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  1. SYSTEM FUNCTIONS of OS Kolibri 0.7.1.0
  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.   * At current implementation there will be an immediate return from
  223.     the function, if the addition of ebx with current value of
  224.     time counter will call 32-bit overflow.
  225.  
  226. ======================================================================
  227. ============== Function 6 - read the file from ramdisk. ==============
  228. ======================================================================
  229. Parameters:
  230.   * eax = 6 - function number
  231.   * ebx = pointer to the filename
  232.   * ecx = number of start block, beginning from 1;
  233.     ecx=0 - read from the beginning of the file (same as ecx=1)
  234.   * edx = number of blocks to read;
  235.     edx=0 - read one block (same as edx=1)
  236.   * esi = pointer to memory area for the data
  237. Returned value:
  238.   * eax = file size in bytes, if the file was successfully read
  239.   * eax = -1, if the file was not found
  240. Remarks:
  241.   * This function is out-of-date; function 70 allows
  242.     to fulfil the same operations with the extended possibilities.
  243.   * Block = 512 bytes.
  244.   * For reading all file you can specify the certainly large value
  245.     in edx, for example, edx = -1; but in this case be ready that
  246.     the program will "fall", if the file will appear too large and can
  247.     not be placed in the program memory.
  248.   * The filename must be either in the format 8+3 characters
  249.     (first 8 characters - name itself, last 3 - extension,
  250.     the short names and extensions are supplemented with spaces),
  251.     or in the format 8.3 characters "FILE.EXT"/"FILE.EX "
  252.     (name no more than 8 characters, dot, extension 3 characters
  253.     supplemented if necessary by spaces).
  254.     The filename must be written with capital letters. The terminating
  255.     character with code 0 is not necessary (not ASCIIZ-string).
  256.   * This function does not support folders on the ramdisk.
  257.  
  258. ======================================================================
  259. =============== Function 7 - draw image in the window. ===============
  260. ======================================================================
  261. Paramters:
  262.   * eax = 7 - function number
  263.   * ebx = pointer to the image in the format BBGGRRBBGGRR...
  264.   * ecx = [size on axis x]*65536 + [size on axis y]
  265.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  266. Returned value:
  267.   * function does not return value
  268. Remarks:
  269.   * Coordinates of the image are coordinates of the upper left corner
  270.     of the image relative to the window.
  271.   * Size of the image in bytes is 3*xsize*ysize.
  272.  
  273. ======================================================================
  274. =============== Function 8 - define/delete the button. ===============
  275. ======================================================================
  276. Parameters for button definition:
  277.   * eax = 8 - function number
  278.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  279.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  280.   * edx = 0xXYnnnnnn, where:
  281.     * nnnnnn = identifier of the button
  282.     * high (31st) bit of edx is cleared
  283.     * if 30th bit of edx is set - do not draw the button
  284.     * if 29th bit of edx is set - do not draw a frame
  285.       at pressing the button
  286.   * esi = 0x00RRGGBB - color of the button
  287. Parameters for button deleting:
  288.   * eax = 8 - function number
  289.   * edx = 0x80nnnnnn, where nnnnnn - identifier of the button
  290. Returned value:
  291.   * function does not return value
  292. Remarks:
  293.   * Sizes of the button must be more than 0 and less than 0x8000.
  294.   * For skinned windows definition of the window
  295.     (call of 0th function) creates two standard buttons -
  296.     for close of the window with identifier 1 and
  297.     for minimize of the window with identifier 0xffff.
  298.   * The creation of two buttons with same identifiers is admitted.
  299.   * The button with the identifier 0xffff at pressing is interpreted
  300.     by the system as the button of minimization, the system handles
  301.     such pressing independently, not accessing to the application.
  302.     In rest it is usual button.
  303.   * Total number of buttons for all applications is limited to 4095.
  304.  
  305. ======================================================================
  306. ============ Function 9 - information on execution thread. ===========
  307. ======================================================================
  308. Parameters:
  309.   * eax = 9 - function number
  310.   * ebx = pointer to 1-Kb buffer
  311.   * ecx = number of the slot of the thread
  312.     ecx = -1 - get information on the current thread
  313. Returned value:
  314.   * eax = maximum number of the slot of a thread
  315.   * buffer pointed to by ebx contains the following information:
  316.     * +0: dword: usage of the processor (how many time units
  317.       per second leaves on execution of this thread)
  318.     * +4: word: position of the window of thread in the window stack
  319.     * +6: word: (has no relation to the specified thread)
  320.       number of the thread slot, which window has in the window stack
  321.       position ecx
  322.     * +8: word: reserved
  323.     * +10 = +0xA: 11 bytes: name of the process
  324.       (name of corresponding executable file in the format 8+3)
  325.     * +21 = +0x15: byte: reserved, this byte is not changed
  326.     * +22 = +0x16: dword: address of the process in memory
  327.     * +26 = +0x1A: dword: size of used memory - 1
  328.     * +30 = +0x1E: dword: identifier (PID/TID)
  329.     * +34 = +0x22: dword: coordinate of the thread window on axis x
  330.     * +38 = +0x26: dword: coordinate of the thread window on axis y
  331.     * +42 = +0x2A: dword: size of the thread window on axis x
  332.     * +46 = +0x2E: dword: size of the thread window on axis y
  333.     * +50 = +0x32: word: status of the thread slot:
  334.       * 0 = thread is running
  335.       * 1 = thread is suspended
  336.       * 2 = thread is suspended while waiting for event
  337.       * 3 = thread is terminating as a result of call to function -1
  338.         or under duress as a result of call to subfunction 2
  339.         of function 18 or termination of the system
  340.       * 4 = thread is terminating as a result of exception
  341.       * 5 = thread waits for event
  342.       * 9 = requested slot is free, all other information on the slot
  343.         is not meaningful
  344.     * +52 = +0x34: word: reserved, this word is not changed
  345.     * +54 = +0x36: dword: coordinate of the client area on axis x
  346.     * +58 = +0x3A: dword: coordinate of the client area on axis y
  347.     * +62 = +0x3E: dword: width of the client area
  348.     * +66 = +0x42: dword: height of the client area
  349.     * +70 = +0x46: byte: state of the window - bitfield
  350.       * bit 0 (mask 1): window is maximized
  351.       * bit 1 (mask 2): window is minimized to panel
  352.       * bit 2 (mask 4): window is rolled up
  353. Remarks:
  354.   * Slots are numbered starting from 1.
  355.   * Returned value is not a total number of threads, because there
  356.     can be free slots.
  357.   * When process is starting, system automatically creates
  358.     execution thread.
  359.   * Function gives information on the thread. Each process has
  360.     at least one thread. One process can create many threads,
  361.     in this case each thread has its own slot and the fields
  362.     +10, +22, +26 in these slots coincide.
  363.     Applications have no common way to define whether two threads
  364.     belong to one process.
  365.   * The active window - window on top of the window stack -
  366.     receives the messages on a keyboard input. For such window
  367.     the position in the window stack coincides with returned value.
  368.   * Slot 1 corresponds to special system thread, for which:
  369.     * the window is in the bottom of the window stack, the fields
  370.       +4 and +6 contain value 1
  371.     * name of the process - "OS/IDLE" (supplemented by spaces)
  372.     * address of the process in memory is 0, size of used memory is
  373.       16 Mb (0x1000000)
  374.     * PID=1
  375.     * coordinates and sizes of the window and the client area are by
  376.       convention set to 0
  377.     * status of the slot is always 0 (running)
  378.     * the execution time adds of time leaving on operations itself
  379.       and idle time in waiting for interrupt (which can be got by call
  380.       to subfunction 4 of function 18).
  381.   * Beginning from slot 2, the normal applications are placed.
  382.   * The normal applications are placed in memory at the address
  383.     0x60400000 (kernel constant 'std_application_base_address').
  384.     There is no intersection, as each process has its own page table.
  385.   * At creation of the thread it is assigned the slot
  386.     in the system table and identifier (Process/Thread IDentifier =
  387.     PID/TID), which do not vary with time for given thread.
  388.     After completion of the thread its slot can be anew used
  389.     for another thread. The thread identifier can not be assigned
  390.     to other thread even after completion of this thread.
  391.     Identifiers, assigned to new threads, grow monotonously.
  392.   * If the thread has not yet defined the window by call to
  393.     function 0, the position and the sizes
  394.     of its window are considered to be zero.
  395.   * Coordinates of the client area are relative to the window.
  396.   * At the moment only the part of the buffer by a size
  397.     71 = 0x37 bytes is used. Nevertheless it is recommended to use
  398.     1-Kb buffer for the future compatibility, in the future
  399.     some fields can be added.
  400.  
  401. ======================================================================
  402. ==================== Function 10 - wait for event. ===================
  403. ======================================================================
  404. If the message queue is empty, waits for appearance of the message
  405. in queue. In this state thread does not consume CPU time.
  406. Then reads out the message from queue.
  407.  
  408. Parameters:
  409.   * eax = 10 - function number
  410. Returned value:
  411.   * eax = event (see the list of events)
  412. Remarks:
  413.   * Those events are taken into account only which enter into
  414.     a mask set by function 40. By default it is
  415.     redraw, key and button events.
  416.   * To check, whether there is a message in queue, use function 11.
  417.     To wait for no more than given time, use function 23.
  418.  
  419. ======================================================================
  420. =============== Function 11 - check for event, no wait. ==============
  421. ======================================================================
  422. If the message queue contains event, function reads out
  423. and return it. If the queue is empty, function returns 0.
  424. Parameters:
  425.   * eax = 11 - function number
  426. Returned value:
  427.   * eax = 0 - message queue is empty
  428.   * else eax = event (see the list of events)
  429. Remarks:
  430.   * Those events are taken into account only, which enter into
  431.     a mask set by function 40. By default it is
  432.     redraw, key and button events.
  433.   * To wait for event, use function 10.
  434.     To wait for no more than given time, use function 23.
  435.  
  436. ======================================================================
  437. =============== Function 12 - begin/end window redraw. ===============
  438. ======================================================================
  439.  
  440. ---------------- Subfunction 1 - begin window redraw. ----------------
  441. Parameters:
  442.   * eax = 12 - function number
  443.   * ebx = 1 - subfunction number
  444. Returned value:
  445.   * function does not return value
  446.  
  447. ----------------- Subfunction 2 - end window redraw. -----------------
  448. Parameters:
  449.   * eax = 12 - function number
  450.   * ebx = 2 - subfunction number
  451. Returned value:
  452.   * function does not return value
  453. Remarks:
  454.   * Subfunction 1 deletes all buttons defined with
  455.     function 8, they must be defined again.
  456.  
  457. ======================================================================
  458. ============ Function 13 - draw a rectangle in the window. ===========
  459. ======================================================================
  460. Parameters:
  461.   * eax = 13 - function number
  462.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  463.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  464.   * edx = color 0xRRGGBB or 0x80RRGGBB for gradient fill
  465. Returned value:
  466.   * function does not return value
  467. Remarks:
  468.   * Coordinates are understood as coordinates of the left upper corner
  469.     of a rectangle relative to the window.
  470.  
  471. ======================================================================
  472. =================== Function 14 - get screen size. ===================
  473. ======================================================================
  474. Parameters:
  475.   * eax = 14 - function number
  476. Returned value:
  477.   * eax = [xsize]*65536 + [ysize], where
  478.   * xsize = x-coordinate of the right lower corner of the screen =
  479.             horizontal size - 1
  480.   * ysize = y-coordinate of the right lower corner of the screen =
  481.             vertical size - 1
  482. Remarks:
  483.   * See also subfunction 5 of function 48 - get sizes of
  484.     working area of the screen.
  485.  
  486. ======================================================================
  487. == Function 15, subfunction 1 - set a size of the background image. ==
  488. ======================================================================
  489. Parameters:
  490.   * eax = 15 - function number
  491.   * ebx = 1 - subfunction number
  492.   * ecx = width of the image
  493.   * edx = height of the image
  494. Returned value:
  495.   * function does not return value
  496. Remarks:
  497.   * Before calling subfunctions 2 and 5 you should call this function
  498.     to set image size!
  499.   * For update of the screen (after completion of a series of commands
  500.     working with a background) call subfunction 3.
  501.   * There is a pair function for get size of the background image -
  502.     subfunction 1 of function 39.
  503.  
  504. ======================================================================
  505. === Function 15, subfunction 2 - put pixel on the background image. ==
  506. ======================================================================
  507. Parameters:
  508.   * eax = 15 - function number
  509.   * ebx = 2 - subfunction number
  510.   * ecx = offset
  511.   * edx = color of a pixel 0xRRGGBB
  512. Returned value:
  513.   * function does not return value
  514. Remarks:
  515.   * Offset for a pixel with coordinates (x,y) is calculated as
  516.     (x+y*xsize)*3.
  517.   * If the given offset exceeds size set by subfunction 1,
  518.     the call is ignored.
  519.   * For update of the screen (after completion of a series of commands
  520.     working with a background) call subfunction 3.
  521.   * There is a pair function for get pixel on the background image -
  522.     subfunction 2 of function 39.
  523.  
  524. ======================================================================
  525. =========== Function 15, subfunction 3 - redraw background. ==========
  526. ======================================================================
  527. Parameters:
  528.   * eax = 15 - function number
  529.   * ebx = 3 - subfunction number
  530. Returned value:
  531.   * function does not return value
  532.  
  533. ======================================================================
  534. == Function 15, subfunction 4 - set drawing mode for the background. =
  535. ======================================================================
  536. Parameters:
  537.   * eax = 15 - function number
  538.   * ebx = 4 - subfunction number
  539.   * ecx = drawing mode:
  540.     * 1 = tile
  541.     * 2 = stretch
  542. Returned value:
  543.   * function does not return value
  544. Remarks:
  545.   * For update of the screen (after completion of a series of commands
  546.     working with a background) call subfunction 3.
  547.   * There is a pair function for get drawing mode of the background -
  548.     subfunction 4 of function 39.
  549.  
  550. ======================================================================
  551. ===================== Function 15, subfunction 5 =====================
  552. ============ Put block of pixels on the background image. ============
  553. ======================================================================
  554. Parameters:
  555.   * eax = 15 - function number
  556.   * ebx = 5 - subfunction number
  557.   * ecx = pointer to the data in the format BBGGRRBBGGRR...
  558.   * edx = offset in data of the background image
  559.   * esi = size of data in bytes = 3 * number of pixels
  560. Returned value:
  561.   * function does not return value
  562. Remarks:
  563.   * Offset and size are not checked for correctness.
  564.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  565.   * Pixels of the background image are written sequentially
  566.     from left to right, from up to down.
  567.   * Offset of pixel with coordinates (x,y) is (x+y*xsize)*3.
  568.   * For update of the screen (after completion of a series of commands
  569.     working with a background) call subfunction 3.
  570.  
  571. ======================================================================
  572. ===================== Function 15, subfunction 6 =====================
  573. ======== Map background data to the address space of process. ========
  574. ======================================================================
  575. Parameters:
  576.   * eax = 15 - function number
  577.   * ebx = 6 - subfunction number
  578. Returned value:
  579.   * eax = pointer to background data, 0 if error
  580. Remarks:
  581.   * Mapped data are available for read and write.
  582.   * Size of background data is 3*xsize*ysize. The system blocks
  583.     changes of background sizes while process works with mapped data.
  584.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  585.   * Pixels of the background image are written sequentially
  586.     from left to right, from up to down.
  587.  
  588. ======================================================================
  589. ===== Function 15, subfunction 7 - close mapped background data. =====
  590. ======================================================================
  591. Parameters:
  592.   * eax = 15 - function number
  593.   * ebx = 7 - subfunction number
  594.   * ecx = pointer to mapped data
  595. Returned value:
  596.   * eax = 1 - success, 0 - error
  597.  
  598. ======================================================================
  599. =============== Function 16 - save ramdisk on a floppy. ==============
  600. ======================================================================
  601. Parameters:
  602.   * eax = 16 - function number
  603.   * ebx = 1 or ebx = 2 - on which floppy save
  604. Returned value:
  605.   * eax = 0 - success
  606.   * eax = 1 - error
  607.  
  608. ======================================================================
  609. ======= Function 17 - get the identifier of the pressed button. ======
  610. ======================================================================
  611. Takes away the code of the pressed button from the buffer.
  612. Parameters:
  613.   * eax = 17 - function number
  614. Returned value:
  615.   * if the buffer is empty, function returns eax=1
  616.   * if the buffer is not empty, function returns al=0,
  617.     high 24 bits of eax contain button identifier (in particular, ah
  618.     contains low byte of the identifier; if all buttons have
  619.     the identifier less than 256, ah is enough to distinguish).
  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.  
  626. ======================================================================
  627. = Function 18, subfunction 2 - terminate process/thread by the slot. =
  628. ======================================================================
  629. Parameters:
  630.   * eax = 18 - function number
  631.   * ebx = 2 - subfunction number
  632.   * ecx = number of the slot of process/thread
  633. Returned value:
  634.   * function does not return value
  635. Remarks:
  636.   * It is impossible to terminate system thread OS/IDLE (with
  637.     number of the slot 1),
  638.     it is possible to terminate any normal process/thread.
  639.   * See also subfunction 18 - terminate
  640.     process/thread by the identifier.
  641.  
  642. ======================================================================
  643. ===================== Function 18, subfunction 3 =====================
  644. ============= Make active the window of the given thread. ============
  645. ======================================================================
  646. Parameters:
  647.   * eax = 18 - function number
  648.   * ebx = 3 - subfunction number
  649.   * ecx = number of the thread slot
  650. Returned value:
  651.   * function does not return value
  652. Remarks:
  653.   * If correct, but nonexistent slot is given,
  654.     some window is made active.
  655.   * To find out, which window is active, use subfunction 7.
  656.  
  657. ======================================================================
  658. ===================== Function 18, subfunction 4 =====================
  659. =========== Get counter of idle time units per one second. ===========
  660. ======================================================================
  661. Idle time units are units, in which the processor stands idle
  662. in waiting for interrupt (in the command 'hlt').
  663.  
  664. Parameters:
  665.   * eax = 18 - function number
  666.   * ebx = 4 - subfunction number
  667. Returned value:
  668.   * eax = value of the counter of idle time units per one second
  669.  
  670. ======================================================================
  671. ========== Function 18, subfunction 5 - get CPU clock rate. ==========
  672. ======================================================================
  673. Parameters:
  674.   * eax = 18 - function number
  675.   * ebx = 5 - subfunction number
  676. Returned value:
  677.   * eax = clock rate (modulo 2^32 clock ticks = 4GHz)
  678.  
  679. ======================================================================
  680.  Function 18, subfunction 6 - save ramdisk to the file on hard drive.
  681. ======================================================================
  682. Parameters:
  683.   * eax = 18 - function number
  684.   * ebx = 6 - subfunction number
  685.   * ecx = pointer to the full path to file
  686.     (for example, "/hd0/1/kolibri/kolibri.img")
  687. Returned value:
  688.   * eax = 0 - success
  689.   * else eax = error code of the file system
  690. Remarks:
  691.   * All folders in the given path must exist, otherwise function
  692.     returns value 5, "file not found".
  693.  
  694. ======================================================================
  695. =========== Function 18, subfunction 7 - get active window. ==========
  696. ======================================================================
  697. Parameters:
  698.   * eax = 18 - function number
  699.   * ebx = 7 - subfunction number
  700. Returned value:
  701.   * eax = number of the active window
  702.     (number of the slot of the thread with active window)
  703. Remarks:
  704.   * Active window is at the top of the window stack and receives
  705.     messages on all keyboard input.
  706.   * To make a window active, use subfunction 3.
  707.  
  708. ======================================================================
  709. == Function 18, subfunction 8 - disable/enable the internal speaker. =
  710. ======================================================================
  711. If speaker sound is disabled, all calls to subfunction 55 of
  712. function 55 are ignored. If speaker sound is enabled,
  713. they are routed on builtin speaker.
  714.  
  715. ------------------- Subsubfunction 1 - get status. -------------------
  716. Parameters:
  717.   * eax = 18 - function number
  718.   * ebx = 8 - subfunction number
  719.   * ecx = 1 - number of the subsubfunction
  720. Returned value:
  721.   * eax = 0 - speaker sound is enabled; 1 - disabled
  722.  
  723. ----------------- Subsubfunction 2 - toggle status. ------------------
  724. Toggles states of disable/enable.
  725. Parameters:
  726.   * eax = 18 - function number
  727.   * ebx = 8 - subfunction number
  728.   * ecx = 2 - number of the subsubfunction
  729. Returned value:
  730.   * function does not return value
  731.  
  732. ======================================================================
  733. ============ Function 18, subfunction 9 - system shutdown. ===========
  734. ======================================================================
  735. Parameters:
  736.   * eax = 18 - function number
  737.   * ebx = 9 - subfunction number
  738.   * ecx = parameter:
  739.     * 2 = turn off computer
  740.     * 3 = reboot computer
  741.     * 4 = restart the kernel from the file 'kernel.mnt' on ramdisk
  742. Returned value:
  743.   * at incorrect ecx the registers do not change (i.e. eax=18)
  744.   * by correct call function always returns eax=0
  745.     as the tag of success
  746. Remarks:
  747.   * Do not rely on returned value by incorrect call, it can be
  748.     changed in future versions of the kernel.
  749.   * It is possible to use subfunction 1, that on the last step
  750.     the user makes choice himself.
  751. ======================================================================
  752. ===== Function 18, subfunction 10 - minimize application window. =====
  753. ======================================================================
  754. Minimizes the own window.
  755. Parameters:
  756.   * eax = 18 - function number
  757.   * ebx = 10 - subfunction number
  758. Returned value:
  759.   * function does not return value
  760. Remarks:
  761.   * The minimized window from the point of view of function 9
  762.     keeps position and sizes.
  763.   * Restoring of an application window occurs at its activation by
  764.     subfunction 3.
  765.   * Usually there is no necessity to minimize/restire a window
  766.     obviously: minimization of a window is carried out by the system
  767.     at pressing the minimization button (for skinned windows
  768.     it is defined automatically by function 0,
  769.     for other windows it can be defined manually by function 8),
  770.     restore of a window is done by the application '@panel'.
  771.  
  772. ======================================================================
  773.  Function 18, subfunction 11 - get information on the disk subsystem.
  774. ======================================================================
  775. Parameters:
  776.   * eax = 18 - function number
  777.   * ebx = 11 - subfunction number
  778.   * ecx = type of the table:
  779.     * 1 = short version, 10 bytes
  780.     * 2 = full version, 65536 bytes
  781.   * edx = pointer to the buffer (in the application) for the table
  782. Returned value:
  783.   * function does not return value
  784. Format of the table: short version:
  785.   * +0: byte: information about FDD's (drives for floppies),
  786.     AAAABBBB, where AAAA gives type of the first drive, BBBB -
  787.     of the second regarding to the following list:
  788.     * 0 = there is no drive
  789.     * 1 = 360Kb, 5.25''
  790.     * 2 = 1.2Mb, 5.25''
  791.     * 3 = 720Kb, 3.5''
  792.     * 4 = 1.44Mb, 3.5''
  793.     * 5 = 2.88Mb, 3.5'' (such drives are not used anymore)
  794.     For example, for the standard configuration from one 1.44-drive
  795.     here will be 40h, and for the case 1.2Mb on A: and 1.44Mb on B:
  796.     the value is 24h.
