A=1 and caption has been already set by subfunction 1
  92.       of function 71, it is drawn in the corresponding place of header
  93.   * The window of style Y=1 looks as follows:
  94.     * completely defined by the application
  95.   * The window of type II looks as follows:
  96.     * draw external frame of width 1 pixel with the "shaded" color
  97.       edi (all components of the color decrease twice)
  98.     * draw intermediate frame of width 3 pixels with color edi
  99.     * draw internal frame of width 1 pixel with the "shaded" color edi
  100.     * draw header - rectangle with the left upper corner (4,4)
  101.       and right lower (xsize-4,min(20,ysize)) color, indicated in esi
  102.       (taking a gradient into account)
  103.     * if ysize>=26, fill the working area of the window -
  104.       rectangle with the left upper corner (5,20) and right lower
  105.       (xsize-5,ysize-5) with color indicated in edx
  106.       (taking a gradient into account)
  107.     * if A=1 and caption has been already set by subfunction 1
  108.       of function 71, it is drawn in the corresponding place of header
  109.   * The skinned window looks as follows:
  110.     * draw external frame of width 1 pixel
  111.       with color 'outer' from the skin
  112.     * draw intermediate frame of width 3 pixel
  113.       with color 'frame' from the skin
  114.     * draw internal frame of width 1 pixel
  115.       with color 'inner' from the skin
  116.     * draw header (on bitmaps from the skin) in a rectangle
  117.       (0,0) - (xsize,_skinh-1)
  118.     * if ysize>=26, fill the working area of the window -
  119.       rectangle with the left upper corner (5,_skinh) and right lower
  120.       (xsize-5,ysize-5) with color indicated in edx
  121.       (taking a gradient into account)
  122.     * define two standard buttons: close and minimize
  123.       (see function 8)
  124.     * if A=1 and edi contains (nonzero) pointer to caption string,
  125.       it is drawn in place in header defined in the skin
  126.     * value _skinh is accessible as the result of call
  127.       subfunction 4 of function 48
  128.  
  129. ======================================================================
  130. ================ Function 1 - put pixel in the window. ===============
  131. ======================================================================
  132. Parameters:
  133.   * eax = 1 - function number
  134.   * ebx = x-coordinate (relative to the window)
  135.   * ecx = y-coordinate (relative to the window)
  136.   * edx = 0x00RRGGBB - color of a pixel
  137.     edx = 0x01xxxxxx - invert color of a pixel
  138.           (low 24 bits are ignored)
  139. Returned value:
  140.   * function does not return value
  141.  
  142. ======================================================================
  143. ============ Function 2 - get the code of the pressed key. ===========
  144. ======================================================================
  145. Takes away the code of the pressed key from the buffer.
  146. Parameters:
  147.   * eax = 2 - function number
  148. Returned value:
  149.   * if the buffer is empty, function returns eax=1
  150.   * if the buffer is not empty, function returns al=0,
  151.     ah=code of the pressed key, high word of eax is zero
  152.   * if there is "hotkey", function returns al=2,
  153.     ah=scancode of the pressed key (0 for control keys),
  154.     high word of eax contains a status of control keys at the moment
  155.     of pressing a hotkey
  156. Remarks:
  157.   * There is a common system buffer of the pressed keys
  158.     by a size of 120 bytes, organized as queue.
  159.   * There is one more common system buffer on 120 "hotkeys".
  160.   * If the application with the inactive window calls this function,
  161.     the buffer of the pressed keys is considered to be empty.
  162.   * By default this function returns ASCII-codes; to switch
  163.     to the scancodes mode (and back) use function 66.
  164.     However, hotkeys are always notificated as scancodes.
  165.   * To find out, what keys correspond to what codes, start
  166.     the application keyascii and scancode.
  167.   * Scancodes come directly from keyboard and are fixed;
  168.     ASCII-codes turn out with usage of the conversion tables,
  169.     which can be set by subfunction 2 of function 21
  170.     and get by subfunction 2 of function 26.
  171.   * As a consequence, ASCII-codes take into account current
  172.     keyboard layout (rus/en) as opposed to scancodes.
  173.   * This function notifies only about those hotkeys, which were
  174.     defined by this thread by subfunction 4 of function 66.
  175.  
  176. ======================================================================
  177. ==================== Function 3 - get system time. ===================
  178. ======================================================================
  179. Parameters:
  180.   * eax = 3 - function number
  181. Returned value:
  182.   * eax = 0x00SSMMHH, where HH:MM:SS = Hours:Minutes:Seconds
  183.   * each item is BCD-number, for example,
  184.     for time 23:59:59 function returns 0x00595923
  185. Remarks:
  186.   * See also subfunction 9 of function 26 - get time from
  187.     the moment of start of the system; it is more convenient, because
  188.     returns simply DWORD-value of the time counter.
  189.   * System time can be set by function 22.
  190.  
  191. ======================================================================
  192. ============ Function 4 - draw text string in the window. ============
  193. ======================================================================
  194. Parameters:
  195.   * eax = 4 - function number
  196.   * ebx = [coordinate on axis x]*65536 + [coordinate on axis y]
  197.   * ecx = 0xXYRRGGBB, where
  198.     * RR, GG, BB specify text color
  199.     * X=ABnn (bits):
  200.       * nn specifies the used font: 0=system monospaced,
  201.         1=system font of variable width
  202.       * A=0 - output esi characters, A=1 - output ASCIIZ-string
  203.       * B=1 - fill background with the color edi
  204.     * Y = Cnnn
  205.       * C=1 redirect the output to the user area, specified in edi
  206.       * nnn - not used in the current, must be 0 (zero)
  207.   * edx = pointer to the beginning of the string
  208.   * esi = for A=0 length of the string, must not exceed 255;
  209.           for A=1 is ignored
  210.   * edi = color to fill background, if B=1
  211.   * edi = pointer to user area, for redirect, if C=1
  212.  
  213. Returned value:
  214.   * function does not return value
  215. Remarks:
  216.   * First system font is read out at loading from the file char.mt,
  217.     second - from char2.mt.
  218.   * Both fonts have height 9 pixels, width of the monospaced font
  219.     is equal to 6 pixels.
  220.   * C=1, pixel depth = 32 bits, user area is as follows:
  221.     dword Xsize
  222.     dword Ysize
  223.     rest of the area = Xsize * Y size * 4
  224.   * You can not use B = 1 and C = 1, at the same time. Since in both
  225.     cases, the register edi is used for different purposes.
  226.  
  227. ======================================================================
  228. ========================= Function 5 - delay. ========================
  229. ======================================================================
  230. Delays execution of the program on the given time.
  231. Parameters:
  232.   * eax = 5 - function number
  233.   * ebx = time in the 1/100 of second
  234. Returned value:
  235.   * function does not return value
  236. Remarks:
  237.   * Passing ebx=0 does not transfer control to the next process
  238.     and does not make any operations at all. If it is really required
  239.     to transfer control to the next process (to complete a current
  240.     time slice), use subfunction 1 of function 68.
  241.  
  242. ======================================================================
  243. ============== Function 6 - read the file from ramdisk. ==============
  244. ======================================================================
  245. Parameters:
  246.   * eax = 6 - function number
  247.   * ebx = pointer to the filename
  248.   * ecx = number of start block, beginning from 1;
  249.     ecx=0 - read from the beginning of the file (same as ecx=1)
  250.   * edx = number of blocks to read;
  251.     edx=0 - read one block (same as edx=1)
  252.   * esi = pointer to memory area for the data
  253. Returned value:
  254.   * eax = file size in bytes, if the file was successfully read
  255.   * eax = -1, if the file was not found
  256. Remarks:
  257.   * This function is out-of-date; function 70 allows
  258.     to fulfil the same operations with the extended possibilities.
  259.   * Block = 512 bytes.
  260.   * For reading all file you can specify the certainly large value
  261.     in edx, for example, edx = -1; but in this case be ready that
  262.     the program will "fall", if the file will appear too large and can
  263.     not be placed in the program memory.
  264.   * The filename must be either in the format 8+3 characters
  265.     (first 8 characters - name itself, last 3 - extension,
  266.     the short names and extensions are supplemented with spaces),
  267.     or in the format 8.3 characters "FILE.EXT"/"FILE.EX "
  268.     (name no more than 8 characters, dot, extension 3 characters
  269.     supplemented if necessary by spaces).
  270.     The filename must be written with capital letters. The terminating
  271.     character with code 0 is not necessary (not ASCIIZ-string).
  272.   * This function does not support folders on the ramdisk.
  273.  
  274. ======================================================================
  275. =============== Function 7 - draw image in the window. ===============
  276. ======================================================================
  277. Paramters:
  278.   * eax = 7 - function number
  279.   * ebx = pointer to the image in the format BBGGRRBBGGRR...
  280.   * ecx = [size on axis x]*65536 + [size on axis y]
  281.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  282. Returned value:
  283.   * function does not return value
  284. Remarks:
  285.   * Coordinates of the image are coordinates of the upper left corner
  286.     of the image relative to the window.
  287.   * Size of the image in bytes is 3*xsize*ysize.
  288.  
  289. ======================================================================
  290. =============== Function 8 - define/delete the button. ===============
  291. ======================================================================
  292. Parameters for button definition:
  293.   * eax = 8 - function number
  294.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  295.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  296.   * edx = 0xXYnnnnnn, where:
  297.     * nnnnnn = identifier of the button
  298.     * high (31st) bit of edx is cleared
  299.     * if 30th bit of edx is set - do not draw the button
  300.     * if 29th bit of edx is set - do not draw a frame
  301.       at pressing the button
  302.   * esi = 0x00RRGGBB - color of the button
  303. Parameters for button deleting:
  304.   * eax = 8 - function number
  305.   * edx = 0x80nnnnnn, where nnnnnn - identifier of the button
  306. Returned value:
  307.   * function does not return value
  308. Remarks:
  309.   * Sizes of the button must be more than 0 and less than 0x8000.
  310.   * For skinned windows definition of the window
  311.     (call of 0th function) creates two standard buttons -
  312.     for close of the window with identifier 1 and
  313.     for minimize of the window with identifier 0xffff.
  314.   * The creation of two buttons with same identifiers is admitted.
  315.   * The button with the identifier 0xffff at pressing is interpreted
  316.     by the system as the button of minimization, the system handles
  317.     such pressing independently, not accessing to the application.
  318.     In rest it is usual button.
  319.   * Total number of buttons for all applications is limited to 4095.
  320.  
  321. ======================================================================
  322. ============ Function 9 - information on execution thread. ===========
  323. ======================================================================
  324. Parameters:
  325.   * eax = 9 - function number
  326.   * ebx = pointer to 1-Kb buffer
  327.   * ecx = number of the slot of the thread
  328.     ecx = -1 - get information on the current thread
  329. Returned value:
  330.   * eax = maximum number of the slot of a thread
  331.   * buffer pointed to by ebx contains the following information:
  332.     * +0: dword: usage of the processor (how many time units
  333.       per second leaves on execution of this thread)
  334.     * +4: word: position of the window of thread in the window stack
  335.     * +6: word: (has no relation to the specified thread)
  336.       number of the thread slot, which window has in the window stack
  337.       position ecx
  338.     * +8: word: reserved
  339.     * +10 = +0xA: 11 bytes: name of the process
  340.       (name of the started file - executable file without extension)
  341.     * +21 = +0x15: byte: reserved, this byte is not changed
  342.     * +22 = +0x16: dword: address of the process in memory
  343.     * +26 = +0x1A: dword: size of used memory - 1
  344.     * +30 = +0x1E: dword: identifier (PID/TID)
  345.     * +34 = +0x22: dword: coordinate of the thread window on axis x
  346.     * +38 = +0x26: dword: coordinate of the thread window on axis y
  347.     * +42 = +0x2A: dword: size of the thread window on axis x
  348.     * +46 = +0x2E: dword: size of the thread window on axis y
  349.     * +50 = +0x32: word: status of the thread slot:
  350.       * 0 = thread is running
  351.       * 1 = thread is suspended
  352.       * 2 = thread is suspended while waiting for event
  353.       * 3 = thread is terminating as a result of call to function -1
  354.         or under duress as a result of call to subfunction 2
  355.         of function 18 or termination of the system
  356.       * 4 = thread is terminating as a result of exception
  357.       * 5 = thread waits for event
  358.       * 9 = requested slot is free, all other information on the slot
  359.         is not meaningful
  360.     * +52 = +0x34: word: reserved, this word is not changed
  361.     * +54 = +0x36: dword: coordinate of the client area on axis x
  362.     * +58 = +0x3A: dword: coordinate of the client area on axis y
  363.     * +62 = +0x3E: dword: width of the client area
  364.     * +66 = +0x42: dword: height of the client area
  365.     * +70 = +0x46: byte: state of the window - bitfield
  366.       * bit 0 (mask 1): window is maximized
  367.       * bit 1 (mask 2): window is minimized to panel
  368.       * bit 2 (mask 4): window is rolled up
  369.     * +71 = +0x47: dword: event mask
  370.     * +75 = +0x4B: byte: keyboard mode(ASCII = 0; SCAN = 1)
  371. Remarks:
  372.   * Slots are numbered starting from 1.
  373.   * Returned value is not a total number of threads, because there
  374.     can be free slots.
  375.   * When process is starting, system automatically creates
  376.     execution thread.
  377.   * Function gives information on the thread. Each process has
  378.     at least one thread. One process can create many threads,
  379.     in this case each thread has its own slot and the fields
  380.     +10, +22, +26 in these slots coincide.
  381.     Applications have no common way to define whether two threads
  382.     belong to one process.
  383.   * The active window - window on top of the window stack -
  384.     receives the messages on a keyboard input. For such window
  385.     the position in the window stack coincides with returned value.
  386.   * Slot 1 corresponds to special system thread, for which:
  387.     * the window is in the bottom of the window stack, the fields
  388.       +4 and +6 contain value 1
  389.     * name of the process - "OS/IDLE" (supplemented by spaces)
  390.     * address of the process in memory is 0, size of used memory is
  391.       16 Mb (0x1000000)
  392.     * PID=1
  393.     * coordinates and sizes of the window and the client area are by
  394.       convention set to 0
  395.     * status of the slot is always 0 (running)
  396.     * the execution time adds of time leaving on operations itself
  397.       and idle time in waiting for interrupt (which can be got by call
  398.       to subfunction 4 of function 18).
  399.   * Beginning from slot 2, the normal applications are placed.
  400.   * The normal applications are placed in memory at the address
  401.     0 (kernel constant 'std_application_base_address').
  402.     There is no intersection, as each process has its own page table.
  403.   * At creation of the thread it is assigned the slot
  404.     in the system table and identifier (Process/Thread IDentifier =
  405.     PID/TID), which do not vary with time for given thread.
  406.     After completion of the thread its slot can be anew used
  407.     for another thread. The thread identifier can not be assigned
  408.     to other thread even after completion of this thread.
  409.     Identifiers, assigned to new threads, grow monotonously.
  410.   * If the thread has not yet defined the window by call to
  411.     function 0, the position and the sizes
  412.     of its window are considered to be zero.
  413.   * Coordinates of the client area are relative to the window.
  414.   * At the moment only the part of the buffer by a size
  415.     76 = 0x4C bytes is used. Nevertheless it is recommended to use
  416.     1-Kb buffer for the future compatibility, in the future
  417.     some fields can be added.
  418.  
  419. ======================================================================
  420. ==================== Function 10 - wait for event. ===================
  421. ======================================================================
  422. If the message queue is empty, waits for appearance of the message
  423. in queue. In this state thread does not consume CPU time.
  424. Then reads out the message from queue.
  425.  
  426. Parameters:
  427.   * eax = 10 - function number
  428. Returned value:
  429.   * eax = event (see the list of events)
  430. Remarks:
  431.   * Those events are taken into account only which enter into
  432.     a mask set by function 40. By default it is
  433.     redraw, key and button events.
  434.   * To check, whether there is a message in queue, use function 11.
  435.     To wait for no more than given time, use function 23.
  436.  
  437. ======================================================================
  438. =============== Function 11 - check for event, no wait. ==============
  439. ======================================================================
  440. If the message queue contains event, function reads out
  441. and return it. If the queue is empty, function returns 0.
  442. Parameters:
  443.   * eax = 11 - function number
  444. Returned value:
  445.   * eax = 0 - message queue is empty
  446.   * else eax = event (see the list of events)
  447. Remarks:
  448.   * Those events are taken into account only, which enter into
  449.     a mask set by function 40. By default it is
  450.     redraw, key and button events.
  451.   * To wait for event, use function 10.
  452.     To wait for no more than given time, use function 23.
  453.  
  454. ======================================================================
  455. =============== Function 12 - begin/end window redraw. ===============
  456. ======================================================================
  457.  
  458. ---------------- Subfunction 1 - begin window redraw. ----------------
  459. Parameters:
  460.   * eax = 12 - function number
  461.   * ebx = 1 - subfunction number
  462. Returned value:
  463.   * function does not return value
  464.  
  465. ----------------- Subfunction 2 - end window redraw. -----------------
  466. Parameters:
  467.   * eax = 12 - function number
  468.   * ebx = 2 - subfunction number
  469. Returned value:
  470.   * function does not return value
  471. Remarks:
  472.   * Subfunction 1 deletes all buttons defined with
  473.     function 8, they must be defined again.
  474.  
  475. ======================================================================
  476. ============ Function 13 - draw a rectangle in the window. ===========
  477. ======================================================================
  478. Parameters:
  479.   * eax = 13 - function number
  480.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  481.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  482.   * edx = color 0xRRGGBB or 0x80RRGGBB for gradient fill
  483. Returned value:
  484.   * function does not return value
  485. Remarks:
  486.   * Coordinates are understood as coordinates of the left upper corner
  487.     of a rectangle relative to the window.
  488.  
  489. ======================================================================
  490. =================== Function 14 - get screen size. ===================
  491. ======================================================================
  492. Parameters:
  493.   * eax = 14 - function number
  494. Returned value:
  495.   * eax = [xsize]*65536 + [ysize], where
  496.   * xsize = x-coordinate of the right lower corner of the screen =
  497.             horizontal size - 1
  498.   * ysize = y-coordinate of the right lower corner of the screen =
  499.             vertical size - 1
  500. Remarks:
  501.   * See also subfunction 5 of function 48 - get sizes of
  502.     working area of the screen.
  503.  
  504. ======================================================================
  505. == Function 15, subfunction 1 - set a size of the background image. ==
  506. ======================================================================
  507. Parameters:
  508.   * eax = 15 - function number
  509.   * ebx = 1 - subfunction number
  510.   * ecx = width of the image
  511.   * edx = height of the image
  512. Returned value:
  513.   * function does not return value
  514. Remarks:
  515.   * Before calling subfunctions 2 and 5 you should call this function
  516.     to set image size!
  517.   * For update of the screen (after completion of a series of commands
  518.     working with a background) call subfunction 3.
  519.   * There is a pair function for get size of the background image -
  520.     subfunction 1 of function 39.
  521.  
  522. ======================================================================
  523. === Function 15, subfunction 2 - put pixel on the background image. ==
  524. ======================================================================
  525. Parameters:
  526.   * eax = 15 - function number
  527.   * ebx = 2 - subfunction number
  528.   * ecx = offset
  529.   * edx = color of a pixel 0xRRGGBB
  530. Returned value:
  531.   * function does not return value
  532. Remarks:
  533.   * Offset for a pixel with coordinates (x,y) is calculated as
  534.     (x+y*xsize)*3.
  535.   * If the given offset exceeds size set by subfunction 1,
  536.     the call is ignored.
  537.   * For update of the screen (after completion of a series of commands
  538.     working with a background) call subfunction 3.
  539.   * There is a pair function for get pixel on the background image -
  540.     subfunction 2 of function 39.
  541.  
  542. ======================================================================
  543. =========== Function 15, subfunction 3 - redraw background. ==========
  544. ======================================================================
  545. Parameters:
  546.   * eax = 15 - function number
  547.   * ebx = 3 - subfunction number
  548. Returned value:
  549.   * function does not return value
  550.  
  551. ======================================================================
  552. == Function 15, subfunction 4 - set drawing mode for the background. =
  553. ======================================================================
  554. Parameters:
  555.   * eax = 15 - function number
  556.   * ebx = 4 - subfunction number
  557.   * ecx = drawing mode:
  558.     * 1 = tile
  559.     * 2 = stretch
  560. Returned value:
  561.   * function does not return value
  562. Remarks:
  563.   * For update of the screen (after completion of a series of commands
  564.     working with a background) call subfunction 3.
  565.   * There is a pair function for get drawing mode of the background -
  566.     subfunction 4 of function 39.
  567.  
  568. ======================================================================
  569. ===================== Function 15, subfunction 5 =====================
  570. ============ Put block of pixels on the background image. ============
  571. ======================================================================
  572. Parameters:
  573.   * eax = 15 - function number
  574.   * ebx = 5 - subfunction number
  575.   * ecx = pointer to the data in the format BBGGRRBBGGRR...
  576.   * edx = offset in data of the background image
  577.   * esi = size of data in bytes = 3 * number of pixels
  578. Returned value:
  579.   * function does not return value
  580. Remarks:
  581.   * Offset and size are not checked for correctness.
  582.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  583.   * Pixels of the background image are written sequentially
  584.     from left to right, from up to down.
  585.   * Offset of pixel with coordinates (x,y) is (x+y*xsize)*3.
  586.   * For update of the screen (after completion of a series of commands
  587.     working with a background) call subfunction 3.
  588.  
  589. ======================================================================
  590. ===================== Function 15, subfunction 6 =====================
  591. ======== Map background data to the address space of process. ========
  592. ======================================================================
  593. Parameters:
  594.   * eax = 15 - function number
  595.   * ebx = 6 - subfunction number
  596. Returned value:
  597.   * eax = pointer to background data, 0 if error
  598. Remarks:
  599.   * Mapped data are available for read and write.
  600.   * Size of background data is 3*xsize*ysize. The system blocks
  601.     changes of background sizes while process works with mapped data.
  602.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  603.   * Pixels of the background image are written sequentially
  604.     from left to right, from up to down.
  605.  
  606. ======================================================================
  607. ===== Function 15, subfunction 7 - close mapped background data. =====
  608. ======================================================================
  609. Parameters:
  610.   * eax = 15 - function number
  611.   * ebx = 7 - subfunction number
  612.   * ecx = pointer to mapped data
  613. Returned value:
  614.   * eax = 1 - success, 0 - error
  615.  
  616. ======================================================================
  617. ===================== Function 15, subfunction 8 =====================
  618. ============= Get coordinates of last draw the background ============
  619. ======================================================================
  620. Parameters:
  621.   * eax = 15 - function number
  622.   * ebx = 8 - subfunction number
  623. Returned value:
  624.   * eax = [left]*65536 + [right]
  625.   * ebx = [top]*65536 + [bottom]
  626. Remarks:
  627.   * (left,top) are coordinates of the left upper corner,
  628.     (right,bottom) are coordinates of the right lower one.
  629.   * For receiving more reliable information, call the function
  630.     immediately after the event:
  631.              5 = kernel finished redrawing of the desktop background
  632.  
  633. ======================================================================
  634. ===================== Function 15, subfunction 9 =====================
  635. ============= Redraws a rectangular part of the background ===========
  636. ======================================================================
  637. Parameters:
  638.   * eax = 15 - function number
  639.   * ebx = 9 - subfunction number
  640.   * ecx = [left]*65536 + [right]
  641.   * edx = [top]*65536 + [bottom]
  642. Returned value:
  643.   * function does not return value
  644. Remarks:
  645.   * (left,top) are coordinates of the left upper corner,
  646.     (right,bottom) are coordinates of the right lower one.
  647.   * If parameters are set incorrectly then background is not redrawn.
  648.  
  649. ======================================================================
  650. =============== Function 16 - save ramdisk on a floppy. ==============
  651. ======================================================================
  652. Parameters:
  653.   * eax = 16 - function number
  654.   * ebx = 1 or ebx = 2 - on which floppy save
  655. Returned value:
  656.   * eax = 0 - success
  657.   * eax = 1 - error
  658.  
