Subversion Repositories Kolibri OS

Rev

Rev 2106 | Rev 2434 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. SYSTEM FUNCTIONS of OS Kolibri 0.7.7.0
  2.  
  3. Number of the function is located in the register eax.
  4. The call of the system function is executed by "int 0x40" command.
  5. All registers except explicitly declared in the returned value,
  6.     including eflags, are preserved.
  7.  
  8.  
  9. ======================================================================
  10. ============== Function 0 - define and draw the window. ==============
  11. ======================================================================
  12. Defines an application window. Draws a frame of the window, header and
  13. working area. For skinned windows defines standard close and minimize
  14. buttons.
  15. Parameters:
  16.   * eax = 0 - function number
  17.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  18.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  19.   * edx = 0xXYRRGGBB, where:
  20.     * Y = style of the window:
  21.       * Y=0 - type I - fixed-size window
  22.       * Y=1 - only define window area, draw nothing
  23.       * Y=2 - type II - variable-size window
  24.       * Y=3 - skinned window
  25.       * Y=4 - skinned fixed-size window
  26.       * other possible values (from 5 up to 15) are reserved,
  27.         function call with such Y is ignored
  28.     * RR, GG, BB = accordingly red, green, blue components of a color
  29.       of the working area of the window (are ignored for style Y=2)
  30.     * X = DCBA (bits)
  31.       * A = 1 - window has caption; for styles Y=3,4 caption string
  32.                   must be passed in edi, for other styles use
  33.                   subfunction 1 of function 71
  34.       * B = 1 - coordinates of all graphics primitives are relative to
  35.                   window client area
  36.       * C = 1 - don't fill working area on window draw
  37.       * D = 0 - normal filling of the working area, 1 - gradient
  38.     The following parameters are intended for windows
  39.     of a type I and II, and ignored for styles Y=1,3:
  40.   * esi = 0xXYRRGGBB - color of the header
  41.     * RR, GG, BB define color
  42.     * Y=0 - usual window, Y=1 - unmovable window
  43.     * X defines a gradient of header: X=0 - no gradient,
  44.       X=8 - usual gradient,
  45.       for windows of a type II X=4 - negative gradient
  46.     * other values of X and Y are reserved
  47.   * edi = 0x00RRGGBB - color of the frame
  48. Returned value:
  49.   * function does not return value
  50. Remarks:
  51.   * Position and sizes of the window are installed by the first
  52.     call of this function and are ignored at subsequent; to change
  53.     position and/or sizes of already created window use function 67.
  54.   * For windows with styles Y=3,4 and caption (A=1) caption string
  55.     is set by the first call of this function and is ignored
  56.     at subsequent (strictly speaking, is ignored after a call to
  57.     subfunction 2 of function 12 - end redraw); to change caption of
  58.     already created window use subfunction 1 of function 71.
  59.   * If the window has appropriate styles, position and/or sizes can be
  60.     changed by user. Current position and sizes can be obtained
  61.     by function 9.
  62.   * The window must fit on the screen. If the transferred
  63.     coordinates and sizes do not satisfy to this condition,
  64.     appropriate coordinate (or, probably, both) is considered as zero,
  65.     and if it does not help too, the appropriate size
  66.     (or, probably, both) is installed in a size of the screen.
  67.    
  68.     Further let us designate xpos,ypos,xsize,ysize - values passed
  69.     in ebx,ecx. The coordinates are resulted concerning
  70.     the left upper corner of the window, which, thus, is set as (0,0),
  71.     coordinates of the right lower corner essence (xsize,ysize).
  72.   * The sizes of the window are understood in sence of coordinates
  73.     of the right lower corner. This concerns all other functions too.
  74.     It means, that the real sizes are on 1 pixel more.
  75.   * The window of type I looks as follows:
  76.     * draw external frame of color indicated in edi, 1 pixel in width
  77.     * draw header - rectangle with the left upper corner (1,1) and
  78.       right lower (xsize-1,min(25,ysize)) color indicated in esi
  79.       (taking a gradient into account)
  80.     * if ysize>=26, fill the working area of the window -
  81.       rectangle with the left upper corner (1,21) and right lower
  82.       (xsize-1,ysize-1) (sizes (xsize-1)*(ysize-21)) with color
  83.       indicated in edx (taking a gradient into account)
  84.     * if A=1 and caption has been already set by subfunction 1
  85.       of function 71, it is drawn in the corresponding place of header
  86.   * The window of style Y=1 looks as follows:
  87.     * completely defined by the application
  88.   * The window of type II looks as follows:
  89.     * draw external frame of width 1 pixel with the "shaded" color
  90.       edi (all components of the color decrease twice)
  91.     * draw intermediate frame of width 3 pixels with color edi
  92.     * draw internal frame of width 1 pixel with the "shaded" color edi
  93.     * draw header - rectangle with the left upper corner (4,4)
  94.       and right lower (xsize-4,min(20,ysize)) color, indicated in esi
  95.       (taking a gradient into account)
  96.     * if ysize>=26, fill the working area of the window -
  97.       rectangle with the left upper corner (5,20) and right lower
  98.       (xsize-5,ysize-5) with color indicated in edx
  99.       (taking a gradient into account)
  100.     * if A=1 and caption has been already set by subfunction 1
  101.       of function 71, it is drawn in the corresponding place of header
  102.   * The skinned window looks as follows:
  103.     * draw external frame of width 1 pixel
  104.       with color 'outer' from the skin
  105.     * draw intermediate frame of width 3 pixel
  106.       with color 'frame' from the skin
  107.     * draw internal frame of width 1 pixel
  108.       with color 'inner' from the skin
  109.     * draw header (on bitmaps from the skin) in a rectangle
  110.       (0,0) - (xsize,_skinh-1)
  111.     * if ysize>=26, fill the working area of the window -
  112.       rectangle with the left upper corner (5,_skinh) and right lower
  113.       (xsize-5,ysize-5) with color indicated in edx
  114.       (taking a gradient into account)
  115.     * define two standard buttons: close and minimize
  116.       (see function 8)
  117.     * if A=1 and edi contains (nonzero) pointer to caption string,
  118.       it is drawn in place in header defined in the skin
  119.     * value _skinh is accessible as the result of call
  120.       subfunction 4 of function 48
  121.  
  122. ======================================================================
  123. ================ Function 1 - put pixel in the window. ===============
  124. ======================================================================
  125. Parameters:
  126.   * eax = 1 - function number
  127.   * ebx = x-coordinate (relative to the window)
  128.   * ecx = y-coordinate (relative to the window)
  129.   * edx = 0x00RRGGBB - color of a pixel
  130.     edx = 0x01xxxxxx - invert color of a pixel
  131.           (low 24 bits are ignored)
  132. Returned value:
  133.   * function does not return value
  134.  
  135. ======================================================================
  136. ============ Function 2 - get the code of the pressed key. ===========
  137. ======================================================================
  138. Takes away the code of the pressed key from the buffer.
  139. Parameters:
  140.   * eax = 2 - function number
  141. Returned value:
  142.   * if the buffer is empty, function returns eax=1
  143.   * if the buffer is not empty, function returns al=0,
  144.     ah=code of the pressed key, high word of eax is zero
  145.   * if there is "hotkey", function returns al=2,
  146.     ah=scancode of the pressed key (0 for control keys),
  147.     high word of eax contains a status of control keys at the moment
  148.     of pressing a hotkey
  149. Remarks:
  150.   * There is a common system buffer of the pressed keys
  151.     by a size of 120 bytes, organized as queue.
  152.   * There is one more common system buffer on 120 "hotkeys".
  153.   * If the application with the inactive window calls this function,
  154.     the buffer of the pressed keys is considered to be empty.
  155.   * By default this function returns ASCII-codes; to switch
  156.     to the scancodes mode (and back) use function 66.
  157.     However, hotkeys are always notificated as scancodes.
  158.   * To find out, what keys correspond to what codes, start
  159.     the application keyascii and scancode.
  160.   * Scancodes come directly from keyboard and are fixed;
  161.     ASCII-codes turn out with usage of the conversion tables,
  162.     which can be set by subfunction 2 of function 21
  163.     and get by subfunction 2 of function 26.
  164.   * As a consequence, ASCII-codes take into account current
  165.     keyboard layout (rus/en) as opposed to scancodes.
  166.   * This function notifies only about those hotkeys, which were
  167.     defined by this thread by subfunction 4 of function 66.
  168.  
  169. ======================================================================
  170. ==================== Function 3 - get system time. ===================
  171. ======================================================================
  172. Parameters:
  173.   * eax = 3 - function number
  174. Returned value:
  175.   * eax = 0x00SSMMHH, where HH:MM:SS = Hours:Minutes:Seconds
  176.   * each item is BCD-number, for example,
  177.     for time 23:59:59 function returns 0x00595923
  178. Remarks:
  179.   * See also subfunction 9 of function 26 - get time from
  180.     the moment of start of the system; it is more convenient, because
  181.     returns simply DWORD-value of the time counter.
  182.   * System time can be set by function 22.
  183.  
  184. ======================================================================
  185. ============ Function 4 - draw text string in the window. ============
  186. ======================================================================
  187. Parameters:
  188.   * eax = 4 - function number
  189.   * ebx = [coordinate on axis x]*65536 + [coordinate on axis y]
  190.   * ecx = 0xX0RRGGBB, where
  191.     * RR, GG, BB specify text color
  192.     * X=ABnn (bits):
  193.     * nn specifies the used font: 0=system monospaced,
  194.       1=system font of variable width
  195.     * A=0 - output esi characters, A=1 - output ASCIIZ-string
  196.     * B=1 - fill background with the color edi
  197.   * edx = pointer to the beginning of the string
  198.   * esi = for A=0 length of the string, must not exceed 255;
  199.           for A=1 is ignored
  200. Returned value:
  201.   * function does not return value
  202. Remarks:
  203.   * First system font is read out at loading from the file char.mt,
  204.     second - from char2.mt.
  205.   * Both fonts have height 9 pixels, width of the monospaced font
  206.     is equal to 6 pixels.
  207.  
  208. ======================================================================
  209. ========================= Function 5 - delay. ========================
  210. ======================================================================
  211. Delays execution of the program on the given time.
  212. Parameters:
  213.   * eax = 5 - function number
  214.   * ebx = time in the 1/100 of second
  215. Returned value:
  216.   * function does not return value
  217. Remarks:
  218.   * Passing ebx=0 does not transfer control to the next process
  219.     and does not make any operations at all. If it is really required
  220.     to transfer control to the next process (to complete a current
  221.     time slice), use subfunction 1 of function 68.
  222.  
  223. ======================================================================
  224. ============== Function 6 - read the file from ramdisk. ==============
  225. ======================================================================
  226. Parameters:
  227.   * eax = 6 - function number
  228.   * ebx = pointer to the filename
  229.   * ecx = number of start block, beginning from 1;
  230.     ecx=0 - read from the beginning of the file (same as ecx=1)
  231.   * edx = number of blocks to read;
  232.     edx=0 - read one block (same as edx=1)
  233.   * esi = pointer to memory area for the data
  234. Returned value:
  235.   * eax = file size in bytes, if the file was successfully read
  236.   * eax = -1, if the file was not found
  237. Remarks:
  238.   * This function is out-of-date; function 70 allows
  239.     to fulfil the same operations with the extended possibilities.
  240.   * Block = 512 bytes.
  241.   * For reading all file you can specify the certainly large value
  242.     in edx, for example, edx = -1; but in this case be ready that
  243.     the program will "fall", if the file will appear too large and can
  244.     not be placed in the program memory.
  245.   * The filename must be either in the format 8+3 characters
  246.     (first 8 characters - name itself, last 3 - extension,
  247.     the short names and extensions are supplemented with spaces),
  248.     or in the format 8.3 characters "FILE.EXT"/"FILE.EX "
  249.     (name no more than 8 characters, dot, extension 3 characters
  250.     supplemented if necessary by spaces).
  251.     The filename must be written with capital letters. The terminating
  252.     character with code 0 is not necessary (not ASCIIZ-string).
  253.   * This function does not support folders on the ramdisk.
  254.  
  255. ======================================================================
  256. =============== Function 7 - draw image in the window. ===============
  257. ======================================================================
  258. Paramters:
  259.   * eax = 7 - function number
  260.   * ebx = pointer to the image in the format BBGGRRBBGGRR...
  261.   * ecx = [size on axis x]*65536 + [size on axis y]
  262.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  263. Returned value:
  264.   * function does not return value
  265. Remarks:
  266.   * Coordinates of the image are coordinates of the upper left corner
  267.     of the image relative to the window.
  268.   * Size of the image in bytes is 3*xsize*ysize.
  269.  
  270. ======================================================================
  271. =============== Function 8 - define/delete the button. ===============
  272. ======================================================================
  273. Parameters for button definition:
  274.   * eax = 8 - function number
  275.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  276.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  277.   * edx = 0xXYnnnnnn, where:
  278.     * nnnnnn = identifier of the button
  279.     * high (31st) bit of edx is cleared
  280.     * if 30th bit of edx is set - do not draw the button
  281.     * if 29th bit of edx is set - do not draw a frame
  282.       at pressing the button
  283.   * esi = 0x00RRGGBB - color of the button
  284. Parameters for button deleting:
  285.   * eax = 8 - function number
  286.   * edx = 0x80nnnnnn, where nnnnnn - identifier of the button
  287. Returned value:
  288.   * function does not return value
  289. Remarks:
  290.   * Sizes of the button must be more than 0 and less than 0x8000.
  291.   * For skinned windows definition of the window
  292.     (call of 0th function) creates two standard buttons -
  293.     for close of the window with identifier 1 and
  294.     for minimize of the window with identifier 0xffff.
  295.   * The creation of two buttons with same identifiers is admitted.
  296.   * The button with the identifier 0xffff at pressing is interpreted
  297.     by the system as the button of minimization, the system handles
  298.     such pressing independently, not accessing to the application.
  299.     In rest it is usual button.
  300.   * Total number of buttons for all applications is limited to 4095.
  301.  
  302. ======================================================================
  303. ============ Function 9 - information on execution thread. ===========
  304. ======================================================================
  305. Parameters:
  306.   * eax = 9 - function number
  307.   * ebx = pointer to 1-Kb buffer
  308.   * ecx = number of the slot of the thread
  309.     ecx = -1 - get information on the current thread
  310. Returned value:
  311.   * eax = maximum number of the slot of a thread
  312.   * buffer pointed to by ebx contains the following information:
  313.     * +0: dword: usage of the processor (how many time units
  314.       per second leaves on execution of this thread)
  315.     * +4: word: position of the window of thread in the window stack
  316.     * +6: word: (has no relation to the specified thread)
  317.       number of the thread slot, which window has in the window stack
  318.       position ecx
  319.     * +8: word: reserved
  320.     * +10 = +0xA: 11 bytes: name of the process
  321.       (name of corresponding executable file in the format 8+3)
  322.     * +21 = +0x15: byte: reserved, this byte is not changed
  323.     * +22 = +0x16: dword: address of the process in memory
  324.     * +26 = +0x1A: dword: size of used memory - 1
  325.     * +30 = +0x1E: dword: identifier (PID/TID)
  326.     * +34 = +0x22: dword: coordinate of the thread window on axis x
  327.     * +38 = +0x26: dword: coordinate of the thread window on axis y
  328.     * +42 = +0x2A: dword: size of the thread window on axis x
  329.     * +46 = +0x2E: dword: size of the thread window on axis y
  330.     * +50 = +0x32: word: status of the thread slot:
  331.       * 0 = thread is running
  332.       * 1 = thread is suspended
  333.       * 2 = thread is suspended while waiting for event
  334.       * 3 = thread is terminating as a result of call to function -1
  335.         or under duress as a result of call to subfunction 2
  336.         of function 18 or termination of the system
  337.       * 4 = thread is terminating as a result of exception
  338.       * 5 = thread waits for event
  339.       * 9 = requested slot is free, all other information on the slot
  340.         is not meaningful
  341.     * +52 = +0x34: word: reserved, this word is not changed
  342.     * +54 = +0x36: dword: coordinate of the client area on axis x
  343.     * +58 = +0x3A: dword: coordinate of the client area on axis y
  344.     * +62 = +0x3E: dword: width of the client area
  345.     * +66 = +0x42: dword: height of the client area
  346.     * +70 = +0x46: byte: state of the window - bitfield
  347.       * bit 0 (mask 1): window is maximized
  348.       * bit 1 (mask 2): window is minimized to panel
  349.       * bit 2 (mask 4): window is rolled up
  350.     * +71 = +0x47: dword: event mask
  351. Remarks:
  352.   * Slots are numbered starting from 1.
  353.   * Returned value is not a total number of threads, because there
  354.     can be free slots.
  355.   * When process is starting, system automatically creates
  356.     execution thread.
  357.   * Function gives information on the thread. Each process has
  358.     at least one thread. One process can create many threads,
  359.     in this case each thread has its own slot and the fields
  360.     +10, +22, +26 in these slots coincide.
  361.     Applications have no common way to define whether two threads
  362.     belong to one process.
  363.   * The active window - window on top of the window stack -
  364.     receives the messages on a keyboard input. For such window
  365.     the position in the window stack coincides with returned value.
  366.   * Slot 1 corresponds to special system thread, for which:
  367.     * the window is in the bottom of the window stack, the fields
  368.       +4 and +6 contain value 1
  369.     * name of the process - "OS/IDLE" (supplemented by spaces)
  370.     * address of the process in memory is 0, size of used memory is
  371.       16 Mb (0x1000000)
  372.     * PID=1
  373.     * coordinates and sizes of the window and the client area are by
  374.       convention set to 0
  375.     * status of the slot is always 0 (running)
  376.     * the execution time adds of time leaving on operations itself
  377.       and idle time in waiting for interrupt (which can be got by call
  378.       to subfunction 4 of function 18).
  379.   * Beginning from slot 2, the normal applications are placed.
  380.   * The normal applications are placed in memory at the address
  381.     0 (kernel constant 'std_application_base_address').
  382.     There is no intersection, as each process has its own page table.
  383.   * At creation of the thread it is assigned the slot
  384.     in the system table and identifier (Process/Thread IDentifier =
  385.     PID/TID), which do not vary with time for given thread.
  386.     After completion of the thread its slot can be anew used
  387.     for another thread. The thread identifier can not be assigned
  388.     to other thread even after completion of this thread.
  389.     Identifiers, assigned to new threads, grow monotonously.
  390.   * If the thread has not yet defined the window by call to
  391.     function 0, the position and the sizes
  392.     of its window are considered to be zero.
  393.   * Coordinates of the client area are relative to the window.
  394.   * At the moment only the part of the buffer by a size
  395.     71 = 0x37 bytes is used. Nevertheless it is recommended to use
  396.     1-Kb buffer for the future compatibility, in the future
  397.     some fields can be added.
  398.  
  399. ======================================================================
  400. ==================== Function 10 - wait for event. ===================
  401. ======================================================================
  402. If the message queue is empty, waits for appearance of the message
  403. in queue. In this state thread does not consume CPU time.
  404. Then reads out the message from queue.
  405.  
  406. Parameters:
  407.   * eax = 10 - function number
  408. Returned value:
  409.   * eax = event (see the list of events)
  410. Remarks:
  411.   * Those events are taken into account only which enter into
  412.     a mask set by function 40. By default it is
  413.     redraw, key and button events.
  414.   * To check, whether there is a message in queue, use function 11.
  415.     To wait for no more than given time, use function 23.
  416.  
  417. ======================================================================
  418. =============== Function 11 - check for event, no wait. ==============
  419. ======================================================================
  420. If the message queue contains event, function reads out
  421. and return it. If the queue is empty, function returns 0.
  422. Parameters:
  423.   * eax = 11 - function number
  424. Returned value:
  425.   * eax = 0 - message queue is empty
  426.   * else eax = event (see the list of events)
  427. Remarks:
  428.   * Those events are taken into account only, which enter into
  429.     a mask set by function 40. By default it is
  430.     redraw, key and button events.
  431.   * To wait for event, use function 10.
  432.     To wait for no more than given time, use function 23.
  433.  
  434. ======================================================================
  435. =============== Function 12 - begin/end window redraw. ===============
  436. ======================================================================
  437.  
  438. ---------------- Subfunction 1 - begin window redraw. ----------------
  439. Parameters:
  440.   * eax = 12 - function number
  441.   * ebx = 1 - subfunction number
  442. Returned value:
  443.   * function does not return value
  444.  
  445. ----------------- Subfunction 2 - end window redraw. -----------------
  446. Parameters:
  447.   * eax = 12 - function number
  448.   * ebx = 2 - subfunction number
  449. Returned value:
  450.   * function does not return value
  451. Remarks:
  452.   * Subfunction 1 deletes all buttons defined with
  453.     function 8, they must be defined again.
  454.  
  455. ======================================================================
  456. ============ Function 13 - draw a rectangle in the window. ===========
  457. ======================================================================
  458. Parameters:
  459.   * eax = 13 - function number
  460.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  461.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  462.   * edx = color 0xRRGGBB or 0x80RRGGBB for gradient fill
  463. Returned value:
  464.   * function does not return value
  465. Remarks:
  466.   * Coordinates are understood as coordinates of the left upper corner
  467.     of a rectangle relative to the window.
  468.  
  469. ======================================================================
  470. =================== Function 14 - get screen size. ===================
  471. ======================================================================
  472. Parameters:
  473.   * eax = 14 - function number
  474. Returned value:
  475.   * eax = [xsize]*65536 + [ysize], where
  476.   * xsize = x-coordinate of the right lower corner of the screen =
  477.             horizontal size - 1
  478.   * ysize = y-coordinate of the right lower corner of the screen =
  479.             vertical size - 1
  480. Remarks:
  481.   * See also subfunction 5 of function 48 - get sizes of
  482.     working area of the screen.
  483.  
  484. ======================================================================
  485. == Function 15, subfunction 1 - set a size of the background image. ==
  486. ======================================================================
  487. Parameters:
  488.   * eax = 15 - function number
  489.   * ebx = 1 - subfunction number
  490.   * ecx = width of the image
  491.   * edx = height of the image
  492. Returned value:
  493.   * function does not return value
  494. Remarks:
  495.   * Before calling subfunctions 2 and 5 you should call this function
  496.     to set image size!
  497.   * For update of the screen (after completion of a series of commands
  498.     working with a background) call subfunction 3.
  499.   * There is a pair function for get size of the background image -
  500.     subfunction 1 of function 39.
  501.  
  502. ======================================================================
  503. === Function 15, subfunction 2 - put pixel on the background image. ==
  504. ======================================================================
  505. Parameters:
  506.   * eax = 15 - function number
  507.   * ebx = 2 - subfunction number
  508.   * ecx = offset
  509.   * edx = color of a pixel 0xRRGGBB
  510. Returned value:
  511.   * function does not return value
  512. Remarks:
  513.   * Offset for a pixel with coordinates (x,y) is calculated as
  514.     (x+y*xsize)*3.
  515.   * If the given offset exceeds size set by subfunction 1,
  516.     the call is ignored.
  517.   * For update of the screen (after completion of a series of commands
  518.     working with a background) call subfunction 3.
  519.   * There is a pair function for get pixel on the background image -
  520.     subfunction 2 of function 39.
  521.  
  522. ======================================================================
  523. =========== Function 15, subfunction 3 - redraw background. ==========
  524. ======================================================================
  525. Parameters:
  526.   * eax = 15 - function number
  527.   * ebx = 3 - subfunction number
  528. Returned value:
  529.   * function does not return value
  530.  