  797.   * +1: byte: information about hard disks and CD-drives, AABBCCDD,
  798.     where AA corresponds to the controller IDE0, ..., DD - IDE3:
  799.     * 0 = device is absent
  800.     * 1 = hard drive
  801.     * 2 = CD-drive
  802.     For example, in the case HD on IDE0 and CD on IDE2
  803.     this field contains 48h.
  804.   * +2: 4 db: number of the retrieved partitions on hard disks
  805.     at accordingly IDE0,...,IDE3.
  806.     If the hard disk on IDEx is absent, appropriate byte is zero,
  807.     otherwise it shows number of the recognized partitions, which
  808.     can be not presented (if the drive is not formatted or if
  809.     the file system is not supported). Current version of the kernel
  810.     supports only FAT16, FAT32 and NTFS for hard disks.
  811.   * +6: 4 db: reserved
  812. Format of the table: full version:
  813.   * +0: 10 db: same as for the short version
  814.   * +10: 100 db: data for the first partition
  815.   * +110: 100 db: data for the second partition
  816.   * ...
  817.   * +10+100*(n-1): 100 db: data for the last partition
  818. The partitions are located as follows: at first sequentially all
  819. recoginzed partitions on HD on IDE0 (if present),
  820. then on HD on IDE1 (if present) and so on up to IDE3.
  821. Format of the information about partition
  822. (at moment only FAT is supported):
  823.   * +0: dword: first physical sector of the partition
  824.   * +4: dword: last physical sector of the partition
  825.     (belongs to the partition)
  826.   * +8: byte: file system type:
  827.     16=FAT16, 32=FAT32, 1=NTFS
  828.   * other data are dependent on file system, are modified with
  829.     kernel modifications and therefore are not described
  830. Remarks:
  831.   * The short table can be used for obtaining the information about
  832.     available devices.
  833.  
  834. ======================================================================
  835. ========== Function 18, subfunction 13 - get kernel version. =========
  836. ======================================================================
  837. Parameters:
  838.   * eax = 18 - function number
  839.   * ebx = 13 - subfunction number
  840.   * ecx = pointer to the buffer (not less than 16 bytes), where
  841.     the information will be placed
  842. Returned value:
  843.   * function does not return value
  844. Structure of the buffer:
  845. db a,b,c,d for version a.b.c.d
  846. db UID_xxx: one of UID_NONE=0, UID_MENUET=1, UID_KOLIBRI=2
  847. dd REV - kernel SVN revision number
  848. For Kolibri 0.7.1.0 kernel:
  849. db 0,7,0,0
  850. db 2
  851. dd 638
  852.  
  853. ======================================================================
  854. ======= Function 18, subfunction 14 - wait for screen retrace. =======
  855. ======================================================================
  856. Waits for the beginning of retrace of the scanning ray of the screen
  857. monitor.
  858. Parameters:
  859.   * eax = 18 - function number
  860.   * ebx = 14 - subfunction number
  861. Returned value:
  862.   * eax = 0 as the tag of success
  863. Remarks:
  864.   * Function is intended only for active high-efficiency graphics
  865.     applications; is used for smooth output of a graphics.
  866.  
  867. ======================================================================
  868. == Function 18, subfunction 15 - center mouse cursor on the screen. ==
  869. ======================================================================
  870. Parameters:
  871.   * eax = 18 - function number
  872.   * ebx = 15 - subfunction number
  873. Returned value:
  874.   * eax = 0 as the tag of success
  875.  
  876. ======================================================================
  877. ========= Function 18, subfunction 16 - get size of free RAM. ========
  878. ======================================================================
  879. Parameters:
  880.   * eax = 18 - function number
  881.   * ebx = 16 - subfunction number
  882. Returned value:
  883.   * eax = size of free memory in kilobytes
  884.  
  885. ======================================================================
  886. ======== Function 18, subfunction 17 - get full amount of RAM. =======
  887. ======================================================================
  888. Parameters:
  889.   * eax = 18 - function number
  890.   * ebx = 17 - subfunction number
  891. Returned value:
  892.   * eax = total size of existing memory in kilobytes
  893.  
  894. ======================================================================
  895. ===================== Function 18, subfunction 18 ====================
  896. ============= Terminate process/thread by the identifier. ============
  897. ======================================================================
  898. Parameters:
  899.   * eax = 18 - function number
  900.   * ebx = 18 - subfunction number
  901.   * ecx = identifer of process/thread (PID/TID)
  902. Returned value:
  903.   * eax = 0 - success
  904.   * eax = -1 - error (process is not found or is system)
  905. Remarks:
  906.   * It is impossible to terminate system thread OS/IDLE (identifier
  907.     1), it is possible to terminate any normal process/thread.
  908.   * See also subfunction 2 - terminate
  909.     process/thread by given slot.
  910.  
  911. ======================================================================
  912. ======== Function 18, subfunction 19 - get/set mouse features. =======
  913. ======================================================================
  914.  
  915. ---------------- Subsubfunction 0 - get mouse speed. -----------------
  916. Parameters:
  917.   * eax = 18 - function number
  918.   * ebx = 19 - subfunction number
  919.   * ecx = 0 - subsubfunction number
  920. Returned value:
  921.   * eax = current mouse speed
  922.  
  923. ---------------- Subsubfunction 1 - set mouse speed. -----------------
  924. Parameters:
  925.   * eax = 18 - function number
  926.   * ebx = 19 - subfunction number
  927.   * ecx = 1 - subsubfunction number
  928.   * edx = new value for speed
  929. Returned value:
  930.   * function does not return value
  931.  
  932. ---------------- Subsubfunction 2 - get mouse delay. -----------------
  933. Parameters:
  934.   * eax = 18 - function number
  935.   * ebx = 19 - subfunction number
  936.   * ecx = 2 - subsubfunction number
  937. Returned value:
  938.   * eax = current mouse delay
  939.  
  940. ---------------- Subsubfunction 3 - set mouse delay. -----------------
  941. Parameters:
  942.   * eax = 18 - function number
  943.   * ebx = 19 - subfunction number
  944.   * ecx = 3 - subsubfunction number
  945.   * edx = new value for mouse delay
  946. Returned value:
  947.   * function does not return value
  948.  
  949. ----------- Subsubfunction 4 - set mouse pointer position. -----------
  950. Parameters:
  951.   * eax = 18 - function number
  952.   * ebx = 19 - subfunction number
  953.   * ecx = 4 - subsubfunction number
  954.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  955. Returned value:
  956.   * function does not return value
  957.  
  958. -------- Subsubfunction 5 - simulate state of mouse buttons. ---------
  959. Parameters:
  960.   * eax = 18 - function number
  961.   * ebx = 19 - subfunction number
  962.   * ecx = 5 - subsubfunction number
  963.   * edx = information about emulated state of mouse buttons:
  964.     (same as return value in subfunction 2 of function 37)
  965.     * bit 0 is set = left button is pressed
  966.     * bit 1 is set = right button is pressed
  967.     * bit 2 is set = middle button is pressed
  968.     * bit 3 is set = 4th button is pressed
  969.     * bit 4 is set = 5th button is pressed
  970. Returned value:
  971.   * function does not return value
  972. Remarks:
  973.   * It is recommended to set speed of the mouse (in subsubfunction 1)
  974.     from 1 up to 9. The installed value is not inspected by the kernel
  975.     code, so set it carefully, at incorrect value the cursor
  976.     can "freeze". Speed of the mouse can be regulated through the
  977.     application SETUP.
  978.   * Recommended delay of the mouse (in subsubfunction 3) = 10. Lower
  979.     value is not handled by COM mice. At the very large values the
  980.     movement of the mouse on 1 pixel is impossible and the cursor will
  981.     jump on the value of installed speed (subsubfunction 1). The
  982.     installed value is not inspected by the kernel code.
  983.     Mouse delay can be regulated through the application SETUP.
  984.   * The subsubfunction 4 does not check the passed value. Before
  985.     its call find out current screen resolution (with function 14)
  986.     and check that the value of position is inside the limits of the
  987.     screen.
  988.  
  989. ======================================================================
  990. ======== Function 18, subfunction 20 - get information on RAM. =======
  991. ======================================================================
  992. Parameters:
  993.   * eax = 18 - function number
  994.   * ebx = 20 - subfunction number
  995.   * ecx = pointer to the buffer for information (36 bytes)
  996. Returned value:
  997.   * eax = total size of existing RAM in pages
  998.     or -1 if error has occured
  999.   * buffer pointed to by ecx contains the following information:
  1000.     * +0:  dword: total size of existing RAM in pages
  1001.     * +4:  dword: size of free RAM in pages
  1002.     * +8:  dword: number of page faults (exceptions #PF)
  1003.                  in applications
  1004.     * +12: dword: size of kernel heap in bytes
  1005.     * +16: dword: free in kernel heap in bytes
  1006.     * +20: dword: total number of memory blocks in kernel heap
  1007.     * +24: dword: number of free memory blocks in kernel heap
  1008.     * +28: dword: size of maximum free block in kernel heap
  1009.                  (reserved)
  1010.     * +32: dword: size of maximum allocated block in kernel heap
  1011.                  (reserved)
  1012.  
  1013. ======================================================================
  1014. ===================== Function 18, subfunction 21 ====================
  1015. ======== Get slot number of process/thread by the identifier. ========
  1016. ======================================================================
  1017. Parameters:
  1018.   * eax = 18 - function number
  1019.   * ebx = 21 - subfunction number
  1020.   * ecx = identifer of process/thread (PID/TID)
  1021. Returned value:
  1022.   * eax = 0 - error (invalid identifier)
  1023.   * otherwise eax = slot number
  1024.  
  1025. ======================================================================
  1026. ===================== Function 18, subfunction 22 ====================
  1027. ============== Operations with window of another thread. =============
  1028. ======================================================================
  1029. Parameters:
  1030.   * eax = 18 - function number
  1031.   * ebx = 22 - subfunction number
  1032.   * ecx = operation type:
  1033.     * 0 = minimize window of the thread with given slot number
  1034.     * 1 = minimize window of the thread with given identifier
  1035.     * 2 = restore window of the thread with given slot number
  1036.     * 3 = restore window of the thread with given identifier
  1037.   * edx = parameter (slot number or PID/TID)
  1038. Returned value:
  1039.   * eax = 0 - success
  1040.   * eax = -1 - error (invalid identifier)
  1041. Remarks:
  1042.   * The thread can minimize its window with subfunction 10.
  1043.   * One can restore and activate window simultaneously with
  1044.     subfunction 3 (which requires slot number).
  1045.  
  1046. ======================================================================
  1047. ==================== Function 20 - MIDI interface. ===================
  1048. ======================================================================
  1049.  
  1050. ----------------------- Subfunction 1 - reset ------------------------
  1051. Parameters:
  1052.   * eax = 20 - function number
  1053.   * ebx = 1 - subfunction number
  1054.  
  1055. -------------------- Subfunction 2 - output byte ---------------------
  1056. Parameters:
  1057.   * eax = 20 - function number
  1058.   * ebx = 2 - subfunction number
  1059.   * cl = byte for output
  1060. Returned value (is the same for both subfunctions):
  1061.   * eax = 0 - success
  1062.   * eax = 1 - base port is not defined
  1063. Remarks:
  1064.   * Previously the base port must be defined by
  1065.     subfunction 1 of function 21.
  1066.  
  1067. ======================================================================
  1068. ======== Function 21, subfunction 1 - set MPU MIDI base port. ========
  1069. ======================================================================
  1070. Parameters:
  1071.   * eax = 21 - function number
  1072.   * ebx = 1 - subfunction number
  1073.   * ecx = number of base port
  1074. Returned value
  1075.   * eax = 0 - success
  1076.   * eax = -1 - erratic number of a port
  1077. Remarks:
  1078.   * Number of a port must satisfy to conditions 0x100<=ecx<=0xFFFF.
  1079.   * The installation of base is necessary for function 20.
  1080.   * To get base port use subfunction 1 of function 26.
  1081.  
  1082. ======================================================================
  1083. ========== Function 21, subfunction 2 - set keyboard layout. =========
  1084. ======================================================================
  1085. Keyboard layout is used to convert keyboard scancodes to ASCII-codes,
  1086. which will be read by function 2.
  1087. Parameters:
  1088.   * eax = 21 - function number
  1089.   * ebx = 2 - subfunction number
  1090.   * ecx = which layout to set:
  1091.     * 1 = normal layout
  1092.     * 2 = layout at pressed Shift
  1093.     * 3 = layout at pressed Alt
  1094.   * edx = pointer to layout - table of length 128 bytes
  1095. Or:
  1096.   * ecx = 9
  1097.   * dx = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1098. Returned value:
  1099.   * eax = 0 - success
  1100.   * eax = 1 - incorrect parameter
  1101. Remarks:
  1102.   * If Alt is pressed, the layout with Alt is used;
  1103.     if Alt is not pressed, but Shift is pressed,
  1104.     the layout with Shift is used;
  1105.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1106.     layout is used and then from the code is subtracted 0x60;
  1107.     if no control key is pressed, the normal layout is used.
  1108.   * To get layout and country identifier use
  1109.     subfunction 2 of function 26.
  1110.   * Country identifier is global system variable, which is not used
  1111.     by the kernel itself; however the application '@panel' displays
  1112.     the corresponding icon.
  1113.   * The application @panel switches layouts on user request.
  1114.  
  1115. ======================================================================
  1116. ============== Function 21, subfunction 3 - set CD base. =============
  1117. ======================================================================
  1118. Parameters:
  1119.   * eax = 21 - function number
  1120.   * ebx = 3 - subfunction number
  1121.   * ecx = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1122. Returned value:
  1123.   * eax = 0
  1124. Remarks:
  1125.   * CD base is used by function 24.
  1126.   * To get CD base use subfunction 3 of function 26.
  1127.  
  1128. ======================================================================
  1129. ====== Function 21, subfunction 4 - set Sound Blaster base port. =====
  1130. ======================================================================
  1131. Parameters:
  1132.   * eax = 21 - function number
  1133.   * ebx = 4 - subfunction number
  1134.   * ecx = number of the base port
  1135. Returned value:
  1136.   * eax = 0 - success
  1137.   * eax = -1 - erratic port number
  1138. Remarks:
  1139.   * Number of the port must satisfy to conditions 0x100<=ecx<=0xFFFF.
  1140.   * The installation of the base is necessary for
  1141.     functions 25, 28, 55.
  1142.   * To get base port use subfunction 4 of function 26.
  1143.  
  1144. ======================================================================
  1145. ========== Function 21, subfunction 5 - set system language. =========
  1146. ======================================================================
  1147. Parameters:
  1148.   * eax = 21 - function number
  1149.   * ebx = 5 - subfunction number
  1150.   * ecx = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1151. Returned value:
  1152.   * eax = 0
  1153. Remarks:
  1154.   * System language is global system variable and is not used
  1155.     by the kernel itself, however application @panel draws the
  1156.     appropriate icon.
  1157.   * Function does not check for correctness, as the kernel does not
  1158.     use this variable.
  1159.   * To get system language use subfunction 5 of function 26.
  1160.  
  1161. ======================================================================
  1162. ============== Function 21, subfunction 7 - set HD base. =============
  1163. ======================================================================
  1164. The HD base defines hard disk to write with usage of obsolete
  1165. syntax /HD in obsolete function 58; at usage of modern syntax
  1166. /HD0,/HD1,/HD2,/HD3 base is set automatically.
  1167. Parameters:
  1168.   * eax = 21 - function number
  1169.   * ebx = 7 - subfunction number
  1170.   * ecx = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1171. Returned value:
  1172.   * eax = 0
  1173. Remarks:
  1174.   * Any application at any time can change the base.
  1175.   * Do not change base, when any application works with hard disk.
  1176.     If you do not want system bugs.
  1177.   * To get HD base use subfunction 7 of function 26.
  1178.   * It is also necessary to define used partition of hard disk by
  1179.     subfunction 8.
  1180.  
  1181. ======================================================================
  1182. ========= Function 21, subfunction 8 - set used HD partition. ========
  1183. ======================================================================
  1184. The HD partition defines partition of the hard disk to write with
  1185. usage of obsolete syntax /HD and obsolete function 58;
  1186. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1187. base and partition are set automatically.
  1188. Parameters:
  1189.   * eax = 21 - function number
  1190.   * ebx = 8 - subfunction number
  1191.   * ecx = HD partition (beginning from 1)
  1192. Return value:
  1193.   * eax = 0
  1194. Remarks:
  1195.   * Any application at any time can change partition.
  1196.   * Do not change partition when any application works with hard disk.
  1197.     If you do not want system bugs.
  1198.   * To get used partition use subfunction 8 of function 26.
  1199.   * There is no correctness checks.
  1200.   * To get the number of partitions of a hard disk use
  1201.     subfunction 11 of function 18.
  1202.   * It is also necessary to define used HD base by subfunction 7.
  1203.  
  1204. ======================================================================
  1205. ======== Function 21, subfunction 10 - set sound DMA channel. ========
  1206. ======================================================================
  1207. Parameters:
  1208.   * eax = 21 - function number
  1209.   * ebx = 10 - subfunction number
  1210.   * ecx = number of channel (from 0 up to 3 inclusively)
  1211. Returned value:
  1212.   * eax = 0 - success
  1213.   * eax = -1 - incorrect channel number
  1214. Remarks:
  1215.   * Number of DMA channel is used in subfunction 1 of function 55.
  1216.   * To get sound DMA channel use subfunction 10 of function 26.
  1217.  
  1218. ======================================================================
  1219.  Function 21, subfunction 11 - enable/disable low-level access to HD.
  1220. ======================================================================
  1221. Parameters:
  1222.   * eax = 21 - function number
  1223.   * ebx = 11 - subfunction number
  1224.   * ecx = 0/1 - disable/enable
  1225. Returned value:
  1226.   * eax = 0
  1227. Remarks:
  1228.   * Is used in LBA-read (subfunction 8 of function 58).
  1229.   * The current implementation uses only low bit of ecx.
  1230.   * To get current status use subfunction 11 of function 26.
  1231.  
  1232. ======================================================================
  1233.  Function 21, subfunction 12 - enable/disable low-level access to PCI.
  1234. ======================================================================
  1235. Parameters:
  1236.   * eax = 21 - function number
  1237.   * ebx = 12 - subfunction number
  1238.   * ecx = 0/1 - disable/enable
  1239. Returned value:
  1240.   * eax = 0
  1241. Remarks:
  1242.   * Is used in operations with PCI bus (function 62).
  1243.   * The current implementation uses only low bit of ecx.
  1244.   * To get current status use subfunction 12 of function 26.
  1245.  
  1246. ======================================================================
  1247. ============ Function 21, subfunction 13, subsubfunction 1 ===========
  1248. ======== Initialize + get information on the driver vmode.mdr. =======
  1249. ======================================================================
  1250. Parameters:
  1251.   * eax = 21 - function number
  1252.   * ebx = 13 - subfunction number
  1253.   * ecx = 1 - number of the driver function
  1254.   * edx = pointer to 512-bytes buffer
  1255. Returned value:
  1256.   * if driver is not loaded
  1257.     (never happens in the current implementation):
  1258.     * eax = -1
  1259.     * ebx, ecx destroyed
  1260.   * if driver is loaded:
  1261.     * eax = 'MDAZ' (in fasm style, that is 'M' - low byte, 'Z' - high)
  1262.       - signature
  1263.     * ebx = current frequency of the scanning (in Hz)
  1264.     * ecx destroyed
  1265.     * buffer pointed to by edx is filled
  1266. Format of the buffer:
  1267.   * +0: 32*byte: driver name, "Trans VideoDriver"
  1268.     (without quotes, supplemented by spaces)
  1269.   * +32 = +0x20: dword: driver version (version x.y is encoded as
  1270.     y*65536+x), for the current implementation is 1 (1.0)
  1271.   * +36 = +0x24: 7*dword: reserved (0 in the current implementation)
  1272.   * +64 = +0x40: 32*word: list of supported videomodes (each word
  1273.     is number of a videomode, after list itself there are zeroes)
  1274.   * +128 = +0x80: 32*(5*word): list of supported frequences of the
  1275.     scannings for videomodes: for each videomode listed in the
  1276.     previous field up to 5 supported frequences are given
  1277.     (unused positions contain zeroes)
  1278. Remarks:
  1279.   * Function initializes the driver (if it is not initialized yet)
  1280.     and must be called first, before others (otherwise they will do
  1281.     nothing and return -1).
  1282.   * The current implementation supports only one frequency
  1283.     of the scanning on videomode.
  1284.  
  1285. ======================================================================
  1286. ============ Function 21, subfunction 13, subsubfunction 2 ===========
  1287. ================ Get information on current videomode. ===============
  1288. ======================================================================
  1289. Parameters:
  1290.   * eax = 21 - function number
  1291.   * ebx = 13 - subfunction number
  1292.   * ecx = 2 - number of the driver function
  1293. Returned value:
  1294.   * eax = -1 - driver is not loaded or not initialized;
  1295.     ebx,ecx are destroyed
  1296.   * eax = [width]*65536 + [height]
  1297.   * ebx = frequency of the vertical scanning (in Hz)
  1298.   * ecx = number of current videomode
  1299. Remarks:
  1300.   * Driver must be initialized by call to
  1301.     driver function 1.
  1302.   * If only screen sizes are required, it is more expedient to use
  1303.     function 14 taking into account that it
  1304.     returns sizes on 1 less.
  1305.  
  1306. ======================================================================
  1307. === Function 21, subfunction 13, subsubfunction 3 - set videomode. ===
  1308. ======================================================================
  1309. Parameters:
  1310.   * eax = 21 - function number
  1311.   * ebx = 13 - subfunction number
  1312.   * ecx = 3 - number of the driver function
  1313.   * edx = [scanning frequency]*65536 + [videomode number]
  1314. Returned value:
  1315.   * eax = -1 - driver is not loaded, not initialized or
  1316.     an error has occured
  1317.   * eax = 0 - success
  1318.   * ebx, ecx destroyed
  1319. Remarks:
  1320.   * Driver must be initialized by driver function 1.
  1321.   * The videomode number and frequency must be in the table
  1322.     returned by driver function 1.
  1323.  
  1324. ======================================================================
  1325. ============ Function 21, subfunction 13, subsubfunction 4 ===========
  1326. ================== Return to the initial videomode. ==================
  1327. ======================================================================
  1328. Returns the screen to the videomode set at system boot.
  1329. Parameters:
  1330.   * eax = 21 - function number
  1331.   * ebx = 13 - subfunction number
  1332.   * ecx = 4 - number of the driver function
  1333. Returned value:
  1334.   * eax = -1 - driver is not loaded or not initialized
  1335.   * eax = 0 - success
  1336.   * ebx, ecx destroyed
  1337. Remarks:
  1338.   * Driver must be initialized by call to driver function 1.
  1339.  