  659. ======================================================================
  660. ======= Function 17 - get the identifier of the pressed button. ======
  661. ======================================================================
  662. Takes away the code of the pressed button from the buffer.
  663. Parameters:
  664.   * eax = 17 - function number
  665. Returned value:
  666.   * if the buffer is empty, function returns eax=1
  667.   * if the buffer is not empty:
  668.     * high 24 bits of eax contain button identifier (in particular,
  669.       ah contains low byte of the identifier; if all buttons have
  670.       the identifier less than 256, ah is enough to distinguish)
  671.     * al = 0 - the button was pressed with left mouse button
  672.     * al = bit corresponding to used mouse button otherwise
  673. Remarks:
  674.   * "Buffer" keeps only one button, at pressing the new button the
  675.     information about old is lost.
  676.   * The call of this function by an application with inactive window
  677.     will return answer "buffer is empty".
  678.   * Returned value for al corresponds to the state of mouse buttons
  679.     as in subfunction 2 of function 37 at the beginning
  680.     of button press, excluding lower bit, which is cleared.
  681.  
  682. ======================================================================
  683. ===================== Function 18, subfunction 1 =====================
  684. ============= Make deactive the window of the given thread. ==========
  685. ======================================================================
  686. Parameters:
  687.   * eax = 18 - function number
  688.   * ebx = 1 - subfunction number
  689.   * ecx = number of the thread slot
  690. Returned value:
  691.   * function does not return value
  692.  
  693. ======================================================================
  694. = Function 18, subfunction 2 - terminate process/thread by the slot. =
  695. ======================================================================
  696. Parameters:
  697.   * eax = 18 - function number
  698.   * ebx = 2 - subfunction number
  699.   * ecx = number of the slot of process/thread
  700. Returned value:
  701.   * function does not return value
  702. Remarks:
  703.   * It is impossible to terminate system thread OS/IDLE (with
  704.     number of the slot 1),
  705.     it is possible to terminate any normal process/thread.
  706.   * See also subfunction 18 - terminate
  707.     process/thread by the identifier.
  708.  
  709. ======================================================================
  710. ===================== Function 18, subfunction 3 =====================
  711. ============= Make active the window of the given thread. ============
  712. ======================================================================
  713. Parameters:
  714.   * eax = 18 - function number
  715.   * ebx = 3 - subfunction number
  716.   * ecx = number of the thread slot
  717. Returned value:
  718.   * function does not return value
  719. Remarks:
  720.   * If correct, but nonexistent slot is given,
  721.     some window is made active.
  722.   * To find out, which window is active, use subfunction 7.
  723.  
  724. ======================================================================
  725. ===================== Function 18, subfunction 4 =====================
  726. =========== Get counter of idle time units per one second. ===========
  727. ======================================================================
  728. Idle time units are units, in which the processor stands idle
  729. in waiting for interrupt (in the command 'hlt').
  730.  
  731. Parameters:
  732.   * eax = 18 - function number
  733.   * ebx = 4 - subfunction number
  734. Returned value:
  735.   * eax = value of the counter of idle time units per one second
  736.  
  737. ======================================================================
  738. ========== Function 18, subfunction 5 - get CPU clock rate. ==========
  739. ======================================================================
  740. Parameters:
  741.   * eax = 18 - function number
  742.   * ebx = 5 - subfunction number
  743. Returned value:
  744.   * eax = clock rate (modulo 2^32 clock ticks = 4GHz)
  745.  
  746. ======================================================================
  747.  Function 18, subfunction 6 - save ramdisk to the file on hard drive.
  748. ======================================================================
  749. Parameters:
  750.   * eax = 18 - function number
  751.   * ebx = 6 - subfunction number
  752.   * ecx = pointer to the full path to file
  753.     (for example, "/hd0/1/kolibri/kolibri.img")
  754. Returned value:
  755.   * eax = 0 - success
  756.   * else eax = error code of the file system
  757. Remarks:
  758.   * All folders in the given path must exist, otherwise function
  759.     returns value 5, "file not found".
  760.  
  761. ======================================================================
  762. =========== Function 18, subfunction 7 - get active window. ==========
  763. ======================================================================
  764. Parameters:
  765.   * eax = 18 - function number
  766.   * ebx = 7 - subfunction number
  767. Returned value:
  768.   * eax = number of the active window
  769.     (number of the slot of the thread with active window)
  770. Remarks:
  771.   * Active window is at the top of the window stack and receives
  772.     messages on all keyboard input.
  773.   * To make a window active, use subfunction 3.
  774.  
  775. ======================================================================
  776. == Function 18, subfunction 8 - disable/enable the internal speaker. =
  777. ======================================================================
  778. If speaker sound is disabled, all calls to subfunction 55 of
  779. function 55 are ignored. If speaker sound is enabled,
  780. they are routed on builtin speaker.
  781.  
  782. ------------------- Subsubfunction 1 - get status. -------------------
  783. Parameters:
  784.   * eax = 18 - function number
  785.   * ebx = 8 - subfunction number
  786.   * ecx = 1 - number of the subsubfunction
  787. Returned value:
  788.   * eax = 0 - speaker sound is enabled; 1 - disabled
  789.  
  790. ----------------- Subsubfunction 2 - toggle status. ------------------
  791. Toggles states of disable/enable.
  792. Parameters:
  793.   * eax = 18 - function number
  794.   * ebx = 8 - subfunction number
  795.   * ecx = 2 - number of the subsubfunction
  796. Returned value:
  797.   * function does not return value
  798.  
  799. ======================================================================
  800. == Function 18, subfunction 9 - system shutdown with the parameter. ==
  801. ======================================================================
  802. Parameters:
  803.   * eax = 18 - function number
  804.   * ebx = 9 - subfunction number
  805.   * ecx = parameter:
  806.     * 2 = turn off computer
  807.     * 3 = reboot computer
  808.     * 4 = restart the kernel from the file 'kernel.mnt' on ramdisk
  809. Returned value:
  810.   * at incorrect ecx the registers do not change (i.e. eax=18)
  811.   * by correct call function always returns eax=0
  812.     as the tag of success
  813. Remarks:
  814.   * Do not rely on returned value by incorrect call, it can be
  815.     changed in future versions of the kernel.
  816.  
  817. ======================================================================
  818. ===== Function 18, subfunction 10 - minimize application window. =====
  819. ======================================================================
  820. Minimizes the own window.
  821. Parameters:
  822.   * eax = 18 - function number
  823.   * ebx = 10 - subfunction number
  824. Returned value:
  825.   * function does not return value
  826. Remarks:
  827.   * The minimized window from the point of view of function 9
  828.     keeps position and sizes.
  829.   * Restoring of an application window occurs at its activation by
  830.     subfunction 3.
  831.   * Usually there is no necessity to minimize/restire a window
  832.     obviously: minimization of a window is carried out by the system
  833.     at pressing the minimization button (for skinned windows
  834.     it is defined automatically by function 0,
  835.     for other windows it can be defined manually by function 8),
  836.     restore of a window is done by the application '@panel'.
  837.  
  838. ======================================================================
  839.  Function 18, subfunction 11 - get information on the disk subsystem.
  840. ======================================================================
  841. Parameters:
  842.   * eax = 18 - function number
  843.   * ebx = 11 - subfunction number
  844.   * ecx = type of the table:
  845.     * 1 = short version, 10 bytes
  846.     * 2 = full version, 65536 bytes
  847.   * edx = pointer to the buffer (in the application) for the table
  848. Returned value:
  849.   * function does not return value
  850. Format of the table: short version:
  851.   * +0: byte: information about FDD's (drives for floppies),
  852.     AAAABBBB, where AAAA gives type of the first drive, BBBB -
  853.     of the second regarding to the following list:
  854.     * 0 = there is no drive
  855.     * 1 = 360Kb, 5.25''
  856.     * 2 = 1.2Mb, 5.25''
  857.     * 3 = 720Kb, 3.5''
  858.     * 4 = 1.44Mb, 3.5''
  859.     * 5 = 2.88Mb, 3.5'' (such drives are not used anymore)
  860.     For example, for the standard configuration from one 1.44-drive
  861.     here will be 40h, and for the case 1.2Mb on A: and 1.44Mb on B:
  862.     the value is 24h.
  863.   * +1: byte: information about hard disks and CD-drives, AABBCCDD,
  864.     where AA corresponds to the controller IDE0, ..., DD - IDE3:
  865.     * 0 = device is absent
  866.     * 1 = hard drive
  867.     * 2 = CD-drive
  868.     For example, in the case HD on IDE0 and CD on IDE2
  869.     this field contains 48h.
  870.   * +2: 4 db: number of the retrieved partitions on hard disks
  871.     at accordingly IDE0,...,IDE3.
  872.     If the hard disk on IDEx is absent, appropriate byte is zero,
  873.     otherwise it shows number of the recognized partitions, which
  874.     can be not presented (if the drive is not formatted or if
  875.     the file system is not supported). Current version of the kernel
  876.     supports only FAT16, FAT32 and NTFS for hard disks.
  877.   * +6: 4 db: reserved
  878. Format of the table: full version:
  879.   * +0: 10 db: same as for the short version
  880.   * +10: 100 db: data for the first partition
  881.   * +110: 100 db: data for the second partition
  882.   * ...
  883.   * +10+100*(n-1): 100 db: data for the last partition
  884. The partitions are located as follows: at first sequentially all
  885. recoginzed partitions on HD on IDE0 (if present),
  886. then on HD on IDE1 (if present) and so on up to IDE3.
  887. Format of the information about partition
  888. (at moment only FAT is supported):
  889.   * +0: dword: first physical sector of the partition
  890.   * +4: dword: last physical sector of the partition
  891.     (belongs to the partition)
  892.   * +8: byte: file system type:
  893.     16=FAT16, 32=FAT32, 1=NTFS
  894.   * other data are dependent on file system, are modified with
  895.     kernel modifications and therefore are not described
  896. Remarks:
  897.   * The short table can be used for obtaining the information about
  898.     available devices.
  899.  
  900. ======================================================================
  901. ========== Function 18, subfunction 13 - get kernel version. =========
  902. ======================================================================
  903. Parameters:
  904.   * eax = 18 - function number
  905.   * ebx = 13 - subfunction number
  906.   * ecx = pointer to the buffer (not less than 16 bytes), where
  907.     the information will be placed
  908. Returned value:
  909.   * function does not return value
  910. Structure of the buffer:
  911. db a,b,c,d for version a.b.c.d
  912. db 0: reserved
  913. dd REV - kernel SVN revision number
  914. For Kolibri 0.7.7.0+ kernel:
  915. db 0,7,7,0
  916. db 0
  917. dd 1675
  918.  
  919. ======================================================================
  920. ======= Function 18, subfunction 14 - wait for screen retrace. =======
  921. ======================================================================
  922. Waits for the beginning of retrace of the scanning ray of the screen
  923. monitor.
  924. Parameters:
  925.   * eax = 18 - function number
  926.   * ebx = 14 - subfunction number
  927. Returned value:
  928.   * eax = 0 as the tag of success
  929. Remarks:
  930.   * Function is intended only for active high-efficiency graphics
  931.     applications; is used for smooth output of a graphics.
  932.  
  933. ======================================================================
  934. == Function 18, subfunction 15 - center mouse cursor on the screen. ==
  935. ======================================================================
  936. Parameters:
  937.   * eax = 18 - function number
  938.   * ebx = 15 - subfunction number
  939. Returned value:
  940.   * eax = 0 as the tag of success
  941.  
  942. ======================================================================
  943. ========= Function 18, subfunction 16 - get size of free RAM. ========
  944. ======================================================================
  945. Parameters:
  946.   * eax = 18 - function number
  947.   * ebx = 16 - subfunction number
  948. Returned value:
  949.   * eax = size of free memory in kilobytes
  950.  
  951. ======================================================================
  952. ======== Function 18, subfunction 17 - get full amount of RAM. =======
  953. ======================================================================
  954. Parameters:
  955.   * eax = 18 - function number
  956.   * ebx = 17 - subfunction number
  957. Returned value:
  958.   * eax = total size of existing memory in kilobytes
  959.  
  960. ======================================================================
  961. ===================== Function 18, subfunction 18 ====================
  962. ============= Terminate process/thread by the identifier. ============
  963. ======================================================================
  964. Parameters:
  965.   * eax = 18 - function number
  966.   * ebx = 18 - subfunction number
  967.   * ecx = identifer of process/thread (PID/TID)
  968. Returned value:
  969.   * eax = 0 - success
  970.   * eax = -1 - error (process is not found or is system)
  971. Remarks:
  972.   * It is impossible to terminate system thread OS/IDLE (identifier
  973.     1), it is possible to terminate any normal process/thread.
  974.   * See also subfunction 2 - terminate
  975.     process/thread by given slot.
  976.  
  977. ======================================================================
  978. ======== Function 18, subfunction 19 - get/set mouse features. =======
  979. ======================================================================
  980.  
  981. ---------------- Subsubfunction 0 - get mouse speed. -----------------
  982. Parameters:
  983.   * eax = 18 - function number
  984.   * ebx = 19 - subfunction number
  985.   * ecx = 0 - subsubfunction number
  986. Returned value:
  987.   * eax = current mouse speed
  988.  
  989. ---------------- Subsubfunction 1 - set mouse speed. -----------------
  990. Parameters:
  991.   * eax = 18 - function number
  992.   * ebx = 19 - subfunction number
  993.   * ecx = 1 - subsubfunction number
  994.   * edx = new value for speed
  995. Returned value:
  996.   * function does not return value
  997.  
  998. ---------------- Subsubfunction 2 - get mouse delay. -----------------
  999. Parameters:
  1000.   * eax = 18 - function number
  1001.   * ebx = 19 - subfunction number
  1002.   * ecx = 2 - subsubfunction number
  1003. Returned value:
  1004.   * eax = current mouse delay
  1005.  
  1006. ---------------- Subsubfunction 3 - set mouse delay. -----------------
  1007. Parameters:
  1008.   * eax = 18 - function number
  1009.   * ebx = 19 - subfunction number
  1010.   * ecx = 3 - subsubfunction number
  1011.   * edx = new value for mouse delay
  1012. Returned value:
  1013.   * function does not return value
  1014.  
  1015. ----------- Subsubfunction 4 - set mouse pointer position. -----------
  1016. Parameters:
  1017.   * eax = 18 - function number
  1018.   * ebx = 19 - subfunction number
  1019.   * ecx = 4 - subsubfunction number
  1020.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1021. Returned value:
  1022.   * function does not return value
  1023.  
  1024. -------- Subsubfunction 5 - simulate state of mouse buttons. ---------
  1025. Parameters:
  1026.   * eax = 18 - function number
  1027.   * ebx = 19 - subfunction number
  1028.   * ecx = 5 - subsubfunction number
  1029.   * edx = information about emulated state of mouse buttons:
  1030.     (same as return value in subfunction 2 of function 37)
  1031.     * bit 0 is set = left button is pressed
  1032.     * bit 1 is set = right button is pressed
  1033.     * bit 2 is set = middle button is pressed
  1034.     * bit 3 is set = 4th button is pressed
  1035.     * bit 4 is set = 5th button is pressed
  1036. Returned value:
  1037.   * function does not return value
  1038. Remarks:
  1039.   * It is recommended to set speed of the mouse (in subsubfunction 1)
  1040.     from 1 up to 9. The installed value is not inspected by the kernel
  1041.     code, so set it carefully, at incorrect value the cursor
  1042.     can "freeze". Speed of the mouse can be regulated through the
  1043.     application SETUP.
  1044.   * Recommended delay of the mouse (in subsubfunction 3) = 10. Lower
  1045.     value is not handled by COM mice. At the very large values the
  1046.     movement of the mouse on 1 pixel is impossible and the cursor will
  1047.     jump on the value of installed speed (subsubfunction 1). The
  1048.     installed value is not inspected by the kernel code.
  1049.     Mouse delay can be regulated through the application SETUP.
  1050.   * The subsubfunction 4 does not check the passed value. Before
  1051.     its call find out current screen resolution (with function 14)
  1052.     and check that the value of position is inside the limits of the
  1053.     screen.
  1054.  
  1055. ======================================================================
  1056. ======== Function 18, subfunction 20 - get information on RAM. =======
  1057. ======================================================================
  1058. Parameters:
  1059.   * eax = 18 - function number
  1060.   * ebx = 20 - subfunction number
  1061.   * ecx = pointer to the buffer for information (36 bytes)
  1062. Returned value:
  1063.   * eax = total size of existing RAM in pages
  1064.     or -1 if error has occured
  1065.   * buffer pointed to by ecx contains the following information:
  1066.     * +0:  dword: total size of existing RAM in pages
  1067.     * +4:  dword: size of free RAM in pages
  1068.     * +8:  dword: number of page faults (exceptions #PF)
  1069.                  in applications
  1070.     * +12: dword: size of kernel heap in bytes
  1071.     * +16: dword: free in kernel heap in bytes
  1072.     * +20: dword: total number of memory blocks in kernel heap
  1073.     * +24: dword: number of free memory blocks in kernel heap
  1074.     * +28: dword: size of maximum free block in kernel heap
  1075.                  (reserved)
  1076.     * +32: dword: size of maximum allocated block in kernel heap
  1077.                  (reserved)
  1078.  
  1079. ======================================================================
  1080. ===================== Function 18, subfunction 21 ====================
  1081. ======== Get slot number of process/thread by the identifier. ========
  1082. ======================================================================
  1083. Parameters:
  1084.   * eax = 18 - function number
  1085.   * ebx = 21 - subfunction number
  1086.   * ecx = identifer of process/thread (PID/TID)
  1087. Returned value:
  1088.   * eax = 0 - error (invalid identifier)
  1089.   * otherwise eax = slot number
  1090.  
  1091. ======================================================================
  1092. ===================== Function 18, subfunction 22 ====================
  1093. ============== Operations with window of another thread. =============
  1094. ======================================================================
  1095. Parameters:
  1096.   * eax = 18 - function number
  1097.   * ebx = 22 - subfunction number
  1098.   * ecx = operation type:
  1099.     * 0 = minimize window of the thread with given slot number
  1100.     * 1 = minimize window of the thread with given identifier
  1101.     * 2 = restore window of the thread with given slot number
  1102.     * 3 = restore window of the thread with given identifier
  1103.   * edx = parameter (slot number or PID/TID)
  1104. Returned value:
  1105.   * eax = 0 - success
  1106.   * eax = -1 - error (invalid identifier)
  1107. Remarks:
  1108.   * The thread can minimize its window with subfunction 10.
  1109.   * One can restore and activate window simultaneously with
  1110.     subfunction 3 (which requires slot number).
  1111.  
  1112. ======================================================================
  1113. ======== Function 18, subfunction 23 - minimize all windows. ==========
  1114. ======================================================================
  1115. Parameters:
  1116.   * eax = 18 - function number
  1117.   * ebx = 23 - subfunction number
  1118. Returned value:
  1119.   * eax = 0 - all windows have been minimized before a function call
  1120.   * eax = N - number of windows minimized from function
  1121. Remarks:
  1122.   * Window of special thread (name begin to symbol @) is not minimize.
  1123.  
  1124. ======================================================================
  1125. ======= Function 18, subfunction 24 - set limits of screen. ==========
  1126. ======================================================================
  1127. Parameters:
  1128.   * eax = 18 - function number
  1129.   * ebx = 24 - subfunction number
  1130.   * ecx = new X size
  1131.   * edx = new Y size
  1132. Returned value:
  1133.   * function does not return value
  1134. Remarks:
  1135.   * The function does not change the physical size of the video mode.
  1136.     It is designed for non-standard displays which display the image
  1137.     partially.
  1138.   * The sizes specified in the function should not exceed the sizes
  1139.     of the current video mode, otherwise the function will not change
  1140.     anything.
  1141.  
  1142. ======================================================================
  1143. ==================== Function 20 - MIDI interface. ===================
  1144. ======================================================================
  1145.  
  1146. ----------------------- Subfunction 1 - reset ------------------------
  1147. Parameters:
  1148.   * eax = 20 - function number
  1149.   * ebx = 1 - subfunction number
  1150.  
  1151. -------------------- Subfunction 2 - output byte ---------------------
  1152. Parameters:
  1153.   * eax = 20 - function number
  1154.   * ebx = 2 - subfunction number
  1155.   * cl = byte for output
  1156. Returned value (is the same for both subfunctions):
  1157.   * eax = 0 - success
  1158.   * eax = 1 - base port is not defined
  1159. Remarks:
  1160.   * Previously the base port must be defined by
  1161.     subfunction 1 of function 21.
  1162.  
  1163. ======================================================================
  1164. ======== Function 21, subfunction 1 - set MPU MIDI base port. ========
  1165. ======================================================================
  1166. Parameters:
  1167.   * eax = 21 - function number
  1168.   * ebx = 1 - subfunction number
  1169.   * ecx = number of base port
  1170. Returned value
  1171.   * eax = 0 - success
  1172.   * eax = -1 - erratic number of a port
  1173. Remarks:
  1174.   * Number of a port must satisfy to conditions 0x100<=ecx<=0xFFFF.
  1175.   * The installation of base is necessary for function 20.
  1176.   * To get base port use subfunction 1 of function 26.
  1177.  
  1178. ======================================================================
  1179. ========== Function 21, subfunction 2 - set keyboard layout. =========
  1180. ======================================================================
  1181. Keyboard layout is used to convert keyboard scancodes to ASCII-codes,
  1182. which will be read by function 2.
  1183. Parameters:
  1184.   * eax = 21 - function number
  1185.   * ebx = 2 - subfunction number
  1186.   * ecx = which layout to set:
  1187.     * 1 = normal layout
  1188.     * 2 = layout at pressed Shift
  1189.     * 3 = layout at pressed Alt
  1190.   * edx = pointer to layout - table of length 128 bytes
  1191. Or:
  1192.   * ecx = 9
  1193.   * dx = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1194. Returned value:
  1195.   * eax = 0 - success
  1196.   * eax = 1 - incorrect parameter
  1197. Remarks:
  1198.   * If Alt is pressed, the layout with Alt is used;
  1199.     if Alt is not pressed, but Shift is pressed,
  1200.     the layout with Shift is used;
  1201.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1202.     layout is used and then from the code is subtracted 0x60;
  1203.     if no control key is pressed, the normal layout is used.
  1204.   * To get layout and country identifier use
  1205.     subfunction 2 of function 26.
  1206.   * Country identifier is global system variable, which is not used
  1207.     by the kernel itself; however the application '@panel' displays
  1208.     the corresponding icon.
  1209.   * The application @panel switches layouts on user request.
  1210.  
  1211. ======================================================================
  1212. ============== Function 21, subfunction 3 - set CD base. =============
  1213. ======================================================================
  1214. Parameters:
  1215.   * eax = 21 - function number
  1216.   * ebx = 3 - subfunction number
  1217.   * ecx = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1218. Returned value:
  1219.   * eax = 0
  1220. Remarks:
  1221.   * CD base is used by function 24.
  1222.   * To get CD base use subfunction 3 of function 26.
  1223.  
  1224. ======================================================================
  1225. ========== Function 21, subfunction 5 - set system language. =========
  1226. ======================================================================
  1227. Parameters:
  1228.   * eax = 21 - function number
  1229.   * ebx = 5 - subfunction number
  1230.   * ecx = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1231. Returned value:
  1232.   * eax = 0
  1233. Remarks:
  1234.   * System language is global system variable and is not used
  1235.     by the kernel itself, however application @panel draws the
  1236.     appropriate icon.
  1237.   * Function does not check for correctness, as the kernel does not
  1238.     use this variable.
  1239.   * To get system language use subfunction 5 of function 26.
  1240.  
  1241. ======================================================================
  1242. ============== Function 21, subfunction 7 - set HD base. =============
  1243. ======================================================================
  1244. The HD base defines hard disk to write with usage of obsolete
  1245. syntax /HD in obsolete function 58; at usage of modern syntax
  1246. /HD0,/HD1,/HD2,/HD3 base is set automatically.