  531. ======================================================================
  532. == Function 15, subfunction 4 - set drawing mode for the background. =
  533. ======================================================================
  534. Parameters:
  535.   * eax = 15 - function number
  536.   * ebx = 4 - subfunction number
  537.   * ecx = drawing mode:
  538.     * 1 = tile
  539.     * 2 = stretch
  540. Returned value:
  541.   * function does not return value
  542. Remarks:
  543.   * For update of the screen (after completion of a series of commands
  544.     working with a background) call subfunction 3.
  545.   * There is a pair function for get drawing mode of the background -
  546.     subfunction 4 of function 39.
  547.  
  548. ======================================================================
  549. ===================== Function 15, subfunction 5 =====================
  550. ============ Put block of pixels on the background image. ============
  551. ======================================================================
  552. Parameters:
  553.   * eax = 15 - function number
  554.   * ebx = 5 - subfunction number
  555.   * ecx = pointer to the data in the format BBGGRRBBGGRR...
  556.   * edx = offset in data of the background image
  557.   * esi = size of data in bytes = 3 * number of pixels
  558. Returned value:
  559.   * function does not return value
  560. Remarks:
  561.   * Offset and size are not checked for correctness.
  562.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  563.   * Pixels of the background image are written sequentially
  564.     from left to right, from up to down.
  565.   * Offset of pixel with coordinates (x,y) is (x+y*xsize)*3.
  566.   * For update of the screen (after completion of a series of commands
  567.     working with a background) call subfunction 3.
  568.  
  569. ======================================================================
  570. ===================== Function 15, subfunction 6 =====================
  571. ======== Map background data to the address space of process. ========
  572. ======================================================================
  573. Parameters:
  574.   * eax = 15 - function number
  575.   * ebx = 6 - subfunction number
  576. Returned value:
  577.   * eax = pointer to background data, 0 if error
  578. Remarks:
  579.   * Mapped data are available for read and write.
  580.   * Size of background data is 3*xsize*ysize. The system blocks
  581.     changes of background sizes while process works with mapped data.
  582.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  583.   * Pixels of the background image are written sequentially
  584.     from left to right, from up to down.
  585.  
  586. ======================================================================
  587. ===== Function 15, subfunction 7 - close mapped background data. =====
  588. ======================================================================
  589. Parameters:
  590.   * eax = 15 - function number
  591.   * ebx = 7 - subfunction number
  592.   * ecx = pointer to mapped data
  593. Returned value:
  594.   * eax = 1 - success, 0 - error
  595.  
  596. ======================================================================
  597. =============== Function 16 - save ramdisk on a floppy. ==============
  598. ======================================================================
  599. Parameters:
  600.   * eax = 16 - function number
  601.   * ebx = 1 or ebx = 2 - on which floppy save
  602. Returned value:
  603.   * eax = 0 - success
  604.   * eax = 1 - error
  605.  
  606. ======================================================================
  607. ======= Function 17 - get the identifier of the pressed button. ======
  608. ======================================================================
  609. Takes away the code of the pressed button from the buffer.
  610. Parameters:
  611.   * eax = 17 - function number
  612. Returned value:
  613.   * if the buffer is empty, function returns eax=1
  614.   * if the buffer is not empty:
  615.     * high 24 bits of eax contain button identifier (in particular,
  616.       ah contains low byte of the identifier; if all buttons have
  617.       the identifier less than 256, ah is enough to distinguish)
  618.     * al = 0 - the button was pressed with left mouse button
  619.     * al = bit corresponding to used mouse button otherwise
  620. Remarks:
  621.   * "Buffer" keeps only one button, at pressing the new button the
  622.     information about old is lost.
  623.   * The call of this function by an application with inactive window
  624.     will return answer "buffer is empty".
  625.   * Returned value for al corresponds to the state of mouse buttons
  626.     as in subfunction 2 of function 37 at the beginning
  627.     of button press, excluding lower bit, which is cleared.
  628.  
  629. ======================================================================
  630. ===================== Function 18, subfunction 1 =====================
  631. ============= Make deactive the window of the given thread. ==========
  632. ======================================================================
  633. Parameters:
  634.   * eax = 18 - function number
  635.   * ebx = 1 - subfunction number
  636.   * ecx = number of the thread slot
  637. Returned value:
  638.   * function does not return value
  639.        
  640. ======================================================================
  641. = Function 18, subfunction 2 - terminate process/thread by the slot. =
  642. ======================================================================
  643. Parameters:
  644.   * eax = 18 - function number
  645.   * ebx = 2 - subfunction number
  646.   * ecx = number of the slot of process/thread
  647. Returned value:
  648.   * function does not return value
  649. Remarks:
  650.   * It is impossible to terminate system thread OS/IDLE (with
  651.     number of the slot 1),
  652.     it is possible to terminate any normal process/thread.
  653.   * See also subfunction 18 - terminate
  654.     process/thread by the identifier.
  655.  
  656. ======================================================================
  657. ===================== Function 18, subfunction 3 =====================
  658. ============= Make active the window of the given thread. ============
  659. ======================================================================
  660. Parameters:
  661.   * eax = 18 - function number
  662.   * ebx = 3 - subfunction number
  663.   * ecx = number of the thread slot
  664. Returned value:
  665.   * function does not return value
  666. Remarks:
  667.   * If correct, but nonexistent slot is given,
  668.     some window is made active.
  669.   * To find out, which window is active, use subfunction 7.
  670.  
  671. ======================================================================
  672. ===================== Function 18, subfunction 4 =====================
  673. =========== Get counter of idle time units per one second. ===========
  674. ======================================================================
  675. Idle time units are units, in which the processor stands idle
  676. in waiting for interrupt (in the command 'hlt').
  677.  
  678. Parameters:
  679.   * eax = 18 - function number
  680.   * ebx = 4 - subfunction number
  681. Returned value:
  682.   * eax = value of the counter of idle time units per one second
  683.  
  684. ======================================================================
  685. ========== Function 18, subfunction 5 - get CPU clock rate. ==========
  686. ======================================================================
  687. Parameters:
  688.   * eax = 18 - function number
  689.   * ebx = 5 - subfunction number
  690. Returned value:
  691.   * eax = clock rate (modulo 2^32 clock ticks = 4GHz)
  692.  
  693. ======================================================================
  694.  Function 18, subfunction 6 - save ramdisk to the file on hard drive.
  695. ======================================================================
  696. Parameters:
  697.   * eax = 18 - function number
  698.   * ebx = 6 - subfunction number
  699.   * ecx = pointer to the full path to file
  700.     (for example, "/hd0/1/kolibri/kolibri.img")
  701. Returned value:
  702.   * eax = 0 - success
  703.   * else eax = error code of the file system
  704. Remarks:
  705.   * All folders in the given path must exist, otherwise function
  706.     returns value 5, "file not found".
  707.  
  708. ======================================================================
  709. =========== Function 18, subfunction 7 - get active window. ==========
  710. ======================================================================
  711. Parameters:
  712.   * eax = 18 - function number
  713.   * ebx = 7 - subfunction number
  714. Returned value:
  715.   * eax = number of the active window
  716.     (number of the slot of the thread with active window)
  717. Remarks:
  718.   * Active window is at the top of the window stack and receives
  719.     messages on all keyboard input.
  720.   * To make a window active, use subfunction 3.
  721.  
  722. ======================================================================
  723. == Function 18, subfunction 8 - disable/enable the internal speaker. =
  724. ======================================================================
  725. If speaker sound is disabled, all calls to subfunction 55 of
  726. function 55 are ignored. If speaker sound is enabled,
  727. they are routed on builtin speaker.
  728.  
  729. ------------------- Subsubfunction 1 - get status. -------------------
  730. Parameters:
  731.   * eax = 18 - function number
  732.   * ebx = 8 - subfunction number
  733.   * ecx = 1 - number of the subsubfunction
  734. Returned value:
  735.   * eax = 0 - speaker sound is enabled; 1 - disabled
  736.  
  737. ----------------- Subsubfunction 2 - toggle status. ------------------
  738. Toggles states of disable/enable.
  739. Parameters:
  740.   * eax = 18 - function number
  741.   * ebx = 8 - subfunction number
  742.   * ecx = 2 - number of the subsubfunction
  743. Returned value:
  744.   * function does not return value
  745.  
  746. ======================================================================
  747. == Function 18, subfunction 9 - system shutdown with the parameter. ==
  748. ======================================================================
  749. Parameters:
  750.   * eax = 18 - function number
  751.   * ebx = 9 - subfunction number
  752.   * ecx = parameter:
  753.     * 2 = turn off computer
  754.     * 3 = reboot computer
  755.     * 4 = restart the kernel from the file 'kernel.mnt' on ramdisk
  756. Returned value:
  757.   * at incorrect ecx the registers do not change (i.e. eax=18)
  758.   * by correct call function always returns eax=0
  759.     as the tag of success
  760. Remarks:
  761.   * Do not rely on returned value by incorrect call, it can be
  762.     changed in future versions of the kernel.
  763.  
  764. ======================================================================
  765. ===== Function 18, subfunction 10 - minimize application window. =====
  766. ======================================================================
  767. Minimizes the own window.
  768. Parameters:
  769.   * eax = 18 - function number
  770.   * ebx = 10 - subfunction number
  771. Returned value:
  772.   * function does not return value
  773. Remarks:
  774.   * The minimized window from the point of view of function 9
  775.     keeps position and sizes.
  776.   * Restoring of an application window occurs at its activation by
  777.     subfunction 3.
  778.   * Usually there is no necessity to minimize/restire a window
  779.     obviously: minimization of a window is carried out by the system
  780.     at pressing the minimization button (for skinned windows
  781.     it is defined automatically by function 0,
  782.     for other windows it can be defined manually by function 8),
  783.     restore of a window is done by the application '@panel'.
  784.  
  785. ======================================================================
  786.  Function 18, subfunction 11 - get information on the disk subsystem.
  787. ======================================================================
  788. Parameters:
  789.   * eax = 18 - function number
  790.   * ebx = 11 - subfunction number
  791.   * ecx = type of the table:
  792.     * 1 = short version, 10 bytes
  793.     * 2 = full version, 65536 bytes
  794.   * edx = pointer to the buffer (in the application) for the table
  795. Returned value:
  796.   * function does not return value
  797. Format of the table: short version:
  798.   * +0: byte: information about FDD's (drives for floppies),
  799.     AAAABBBB, where AAAA gives type of the first drive, BBBB -
  800.     of the second regarding to the following list:
  801.     * 0 = there is no drive
  802.     * 1 = 360Kb, 5.25''
  803.     * 2 = 1.2Mb, 5.25''
  804.     * 3 = 720Kb, 3.5''
  805.     * 4 = 1.44Mb, 3.5''
  806.     * 5 = 2.88Mb, 3.5'' (such drives are not used anymore)
  807.     For example, for the standard configuration from one 1.44-drive
  808.     here will be 40h, and for the case 1.2Mb on A: and 1.44Mb on B:
  809.     the value is 24h.
  810.   * +1: byte: information about hard disks and CD-drives, AABBCCDD,
  811.     where AA corresponds to the controller IDE0, ..., DD - IDE3:
  812.     * 0 = device is absent
  813.     * 1 = hard drive
  814.     * 2 = CD-drive
  815.     For example, in the case HD on IDE0 and CD on IDE2
  816.     this field contains 48h.
  817.   * +2: 4 db: number of the retrieved partitions on hard disks
  818.     at accordingly IDE0,...,IDE3.
  819.     If the hard disk on IDEx is absent, appropriate byte is zero,
  820.     otherwise it shows number of the recognized partitions, which
  821.     can be not presented (if the drive is not formatted or if
  822.     the file system is not supported). Current version of the kernel
  823.     supports only FAT16, FAT32 and NTFS for hard disks.
  824.   * +6: 4 db: reserved
  825. Format of the table: full version:
  826.   * +0: 10 db: same as for the short version
  827.   * +10: 100 db: data for the first partition
  828.   * +110: 100 db: data for the second partition
  829.   * ...
  830.   * +10+100*(n-1): 100 db: data for the last partition
  831. The partitions are located as follows: at first sequentially all
  832. recoginzed partitions on HD on IDE0 (if present),
  833. then on HD on IDE1 (if present) and so on up to IDE3.
  834. Format of the information about partition
  835. (at moment only FAT is supported):
  836.   * +0: dword: first physical sector of the partition
  837.   * +4: dword: last physical sector of the partition
  838.     (belongs to the partition)
  839.   * +8: byte: file system type:
  840.     16=FAT16, 32=FAT32, 1=NTFS
  841.   * other data are dependent on file system, are modified with
  842.     kernel modifications and therefore are not described
  843. Remarks:
  844.   * The short table can be used for obtaining the information about
  845.     available devices.
  846.  
  847. ======================================================================
  848. ========== Function 18, subfunction 13 - get kernel version. =========
  849. ======================================================================
  850. Parameters:
  851.   * eax = 18 - function number
  852.   * ebx = 13 - subfunction number
  853.   * ecx = pointer to the buffer (not less than 16 bytes), where
  854.     the information will be placed
  855. Returned value:
  856.   * function does not return value
  857. Structure of the buffer:
  858. db a,b,c,d for version a.b.c.d
  859. db 0: reserved
  860. dd REV - kernel SVN revision number
  861. For Kolibri 0.7.7.0+ kernel:
  862. db 0,7,7,0
  863. db 0
  864. dd 1675
  865.  
  866. ======================================================================
  867. ======= Function 18, subfunction 14 - wait for screen retrace. =======
  868. ======================================================================
  869. Waits for the beginning of retrace of the scanning ray of the screen
  870. monitor.
  871. Parameters:
  872.   * eax = 18 - function number
  873.   * ebx = 14 - subfunction number
  874. Returned value:
  875.   * eax = 0 as the tag of success
  876. Remarks:
  877.   * Function is intended only for active high-efficiency graphics
  878.     applications; is used for smooth output of a graphics.
  879.  
  880. ======================================================================
  881. == Function 18, subfunction 15 - center mouse cursor on the screen. ==
  882. ======================================================================
  883. Parameters:
  884.   * eax = 18 - function number
  885.   * ebx = 15 - subfunction number
  886. Returned value:
  887.   * eax = 0 as the tag of success
  888.  
  889. ======================================================================
  890. ========= Function 18, subfunction 16 - get size of free RAM. ========
  891. ======================================================================
  892. Parameters:
  893.   * eax = 18 - function number
  894.   * ebx = 16 - subfunction number
  895. Returned value:
  896.   * eax = size of free memory in kilobytes
  897.  
  898. ======================================================================
  899. ======== Function 18, subfunction 17 - get full amount of RAM. =======
  900. ======================================================================
  901. Parameters:
  902.   * eax = 18 - function number
  903.   * ebx = 17 - subfunction number
  904. Returned value:
  905.   * eax = total size of existing memory in kilobytes
  906.  
  907. ======================================================================
  908. ===================== Function 18, subfunction 18 ====================
  909. ============= Terminate process/thread by the identifier. ============
  910. ======================================================================
  911. Parameters:
  912.   * eax = 18 - function number
  913.   * ebx = 18 - subfunction number
  914.   * ecx = identifer of process/thread (PID/TID)
  915. Returned value:
  916.   * eax = 0 - success
  917.   * eax = -1 - error (process is not found or is system)
  918. Remarks:
  919.   * It is impossible to terminate system thread OS/IDLE (identifier
  920.     1), it is possible to terminate any normal process/thread.
  921.   * See also subfunction 2 - terminate
  922.     process/thread by given slot.
  923.  
  924. ======================================================================
  925. ======== Function 18, subfunction 19 - get/set mouse features. =======
  926. ======================================================================
  927.  
  928. ---------------- Subsubfunction 0 - get mouse speed. -----------------
  929. Parameters:
  930.   * eax = 18 - function number
  931.   * ebx = 19 - subfunction number
  932.   * ecx = 0 - subsubfunction number
  933. Returned value:
  934.   * eax = current mouse speed
  935.  
  936. ---------------- Subsubfunction 1 - set mouse speed. -----------------
  937. Parameters:
  938.   * eax = 18 - function number
  939.   * ebx = 19 - subfunction number
  940.   * ecx = 1 - subsubfunction number
  941.   * edx = new value for speed
  942. Returned value:
  943.   * function does not return value
  944.  
  945. ---------------- Subsubfunction 2 - get mouse delay. -----------------
  946. Parameters:
  947.   * eax = 18 - function number
  948.   * ebx = 19 - subfunction number
  949.   * ecx = 2 - subsubfunction number
  950. Returned value:
  951.   * eax = current mouse delay
  952.  
  953. ---------------- Subsubfunction 3 - set mouse delay. -----------------
  954. Parameters:
  955.   * eax = 18 - function number
  956.   * ebx = 19 - subfunction number
  957.   * ecx = 3 - subsubfunction number
  958.   * edx = new value for mouse delay
  959. Returned value:
  960.   * function does not return value
  961.  
  962. ----------- Subsubfunction 4 - set mouse pointer position. -----------
  963. Parameters:
  964.   * eax = 18 - function number
  965.   * ebx = 19 - subfunction number
  966.   * ecx = 4 - subsubfunction number
  967.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  968. Returned value:
  969.   * function does not return value
  970.  
  971. -------- Subsubfunction 5 - simulate state of mouse buttons. ---------
  972. Parameters:
  973.   * eax = 18 - function number
  974.   * ebx = 19 - subfunction number
  975.   * ecx = 5 - subsubfunction number
  976.   * edx = information about emulated state of mouse buttons:
  977.     (same as return value in subfunction 2 of function 37)
  978.     * bit 0 is set = left button is pressed
  979.     * bit 1 is set = right button is pressed
  980.     * bit 2 is set = middle button is pressed
  981.     * bit 3 is set = 4th button is pressed
  982.     * bit 4 is set = 5th button is pressed
  983. Returned value:
  984.   * function does not return value
  985. Remarks:
  986.   * It is recommended to set speed of the mouse (in subsubfunction 1)
  987.     from 1 up to 9. The installed value is not inspected by the kernel
  988.     code, so set it carefully, at incorrect value the cursor
  989.     can "freeze". Speed of the mouse can be regulated through the
  990.     application SETUP.
  991.   * Recommended delay of the mouse (in subsubfunction 3) = 10. Lower
  992.     value is not handled by COM mice. At the very large values the
  993.     movement of the mouse on 1 pixel is impossible and the cursor will
  994.     jump on the value of installed speed (subsubfunction 1). The
  995.     installed value is not inspected by the kernel code.
  996.     Mouse delay can be regulated through the application SETUP.
  997.   * The subsubfunction 4 does not check the passed value. Before
  998.     its call find out current screen resolution (with function 14)
  999.     and check that the value of position is inside the limits of the
  1000.     screen.
  1001.  
  1002. ======================================================================
  1003. ======== Function 18, subfunction 20 - get information on RAM. =======
  1004. ======================================================================
  1005. Parameters:
  1006.   * eax = 18 - function number
  1007.   * ebx = 20 - subfunction number
  1008.   * ecx = pointer to the buffer for information (36 bytes)
  1009. Returned value:
  1010.   * eax = total size of existing RAM in pages
  1011.     or -1 if error has occured
  1012.   * buffer pointed to by ecx contains the following information:
  1013.     * +0:  dword: total size of existing RAM in pages
  1014.     * +4:  dword: size of free RAM in pages
  1015.     * +8:  dword: number of page faults (exceptions #PF)
  1016.                  in applications
  1017.     * +12: dword: size of kernel heap in bytes
  1018.     * +16: dword: free in kernel heap in bytes
  1019.     * +20: dword: total number of memory blocks in kernel heap
  1020.     * +24: dword: number of free memory blocks in kernel heap
  1021.     * +28: dword: size of maximum free block in kernel heap
  1022.                  (reserved)
  1023.     * +32: dword: size of maximum allocated block in kernel heap
  1024.                  (reserved)
  1025.  
  1026. ======================================================================
  1027. ===================== Function 18, subfunction 21 ====================
  1028. ======== Get slot number of process/thread by the identifier. ========
  1029. ======================================================================
  1030. Parameters:
  1031.   * eax = 18 - function number
  1032.   * ebx = 21 - subfunction number
  1033.   * ecx = identifer of process/thread (PID/TID)
  1034. Returned value:
  1035.   * eax = 0 - error (invalid identifier)
  1036.   * otherwise eax = slot number
  1037.  
  1038. ======================================================================
  1039. ===================== Function 18, subfunction 22 ====================
  1040. ============== Operations with window of another thread. =============
  1041. ======================================================================
  1042. Parameters:
  1043.   * eax = 18 - function number
  1044.   * ebx = 22 - subfunction number
  1045.   * ecx = operation type:
  1046.     * 0 = minimize window of the thread with given slot number
  1047.     * 1 = minimize window of the thread with given identifier
  1048.     * 2 = restore window of the thread with given slot number
  1049.     * 3 = restore window of the thread with given identifier
  1050.   * edx = parameter (slot number or PID/TID)
  1051. Returned value:
  1052.   * eax = 0 - success
  1053.   * eax = -1 - error (invalid identifier)
  1054. Remarks:
  1055.   * The thread can minimize its window with subfunction 10.
  1056.   * One can restore and activate window simultaneously with
  1057.     subfunction 3 (which requires slot number).
  1058.  
  1059. ======================================================================
  1060. ==================== Function 20 - MIDI interface. ===================
  1061. ======================================================================
  1062.  
  1063. ----------------------- Subfunction 1 - reset ------------------------
  1064. Parameters:
  1065.   * eax = 20 - function number
  1066.   * ebx = 1 - subfunction number
  1067.  
  1068. -------------------- Subfunction 2 - output byte ---------------------
  1069. Parameters:
  1070.   * eax = 20 - function number
  1071.   * ebx = 2 - subfunction number
  1072.   * cl = byte for output
  1073. Returned value (is the same for both subfunctions):
  1074.   * eax = 0 - success
  1075.   * eax = 1 - base port is not defined
  1076. Remarks:
  1077.   * Previously the base port must be defined by
  1078.     subfunction 1 of function 21.
  1079.  
  1080. ======================================================================
  1081. ======== Function 21, subfunction 1 - set MPU MIDI base port. ========
  1082. ======================================================================
  1083. Parameters:
  1084.   * eax = 21 - function number
  1085.   * ebx = 1 - subfunction number
  1086.   * ecx = number of base port
  1087. Returned value
  1088.   * eax = 0 - success
  1089.   * eax = -1 - erratic number of a port
  1090. Remarks:
  1091.   * Number of a port must satisfy to conditions 0x100<=ecx<=0xFFFF.
  1092.   * The installation of base is necessary for function 20.
  1093.   * To get base port use subfunction 1 of function 26.
  1094.  
  1095. ======================================================================
  1096. ========== Function 21, subfunction 2 - set keyboard layout. =========
  1097. ======================================================================
  1098. Keyboard layout is used to convert keyboard scancodes to ASCII-codes,
  1099. which will be read by function 2.
  1100. Parameters:
  1101.   * eax = 21 - function number
  1102.   * ebx = 2 - subfunction number
  1103.   * ecx = which layout to set:
  1104.     * 1 = normal layout
  1105.     * 2 = layout at pressed Shift
  1106.     * 3 = layout at pressed Alt
  1107.   * edx = pointer to layout - table of length 128 bytes
  1108. Or:
  1109.   * ecx = 9
  1110.   * dx = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1111. Returned value:
  1112.   * eax = 0 - success
  1113.   * eax = 1 - incorrect parameter
  1114. Remarks:
  1115.   * If Alt is pressed, the layout with Alt is used;
  1116.     if Alt is not pressed, but Shift is pressed,
  1117.     the layout with Shift is used;
  1118.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1119.     layout is used and then from the code is subtracted 0x60;
  1120.     if no control key is pressed, the normal layout is used.