  1340. ======================================================================
  1341. ============ Function 21, subfunction 13, subsubfunction 5 ===========
  1342. ===== Increase/decrease the size of the visible area of monitor. =====
  1343. ======================================================================
  1344. Parameters:
  1345.   * eax = 21 - function number
  1346.   * ebx = 13 - subfunction number
  1347.   * ecx = 5 - number of the driver function
  1348.   * edx = 0/1 - decrease/increase horizontal size on 1 position
  1349.   * edx = 2/3 - is not supported in the current implementation;
  1350.     is planned as decrease/increase vertical size on 1 position
  1351. Returned value:
  1352.   * eax = -1 - driver is not loaded or not initialized
  1353.   * eax = 0 - success
  1354.   * ebx, ecx destroyed
  1355. Remarks:
  1356.   * Driver must be initialized by call to driver function 1.
  1357.   * Function influences only the physical size of the screen image;
  1358.     the logical size (number of pixels) does not change.
  1359.  
  1360. ======================================================================
  1361. ================= Function 22 - set system date/time. ================
  1362. ======================================================================
  1363. Parameters:
  1364.   * eax = 22 - function number
  1365.   * ebx = 0 - set time
  1366.     * ecx = 0x00SSMMHH - time in the binary-decimal code (BCD):
  1367.     * HH=hour 00..23
  1368.     * MM=minute 00..59
  1369.     * SS=second 00..59
  1370.   * ebx = 1 - set date
  1371.     * ecx = 0x00DDMMYY - date in the binary-decimal code (BCD):
  1372.     * DD=day 01..31
  1373.     * MM=month 01..12
  1374.     * YY=year 00..99
  1375.   * ebx = 2 - set day of week
  1376.     * ecx = 1 for Sunday, ..., 7 for Saturday
  1377.   * ebx = 3 - set alarm clock
  1378.     * ecx = 0x00SSMMHH
  1379. Returned value:
  1380.   * eax = 0 - success
  1381.   * eax = 1 - incorrect parameter
  1382.   * eax = 2 - CMOS-battery was unloaded
  1383. Remarks:
  1384.   * Value of installation of day of week seems to be doubtful,
  1385.     as it a little where is used
  1386.     (day of week can be calculated by date).
  1387.   * Alarm clock can be set on operation in the given time every day.
  1388.     But there is no existing system function to disable it.
  1389.   * Operation of alarm clock consists in generation IRQ8.
  1390.   * Generally CMOS supports for alarm clock set of value 0xFF
  1391.     as one of parameters and it means that the appropriate parameter
  1392.     is ignored. But current implementation does not allow this
  1393.     (will return 1).
  1394.   * Alarm clock is a global system resource; the set of
  1395.     an alarm clock cancels automatically the previous set.
  1396.     However, at moment no program uses it.
  1397.  
  1398. ======================================================================
  1399. ============= Function 23 - wait for event with timeout. =============
  1400. ======================================================================
  1401. If the message queue is empty, waits for new message in the queue,
  1402. but no more than given time. Then reads out a message from the queue.
  1403.  
  1404. Parameters:
  1405.   * eax = 23 - function number
  1406.   * ebx = timeout (in 1/100 of second)
  1407. Returned value:
  1408.   * eax = 0 - the message queue is empty
  1409.   * otherwise eax = event (see the list of events)
  1410. Remarks:
  1411.   * Only those events are taken into account, which enter into
  1412.     the mask set by function 40. By default it is
  1413.     redraw, key and button events.
  1414.   * To check for presence of a message in the queue use function 11.
  1415.     To wait without timeout use function 10.
  1416.   * Transmission ebx=0 results in immediate returning eax=0.
  1417.   * Current implementation returns immediately with eax=0,
  1418.     if the addition of ebx with the current value of time counter
  1419.     makes 32-bit overflow.
  1420.  
  1421. ======================================================================
  1422. ======== Function 24, subfunction 1 - begin to play CD-audio. ========
  1423. ======================================================================
  1424. Parameters:
  1425.   * eax = 24 - function number
  1426.   * ebx = 1 - subfunction number
  1427.   * ecx = 0x00FRSSMM, where
  1428.     * MM = starting minute
  1429.     * SS = starting second
  1430.     * FR = starting frame
  1431. Returned value:
  1432.   * eax = 0 - success
  1433.   * eax = 1 - CD base is not defined
  1434. Remarks:
  1435.   * Previously CD base must be defined by the call to
  1436.     subfunction 3 of function 21.
  1437.   * One second includes 75 frames, one minute includes 60 seconds.
  1438.   * The function is asynchronous (returns control, when play begins).
  1439.  
  1440. ======================================================================
  1441. ======= Function 24, subfunction 2 - get information on tracks. ======
  1442. ======================================================================
  1443. Parameters:
  1444.   * eax = 24 - function number
  1445.   * ebx = 2 - subfunction number
  1446.   * ecx = pointer to the buffer for the table
  1447.     (maximum 8*64h+4 bytes=100 tracks)
  1448. Returned value:
  1449.   * eax = 0 - success
  1450.   * eax = 1 - CD base is not defined
  1451. Remarks:
  1452.   * The format of the table with tracks information is the same as
  1453.     for ATAPI-CD command 43h (READ TOC), usual table (subcommand 00h).
  1454.     Function returns addresses in MSF.
  1455.   * Previously CD base port must be set by call to
  1456.     subfunction 3 of function 21.
  1457.   * Function returns information only about no more than 100
  1458.     first tracks. In most cases it is enough.
  1459.  
  1460. ======================================================================
  1461. ========== Function 24, subfunction 3 - stop play CD-audio. ==========
  1462. ======================================================================
  1463. Parameters:
  1464.   * eax = 24 - function number
  1465.   * ebx = 1 - subfunction number
  1466. Returned value:
  1467.   * eax = 0 - success
  1468.   * eax = 1 - CD base is not defined
  1469. Remarks:
  1470.   * Previously CD base port must be defined by call to
  1471.     subfunction 3 of function 21.
  1472.  
  1473. ======================================================================
  1474. ======= Function 24, subfunction 4 - eject tray of disk drive. =======
  1475. ======================================================================
  1476. Parameters:
  1477.   * eax = 24 - function number
  1478.   * ebx = 4 - subfunction number
  1479.   * ecx = position of CD/DVD-drive
  1480.       (from 0=Primary Master to 3=Secondary Slave)
  1481. Returned value:
  1482.   * function does not return value
  1483. Remarks:
  1484.   * The function is supported only for ATAPI devices (CD and DVD).
  1485.   * When the tray is being ejected,
  1486.     manual control of tray is unlocked.
  1487.   * When the tray is being ejected, the code clears the cache for
  1488.     corresponding device.
  1489.   * An example of usage of the function is the application CD_tray.
  1490.  
  1491. ======================================================================
  1492. ======== Function 24, subfunction 5 - load tray of disk drive. =======
  1493. ======================================================================
  1494. Parameters:
  1495.   * eax = 24 - function number
  1496.   * ebx = 5 - subfunction number
  1497.   * ecx = position of CD/DVD-drive
  1498.       (from 0=Primary Master to 3=Secondary Slave)
  1499. Returned value:
  1500.   * function does not return value
  1501. Remarks:
  1502.   * The function is supported only for ATAPI devices (CD and DVD).
  1503.   * An example of usage of the function is the application CD_tray.
  1504.  
  1505. ======================================================================
  1506. =================== Function 25 - set SBPro volume. ==================
  1507. ======================================================================
  1508. Parameters:
  1509.   * eax = 25 - function number
  1510.   * ebx = what to set:
  1511.     * 1 - set common volume
  1512.     * 2 - set CD-audio volume
  1513.   * cl = volume level: high 4 bits for the left column,
  1514.     low 4 bits for the right one
  1515. Returned value:
  1516.   * eax = 0 - success
  1517.   * eax = 1 - SB base is not defined
  1518.   * eax = 2 - incorrect subfunction
  1519. Remarks:
  1520.   * Previously SB base port must be defined by
  1521.     subfunction 4 of function 21.
  1522.   * See also function 28 which sets
  1523.     volume for the later standard SB16.
  1524.  
  1525. ======================================================================
  1526. ======== Function 26, subfunction 1 - get MPU MIDI base port. ========
  1527. ======================================================================
  1528. Parameters:
  1529.   * eax = 26 - function number
  1530.   * ebx = 1 - subfunction number
  1531. Returned value:
  1532.   * eax = port number
  1533. Parameters:
  1534.   * To set base port use subfunction 1 of function 21.
  1535.  
  1536. ======================================================================
  1537. ========== Function 26, subfunction 2 - get keyboard layout. =========
  1538. ======================================================================
  1539. The keyboard layout is used to convert keyboard scancodes to
  1540. ASCII-codes for function 2.
  1541. Parameters:
  1542.   * eax = 26 - function number
  1543.   * ebx = 2 - subfunction number
  1544.   * ecx = what layout to get:
  1545.     * 1 = normal layout
  1546.     * 2 = layout with pressed Shift
  1547.     * 3 = layout with pressed Alt
  1548.   * edx = pointer to the 128-bytes buffer, where the layout will be
  1549.     copied
  1550. Returned value:
  1551.   * function does not return value
  1552. Or:
  1553.   * eax = 26 - function number
  1554.   * ebx = 2 - subfunction number
  1555.   * ecx = 9
  1556. Returned value:
  1557.   * eax = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1558. Remarks:
  1559.   * If Alt is pressed, the layout with Alt is used;
  1560.     if Alt is not pressed, but Shift is pressed,
  1561.     the layout with Shift is used;
  1562.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1563.     layout is used and then from the code is subtracted 0x60;
  1564.     if no control key is pressed, the normal layout is used.
  1565.   * To set layout and country identifier use
  1566.     subfunction 2 of function 21.
  1567.   * Country identifier is global system variable, which is not used
  1568.     by the kernel itself; however the application '@panel' displays
  1569.     the corresponding icon (using this function).
  1570.   * The application @panel switches layouts on user request.
  1571.  
  1572. ======================================================================
  1573. ============== Function 26, subfunction 3 - get CD base. =============
  1574. ======================================================================
  1575. Parameters:
  1576.   * eax = 26 - function number
  1577.   * ebx = 3 - subfunction number
  1578. Returned value:
  1579.   * eax = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1580. Remarks:
  1581.   * CD base is used by function 24.
  1582.   * To set CD base use subfunction 3 of function 21.
  1583.  
  1584. ======================================================================
  1585. ====== Function 26, subfunction 4 - get Sound Blaster base port. =====
  1586. ======================================================================
  1587. Parameters:
  1588.   * eax = 26 - function number
  1589.   * ebx = 4 - subfunction number
  1590. Returned value:
  1591.   * eax = base port number
  1592. Remarks:
  1593.   * Bae port is used by functions 25, 55.
  1594.   * To set base port use subfunction 4 of function 21.
  1595.  
  1596. ======================================================================
  1597. ========== Function 26, subfunction 5 - get system language. =========
  1598. ======================================================================
  1599. Parameters:
  1600.   * eax = 26 - function number
  1601.   * ebx = 5 - subfunction number
  1602. Returned value:
  1603.   * eax = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1604. Remarks:
  1605.   * System language is global system variable and is not used
  1606.     by the kernel itself, however application @panel draws the
  1607.     appropriate icon (using this function).
  1608.   * To set system language use subfunction 5 of function 21.
  1609.  
  1610. ======================================================================
  1611. ============== Function 26, subfunction 7 - get HD base. =============
  1612. ======================================================================
  1613. The HD base defines hard disk to write with usage of obsolete
  1614. syntax /HD in obsolete function 58; at usage of modern syntax
  1615. /HD0,/HD1,/HD2,/HD3 base is set automatically.
  1616. Parameters:
  1617.   * eax = 26 - function number
  1618.   * ebx = 7 - subfunction number
  1619. Returned value:
  1620.   * eax = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1621. Remarks:
  1622.   * Any application in any time can change HD base.
  1623.   * To set base use subfunction 7 of function 21.
  1624.   * To get used partition of hard disk use subfunction 8.
  1625.  
  1626. ======================================================================
  1627. ========= Function 26, subfunction 8 - get used HD partition. ========
  1628. ======================================================================
  1629. The HD partition defines partition of the hard disk to write with
  1630. usage of obsolete syntax /HD in obsolete function 58;
  1631. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1632. base and partition are set automatically.
  1633. Parameters:
  1634.   * eax = 26 - function number
  1635.   * ebx = 8 - subfunction number
  1636. Returned value:
  1637.   * eax = HD partition (beginning from 1)
  1638. Remarks:
  1639.   * Any application in any time can change partition.
  1640.   * To set partition use subfunction 8 of function 21.
  1641.   * To get number of partitions on a hard disk use
  1642.     subfunction 11 of function 18.
  1643.   * To get base of used hard disk, use subfunction 7.
  1644.  
  1645. ======================================================================
  1646. === Function 26, subfunction 9 - get the value of the time counter. ==
  1647. ======================================================================
  1648. Parameters:
  1649.   * eax = 26 - function number
  1650.   * ebx = 9 - subfunction number
  1651. Returned value:
  1652.   * eax = number of 1/100s of second, past from the system boot time
  1653. Remarks:
  1654.   * Counter takes modulo 2^32, that correspond to a little more
  1655.     than 497 days.
  1656.   * To get system time use function 3.
  1657.  
  1658. ======================================================================
  1659. ======== Function 26, subfunction 10 - get sound DMA channel. ========
  1660. ======================================================================
  1661. Parameters:
  1662.   * eax = 26 - function number
  1663.   * ebx = 10 - subfunction number
  1664. Returned value:
  1665.   * eax = number of the channel (from 0 to 3 inclusive)
  1666. Remarks:
  1667.   * Number of the DMA channel is used by subfunction 1 of function 55.
  1668.   * To set the sound DMA channel use subfunction 10 of function 21.
  1669.  
  1670. ======================================================================
  1671. ===================== Function 26, subfunction 11 ====================
  1672. ========== Find out whether low-level HD access is enabled. ==========
  1673. ======================================================================
  1674. Parameters:
  1675.   * eax = 26 - function number
  1676.   * ebx = 11 - subfunction number
  1677. Returned value:
  1678.   * eax = 0/1 - disabled/enabled
  1679. Remarks:
  1680.   * Is used in LBA read (subfunction 8 of function 58).
  1681.   * To set current state use subfunction 11 of function 21.
  1682.  
  1683. ======================================================================
  1684. ===================== Function 26, subfunction 12 ====================
  1685. ========== Find out whether low-level PCI access is enabled. =========
  1686. ======================================================================
  1687. Parameters:
  1688.   * eax = 26 - function number
  1689.   * ebx = 12 - subfunction number
  1690. Returned value:
  1691.   * eax = 0/1 - disabled/enabled
  1692. Remarks:
  1693.   * Is used by operations with PCI bus (function 62).
  1694.   * The current implementation uses only low bit of ecx.
  1695.   * To set the current state use subfunction 12 of function 21.
  1696.  
  1697. ======================================================================
  1698. =================== Function 28 - set SB16 volume. ===================
  1699. ======================================================================
  1700. Parameters:
  1701.   * eax = 28 - function number
  1702.   * ebx = what to install:
  1703.     * 1 - install common volume
  1704.     * 2 - install CD-audio volume
  1705.   * cl = volume level (0=off, 0xFF=max)
  1706. Returned value:
  1707.   * eax = 0 - success
  1708.   * eax = 1 - SB base is not defined
  1709.   * eax = 2 - incorrect subfunction
  1710. Remarks:
  1711.   * Previously SB base port must be defined by
  1712.     subfunction 4 of function 21.
  1713.   * This function gives more variants for volume, that function 25.
  1714.  
  1715. ======================================================================
  1716. =================== Function 29 - get system date. ===================
  1717. ======================================================================
  1718. Parameters:
  1719.   * eax = 29 - function number
  1720. Returned value:
  1721.   * eax = 0x00DDMMYY, where
  1722.     (binary-decimal coding, BCD, is used)
  1723.   * YY = two low digits of year (00..99)
  1724.   * MM = month (01..12)
  1725.   * DD = day (01..31)
  1726. Remarks:
  1727.   * To set system date use function 22.
  1728.  
  1729. ======================================================================
  1730. ============= Function 30 - work with the current folder. ============
  1731. ======================================================================
  1732.  
  1733. --------- Subfunction 1 - set current folder for the thread. ---------
  1734. Parameters:
  1735.   * eax = 30 - function number
  1736.   * ebx = 1 - subfunction number
  1737.   * ecx = pointer to ASCIIZ-string with the path to new current folder
  1738. Returned value:
  1739.   * function does not return value
  1740.  
  1741. --------- Subfunction 2 - get current folder for the thread. ---------
  1742. Parameters:
  1743.   * eax = 30 - function number
  1744.   * ebx = 2 - subfunction number
  1745.   * ecx = pointer to buffer
  1746.   * edx = size of buffer
  1747. Returned value:
  1748.   * eax = size of the current folder's name (including terminating 0)
  1749. Remarks:
  1750.   * If the buffer is too small to hold all data, only first (edx-1)
  1751.     bytes are copied and than terminating 0 is inserted.
  1752.  
  1753. ======================================================================
  1754. ======= Function 35 - read the color of a pixel on the screen. =======
  1755. ======================================================================
  1756. Parameters:
  1757.   * eax = 35
  1758.   * ebx = y*xsize+x, where
  1759.   * (x,y) = coordinates of a pixel (beginning from 0)
  1760.   * xsize = horizontal screen size
  1761. Returned value:
  1762.   * eax = color 0x00RRGGBB
  1763. Remarks:
  1764.   * To get screen sizes use function 14. Pay attention,
  1765.     that it subtracts 1 from both sizes.
  1766.   * There is also direct access (without any system calls)
  1767.     to videomemory through the selector gs. To get parameters of
  1768.     the current videomode, use function 61.
  1769.  
  1770. ======================================================================
  1771. =================== Function 37 - work with mouse. ===================
  1772. ======================================================================
  1773.  
  1774. ---------- Subfunction 0 - screen coordinates of the mouse -----------
  1775. Parameters:
  1776.   * eax = 37 - function number
  1777.   * ebx = 0 - subfunction number
  1778. Returned value:
  1779.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1780.     (beginning from 0)
  1781.  
  1782. -- Subfunction 1 - coordinates of the mouse relative to the window ---
  1783. Parameters:
  1784.   * eax = 37 - function number
  1785.   * ebx = 1 - subfunction number
  1786. Returned value:
  1787.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1788.     relative to the application window (beginning from 0)
  1789. Remarks:
  1790.   * The value is calculated by formula (x-xwnd)*65536 + (y-ywnd).
  1791.     If y>=ywnd, the low word is non-negative and contains
  1792.     relative y-coordinate, and the high word - relative x-coordinate
  1793.     (with correct sign). Otherwise the low word is negative and still
  1794.     contains relative y-coordinate, and to the high word
  1795.     1 should be added.
  1796.  
  1797. ------------ Subfunction 2 - pressed buttons of the mouse ------------
  1798. Parameters:
  1799.   * eax = 37 - function number
  1800.   * ebx = 2 - subfunction number
  1801. Returned value:
  1802.   * eax contains information on the pressed mouse buttons:
  1803.   * bit 0 is set = left button is pressed
  1804.   * bit 1 is set = right button is pressed
  1805.   * bit 2 is set = middle button is pressed
  1806.   * bit 3 is set = 4th button is pressed
  1807.   * bit 4 is set = 5th button is pressed
  1808.   * other bits are cleared
  1809.  
  1810. -------------------- Subfunction 4 - load cursor ---------------------
  1811. Parameters:
  1812.   * eax = 37 - function number
  1813.   * ebx = 4 - subfunction number
  1814.   * dx = data source:
  1815.   * dx = LOAD_FROM_FILE = 0 - data in a file
  1816.     * ecx = pointer to full path to the cursor file
  1817.     * the file must be in the format .cur, which is standard for
  1818.       MS Windows, at that of the size 32*32 pixels
  1819.   * dx = LOAD_FROM_MEM = 1 - data of file are already loaded in memory
  1820.     * ecx = pointer to data of the cursor file
  1821.     * the data format is the same as in the previous case
  1822.   * dx = LOAD_INDIRECT = 2 - data in memory
  1823.     * ecx = pointer to cursor image in the format ARGB 32*32 pixels
  1824.     * edx = 0xXXYY0002, where
  1825.       * XX = x-coordinate of cursor hotspot
  1826.       * YY = y-coordinate
  1827.       * 0 <= XX, YY <= 31
  1828. Returned value:
  1829.   * eax = 0 - failed
  1830.   * otherwise eax = cursor handle
  1831.  
  1832. --------------------- Subfunction 5 - set cursor ---------------------
  1833. Sets new cursor for the window of the current thread.
  1834. Parameters:
  1835.   * eax = 37 - function number
  1836.   * ebx = 5 - subfunction number
  1837.   * ecx = cursor handle
  1838. Returned value:
  1839.   * eax = handle of previous cursor
  1840. Remarks:
  1841.   * If the handle is incorrect, the function restores the default
  1842.     cursor (standard arrow). In particular, ecx=0 restores it.
  1843.  
  1844. ------------------- Subfunction 6 - delete cursor --------------------
  1845. Parameters:
  1846.   * eax = 37 - function number
  1847.   * ebx = 6 - subfunction number
  1848.   * ecx = cursor handle
  1849. Returned value:
  1850.   * eax destroyed
  1851. Remarks:
  1852.   * The cursor must be loaded previously by the current thread
  1853.     (with the call to subfunction 4). The function does not delete
  1854.     system cursors and cursors, loaded by another applications.
  1855.   * If the active cursor (set by subfunction 5) is deleted,
  1856.     the system restores the default cursor (standard arrow).
  1857.  
  1858. ------------------ Subfunction 7 - get scroll data -------------------
  1859. Parameters:
  1860.   * eax = 37 - function number
  1861.   * ebx = 7 - subfunction number
  1862. Returned value:
  1863.   * eax = [horizontal offset]*65536 + [vertical offset]
  1864. Remarks:
  1865.   * Scroll data is available for active window only.
  1866.   * Values are zeroed after reading.
  1867.   * Values are signed.
  1868.  
  1869. ======================================================================
  1870. ====================== Function 38 - draw line. ======================
  1871. ======================================================================
  1872. Parameters:
  1873.   * eax = 38 - function number
  1874.   * ebx = [start coordinate on axis x]*65536 +
  1875.               [end coordinate on axis x]
  1876.   * ecx = [start coordinate on axis y]*65536 +
  1877.               [end coordinate on axis y]
  1878.   * edx = 0x00RRGGBB - color
  1879.     edx = 0x01xxxxxx - draw inversed line
  1880.           (low 24 bits are ignored)
  1881. Returned value:
  1882.   * function does not return value
  1883. Remarks:
  1884.   * Coordinates are relative to the window.
  1885.   * End point is also drawn.
  1886.  
  1887. ======================================================================
  1888. == Function 39, subfunction 1 - get a size of the background image. ==
  1889. ======================================================================
  1890. Parameters:
  1891.   * eax = 39 - function number
  1892.   * ebx = 1 - subfunction number
  1893. Returned value:
  1894.   * eax = [width]*65536 + [height]
  1895. Remarks:
  1896.   * There is a pair function to set sizes of background image -
  1897.     subfunction 1 of function 15. After which it is necessary,
  1898.     of course, anew to define image.
  1899.  