  1247. Parameters:
  1248.   * eax = 21 - function number
  1249.   * ebx = 7 - subfunction number
  1250.   * ecx = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1251. Returned value:
  1252.   * eax = 0
  1253. Remarks:
  1254.   * Any application at any time can change the base.
  1255.   * Do not change base, when any application works with hard disk.
  1256.     If you do not want system bugs.
  1257.   * To get HD base use subfunction 7 of function 26.
  1258.   * It is also necessary to define used partition of hard disk by
  1259.     subfunction 8.
  1260.  
  1261. ======================================================================
  1262. ========= Function 21, subfunction 8 - set used HD partition. ========
  1263. ======================================================================
  1264. The HD partition defines partition of the hard disk to write with
  1265. usage of obsolete syntax /HD and obsolete function 58;
  1266. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1267. base and partition are set automatically.
  1268. Parameters:
  1269.   * eax = 21 - function number
  1270.   * ebx = 8 - subfunction number
  1271.   * ecx = HD partition (beginning from 1)
  1272. Return value:
  1273.   * eax = 0
  1274. Remarks:
  1275.   * Any application at any time can change partition.
  1276.   * Do not change partition when any application works with hard disk.
  1277.     If you do not want system bugs.
  1278.   * To get used partition use subfunction 8 of function 26.
  1279.   * There is no correctness checks.
  1280.   * To get the number of partitions of a hard disk use
  1281.     subfunction 11 of function 18.
  1282.   * It is also necessary to define used HD base by subfunction 7.
  1283.  
  1284. ======================================================================
  1285.  Function 21, subfunction 11 - enable/disable low-level access to HD.
  1286. ======================================================================
  1287. Parameters:
  1288.   * eax = 21 - function number
  1289.   * ebx = 11 - subfunction number
  1290.   * ecx = 0/1 - disable/enable
  1291. Returned value:
  1292.   * eax = 0
  1293. Remarks:
  1294.   * Is used in LBA-read (subfunction 8 of function 58).
  1295.   * The current implementation uses only low bit of ecx.
  1296.   * To get current status use subfunction 11 of function 26.
  1297.  
  1298. ======================================================================
  1299.  Function 21, subfunction 12 - enable/disable low-level access to PCI.
  1300. ======================================================================
  1301. Parameters:
  1302.   * eax = 21 - function number
  1303.   * ebx = 12 - subfunction number
  1304.   * ecx = 0/1 - disable/enable
  1305. Returned value:
  1306.   * eax = 0
  1307. Remarks:
  1308.   * Is used in operations with PCI bus (function 62).
  1309.   * The current implementation uses only low bit of ecx.
  1310.   * To get current status use subfunction 12 of function 26.
  1311.  
  1312. ======================================================================
  1313. ============ Function 21, subfunction 13, subsubfunction 1 ===========
  1314. ======== Initialize + get information on the driver vmode.mdr. =======
  1315. ======================================================================
  1316. Parameters:
  1317.   * eax = 21 - function number
  1318.   * ebx = 13 - subfunction number
  1319.   * ecx = 1 - number of the driver function
  1320.   * edx = pointer to 512-bytes buffer
  1321. Returned value:
  1322.   * if driver is not loaded
  1323.     (never happens in the current implementation):
  1324.     * eax = -1
  1325.     * ebx, ecx destroyed
  1326.   * if driver is loaded:
  1327.     * eax = 'MDAZ' (in fasm style, that is 'M' - low byte, 'Z' - high)
  1328.       - signature
  1329.     * ebx = current frequency of the scanning (in Hz)
  1330.     * ecx destroyed
  1331.     * buffer pointed to by edx is filled
  1332. Format of the buffer:
  1333.   * +0: 32*byte: driver name, "Trans VideoDriver"
  1334.     (without quotes, supplemented by spaces)
  1335.   * +32 = +0x20: dword: driver version (version x.y is encoded as
  1336.     y*65536+x), for the current implementation is 1 (1.0)
  1337.   * +36 = +0x24: 7*dword: reserved (0 in the current implementation)
  1338.   * +64 = +0x40: 32*word: list of supported videomodes (each word
  1339.     is number of a videomode, after list itself there are zeroes)
  1340.   * +128 = +0x80: 32*(5*word): list of supported frequences of the
  1341.     scannings for videomodes: for each videomode listed in the
  1342.     previous field up to 5 supported frequences are given
  1343.     (unused positions contain zeroes)
  1344. Remarks:
  1345.   * Function initializes the driver (if it is not initialized yet)
  1346.     and must be called first, before others (otherwise they will do
  1347.     nothing and return -1).
  1348.   * The current implementation supports only one frequency
  1349.     of the scanning on videomode.
  1350.  
  1351. ======================================================================
  1352. ============ Function 21, subfunction 13, subsubfunction 2 ===========
  1353. ================ Get information on current videomode. ===============
  1354. ======================================================================
  1355. Parameters:
  1356.   * eax = 21 - function number
  1357.   * ebx = 13 - subfunction number
  1358.   * ecx = 2 - number of the driver function
  1359. Returned value:
  1360.   * eax = -1 - driver is not loaded or not initialized;
  1361.     ebx,ecx are destroyed
  1362.   * eax = [width]*65536 + [height]
  1363.   * ebx = frequency of the vertical scanning (in Hz)
  1364.   * ecx = number of current videomode
  1365. Remarks:
  1366.   * Driver must be initialized by call to
  1367.     driver function 1.
  1368.   * If only screen sizes are required, it is more expedient to use
  1369.     function 14 taking into account that it
  1370.     returns sizes on 1 less.
  1371.  
  1372. ======================================================================
  1373. === Function 21, subfunction 13, subsubfunction 3 - set videomode. ===
  1374. ======================================================================
  1375. Parameters:
  1376.   * eax = 21 - function number
  1377.   * ebx = 13 - subfunction number
  1378.   * ecx = 3 - number of the driver function
  1379.   * edx = [scanning frequency]*65536 + [videomode number]
  1380. Returned value:
  1381.   * eax = -1 - driver is not loaded, not initialized or
  1382.     an error has occured
  1383.   * eax = 0 - success
  1384.   * ebx, ecx destroyed
  1385. Remarks:
  1386.   * Driver must be initialized by driver function 1.
  1387.   * The videomode number and frequency must be in the table
  1388.     returned by driver function 1.
  1389.  
  1390. ======================================================================
  1391. ============ Function 21, subfunction 13, subsubfunction 4 ===========
  1392. ================== Return to the initial videomode. ==================
  1393. ======================================================================
  1394. Returns the screen to the videomode set at system boot.
  1395. Parameters:
  1396.   * eax = 21 - function number
  1397.   * ebx = 13 - subfunction number
  1398.   * ecx = 4 - number of the driver function
  1399. Returned value:
  1400.   * eax = -1 - driver is not loaded or not initialized
  1401.   * eax = 0 - success
  1402.   * ebx, ecx destroyed
  1403. Remarks:
  1404.   * Driver must be initialized by call to driver function 1.
  1405.  
  1406. ======================================================================
  1407. ============ Function 21, subfunction 13, subsubfunction 5 ===========
  1408. ===== Increase/decrease the size of the visible area of monitor. =====
  1409. ======================================================================
  1410. Parameters:
  1411.   * eax = 21 - function number
  1412.   * ebx = 13 - subfunction number
  1413.   * ecx = 5 - number of the driver function
  1414.   * edx = 0/1 - decrease/increase horizontal size on 1 position
  1415.   * edx = 2/3 - is not supported in the current implementation;
  1416.     is planned as decrease/increase vertical size on 1 position
  1417. Returned value:
  1418.   * eax = -1 - driver is not loaded or not initialized
  1419.   * eax = 0 - success
  1420.   * ebx, ecx destroyed
  1421. Remarks:
  1422.   * Driver must be initialized by call to driver function 1.
  1423.   * Function influences only the physical size of the screen image;
  1424.     the logical size (number of pixels) does not change.
  1425.  
  1426. ======================================================================
  1427. ================= Function 22 - set system date/time. ================
  1428. ======================================================================
  1429. Parameters:
  1430.   * eax = 22 - function number
  1431.   * ebx = 0 - set time
  1432.     * ecx = 0x00SSMMHH - time in the binary-decimal code (BCD):
  1433.     * HH=hour 00..23
  1434.     * MM=minute 00..59
  1435.     * SS=second 00..59
  1436.   * ebx = 1 - set date
  1437.     * ecx = 0x00DDMMYY - date in the binary-decimal code (BCD):
  1438.     * DD=day 01..31
  1439.     * MM=month 01..12
  1440.     * YY=year 00..99
  1441.   * ebx = 2 - set day of week
  1442.     * ecx = 1 for Sunday, ..., 7 for Saturday
  1443.   * ebx = 3 - set alarm clock
  1444.     * ecx = 0x00SSMMHH
  1445. Returned value:
  1446.   * eax = 0 - success
  1447.   * eax = 1 - incorrect parameter
  1448.   * eax = 2 - CMOS-battery was unloaded
  1449. Remarks:
  1450.   * Value of installation of day of week seems to be doubtful,
  1451.     as it a little where is used
  1452.     (day of week can be calculated by date).
  1453.   * Alarm clock can be set on operation in the given time every day.
  1454.     But there is no existing system function to disable it.
  1455.   * Operation of alarm clock consists in generation IRQ8.
  1456.   * Generally CMOS supports for alarm clock set of value 0xFF
  1457.     as one of parameters and it means that the appropriate parameter
  1458.     is ignored. But current implementation does not allow this
  1459.     (will return 1).
  1460.   * Alarm clock is a global system resource; the set of
  1461.     an alarm clock cancels automatically the previous set.
  1462.     However, at moment no program uses it.
  1463.  
  1464. ======================================================================
  1465. ============= Function 23 - wait for event with timeout. =============
  1466. ======================================================================
  1467. If the message queue is empty, waits for new message in the queue,
  1468. but no more than given time. Then reads out a message from the queue.
  1469.  
  1470. Parameters:
  1471.   * eax = 23 - function number
  1472.   * ebx = timeout (in 1/100 of second)
  1473. Returned value:
  1474.   * eax = 0 - the message queue is empty
  1475.   * otherwise eax = event (see the list of events)
  1476. Remarks:
  1477.   * Only those events are taken into account, which enter into
  1478.     the mask set by function 40. By default it is
  1479.     redraw, key and button events.
  1480.   * To check for presence of a message in the queue use function 11.
  1481.     To wait without timeout use function 10.
  1482.   * Transmission ebx=0 results in immediate returning eax=0.
  1483.   * Current implementation returns immediately with eax=0,
  1484.     if the addition of ebx with the current value of time counter
  1485.     makes 32-bit overflow.
  1486.  
  1487. ======================================================================
  1488. ======== Function 24, subfunction 1 - begin to play CD-audio. ========
  1489. ======================================================================
  1490. Parameters:
  1491.   * eax = 24 - function number
  1492.   * ebx = 1 - subfunction number
  1493.   * ecx = 0x00FRSSMM, where
  1494.     * MM = starting minute
  1495.     * SS = starting second
  1496.     * FR = starting frame
  1497. Returned value:
  1498.   * eax = 0 - success
  1499.   * eax = 1 - CD base is not defined
  1500. Remarks:
  1501.   * Previously CD base must be defined by the call to
  1502.     subfunction 3 of function 21.
  1503.   * One second includes 75 frames, one minute includes 60 seconds.
  1504.   * The function is asynchronous (returns control, when play begins).
  1505.  
  1506. ======================================================================
  1507. ======= Function 24, subfunction 2 - get information on tracks. ======
  1508. ======================================================================
  1509. Parameters:
  1510.   * eax = 24 - function number
  1511.   * ebx = 2 - subfunction number
  1512.   * ecx = pointer to the buffer for the table
  1513.     (maximum 8*64h+4 bytes=100 tracks)
  1514. Returned value:
  1515.   * eax = 0 - success
  1516.   * eax = 1 - CD base is not defined
  1517. Remarks:
  1518.   * The format of the table with tracks information is the same as
  1519.     for ATAPI-CD command 43h (READ TOC), usual table (subcommand 00h).
  1520.     Function returns addresses in MSF.
  1521.   * Previously CD base port must be set by call to
  1522.     subfunction 3 of function 21.
  1523.   * Function returns information only about no more than 100
  1524.     first tracks. In most cases it is enough.
  1525.  
  1526. ======================================================================
  1527. ========== Function 24, subfunction 3 - stop play CD-audio. ==========
  1528. ======================================================================
  1529. Parameters:
  1530.   * eax = 24 - function number
  1531.   * ebx = 1 - subfunction number
  1532. Returned value:
  1533.   * eax = 0 - success
  1534.   * eax = 1 - CD base is not defined
  1535. Remarks:
  1536.   * Previously CD base port must be defined by call to
  1537.     subfunction 3 of function 21.
  1538.  
  1539. ======================================================================
  1540. ======= Function 24, subfunction 4 - eject tray of disk drive. =======
  1541. ======================================================================
  1542. Parameters:
  1543.   * eax = 24 - function number
  1544.   * ebx = 4 - subfunction number
  1545.   * ecx = position of CD/DVD-drive
  1546.       (from 0=Primary Master to 3=Secondary Slave)
  1547. Returned value:
  1548.   * function does not return value
  1549. Remarks:
  1550.   * The function is supported only for ATAPI devices (CD and DVD).
  1551.   * When the tray is being ejected,
  1552.     manual control of tray is unlocked.
  1553.   * When the tray is being ejected, the code clears the cache for
  1554.     corresponding device.
  1555.   * An example of usage of the function is the application CD_tray.
  1556.  
  1557. ======================================================================
  1558. ======== Function 24, subfunction 5 - load tray of disk drive. =======
  1559. ======================================================================
  1560. Parameters:
  1561.   * eax = 24 - function number
  1562.   * ebx = 5 - subfunction number
  1563.   * ecx = position of CD/DVD-drive
  1564.       (from 0=Primary Master to 3=Secondary Slave)
  1565. Returned value:
  1566.   * function does not return value
  1567. Remarks:
  1568.   * The function is supported only for ATAPI devices (CD and DVD).
  1569.   * An example of usage of the function is the application CD_tray.
  1570.  
  1571. ======================================================================
  1572. ======= Function 25 - put image area on the background layer. ========
  1573. ======================================================================
  1574. Paramters:
  1575.   * eax = 25 - function number
  1576.   * ebx = pointer to the previously allocated memory area,
  1577.         where placed the source images in a format BBGGRRTTBBGGRRTT...
  1578.   * ecx = [size on axis x]*65536 + [size on axis y]
  1579.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1580. Returned value:
  1581.   * function does not return value
  1582. Remarks:
  1583.   * Coordinates of the image are coordinates of the upper left corner
  1584.     of the image relative to the screen.
  1585.   * Size of the image in bytes is 4*xsize*ysize
  1586.   * TT - byte pointer of transparency, at current version:
  1587.          1 to FF - opaque, 0 - transparent.
  1588.   * The function places the image directly to LFB. It is not for
  1589.     background image f.15. Options f.15 to f.25 does not make sense.
  1590.  
  1591. ======================================================================
  1592. ======== Function 26, subfunction 1 - get MPU MIDI base port. ========
  1593. ======================================================================
  1594. Parameters:
  1595.   * eax = 26 - function number
  1596.   * ebx = 1 - subfunction number
  1597. Returned value:
  1598.   * eax = port number
  1599. Parameters:
  1600.   * To set base port use subfunction 1 of function 21.
  1601.  
  1602. ======================================================================
  1603. ========== Function 26, subfunction 2 - get keyboard layout. =========
  1604. ======================================================================
  1605. The keyboard layout is used to convert keyboard scancodes to
  1606. ASCII-codes for function 2.
  1607. Parameters:
  1608.   * eax = 26 - function number
  1609.   * ebx = 2 - subfunction number
  1610.   * ecx = what layout to get:
  1611.     * 1 = normal layout
  1612.     * 2 = layout with pressed Shift
  1613.     * 3 = layout with pressed Alt
  1614.   * edx = pointer to the 128-bytes buffer, where the layout will be
  1615.     copied
  1616. Returned value:
  1617.   * function does not return value
  1618. Or:
  1619.   * eax = 26 - function number
  1620.   * ebx = 2 - subfunction number
  1621.   * ecx = 9
  1622. Returned value:
  1623.   * eax = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1624. Remarks:
  1625.   * If Alt is pressed, the layout with Alt is used;
  1626.     if Alt is not pressed, but Shift is pressed,
  1627.     the layout with Shift is used;
  1628.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1629.     layout is used and then from the code is subtracted 0x60;
  1630.     if no control key is pressed, the normal layout is used.
  1631.   * To set layout and country identifier use
  1632.     subfunction 2 of function 21.
  1633.   * Country identifier is global system variable, which is not used
  1634.     by the kernel itself; however the application '@panel' displays
  1635.     the corresponding icon (using this function).
  1636.   * The application @panel switches layouts on user request.
  1637.  
  1638. ======================================================================
  1639. ============== Function 26, subfunction 3 - get CD base. =============
  1640. ======================================================================
  1641. Parameters:
  1642.   * eax = 26 - function number
  1643.   * ebx = 3 - subfunction number
  1644. Returned value:
  1645.   * eax = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1646. Remarks:
  1647.   * CD base is used by function 24.
  1648.   * To set CD base use subfunction 3 of function 21.
  1649.  
  1650. ======================================================================
  1651. ========== Function 26, subfunction 5 - get system language. =========
  1652. ======================================================================
  1653. Parameters:
  1654.   * eax = 26 - function number
  1655.   * ebx = 5 - subfunction number
  1656. Returned value:
  1657.   * eax = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1658. Remarks:
  1659.   * System language is global system variable and is not used
  1660.     by the kernel itself, however application @panel draws the
  1661.     appropriate icon (using this function).
  1662.   * To set system language use subfunction 5 of function 21.
  1663.  
  1664. ======================================================================
  1665. ============== Function 26, subfunction 7 - get HD base. =============
  1666. ======================================================================
  1667. The HD base defines hard disk to write with usage of obsolete
  1668. syntax /HD in obsolete function 58; at usage of modern syntax
  1669. /HD0,/HD1,/HD2,/HD3 base is set automatically.
  1670. Parameters:
  1671.   * eax = 26 - function number
  1672.   * ebx = 7 - subfunction number
  1673. Returned value:
  1674.   * eax = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1675. Remarks:
  1676.   * Any application in any time can change HD base.
  1677.   * To set base use subfunction 7 of function 21.
  1678.   * To get used partition of hard disk use subfunction 8.
  1679.  
  1680. ======================================================================
  1681. ========= Function 26, subfunction 8 - get used HD partition. ========
  1682. ======================================================================
  1683. The HD partition defines partition of the hard disk to write with
  1684. usage of obsolete syntax /HD in obsolete function 58;
  1685. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1686. base and partition are set automatically.
  1687. Parameters:
  1688.   * eax = 26 - function number
  1689.   * ebx = 8 - subfunction number
  1690. Returned value:
  1691.   * eax = HD partition (beginning from 1)
  1692. Remarks:
  1693.   * Any application in any time can change partition.
  1694.   * To set partition use subfunction 8 of function 21.
  1695.   * To get number of partitions on a hard disk use
  1696.     subfunction 11 of function 18.
  1697.   * To get base of used hard disk, use subfunction 7.
  1698.  
  1699. ======================================================================
  1700. === Function 26, subfunction 9 - get the value of the time counter. ==
  1701. ======================================================================
  1702. Parameters:
  1703.   * eax = 26 - function number
  1704.   * ebx = 9 - subfunction number
  1705. Returned value:
  1706.   * eax = number of 1/100s of second, past from the system boot time
  1707. Remarks:
  1708.   * Counter takes modulo 2^32, that correspond to a little more
  1709.     than 497 days.
  1710.   * To get system time use function 3.
  1711.  
  1712. ======================================================================
  1713. ===================== Function 26, subfunction 11 ====================
  1714. ========== Find out whether low-level HD access is enabled. ==========
  1715. ======================================================================
  1716. Parameters:
  1717.   * eax = 26 - function number
  1718.   * ebx = 11 - subfunction number
  1719. Returned value:
  1720.   * eax = 0/1 - disabled/enabled
  1721. Remarks:
  1722.   * Is used in LBA read (subfunction 8 of function 58).
  1723.   * To set current state use subfunction 11 of function 21.
  1724.  
  1725. ======================================================================
  1726. ===================== Function 26, subfunction 12 ====================
  1727. ========== Find out whether low-level PCI access is enabled. =========
  1728. ======================================================================
  1729. Parameters:
  1730.   * eax = 26 - function number
  1731.   * ebx = 12 - subfunction number
  1732. Returned value:
  1733.   * eax = 0/1 - disabled/enabled
  1734. Remarks:
  1735.   * Is used by operations with PCI bus (function 62).
  1736.   * The current implementation uses only low bit of ecx.
  1737.   * To set the current state use subfunction 12 of function 21.
  1738.  
  1739. ======================================================================
  1740. =================== Function 29 - get system date. ===================
  1741. ======================================================================
  1742. Parameters:
  1743.   * eax = 29 - function number
  1744. Returned value:
  1745.   * eax = 0x00DDMMYY, where
  1746.     (binary-decimal coding, BCD, is used)
  1747.   * YY = two low digits of year (00..99)
  1748.   * MM = month (01..12)
  1749.   * DD = day (01..31)
  1750. Remarks:
  1751.   * To set system date use function 22.
  1752.  
  1753. ======================================================================
  1754. ============= Function 30 - work with the current folder. ============
  1755. ======================================================================
  1756.  
  1757. --------- Subfunction 1 - set current folder for the thread. ---------
  1758. Parameters:
  1759.   * eax = 30 - function number
  1760.   * ebx = 1 - subfunction number
  1761.   * ecx = pointer to ASCIIZ-string with the path to new current folder
  1762. Returned value:
  1763.   * function does not return value
  1764.  
  1765. --------- Subfunction 2 - get current folder for the thread. ---------
  1766. Parameters:
  1767.   * eax = 30 - function number
  1768.   * ebx = 2 - subfunction number
  1769.   * ecx = pointer to buffer
  1770.   * edx = size of buffer
  1771. Returned value:
  1772.   * eax = size of the current folder's name (including terminating 0)
  1773. Remarks:
  1774.   * If the buffer is too small to hold all data, only first (edx-1)
  1775.     bytes are copied and than terminating 0 is inserted.
  1776.   * By default, current folder for the thread is "/rd/1".
  1777.   * At process/thread creation the current folder will be inherited
  1778.     from the parent.
  1779.  
  1780. --- Subfunction 3 - install the add.system directory for the kernel --
  1781. Parameters:
  1782.   * eax = 30 - function number
  1783.   * ebx = 3 - subfunction number
  1784.   * ecx = pointer to a block of data:
  1785.           sysdir_name     rb 64
  1786.           sysdir_path     rb 64
  1787. For example:
  1788. dir_name1       db 'KolibriOS',0
  1789.                 rb 64-10
  1790. dir_path1       db 'HD0/1',0
  1791.                 rb 64-6
  1792. Returned value:
  1793.   * function does not return value
  1794. Remarks:
  1795.   * The function can be called only 1 time for 1 session of the OS.
  1796.  
  1797. ======================================================================
  1798. ========= Function 34 - who owner the pixel on the screen. ===========
  1799. ======================================================================
  1800. Parameters:
  1801.   * eax = 34 - function number
  1802.   * ebx = x-coordinate (relative to the display)
  1803.   * ecx = y-coordinate (relative to the display)
  1804.  
  1805. Returned value:
  1806.   * eax = 0x000000XX - owner of pixel the slot window N
  1807.     If incorrect values ebx and ecx then function returns 0
  1808.   * The function takes the value from the area [_WinMapAddress]
  1809.  