  1121.   * To get layout and country identifier use
  1122.     subfunction 2 of function 26.
  1123.   * Country identifier is global system variable, which is not used
  1124.     by the kernel itself; however the application '@panel' displays
  1125.     the corresponding icon.
  1126.   * The application @panel switches layouts on user request.
  1127.  
  1128. ======================================================================
  1129. ============== Function 21, subfunction 3 - set CD base. =============
  1130. ======================================================================
  1131. Parameters:
  1132.   * eax = 21 - function number
  1133.   * ebx = 3 - subfunction number
  1134.   * ecx = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1135. Returned value:
  1136.   * eax = 0
  1137. Remarks:
  1138.   * CD base is used by function 24.
  1139.   * To get CD base use subfunction 3 of function 26.
  1140.  
  1141. ======================================================================
  1142. ========== Function 21, subfunction 5 - set system language. =========
  1143. ======================================================================
  1144. Parameters:
  1145.   * eax = 21 - function number
  1146.   * ebx = 5 - subfunction number
  1147.   * ecx = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1148. Returned value:
  1149.   * eax = 0
  1150. Remarks:
  1151.   * System language is global system variable and is not used
  1152.     by the kernel itself, however application @panel draws the
  1153.     appropriate icon.
  1154.   * Function does not check for correctness, as the kernel does not
  1155.     use this variable.
  1156.   * To get system language use subfunction 5 of function 26.
  1157.  
  1158. ======================================================================
  1159. ============== Function 21, subfunction 7 - set HD base. =============
  1160. ======================================================================
  1161. The HD base defines hard disk to write with usage of obsolete
  1162. syntax /HD in obsolete function 58; at usage of modern syntax
  1163. /HD0,/HD1,/HD2,/HD3 base is set automatically.
  1164. Parameters:
  1165.   * eax = 21 - function number
  1166.   * ebx = 7 - subfunction number
  1167.   * ecx = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1168. Returned value:
  1169.   * eax = 0
  1170. Remarks:
  1171.   * Any application at any time can change the base.
  1172.   * Do not change base, when any application works with hard disk.
  1173.     If you do not want system bugs.
  1174.   * To get HD base use subfunction 7 of function 26.
  1175.   * It is also necessary to define used partition of hard disk by
  1176.     subfunction 8.
  1177.  
  1178. ======================================================================
  1179. ========= Function 21, subfunction 8 - set used HD partition. ========
  1180. ======================================================================
  1181. The HD partition defines partition of the hard disk to write with
  1182. usage of obsolete syntax /HD and obsolete function 58;
  1183. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1184. base and partition are set automatically.
  1185. Parameters:
  1186.   * eax = 21 - function number
  1187.   * ebx = 8 - subfunction number
  1188.   * ecx = HD partition (beginning from 1)
  1189. Return value:
  1190.   * eax = 0
  1191. Remarks:
  1192.   * Any application at any time can change partition.
  1193.   * Do not change partition when any application works with hard disk.
  1194.     If you do not want system bugs.
  1195.   * To get used partition use subfunction 8 of function 26.
  1196.   * There is no correctness checks.
  1197.   * To get the number of partitions of a hard disk use
  1198.     subfunction 11 of function 18.
  1199.   * It is also necessary to define used HD base by subfunction 7.
  1200.  
  1201. ======================================================================
  1202.  Function 21, subfunction 11 - enable/disable low-level access to HD.
  1203. ======================================================================
  1204. Parameters:
  1205.   * eax = 21 - function number
  1206.   * ebx = 11 - subfunction number
  1207.   * ecx = 0/1 - disable/enable
  1208. Returned value:
  1209.   * eax = 0
  1210. Remarks:
  1211.   * Is used in LBA-read (subfunction 8 of function 58).
  1212.   * The current implementation uses only low bit of ecx.
  1213.   * To get current status use subfunction 11 of function 26.
  1214.  
  1215. ======================================================================
  1216.  Function 21, subfunction 12 - enable/disable low-level access to PCI.
  1217. ======================================================================
  1218. Parameters:
  1219.   * eax = 21 - function number
  1220.   * ebx = 12 - subfunction number
  1221.   * ecx = 0/1 - disable/enable
  1222. Returned value:
  1223.   * eax = 0
  1224. Remarks:
  1225.   * Is used in operations with PCI bus (function 62).
  1226.   * The current implementation uses only low bit of ecx.
  1227.   * To get current status use subfunction 12 of function 26.
  1228.  
  1229. ======================================================================
  1230. ============ Function 21, subfunction 13, subsubfunction 1 ===========
  1231. ======== Initialize + get information on the driver vmode.mdr. =======
  1232. ======================================================================
  1233. Parameters:
  1234.   * eax = 21 - function number
  1235.   * ebx = 13 - subfunction number
  1236.   * ecx = 1 - number of the driver function
  1237.   * edx = pointer to 512-bytes buffer
  1238. Returned value:
  1239.   * if driver is not loaded
  1240.     (never happens in the current implementation):
  1241.     * eax = -1
  1242.     * ebx, ecx destroyed
  1243.   * if driver is loaded:
  1244.     * eax = 'MDAZ' (in fasm style, that is 'M' - low byte, 'Z' - high)
  1245.       - signature
  1246.     * ebx = current frequency of the scanning (in Hz)
  1247.     * ecx destroyed
  1248.     * buffer pointed to by edx is filled
  1249. Format of the buffer:
  1250.   * +0: 32*byte: driver name, "Trans VideoDriver"
  1251.     (without quotes, supplemented by spaces)
  1252.   * +32 = +0x20: dword: driver version (version x.y is encoded as
  1253.     y*65536+x), for the current implementation is 1 (1.0)
  1254.   * +36 = +0x24: 7*dword: reserved (0 in the current implementation)
  1255.   * +64 = +0x40: 32*word: list of supported videomodes (each word
  1256.     is number of a videomode, after list itself there are zeroes)
  1257.   * +128 = +0x80: 32*(5*word): list of supported frequences of the
  1258.     scannings for videomodes: for each videomode listed in the
  1259.     previous field up to 5 supported frequences are given
  1260.     (unused positions contain zeroes)
  1261. Remarks:
  1262.   * Function initializes the driver (if it is not initialized yet)
  1263.     and must be called first, before others (otherwise they will do
  1264.     nothing and return -1).
  1265.   * The current implementation supports only one frequency
  1266.     of the scanning on videomode.
  1267.  
  1268. ======================================================================
  1269. ============ Function 21, subfunction 13, subsubfunction 2 ===========
  1270. ================ Get information on current videomode. ===============
  1271. ======================================================================
  1272. Parameters:
  1273.   * eax = 21 - function number
  1274.   * ebx = 13 - subfunction number
  1275.   * ecx = 2 - number of the driver function
  1276. Returned value:
  1277.   * eax = -1 - driver is not loaded or not initialized;
  1278.     ebx,ecx are destroyed
  1279.   * eax = [width]*65536 + [height]
  1280.   * ebx = frequency of the vertical scanning (in Hz)
  1281.   * ecx = number of current videomode
  1282. Remarks:
  1283.   * Driver must be initialized by call to
  1284.     driver function 1.
  1285.   * If only screen sizes are required, it is more expedient to use
  1286.     function 14 taking into account that it
  1287.     returns sizes on 1 less.
  1288.  
  1289. ======================================================================
  1290. === Function 21, subfunction 13, subsubfunction 3 - set videomode. ===
  1291. ======================================================================
  1292. Parameters:
  1293.   * eax = 21 - function number
  1294.   * ebx = 13 - subfunction number
  1295.   * ecx = 3 - number of the driver function
  1296.   * edx = [scanning frequency]*65536 + [videomode number]
  1297. Returned value:
  1298.   * eax = -1 - driver is not loaded, not initialized or
  1299.     an error has occured
  1300.   * eax = 0 - success
  1301.   * ebx, ecx destroyed
  1302. Remarks:
  1303.   * Driver must be initialized by driver function 1.
  1304.   * The videomode number and frequency must be in the table
  1305.     returned by driver function 1.
  1306.  
  1307. ======================================================================
  1308. ============ Function 21, subfunction 13, subsubfunction 4 ===========
  1309. ================== Return to the initial videomode. ==================
  1310. ======================================================================
  1311. Returns the screen to the videomode set at system boot.
  1312. Parameters:
  1313.   * eax = 21 - function number
  1314.   * ebx = 13 - subfunction number
  1315.   * ecx = 4 - number of the driver function
  1316. Returned value:
  1317.   * eax = -1 - driver is not loaded or not initialized
  1318.   * eax = 0 - success
  1319.   * ebx, ecx destroyed
  1320. Remarks:
  1321.   * Driver must be initialized by call to driver function 1.
  1322.  
  1323. ======================================================================
  1324. ============ Function 21, subfunction 13, subsubfunction 5 ===========
  1325. ===== Increase/decrease the size of the visible area of monitor. =====
  1326. ======================================================================
  1327. Parameters:
  1328.   * eax = 21 - function number
  1329.   * ebx = 13 - subfunction number
  1330.   * ecx = 5 - number of the driver function
  1331.   * edx = 0/1 - decrease/increase horizontal size on 1 position
  1332.   * edx = 2/3 - is not supported in the current implementation;
  1333.     is planned as decrease/increase vertical size on 1 position
  1334. Returned value:
  1335.   * eax = -1 - driver is not loaded or not initialized
  1336.   * eax = 0 - success
  1337.   * ebx, ecx destroyed
  1338. Remarks:
  1339.   * Driver must be initialized by call to driver function 1.
  1340.   * Function influences only the physical size of the screen image;
  1341.     the logical size (number of pixels) does not change.
  1342.  
  1343. ======================================================================
  1344. ================= Function 22 - set system date/time. ================
  1345. ======================================================================
  1346. Parameters:
  1347.   * eax = 22 - function number
  1348.   * ebx = 0 - set time
  1349.     * ecx = 0x00SSMMHH - time in the binary-decimal code (BCD):
  1350.     * HH=hour 00..23
  1351.     * MM=minute 00..59
  1352.     * SS=second 00..59
  1353.   * ebx = 1 - set date
  1354.     * ecx = 0x00DDMMYY - date in the binary-decimal code (BCD):
  1355.     * DD=day 01..31
  1356.     * MM=month 01..12
  1357.     * YY=year 00..99
  1358.   * ebx = 2 - set day of week
  1359.     * ecx = 1 for Sunday, ..., 7 for Saturday
  1360.   * ebx = 3 - set alarm clock
  1361.     * ecx = 0x00SSMMHH
  1362. Returned value:
  1363.   * eax = 0 - success
  1364.   * eax = 1 - incorrect parameter
  1365.   * eax = 2 - CMOS-battery was unloaded
  1366. Remarks:
  1367.   * Value of installation of day of week seems to be doubtful,
  1368.     as it a little where is used
  1369.     (day of week can be calculated by date).
  1370.   * Alarm clock can be set on operation in the given time every day.
  1371.     But there is no existing system function to disable it.
  1372.   * Operation of alarm clock consists in generation IRQ8.
  1373.   * Generally CMOS supports for alarm clock set of value 0xFF
  1374.     as one of parameters and it means that the appropriate parameter
  1375.     is ignored. But current implementation does not allow this
  1376.     (will return 1).
  1377.   * Alarm clock is a global system resource; the set of
  1378.     an alarm clock cancels automatically the previous set.
  1379.     However, at moment no program uses it.
  1380.  
  1381. ======================================================================
  1382. ============= Function 23 - wait for event with timeout. =============
  1383. ======================================================================
  1384. If the message queue is empty, waits for new message in the queue,
  1385. but no more than given time. Then reads out a message from the queue.
  1386.  
  1387. Parameters:
  1388.   * eax = 23 - function number
  1389.   * ebx = timeout (in 1/100 of second)
  1390. Returned value:
  1391.   * eax = 0 - the message queue is empty
  1392.   * otherwise eax = event (see the list of events)
  1393. Remarks:
  1394.   * Only those events are taken into account, which enter into
  1395.     the mask set by function 40. By default it is
  1396.     redraw, key and button events.
  1397.   * To check for presence of a message in the queue use function 11.
  1398.     To wait without timeout use function 10.
  1399.   * Transmission ebx=0 results in immediate returning eax=0.
  1400.   * Current implementation returns immediately with eax=0,
  1401.     if the addition of ebx with the current value of time counter
  1402.     makes 32-bit overflow.
  1403.  
  1404. ======================================================================
  1405. ======== Function 24, subfunction 1 - begin to play CD-audio. ========
  1406. ======================================================================
  1407. Parameters:
  1408.   * eax = 24 - function number
  1409.   * ebx = 1 - subfunction number
  1410.   * ecx = 0x00FRSSMM, where
  1411.     * MM = starting minute
  1412.     * SS = starting second
  1413.     * FR = starting frame
  1414. Returned value:
  1415.   * eax = 0 - success
  1416.   * eax = 1 - CD base is not defined
  1417. Remarks:
  1418.   * Previously CD base must be defined by the call to
  1419.     subfunction 3 of function 21.
  1420.   * One second includes 75 frames, one minute includes 60 seconds.
  1421.   * The function is asynchronous (returns control, when play begins).
  1422.  
  1423. ======================================================================
  1424. ======= Function 24, subfunction 2 - get information on tracks. ======
  1425. ======================================================================
  1426. Parameters:
  1427.   * eax = 24 - function number
  1428.   * ebx = 2 - subfunction number
  1429.   * ecx = pointer to the buffer for the table
  1430.     (maximum 8*64h+4 bytes=100 tracks)
  1431. Returned value:
  1432.   * eax = 0 - success
  1433.   * eax = 1 - CD base is not defined
  1434. Remarks:
  1435.   * The format of the table with tracks information is the same as
  1436.     for ATAPI-CD command 43h (READ TOC), usual table (subcommand 00h).
  1437.     Function returns addresses in MSF.
  1438.   * Previously CD base port must be set by call to
  1439.     subfunction 3 of function 21.
  1440.   * Function returns information only about no more than 100
  1441.     first tracks. In most cases it is enough.
  1442.  
  1443. ======================================================================
  1444. ========== Function 24, subfunction 3 - stop play CD-audio. ==========
  1445. ======================================================================
  1446. Parameters:
  1447.   * eax = 24 - function number
  1448.   * ebx = 1 - subfunction number
  1449. Returned value:
  1450.   * eax = 0 - success
  1451.   * eax = 1 - CD base is not defined
  1452. Remarks:
  1453.   * Previously CD base port must be defined by call to
  1454.     subfunction 3 of function 21.
  1455.  
  1456. ======================================================================
  1457. ======= Function 24, subfunction 4 - eject tray of disk drive. =======
  1458. ======================================================================
  1459. Parameters:
  1460.   * eax = 24 - function number
  1461.   * ebx = 4 - subfunction number
  1462.   * ecx = position of CD/DVD-drive
  1463.       (from 0=Primary Master to 3=Secondary Slave)
  1464. Returned value:
  1465.   * function does not return value
  1466. Remarks:
  1467.   * The function is supported only for ATAPI devices (CD and DVD).
  1468.   * When the tray is being ejected,
  1469.     manual control of tray is unlocked.
  1470.   * When the tray is being ejected, the code clears the cache for
  1471.     corresponding device.
  1472.   * An example of usage of the function is the application CD_tray.
  1473.  
  1474. ======================================================================
  1475. ======== Function 24, subfunction 5 - load tray of disk drive. =======
  1476. ======================================================================
  1477. Parameters:
  1478.   * eax = 24 - function number
  1479.   * ebx = 5 - subfunction number
  1480.   * ecx = position of CD/DVD-drive
  1481.       (from 0=Primary Master to 3=Secondary Slave)
  1482. Returned value:
  1483.   * function does not return value
  1484. Remarks:
  1485.   * The function is supported only for ATAPI devices (CD and DVD).
  1486.   * An example of usage of the function is the application CD_tray.
  1487.  
  1488. ======================================================================
  1489. ======== Function 26, subfunction 1 - get MPU MIDI base port. ========
  1490. ======================================================================
  1491. Parameters:
  1492.   * eax = 26 - function number
  1493.   * ebx = 1 - subfunction number
  1494. Returned value:
  1495.   * eax = port number
  1496. Parameters:
  1497.   * To set base port use subfunction 1 of function 21.
  1498.  
  1499. ======================================================================
  1500. ========== Function 26, subfunction 2 - get keyboard layout. =========
  1501. ======================================================================
  1502. The keyboard layout is used to convert keyboard scancodes to
  1503. ASCII-codes for function 2.
  1504. Parameters:
  1505.   * eax = 26 - function number
  1506.   * ebx = 2 - subfunction number
  1507.   * ecx = what layout to get:
  1508.     * 1 = normal layout
  1509.     * 2 = layout with pressed Shift
  1510.     * 3 = layout with pressed Alt
  1511.   * edx = pointer to the 128-bytes buffer, where the layout will be
  1512.     copied
  1513. Returned value:
  1514.   * function does not return value
  1515. Or:
  1516.   * eax = 26 - function number
  1517.   * ebx = 2 - subfunction number
  1518.   * ecx = 9
  1519. Returned value:
  1520.   * eax = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1521. Remarks:
  1522.   * If Alt is pressed, the layout with Alt is used;
  1523.     if Alt is not pressed, but Shift is pressed,
  1524.     the layout with Shift is used;
  1525.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1526.     layout is used and then from the code is subtracted 0x60;
  1527.     if no control key is pressed, the normal layout is used.
  1528.   * To set layout and country identifier use
  1529.     subfunction 2 of function 21.
  1530.   * Country identifier is global system variable, which is not used
  1531.     by the kernel itself; however the application '@panel' displays
  1532.     the corresponding icon (using this function).
  1533.   * The application @panel switches layouts on user request.
  1534.  
  1535. ======================================================================
  1536. ============== Function 26, subfunction 3 - get CD base. =============
  1537. ======================================================================
  1538. Parameters:
  1539.   * eax = 26 - function number
  1540.   * ebx = 3 - subfunction number
  1541. Returned value:
  1542.   * eax = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1543. Remarks:
  1544.   * CD base is used by function 24.
  1545.   * To set CD base use subfunction 3 of function 21.
  1546.  
  1547. ======================================================================
  1548. ========== Function 26, subfunction 5 - get system language. =========
  1549. ======================================================================
  1550. Parameters:
  1551.   * eax = 26 - function number
  1552.   * ebx = 5 - subfunction number
  1553. Returned value:
  1554.   * eax = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1555. Remarks:
  1556.   * System language is global system variable and is not used
  1557.     by the kernel itself, however application @panel draws the
  1558.     appropriate icon (using this function).
  1559.   * To set system language use subfunction 5 of function 21.
  1560.  
  1561. ======================================================================
  1562. ============== Function 26, subfunction 7 - get HD base. =============
  1563. ======================================================================
  1564. The HD base defines hard disk to write with usage of obsolete
  1565. syntax /HD in obsolete function 58; at usage of modern syntax
  1566. /HD0,/HD1,/HD2,/HD3 base is set automatically.
  1567. Parameters:
  1568.   * eax = 26 - function number
  1569.   * ebx = 7 - subfunction number
  1570. Returned value:
  1571.   * eax = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1572. Remarks:
  1573.   * Any application in any time can change HD base.
  1574.   * To set base use subfunction 7 of function 21.
  1575.   * To get used partition of hard disk use subfunction 8.
  1576.  
  1577. ======================================================================
  1578. ========= Function 26, subfunction 8 - get used HD partition. ========
  1579. ======================================================================
  1580. The HD partition defines partition of the hard disk to write with
  1581. usage of obsolete syntax /HD in obsolete function 58;
  1582. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1583. base and partition are set automatically.
  1584. Parameters:
  1585.   * eax = 26 - function number
  1586.   * ebx = 8 - subfunction number
  1587. Returned value:
  1588.   * eax = HD partition (beginning from 1)
  1589. Remarks:
  1590.   * Any application in any time can change partition.
  1591.   * To set partition use subfunction 8 of function 21.
  1592.   * To get number of partitions on a hard disk use
  1593.     subfunction 11 of function 18.
  1594.   * To get base of used hard disk, use subfunction 7.
  1595.  
  1596. ======================================================================
  1597. === Function 26, subfunction 9 - get the value of the time counter. ==
  1598. ======================================================================
  1599. Parameters:
  1600.   * eax = 26 - function number
  1601.   * ebx = 9 - subfunction number
  1602. Returned value:
  1603.   * eax = number of 1/100s of second, past from the system boot time
  1604. Remarks:
  1605.   * Counter takes modulo 2^32, that correspond to a little more
  1606.     than 497 days.
  1607.   * To get system time use function 3.
  1608.  
  1609. ======================================================================
  1610. ===================== Function 26, subfunction 11 ====================
  1611. ========== Find out whether low-level HD access is enabled. ==========
  1612. ======================================================================
  1613. Parameters:
  1614.   * eax = 26 - function number
  1615.   * ebx = 11 - subfunction number
  1616. Returned value:
  1617.   * eax = 0/1 - disabled/enabled
  1618. Remarks:
  1619.   * Is used in LBA read (subfunction 8 of function 58).
  1620.   * To set current state use subfunction 11 of function 21.
  1621.  
  1622. ======================================================================
  1623. ===================== Function 26, subfunction 12 ====================
  1624. ========== Find out whether low-level PCI access is enabled. =========
  1625. ======================================================================
  1626. Parameters:
  1627.   * eax = 26 - function number
  1628.   * ebx = 12 - subfunction number
  1629. Returned value:
  1630.   * eax = 0/1 - disabled/enabled
  1631. Remarks:
  1632.   * Is used by operations with PCI bus (function 62).
  1633.   * The current implementation uses only low bit of ecx.
  1634.   * To set the current state use subfunction 12 of function 21.
  1635.  
  1636. ======================================================================
  1637. =================== Function 29 - get system date. ===================
  1638. ======================================================================
  1639. Parameters:
  1640.   * eax = 29 - function number
  1641. Returned value:
  1642.   * eax = 0x00DDMMYY, where
  1643.     (binary-decimal coding, BCD, is used)
  1644.   * YY = two low digits of year (00..99)
  1645.   * MM = month (01..12)
  1646.   * DD = day (01..31)
  1647. Remarks:
  1648.   * To set system date use function 22.
  1649.  
  1650. ======================================================================
  1651. ============= Function 30 - work with the current folder. ============
  1652. ======================================================================
  1653.  
  1654. --------- Subfunction 1 - set current folder for the thread. ---------
  1655. Parameters:
  1656.   * eax = 30 - function number
  1657.   * ebx = 1 - subfunction number
  1658.   * ecx = pointer to ASCIIZ-string with the path to new current folder
  1659. Returned value:
  1660.   * function does not return value
  1661.  
  1662. --------- Subfunction 2 - get current folder for the thread. ---------
  1663. Parameters:
  1664.   * eax = 30 - function number
  1665.   * ebx = 2 - subfunction number
  1666.   * ecx = pointer to buffer
  1667.   * edx = size of buffer
  1668. Returned value:
  1669.   * eax = size of the current folder's name (including terminating 0)
  1670. Remarks:
  1671.   * If the buffer is too small to hold all data, only first (edx-1)
  1672.     bytes are copied and than terminating 0 is inserted.
  1673.   * By default, current folder for the thread is "/rd/1".
  1674.   * At process/thread creation the current folder will be inherited
  1675.     from the parent.
  1676.  
  1677. ======================================================================
  1678. ======= Function 35 - read the color of a pixel on the screen. =======
  1679. ======================================================================
  1680. Parameters:
  1681.   * eax = 35
  1682.   * ebx = y*xsize+x, where
  1683.   * (x,y) = coordinates of a pixel (beginning from 0)
  1684.   * xsize = horizontal screen size
  1685. Returned value:
  1686.   * eax = color 0x00RRGGBB
  1687. Remarks:
  1688.   * To get screen sizes use function 14. Pay attention,
  1689.     that it subtracts 1 from both sizes.