  1900. ======================================================================
  1901. == Function 39, subfunction 2 - get pixel from the background image. =
  1902. ======================================================================
  1903. Parameters:
  1904.   * eax = 39 - function number
  1905.   * ebx = 2 - subfunction number
  1906.   * ecx = offset
  1907. Returned value:
  1908.   * eax = 0x00RRGGBB - pixel color, if offset is valid
  1909.     (less than 0x160000-16)
  1910.   * eax = 2 otherwise
  1911. Remarks:
  1912.   * Do not rely on returned value for invalid offsets, it may be
  1913.     changed in future kernel versions.
  1914.   * Offset for pixel with coordinates (x,y)
  1915.     is calculated as (x+y*xsize)*3.
  1916.   * There is a pair function to set pixel on the background image -
  1917.     subfunction 2 of function 15.
  1918.  
  1919. ======================================================================
  1920. == Function 39, subfunction 4 - get drawing mode for the background. =
  1921. ======================================================================
  1922. Parameters:
  1923.   * eax = 39 - function number
  1924.   * ebx = 4 - subfunction number
  1925. Returned value:
  1926.   * eax = 1 - tile
  1927.   * eax = 2 - stretch
  1928. Remarks:
  1929.   * There is a pair function to set drawing mode -
  1930.     subfunction 4 of function 15.
  1931.  
  1932. ======================================================================
  1933. =========== Function 40 - set the mask for expected events. ==========
  1934. ======================================================================
  1935. The mask for expected events affects function working with events
  1936. 10, 11, 23 - they notify only about events allowed by this mask.
  1937. Parameters:
  1938.   * eax = 40 - function number
  1939.   * ebx = mask: bit i corresponds to event i+1 (see list of events)
  1940.     (set bit permits notice on event)
  1941. Returned value:
  1942.   * function does not return value
  1943. Remarks:
  1944.   * Default mask (7=111b) enables nofices about redraw,
  1945.     keys and buttons. This is enough for many applications.
  1946.   * Events prohibited in the mask are saved anyway, when come;
  1947.     they are simply not informed with event functions.
  1948.   * Event functions take into account the mask on moment of
  1949.     function call, not on moment of event arrival.
  1950.  
  1951. ======================================================================
  1952. ==================== Function 41 - get IRQ owner. ====================
  1953. ======================================================================
  1954. Parameters:
  1955.   * eax = 41 - function number
  1956.   * ebx = IRQ number, 0..15
  1957. Returned value:
  1958.   * eax = owner PID
  1959.   * eax = 0, if there is no owner
  1960.   * eax = -1 for incorrect ebx
  1961.  
  1962. ======================================================================
  1963. ==================== Function 42 - work with IRQ data. ===============
  1964. ======================================================================
  1965.  
  1966. ------------------------ Reading data --------------------------------
  1967.  
  1968. When an IRQ occurs, the system reads data from ports indicated
  1969. earlier by function 44 and writes this data to
  1970. internal buffer. This function reads out data from that buffer
  1971. to the buffer specified as parameter.
  1972. Parameters:
  1973.   * eax = 42 - function number
  1974.   * bl = IRQ number, 0..15
  1975.   * bh = subfunction number, 0
  1976. Other part of register ebx, must be zero.
  1977.   * ecx = pointer to the receive buffer
  1978. Returned value: (use value of eax to distinguish)
  1979.   * if the thread is not IRQ owner (or IRQ number is incorrect):
  1980.     * eax = -1
  1981.   * if there is no data:
  1982.     * eax = 0
  1983.   * if all is ok:
  1984.     * eax = byte size of data, read from buffer
  1985.  
  1986. See remarks below.
  1987.  
  1988. ------------------------ Get data size -------------------------------
  1989.  
  1990. Parameters:
  1991.   * eax = 42 - function number
  1992.   * bl = IRQ number, 0..15
  1993.   * bh = subfunction number, 0
  1994. Other part of register ebx, must be zero.
  1995.   * ecx = pointer to receive buffer
  1996. Returned value: (use value of eax to distinguish)
  1997.   * if the thread is not IRQ owner (or IRQ number is incorrect):
  1998.     * eax = -1
  1999.   * if all is ok:
  2000.     * eax = byte size of data in buffer
  2001.  
  2002. Remarks:
  2003.   * Previously the thread must reserve indicated IRQ for itself
  2004.     by function 45.
  2005.   * The size of data buffer is 4000 bytes, on overflow
  2006.     "fresh" data cease to be written in the buffer.
  2007.  
  2008. ======================================================================
  2009. ================ Function 43 - input/output to a port. ===============
  2010. ======================================================================
  2011.  
  2012. ------------------------ Output data to port -------------------------
  2013. Parameters:
  2014.   * eax = 43 - function number
  2015.   * bl = byte for output
  2016.   * ecx = port number 0xnnnn (from 0 to 0xFFFF)
  2017. Returned value:
  2018.   * eax = 0 - success
  2019.   * eax = 1 - the thread has not reserved the selected port
  2020.  
  2021. ------------------------ Input data from port ------------------------
  2022. Parameters:
  2023.   * eax = 43 - function number
  2024.   * ebx is ignored
  2025.   * ecx = 0x8000nnnn, where nnnn = port number (from 0 to 0xFFFF)
  2026. Returned value:
  2027.   * eax = 0 - success, thus ebx = entered byte
  2028.   * eax = 1 - the thread has not reserved the selected port
  2029. Remarks:
  2030.   * Previously the thread must reserve the selected port
  2031.     for itself by function 46.
  2032.   * Instead of call to this function it is better to use
  2033.     processor instructions in/out - this is much
  2034.     faster and a bit shorter and easier.
  2035.  
  2036. ======================================================================
  2037. =========== Function 44 - define operations at IRQ arrival. ==========
  2038. ======================================================================
  2039. At IRQ arrival the system can read the data from ports defined
  2040. by this function and write these data to internal buffer, whence
  2041. they can be read by ôóíêöèåé 42.
  2042. Parameters:
  2043.   * eax = 44 - function number
  2044.   * ebx = pointer to the array of structures each describing one port:
  2045.     * +0: word: 0 means end of array, otherwise port number
  2046.     * +2: byte: reserved (ignored)
  2047.     * +3: byte: 1=read byte from this port, 2=read word
  2048.   * ecx = IRQ number, 0..15
  2049. Returned value:
  2050.   * eax = 0 - success
  2051.   * eax = 1 - the thread is not owner of selected IRQ
  2052. Remarks:
  2053.   * Previously the thread must reserve for itself selected IRQ
  2054.     by function 45.
  2055.   * First 16 ports are considered only.
  2056.   * The current implementation considers incorrect value of field +3
  2057.     as a signal to terminate IRQ processing.
  2058.  
  2059. ======================================================================
  2060. =================== Function 45 - reserve/free IRQ. ==================
  2061. ======================================================================
  2062. Parameters:
  2063.   * eax = 45 - function number
  2064.   * ebx = 0 - reserve, 1 = free
  2065.   * ecx = IRQ number, 0..15
  2066. Returned value:
  2067.   * eax = 0 - success
  2068.   * eax = 1 - error (invalid IRQ number
  2069.     or attempt to reserve not free IRQ
  2070.     or to free IRQ, not reserved by this thread)
  2071. Remarks:
  2072.   * IRQ reservation is required for functions 42 and 44.
  2073.   * Only one thread can reserve the specific IRQ.
  2074.   * IRQs, handled by the system itself, are reserved by the system
  2075.     (thread 1) at booting.
  2076.   * When a thread terminates, all reserved by it IRQs
  2077.     are freed automatically.
  2078.  
  2079. ======================================================================
  2080. ====== Function 46 - reserve/free a group of input/output ports. =====
  2081. ======================================================================
  2082. To work with reserved ports an application can access directly by
  2083. commands in/out (recommended way) and can use function 43
  2084. (not recommended way).
  2085. Parameters:
  2086.   * eax = 46 - function number
  2087.   * ebx = 0 - reserve, 1 - free
  2088.   * ecx = start port number
  2089.   * edx = end port number (inclusive)
  2090. Returned value:
  2091.   * eax = 0 - success
  2092.   * eax = 1 - error
  2093. Remarks:
  2094.   * For ports reservation: an error occurs if and only if
  2095.     one from the following condition satisfies:
  2096.     * start port is more than end port;
  2097.     * the selected range contains incorrect port number
  2098.       (correct are from 0 to 0xFFFF);
  2099.     * limit for the total number of reserved areas is exceeded
  2100.       (maximum 255 are allowed);
  2101.     * the selected range intersects with any of earlier reserved
  2102.   * For ports free: an error is an attempt to free range,
  2103.     that was not earlier reserved by this function
  2104.     (with same ecx,edx).
  2105.   * If an error occurs (for both cases) function performs no action.
  2106.   * At booting the system reserves for itself ports
  2107.     0..0x2d, 0x30..0x4d, 0x50..0xdf, 0xe5..0xff (inclusively).
  2108.   * When a thread terminates, all reserved by it ports
  2109.     are freed automatically.
  2110.  
  2111. ======================================================================
  2112. ============= Function 47 - draw a number in the window. =============
  2113. ======================================================================
  2114. Parameters:
  2115.   * eax = 47 - function number
  2116.   * ebx = parameters of conversion number to text:
  2117.     * bl = 0 - ecx contains number
  2118.     * bl = 1 - ecx contains pointer to dword/qword-number
  2119.     * bh = 0 - display in decimal number system
  2120.     * bh = 1 - display in hexadecimal system
  2121.     * bh = 2 - display in binary system
  2122.     * bits 16-21 = how many digits to display
  2123.     * bits 22-29 reserved and must be set to 0
  2124.     * bit 30 set = display qword (64-bit) number (must be bl=1)
  2125.     * bit 31 set = do not display leading zeroes of the number
  2126.   * ecx = number (if bl=0) or pointer (if bl=1)
  2127.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  2128.   * esi = 0xX0RRGGBB:
  2129.     * RR, GG, BB specify the color
  2130.     * X = ABnn (bits)
  2131.     * nn = font (0/1)
  2132.     * A is ignored
  2133.     * B=1 - fill background with the color edi
  2134. Returned value:
  2135.   * function does not return value
  2136. Remarks:
  2137.   * The given length must not exceed 60.
  2138.   * The exactly given amount of digits is output. If number is small
  2139.     and can be written by smaller amount of digits, it is supplemented
  2140.     by leading zeroes; if the number is big and can not be written by
  2141.     given amount of digits, extra digits are not drawn.
  2142.   * Parameters of fonts are shown in the description of function 4
  2143.     (text output).
  2144.  
  2145. ======================================================================
  2146. ========= Function 48, subfunction 0 - apply screen settings. ========
  2147. ======================================================================
  2148. Parameters:
  2149.   * eax = 48 - function number
  2150.   * ebx = 0 - subfunction number
  2151.   * ecx = 0 - reserved
  2152. Returned value:
  2153.   * function does not return value
  2154. Remarks:
  2155.   * Function redraws the screen after parameters change by
  2156.     subfunctions 1 and 2.
  2157.   * Function call without prior call to one of indicated subfunctions
  2158.     is ignored.
  2159.   * Function call with nonzero ecx is ignored.
  2160.  
  2161. ======================================================================
  2162. =========== Function 48, subfunction 1 - set button style. ===========
  2163. ======================================================================
  2164. Parameters:
  2165.   * eax = 48 - function number
  2166.   * ebx = 1 - subfunction number
  2167.   * ecx = button style:
  2168.     * 0 = flat
  2169.     * 1 = 3d
  2170. Returned value:
  2171.   * function does not return value
  2172. Remarks:
  2173.   * After call to this function one should redraw the screen by
  2174.     subfunction 0.
  2175.   * Button style influences only to their draw of function 8.
  2176.  
  2177. ======================================================================
  2178. ====== Function 48, subfunction 2 - set standard window colors. ======
  2179. ======================================================================
  2180. Parameters:
  2181.   * eax = 48 - function number
  2182.   * ebx = 2 - subfunction number
  2183.   * ecx = pointer to the color table
  2184.   * edx = size of the color table
  2185.     (must be 40 bytes for future compatibility)
  2186. Format of the color table is shown in description of subfunction 3.
  2187. Returned value:
  2188.   * function does not return value
  2189. Remarks:
  2190.   * After call to this function one should redraw the screen by
  2191.     subfunction 0.
  2192.   * Table of standard colors influences only to applications,
  2193.     which receive this table obviously (by subfunction 3)
  2194.     and use it (specifying colors from it to drawing functions).
  2195.   * Table of standard colors is included in skin and is installed
  2196.     anew with skin installation (by subfunction 8).
  2197.   * Color table can be viewed/changed interactively with
  2198.     the application 'desktop'.
  2199.  
  2200. ======================================================================
  2201. ====== Function 48, subfunction 3 - get standard window colors. ======
  2202. ======================================================================
  2203. Parameters:
  2204.   * eax = 48 - function number
  2205.   * ebx = 3 - subfunction number
  2206.   * ecx = pointer to the buffer with size edx bytes,
  2207.     where table will be written
  2208.   * edx = size of color table
  2209.     (must be 40 bytes for future compatibility)
  2210. Returned value:
  2211.   * function does not return value
  2212. Format of the color table:
  2213. each item is dword-value for color 0x00RRGGBB
  2214.   * +0: dword: frames - color of frame
  2215.   * +4: dword: grab - color of header
  2216.   * +8: dword: grab_button - color of button on header bar
  2217.   * +12 = +0xC: dword: grab_button_text - color of text on button
  2218.     on header bar
  2219.   * +16 = +0x10: dword: grab_text - color of text on header
  2220.   * +20 = +0x14: dword: work - color of working area
  2221.   * +24 = +0x18: dword: work_button - color of button in working area
  2222.   * +28 = +0x1C: dword: work_button_text - color of text on button
  2223.     in working area
  2224.   * +32 = +0x20: dword: work_text - color of text in working area
  2225.   * +36 = +0x24: dword: work_graph - color of graphics in working area
  2226. Remarks:
  2227.   * Structure of the color table is described in the standard
  2228.     include file 'macros.inc' as 'system_colors'; for example,
  2229.     it is possible to write:
  2230.         sc      system_colors           ; variable declaration
  2231.         ...                             ; somewhere one must call
  2232.                                         ; this function with ecx=sc
  2233.         mov     ecx, [sc.work_button_text]      ; read text color on
  2234.                                         ; buttin in working area
  2235.   * A program itself desides to use or not to use color table.
  2236.     For usage program must simply at calls to drawing functions select
  2237.     color taken from the table.
  2238.   * At change of the table of standard colors (by subfunction 2 with
  2239.     the subsequent application of changes by subfunction 0 or
  2240.     at skin set by subfunction 8) the system sends to all windows
  2241.     redraw message (the event with code 1).
  2242.   * Color table can be viewed/changed interactively with
  2243.     the application 'desktop'.
  2244.  
  2245. ======================================================================
  2246. ============ Function 48, subfunction 4 - get skin height. ===========
  2247. ======================================================================
  2248. Parameters:
  2249.   * eax = 48 - function number
  2250.   * ebx = 4 - subfunction number
  2251. Returned value:
  2252.   * eax = skin height
  2253. Remarks:
  2254.   * Skin height is defined as the height of a header
  2255.     of skinned windows.
  2256.   * See also general structure of window in the description
  2257.     of function 0.
  2258.  
  2259. ======================================================================
  2260. ======== Function 48, subfunction 5 - get screen working area. =======
  2261. ======================================================================
  2262. Parameters:
  2263.   * eax = 48 - function number
  2264.   * ebx = 5 - subfunction number
  2265. Returned value:
  2266.   * eax = [left]*65536 + [right]
  2267.   * ebx = [top]*65536 + [bottom]
  2268. Remarks:
  2269.   * The screen working area defines position and coordinates of
  2270.     a maximized window.
  2271.   * The screen working area in view of normal work is all screen
  2272.     without system panel (the application '@panel').
  2273.   * (left,top) are coordinates of the left upper corner,
  2274.     (right,bottom) are coordinates of the right lower one.
  2275.     Thus the size of working area on x axis can be calculated by
  2276.     formula right-left+1, on y axis - by formula bottom-right+1.
  2277.   * See also function 14,
  2278.     to get sizes of all screen.
  2279.   * There is a pair function to set working area - subfunction 6.
  2280.  
  2281. ======================================================================
  2282. ======== Function 48, subfunction 6 - set screen working area. =======
  2283. ======================================================================
  2284. Parameters:
  2285.   * eax = 48 - function number
  2286.   * ebx = 6 - subfunction number
  2287.   * ecx = [left]*65536 + [right]
  2288.   * edx = [top]*65536 + [bottom]
  2289. Returned value:
  2290.   * function does not return value
  2291. Remarks:
  2292.   * The screen working area defines position and coordinates of
  2293.     a maximized window.
  2294.   * This function is used only by the application '@panel',
  2295.     which set working area to all screen without system panel.
  2296.   * (left,top) are coordinates of the left upper corner,
  2297.     (right,bottom) are coordinates of the right lower one.
  2298.     Thus the size of working area on x axis can be calculated by
  2299.     formula right-left+1, on y axis - by formula bottom-right+1.
  2300.   * If 'left'>='right', x-coordinate of working area is not changed.
  2301.     If 'left'<0, 'left' will not be set. If 'right' is greater than or
  2302.     equal to screen width, 'right' will not be set.
  2303.     Similarly on y axis.
  2304.   * See also function 14,
  2305.     to get sizes of all screen.
  2306.   * There is a pair function to get working area - subfunction 5.
  2307.   * This function redraws the screen automatically,
  2308.     updating coordinates and sizes of maximized windows.
  2309.     The system sends to all windows redraw message (the event 1).
  2310.  
  2311. ======================================================================
  2312. =========== Function 48, subfunction 7 - get skin margins. ===========
  2313. ======================================================================
  2314. Returns the area of a header of a skinned window, intended for
  2315. a text of a header.
  2316. Parameters:
  2317.   * eax = 48 - function number
  2318.   * ebx = 7 - subfunction number
  2319. Returned value:
  2320.   * eax = [left]*65536 + [right]
  2321.   * ebx = [top]*65536 + [bottom]
  2322. Remarks:
  2323.   * An application decides itself to use or not to use this function.
  2324.   * It is recommended to take into account returned value
  2325.     of this function for choice of a place for drawing header text
  2326.     (by function 4) or a substitute of header text
  2327.     (at the discretion of an application).
  2328.  
  2329. ======================================================================
  2330. ============= Function 48, subfunction 8 - set used skin. ============
  2331. ======================================================================
  2332. Parameters:
  2333.   * eax = 48 - function number
  2334.   * ebx = 8 - subfunction number
  2335.   * ecx = pointer to a block for function 58, in
  2336.     which the fields of intermediate buffer and file name are filled
  2337. Returned value:
  2338.   * eax = 0 - success
  2339.   * otherwise eax = file system error code; if file does not
  2340.     contain valid skin, function returns error 3
  2341.     (unknown file system).
  2342. Remarks:
  2343.   * After successful skin loading the system sends to all windows
  2344.     redraw message (the event 1).
  2345.   * At booting the system reads skin from file 'default.skn'
  2346.     on ramdisk.
  2347.   * User can change the skin statically by creating hisself
  2348.     'default.skn' or dynamically with the application 'desktop'.
  2349.  
  2350. ======================================================================
  2351. =========== Function 49 - Advanced Power Management (APM). ===========
  2352. ======================================================================
  2353. Parameters:
  2354.   * eax = 49 - function number
  2355.   * dx = number of the APM function
  2356.     (analogue of ax in APM specification)
  2357.   * bx, cx = parameters of the APM function
  2358. Returned value:
  2359.   * 16-bit registers ax, bx, cx, dx, si, di and carry flag CF
  2360.     are set according to the APM specification
  2361.   * high halves of 32-bit registers eax, ebx, ecx,
  2362.     edx, esi, edi are destroyed
  2363. Remarks:
  2364.   * APM 1.2 specification is described in the document
  2365.     "Advanced Power Management (APM) BIOS Specification"
  2366.     (Revision 1.2), available at
  2367.     http://www.microsoft.com/whdc/archive/amp_12.mspx;
  2368.     besides it is included in famous Interrupt List by Ralf Brown
  2369.     (http://www.pobox.com/~ralf/files.html,
  2370.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/).
  2371.  
  2372. ======================================================================
  2373. =================== Function 50 - set window shape. ==================
  2374. ======================================================================
  2375. Normal windows have rectangular shape. This function can give to
  2376. a window any shape. The shape is given by a set of points inside
  2377. the base rectangle belonging to a window. Position and coordinates
  2378. of the base rectangle are set by function 0
  2379. and changed by function 67.
  2380.  
  2381. --------------------------- Set shape data ---------------------------
  2382. Parameters:
  2383.   * eax = 50 - function number
  2384.   * ebx = 0 - subfunction number
  2385.   * ecx = pointer to shape data (array of bytes 0/1)
  2386. Returned value:
  2387.   * function does not return value
  2388.  
  2389. -------------------------- Set shape scale ---------------------------
  2390. Parameters:
  2391.   * eax = 50 - function number
  2392.   * ebx = 1 - subfunction number
  2393.   * ecx sets a scale: each byte of data defines
  2394.     (2^scale)*(2^scale) pixels
  2395. Returned value:
  2396.   * function does not return value
  2397. Remarks:
  2398.   * Default scale is 0 (scale factor is 1). If in the shape data
  2399.     one byte corresponds to one pixel, there is no necessity
  2400.     to set scale.
  2401.   * Let's designate xsize = window width (in pixels), ysize = height;
  2402.     pay attention, that they are one pixel more than defined by
  2403.     functions 0, 67.
  2404.   * On definition of scale xsize and ysize must be divisible
  2405.     on 2^scale.
  2406.   * Byte of data on offset 'a' must be 0/1 and defines belonging
  2407.     to a window of square with the side 2^scale (if scale=0,
  2408.     this is one pixel) and coordinates of the left upper corner
  2409.     (a mod (xsize shr scale), a div (xsize shr scale))
  2410.   * Data size: (xsize shr scale)*(ysize shr scale).
  2411.   * Data must be presented in the memory and not change
  2412.     after set of shape.
  2413.   * The system views the shape data at every window redraw by
  2414.     function 0.
  2415.   * The call of subfunction 0 with NULL pointer results in return
  2416.     to the rectangular shape.
  2417.  
  2418. ======================================================================
  2419. ==================== Function 51 - create thread. ====================
  2420. ======================================================================
  2421. Parameters:
  2422.   * eax = 51 - function number
  2423.   * ebx = 1 - unique subfunction
  2424.   * ecx = address of thread entry point (starting eip)
  2425.   * edx = pointer to thread stack (starting esp)
  2426. Returned value:
  2427.   * eax = -1 - error (there is too many threads)
  2428.   * otherwise eax = TID - thread identifier
  2429.     </UL>    
  2430.  
  2431. ======================================================================
  2432. === Function 52, subfunction 0 - get network driver configuration. ===
  2433. ======================================================================
  2434. Parameters:
  2435.   * eax = 52 - function number
  2436.   * ebx = 0 - subfunction number
  2437. Returned value:
  2438.   * eax = configuration dword
  2439. Remarks:
  2440.   * Configuration dword can be set by subfunction 2.
  2441.   * The kernel does not use this variable. The value of this
  2442.     variable and working with it subfunctions 0 and 2 is represented
  2443.     doubtful.
  2444.  