  1810. ======================================================================
  1811. ======= Function 35 - read the color of a pixel on the screen. =======
  1812. ======================================================================
  1813. Parameters:
  1814.   * eax = 35
  1815.   * ebx = y*xsize+x, where
  1816.   * (x,y) = coordinates of a pixel (beginning from 0)
  1817.   * xsize = horizontal screen size
  1818. Returned value:
  1819.   * eax = color 0x00RRGGBB
  1820. Remarks:
  1821.   * To get screen sizes use function 14. Pay attention,
  1822.     that it subtracts 1 from both sizes.
  1823.   * There is also direct access (without any system calls)
  1824.     to videomemory through the selector gs. To get parameters of
  1825.     the current videomode, use function 61.
  1826.  
  1827. ======================================================================
  1828. =================== Function 36 - read screen area. ==================
  1829. ======================================================================
  1830. Paramters:
  1831.   * eax = 36 - function number
  1832.   * ebx = pointer to the previously allocated memory area,
  1833.         where will be placed the image in the format BBGGRRBBGGRR...
  1834.   * ecx = [size on axis x]*65536 + [size on axis y]
  1835.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1836. Returned value:
  1837.   * function does not return value
  1838. Remarks:
  1839.   * Coordinates of the image are coordinates of the upper left corner
  1840.     of the image relative to the screen.
  1841.   * Size of the image in bytes is 3*xsize*ysize.
  1842.  
  1843. ======================================================================
  1844. =================== Function 37 - work with mouse. ===================
  1845. ======================================================================
  1846.  
  1847. ---------- Subfunction 0 - screen coordinates of the mouse -----------
  1848. Parameters:
  1849.   * eax = 37 - function number
  1850.   * ebx = 0 - subfunction number
  1851. Returned value:
  1852.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1853.     (beginning from 0)
  1854.  
  1855. -- Subfunction 1 - coordinates of the mouse relative to the window ---
  1856. Parameters:
  1857.   * eax = 37 - function number
  1858.   * ebx = 1 - subfunction number
  1859. Returned value:
  1860.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1861.     relative to the application window (beginning from 0)
  1862. Remarks:
  1863.   * The value is calculated by formula (x-xwnd)*65536 + (y-ywnd).
  1864.     If y>=ywnd, the low word is non-negative and contains
  1865.     relative y-coordinate, and the high word - relative x-coordinate
  1866.     (with correct sign). Otherwise the low word is negative and still
  1867.     contains relative y-coordinate, and to the high word
  1868.     1 should be added.
  1869.  
  1870. ------------ Subfunction 2 - pressed buttons of the mouse ------------
  1871. Parameters:
  1872.   * eax = 37 - function number
  1873.   * ebx = 2 - subfunction number
  1874. Returned value:
  1875.   * eax contains information on the pressed mouse buttons:
  1876.   * bit 0 is set = left button is pressed
  1877.   * bit 1 is set = right button is pressed
  1878.   * bit 2 is set = middle button is pressed
  1879.   * bit 3 is set = 4th button is pressed
  1880.   * bit 4 is set = 5th button is pressed
  1881.   * other bits are cleared
  1882.  
  1883. -------------------- Subfunction 4 - load cursor ---------------------
  1884. Parameters:
  1885.   * eax = 37 - function number
  1886.   * ebx = 4 - subfunction number
  1887.   * dx = data source:
  1888.   * dx = LOAD_FROM_FILE = 0 - data in a file
  1889.     * ecx = pointer to full path to the cursor file
  1890.     * the file must be in the format .cur, which is standard for
  1891.       MS Windows, at that of the size 32*32 pixels
  1892.   * dx = LOAD_FROM_MEM = 1 - data of file are already loaded in memory
  1893.     * ecx = pointer to data of the cursor file
  1894.     * the data format is the same as in the previous case
  1895.   * dx = LOAD_INDIRECT = 2 - data in memory
  1896.     * ecx = pointer to cursor image in the format ARGB 32*32 pixels
  1897.     * edx = 0xXXYY0002, where
  1898.       * XX = x-coordinate of cursor hotspot
  1899.       * YY = y-coordinate
  1900.       * 0 <= XX, YY <= 31
  1901. Returned value:
  1902.   * eax = 0 - failed
  1903.   * otherwise eax = cursor handle
  1904.  
  1905. --------------------- Subfunction 5 - set cursor ---------------------
  1906. Sets new cursor for the window of the current thread.
  1907. Parameters:
  1908.   * eax = 37 - function number
  1909.   * ebx = 5 - subfunction number
  1910.   * ecx = cursor handle
  1911. Returned value:
  1912.   * eax = handle of previous cursor
  1913. Remarks:
  1914.   * If the handle is incorrect, the function restores the default
  1915.     cursor (standard arrow). In particular, ecx=0 restores it.
  1916.  
  1917. ------------------- Subfunction 6 - delete cursor --------------------
  1918. Parameters:
  1919.   * eax = 37 - function number
  1920.   * ebx = 6 - subfunction number
  1921.   * ecx = cursor handle
  1922. Returned value:
  1923.   * eax destroyed
  1924. Remarks:
  1925.   * The cursor must be loaded previously by the current thread
  1926.     (with the call to subfunction 4). The function does not delete
  1927.     system cursors and cursors, loaded by another applications.
  1928.   * If the active cursor (set by subfunction 5) is deleted,
  1929.     the system restores the default cursor (standard arrow).
  1930.  
  1931. ------------------ Subfunction 7 - get scroll data -------------------
  1932. Parameters:
  1933.   * eax = 37 - function number
  1934.   * ebx = 7 - subfunction number
  1935. Returned value:
  1936.   * eax = [horizontal offset]*65536 + [vertical offset]
  1937. Remarks:
  1938.   * Scroll data is available for active window only.
  1939.   * Values are zeroed after reading.
  1940.   * Values are signed.
  1941.  
  1942. ======================================================================
  1943. ====================== Function 38 - draw line. ======================
  1944. ======================================================================
  1945. Parameters:
  1946.   * eax = 38 - function number
  1947.   * ebx = [start coordinate on axis x]*65536 +
  1948.               [end coordinate on axis x]
  1949.   * ecx = [start coordinate on axis y]*65536 +
  1950.               [end coordinate on axis y]
  1951.   * edx = 0x00RRGGBB - color
  1952.     edx = 0x01xxxxxx - draw inversed line
  1953.           (low 24 bits are ignored)
  1954. Returned value:
  1955.   * function does not return value
  1956. Remarks:
  1957.   * Coordinates are relative to the window.
  1958.   * End point is also drawn.
  1959.  
  1960. ======================================================================
  1961. == Function 39, subfunction 1 - get a size of the background image. ==
  1962. ======================================================================
  1963. Parameters:
  1964.   * eax = 39 - function number
  1965.   * ebx = 1 - subfunction number
  1966. Returned value:
  1967.   * eax = [width]*65536 + [height]
  1968. Remarks:
  1969.   * There is a pair function to set sizes of background image -
  1970.     subfunction 1 of function 15. After which it is necessary,
  1971.     of course, anew to define image.
  1972.  
  1973. ======================================================================
  1974. == Function 39, subfunction 2 - get pixel from the background image. =
  1975. ======================================================================
  1976. Parameters:
  1977.   * eax = 39 - function number
  1978.   * ebx = 2 - subfunction number
  1979.   * ecx = offset
  1980. Returned value:
  1981.   * eax = 0x00RRGGBB - pixel color, if offset is valid
  1982.     (less than 0x160000-16)
  1983.   * eax = 2 otherwise
  1984. Remarks:
  1985.   * Do not rely on returned value for invalid offsets, it may be
  1986.     changed in future kernel versions.
  1987.   * Offset for pixel with coordinates (x,y)
  1988.     is calculated as (x+y*xsize)*3.
  1989.   * There is a pair function to set pixel on the background image -
  1990.     subfunction 2 of function 15.
  1991.  
  1992. ======================================================================
  1993. == Function 39, subfunction 4 - get drawing mode for the background. =
  1994. ======================================================================
  1995. Parameters:
  1996.   * eax = 39 - function number
  1997.   * ebx = 4 - subfunction number
  1998. Returned value:
  1999.   * eax = 1 - tile
  2000.   * eax = 2 - stretch
  2001. Remarks:
  2002.   * There is a pair function to set drawing mode -
  2003.     subfunction 4 of function 15.
  2004.  
  2005. ======================================================================
  2006. =========== Function 40 - set the mask for expected events. ==========
  2007. ======================================================================
  2008. The mask for expected events affects function working with events
  2009. 10, 11, 23 - they notify only about events allowed by this mask.
  2010. Parameters:
  2011.   * eax = 40 - function number
  2012.   * ebx = mask: bit i corresponds to event i+1 (see list of events)
  2013.     (set bit permits notice on event)
  2014.     bit 31: mouse active/inactive filter
  2015.     bit 31 = 0 - inactive window receive mouse events
  2016.     bit 31 = 1 - inactive window does not receive mouse events
  2017.     bit 30: cursor position filter
  2018.     bit 30 = 0 = the window receive mouse events if cursor
  2019.                  outside window
  2020.     bit 30 = 1 - the window does not receive mouse events if cursor
  2021.                  outside window
  2022. Returned value:
  2023.   * eax = previous value of mask
  2024. Remarks:
  2025.   * Default mask (7=111b) enables nofices about redraw,
  2026.     keys and buttons. This is enough for many applications.
  2027.   * Events prohibited in the mask are saved anyway, when come;
  2028.     they are simply not informed with event functions.
  2029.   * Event functions take into account the mask on moment of
  2030.     function call, not on moment of event arrival.
  2031.  
  2032.  
  2033. ======================================================================
  2034. ================ Function 43 - input/output to a port. ===============
  2035. ======================================================================
  2036.  
  2037. ------------------------ Output data to port -------------------------
  2038. Parameters:
  2039.   * eax = 43 - function number
  2040.   * bl = byte for output
  2041.   * ecx = port number 0xnnnn (from 0 to 0xFFFF)
  2042. Returned value:
  2043.   * eax = 0 - success
  2044.   * eax = 1 - the thread has not reserved the selected port
  2045.  
  2046. ------------------------ Input data from port ------------------------
  2047. Parameters:
  2048.   * eax = 43 - function number
  2049.   * ebx is ignored
  2050.   * ecx = 0x8000nnnn, where nnnn = port number (from 0 to 0xFFFF)
  2051. Returned value:
  2052.   * eax = 0 - success, thus ebx = entered byte
  2053.   * eax = 1 - the thread has not reserved the selected port
  2054. Remarks:
  2055.   * Previously the thread must reserve the selected port
  2056.     for itself by function 46.
  2057.   * Instead of call to this function it is better to use
  2058.     processor instructions in/out - this is much
  2059.     faster and a bit shorter and easier.
  2060.  
  2061.  
  2062. ======================================================================
  2063. ====== Function 46 - reserve/free a group of input/output ports. =====
  2064. ======================================================================
  2065. To work with reserved ports an application can access directly by
  2066. commands in/out (recommended way) and can use function 43
  2067. (not recommended way).
  2068. Parameters:
  2069.   * eax = 46 - function number
  2070.   * ebx = 0 - reserve, 1 - free
  2071.   * ecx = start port number
  2072.   * edx = end port number (inclusive)
  2073. Returned value:
  2074.   * eax = 0 - success
  2075.   * eax = 1 - error
  2076. Remarks:
  2077.   * For ports reservation: an error occurs if and only if
  2078.     one from the following condition satisfies:
  2079.     * start port is more than end port;
  2080.     * the selected range contains incorrect port number
  2081.       (correct are from 0 to 0xFFFF);
  2082.     * limit for the total number of reserved areas is exceeded
  2083.       (maximum 255 are allowed);
  2084.     * the selected range intersects with any of earlier reserved
  2085.   * For ports free: an error is an attempt to free range,
  2086.     that was not earlier reserved by this function
  2087.     (with same ecx,edx).
  2088.   * If an error occurs (for both cases) function performs no action.
  2089.   * At booting the system reserves for itself ports
  2090.     0..0x2d, 0x30..0x4d, 0x50..0xdf, 0xe5..0xff (inclusively).
  2091.   * When a thread terminates, all reserved by it ports
  2092.     are freed automatically.
  2093.  
  2094. ======================================================================
  2095. ============= Function 47 - draw a number in the window. =============
  2096. ======================================================================
  2097. Parameters:
  2098.   * eax = 47 - function number
  2099.   * ebx = parameters of conversion number to text:
  2100.     * bl = 0 - ecx contains number
  2101.     * bl = 1 - ecx contains pointer to dword/qword-number
  2102.     * bh = 0 - display in decimal number system
  2103.     * bh = 1 - display in hexadecimal system
  2104.     * bh = 2 - display in binary system
  2105.     * bits 16-21 = how many digits to display
  2106.     * bits 22-29 reserved and must be set to 0
  2107.     * bit 30 set = display qword (64-bit) number (must be bl=1)
  2108.     * bit 31 set = do not display leading zeroes of the number
  2109.   * ecx = number (if bl=0) or pointer (if bl=1)
  2110.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  2111.   * esi = 0xX0RRGGBB:
  2112.     * RR, GG, BB specify the color
  2113.     * X = ABnn (bits)
  2114.     * nn = font (0/1)
  2115.     * A is ignored
  2116.     * B=1 - fill background with the color edi
  2117. Returned value:
  2118.   * function does not return value
  2119. Remarks:
  2120.   * The given length must not exceed 60.
  2121.   * The exactly given amount of digits is output. If number is small
  2122.     and can be written by smaller amount of digits, it is supplemented
  2123.     by leading zeroes; if the number is big and can not be written by
  2124.     given amount of digits, extra digits are not drawn.
  2125.   * Parameters of fonts are shown in the description of function 4
  2126.     (text output).
  2127.  
  2128. ======================================================================
  2129. ========= Function 48, subfunction 0 - apply screen settings. ========
  2130. ======================================================================
  2131. Parameters:
  2132.   * eax = 48 - function number
  2133.   * ebx = 0 - subfunction number
  2134.   * ecx = 0 - reserved
  2135. Returned value:
  2136.   * function does not return value
  2137. Remarks:
  2138.   * Function redraws the screen after parameters change by
  2139.     subfunctions 1 and 2.
  2140.   * Function call without prior call to one of indicated subfunctions
  2141.     is ignored.
  2142.   * Function call with nonzero ecx is ignored.
  2143.  
  2144. ======================================================================
  2145. =========== Function 48, subfunction 1 - set button style. ===========
  2146. ======================================================================
  2147. Parameters:
  2148.   * eax = 48 - function number
  2149.   * ebx = 1 - subfunction number
  2150.   * ecx = button style:
  2151.     * 0 = flat
  2152.     * 1 = 3d
  2153. Returned value:
  2154.   * function does not return value
  2155. Remarks:
  2156.   * After call to this function one should redraw the screen by
  2157.     subfunction 0.
  2158.   * Button style influences only to their draw of function 8.
  2159.  
  2160. ======================================================================
  2161. ====== Function 48, subfunction 2 - set standard window colors. ======
  2162. ======================================================================
  2163. Parameters:
  2164.   * eax = 48 - function number
  2165.   * ebx = 2 - subfunction number
  2166.   * ecx = pointer to the color table
  2167.   * edx = size of the color table
  2168.     (must be 40 bytes for future compatibility)
  2169. Format of the color table is shown in description of subfunction 3.
  2170. Returned value:
  2171.   * function does not return value
  2172. Remarks:
  2173.   * After call to this function one should redraw the screen by
  2174.     subfunction 0.
  2175.   * Table of standard colors influences only to applications,
  2176.     which receive this table obviously (by subfunction 3)
  2177.     and use it (specifying colors from it to drawing functions).
  2178.   * Table of standard colors is included in skin and is installed
  2179.     anew with skin installation (by subfunction 8).
  2180.   * Color table can be viewed/changed interactively with
  2181.     the application 'desktop'.
  2182.  
  2183. ======================================================================
  2184. ====== Function 48, subfunction 3 - get standard window colors. ======
  2185. ======================================================================
  2186. Parameters:
  2187.   * eax = 48 - function number
  2188.   * ebx = 3 - subfunction number
  2189.   * ecx = pointer to the buffer with size edx bytes,
  2190.     where table will be written
  2191.   * edx = size of color table
  2192.     (must be 40 bytes for future compatibility)
  2193. Returned value:
  2194.   * function does not return value
  2195. Format of the color table:
  2196. each item is dword-value for color 0x00RRGGBB
  2197.   * +0: dword: frames - color of frame
  2198.   * +4: dword: grab - color of header
  2199.   * +8: dword: grab_button - color of button on header bar
  2200.   * +12 = +0xC: dword: grab_button_text - color of text on button
  2201.     on header bar
  2202.   * +16 = +0x10: dword: grab_text - color of text on header
  2203.   * +20 = +0x14: dword: work - color of working area
  2204.   * +24 = +0x18: dword: work_button - color of button in working area
  2205.   * +28 = +0x1C: dword: work_button_text - color of text on button
  2206.     in working area
  2207.   * +32 = +0x20: dword: work_text - color of text in working area
  2208.   * +36 = +0x24: dword: work_graph - color of graphics in working area
  2209. Remarks:
  2210.   * Structure of the color table is described in the standard
  2211.     include file 'macros.inc' as 'system_colors'; for example,
  2212.     it is possible to write:
  2213.         sc      system_colors           ; variable declaration
  2214.         ...                             ; somewhere one must call
  2215.                                         ; this function with ecx=sc
  2216.         mov     ecx, [sc.work_button_text]      ; read text color on
  2217.                                         ; buttin in working area
  2218.   * A program itself desides to use or not to use color table.
  2219.     For usage program must simply at calls to drawing functions select
  2220.     color taken from the table.
  2221.   * At change of the table of standard colors (by subfunction 2 with
  2222.     the subsequent application of changes by subfunction 0 or
  2223.     at skin set by subfunction 8) the system sends to all windows
  2224.     redraw message (the event with code 1).
  2225.   * Color table can be viewed/changed interactively with
  2226.     the application 'desktop'.
  2227.  
  2228. ======================================================================
  2229. ============ Function 48, subfunction 4 - get skin height. ===========
  2230. ======================================================================
  2231. Parameters:
  2232.   * eax = 48 - function number
  2233.   * ebx = 4 - subfunction number
  2234. Returned value:
  2235.   * eax = skin height
  2236. Remarks:
  2237.   * Skin height is defined as the height of a header
  2238.     of skinned windows.
  2239.   * See also general structure of window in the description
  2240.     of function 0.
  2241.  
  2242. ======================================================================
  2243. ======== Function 48, subfunction 5 - get screen working area. =======
  2244. ======================================================================
  2245. Parameters:
  2246.   * eax = 48 - function number
  2247.   * ebx = 5 - subfunction number
  2248. Returned value:
  2249.   * eax = [left]*65536 + [right]
  2250.   * ebx = [top]*65536 + [bottom]
  2251. Remarks:
  2252.   * The screen working area defines position and coordinates of
  2253.     a maximized window.
  2254.   * The screen working area in view of normal work is all screen
  2255.     without system panel (the application '@panel').
  2256.   * (left,top) are coordinates of the left upper corner,
  2257.     (right,bottom) are coordinates of the right lower one.
  2258.     Thus the size of working area on x axis can be calculated by
  2259.     formula right-left+1, on y axis - by formula bottom-right+1.
  2260.   * See also function 14,
  2261.     to get sizes of all screen.
  2262.   * There is a pair function to set working area - subfunction 6.
  2263.  
  2264. ======================================================================
  2265. ======== Function 48, subfunction 6 - set screen working area. =======
  2266. ======================================================================
  2267. Parameters:
  2268.   * eax = 48 - function number
  2269.   * ebx = 6 - subfunction number
  2270.   * ecx = [left]*65536 + [right]
  2271.   * edx = [top]*65536 + [bottom]
  2272. Returned value:
  2273.   * function does not return value
  2274. Remarks:
  2275.   * The screen working area defines position and coordinates of
  2276.     a maximized window.
  2277.   * This function is used only by the application '@panel',
  2278.     which set working area to all screen without system panel.
  2279.   * (left,top) are coordinates of the left upper corner,
  2280.     (right,bottom) are coordinates of the right lower one.
  2281.     Thus the size of working area on x axis can be calculated by
  2282.     formula right-left+1, on y axis - by formula bottom-right+1.
  2283.   * If 'left'>='right', x-coordinate of working area is not changed.
  2284.     If 'left'<0, 'left' will not be set. If 'right' is greater than or
  2285.     equal to screen width, 'right' will not be set.
  2286.     Similarly on y axis.
  2287.   * See also function 14,
  2288.     to get sizes of all screen.
  2289.   * There is a pair function to get working area - subfunction 5.
  2290.   * This function redraws the screen automatically,
  2291.     updating coordinates and sizes of maximized windows.
  2292.     The system sends to all windows redraw message (the event 1).
  2293.  
  2294. ======================================================================
  2295. =========== Function 48, subfunction 7 - get skin margins. ===========
  2296. ======================================================================
  2297. Returns the area of a header of a skinned window, intended for
  2298. a text of a header.
  2299. Parameters:
  2300.   * eax = 48 - function number
  2301.   * ebx = 7 - subfunction number
  2302. Returned value:
  2303.   * eax = [left]*65536 + [right]
  2304.   * ebx = [top]*65536 + [bottom]
  2305. Remarks:
  2306.   * An application decides itself to use or not to use this function.
  2307.   * It is recommended to take into account returned value
  2308.     of this function for choice of a place for drawing header text
  2309.     (by function 4) or a substitute of header text
  2310.     (at the discretion of an application).
  2311.  
  2312. ======================================================================
  2313. ============= Function 48, subfunction 8 - set used skin. ============
  2314. ======================================================================
  2315. Parameters:
  2316.   * eax = 48 - function number
  2317.   * ebx = 8 - subfunction number
  2318.   * ecx = pointer to a block for function 58, in
  2319.     which the fields of intermediate buffer and file name are filled
  2320. Returned value:
  2321.   * eax = 0 - success
  2322.   * otherwise eax = file system error code; if file does not
  2323.     contain valid skin, function returns error 3
  2324.     (unknown file system).
  2325. Remarks:
  2326.   * After successful skin loading the system sends to all windows
  2327.     redraw message (the event 1).
  2328.   * At booting the system reads skin from file 'default.skn'
  2329.     on ramdisk.
  2330.   * User can change the skin statically by creating hisself
  2331.     'default.skn' or dynamically with the application 'desktop'.
  2332.  
  2333. ======================================================================
  2334. =========== Function 49 - Advanced Power Management (APM). ===========
  2335. ======================================================================
  2336. Parameters:
  2337.   * eax = 49 - function number
  2338.   * dx = number of the APM function
  2339.     (analogue of ax in APM specification)
  2340.   * bx, cx = parameters of the APM function
  2341. Returned value:
  2342.   * 16-bit registers ax, bx, cx, dx, si, di and carry flag CF
  2343.     are set according to the APM specification
  2344.   * high halves of 32-bit registers eax, ebx, ecx,
  2345.     edx, esi, edi are destroyed
  2346. Remarks:
  2347.   * APM 1.2 specification is described in the document
  2348.     "Advanced Power Management (APM) BIOS Specification"
  2349.     (Revision 1.2), available at
  2350.     http://www.microsoft.com/whdc/archive/amp_12.mspx;
  2351.     besides it is included in famous Interrupt List by Ralf Brown
  2352.     (http://www.pobox.com/~ralf/files.html,
  2353.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/).
  2354.  
  2355. ======================================================================
  2356. =================== Function 50 - set window shape. ==================
  2357. ======================================================================
  2358. Normal windows have rectangular shape. This function can give to
  2359. a window any shape. The shape is given by a set of points inside
  2360. the base rectangle belonging to a window. Position and coordinates
  2361. of the base rectangle are set by function 0
  2362. and changed by function 67.
  2363.  
  2364. --------------------------- Set shape data ---------------------------
  2365. Parameters:
  2366.   * eax = 50 - function number
  2367.   * ebx = 0 - subfunction number
  2368.   * ecx = pointer to shape data (array of bytes 0/1)
  2369. Returned value:
  2370.   * function does not return value
  2371.  