  1690.   * There is also direct access (without any system calls)
  1691.     to videomemory through the selector gs. To get parameters of
  1692.     the current videomode, use function 61.
  1693.  
  1694. ======================================================================
  1695. =================== Function 36 - read screen area. ==================
  1696. ======================================================================
  1697. Paramters:
  1698.   * eax = 36 - function number
  1699.   * ebx = pointer to the previously allocated memory area,
  1700.         where will be placed the image in the format BBGGRRBBGGRR...
  1701.   * ecx = [size on axis x]*65536 + [size on axis y]
  1702.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1703. Returned value:
  1704.   * function does not return value
  1705. Remarks:
  1706.   * Coordinates of the image are coordinates of the upper left corner
  1707.     of the image relative to the screen.
  1708.   * Size of the image in bytes is 3*xsize*ysize.
  1709.  
  1710. ======================================================================
  1711. =================== Function 37 - work with mouse. ===================
  1712. ======================================================================
  1713.  
  1714. ---------- Subfunction 0 - screen coordinates of the mouse -----------
  1715. Parameters:
  1716.   * eax = 37 - function number
  1717.   * ebx = 0 - subfunction number
  1718. Returned value:
  1719.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1720.     (beginning from 0)
  1721.  
  1722. -- Subfunction 1 - coordinates of the mouse relative to the window ---
  1723. Parameters:
  1724.   * eax = 37 - function number
  1725.   * ebx = 1 - subfunction number
  1726. Returned value:
  1727.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1728.     relative to the application window (beginning from 0)
  1729. Remarks:
  1730.   * The value is calculated by formula (x-xwnd)*65536 + (y-ywnd).
  1731.     If y>=ywnd, the low word is non-negative and contains
  1732.     relative y-coordinate, and the high word - relative x-coordinate
  1733.     (with correct sign). Otherwise the low word is negative and still
  1734.     contains relative y-coordinate, and to the high word
  1735.     1 should be added.
  1736.  
  1737. ------------ Subfunction 2 - pressed buttons of the mouse ------------
  1738. Parameters:
  1739.   * eax = 37 - function number
  1740.   * ebx = 2 - subfunction number
  1741. Returned value:
  1742.   * eax contains information on the pressed mouse buttons:
  1743.   * bit 0 is set = left button is pressed
  1744.   * bit 1 is set = right button is pressed
  1745.   * bit 2 is set = middle button is pressed
  1746.   * bit 3 is set = 4th button is pressed
  1747.   * bit 4 is set = 5th button is pressed
  1748.   * other bits are cleared
  1749.  
  1750. -------------------- Subfunction 4 - load cursor ---------------------
  1751. Parameters:
  1752.   * eax = 37 - function number
  1753.   * ebx = 4 - subfunction number
  1754.   * dx = data source:
  1755.   * dx = LOAD_FROM_FILE = 0 - data in a file
  1756.     * ecx = pointer to full path to the cursor file
  1757.     * the file must be in the format .cur, which is standard for
  1758.       MS Windows, at that of the size 32*32 pixels
  1759.   * dx = LOAD_FROM_MEM = 1 - data of file are already loaded in memory
  1760.     * ecx = pointer to data of the cursor file
  1761.     * the data format is the same as in the previous case
  1762.   * dx = LOAD_INDIRECT = 2 - data in memory
  1763.     * ecx = pointer to cursor image in the format ARGB 32*32 pixels
  1764.     * edx = 0xXXYY0002, where
  1765.       * XX = x-coordinate of cursor hotspot
  1766.       * YY = y-coordinate
  1767.       * 0 <= XX, YY <= 31
  1768. Returned value:
  1769.   * eax = 0 - failed
  1770.   * otherwise eax = cursor handle
  1771.  
  1772. --------------------- Subfunction 5 - set cursor ---------------------
  1773. Sets new cursor for the window of the current thread.
  1774. Parameters:
  1775.   * eax = 37 - function number
  1776.   * ebx = 5 - subfunction number
  1777.   * ecx = cursor handle
  1778. Returned value:
  1779.   * eax = handle of previous cursor
  1780. Remarks:
  1781.   * If the handle is incorrect, the function restores the default
  1782.     cursor (standard arrow). In particular, ecx=0 restores it.
  1783.  
  1784. ------------------- Subfunction 6 - delete cursor --------------------
  1785. Parameters:
  1786.   * eax = 37 - function number
  1787.   * ebx = 6 - subfunction number
  1788.   * ecx = cursor handle
  1789. Returned value:
  1790.   * eax destroyed
  1791. Remarks:
  1792.   * The cursor must be loaded previously by the current thread
  1793.     (with the call to subfunction 4). The function does not delete
  1794.     system cursors and cursors, loaded by another applications.
  1795.   * If the active cursor (set by subfunction 5) is deleted,
  1796.     the system restores the default cursor (standard arrow).
  1797.  
  1798. ------------------ Subfunction 7 - get scroll data -------------------
  1799. Parameters:
  1800.   * eax = 37 - function number
  1801.   * ebx = 7 - subfunction number
  1802. Returned value:
  1803.   * eax = [horizontal offset]*65536 + [vertical offset]
  1804. Remarks:
  1805.   * Scroll data is available for active window only.
  1806.   * Values are zeroed after reading.
  1807.   * Values are signed.
  1808.  
  1809. ======================================================================
  1810. ====================== Function 38 - draw line. ======================
  1811. ======================================================================
  1812. Parameters:
  1813.   * eax = 38 - function number
  1814.   * ebx = [start coordinate on axis x]*65536 +
  1815.               [end coordinate on axis x]
  1816.   * ecx = [start coordinate on axis y]*65536 +
  1817.               [end coordinate on axis y]
  1818.   * edx = 0x00RRGGBB - color
  1819.     edx = 0x01xxxxxx - draw inversed line
  1820.           (low 24 bits are ignored)
  1821. Returned value:
  1822.   * function does not return value
  1823. Remarks:
  1824.   * Coordinates are relative to the window.
  1825.   * End point is also drawn.
  1826.  
  1827. ======================================================================
  1828. == Function 39, subfunction 1 - get a size of the background image. ==
  1829. ======================================================================
  1830. Parameters:
  1831.   * eax = 39 - function number
  1832.   * ebx = 1 - subfunction number
  1833. Returned value:
  1834.   * eax = [width]*65536 + [height]
  1835. Remarks:
  1836.   * There is a pair function to set sizes of background image -
  1837.     subfunction 1 of function 15. After which it is necessary,
  1838.     of course, anew to define image.
  1839.  
  1840. ======================================================================
  1841. == Function 39, subfunction 2 - get pixel from the background image. =
  1842. ======================================================================
  1843. Parameters:
  1844.   * eax = 39 - function number
  1845.   * ebx = 2 - subfunction number
  1846.   * ecx = offset
  1847. Returned value:
  1848.   * eax = 0x00RRGGBB - pixel color, if offset is valid
  1849.     (less than 0x160000-16)
  1850.   * eax = 2 otherwise
  1851. Remarks:
  1852.   * Do not rely on returned value for invalid offsets, it may be
  1853.     changed in future kernel versions.
  1854.   * Offset for pixel with coordinates (x,y)
  1855.     is calculated as (x+y*xsize)*3.
  1856.   * There is a pair function to set pixel on the background image -
  1857.     subfunction 2 of function 15.
  1858.  
  1859. ======================================================================
  1860. == Function 39, subfunction 4 - get drawing mode for the background. =
  1861. ======================================================================
  1862. Parameters:
  1863.   * eax = 39 - function number
  1864.   * ebx = 4 - subfunction number
  1865. Returned value:
  1866.   * eax = 1 - tile
  1867.   * eax = 2 - stretch
  1868. Remarks:
  1869.   * There is a pair function to set drawing mode -
  1870.     subfunction 4 of function 15.
  1871.  
  1872. ======================================================================
  1873. =========== Function 40 - set the mask for expected events. ==========
  1874. ======================================================================
  1875. The mask for expected events affects function working with events
  1876. 10, 11, 23 - they notify only about events allowed by this mask.
  1877. Parameters:
  1878.   * eax = 40 - function number
  1879.   * ebx = mask: bit i corresponds to event i+1 (see list of events)
  1880.     (set bit permits notice on event)
  1881. Returned value:
  1882.   * eax = previous value of mask
  1883. Remarks:
  1884.   * Default mask (7=111b) enables nofices about redraw,
  1885.     keys and buttons. This is enough for many applications.
  1886.   * Events prohibited in the mask are saved anyway, when come;
  1887.     they are simply not informed with event functions.
  1888.   * Event functions take into account the mask on moment of
  1889.     function call, not on moment of event arrival.
  1890.  
  1891.  
  1892. ======================================================================
  1893. ================ Function 43 - input/output to a port. ===============
  1894. ======================================================================
  1895.  
  1896. ------------------------ Output data to port -------------------------
  1897. Parameters:
  1898.   * eax = 43 - function number
  1899.   * bl = byte for output
  1900.   * ecx = port number 0xnnnn (from 0 to 0xFFFF)
  1901. Returned value:
  1902.   * eax = 0 - success
  1903.   * eax = 1 - the thread has not reserved the selected port
  1904.  
  1905. ------------------------ Input data from port ------------------------
  1906. Parameters:
  1907.   * eax = 43 - function number
  1908.   * ebx is ignored
  1909.   * ecx = 0x8000nnnn, where nnnn = port number (from 0 to 0xFFFF)
  1910. Returned value:
  1911.   * eax = 0 - success, thus ebx = entered byte
  1912.   * eax = 1 - the thread has not reserved the selected port
  1913. Remarks:
  1914.   * Previously the thread must reserve the selected port
  1915.     for itself by function 46.
  1916.   * Instead of call to this function it is better to use
  1917.     processor instructions in/out - this is much
  1918.     faster and a bit shorter and easier.
  1919.  
  1920.  
  1921. ======================================================================
  1922. ====== Function 46 - reserve/free a group of input/output ports. =====
  1923. ======================================================================
  1924. To work with reserved ports an application can access directly by
  1925. commands in/out (recommended way) and can use function 43
  1926. (not recommended way).
  1927. Parameters:
  1928.   * eax = 46 - function number
  1929.   * ebx = 0 - reserve, 1 - free
  1930.   * ecx = start port number
  1931.   * edx = end port number (inclusive)
  1932. Returned value:
  1933.   * eax = 0 - success
  1934.   * eax = 1 - error
  1935. Remarks:
  1936.   * For ports reservation: an error occurs if and only if
  1937.     one from the following condition satisfies:
  1938.     * start port is more than end port;
  1939.     * the selected range contains incorrect port number
  1940.       (correct are from 0 to 0xFFFF);
  1941.     * limit for the total number of reserved areas is exceeded
  1942.       (maximum 255 are allowed);
  1943.     * the selected range intersects with any of earlier reserved
  1944.   * For ports free: an error is an attempt to free range,
  1945.     that was not earlier reserved by this function
  1946.     (with same ecx,edx).
  1947.   * If an error occurs (for both cases) function performs no action.
  1948.   * At booting the system reserves for itself ports
  1949.     0..0x2d, 0x30..0x4d, 0x50..0xdf, 0xe5..0xff (inclusively).
  1950.   * When a thread terminates, all reserved by it ports
  1951.     are freed automatically.
  1952.  
  1953. ======================================================================
  1954. ============= Function 47 - draw a number in the window. =============
  1955. ======================================================================
  1956. Parameters:
  1957.   * eax = 47 - function number
  1958.   * ebx = parameters of conversion number to text:
  1959.     * bl = 0 - ecx contains number
  1960.     * bl = 1 - ecx contains pointer to dword/qword-number
  1961.     * bh = 0 - display in decimal number system
  1962.     * bh = 1 - display in hexadecimal system
  1963.     * bh = 2 - display in binary system
  1964.     * bits 16-21 = how many digits to display
  1965.     * bits 22-29 reserved and must be set to 0
  1966.     * bit 30 set = display qword (64-bit) number (must be bl=1)
  1967.     * bit 31 set = do not display leading zeroes of the number
  1968.   * ecx = number (if bl=0) or pointer (if bl=1)
  1969.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1970.   * esi = 0xX0RRGGBB:
  1971.     * RR, GG, BB specify the color
  1972.     * X = ABnn (bits)
  1973.     * nn = font (0/1)
  1974.     * A is ignored
  1975.     * B=1 - fill background with the color edi
  1976. Returned value:
  1977.   * function does not return value
  1978. Remarks:
  1979.   * The given length must not exceed 60.
  1980.   * The exactly given amount of digits is output. If number is small
  1981.     and can be written by smaller amount of digits, it is supplemented
  1982.     by leading zeroes; if the number is big and can not be written by
  1983.     given amount of digits, extra digits are not drawn.
  1984.   * Parameters of fonts are shown in the description of function 4
  1985.     (text output).
  1986.  
  1987. ======================================================================
  1988. ========= Function 48, subfunction 0 - apply screen settings. ========
  1989. ======================================================================
  1990. Parameters:
  1991.   * eax = 48 - function number
  1992.   * ebx = 0 - subfunction number
  1993.   * ecx = 0 - reserved
  1994. Returned value:
  1995.   * function does not return value
  1996. Remarks:
  1997.   * Function redraws the screen after parameters change by
  1998.     subfunctions 1 and 2.
  1999.   * Function call without prior call to one of indicated subfunctions
  2000.     is ignored.
  2001.   * Function call with nonzero ecx is ignored.
  2002.  
  2003. ======================================================================
  2004. =========== Function 48, subfunction 1 - set button style. ===========
  2005. ======================================================================
  2006. Parameters:
  2007.   * eax = 48 - function number
  2008.   * ebx = 1 - subfunction number
  2009.   * ecx = button style:
  2010.     * 0 = flat
  2011.     * 1 = 3d
  2012. Returned value:
  2013.   * function does not return value
  2014. Remarks:
  2015.   * After call to this function one should redraw the screen by
  2016.     subfunction 0.
  2017.   * Button style influences only to their draw of function 8.
  2018.  
  2019. ======================================================================
  2020. ====== Function 48, subfunction 2 - set standard window colors. ======
  2021. ======================================================================
  2022. Parameters:
  2023.   * eax = 48 - function number
  2024.   * ebx = 2 - subfunction number
  2025.   * ecx = pointer to the color table
  2026.   * edx = size of the color table
  2027.     (must be 40 bytes for future compatibility)
  2028. Format of the color table is shown in description of subfunction 3.
  2029. Returned value:
  2030.   * function does not return value
  2031. Remarks:
  2032.   * After call to this function one should redraw the screen by
  2033.     subfunction 0.
  2034.   * Table of standard colors influences only to applications,
  2035.     which receive this table obviously (by subfunction 3)
  2036.     and use it (specifying colors from it to drawing functions).
  2037.   * Table of standard colors is included in skin and is installed
  2038.     anew with skin installation (by subfunction 8).
  2039.   * Color table can be viewed/changed interactively with
  2040.     the application 'desktop'.
  2041.  
  2042. ======================================================================
  2043. ====== Function 48, subfunction 3 - get standard window colors. ======
  2044. ======================================================================
  2045. Parameters:
  2046.   * eax = 48 - function number
  2047.   * ebx = 3 - subfunction number
  2048.   * ecx = pointer to the buffer with size edx bytes,
  2049.     where table will be written
  2050.   * edx = size of color table
  2051.     (must be 40 bytes for future compatibility)
  2052. Returned value:
  2053.   * function does not return value
  2054. Format of the color table:
  2055. each item is dword-value for color 0x00RRGGBB
  2056.   * +0: dword: frames - color of frame
  2057.   * +4: dword: grab - color of header
  2058.   * +8: dword: grab_button - color of button on header bar
  2059.   * +12 = +0xC: dword: grab_button_text - color of text on button
  2060.     on header bar
  2061.   * +16 = +0x10: dword: grab_text - color of text on header
  2062.   * +20 = +0x14: dword: work - color of working area
  2063.   * +24 = +0x18: dword: work_button - color of button in working area
  2064.   * +28 = +0x1C: dword: work_button_text - color of text on button
  2065.     in working area
  2066.   * +32 = +0x20: dword: work_text - color of text in working area
  2067.   * +36 = +0x24: dword: work_graph - color of graphics in working area
  2068. Remarks:
  2069.   * Structure of the color table is described in the standard
  2070.     include file 'macros.inc' as 'system_colors'; for example,
  2071.     it is possible to write:
  2072.         sc      system_colors           ; variable declaration
  2073.         ...                             ; somewhere one must call
  2074.                                         ; this function with ecx=sc
  2075.         mov     ecx, [sc.work_button_text]      ; read text color on
  2076.                                         ; buttin in working area
  2077.   * A program itself desides to use or not to use color table.
  2078.     For usage program must simply at calls to drawing functions select
  2079.     color taken from the table.
  2080.   * At change of the table of standard colors (by subfunction 2 with
  2081.     the subsequent application of changes by subfunction 0 or
  2082.     at skin set by subfunction 8) the system sends to all windows
  2083.     redraw message (the event with code 1).
  2084.   * Color table can be viewed/changed interactively with
  2085.     the application 'desktop'.
  2086.  
  2087. ======================================================================
  2088. ============ Function 48, subfunction 4 - get skin height. ===========
  2089. ======================================================================
  2090. Parameters:
  2091.   * eax = 48 - function number
  2092.   * ebx = 4 - subfunction number
  2093. Returned value:
  2094.   * eax = skin height
  2095. Remarks:
  2096.   * Skin height is defined as the height of a header
  2097.     of skinned windows.
  2098.   * See also general structure of window in the description
  2099.     of function 0.
  2100.  
  2101. ======================================================================
  2102. ======== Function 48, subfunction 5 - get screen working area. =======
  2103. ======================================================================
  2104. Parameters:
  2105.   * eax = 48 - function number
  2106.   * ebx = 5 - subfunction number
  2107. Returned value:
  2108.   * eax = [left]*65536 + [right]
  2109.   * ebx = [top]*65536 + [bottom]
  2110. Remarks:
  2111.   * The screen working area defines position and coordinates of
  2112.     a maximized window.
  2113.   * The screen working area in view of normal work is all screen
  2114.     without system panel (the application '@panel').
  2115.   * (left,top) are coordinates of the left upper corner,
  2116.     (right,bottom) are coordinates of the right lower one.
  2117.     Thus the size of working area on x axis can be calculated by
  2118.     formula right-left+1, on y axis - by formula bottom-right+1.
  2119.   * See also function 14,
  2120.     to get sizes of all screen.
  2121.   * There is a pair function to set working area - subfunction 6.
  2122.  
  2123. ======================================================================
  2124. ======== Function 48, subfunction 6 - set screen working area. =======
  2125. ======================================================================
  2126. Parameters:
  2127.   * eax = 48 - function number
  2128.   * ebx = 6 - subfunction number
  2129.   * ecx = [left]*65536 + [right]
  2130.   * edx = [top]*65536 + [bottom]
  2131. Returned value:
  2132.   * function does not return value
  2133. Remarks:
  2134.   * The screen working area defines position and coordinates of
  2135.     a maximized window.
  2136.   * This function is used only by the application '@panel',
  2137.     which set working area to all screen without system panel.
  2138.   * (left,top) are coordinates of the left upper corner,
  2139.     (right,bottom) are coordinates of the right lower one.
  2140.     Thus the size of working area on x axis can be calculated by
  2141.     formula right-left+1, on y axis - by formula bottom-right+1.
  2142.   * If 'left'>='right', x-coordinate of working area is not changed.
  2143.     If 'left'<0, 'left' will not be set. If 'right' is greater than or
  2144.     equal to screen width, 'right' will not be set.
  2145.     Similarly on y axis.
  2146.   * See also function 14,
  2147.     to get sizes of all screen.
  2148.   * There is a pair function to get working area - subfunction 5.
  2149.   * This function redraws the screen automatically,
  2150.     updating coordinates and sizes of maximized windows.
  2151.     The system sends to all windows redraw message (the event 1).
  2152.  
  2153. ======================================================================
  2154. =========== Function 48, subfunction 7 - get skin margins. ===========
  2155. ======================================================================
  2156. Returns the area of a header of a skinned window, intended for
  2157. a text of a header.
  2158. Parameters:
  2159.   * eax = 48 - function number
  2160.   * ebx = 7 - subfunction number
  2161. Returned value:
  2162.   * eax = [left]*65536 + [right]
  2163.   * ebx = [top]*65536 + [bottom]
  2164. Remarks:
  2165.   * An application decides itself to use or not to use this function.
  2166.   * It is recommended to take into account returned value
  2167.     of this function for choice of a place for drawing header text
  2168.     (by function 4) or a substitute of header text
  2169.     (at the discretion of an application).
  2170.  
  2171. ======================================================================
  2172. ============= Function 48, subfunction 8 - set used skin. ============
  2173. ======================================================================
  2174. Parameters:
  2175.   * eax = 48 - function number
  2176.   * ebx = 8 - subfunction number
  2177.   * ecx = pointer to a block for function 58, in
  2178.     which the fields of intermediate buffer and file name are filled
  2179. Returned value:
  2180.   * eax = 0 - success
  2181.   * otherwise eax = file system error code; if file does not
  2182.     contain valid skin, function returns error 3
  2183.     (unknown file system).
  2184. Remarks:
  2185.   * After successful skin loading the system sends to all windows
  2186.     redraw message (the event 1).
  2187.   * At booting the system reads skin from file 'default.skn'
  2188.     on ramdisk.
  2189.   * User can change the skin statically by creating hisself
  2190.     'default.skn' or dynamically with the application 'desktop'.
  2191.  
  2192. ======================================================================
  2193. =========== Function 49 - Advanced Power Management (APM). ===========
  2194. ======================================================================
  2195. Parameters:
  2196.   * eax = 49 - function number
  2197.   * dx = number of the APM function
  2198.     (analogue of ax in APM specification)
  2199.   * bx, cx = parameters of the APM function
  2200. Returned value:
  2201.   * 16-bit registers ax, bx, cx, dx, si, di and carry flag CF
  2202.     are set according to the APM specification
  2203.   * high halves of 32-bit registers eax, ebx, ecx,
  2204.     edx, esi, edi are destroyed
  2205. Remarks:
  2206.   * APM 1.2 specification is described in the document
  2207.     "Advanced Power Management (APM) BIOS Specification"
  2208.     (Revision 1.2), available at
  2209.     http://www.microsoft.com/whdc/archive/amp_12.mspx;
  2210.     besides it is included in famous Interrupt List by Ralf Brown
  2211.     (http://www.pobox.com/~ralf/files.html,
  2212.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/).
  2213.  
  2214. ======================================================================
  2215. =================== Function 50 - set window shape. ==================
  2216. ======================================================================
  2217. Normal windows have rectangular shape. This function can give to
  2218. a window any shape. The shape is given by a set of points inside
  2219. the base rectangle belonging to a window. Position and coordinates
  2220. of the base rectangle are set by function 0
  2221. and changed by function 67.
  2222.  
  2223. --------------------------- Set shape data ---------------------------
  2224. Parameters:
  2225.   * eax = 50 - function number
  2226.   * ebx = 0 - subfunction number
  2227.   * ecx = pointer to shape data (array of bytes 0/1)
  2228. Returned value:
  2229.   * function does not return value
  2230.  