  2445. ======================================================================
  2446. ========= Function 52, subfunction 1 - get local IP-address. =========
  2447. ======================================================================
  2448. Parameters:
  2449.   * eax = 52 - function number
  2450.   * ebx = 1 - subfunction number
  2451. Returned value:
  2452.   * eax = IP-address (4 bytes)
  2453. Remarks:
  2454.   * Local IP-address is set by subfunction 3.
  2455.  
  2456. ======================================================================
  2457. === Function 52, subfunction 2 - set network driver configuration. ===
  2458. ======================================================================
  2459. Parameters:
  2460.   * eax = 52 - function number
  2461.   * ebx = 2 - subfunction number
  2462.   * ecx = configuration dword; if low 7 bits derivate the number 3,
  2463.     function [re-]initializes Ethernet-card, otherwise
  2464.     Ethernet turns off
  2465. Returned value:
  2466.   * if Ethernet-interface is not requested, function returns eax=2,
  2467.     but this can be changed in future kernel versions
  2468.   * if Ethernet-interface is requested, eax=0 means error
  2469.     (absence of Ethernet-card), and nonzero value - success
  2470. Remarks:
  2471.   * Configuration dword can be read by subfunction 0.
  2472.   * The kernel does not use this variable. The value of this
  2473.     variable, subfunction 0 and part of subfunction 2, which set it,
  2474.     is represented doubtful.
  2475.  
  2476. ======================================================================
  2477. ========= Function 52, subfunction 3 - set local IP-address. =========
  2478. ======================================================================
  2479. Parameters:
  2480.   * eax = 52 - function number
  2481.   * ebx = 3 - subfunction number
  2482.   * ecx = IP-address (4 bytes)
  2483. Returned value:
  2484.   * the current implementation returns eax=3, but this can be changed
  2485.     in future versions
  2486. Remarks:
  2487.   * Local IP-address can be get by subfunction 1.
  2488.  
  2489. ======================================================================
  2490. = Function 52, subfunction 6 - add data to the stack of input queue. =
  2491. ======================================================================
  2492. Parameters:
  2493.   * eax = 52 - function number
  2494.   * ebx = 6 - subfunction number
  2495.   * edx = data size
  2496.   * esi = data pointer
  2497. Returned value:
  2498.   * eax = -1 - error
  2499.   * eax = 0 - success
  2500. Remarks:
  2501.   * This function is intended only for slow network drivers
  2502.     (PPP, SLIP).
  2503.   * Data size must not exceed 1500 bytes, though function
  2504.     performs no checks on correctness.
  2505.  
  2506. ======================================================================
  2507.  Function 52, subfunction 8 - read data from the network output queue.
  2508. ======================================================================
  2509. Parameters:
  2510.   * eax = 52 - function number
  2511.   * ebx = 8 - subfunction number
  2512.   * esi = pointer to 1500-byte buffer
  2513. Returned value:
  2514.   * eax = number of read bytes (in the current implementation
  2515.     either 0 = no data or 1500)
  2516.   * data was copied in buffer
  2517. Remarks:
  2518.   * This function is intended only for slow network drivers
  2519.     (PPP, SLIP).
  2520.  
  2521. ======================================================================
  2522. ============ Function 52, subfunction 9 - get gateway IP. ============
  2523. ======================================================================
  2524. Parameters:
  2525.   * eax = 52 - function number
  2526.   * ebx = 9 - subfunction number
  2527. Returned value:
  2528.   * eax = gateway IP (4 bytes)
  2529.  
  2530. ======================================================================
  2531. =========== Function 52, subfunction 10 - get subnet mask. ===========
  2532. ======================================================================
  2533. Parameters:
  2534.   * eax = 52 - function number
  2535.   * ebx = 10 - subfunction number
  2536. Returned value:
  2537.   * eax = subnet mask
  2538.  
  2539. ======================================================================
  2540. ============ Function 52, subfunction 11 - set gateway IP. ===========
  2541. ======================================================================
  2542. Parameters:
  2543.   * eax = 52 - function number
  2544.   * ebx = 11 - subfunction number
  2545.   * ecx = gateway IP (4 bytes)
  2546. Returned value:
  2547.   * the current implementation returns eax=11, but this can be changed
  2548.     in future versions
  2549.  
  2550. ======================================================================
  2551. =========== Function 52, subfunction 12 - set subnet mask. ===========
  2552. ======================================================================
  2553. Parameters:
  2554.   * eax = 52 - function number
  2555.   * ebx = 12 - subfunction number
  2556.   * ecx = subnet mask
  2557. Returned value:
  2558.   * the current implementation returns eax=12, but this can be changed
  2559.     in future versions
  2560.  
  2561. ======================================================================
  2562. ============== Function 52, subfunction 13 - get DNS IP. =============
  2563. ======================================================================
  2564. Parameters:
  2565.   * eax = 52 - function number
  2566.   * ebx = 13 - subfunction number
  2567. Returned value:
  2568.   * eax = DNS IP (4 bytes)
  2569.  
  2570. ======================================================================
  2571. ============== Function 52, subfunction 14 - set DNS IP. =============
  2572. ======================================================================
  2573. Parameters:
  2574.   * eax = 52 - function number
  2575.   * ebx = 14 - subfunction number
  2576.   * ecx = DNS IP (4 bytes)
  2577. Returned value:
  2578.   * the current implementation returns eax=14, but this can be changed
  2579.     in future versions
  2580.  
  2581. ======================================================================
  2582. ======== Function 52, subfunction 15 - get local MAC address. ========
  2583. ======================================================================
  2584. Parameters:
  2585.   * eax = 52 - function number
  2586.   * ebx = 15 - subfunction number
  2587.   * ecx = 0 - read first 4 bytes,
  2588.     ecx = 4 - read last 2 bytes
  2589. Returned value:
  2590.   * for ecx=0: eax = first 4 bytes of MAC address
  2591.   * for ecx=4: ax = last 2 bytes of MAC address,
  2592.                high half of eax is destroyed
  2593.   * for other ecx: eax = -1 indicates an error
  2594.  
  2595. ======================================================================
  2596. ============ Function 53, subfunction 0 - open UDP-socket. ===========
  2597. ======================================================================
  2598. Parameters:
  2599.   * eax = 53 - function number
  2600.   * ebx = 0 - subfunction number
  2601.   * ecx = local port (only low word is taken into account)
  2602.   * edx = remote port (only low word is taken into account)
  2603.   * esi = remote IP
  2604. Returned value:
  2605.   * eax = -1 = 0xFFFFFFFF - error; ebx destroyed
  2606.   * eax = socket handle (some number which unambiguously identifies
  2607.     socket and have sense only for the system) - success;
  2608.     ebx destroyed
  2609.  
  2610. ======================================================================
  2611. =========== Function 53, subfunction 1 - close UDP-socket. ===========
  2612. ======================================================================
  2613. Parameters:
  2614.   * eax = 53 - function number
  2615.   * ebx = 1 - subfunction number
  2616.   * ecx = socket handle
  2617. Returned value:
  2618.   * eax = -1 - incorrect handle
  2619.   * eax = 0 - success
  2620.   * ebx destroyed
  2621. Remarks:
  2622.   * The current implementation does not close automatically all
  2623.     sockets of a thread at termination. In particular, one should not
  2624.     kill a thread with many opened sockets - there will be an outflow
  2625.     of resources.
  2626.   * The current implementation does no checks on correctness
  2627.     (function returns error only if thread tries to close not opened
  2628.     socket with correct handle).
  2629.  
  2630. ======================================================================
  2631. ============== Function 53, subfunction 2 - poll socket. =============
  2632. ======================================================================
  2633. Parameters:
  2634.   * eax = 53 - function number
  2635.   * ebx = 2 - subfunction number
  2636.   * ecx = socket handle
  2637. Returned value:
  2638.   * eax = number of read bytes
  2639.   * ebx destroyed
  2640. Remarks:
  2641.   * There is no checks for correctness.
  2642.  
  2643. ======================================================================
  2644. ========= Function 53, subfunction 3 - read byte from socket. ========
  2645. ======================================================================
  2646. Parameters:
  2647.   * eax = 53 - function number
  2648.   * ebx = 3 - subfunction number
  2649.   * ecx = socket handle
  2650. Returned value:
  2651.   * if there is no read data: eax=0, bl=0,
  2652.     other bytes of ebx are destroyed
  2653.   * if there are read data: eax=number of rest bytes
  2654.     (possibly 0), bl=read byte, other bytes of ebx are destroyed
  2655. Remarks:
  2656.   * There is no checks for correctness.
  2657.  
  2658. ======================================================================
  2659. ========== Function 53, subfunction 4 - write to UDP-socket. =========
  2660. ======================================================================
  2661. Parameters:
  2662.   * eax = 53 - function number
  2663.   * ebx = 4 - subfunction number
  2664.   * ecx = socket handle
  2665.   * edx = number of bytes to write
  2666.   * esi = pointer to data to write
  2667. Returned value:
  2668.   * eax = 0xffffffff - invalid handle
  2669.   * eax = 0xffff - not enough memory
  2670.   * eax = 0 - success
  2671.   * ebx destroyed
  2672. Remarks:
  2673.   * Check on validity of handle is minimal - only not very incorrect
  2674.     not opened handles are eliminated.
  2675.   * Number of bytes to write must not exceed 1500-28, though
  2676.     the appropriate check is not made.
  2677.  
  2678. ======================================================================
  2679. ============ Function 53, subfunction 5 - open TCP-socket. ===========
  2680. ======================================================================
  2681. Parameters:
  2682.   * eax = 53 - function number
  2683.   * ebx = 5 - subfunction number
  2684.   * ecx = local port (only low word is taken into account)
  2685.   * edx = remote port (only low word is taken into account)
  2686.   * esi = remote IP
  2687.   * edi = open mode: SOCKET_PASSIVE=0 or SOCKET_ACTIVE=1
  2688. Returned value:
  2689.   * eax = -1 = 0xFFFFFFFF - error; ebx destroys
  2690.   * eax = socket handle (some number which unambiguously identifies
  2691.     socket and have sense only for the system) - success;
  2692.     ebx destroyed
  2693.  
  2694. ======================================================================
  2695. ========= Function 53, subfunction 6 - get TCP-socket status. ========
  2696. ======================================================================
  2697. Parameters:
  2698.   * eax = 53 - function number
  2699.   * ebx = 6 - subfunction number
  2700.   * ecx = socket handle
  2701. Returned value:
  2702.   * eax = socket status: one of
  2703.   * TCB_LISTEN = 1
  2704.   * TCB_SYN_SENT = 2
  2705.   * TCB_SYN_RECEIVED = 3
  2706.   * TCB_ESTABLISHED = 4
  2707.   * TCB_FIN_WAIT_1 = 5
  2708.   * TCB_FIN_WAIT_2 = 6
  2709.   * TCB_CLOSE_WAIT = 7
  2710.   * TCB_CLOSING = 8
  2711.   * TCB_LAST_ASK = 9
  2712.   * TCB_TIME_WAIT = 10
  2713.   * TCB_CLOSED = 11
  2714.   * ebx destroys
  2715. Remarks:
  2716.   * There is no checks for correctness.
  2717.  
  2718. ======================================================================
  2719. ========== Function 53, subfunction 7 - write to TCP-socket. =========
  2720. ======================================================================
  2721. Parameters:
  2722.   * eax = 53 - function number
  2723.   * ebx = 7 - subfunction number
  2724.   * ecx = socket handle
  2725.   * edx = number of bytes to write
  2726.   * esi = pointer to data to write
  2727. Returned value:
  2728.   * eax = 0xffffffff - error
  2729.   * eax = 0xffff - not enough memory
  2730.   * eax = 0 - success
  2731.   * ebx destroyed
  2732. Remarks:
  2733.   * Check on validity of handle is minimal - only not very incorrect
  2734.     not opened handles are eliminated.
  2735.   * Number of bytes to write must not exceed 1500-40, though
  2736.     the appropriate check is not made.
  2737.  
  2738. ======================================================================
  2739. =========== Function 53, subfunction 8 - close TCP-socket. ===========
  2740. ======================================================================
  2741. Parameters:
  2742.   * eax = 53 - function number
  2743.   * ebx = 8 - subfunction number
  2744.   * ecx = socket handle
  2745. Returned value:
  2746.   * eax = -1 - invalid handle
  2747.   * eax = 0xffff - not enough memory for socket close packet
  2748.   * eax = 0 - success
  2749.   * in many cases eax is destroyed (the result of function 'queue'
  2750.     is returned) - probably this is bug, which will be corrected
  2751.   * ebx destroyed
  2752. Remarks:
  2753.   * The current implementation does not close automatically all
  2754.     sockets of a thread at termination. In particular, one should not
  2755.     kill a thread with many opened sockets - there will be an outflow
  2756.     of resources.
  2757.   * The current implementation does no checks on correctness
  2758.     (function returns error only if thread tries to close not opened
  2759.     socket with correct handle).
  2760.  
  2761. ======================================================================
  2762. === Function 53, subfunction 9 - check whether local port is free. ===
  2763. ======================================================================
  2764. Parameters:
  2765.   * eax = 53 - function number
  2766.   * ebx = 9 - subfunction number
  2767.   * ecx = local port number (low 16 bits are used only)
  2768. Returned value:
  2769.   * eax = 0 - port is used
  2770.   * eax = 1 - port is free
  2771.   * ebx destroyed
  2772.  
  2773. ======================================================================
  2774. ===== Function 53, subfunction 10 - query Ethernet cable status. =====
  2775. ======================================================================
  2776. Parameters:
  2777.   * eax = 53 - function number
  2778.   * ebx = 10 - subfunction number
  2779. Returned value:
  2780.   * al = -1 - a network driver is not loaded or
  2781.               does not support this function
  2782.   * al = 0 - Ethernet cable is unplugged
  2783.   * al = 1 - Ethernet cable is plugged
  2784.   * ebx destroyed
  2785. Remarks:
  2786.   * The current kernel implementation supports this function
  2787.     only for RTL8139 network cards.
  2788.  
  2789. ======================================================================
  2790. ======= Function 53, subfunction 11 - read network stack data. =======
  2791. ======================================================================
  2792. Paramters:
  2793.   * eax = 53 - function number
  2794.   * ebx = 11 - subfunction number
  2795.   * ecx = socket handle
  2796.   * edx = pointer to buffer
  2797.   * esi = number of bytes to read;
  2798.   * esi = 0 - read all data (maximum 4096 bytes)
  2799. Returned value:
  2800.   * eax = number of bytes read
  2801.   * ebx destroyed
  2802. Remakrs:
  2803.   * There is no check on handle correctness.
  2804.  
  2805. ======================================================================
  2806. = Function 53, subfunction 255 - debug information of network driver.
  2807. ======================================================================
  2808. Parameters:
  2809.   * eax = 53 - function number
  2810.   * ebx = 255 - subfunction number
  2811.   * ecx = type of requested information (see below)
  2812. Returned value:
  2813.   * eax = requested information
  2814.   * ebx destroyed
  2815. Possible values for ecx:
  2816.   * 100: length of queue 0 (empty queue)
  2817.   * 101: length of queue 1 (ip-out queue)
  2818.   * 102: length of queue 2 (ip-in queue)
  2819.   * 103: length of queue 3 (net1out queue)
  2820.   * 200: number of items in the ARP table
  2821.   * 201: size of the ARP table (in items) (20 for current version)
  2822.   * 202: read item at edx of the ARP table to the temporary buffer,
  2823.     whence 5 following types take information;
  2824.     in this case eax is not defined
  2825.   * 203: IP-address saved by type 202
  2826.   * 204: high dword of MAC-address saved by type 202
  2827.   * 205: low word of MAC-address saved by type 202
  2828.   * 206: status word saved by type 202
  2829.   * 207: ttl word saved by type 202
  2830.   * 2: total number of received IP-packets
  2831.   * 3: total number of transferred IP-packets
  2832.   * 4: total number of dumped received packets
  2833.   * 5: total number of received ARP-packets
  2834.   * 6: status of packet driver, 0=inactive, nonzero=active
  2835.  
  2836. ======================================================================
  2837. ========== Function 55, subfunction 0 - load data for SB16. ==========
  2838. ======================================================================
  2839. Parameters:
  2840.   * eax = 55 - function number
  2841.   * ebx = 0 - subfunction number
  2842.   * ecx = pointer to data (is copied 64 kilobytes, is used as much as
  2843.     set by subfunction 2)
  2844. Returned value:
  2845.   * function does not return value
  2846. Remarks:
  2847.   * Format and size of data are set by subfunction 2.
  2848.  
  2849. ======================================================================
  2850. ======== Function 55, subfunction 1 - begin play data on SB16. =======
  2851. ======================================================================
  2852. Parameters:
  2853.   * eax = 55 - function number
  2854.   * ebx = 1 - subfunction number
  2855. Returned value:
  2856.   * function does not return value
  2857. Remarks:
  2858.   * Previously data must be loaded by subfunction 0 and
  2859.     their format must be defined by subfunction 2.
  2860.   * Function returns control, when playing of data began; after that
  2861.     play goes independently from application (and does not use
  2862.     processor time at all).
  2863.   * Previously must be defined SB16 base port
  2864.     (by subfunction 4 of function 21) and DMA channel
  2865.     (by subfunction 10 of function 21).
  2866.  
  2867. ======================================================================
  2868. ======== Function 55, subfunction 2 - set format of SB16 data. =======
  2869. ======================================================================
  2870. Parameters:
  2871.   * eax = 55 - function number
  2872.   * ebx = 2 - subfunction number
  2873.   * ecx = 0 - set digit capacity
  2874.     * edx = 1 - 8bit mono
  2875.     * edx = 2 - 8bit stereo
  2876.   * ecx = 1 - set data size
  2877.     * edx = size in bytes
  2878.   * ecx = 2 - set play frequency
  2879.     * edx = frequency
  2880. Returned value:
  2881.   * function does not return value
  2882. Remarks:
  2883.   * When the system boots, it sets following default parameters:
  2884.     digit capacity - 8bit mono, size - 64 Kb, frequency - 44100 Hz.
  2885.     Nevertheless it is recommended to set necessary values obviously
  2886.     as they could be reset by some application.
  2887.  
  2888. ======================================================================
  2889.  Function 55, subfunction 55 - begin to play data on built-in speaker.
  2890. ======================================================================
  2891. Parameters:
  2892.   * eax = 55 - function number
  2893.   * ebx = 55 - subfunction number
  2894.   * esi = pointer to data
  2895. Returned value:
  2896.   * eax = 0 - success
  2897.   * eax = 55 - error (speaker is off or busy)
  2898. Data is an array of items with variable length.
  2899. Format of each item is defined by first byte:
  2900.   * 0 = end of data
  2901.   * 1..0x80 = sets sound duration on 1/100 of second; sound note
  2902.     is defined by immediate value of frequency
  2903.     * following word (2 bytes) contains frequency divider;
  2904.       frequency is defined as 1193180/divider
  2905.   * 0x81 = invalid
  2906.   * 0x82..0xFF = note is defined by octave and number:
  2907.     * duration in 1/100 of second = (first byte)-0x81
  2908.     * there is one more byte;
  2909.     * (second byte)=0xFF - delay
  2910.     * otherwise it looks like a*0x10+b, where b=number of the note in
  2911.       an octave from 1 to 12, a=number of octave (beginning from 0)
  2912. Remarks:
  2913.   * Speaker play can be disabled/enabled by
  2914.     subfunction 8 of function 18.
  2915.   * Function returns control, having informed the system
  2916.     an information on request. Play itself goes independently from
  2917.     the program.
  2918.   * The data must be kept in the memory at least up to the end
  2919.     of play.
  2920.  
  2921. ======================================================================
  2922. ======================= Function 57 - PCI BIOS. ======================
  2923. ======================================================================
  2924. Parameters:
  2925.   * eax = 57 - function number
  2926.   * ebp corresponds to al in PCI BIOS specification
  2927.   * other registers are set according to PCI BIOS specification
  2928. Returned value:
  2929.   * CF is undefined
  2930.   * other registers are set according to PCI BIOS specification
  2931. Remarks:
  2932.   * Many effects of this function can be also achieved with
  2933.     corresponding subfunctions of function 62.
  2934.   * The function calls PCI32 BIOS extension, documented e.g. in
  2935.     http://alpha1.dyns.net/files/PCI/bios21.pdf.
  2936.   * If BIOS does not support this extension, its behavior is emulated
  2937.     (through kernel-mode analogues of subfunctions of function 62).
  2938.  
  2939. ======================================================================
  2940. ================ Function 58 - work with file system. ================
  2941. ======================================================================
  2942. Parameters:
  2943.   * eax = 58
  2944.   * ebx = pointer to the information structure
  2945. Returned value:
  2946.   * eax = 0 - success; otherwise file system error code
  2947.   * some subfunctions return value in other registers too
  2948. General format of the information structure:
  2949.   * +0: dword: subfunction number
  2950.   * +4: dword: number of block
  2951.   * +8: dword: size
  2952.   * +12 = +0xC: dword: pointer to data
  2953.   * +16 = +0x10: dword: pointer to a memory for system operations
  2954.     (4096 bytes)
  2955.   * +20 = +0x14: n db: ASCIIZ-string with the file name
  2956. Specifications - in documentation on the appropriate subfunction.
  2957. Filename is case-insensitive for latin letters, russian letters
  2958. must be capital.
  2959. Format of filename:
  2960. /base/number/dir1/dir2/.../dirn/file,
  2961. where /base/number identifies device, on which file is located:
  2962. one of
  2963.   * /RD/1 = /RAMDISK/1 to access ramdisk
  2964.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  2965.     /FD/2 = /FLOPPYDISK/2 to access second one
  2966.   * /HD/x = /HARDDISK/x - obsolete variant of access to hard disk
  2967.     (in this case base is defined by subfunction 7 of function 21),
  2968.     x - partition number (beginning from 1)
  2969.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  2970.     IDE0 (Primary Master), IDE1 (Primary Slave),
  2971.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  2972.     x - partition number on the selected hard drive, varies from 1
  2973.     to 255 (on each hard drive the indexing starts from 1)
  2974. Remarks:
  2975.   * In the first two cases it is also possible to use FIRST
  2976.     instead of 1, SECOND instead of 2, but it is not recommended
  2977.     for convenience of transition to the future extensions.
  2978.   * Limitation n<=39 is imposed.
  2979.   * Names of folders and file dir1,...,dirn,file must have the
  2980.     format 8.3: name no more than 8 characters, dot, extension no
  2981.     more than 3 characters. Trailing spaces are ignored, no other
  2982.     spaces is allowed. If name occupies equally 8 characters,
  2983.     dot may be omitted (though it is not recommended to use this
  2984.     feature for convenience of transition to the future extensions).
  2985.   * This function does not support folders on ramdisk.
  2986. Examples:
  2987.   * '/RAMDISK/FIRST/KERNEL.ASM',0
  2988.     '/rd/1/kernel.asm',0
  2989.   * '/HD0/1/kernel.asm',0
  2990.   * '/hd0/1/menuet/pics/tanzania.bmp',0
  2991. Existing subfunctions:
  2992.   * subfunction 0 - read file/folder
  2993.   * subfunction 8 - LBA-read from device
  2994.   * subfunction 15 - get file system information
  2995.  