  2372. -------------------------- Set shape scale ---------------------------
  2373. Parameters:
  2374.   * eax = 50 - function number
  2375.   * ebx = 1 - subfunction number
  2376.   * ecx sets a scale: each byte of data defines
  2377.     (2^scale)*(2^scale) pixels
  2378. Returned value:
  2379.   * function does not return value
  2380. Remarks:
  2381.   * Default scale is 0 (scale factor is 1). If in the shape data
  2382.     one byte corresponds to one pixel, there is no necessity
  2383.     to set scale.
  2384.   * Let's designate xsize = window width (in pixels), ysize = height;
  2385.     pay attention, that they are one pixel more than defined by
  2386.     functions 0, 67.
  2387.   * On definition of scale xsize and ysize must be divisible
  2388.     on 2^scale.
  2389.   * Byte of data on offset 'a' must be 0/1 and defines belonging
  2390.     to a window of square with the side 2^scale (if scale=0,
  2391.     this is one pixel) and coordinates of the left upper corner
  2392.     (a mod (xsize shr scale), a div (xsize shr scale))
  2393.   * Data size: (xsize shr scale)*(ysize shr scale).
  2394.   * Data must be presented in the memory and not change
  2395.     after set of shape.
  2396.   * The system views the shape data at every window redraw by
  2397.     function 0.
  2398.   * The call of subfunction 0 with NULL pointer results in return
  2399.     to the rectangular shape.
  2400.  
  2401. ======================================================================
  2402. ==================== Function 51 - create thread. ====================
  2403. ======================================================================
  2404. Parameters:
  2405.   * eax = 51 - function number
  2406.   * ebx = 1 - unique subfunction
  2407.   * ecx = address of thread entry point (starting eip)
  2408.   * edx = pointer to thread stack (starting esp)
  2409. Returned value:
  2410.   * eax = -1 - error (there is too many threads)
  2411.   * otherwise eax = TID - thread identifier
  2412.     </UL>
  2413.  
  2414. ======================================================================
  2415. ==================== Function 54, subfunction 0 ======================
  2416. ============== Get the number of slots in the clipboard. =============
  2417. ======================================================================
  2418. Parameters:
  2419.   * eax = 54 - function number
  2420.   * ebx = 0 - subfunction number
  2421. Returned value:
  2422.   * eax = slots in the clipboard
  2423.   * eax = -1 - main list area not found
  2424.  
  2425. ======================================================================
  2426. ==================== Function 54, subfunction 1 ======================
  2427. ================= Read the data from the clipboard. ==================
  2428. ======================================================================
  2429. Parameters:
  2430.   * eax = 54 - function number
  2431.   * ebx = 1 - subfunction number
  2432.   * eсx = slot number
  2433. Returned value:
  2434.   * eax = if successful - pointer to a memory with data
  2435.   * eax = 1 - error
  2436.   * eax = -1 - main list area not found
  2437.  
  2438. ======================================================================
  2439. ==================== Function 54, subfunction 2 ======================
  2440. ================= Write the data to the clipboard. ===================
  2441. ======================================================================
  2442. Parameters:
  2443.   * eax = 54 - function number
  2444.   * ebx = 2 - subfunction number
  2445.   * eсx = the number of bytes to be copied
  2446.   * edx = a pointer to a buffer for data to be copied
  2447. Returned value:
  2448.   * eax = 0 - success
  2449.   * eax = 1 - error
  2450.   * eax = -1 - main list area not found
  2451.  
  2452. ======================================================================
  2453. ===================== Function 54, subfunction 3 =====================
  2454. ================ Delete the last slot in the clipboard ===============
  2455. ======================================================================
  2456. Parameters:
  2457.   * eax = 54 - function number
  2458.   * ebx = 3 - subfunction number
  2459. Returned value:
  2460.   * eax = 0 - success
  2461.   * eax = 1 - error
  2462.   * eax = -1 - main list area not found
  2463.  
  2464. ======================================================================
  2465. ===================== Function 54, subfunction 4 =====================
  2466. ===================== Alarm reset the lock buffer ====================
  2467. ======================================================================
  2468. Parameters:
  2469.   * eax = 54 - function number
  2470.   * ebx = 4 - subfunction number
  2471. Returned value:
  2472.   * eax = 0 - success
  2473.   * eax = -1 - main list area not found or no blocking
  2474. Remarks:
  2475.   * Used in exceptional cases, where no responsible or killed
  2476.     application blocked the clipboard operations.
  2477.  
  2478. ======================================================================
  2479.  Function 55, subfunction 55 - begin to play data on built-in speaker.
  2480. ======================================================================
  2481. Parameters:
  2482.   * eax = 55 - function number
  2483.   * ebx = 55 - subfunction number
  2484.   * esi = pointer to data
  2485. Returned value:
  2486.   * eax = 0 - success
  2487.   * eax = 55 - error (speaker is off or busy)
  2488. Data is an array of items with variable length.
  2489. Format of each item is defined by first byte:
  2490.   * 0 = end of data
  2491.   * 1..0x80 = sets sound duration on 1/100 of second; sound note
  2492.     is defined by immediate value of frequency
  2493.     * following word (2 bytes) contains frequency divider;
  2494.       frequency is defined as 1193180/divider
  2495.   * 0x81 = invalid
  2496.   * 0x82..0xFF = note is defined by octave and number:
  2497.     * duration in 1/100 of second = (first byte)-0x81
  2498.     * there is one more byte;
  2499.     * (second byte)=0xFF - delay
  2500.     * otherwise it looks like a*0x10+b, where b=number of the note in
  2501.       an octave from 1 to 12, a=number of octave (beginning from 0)
  2502. Remarks:
  2503.   * Speaker play can be disabled/enabled by
  2504.     subfunction 8 of function 18.
  2505.   * Function returns control, having informed the system
  2506.     an information on request. Play itself goes independently from
  2507.     the program.
  2508.   * The data must be kept in the memory at least up to the end
  2509.     of play.
  2510.  
  2511. ======================================================================
  2512. ======================= Function 57 - PCI BIOS. ======================
  2513. ======================================================================
  2514. Parameters:
  2515.   * eax = 57 - function number
  2516.   * ebp corresponds to al in PCI BIOS specification
  2517.   * other registers are set according to PCI BIOS specification
  2518. Returned value:
  2519.   * CF is undefined
  2520.   * other registers are set according to PCI BIOS specification
  2521. Remarks:
  2522.   * Many effects of this function can be also achieved with
  2523.     corresponding subfunctions of function 62.
  2524.   * The function calls PCI32 BIOS extension, documented e.g. in
  2525.     http://alpha1.dyns.net/files/PCI/bios21.pdf.
  2526.   * If BIOS does not support this extension, its behavior is emulated
  2527.     (through kernel-mode analogues of subfunctions of function 62).
  2528.  
  2529. ======================================================================
  2530. ================ Function 58 - work with file system. ================
  2531. ======================================================================
  2532. Parameters:
  2533.   * eax = 58
  2534.   * ebx = pointer to the information structure
  2535. Returned value:
  2536.   * eax = 0 - success; otherwise file system error code
  2537.   * some subfunctions return value in other registers too
  2538. General format of the information structure:
  2539.   * +0: dword: subfunction number
  2540.   * +4: dword: number of block
  2541.   * +8: dword: size
  2542.   * +12 = +0xC: dword: pointer to data
  2543.   * +16 = +0x10: dword: pointer to a memory for system operations
  2544.     (4096 bytes)
  2545.   * +20 = +0x14: n db: ASCIIZ-string with the file name
  2546. Specifications - in documentation on the appropriate subfunction.
  2547. Filename is case-insensitive for latin letters, russian letters
  2548. must be capital.
  2549. Format of filename:
  2550. /base/number/dir1/dir2/.../dirn/file,
  2551. where /base/number identifies device, on which file is located:
  2552. one of
  2553.   * /RD/1 = /RAMDISK/1 to access ramdisk
  2554.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  2555.     /FD/2 = /FLOPPYDISK/2 to access second one
  2556.   * /HD/x = /HARDDISK/x - obsolete variant of access to hard disk
  2557.     (in this case base is defined by subfunction 7 of function 21),
  2558.     x - partition number (beginning from 1)
  2559.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  2560.     IDE0 (Primary Master), IDE1 (Primary Slave),
  2561.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  2562.     x - partition number on the selected hard drive, varies from 1
  2563.     to 255 (on each hard drive the indexing starts from 1)
  2564. Remarks:
  2565.   * In the first two cases it is also possible to use FIRST
  2566.     instead of 1, SECOND instead of 2, but it is not recommended
  2567.     for convenience of transition to the future extensions.
  2568.   * Limitation n<=39 is imposed.
  2569.   * Names of folders and file dir1,...,dirn,file must have the
  2570.     format 8.3: name no more than 8 characters, dot, extension no
  2571.     more than 3 characters. Trailing spaces are ignored, no other
  2572.     spaces is allowed. If name occupies equally 8 characters,
  2573.     dot may be omitted (though it is not recommended to use this
  2574.     feature for convenience of transition to the future extensions).
  2575.   * This function does not support folders on ramdisk.
  2576. Examples:
  2577.   * '/RAMDISK/FIRST/KERNEL.ASM',0
  2578.     '/rd/1/kernel.asm',0
  2579.   * '/HD0/1/kernel.asm',0
  2580.   * '/hd0/1/menuet/pics/tanzania.bmp',0
  2581. Existing subfunctions:
  2582.   * subfunction 0 - read file/folder
  2583.   * subfunction 8 - LBA-read from device
  2584.   * subfunction 15 - get file system information
  2585.  
  2586. ======================================================================
  2587. =========== Function 58, subfunction 0 - read file/folder. ===========
  2588. ======================================================================
  2589. Parameters:
  2590.   * eax = 58
  2591.   * ebx = pointer to the information structure
  2592. Format of the information structure:
  2593.   * +0: dword: 0 = subfunction number
  2594.   * +4: dword: first block to read (beginning from 0)
  2595.   * +8: dword: amount of blocks to read
  2596.   * +12 = +0xC: dword: pointer to buffer for data
  2597.   * +16 = +0x10: dword: pointer to buffer for system operations
  2598.     (4096 bytes)
  2599.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2600.     given in the general description
  2601. Returned value:
  2602.   * eax = 0 - success, otherwise file system error code
  2603.   * ebx = file size (in bytes) or -1=0xffffffff, if file was not found
  2604. Remarks:
  2605.   * Block size is 512 bytes.
  2606.   * This function is obsolete, for reading files use subfunction 0
  2607.     of function 70, for reading folders - subfunction 1 of
  2608.     function 70.
  2609.   * Function can read contents of a folder. Only FAT file system is
  2610.     supported. The format of FAT-folder is described
  2611.     in any FAT documentation.
  2612.   * Size of a folder is determined by size of FAT clusters chain.
  2613.   * If file was ended before last requested block was read,
  2614.     the function will read as many as it can, and after that return
  2615.     eax=6 (EOF).
  2616.   * Function can read root folders /rd/1,/fd/x,/hd[n]/x, but
  2617.     in the first two cases the current implementation does not follow
  2618.     to the declared rules:
  2619.     for /rd/1:
  2620.     * if one want to read 0 blocks, function considers,
  2621.       that he requested 1;
  2622.     * if one requests more than 14 blocks or starting block is
  2623.       not less than 14, function returns eax=5 (not found) and ebx=-1;
  2624.     * size of ramdisk root folder is 14 blocks,
  2625.       0x1C00=7168 bytes; but function returns ebx=0
  2626.       (except of the case of previous item);
  2627.     * strangely enough, it is possible to read 14th block (which
  2628.       generally contains a garbage - I remind, the indexing begins
  2629.       from 0);
  2630.     * if some block with the number not less than 14 was requested,
  2631.       function returns eax=6(EOF); otherwise eax=0.
  2632.     For /fd/x:
  2633.     * if the start block is not less than 14, function returns
  2634.       eax=5 (not found) and ebx=0;
  2635.     * note that format of FAT12 allows floppies with the root size
  2636.       more or less than 14 blocks;
  2637.     * check for length is not performed;
  2638.     * if data was successful read, function returns
  2639.       eax=0,ebx=0; otherwise eax=10 (access denied), ebx=-1.
  2640.   * The function handles reading of special folders /,/rd,/fd,/hd[n];
  2641.     but the result does not correspond to expected (on operations with
  2642.     normal files/folders), does not follow the declared rules,
  2643.     may be changed in future versions of the kernel and consequently
  2644.     is not described. To obtain the information about the equipment
  2645.     use subfunction 11 of function 18 or
  2646.     read corresponding folder with subfunction 1 of function 70.
  2647.  
  2648. ======================================================================
  2649. ========= Function 58, subfunction 8 - LBA-read from device. =========
  2650. ======================================================================
  2651. Parameters:
  2652.   * eax = 58 - function number
  2653.   * ebx = pointer to the information structure
  2654. Format of the information structure:
  2655.   * +0: dword: 8 = subfunction number
  2656.   * +4: dword: number of block to read (beginning from 0)
  2657.   * +8: dword: ignored (set to 1)
  2658.   * +12 = +0xC: dword: pointer to buffer for data (512 bytes)
  2659.   * +16 = +0x10: dword: pointer to buffer for system operations
  2660.     (4096 bytes)
  2661.   * +20 = +0x14: ASCIIZ-name of device: case-insensitive, one of
  2662.     /rd/1 = /RamDisk/1, /hd/n = /HardDisk/n,
  2663.     1<=n<=4 - number of device: 1=IDE0, ..., 4=IDE3.
  2664.     Instead of digits it is allowed, though not recommended for
  2665.     convenience of transition to future extensions, to use
  2666.     'first','second','third','fourth'.
  2667. Returned value:
  2668.   * for device name /hd/xxx, where xxx is not in the list above:
  2669.     * eax = ebx = 1
  2670.   * for invalid device name (except for the previous case):
  2671.     * eax = 5
  2672.     * ebx does not change
  2673.   * if LBA-access is disabled by subfunction 11 of function 21:
  2674.     * eax = 2
  2675.     * ebx destroyed
  2676.   * for ramdisk: attempt to read block outside ramdisk
  2677.     (18*2*80 blocks) results in
  2678.     * eax = 3
  2679.     * ebx = 0
  2680.   * for successful read:
  2681.     * eax = ebx = 0
  2682. Remarks:
  2683.   * Block size is 512 bytes; function reads one block.
  2684.   * Do not depend on returned value, it can be changed
  2685.     in future versions.
  2686.   * Function requires that LBA-access to devices is enabled by
  2687.     subfunction 11 of function 21. To check this one can use
  2688.     subfunction 11 of function 26.
  2689.   * LBA-read of floppy is not supported.
  2690.   * Function reads data on physical hard drive; if for any reason
  2691.     data of the concrete partition are required, application must
  2692.     define starting sector of this partition (either directly
  2693.     through MBR, or from the full structure returned by
  2694.     subfunction 11 of function 18).
  2695.   * Function does not check error code of hard disk, so request of
  2696.     nonexisting sector reads something (most probably it will be
  2697.     zeroes, but this is defined by device) and this is considered
  2698.     as success (eax=0).
  2699.  
  2700. ======================================================================
  2701. ==== Function 58, subfunction 15 - get information on file system. ===
  2702. ======================================================================
  2703. Parameters:
  2704.   * eax = 58 - function number
  2705.   * ebx = pointer to the information structure
  2706. Format of the information structure:
  2707.   * +0: dword: 15 = subfunction number
  2708.   * +4: dword: ignored
  2709.   * +8: dword: ignored
  2710.   * +12 = +0xC: dword: ignored
  2711.   * +16 = +0x10: dword: ignored
  2712.   * +20 = +0x14: (only second character is checked)
  2713.     /rd=/RAMDISK or /hd=/HARDDISK
  2714. Returned value:
  2715.   * if the second character does not belong to set {'r','R','h','H'}:
  2716.     * eax = 3
  2717.     * ebx = ecx = dword [fileinfo] = 0
  2718.   * for ramdisk:
  2719.     * eax = 0 (success)
  2720.     * ebx = total number of clusters = 2847
  2721.     * ecx = number of free clusters
  2722.     * dword [fileinfo] = cluster size = 512
  2723.   * for hard disk: base and partition are defined by subfunctions
  2724.     7 and 8 of function 21:
  2725.     * eax = 0 (success)
  2726.     * ebx = total number of clusters
  2727.     * ecx = number of free clusters
  2728.     * dword [fileinfo] = cluster size (in bytes)
  2729. Remarks:
  2730.   * Be not surprised to strange layout of 4th returned parameter
  2731.     - when this code was writing, at system calls application got
  2732.     only registers eax,ebx,ecx (from pushad-structure transmitted
  2733.     as argument to the system function). Now it is corrected, so,
  2734.     probably, it is meaningful to return cluster size in edx, while
  2735.     this function is not used yet.
  2736.   * There exists also subfunction 11 of function 18,
  2737.     which returns information on file system. From the full table
  2738.     of disk subsystem it is possible to deduce cluster size (there
  2739.     it is stored in sectors) and total number of clusters
  2740.     for hard disks.
  2741.  
  2742. ======================================================================
  2743. ========== Function 60 - Inter Process Communication (IPC). ==========
  2744. ======================================================================
  2745. IPC is used for message dispatching from one process/thread to
  2746. another. Previously it is necessary to agree how to interpret
  2747. the concrete message.
  2748.  
  2749. ----------- Subfunction 1 - set the area for IPC receiving -----------
  2750. Is called by process-receiver.
  2751. Parameters:
  2752.   * eax = 60 - function number
  2753.   * ebx = 1 - subfunction number
  2754.   * ecx = pointer to the buffer
  2755.   * edx = size of the buffer
  2756. Returned value:
  2757.   * eax = 0 - always success
  2758. Format of IPC-buffer:
  2759.   * +0: dword: if nonzero, buffer is considered locked;
  2760.     lock/unlock the buffer, when you work with it and need that
  2761.     buffer data are not changed from outside (no new messages)
  2762.   * +4: dword: occupied place in the buffer (in bytes)
  2763.   * +8: first message
  2764.   * +8+n: second message
  2765.   * ...
  2766. Format of a message:
  2767.   * +0: dword: PID of sender
  2768.   * +4: dword: message length (not including this header)
  2769.   * +8: n*byte: message data
  2770.  
  2771. ------------------ Subfunction 2 - send IPC message ------------------
  2772. Is called by process-sender.
  2773. Parameters:
  2774.   * eax = 60 - function number
  2775.   * ebx = 2 - subfunction number
  2776.   * ecx = PID of receiver
  2777.   * edx = pointer to the message data
  2778.   * esi = message length (in bytes)
  2779. Returned value:
  2780.   * eax = 0 - success
  2781.   * eax = 1 - the receiver has not defined buffer for IPC messages
  2782.     (can be, still have no time,
  2783.     and can be, this is not right process)
  2784.   * eax = 2 - the receiver has blocked IPC-buffer; try to wait a bit
  2785.   * eax = 3 - overflow of IPC-buffer of the receiver
  2786.   * eax = 4 - process/thread with such PID does not exist
  2787. Remarks:
  2788.   * Immediately after writing of IPC-message to the buffer the system
  2789.     sends to the receiver the event with code 7 (see event codes).
  2790.  
  2791. ======================================================================
  2792. ==== Function 61 - get parameters for the direct graphics access. ====
  2793. ======================================================================
  2794. The data of the graphics screen (the memory area which displays
  2795. screen contents) are accessible to a program directly, without
  2796. any system calls, through the selector gs:
  2797.         mov     eax, [gs:0]
  2798. places in eax the first dword of the buffer, which contains
  2799. information on color of the left upper point (and, possibly, colors
  2800. of several following).
  2801.         mov     [gs:0], eax
  2802. by work in VESA modes with LFB sets color of the left upper point
  2803. (and, possibly, colors of several following).
  2804. To interpret the data of graphics screen program needs to know
  2805. some parameters, returning by this function.
  2806. Remarks:
  2807.   * Graphics parameters changes very seldom at work,
  2808.     namely, only in cases, when user works with the application VRR.
  2809.   * At videomode change the system redraws all windows (event
  2810.     with code 1) and redraws the background (event 5).
  2811.     Same events occur in other cases too, which meet much more often,
  2812.     than videomode change.
  2813.   * By operation in videomodes with LFB the selector gs points to
  2814.     LFB itself, so reading/writing on gs result directly in
  2815.     change of screen contents. By operation in videomodes without
  2816.     LFB gs points to some data area in the kernel, and all functions
  2817.     of screen output fulfil honesty double operation on writing
  2818.     directly to the screen and writing to this buffer. In result
  2819.     at reading contents of this buffer the results correspond to
  2820.     screen contents (with, generally speaking, large color
  2821.     resolution), and writing is ignored.
  2822.     One exception is the mode 320*200, for which main loop of the
  2823.     system thread updates the screen according to mouse movements.
  2824.  
  2825. ------------------------- Screen resolution --------------------------
  2826. Parameters:
  2827.   * eax = 61 - function number
  2828.   * ebx = 1 - subfunction number
  2829. Returned value:
  2830.   * eax = [resolution on x axis]*65536 + [resolution on y axis]
  2831. Remarks:
  2832.   * One can use function 14 paying attention that
  2833.     it returns sizes on 1 pixel less. It is fully equivalent way.
  2834.  
  2835. ---------------------- Number of bits per pixel ----------------------
  2836. Parameters:
  2837.   * eax = 61 - function number
  2838.   * ebx = 2 - subfunction number
  2839. Returned value:
  2840.   * eax = number of bits per pixel (24 or 32)
  2841.  
  2842. -------------------- Number of bytes per scanline --------------------
  2843. Parameters:
  2844.   * eax = 61 - function number
  2845.   * ebx = 3 - subfunction number
  2846. Returned value:
  2847.   * eax = number of bytes occupied by one scanline
  2848.     (horizontal line on the screen)
  2849.  
  2850. ======================================================================
  2851. ===== Function 62, subfunction 0 - get version of PCI-interface. =====
  2852. ======================================================================
  2853. Parameters:
  2854.   * eax = 62 - function number
  2855.   * bl = 0 - subfunction number
  2856. Returned value:
  2857.   * eax = -1 - PCI access is disabled; otherwise
  2858.   * ah.al = version of PCI-interface (ah=version, al=subversion)
  2859.   * high word of eax is zeroed
  2860. Remarks:
  2861.   * Previously low-level access to PCI for applications must be
  2862.     enabled by subfunction 12 of function 21.
  2863.   * If PCI BIOS is not supported, the value of ax is undefined.
  2864.  
  2865. ======================================================================
  2866. ==== Function 62, subfunction 1 - get number of the last PCI-bus. ====
  2867. ======================================================================
  2868. Parameters:
  2869.   * eax = 62 - function number
  2870.   * bl = 1 - subfunction number
  2871. Returned value:
  2872.   * eax = -1 - access to PCI is disabled; otherwise
  2873.   * al = number of the last PCI-bus; other bytes of eax are destroyed
  2874. Remarks:
  2875.   * Previously low-level access to PCI for applications must be
  2876.     enabled by subfunction 12 of function 21.
  2877.   * If PCI BIOS is not supported, the value of ax is undefined.
  2878.  
  2879. ======================================================================
  2880. ===================== Function 62, subfunction 2 =====================
  2881. ===== Get mechanism of addressing to the PCI configuration space. ====
  2882. ======================================================================
  2883. Parameters:
  2884.   * eax = 62 - function number
  2885.   * bl = 2 - subfunction number
  2886. Returned value:
  2887.   * eax = -1 - access to PCI is disabled; otherwise
  2888.   * al = mechanism (1 or 2); other bytes of eax are destroyed
  2889. Remarks:
  2890.   * Previously low-level access to PCI for applications must be
  2891.     enabled by subfunction 12 of function 21.
  2892.   * Addressing mechanism is selected depending on
  2893.     equipment characteristics.
  2894.   * Subfunctions of read and write work automatically
  2895.     with the selected mechanism.
  2896.  
