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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=2)
  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
  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(25,ysize)) color indicated in esi
  86.       (taking a gradient into account)
  87.     * if ysize>=26, 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. Remarks:
  371.   * Slots are numbered starting from 1.
  372.   * Returned value is not a total number of threads, because there
  373.     can be free slots.
  374.   * When process is starting, system automatically creates
  375.     execution thread.
  376.   * Function gives information on the thread. Each process has
  377.     at least one thread. One process can create many threads,
  378.     in this case each thread has its own slot and the fields
  379.     +10, +22, +26 in these slots coincide.
  380.     Applications have no common way to define whether two threads
  381.     belong to one process.
  382.   * The active window - window on top of the window stack -
  383.     receives the messages on a keyboard input. For such window
  384.     the position in the window stack coincides with returned value.
  385.   * Slot 1 corresponds to special system thread, for which:
  386.     * the window is in the bottom of the window stack, the fields
  387.       +4 and +6 contain value 1
  388.     * name of the process - "OS/IDLE" (supplemented by spaces)
  389.     * address of the process in memory is 0, size of used memory is
  390.       16 Mb (0x1000000)
  391.     * PID=1
  392.     * coordinates and sizes of the window and the client area are by
  393.       convention set to 0
  394.     * status of the slot is always 0 (running)
  395.     * the execution time adds of time leaving on operations itself
  396.       and idle time in waiting for interrupt (which can be got by call
  397.       to subfunction 4 of function 18).
  398.   * Beginning from slot 2, the normal applications are placed.
  399.   * The normal applications are placed in memory at the address
  400.     0 (kernel constant 'std_application_base_address').
  401.     There is no intersection, as each process has its own page table.
  402.   * At creation of the thread it is assigned the slot
  403.     in the system table and identifier (Process/Thread IDentifier =
  404.     PID/TID), which do not vary with time for given thread.
  405.     After completion of the thread its slot can be anew used
  406.     for another thread. The thread identifier can not be assigned
  407.     to other thread even after completion of this thread.
  408.     Identifiers, assigned to new threads, grow monotonously.
  409.   * If the thread has not yet defined the window by call to
  410.     function 0, the position and the sizes
  411.     of its window are considered to be zero.
  412.   * Coordinates of the client area are relative to the window.
  413.   * At the moment only the part of the buffer by a size
  414.     71 = 0x37 bytes is used. Nevertheless it is recommended to use
  415.     1-Kb buffer for the future compatibility, in the future
  416.     some fields can be added.
  417.  
  418. ======================================================================
  419. ==================== Function 10 - wait for event. ===================
  420. ======================================================================
  421. If the message queue is empty, waits for appearance of the message
  422. in queue. In this state thread does not consume CPU time.
  423. Then reads out the message from queue.
  424.  
  425. Parameters:
  426.   * eax = 10 - function number
  427. Returned value:
  428.   * eax = event (see the list of events)
  429. Remarks:
  430.   * Those events are taken into account only which enter into
  431.     a mask set by function 40. By default it is
  432.     redraw, key and button events.
  433.   * To check, whether there is a message in queue, use function 11.
  434.     To wait for no more than given time, use function 23.
  435.  
  436. ======================================================================
  437. =============== Function 11 - check for event, no wait. ==============
  438. ======================================================================
  439. If the message queue contains event, function reads out
  440. and return it. If the queue is empty, function returns 0.
  441. Parameters:
  442.   * eax = 11 - function number
  443. Returned value:
  444.   * eax = 0 - message queue is empty
  445.   * else eax = event (see the list of events)
  446. Remarks:
  447.   * Those events are taken into account only, which enter into
  448.     a mask set by function 40. By default it is
  449.     redraw, key and button events.
  450.   * To wait for event, use function 10.
  451.     To wait for no more than given time, use function 23.
  452.  
  453. ======================================================================
  454. =============== Function 12 - begin/end window redraw. ===============
  455. ======================================================================
  456.  
  457. ---------------- Subfunction 1 - begin window redraw. ----------------
  458. Parameters:
  459.   * eax = 12 - function number
  460.   * ebx = 1 - subfunction number
  461. Returned value:
  462.   * function does not return value
  463.  
  464. ----------------- Subfunction 2 - end window redraw. -----------------
  465. Parameters:
  466.   * eax = 12 - function number
  467.   * ebx = 2 - subfunction number
  468. Returned value:
  469.   * function does not return value
  470. Remarks:
  471.   * Subfunction 1 deletes all buttons defined with
  472.     function 8, they must be defined again.
  473.  
  474. ======================================================================
  475. ============ Function 13 - draw a rectangle in the window. ===========
  476. ======================================================================
  477. Parameters:
  478.   * eax = 13 - function number
  479.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  480.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  481.   * edx = color 0xRRGGBB or 0x80RRGGBB for gradient fill
  482. Returned value:
  483.   * function does not return value
  484. Remarks:
  485.   * Coordinates are understood as coordinates of the left upper corner
  486.     of a rectangle relative to the window.
  487.  
  488. ======================================================================
  489. =================== Function 14 - get screen size. ===================
  490. ======================================================================
  491. Parameters:
  492.   * eax = 14 - function number
  493. Returned value:
  494.   * eax = [xsize]*65536 + [ysize], where
  495.   * xsize = x-coordinate of the right lower corner of the screen =
  496.             horizontal size - 1
  497.   * ysize = y-coordinate of the right lower corner of the screen =
  498.             vertical size - 1
  499. Remarks:
  500.   * See also subfunction 5 of function 48 - get sizes of
  501.     working area of the screen.
  502.  
  503. ======================================================================
  504. == Function 15, subfunction 1 - set a size of the background image. ==
  505. ======================================================================
  506. Parameters:
  507.   * eax = 15 - function number
  508.   * ebx = 1 - subfunction number
  509.   * ecx = width of the image
  510.   * edx = height of the image
  511. Returned value:
  512.   * function does not return value
  513. Remarks:
  514.   * Before calling subfunctions 2 and 5 you should call this function
  515.     to set image size!
  516.   * For update of the screen (after completion of a series of commands
  517.     working with a background) call subfunction 3.
  518.   * There is a pair function for get size of the background image -
  519.     subfunction 1 of function 39.
  520.  
  521. ======================================================================
  522. === Function 15, subfunction 2 - put pixel on the background image. ==
  523. ======================================================================
  524. Parameters:
  525.   * eax = 15 - function number
  526.   * ebx = 2 - subfunction number
  527.   * ecx = offset
  528.   * edx = color of a pixel 0xRRGGBB
  529. Returned value:
  530.   * function does not return value
  531. Remarks:
  532.   * Offset for a pixel with coordinates (x,y) is calculated as
  533.     (x+y*xsize)*3.
  534.   * If the given offset exceeds size set by subfunction 1,
  535.     the call is ignored.
  536.   * For update of the screen (after completion of a series of commands
  537.     working with a background) call subfunction 3.
  538.   * There is a pair function for get pixel on the background image -
  539.     subfunction 2 of function 39.
  540.  
  541. ======================================================================
  542. =========== Function 15, subfunction 3 - redraw background. ==========
  543. ======================================================================
  544. Parameters:
  545.   * eax = 15 - function number
  546.   * ebx = 3 - subfunction number
  547. Returned value:
  548.   * function does not return value
  549.  
  550. ======================================================================
  551. == Function 15, subfunction 4 - set drawing mode for the background. =
  552. ======================================================================
  553. Parameters:
  554.   * eax = 15 - function number
  555.   * ebx = 4 - subfunction number
  556.   * ecx = drawing mode:
  557.     * 1 = tile
  558.     * 2 = stretch
  559. Returned value:
  560.   * function does not return value
  561. Remarks:
  562.   * For update of the screen (after completion of a series of commands
  563.     working with a background) call subfunction 3.
  564.   * There is a pair function for get drawing mode of the background -
  565.     subfunction 4 of function 39.
  566.  
  567. ======================================================================
  568. ===================== Function 15, subfunction 5 =====================
  569. ============ Put block of pixels on the background image. ============
  570. ======================================================================
  571. Parameters:
  572.   * eax = 15 - function number
  573.   * ebx = 5 - subfunction number
  574.   * ecx = pointer to the data in the format BBGGRRBBGGRR...
  575.   * edx = offset in data of the background image
  576.   * esi = size of data in bytes = 3 * number of pixels
  577. Returned value:
  578.   * function does not return value
  579. Remarks:
  580.   * Offset and size are not checked for correctness.
  581.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  582.   * Pixels of the background image are written sequentially
  583.     from left to right, from up to down.
  584.   * Offset of pixel with coordinates (x,y) is (x+y*xsize)*3.
  585.   * For update of the screen (after completion of a series of commands
  586.     working with a background) call subfunction 3.
  587.  
  588. ======================================================================
  589. ===================== Function 15, subfunction 6 =====================
  590. ======== Map background data to the address space of process. ========
  591. ======================================================================
  592. Parameters:
  593.   * eax = 15 - function number
  594.   * ebx = 6 - subfunction number
  595. Returned value:
  596.   * eax = pointer to background data, 0 if error
  597. Remarks:
  598.   * Mapped data are available for read and write.
  599.   * Size of background data is 3*xsize*ysize. The system blocks
  600.     changes of background sizes while process works with mapped data.
  601.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  602.   * Pixels of the background image are written sequentially
  603.     from left to right, from up to down.
  604.  
  605. ======================================================================
  606. ===== Function 15, subfunction 7 - close mapped background data. =====
  607. ======================================================================
  608. Parameters:
  609.   * eax = 15 - function number
  610.   * ebx = 7 - subfunction number
  611.   * ecx = pointer to mapped data
  612. Returned value:
  613.   * eax = 1 - success, 0 - error
  614.  
  615. ======================================================================
  616. ===================== Function 15, subfunction 8 =====================
  617. ============= Get coordinates of last draw the background ============
  618. ======================================================================
  619. Parameters:
  620.   * eax = 15 - function number
  621.   * ebx = 8 - subfunction number
  622. Returned value:
  623.   * eax = [left]*65536 + [right]
  624.   * ebx = [top]*65536 + [bottom]
  625. Remarks:
  626.   * (left,top) are coordinates of the left upper corner,
  627.     (right,bottom) are coordinates of the right lower one.
  628.   * For receiving more reliable information, call the function
  629.     immediately after the event:
  630.              5 = kernel finished redrawing of the desktop background
  631.  
  632. ======================================================================
  633. ===================== Function 15, subfunction 9 =====================
  634. ============= Redraws a rectangular part of the background ===========
  635. ======================================================================
  636. Parameters:
  637.   * eax = 15 - function number
  638.   * ebx = 9 - subfunction number
  639.   * ecx = [left]*65536 + [right]
  640.   * edx = [top]*65536 + [bottom]
  641. Returned value:
  642.   * function does not return value
  643. Remarks:
  644.   * (left,top) are coordinates of the left upper corner,
  645.     (right,bottom) are coordinates of the right lower one.
  646.   * If parameters are set incorrectly then background is not redrawn.
  647.  
  648. ======================================================================
  649. =============== Function 16 - save ramdisk on a floppy. ==============
  650. ======================================================================
  651. Parameters:
  652.   * eax = 16 - function number
  653.   * ebx = 1 or ebx = 2 - on which floppy save
  654. Returned value:
  655.   * eax = 0 - success
  656.   * eax = 1 - error
  657.  
  658. ======================================================================
  659. ======= Function 17 - get the identifier of the pressed button. ======
  660. ======================================================================
  661. Takes away the code of the pressed button from the buffer.
  662. Parameters:
  663.   * eax = 17 - function number
  664. Returned value:
  665.   * if the buffer is empty, function returns eax=1
  666.   * if the buffer is not empty:
  667.     * high 24 bits of eax contain button identifier (in particular,
  668.       ah contains low byte of the identifier; if all buttons have
  669.       the identifier less than 256, ah is enough to distinguish)
  670.     * al = 0 - the button was pressed with left mouse button
  671.     * al = bit corresponding to used mouse button otherwise
  672. Remarks:
  673.   * "Buffer" keeps only one button, at pressing the new button the
  674.     information about old is lost.
  675.   * The call of this function by an application with inactive window
  676.     will return answer "buffer is empty".
  677.   * Returned value for al corresponds to the state of mouse buttons
  678.     as in subfunction 2 of function 37 at the beginning
  679.     of button press, excluding lower bit, which is cleared.
  680.  
  681. ======================================================================
  682. ===================== Function 18, subfunction 1 =====================
  683. ============= Make deactive the window of the given thread. ==========
  684. ======================================================================
  685. Parameters:
  686.   * eax = 18 - function number
  687.   * ebx = 1 - subfunction number
  688.   * ecx = number of the thread slot
  689. Returned value:
  690.   * function does not return value
  691.  
  692. ======================================================================
  693. = Function 18, subfunction 2 - terminate process/thread by the slot. =
  694. ======================================================================
  695. Parameters:
  696.   * eax = 18 - function number
  697.   * ebx = 2 - subfunction number
  698.   * ecx = number of the slot of process/thread
  699. Returned value:
  700.   * function does not return value
  701. Remarks:
  702.   * It is impossible to terminate system thread OS/IDLE (with
  703.     number of the slot 1),
  704.     it is possible to terminate any normal process/thread.
  705.   * See also subfunction 18 - terminate
  706.     process/thread by the identifier.
  707.  
  708. ======================================================================
  709. ===================== Function 18, subfunction 3 =====================
  710. ============= Make active the window of the given thread. ============
  711. ======================================================================
  712. Parameters:
  713.   * eax = 18 - function number
  714.   * ebx = 3 - subfunction number
  715.   * ecx = number of the thread slot
  716. Returned value:
  717.   * function does not return value
  718. Remarks:
  719.   * If correct, but nonexistent slot is given,
  720.     some window is made active.
  721.   * To find out, which window is active, use subfunction 7.
  722.  
  723. ======================================================================
  724. ===================== Function 18, subfunction 4 =====================
  725. =========== Get counter of idle time units per one second. ===========
  726. ======================================================================
  727. Idle time units are units, in which the processor stands idle
  728. in waiting for interrupt (in the command 'hlt').
  729.  
  730. Parameters:
  731.   * eax = 18 - function number
  732.   * ebx = 4 - subfunction number
  733. Returned value:
  734.   * eax = value of the counter of idle time units per one second
  735.  
  736. ======================================================================
  737. ========== Function 18, subfunction 5 - get CPU clock rate. ==========
  738. ======================================================================
  739. Parameters:
  740.   * eax = 18 - function number
  741.   * ebx = 5 - subfunction number
  742. Returned value:
  743.   * eax = clock rate (modulo 2^32 clock ticks = 4GHz)
  744.  
  745. ======================================================================
  746.  Function 18, subfunction 6 - save ramdisk to the file on hard drive.
  747. ======================================================================
  748. Parameters:
  749.   * eax = 18 - function number
  750.   * ebx = 6 - subfunction number
  751.   * ecx = pointer to the full path to file
  752.     (for example, "/hd0/1/kolibri/kolibri.img")
  753. Returned value:
  754.   * eax = 0 - success
  755.   * else eax = error code of the file system
  756. Remarks:
  757.   * All folders in the given path must exist, otherwise function
  758.     returns value 5, "file not found".
  759.  
  760. ======================================================================
  761. =========== Function 18, subfunction 7 - get active window. ==========
  762. ======================================================================
  763. Parameters:
  764.   * eax = 18 - function number
  765.   * ebx = 7 - subfunction number
  766. Returned value:
  767.   * eax = number of the active window
  768.     (number of the slot of the thread with active window)
  769. Remarks:
  770.   * Active window is at the top of the window stack and receives
  771.     messages on all keyboard input.
  772.   * To make a window active, use subfunction 3.
  773.  
  774. ======================================================================
  775. == Function 18, subfunction 8 - disable/enable the internal speaker. =
  776. ======================================================================
  777. If speaker sound is disabled, all calls to subfunction 55 of
  778. function 55 are ignored. If speaker sound is enabled,
  779. they are routed on builtin speaker.
  780.  
  781. ------------------- Subsubfunction 1 - get status. -------------------
  782. Parameters:
  783.   * eax = 18 - function number
  784.   * ebx = 8 - subfunction number
  785.   * ecx = 1 - number of the subsubfunction
  786. Returned value:
  787.   * eax = 0 - speaker sound is enabled; 1 - disabled
  788.  
  789. ----------------- Subsubfunction 2 - toggle status. ------------------
  790. Toggles states of disable/enable.
  791. Parameters:
  792.   * eax = 18 - function number
  793.   * ebx = 8 - subfunction number
  794.   * ecx = 2 - number of the subsubfunction
  795. Returned value:
  796.   * function does not return value
  797.  
  798. ======================================================================
  799. == Function 18, subfunction 9 - system shutdown with the parameter. ==
  800. ======================================================================
  801. Parameters:
  802.   * eax = 18 - function number
  803.   * ebx = 9 - subfunction number
  804.   * ecx = parameter:
  805.     * 2 = turn off computer
  806.     * 3 = reboot computer
  807.     * 4 = restart the kernel from the file 'kernel.mnt' on ramdisk
  808. Returned value:
  809.   * at incorrect ecx the registers do not change (i.e. eax=18)
  810.   * by correct call function always returns eax=0
  811.     as the tag of success
  812. Remarks:
  813.   * Do not rely on returned value by incorrect call, it can be
  814.     changed in future versions of the kernel.
  815.  
  816. ======================================================================
  817. ===== Function 18, subfunction 10 - minimize application window. =====
  818. ======================================================================
  819. Minimizes the own window.
  820. Parameters:
  821.   * eax = 18 - function number
  822.   * ebx = 10 - subfunction number
  823. Returned value:
  824.   * function does not return value
  825. Remarks:
  826.   * The minimized window from the point of view of function 9
  827.     keeps position and sizes.
  828.   * Restoring of an application window occurs at its activation by
  829.     subfunction 3.
  830.   * Usually there is no necessity to minimize/restire a window
  831.     obviously: minimization of a window is carried out by the system
  832.     at pressing the minimization button (for skinned windows
  833.     it is defined automatically by function 0,
  834.     for other windows it can be defined manually by function 8),
  835.     restore of a window is done by the application '@panel'.
  836.  
  837. ======================================================================
  838.  Function 18, subfunction 11 - get information on the disk subsystem.
  839. ======================================================================
  840. Parameters:
  841.   * eax = 18 - function number
  842.   * ebx = 11 - subfunction number
  843.   * ecx = type of the table:
  844.     * 1 = short version, 10 bytes
  845.     * 2 = full version, 65536 bytes
  846.   * edx = pointer to the buffer (in the application) for the table
  847. Returned value:
  848.   * function does not return value
  849. Format of the table: short version:
  850.   * +0: byte: information about FDD's (drives for floppies),
  851.     AAAABBBB, where AAAA gives type of the first drive, BBBB -
  852.     of the second regarding to the following list:
  853.     * 0 = there is no drive
  854.     * 1 = 360Kb, 5.25''
  855.     * 2 = 1.2Mb, 5.25''
  856.     * 3 = 720Kb, 3.5''
  857.     * 4 = 1.44Mb, 3.5''
  858.     * 5 = 2.88Mb, 3.5'' (such drives are not used anymore)
  859.     For example, for the standard configuration from one 1.44-drive
  860.     here will be 40h, and for the case 1.2Mb on A: and 1.44Mb on B:
  861.     the value is 24h.
  862.   * +1: byte: information about hard disks and CD-drives, AABBCCDD,
  863.     where AA corresponds to the controller IDE0, ..., DD - IDE3:
  864.     * 0 = device is absent
  865.     * 1 = hard drive
  866.     * 2 = CD-drive
  867.     For example, in the case HD on IDE0 and CD on IDE2
  868.     this field contains 48h.
  869.   * +2: 4 db: number of the retrieved partitions on hard disks
  870.     at accordingly IDE0,...,IDE3.
  871.     If the hard disk on IDEx is absent, appropriate byte is zero,
  872.     otherwise it shows number of the recognized partitions, which
  873.     can be not presented (if the drive is not formatted or if
  874.     the file system is not supported). Current version of the kernel
  875.     supports only FAT16, FAT32 and NTFS for hard disks.
  876.   * +6: 4 db: reserved
  877. Format of the table: full version:
  878.   * +0: 10 db: same as for the short version
  879.   * +10: 100 db: data for the first partition
  880.   * +110: 100 db: data for the second partition
  881.   * ...
  882.   * +10+100*(n-1): 100 db: data for the last partition
  883. The partitions are located as follows: at first sequentially all
  884. recoginzed partitions on HD on IDE0 (if present),
  885. then on HD on IDE1 (if present) and so on up to IDE3.
  886. Format of the information about partition
  887. (at moment only FAT is supported):
  888.   * +0: dword: first physical sector of the partition
  889.   * +4: dword: last physical sector of the partition
  890.     (belongs to the partition)
  891.   * +8: byte: file system type:
  892.     16=FAT16, 32=FAT32, 1=NTFS
  893.   * other data are dependent on file system, are modified with
  894.     kernel modifications and therefore are not described
  895. Remarks:
  896.   * The short table can be used for obtaining the information about
  897.     available devices.
  898.  