  2996. ======================================================================
  2997. =========== Function 58, subfunction 0 - read file/folder. ===========
  2998. ======================================================================
  2999. Parameters:
  3000.   * eax = 58
  3001.   * ebx = pointer to the information structure
  3002. Format of the information structure:
  3003.   * +0: dword: 0 = subfunction number
  3004.   * +4: dword: first block to read (beginning from 0)
  3005.   * +8: dword: amount of blocks to read
  3006.   * +12 = +0xC: dword: pointer to buffer for data
  3007.   * +16 = +0x10: dword: pointer to buffer for system operations
  3008.     (4096 bytes)
  3009.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  3010.     given in the general description
  3011. Returned value:
  3012.   * eax = 0 - success, otherwise file system error code
  3013.   * ebx = file size (in bytes) or -1=0xffffffff, if file was not found
  3014. Remarks:
  3015.   * Block size is 512 bytes.
  3016.   * This function is obsolete, for reading files use subfunction 0
  3017.     of function 70, for reading folders - subfunction 1 of
  3018.     function 70.
  3019.   * Function can read contents of a folder. Only FAT file system is
  3020.     supported. The format of FAT-folder is described
  3021.     in any FAT documentation.
  3022.   * Size of a folder is determined by size of FAT clusters chain.
  3023.   * If file was ended before last requested block was read,
  3024.     the function will read as many as it can, and after that return
  3025.     eax=6 (EOF).
  3026.   * Function can read root folders /rd/1,/fd/x,/hd[n]/x, but
  3027.     in the first two cases the current implementation does not follow
  3028.     to the declared rules:
  3029.     for /rd/1:
  3030.     * if one want to read 0 blocks, function considers,
  3031.       that he requested 1;
  3032.     * if one requests more than 14 blocks or starting block is
  3033.       not less than 14, function returns eax=5 (not found) è ebx=-1;
  3034.     * size of ramdisk root folder is 14 blocks,
  3035.       0x1C00=7168 áàéò; but function returns ebx=0
  3036.       (except of the case of previous item);
  3037.     * strangely enough, it is possible to read 14th block (which
  3038.       generally contains a garbage - I remind, the indexing begins
  3039.       from 0);
  3040.     * if some block with the number not less than 14 was requested,
  3041.       function returns eax=6(EOF); otherwise eax=0.
  3042.     For /fd/x:
  3043.     * if the start block is not less than 14, function returns
  3044.       eax=5 (not found) and ebx=0;
  3045.     * note that format of FAT12 allows floppies with the root size
  3046.       more or less than 14 blocks;
  3047.     * check for length is not performed;
  3048.     * if data was successful read, function returns
  3049.       eax=0,ebx=0; otherwise eax=10 (access denied), ebx=-1.
  3050.   * The function handles reading of special folders /,/rd,/fd,/hd[n];
  3051.     but the result does not correspond to expected (on operations with
  3052.     normal files/folders), does not follow the declared rules,
  3053.     may be changed in future versions of the kernel and consequently
  3054.     is not described. To obtain the information about the equipment
  3055.     use subfunction 11 of function 18 or
  3056.     read corresponding folder with subfunction 1 of function 70.
  3057.  
  3058. ======================================================================
  3059. ========= Function 58, subfunction 8 - LBA-read from device. =========
  3060. ======================================================================
  3061. Parameters:
  3062.   * eax = 58 - function number
  3063.   * ebx = pointer to the information structure
  3064. Format of the information structure:
  3065.   * +0: dword: 8 = subfunction number
  3066.   * +4: dword: number of block to read (beginning from 0)
  3067.   * +8: dword: ignored (set to 1)
  3068.   * +12 = +0xC: dword: pointer to buffer for data (512 bytes)
  3069.   * +16 = +0x10: dword: pointer to buffer for system operations
  3070.     (4096 bytes)
  3071.   * +20 = +0x14: ASCIIZ-name of device: case-insensitive, one of
  3072.     /rd/1 = /RamDisk/1, /hd/n = /HardDisk/n,
  3073.     1<=n<=4 - number of device: 1=IDE0, ..., 4=IDE3.
  3074.     Instead of digits it is allowed, though not recommended for
  3075.     convenience of transition to future extensions, to use
  3076.     'first','second','third','fourth'.
  3077. Returned value:
  3078.   * for device name /hd/xxx, where xxx is not in the list above:
  3079.     * eax = ebx = 1
  3080.   * for invalid device name (except for the previous case):
  3081.     * eax = 5
  3082.     * ebx does not change
  3083.   * if LBA-access is disabled by subfunction 11 of function 21:
  3084.     * eax = 2
  3085.     * ebx destroyed
  3086.   * for ramdisk: attempt to read block outside ramdisk
  3087.     (18*2*80 blocks) results in
  3088.     * eax = 3
  3089.     * ebx = 0
  3090.   * for successful read:
  3091.     * eax = ebx = 0
  3092. Remarks:
  3093.   * Block size is 512 bytes; function reads one block.
  3094.   * Do not depend on returned value, it can be changed
  3095.     in future versions.
  3096.   * Function requires that LBA-access to devices is enabled by
  3097.     subfunction 11 of function 21. To check this one can use
  3098.     subfunction 11 of function 26.
  3099.   * LBA-read of floppy is not supported.
  3100.   * Function reads data on physical hard drive; if for any reason
  3101.     data of the concrete partition are required, application must
  3102.     define starting sector of this partition (either directly
  3103.     through MBR, or from the full structure returned by
  3104.     ïîäôóíêöèåé 11 ôóíêöèè 18).
  3105.   * Function does not check error code of hard disk, so request of
  3106.     nonexisting sector reads something (most probably it will be
  3107.     zeroes, but this is defined by device) and this is considered
  3108.     as success (eax=0).
  3109.  
  3110. ======================================================================
  3111. ==== Function 58, subfunction 15 - get information on file system. ===
  3112. ======================================================================
  3113. Parameters:
  3114.   * eax = 58 - function number
  3115.   * ebx = pointer to the information structure
  3116. Format of the information structure:
  3117.   * +0: dword: 15 = subfunction number
  3118.   * +4: dword: ignored
  3119.   * +8: dword: ignored
  3120.   * +12 = +0xC: dword: ignored
  3121.   * +16 = +0x10: dword: ignored
  3122.   * +20 = +0x14: (only second character is checked)
  3123.     /rd=/RAMDISK or /hd=/HARDDISK
  3124. Returned value:
  3125.   * if the second character does not belong to set {'r','R','h','H'}:
  3126.     * eax = 3
  3127.     * ebx = ecx = dword [fileinfo] = 0
  3128.   * for ramdisk:
  3129.     * eax = 0 (success)
  3130.     * ebx = total number of clusters = 2847
  3131.     * ecx = number of free clusters
  3132.     * dword [fileinfo] = cluster size = 512
  3133.   * for hard disk: base and partition are defined by subfunctions
  3134.     7 and 8 of function 21:
  3135.     * eax = 0 (success)
  3136.     * ebx = total number of clusters
  3137.     * ecx = number of free clusters
  3138.     * dword [fileinfo] = cluster size (in bytes)
  3139. Remarks:
  3140.   * Be not surprised to strange layout of 4th returned parameter
  3141.     - when this code was writing, at system calls application got
  3142.     only registers eax,ebx,ecx (from pushad-structure transmitted
  3143.     as argument to the system function). Now it is corrected, so,
  3144.     probably, it is meaningful to return cluster size in edx, while
  3145.     this function is not used yet.
  3146.   * There exists also subfunction 11 of function 18,
  3147.     which returns information on file system. From the full table
  3148.     of disk subsystem it is possible to deduce cluster size (there
  3149.     it is stored in sectors) and total number of clusters
  3150.     for hard disks.
  3151.  
  3152. ======================================================================
  3153. ========== Function 60 - Inter Process Communication (IPC). ==========
  3154. ======================================================================
  3155. IPC is used for message dispatching from one process/thread to
  3156. another. Previously it is necessary to agree how to interpret
  3157. the concrete message.
  3158.  
  3159. ----------- Subfunction 1 - set the area for IPC receiving -----------
  3160. Is called by process-receiver.
  3161. Parameters:
  3162.   * eax = 60 - function number
  3163.   * ebx = 1 - subfunction number
  3164.   * ecx = pointer to the buffer
  3165.   * edx = size of the buffer
  3166. Returned value:
  3167.   * eax = 0 - always success
  3168. Format of IPC-buffer:
  3169.   * +0: dword: if nonzero, buffer is considered locked;
  3170.     lock/unlock the buffer, when you work with it and need that
  3171.     buffer data are not changed from outside (no new messages)
  3172.   * +4: dword: occupied place in the buffer (in bytes)
  3173.   * +8: first message
  3174.   * +8+n: second message
  3175.   * ...
  3176. Format of a message:
  3177.   * +0: dword: PID of sender
  3178.   * +4: dword: message length (not including this header)
  3179.   * +8: n*byte: message data
  3180.  
  3181. ------------------ Subfunction 2 - send IPC message ------------------
  3182. Is called by process-sender.
  3183. Parameters:
  3184.   * eax = 60 - function number
  3185.   * ebx = 2 - subfunction number
  3186.   * ecx = PID of receiver
  3187.   * edx = pointer to the message data
  3188.   * esi = message length (in bytes)
  3189. Returned value:
  3190.   * eax = 0 - success
  3191.   * eax = 1 - the receiver has not defined buffer for IPC messages
  3192.     (can be, still have no time,
  3193.     and can be, this is not right process)
  3194.   * eax = 2 - the receiver has blocked IPC-buffer; try to wait a bit
  3195.   * eax = 3 - overflow of IPC-buffer of the receiver
  3196.   * eax = 4 - process/thread with such PID does not exist
  3197. Remarks:
  3198.   * Immediately after writing of IPC-message to the buffer the system
  3199.     sends to the receiver the event with code 7 (see event codes).
  3200.  
  3201. ======================================================================
  3202. ==== Function 61 - get parameters for the direct graphics access. ====
  3203. ======================================================================
  3204. The data of the graphics screen (the memory area which displays
  3205. screen contents) are accessible to a program directly, without
  3206. any system calls, through the selector gs:
  3207.         mov     eax, [gs:0]
  3208. places in eax the first dword of the buffer, which contains
  3209. information on color of the left upper point (and, possibly, colors
  3210. of several following).
  3211.         mov     [gs:0], eax
  3212. by work in VESA modes with LFB sets color of the left upper point
  3213. (and, possibly, colors of several following).
  3214. To interpret the data of graphics screen program needs to know
  3215. some parameters, returning by this function.
  3216. Remarks:
  3217.   * Graphics parameters changes very seldom at work,
  3218.     namely, only in cases, when user works with the application VRR.
  3219.   * At videomode change the system redraws all windows (event
  3220.     with code 1) and redraws the background (event 5).
  3221.     Same events occur in other cases too, which meet much more often,
  3222.     than videomode change.
  3223.   * By operation in videomodes with LFB the selector gs points to
  3224.     LFB itself, so reading/writing on gs result directly in
  3225.     change of screen contents. By operation in videomodes without
  3226.     LFB gs points to some data area in the kernel, and all functions
  3227.     of screen output fulfil honesty double operation on writing
  3228.     directly to the screen and writing to this buffer. In result
  3229.     at reading contents of this buffer the results correspond to
  3230.     screen contents (with, generally speaking, large color
  3231.     resolution), and writing is ignored.
  3232.     One exception is the mode 320*200, for which main loop of the
  3233.     system thread updates the screen according to mouse movements.
  3234.  
  3235. ------------------------- Screen resolution --------------------------
  3236. Parameters:
  3237.   * eax = 61 - function number
  3238.   * ebx = 1 - subfunction number
  3239. Returned value:
  3240.   * eax = [resolution on x axis]*65536 + [resolution on y axis]
  3241. Remarks:
  3242.   * One can use function 14 paying attention that
  3243.     it returns sizes on 1 pixel less. It is fully equivalent way.
  3244.  
  3245. ---------------------- Number of bits per pixel ----------------------
  3246. Parameters:
  3247.   * eax = 61 - function number
  3248.   * ebx = 2 - subfunction number
  3249. Returned value:
  3250.   * eax = number of bits per pixel (24 or 32)
  3251.  
  3252. -------------------- Number of bytes per scanline --------------------
  3253. Parameters:
  3254.   * eax = 61 - function number
  3255.   * ebx = 3 - subfunction number
  3256. Returned value:
  3257.   * eax = number of bytes occupied by one scanline
  3258.     (horizontal line on the screen)
  3259.  
  3260. ======================================================================
  3261. ===== Function 62, subfunction 0 - get version of PCI-interface. =====
  3262. ======================================================================
  3263. Parameters:
  3264.   * eax = 62 - function number
  3265.   * bl = 0 - subfunction number
  3266. Returned value:
  3267.   * eax = -1 - PCI access is disabled; otherwise
  3268.   * ah.al = version of PCI-interface (ah=version, al=subversion)
  3269.   * high word of eax is zeroed
  3270. Remarks:
  3271.   * Previously low-level access to PCI for applications must be
  3272.     enabled by subfunction 12 of function 21.
  3273.   * If PCI BIOS is not supported, the value of ax is undefined.
  3274.  
  3275. ======================================================================
  3276. ==== Function 62, subfunction 1 - get number of the last PCI-bus. ====
  3277. ======================================================================
  3278. Parameters:
  3279.   * eax = 62 - function number
  3280.   * bl = 1 - subfunction number
  3281. Returned value:
  3282.   * eax = -1 - access to PCI is disabled; otherwise
  3283.   * al = number of the last PCI-bus; other bytes of eax are destroyed
  3284. Remarks:
  3285.   * Previously low-level access to PCI for applications must be
  3286.     enabled by subfunction 12 of function 21.
  3287.   * If PCI BIOS is not supported, the value of ax is undefined.
  3288.  
  3289. ======================================================================
  3290. ===================== Function 62, subfunction 2 =====================
  3291. ===== Get mechanism of addressing to the PCI configuration space. ====
  3292. ======================================================================
  3293. Parameters:
  3294.   * eax = 62 - function number
  3295.   * bl = 2 - subfunction number
  3296. Returned value:
  3297.   * eax = -1 - access to PCI is disabled; otherwise
  3298.   * al = mechanism (1 or 2); other bytes of eax are destroyed
  3299. Remarks:
  3300.   * Previously low-level access to PCI for applications must be
  3301.     enabled by subfunction 12 of function 21.
  3302.   * Addressing mechanism is selected depending on
  3303.     equipment characteristics.
  3304.   * Subfunctions of read and write work automatically
  3305.     with the selected mechanism.
  3306.  
  3307. ======================================================================
  3308. ======== Function 62, subfunctions 4,5,6 - read PCI-register. ========
  3309. ======================================================================
  3310. Parameters:
  3311.   * eax = 62 - function number
  3312.   * bl = 4 - read byte
  3313.   * bl = 5 - read word
  3314.   * bl = 6 - read dword
  3315.   * bh = number of PCI-bus
  3316.   * ch = dddddfff, where ddddd = number of the device on the bus,
  3317.     fff = function number of device
  3318.   * cl = number of register (must be even for bl=5,
  3319.     divisible by 4 for bl=6)
  3320. Returned value:
  3321.   * eax = -1 - error (access to PCI is disabled or parameters
  3322.     are not supported); otherwise
  3323.   * al/ax/eax (depending on requested size) contains the data;
  3324.     the other part of register eax is destroyed
  3325. Remarks:
  3326.   * Previously low-level access to PCI for applications must be
  3327.     enabled by subfunction 12 of function 21.
  3328.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  3329.     function number. To get access mechanism use subfunction 2.
  3330.   * Some registers are standard and exist for all devices, some are
  3331.     defined by the concrete device. The list of registers of the
  3332.     first type can be found e.g. in famous
  3333.     Interrupt List by Ralf Brown
  3334.     (http://www.pobox.com/~ralf/files.html,
  3335.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/);
  3336.     registers of the second type must be listed
  3337.     in the device documentation.
  3338.  
  3339. ======================================================================
  3340. ====== Function 62, subfunctions 8,9,10 - write to PCI-register. =====
  3341. ======================================================================
  3342. Parameters:
  3343.   * eax = 62 - function number
  3344.   * bl = 8 - write byte
  3345.   * bl = 9 - write word
  3346.   * bl = 10 - write dword
  3347.   * bh = number of PCI-bus
  3348.   * ch = dddddfff, where ddddd = number of the device on the bus,
  3349.     fff = function number of device
  3350.   * cl = number of register (must be even for bl=9,
  3351.     divisible by 4 for bl=10)
  3352.   * dl/dx/edx (depending on requested size) contatins
  3353.     the data to write
  3354. Returned value:
  3355.   * eax = -1 - error (access to PCI is disabled or parameters
  3356.     are not supported)
  3357.   * eax = 0 - success
  3358. Remarks:
  3359.   * Previously low-level access to PCI for applications must be
  3360.     enabled by subfunction 12 of function 21.
  3361.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  3362.     function number. To get access mechanism use subfunction 2.
  3363.   * Some registers are standard and exist for all devices, some are
  3364.     defined by the concrete device. The list of registers of the
  3365.     first type can be found e.g. in famous Interrupt List by
  3366.     Ralf Brown; registers of the second type must be listed
  3367.     in the device documentation.
  3368.  
  3369. ======================================================================
  3370. ============== Function 63 - work with the debug board. ==============
  3371. ======================================================================
  3372. The debug board is the global system buffer (with the size
  3373. 1024 bytes), to which any program can write (generally speaking,
  3374. arbitrary) data and from which other program can read these data.
  3375. By the agreement written data are text strings interpreted as
  3376. debug messages on a course of program execution. The kernel in
  3377. some situations also writes to the debug board information on
  3378. execution of some functions; by the agreement kernel messages
  3379. begins from the prefix "K : ".
  3380. For view of the debug board the application 'board' was created,
  3381. which reads data from the buffer and displays them in its window.
  3382. 'board' interpretes the sequence of codes 13,10 as newline.
  3383. A character with null code in an end of line is not necessary,
  3384. but also does not prevent.
  3385. Because debugger has been written, the value of the debug board
  3386. has decreased, as debugger allows to inspect completely a course of
  3387. program execution without any efforts from the direction of program
  3388. itself. Nevertheless in some cases the debug board is still useful.
  3389.  
  3390. ----------------------------- Write byte -----------------------------
  3391. Parameters:
  3392.   * eax = 63 - function number
  3393.   * ebx = 1 - subfunction number
  3394.   * cl = data byte
  3395. Returned value:
  3396.   * function does not return value
  3397. Remarks:
  3398.   * Byte is written to the buffer. Buffer size is 512 bytes.
  3399.     At buffer overflow all obtained data are lost.
  3400.   * For output to the debug board of more complicated objects
  3401.     (strings, numbers) it is enough to call this function in cycle.
  3402.     It is possible not to write the appropriate code manually and use
  3403.     file 'debug.inc', which is included into the distributive.
  3404.  
  3405. ----------------------------- Read byte ------------------------------
  3406. Takes away byte from the buffer.
  3407. Parameters:
  3408.   * eax = 63 - function number
  3409.   * ebx = 2 - subfunction number
  3410. Returned value:
  3411.   * eax = ebx = 0 - the buffer is empty
  3412.   * eax = byte, ebx = 1 - byte was successfully read
  3413.  
  3414. ======================================================================
  3415. ============== Function 64 - resize application memory. ==============
  3416. ======================================================================
  3417. Parameters:
  3418.   * eax = 64 - function number
  3419.   * ebx = 1 - unique subfunction
  3420.   * ecx = new memory size
  3421. Returned value:
  3422.   * eax = 0 - success
  3423.   * eax = 1 - not enough memory
  3424. Remarks:
  3425.   * There is another way to dynamically allocate/free memory -
  3426.     subfunctions 11, 12, 13 of function 68.
  3427.   * The function cannot be used together with 68.11, 68.12, 68.13.
  3428.     The function call will be ignored after creation of process heap
  3429.     with function 68.11.
  3430.  
  3431. ======================================================================
  3432. ======== Function 65 - draw image with palette in the window. ========
  3433. ======================================================================
  3434. Parameters:
  3435.   * eax = 65 - function number
  3436.   * ebx = pointer to the image
  3437.   * ecx = [size on axis x]*65536 + [size on axis y]
  3438.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  3439.   * esi = number of bits per pixel, must be 8, 24 or 32
  3440.   * edi = pointer to palette (256 colors 0x00RRGGBB);
  3441.           ignored when esi = 24 and 32
  3442.   * ebp = offset of next row data relative to previous row data
  3443. Returned value:
  3444.   * function does not return value
  3445. Remarks:
  3446.   * Coordinates of the image are coordinates of the upper left corner
  3447.     of the image relative to the window.
  3448.   * Size of the image in bytes is xsize*ysize.
  3449.   * Each byte of image is index in the palette.
  3450.   * If the image uses less than 256 colors, palette size may be
  3451.     less than 256 too.
  3452.   * The call to function 7 is equivalent to call to this function
  3453.     with esi=24, ebp=0.
  3454.  
  3455. ======================================================================
  3456. ================== Function 66 - work with keyboard. =================
  3457. ======================================================================
  3458. The input mode influences results of reading keys by function 2.
  3459. When a program loads, ASCII input mode is set for it.
  3460.  
  3461. -------------- Subfunction 1 - set keyboard input mode. --------------
  3462. Parameters:
  3463.   * eax = 66 - function number
  3464.   * ebx = 1 - subfunction number
  3465.   * ecx = mode:
  3466.     * 0 = normal (ASCII-characters)
  3467.     * 1 = scancodes
  3468. Returned value:
  3469.   * function does not return value
  3470.  
  3471. -------------- Subfunction 2 - get keyboard input mode. --------------
  3472. Parameters:
  3473.   * eax = 66 - function number
  3474.   * ebx = 2 - subfunction number
  3475. Returned value:
  3476.   * eax = current mode
  3477.  
  3478. ------------ Subfunction 3 - get status of control keys. -------------
  3479. Parameters:
  3480.   * eax = 66 - function number
  3481.   * ebx = 3 - subfunction number
  3482. Returned value:
  3483.   * eax = bit mask:
  3484.   * bit 0 (mask 1): left Shift is pressed
  3485.   * bit 1 (mask 2): right Shift is pressed
  3486.   * bit 2 (mask 4): left Ctrl is pressed
  3487.   * bit 3 (mask 8): right Ctrl is pressed
  3488.   * bit 4 (mask 0x10): left Alt is pressed
  3489.   * bit 5 (mask 0x20): right Alt is pressed
  3490.   * bit 6 (mask 0x40): CapsLock is on
  3491.   * bit 7 (mask 0x80): NumLock is on
  3492.   * bit 8 (mask 0x100): ScrollLock is on
  3493.   * other bits are cleared
  3494.  
  3495. -------------- Subfunction 4 - set system-wide hotkey. ---------------
  3496. When hotkey is pressed, the system notifies only those applications,
  3497. which have installed it; the active application (which receives
  3498. all normal input) does not receive such keys.