  2897. ======================================================================
  2898. ======== Function 62, subfunctions 4,5,6 - read PCI-register. ========
  2899. ======================================================================
  2900. Parameters:
  2901.   * eax = 62 - function number
  2902.   * bl = 4 - read byte
  2903.   * bl = 5 - read word
  2904.   * bl = 6 - read dword
  2905.   * bh = number of PCI-bus
  2906.   * ch = dddddfff, where ddddd = number of the device on the bus,
  2907.     fff = function number of device
  2908.   * cl = number of register (must be even for bl=5,
  2909.     divisible by 4 for bl=6)
  2910. Returned value:
  2911.   * eax = -1 - error (access to PCI is disabled or parameters
  2912.     are not supported); otherwise
  2913.   * al/ax/eax (depending on requested size) contains the data;
  2914.     the other part of register eax is destroyed
  2915. Remarks:
  2916.   * Previously low-level access to PCI for applications must be
  2917.     enabled by subfunction 12 of function 21.
  2918.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  2919.     function number. To get access mechanism use subfunction 2.
  2920.   * Some registers are standard and exist for all devices, some are
  2921.     defined by the concrete device. The list of registers of the
  2922.     first type can be found e.g. in famous
  2923.     Interrupt List by Ralf Brown
  2924.     (http://www.pobox.com/~ralf/files.html,
  2925.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/);
  2926.     registers of the second type must be listed
  2927.     in the device documentation.
  2928.  
  2929. ======================================================================
  2930. ====== Function 62, subfunctions 8,9,10 - write to PCI-register. =====
  2931. ======================================================================
  2932. Parameters:
  2933.   * eax = 62 - function number
  2934.   * bl = 8 - write byte
  2935.   * bl = 9 - write word
  2936.   * bl = 10 - write dword
  2937.   * bh = number of PCI-bus
  2938.   * ch = dddddfff, where ddddd = number of the device on the bus,
  2939.     fff = function number of device
  2940.   * cl = number of register (must be even for bl=9,
  2941.     divisible by 4 for bl=10)
  2942.   * dl/dx/edx (depending on requested size) contatins
  2943.     the data to write
  2944. Returned value:
  2945.   * eax = -1 - error (access to PCI is disabled or parameters
  2946.     are not supported)
  2947.   * eax = 0 - success
  2948. Remarks:
  2949.   * Previously low-level access to PCI for applications must be
  2950.     enabled by subfunction 12 of function 21.
  2951.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  2952.     function number. To get access mechanism use subfunction 2.
  2953.   * Some registers are standard and exist for all devices, some are
  2954.     defined by the concrete device. The list of registers of the
  2955.     first type can be found e.g. in famous Interrupt List by
  2956.     Ralf Brown; registers of the second type must be listed
  2957.     in the device documentation.
  2958.  
  2959. ======================================================================
  2960. ============== Function 63 - work with the debug board. ==============
  2961. ======================================================================
  2962. The debug board is the global system buffer (with the size
  2963. 1024 bytes), to which any program can write (generally speaking,
  2964. arbitrary) data and from which other program can read these data.
  2965. By the agreement written data are text strings interpreted as
  2966. debug messages on a course of program execution. The kernel in
  2967. some situations also writes to the debug board information on
  2968. execution of some functions; by the agreement kernel messages
  2969. begins from the prefix "K : ".
  2970. For view of the debug board the application 'board' was created,
  2971. which reads data from the buffer and displays them in its window.
  2972. 'board' interpretes the sequence of codes 13,10 as newline.
  2973. A character with null code in an end of line is not necessary,
  2974. but also does not prevent.
  2975. Because debugger has been written, the value of the debug board
  2976. has decreased, as debugger allows to inspect completely a course of
  2977. program execution without any efforts from the direction of program
  2978. itself. Nevertheless in some cases the debug board is still useful.
  2979.  
  2980. ----------------------------- Write byte -----------------------------
  2981. Parameters:
  2982.   * eax = 63 - function number
  2983.   * ebx = 1 - subfunction number
  2984.   * cl = data byte
  2985. Returned value:
  2986.   * function does not return value
  2987. Remarks:
  2988.   * Byte is written to the buffer. Buffer size is 512 bytes.
  2989.     At buffer overflow all obtained data are lost.
  2990.   * For output to the debug board of more complicated objects
  2991.     (strings, numbers) it is enough to call this function in cycle.
  2992.     It is possible not to write the appropriate code manually and use
  2993.     file 'debug.inc', which is included into the distributive.
  2994.  
  2995. ----------------------------- Read byte ------------------------------
  2996. Takes away byte from the buffer.
  2997. Parameters:
  2998.   * eax = 63 - function number
  2999.   * ebx = 2 - subfunction number
  3000. Returned value:
  3001.   * eax = ebx = 0 - the buffer is empty
  3002.   * eax = byte, ebx = 1 - byte was successfully read
  3003.  
  3004. ======================================================================
  3005. ============== Function 64 - resize application memory. ==============
  3006. ======================================================================
  3007. Parameters:
  3008.   * eax = 64 - function number
  3009.   * ebx = 1 - unique subfunction
  3010.   * ecx = new memory size
  3011. Returned value:
  3012.   * eax = 0 - success
  3013.   * eax = 1 - not enough memory
  3014. Remarks:
  3015.   * There is another way to dynamically allocate/free memory -
  3016.     subfunctions 11, 12, 13 of function 68.
  3017.   * The function cannot be used together with 68.11, 68.12, 68.13.
  3018.     The function call will be ignored after creation of process heap
  3019.     with function 68.11.
  3020.  
  3021. ======================================================================
  3022. ======== Function 65 - draw image with palette in the window. ========
  3023. ======================================================================
  3024. Parameters:
  3025.   * eax = 65 - function number
  3026.   * ebx = pointer to the image
  3027.   * ecx = [size on axis x]*65536 + [size on axis y]
  3028.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  3029.   * esi = number of bits per pixel, must be 1,2,4,8,9,15,16,24 or 32;
  3030.   * edi = pointer to palette (2 to the power esi colors 0x00RRGGBB);
  3031.           ignored when esi > 8
  3032.   * ebp = offset of next row data relative to previous row data
  3033. Returned value:
  3034.   * function does not return value
  3035. Remarks:
  3036.   * Coordinates of the image are coordinates of the upper left corner
  3037.     of the image relative to the window.
  3038.   * Format of image with 1 bit per pixel: each byte of image
  3039.     (possibly excluding last bytes in rows), contains information on
  3040.     the color of 8 pixels, MSB corresponds to first pixel.
  3041.   * Format of image with 2 bits per pixel: each byte of image
  3042.     (possibly excluding last bytes in rows), contains information on
  3043.     the color of 4 pixels, two MSBs correspond to first pixel.
  3044.   * Format of image with 4 bits per pixel: each byte of image
  3045.     excluding last bytes in rows (if width is odd) contains
  3046.     information on the color of 2 pixels, high-order tetrad
  3047.     corresponds to first pixel.
  3048.   * Format of image with 8 bits per pixel: each byte of image is
  3049.     index in the palette.
  3050.   * Format of image with 9 bits per pixel: array of one byte values;
  3051.     each byte (8 bit) represents the intensity of gray for one pixel;
  3052.     this format is equal to 8bpp without palette.
  3053.   * Format of image with 15 bits per pixel: the color of each pixel
  3054.     is coded as (bit representation) 0RRRRRGGGGGBBBBB - 5 bits per
  3055.     each color.
  3056.   * Format of image with 16 bits per pixel: the color of each pixel
  3057.     is coded as RRRRRGGGGGGBBBBB (5+6+5).
  3058.   * Format of image with 24 bits per pixel: the color of each pixel
  3059.     is coded as 3 bytes - sequentially blue, green, red components.
  3060.   * Format of image with 32 bits per pixel: similar to 24, but
  3061.     one additional ignored byte is present.
  3062.   * The call to function 7 is equivalent to call to this function
  3063.     with esi=24, ebp=0.
  3064.  
  3065. ======================================================================
  3066. ================== Function 66 - work with keyboard. =================
  3067. ======================================================================
  3068. The input mode influences results of reading keys by function 2.
  3069. When a program loads, ASCII input mode is set for it.
  3070.  
  3071. -------------- Subfunction 1 - set keyboard input mode. --------------
  3072. Parameters:
  3073.   * eax = 66 - function number
  3074.   * ebx = 1 - subfunction number
  3075.   * ecx = mode:
  3076.     * 0 = normal (ASCII-characters)
  3077.     * 1 = scancodes
  3078. Returned value:
  3079.   * function does not return value
  3080.  
  3081. -------------- Subfunction 2 - get keyboard input mode. --------------
  3082. Parameters:
  3083.   * eax = 66 - function number
  3084.   * ebx = 2 - subfunction number
  3085. Returned value:
  3086.   * eax = current mode
  3087.  
  3088. ------------ Subfunction 3 - get status of control keys. -------------
  3089. Parameters:
  3090.   * eax = 66 - function number
  3091.   * ebx = 3 - subfunction number
  3092. Returned value:
  3093.   * eax = bit mask:
  3094.   * bit 0  (mask 1): left Shift is pressed
  3095.   * bit 1  (mask 2): right Shift is pressed
  3096.   * bit 2  (mask 4): left Ctrl is pressed
  3097.   * bit 3  (mask 8): right Ctrl is pressed
  3098.   * bit 4  (mask 0x10): left Alt is pressed
  3099.   * bit 5  (mask 0x20): right Alt is pressed
  3100.   * bit 6  (mask 0x40): CapsLock is on
  3101.   * bit 7  (mask 0x80): NumLock is on
  3102.   * bit 8  (mask 0x100): ScrollLock is on
  3103.   * bit 9  (mask 0x200): left Win is pressed
  3104.   * bit 10 (mask 0x400): right Win is pressed
  3105.   * other bits are cleared
  3106.  
  3107. -------------- Subfunction 4 - set system-wide hotkey. ---------------
  3108. When hotkey is pressed, the system notifies only those applications,
  3109. which have installed it; the active application (which receives
  3110. all normal input) does not receive such keys.
  3111. The notification consists in sending event with the code 2.
  3112. Reading hotkey is the same as reading normal key - by function 2.
  3113. Parameters:
  3114.   * eax = 66 - function number
  3115.   * ebx = 4 - subfunction number
  3116.   * cl determines key scancode;
  3117.     use cl=0 to give combinations such as Ctrl+Shift
  3118.   * edx = 0xXYZ determines possible states of control keys:
  3119.     * Z (low 4 bits) determines state of LShift and RShift:
  3120.       * 0 = no key must be pressed;
  3121.       * 1 = exactly one key must be pressed;
  3122.       * 2 = both keys must be pressed;
  3123.       * 3 = must be pressed LShift, but not RShift;
  3124.       * 4 = must be pressed RShift, but not LShift
  3125.     * Y - similar for LCtrl and RCtrl;
  3126.     * X - similar for LAlt and RAlt
  3127. Returned value:
  3128.   * eax=0 - success
  3129.   * eax=1 - too mant hotkeys (maximum 256 are allowed)
  3130. Remarks:
  3131.   * Hotkey can work either at pressing or at release. Release
  3132.     scancode of a key is more on 128 than pressing scancode
  3133.     (i.e. high bit is set).
  3134.   * Several applications can set the same combination;
  3135.     all such applications will be informed on pressing
  3136.     such combination.
  3137.  
  3138. -------------- Subfunction 5 - delete installed hotkey. --------------
  3139. Parameters:
  3140.   * eax = 66 - function number
  3141.   * ebx = 5 - subfunction number
  3142.   * cl = scancode of key and edx = 0xXYZ the same as in subfunction 4
  3143. Returned value:
  3144.   * eax = 0 - success
  3145.   * eax = 1 - there is no such hotkey
  3146. Remarks:
  3147.   * When a process/thread terminates, all hotkey installed by it are
  3148.     deleted.
  3149.   * The call to this subfunction does not affect other applications.
  3150.     If other application has defined the same combination, it will
  3151.     still receive notices.
  3152.  
  3153. --------------- Subfunction 6 - block the normal input. --------------
  3154. Parameters:
  3155.   * eax = 66 - function number
  3156.   * ebx = 6 - subfunction number
  3157. Returned value:
  3158.   * function does not return value
  3159. Remarks:
  3160.   * Blocking the normal keyboard input for installed hotkeys
  3161.   * To emulate a mouse via the keyboard, the application MOUSEMUL
  3162.  
  3163. ------------ Subfunction 7 - unlock the normal input. ----------------
  3164. Parameters:
  3165.   * eax = 66 - function number
  3166.   * ebx = 7 - subfunction number
  3167. Returned value:
  3168.   * function does not return value
  3169. Remarks:
  3170.   * Unlocking the results of the f. 66.6
  3171.   * To emulate a mouse via the keyboard, the application MOUSEMUL
  3172.  
  3173. ======================================================================
  3174. ========= Function 67 - change position/sizes of the window. =========
  3175. ======================================================================
  3176. Parameters:
  3177.   * eax = 67 - function number
  3178.   * ebx = new x-coordinate of the window
  3179.   * ecx = new y-coordinate of the window
  3180.   * edx = new x-size of the window
  3181.   * esi = new y-size of the window
  3182. Returned value:
  3183.   * function does not return value
  3184. Remarks:
  3185.   * The value -1 for a parameter means "do not change"; e.g. to move
  3186.     the window without resizing it is possible to specify edx=esi=-1.
  3187.   * Previously the window must be defined by function 0.
  3188.     It sets initial coordinates and sizes of the window.
  3189.   * Sizes of the window are understood in sense of function 0,
  3190.     that is one pixel less than real sizes.
  3191.   * The function call for maximized windows is simply ignored.
  3192.   * For windows of appropriate styles position and/or sizes can be
  3193.     changed by user; current position and sizes can be obtained by
  3194.     call to function 9.
  3195.   * The function sends to the window redraw event (with the code 1).
  3196.  
  3197. ======================================================================
  3198. ====== Function 68, subfunction 0 - get the task switch counter. =====
  3199. ======================================================================
  3200. Parameters:
  3201.   * eax = 68 - function number
  3202.   * ebx = 0 - subfunction number
  3203. Returned value:
  3204.   * eax = number of task switches from the system booting
  3205.     (modulo 2^32)
  3206.  
  3207. ======================================================================
  3208. ======= Function 68, subfunction 1 - switch to the next thread. ======
  3209. ======================================================================
  3210. The function completes the current time slice allocated to the
  3211. thread and switches to the next. (Which thread in which process
  3212. will be next, is unpredictable). Later, when execution queue
  3213. will reach the current thread, execution will be continued.
  3214. Parameters:
  3215.   * eax = 68 - function number
  3216.   * ebx = 1 - subfunction number
  3217. Returned value:
  3218.   * function does not return value
  3219.  
  3220. ======================================================================
  3221. ============= Function 68, subfunction 2 - cache + rdpmc. ============
  3222. ======================================================================
  3223. Parameters:
  3224.   * eax = 68 - function number
  3225.   * ebx = 2 - subfunction number
  3226.   * ecx = required action:
  3227.     * ecx = 0 - enable instruction 'rdpmc'
  3228.       (ReaD Performance-Monitoring Counters) for applications
  3229.     * ecx = 1 - find out whether cache is disabled/enabled
  3230.     * ecx = 2 - enable cache
  3231.     * ecx = 3 - disable cache
  3232. Returned value:
  3233.   * for ecx=0:
  3234.     * eax = the value of cr4
  3235.   * for ecx=1:
  3236.     * eax = (cr0 and 0x60000000):
  3237.     * eax = 0 - cache is on
  3238.     * eax <> 0 - cache is off
  3239.   * for ecx=2 and ecx=3:
  3240.     * function does not return value
  3241.  
  3242. ======================================================================
  3243. =========== Function 68, subfunction 3 - read MSR-register. ==========
  3244. ======================================================================
  3245. MSR = Model Specific Register; the complete list of MSR-registers
  3246. of a processor is included to the documentation on it (for example,
  3247. IA-32 Intel Architecture Software Developer's Manual,
  3248. Volume 3, Appendix B); each processor family has its own subset
  3249. of the MSR-registers.
  3250. Parameters:
  3251.   * eax = 68 - function number
  3252.   * ebx = 3 - subfunction number
  3253.   * ecx is ignored
  3254.   * edx = MSR address
  3255. Returned value:
  3256.   * ebx:eax = high:low dword of the result
  3257. Remarks:
  3258.   * If ecx contains nonexistent or not implemented for this processor
  3259.     MSR, processor will generate an exception in the kernel, which
  3260.     will kill the thread.
  3261.   * Previously it is necessary to check, whether MSRs are supported
  3262.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3263.     will generate other exception in the kernel, which will anyway
  3264.     kill the thread.
  3265.  
  3266. ======================================================================
  3267. ========= Function 68, subfunction 4 - write to MSR-register. ========
  3268. ======================================================================
  3269. MSR = Model Specific Register; the complete list of MSR-registers
  3270. of a processor is included to the documentation on it (for example,
  3271. IA-32 Intel Architecture Software Developer's Manual,
  3272. Volume 3, Appendix B); each processor family has its own subset
  3273. of the MSR-registers.
  3274. Parameters:
  3275.   * eax = 68 - function number
  3276.   * ebx = 4 - subfunction number
  3277.   * ecx is ignored
  3278.   * edx = MSR address
  3279.   * esi:edi = high:low dword
  3280. Returned value:
  3281.   * function does not return value
  3282. Remarks:
  3283.   * If ecx contains nonexistent or not implemented for this processor
  3284.     MSR, processor will generate an exception in the kernel, which
  3285.     will kill the thread.
  3286.   * Previously it is necessary to check, whether MSRs are supported
  3287.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3288.     will generate other exception in the kernel, which will anyway
  3289.     kill the thread.
  3290.  
  3291. ======================================================================
  3292. ======= Function 68, subfunction 11 - initialize process heap. =======
  3293. ======================================================================
  3294. Parameters:
  3295.   * eax = 68 - function number
  3296.   * ebx = 11 - subfunction number
  3297. Returned value:
  3298.   * eax = 0 - failed
  3299.   * otherwise size of created heap
  3300. Remarks:
  3301.   * The function call initializes heap, from which one can in future
  3302.     allocate and free memory blocks with subfunctions 12 and 13.
  3303.     Heap size is equal to total amount of free application memory.
  3304.   * The second function call from the same process results in
  3305.     returning the size of the existing heap.
  3306.   * After creation of the heap calls to function 64 will be ignored.
  3307.  
  3308. ======================================================================
  3309. ======== Function 68, subfunction 12 - allocate memory block. ========
  3310. ======================================================================
  3311. Parameters:
  3312.   * eax = 68 - function number
  3313.   * ebx = 12 - subfunction number
  3314.   * ecx = required size in bytes
  3315. Returned value:
  3316.   * eax = pointer to the allocated block
  3317. Remarks:
  3318.   * Before this call one must initialize process heap by call to
  3319.     subfunction 11.
  3320.   * The function allocates an integer number of pages (4 Kb) in such
  3321.     way that the real size of allocated block is more than or equal to
  3322.     requested size.
  3323.  
  3324. ======================================================================
  3325. ========== Function 68, subfunction 13 - free memory block. ==========
  3326. ======================================================================
  3327. Parameters:
  3328.   * eax = 68 - function number
  3329.   * ebx = 13 - subfunction number
  3330.   * ecx = pointer to the memory block
  3331. Returned value:
  3332.   * eax = 1 - success
  3333.   * eax = 0 - failed
  3334. Remarks:
  3335.   * The memory block must have been allocated by subfunction 12
  3336.     or subfunction 20.
  3337.  
  3338. ======================================================================
  3339. ===================== Function 68, subfunction 14 ====================
  3340. ============ Wait for signal from another program/driver. ============
  3341. ======================================================================
  3342. Parameters:
  3343.   * eax = 68 - function number
  3344.   * ebx = 14 - subfunction number
  3345.   * ecx = pointer to the buffer for information (24 bytes)
  3346. Returned value:
  3347.   * buffer pointed to by ecx contains the following information:
  3348.     * +0: dword: identifier for following data of signal
  3349.     * +4: dword: data of signal (20 bytes), format of which is defined
  3350.           by the first dword
  3351.  
  3352. ======================================================================
  3353. ============= Function 68, subfunction 16 - load driver. =============
  3354. ======================================================================
  3355. Parameters:
  3356.   * eax = 68 - function number
  3357.   * ebx = 16 - subfunction number
  3358.   * ecx = pointer to ASCIIZ-string with driver name
  3359. Returned value:
  3360.   * eax = 0 - failed
  3361.   * otherwise eax = driver handle
  3362. Remarks:
  3363.   * If the driver was not loaded yet, it is loaded;
  3364.     if the driver was loaded yet, nothing happens.
  3365.   * Driver name is case-sensitive.
  3366.     Maximum length of the name is 16 characters, including
  3367.     terminating null character, the rest is ignored.
  3368.   * Driver ABC is loaded from file /rd/1/drivers/ABC.obj.
  3369.  
  3370. ======================================================================
  3371. ============ Function 68, subfunction 17 - driver control. ===========
  3372. ======================================================================
  3373. Parameters:
  3374.   * eax = 68 - function number
  3375.   * ebx = 17 - subfunction number
  3376.   * ecx = pointer to the control structure:
  3377.     * +0: dword: handle of driver
  3378.     * +4: dword: code of driver function
  3379.     * +8: dword: pointer to input data
  3380.     * +12 = +0xC: dword: size of input data
  3381.     * +16 = +0x10: dword: pointer to output data
  3382.     * +20 = +0x14: dword: size of output data
  3383. Returned value:
  3384.   * eax = determined by driver
  3385. Remarks:
  3386.   * Function codes and the structure of input/output data
  3387.     are defined by driver.
  3388.   * Previously one must obtain driver handle by subfunction 16.
  3389.  
  3390. ======================================================================
  3391. =============== Function 68, subfunction 19 - load DLL. ==============
  3392. ======================================================================
  3393. Parameters:
  3394.   * eax = 68 - function number
  3395.   * ebx = 19 - subfunction number
  3396.   * ecx = pointer to ASCIIZ-string with the full path to DLL
  3397. Returned value:
  3398.   * eax = 0 - failed
  3399.   * otherwise eax = pointer to DLL export table
  3400. Remarks:
  3401.   * Export table is an array of structures of 2 dword's, terminated
  3402.     by zero. The first dword in structure points to function name,
  3403.     the second dword contains address of function.
  3404.  
  3405. ======================================================================
  3406. ======= Function 68, subfunction 20 - reallocate memory block. =======
  3407. ======================================================================
  3408. Parameters:
  3409.   * eax = 68 - function number
  3410.   * ebx = 20 - subfunction number
  3411.   * ecx = new size in bytes
  3412.   * edx = pointer to already allocated block
  3413. Returned value:
  3414.   * eax = pointer to the reallocated block, 0 = error
  3415. Remarks:
  3416.   * Before this call one must initialize process heap by call to
  3417.     subfunction 11.
  3418.   * The function allocates an integer number of pages (4 Kb) in such
  3419.     way that the real size of allocated block is more than or equal to
  3420.     requested size.
  3421.   * If edx=0, the function call is equivalent to memory allocation
  3422.     with subfunction 12. Otherwise the block at edx
  3423.     must be allocated earlier with subfunction 12 or this subfunction.
  3424.   * If ecx=0, the function frees memory block at edx and returns 0.
  3425.   * The contents of the block are unchanged up to the shorter of
  3426.     the new and old sizes.
  3427.  
  3428. ======================================================================
  3429. =========== Function 68, subfunction 21 - load driver PE. ============
  3430. ======================================================================
  3431. Parameters:
  3432.   * eax = 68 - function number
  3433.   * ebx = 21 - subfunction number
  3434.   * ecx = pointer to ASCIIZ-string with driver name
  3435.   * edx = pointer to command line
  3436. Returned value:
  3437.   * eax = 0 - failed
  3438.   * otherwise eax = driver handle
  3439. Remarks:
  3440.   * If the driver was not loaded yet, it is loaded;
  3441.     if the driver was loaded yet, nothing happens.