  899. ======================================================================
  900. ========== Function 18, subfunction 13 - get kernel version. =========
  901. ======================================================================
  902. Parameters:
  903.   * eax = 18 - function number
  904.   * ebx = 13 - subfunction number
  905.   * ecx = pointer to the buffer (not less than 16 bytes), where
  906.     the information will be placed
  907. Returned value:
  908.   * function does not return value
  909. Structure of the buffer:
  910. db a,b,c,d for version a.b.c.d
  911. db 0: reserved
  912. dd REV - kernel SVN revision number
  913. For Kolibri 0.7.7.0+ kernel:
  914. db 0,7,7,0
  915. db 0
  916. dd 1675
  917.  
  918. ======================================================================
  919. ======= Function 18, subfunction 14 - wait for screen retrace. =======
  920. ======================================================================
  921. Waits for the beginning of retrace of the scanning ray of the screen
  922. monitor.
  923. Parameters:
  924.   * eax = 18 - function number
  925.   * ebx = 14 - subfunction number
  926. Returned value:
  927.   * eax = 0 as the tag of success
  928. Remarks:
  929.   * Function is intended only for active high-efficiency graphics
  930.     applications; is used for smooth output of a graphics.
  931.  
  932. ======================================================================
  933. == Function 18, subfunction 15 - center mouse cursor on the screen. ==
  934. ======================================================================
  935. Parameters:
  936.   * eax = 18 - function number
  937.   * ebx = 15 - subfunction number
  938. Returned value:
  939.   * eax = 0 as the tag of success
  940.  
  941. ======================================================================
  942. ========= Function 18, subfunction 16 - get size of free RAM. ========
  943. ======================================================================
  944. Parameters:
  945.   * eax = 18 - function number
  946.   * ebx = 16 - subfunction number
  947. Returned value:
  948.   * eax = size of free memory in kilobytes
  949.  
  950. ======================================================================
  951. ======== Function 18, subfunction 17 - get full amount of RAM. =======
  952. ======================================================================
  953. Parameters:
  954.   * eax = 18 - function number
  955.   * ebx = 17 - subfunction number
  956. Returned value:
  957.   * eax = total size of existing memory in kilobytes
  958.  
  959. ======================================================================
  960. ===================== Function 18, subfunction 18 ====================
  961. ============= Terminate process/thread by the identifier. ============
  962. ======================================================================
  963. Parameters:
  964.   * eax = 18 - function number
  965.   * ebx = 18 - subfunction number
  966.   * ecx = identifer of process/thread (PID/TID)
  967. Returned value:
  968.   * eax = 0 - success
  969.   * eax = -1 - error (process is not found or is system)
  970. Remarks:
  971.   * It is impossible to terminate system thread OS/IDLE (identifier
  972.     1), it is possible to terminate any normal process/thread.
  973.   * See also subfunction 2 - terminate
  974.     process/thread by given slot.
  975.  
  976. ======================================================================
  977. ======== Function 18, subfunction 19 - get/set mouse features. =======
  978. ======================================================================
  979.  
  980. ---------------- Subsubfunction 0 - get mouse speed. -----------------
  981. Parameters:
  982.   * eax = 18 - function number
  983.   * ebx = 19 - subfunction number
  984.   * ecx = 0 - subsubfunction number
  985. Returned value:
  986.   * eax = current mouse speed
  987.  
  988. ---------------- Subsubfunction 1 - set mouse speed. -----------------
  989. Parameters:
  990.   * eax = 18 - function number
  991.   * ebx = 19 - subfunction number
  992.   * ecx = 1 - subsubfunction number
  993.   * edx = new value for speed
  994. Returned value:
  995.   * function does not return value
  996.  
  997. ---------------- Subsubfunction 2 - get mouse delay. -----------------
  998. Parameters:
  999.   * eax = 18 - function number
  1000.   * ebx = 19 - subfunction number
  1001.   * ecx = 2 - subsubfunction number
  1002. Returned value:
  1003.   * eax = current mouse delay
  1004.  
  1005. ---------------- Subsubfunction 3 - set mouse delay. -----------------
  1006. Parameters:
  1007.   * eax = 18 - function number
  1008.   * ebx = 19 - subfunction number
  1009.   * ecx = 3 - subsubfunction number
  1010.   * edx = new value for mouse delay
  1011. Returned value:
  1012.   * function does not return value
  1013.  
  1014. ----------- Subsubfunction 4 - set mouse pointer position. -----------
  1015. Parameters:
  1016.   * eax = 18 - function number
  1017.   * ebx = 19 - subfunction number
  1018.   * ecx = 4 - subsubfunction number
  1019.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1020. Returned value:
  1021.   * function does not return value
  1022.  
  1023. -------- Subsubfunction 5 - simulate state of mouse buttons. ---------
  1024. Parameters:
  1025.   * eax = 18 - function number
  1026.   * ebx = 19 - subfunction number
  1027.   * ecx = 5 - subsubfunction number
  1028.   * edx = information about emulated state of mouse buttons:
  1029.     (same as return value in subfunction 2 of function 37)
  1030.     * bit 0 is set = left button is pressed
  1031.     * bit 1 is set = right button is pressed
  1032.     * bit 2 is set = middle button is pressed
  1033.     * bit 3 is set = 4th button is pressed
  1034.     * bit 4 is set = 5th button is pressed
  1035. Returned value:
  1036.   * function does not return value
  1037. Remarks:
  1038.   * It is recommended to set speed of the mouse (in subsubfunction 1)
  1039.     from 1 up to 9. The installed value is not inspected by the kernel
  1040.     code, so set it carefully, at incorrect value the cursor
  1041.     can "freeze". Speed of the mouse can be regulated through the
  1042.     application SETUP.
  1043.   * Recommended delay of the mouse (in subsubfunction 3) = 10. Lower
  1044.     value is not handled by COM mice. At the very large values the
  1045.     movement of the mouse on 1 pixel is impossible and the cursor will
  1046.     jump on the value of installed speed (subsubfunction 1). The
  1047.     installed value is not inspected by the kernel code.
  1048.     Mouse delay can be regulated through the application SETUP.
  1049.   * The subsubfunction 4 does not check the passed value. Before
  1050.     its call find out current screen resolution (with function 14)
  1051.     and check that the value of position is inside the limits of the
  1052.     screen.
  1053.  
  1054. ======================================================================
  1055. ======== Function 18, subfunction 20 - get information on RAM. =======
  1056. ======================================================================
  1057. Parameters:
  1058.   * eax = 18 - function number
  1059.   * ebx = 20 - subfunction number
  1060.   * ecx = pointer to the buffer for information (36 bytes)
  1061. Returned value:
  1062.   * eax = total size of existing RAM in pages
  1063.     or -1 if error has occured
  1064.   * buffer pointed to by ecx contains the following information:
  1065.     * +0:  dword: total size of existing RAM in pages
  1066.     * +4:  dword: size of free RAM in pages
  1067.     * +8:  dword: number of page faults (exceptions #PF)
  1068.                  in applications
  1069.     * +12: dword: size of kernel heap in bytes
  1070.     * +16: dword: free in kernel heap in bytes
  1071.     * +20: dword: total number of memory blocks in kernel heap
  1072.     * +24: dword: number of free memory blocks in kernel heap
  1073.     * +28: dword: size of maximum free block in kernel heap
  1074.                  (reserved)
  1075.     * +32: dword: size of maximum allocated block in kernel heap
  1076.                  (reserved)
  1077.  
  1078. ======================================================================
  1079. ===================== Function 18, subfunction 21 ====================
  1080. ======== Get slot number of process/thread by the identifier. ========
  1081. ======================================================================
  1082. Parameters:
  1083.   * eax = 18 - function number
  1084.   * ebx = 21 - subfunction number
  1085.   * ecx = identifer of process/thread (PID/TID)
  1086. Returned value:
  1087.   * eax = 0 - error (invalid identifier)
  1088.   * otherwise eax = slot number
  1089.  
  1090. ======================================================================
  1091. ===================== Function 18, subfunction 22 ====================
  1092. ============== Operations with window of another thread. =============
  1093. ======================================================================
  1094. Parameters:
  1095.   * eax = 18 - function number
  1096.   * ebx = 22 - subfunction number
  1097.   * ecx = operation type:
  1098.     * 0 = minimize window of the thread with given slot number
  1099.     * 1 = minimize window of the thread with given identifier
  1100.     * 2 = restore window of the thread with given slot number
  1101.     * 3 = restore window of the thread with given identifier
  1102.   * edx = parameter (slot number or PID/TID)
  1103. Returned value:
  1104.   * eax = 0 - success
  1105.   * eax = -1 - error (invalid identifier)
  1106. Remarks:
  1107.   * The thread can minimize its window with subfunction 10.
  1108.   * One can restore and activate window simultaneously with
  1109.     subfunction 3 (which requires slot number).
  1110.  
  1111. ======================================================================
  1112. ======== Function 18, subfunction 23 - minimize all windows. ==========
  1113. ======================================================================
  1114. Parameters:
  1115.   * eax = 18 - function number
  1116.   * ebx = 23 - subfunction number
  1117. Returned value:
  1118.   * eax = 0 - all windows have been minimized before a function call
  1119.   * eax = N - number of windows minimized from function
  1120. Remarks:
  1121.   * Window of special thread (name begin to symbol @) is not minimize.
  1122.  
  1123. ======================================================================
  1124. ======= Function 18, subfunction 24 - set limits of screen. ==========
  1125. ======================================================================
  1126. Parameters:
  1127.   * eax = 18 - function number
  1128.   * ebx = 24 - subfunction number
  1129.   * ecx = new X size
  1130.   * edx = new Y size
  1131. Returned value:
  1132.   * function does not return value
  1133. Remarks:
  1134.   * The function does not change the physical size of the video mode.
  1135.     It is designed for non-standard displays which display the image
  1136.     partially.
  1137.   * The sizes specified in the function should not exceed the sizes
  1138.     of the current video mode, otherwise the function will not change
  1139.     anything.
  1140.  
  1141. ======================================================================
  1142. ==================== Function 20 - MIDI interface. ===================
  1143. ======================================================================
  1144.  
  1145. ----------------------- Subfunction 1 - reset ------------------------
  1146. Parameters:
  1147.   * eax = 20 - function number
  1148.   * ebx = 1 - subfunction number
  1149.  
  1150. -------------------- Subfunction 2 - output byte ---------------------
  1151. Parameters:
  1152.   * eax = 20 - function number
  1153.   * ebx = 2 - subfunction number
  1154.   * cl = byte for output
  1155. Returned value (is the same for both subfunctions):
  1156.   * eax = 0 - success
  1157.   * eax = 1 - base port is not defined
  1158. Remarks:
  1159.   * Previously the base port must be defined by
  1160.     subfunction 1 of function 21.
  1161.  
  1162. ======================================================================
  1163. ======== Function 21, subfunction 1 - set MPU MIDI base port. ========
  1164. ======================================================================
  1165. Parameters:
  1166.   * eax = 21 - function number
  1167.   * ebx = 1 - subfunction number
  1168.   * ecx = number of base port
  1169. Returned value
  1170.   * eax = 0 - success
  1171.   * eax = -1 - erratic number of a port
  1172. Remarks:
  1173.   * Number of a port must satisfy to conditions 0x100<=ecx<=0xFFFF.
  1174.   * The installation of base is necessary for function 20.
  1175.   * To get base port use subfunction 1 of function 26.
  1176.  
  1177. ======================================================================
  1178. ========== Function 21, subfunction 2 - set keyboard layout. =========
  1179. ======================================================================
  1180. Keyboard layout is used to convert keyboard scancodes to ASCII-codes,
  1181. which will be read by function 2.
  1182. Parameters:
  1183.   * eax = 21 - function number
  1184.   * ebx = 2 - subfunction number
  1185.   * ecx = which layout to set:
  1186.     * 1 = normal layout
  1187.     * 2 = layout at pressed Shift
  1188.     * 3 = layout at pressed Alt
  1189.   * edx = pointer to layout - table of length 128 bytes
  1190. Or:
  1191.   * ecx = 9
  1192.   * dx = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1193. Returned value:
  1194.   * eax = 0 - success
  1195.   * eax = 1 - incorrect parameter
  1196. Remarks:
  1197.   * If Alt is pressed, the layout with Alt is used;
  1198.     if Alt is not pressed, but Shift is pressed,
  1199.     the layout with Shift is used;
  1200.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1201.     layout is used and then from the code is subtracted 0x60;
  1202.     if no control key is pressed, the normal layout is used.
  1203.   * To get layout and country identifier use
  1204.     subfunction 2 of function 26.
  1205.   * Country identifier is global system variable, which is not used
  1206.     by the kernel itself; however the application '@panel' displays
  1207.     the corresponding icon.
  1208.   * The application @panel switches layouts on user request.
  1209.  
  1210. ======================================================================
  1211. ============== Function 21, subfunction 3 - set CD base. =============
  1212. ======================================================================
  1213. Parameters:
  1214.   * eax = 21 - function number
  1215.   * ebx = 3 - subfunction number
  1216.   * ecx = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1217. Returned value:
  1218.   * eax = 0
  1219. Remarks:
  1220.   * CD base is used by function 24.
  1221.   * To get CD base use subfunction 3 of function 26.
  1222.  
  1223. ======================================================================
  1224. ========== Function 21, subfunction 5 - set system language. =========
  1225. ======================================================================
  1226. Parameters:
  1227.   * eax = 21 - function number
  1228.   * ebx = 5 - subfunction number
  1229.   * ecx = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1230. Returned value:
  1231.   * eax = 0
  1232. Remarks:
  1233.   * System language is global system variable and is not used
  1234.     by the kernel itself, however application @panel draws the
  1235.     appropriate icon.
  1236.   * Function does not check for correctness, as the kernel does not
  1237.     use this variable.
  1238.   * To get system language use subfunction 5 of function 26.
  1239.  
  1240. ======================================================================
  1241. ============== Function 21, subfunction 7 - set HD base. =============
  1242. ======================================================================
  1243. The HD base defines hard disk to write with usage of obsolete
  1244. syntax /HD in obsolete function 58; at usage of modern syntax
  1245. /HD0,/HD1,/HD2,/HD3 base is set automatically.
  1246. Parameters:
  1247.   * eax = 21 - function number
  1248.   * ebx = 7 - subfunction number
  1249.   * ecx = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1250. Returned value:
  1251.   * eax = 0
  1252. Remarks:
  1253.   * Any application at any time can change the base.
  1254.   * Do not change base, when any application works with hard disk.
  1255.     If you do not want system bugs.
  1256.   * To get HD base use subfunction 7 of function 26.
  1257.   * It is also necessary to define used partition of hard disk by
  1258.     subfunction 8.
  1259.  
  1260. ======================================================================
  1261. ========= Function 21, subfunction 8 - set used HD partition. ========
  1262. ======================================================================
  1263. The HD partition defines partition of the hard disk to write with
  1264. usage of obsolete syntax /HD and obsolete function 58;
  1265. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1266. base and partition are set automatically.
  1267. Parameters:
  1268.   * eax = 21 - function number
  1269.   * ebx = 8 - subfunction number
  1270.   * ecx = HD partition (beginning from 1)
  1271. Return value:
  1272.   * eax = 0
  1273. Remarks:
  1274.   * Any application at any time can change partition.
  1275.   * Do not change partition when any application works with hard disk.
  1276.     If you do not want system bugs.
  1277.   * To get used partition use subfunction 8 of function 26.
  1278.   * There is no correctness checks.
  1279.   * To get the number of partitions of a hard disk use
  1280.     subfunction 11 of function 18.
  1281.   * It is also necessary to define used HD base by subfunction 7.
  1282.  
  1283. ======================================================================
  1284.  Function 21, subfunction 11 - enable/disable low-level access to HD.
  1285. ======================================================================
  1286. Parameters:
  1287.   * eax = 21 - function number
  1288.   * ebx = 11 - subfunction number
  1289.   * ecx = 0/1 - disable/enable
  1290. Returned value:
  1291.   * eax = 0
  1292. Remarks:
  1293.   * Is used in LBA-read (subfunction 8 of function 58).
  1294.   * The current implementation uses only low bit of ecx.
  1295.   * To get current status use subfunction 11 of function 26.
  1296.  
  1297. ======================================================================
  1298.  Function 21, subfunction 12 - enable/disable low-level access to PCI.
  1299. ======================================================================
  1300. Parameters:
  1301.   * eax = 21 - function number
  1302.   * ebx = 12 - subfunction number
  1303.   * ecx = 0/1 - disable/enable
  1304. Returned value:
  1305.   * eax = 0
  1306. Remarks:
  1307.   * Is used in operations with PCI bus (function 62).
  1308.   * The current implementation uses only low bit of ecx.
  1309.   * To get current status use subfunction 12 of function 26.
  1310.  
  1311. ======================================================================
  1312. ============ Function 21, subfunction 13, subsubfunction 1 ===========
  1313. ======== Initialize + get information on the driver vmode.mdr. =======
  1314. ======================================================================
  1315. Parameters:
  1316.   * eax = 21 - function number
  1317.   * ebx = 13 - subfunction number
  1318.   * ecx = 1 - number of the driver function
  1319.   * edx = pointer to 512-bytes buffer
  1320. Returned value:
  1321.   * if driver is not loaded
  1322.     (never happens in the current implementation):
  1323.     * eax = -1
  1324.     * ebx, ecx destroyed
  1325.   * if driver is loaded:
  1326.     * eax = 'MDAZ' (in fasm style, that is 'M' - low byte, 'Z' - high)
  1327.       - signature
  1328.     * ebx = current frequency of the scanning (in Hz)
  1329.     * ecx destroyed
  1330.     * buffer pointed to by edx is filled
  1331. Format of the buffer:
  1332.   * +0: 32*byte: driver name, "Trans VideoDriver"
  1333.     (without quotes, supplemented by spaces)
  1334.   * +32 = +0x20: dword: driver version (version x.y is encoded as
  1335.     y*65536+x), for the current implementation is 1 (1.0)
  1336.   * +36 = +0x24: 7*dword: reserved (0 in the current implementation)
  1337.   * +64 = +0x40: 32*word: list of supported videomodes (each word
  1338.     is number of a videomode, after list itself there are zeroes)
  1339.   * +128 = +0x80: 32*(5*word): list of supported frequences of the
  1340.     scannings for videomodes: for each videomode listed in the
  1341.     previous field up to 5 supported frequences are given
  1342.     (unused positions contain zeroes)
  1343. Remarks:
  1344.   * Function initializes the driver (if it is not initialized yet)
  1345.     and must be called first, before others (otherwise they will do
  1346.     nothing and return -1).
  1347.   * The current implementation supports only one frequency
  1348.     of the scanning on videomode.
  1349.  
  1350. ======================================================================
  1351. ============ Function 21, subfunction 13, subsubfunction 2 ===========
  1352. ================ Get information on current videomode. ===============
  1353. ======================================================================
  1354. Parameters:
  1355.   * eax = 21 - function number
  1356.   * ebx = 13 - subfunction number
  1357.   * ecx = 2 - number of the driver function
  1358. Returned value:
  1359.   * eax = -1 - driver is not loaded or not initialized;
  1360.     ebx,ecx are destroyed
  1361.   * eax = [width]*65536 + [height]
  1362.   * ebx = frequency of the vertical scanning (in Hz)
  1363.   * ecx = number of current videomode
  1364. Remarks:
  1365.   * Driver must be initialized by call to
  1366.     driver function 1.
  1367.   * If only screen sizes are required, it is more expedient to use
  1368.     function 14 taking into account that it
  1369.     returns sizes on 1 less.
  1370.  
  1371. ======================================================================
  1372. === Function 21, subfunction 13, subsubfunction 3 - set videomode. ===
  1373. ======================================================================
  1374. Parameters:
  1375.   * eax = 21 - function number
  1376.   * ebx = 13 - subfunction number
  1377.   * ecx = 3 - number of the driver function
  1378.   * edx = [scanning frequency]*65536 + [videomode number]
  1379. Returned value:
  1380.   * eax = -1 - driver is not loaded, not initialized or
  1381.     an error has occured
  1382.   * eax = 0 - success
  1383.   * ebx, ecx destroyed
  1384. Remarks:
  1385.   * Driver must be initialized by driver function 1.
  1386.   * The videomode number and frequency must be in the table
  1387.     returned by driver function 1.
  1388.  
  1389. ======================================================================
  1390. ============ Function 21, subfunction 13, subsubfunction 4 ===========
  1391. ================== Return to the initial videomode. ==================
  1392. ======================================================================
  1393. Returns the screen to the videomode set at system boot.
  1394. Parameters:
  1395.   * eax = 21 - function number
  1396.   * ebx = 13 - subfunction number
  1397.   * ecx = 4 - number of the driver function
  1398. Returned value:
  1399.   * eax = -1 - driver is not loaded or not initialized
  1400.   * eax = 0 - success
  1401.   * ebx, ecx destroyed
  1402. Remarks:
  1403.   * Driver must be initialized by call to driver function 1.
  1404.  
  1405. ======================================================================
  1406. ============ Function 21, subfunction 13, subsubfunction 5 ===========
  1407. ===== Increase/decrease the size of the visible area of monitor. =====
  1408. ======================================================================
  1409. Parameters:
  1410.   * eax = 21 - function number
  1411.   * ebx = 13 - subfunction number
  1412.   * ecx = 5 - number of the driver function
  1413.   * edx = 0/1 - decrease/increase horizontal size on 1 position
  1414.   * edx = 2/3 - is not supported in the current implementation;
  1415.     is planned as decrease/increase vertical size on 1 position
  1416. Returned value:
  1417.   * eax = -1 - driver is not loaded or not initialized
  1418.   * eax = 0 - success
  1419.   * ebx, ecx destroyed
  1420. Remarks:
  1421.   * Driver must be initialized by call to driver function 1.