  3499. The notification consists in sending event with the code 2.
  3500. Reading hotkey is the same as reading normal key - by function 2.
  3501. Parameters:
  3502.   * eax = 66 - function number
  3503.   * ebx = 4 - subfunction number
  3504.   * cl determines key scancode;
  3505.     use cl=0 to give combinations such as Ctrl+Shift
  3506.   * edx = 0xXYZ determines possible states of control keys:
  3507.     * Z (low 4 bits) determines state of LShift and RShift:
  3508.       * 0 = no key must be pressed;
  3509.       * 1 = exactly one key must be pressed;
  3510.       * 2 = both keys must be pressed;
  3511.       * 3 = must be pressed LShift, but not RShift;
  3512.       * 4 = must be pressed RShift, but not LShift
  3513.     * Y - similar for LCtrl and RCtrl;
  3514.     * X - similar for LAlt and RAlt
  3515. Returned value:
  3516.   * eax=0 - success
  3517.   * eax=1 - too mant hotkeys (maximum 256 are allowed)
  3518. Remarks:
  3519.   * Hotkey can work either at pressing or at release. Release
  3520.     scancode of a key is more on 128 than pressing scancode
  3521.     (i.e. high bit is set).
  3522.   * Several applications can set the same combination;
  3523.     all such applications will be informed on pressing
  3524.     such combination.
  3525.  
  3526. -------------- Subfunction 5 - delete installed hotkey. --------------
  3527. Parameters:
  3528.   * eax = 66 - function number
  3529.   * ebx = 5 - subfunction number
  3530.   * cl = scancode of key and edx = 0xXYZ the same as in subfunction 4
  3531. Returned value:
  3532.   * eax = 0 - success
  3533.   * eax = 1 - there is no such hotkey
  3534. Remarks:
  3535.   * When a process/thread terminates, all hotkey installed by it are
  3536.     deleted.
  3537.   * The call to this subfunction does not affect other applications.
  3538.     If other application has defined the same combination, it will
  3539.     still receive notices.
  3540.  
  3541. ======================================================================
  3542. ========= Function 67 - change position/sizes of the window. =========
  3543. ======================================================================
  3544. Parameters:
  3545.   * eax = 67 - function number
  3546.   * ebx = new x-coordinate of the window
  3547.   * ecx = new y-coordinate of the window
  3548.   * edx = new x-size of the window
  3549.   * esi = new y-size of the window
  3550. Returned value:
  3551.   * function does not return value
  3552. Remarks:
  3553.   * The value -1 for a parameter means "do not change"; e.g. to move
  3554.     the window without resizing it is possible to specify edx=esi=-1.
  3555.   * Previously the window must be defined by function 0.
  3556.     It sets initial coordinates and sizes of the window.
  3557.   * Sizes of the window are understood in sense of function 0,
  3558.     that is one pixel less than real sizes.
  3559.   * The function call for maximized windows is simply ignored.
  3560.   * For windows of appropriate styles position and/or sizes can be
  3561.     changed by user; current position and sizes can be obtained by
  3562.     call to function 9.
  3563.   * The function sends to the window redraw event (with the code 1).
  3564.  
  3565. ======================================================================
  3566. ====== Function 68, subfunction 0 - get the task switch counter. =====
  3567. ======================================================================
  3568. Parameters:
  3569.   * eax = 68 - function number
  3570.   * ebx = 0 - subfunction number
  3571. Returned value:
  3572.   * eax = number of task switches from the system booting
  3573.     (modulo 2^32)
  3574.  
  3575. ======================================================================
  3576. ======= Function 68, subfunction 1 - switch to the next thread. ======
  3577. ======================================================================
  3578. The function completes the current time slice allocated to the
  3579. thread and switches to the next. (Which thread in which process
  3580. will be next, is unpredictable). Later, when execution queue
  3581. will reach the current thread, execution will be continued.
  3582. Parameters:
  3583.   * eax = 68 - function number
  3584.   * ebx = 1 - subfunction number
  3585. Returned value:
  3586.   * function does not return value
  3587.  
  3588. ======================================================================
  3589. ============= Function 68, subfunction 2 - cache + rdpmc. ============
  3590. ======================================================================
  3591. Parameters:
  3592.   * eax = 68 - function number
  3593.   * ebx = 2 - subfunction number
  3594.   * ecx = required action:
  3595.     * ecx = 0 - enable instruction 'rdpmc'
  3596.       (ReaD Performance-Monitoring Counters) for applications
  3597.     * ecx = 1 - find out whether cache is disabled/enabled
  3598.     * ecx = 2 - enable cache
  3599.     * ecx = 3 - disable cache
  3600. Returned value:
  3601.   * for ecx=0:
  3602.     * eax = the value of cr4
  3603.   * for ecx=1:
  3604.     * eax = (cr0 and 0x60000000):
  3605.     * eax = 0 - cache is on
  3606.     * eax <> 0 - cache is off
  3607.   * for ecx=2 and ecx=3:
  3608.     * function does not return value
  3609.  
  3610. ======================================================================
  3611. =========== Function 68, subfunction 3 - read MSR-register. ==========
  3612. ======================================================================
  3613. MSR = Model Specific Register; the complete list of MSR-registers
  3614. of a processor is included to the documentation on it (for example,
  3615. IA-32 Intel Architecture Software Developer's Manual,
  3616. Volume 3, Appendix B); each processor family has its own subset
  3617. of the MSR-registers.
  3618. Parameters:
  3619.   * eax = 68 - function number
  3620.   * ebx = 3 - subfunction number
  3621.   * ecx is ignored
  3622.   * edx = MSR address
  3623. Returned value:
  3624.   * ebx:eax = high:low dword of the result
  3625. Remarks:
  3626.   * If ecx contains nonexistent or not implemented for this processor
  3627.     MSR, processor will generate an exception in the kernel, which
  3628.     will kill the thread.
  3629.   * Previously it is necessary to check, whether MSRs are supported
  3630.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3631.     will generate other exception in the kernel, which will anyway
  3632.     kill the thread.
  3633.  
  3634. ======================================================================
  3635. ========= Function 68, subfunction 4 - write to MSR-register. ========
  3636. ======================================================================
  3637. MSR = Model Specific Register; the complete list of MSR-registers
  3638. of a processor is included to the documentation on it (for example,
  3639. IA-32 Intel Architecture Software Developer's Manual,
  3640. Volume 3, Appendix B); each processor family has its own subset
  3641. of the MSR-registers.
  3642. Parameters:
  3643.   * eax = 68 - function number
  3644.   * ebx = 4 - subfunction number
  3645.   * ecx is ignored
  3646.   * edx = MSR address
  3647.   * esi:edi = high:low dword
  3648. Returned value:
  3649.   * function does not return value
  3650. Remarks:
  3651.   * If ecx contains nonexistent or not implemented for this processor
  3652.     MSR, processor will generate an exception in the kernel, which
  3653.     will kill the thread.
  3654.   * Previously it is necessary to check, whether MSRs are supported
  3655.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3656.     will generate other exception in the kernel, which will anyway
  3657.     kill the thread.
  3658.  
  3659. ======================================================================
  3660. ======= Function 68, subfunction 11 - initialize process heap. =======
  3661. ======================================================================
  3662. Parameters:
  3663.   * eax = 68 - function number
  3664.   * ebx = 11 - subfunction number
  3665. Returned value:
  3666.   * eax = 0 - failed
  3667.   * otherwise size of created heap
  3668. Remarks:
  3669.   * The function call initializes heap, from which one can in future
  3670.     allocate and free memory blocks with subfunctions 12 and 13.
  3671.     Heap size is equal to total amount of free application memory.
  3672.   * The second function call from the same process results in
  3673.     returning the size of the existing heap.
  3674.   * After creation of the heap calls to function 64 will be ignored.
  3675.  
  3676. ======================================================================
  3677. ======== Function 68, subfunction 12 - allocate memory block. ========
  3678. ======================================================================
  3679. Parameters:
  3680.   * eax = 68 - function number
  3681.   * ebx = 12 - subfunction number
  3682.   * ecx = required size in bytes
  3683. Returned value:
  3684.   * eax = pointer to the allocated block
  3685. Remarks:
  3686.   * Before this call one must initialize process heap by call to
  3687.     subfunction 11.
  3688.   * The function allocates an integer number of pages (4 Kb) in such
  3689.     way that the real size of allocated block is more than or equal to
  3690.     requested size.
  3691.  
  3692. ======================================================================
  3693. ========== Function 68, subfunction 13 - free memory block. ==========
  3694. ======================================================================
  3695. Parameters:
  3696.   * eax = 68 - function number
  3697.   * ebx = 13 - subfunction number
  3698.   * ecx = pointer to the memory block
  3699. Returned value:
  3700.   * eax = 1 - success
  3701.   * eax = 0 - failed
  3702. Remarks:
  3703.   * The memory block must have been allocated by subfunction 12
  3704.     or subfunction 20.
  3705.  
  3706. ======================================================================
  3707. ======== Function 68, subfunction 14 - wait for driver notify. =======
  3708. ======================================================================
  3709. Parameters:
  3710.   * eax = 68 - function number
  3711.   * ebx = 14 - subfunction number
  3712.   * ecx = pointer to the buffer for information (8 bytes)
  3713. Returned value:
  3714.   * buffer pointed to by ecx contains the following information:
  3715.     * +0: dword: constant EV_INTR = 1
  3716.     * +4: dword: driver data
  3717. Remarks:
  3718.   * The current implementation at wait time uses "heavy" operations
  3719.     of task switch.
  3720.  
  3721. ======================================================================
  3722. ====== Function 68, subfunction 15 - set FPU exception handler. ======
  3723. ======================================================================
  3724. Parameters:
  3725.   * eax = 68 - function number
  3726.   * ebx = 15 - subfunction number
  3727.   * ecx = address of the new exception handler
  3728. Returned value:
  3729.   * eax = address of the old exception handler (0, if it was not set)
  3730.  
  3731. ======================================================================
  3732. ============= Function 68, subfunction 16 - load driver. =============
  3733. ======================================================================
  3734. Parameters:
  3735.   * eax = 68 - function number
  3736.   * ebx = 16 - subfunction number
  3737.   * ecx = pointer to ASCIIZ-string with driver name
  3738. Returned value:
  3739.   * eax = 0 - failed
  3740.   * otherwise eax = driver handle
  3741. Remarks:
  3742.   * If the driver was not loaded yet, it is loaded;
  3743.     if the driver was loaded yet, nothing happens.
  3744.   * Driver name is case-sensitive.
  3745.     Maximum length of the name is 16 characters, including
  3746.     terminating null character, the rest is ignored.
  3747.   * Driver ABC is loaded from file /rd/1/drivers/ABC.obj.
  3748.  
  3749. ======================================================================
  3750. ============ Function 68, subfunction 17 - driver control. ===========
  3751. ======================================================================
  3752. Parameters:
  3753.   * eax = 68 - function number
  3754.   * ebx = 17 - subfunction number
  3755.   * ecx = pointer to the control structure:
  3756.     * +0: dword: handle of driver
  3757.     * +4: dword: code of driver function
  3758.     * +8: dword: pointer to input data
  3759.     * +12 = +0xC: dword: size of input data
  3760.     * +16 = +0x10: dword: pointer to output data
  3761.     * +20 = +0x14: dword: size of output data
  3762. Returned value:
  3763.   * eax = determined by driver
  3764. Remarks:
  3765.   * Function codes and the structure of input/output data
  3766.     are defined by driver.
  3767.   * Previously one must obtain driver handle by subfunction 16.
  3768.  
  3769. ======================================================================
  3770. ====== Function 68, subfunction 18 - set SSE exception handler. ======
  3771. ======================================================================
  3772. Parameters:
  3773.   * eax = 68 - function number
  3774.   * ebx = 15 - subfunction number
  3775.   * ecx = address of the new exception handler
  3776. Returned value:
  3777.   * eax = address of the old exception handler (0, if it was not set)
  3778.  
  3779. ======================================================================
  3780. =============== Function 68, subfunction 19 - load DLL. ==============
  3781. ======================================================================
  3782. Parameters:
  3783.   * eax = 68 - function number
  3784.   * ebx = 19 - subfunction number
  3785.   * ecx = pointer to ASCIIZ-string with the full path to DLL
  3786. Returned value:
  3787.   * eax = 0 - failed
  3788.   * otherwise eax = pointer to DLL export table
  3789. Remarks:
  3790.   * Export table is an array of structures of 2 dword's, terminated
  3791.     by zero. The first dword in structure points to function name,
  3792.     the second dword contains address of function.
  3793.  
  3794. ======================================================================
  3795. ======= Function 68, subfunction 20 - reallocate memory block. =======
  3796. ======================================================================
  3797. Parameters:
  3798.   * eax = 68 - function number
  3799.   * ebx = 20 - subfunction number
  3800.   * ecx = new size in bytes
  3801.   * edx = pointer to already allocated block
  3802. Returned value:
  3803.   * eax = pointer to the reallocated block, 0 = error
  3804. Remarks:
  3805.   * Before this call one must initialize process heap by call to
  3806.     subfunction 11.
  3807.   * The function allocates an integer number of pages (4 Kb) in such
  3808.     way that the real size of allocated block is more than or equal to
  3809.     requested size.
  3810.   * If edx=0, the function call is equivalent to memory allocation
  3811.     with subfunction 12. Otherwise the block at edx
  3812.     must be allocated earlier with subfunction 12 or this subfunction.
  3813.   * If ecx=0, the function frees memory block at edx and returns 0.
  3814.   * The contents of the block are unchanged up to the shorter of
  3815.     the new and old sizes.
  3816.  
  3817. ======================================================================
  3818. ====================== Fucntion 69 - debugging. ======================
  3819. ======================================================================
  3820. A process can load other process as debugged by set of corresponding
  3821. bit by call to subfunction 7 of function 70.
  3822. A process can have only one debugger; one process can debug some
  3823. others. The system notifies debugger on events occuring with
  3824. debugged process. Messages are written to the buffer defined by
  3825. subfunction 0.
  3826. Format of a message:
  3827.   * +0: dword: message code
  3828.   * +4: dword: PID of debugged process
  3829.   * +8: there can be additional data depending on message code
  3830. Message codes:
  3831.   * 1 = exception
  3832.     * in addition dword-number of the exception is given
  3833.     * process is suspended
  3834.   * 2 = process has terminated
  3835.     * comes at any termination: both through the system function -1,
  3836.       and at "murder" by any other process (including debugger itself)
  3837.   * 3 = debug exception int 1 = #DB
  3838.     * in addition dword-image of the register DR6 is given:
  3839.       * bits 0-3: condition of the corresponding breakpoint (set by
  3840.         subfunction 9) is satisfied
  3841.       * áèò 14: exception has occured because of the trace mode
  3842.         (flag TF is set TF)
  3843.     * process is suspended
  3844. When debugger terminates, all debugged processes are killed.
  3845. If debugger does not want this, it must previously detach by
  3846. subfunction 3.
  3847.  
  3848. All subfunctions except 4 and 5 are applicable only to
  3849. processes/threads started from the current by function 70
  3850. with set debugging flag.
  3851. Debugging of multithreaded programs is not supported yet.
  3852. The full list of subfunctions:
  3853.   * subfunction 0 - define data area for debug messages
  3854.   * subfunction 1 - get contents of registers of debugged thread
  3855.   * subfunction 2 - set contents of registers of debugged thread
  3856.   * subfunction 3 - detach from debugged process
  3857.   * subfunction 4 - suspend debugged thread
  3858.   * subfunction 5 - resume debugged thread
  3859.   * subfunction 6 - read from the memory of debugged process
  3860.   * subfunction 7 - write to the memory of debugged process
  3861.   * subfunction 8 - terminate debugged thread
  3862.   * subfunction 9 - set/clear hardware breakpoint
  3863.  
  3864. ======================================================================
  3865. = Function 69, subfunction 0 - define data area fror debug messages. =
  3866. ======================================================================
  3867. Parameters:
  3868.   * eax = 69 - function number
  3869.   * ebx = 0 - subfunction number
  3870.   * ecx = pointer
  3871. Format of data area:
  3872.   * +0: dword: N = buffer size (not including this header)
  3873.   * +4: dword: occupied place
  3874.   * +8: N*byte: buffer
  3875. Returned value:
  3876.   * function does not return value
  3877. Remarks:
  3878.   * If the size field is negative, the buffer is considered locked
  3879.     and at arrival of new message the system will wait.
  3880.     For synchronization frame all work with the buffer by operations
  3881.     lock/unlock
  3882.         neg     [bufsize]
  3883.   * Data in the buffer are considered as array of items with variable
  3884.     length - messages. Format of a message is explained in
  3885.     general description.
  3886.  
  3887. ======================================================================
  3888. ===================== Function 69, subfunction 1 =====================
  3889. ============ Get contents of registers of debugged thread. ===========
  3890. ======================================================================
  3891. Parameters:
  3892.   * eax = 69 - function number
  3893.   * ebx = 1 - subfunction number
  3894.   * ecx = thread identifier
  3895.   * edx = size of context structure, must be 0x28=40 bytes
  3896.   * esi = pointer to context structure
  3897. Returned value:
  3898.   * function does not return value
  3899. Format of context structure: (FPU is not supported yet)
  3900.   * +0: dword: eip
  3901.   * +4: dword: eflags
  3902.   * +8: dword: eax
  3903.   * +12 = +0xC: dword: ecx
  3904.   * +16 = +0x10: dword: edx
  3905.   * +20 = +0x14: dword: ebx
  3906.   * +24 = +0x18: dword: esp
  3907.   * +28 = +0x1C: dword: ebp
  3908.   * +32 = +0x20: dword: esi
  3909.   * +36 = +0x24: dword: edi
  3910. Remarks:
  3911.   * If the thread executes code of ring-0, the function returns
  3912.     contents of registers of ring-3.
  3913.   * Process must be loaded for debugging (as is shown in
  3914.     general description).
  3915.  
  3916. ======================================================================
  3917. ===================== Function 69, subfunction 2 =====================
  3918. ============ Set contents of registers of debugged thread. ===========
  3919. ======================================================================
  3920. Parameters:
  3921.   * eax = 69 - function number
  3922.   * ebx = 2 - subfunction number
  3923.   * ecx = thread identifier
  3924.   * edx = size of context structure, must be 0x28=40 bytes
  3925. Returned value:
  3926.   * function does not return value
  3927. Format of context structure is shown in the description of
  3928. subfunction 1.
  3929. Remarks:
  3930.   * If the thread executes code of ring-0, the function returns
  3931.     contents of registers of ring-3.
  3932.   * Process must be loaded for debugging (as is shown in
  3933.     general description).
  3934.  
  3935. ======================================================================
  3936. ===== Function 69, subfunction 3 - detach from debugged process. =====
  3937. ======================================================================
  3938. Parameters:
  3939.   * eax = 69 - function number
  3940.   * ebx = 3 - subfunction number
  3941.   * ecx = identifier
  3942. Returned value:
  3943.   * function does not return value
  3944. Remarks:
  3945.   * If the process was suspended, it resumes execution.
  3946.  
  3947. ======================================================================
  3948. ============= Function 69, subfunction 4 - suspend thread. ===========
  3949. ======================================================================
  3950. Parameters:
  3951.   * eax = 69 - function number
  3952.   * ebx = 4 - subfunction number
  3953.   * ecx = thread identifier
  3954. Returned value:
  3955.   * function does not return value
  3956.  
  3957. ======================================================================
  3958. ============= Function 69, subfunction 5 - resume thread. ============
  3959. ======================================================================
  3960. Parameters:
  3961.   * eax = 69 - function number
  3962.   * ebx = 5 - subfunction number
  3963.   * ecx = thread identifier
  3964. Returned value:
  3965.   * function does not return value
  3966.  
  3967. ======================================================================
  3968. = Fucntion 69, subfunction 6 - read from memory of debugged process. =
  3969. ======================================================================
  3970. Parameters:
  3971.   * eax = 69 - function number
  3972.   * ebx = 6 - subfunction number
  3973.   * ecx = identifier
  3974.   * edx = number of bytes to read
  3975.   * esi = address in the memory of debugged process
  3976.   * edi = pointer to buffer for data
  3977. Returned value:
  3978.   * eax = -1 at an error (invalid PID or buffer)
  3979.   * otherwise eax = number of read bytes (possibly, 0,
  3980.     if esi is too large)
  3981. Remarks:
  3982.   * Process must be loaded for debugging (as is shown in
  3983.     general description).
  3984.  
  3985. ======================================================================
  3986. == Function 69, subfunction 7 - write to memory of debugged process. =
  3987. ======================================================================
  3988. Parameters:
  3989.   * eax = 69 - function number
  3990.   * ebx = 7 - subfunction number
  3991.   * ecx = identifier
  3992.   * edx = number of bytes to write
  3993.   * esi = address of memory in debugged process
  3994.   * edi = pointer to data
  3995. Returned value:
  3996.   * eax = -1 at an error (invalid PID or buffer)
  3997.   * otherwise eax = number of written bytes (possibly, 0,
  3998.     if esi is too large)
  3999. Remarks:
  4000.   * Process must be loaded for debugging (as is shown in
  4001.     general description).
  4002.  
  4003. ======================================================================
  4004. ======= Function 69, subfunction 8 - terminate debugged thread. ======
  4005. ======================================================================
  4006. Parameters:
  4007.   * eax = 69 - function number
  4008.   * ebx = 8 - subfunction number
  4009.   * ecx = identifier
  4010. Returned value:
  4011.   * function does not return value
  4012. Remarks:
  4013.   * Process must be loaded for debugging (as is shown in
  4014.     general description).
  4015.   * The function is similar to subfunction 2 of function 18
  4016.     with two differences: it requires first remark and
  4017.     accepts PID rather than slot number.
  4018.  
  4019. ======================================================================
  4020. ===== Function 69, subfunction 9 - set/clear hardware breakpoint. ====
  4021. ======================================================================
  4022. Parameters:
  4023.   * eax = 69 - function number
  4024.   * ebx = 9 - subfunction number
  4025.   * ecx = thread identifier
  4026.   * dl = index of breakpoint, from 0 to 3 inclusively
  4027.   * dh = flags:
  4028.     * if high bit is cleared - set breakpoint:
  4029.       * bits 0-1 - condition:
  4030.         * 00 = breakpoint on execution
  4031.         * 01 = breakpoint on read
  4032.         * 11 = breakpoint on read/write
  4033.       * bits 2-3 - length; for breakpoints on exception it must be
  4034.         00, otherwise one of
  4035.         * 00 = byte
  4036.         * 01 = word
  4037.         * 11 = dword
  4038.       * esi = breakpoint address; must be aligned according to
  4039.         the length (i.e. must be even for word breakpoints,
  4040.         divisible by 4 for dword)
  4041.     * if high bit is set - clear breakpoint
  4042. Returned value:
  4043.   * eax = 0 - success
  4044.   * eax = 1 - error in the input data
  4045.   * eax = 2 - (reserved, is never returned in the current
  4046.     implementation) a global breakpoint with that index is already set
  4047. Remarks:
  4048.   * Process must be loaded for debugging (as is shown in
  4049.     general description).
  4050.   * Hardware breakpoints are implemented through DRx-registers of
  4051.     the processor, all limitations results from this.
  4052.   * The function can reinstall the breakpoint, previously set
  4053.     by it (and it does not inform on this).
  4054.     Carry on the list of set breakpoints in the debugger.
  4055.   * Breakpoints generate debug exception #DB, on which the system
  4056.     notifies debugger.