  3442.  
  3443. ======================================================================
  3444. ======== Function 68, subfunction 22 - open named memory area. =======
  3445. ======================================================================
  3446. Parameters:
  3447.   * eax = 68 - function number
  3448.   * ebx = 22 - subfunction number
  3449.   * ecx = area name. Maximum of 31 characters with terminating zero
  3450.   * edx = area size in bytes for SHM_CREATE and SHM_OPEN_ALWAYS
  3451.   * esi = flags for open and access:
  3452.     * SHM_OPEN        = 0x00 - open existing memory area. If an area
  3453.                           with such name does not exist, the function
  3454.                           will return error code 5.
  3455.     * SHM_OPEN_ALWAYS = 0x04 - open existing or create new
  3456.                           memory area.
  3457.     * SHM_CREATE      = 0x08 - create new memory area. If an area
  3458.                           with such name already exists, the function
  3459.                           will return error code 10.
  3460.     * SHM_READ        = 0x00 - only read access
  3461.     * SHM_WRITE       = 0x01 - read and write access
  3462. Returned value:
  3463.   * eax = pointer to memory area, 0 if error has occured
  3464.   * if new area is created (SHM_CREATE or SHM_OPEN_ALWAYS):
  3465.     edx = 0 - success, otherwise - error code
  3466.   * if existing area is opened (SHM_OPEN or SHM_OPEN_ALWAYS):
  3467.     edx = error code (if eax=0) or area size in bytes
  3468. Error codes:
  3469.   * E_NOTFOUND = 5
  3470.   * E_ACCESS = 10
  3471.   * E_NOMEM = 30
  3472.   * E_PARAM = 33
  3473. Remarks:
  3474.   * Before this call one must initialize process heap by call to
  3475.     subfunction 11.
  3476.   * If a new area is created, access flags set maximal rights
  3477.     for other processes. An attempt from other process to open
  3478.     with denied rights will fail with error code E_ACCESS.
  3479.   * The process which has created an area always has write access.
  3480.  
  3481. ======================================================================
  3482. ======= Function 68, subfunction 23 - close named memory area. =======
  3483. ======================================================================
  3484. Parameters:
  3485.   * eax = 68 - function number
  3486.   * ebx = 23 - subfunction number
  3487.   * ecx = area name. Maximum of 31 characters with terminating zero
  3488. Returned value:
  3489.   * eax destroyed
  3490. Remarks:
  3491.   * A memory area is physically freed (with deleting all data and
  3492.     freeing physical memory), when all threads which have opened
  3493.     this area will close it.
  3494.   * When thread is terminating, all opened by it areas are closed.
  3495.  
  3496. ======================================================================
  3497. ======== Function 68, subfunction 24 - set exception handler. ========
  3498. ======================================================================
  3499. Parameters:
  3500.   * eax = 68 - function number
  3501.   * ebx = 24 - subfunction number
  3502.   * ecx = address of the new exception handler
  3503.   * edx = the mask of handled exceptions
  3504. Returned value:
  3505.   * eax = address of the old exception handler (0, if it was not set)
  3506.   * ebx = the old mask of handled exceptions
  3507. Remarks:
  3508.   * Bit number in mask of exceptions corresponds to exception number
  3509.     in CPU-specification (Intel-PC). For example, FPU exceptions have
  3510.     number 16 (#MF), and SSE exceptions - 19 (#XF).
  3511.   * The current implementation ignores the inquiry for hook of 7
  3512.     exception - the system handles #NM by its own.
  3513.   * The exception handler is called with exception number as first
  3514.     (and only) stack parameter. So, correct exit from the handler is
  3515.     RET 4. It returns to the instruction, that caused the exception,
  3516.     for faults, and to the next instruction for traps (see
  3517.     classification of exceptions in CPU specification).
  3518.   * When user handler receives control, the corresponding bit in
  3519.     the exception mask is cleared. Raising this exception
  3520.     in consequence leads to default handling, that is,
  3521.     terminating the application in absence of debugger or
  3522.     suspend with notification of debugger otherwise.
  3523.   * After user handler completes critical operations, it can set
  3524.     the corresponding bit in the exception mask with subfunction 25.
  3525.     Also user handler is responsible for clearing exceptions flags in
  3526.     FPU and/or SSE.
  3527.  
  3528. ======================================================================
  3529. ====== Function 68, subfunction 25 - set FPU exception handler. ======
  3530. ======================================================================
  3531. Parameters:
  3532.   * eax = 68 - function number
  3533.   * ebx = 25 - subfunction number
  3534.   * ecx = signal number
  3535.   * edx = value of activity (0/1)
  3536. Returned value:
  3537.   * eax = -1 - invalid signal number
  3538.   * otherwise eax = old value of activity for this signal (0/1)
  3539. Remarks:
  3540.   * In current implementation only mask for user excepton handler,
  3541.     which has been previously set by subfunction 24,
  3542.     is changed. Signal number corresponds to exception number.
  3543.  
  3544. ======================================================================
  3545. ====== Function 68, subfunction 26 - release memory pages ============
  3546. ======================================================================
  3547. Parameters:
  3548.   * eax = 68 - function number
  3549.   * ebx = 26 - subfunction number
  3550.   * ecx = pointer to the memory block, allocated by subfunction 12
  3551.   * edx = offset from the block beginnings
  3552.   * esi = the size of the region of memory to release, in bytes
  3553. Remarks:
  3554.   * function release range of pages from ecx+edx to ecx+edx+esi
  3555.     and set virtual memory into reserved state.
  3556.  
  3557. ======================================================================
  3558. ========== Function 68, subfunction 27 - load file ===================
  3559. ======================================================================
  3560. Parameters:
  3561.   * eax = 68 - function number
  3562.   * ebx = 27 - subfunction number
  3563.   * ecx = pointer to ASCIIZ-string with the filename
  3564. Returned value:
  3565.   * eax = pointer to the loaded file, or zero
  3566.   * edx = size of the loaded file, or zero
  3567. Remarks:
  3568.   * function loads file and unpacks, if necessary
  3569.  
  3570. ======================================================================
  3571. ====================== Function 69 - debugging. ======================
  3572. ======================================================================
  3573. A process can load other process as debugged by set of corresponding
  3574. bit by call to subfunction 7 of function 70.
  3575. A process can have only one debugger; one process can debug some
  3576. others. The system notifies debugger on events occuring with
  3577. debugged process. Messages are written to the buffer defined by
  3578. subfunction 0.
  3579. Format of a message:
  3580.   * +0: dword: message code
  3581.   * +4: dword: PID of debugged process
  3582.   * +8: there can be additional data depending on message code
  3583. Message codes:
  3584.   * 1 = exception
  3585.     * in addition dword-number of the exception is given
  3586.     * process is suspended
  3587.   * 2 = process has terminated
  3588.     * comes at any termination: both through the system function -1,
  3589.       and at "murder" by any other process (including debugger itself)
  3590.   * 3 = debug exception int 1 = #DB
  3591.     * in addition dword-image of the register DR6 is given:
  3592.       * bits 0-3: condition of the corresponding breakpoint (set by
  3593.         subfunction 9) is satisfied
  3594.       * bit 14: exception has occured because of the trace mode
  3595.         (flag TF is set TF)
  3596.     * process is suspended
  3597. When debugger terminates, all debugged processes are killed.
  3598. If debugger does not want this, it must previously detach by
  3599. subfunction 3.
  3600.  
  3601. All subfunctions are applicable only to processes/threads started
  3602. from the current by function 70 with set debugging flag.
  3603. Debugging of multithreaded programs is not supported yet.
  3604. The full list of subfunctions:
  3605.   * subfunction 0 - define data area for debug messages
  3606.   * subfunction 1 - get contents of registers of debugged thread
  3607.   * subfunction 2 - set contents of registers of debugged thread
  3608.   * subfunction 3 - detach from debugged process
  3609.   * subfunction 4 - suspend debugged thread
  3610.   * subfunction 5 - resume debugged thread
  3611.   * subfunction 6 - read from the memory of debugged process
  3612.   * subfunction 7 - write to the memory of debugged process
  3613.   * subfunction 8 - terminate debugged thread
  3614.   * subfunction 9 - set/clear hardware breakpoint
  3615.  
  3616. ======================================================================
  3617. = Function 69, subfunction 0 - define data area fror debug messages. =
  3618. ======================================================================
  3619. Parameters:
  3620.   * eax = 69 - function number
  3621.   * ebx = 0 - subfunction number
  3622.   * ecx = pointer
  3623. Format of data area:
  3624.   * +0: dword: N = buffer size (not including this header)
  3625.   * +4: dword: occupied place
  3626.   * +8: N*byte: buffer
  3627. Returned value:
  3628.   * function does not return value
  3629. Remarks:
  3630.   * If the size field is negative, the buffer is considered locked
  3631.     and at arrival of new message the system will wait.
  3632.     For synchronization frame all work with the buffer by operations
  3633.     lock/unlock
  3634.         neg     [bufsize]
  3635.   * Data in the buffer are considered as array of items with variable
  3636.     length - messages. Format of a message is explained in
  3637.     general description.
  3638.  
  3639. ======================================================================
  3640. ===================== Function 69, subfunction 1 =====================
  3641. ============ Get contents of registers of debugged thread. ===========
  3642. ======================================================================
  3643. Parameters:
  3644.   * eax = 69 - function number
  3645.   * ebx = 1 - subfunction number
  3646.   * ecx = thread identifier
  3647.   * edx = size of context structure, must be 0x28=40 bytes
  3648.   * esi = pointer to context structure
  3649. Returned value:
  3650.   * function does not return value
  3651. Format of context structure: (FPU is not supported yet)
  3652.   * +0: dword: eip
  3653.   * +4: dword: eflags
  3654.   * +8: dword: eax
  3655.   * +12 = +0xC: dword: ecx
  3656.   * +16 = +0x10: dword: edx
  3657.   * +20 = +0x14: dword: ebx
  3658.   * +24 = +0x18: dword: esp
  3659.   * +28 = +0x1C: dword: ebp
  3660.   * +32 = +0x20: dword: esi
  3661.   * +36 = +0x24: dword: edi
  3662. Remarks:
  3663.   * If the thread executes code of ring-0, the function returns
  3664.     contents of registers of ring-3.
  3665.   * Process must be loaded for debugging (as is shown in
  3666.     general description).
  3667.  
  3668. ======================================================================
  3669. ===================== Function 69, subfunction 2 =====================
  3670. ============ Set contents of registers of debugged thread. ===========
  3671. ======================================================================
  3672. Parameters:
  3673.   * eax = 69 - function number
  3674.   * ebx = 2 - subfunction number
  3675.   * ecx = thread identifier
  3676.   * edx = size of context structure, must be 0x28=40 bytes
  3677. Returned value:
  3678.   * function does not return value
  3679. Format of context structure is shown in the description of
  3680. subfunction 1.
  3681. Remarks:
  3682.   * If the thread executes code of ring-0, the function returns
  3683.     contents of registers of ring-3.
  3684.   * Process must be loaded for debugging (as is shown in
  3685.     general description).
  3686.  
  3687. ======================================================================
  3688. ===== Function 69, subfunction 3 - detach from debugged process. =====
  3689. ======================================================================
  3690. Parameters:
  3691.   * eax = 69 - function number
  3692.   * ebx = 3 - subfunction number
  3693.   * ecx = identifier
  3694. Returned value:
  3695.   * function does not return value
  3696. Remarks:
  3697.   * If the process was suspended, it resumes execution.
  3698.  
  3699. ======================================================================
  3700. ======== Function 69, subfunction 4 - suspend debugged thread. =======
  3701. ======================================================================
  3702. Parameters:
  3703.   * eax = 69 - function number
  3704.   * ebx = 4 - subfunction number
  3705.   * ecx = thread identifier
  3706. Returned value:
  3707.   * function does not return value
  3708. Remarks:
  3709.   * Process must be loaded for debugging (as is shown in
  3710.     general description).
  3711.  
  3712. ======================================================================
  3713. ======== Function 69, subfunction 5 - resume debugged thread. ========
  3714. ======================================================================
  3715. Parameters:
  3716.   * eax = 69 - function number
  3717.   * ebx = 5 - subfunction number
  3718.   * ecx = thread identifier
  3719. Returned value:
  3720.   * function does not return value
  3721. Remarks:
  3722.   * Process must be loaded for debugging (as is shown in
  3723.     general description).
  3724.  
  3725. ======================================================================
  3726. = Fucntion 69, subfunction 6 - read from memory of debugged process. =
  3727. ======================================================================
  3728. Parameters:
  3729.   * eax = 69 - function number
  3730.   * ebx = 6 - subfunction number
  3731.   * ecx = identifier
  3732.   * edx = number of bytes to read
  3733.   * esi = address in the memory of debugged process
  3734.   * edi = pointer to buffer for data
  3735. Returned value:
  3736.   * eax = -1 at an error (invalid PID or buffer)
  3737.   * otherwise eax = number of read bytes (possibly, 0,
  3738.     if esi is too large)
  3739. Remarks:
  3740.   * Process must be loaded for debugging (as is shown in
  3741.     general description).
  3742.  
  3743. ======================================================================
  3744. == Function 69, subfunction 7 - write to memory of debugged process. =
  3745. ======================================================================
  3746. Parameters:
  3747.   * eax = 69 - function number
  3748.   * ebx = 7 - subfunction number
  3749.   * ecx = identifier
  3750.   * edx = number of bytes to write
  3751.   * esi = address of memory in debugged process
  3752.   * edi = pointer to data
  3753. Returned value:
  3754.   * eax = -1 at an error (invalid PID or buffer)
  3755.   * otherwise eax = number of written bytes (possibly, 0,
  3756.     if esi is too large)
  3757. Remarks:
  3758.   * Process must be loaded for debugging (as is shown in
  3759.     general description).
  3760.  
  3761. ======================================================================
  3762. ======= Function 69, subfunction 8 - terminate debugged thread. ======
  3763. ======================================================================
  3764. Parameters:
  3765.   * eax = 69 - function number
  3766.   * ebx = 8 - subfunction number
  3767.   * ecx = identifier
  3768. Returned value:
  3769.   * function does not return value
  3770. Remarks:
  3771.   * Process must be loaded for debugging (as is shown in
  3772.     general description).
  3773.   * The function is similar to subfunction 2 of function 18
  3774.     with two differences: it requires first remark and
  3775.     accepts PID rather than slot number.
  3776.  
  3777. ======================================================================
  3778. ===== Function 69, subfunction 9 - set/clear hardware breakpoint. ====
  3779. ======================================================================
  3780. Parameters:
  3781.   * eax = 69 - function number
  3782.   * ebx = 9 - subfunction number
  3783.   * ecx = thread identifier
  3784.   * dl = index of breakpoint, from 0 to 3 inclusively
  3785.   * dh = flags:
  3786.     * if high bit is cleared - set breakpoint:
  3787.       * bits 0-1 - condition:
  3788.         * 00 = breakpoint on execution
  3789.         * 01 = breakpoint on read
  3790.         * 11 = breakpoint on read/write
  3791.       * bits 2-3 - length; for breakpoints on exception it must be
  3792.         00, otherwise one of
  3793.         * 00 = byte
  3794.         * 01 = word
  3795.         * 11 = dword
  3796.       * esi = breakpoint address; must be aligned according to
  3797.         the length (i.e. must be even for word breakpoints,
  3798.         divisible by 4 for dword)
  3799.     * if high bit is set - clear breakpoint
  3800. Returned value:
  3801.   * eax = 0 - success
  3802.   * eax = 1 - error in the input data
  3803.   * eax = 2 - (reserved, is never returned in the current
  3804.     implementation) a global breakpoint with that index is already set
  3805. Remarks:
  3806.   * Process must be loaded for debugging (as is shown in
  3807.     general description).
  3808.   * Hardware breakpoints are implemented through DRx-registers of
  3809.     the processor, all limitations results from this.
  3810.   * The function can reinstall the breakpoint, previously set
  3811.     by it (and it does not inform on this).
  3812.     Carry on the list of set breakpoints in the debugger.
  3813.   * Breakpoints generate debug exception #DB, on which the system
  3814.     notifies debugger.
  3815.   * Breakpoints on write and read/write act after
  3816.     execution of the caused it instruction.
  3817.  
  3818. ======================================================================
  3819. ==== Function 70 - work with file system with long names support. ====
  3820. ======================================================================
  3821. Parameters:
  3822.   * eax = 70
  3823.   * ebx = pointer to the information structure
  3824. Returned value:
  3825.   * eax = 0 - success; otherwise file system error code
  3826.   * some subfunctions return value in other registers too
  3827. General format of the information structure:
  3828.   * +0: dword: subfunction number
  3829.   * +4: dword: file offset
  3830.   * +8: dword: high dword of offset (must be 0) or flags field
  3831.   * +12 = +0xC: dword: size
  3832.   * +16 = +0x10: dword: pointer to data
  3833.   * +20 = +0x14: n db: ASCIIZ-string with the filename
  3834.     or
  3835.   * +20 = +0x14: db 0
  3836.   * +21 = +0x15: dd pointer to ASCIIZ-string with the filename
  3837. Specifications - in documentation on the appropriate subfunction.
  3838. Filename is case-insensitive. Russian letters must be written in
  3839. the encoding cp866 (DOS).
  3840. Format of filename:
  3841. /base/number/dir1/dir2/.../dirn/file,
  3842. where /base/number identifies device, on which file is located:
  3843. one of
  3844.   * /RD/1 = /RAMDISK/1 to access ramdisk
  3845.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  3846.     /FD/2 = /FLOPPYDISK/2 to access second one
  3847.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  3848.     IDE0 (Primary Master), IDE1 (Primary Slave),
  3849.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  3850.     x - partition number on the selected hard drive, varies from 1
  3851.     to 255 (on each hard drive the indexing starts from 1)
  3852.   * /CD0/1, /CD1/1, /CD2/1, /CD3/1 to access accordingly to
  3853.     CD on IDE0 (Primary Master), IDE1 (Primary Slave),
  3854.     IDE2 (Secondary Master), IDE3 (Secondary Slave)
  3855.   * /SYS means system folder; with the usual boot (from floppy)
  3856.     is equivalent to /RD/1
  3857. Examples:
  3858.   * '/rd/1/kernel.asm',0
  3859.   * '/HD0/1/kernel.asm',0
  3860.   * '/hd0/2/menuet/pics/tanzania.bmp',0
  3861.   * '/hd0/1/Program files/NameOfProgram/SomeFile.SomeExtension',0
  3862.   * '/sys/MySuperApp.ini',0
  3863. Also function supports relative names.  If the path begins not
  3864. with '/', it is considered relative to a current folder. To get or
  3865. set a current folder, use the function 30.
  3866.  
  3867. Available subfunctions:
  3868.   * subfunction 0 - read file
  3869.   * subfunction 1 - read folder
  3870.   * subfunction 2 - create/rewrite file
  3871.   * subfunction 3 - write to existing file
  3872.   * subfunction 4 - set file size
  3873.   * subfunction 5 - get attributes of file/folder
  3874.   * subfunction 6 - set attributes of file/folder
  3875.   * subfunction 7 - start application
  3876.   * subfunction 8 - delete file/folder
  3877.   * subfunction 9 - create folder
  3878. For CD-drives due to hardware limitations only subfunctions
  3879. 0,1,5 and 7 are available, other subfunctions return error
  3880. with code 2.
  3881. At the first call of subfunctions 0,1,5,7 to ATAPI devices
  3882. (CD and DVD) the manual control of tray is locked due to caching
  3883. drive data. Unlocking is made when subfunction 4 of function 24
  3884. is called for corresponding device.
  3885.  
  3886. ======================================================================
  3887. === Function 70, subfunction 0 - read file with long names support. ==
  3888. ======================================================================
  3889. Parameters:
  3890.   * eax = 70 - function number
  3891.   * ebx = pointer to the information structure
  3892. Format of the information structure:
  3893.   * +0: dword: 0 = subfunction number
  3894.   * +4: dword: file offset (in bytes)
  3895.   * +8: dword: 0 (reserved for high dword of offset)
  3896.   * +12 = +0xC: dword: number of bytes to read
  3897.   * +16 = +0x10: dword: pointer to buffer for data
  3898.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  3899.     given in the general description
  3900.     or
  3901.   * +20 = +0x14: db 0
  3902.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  3903. Returned value:
  3904.   * eax = 0 - success, otherwise file system error code
  3905.   * ebx = number of read bytes or -1=0xffffffff if file was not found
  3906. Remarks:
  3907.   * If file was ended before last requested block was read,
  3908.     the function will read as many as it can, and after that return
  3909.     eax=6 (EOF).
  3910.   * The function does not allow to read folder (returns eax=10,
  3911.     access denied).
  3912.  
  3913. ======================================================================
  3914. == Function 70, subfunction 1 - read folder with long names support. =
  3915. ======================================================================
  3916. Parameters:
  3917.   * eax = 70 - function number
  3918.   * ebx = pointer to the information structure
  3919. Format of the information structure:
  3920.   * +0: dword: 1 = subfunction number
  3921.   * +4: dword: index of starting block (beginning from 0)
  3922.   * +8: dword: flags field:
  3923.     * bit 0 (mask 1): in what format to return names,
  3924.       0=ANSI, 1=UNICODE
  3925.     * other bits are reserved and must be set to 0 for the future
  3926.       compatibility
  3927.   * +12 = +0xC: dword: number of blocks to read
  3928.   * +16 = +0x10: dword: pointer to buffer for data, buffer size
  3929.     must be not less than 32 + [+12]*560 bytes
  3930.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  3931.     given in the general description
  3932.     or
  3933.   * +20 = +0x14: db 0
  3934.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  3935. Returned value:
  3936.   * eax = 0 - success, otherwise file system error code
  3937.   * ebx = number of files, information on which was written to
  3938.     the buffer, or -1=0xffffffff, if folder was not found
  3939. Structure of the buffer:
  3940.   * +0: 32*byte: header
  3941.   * +32 = +0x20: n1*byte: block with information on file 1
  3942.   * +32+n1: n2*byte: block with information on file 2
  3943.   * ...
  3944. Structure of header:
  3945.   * +0: dword: version of structure (current is 1)
  3946.   * +4: dword: number of placed blocks; is not greater than requested
  3947.     in the field +12 of information structure; can be less, if
  3948.     there are no more files in folder (the same as in ebx)
  3949.   * +8: dword: total number of files in folder
  3950.   * +12 = +0xC: 20*byte: reserved (zeroed)
  3951. Structure of block of data for folder entry (BDFE):
  3952.   * +0: dword: attributes of file:
  3953.     * bit 0 (mask 1): file is read-only
  3954.     * bit 1 (mask 2): file is hidden
  3955.     * bit 2 (mask 4): file is system
  3956.     * bit 3 (mask 8): this is not a file but volume label
  3957.       (for one partition meets no more than once and
  3958.       only in root folder)
  3959.     * bit 4 (mask 0x10): this is a folder
  3960.     * bit 5 (mask 0x20): file was not archived - many archivation
  3961.       programs have an option to archive only files with this bit set,
  3962.       and after archiving this bit is cleared - it can be useful
  3963.       for automatically creating of backup-archives as at writing
  3964.       this bit is usually set
  3965.   * +4: byte: type of name data:
  3966.     (coincides with bit 0 of flags in the information structure)
  3967.     * 0 = ASCII = 1-byte representation of each character
  3968.     * 1 = UNICODE = 2-byte representation of each character
  3969.   * +5: 3*byte: reserved (zero)
  3970.   * +8: 4*byte: time of file creation
  3971.   * +12 = +0xC: 4*byte: date of file creation
  3972.   * +16 = +0x10: 4*byte: time of last access (read or write)
  3973.   * +20 = +0x14: 4*byte: date of last access
  3974.   * +24 = +0x18: 4*byte: time of last modification
  3975.   * +28 = +0x1C: 4*byte: date of last modification
  3976.   * +32 = +0x20: qword: file size in bytes (up to 16777216 Tb)
  3977.   * +40 = +0x28: name
  3978.     * for ASCII format: maximum length is 263 characters
  3979.       (263 bytes), byte after the name has value 0
  3980.     * for UNICODE format: maximum length is 259 characters
  3981.       (518 bytes), 2 bytes after the name have value 0
  3982. Time format:
  3983.   * +0: byte: seconds
  3984.   * +1: byte: minutes
  3985.   * +2: byte: hours
  3986.   * +3: byte: reserved (0)
  3987.   * for example, 23.59.59 is written as (in hex) 3B 3B 17 00
  3988. Date format:
  3989.   * +0: byte: day
  3990.   * +1: byte: month
  3991.   * +2: word: year
  3992.   * for example, 25.11.1979 is written as (in hex) 19 0B BB 07
  3993. Remarks:
  3994.   * If BDFE contains ASCII name, the length of BDFE is 304 bytes,
  3995.     if UNICODE name - 560 bytes. Value of length is aligned
  3996.     on 16-byte bound (to accelerate processing in CPU cache).