  1422.   * Function influences only the physical size of the screen image;
  1423.     the logical size (number of pixels) does not change.
  1424.  
  1425. ======================================================================
  1426. ================= Function 22 - set system date/time. ================
  1427. ======================================================================
  1428. Parameters:
  1429.   * eax = 22 - function number
  1430.   * ebx = 0 - set time
  1431.     * ecx = 0x00SSMMHH - time in the binary-decimal code (BCD):
  1432.     * HH=hour 00..23
  1433.     * MM=minute 00..59
  1434.     * SS=second 00..59
  1435.   * ebx = 1 - set date
  1436.     * ecx = 0x00DDMMYY - date in the binary-decimal code (BCD):
  1437.     * DD=day 01..31
  1438.     * MM=month 01..12
  1439.     * YY=year 00..99
  1440.   * ebx = 2 - set day of week
  1441.     * ecx = 1 for Sunday, ..., 7 for Saturday
  1442.   * ebx = 3 - set alarm clock
  1443.     * ecx = 0x00SSMMHH
  1444. Returned value:
  1445.   * eax = 0 - success
  1446.   * eax = 1 - incorrect parameter
  1447.   * eax = 2 - CMOS-battery was unloaded
  1448. Remarks:
  1449.   * Value of installation of day of week seems to be doubtful,
  1450.     as it a little where is used
  1451.     (day of week can be calculated by date).
  1452.   * Alarm clock can be set on operation in the given time every day.
  1453.     But there is no existing system function to disable it.
  1454.   * Operation of alarm clock consists in generation IRQ8.
  1455.   * Generally CMOS supports for alarm clock set of value 0xFF
  1456.     as one of parameters and it means that the appropriate parameter
  1457.     is ignored. But current implementation does not allow this
  1458.     (will return 1).
  1459.   * Alarm clock is a global system resource; the set of
  1460.     an alarm clock cancels automatically the previous set.
  1461.     However, at moment no program uses it.
  1462.  
  1463. ======================================================================
  1464. ============= Function 23 - wait for event with timeout. =============
  1465. ======================================================================
  1466. If the message queue is empty, waits for new message in the queue,
  1467. but no more than given time. Then reads out a message from the queue.
  1468.  
  1469. Parameters:
  1470.   * eax = 23 - function number
  1471.   * ebx = timeout (in 1/100 of second)
  1472. Returned value:
  1473.   * eax = 0 - the message queue is empty
  1474.   * otherwise eax = event (see the list of events)
  1475. Remarks:
  1476.   * Only those events are taken into account, which enter into
  1477.     the mask set by function 40. By default it is
  1478.     redraw, key and button events.
  1479.   * To check for presence of a message in the queue use function 11.
  1480.     To wait without timeout use function 10.
  1481.   * Transmission ebx=0 results in immediate returning eax=0.
  1482.   * Current implementation returns immediately with eax=0,
  1483.     if the addition of ebx with the current value of time counter
  1484.     makes 32-bit overflow.
  1485.  
  1486. ======================================================================
  1487. ======== Function 24, subfunction 1 - begin to play CD-audio. ========
  1488. ======================================================================
  1489. Parameters:
  1490.   * eax = 24 - function number
  1491.   * ebx = 1 - subfunction number
  1492.   * ecx = 0x00FRSSMM, where
  1493.     * MM = starting minute
  1494.     * SS = starting second
  1495.     * FR = starting frame
  1496. Returned value:
  1497.   * eax = 0 - success
  1498.   * eax = 1 - CD base is not defined
  1499. Remarks:
  1500.   * Previously CD base must be defined by the call to
  1501.     subfunction 3 of function 21.
  1502.   * One second includes 75 frames, one minute includes 60 seconds.
  1503.   * The function is asynchronous (returns control, when play begins).
  1504.  
  1505. ======================================================================
  1506. ======= Function 24, subfunction 2 - get information on tracks. ======
  1507. ======================================================================
  1508. Parameters:
  1509.   * eax = 24 - function number
  1510.   * ebx = 2 - subfunction number
  1511.   * ecx = pointer to the buffer for the table
  1512.     (maximum 8*64h+4 bytes=100 tracks)
  1513. Returned value:
  1514.   * eax = 0 - success
  1515.   * eax = 1 - CD base is not defined
  1516. Remarks:
  1517.   * The format of the table with tracks information is the same as
  1518.     for ATAPI-CD command 43h (READ TOC), usual table (subcommand 00h).
  1519.     Function returns addresses in MSF.
  1520.   * Previously CD base port must be set by call to
  1521.     subfunction 3 of function 21.
  1522.   * Function returns information only about no more than 100
  1523.     first tracks. In most cases it is enough.
  1524.  
  1525. ======================================================================
  1526. ========== Function 24, subfunction 3 - stop play CD-audio. ==========
  1527. ======================================================================
  1528. Parameters:
  1529.   * eax = 24 - function number
  1530.   * ebx = 1 - subfunction number
  1531. Returned value:
  1532.   * eax = 0 - success
  1533.   * eax = 1 - CD base is not defined
  1534. Remarks:
  1535.   * Previously CD base port must be defined by call to
  1536.     subfunction 3 of function 21.
  1537.  
  1538. ======================================================================
  1539. ======= Function 24, subfunction 4 - eject tray of disk drive. =======
  1540. ======================================================================
  1541. Parameters:
  1542.   * eax = 24 - function number
  1543.   * ebx = 4 - subfunction number
  1544.   * ecx = position of CD/DVD-drive
  1545.       (from 0=Primary Master to 3=Secondary Slave)
  1546. Returned value:
  1547.   * function does not return value
  1548. Remarks:
  1549.   * The function is supported only for ATAPI devices (CD and DVD).
  1550.   * When the tray is being ejected,
  1551.     manual control of tray is unlocked.
  1552.   * When the tray is being ejected, the code clears the cache for
  1553.     corresponding device.
  1554.   * An example of usage of the function is the application CD_tray.
  1555.  
  1556. ======================================================================
  1557. ======== Function 24, subfunction 5 - load tray of disk drive. =======
  1558. ======================================================================
  1559. Parameters:
  1560.   * eax = 24 - function number
  1561.   * ebx = 5 - subfunction number
  1562.   * ecx = position of CD/DVD-drive
  1563.       (from 0=Primary Master to 3=Secondary Slave)
  1564. Returned value:
  1565.   * function does not return value
  1566. Remarks:
  1567.   * The function is supported only for ATAPI devices (CD and DVD).
  1568.   * An example of usage of the function is the application CD_tray.
  1569.  
  1570. ======================================================================
  1571. ======= Function 25 - put image area on the background layer. ========
  1572. ======================================================================
  1573. Paramters:
  1574.   * eax = 25 - function number
  1575.   * ebx = pointer to the previously allocated memory area,
  1576.         where placed the source images in a format BBGGRRTTBBGGRRTT...
  1577.   * ecx = [size on axis x]*65536 + [size on axis y]
  1578.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1579. Returned value:
  1580.   * function does not return value
  1581. Remarks:
  1582.   * Coordinates of the image are coordinates of the upper left corner
  1583.     of the image relative to the screen.
  1584.   * Size of the image in bytes is 4*xsize*ysize
  1585.   * TT - byte pointer of transparency, at current version:
  1586.          1 to FF - opaque, 0 - transparent.
  1587.   * The function places the image directly to LFB. It is not for
  1588.     background image f.15. Options f.15 to f.25 does not make sense.
  1589.  
  1590. ======================================================================
  1591. ======== Function 26, subfunction 1 - get MPU MIDI base port. ========
  1592. ======================================================================
  1593. Parameters:
  1594.   * eax = 26 - function number
  1595.   * ebx = 1 - subfunction number
  1596. Returned value:
  1597.   * eax = port number
  1598. Parameters:
  1599.   * To set base port use subfunction 1 of function 21.
  1600.  
  1601. ======================================================================
  1602. ========== Function 26, subfunction 2 - get keyboard layout. =========
  1603. ======================================================================
  1604. The keyboard layout is used to convert keyboard scancodes to
  1605. ASCII-codes for function 2.
  1606. Parameters:
  1607.   * eax = 26 - function number
  1608.   * ebx = 2 - subfunction number
  1609.   * ecx = what layout to get:
  1610.     * 1 = normal layout
  1611.     * 2 = layout with pressed Shift
  1612.     * 3 = layout with pressed Alt
  1613.   * edx = pointer to the 128-bytes buffer, where the layout will be
  1614.     copied
  1615. Returned value:
  1616.   * function does not return value
  1617. Or:
  1618.   * eax = 26 - function number
  1619.   * ebx = 2 - subfunction number
  1620.   * ecx = 9
  1621. Returned value:
  1622.   * eax = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1623. Remarks:
  1624.   * If Alt is pressed, the layout with Alt is used;
  1625.     if Alt is not pressed, but Shift is pressed,
  1626.     the layout with Shift is used;
  1627.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1628.     layout is used and then from the code is subtracted 0x60;
  1629.     if no control key is pressed, the normal layout is used.
  1630.   * To set layout and country identifier use
  1631.     subfunction 2 of function 21.
  1632.   * Country identifier is global system variable, which is not used
  1633.     by the kernel itself; however the application '@panel' displays
  1634.     the corresponding icon (using this function).
  1635.   * The application @panel switches layouts on user request.
  1636.  
  1637. ======================================================================
  1638. ============== Function 26, subfunction 3 - get CD base. =============
  1639. ======================================================================
  1640. Parameters:
  1641.   * eax = 26 - function number
  1642.   * ebx = 3 - subfunction number
  1643. Returned value:
  1644.   * eax = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1645. Remarks:
  1646.   * CD base is used by function 24.
  1647.   * To set CD base use subfunction 3 of function 21.
  1648.  
  1649. ======================================================================
  1650. ========== Function 26, subfunction 5 - get system language. =========
  1651. ======================================================================
  1652. Parameters:
  1653.   * eax = 26 - function number
  1654.   * ebx = 5 - subfunction number
  1655. Returned value:
  1656.   * eax = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1657. Remarks:
  1658.   * System language is global system variable and is not used
  1659.     by the kernel itself, however application @panel draws the
  1660.     appropriate icon (using this function).
  1661.   * To set system language use subfunction 5 of function 21.
  1662.  
  1663. ======================================================================
  1664. ============== Function 26, subfunction 7 - get HD base. =============
  1665. ======================================================================
  1666. The HD base defines hard disk to write with usage of obsolete
  1667. syntax /HD in obsolete function 58; at usage of modern syntax
  1668. /HD0,/HD1,/HD2,/HD3 base is set automatically.
  1669. Parameters:
  1670.   * eax = 26 - function number
  1671.   * ebx = 7 - subfunction number
  1672. Returned value:
  1673.   * eax = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1674. Remarks:
  1675.   * Any application in any time can change HD base.
  1676.   * To set base use subfunction 7 of function 21.
  1677.   * To get used partition of hard disk use subfunction 8.
  1678.  
  1679. ======================================================================
  1680. ========= Function 26, subfunction 8 - get used HD partition. ========
  1681. ======================================================================
  1682. The HD partition defines partition of the hard disk to write with
  1683. usage of obsolete syntax /HD in obsolete function 58;
  1684. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1685. base and partition are set automatically.
  1686. Parameters:
  1687.   * eax = 26 - function number
  1688.   * ebx = 8 - subfunction number
  1689. Returned value:
  1690.   * eax = HD partition (beginning from 1)
  1691. Remarks:
  1692.   * Any application in any time can change partition.
  1693.   * To set partition use subfunction 8 of function 21.
  1694.   * To get number of partitions on a hard disk use
  1695.     subfunction 11 of function 18.
  1696.   * To get base of used hard disk, use subfunction 7.
  1697.  
  1698. ======================================================================
  1699. === Function 26, subfunction 9 - get the value of the time counter. ==
  1700. ======================================================================
  1701. Parameters:
  1702.   * eax = 26 - function number
  1703.   * ebx = 9 - subfunction number
  1704. Returned value:
  1705.   * eax = number of 1/100s of second, past from the system boot time
  1706. Remarks:
  1707.   * Counter takes modulo 2^32, that correspond to a little more
  1708.     than 497 days.
  1709.   * To get system time use function 3.
  1710.  
  1711. ======================================================================
  1712. ===================== Function 26, subfunction 11 ====================
  1713. ========== Find out whether low-level HD access is enabled. ==========
  1714. ======================================================================
  1715. Parameters:
  1716.   * eax = 26 - function number
  1717.   * ebx = 11 - subfunction number
  1718. Returned value:
  1719.   * eax = 0/1 - disabled/enabled
  1720. Remarks:
  1721.   * Is used in LBA read (subfunction 8 of function 58).
  1722.   * To set current state use subfunction 11 of function 21.
  1723.  
  1724. ======================================================================
  1725. ===================== Function 26, subfunction 12 ====================
  1726. ========== Find out whether low-level PCI access is enabled. =========
  1727. ======================================================================
  1728. Parameters:
  1729.   * eax = 26 - function number
  1730.   * ebx = 12 - subfunction number
  1731. Returned value:
  1732.   * eax = 0/1 - disabled/enabled
  1733. Remarks:
  1734.   * Is used by operations with PCI bus (function 62).
  1735.   * The current implementation uses only low bit of ecx.
  1736.   * To set the current state use subfunction 12 of function 21.
  1737.  
  1738. ======================================================================
  1739. =================== Function 29 - get system date. ===================
  1740. ======================================================================
  1741. Parameters:
  1742.   * eax = 29 - function number
  1743. Returned value:
  1744.   * eax = 0x00DDMMYY, where
  1745.     (binary-decimal coding, BCD, is used)
  1746.   * YY = two low digits of year (00..99)
  1747.   * MM = month (01..12)
  1748.   * DD = day (01..31)
  1749. Remarks:
  1750.   * To set system date use function 22.
  1751.  
  1752. ======================================================================
  1753. ============= Function 30 - work with the current folder. ============
  1754. ======================================================================
  1755.  
  1756. --------- Subfunction 1 - set current folder for the thread. ---------
  1757. Parameters:
  1758.   * eax = 30 - function number
  1759.   * ebx = 1 - subfunction number
  1760.   * ecx = pointer to ASCIIZ-string with the path to new current folder
  1761. Returned value:
  1762.   * function does not return value
  1763.  
  1764. --------- Subfunction 2 - get current folder for the thread. ---------
  1765. Parameters:
  1766.   * eax = 30 - function number
  1767.   * ebx = 2 - subfunction number
  1768.   * ecx = pointer to buffer
  1769.   * edx = size of buffer
  1770. Returned value:
  1771.   * eax = size of the current folder's name (including terminating 0)
  1772. Remarks:
  1773.   * If the buffer is too small to hold all data, only first (edx-1)
  1774.     bytes are copied and than terminating 0 is inserted.
  1775.   * By default, current folder for the thread is "/rd/1".
  1776.   * At process/thread creation the current folder will be inherited
  1777.     from the parent.
  1778.  
  1779. --- Subfunction 3 - install the add.system directory for the kernel --
  1780. Parameters:
  1781.   * eax = 30 - function number
  1782.   * ebx = 3 - subfunction number
  1783.   * ecx = pointer to a block of data:
  1784.           sysdir_name     rb 64
  1785.           sysdir_path     rb 64
  1786. For example:
  1787. dir_name1       db 'KolibriOS',0
  1788.                 rb 64-10
  1789. dir_path1       db 'HD0/1',0
  1790.                 rb 64-6
  1791. Returned value:
  1792.   * function does not return value
  1793. Remarks:
  1794.   * The function can be called only 1 time for 1 session of the OS.
  1795.  
  1796. ======================================================================
  1797. ========= Function 34 - who owner the pixel on the screen. ===========
  1798. ======================================================================
  1799. Parameters:
  1800.   * eax = 34 - function number
  1801.   * ebx = x-coordinate (relative to the display)
  1802.   * ecx = y-coordinate (relative to the display)
  1803.  
  1804. Returned value:
  1805.   * eax = 0x000000XX - owner of pixel the slot window N
  1806.     If incorrect values ebx and ecx then function returns 0
  1807.   * The function takes the value from the area [_WinMapAddress]
  1808.  
  1809. ======================================================================
  1810. ======= Function 35 - read the color of a pixel on the screen. =======
  1811. ======================================================================
  1812. Parameters:
  1813.   * eax = 35
  1814.   * ebx = y*xsize+x, where
  1815.   * (x,y) = coordinates of a pixel (beginning from 0)
  1816.   * xsize = horizontal screen size
  1817. Returned value:
  1818.   * eax = color 0x00RRGGBB
  1819. Remarks:
  1820.   * To get screen sizes use function 14. Pay attention,
  1821.     that it subtracts 1 from both sizes.
  1822.   * There is also direct access (without any system calls)
  1823.     to videomemory through the selector gs. To get parameters of
  1824.     the current videomode, use function 61.
  1825.  
  1826. ======================================================================
  1827. =================== Function 36 - read screen area. ==================
  1828. ======================================================================
  1829. Paramters:
  1830.   * eax = 36 - function number
  1831.   * ebx = pointer to the previously allocated memory area,
  1832.         where will be placed the image in the format BBGGRRBBGGRR...
  1833.   * ecx = [size on axis x]*65536 + [size on axis y]
  1834.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1835. Returned value:
  1836.   * function does not return value
  1837. Remarks:
  1838.   * Coordinates of the image are coordinates of the upper left corner
  1839.     of the image relative to the screen.
  1840.   * Size of the image in bytes is 3*xsize*ysize.
  1841.  
  1842. ======================================================================
  1843. =================== Function 37 - work with mouse. ===================
  1844. ======================================================================
  1845.  
  1846. ---------- Subfunction 0 - screen coordinates of the mouse -----------
  1847. Parameters:
  1848.   * eax = 37 - function number
  1849.   * ebx = 0 - subfunction number
  1850. Returned value:
  1851.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1852.     (beginning from 0)
  1853.  
  1854. -- Subfunction 1 - coordinates of the mouse relative to the window ---
  1855. Parameters:
  1856.   * eax = 37 - function number
  1857.   * ebx = 1 - subfunction number
  1858. Returned value:
  1859.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1860.     relative to the application window (beginning from 0)
  1861. Remarks:
  1862.   * The value is calculated by formula (x-xwnd)*65536 + (y-ywnd).
  1863.     If y>=ywnd, the low word is non-negative and contains
  1864.     relative y-coordinate, and the high word - relative x-coordinate
  1865.     (with correct sign). Otherwise the low word is negative and still
  1866.     contains relative y-coordinate, and to the high word
  1867.     1 should be added.
  1868.  
  1869. ------------ Subfunction 2 - pressed buttons of the mouse ------------
  1870. Parameters:
  1871.   * eax = 37 - function number
  1872.   * ebx = 2 - subfunction number
  1873. Returned value:
  1874.   * eax contains information on the pressed mouse buttons:
  1875.   * bit 0 is set = left button is pressed
  1876.   * bit 1 is set = right button is pressed
  1877.   * bit 2 is set = middle button is pressed
  1878.   * bit 3 is set = 4th button is pressed
  1879.   * bit 4 is set = 5th button is pressed
  1880.   * other bits are cleared
  1881.  
  1882. -------------------- Subfunction 4 - load cursor ---------------------
  1883. Parameters:
  1884.   * eax = 37 - function number
  1885.   * ebx = 4 - subfunction number
  1886.   * dx = data source:
  1887.   * dx = LOAD_FROM_FILE = 0 - data in a file
  1888.     * ecx = pointer to full path to the cursor file
  1889.     * the file must be in the format .cur, which is standard for
  1890.       MS Windows, at that of the size 32*32 pixels
  1891.   * dx = LOAD_FROM_MEM = 1 - data of file are already loaded in memory
  1892.     * ecx = pointer to data of the cursor file
  1893.     * the data format is the same as in the previous case
  1894.   * dx = LOAD_INDIRECT = 2 - data in memory
  1895.     * ecx = pointer to cursor image in the format ARGB 32*32 pixels
  1896.     * edx = 0xXXYY0002, where
  1897.       * XX = x-coordinate of cursor hotspot
  1898.       * YY = y-coordinate
  1899.       * 0 <= XX, YY <= 31
  1900. Returned value:
  1901.   * eax = 0 - failed
  1902.   * otherwise eax = cursor handle
  1903.  
  1904. --------------------- Subfunction 5 - set cursor ---------------------
  1905. Sets new cursor for the window of the current thread.
  1906. Parameters:
  1907.   * eax = 37 - function number
  1908.   * ebx = 5 - subfunction number
  1909.   * ecx = cursor handle
  1910. Returned value:
  1911.   * eax = handle of previous cursor
  1912. Remarks:
  1913.   * If the handle is incorrect, the function restores the default
  1914.     cursor (standard arrow). In particular, ecx=0 restores it.
  1915.  
  1916. ------------------- Subfunction 6 - delete cursor --------------------
  1917. Parameters:
  1918.   * eax = 37 - function number
  1919.   * ebx = 6 - subfunction number
  1920.   * ecx = cursor handle
  1921. Returned value:
  1922.   * eax destroyed
  1923. Remarks:
  1924.   * The cursor must be loaded previously by the current thread
  1925.     (with the call to subfunction 4). The function does not delete
  1926.     system cursors and cursors, loaded by another applications.
  1927.   * If the active cursor (set by subfunction 5) is deleted,
  1928.     the system restores the default cursor (standard arrow).
  1929.  