  2231. -------------------------- Set shape scale ---------------------------
  2232. Parameters:
  2233.   * eax = 50 - function number
  2234.   * ebx = 1 - subfunction number
  2235.   * ecx sets a scale: each byte of data defines
  2236.     (2^scale)*(2^scale) pixels
  2237. Returned value:
  2238.   * function does not return value
  2239. Remarks:
  2240.   * Default scale is 0 (scale factor is 1). If in the shape data
  2241.     one byte corresponds to one pixel, there is no necessity
  2242.     to set scale.
  2243.   * Let's designate xsize = window width (in pixels), ysize = height;
  2244.     pay attention, that they are one pixel more than defined by
  2245.     functions 0, 67.
  2246.   * On definition of scale xsize and ysize must be divisible
  2247.     on 2^scale.
  2248.   * Byte of data on offset 'a' must be 0/1 and defines belonging
  2249.     to a window of square with the side 2^scale (if scale=0,
  2250.     this is one pixel) and coordinates of the left upper corner
  2251.     (a mod (xsize shr scale), a div (xsize shr scale))
  2252.   * Data size: (xsize shr scale)*(ysize shr scale).
  2253.   * Data must be presented in the memory and not change
  2254.     after set of shape.
  2255.   * The system views the shape data at every window redraw by
  2256.     function 0.
  2257.   * The call of subfunction 0 with NULL pointer results in return
  2258.     to the rectangular shape.
  2259.  
  2260. ======================================================================
  2261. ==================== Function 51 - create thread. ====================
  2262. ======================================================================
  2263. Parameters:
  2264.   * eax = 51 - function number
  2265.   * ebx = 1 - unique subfunction
  2266.   * ecx = address of thread entry point (starting eip)
  2267.   * edx = pointer to thread stack (starting esp)
  2268. Returned value:
  2269.   * eax = -1 - error (there is too many threads)
  2270.   * otherwise eax = TID - thread identifier
  2271.     </UL>    
  2272.  
  2273. ======================================================================
  2274. === Function 52, subfunction 0 - get network driver configuration. ===
  2275. ======================================================================
  2276. Parameters:
  2277.   * eax = 52 - function number
  2278.   * ebx = 0 - subfunction number
  2279. Returned value:
  2280.   * eax = configuration dword
  2281. Remarks:
  2282.   * Configuration dword can be set by subfunction 2.
  2283.   * The kernel does not use this variable. The value of this
  2284.     variable and working with it subfunctions 0 and 2 is represented
  2285.     doubtful.
  2286.  
  2287. ======================================================================
  2288. ========= Function 52, subfunction 1 - get local IP-address. =========
  2289. ======================================================================
  2290. Parameters:
  2291.   * eax = 52 - function number
  2292.   * ebx = 1 - subfunction number
  2293. Returned value:
  2294.   * eax = IP-address (4 bytes)
  2295. Remarks:
  2296.   * Local IP-address is set by subfunction 3.
  2297.  
  2298. ======================================================================
  2299. === Function 52, subfunction 2 - set network driver configuration. ===
  2300. ======================================================================
  2301. Parameters:
  2302.   * eax = 52 - function number
  2303.   * ebx = 2 - subfunction number
  2304.   * ecx = configuration dword; if low 7 bits derivate the number 3,
  2305.     function [re-]initializes Ethernet-card, otherwise
  2306.     Ethernet turns off
  2307. Returned value:
  2308.   * if Ethernet-interface is not requested, function returns eax=2,
  2309.     but this can be changed in future kernel versions
  2310.   * if Ethernet-interface is requested, eax=0 means error
  2311.     (absence of Ethernet-card), and nonzero value - success
  2312. Remarks:
  2313.   * Configuration dword can be read by subfunction 0.
  2314.   * The kernel does not use this variable. The value of this
  2315.     variable, subfunction 0 and part of subfunction 2, which set it,
  2316.     is represented doubtful.
  2317.  
  2318. ======================================================================
  2319. ========= Function 52, subfunction 3 - set local IP-address. =========
  2320. ======================================================================
  2321. Parameters:
  2322.   * eax = 52 - function number
  2323.   * ebx = 3 - subfunction number
  2324.   * ecx = IP-address (4 bytes)
  2325. Returned value:
  2326.   * the current implementation returns eax=3, but this can be changed
  2327.     in future versions
  2328. Remarks:
  2329.   * Local IP-address can be get by subfunction 1.
  2330.  
  2331. ======================================================================
  2332. = Function 52, subfunction 6 - add data to the stack of input queue. =
  2333. ======================================================================
  2334. Parameters:
  2335.   * eax = 52 - function number
  2336.   * ebx = 6 - subfunction number
  2337.   * edx = data size
  2338.   * esi = data pointer
  2339. Returned value:
  2340.   * eax = -1 - error
  2341.   * eax = 0 - success
  2342. Remarks:
  2343.   * This function is intended only for slow network drivers
  2344.     (PPP, SLIP).
  2345.   * Data size must not exceed 1500 bytes, though function
  2346.     performs no checks on correctness.
  2347.  
  2348. ======================================================================
  2349.  Function 52, subfunction 8 - read data from the network output queue.
  2350. ======================================================================
  2351. Parameters:
  2352.   * eax = 52 - function number
  2353.   * ebx = 8 - subfunction number
  2354.   * esi = pointer to 1500-byte buffer
  2355. Returned value:
  2356.   * eax = number of read bytes (in the current implementation
  2357.     either 0 = no data or 1500)
  2358.   * data was copied in buffer
  2359. Remarks:
  2360.   * This function is intended only for slow network drivers
  2361.     (PPP, SLIP).
  2362.  
  2363. ======================================================================
  2364. ============ Function 52, subfunction 9 - get gateway IP. ============
  2365. ======================================================================
  2366. Parameters:
  2367.   * eax = 52 - function number
  2368.   * ebx = 9 - subfunction number
  2369. Returned value:
  2370.   * eax = gateway IP (4 bytes)
  2371.  
  2372. ======================================================================
  2373. =========== Function 52, subfunction 10 - get subnet mask. ===========
  2374. ======================================================================
  2375. Parameters:
  2376.   * eax = 52 - function number
  2377.   * ebx = 10 - subfunction number
  2378. Returned value:
  2379.   * eax = subnet mask
  2380.  
  2381. ======================================================================
  2382. ============ Function 52, subfunction 11 - set gateway IP. ===========
  2383. ======================================================================
  2384. Parameters:
  2385.   * eax = 52 - function number
  2386.   * ebx = 11 - subfunction number
  2387.   * ecx = gateway IP (4 bytes)
  2388. Returned value:
  2389.   * the current implementation returns eax=11, but this can be changed
  2390.     in future versions
  2391.  
  2392. ======================================================================
  2393. =========== Function 52, subfunction 12 - set subnet mask. ===========
  2394. ======================================================================
  2395. Parameters:
  2396.   * eax = 52 - function number
  2397.   * ebx = 12 - subfunction number
  2398.   * ecx = subnet mask
  2399. Returned value:
  2400.   * the current implementation returns eax=12, but this can be changed
  2401.     in future versions
  2402.  
  2403. ======================================================================
  2404. ============== Function 52, subfunction 13 - get DNS IP. =============
  2405. ======================================================================
  2406. Parameters:
  2407.   * eax = 52 - function number
  2408.   * ebx = 13 - subfunction number
  2409. Returned value:
  2410.   * eax = DNS IP (4 bytes)
  2411.  
  2412. ======================================================================
  2413. ============== Function 52, subfunction 14 - set DNS IP. =============
  2414. ======================================================================
  2415. Parameters:
  2416.   * eax = 52 - function number
  2417.   * ebx = 14 - subfunction number
  2418.   * ecx = DNS IP (4 bytes)
  2419. Returned value:
  2420.   * the current implementation returns eax=14, but this can be changed
  2421.     in future versions
  2422.  
  2423. ======================================================================
  2424. ======== Function 52, subfunction 15 - get local MAC address. ========
  2425. ======================================================================
  2426. Parameters:
  2427.   * eax = 52 - function number
  2428.   * ebx = 15 - subfunction number
  2429.   * ecx = 0 - read first 4 bytes,
  2430.     ecx = 4 - read last 2 bytes
  2431. Returned value:
  2432.   * for ecx=0: eax = first 4 bytes of MAC address
  2433.   * for ecx=4: ax = last 2 bytes of MAC address,
  2434.                high half of eax is destroyed
  2435.   * for other ecx: eax = -1 indicates an error
  2436.  
  2437. ======================================================================
  2438. ============ Function 53, subfunction 0 - open UDP-socket. ===========
  2439. ======================================================================
  2440. Parameters:
  2441.   * eax = 53 - function number
  2442.   * ebx = 0 - subfunction number
  2443.   * ecx = local port (only low word is taken into account),
  2444.     ecx = 0 - let the system choose a port
  2445.   * edx = remote port (only low word is taken into account)
  2446.   * esi = remote IP
  2447. Returned value:
  2448.   * eax = -1 = 0xFFFFFFFF - error; ebx destroyed
  2449.   * eax = socket handle (some number which unambiguously identifies
  2450.     socket and have sense only for the system) - success;
  2451.     ebx destroyed
  2452.  
  2453. ======================================================================
  2454. =========== Function 53, subfunction 1 - close UDP-socket. ===========
  2455. ======================================================================
  2456. Parameters:
  2457.   * eax = 53 - function number
  2458.   * ebx = 1 - subfunction number
  2459.   * ecx = socket handle
  2460. Returned value:
  2461.   * eax = -1 - incorrect handle
  2462.   * eax = 0 - success
  2463.   * ebx destroyed
  2464. Remarks:
  2465.   * The current implementation does not close automatically all
  2466.     sockets of a thread at termination. In particular, one should not
  2467.     kill a thread with many opened sockets - there will be an outflow
  2468.     of resources.
  2469.  
  2470. ======================================================================
  2471. ============== Function 53, subfunction 2 - poll socket. =============
  2472. ======================================================================
  2473. Parameters:
  2474.   * eax = 53 - function number
  2475.   * ebx = 2 - subfunction number
  2476.   * ecx = socket handle
  2477. Returned value:
  2478.   * eax = number of read bytes, 0 for incorrect handle
  2479.   * ebx destroyed
  2480.  
  2481. ======================================================================
  2482. ========= Function 53, subfunction 3 - read byte from socket. ========
  2483. ======================================================================
  2484. Parameters:
  2485.   * eax = 53 - function number
  2486.   * ebx = 3 - subfunction number
  2487.   * ecx = socket handle
  2488. Returned value:
  2489.   * if there is no read data or handle is incorrect: eax=0, bl=0,
  2490.     other bytes of ebx are destroyed
  2491.   * if there are read data: eax=number of rest bytes
  2492.     (possibly 0), bl=read byte, other bytes of ebx are destroyed
  2493.  
  2494. ======================================================================
  2495. ========== Function 53, subfunction 4 - write to UDP-socket. =========
  2496. ======================================================================
  2497. Parameters:
  2498.   * eax = 53 - function number
  2499.   * ebx = 4 - subfunction number
  2500.   * ecx = socket handle
  2501.   * edx = number of bytes to write
  2502.   * esi = pointer to data to write
  2503. Returned value:
  2504.   * eax = 0xffffffff - error (invalid handle or not enough memory)
  2505.   * eax = 0 - success
  2506.   * ebx destroyed
  2507. Remarks:
  2508.   * Number of bytes to write must not exceed 1500-28, though
  2509.     the appropriate check is not made.
  2510.  
  2511. ======================================================================
  2512. ============ Function 53, subfunction 5 - open TCP-socket. ===========
  2513. ======================================================================
  2514. Parameters:
  2515.   * eax = 53 - function number
  2516.   * ebx = 5 - subfunction number
  2517.   * ecx = local port (only low word is taken into account),
  2518.     ecx = 0 - let the system choose a port
  2519.   * edx = remote port (only low word is taken into account)
  2520.   * esi = remote IP
  2521.   * edi = open mode: SOCKET_PASSIVE=0 or SOCKET_ACTIVE=1
  2522. Returned value:
  2523.   * eax = -1 = 0xFFFFFFFF - error; ebx destroys
  2524.   * eax = socket handle (some number which unambiguously identifies
  2525.     socket and have sense only for the system) - success;
  2526.     ebx destroyed
  2527.  
  2528. ======================================================================
  2529. ========= Function 53, subfunction 6 - get TCP-socket status. ========
  2530. ======================================================================
  2531. Parameters:
  2532.   * eax = 53 - function number
  2533.   * ebx = 6 - subfunction number
  2534.   * ecx = socket handle
  2535. Returned value:
  2536.   * eax = 0 for incorrect handle or socket status: one of
  2537.   * TCB_LISTEN = 1
  2538.   * TCB_SYN_SENT = 2
  2539.   * TCB_SYN_RECEIVED = 3
  2540.   * TCB_ESTABLISHED = 4
  2541.   * TCB_FIN_WAIT_1 = 5
  2542.   * TCB_FIN_WAIT_2 = 6
  2543.   * TCB_CLOSE_WAIT = 7
  2544.   * TCB_CLOSING = 8
  2545.   * TCB_LAST_ASK = 9
  2546.   * TCB_TIME_WAIT = 10
  2547.   * TCB_CLOSED = 11
  2548.   * ebx destroyed
  2549.  
  2550. ======================================================================
  2551. ========== Function 53, subfunction 7 - write to TCP-socket. =========
  2552. ======================================================================
  2553. Parameters:
  2554.   * eax = 53 - function number
  2555.   * ebx = 7 - subfunction number
  2556.   * ecx = socket handle
  2557.   * edx = number of bytes to write
  2558.   * esi = pointer to data to write
  2559. Returned value:
  2560.   * eax = 0xffffffff - error (invalid handle or not enough memory)
  2561.   * eax = 0 - success
  2562.   * ebx destroyed
  2563. Remarks:
  2564.   * Number of bytes to write must not exceed 1500-40, though
  2565.     the appropriate check is not made.
  2566.  
  2567. ======================================================================
  2568. =========== Function 53, subfunction 8 - close TCP-socket. ===========
  2569. ======================================================================
  2570. Parameters:
  2571.   * eax = 53 - function number
  2572.   * ebx = 8 - subfunction number
  2573.   * ecx = socket handle
  2574. Returned value:
  2575.   * eax = -1 - error (invalid handle or
  2576.     not enough memory for socket close packet)
  2577.   * eax = 0 - success
  2578.   * ebx destroyed
  2579. Remarks:
  2580.   * The current implementation does not close automatically all
  2581.     sockets of a thread at termination. In particular, one should not
  2582.     kill a thread with many opened sockets - there will be an outflow
  2583.     of resources.
  2584.  
  2585. ======================================================================
  2586. === Function 53, subfunction 9 - check whether local port is free. ===
  2587. ======================================================================
  2588. Parameters:
  2589.   * eax = 53 - function number
  2590.   * ebx = 9 - subfunction number
  2591.   * ecx = local port number (low 16 bits are used only)
  2592. Returned value:
  2593.   * eax = 0 - port is used
  2594.   * eax = 1 - port is free
  2595.   * ebx destroyed
  2596.  
  2597. ======================================================================
  2598. ===== Function 53, subfunction 10 - query Ethernet cable status. =====
  2599. ======================================================================
  2600. Parameters:
  2601.   * eax = 53 - function number
  2602.   * ebx = 10 - subfunction number
  2603. Returned value:
  2604.   * al = -1 - a network driver is not loaded or
  2605.               does not support this function
  2606.   * al = 0 - Ethernet cable is unplugged
  2607.   * al = 1 - Ethernet cable is plugged
  2608.   * ebx destroyed
  2609. Remarks:
  2610.   * The current kernel implementation supports this function
  2611.     only for RTL8139 network cards.
  2612.  
  2613. ======================================================================
  2614. ======= Function 53, subfunction 11 - read network stack data. =======
  2615. ======================================================================
  2616. Paramters:
  2617.   * eax = 53 - function number
  2618.   * ebx = 11 - subfunction number
  2619.   * ecx = socket handle
  2620.   * edx = pointer to buffer
  2621.   * esi = number of bytes to read;
  2622.   * esi = 0 - read all data (maximum 4096 bytes)
  2623. Returned value:
  2624.   * eax = number of bytes read (0 for incorrect handle)
  2625.   * ebx destroyed
  2626.  
  2627. ======================================================================
  2628. = Function 53, subfunction 255 - debug information of network driver.
  2629. ======================================================================
  2630. Parameters:
  2631.   * eax = 53 - function number
  2632.   * ebx = 255 - subfunction number
  2633.   * ecx = type of requested information (see below)
  2634. Returned value:
  2635.   * eax = requested information
  2636.   * ebx destroyed
  2637. Possible values for ecx:
  2638.   * 100: length of queue 0 (empty queue)
  2639.   * 101: length of queue 1 (ip-out queue)
  2640.   * 102: length of queue 2 (ip-in queue)
  2641.   * 103: length of queue 3 (net1out queue)
  2642.   * 200: number of items in the ARP table
  2643.   * 201: size of the ARP table (in items) (20 for current version)
  2644.   * 202: read item at edx of the ARP table to the temporary buffer,
  2645.     whence 5 following types take information;
  2646.     in this case eax is not defined
  2647.   * 203: IP-address saved by type 202
  2648.   * 204: high dword of MAC-address saved by type 202
  2649.   * 205: low word of MAC-address saved by type 202
  2650.   * 206: status word saved by type 202
  2651.   * 207: ttl word saved by type 202
  2652.   * 2: total number of received IP-packets
  2653.   * 3: total number of transferred IP-packets
  2654.   * 4: total number of dumped received packets
  2655.   * 5: total number of received ARP-packets
  2656.   * 6: status of packet driver, 0=inactive, nonzero=active
  2657.  
  2658. ======================================================================
  2659.  Function 55, subfunction 55 - begin to play data on built-in speaker.
  2660. ======================================================================
  2661. Parameters:
  2662.   * eax = 55 - function number
  2663.   * ebx = 55 - subfunction number
  2664.   * esi = pointer to data
  2665. Returned value:
  2666.   * eax = 0 - success
  2667.   * eax = 55 - error (speaker is off or busy)
  2668. Data is an array of items with variable length.
  2669. Format of each item is defined by first byte:
  2670.   * 0 = end of data
  2671.   * 1..0x80 = sets sound duration on 1/100 of second; sound note
  2672.     is defined by immediate value of frequency
  2673.     * following word (2 bytes) contains frequency divider;
  2674.       frequency is defined as 1193180/divider
  2675.   * 0x81 = invalid
  2676.   * 0x82..0xFF = note is defined by octave and number:
  2677.     * duration in 1/100 of second = (first byte)-0x81
  2678.     * there is one more byte;
  2679.     * (second byte)=0xFF - delay
  2680.     * otherwise it looks like a*0x10+b, where b=number of the note in
  2681.       an octave from 1 to 12, a=number of octave (beginning from 0)
  2682. Remarks:
  2683.   * Speaker play can be disabled/enabled by
  2684.     subfunction 8 of function 18.
  2685.   * Function returns control, having informed the system
  2686.     an information on request. Play itself goes independently from
  2687.     the program.
  2688.   * The data must be kept in the memory at least up to the end
  2689.     of play.
  2690.  
  2691. ======================================================================
  2692. ======================= Function 57 - PCI BIOS. ======================
  2693. ======================================================================
  2694. Parameters:
  2695.   * eax = 57 - function number
  2696.   * ebp corresponds to al in PCI BIOS specification
  2697.   * other registers are set according to PCI BIOS specification
  2698. Returned value:
  2699.   * CF is undefined
  2700.   * other registers are set according to PCI BIOS specification
  2701. Remarks:
  2702.   * Many effects of this function can be also achieved with
  2703.     corresponding subfunctions of function 62.
  2704.   * The function calls PCI32 BIOS extension, documented e.g. in
  2705.     http://alpha1.dyns.net/files/PCI/bios21.pdf.
  2706.   * If BIOS does not support this extension, its behavior is emulated
  2707.     (through kernel-mode analogues of subfunctions of function 62).
  2708.  
  2709. ======================================================================
  2710. ================ Function 58 - work with file system. ================
  2711. ======================================================================
  2712. Parameters:
  2713.   * eax = 58
  2714.   * ebx = pointer to the information structure
  2715. Returned value:
  2716.   * eax = 0 - success; otherwise file system error code
  2717.   * some subfunctions return value in other registers too
  2718. General format of the information structure:
  2719.   * +0: dword: subfunction number
  2720.   * +4: dword: number of block
  2721.   * +8: dword: size
  2722.   * +12 = +0xC: dword: pointer to data
  2723.   * +16 = +0x10: dword: pointer to a memory for system operations
  2724.     (4096 bytes)
  2725.   * +20 = +0x14: n db: ASCIIZ-string with the file name
  2726. Specifications - in documentation on the appropriate subfunction.
  2727. Filename is case-insensitive for latin letters, russian letters
  2728. must be capital.
  2729. Format of filename:
  2730. /base/number/dir1/dir2/.../dirn/file,
  2731. where /base/number identifies device, on which file is located:
  2732. one of
  2733.   * /RD/1 = /RAMDISK/1 to access ramdisk
  2734.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  2735.     /FD/2 = /FLOPPYDISK/2 to access second one
  2736.   * /HD/x = /HARDDISK/x - obsolete variant of access to hard disk
  2737.     (in this case base is defined by subfunction 7 of function 21),
  2738.     x - partition number (beginning from 1)
  2739.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  2740.     IDE0 (Primary Master), IDE1 (Primary Slave),
  2741.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  2742.     x - partition number on the selected hard drive, varies from 1
  2743.     to 255 (on each hard drive the indexing starts from 1)
  2744. Remarks:
  2745.   * In the first two cases it is also possible to use FIRST
  2746.     instead of 1, SECOND instead of 2, but it is not recommended
  2747.     for convenience of transition to the future extensions.
  2748.   * Limitation n<=39 is imposed.
  2749.   * Names of folders and file dir1,...,dirn,file must have the
  2750.     format 8.3: name no more than 8 characters, dot, extension no
  2751.     more than 3 characters. Trailing spaces are ignored, no other
  2752.     spaces is allowed. If name occupies equally 8 characters,
  2753.     dot may be omitted (though it is not recommended to use this
  2754.     feature for convenience of transition to the future extensions).
  2755.   * This function does not support folders on ramdisk.
  2756. Examples:
  2757.   * '/RAMDISK/FIRST/KERNEL.ASM',0
  2758.     '/rd/1/kernel.asm',0
  2759.   * '/HD0/1/kernel.asm',0
  2760.   * '/hd0/1/menuet/pics/tanzania.bmp',0
  2761. Existing subfunctions:
  2762.   * subfunction 0 - read file/folder
  2763.   * subfunction 8 - LBA-read from device
  2764.   * subfunction 15 - get file system information
  2765.  
  2766. ======================================================================
  2767. =========== Function 58, subfunction 0 - read file/folder. ===========
  2768. ======================================================================
  2769. Parameters:
  2770.   * eax = 58
  2771.   * ebx = pointer to the information structure
  2772. Format of the information structure:
  2773.   * +0: dword: 0 = subfunction number
  2774.   * +4: dword: first block to read (beginning from 0)
  2775.   * +8: dword: amount of blocks to read
  2776.   * +12 = +0xC: dword: pointer to buffer for data
  2777.   * +16 = +0x10: dword: pointer to buffer for system operations
  2778.     (4096 bytes)
  2779.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2780.     given in the general description
  2781. Returned value:
  2782.   * eax = 0 - success, otherwise file system error code
  2783.   * ebx = file size (in bytes) or -1=0xffffffff, if file was not found
  2784. Remarks:
  2785.   * Block size is 512 bytes.
  2786.   * This function is obsolete, for reading files use subfunction 0
  2787.     of function 70, for reading folders - subfunction 1 of
  2788.     function 70.