  4057.   * Breakpoints on write and read/write act after
  4058.     execution of the caused it instruction.
  4059.  
  4060. ======================================================================
  4061. ==== Function 70 - work with file system with long names support. ====
  4062. ======================================================================
  4063. Parameters:
  4064.   * eax = 70
  4065.   * ebx = pointer to the information structure
  4066. Returned value:
  4067.   * eax = 0 - success; otherwise file system error code
  4068.   * some subfunctions return value in other registers too
  4069. General format of the information structure:
  4070.   * +0: dword: subfunction number
  4071.   * +4: dword: file offset
  4072.   * +8: dword: high dword of offset (must be 0) or flags field
  4073.   * +12 = +0xC: dword: size
  4074.   * +16 = +0x10: dword: pointer to data
  4075.   * +20 = +0x14: n db: ASCIIZ-string with the filename
  4076.     or
  4077.   * +20 = +0x14: db 0
  4078.   * +21 = +0x15: dd pointer to ASCIIZ-string with the filename
  4079. Specifications - in documentation on the appropriate subfunction.
  4080. Filename is case-insensitive. Russian letters must be written in
  4081. the encoding cp866 (DOS).
  4082. Format of filename:
  4083. /base/number/dir1/dir2/.../dirn/file,
  4084. where /base/number identifies device, on which file is located:
  4085. one of
  4086.   * /RD/1 = /RAMDISK/1 to access ramdisk
  4087.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  4088.     /FD/2 = /FLOPPYDISK/2 to access second one
  4089.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  4090.     IDE0 (Primary Master), IDE1 (Primary Slave),
  4091.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  4092.     x - partition number on the selected hard drive, varies from 1
  4093.     to 255 (on each hard drive the indexing starts from 1)
  4094.   * /CD0/1, /CD1/1, /CD2/1, /CD3/1 to access accordingly to
  4095.     CD on IDE0 (Primary Master), IDE1 (Primary Slave),
  4096.     IDE2 (Secondary Master), IDE3 (Secondary Slave)
  4097.   * /SYS means system folder; with the usual boot (from floppy)
  4098.     is equivalent to /RD/1
  4099. Examples:
  4100.   * '/rd/1/kernel.asm',0
  4101.   * '/HD0/1/kernel.asm',0
  4102.   * '/hd0/2/menuet/pics/tanzania.bmp',0
  4103.   * '/hd0/1/Program files/NameOfProgram/SomeFile.SomeExtension',0
  4104.   * '/sys/MySuperApp.ini',0
  4105. Available subfunctions:
  4106.   * subfunction 0 - read file
  4107.   * subfunction 1 - read folder
  4108.   * subfunction 2 - create/rewrite file
  4109.   * subfunction 3 - write to existing file
  4110.   * subfunction 4 - set file size
  4111.   * subfunction 5 - get attributes of file/folder
  4112.   * subfunction 6 - set attributes of file/folder
  4113.   * subfunction 7 - start application
  4114.   * subfunction 8 - delete file/folder
  4115.   * subfunction 9 - create folder
  4116. For CD-drives due to hardware limitations only subfunctions
  4117. 0,1,5 and 7 are available, other subfunctions return error
  4118. with code 2.
  4119. At the first call of subfunctions 0,1,5,7 to ATAPI devices
  4120. (CD and DVD) the manual control of tray is locked due to caching
  4121. drive data. Unlocking is made when subfunction 4 of function 24
  4122. is called for corresponding device.
  4123.  
  4124. ======================================================================
  4125. === Function 70, subfunction 0 - read file with long names support. ==
  4126. ======================================================================
  4127. Parameters:
  4128.   * eax = 70 - function number
  4129.   * ebx = pointer to the information structure
  4130. Format of the information structure:
  4131.   * +0: dword: 0 = subfunction number
  4132.   * +4: dword: file offset (in bytes)
  4133.   * +8: dword: 0 (reserved for high dword of offset)
  4134.   * +12 = +0xC: dword: number of bytes to read
  4135.   * +16 = +0x10: dword: pointer to buffer for data
  4136.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4137.     given in the general description
  4138.     or
  4139.   * +20 = +0x14: db 0
  4140.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4141. Returned value:
  4142.   * eax = 0 - success, otherwise file system error code
  4143.   * ebx = number of read bytes or -1=0xffffffff if file was not found
  4144. Remarks:
  4145.   * If file was ended before last requested block was read,
  4146.     the function will read as many as it can, and after that return
  4147.     eax=6 (EOF).
  4148.   * The function does not allow to read folder (returns eax=10,
  4149.     access denied).
  4150.  
  4151. ======================================================================
  4152. == Function 70, subfunction 1 - read folder with long names support. =
  4153. ======================================================================
  4154. Parameters:
  4155.   * eax = 70 - function number
  4156.   * ebx = pointer to the information structure
  4157. Format of the information structure:
  4158.   * +0: dword: 1 = subfunction number
  4159.   * +4: dword: index of starting block (beginning from 0)
  4160.   * +8: dword: flags field:
  4161.     * bit 0 (mask 1): in what format to return names,
  4162.       0=ANSI, 1=UNICODE
  4163.     * other bits are reserved and must be set to 0 for the future
  4164.       compatibility
  4165.   * +12 = +0xC: dword: number of blocks to read
  4166.   * +16 = +0x10: dword: pointer to buffer for data, buffer size
  4167.     must be not less than 32 + [+12]*560 bytes
  4168.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  4169.     given in the general description
  4170.     or
  4171.   * +20 = +0x14: db 0
  4172.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4173. Returned value:
  4174.   * eax = 0 - success, otherwise file system error code
  4175.   * ebx = number of files, information on which was written to
  4176.     the buffer, or -1=0xffffffff, if folder was not found
  4177. Structure of the buffer:
  4178.   * +0: 32*byte: header
  4179.   * +32 = +0x20: n1*byte: block with information on file 1
  4180.   * +32+n1: n2*byte: block with information on file 2
  4181.   * ...
  4182. Structure of header:
  4183.   * +0: dword: version of structure (current is 1)
  4184.   * +4: dword: number of placed blocks; is not greater than requested
  4185.     in the field +12 of information structure; can be less, if
  4186.     there are no more files in folder (the same as in ebx)
  4187.   * +8: dword: total number of files in folder
  4188.   * +12 = +0xC: 20*byte: reserved (zeroed)
  4189. Structure of block of data for folder entry (BDFE):
  4190.   * +0: dword: attributes of file:
  4191.     * bit 0 (mask 1): file is read-only
  4192.     * bit 1 (mask 2): file is hidden
  4193.     * bit 2 (mask 4): file is system
  4194.     * bit 3 (mask 8): this is not a file but volume label
  4195.       (for one partition meets no more than once and
  4196.       only in root folder)
  4197.     * bit 4 (mask 0x10): this is a folder
  4198.     * bit 5 (mask 0x20): file was not archived - many archivation
  4199.       programs have an option to archive only files with this bit set,
  4200.       and after archiving this bit is cleared - it can be useful
  4201.       for automatically creating of backup-archives as at writing
  4202.       this bit is usually set
  4203.   * +4: byte: type of name data:
  4204.     (coincides with bit 0 of flags in the information structure)
  4205.     * 0 = ASCII = 1-byte representation of each character
  4206.     * 1 = UNICODE = 2-byte representation of each character
  4207.   * +5: 3*byte: reserved (zero)
  4208.   * +8: 4*byte: time of file creation
  4209.   * +12 = +0xC: 4*byte: date of file creation
  4210.   * +16 = +0x10: 4*byte: time of last access (read or write)
  4211.   * +20 = +0x14: 4*byte: date of last access
  4212.   * +24 = +0x18: 4*byte: time of last modification
  4213.   * +28 = +0x1C: 4*byte: date of last modification
  4214.   * +32 = +0x20: qword: file size in bytes (up to 16777216 Tb)
  4215.   * +40 = +0x28: name
  4216.     * for ASCII format: maximum length is 263 characters
  4217.       (263 bytes), byte after the name has value 0
  4218.     * for UNICODE format: maximum length is 259 characters
  4219.       (518 bytes), 2 bytes after the name have value 0
  4220. Time format:
  4221.   * +0: byte: seconds
  4222.   * +1: byte: minutes
  4223.   * +2: byte: hours
  4224.   * +3: byte: reserved (0)
  4225.   * for example, 23.59.59 is written as (in hex) 3B 3B 17 00
  4226. Date format:
  4227.   * +0: byte: day
  4228.   * +1: byte: month
  4229.   * +2: word: year
  4230.   * for example, 25.11.1979 is written as (in hex) 19 0B BB 07
  4231. Remarks:
  4232.   * If BDFE contains ASCII name, the length of BDFE is 304 bytes,
  4233.     if UNICODE name - 560 bytes. Value of length is aligned
  4234.     on 16-byte bound (to accelerate processing in CPU cache).
  4235.   * First character after a name is zero (ASCIIZ-string). The further
  4236.     data contain garbage.
  4237.   * If files in folder were ended before requested number was read,
  4238.     the function will read as many as it can, and after that return
  4239.     eax=6 (EOF).
  4240.   * Any folder on the disk, except for root, contains two special
  4241.     entries "." and "..", identifying accordingly the folder itself
  4242.     and the parent folder.
  4243.   * The function allows also to read virtual folders "/", "/rd",
  4244.     "/fd", "/hd[n]", thus attributes of subfolders are set to 0x10,
  4245.     and times and dates are zeroed. An alternative way to get the
  4246.     equipment information - subfunction 11 of function 18.
  4247.  
  4248. ======================================================================
  4249. ===================== Function 70, subfunction 2 =====================
  4250. ============ Create/rewrite file with long names support. ============
  4251. ======================================================================
  4252. Parameters:
  4253.   * eax = 70 - function number
  4254.   * ebx = pointer to the information structure
  4255. Format of the information structure:
  4256.   * +0: dword: 2 = subfunction number
  4257.   * +4: dword: 0 (reserved)
  4258.   * +8: dword: 0 (reserved)
  4259.   * +12 = +0xC: dword: number of bytes to read
  4260.   * +16 = +0x10: dword: pointer to data
  4261.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4262.     given in the general description
  4263.     or
  4264.   * +20 = +0x14: db 0
  4265.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4266. Returned value:
  4267.   * eax = 0 - success, otherwise file system error code
  4268.   * ebx = number of written bytes (possibly 0)
  4269. Remarks:
  4270.   * If a file with given name did not exist, it is created;
  4271.     if it existed, it is rewritten.
  4272.   * If there is not enough free space on disk, the function will
  4273.     write as many as can and then return error code 8.
  4274.   * The function is not supported for CD (returns error code 2).
  4275.  
  4276. ======================================================================
  4277. ===================== Function 70, subfunction 3 =====================
  4278. =========== Write to existing file with long names support. ==========
  4279. ======================================================================
  4280. Parameters:
  4281.   * eax = 70 - function number
  4282.   * ebx = pointer to the information structure
  4283. Format of the information structure:
  4284.   * +0: dword: 3 = subfunction number
  4285.   * +4: dword: file offset (in bytes)
  4286.   * +8: dword: high dword of offset (must be 0 for FAT)
  4287.   * +12 = +0xC: dword: number of bytes to write
  4288.   * +16 = +0x10: dword: pointer to data
  4289.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4290.     given in the general description
  4291.     or
  4292.   * +20 = +0x14: db 0
  4293.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4294. Returned value:
  4295.   * eax = 0 - success, otherwise file system error code
  4296.   * ebx = number of written bytes (possibly 0)
  4297. Remarks:
  4298.   * The file must already exist, otherwise function returns eax=5.
  4299.   * The only result of write 0 bytes is update in the file attributes
  4300.     date/time of modification and access to the current date/time.
  4301.   * If beginning and/or ending position is greater than file size
  4302.     (except for the previous case), the file is expanded to needed
  4303.     size with zero characters.
  4304.   * The function is not supported for CD (returns error code 2).
  4305.  
  4306. ======================================================================
  4307. ============ Function 70, subfunction 4 - set end of file. ===========
  4308. ======================================================================
  4309. Parameters:
  4310.   * eax = 70 - function number
  4311.   * ebx = pointer to the information structure
  4312. Format of the information structure:
  4313.   * +0: dword: 4 = subfunction number
  4314.   * +4: dword: low dword of new file size
  4315.   * +8: dword: high dword of new file size (must be 0 for FAT)
  4316.   * +12 = +0xC: dword: 0 (reserved)
  4317.   * +16 = +0x10: dword: 0 (reserved)
  4318.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4319.     given in the general description
  4320.     or
  4321.   * +20 = +0x14: db 0
  4322.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4323. Returned value:
  4324.   * eax = 0 - success, otherwise file system error code
  4325.   * ebx destroyed
  4326. Remarks:
  4327.   * If the new file size is less than old one, file is truncated.
  4328.     If the new size is greater than old one, file is expanded with
  4329.     characters with code 0. If the new size is equal to old one,
  4330.     the only result of call is set date/time of modification and
  4331.     access to the current date/time.
  4332.   * If there is not enough free space on disk for expansion, the
  4333.     function will expand to maximum possible size and then return
  4334.     error code 8.
  4335.   * The function is not supported for CD (returns error code 2).
  4336.  
  4337. ======================================================================
  4338. ==== Function 70, subfunction 5 - get information on file/folder. ====
  4339. ======================================================================
  4340. Parameters:
  4341.   * eax = 70 - function number
  4342.   * ebx = pointer to the information structure
  4343. Format of the information structure:
  4344.   * +0: dword: 5 = subfunction number
  4345.   * +4: dword: 0 (reserved)
  4346.   * +8: dword: 0 (reserved)
  4347.   * +12 = +0xC: dword: 0 (reserved)
  4348.   * +16 = +0x10: dword: pointer to buffer for data (40 bytes)
  4349.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4350.     given in the general description
  4351.     or
  4352.   * +20 = +0x14: db 0
  4353.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4354. Returned value:
  4355.   * eax = 0 - success, otherwise file system error code
  4356.   * ebx destroyed
  4357. Information on file is returned in the BDFE format (block of data
  4358. for folder entry), explained in the description of
  4359. subfunction 1, but without filename
  4360. (i.e. only first 40 = 0x28 bytes).
  4361. Remarks:
  4362.   * The function does not support virtual folders such as /, /rd and
  4363.     root folders like /rd/1.
  4364.  
  4365. ======================================================================
  4366. ===== Function 70, subfunction 6 - set attributes of file/folder. ====
  4367. ======================================================================
  4368. Parameters:
  4369.   * eax = 70 - function number
  4370.   * ebx = pointer to the information structure
  4371. Format of the information structure:
  4372.   * +0: dword: 6 = subfunction number
  4373.   * +4: dword: 0 (reserved)
  4374.   * +8: dword: 0 (reserved)
  4375.   * +12 = +0xC: dword: 0 (reserved)
  4376.   * +16 = +0x10: dword: pointer to buffer with attributes (32 bytes)
  4377.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4378.     given in the general description
  4379.     or
  4380.   * +20 = +0x14: db 0
  4381.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4382. Returned value:
  4383.   * eax = 0 - success, otherwise file system error code
  4384.   * ebx destroyed
  4385. File attributes are first 32 bytes in BDFE (block of data
  4386. for folder entry), explained in the description of subfunction 1
  4387. (that is, without name and size of file). Attribute
  4388. file/folder/volume label (bits 3,4 in dword +0) is not changed.
  4389. Byte +4 (name format) is ignored.
  4390. Remarks:
  4391.   * The function does not support virtual folders such as /, /rd and
  4392.     root folders like /rd/1.
  4393.   * The function is not supported for CD (returns error code 2).
  4394.  
  4395. ======================================================================
  4396. =========== Function 70, subfunction 7 - start application. ==========
  4397. ======================================================================
  4398. Parameters:
  4399.   * eax = 70 - function number
  4400.   * ebx = pointer to the information structure
  4401. Format of the information structure:
  4402.   * +0: dword: 7 = subfunction number
  4403.   * +4: dword: flags field:
  4404.     * áèò 0: start process as debugged
  4405.     * other bits are reserved and must be set to 0
  4406.   * +8: dword: 0 or pointer to ASCIIZ-string with parameters
  4407.   * +12 = +0xC: dword: 0 (reserved)
  4408.   * +16 = +0x10: dword: 0 (reserved)
  4409.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4410.     given in the general description
  4411.     or
  4412.   * +20 = +0x14: db 0
  4413.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4414. Returned value:
  4415.   * eax > 0 - program is loaded, eax contains PID
  4416.   * eax < 0 - an error has occured, -eax contains
  4417.     file system error code
  4418.   * ebx destroyed
  4419. Remarks:
  4420.   * Command line must be terminated by the character with the code 0
  4421.     (ASCIIZ-string); function takes into account either all characters
  4422.     up to terminating zero inclusively or first 256 character
  4423.     regarding what is less.
  4424.   * If the process is started as debugged, it is created in
  4425.     the suspended state; to run use subfunction 5 of function 69.
  4426.  
  4427. ======================================================================
  4428. ========== Function 70, subfunction 8 - delete file/folder. ==========
  4429. ======================================================================
  4430. Parameters:
  4431.   * eax = 70 - function number
  4432.   * ebx = pointer to the information structure
  4433. Format of the information structure:
  4434.   * +0: dword: 8 = subfunction number
  4435.   * +4: dword: 0 (reserved)
  4436.   * +8: dword: 0 (reserved)
  4437.   * +12 = +0xC: dword: 0 (reserved)
  4438.   * +16 = +0x10: dword: 0 (reserved)
  4439.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4440.     given in the general description
  4441.     or
  4442.   * +20 = +0x14: db 0
  4443.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4444. Returned value:
  4445.   * eax = 0 - success, otherwise file system error code
  4446.   * ebx destroyed
  4447. Remarks:
  4448.   * The function is not supported for CD (returns error code 2).
  4449.   * The function can delete only empty folders (attempt to delete
  4450.     nonempty folder results in error with code 10, "access denied").
  4451.  
  4452. ======================================================================
  4453. ============= Function 70, subfunction 9 - create folder. ============
  4454. ======================================================================
  4455. Parameters:
  4456.   * eax = 70 - function number
  4457.   * ebx = pointer to the information structure
  4458. Format of the information structure:
  4459.   * +0: dword: 9 = subfunction number
  4460.   * +4: dword: 0 (reserved)
  4461.   * +8: dword: 0 (reserved)
  4462.   * +12 = +0xC: dword: 0 (reserved)
  4463.   * +16 = +0x10: dword: 0 (reserved)
  4464.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  4465.     given in the general description
  4466.     or
  4467.   * +20 = +0x14: db 0
  4468.   * +21 = +0x15: dd pointer to ASCIIZ-string with folder name
  4469. Returned value:
  4470.   * eax = 0 - success, otherwise file system error code
  4471.   * ebx destroyed
  4472. Remarks:
  4473.   * The function is not supported for CD (returns error code 2).
  4474.   * The parent folder must already exist.
  4475.   * If target folder already exists, function returns success (eax=0).
  4476.  
  4477. ======================================================================
  4478. ========== Function 71, subfunction 1 - set window caption. ==========
  4479. ======================================================================
  4480. Parameters:
  4481.   * eax = 71 - function number
  4482.   * ebx = 1 - subfunction number
  4483.   * ecx = pointer to caption string
  4484. Returned value:
  4485.   * function does not return value
  4486. Remarks:
  4487.   * String must be in the ASCIIZ-format. Disregarding real string
  4488.     length, no more than 255 characters are drawn.
  4489.   * Pass NULL in ecx to remove caption.
  4490.  
  4491. ======================================================================
  4492. =============== Function 72 - send message to a window. ==============
  4493. ======================================================================
  4494.  
  4495. - Subfunction 1 - send message with parameter to the active window. --
  4496. Parameters:
  4497.   * eax = 72 - function number
  4498.   * ebx = 1 - subfunction number
  4499.   * ecx = event code: 2 or 3
  4500.   * edx = parameter: key code for ecx=2, button identifier for ecx=3
  4501. Returned value:
  4502.   * eax = 0 - success
  4503.   * eax = 1 - buffer is full
  4504.  
  4505. ======================================================================
  4506. =============== Function -1 - terminate thread/process ===============
  4507. ======================================================================
  4508. Parameters:
  4509.   * eax = -1 - function number
  4510. Returned value:
  4511.   * function does not return neither value nor control
  4512. Remarks:
  4513.   * If the process did not create threads obviously, it has only
  4514.     one thread, which termination results in process termination.
  4515.   * If the current thread is last in the process, its termination
  4516.     also results in process terminates.
  4517.   * This function terminates the current thread. Other thread can be
  4518.     killed by call to subfunction 2 of function 18.
  4519.  
  4520. ======================================================================
  4521. =========================== List of events ===========================
  4522. ======================================================================
  4523. Next event can be retrieved by the call of one from functions 10
  4524. (to wait for event), 11 (to check without waiting), 23
  4525. (to wait during the given time).
  4526. These functions return only those events, which enter into a mask set
  4527. by function 40. By default it is first three,
  4528. there is enough for most applications.
  4529. Codes of events:
  4530.   * 1 = redraw event (is reset by call to function 0)
  4531.   * 2 = key on keyboard is pressed (acts, only when the window is
  4532.     active) or hotkey is pressed; is reset, when all keys from
  4533.     the buffer are read out by function 2
  4534.   * 3 = button is pressed, defined earlier by function 8
  4535.     (or close button, created implicitly by function 0;
  4536.     minimize button is handled by the system and sends no message;
  4537.     acts, only when the window is active;
  4538.     is reset when all buttons from the buffer
  4539.     are read out by function 17)
  4540.   * 4 = reserved (in current implementation never comes even after
  4541.     unmasking by function 40)
  4542.   * 5 = the desktop background is redrawed (is reset automatically
  4543.     after redraw, so if in redraw time program does not wait and
  4544.     does not check events, it will not remark this event)
  4545.   * 6 = mouse event (something happened - button pressing or moving;
  4546.     is reset at reading)
  4547.   * 7 = IPC event (see function 60 -
  4548.     Inter Process Communication; is reset at reading)
  4549.   * 8 = network event (is reset at reading)
  4550.   * 9 = debug event (is reset at reading; see
  4551.     debug subsystem)
  4552.   * 16..31 = event with appropriate IRQ
  4553.     (16=IRQ0, 31=IRQ15) (is reset after reading all IRQ data)
  4554.  
  4555. ======================================================================
  4556. =================== Error codes of the file system ===================
  4557. ======================================================================
  4558.   * 0 = success
  4559.   * 1 = base and/or partition of a hard disk is not defined
  4560.     (by subfunctions 7, 8 of function 21)
  4561.   * 2 = function is not supported for the given file system
  4562.   * 3 = unknown file system
  4563.   * 4 = reserved, is never returned in the current implementation
  4564.   * 5 = file not found
  4565.   * 6 = end of file, EOF
  4566.   * 7 = pointer lies outside of application memory
  4567.   * 8 = disk is full
  4568.   * 9 = FAT table is destroyed
  4569.   * 10 = access denied
  4570.   * 11 = device error
  4571. Application start functions can return also following errors:
  4572.   * 30 = 0x1E = not enough memory
  4573.   * 31 = 0x1F = file is not executable
  4574.   * 32 = 0x20 = too many processes
  4575.