  1930. ------------------ Subfunction 7 - get scroll data -------------------
  1931. Parameters:
  1932.   * eax = 37 - function number
  1933.   * ebx = 7 - subfunction number
  1934. Returned value:
  1935.   * eax = [horizontal offset]*65536 + [vertical offset]
  1936. Remarks:
  1937.   * Scroll data is available for active window only.
  1938.   * Values are zeroed after reading.
  1939.   * Values are signed.
  1940.  
  1941. ======================================================================
  1942. ====================== Function 38 - draw line. ======================
  1943. ======================================================================
  1944. Parameters:
  1945.   * eax = 38 - function number
  1946.   * ebx = [start coordinate on axis x]*65536 +
  1947.               [end coordinate on axis x]
  1948.   * ecx = [start coordinate on axis y]*65536 +
  1949.               [end coordinate on axis y]
  1950.   * edx = 0x00RRGGBB - color
  1951.     edx = 0x01xxxxxx - draw inversed line
  1952.           (low 24 bits are ignored)
  1953. Returned value:
  1954.   * function does not return value
  1955. Remarks:
  1956.   * Coordinates are relative to the window.
  1957.   * End point is also drawn.
  1958.  
  1959. ======================================================================
  1960. == Function 39, subfunction 1 - get a size of the background image. ==
  1961. ======================================================================
  1962. Parameters:
  1963.   * eax = 39 - function number
  1964.   * ebx = 1 - subfunction number
  1965. Returned value:
  1966.   * eax = [width]*65536 + [height]
  1967. Remarks:
  1968.   * There is a pair function to set sizes of background image -
  1969.     subfunction 1 of function 15. After which it is necessary,
  1970.     of course, anew to define image.
  1971.  
  1972. ======================================================================
  1973. == Function 39, subfunction 2 - get pixel from the background image. =
  1974. ======================================================================
  1975. Parameters:
  1976.   * eax = 39 - function number
  1977.   * ebx = 2 - subfunction number
  1978.   * ecx = offset
  1979. Returned value:
  1980.   * eax = 0x00RRGGBB - pixel color, if offset is valid
  1981.     (less than 0x160000-16)
  1982.   * eax = 2 otherwise
  1983. Remarks:
  1984.   * Do not rely on returned value for invalid offsets, it may be
  1985.     changed in future kernel versions.
  1986.   * Offset for pixel with coordinates (x,y)
  1987.     is calculated as (x+y*xsize)*3.
  1988.   * There is a pair function to set pixel on the background image -
  1989.     subfunction 2 of function 15.
  1990.  
  1991. ======================================================================
  1992. == Function 39, subfunction 4 - get drawing mode for the background. =
  1993. ======================================================================
  1994. Parameters:
  1995.   * eax = 39 - function number
  1996.   * ebx = 4 - subfunction number
  1997. Returned value:
  1998.   * eax = 1 - tile
  1999.   * eax = 2 - stretch
  2000. Remarks:
  2001.   * There is a pair function to set drawing mode -
  2002.     subfunction 4 of function 15.
  2003.  
  2004. ======================================================================
  2005. =========== Function 40 - set the mask for expected events. ==========
  2006. ======================================================================
  2007. The mask for expected events affects function working with events
  2008. 10, 11, 23 - they notify only about events allowed by this mask.
  2009. Parameters:
  2010.   * eax = 40 - function number
  2011.   * ebx = mask: bit i corresponds to event i+1 (see list of events)
  2012.     (set bit permits notice on event)
  2013.     bit 31: mouse active/inactive filter
  2014.     bit 31 = 0 - inactive window receive mouse events
  2015.     bit 31 = 1 - inactive window does not receive mouse events
  2016.     bit 30: cursor position filter
  2017.     bit 30 = 0 = the window receive mouse events if cursor
  2018.                  outside window
  2019.     bit 30 = 1 - the window does not receive mouse events if cursor
  2020.                  outside window
  2021. Returned value:
  2022.   * eax = previous value of mask
  2023. Remarks:
  2024.   * Default mask (7=111b) enables nofices about redraw,
  2025.     keys and buttons. This is enough for many applications.
  2026.   * Events prohibited in the mask are saved anyway, when come;
  2027.     they are simply not informed with event functions.
  2028.   * Event functions take into account the mask on moment of
  2029.     function call, not on moment of event arrival.
  2030.  
  2031.  
  2032. ======================================================================
  2033. ================ Function 43 - input/output to a port. ===============
  2034. ======================================================================
  2035.  
  2036. ------------------------ Output data to port -------------------------
  2037. Parameters:
  2038.   * eax = 43 - function number
  2039.   * bl = byte for output
  2040.   * ecx = port number 0xnnnn (from 0 to 0xFFFF)
  2041. Returned value:
  2042.   * eax = 0 - success
  2043.   * eax = 1 - the thread has not reserved the selected port
  2044.  
  2045. ------------------------ Input data from port ------------------------
  2046. Parameters:
  2047.   * eax = 43 - function number
  2048.   * ebx is ignored
  2049.   * ecx = 0x8000nnnn, where nnnn = port number (from 0 to 0xFFFF)
  2050. Returned value:
  2051.   * eax = 0 - success, thus ebx = entered byte
  2052.   * eax = 1 - the thread has not reserved the selected port
  2053. Remarks:
  2054.   * Previously the thread must reserve the selected port
  2055.     for itself by function 46.
  2056.   * Instead of call to this function it is better to use
  2057.     processor instructions in/out - this is much
  2058.     faster and a bit shorter and easier.
  2059.  
  2060.  
  2061. ======================================================================
  2062. ====== Function 46 - reserve/free a group of input/output ports. =====
  2063. ======================================================================
  2064. To work with reserved ports an application can access directly by
  2065. commands in/out (recommended way) and can use function 43
  2066. (not recommended way).
  2067. Parameters:
  2068.   * eax = 46 - function number
  2069.   * ebx = 0 - reserve, 1 - free
  2070.   * ecx = start port number
  2071.   * edx = end port number (inclusive)
  2072. Returned value:
  2073.   * eax = 0 - success
  2074.   * eax = 1 - error
  2075. Remarks:
  2076.   * For ports reservation: an error occurs if and only if
  2077.     one from the following condition satisfies:
  2078.     * start port is more than end port;
  2079.     * the selected range contains incorrect port number
  2080.       (correct are from 0 to 0xFFFF);
  2081.     * limit for the total number of reserved areas is exceeded
  2082.       (maximum 255 are allowed);
  2083.     * the selected range intersects with any of earlier reserved
  2084.   * For ports free: an error is an attempt to free range,
  2085.     that was not earlier reserved by this function
  2086.     (with same ecx,edx).
  2087.   * If an error occurs (for both cases) function performs no action.
  2088.   * At booting the system reserves for itself ports
  2089.     0..0x2d, 0x30..0x4d, 0x50..0xdf, 0xe5..0xff (inclusively).
  2090.   * When a thread terminates, all reserved by it ports
  2091.     are freed automatically.
  2092.  
  2093. ======================================================================
  2094. ============= Function 47 - draw a number in the window. =============
  2095. ======================================================================
  2096. Parameters:
  2097.   * eax = 47 - function number
  2098.   * ebx = parameters of conversion number to text:
  2099.     * bl = 0 - ecx contains number
  2100.     * bl = 1 - ecx contains pointer to dword/qword-number
  2101.     * bh = 0 - display in decimal number system
  2102.     * bh = 1 - display in hexadecimal system
  2103.     * bh = 2 - display in binary system
  2104.     * bits 16-21 = how many digits to display
  2105.     * bits 22-29 reserved and must be set to 0
  2106.     * bit 30 set = display qword (64-bit) number (must be bl=1)
  2107.     * bit 31 set = do not display leading zeroes of the number
  2108.   * ecx = number (if bl=0) or pointer (if bl=1)
  2109.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  2110.   * esi = 0xX0RRGGBB:
  2111.     * RR, GG, BB specify the color
  2112.     * X = ABnn (bits)
  2113.     * nn = font (0/1)
  2114.     * A is ignored
  2115.     * B=1 - fill background with the color edi
  2116. Returned value:
  2117.   * function does not return value
  2118. Remarks:
  2119.   * The given length must not exceed 60.
  2120.   * The exactly given amount of digits is output. If number is small
  2121.     and can be written by smaller amount of digits, it is supplemented
  2122.     by leading zeroes; if the number is big and can not be written by
  2123.     given amount of digits, extra digits are not drawn.
  2124.   * Parameters of fonts are shown in the description of function 4
  2125.     (text output).
  2126.  
  2127. ======================================================================
  2128. ========= Function 48, subfunction 0 - apply screen settings. ========
  2129. ======================================================================
  2130. Parameters:
  2131.   * eax = 48 - function number
  2132.   * ebx = 0 - subfunction number
  2133.   * ecx = 0 - reserved
  2134. Returned value:
  2135.   * function does not return value
  2136. Remarks:
  2137.   * Function redraws the screen after parameters change by
  2138.     subfunctions 1 and 2.
  2139.   * Function call without prior call to one of indicated subfunctions
  2140.     is ignored.
  2141.   * Function call with nonzero ecx is ignored.
  2142.  
  2143. ======================================================================
  2144. =========== Function 48, subfunction 1 - set button style. ===========
  2145. ======================================================================
  2146. Parameters:
  2147.   * eax = 48 - function number
  2148.   * ebx = 1 - subfunction number
  2149.   * ecx = button style:
  2150.     * 0 = flat
  2151.     * 1 = 3d
  2152. Returned value:
  2153.   * function does not return value
  2154. Remarks:
  2155.   * After call to this function one should redraw the screen by
  2156.     subfunction 0.
  2157.   * Button style influences only to their draw of function 8.
  2158.  
  2159. ======================================================================
  2160. ====== Function 48, subfunction 2 - set standard window colors. ======
  2161. ======================================================================
  2162. Parameters:
  2163.   * eax = 48 - function number
  2164.   * ebx = 2 - subfunction number
  2165.   * ecx = pointer to the color table
  2166.   * edx = size of the color table
  2167.     (must be 40 bytes for future compatibility)
  2168. Format of the color table is shown in description of subfunction 3.
  2169. Returned value:
  2170.   * function does not return value
  2171. Remarks:
  2172.   * After call to this function one should redraw the screen by
  2173.     subfunction 0.
  2174.   * Table of standard colors influences only to applications,
  2175.     which receive this table obviously (by subfunction 3)
  2176.     and use it (specifying colors from it to drawing functions).
  2177.   * Table of standard colors is included in skin and is installed
  2178.     anew with skin installation (by subfunction 8).
  2179.   * Color table can be viewed/changed interactively with
  2180.     the application 'desktop'.
  2181.  
  2182. ======================================================================
  2183. ====== Function 48, subfunction 3 - get standard window colors. ======
  2184. ======================================================================
  2185. Parameters:
  2186.   * eax = 48 - function number
  2187.   * ebx = 3 - subfunction number
  2188.   * ecx = pointer to the buffer with size edx bytes,
  2189.     where table will be written
  2190.   * edx = size of color table
  2191.     (must be 40 bytes for future compatibility)
  2192. Returned value:
  2193.   * function does not return value
  2194. Format of the color table:
  2195. each item is dword-value for color 0x00RRGGBB
  2196.   * +0: dword: frames - color of frame
  2197.   * +4: dword: grab - color of header
  2198.   * +8: dword: grab_button - color of button on header bar
  2199.   * +12 = +0xC: dword: grab_button_text - color of text on button
  2200.     on header bar
  2201.   * +16 = +0x10: dword: grab_text - color of text on header
  2202.   * +20 = +0x14: dword: work - color of working area
  2203.   * +24 = +0x18: dword: work_button - color of button in working area
  2204.   * +28 = +0x1C: dword: work_button_text - color of text on button
  2205.     in working area
  2206.   * +32 = +0x20: dword: work_text - color of text in working area
  2207.   * +36 = +0x24: dword: work_graph - color of graphics in working area
  2208. Remarks:
  2209.   * Structure of the color table is described in the standard
  2210.     include file 'macros.inc' as 'system_colors'; for example,
  2211.     it is possible to write:
  2212.         sc      system_colors           ; variable declaration
  2213.         ...                             ; somewhere one must call
  2214.                                         ; this function with ecx=sc
  2215.         mov     ecx, [sc.work_button_text]      ; read text color on
  2216.                                         ; buttin in working area
  2217.   * A program itself desides to use or not to use color table.
  2218.     For usage program must simply at calls to drawing functions select
  2219.     color taken from the table.
  2220.   * At change of the table of standard colors (by subfunction 2 with
  2221.     the subsequent application of changes by subfunction 0 or
  2222.     at skin set by subfunction 8) the system sends to all windows
  2223.     redraw message (the event with code 1).
  2224.   * Color table can be viewed/changed interactively with
  2225.     the application 'desktop'.
  2226.  
  2227. ======================================================================
  2228. ============ Function 48, subfunction 4 - get skin height. ===========
  2229. ======================================================================
  2230. Parameters:
  2231.   * eax = 48 - function number
  2232.   * ebx = 4 - subfunction number
  2233. Returned value:
  2234.   * eax = skin height
  2235. Remarks:
  2236.   * Skin height is defined as the height of a header
  2237.     of skinned windows.
  2238.   * See also general structure of window in the description
  2239.     of function 0.
  2240.  
  2241. ======================================================================
  2242. ======== Function 48, subfunction 5 - get screen working area. =======
  2243. ======================================================================
  2244. Parameters:
  2245.   * eax = 48 - function number
  2246.   * ebx = 5 - subfunction number
  2247. Returned value:
  2248.   * eax = [left]*65536 + [right]
  2249.   * ebx = [top]*65536 + [bottom]
  2250. Remarks:
  2251.   * The screen working area defines position and coordinates of
  2252.     a maximized window.
  2253.   * The screen working area in view of normal work is all screen
  2254.     without system panel (the application '@panel').
  2255.   * (left,top) are coordinates of the left upper corner,
  2256.     (right,bottom) are coordinates of the right lower one.
  2257.     Thus the size of working area on x axis can be calculated by
  2258.     formula right-left+1, on y axis - by formula bottom-right+1.
  2259.   * See also function 14,
  2260.     to get sizes of all screen.
  2261.   * There is a pair function to set working area - subfunction 6.
  2262.  
  2263. ======================================================================
  2264. ======== Function 48, subfunction 6 - set screen working area. =======
  2265. ======================================================================
  2266. Parameters:
  2267.   * eax = 48 - function number
  2268.   * ebx = 6 - subfunction number
  2269.   * ecx = [left]*65536 + [right]
  2270.   * edx = [top]*65536 + [bottom]
  2271. Returned value:
  2272.   * function does not return value
  2273. Remarks:
  2274.   * The screen working area defines position and coordinates of
  2275.     a maximized window.
  2276.   * This function is used only by the application '@panel',
  2277.     which set working area to all screen without system panel.
  2278.   * (left,top) are coordinates of the left upper corner,
  2279.     (right,bottom) are coordinates of the right lower one.
  2280.     Thus the size of working area on x axis can be calculated by
  2281.     formula right-left+1, on y axis - by formula bottom-right+1.
  2282.   * If 'left'>='right', x-coordinate of working area is not changed.
  2283.     If 'left'<0, 'left' will not be set. If 'right' is greater than or
  2284.     equal to screen width, 'right' will not be set.
  2285.     Similarly on y axis.
  2286.   * See also function 14,
  2287.     to get sizes of all screen.
  2288.   * There is a pair function to get working area - subfunction 5.
  2289.   * This function redraws the screen automatically,
  2290.     updating coordinates and sizes of maximized windows.
  2291.     The system sends to all windows redraw message (the event 1).
  2292.  
  2293. ======================================================================
  2294. =========== Function 48, subfunction 7 - get skin margins. ===========
  2295. ======================================================================
  2296. Returns the area of a header of a skinned window, intended for
  2297. a text of a header.
  2298. Parameters:
  2299.   * eax = 48 - function number
  2300.   * ebx = 7 - subfunction number
  2301. Returned value:
  2302.   * eax = [left]*65536 + [right]
  2303.   * ebx = [top]*65536 + [bottom]
  2304. Remarks:
  2305.   * An application decides itself to use or not to use this function.
  2306.   * It is recommended to take into account returned value
  2307.     of this function for choice of a place for drawing header text
  2308.     (by function 4) or a substitute of header text
  2309.     (at the discretion of an application).
  2310.  
  2311. ======================================================================
  2312. ============= Function 48, subfunction 8 - set used skin. ============
  2313. ======================================================================
  2314. Parameters:
  2315.   * eax = 48 - function number
  2316.   * ebx = 8 - subfunction number
  2317.   * ecx = pointer to a block for function 58, in
  2318.     which the fields of intermediate buffer and file name are filled
  2319. Returned value:
  2320.   * eax = 0 - success
  2321.   * otherwise eax = file system error code; if file does not
  2322.     contain valid skin, function returns error 3
  2323.     (unknown file system).
  2324. Remarks:
  2325.   * After successful skin loading the system sends to all windows
  2326.     redraw message (the event 1).
  2327.   * At booting the system reads skin from file 'default.skn'
  2328.     on ramdisk.
  2329.   * User can change the skin statically by creating hisself
  2330.     'default.skn' or dynamically with the application 'desktop'.
  2331.  
  2332. ======================================================================
  2333. =========== Function 49 - Advanced Power Management (APM). ===========
  2334. ======================================================================
  2335. Parameters:
  2336.   * eax = 49 - function number
  2337.   * dx = number of the APM function
  2338.     (analogue of ax in APM specification)
  2339.   * bx, cx = parameters of the APM function
  2340. Returned value:
  2341.   * 16-bit registers ax, bx, cx, dx, si, di and carry flag CF
  2342.     are set according to the APM specification
  2343.   * high halves of 32-bit registers eax, ebx, ecx,
  2344.     edx, esi, edi are destroyed
  2345. Remarks:
  2346.   * APM 1.2 specification is described in the document
  2347.     "Advanced Power Management (APM) BIOS Specification"
  2348.     (Revision 1.2), available at
  2349.     http://www.microsoft.com/whdc/archive/amp_12.mspx;
  2350.     besides it is included in famous Interrupt List by Ralf Brown
  2351.     (http://www.pobox.com/~ralf/files.html,
  2352.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/).
  2353.  
  2354. ======================================================================
  2355. =================== Function 50 - set window shape. ==================
  2356. ======================================================================
  2357. Normal windows have rectangular shape. This function can give to
  2358. a window any shape. The shape is given by a set of points inside
  2359. the base rectangle belonging to a window. Position and coordinates
  2360. of the base rectangle are set by function 0
  2361. and changed by function 67.
  2362.  
  2363. --------------------------- Set shape data ---------------------------
  2364. Parameters:
  2365.   * eax = 50 - function number
  2366.   * ebx = 0 - subfunction number
  2367.   * ecx = pointer to shape data (array of bytes 0/1)
  2368. Returned value:
  2369.   * function does not return value
  2370.  
  2371. -------------------------- Set shape scale ---------------------------
  2372. Parameters:
  2373.   * eax = 50 - function number
  2374.   * ebx = 1 - subfunction number
  2375.   * ecx sets a scale: each byte of data defines
  2376.     (2^scale)*(2^scale) pixels
  2377. Returned value:
  2378.   * function does not return value
  2379. Remarks:
  2380.   * Default scale is 0 (scale factor is 1). If in the shape data
  2381.     one byte corresponds to one pixel, there is no necessity
  2382.     to set scale.
  2383.   * Let's designate xsize = window width (in pixels), ysize = height;
  2384.     pay attention, that they are one pixel more than defined by
  2385.     functions 0, 67.
  2386.   * On definition of scale xsize and ysize must be divisible
  2387.     on 2^scale.
  2388.   * Byte of data on offset 'a' must be 0/1 and defines belonging
  2389.     to a window of square with the side 2^scale (if scale=0,
  2390.     this is one pixel) and coordinates of the left upper corner
  2391.     (a mod (xsize shr scale), a div (xsize shr scale))
  2392.   * Data size: (xsize shr scale)*(ysize shr scale).
  2393.   * Data must be presented in the memory and not change
  2394.     after set of shape.
  2395.   * The system views the shape data at every window redraw by
  2396.     function 0.
  2397.   * The call of subfunction 0 with NULL pointer results in return
  2398.     to the rectangular shape.
  2399.  
  2400. ======================================================================
  2401. ==================== Function 51 - create thread. ====================
  2402. ======================================================================
  2403. Parameters:
  2404.   * eax = 51 - function number
  2405.   * ebx = 1 - unique subfunction
  2406.   * ecx = address of thread entry point (starting eip)
  2407.   * edx = pointer to thread stack (starting esp)
  2408. Returned value:
  2409.   * eax = -1 - error (there is too many threads)
  2410.   * otherwise eax = TID - thread identifier
  2411.     </UL>
  2412.  