  2789.   * Function can read contents of a folder. Only FAT file system is
  2790.     supported. The format of FAT-folder is described
  2791.     in any FAT documentation.
  2792.   * Size of a folder is determined by size of FAT clusters chain.
  2793.   * If file was ended before last requested block was read,
  2794.     the function will read as many as it can, and after that return
  2795.     eax=6 (EOF).
  2796.   * Function can read root folders /rd/1,/fd/x,/hd[n]/x, but
  2797.     in the first two cases the current implementation does not follow
  2798.     to the declared rules:
  2799.     for /rd/1:
  2800.     * if one want to read 0 blocks, function considers,
  2801.       that he requested 1;
  2802.     * if one requests more than 14 blocks or starting block is
  2803.       not less than 14, function returns eax=5 (not found) ш ebx=-1;
  2804.     * size of ramdisk root folder is 14 blocks,
  2805.       0x1C00=7168 срщЄ; but function returns ebx=0
  2806.       (except of the case of previous item);
  2807.     * strangely enough, it is possible to read 14th block (which
  2808.       generally contains a garbage - I remind, the indexing begins
  2809.       from 0);
  2810.     * if some block with the number not less than 14 was requested,
  2811.       function returns eax=6(EOF); otherwise eax=0.
  2812.     For /fd/x:
  2813.     * if the start block is not less than 14, function returns
  2814.       eax=5 (not found) and ebx=0;
  2815.     * note that format of FAT12 allows floppies with the root size
  2816.       more or less than 14 blocks;
  2817.     * check for length is not performed;
  2818.     * if data was successful read, function returns
  2819.       eax=0,ebx=0; otherwise eax=10 (access denied), ebx=-1.
  2820.   * The function handles reading of special folders /,/rd,/fd,/hd[n];
  2821.     but the result does not correspond to expected (on operations with
  2822.     normal files/folders), does not follow the declared rules,
  2823.     may be changed in future versions of the kernel and consequently
  2824.     is not described. To obtain the information about the equipment
  2825.     use subfunction 11 of function 18 or
  2826.     read corresponding folder with subfunction 1 of function 70.
  2827.  
  2828. ======================================================================
  2829. ========= Function 58, subfunction 8 - LBA-read from device. =========
  2830. ======================================================================
  2831. Parameters:
  2832.   * eax = 58 - function number
  2833.   * ebx = pointer to the information structure
  2834. Format of the information structure:
  2835.   * +0: dword: 8 = subfunction number
  2836.   * +4: dword: number of block to read (beginning from 0)
  2837.   * +8: dword: ignored (set to 1)
  2838.   * +12 = +0xC: dword: pointer to buffer for data (512 bytes)
  2839.   * +16 = +0x10: dword: pointer to buffer for system operations
  2840.     (4096 bytes)
  2841.   * +20 = +0x14: ASCIIZ-name of device: case-insensitive, one of
  2842.     /rd/1 = /RamDisk/1, /hd/n = /HardDisk/n,
  2843.     1<=n<=4 - number of device: 1=IDE0, ..., 4=IDE3.
  2844.     Instead of digits it is allowed, though not recommended for
  2845.     convenience of transition to future extensions, to use
  2846.     'first','second','third','fourth'.
  2847. Returned value:
  2848.   * for device name /hd/xxx, where xxx is not in the list above:
  2849.     * eax = ebx = 1
  2850.   * for invalid device name (except for the previous case):
  2851.     * eax = 5
  2852.     * ebx does not change
  2853.   * if LBA-access is disabled by subfunction 11 of function 21:
  2854.     * eax = 2
  2855.     * ebx destroyed
  2856.   * for ramdisk: attempt to read block outside ramdisk
  2857.     (18*2*80 blocks) results in
  2858.     * eax = 3
  2859.     * ebx = 0
  2860.   * for successful read:
  2861.     * eax = ebx = 0
  2862. Remarks:
  2863.   * Block size is 512 bytes; function reads one block.
  2864.   * Do not depend on returned value, it can be changed
  2865.     in future versions.
  2866.   * Function requires that LBA-access to devices is enabled by
  2867.     subfunction 11 of function 21. To check this one can use
  2868.     subfunction 11 of function 26.
  2869.   * LBA-read of floppy is not supported.
  2870.   * Function reads data on physical hard drive; if for any reason
  2871.     data of the concrete partition are required, application must
  2872.     define starting sector of this partition (either directly
  2873.     through MBR, or from the full structure returned by
  2874.     яюфЇєэъЎшхщ 11 ЇєэъЎшш 18).
  2875.   * Function does not check error code of hard disk, so request of
  2876.     nonexisting sector reads something (most probably it will be
  2877.     zeroes, but this is defined by device) and this is considered
  2878.     as success (eax=0).
  2879.  
  2880. ======================================================================
  2881. ==== Function 58, subfunction 15 - get information on file system. ===
  2882. ======================================================================
  2883. Parameters:
  2884.   * eax = 58 - function number
  2885.   * ebx = pointer to the information structure
  2886. Format of the information structure:
  2887.   * +0: dword: 15 = subfunction number
  2888.   * +4: dword: ignored
  2889.   * +8: dword: ignored
  2890.   * +12 = +0xC: dword: ignored
  2891.   * +16 = +0x10: dword: ignored
  2892.   * +20 = +0x14: (only second character is checked)
  2893.     /rd=/RAMDISK or /hd=/HARDDISK
  2894. Returned value:
  2895.   * if the second character does not belong to set {'r','R','h','H'}:
  2896.     * eax = 3
  2897.     * ebx = ecx = dword [fileinfo] = 0
  2898.   * for ramdisk:
  2899.     * eax = 0 (success)
  2900.     * ebx = total number of clusters = 2847
  2901.     * ecx = number of free clusters
  2902.     * dword [fileinfo] = cluster size = 512
  2903.   * for hard disk: base and partition are defined by subfunctions
  2904.     7 and 8 of function 21:
  2905.     * eax = 0 (success)
  2906.     * ebx = total number of clusters
  2907.     * ecx = number of free clusters
  2908.     * dword [fileinfo] = cluster size (in bytes)
  2909. Remarks:
  2910.   * Be not surprised to strange layout of 4th returned parameter
  2911.     - when this code was writing, at system calls application got
  2912.     only registers eax,ebx,ecx (from pushad-structure transmitted
  2913.     as argument to the system function). Now it is corrected, so,
  2914.     probably, it is meaningful to return cluster size in edx, while
  2915.     this function is not used yet.
  2916.   * There exists also subfunction 11 of function 18,
  2917.     which returns information on file system. From the full table
  2918.     of disk subsystem it is possible to deduce cluster size (there
  2919.     it is stored in sectors) and total number of clusters
  2920.     for hard disks.
  2921.  
  2922. ======================================================================
  2923. ========== Function 60 - Inter Process Communication (IPC). ==========
  2924. ======================================================================
  2925. IPC is used for message dispatching from one process/thread to
  2926. another. Previously it is necessary to agree how to interpret
  2927. the concrete message.
  2928.  
  2929. ----------- Subfunction 1 - set the area for IPC receiving -----------
  2930. Is called by process-receiver.
  2931. Parameters:
  2932.   * eax = 60 - function number
  2933.   * ebx = 1 - subfunction number
  2934.   * ecx = pointer to the buffer
  2935.   * edx = size of the buffer
  2936. Returned value:
  2937.   * eax = 0 - always success
  2938. Format of IPC-buffer:
  2939.   * +0: dword: if nonzero, buffer is considered locked;
  2940.     lock/unlock the buffer, when you work with it and need that
  2941.     buffer data are not changed from outside (no new messages)
  2942.   * +4: dword: occupied place in the buffer (in bytes)
  2943.   * +8: first message
  2944.   * +8+n: second message
  2945.   * ...
  2946. Format of a message:
  2947.   * +0: dword: PID of sender
  2948.   * +4: dword: message length (not including this header)
  2949.   * +8: n*byte: message data
  2950.  
  2951. ------------------ Subfunction 2 - send IPC message ------------------
  2952. Is called by process-sender.
  2953. Parameters:
  2954.   * eax = 60 - function number
  2955.   * ebx = 2 - subfunction number
  2956.   * ecx = PID of receiver
  2957.   * edx = pointer to the message data
  2958.   * esi = message length (in bytes)
  2959. Returned value:
  2960.   * eax = 0 - success
  2961.   * eax = 1 - the receiver has not defined buffer for IPC messages
  2962.     (can be, still have no time,
  2963.     and can be, this is not right process)
  2964.   * eax = 2 - the receiver has blocked IPC-buffer; try to wait a bit
  2965.   * eax = 3 - overflow of IPC-buffer of the receiver
  2966.   * eax = 4 - process/thread with such PID does not exist
  2967. Remarks:
  2968.   * Immediately after writing of IPC-message to the buffer the system
  2969.     sends to the receiver the event with code 7 (see event codes).
  2970.  
  2971. ======================================================================
  2972. ==== Function 61 - get parameters for the direct graphics access. ====
  2973. ======================================================================
  2974. The data of the graphics screen (the memory area which displays
  2975. screen contents) are accessible to a program directly, without
  2976. any system calls, through the selector gs:
  2977.         mov     eax, [gs:0]
  2978. places in eax the first dword of the buffer, which contains
  2979. information on color of the left upper point (and, possibly, colors
  2980. of several following).
  2981.         mov     [gs:0], eax
  2982. by work in VESA modes with LFB sets color of the left upper point
  2983. (and, possibly, colors of several following).
  2984. To interpret the data of graphics screen program needs to know
  2985. some parameters, returning by this function.
  2986. Remarks:
  2987.   * Graphics parameters changes very seldom at work,
  2988.     namely, only in cases, when user works with the application VRR.
  2989.   * At videomode change the system redraws all windows (event
  2990.     with code 1) and redraws the background (event 5).
  2991.     Same events occur in other cases too, which meet much more often,
  2992.     than videomode change.
  2993.   * By operation in videomodes with LFB the selector gs points to
  2994.     LFB itself, so reading/writing on gs result directly in
  2995.     change of screen contents. By operation in videomodes without
  2996.     LFB gs points to some data area in the kernel, and all functions
  2997.     of screen output fulfil honesty double operation on writing
  2998.     directly to the screen and writing to this buffer. In result
  2999.     at reading contents of this buffer the results correspond to
  3000.     screen contents (with, generally speaking, large color
  3001.     resolution), and writing is ignored.
  3002.     One exception is the mode 320*200, for which main loop of the
  3003.     system thread updates the screen according to mouse movements.
  3004.  
  3005. ------------------------- Screen resolution --------------------------
  3006. Parameters:
  3007.   * eax = 61 - function number
  3008.   * ebx = 1 - subfunction number
  3009. Returned value:
  3010.   * eax = [resolution on x axis]*65536 + [resolution on y axis]
  3011. Remarks:
  3012.   * One can use function 14 paying attention that
  3013.     it returns sizes on 1 pixel less. It is fully equivalent way.
  3014.  
  3015. ---------------------- Number of bits per pixel ----------------------
  3016. Parameters:
  3017.   * eax = 61 - function number
  3018.   * ebx = 2 - subfunction number
  3019. Returned value:
  3020.   * eax = number of bits per pixel (24 or 32)
  3021.  
  3022. -------------------- Number of bytes per scanline --------------------
  3023. Parameters:
  3024.   * eax = 61 - function number
  3025.   * ebx = 3 - subfunction number
  3026. Returned value:
  3027.   * eax = number of bytes occupied by one scanline
  3028.     (horizontal line on the screen)
  3029.  
  3030. ======================================================================
  3031. ===== Function 62, subfunction 0 - get version of PCI-interface. =====
  3032. ======================================================================
  3033. Parameters:
  3034.   * eax = 62 - function number
  3035.   * bl = 0 - subfunction number
  3036. Returned value:
  3037.   * eax = -1 - PCI access is disabled; otherwise
  3038.   * ah.al = version of PCI-interface (ah=version, al=subversion)
  3039.   * high word of eax is zeroed
  3040. Remarks:
  3041.   * Previously low-level access to PCI for applications must be
  3042.     enabled by subfunction 12 of function 21.
  3043.   * If PCI BIOS is not supported, the value of ax is undefined.
  3044.  
  3045. ======================================================================
  3046. ==== Function 62, subfunction 1 - get number of the last PCI-bus. ====
  3047. ======================================================================
  3048. Parameters:
  3049.   * eax = 62 - function number
  3050.   * bl = 1 - subfunction number
  3051. Returned value:
  3052.   * eax = -1 - access to PCI is disabled; otherwise
  3053.   * al = number of the last PCI-bus; other bytes of eax are destroyed
  3054. Remarks:
  3055.   * Previously low-level access to PCI for applications must be
  3056.     enabled by subfunction 12 of function 21.
  3057.   * If PCI BIOS is not supported, the value of ax is undefined.
  3058.  
  3059. ======================================================================
  3060. ===================== Function 62, subfunction 2 =====================
  3061. ===== Get mechanism of addressing to the PCI configuration space. ====
  3062. ======================================================================
  3063. Parameters:
  3064.   * eax = 62 - function number
  3065.   * bl = 2 - subfunction number
  3066. Returned value:
  3067.   * eax = -1 - access to PCI is disabled; otherwise
  3068.   * al = mechanism (1 or 2); other bytes of eax are destroyed
  3069. Remarks:
  3070.   * Previously low-level access to PCI for applications must be
  3071.     enabled by subfunction 12 of function 21.
  3072.   * Addressing mechanism is selected depending on
  3073.     equipment characteristics.
  3074.   * Subfunctions of read and write work automatically
  3075.     with the selected mechanism.
  3076.  
  3077. ======================================================================
  3078. ======== Function 62, subfunctions 4,5,6 - read PCI-register. ========
  3079. ======================================================================
  3080. Parameters:
  3081.   * eax = 62 - function number
  3082.   * bl = 4 - read byte
  3083.   * bl = 5 - read word
  3084.   * bl = 6 - read dword
  3085.   * bh = number of PCI-bus
  3086.   * ch = dddddfff, where ddddd = number of the device on the bus,
  3087.     fff = function number of device
  3088.   * cl = number of register (must be even for bl=5,
  3089.     divisible by 4 for bl=6)
  3090. Returned value:
  3091.   * eax = -1 - error (access to PCI is disabled or parameters
  3092.     are not supported); otherwise
  3093.   * al/ax/eax (depending on requested size) contains the data;
  3094.     the other part of register eax is destroyed
  3095. Remarks:
  3096.   * Previously low-level access to PCI for applications must be
  3097.     enabled by subfunction 12 of function 21.
  3098.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  3099.     function number. To get access mechanism use subfunction 2.
  3100.   * Some registers are standard and exist for all devices, some are
  3101.     defined by the concrete device. The list of registers of the
  3102.     first type can be found e.g. in famous
  3103.     Interrupt List by Ralf Brown
  3104.     (http://www.pobox.com/~ralf/files.html,
  3105.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/);
  3106.     registers of the second type must be listed
  3107.     in the device documentation.
  3108.  
  3109. ======================================================================
  3110. ====== Function 62, subfunctions 8,9,10 - write to PCI-register. =====
  3111. ======================================================================
  3112. Parameters:
  3113.   * eax = 62 - function number
  3114.   * bl = 8 - write byte
  3115.   * bl = 9 - write word
  3116.   * bl = 10 - write dword
  3117.   * bh = number of PCI-bus
  3118.   * ch = dddddfff, where ddddd = number of the device on the bus,
  3119.     fff = function number of device
  3120.   * cl = number of register (must be even for bl=9,
  3121.     divisible by 4 for bl=10)
  3122.   * dl/dx/edx (depending on requested size) contatins
  3123.     the data to write
  3124. Returned value:
  3125.   * eax = -1 - error (access to PCI is disabled or parameters
  3126.     are not supported)
  3127.   * eax = 0 - success
  3128. Remarks:
  3129.   * Previously low-level access to PCI for applications must be
  3130.     enabled by subfunction 12 of function 21.
  3131.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  3132.     function number. To get access mechanism use subfunction 2.
  3133.   * Some registers are standard and exist for all devices, some are
  3134.     defined by the concrete device. The list of registers of the
  3135.     first type can be found e.g. in famous Interrupt List by
  3136.     Ralf Brown; registers of the second type must be listed
  3137.     in the device documentation.
  3138.  
  3139. ======================================================================
  3140. ============== Function 63 - work with the debug board. ==============
  3141. ======================================================================
  3142. The debug board is the global system buffer (with the size
  3143. 1024 bytes), to which any program can write (generally speaking,
  3144. arbitrary) data and from which other program can read these data.
  3145. By the agreement written data are text strings interpreted as
  3146. debug messages on a course of program execution. The kernel in
  3147. some situations also writes to the debug board information on
  3148. execution of some functions; by the agreement kernel messages
  3149. begins from the prefix "K : ".
  3150. For view of the debug board the application 'board' was created,
  3151. which reads data from the buffer and displays them in its window.
  3152. 'board' interpretes the sequence of codes 13,10 as newline.
  3153. A character with null code in an end of line is not necessary,
  3154. but also does not prevent.
  3155. Because debugger has been written, the value of the debug board
  3156. has decreased, as debugger allows to inspect completely a course of
  3157. program execution without any efforts from the direction of program
  3158. itself. Nevertheless in some cases the debug board is still useful.
  3159.  
  3160. ----------------------------- Write byte -----------------------------
  3161. Parameters:
  3162.   * eax = 63 - function number
  3163.   * ebx = 1 - subfunction number
  3164.   * cl = data byte
  3165. Returned value:
  3166.   * function does not return value
  3167. Remarks:
  3168.   * Byte is written to the buffer. Buffer size is 512 bytes.
  3169.     At buffer overflow all obtained data are lost.
  3170.   * For output to the debug board of more complicated objects
  3171.     (strings, numbers) it is enough to call this function in cycle.
  3172.     It is possible not to write the appropriate code manually and use
  3173.     file 'debug.inc', which is included into the distributive.
  3174.  
  3175. ----------------------------- Read byte ------------------------------
  3176. Takes away byte from the buffer.
  3177. Parameters:
  3178.   * eax = 63 - function number
  3179.   * ebx = 2 - subfunction number
  3180. Returned value:
  3181.   * eax = ebx = 0 - the buffer is empty
  3182.   * eax = byte, ebx = 1 - byte was successfully read
  3183.  
  3184. ======================================================================
  3185. ============== Function 64 - resize application memory. ==============
  3186. ======================================================================
  3187. Parameters:
  3188.   * eax = 64 - function number
  3189.   * ebx = 1 - unique subfunction
  3190.   * ecx = new memory size
  3191. Returned value:
  3192.   * eax = 0 - success
  3193.   * eax = 1 - not enough memory
  3194. Remarks:
  3195.   * There is another way to dynamically allocate/free memory -
  3196.     subfunctions 11, 12, 13 of function 68.
  3197.   * The function cannot be used together with 68.11, 68.12, 68.13.
  3198.     The function call will be ignored after creation of process heap
  3199.     with function 68.11.
  3200.  
  3201. ======================================================================
  3202. ======== Function 65 - draw image with palette in the window. ========
  3203. ======================================================================
  3204. Parameters:
  3205.   * eax = 65 - function number
  3206.   * ebx = pointer to the image
  3207.   * ecx = [size on axis x]*65536 + [size on axis y]
  3208.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  3209.   * esi = number of bits per pixel, must be 1,2,4,8,15,16,24 or 32
  3210.   * edi = pointer to palette (2 to the power esi colors 0x00RRGGBB);
  3211.           ignored when esi > 8
  3212.   * ebp = offset of next row data relative to previous row data
  3213. Returned value:
  3214.   * function does not return value
  3215. Remarks:
  3216.   * Coordinates of the image are coordinates of the upper left corner
  3217.     of the image relative to the window.
  3218.   * Format of image with 1 bit per pixel: each byte of image
  3219.     (possibly excluding last bytes in rows), contains information on
  3220.     the color of 8 pixels, MSB corresponds to first pixel.
  3221.   * Format of image with 2 bits per pixel: each byte of image
  3222.     (possibly excluding last bytes in rows), contains information on
  3223.     the color of 4 pixels, two MSBs correspond to first pixel.
  3224.   * Format of image with 4 bits per pixel: each byte of image
  3225.     excluding last bytes in rows (if width is odd) contains
  3226.     information on the color of 2 pixels, high-order tetrad
  3227.     corresponds to first pixel.
  3228.   * Format of image with 8 bits per pixel: each byte of image is
  3229.     index in the palette.
  3230.   * Format of image with 15 bits per pixel: the color of each pixel
  3231.     is coded as (bit representation) 0RRRRRGGGGGBBBBB - 5 bits per
  3232.     each color.
  3233.   * Format of image with 16 bits per pixel: the color of each pixel
  3234.     is coded as RRRRRGGGGGGBBBBB (5+6+5).
  3235.   * Format of image with 24 bits per pixel: the color of each pixel
  3236.     is coded as 3 bytes - sequentially blue, green, red components.
  3237.   * Format of image with 32 bits per pixel: similar to 24, but
  3238.     one additional ignored byte is present.
  3239.   * The call to function 7 is equivalent to call to this function
  3240.     with esi=24, ebp=0.
  3241.  
  3242. ======================================================================
  3243. ================== Function 66 - work with keyboard. =================
  3244. ======================================================================
  3245. The input mode influences results of reading keys by function 2.
  3246. When a program loads, ASCII input mode is set for it.
  3247.  
  3248. -------------- Subfunction 1 - set keyboard input mode. --------------
  3249. Parameters:
  3250.   * eax = 66 - function number
  3251.   * ebx = 1 - subfunction number
  3252.   * ecx = mode:
  3253.     * 0 = normal (ASCII-characters)
  3254.     * 1 = scancodes
  3255. Returned value:
  3256.   * function does not return value
  3257.  
  3258. -------------- Subfunction 2 - get keyboard input mode. --------------
  3259. Parameters:
  3260.   * eax = 66 - function number
  3261.   * ebx = 2 - subfunction number
  3262. Returned value:
  3263.   * eax = current mode
  3264.  
  3265. ------------ Subfunction 3 - get status of control keys. -------------
  3266. Parameters:
  3267.   * eax = 66 - function number
  3268.   * ebx = 3 - subfunction number
  3269. Returned value:
  3270.   * eax = bit mask:
  3271.   * bit 0 (mask 1): left Shift is pressed
  3272.   * bit 1 (mask 2): right Shift is pressed
  3273.   * bit 2 (mask 4): left Ctrl is pressed
  3274.   * bit 3 (mask 8): right Ctrl is pressed
  3275.   * bit 4 (mask 0x10): left Alt is pressed
  3276.   * bit 5 (mask 0x20): right Alt is pressed
  3277.   * bit 6 (mask 0x40): CapsLock is on
  3278.   * bit 7 (mask 0x80): NumLock is on
  3279.   * bit 8 (mask 0x100): ScrollLock is on
  3280.   * other bits are cleared
  3281.  
  3282. -------------- Subfunction 4 - set system-wide hotkey. ---------------
  3283. When hotkey is pressed, the system notifies only those applications,
  3284. which have installed it; the active application (which receives
  3285. all normal input) does not receive such keys.