  3997.   * First character after a name is zero (ASCIIZ-string). The further
  3998.     data contain garbage.
  3999.   * If files in folder were ended before requested number was read,
  4000.     the function will read as many as it can, and after that return
  4001.     eax=6 (EOF).
  4002.   * Any folder on the disk, except for root, contains two special
  4003.     entries "." and "..", identifying accordingly the folder itself
  4004.     and the parent folder.
  4005.   * The function allows also to read virtual folders "/", "/rd",
  4006.     "/fd", "/hd[n]", thus attributes of subfolders are set to 0x10,
  4007.     and times and dates are zeroed. An alternative way to get the
  4008.     equipment information - subfunction 11 of function 18.
  4009.  
  4010. ======================================================================
  4011. ===================== Function 70, subfunction 2 =====================
  4012. ============ Create/rewrite file with long names support. ============
  4013. ======================================================================
  4014. Parameters:
  4015.   * eax = 70 - function number
  4016.   * ebx = pointer to the information structure
  4017. Format of the information structure:
  4018.   * +0: dword: 2 = subfunction number
  4019.   * +4: dword: 0 (reserved)
  4020.   * +8: dword: 0 (reserved)
  4021.   * +12 = +0xC: dword: number of bytes to write
  4022.   * +16 = +0x10: dword: pointer to data
  4023.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4024.     given in the general description
  4025.     or
  4026.   * +20 = +0x14: db 0
  4027.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4028. Returned value:
  4029.   * eax = 0 - success, otherwise file system error code
  4030.   * ebx = number of written bytes (possibly 0)
  4031. Remarks:
  4032.   * If a file with given name did not exist, it is created;
  4033.     if it existed, it is rewritten.
  4034.   * If there is not enough free space on disk, the function will
  4035.     write as many as can and then return error code 8.
  4036.   * The function is not supported for CD (returns error code 2).
  4037.  
  4038. ======================================================================
  4039. ===================== Function 70, subfunction 3 =====================
  4040. =========== Write to existing file with long names support. ==========
  4041. ======================================================================
  4042. Parameters:
  4043.   * eax = 70 - function number
  4044.   * ebx = pointer to the information structure
  4045. Format of the information structure:
  4046.   * +0: dword: 3 = subfunction number
  4047.   * +4: dword: file offset (in bytes)
  4048.   * +8: dword: high dword of offset (must be 0 for FAT)
  4049.   * +12 = +0xC: dword: number of bytes to write
  4050.   * +16 = +0x10: dword: pointer to data
  4051.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4052.     given in the general description
  4053.     or
  4054.   * +20 = +0x14: db 0
  4055.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4056. Returned value:
  4057.   * eax = 0 - success, otherwise file system error code
  4058.   * ebx = number of written bytes (possibly 0)
  4059. Remarks:
  4060.   * The file must already exist, otherwise function returns eax=5.
  4061.   * The only result of write 0 bytes is update in the file attributes
  4062.     date/time of modification and access to the current date/time.
  4063.   * If beginning and/or ending position is greater than file size
  4064.     (except for the previous case), the file is expanded to needed
  4065.     size with zero characters.
  4066.   * The function is not supported for CD (returns error code 2).
  4067.  
  4068. ======================================================================
  4069. ============ Function 70, subfunction 4 - set end of file. ===========
  4070. ======================================================================
  4071. Parameters:
  4072.   * eax = 70 - function number
  4073.   * ebx = pointer to the information structure
  4074. Format of the information structure:
  4075.   * +0: dword: 4 = subfunction number
  4076.   * +4: dword: low dword of new file size
  4077.   * +8: dword: high dword of new file size (must be 0 for FAT)
  4078.   * +12 = +0xC: dword: 0 (reserved)
  4079.   * +16 = +0x10: dword: 0 (reserved)
  4080.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4081.     given in the general description
  4082.     or
  4083.   * +20 = +0x14: db 0
  4084.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4085. Returned value:
  4086.   * eax = 0 - success, otherwise file system error code
  4087.   * ebx destroyed
  4088. Remarks:
  4089.   * If the new file size is less than old one, file is truncated.
  4090.     If the new size is greater than old one, file is expanded with
  4091.     characters with code 0. If the new size is equal to old one,
  4092.     the only result of call is set date/time of modification and
  4093.     access to the current date/time.
  4094.   * If there is not enough free space on disk for expansion, the
  4095.     function will expand to maximum possible size and then return
  4096.     error code 8.
  4097.   * The function is not supported for CD (returns error code 2).
  4098.  
  4099. ======================================================================
  4100. ==== Function 70, subfunction 5 - get information on file/folder. ====
  4101. ======================================================================
  4102. Parameters:
  4103.   * eax = 70 - function number
  4104.   * ebx = pointer to the information structure
  4105. Format of the information structure:
  4106.   * +0: dword: 5 = subfunction number
  4107.   * +4: dword: 0 (reserved)
  4108.   * +8: dword: 0 (reserved)
  4109.   * +12 = +0xC: dword: 0 (reserved)
  4110.   * +16 = +0x10: dword: pointer to buffer for data (40 bytes)
  4111.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4112.     given in the general description
  4113.     or
  4114.   * +20 = +0x14: db 0
  4115.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4116. Returned value:
  4117.   * eax = 0 - success, otherwise file system error code
  4118.   * ebx destroyed
  4119. Information on file is returned in the BDFE format (block of data
  4120. for folder entry), explained in the description of
  4121. subfunction 1, but without filename
  4122. (i.e. only first 40 = 0x28 bytes).
  4123. Remarks:
  4124.   * The function does not support virtual folders such as /, /rd and
  4125.     root folders like /rd/1.
  4126.  
  4127. ======================================================================
  4128. ===== Function 70, subfunction 6 - set attributes of file/folder. ====
  4129. ======================================================================
  4130. Parameters:
  4131.   * eax = 70 - function number
  4132.   * ebx = pointer to the information structure
  4133. Format of the information structure:
  4134.   * +0: dword: 6 = subfunction number
  4135.   * +4: dword: 0 (reserved)
  4136.   * +8: dword: 0 (reserved)
  4137.   * +12 = +0xC: dword: 0 (reserved)
  4138.   * +16 = +0x10: dword: pointer to buffer with attributes (32 bytes)
  4139.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4140.     given in the general description
  4141.     or
  4142.   * +20 = +0x14: db 0
  4143.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4144. Returned value:
  4145.   * eax = 0 - success, otherwise file system error code
  4146.   * ebx destroyed
  4147. File attributes are first 32 bytes in BDFE (block of data
  4148. for folder entry), explained in the description of subfunction 1
  4149. (that is, without name and size of file). Attribute
  4150. file/folder/volume label (bits 3,4 in dword +0) is not changed.
  4151. Byte +4 (name format) is ignored.
  4152. Remarks:
  4153.   * The function does not support virtual folders such as /, /rd and
  4154.     root folders like /rd/1.
  4155.   * The function is not supported for CD (returns error code 2).
  4156.  
  4157. ======================================================================
  4158. =========== Function 70, subfunction 7 - start application. ==========
  4159. ======================================================================
  4160. Parameters:
  4161.   * eax = 70 - function number
  4162.   * ebx = pointer to the information structure
  4163. Format of the information structure:
  4164.   * +0: dword: 7 = subfunction number
  4165.   * +4: dword: flags field:
  4166.     * bit 0: start process as debugged
  4167.     * other bits are reserved and must be set to 0
  4168.   * +8: dword: 0 or pointer to ASCIIZ-string with parameters
  4169.   * +12 = +0xC: dword: 0 (reserved)
  4170.   * +16 = +0x10: dword: 0 (reserved)
  4171.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4172.     given in the general description
  4173.     or
  4174.   * +20 = +0x14: db 0
  4175.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4176. Returned value:
  4177.   * eax > 0 - program is loaded, eax contains PID
  4178.   * eax < 0 - an error has occured, -eax contains
  4179.     file system error code
  4180.   * ebx destroyed
  4181. Remarks:
  4182.   * Command line must be terminated by the character with the code 0
  4183.     (ASCIIZ-string); function takes into account either all characters
  4184.     up to terminating zero inclusively or first 256 character
  4185.     regarding what is less.
  4186.   * If the process is started as debugged, it is created in
  4187.     the suspended state; to run use subfunction 5 of function 69.
  4188.  
  4189. ======================================================================
  4190. ========== Function 70, subfunction 8 - delete file/folder. ==========
  4191. ======================================================================
  4192. Parameters:
  4193.   * eax = 70 - function number
  4194.   * ebx = pointer to the information structure
  4195. Format of the information structure:
  4196.   * +0: dword: 8 = subfunction number
  4197.   * +4: dword: 0 (reserved)
  4198.   * +8: dword: 0 (reserved)
  4199.   * +12 = +0xC: dword: 0 (reserved)
  4200.   * +16 = +0x10: dword: 0 (reserved)
  4201.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4202.     given in the general description
  4203.     or
  4204.   * +20 = +0x14: db 0
  4205.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4206. Returned value:
  4207.   * eax = 0 - success, otherwise file system error code
  4208.   * ebx destroyed
  4209. Remarks:
  4210.   * The function is not supported for CD (returns error code 2).
  4211.   * The function can delete only empty folders (attempt to delete
  4212.     nonempty folder results in error with code 10, "access denied").
  4213.  
  4214. ======================================================================
  4215. ============= Function 70, subfunction 9 - create folder. ============
  4216. ======================================================================
  4217. Parameters:
  4218.   * eax = 70 - function number
  4219.   * ebx = pointer to the information structure
  4220. Format of the information structure:
  4221.   * +0: dword: 9 = subfunction number
  4222.   * +4: dword: 0 (reserved)
  4223.   * +8: dword: 0 (reserved)
  4224.   * +12 = +0xC: dword: 0 (reserved)
  4225.   * +16 = +0x10: dword: 0 (reserved)
  4226.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  4227.     given in the general description
  4228.     or
  4229.   * +20 = +0x14: db 0
  4230.   * +21 = +0x15: dd pointer to ASCIIZ-string with folder name
  4231. Returned value:
  4232.   * eax = 0 - success, otherwise file system error code
  4233.   * ebx destroyed
  4234. Remarks:
  4235.   * The function is not supported for CD (returns error code 2).
  4236.   * The parent folder must already exist.
  4237.   * If target folder already exists, function returns success (eax=0).
  4238.  
  4239. ======================================================================
  4240. ========== Function 71, subfunction 1 - set window caption. ==========
  4241. ======================================================================
  4242. Parameters:
  4243.   * eax = 71 - function number
  4244.   * ebx = 1 - subfunction number
  4245.   * ecx = pointer to caption string
  4246. Returned value:
  4247.   * function does not return value
  4248. Remarks:
  4249.   * String must be in the ASCIIZ-format. Disregarding real string
  4250.     length, no more than 255 characters are drawn.
  4251.   * Pass NULL in ecx to remove caption.
  4252.  
  4253. ======================================================================
  4254. =============== Function 72 - send message to a window. ==============
  4255. ======================================================================
  4256.  
  4257. - Subfunction 1 - send message with parameter to the active window. --
  4258. Parameters:
  4259.   * eax = 72 - function number
  4260.   * ebx = 1 - subfunction number
  4261.   * ecx = event code: 2 or 3
  4262.   * edx = parameter: key code for ecx=2, button identifier for ecx=3
  4263. Returned value:
  4264.   * eax = 0 - success
  4265.   * eax = 1 - buffer is full
  4266.  
  4267. ======================================================================
  4268. ===================== Function 73 - blit bitmap  =====================
  4269. ======================================================================
  4270.  
  4271. Parameters:
  4272.   * eax = 73 - function number
  4273.  
  4274.   * ebx = ROP and optional flags
  4275.      31           6 5  4 3   0
  4276.      [  reserved  ][T][B][ROP]
  4277.      ROP - raster operation code
  4278.         0: Copy
  4279.      1-15: reserved
  4280.      B   - blit into the background surface
  4281.      T   - transparent blit
  4282.  
  4283.   * ecx = pointer to the function parameters
  4284.         destination offset and clipping
  4285.      +0 signed dword: destination rectangle X offset from the window
  4286.                       top-left corner
  4287.      +4 signed dword: destination rectangle Y offset from the window
  4288.                       top-left corner
  4289.      +8 dword:        destination rectangle width
  4290.     +12 dword:        destination rectangle height
  4291.  
  4292.         source offset and clipping
  4293.     +16 signed dword: source rectangle X offset from the bitmap
  4294.                       top-left corner
  4295.     +20 signed dword: source rectangle Y offset from the bitmap
  4296.                       top-left corner
  4297.     +24 dword:        source rectangle width
  4298.     +28 dword:        source rectangle height
  4299.  
  4300.     +32: dword: bitmap data - must be 32bpp
  4301.     +36: dword: size of the bitmap row in bytes
  4302.  
  4303. Returned value:
  4304.   * function does not return value
  4305.  
  4306. ======================================================================
  4307. = Function 74, Subfunction -1, Get number of active network devices. =
  4308. ======================================================================
  4309. Parameters:
  4310.   * eax = 74 - function number
  4311.   * bl = -1 - subfunction number
  4312. Returned value:
  4313.   * eax = number of active network devices
  4314.  
  4315. ======================================================================
  4316. ======== Function 74, Subfunction 0, Get network device type. ========
  4317. ======================================================================
  4318. Parameters:
  4319.   * eax = 74 - function number
  4320.   * bl = 0 - subfunction number
  4321.   * bh = device number
  4322. Returned value:
  4323.   * eax = device type
  4324.  
  4325. ======================================================================
  4326. ======== Function 74, Subfunction 1, Get network device name. ========
  4327. ======================================================================
  4328. Parameters:
  4329.   * eax = 74 - function number
  4330.   * bl = 1 - subfunction number
  4331.   * bh = device number
  4332.   * ecx = pointer to 64 byte buffer
  4333. Returned value:
  4334.   * eax = -1 on error
  4335.   * The network device name is written into the buffer, on success
  4336.  
  4337. ======================================================================
  4338. ========= Function 74, Subfunction 2, Reset network device. ==========
  4339. ======================================================================
  4340. Parameters:
  4341.   * eax = 74 - function number
  4342.   * bl = 2 - subfunction number
  4343.   * bh = device number
  4344. Returned value:
  4345.   * eax = -1 on error
  4346.  
  4347. ======================================================================
  4348. ========== Function 74, Subfunction 3, Stop network device. ==========
  4349. ======================================================================
  4350. Parameters:
  4351.   * eax = 74 - function number
  4352.   * bl = 3 - subfunction number
  4353.   * bh = device number
  4354. Returned value:
  4355.   * eax = -1 on error
  4356.  
  4357. ======================================================================
  4358. ============== Function 75, Subfunction 0, Open socket. ==============
  4359. ======================================================================
  4360. Parameters:
  4361.   * eax = 75 - function number
  4362.   * bl = 0 - subfunction number
  4363.   * ecx = domain
  4364.   * edx = type
  4365.   * esi = protocol
  4366. Returned value:
  4367.   * eax = socket number, -1 on error
  4368.   * ebx = errorcode
  4369.  
  4370. ======================================================================
  4371. ============= Function 75, Subfunction 1, Close socket. ==============
  4372. ======================================================================
  4373. Parameters:
  4374.   * eax = 75 - function number
  4375.   * bl = 1 - subfunction number
  4376.   * ecx = socket number
  4377. Returned value:
  4378.   * eax = -1 on error
  4379.   * ebx = errorcode
  4380.  
  4381. ======================================================================
  4382. ================== Function 75, Subfunction 2, Bind. =================
  4383. ======================================================================
  4384. Parameters:
  4385.   * eax = 75 - function number
  4386.   * bl = 2 - subfunction number
  4387.   * ecx = socket number
  4388.   * edx = pointer to sockaddr structure
  4389.   * esi = length of sockaddr structure
  4390. Returned value:
  4391.   * eax = -1 on error
  4392.   * ebx = errorcode
  4393.  
  4394. ======================================================================
  4395. ================= Function 75, Subfunction 3, Listen. ================
  4396. ======================================================================
  4397. Parameters:
  4398.   * eax = 75 - function number
  4399.   * bl = 3 - subfunction number
  4400.   * ecx = socket number
  4401.   * edx = backlog
  4402. Returned value:
  4403.   * eax = -1 on error
  4404.   * ebx = errorcode
  4405.  
  4406. ======================================================================
  4407. ================ Function 75, Subfunction 4, Connect. ================
  4408. ======================================================================
  4409. Parameters:
  4410.   * eax = 75 - function number
  4411.   * bl = 4 - subfunction number
  4412.   * ecx = socket number
  4413.   * edx = pointer to sockaddr structure
  4414.   * esi = length of sockaddr structure
  4415. Returned value:
  4416.   * eax = -1 on error
  4417.   * ebx = errorcode
  4418.  
  4419. ======================================================================
  4420. ================= Function 75, Subfunction 5, Accept. ================
  4421. ======================================================================
  4422. Parameters:
  4423.   * eax = 75 - function number
  4424.   * bl = 5 - subfunction number
  4425.   * ecx = socket number
  4426.   * edx = pointer to sockaddr structure
  4427.   * esi = length of sockaddr structure
  4428. Returned value:
  4429.   * eax = socket number of accepted socket, -1 on error
  4430.   * ebx = errorcode
  4431.  
  4432. ======================================================================
  4433. ================== Function 75, Subfunction 6, Send. =================
  4434. ======================================================================
  4435. Parameters:
  4436.   * eax = 75 - function number
  4437.   * bl = 6 - subfunction number
  4438.   * ecx = socket number
  4439.   * edx = pointer to buffer
  4440.   * esi = length of buffer
  4441.   * edi = flags
  4442. Returned value:
  4443.   * eax = number of bytes copied, -1 on error
  4444.   * ebx = errorcode
  4445.  
  4446. ======================================================================
  4447. ================ Function 75, Subfunction 7, Receive. ================
  4448. ======================================================================
  4449. Parameters:
  4450.   * eax = 75 - function number
  4451.   * bl = 7 - subfunction number
  4452.   * ecx = socket number
  4453.   * edx = pointer to buffer
  4454.   * esi = length of buffer
  4455.   * edi = flags
  4456. Returned value:
  4457.   * eax = number of bytes copied, -1 on error
  4458.   * ebx = errorcode
  4459.  
  4460. ======================================================================
  4461. =========== Function 75, Subfunction 8, Set socket options. ==========
  4462. ======================================================================
  4463. Parameters:
  4464.   * eax = 75 - function number
  4465.   * bl = 8 - subfunction number
  4466.   * ecx = socket number
  4467.   * edx = pointer to optstruct
  4468. Returned value:
  4469.   * eax = -1 on error
  4470.   * ebx = errorcode
  4471. Remarks:
  4472.  
  4473.   Optstruct: dd level
  4474.              dd optionname
  4475.              dd optlength
  4476.              db options...
  4477.  
  4478. ======================================================================
  4479. =========== Function 75, Subfunction 9, Get socket options. ==========
  4480. ======================================================================
  4481. Parameters:
  4482.   * eax = 75 - function number
  4483.   * bl = 9 - subfunction number
  4484.   * ecx = socket number
  4485.   * edx = pointer to optstruct
  4486. Returned value:
  4487.   * eax = -1 on error
  4488.   * ebx = errorcode
  4489. Remarks:
  4490.  
  4491.   Optstruct: dd level
  4492.              dd optionname
  4493.              dd optlength
  4494.              db options...
  4495.  
  4496. ======================================================================
  4497. ============ Function 75, Subfunction 10, Get socketpair. ===========
  4498. ======================================================================
  4499. Parameters:
  4500.   * eax = 75 - function number
  4501.   * bl = 10 - subfunction number
  4502. Returned value:
  4503.   * eax = socketnum1, -1 on error
  4504.   * ebx = socketnum2, errorcode on error
  4505. Remarks:
  4506.  
  4507.   Optstruct: dd level
  4508.              dd optionname
  4509.              dd optlength
  4510.              db options...
  4511.  
  4512. ======================================================================
  4513. =============== Function -1 - terminate thread/process ===============
  4514. ======================================================================
  4515. Parameters:
  4516.   * eax = -1 - function number
  4517. Returned value:
  4518.   * function does not return neither value nor control
  4519. Remarks:
  4520.   * If the process did not create threads obviously, it has only
  4521.     one thread, which termination results in process termination.
  4522.   * If the current thread is last in the process, its termination
  4523.     also results in process terminates.
  4524.   * This function terminates the current thread. Other thread can be
  4525.     killed by call to subfunction 2 of function 18.
  4526.  
  4527. ======================================================================
  4528. =========================== List of events ===========================
  4529. ======================================================================
  4530. Next event can be retrieved by the call of one from functions 10
  4531. (to wait for event), 11 (to check without waiting), 23
  4532. (to wait during the given time).
  4533. These functions return only those events, which enter into a mask set
  4534. by function 40. By default it is first three,
  4535. there is enough for most applications.
  4536. Codes of events:
  4537.   * 1 = redraw event (is reset by call to function 0)
  4538.   * 2 = key on keyboard is pressed (acts, only when the window is
  4539.     active) or hotkey is pressed; is reset, when all keys from
  4540.     the buffer are read out by function 2
  4541.   * 3 = button is pressed, defined earlier by function 8
  4542.     (or close button, created implicitly by function 0;
  4543.     minimize button is handled by the system and sends no message;
  4544.     acts, only when the window is active;
  4545.     is reset when all buttons from the buffer
  4546.     are read out by function 17)
  4547.   * 4 = reserved (in current implementation never comes even after
  4548.     unmasking by function 40)
  4549.   * 5 = kernel finished redrawing of the desktop background
  4550.   * 6 = mouse event (something happened - button pressing or moving;
  4551.     is reset at reading)
  4552.   * 7 = IPC event (see function 60 -
  4553.     Inter Process Communication; is reset at reading)
  4554.   * 8 = network event (is reset at reading)
  4555.   * 9 = debug event (is reset at reading; see
  4556.     debug subsystem)
  4557.   * 16..31 = event with appropriate IRQ
  4558.     (16=IRQ0, 31=IRQ15) (is reset after reading all IRQ data)
  4559.  
  4560. ======================================================================
  4561. =================== Error codes of the file system ===================
  4562. ======================================================================
  4563.   * 0 = success
  4564.   * 1 = base and/or partition of a hard disk is not defined
  4565.     (by subfunctions 7, 8 of function 21)
  4566.   * 2 = function is not supported for the given file system
  4567.   * 3 = unknown file system
  4568.   * 4 = reserved, is never returned in the current implementation
  4569.   * 5 = file not found
  4570.   * 6 = end of file, EOF
  4571.   * 7 = pointer lies outside of application memory
  4572.   * 8 = disk is full
  4573.   * 9 = FAT table is destroyed
  4574.   * 10 = access denied
  4575.   * 11 = device error
  4576. Application start functions can return also following errors:
  4577.   * 30 = 0x1E = not enough memory
  4578.   * 31 = 0x1F = file is not executable
  4579.   * 32 = 0x20 = too many processes
  4580.