  2413. ======================================================================
  2414.  Function 55, subfunction 55 - begin to play data on built-in speaker.
  2415. ======================================================================
  2416. Parameters:
  2417.   * eax = 55 - function number
  2418.   * ebx = 55 - subfunction number
  2419.   * esi = pointer to data
  2420. Returned value:
  2421.   * eax = 0 - success
  2422.   * eax = 55 - error (speaker is off or busy)
  2423. Data is an array of items with variable length.
  2424. Format of each item is defined by first byte:
  2425.   * 0 = end of data
  2426.   * 1..0x80 = sets sound duration on 1/100 of second; sound note
  2427.     is defined by immediate value of frequency
  2428.     * following word (2 bytes) contains frequency divider;
  2429.       frequency is defined as 1193180/divider
  2430.   * 0x81 = invalid
  2431.   * 0x82..0xFF = note is defined by octave and number:
  2432.     * duration in 1/100 of second = (first byte)-0x81
  2433.     * there is one more byte;
  2434.     * (second byte)=0xFF - delay
  2435.     * otherwise it looks like a*0x10+b, where b=number of the note in
  2436.       an octave from 1 to 12, a=number of octave (beginning from 0)
  2437. Remarks:
  2438.   * Speaker play can be disabled/enabled by
  2439.     subfunction 8 of function 18.
  2440.   * Function returns control, having informed the system
  2441.     an information on request. Play itself goes independently from
  2442.     the program.
  2443.   * The data must be kept in the memory at least up to the end
  2444.     of play.
  2445.  
  2446. ======================================================================
  2447. ======================= Function 57 - PCI BIOS. ======================
  2448. ======================================================================
  2449. Parameters:
  2450.   * eax = 57 - function number
  2451.   * ebp corresponds to al in PCI BIOS specification
  2452.   * other registers are set according to PCI BIOS specification
  2453. Returned value:
  2454.   * CF is undefined
  2455.   * other registers are set according to PCI BIOS specification
  2456. Remarks:
  2457.   * Many effects of this function can be also achieved with
  2458.     corresponding subfunctions of function 62.
  2459.   * The function calls PCI32 BIOS extension, documented e.g. in
  2460.     http://alpha1.dyns.net/files/PCI/bios21.pdf.
  2461.   * If BIOS does not support this extension, its behavior is emulated
  2462.     (through kernel-mode analogues of subfunctions of function 62).
  2463.  
  2464. ======================================================================
  2465. ================ Function 58 - work with file system. ================
  2466. ======================================================================
  2467. Parameters:
  2468.   * eax = 58
  2469.   * ebx = pointer to the information structure
  2470. Returned value:
  2471.   * eax = 0 - success; otherwise file system error code
  2472.   * some subfunctions return value in other registers too
  2473. General format of the information structure:
  2474.   * +0: dword: subfunction number
  2475.   * +4: dword: number of block
  2476.   * +8: dword: size
  2477.   * +12 = +0xC: dword: pointer to data
  2478.   * +16 = +0x10: dword: pointer to a memory for system operations
  2479.     (4096 bytes)
  2480.   * +20 = +0x14: n db: ASCIIZ-string with the file name
  2481. Specifications - in documentation on the appropriate subfunction.
  2482. Filename is case-insensitive for latin letters, russian letters
  2483. must be capital.
  2484. Format of filename:
  2485. /base/number/dir1/dir2/.../dirn/file,
  2486. where /base/number identifies device, on which file is located:
  2487. one of
  2488.   * /RD/1 = /RAMDISK/1 to access ramdisk
  2489.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  2490.     /FD/2 = /FLOPPYDISK/2 to access second one
  2491.   * /HD/x = /HARDDISK/x - obsolete variant of access to hard disk
  2492.     (in this case base is defined by subfunction 7 of function 21),
  2493.     x - partition number (beginning from 1)
  2494.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  2495.     IDE0 (Primary Master), IDE1 (Primary Slave),
  2496.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  2497.     x - partition number on the selected hard drive, varies from 1
  2498.     to 255 (on each hard drive the indexing starts from 1)
  2499. Remarks:
  2500.   * In the first two cases it is also possible to use FIRST
  2501.     instead of 1, SECOND instead of 2, but it is not recommended
  2502.     for convenience of transition to the future extensions.
  2503.   * Limitation n<=39 is imposed.
  2504.   * Names of folders and file dir1,...,dirn,file must have the
  2505.     format 8.3: name no more than 8 characters, dot, extension no
  2506.     more than 3 characters. Trailing spaces are ignored, no other
  2507.     spaces is allowed. If name occupies equally 8 characters,
  2508.     dot may be omitted (though it is not recommended to use this
  2509.     feature for convenience of transition to the future extensions).
  2510.   * This function does not support folders on ramdisk.
  2511. Examples:
  2512.   * '/RAMDISK/FIRST/KERNEL.ASM',0
  2513.     '/rd/1/kernel.asm',0
  2514.   * '/HD0/1/kernel.asm',0
  2515.   * '/hd0/1/menuet/pics/tanzania.bmp',0
  2516. Existing subfunctions:
  2517.   * subfunction 0 - read file/folder
  2518.   * subfunction 8 - LBA-read from device
  2519.   * subfunction 15 - get file system information
  2520.  
  2521. ======================================================================
  2522. =========== Function 58, subfunction 0 - read file/folder. ===========
  2523. ======================================================================
  2524. Parameters:
  2525.   * eax = 58
  2526.   * ebx = pointer to the information structure
  2527. Format of the information structure:
  2528.   * +0: dword: 0 = subfunction number
  2529.   * +4: dword: first block to read (beginning from 0)
  2530.   * +8: dword: amount of blocks to read
  2531.   * +12 = +0xC: dword: pointer to buffer for data
  2532.   * +16 = +0x10: dword: pointer to buffer for system operations
  2533.     (4096 bytes)
  2534.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2535.     given in the general description
  2536. Returned value:
  2537.   * eax = 0 - success, otherwise file system error code
  2538.   * ebx = file size (in bytes) or -1=0xffffffff, if file was not found
  2539. Remarks:
  2540.   * Block size is 512 bytes.
  2541.   * This function is obsolete, for reading files use subfunction 0
  2542.     of function 70, for reading folders - subfunction 1 of
  2543.     function 70.
  2544.   * Function can read contents of a folder. Only FAT file system is
  2545.     supported. The format of FAT-folder is described
  2546.     in any FAT documentation.
  2547.   * Size of a folder is determined by size of FAT clusters chain.
  2548.   * If file was ended before last requested block was read,
  2549.     the function will read as many as it can, and after that return
  2550.     eax=6 (EOF).
  2551.   * Function can read root folders /rd/1,/fd/x,/hd[n]/x, but
  2552.     in the first two cases the current implementation does not follow
  2553.     to the declared rules:
  2554.     for /rd/1:
  2555.     * if one want to read 0 blocks, function considers,
  2556.       that he requested 1;
  2557.     * if one requests more than 14 blocks or starting block is
  2558.       not less than 14, function returns eax=5 (not found) and ebx=-1;
  2559.     * size of ramdisk root folder is 14 blocks,
  2560.       0x1C00=7168 bytes; but function returns ebx=0
  2561.       (except of the case of previous item);
  2562.     * strangely enough, it is possible to read 14th block (which
  2563.       generally contains a garbage - I remind, the indexing begins
  2564.       from 0);
  2565.     * if some block with the number not less than 14 was requested,
  2566.       function returns eax=6(EOF); otherwise eax=0.
  2567.     For /fd/x:
  2568.     * if the start block is not less than 14, function returns
  2569.       eax=5 (not found) and ebx=0;
  2570.     * note that format of FAT12 allows floppies with the root size
  2571.       more or less than 14 blocks;
  2572.     * check for length is not performed;
  2573.     * if data was successful read, function returns
  2574.       eax=0,ebx=0; otherwise eax=10 (access denied), ebx=-1.
  2575.   * The function handles reading of special folders /,/rd,/fd,/hd[n];
  2576.     but the result does not correspond to expected (on operations with
  2577.     normal files/folders), does not follow the declared rules,
  2578.     may be changed in future versions of the kernel and consequently
  2579.     is not described. To obtain the information about the equipment
  2580.     use subfunction 11 of function 18 or
  2581.     read corresponding folder with subfunction 1 of function 70.
  2582.  
  2583. ======================================================================
  2584. ========= Function 58, subfunction 8 - LBA-read from device. =========
  2585. ======================================================================
  2586. Parameters:
  2587.   * eax = 58 - function number
  2588.   * ebx = pointer to the information structure
  2589. Format of the information structure:
  2590.   * +0: dword: 8 = subfunction number
  2591.   * +4: dword: number of block to read (beginning from 0)
  2592.   * +8: dword: ignored (set to 1)
  2593.   * +12 = +0xC: dword: pointer to buffer for data (512 bytes)
  2594.   * +16 = +0x10: dword: pointer to buffer for system operations
  2595.     (4096 bytes)
  2596.   * +20 = +0x14: ASCIIZ-name of device: case-insensitive, one of
  2597.     /rd/1 = /RamDisk/1, /hd/n = /HardDisk/n,
  2598.     1<=n<=4 - number of device: 1=IDE0, ..., 4=IDE3.
  2599.     Instead of digits it is allowed, though not recommended for
  2600.     convenience of transition to future extensions, to use
  2601.     'first','second','third','fourth'.
  2602. Returned value:
  2603.   * for device name /hd/xxx, where xxx is not in the list above:
  2604.     * eax = ebx = 1
  2605.   * for invalid device name (except for the previous case):
  2606.     * eax = 5
  2607.     * ebx does not change
  2608.   * if LBA-access is disabled by subfunction 11 of function 21:
  2609.     * eax = 2
  2610.     * ebx destroyed
  2611.   * for ramdisk: attempt to read block outside ramdisk
  2612.     (18*2*80 blocks) results in
  2613.     * eax = 3
  2614.     * ebx = 0
  2615.   * for successful read:
  2616.     * eax = ebx = 0
  2617. Remarks:
  2618.   * Block size is 512 bytes; function reads one block.
  2619.   * Do not depend on returned value, it can be changed
  2620.     in future versions.
  2621.   * Function requires that LBA-access to devices is enabled by
  2622.     subfunction 11 of function 21. To check this one can use
  2623.     subfunction 11 of function 26.
  2624.   * LBA-read of floppy is not supported.
  2625.   * Function reads data on physical hard drive; if for any reason
  2626.     data of the concrete partition are required, application must
  2627.     define starting sector of this partition (either directly
  2628.     through MBR, or from the full structure returned by
  2629.     subfunction 11 of function 18).
  2630.   * Function does not check error code of hard disk, so request of
  2631.     nonexisting sector reads something (most probably it will be
  2632.     zeroes, but this is defined by device) and this is considered
  2633.     as success (eax=0).
  2634.  
  2635. ======================================================================
  2636. ==== Function 58, subfunction 15 - get information on file system. ===
  2637. ======================================================================
  2638. Parameters:
  2639.   * eax = 58 - function number
  2640.   * ebx = pointer to the information structure
  2641. Format of the information structure:
  2642.   * +0: dword: 15 = subfunction number
  2643.   * +4: dword: ignored
  2644.   * +8: dword: ignored
  2645.   * +12 = +0xC: dword: ignored
  2646.   * +16 = +0x10: dword: ignored
  2647.   * +20 = +0x14: (only second character is checked)
  2648.     /rd=/RAMDISK or /hd=/HARDDISK
  2649. Returned value:
  2650.   * if the second character does not belong to set {'r','R','h','H'}:
  2651.     * eax = 3
  2652.     * ebx = ecx = dword [fileinfo] = 0
  2653.   * for ramdisk:
  2654.     * eax = 0 (success)
  2655.     * ebx = total number of clusters = 2847
  2656.     * ecx = number of free clusters
  2657.     * dword [fileinfo] = cluster size = 512
  2658.   * for hard disk: base and partition are defined by subfunctions
  2659.     7 and 8 of function 21:
  2660.     * eax = 0 (success)
  2661.     * ebx = total number of clusters
  2662.     * ecx = number of free clusters
  2663.     * dword [fileinfo] = cluster size (in bytes)
  2664. Remarks:
  2665.   * Be not surprised to strange layout of 4th returned parameter
  2666.     - when this code was writing, at system calls application got
  2667.     only registers eax,ebx,ecx (from pushad-structure transmitted
  2668.     as argument to the system function). Now it is corrected, so,
  2669.     probably, it is meaningful to return cluster size in edx, while
  2670.     this function is not used yet.
  2671.   * There exists also subfunction 11 of function 18,
  2672.     which returns information on file system. From the full table
  2673.     of disk subsystem it is possible to deduce cluster size (there
  2674.     it is stored in sectors) and total number of clusters
  2675.     for hard disks.
  2676.  
  2677. ======================================================================
  2678. ========== Function 60 - Inter Process Communication (IPC). ==========
  2679. ======================================================================
  2680. IPC is used for message dispatching from one process/thread to
  2681. another. Previously it is necessary to agree how to interpret
  2682. the concrete message.
  2683.  
  2684. ----------- Subfunction 1 - set the area for IPC receiving -----------
  2685. Is called by process-receiver.
  2686. Parameters:
  2687.   * eax = 60 - function number
  2688.   * ebx = 1 - subfunction number
  2689.   * ecx = pointer to the buffer
  2690.   * edx = size of the buffer
  2691. Returned value:
  2692.   * eax = 0 - always success
  2693. Format of IPC-buffer:
  2694.   * +0: dword: if nonzero, buffer is considered locked;
  2695.     lock/unlock the buffer, when you work with it and need that
  2696.     buffer data are not changed from outside (no new messages)
  2697.   * +4: dword: occupied place in the buffer (in bytes)
  2698.   * +8: first message
  2699.   * +8+n: second message
  2700.   * ...
  2701. Format of a message:
  2702.   * +0: dword: PID of sender
  2703.   * +4: dword: message length (not including this header)
  2704.   * +8: n*byte: message data
  2705.  
  2706. ------------------ Subfunction 2 - send IPC message ------------------
  2707. Is called by process-sender.
  2708. Parameters:
  2709.   * eax = 60 - function number
  2710.   * ebx = 2 - subfunction number
  2711.   * ecx = PID of receiver
  2712.   * edx = pointer to the message data
  2713.   * esi = message length (in bytes)
  2714. Returned value:
  2715.   * eax = 0 - success
  2716.   * eax = 1 - the receiver has not defined buffer for IPC messages
  2717.     (can be, still have no time,
  2718.     and can be, this is not right process)
  2719.   * eax = 2 - the receiver has blocked IPC-buffer; try to wait a bit
  2720.   * eax = 3 - overflow of IPC-buffer of the receiver
  2721.   * eax = 4 - process/thread with such PID does not exist
  2722. Remarks:
  2723.   * Immediately after writing of IPC-message to the buffer the system
  2724.     sends to the receiver the event with code 7 (see event codes).
  2725.  
  2726. ======================================================================
  2727. ==== Function 61 - get parameters for the direct graphics access. ====
  2728. ======================================================================
  2729. The data of the graphics screen (the memory area which displays
  2730. screen contents) are accessible to a program directly, without
  2731. any system calls, through the selector gs:
  2732.         mov     eax, [gs:0]
  2733. places in eax the first dword of the buffer, which contains
  2734. information on color of the left upper point (and, possibly, colors
  2735. of several following).
  2736.         mov     [gs:0], eax
  2737. by work in VESA modes with LFB sets color of the left upper point
  2738. (and, possibly, colors of several following).
  2739. To interpret the data of graphics screen program needs to know
  2740. some parameters, returning by this function.
  2741. Remarks:
  2742.   * Graphics parameters changes very seldom at work,
  2743.     namely, only in cases, when user works with the application VRR.
  2744.   * At videomode change the system redraws all windows (event
  2745.     with code 1) and redraws the background (event 5).
  2746.     Same events occur in other cases too, which meet much more often,
  2747.     than videomode change.
  2748.   * By operation in videomodes with LFB the selector gs points to
  2749.     LFB itself, so reading/writing on gs result directly in
  2750.     change of screen contents. By operation in videomodes without
  2751.     LFB gs points to some data area in the kernel, and all functions
  2752.     of screen output fulfil honesty double operation on writing
  2753.     directly to the screen and writing to this buffer. In result
  2754.     at reading contents of this buffer the results correspond to
  2755.     screen contents (with, generally speaking, large color
  2756.     resolution), and writing is ignored.
  2757.     One exception is the mode 320*200, for which main loop of the
  2758.     system thread updates the screen according to mouse movements.
  2759.  
  2760. ------------------------- Screen resolution --------------------------
  2761. Parameters:
  2762.   * eax = 61 - function number
  2763.   * ebx = 1 - subfunction number
  2764. Returned value:
  2765.   * eax = [resolution on x axis]*65536 + [resolution on y axis]
  2766. Remarks:
  2767.   * One can use function 14 paying attention that
  2768.     it returns sizes on 1 pixel less. It is fully equivalent way.
  2769.  
  2770. ---------------------- Number of bits per pixel ----------------------
  2771. Parameters:
  2772.   * eax = 61 - function number
  2773.   * ebx = 2 - subfunction number
  2774. Returned value:
  2775.   * eax = number of bits per pixel (24 or 32)
  2776.  
  2777. -------------------- Number of bytes per scanline --------------------
  2778. Parameters:
  2779.   * eax = 61 - function number
  2780.   * ebx = 3 - subfunction number
  2781. Returned value:
  2782.   * eax = number of bytes occupied by one scanline
  2783.     (horizontal line on the screen)
  2784.  
  2785. ======================================================================
  2786. ===== Function 62, subfunction 0 - get version of PCI-interface. =====
  2787. ======================================================================
  2788. Parameters:
  2789.   * eax = 62 - function number
  2790.   * bl = 0 - subfunction number
  2791. Returned value:
  2792.   * eax = -1 - PCI access is disabled; otherwise
  2793.   * ah.al = version of PCI-interface (ah=version, al=subversion)
  2794.   * high word of eax is zeroed
  2795. Remarks:
  2796.   * Previously low-level access to PCI for applications must be
  2797.     enabled by subfunction 12 of function 21.
  2798.   * If PCI BIOS is not supported, the value of ax is undefined.
  2799.  
  2800. ======================================================================
  2801. ==== Function 62, subfunction 1 - get number of the last PCI-bus. ====
  2802. ======================================================================
  2803. Parameters:
  2804.   * eax = 62 - function number
  2805.   * bl = 1 - subfunction number
  2806. Returned value:
  2807.   * eax = -1 - access to PCI is disabled; otherwise
  2808.   * al = number of the last PCI-bus; other bytes of eax are destroyed
  2809. Remarks:
  2810.   * Previously low-level access to PCI for applications must be
  2811.     enabled by subfunction 12 of function 21.
  2812.   * If PCI BIOS is not supported, the value of ax is undefined.
  2813.  
  2814. ======================================================================
  2815. ===================== Function 62, subfunction 2 =====================
  2816. ===== Get mechanism of addressing to the PCI configuration space. ====
  2817. ======================================================================
  2818. Parameters:
  2819.   * eax = 62 - function number
  2820.   * bl = 2 - subfunction number
  2821. Returned value:
  2822.   * eax = -1 - access to PCI is disabled; otherwise
  2823.   * al = mechanism (1 or 2); other bytes of eax are destroyed
  2824. Remarks:
  2825.   * Previously low-level access to PCI for applications must be
  2826.     enabled by subfunction 12 of function 21.
  2827.   * Addressing mechanism is selected depending on
  2828.     equipment characteristics.
  2829.   * Subfunctions of read and write work automatically
  2830.     with the selected mechanism.
  2831.  
  2832. ======================================================================
  2833. ======== Function 62, subfunctions 4,5,6 - read PCI-register. ========
  2834. ======================================================================
  2835. Parameters:
  2836.   * eax = 62 - function number
  2837.   * bl = 4 - read byte
  2838.   * bl = 5 - read word
  2839.   * bl = 6 - read dword
  2840.   * bh = number of PCI-bus
  2841.   * ch = dddddfff, where ddddd = number of the device on the bus,
  2842.     fff = function number of device
  2843.   * cl = number of register (must be even for bl=5,
  2844.     divisible by 4 for bl=6)
  2845. Returned value:
  2846.   * eax = -1 - error (access to PCI is disabled or parameters
  2847.     are not supported); otherwise
  2848.   * al/ax/eax (depending on requested size) contains the data;
  2849.     the other part of register eax is destroyed
  2850. Remarks:
  2851.   * Previously low-level access to PCI for applications must be
  2852.     enabled by subfunction 12 of function 21.
  2853.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  2854.     function number. To get access mechanism use subfunction 2.
  2855.   * Some registers are standard and exist for all devices, some are
  2856.     defined by the concrete device. The list of registers of the
  2857.     first type can be found e.g. in famous
  2858.     Interrupt List by Ralf Brown
  2859.     (http://www.pobox.com/~ralf/files.html,
  2860.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/);
  2861.     registers of the second type must be listed
  2862.     in the device documentation.
  2863.  
  2864. ======================================================================
  2865. ====== Function 62, subfunctions 8,9,10 - write to PCI-register. =====
  2866. ======================================================================
  2867. Parameters:
  2868.   * eax = 62 - function number
  2869.   * bl = 8 - write byte
  2870.   * bl = 9 - write word
  2871.   * bl = 10 - write dword
  2872.   * bh = number of PCI-bus
  2873.   * ch = dddddfff, where ddddd = number of the device on the bus,
  2874.     fff = function number of device
  2875.   * cl = number of register (must be even for bl=9,
  2876.     divisible by 4 for bl=10)
  2877.   * dl/dx/edx (depending on requested size) contatins
  2878.     the data to write
  2879. Returned value:
  2880.   * eax = -1 - error (access to PCI is disabled or parameters
  2881.     are not supported)
  2882.   * eax = 0 - success
  2883. Remarks:
  2884.   * Previously low-level access to PCI for applications must be
  2885.     enabled by subfunction 12 of function 21.
  2886.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  2887.     function number. To get access mechanism use subfunction 2.