  3286. The notification consists in sending event with the code 2.
  3287. Reading hotkey is the same as reading normal key - by function 2.
  3288. Parameters:
  3289.   * eax = 66 - function number
  3290.   * ebx = 4 - subfunction number
  3291.   * cl determines key scancode;
  3292.     use cl=0 to give combinations such as Ctrl+Shift
  3293.   * edx = 0xXYZ determines possible states of control keys:
  3294.     * Z (low 4 bits) determines state of LShift and RShift:
  3295.       * 0 = no key must be pressed;
  3296.       * 1 = exactly one key must be pressed;
  3297.       * 2 = both keys must be pressed;
  3298.       * 3 = must be pressed LShift, but not RShift;
  3299.       * 4 = must be pressed RShift, but not LShift
  3300.     * Y - similar for LCtrl and RCtrl;
  3301.     * X - similar for LAlt and RAlt
  3302. Returned value:
  3303.   * eax=0 - success
  3304.   * eax=1 - too mant hotkeys (maximum 256 are allowed)
  3305. Remarks:
  3306.   * Hotkey can work either at pressing or at release. Release
  3307.     scancode of a key is more on 128 than pressing scancode
  3308.     (i.e. high bit is set).
  3309.   * Several applications can set the same combination;
  3310.     all such applications will be informed on pressing
  3311.     such combination.
  3312.  
  3313. -------------- Subfunction 5 - delete installed hotkey. --------------
  3314. Parameters:
  3315.   * eax = 66 - function number
  3316.   * ebx = 5 - subfunction number
  3317.   * cl = scancode of key and edx = 0xXYZ the same as in subfunction 4
  3318. Returned value:
  3319.   * eax = 0 - success
  3320.   * eax = 1 - there is no such hotkey
  3321. Remarks:
  3322.   * When a process/thread terminates, all hotkey installed by it are
  3323.     deleted.
  3324.   * The call to this subfunction does not affect other applications.
  3325.     If other application has defined the same combination, it will
  3326.     still receive notices.
  3327.  
  3328. ======================================================================
  3329. ========= Function 67 - change position/sizes of the window. =========
  3330. ======================================================================
  3331. Parameters:
  3332.   * eax = 67 - function number
  3333.   * ebx = new x-coordinate of the window
  3334.   * ecx = new y-coordinate of the window
  3335.   * edx = new x-size of the window
  3336.   * esi = new y-size of the window
  3337. Returned value:
  3338.   * function does not return value
  3339. Remarks:
  3340.   * The value -1 for a parameter means "do not change"; e.g. to move
  3341.     the window without resizing it is possible to specify edx=esi=-1.
  3342.   * Previously the window must be defined by function 0.
  3343.     It sets initial coordinates and sizes of the window.
  3344.   * Sizes of the window are understood in sense of function 0,
  3345.     that is one pixel less than real sizes.
  3346.   * The function call for maximized windows is simply ignored.
  3347.   * For windows of appropriate styles position and/or sizes can be
  3348.     changed by user; current position and sizes can be obtained by
  3349.     call to function 9.
  3350.   * The function sends to the window redraw event (with the code 1).
  3351.  
  3352. ======================================================================
  3353. ====== Function 68, subfunction 0 - get the task switch counter. =====
  3354. ======================================================================
  3355. Parameters:
  3356.   * eax = 68 - function number
  3357.   * ebx = 0 - subfunction number
  3358. Returned value:
  3359.   * eax = number of task switches from the system booting
  3360.     (modulo 2^32)
  3361.  
  3362. ======================================================================
  3363. ======= Function 68, subfunction 1 - switch to the next thread. ======
  3364. ======================================================================
  3365. The function completes the current time slice allocated to the
  3366. thread and switches to the next. (Which thread in which process
  3367. will be next, is unpredictable). Later, when execution queue
  3368. will reach the current thread, execution will be continued.
  3369. Parameters:
  3370.   * eax = 68 - function number
  3371.   * ebx = 1 - subfunction number
  3372. Returned value:
  3373.   * function does not return value
  3374.  
  3375. ======================================================================
  3376. ============= Function 68, subfunction 2 - cache + rdpmc. ============
  3377. ======================================================================
  3378. Parameters:
  3379.   * eax = 68 - function number
  3380.   * ebx = 2 - subfunction number
  3381.   * ecx = required action:
  3382.     * ecx = 0 - enable instruction 'rdpmc'
  3383.       (ReaD Performance-Monitoring Counters) for applications
  3384.     * ecx = 1 - find out whether cache is disabled/enabled
  3385.     * ecx = 2 - enable cache
  3386.     * ecx = 3 - disable cache
  3387. Returned value:
  3388.   * for ecx=0:
  3389.     * eax = the value of cr4
  3390.   * for ecx=1:
  3391.     * eax = (cr0 and 0x60000000):
  3392.     * eax = 0 - cache is on
  3393.     * eax <> 0 - cache is off
  3394.   * for ecx=2 and ecx=3:
  3395.     * function does not return value
  3396.  
  3397. ======================================================================
  3398. =========== Function 68, subfunction 3 - read MSR-register. ==========
  3399. ======================================================================
  3400. MSR = Model Specific Register; the complete list of MSR-registers
  3401. of a processor is included to the documentation on it (for example,
  3402. IA-32 Intel Architecture Software Developer's Manual,
  3403. Volume 3, Appendix B); each processor family has its own subset
  3404. of the MSR-registers.
  3405. Parameters:
  3406.   * eax = 68 - function number
  3407.   * ebx = 3 - subfunction number
  3408.   * ecx is ignored
  3409.   * edx = MSR address
  3410. Returned value:
  3411.   * ebx:eax = high:low dword of the result
  3412. Remarks:
  3413.   * If ecx contains nonexistent or not implemented for this processor
  3414.     MSR, processor will generate an exception in the kernel, which
  3415.     will kill the thread.
  3416.   * Previously it is necessary to check, whether MSRs are supported
  3417.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3418.     will generate other exception in the kernel, which will anyway
  3419.     kill the thread.
  3420.  
  3421. ======================================================================
  3422. ========= Function 68, subfunction 4 - write to MSR-register. ========
  3423. ======================================================================
  3424. MSR = Model Specific Register; the complete list of MSR-registers
  3425. of a processor is included to the documentation on it (for example,
  3426. IA-32 Intel Architecture Software Developer's Manual,
  3427. Volume 3, Appendix B); each processor family has its own subset
  3428. of the MSR-registers.
  3429. Parameters:
  3430.   * eax = 68 - function number
  3431.   * ebx = 4 - subfunction number
  3432.   * ecx is ignored
  3433.   * edx = MSR address
  3434.   * esi:edi = high:low dword
  3435. Returned value:
  3436.   * function does not return value
  3437. Remarks:
  3438.   * If ecx contains nonexistent or not implemented for this processor
  3439.     MSR, processor will generate an exception in the kernel, which
  3440.     will kill the thread.
  3441.   * Previously it is necessary to check, whether MSRs are supported
  3442.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3443.     will generate other exception in the kernel, which will anyway
  3444.     kill the thread.
  3445.  
  3446. ======================================================================
  3447. ======= Function 68, subfunction 11 - initialize process heap. =======
  3448. ======================================================================
  3449. Parameters:
  3450.   * eax = 68 - function number
  3451.   * ebx = 11 - subfunction number
  3452. Returned value:
  3453.   * eax = 0 - failed
  3454.   * otherwise size of created heap
  3455. Remarks:
  3456.   * The function call initializes heap, from which one can in future
  3457.     allocate and free memory blocks with subfunctions 12 and 13.
  3458.     Heap size is equal to total amount of free application memory.
  3459.   * The second function call from the same process results in
  3460.     returning the size of the existing heap.
  3461.   * After creation of the heap calls to function 64 will be ignored.
  3462.  
  3463. ======================================================================
  3464. ======== Function 68, subfunction 12 - allocate memory block. ========
  3465. ======================================================================
  3466. Parameters:
  3467.   * eax = 68 - function number
  3468.   * ebx = 12 - subfunction number
  3469.   * ecx = required size in bytes
  3470. Returned value:
  3471.   * eax = pointer to the allocated block
  3472. Remarks:
  3473.   * Before this call one must initialize process heap by call to
  3474.     subfunction 11.
  3475.   * The function allocates an integer number of pages (4 Kb) in such
  3476.     way that the real size of allocated block is more than or equal to
  3477.     requested size.
  3478.  
  3479. ======================================================================
  3480. ========== Function 68, subfunction 13 - free memory block. ==========
  3481. ======================================================================
  3482. Parameters:
  3483.   * eax = 68 - function number
  3484.   * ebx = 13 - subfunction number
  3485.   * ecx = pointer to the memory block
  3486. Returned value:
  3487.   * eax = 1 - success
  3488.   * eax = 0 - failed
  3489. Remarks:
  3490.   * The memory block must have been allocated by subfunction 12
  3491.     or subfunction 20.
  3492.  
  3493. ======================================================================
  3494. ===================== Function 68, subfunction 14 ====================
  3495. ============ Wait for signal from another program/driver. ============
  3496. ======================================================================
  3497. Parameters:
  3498.   * eax = 68 - function number
  3499.   * ebx = 14 - subfunction number
  3500.   * ecx = pointer to the buffer for information (24 bytes)
  3501. Returned value:
  3502.   * buffer pointed to by ecx contains the following information:
  3503.     * +0: dword: identifier for following data of signal
  3504.     * +4: dword: data of signal (20 bytes), format of which is defined
  3505.           by the first dword
  3506.  
  3507. ======================================================================
  3508. ============= Function 68, subfunction 16 - load driver. =============
  3509. ======================================================================
  3510. Parameters:
  3511.   * eax = 68 - function number
  3512.   * ebx = 16 - subfunction number
  3513.   * ecx = pointer to ASCIIZ-string with driver name
  3514. Returned value:
  3515.   * eax = 0 - failed
  3516.   * otherwise eax = driver handle
  3517. Remarks:
  3518.   * If the driver was not loaded yet, it is loaded;
  3519.     if the driver was loaded yet, nothing happens.
  3520.   * Driver name is case-sensitive.
  3521.     Maximum length of the name is 16 characters, including
  3522.     terminating null character, the rest is ignored.
  3523.   * Driver ABC is loaded from file /rd/1/drivers/ABC.obj.
  3524.  
  3525. ======================================================================
  3526. ============ Function 68, subfunction 17 - driver control. ===========
  3527. ======================================================================
  3528. Parameters:
  3529.   * eax = 68 - function number
  3530.   * ebx = 17 - subfunction number
  3531.   * ecx = pointer to the control structure:
  3532.     * +0: dword: handle of driver
  3533.     * +4: dword: code of driver function
  3534.     * +8: dword: pointer to input data
  3535.     * +12 = +0xC: dword: size of input data
  3536.     * +16 = +0x10: dword: pointer to output data
  3537.     * +20 = +0x14: dword: size of output data
  3538. Returned value:
  3539.   * eax = determined by driver
  3540. Remarks:
  3541.   * Function codes and the structure of input/output data
  3542.     are defined by driver.
  3543.   * Previously one must obtain driver handle by subfunction 16.
  3544.  
  3545. ======================================================================
  3546. =============== Function 68, subfunction 19 - load DLL. ==============
  3547. ======================================================================
  3548. Parameters:
  3549.   * eax = 68 - function number
  3550.   * ebx = 19 - subfunction number
  3551.   * ecx = pointer to ASCIIZ-string with the full path to DLL
  3552. Returned value:
  3553.   * eax = 0 - failed
  3554.   * otherwise eax = pointer to DLL export table
  3555. Remarks:
  3556.   * Export table is an array of structures of 2 dword's, terminated
  3557.     by zero. The first dword in structure points to function name,
  3558.     the second dword contains address of function.
  3559.  
  3560. ======================================================================
  3561. ======= Function 68, subfunction 20 - reallocate memory block. =======
  3562. ======================================================================
  3563. Parameters:
  3564.   * eax = 68 - function number
  3565.   * ebx = 20 - subfunction number
  3566.   * ecx = new size in bytes
  3567.   * edx = pointer to already allocated block
  3568. Returned value:
  3569.   * eax = pointer to the reallocated block, 0 = error
  3570. Remarks:
  3571.   * Before this call one must initialize process heap by call to
  3572.     subfunction 11.
  3573.   * The function allocates an integer number of pages (4 Kb) in such
  3574.     way that the real size of allocated block is more than or equal to
  3575.     requested size.
  3576.   * If edx=0, the function call is equivalent to memory allocation
  3577.     with subfunction 12. Otherwise the block at edx
  3578.     must be allocated earlier with subfunction 12 or this subfunction.
  3579.   * If ecx=0, the function frees memory block at edx and returns 0.
  3580.   * The contents of the block are unchanged up to the shorter of
  3581.     the new and old sizes.
  3582.  
  3583. ======================================================================
  3584. ======== Function 68, subfunction 22 - open named memory area. =======
  3585. ======================================================================
  3586. Parameters:
  3587.   * eax = 68 - function number
  3588.   * ebx = 22 - subfunction number
  3589.   * ecx = area name. Maximum of 31 characters with terminating zero
  3590.   * edx = area size in bytes for SHM_CREATE and SHM_OPEN_ALWAYS
  3591.   * esi = flags for open and access:
  3592.     * SHM_OPEN        = 0x00 - open existing memory area. If an area
  3593.                           with such name does not exist, the function
  3594.                           will return error code 5.
  3595.     * SHM_OPEN_ALWAYS = 0x04 - open existing or create new
  3596.                           memory area.
  3597.     * SHM_CREATE      = 0x08 - create new memory area. If an area
  3598.                           with such name already exists, the function
  3599.                           will return error code 10.
  3600.     * SHM_READ        = 0x00 - only read access
  3601.     * SHM_WRITE       = 0x01 - read and write access
  3602. Returned value:
  3603.   * eax = pointer to memory area, 0 if error has occured
  3604.   * if new area is created (SHM_CREATE or SHM_OPEN_ALWAYS):
  3605.     edx = 0 - success, otherwise - error code
  3606.   * if existing area is opened (SHM_OPEN or SHM_OPEN_ALWAYS):
  3607.     edx = error code (if eax=0) or area size in bytes
  3608. Error codes:
  3609.   * E_NOTFOUND = 5
  3610.   * E_ACCESS = 10
  3611.   * E_NOMEM = 30
  3612.   * E_PARAM = 33
  3613. Remarks:
  3614.   * Before this call one must initialize process heap by call to
  3615.     subfunction 11.
  3616.   * If a new area is created, access flags set maximal rights
  3617.     for other processes. An attempt from other process to open
  3618.     with denied rights will fail with error code E_ACCESS.
  3619.   * The process which has created an area always has write access.
  3620.  
  3621. ======================================================================
  3622. ======= Function 68, subfunction 23 - close named memory area. =======
  3623. ======================================================================
  3624. Parameters:
  3625.   * eax = 68 - function number
  3626.   * ebx = 23 - subfunction number
  3627.   * ecx = area name. Maximum of 31 characters with terminating zero
  3628. Returned value:
  3629.   * eax destroyed
  3630. Remarks:
  3631.   * A memory area is physically freed (with deleting all data and
  3632.     freeing physical memory), when all threads which have opened
  3633.     this area will close it.
  3634.   * When thread is terminating, all opened by it areas are closed.
  3635.  
  3636. ======================================================================
  3637. ======== Function 68, subfunction 24 - set exception handler. ========
  3638. ======================================================================
  3639. Parameters:
  3640.   * eax = 68 - function number
  3641.   * ebx = 24 - subfunction number
  3642.   * ecx = address of the new exception handler
  3643.   * edx = the mask of handled exceptions
  3644. Returned value:
  3645.   * eax = address of the old exception handler (0, if it was not set)
  3646.   * ebx = the old mask of handled exceptions
  3647. Remarks:
  3648.   * Bit number in mask of exceptions corresponds to exception number
  3649.     in CPU-specification (Intel-PC). For example, FPU exceptions have
  3650.     number 16 (#MF), and SSE exceptions - 19 (#XF).
  3651.   * The current implementation ignores the inquiry for hook of 7
  3652.     exception - the system handles #NM by its own.
  3653.   * The exception handler is called with exception number as first
  3654.     (and only) stack parameter. So, correct exit from the handler is
  3655.     RET 4. It returns to the instruction, that caused the exception,
  3656.     for faults, and to the next instruction for traps (see
  3657.     classification of exceptions in CPU specification).
  3658.   * When user handler receives control, the corresponding bit in
  3659.     the exception mask is cleared. Raising this exception
  3660.     in consequence leads to default handling, that is,
  3661.     terminating the application in absence of debugger or
  3662.     suspend with notification of debugger otherwise.
  3663.   * After user handler completes critical operations, it can set
  3664.     the corresponding bit in the exception mask with subfunction 25.
  3665.     Also user handler is responsible for clearing exceptions flags in
  3666.     FPU and/or SSE.
  3667.  
  3668. ======================================================================
  3669. ====== Function 68, subfunction 25 - set FPU exception handler. ======
  3670. ======================================================================
  3671. Parameters:
  3672.   * eax = 68 - function number
  3673.   * ebx = 25 - subfunction number
  3674.   * ecx = signal number
  3675.   * edx = value of activity (0/1)
  3676. Returned value:
  3677.   * eax = -1 - invalid signal number
  3678.   * otherwise eax = old value of activity for this signal (0/1)
  3679. Remarks:
  3680.   * In current implementation only mask for user excepton handler,
  3681.     which has been previously set by subfunction 24,
  3682.     is changed. Signal number corresponds to exception number.
  3683.  
  3684. ======================================================================
  3685. ====================== Function 69 - debugging. ======================
  3686. ======================================================================
  3687. A process can load other process as debugged by set of corresponding
  3688. bit by call to subfunction 7 of function 70.
  3689. A process can have only one debugger; one process can debug some
  3690. others. The system notifies debugger on events occuring with
  3691. debugged process. Messages are written to the buffer defined by
  3692. subfunction 0.
  3693. Format of a message:
  3694.   * +0: dword: message code
  3695.   * +4: dword: PID of debugged process
  3696.   * +8: there can be additional data depending on message code
  3697. Message codes:
  3698.   * 1 = exception
  3699.     * in addition dword-number of the exception is given
  3700.     * process is suspended
  3701.   * 2 = process has terminated
  3702.     * comes at any termination: both through the system function -1,
  3703.       and at "murder" by any other process (including debugger itself)
  3704.   * 3 = debug exception int 1 = #DB
  3705.     * in addition dword-image of the register DR6 is given:
  3706.       * bits 0-3: condition of the corresponding breakpoint (set by
  3707.         subfunction 9) is satisfied
  3708.       * сшЄ 14: exception has occured because of the trace mode
  3709.         (flag TF is set TF)
  3710.     * process is suspended
  3711. When debugger terminates, all debugged processes are killed.
  3712. If debugger does not want this, it must previously detach by
  3713. subfunction 3.
  3714.  
  3715. All subfunctions are applicable only to processes/threads started
  3716. from the current by function 70 with set debugging flag.
  3717. Debugging of multithreaded programs is not supported yet.
  3718. The full list of subfunctions:
  3719.   * subfunction 0 - define data area for debug messages
  3720.   * subfunction 1 - get contents of registers of debugged thread
  3721.   * subfunction 2 - set contents of registers of debugged thread
  3722.   * subfunction 3 - detach from debugged process
  3723.   * subfunction 4 - suspend debugged thread
  3724.   * subfunction 5 - resume debugged thread
  3725.   * subfunction 6 - read from the memory of debugged process
  3726.   * subfunction 7 - write to the memory of debugged process
  3727.   * subfunction 8 - terminate debugged thread
  3728.   * subfunction 9 - set/clear hardware breakpoint
  3729.  
  3730. ======================================================================
  3731. = Function 69, subfunction 0 - define data area fror debug messages. =
  3732. ======================================================================
  3733. Parameters:
  3734.   * eax = 69 - function number
  3735.   * ebx = 0 - subfunction number
  3736.   * ecx = pointer
  3737. Format of data area:
  3738.   * +0: dword: N = buffer size (not including this header)
  3739.   * +4: dword: occupied place
  3740.   * +8: N*byte: buffer
  3741. Returned value:
  3742.   * function does not return value
  3743. Remarks:
  3744.   * If the size field is negative, the buffer is considered locked
  3745.     and at arrival of new message the system will wait.
  3746.     For synchronization frame all work with the buffer by operations
  3747.     lock/unlock
  3748.         neg     [bufsize]
  3749.   * Data in the buffer are considered as array of items with variable
  3750.     length - messages. Format of a message is explained in
  3751.     general description.
  3752.  
  3753. ======================================================================
  3754. ===================== Function 69, subfunction 1 =====================
  3755. ============ Get contents of registers of debugged thread. ===========
  3756. ======================================================================
  3757. Parameters:
  3758.   * eax = 69 - function number
  3759.   * ebx = 1 - subfunction number
  3760.   * ecx = thread identifier
  3761.   * edx = size of context structure, must be 0x28=40 bytes
  3762.   * esi = pointer to context structure
  3763. Returned value:
  3764.   * function does not return value
  3765. Format of context structure: (FPU is not supported yet)
  3766.   * +0: dword: eip
  3767.   * +4: dword: eflags
  3768.   * +8: dword: eax
  3769.   * +12 = +0xC: dword: ecx
  3770.   * +16 = +0x10: dword: edx
  3771.   * +20 = +0x14: dword: ebx
  3772.   * +24 = +0x18: dword: esp
  3773.   * +28 = +0x1C: dword: ebp
  3774.   * +32 = +0x20: dword: esi
  3775.   * +36 = +0x24: dword: edi
  3776. Remarks:
  3777.   * If the thread executes code of ring-0, the function returns
  3778.     contents of registers of ring-3.
  3779.   * Process must be loaded for debugging (as is shown in
  3780.     general description).
  3781.  
  3782. ======================================================================
  3783. ===================== Function 69, subfunction 2 =====================
  3784. ============ Set contents of registers of debugged thread. ===========
  3785. ======================================================================
  3786. Parameters:
  3787.   * eax = 69 - function number
  3788.   * ebx = 2 - subfunction number
  3789.   * ecx = thread identifier
  3790.   * edx = size of context structure, must be 0x28=40 bytes
  3791. Returned value:
  3792.   * function does not return value
  3793. Format of context structure is shown in the description of
  3794. subfunction 1.
  3795. Remarks:
  3796.   * If the thread executes code of ring-0, the function returns
  3797.     contents of registers of ring-3.
  3798.   * Process must be loaded for debugging (as is shown in
  3799.     general description).
  3800.  
  3801. ======================================================================
  3802. ===== Function 69, subfunction 3 - detach from debugged process. =====
  3803. ======================================================================
  3804. Parameters:
  3805.   * eax = 69 - function number
  3806.   * ebx = 3 - subfunction number
  3807.   * ecx = identifier
  3808. Returned value:
  3809.   * function does not return value
  3810. Remarks:
  3811.   * If the process was suspended, it resumes execution.
  3812.  
  3813. ======================================================================
  3814. ======== Function 69, subfunction 4 - suspend debugged thread. =======
  3815. ======================================================================
  3816. Parameters:
  3817.   * eax = 69 - function number
  3818.   * ebx = 4 - subfunction number
  3819.   * ecx = thread identifier
  3820. Returned value:
  3821.   * function does not return value
  3822. Remarks:
  3823.   * Process must be loaded for debugging (as is shown in
  3824.     general description).
  3825.  
  3826. ======================================================================
  3827. ======== Function 69, subfunction 5 - resume debugged thread. ========
  3828. ======================================================================
  3829. Parameters:
  3830.   * eax = 69 - function number
  3831.   * ebx = 5 - subfunction number
  3832.   * ecx = thread identifier
  3833. Returned value:
  3834.   * function does not return value
  3835. Remarks:
  3836.   * Process must be loaded for debugging (as is shown in
  3837.     general description).
  3838.  