  2888.   * Some registers are standard and exist for all devices, some are
  2889.     defined by the concrete device. The list of registers of the
  2890.     first type can be found e.g. in famous Interrupt List by
  2891.     Ralf Brown; registers of the second type must be listed
  2892.     in the device documentation.
  2893.  
  2894. ======================================================================
  2895. ============== Function 63 - work with the debug board. ==============
  2896. ======================================================================
  2897. The debug board is the global system buffer (with the size
  2898. 1024 bytes), to which any program can write (generally speaking,
  2899. arbitrary) data and from which other program can read these data.
  2900. By the agreement written data are text strings interpreted as
  2901. debug messages on a course of program execution. The kernel in
  2902. some situations also writes to the debug board information on
  2903. execution of some functions; by the agreement kernel messages
  2904. begins from the prefix "K : ".
  2905. For view of the debug board the application 'board' was created,
  2906. which reads data from the buffer and displays them in its window.
  2907. 'board' interpretes the sequence of codes 13,10 as newline.
  2908. A character with null code in an end of line is not necessary,
  2909. but also does not prevent.
  2910. Because debugger has been written, the value of the debug board
  2911. has decreased, as debugger allows to inspect completely a course of
  2912. program execution without any efforts from the direction of program
  2913. itself. Nevertheless in some cases the debug board is still useful.
  2914.  
  2915. ----------------------------- Write byte -----------------------------
  2916. Parameters:
  2917.   * eax = 63 - function number
  2918.   * ebx = 1 - subfunction number
  2919.   * cl = data byte
  2920. Returned value:
  2921.   * function does not return value
  2922. Remarks:
  2923.   * Byte is written to the buffer. Buffer size is 512 bytes.
  2924.     At buffer overflow all obtained data are lost.
  2925.   * For output to the debug board of more complicated objects
  2926.     (strings, numbers) it is enough to call this function in cycle.
  2927.     It is possible not to write the appropriate code manually and use
  2928.     file 'debug.inc', which is included into the distributive.
  2929.  
  2930. ----------------------------- Read byte ------------------------------
  2931. Takes away byte from the buffer.
  2932. Parameters:
  2933.   * eax = 63 - function number
  2934.   * ebx = 2 - subfunction number
  2935. Returned value:
  2936.   * eax = ebx = 0 - the buffer is empty
  2937.   * eax = byte, ebx = 1 - byte was successfully read
  2938.  
  2939. ======================================================================
  2940. ============== Function 64 - resize application memory. ==============
  2941. ======================================================================
  2942. Parameters:
  2943.   * eax = 64 - function number
  2944.   * ebx = 1 - unique subfunction
  2945.   * ecx = new memory size
  2946. Returned value:
  2947.   * eax = 0 - success
  2948.   * eax = 1 - not enough memory
  2949. Remarks:
  2950.   * There is another way to dynamically allocate/free memory -
  2951.     subfunctions 11, 12, 13 of function 68.
  2952.   * The function cannot be used together with 68.11, 68.12, 68.13.
  2953.     The function call will be ignored after creation of process heap
  2954.     with function 68.11.
  2955.  
  2956. ======================================================================
  2957. ======== Function 65 - draw image with palette in the window. ========
  2958. ======================================================================
  2959. Parameters:
  2960.   * eax = 65 - function number
  2961.   * ebx = pointer to the image
  2962.   * ecx = [size on axis x]*65536 + [size on axis y]
  2963.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  2964.   * esi = number of bits per pixel, must be 1,2,4,8,9,15,16,24 or 32;
  2965.   * edi = pointer to palette (2 to the power esi colors 0x00RRGGBB);
  2966.           ignored when esi > 8
  2967.   * ebp = offset of next row data relative to previous row data
  2968. Returned value:
  2969.   * function does not return value
  2970. Remarks:
  2971.   * Coordinates of the image are coordinates of the upper left corner
  2972.     of the image relative to the window.
  2973.   * Format of image with 1 bit per pixel: each byte of image
  2974.     (possibly excluding last bytes in rows), contains information on
  2975.     the color of 8 pixels, MSB corresponds to first pixel.
  2976.   * Format of image with 2 bits per pixel: each byte of image
  2977.     (possibly excluding last bytes in rows), contains information on
  2978.     the color of 4 pixels, two MSBs correspond to first pixel.
  2979.   * Format of image with 4 bits per pixel: each byte of image
  2980.     excluding last bytes in rows (if width is odd) contains
  2981.     information on the color of 2 pixels, high-order tetrad
  2982.     corresponds to first pixel.
  2983.   * Format of image with 8 bits per pixel: each byte of image is
  2984.     index in the palette.
  2985.   * Format of image with 9 bits per pixel: array of one byte values;
  2986.     each byte (8 bit) represents the intensity of gray for one pixel;
  2987.     this format is equal to 8bpp without palette.
  2988.   * Format of image with 15 bits per pixel: the color of each pixel
  2989.     is coded as (bit representation) 0RRRRRGGGGGBBBBB - 5 bits per
  2990.     each color.
  2991.   * Format of image with 16 bits per pixel: the color of each pixel
  2992.     is coded as RRRRRGGGGGGBBBBB (5+6+5).
  2993.   * Format of image with 24 bits per pixel: the color of each pixel
  2994.     is coded as 3 bytes - sequentially blue, green, red components.
  2995.   * Format of image with 32 bits per pixel: similar to 24, but
  2996.     one additional ignored byte is present.
  2997.   * The call to function 7 is equivalent to call to this function
  2998.     with esi=24, ebp=0.
  2999.  
  3000. ======================================================================
  3001. ================== Function 66 - work with keyboard. =================
  3002. ======================================================================
  3003. The input mode influences results of reading keys by function 2.
  3004. When a program loads, ASCII input mode is set for it.
  3005.  
  3006. -------------- Subfunction 1 - set keyboard input mode. --------------
  3007. Parameters:
  3008.   * eax = 66 - function number
  3009.   * ebx = 1 - subfunction number
  3010.   * ecx = mode:
  3011.     * 0 = normal (ASCII-characters)
  3012.     * 1 = scancodes
  3013. Returned value:
  3014.   * function does not return value
  3015.  
  3016. -------------- Subfunction 2 - get keyboard input mode. --------------
  3017. Parameters:
  3018.   * eax = 66 - function number
  3019.   * ebx = 2 - subfunction number
  3020. Returned value:
  3021.   * eax = current mode
  3022.  
  3023. ------------ Subfunction 3 - get status of control keys. -------------
  3024. Parameters:
  3025.   * eax = 66 - function number
  3026.   * ebx = 3 - subfunction number
  3027. Returned value:
  3028.   * eax = bit mask:
  3029.   * bit 0  (mask 1): left Shift is pressed
  3030.   * bit 1  (mask 2): right Shift is pressed
  3031.   * bit 2  (mask 4): left Ctrl is pressed
  3032.   * bit 3  (mask 8): right Ctrl is pressed
  3033.   * bit 4  (mask 0x10): left Alt is pressed
  3034.   * bit 5  (mask 0x20): right Alt is pressed
  3035.   * bit 6  (mask 0x40): CapsLock is on
  3036.   * bit 7  (mask 0x80): NumLock is on
  3037.   * bit 8  (mask 0x100): ScrollLock is on
  3038.   * bit 9  (mask 0x200): left Win is pressed
  3039.   * bit 10 (mask 0x400): right Win is pressed
  3040.   * other bits are cleared
  3041.  
  3042. -------------- Subfunction 4 - set system-wide hotkey. ---------------
  3043. When hotkey is pressed, the system notifies only those applications,
  3044. which have installed it; the active application (which receives
  3045. all normal input) does not receive such keys.
  3046. The notification consists in sending event with the code 2.
  3047. Reading hotkey is the same as reading normal key - by function 2.
  3048. Parameters:
  3049.   * eax = 66 - function number
  3050.   * ebx = 4 - subfunction number
  3051.   * cl determines key scancode;
  3052.     use cl=0 to give combinations such as Ctrl+Shift
  3053.   * edx = 0xXYZ determines possible states of control keys:
  3054.     * Z (low 4 bits) determines state of LShift and RShift:
  3055.       * 0 = no key must be pressed;
  3056.       * 1 = exactly one key must be pressed;
  3057.       * 2 = both keys must be pressed;
  3058.       * 3 = must be pressed LShift, but not RShift;
  3059.       * 4 = must be pressed RShift, but not LShift
  3060.     * Y - similar for LCtrl and RCtrl;
  3061.     * X - similar for LAlt and RAlt
  3062. Returned value:
  3063.   * eax=0 - success
  3064.   * eax=1 - too mant hotkeys (maximum 256 are allowed)
  3065. Remarks:
  3066.   * Hotkey can work either at pressing or at release. Release
  3067.     scancode of a key is more on 128 than pressing scancode
  3068.     (i.e. high bit is set).
  3069.   * Several applications can set the same combination;
  3070.     all such applications will be informed on pressing
  3071.     such combination.
  3072.  
  3073. -------------- Subfunction 5 - delete installed hotkey. --------------
  3074. Parameters:
  3075.   * eax = 66 - function number
  3076.   * ebx = 5 - subfunction number
  3077.   * cl = scancode of key and edx = 0xXYZ the same as in subfunction 4
  3078. Returned value:
  3079.   * eax = 0 - success
  3080.   * eax = 1 - there is no such hotkey
  3081. Remarks:
  3082.   * When a process/thread terminates, all hotkey installed by it are
  3083.     deleted.
  3084.   * The call to this subfunction does not affect other applications.
  3085.     If other application has defined the same combination, it will
  3086.     still receive notices.
  3087.  
  3088. --------------- Subfunction 6 - block the normal input. --------------
  3089. Parameters:
  3090.   * eax = 66 - function number
  3091.   * ebx = 6 - subfunction number
  3092. Returned value:
  3093.   * function does not return value
  3094. Remarks:
  3095.   * Blocking the normal keyboard input for installed hotkeys
  3096.   * To emulate a mouse via the keyboard, the application MOUSEMUL
  3097.  
  3098. ------------ Subfunction 7 - unlock the normal input. ----------------
  3099. Parameters:
  3100.   * eax = 66 - function number
  3101.   * ebx = 7 - subfunction number
  3102. Returned value:
  3103.   * function does not return value
  3104. Remarks:
  3105.   * Unlocking the results of the f. 66.6
  3106.   * To emulate a mouse via the keyboard, the application MOUSEMUL
  3107.  
  3108. ======================================================================
  3109. ========= Function 67 - change position/sizes of the window. =========
  3110. ======================================================================
  3111. Parameters:
  3112.   * eax = 67 - function number
  3113.   * ebx = new x-coordinate of the window
  3114.   * ecx = new y-coordinate of the window
  3115.   * edx = new x-size of the window
  3116.   * esi = new y-size of the window
  3117. Returned value:
  3118.   * function does not return value
  3119. Remarks:
  3120.   * The value -1 for a parameter means "do not change"; e.g. to move
  3121.     the window without resizing it is possible to specify edx=esi=-1.
  3122.   * Previously the window must be defined by function 0.
  3123.     It sets initial coordinates and sizes of the window.
  3124.   * Sizes of the window are understood in sense of function 0,
  3125.     that is one pixel less than real sizes.
  3126.   * The function call for maximized windows is simply ignored.
  3127.   * For windows of appropriate styles position and/or sizes can be
  3128.     changed by user; current position and sizes can be obtained by
  3129.     call to function 9.
  3130.   * The function sends to the window redraw event (with the code 1).
  3131.  
  3132. ======================================================================
  3133. ====== Function 68, subfunction 0 - get the task switch counter. =====
  3134. ======================================================================
  3135. Parameters:
  3136.   * eax = 68 - function number
  3137.   * ebx = 0 - subfunction number
  3138. Returned value:
  3139.   * eax = number of task switches from the system booting
  3140.     (modulo 2^32)
  3141.  
  3142. ======================================================================
  3143. ======= Function 68, subfunction 1 - switch to the next thread. ======
  3144. ======================================================================
  3145. The function completes the current time slice allocated to the
  3146. thread and switches to the next. (Which thread in which process
  3147. will be next, is unpredictable). Later, when execution queue
  3148. will reach the current thread, execution will be continued.
  3149. Parameters:
  3150.   * eax = 68 - function number
  3151.   * ebx = 1 - subfunction number
  3152. Returned value:
  3153.   * function does not return value
  3154.  
  3155. ======================================================================
  3156. ============= Function 68, subfunction 2 - cache + rdpmc. ============
  3157. ======================================================================
  3158. Parameters:
  3159.   * eax = 68 - function number
  3160.   * ebx = 2 - subfunction number
  3161.   * ecx = required action:
  3162.     * ecx = 0 - enable instruction 'rdpmc'
  3163.       (ReaD Performance-Monitoring Counters) for applications
  3164.     * ecx = 1 - find out whether cache is disabled/enabled
  3165.     * ecx = 2 - enable cache
  3166.     * ecx = 3 - disable cache
  3167. Returned value:
  3168.   * for ecx=0:
  3169.     * eax = the value of cr4
  3170.   * for ecx=1:
  3171.     * eax = (cr0 and 0x60000000):
  3172.     * eax = 0 - cache is on
  3173.     * eax <> 0 - cache is off
  3174.   * for ecx=2 and ecx=3:
  3175.     * function does not return value
  3176.  
  3177. ======================================================================
  3178. =========== Function 68, subfunction 3 - read MSR-register. ==========
  3179. ======================================================================
  3180. MSR = Model Specific Register; the complete list of MSR-registers
  3181. of a processor is included to the documentation on it (for example,
  3182. IA-32 Intel Architecture Software Developer's Manual,
  3183. Volume 3, Appendix B); each processor family has its own subset
  3184. of the MSR-registers.
  3185. Parameters:
  3186.   * eax = 68 - function number
  3187.   * ebx = 3 - subfunction number
  3188.   * ecx is ignored
  3189.   * edx = MSR address
  3190. Returned value:
  3191.   * ebx:eax = high:low dword of the result
  3192. Remarks:
  3193.   * If ecx contains nonexistent or not implemented for this processor
  3194.     MSR, processor will generate an exception in the kernel, which
  3195.     will kill the thread.
  3196.   * Previously it is necessary to check, whether MSRs are supported
  3197.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3198.     will generate other exception in the kernel, which will anyway
  3199.     kill the thread.
  3200.  
  3201. ======================================================================
  3202. ========= Function 68, subfunction 4 - write to MSR-register. ========
  3203. ======================================================================
  3204. MSR = Model Specific Register; the complete list of MSR-registers
  3205. of a processor is included to the documentation on it (for example,
  3206. IA-32 Intel Architecture Software Developer's Manual,
  3207. Volume 3, Appendix B); each processor family has its own subset
  3208. of the MSR-registers.
  3209. Parameters:
  3210.   * eax = 68 - function number
  3211.   * ebx = 4 - subfunction number
  3212.   * ecx is ignored
  3213.   * edx = MSR address
  3214.   * esi:edi = high:low dword
  3215. Returned value:
  3216.   * function does not return value
  3217. Remarks:
  3218.   * If ecx contains nonexistent or not implemented for this processor
  3219.     MSR, processor will generate an exception in the kernel, which
  3220.     will kill the thread.
  3221.   * Previously it is necessary to check, whether MSRs are supported
  3222.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3223.     will generate other exception in the kernel, which will anyway
  3224.     kill the thread.
  3225.  
  3226. ======================================================================
  3227. ======= Function 68, subfunction 11 - initialize process heap. =======
  3228. ======================================================================
  3229. Parameters:
  3230.   * eax = 68 - function number
  3231.   * ebx = 11 - subfunction number
  3232. Returned value:
  3233.   * eax = 0 - failed
  3234.   * otherwise size of created heap
  3235. Remarks:
  3236.   * The function call initializes heap, from which one can in future
  3237.     allocate and free memory blocks with subfunctions 12 and 13.
  3238.     Heap size is equal to total amount of free application memory.
  3239.   * The second function call from the same process results in
  3240.     returning the size of the existing heap.
  3241.   * After creation of the heap calls to function 64 will be ignored.
  3242.  
  3243. ======================================================================
  3244. ======== Function 68, subfunction 12 - allocate memory block. ========
  3245. ======================================================================
  3246. Parameters:
  3247.   * eax = 68 - function number
  3248.   * ebx = 12 - subfunction number
  3249.   * ecx = required size in bytes
  3250. Returned value:
  3251.   * eax = pointer to the allocated block
  3252. Remarks:
  3253.   * Before this call one must initialize process heap by call to
  3254.     subfunction 11.
  3255.   * The function allocates an integer number of pages (4 Kb) in such
  3256.     way that the real size of allocated block is more than or equal to
  3257.     requested size.
  3258.  
  3259. ======================================================================
  3260. ========== Function 68, subfunction 13 - free memory block. ==========
  3261. ======================================================================
  3262. Parameters:
  3263.   * eax = 68 - function number
  3264.   * ebx = 13 - subfunction number
  3265.   * ecx = pointer to the memory block
  3266. Returned value:
  3267.   * eax = 1 - success
  3268.   * eax = 0 - failed
  3269. Remarks:
  3270.   * The memory block must have been allocated by subfunction 12
  3271.     or subfunction 20.
  3272.  
  3273. ======================================================================
  3274. ===================== Function 68, subfunction 14 ====================
  3275. ============ Wait for signal from another program/driver. ============
  3276. ======================================================================
  3277. Parameters:
  3278.   * eax = 68 - function number
  3279.   * ebx = 14 - subfunction number
  3280.   * ecx = pointer to the buffer for information (24 bytes)
  3281. Returned value:
  3282.   * buffer pointed to by ecx contains the following information:
  3283.     * +0: dword: identifier for following data of signal
  3284.     * +4: dword: data of signal (20 bytes), format of which is defined
  3285.           by the first dword
  3286.  
  3287. ======================================================================
  3288. ============= Function 68, subfunction 16 - load driver. =============
  3289. ======================================================================
  3290. Parameters:
  3291.   * eax = 68 - function number
  3292.   * ebx = 16 - subfunction number
  3293.   * ecx = pointer to ASCIIZ-string with driver name
  3294. Returned value:
  3295.   * eax = 0 - failed
  3296.   * otherwise eax = driver handle
  3297. Remarks:
  3298.   * If the driver was not loaded yet, it is loaded;
  3299.     if the driver was loaded yet, nothing happens.
  3300.   * Driver name is case-sensitive.
  3301.     Maximum length of the name is 16 characters, including
  3302.     terminating null character, the rest is ignored.
  3303.   * Driver ABC is loaded from file /rd/1/drivers/ABC.obj.
  3304.  
  3305. ======================================================================
  3306. ============ Function 68, subfunction 17 - driver control. ===========
  3307. ======================================================================
  3308. Parameters:
  3309.   * eax = 68 - function number
  3310.   * ebx = 17 - subfunction number
  3311.   * ecx = pointer to the control structure:
  3312.     * +0: dword: handle of driver
  3313.     * +4: dword: code of driver function
  3314.     * +8: dword: pointer to input data
  3315.     * +12 = +0xC: dword: size of input data
  3316.     * +16 = +0x10: dword: pointer to output data
  3317.     * +20 = +0x14: dword: size of output data
  3318. Returned value:
  3319.   * eax = determined by driver
  3320. Remarks:
  3321.   * Function codes and the structure of input/output data
  3322.     are defined by driver.
  3323.   * Previously one must obtain driver handle by subfunction 16.
  3324.  
  3325. ======================================================================
  3326. =============== Function 68, subfunction 19 - load DLL. ==============
  3327. ======================================================================
  3328. Parameters:
  3329.   * eax = 68 - function number
  3330.   * ebx = 19 - subfunction number
  3331.   * ecx = pointer to ASCIIZ-string with the full path to DLL
  3332. Returned value:
  3333.   * eax = 0 - failed
  3334.   * otherwise eax = pointer to DLL export table
  3335. Remarks:
  3336.   * Export table is an array of structures of 2 dword's, terminated
  3337.     by zero. The first dword in structure points to function name,
  3338.     the second dword contains address of function.
  3339.  
  3340. ======================================================================
  3341. ======= Function 68, subfunction 20 - reallocate memory block. =======
  3342. ======================================================================
  3343. Parameters:
  3344.   * eax = 68 - function number
  3345.   * ebx = 20 - subfunction number
  3346.   * ecx = new size in bytes
  3347.   * edx = pointer to already allocated block
  3348. Returned value:
  3349.   * eax = pointer to the reallocated block, 0 = error
  3350. Remarks:
  3351.   * Before this call one must initialize process heap by call to
  3352.     subfunction 11.
  3353.   * The function allocates an integer number of pages (4 Kb) in such
  3354.     way that the real size of allocated block is more than or equal to
  3355.     requested size.
  3356.   * If edx=0, the function call is equivalent to memory allocation
  3357.     with subfunction 12. Otherwise the block at edx
  3358.     must be allocated earlier with subfunction 12 or this subfunction.
  3359.   * If ecx=0, the function frees memory block at edx and returns 0.
  3360.   * The contents of the block are unchanged up to the shorter of
  3361.     the new and old sizes.
  3362.  
  3363. ======================================================================
  3364. =========== Function 68, subfunction 21 - load driver PE. ============
  3365. ======================================================================
  3366. Parameters:
  3367.   * eax = 68 - function number
  3368.   * ebx = 21 - subfunction number
  3369.   * ecx = pointer to ASCIIZ-string with driver name
  3370.   * edx = pointer to command line
  3371. Returned value:
  3372.   * eax = 0 - failed
  3373.   * otherwise eax = driver handle
  3374. Remarks:
  3375.   * If the driver was not loaded yet, it is loaded;
  3376.     if the driver was loaded yet, nothing happens.
  3377.  
  3378. ======================================================================
  3379. ======== Function 68, subfunction 22 - open named memory area. =======
  3380. ======================================================================
  3381. Parameters:
  3382.   * eax = 68 - function number
  3383.   * ebx = 22 - subfunction number
  3384.   * ecx = area name. Maximum of 31 characters with terminating zero
  3385.   * edx = area size in bytes for SHM_CREATE and SHM_OPEN_ALWAYS
  3386.   * esi = flags for open and access:
  3387.     * SHM_OPEN        = 0x00 - open existing memory area. If an area
  3388.                           with such name does not exist, the function
  3389.                           will return error code 5.
  3390.     * SHM_OPEN_ALWAYS = 0x04 - open existing or create new
  3391.                           memory area.
  3392.     * SHM_CREATE      = 0x08 - create new memory area. If an area
  3393.                           with such name already exists, the function
  3394.                           will return error code 10.
  3395.     * SHM_READ        = 0x00 - only read access
  3396.     * SHM_WRITE       = 0x01 - read and write access
  3397. Returned value:
  3398.   * eax = pointer to memory area, 0 if error has occured
  3399.   * if new area is created (SHM_CREATE or SHM_OPEN_ALWAYS):
  3400.     edx = 0 - success, otherwise - error code
  3401.   * if existing area is opened (SHM_OPEN or SHM_OPEN_ALWAYS):
  3402.     edx = error code (if eax=0) or area size in bytes
  3403. Error codes:
  3404.   * E_NOTFOUND = 5
  3405.   * E_ACCESS = 10
  3406.   * E_NOMEM = 30
  3407.   * E_PARAM = 33
  3408. Remarks:
  3409.   * Before this call one must initialize process heap by call to
  3410.     subfunction 11.
  3411.   * If a new area is created, access flags set maximal rights
  3412.     for other processes. An attempt from other process to open
  3413.     with denied rights will fail with error code E_ACCESS.
  3414.   * The process which has created an area always has write access.
  3415.  
  3416. ======================================================================
  3417. ======= Function 68, subfunction 23 - close named memory area. =======
  3418. ======================================================================
  3419. Parameters:
  3420.   * eax = 68 - function number
  3421.   * ebx = 23 - subfunction number
  3422.   * ecx = area name. Maximum of 31 characters with terminating zero
  3423. Returned value:
  3424.   * eax destroyed
  3425. Remarks:
  3426.   * A memory area is physically freed (with deleting all data and
  3427.     freeing physical memory), when all threads which have opened
  3428.     this area will close it.
  3429.   * When thread is terminating, all opened by it areas are closed.
  3430.  
  3431. ======================================================================
  3432. ======== Function 68, subfunction 24 - set exception handler. ========
  3433. ======================================================================
  3434. Parameters:
  3435.   * eax = 68 - function number
  3436.   * ebx = 24 - subfunction number
  3437.   * ecx = address of the new exception handler
  3438.   * edx = the mask of handled exceptions
  3439. Returned value:
  3440.   * eax = address of the old exception handler (0, if it was not set)
  3441.   * ebx = the old mask of handled exceptions
  3442. Remarks:
  3443.   * Bit number in mask of exceptions corresponds to exception number
  3444.     in CPU-specification (Intel-PC). For example, FPU exceptions have
  3445.     number 16 (#MF), and SSE exceptions - 19 (#XF).
  3446.   * The current implementation ignores the inquiry for hook of 7
  3447.     exception - the system handles #NM by its own.
  3448.   * The exception handler is called with exception number as first
  3449.     (and only) stack parameter. So, correct exit from the handler is
  3450.     RET 4. It returns to the instruction, that caused the exception,
  3451.     for faults, and to the next instruction for traps (see
  3452.     classification of exceptions in CPU specification).
  3453.   * When user handler receives control, the corresponding bit in
  3454.     the exception mask is cleared. Raising this exception
  3455.     in consequence leads to default handling, that is,
  3456.     terminating the application in absence of debugger or
  3457.     suspend with notification of debugger otherwise.
  3458.   * After user handler completes critical operations, it can set
  3459.     the corresponding bit in the exception mask with subfunction 25.
  3460.     Also user handler is responsible for clearing exceptions flags in
  3461.     FPU and/or SSE.
  3462.  
  3463. ======================================================================
  3464. ====== Function 68, subfunction 25 - set FPU exception handler. ======
  3465. ======================================================================
  3466. Parameters:
  3467.   * eax = 68 - function number
  3468.   * ebx = 25 - subfunction number
  3469.   * ecx = signal number
  3470.   * edx = value of activity (0/1)
  3471. Returned value:
  3472.   * eax = -1 - invalid signal number
  3473.   * otherwise eax = old value of activity for this signal (0/1)
  3474. Remarks:
  3475.   * In current implementation only mask for user excepton handler,
  3476.     which has been previously set by subfunction 24,
  3477.     is changed. Signal number corresponds to exception number.
  3478.  
  3479. ======================================================================
  3480. ====== Function 68, subfunction 26 - release memory pages ============
  3481. ======================================================================
  3482. Parameters:
  3483.   * eax = 68 - function number
  3484.   * ebx = 26 - subfunction number
  3485.   * ecx = pointer to the memory block, allocated by subfunction 12
  3486.   * edx = offset from the block beginnings
  3487.   * esi = the size of the region of memory to release, in bytes
  3488. Remarks:
  3489.   * function release range of pages from ecx+edx to ecx+edx+esi
  3490.     and set virtual memory into reserved state.
  3491.  
  3492. ======================================================================
  3493. ========== Function 68, subfunction 27 - load file ===================
  3494. ======================================================================
  3495. Parameters:
  3496.   * eax = 68 - function number
  3497.   * ebx = 27 - subfunction number
  3498.   * ecx = pointer to ASCIIZ-string with the filename
  3499. Returned value:
  3500.   * eax = pointer to the loaded file, or zero
  3501.   * edx = size of the loaded file, or zero
  3502. Remarks:
  3503.   * function loads file and unpacks, if necessary
  3504.  
  3505. ======================================================================
  3506. ====================== Function 69 - debugging. ======================
  3507. ======================================================================
  3508. A process can load other process as debugged by set of corresponding
  3509. bit by call to subfunction 7 of function 70.
  3510. A process can have only one debugger; one process can debug some
  3511. others. The system notifies debugger on events occuring with
  3512. debugged process. Messages are written to the buffer defined by
  3513. subfunction 0.
  3514. Format of a message:
  3515.   * +0: dword: message code
  3516.   * +4: dword: PID of debugged process
  3517.   * +8: there can be additional data depending on message code
  3518. Message codes:
  3519.   * 1 = exception
  3520.     * in addition dword-number of the exception is given
  3521.     * process is suspended
  3522.   * 2 = process has terminated
  3523.     * comes at any termination: both through the system function -1,
  3524.       and at "murder" by any other process (including debugger itself)
  3525.   * 3 = debug exception int 1 = #DB
  3526.     * in addition dword-image of the register DR6 is given:
  3527.       * bits 0-3: condition of the corresponding breakpoint (set by
  3528.         subfunction 9) is satisfied
  3529.       * bit 14: exception has occured because of the trace mode
  3530.         (flag TF is set TF)
  3531.     * process is suspended
  3532. When debugger terminates, all debugged processes are killed.
  3533. If debugger does not want this, it must previously detach by
  3534. subfunction 3.
  3535.  
  3536. All subfunctions are applicable only to processes/threads started
  3537. from the current by function 70 with set debugging flag.
  3538. Debugging of multithreaded programs is not supported yet.
  3539. The full list of subfunctions:
  3540.   * subfunction 0 - define data area for debug messages
  3541.   * subfunction 1 - get contents of registers of debugged thread
  3542.   * subfunction 2 - set contents of registers of debugged thread
  3543.   * subfunction 3 - detach from debugged process
  3544.   * subfunction 4 - suspend debugged thread
  3545.   * subfunction 5 - resume debugged thread
  3546.   * subfunction 6 - read from the memory of debugged process
  3547.   * subfunction 7 - write to the memory of debugged process
  3548.   * subfunction 8 - terminate debugged thread
  3549.   * subfunction 9 - set/clear hardware breakpoint
  3550.  
  3551. ======================================================================
  3552. = Function 69, subfunction 0 - define data area fror debug messages. =
  3553. ======================================================================
  3554. Parameters:
  3555.   * eax = 69 - function number
  3556.   * ebx = 0 - subfunction number
  3557.   * ecx = pointer
  3558. Format of data area:
  3559.   * +0: dword: N = buffer size (not including this header)
  3560.   * +4: dword: occupied place
  3561.   * +8: N*byte: buffer
  3562. Returned value:
  3563.   * function does not return value
  3564. Remarks:
  3565.   * If the size field is negative, the buffer is considered locked
  3566.     and at arrival of new message the system will wait.
  3567.     For synchronization frame all work with the buffer by operations
  3568.     lock/unlock
  3569.         neg     [bufsize]
  3570.   * Data in the buffer are considered as array of items with variable
  3571.     length - messages. Format of a message is explained in
  3572.     general description.
  3573.  
  3574. ======================================================================
  3575. ===================== Function 69, subfunction 1 =====================
  3576. ============ Get contents of registers of debugged thread. ===========
  3577. ======================================================================
  3578. Parameters:
  3579.   * eax = 69 - function number
  3580.   * ebx = 1 - subfunction number
  3581.   * ecx = thread identifier
  3582.   * edx = size of context structure, must be 0x28=40 bytes
  3583.   * esi = pointer to context structure
  3584. Returned value:
  3585.   * function does not return value
  3586. Format of context structure: (FPU is not supported yet)
  3587.   * +0: dword: eip
  3588.   * +4: dword: eflags
  3589.   * +8: dword: eax
  3590.   * +12 = +0xC: dword: ecx
  3591.   * +16 = +0x10: dword: edx
  3592.   * +20 = +0x14: dword: ebx
  3593.   * +24 = +0x18: dword: esp
  3594.   * +28 = +0x1C: dword: ebp
  3595.   * +32 = +0x20: dword: esi
  3596.   * +36 = +0x24: dword: edi
  3597. Remarks:
  3598.   * If the thread executes code of ring-0, the function returns
  3599.     contents of registers of ring-3.
  3600.   * Process must be loaded for debugging (as is shown in
  3601.     general description).
  3602.  
  3603. ======================================================================
  3604. ===================== Function 69, subfunction 2 =====================
  3605. ============ Set contents of registers of debugged thread. ===========
  3606. ======================================================================
  3607. Parameters:
  3608.   * eax = 69 - function number
  3609.   * ebx = 2 - subfunction number
  3610.   * ecx = thread identifier
  3611.   * edx = size of context structure, must be 0x28=40 bytes
  3612. Returned value:
  3613.   * function does not return value
  3614. Format of context structure is shown in the description of
  3615. subfunction 1.
  3616. Remarks:
  3617.   * If the thread executes code of ring-0, the function returns
  3618.     contents of registers of ring-3.
  3619.   * Process must be loaded for debugging (as is shown in
  3620.     general description).
  3621.  
  3622. ======================================================================
  3623. ===== Function 69, subfunction 3 - detach from debugged process. =====
  3624. ======================================================================
  3625. Parameters:
  3626.   * eax = 69 - function number
  3627.   * ebx = 3 - subfunction number
  3628.   * ecx = identifier
  3629. Returned value:
  3630.   * function does not return value
  3631. Remarks:
  3632.   * If the process was suspended, it resumes execution.
  3633.  
  3634. ======================================================================
  3635. ======== Function 69, subfunction 4 - suspend debugged thread. =======
  3636. ======================================================================
  3637. Parameters:
  3638.   * eax = 69 - function number
  3639.   * ebx = 4 - subfunction number
  3640.   * ecx = thread identifier
  3641. Returned value:
  3642.   * function does not return value
  3643. Remarks:
  3644.   * Process must be loaded for debugging (as is shown in
  3645.     general description).
  3646.  
  3647. ======================================================================
  3648. ======== Function 69, subfunction 5 - resume debugged thread. ========
  3649. ======================================================================
  3650. Parameters:
  3651.   * eax = 69 - function number
  3652.   * ebx = 5 - subfunction number
  3653.   * ecx = thread identifier
  3654. Returned value:
  3655.   * function does not return value
  3656. Remarks:
  3657.   * Process must be loaded for debugging (as is shown in
  3658.     general description).
  3659.  
  3660. ======================================================================
  3661. = Fucntion 69, subfunction 6 - read from memory of debugged process. =
  3662. ======================================================================
  3663. Parameters:
  3664.   * eax = 69 - function number
  3665.   * ebx = 6 - subfunction number
  3666.   * ecx = identifier
  3667.   * edx = number of bytes to read
  3668.   * esi = address in the memory of debugged process
  3669.   * edi = pointer to buffer for data
  3670. Returned value:
  3671.   * eax = -1 at an error (invalid PID or buffer)
  3672.   * otherwise eax = number of read bytes (possibly, 0,
  3673.     if esi is too large)
  3674. Remarks:
  3675.   * Process must be loaded for debugging (as is shown in
  3676.     general description).
  3677.  
  3678. ======================================================================
  3679. == Function 69, subfunction 7 - write to memory of debugged process. =
  3680. ======================================================================
  3681. Parameters:
  3682.   * eax = 69 - function number
  3683.   * ebx = 7 - subfunction number
  3684.   * ecx = identifier
  3685.   * edx = number of bytes to write
  3686.   * esi = address of memory in debugged process
  3687.   * edi = pointer to data
  3688. Returned value:
  3689.   * eax = -1 at an error (invalid PID or buffer)
  3690.   * otherwise eax = number of written bytes (possibly, 0,
  3691.     if esi is too large)
  3692. Remarks:
  3693.   * Process must be loaded for debugging (as is shown in
  3694.     general description).
  3695.  
  3696. ======================================================================
  3697. ======= Function 69, subfunction 8 - terminate debugged thread. ======
  3698. ======================================================================
  3699. Parameters:
  3700.   * eax = 69 - function number
  3701.   * ebx = 8 - subfunction number
  3702.   * ecx = identifier
  3703. Returned value:
  3704.   * function does not return value
  3705. Remarks:
  3706.   * Process must be loaded for debugging (as is shown in
  3707.     general description).
  3708.   * The function is similar to subfunction 2 of function 18
  3709.     with two differences: it requires first remark and
  3710.     accepts PID rather than slot number.
  3711.  
  3712. ======================================================================
  3713. ===== Function 69, subfunction 9 - set/clear hardware breakpoint. ====
  3714. ======================================================================
  3715. Parameters:
  3716.   * eax = 69 - function number
  3717.   * ebx = 9 - subfunction number
  3718.   * ecx = thread identifier
  3719.   * dl = index of breakpoint, from 0 to 3 inclusively
  3720.   * dh = flags:
  3721.     * if high bit is cleared - set breakpoint:
  3722.       * bits 0-1 - condition:
  3723.         * 00 = breakpoint on execution
  3724.         * 01 = breakpoint on read
  3725.         * 11 = breakpoint on read/write
  3726.       * bits 2-3 - length; for breakpoints on exception it must be
  3727.         00, otherwise one of
  3728.         * 00 = byte
  3729.         * 01 = word
  3730.         * 11 = dword
  3731.       * esi = breakpoint address; must be aligned according to
  3732.         the length (i.e. must be even for word breakpoints,
  3733.         divisible by 4 for dword)
  3734.     * if high bit is set - clear breakpoint
  3735. Returned value:
  3736.   * eax = 0 - success
  3737.   * eax = 1 - error in the input data
  3738.   * eax = 2 - (reserved, is never returned in the current
  3739.     implementation) a global breakpoint with that index is already set
  3740. Remarks:
  3741.   * Process must be loaded for debugging (as is shown in
  3742.     general description).
  3743.   * Hardware breakpoints are implemented through DRx-registers of
  3744.     the processor, all limitations results from this.
  3745.   * The function can reinstall the breakpoint, previously set
  3746.     by it (and it does not inform on this).
  3747.     Carry on the list of set breakpoints in the debugger.
  3748.   * Breakpoints generate debug exception #DB, on which the system
  3749.     notifies debugger.
  3750.   * Breakpoints on write and read/write act after
  3751.     execution of the caused it instruction.
  3752.  
  3753. ======================================================================
  3754. ==== Function 70 - work with file system with long names support. ====
  3755. ======================================================================
  3756. Parameters:
  3757.   * eax = 70
  3758.   * ebx = pointer to the information structure
  3759. Returned value:
  3760.   * eax = 0 - success; otherwise file system error code
  3761.   * some subfunctions return value in other registers too
  3762. General format of the information structure:
  3763.   * +0: dword: subfunction number
  3764.   * +4: dword: file offset
  3765.   * +8: dword: high dword of offset (must be 0) or flags field
  3766.   * +12 = +0xC: dword: size
  3767.   * +16 = +0x10: dword: pointer to data
  3768.   * +20 = +0x14: n db: ASCIIZ-string with the filename
  3769.     or
  3770.   * +20 = +0x14: db 0
  3771.   * +21 = +0x15: dd pointer to ASCIIZ-string with the filename
  3772. Specifications - in documentation on the appropriate subfunction.
  3773. Filename is case-insensitive. Russian letters must be written in
  3774. the encoding cp866 (DOS).
  3775. Format of filename:
  3776. /base/number/dir1/dir2/.../dirn/file,
  3777. where /base/number identifies device, on which file is located:
  3778. one of
  3779.   * /RD/1 = /RAMDISK/1 to access ramdisk
  3780.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  3781.     /FD/2 = /FLOPPYDISK/2 to access second one
  3782.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  3783.     IDE0 (Primary Master), IDE1 (Primary Slave),
  3784.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  3785.     x - partition number on the selected hard drive, varies from 1
  3786.     to 255 (on each hard drive the indexing starts from 1)
  3787.   * /CD0/1, /CD1/1, /CD2/1, /CD3/1 to access accordingly to
  3788.     CD on IDE0 (Primary Master), IDE1 (Primary Slave),
  3789.     IDE2 (Secondary Master), IDE3 (Secondary Slave)
  3790.   * /SYS means system folder; with the usual boot (from floppy)
  3791.     is equivalent to /RD/1
  3792. Examples:
  3793.   * '/rd/1/kernel.asm',0
  3794.   * '/HD0/1/kernel.asm',0
  3795.   * '/hd0/2/menuet/pics/tanzania.bmp',0
  3796.   * '/hd0/1/Program files/NameOfProgram/SomeFile.SomeExtension',0
  3797.   * '/sys/MySuperApp.ini',0
  3798. Also function supports relative names.  If the path begins not
  3799. with '/', it is considered relative to a current folder. To get or
  3800. set a current folder, use the function 30.
  3801.  
  3802. Available subfunctions:
  3803.   * subfunction 0 - read file
  3804.   * subfunction 1 - read folder
  3805.   * subfunction 2 - create/rewrite file
  3806.   * subfunction 3 - write to existing file
  3807.   * subfunction 4 - set file size
  3808.   * subfunction 5 - get attributes of file/folder
  3809.   * subfunction 6 - set attributes of file/folder
  3810.   * subfunction 7 - start application
  3811.   * subfunction 8 - delete file/folder
  3812.   * subfunction 9 - create folder
  3813. For CD-drives due to hardware limitations only subfunctions
  3814. 0,1,5 and 7 are available, other subfunctions return error
  3815. with code 2.
  3816. At the first call of subfunctions 0,1,5,7 to ATAPI devices
  3817. (CD and DVD) the manual control of tray is locked due to caching
  3818. drive data. Unlocking is made when subfunction 4 of function 24
  3819. is called for corresponding device.
  3820.  
  3821. ======================================================================
  3822. === Function 70, subfunction 0 - read file with long names support. ==
  3823. ======================================================================
  3824. Parameters:
  3825.   * eax = 70 - function number
  3826.   * ebx = pointer to the information structure
  3827. Format of the information structure:
  3828.   * +0: dword: 0 = subfunction number
  3829.   * +4: dword: file offset (in bytes)
  3830.   * +8: dword: 0 (reserved for high dword of offset)
  3831.   * +12 = +0xC: dword: number of bytes to read
  3832.   * +16 = +0x10: dword: pointer to buffer for data
  3833.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  3834.     given in the general description
  3835.     or
  3836.   * +20 = +0x14: db 0
  3837.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  3838. Returned value:
  3839.   * eax = 0 - success, otherwise file system error code
  3840.   * ebx = number of read bytes or -1=0xffffffff if file was not found
  3841. Remarks:
  3842.   * If file was ended before last requested block was read,
  3843.     the function will read as many as it can, and after that return
  3844.     eax=6 (EOF).
  3845.   * The function does not allow to read folder (returns eax=10,
  3846.     access denied).
  3847.  