  3839. ======================================================================
  3840. = Fucntion 69, subfunction 6 - read from memory of debugged process. =
  3841. ======================================================================
  3842. Parameters:
  3843.   * eax = 69 - function number
  3844.   * ebx = 6 - subfunction number
  3845.   * ecx = identifier
  3846.   * edx = number of bytes to read
  3847.   * esi = address in the memory of debugged process
  3848.   * edi = pointer to buffer for data
  3849. Returned value:
  3850.   * eax = -1 at an error (invalid PID or buffer)
  3851.   * otherwise eax = number of read bytes (possibly, 0,
  3852.     if esi is too large)
  3853. Remarks:
  3854.   * Process must be loaded for debugging (as is shown in
  3855.     general description).
  3856.  
  3857. ======================================================================
  3858. == Function 69, subfunction 7 - write to memory of debugged process. =
  3859. ======================================================================
  3860. Parameters:
  3861.   * eax = 69 - function number
  3862.   * ebx = 7 - subfunction number
  3863.   * ecx = identifier
  3864.   * edx = number of bytes to write
  3865.   * esi = address of memory in debugged process
  3866.   * edi = pointer to data
  3867. Returned value:
  3868.   * eax = -1 at an error (invalid PID or buffer)
  3869.   * otherwise eax = number of written bytes (possibly, 0,
  3870.     if esi is too large)
  3871. Remarks:
  3872.   * Process must be loaded for debugging (as is shown in
  3873.     general description).
  3874.  
  3875. ======================================================================
  3876. ======= Function 69, subfunction 8 - terminate debugged thread. ======
  3877. ======================================================================
  3878. Parameters:
  3879.   * eax = 69 - function number
  3880.   * ebx = 8 - subfunction number
  3881.   * ecx = identifier
  3882. Returned value:
  3883.   * function does not return value
  3884. Remarks:
  3885.   * Process must be loaded for debugging (as is shown in
  3886.     general description).
  3887.   * The function is similar to subfunction 2 of function 18
  3888.     with two differences: it requires first remark and
  3889.     accepts PID rather than slot number.
  3890.  
  3891. ======================================================================
  3892. ===== Function 69, subfunction 9 - set/clear hardware breakpoint. ====
  3893. ======================================================================
  3894. Parameters:
  3895.   * eax = 69 - function number
  3896.   * ebx = 9 - subfunction number
  3897.   * ecx = thread identifier
  3898.   * dl = index of breakpoint, from 0 to 3 inclusively
  3899.   * dh = flags:
  3900.     * if high bit is cleared - set breakpoint:
  3901.       * bits 0-1 - condition:
  3902.         * 00 = breakpoint on execution
  3903.         * 01 = breakpoint on read
  3904.         * 11 = breakpoint on read/write
  3905.       * bits 2-3 - length; for breakpoints on exception it must be
  3906.         00, otherwise one of
  3907.         * 00 = byte
  3908.         * 01 = word
  3909.         * 11 = dword
  3910.       * esi = breakpoint address; must be aligned according to
  3911.         the length (i.e. must be even for word breakpoints,
  3912.         divisible by 4 for dword)
  3913.     * if high bit is set - clear breakpoint
  3914. Returned value:
  3915.   * eax = 0 - success
  3916.   * eax = 1 - error in the input data
  3917.   * eax = 2 - (reserved, is never returned in the current
  3918.     implementation) a global breakpoint with that index is already set
  3919. Remarks:
  3920.   * Process must be loaded for debugging (as is shown in
  3921.     general description).
  3922.   * Hardware breakpoints are implemented through DRx-registers of
  3923.     the processor, all limitations results from this.
  3924.   * The function can reinstall the breakpoint, previously set
  3925.     by it (and it does not inform on this).
  3926.     Carry on the list of set breakpoints in the debugger.
  3927.   * Breakpoints generate debug exception #DB, on which the system
  3928.     notifies debugger.
  3929.   * Breakpoints on write and read/write act after
  3930.     execution of the caused it instruction.
  3931.  
  3932. ======================================================================
  3933. ==== Function 70 - work with file system with long names support. ====
  3934. ======================================================================
  3935. Parameters:
  3936.   * eax = 70
  3937.   * ebx = pointer to the information structure
  3938. Returned value:
  3939.   * eax = 0 - success; otherwise file system error code
  3940.   * some subfunctions return value in other registers too
  3941. General format of the information structure:
  3942.   * +0: dword: subfunction number
  3943.   * +4: dword: file offset
  3944.   * +8: dword: high dword of offset (must be 0) or flags field
  3945.   * +12 = +0xC: dword: size
  3946.   * +16 = +0x10: dword: pointer to data
  3947.   * +20 = +0x14: n db: ASCIIZ-string with the filename
  3948.     or
  3949.   * +20 = +0x14: db 0
  3950.   * +21 = +0x15: dd pointer to ASCIIZ-string with the filename
  3951. Specifications - in documentation on the appropriate subfunction.
  3952. Filename is case-insensitive. Russian letters must be written in
  3953. the encoding cp866 (DOS).
  3954. Format of filename:
  3955. /base/number/dir1/dir2/.../dirn/file,
  3956. where /base/number identifies device, on which file is located:
  3957. one of
  3958.   * /RD/1 = /RAMDISK/1 to access ramdisk
  3959.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  3960.     /FD/2 = /FLOPPYDISK/2 to access second one
  3961.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  3962.     IDE0 (Primary Master), IDE1 (Primary Slave),
  3963.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  3964.     x - partition number on the selected hard drive, varies from 1
  3965.     to 255 (on each hard drive the indexing starts from 1)
  3966.   * /CD0/1, /CD1/1, /CD2/1, /CD3/1 to access accordingly to
  3967.     CD on IDE0 (Primary Master), IDE1 (Primary Slave),
  3968.     IDE2 (Secondary Master), IDE3 (Secondary Slave)
  3969.   * /SYS means system folder; with the usual boot (from floppy)
  3970.     is equivalent to /RD/1
  3971. Examples:
  3972.   * '/rd/1/kernel.asm',0
  3973.   * '/HD0/1/kernel.asm',0
  3974.   * '/hd0/2/menuet/pics/tanzania.bmp',0
  3975.   * '/hd0/1/Program files/NameOfProgram/SomeFile.SomeExtension',0
  3976.   * '/sys/MySuperApp.ini',0
  3977. Also function supports relative names.  If the path begins not
  3978. with '/', it is considered relative to a current folder. To get or
  3979. set a current folder, use the function 30.
  3980.  
  3981. Available subfunctions:
  3982.   * subfunction 0 - read file
  3983.   * subfunction 1 - read folder
  3984.   * subfunction 2 - create/rewrite file
  3985.   * subfunction 3 - write to existing file
  3986.   * subfunction 4 - set file size
  3987.   * subfunction 5 - get attributes of file/folder
  3988.   * subfunction 6 - set attributes of file/folder
  3989.   * subfunction 7 - start application
  3990.   * subfunction 8 - delete file/folder
  3991.   * subfunction 9 - create folder
  3992. For CD-drives due to hardware limitations only subfunctions
  3993. 0,1,5 and 7 are available, other subfunctions return error
  3994. with code 2.
  3995. At the first call of subfunctions 0,1,5,7 to ATAPI devices
  3996. (CD and DVD) the manual control of tray is locked due to caching
  3997. drive data. Unlocking is made when subfunction 4 of function 24
  3998. is called for corresponding device.
  3999.  
  4000. ======================================================================
  4001. === Function 70, subfunction 0 - read file with long names support. ==
  4002. ======================================================================
  4003. Parameters:
  4004.   * eax = 70 - function number
  4005.   * ebx = pointer to the information structure
  4006. Format of the information structure:
  4007.   * +0: dword: 0 = subfunction number
  4008.   * +4: dword: file offset (in bytes)
  4009.   * +8: dword: 0 (reserved for high dword of offset)
  4010.   * +12 = +0xC: dword: number of bytes to read
  4011.   * +16 = +0x10: dword: pointer to buffer for data
  4012.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4013.     given in the general description
  4014.     or
  4015.   * +20 = +0x14: db 0
  4016.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4017. Returned value:
  4018.   * eax = 0 - success, otherwise file system error code
  4019.   * ebx = number of read bytes or -1=0xffffffff if file was not found
  4020. Remarks:
  4021.   * If file was ended before last requested block was read,
  4022.     the function will read as many as it can, and after that return
  4023.     eax=6 (EOF).
  4024.   * The function does not allow to read folder (returns eax=10,
  4025.     access denied).
  4026.  
  4027. ======================================================================
  4028. == Function 70, subfunction 1 - read folder with long names support. =
  4029. ======================================================================
  4030. Parameters:
  4031.   * eax = 70 - function number
  4032.   * ebx = pointer to the information structure
  4033. Format of the information structure:
  4034.   * +0: dword: 1 = subfunction number
  4035.   * +4: dword: index of starting block (beginning from 0)
  4036.   * +8: dword: flags field:
  4037.     * bit 0 (mask 1): in what format to return names,
  4038.       0=ANSI, 1=UNICODE
  4039.     * other bits are reserved and must be set to 0 for the future
  4040.       compatibility
  4041.   * +12 = +0xC: dword: number of blocks to read
  4042.   * +16 = +0x10: dword: pointer to buffer for data, buffer size
  4043.     must be not less than 32 + [+12]*560 bytes
  4044.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  4045.     given in the general description
  4046.     or
  4047.   * +20 = +0x14: db 0
  4048.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4049. Returned value:
  4050.   * eax = 0 - success, otherwise file system error code
  4051.   * ebx = number of files, information on which was written to
  4052.     the buffer, or -1=0xffffffff, if folder was not found
  4053. Structure of the buffer:
  4054.   * +0: 32*byte: header
  4055.   * +32 = +0x20: n1*byte: block with information on file 1
  4056.   * +32+n1: n2*byte: block with information on file 2
  4057.   * ...
  4058. Structure of header:
  4059.   * +0: dword: version of structure (current is 1)
  4060.   * +4: dword: number of placed blocks; is not greater than requested
  4061.     in the field +12 of information structure; can be less, if
  4062.     there are no more files in folder (the same as in ebx)
  4063.   * +8: dword: total number of files in folder
  4064.   * +12 = +0xC: 20*byte: reserved (zeroed)
  4065. Structure of block of data for folder entry (BDFE):
  4066.   * +0: dword: attributes of file:
  4067.     * bit 0 (mask 1): file is read-only
  4068.     * bit 1 (mask 2): file is hidden
  4069.     * bit 2 (mask 4): file is system
  4070.     * bit 3 (mask 8): this is not a file but volume label
  4071.       (for one partition meets no more than once and
  4072.       only in root folder)
  4073.     * bit 4 (mask 0x10): this is a folder
  4074.     * bit 5 (mask 0x20): file was not archived - many archivation
  4075.       programs have an option to archive only files with this bit set,
  4076.       and after archiving this bit is cleared - it can be useful
  4077.       for automatically creating of backup-archives as at writing
  4078.       this bit is usually set
  4079.   * +4: byte: type of name data:
  4080.     (coincides with bit 0 of flags in the information structure)
  4081.     * 0 = ASCII = 1-byte representation of each character
  4082.     * 1 = UNICODE = 2-byte representation of each character
  4083.   * +5: 3*byte: reserved (zero)
  4084.   * +8: 4*byte: time of file creation
  4085.   * +12 = +0xC: 4*byte: date of file creation
  4086.   * +16 = +0x10: 4*byte: time of last access (read or write)
  4087.   * +20 = +0x14: 4*byte: date of last access
  4088.   * +24 = +0x18: 4*byte: time of last modification
  4089.   * +28 = +0x1C: 4*byte: date of last modification
  4090.   * +32 = +0x20: qword: file size in bytes (up to 16777216 Tb)
  4091.   * +40 = +0x28: name
  4092.     * for ASCII format: maximum length is 263 characters
  4093.       (263 bytes), byte after the name has value 0
  4094.     * for UNICODE format: maximum length is 259 characters
  4095.       (518 bytes), 2 bytes after the name have value 0
  4096. Time format:
  4097.   * +0: byte: seconds
  4098.   * +1: byte: minutes
  4099.   * +2: byte: hours
  4100.   * +3: byte: reserved (0)
  4101.   * for example, 23.59.59 is written as (in hex) 3B 3B 17 00
  4102. Date format:
  4103.   * +0: byte: day
  4104.   * +1: byte: month
  4105.   * +2: word: year
  4106.   * for example, 25.11.1979 is written as (in hex) 19 0B BB 07
  4107. Remarks:
  4108.   * If BDFE contains ASCII name, the length of BDFE is 304 bytes,
  4109.     if UNICODE name - 560 bytes. Value of length is aligned
  4110.     on 16-byte bound (to accelerate processing in CPU cache).
  4111.   * First character after a name is zero (ASCIIZ-string). The further
  4112.     data contain garbage.
  4113.   * If files in folder were ended before requested number was read,
  4114.     the function will read as many as it can, and after that return
  4115.     eax=6 (EOF).
  4116.   * Any folder on the disk, except for root, contains two special
  4117.     entries "." and "..", identifying accordingly the folder itself
  4118.     and the parent folder.
  4119.   * The function allows also to read virtual folders "/", "/rd",
  4120.     "/fd", "/hd[n]", thus attributes of subfolders are set to 0x10,
  4121.     and times and dates are zeroed. An alternative way to get the
  4122.     equipment information - subfunction 11 of function 18.
  4123.  
  4124. ======================================================================
  4125. ===================== Function 70, subfunction 2 =====================
  4126. ============ Create/rewrite file with long names support. ============
  4127. ======================================================================
  4128. Parameters:
  4129.   * eax = 70 - function number
  4130.   * ebx = pointer to the information structure
  4131. Format of the information structure:
  4132.   * +0: dword: 2 = subfunction number
  4133.   * +4: dword: 0 (reserved)
  4134.   * +8: dword: 0 (reserved)
  4135.   * +12 = +0xC: dword: number of bytes to read
  4136.   * +16 = +0x10: dword: pointer to data
  4137.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4138.     given in the general description
  4139.     or
  4140.   * +20 = +0x14: db 0
  4141.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4142. Returned value:
  4143.   * eax = 0 - success, otherwise file system error code
  4144.   * ebx = number of written bytes (possibly 0)
  4145. Remarks:
  4146.   * If a file with given name did not exist, it is created;
  4147.     if it existed, it is rewritten.
  4148.   * If there is not enough free space on disk, the function will
  4149.     write as many as can and then return error code 8.
  4150.   * The function is not supported for CD (returns error code 2).
  4151.  
  4152. ======================================================================
  4153. ===================== Function 70, subfunction 3 =====================
  4154. =========== Write to existing file with long names support. ==========
  4155. ======================================================================
  4156. Parameters:
  4157.   * eax = 70 - function number
  4158.   * ebx = pointer to the information structure
  4159. Format of the information structure:
  4160.   * +0: dword: 3 = subfunction number
  4161.   * +4: dword: file offset (in bytes)
  4162.   * +8: dword: high dword of offset (must be 0 for FAT)
  4163.   * +12 = +0xC: dword: number of bytes to write
  4164.   * +16 = +0x10: dword: pointer to data
  4165.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4166.     given in the general description
  4167.     or
  4168.   * +20 = +0x14: db 0
  4169.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4170. Returned value:
  4171.   * eax = 0 - success, otherwise file system error code
  4172.   * ebx = number of written bytes (possibly 0)
  4173. Remarks:
  4174.   * The file must already exist, otherwise function returns eax=5.
  4175.   * The only result of write 0 bytes is update in the file attributes
  4176.     date/time of modification and access to the current date/time.
  4177.   * If beginning and/or ending position is greater than file size
  4178.     (except for the previous case), the file is expanded to needed
  4179.     size with zero characters.
  4180.   * The function is not supported for CD (returns error code 2).
  4181.  
  4182. ======================================================================
  4183. ============ Function 70, subfunction 4 - set end of file. ===========
  4184. ======================================================================
  4185. Parameters:
  4186.   * eax = 70 - function number
  4187.   * ebx = pointer to the information structure
  4188. Format of the information structure:
  4189.   * +0: dword: 4 = subfunction number
  4190.   * +4: dword: low dword of new file size
  4191.   * +8: dword: high dword of new file size (must be 0 for FAT)
  4192.   * +12 = +0xC: dword: 0 (reserved)
  4193.   * +16 = +0x10: dword: 0 (reserved)
  4194.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4195.     given in the general description
  4196.     or
  4197.   * +20 = +0x14: db 0
  4198.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4199. Returned value:
  4200.   * eax = 0 - success, otherwise file system error code
  4201.   * ebx destroyed
  4202. Remarks:
  4203.   * If the new file size is less than old one, file is truncated.
  4204.     If the new size is greater than old one, file is expanded with
  4205.     characters with code 0. If the new size is equal to old one,
  4206.     the only result of call is set date/time of modification and
  4207.     access to the current date/time.
  4208.   * If there is not enough free space on disk for expansion, the
  4209.     function will expand to maximum possible size and then return
  4210.     error code 8.
  4211.   * The function is not supported for CD (returns error code 2).
  4212.  
  4213. ======================================================================
  4214. ==== Function 70, subfunction 5 - get information on file/folder. ====
  4215. ======================================================================
  4216. Parameters:
  4217.   * eax = 70 - function number
  4218.   * ebx = pointer to the information structure
  4219. Format of the information structure:
  4220.   * +0: dword: 5 = subfunction number
  4221.   * +4: dword: 0 (reserved)
  4222.   * +8: dword: 0 (reserved)
  4223.   * +12 = +0xC: dword: 0 (reserved)
  4224.   * +16 = +0x10: dword: pointer to buffer for data (40 bytes)
  4225.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4226.     given in the general description
  4227.     or
  4228.   * +20 = +0x14: db 0
  4229.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4230. Returned value:
  4231.   * eax = 0 - success, otherwise file system error code
  4232.   * ebx destroyed
  4233. Information on file is returned in the BDFE format (block of data
  4234. for folder entry), explained in the description of
  4235. subfunction 1, but without filename
  4236. (i.e. only first 40 = 0x28 bytes).
  4237. Remarks:
  4238.   * The function does not support virtual folders such as /, /rd and
  4239.     root folders like /rd/1.
  4240.  
  4241. ======================================================================
  4242. ===== Function 70, subfunction 6 - set attributes of file/folder. ====
  4243. ======================================================================
  4244. Parameters:
  4245.   * eax = 70 - function number
  4246.   * ebx = pointer to the information structure
  4247. Format of the information structure:
  4248.   * +0: dword: 6 = subfunction number
  4249.   * +4: dword: 0 (reserved)
  4250.   * +8: dword: 0 (reserved)
  4251.   * +12 = +0xC: dword: 0 (reserved)
  4252.   * +16 = +0x10: dword: pointer to buffer with attributes (32 bytes)
  4253.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4254.     given in the general description
  4255.     or
  4256.   * +20 = +0x14: db 0
  4257.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4258. Returned value:
  4259.   * eax = 0 - success, otherwise file system error code
  4260.   * ebx destroyed
  4261. File attributes are first 32 bytes in BDFE (block of data
  4262. for folder entry), explained in the description of subfunction 1
  4263. (that is, without name and size of file). Attribute
  4264. file/folder/volume label (bits 3,4 in dword +0) is not changed.
  4265. Byte +4 (name format) is ignored.
  4266. Remarks:
  4267.   * The function does not support virtual folders such as /, /rd and
  4268.     root folders like /rd/1.
  4269.   * The function is not supported for CD (returns error code 2).
  4270.  
  4271. ======================================================================
  4272. =========== Function 70, subfunction 7 - start application. ==========
  4273. ======================================================================
  4274. Parameters:
  4275.   * eax = 70 - function number
  4276.   * ebx = pointer to the information structure
  4277. Format of the information structure:
  4278.   * +0: dword: 7 = subfunction number
  4279.   * +4: dword: flags field:
  4280.     * сшЄ 0: start process as debugged
  4281.     * other bits are reserved and must be set to 0
  4282.   * +8: dword: 0 or pointer to ASCIIZ-string with parameters
  4283.   * +12 = +0xC: dword: 0 (reserved)
  4284.   * +16 = +0x10: dword: 0 (reserved)
  4285.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4286.     given in the general description
  4287.     or
  4288.   * +20 = +0x14: db 0
  4289.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4290. Returned value:
  4291.   * eax > 0 - program is loaded, eax contains PID
  4292.   * eax < 0 - an error has occured, -eax contains
  4293.     file system error code
  4294.   * ebx destroyed
  4295. Remarks:
  4296.   * Command line must be terminated by the character with the code 0
  4297.     (ASCIIZ-string); function takes into account either all characters
  4298.     up to terminating zero inclusively or first 256 character
  4299.     regarding what is less.
  4300.   * If the process is started as debugged, it is created in
  4301.     the suspended state; to run use subfunction 5 of function 69.
  4302.  
  4303. ======================================================================
  4304. ========== Function 70, subfunction 8 - delete file/folder. ==========
  4305. ======================================================================
  4306. Parameters:
  4307.   * eax = 70 - function number
  4308.   * ebx = pointer to the information structure
  4309. Format of the information structure:
  4310.   * +0: dword: 8 = subfunction number
  4311.   * +4: dword: 0 (reserved)
  4312.   * +8: dword: 0 (reserved)
  4313.   * +12 = +0xC: dword: 0 (reserved)
  4314.   * +16 = +0x10: dword: 0 (reserved)
  4315.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4316.     given in the general description
  4317.     or
  4318.   * +20 = +0x14: db 0
  4319.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4320. Returned value:
  4321.   * eax = 0 - success, otherwise file system error code
  4322.   * ebx destroyed
  4323. Remarks:
  4324.   * The function is not supported for CD (returns error code 2).
  4325.   * The function can delete only empty folders (attempt to delete
  4326.     nonempty folder results in error with code 10, "access denied").
  4327.  
  4328. ======================================================================
  4329. ============= Function 70, subfunction 9 - create folder. ============
  4330. ======================================================================
  4331. Parameters:
  4332.   * eax = 70 - function number
  4333.   * ebx = pointer to the information structure
  4334. Format of the information structure:
  4335.   * +0: dword: 9 = subfunction number
  4336.   * +4: dword: 0 (reserved)
  4337.   * +8: dword: 0 (reserved)
  4338.   * +12 = +0xC: dword: 0 (reserved)
  4339.   * +16 = +0x10: dword: 0 (reserved)
  4340.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  4341.     given in the general description
  4342.     or
  4343.   * +20 = +0x14: db 0
  4344.   * +21 = +0x15: dd pointer to ASCIIZ-string with folder name
  4345. Returned value:
  4346.   * eax = 0 - success, otherwise file system error code
  4347.   * ebx destroyed
  4348. Remarks:
  4349.   * The function is not supported for CD (returns error code 2).
  4350.   * The parent folder must already exist.
  4351.   * If target folder already exists, function returns success (eax=0).
  4352.  
  4353. ======================================================================
  4354. ========== Function 71, subfunction 1 - set window caption. ==========
  4355. ======================================================================
  4356. Parameters:
  4357.   * eax = 71 - function number
  4358.   * ebx = 1 - subfunction number
  4359.   * ecx = pointer to caption string
  4360. Returned value:
  4361.   * function does not return value
  4362. Remarks:
  4363.   * String must be in the ASCIIZ-format. Disregarding real string
  4364.     length, no more than 255 characters are drawn.
  4365.   * Pass NULL in ecx to remove caption.
  4366.  
  4367. ======================================================================
  4368. =============== Function 72 - send message to a window. ==============
  4369. ======================================================================
  4370.  
  4371. - Subfunction 1 - send message with parameter to the active window. --
  4372. Parameters:
  4373.   * eax = 72 - function number
  4374.   * ebx = 1 - subfunction number
  4375.   * ecx = event code: 2 or 3
  4376.   * edx = parameter: key code for ecx=2, button identifier for ecx=3
  4377. Returned value:
  4378.   * eax = 0 - success
  4379.   * eax = 1 - buffer is full