  3848. ======================================================================
  3849. == Function 70, subfunction 1 - read folder with long names support. =
  3850. ======================================================================
  3851. Parameters:
  3852.   * eax = 70 - function number
  3853.   * ebx = pointer to the information structure
  3854. Format of the information structure:
  3855.   * +0: dword: 1 = subfunction number
  3856.   * +4: dword: index of starting block (beginning from 0)
  3857.   * +8: dword: flags field:
  3858.     * bit 0 (mask 1): in what format to return names,
  3859.       0=ANSI, 1=UNICODE
  3860.     * other bits are reserved and must be set to 0 for the future
  3861.       compatibility
  3862.   * +12 = +0xC: dword: number of blocks to read
  3863.   * +16 = +0x10: dword: pointer to buffer for data, buffer size
  3864.     must be not less than 32 + [+12]*560 bytes
  3865.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  3866.     given in the general description
  3867.     or
  3868.   * +20 = +0x14: db 0
  3869.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  3870. Returned value:
  3871.   * eax = 0 - success, otherwise file system error code
  3872.   * ebx = number of files, information on which was written to
  3873.     the buffer, or -1=0xffffffff, if folder was not found
  3874. Structure of the buffer:
  3875.   * +0: 32*byte: header
  3876.   * +32 = +0x20: n1*byte: block with information on file 1
  3877.   * +32+n1: n2*byte: block with information on file 2
  3878.   * ...
  3879. Structure of header:
  3880.   * +0: dword: version of structure (current is 1)
  3881.   * +4: dword: number of placed blocks; is not greater than requested
  3882.     in the field +12 of information structure; can be less, if
  3883.     there are no more files in folder (the same as in ebx)
  3884.   * +8: dword: total number of files in folder
  3885.   * +12 = +0xC: 20*byte: reserved (zeroed)
  3886. Structure of block of data for folder entry (BDFE):
  3887.   * +0: dword: attributes of file:
  3888.     * bit 0 (mask 1): file is read-only
  3889.     * bit 1 (mask 2): file is hidden
  3890.     * bit 2 (mask 4): file is system
  3891.     * bit 3 (mask 8): this is not a file but volume label
  3892.       (for one partition meets no more than once and
  3893.       only in root folder)
  3894.     * bit 4 (mask 0x10): this is a folder
  3895.     * bit 5 (mask 0x20): file was not archived - many archivation
  3896.       programs have an option to archive only files with this bit set,
  3897.       and after archiving this bit is cleared - it can be useful
  3898.       for automatically creating of backup-archives as at writing
  3899.       this bit is usually set
  3900.   * +4: byte: type of name data:
  3901.     (coincides with bit 0 of flags in the information structure)
  3902.     * 0 = ASCII = 1-byte representation of each character
  3903.     * 1 = UNICODE = 2-byte representation of each character
  3904.   * +5: 3*byte: reserved (zero)
  3905.   * +8: 4*byte: time of file creation
  3906.   * +12 = +0xC: 4*byte: date of file creation
  3907.   * +16 = +0x10: 4*byte: time of last access (read or write)
  3908.   * +20 = +0x14: 4*byte: date of last access
  3909.   * +24 = +0x18: 4*byte: time of last modification
  3910.   * +28 = +0x1C: 4*byte: date of last modification
  3911.   * +32 = +0x20: qword: file size in bytes (up to 16777216 Tb)
  3912.   * +40 = +0x28: name
  3913.     * for ASCII format: maximum length is 263 characters
  3914.       (263 bytes), byte after the name has value 0
  3915.     * for UNICODE format: maximum length is 259 characters
  3916.       (518 bytes), 2 bytes after the name have value 0
  3917. Time format:
  3918.   * +0: byte: seconds
  3919.   * +1: byte: minutes
  3920.   * +2: byte: hours
  3921.   * +3: byte: reserved (0)
  3922.   * for example, 23.59.59 is written as (in hex) 3B 3B 17 00
  3923. Date format:
  3924.   * +0: byte: day
  3925.   * +1: byte: month
  3926.   * +2: word: year
  3927.   * for example, 25.11.1979 is written as (in hex) 19 0B BB 07
  3928. Remarks:
  3929.   * If BDFE contains ASCII name, the length of BDFE is 304 bytes,
  3930.     if UNICODE name - 560 bytes. Value of length is aligned
  3931.     on 16-byte bound (to accelerate processing in CPU cache).
  3932.   * First character after a name is zero (ASCIIZ-string). The further
  3933.     data contain garbage.
  3934.   * If files in folder were ended before requested number was read,
  3935.     the function will read as many as it can, and after that return
  3936.     eax=6 (EOF).
  3937.   * Any folder on the disk, except for root, contains two special
  3938.     entries "." and "..", identifying accordingly the folder itself
  3939.     and the parent folder.
  3940.   * The function allows also to read virtual folders "/", "/rd",
  3941.     "/fd", "/hd[n]", thus attributes of subfolders are set to 0x10,
  3942.     and times and dates are zeroed. An alternative way to get the
  3943.     equipment information - subfunction 11 of function 18.
  3944.  
  3945. ======================================================================
  3946. ===================== Function 70, subfunction 2 =====================
  3947. ============ Create/rewrite file with long names support. ============
  3948. ======================================================================
  3949. Parameters:
  3950.   * eax = 70 - function number
  3951.   * ebx = pointer to the information structure
  3952. Format of the information structure:
  3953.   * +0: dword: 2 = subfunction number
  3954.   * +4: dword: 0 (reserved)
  3955.   * +8: dword: 0 (reserved)
  3956.   * +12 = +0xC: dword: number of bytes to read
  3957.   * +16 = +0x10: dword: pointer to data
  3958.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  3959.     given in the general description
  3960.     or
  3961.   * +20 = +0x14: db 0
  3962.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  3963. Returned value:
  3964.   * eax = 0 - success, otherwise file system error code
  3965.   * ebx = number of written bytes (possibly 0)
  3966. Remarks:
  3967.   * If a file with given name did not exist, it is created;
  3968.     if it existed, it is rewritten.
  3969.   * If there is not enough free space on disk, the function will
  3970.     write as many as can and then return error code 8.
  3971.   * The function is not supported for CD (returns error code 2).
  3972.  
  3973. ======================================================================
  3974. ===================== Function 70, subfunction 3 =====================
  3975. =========== Write to existing file with long names support. ==========
  3976. ======================================================================
  3977. Parameters:
  3978.   * eax = 70 - function number
  3979.   * ebx = pointer to the information structure
  3980. Format of the information structure:
  3981.   * +0: dword: 3 = subfunction number
  3982.   * +4: dword: file offset (in bytes)
  3983.   * +8: dword: high dword of offset (must be 0 for FAT)
  3984.   * +12 = +0xC: dword: number of bytes to write
  3985.   * +16 = +0x10: dword: pointer to data
  3986.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  3987.     given in the general description
  3988.     or
  3989.   * +20 = +0x14: db 0
  3990.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  3991. Returned value:
  3992.   * eax = 0 - success, otherwise file system error code
  3993.   * ebx = number of written bytes (possibly 0)
  3994. Remarks:
  3995.   * The file must already exist, otherwise function returns eax=5.
  3996.   * The only result of write 0 bytes is update in the file attributes
  3997.     date/time of modification and access to the current date/time.
  3998.   * If beginning and/or ending position is greater than file size
  3999.     (except for the previous case), the file is expanded to needed
  4000.     size with zero characters.
  4001.   * The function is not supported for CD (returns error code 2).
  4002.  
  4003. ======================================================================
  4004. ============ Function 70, subfunction 4 - set end of file. ===========
  4005. ======================================================================
  4006. Parameters:
  4007.   * eax = 70 - function number
  4008.   * ebx = pointer to the information structure
  4009. Format of the information structure:
  4010.   * +0: dword: 4 = subfunction number
  4011.   * +4: dword: low dword of new file size
  4012.   * +8: dword: high dword of new file size (must be 0 for FAT)
  4013.   * +12 = +0xC: dword: 0 (reserved)
  4014.   * +16 = +0x10: dword: 0 (reserved)
  4015.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4016.     given in the general description
  4017.     or
  4018.   * +20 = +0x14: db 0
  4019.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4020. Returned value:
  4021.   * eax = 0 - success, otherwise file system error code
  4022.   * ebx destroyed
  4023. Remarks:
  4024.   * If the new file size is less than old one, file is truncated.
  4025.     If the new size is greater than old one, file is expanded with
  4026.     characters with code 0. If the new size is equal to old one,
  4027.     the only result of call is set date/time of modification and
  4028.     access to the current date/time.
  4029.   * If there is not enough free space on disk for expansion, the
  4030.     function will expand to maximum possible size and then return
  4031.     error code 8.
  4032.   * The function is not supported for CD (returns error code 2).
  4033.  
  4034. ======================================================================
  4035. ==== Function 70, subfunction 5 - get information on file/folder. ====
  4036. ======================================================================
  4037. Parameters:
  4038.   * eax = 70 - function number
  4039.   * ebx = pointer to the information structure
  4040. Format of the information structure:
  4041.   * +0: dword: 5 = subfunction number
  4042.   * +4: dword: 0 (reserved)
  4043.   * +8: dword: 0 (reserved)
  4044.   * +12 = +0xC: dword: 0 (reserved)
  4045.   * +16 = +0x10: dword: pointer to buffer for data (40 bytes)
  4046.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4047.     given in the general description
  4048.     or
  4049.   * +20 = +0x14: db 0
  4050.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4051. Returned value:
  4052.   * eax = 0 - success, otherwise file system error code
  4053.   * ebx destroyed
  4054. Information on file is returned in the BDFE format (block of data
  4055. for folder entry), explained in the description of
  4056. subfunction 1, but without filename
  4057. (i.e. only first 40 = 0x28 bytes).
  4058. Remarks:
  4059.   * The function does not support virtual folders such as /, /rd and
  4060.     root folders like /rd/1.
  4061.  
  4062. ======================================================================
  4063. ===== Function 70, subfunction 6 - set attributes of file/folder. ====
  4064. ======================================================================
  4065. Parameters:
  4066.   * eax = 70 - function number
  4067.   * ebx = pointer to the information structure
  4068. Format of the information structure:
  4069.   * +0: dword: 6 = subfunction number
  4070.   * +4: dword: 0 (reserved)
  4071.   * +8: dword: 0 (reserved)
  4072.   * +12 = +0xC: dword: 0 (reserved)
  4073.   * +16 = +0x10: dword: pointer to buffer with attributes (32 bytes)
  4074.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4075.     given in the general description
  4076.     or
  4077.   * +20 = +0x14: db 0
  4078.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4079. Returned value:
  4080.   * eax = 0 - success, otherwise file system error code
  4081.   * ebx destroyed
  4082. File attributes are first 32 bytes in BDFE (block of data
  4083. for folder entry), explained in the description of subfunction 1
  4084. (that is, without name and size of file). Attribute
  4085. file/folder/volume label (bits 3,4 in dword +0) is not changed.
  4086. Byte +4 (name format) is ignored.
  4087. Remarks:
  4088.   * The function does not support virtual folders such as /, /rd and
  4089.     root folders like /rd/1.
  4090.   * The function is not supported for CD (returns error code 2).
  4091.  
  4092. ======================================================================
  4093. =========== Function 70, subfunction 7 - start application. ==========
  4094. ======================================================================
  4095. Parameters:
  4096.   * eax = 70 - function number
  4097.   * ebx = pointer to the information structure
  4098. Format of the information structure:
  4099.   * +0: dword: 7 = subfunction number
  4100.   * +4: dword: flags field:
  4101.     * bit 0: start process as debugged
  4102.     * other bits are reserved and must be set to 0
  4103.   * +8: dword: 0 or pointer to ASCIIZ-string with parameters
  4104.   * +12 = +0xC: dword: 0 (reserved)
  4105.   * +16 = +0x10: dword: 0 (reserved)
  4106.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4107.     given in the general description
  4108.     or
  4109.   * +20 = +0x14: db 0
  4110.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4111. Returned value:
  4112.   * eax > 0 - program is loaded, eax contains PID
  4113.   * eax < 0 - an error has occured, -eax contains
  4114.     file system error code
  4115.   * ebx destroyed
  4116. Remarks:
  4117.   * Command line must be terminated by the character with the code 0
  4118.     (ASCIIZ-string); function takes into account either all characters
  4119.     up to terminating zero inclusively or first 256 character
  4120.     regarding what is less.
  4121.   * If the process is started as debugged, it is created in
  4122.     the suspended state; to run use subfunction 5 of function 69.
  4123.  
  4124. ======================================================================
  4125. ========== Function 70, subfunction 8 - delete file/folder. ==========
  4126. ======================================================================
  4127. Parameters:
  4128.   * eax = 70 - function number
  4129.   * ebx = pointer to the information structure
  4130. Format of the information structure:
  4131.   * +0: dword: 8 = subfunction number
  4132.   * +4: dword: 0 (reserved)
  4133.   * +8: dword: 0 (reserved)
  4134.   * +12 = +0xC: dword: 0 (reserved)
  4135.   * +16 = +0x10: dword: 0 (reserved)
  4136.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4137.     given in the general description
  4138.     or
  4139.   * +20 = +0x14: db 0
  4140.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4141. Returned value:
  4142.   * eax = 0 - success, otherwise file system error code
  4143.   * ebx destroyed
  4144. Remarks:
  4145.   * The function is not supported for CD (returns error code 2).
  4146.   * The function can delete only empty folders (attempt to delete
  4147.     nonempty folder results in error with code 10, "access denied").
  4148.  
  4149. ======================================================================
  4150. ============= Function 70, subfunction 9 - create folder. ============
  4151. ======================================================================
  4152. Parameters:
  4153.   * eax = 70 - function number
  4154.   * ebx = pointer to the information structure
  4155. Format of the information structure:
  4156.   * +0: dword: 9 = subfunction number
  4157.   * +4: dword: 0 (reserved)
  4158.   * +8: dword: 0 (reserved)
  4159.   * +12 = +0xC: dword: 0 (reserved)
  4160.   * +16 = +0x10: dword: 0 (reserved)
  4161.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  4162.     given in the general description
  4163.     or
  4164.   * +20 = +0x14: db 0
  4165.   * +21 = +0x15: dd pointer to ASCIIZ-string with folder name
  4166. Returned value:
  4167.   * eax = 0 - success, otherwise file system error code
  4168.   * ebx destroyed
  4169. Remarks:
  4170.   * The function is not supported for CD (returns error code 2).
  4171.   * The parent folder must already exist.
  4172.   * If target folder already exists, function returns success (eax=0).
  4173.  
  4174. ======================================================================
  4175. ========== Function 71, subfunction 1 - set window caption. ==========
  4176. ======================================================================
  4177. Parameters:
  4178.   * eax = 71 - function number
  4179.   * ebx = 1 - subfunction number
  4180.   * ecx = pointer to caption string
  4181. Returned value:
  4182.   * function does not return value
  4183. Remarks:
  4184.   * String must be in the ASCIIZ-format. Disregarding real string
  4185.     length, no more than 255 characters are drawn.
  4186.   * Pass NULL in ecx to remove caption.
  4187.  
  4188. ======================================================================
  4189. =============== Function 72 - send message to a window. ==============
  4190. ======================================================================
  4191.  
  4192. - Subfunction 1 - send message with parameter to the active window. --
  4193. Parameters:
  4194.   * eax = 72 - function number
  4195.   * ebx = 1 - subfunction number
  4196.   * ecx = event code: 2 or 3
  4197.   * edx = parameter: key code for ecx=2, button identifier for ecx=3
  4198. Returned value:
  4199.   * eax = 0 - success
  4200.   * eax = 1 - buffer is full
  4201.  
  4202. ======================================================================
  4203. ===================== Function 73 - blit bitmap  =====================
  4204. ======================================================================
  4205.  
  4206. Parameters:
  4207.   * eax = 73 - function number
  4208.  
  4209.   * ebx = ROP and optional flags
  4210.      31           6 5  4 3   0
  4211.      [  reserved  ][T][B][ROP]
  4212.      ROP - raster operation code
  4213.         0: Copy
  4214.      1-15: reserved
  4215.      B   - blit into the background surface
  4216.      T   - transparent blit
  4217.  
  4218.   * ecx = pointer to the function parameters
  4219.         destination offset and clipping
  4220.      +0 signed dword: destination rectangle X offset from the window
  4221.                       top-left corner
  4222.      +4 signed dword: destination rectangle Y offset from the window
  4223.                       top-left corner
  4224.      +8 dword:        destination rectangle width
  4225.     +12 dword:        destination rectangle height
  4226.  
  4227.         source offset and clipping
  4228.     +16 signed dword: source rectangle X offset from the bitmap
  4229.                       top-left corner
  4230.     +20 signed dword: source rectangle Y offset from the bitmap
  4231.                       top-left corner
  4232.     +24 dword:        source rectangle width
  4233.     +28 dword:        source rectangle height
  4234.  
  4235.     +32: dword: bitmap data - must be 32bpp
  4236.     +36: dword: size of the bitmap row in bytes
  4237.  
  4238. Returned value:
  4239.   * function does not return value
  4240.  
  4241. ======================================================================
  4242. = Function 74, Subfunction -1, Get number of active network devices. =
  4243. ======================================================================
  4244. Parameters:
  4245.   * eax = 74 - function number
  4246.   * bl = -1 - subfunction number
  4247. Returned value:
  4248.   * eax = number of active network devices
  4249.  
  4250. ======================================================================
  4251. ======== Function 74, Subfunction 0, Get network device type. ========
  4252. ======================================================================
  4253. Parameters:
  4254.   * eax = 74 - function number
  4255.   * bl = 0 - subfunction number
  4256.   * bh = device number
  4257. Returned value:
  4258.   * eax = device type
  4259.  
  4260. ======================================================================
  4261. ======== Function 74, Subfunction 1, Get network device name. ========
  4262. ======================================================================
  4263. Parameters:
  4264.   * eax = 74 - function number
  4265.   * bl = 1 - subfunction number
  4266.   * bh = device number
  4267.   * ecx = pointer to 64 byte buffer
  4268. Returned value:
  4269.   * eax = -1 on error
  4270.   * The network device name is written into the buffer, on success
  4271.  
  4272. ======================================================================
  4273. ========= Function 74, Subfunction 2, Reset network device. ==========
  4274. ======================================================================
  4275. Parameters:
  4276.   * eax = 74 - function number
  4277.   * bl = 2 - subfunction number
  4278.   * bh = device number
  4279. Returned value:
  4280.   * eax = -1 on error
  4281.  
  4282. ======================================================================
  4283. ========== Function 74, Subfunction 3, Stop network device. ==========
  4284. ======================================================================
  4285. Parameters:
  4286.   * eax = 74 - function number
  4287.   * bl = 3 - subfunction number
  4288.   * bh = device number
  4289. Returned value:
  4290.   * eax = -1 on error
  4291.  
  4292. ======================================================================
  4293. ============== Function 75, Subfunction 0, Open socket. ==============
  4294. ======================================================================
  4295. Parameters:
  4296.   * eax = 75 - function number
  4297.   * bl = 0 - subfunction number
  4298.   * ecx = domain
  4299.   * edx = type
  4300.   * esi = protocol
  4301. Returned value:
  4302.   * eax = socket number, -1 on error
  4303.   * ebx = errorcode
  4304.  
  4305. ======================================================================
  4306. ============= Function 75, Subfunction 1, Close socket. ==============
  4307. ======================================================================
  4308. Parameters:
  4309.   * eax = 75 - function number
  4310.   * bl = 1 - subfunction number
  4311.   * ecx = socket number
  4312. Returned value:
  4313.   * eax = -1 on error
  4314.   * ebx = errorcode
  4315.  
  4316. ======================================================================
  4317. ================== Function 75, Subfunction 2, Bind. =================
  4318. ======================================================================
  4319. Parameters:
  4320.   * eax = 75 - function number
  4321.   * bl = 2 - subfunction number
  4322.   * ecx = socket number
  4323.   * edx = pointer to sockaddr structure
  4324.   * esi = length of sockaddr structure
  4325. Returned value:
  4326.   * eax = -1 on error
  4327.   * ebx = errorcode
  4328.  
  4329. ======================================================================
  4330. ================= Function 75, Subfunction 3, Listen. ================
  4331. ======================================================================
  4332. Parameters:
  4333.   * eax = 75 - function number
  4334.   * bl = 3 - subfunction number
  4335.   * ecx = socket number
  4336.   * edx = backlog
  4337. Returned value:
  4338.   * eax = -1 on error
  4339.   * ebx = errorcode
  4340.  
  4341. ======================================================================
  4342. ================ Function 75, Subfunction 4, Connect. ================
  4343. ======================================================================
  4344. Parameters:
  4345.   * eax = 75 - function number
  4346.   * bl = 4 - subfunction number
  4347.   * ecx = socket number
  4348.   * edx = pointer to sockaddr structure
  4349.   * esi = length of sockaddr structure
  4350. Returned value:
  4351.   * eax = -1 on error
  4352.   * ebx = errorcode
  4353.  
  4354. ======================================================================
  4355. ================= Function 75, Subfunction 5, Accept. ================
  4356. ======================================================================
  4357. Parameters:
  4358.   * eax = 75 - function number
  4359.   * bl = 5 - subfunction number
  4360.   * ecx = socket number
  4361.   * edx = pointer to sockaddr structure
  4362.   * esi = length of sockaddr structure
  4363. Returned value:
  4364.   * eax = socket number of accepted socket, -1 on error
  4365.   * ebx = errorcode
  4366.  
  4367. ======================================================================
  4368. ================== Function 75, Subfunction 6, Send. =================
  4369. ======================================================================
  4370. Parameters:
  4371.   * eax = 75 - function number
  4372.   * bl = 6 - subfunction number
  4373.   * ecx = socket number
  4374.   * edx = pointer to buffer
  4375.   * esi = length of buffer
  4376.   * edi = flags