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  1. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  2. ;;                                                              ;;
  3. ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
  4. ;; Distributed under terms of the GNU General Public License    ;;
  5. ;;                                                              ;;
  6. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  7.  
  8. SYSTEM FUNCTIONS of OS Kolibri 0.7.7.0
  9.  
  10. Number of the function is located in the register eax.
  11. The call of the system function is executed by "int 0x40" command.
  12. All registers except explicitly declared in the returned value,
  13.     including eflags, are preserved.
  14.  
  15.  
  16. ======================================================================
  17. ============== Function 0 - define and draw the window. ==============
  18. ======================================================================
  19. Defines an application window. Draws a frame of the window, header and
  20. working area. For skinned windows defines standard close and minimize
  21. buttons.
  22. Parameters:
  23.   * eax = 0 - function number
  24.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  25.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  26.   * edx = 0xXYRRGGBB, where:
  27.     * Y = style of the window:
  28.       * Y=0 - type I - fixed-size window
  29.       * Y=1 - only define window area, draw nothing
  30.       * Y=2 - type II - variable-size window
  31.       * Y=3 - skinned window
  32.       * Y=4 - skinned fixed-size window
  33.       * other possible values (from 5 up to 15) are reserved,
  34.         function call with such Y is ignored
  35.     * RR, GG, BB = accordingly red, green, blue components of a color
  36.       of the working area of the window (are ignored for style Y=1)
  37.     * X = DCBA (bits)
  38.       * A = 1 - window has caption; for styles Y=3,4 caption string
  39.                   must be passed in edi, for other styles use
  40.                   subfunction 1 of function 71
  41.       * B = 1 - coordinates of all graphics primitives are relative to
  42.                   window client area
  43.       * C = 1 - don't fill working area on window draw
  44.       * D = 0 - normal filling of the working area, 1 - gradient
  45.     The following parameters are intended for windows
  46.     of a type I and II, and ignored for styles Y=1,3:
  47.   * esi = 0xXYRRGGBB - color of the header
  48.     * RR, GG, BB define color
  49.     * Y=0 - usual window, Y=1 - unmovable window (works for all window styles)
  50.     * X defines a gradient of header: X=0 - no gradient,
  51.       X=8 - usual gradient,
  52.       for windows of a type II X=4 - negative gradient
  53.     * other values of X and Y are reserved
  54.   * edi = 0x00RRGGBB - color of the frame
  55. Returned value:
  56.   * function does not return value
  57. Remarks:
  58.   * Position and sizes of the window are installed by the first
  59.     call of this function and are ignored at subsequent; to change
  60.     position and/or sizes of already created window use function 67.
  61.   * For windows with styles Y=3,4 and caption (A=1) caption string
  62.     is set by the first call of this function and is ignored
  63.     at subsequent (strictly speaking, is ignored after a call to
  64.     subfunction 2 of function 12 - end redraw); to change caption of
  65.     already created window use subfunction 1 of function 71.
  66.   * If the window has appropriate styles, position and/or sizes can be
  67.     changed by user. Current position and sizes can be obtained
  68.     by function 9.
  69.   * The window must fit on the screen. If the transferred
  70.     coordinates and sizes do not satisfy to this condition,
  71.     appropriate coordinate (or, probably, both) is considered as zero,
  72.     and if it does not help too, the appropriate size
  73.     (or, probably, both) is installed in a size of the screen.
  74.  
  75.     Further let us designate xpos,ypos,xsize,ysize - values passed
  76.     in ebx,ecx. The coordinates are resulted concerning
  77.     the left upper corner of the window, which, thus, is set as (0,0),
  78.     coordinates of the right lower corner essence (xsize,ysize).
  79.   * The sizes of the window are understood in sence of coordinates
  80.     of the right lower corner. This concerns all other functions too.
  81.     It means, that the real sizes are on 1 pixel more.
  82.   * The window of type I looks as follows:
  83.     * draw external frame of color indicated in edi, 1 pixel in width
  84.     * draw header - rectangle with the left upper corner (1,1) and
  85.       right lower (xsize-1,min(20,ysize-1)) color indicated in esi
  86.       (taking a gradient into account)
  87.     * if ysize>21, fill the working area of the window -
  88.       rectangle with the left upper corner (1,21) and right lower
  89.       (xsize-1,ysize-1) (sizes (xsize-1)*(ysize-21)) with color
  90.       indicated in edx (taking a gradient into account)
  91.     * if A=1 and caption has been already set by subfunction 1
  92.       of function 71, it is drawn in the corresponding place of header
  93.   * The window of style Y=1 looks as follows:
  94.     * completely defined by the application
  95.   * The window of type II looks as follows:
  96.     * draw external frame of width 1 pixel with the "shaded" color
  97.       edi (all components of the color decrease twice)
  98.     * draw intermediate frame of width 3 pixels with color edi
  99.     * draw internal frame of width 1 pixel with the "shaded" color edi
  100.     * draw header - rectangle with the left upper corner (4,4)
  101.       and right lower (xsize-4,min(20,ysize)) color, indicated in esi
  102.       (taking a gradient into account)
  103.     * if ysize>=26, fill the working area of the window -
  104.       rectangle with the left upper corner (5,20) and right lower
  105.       (xsize-5,ysize-5) with color indicated in edx
  106.       (taking a gradient into account)
  107.     * if A=1 and caption has been already set by subfunction 1
  108.       of function 71, it is drawn in the corresponding place of header
  109.   * The skinned window looks as follows:
  110.     * draw external frame of width 1 pixel
  111.       with color 'outer' from the skin
  112.     * draw intermediate frame of width 3 pixel
  113.       with color 'frame' from the skin
  114.     * draw internal frame of width 1 pixel
  115.       with color 'inner' from the skin
  116.     * draw header (on bitmaps from the skin) in a rectangle
  117.       (0,0) - (xsize,_skinh-1)
  118.     * if ysize>=26, fill the working area of the window -
  119.       rectangle with the left upper corner (5,_skinh) and right lower
  120.       (xsize-5,ysize-5) with color indicated in edx
  121.       (taking a gradient into account)
  122.     * define two standard buttons: close and minimize
  123.       (see function 8)
  124.     * if A=1 and edi contains (nonzero) pointer to caption string,
  125.       it is drawn in place in header defined in the skin
  126.     * value _skinh is accessible as the result of call
  127.       subfunction 4 of function 48
  128.  
  129. ---------------------- Constants for registers: ----------------------
  130.   eax - SF_CREATE_WINDOW (0)
  131. ======================================================================
  132. ================ Function 1 - put pixel in the window. ===============
  133. ======================================================================
  134. Parameters:
  135.   * eax = 1 - function number
  136.   * ebx = x-coordinate (relative to the window)
  137.   * ecx = y-coordinate (relative to the window)
  138.   * edx = 0x00RRGGBB - color of a pixel
  139.     edx = 0x01xxxxxx - invert color of a pixel
  140.           (low 24 bits are ignored)
  141. Returned value:
  142.   * function does not return value
  143.  
  144. ---------------------- Constants for registers: ----------------------
  145.   eax - SF_PUT_PIXEL (1)
  146. ======================================================================
  147. ============ Function 2 - get the code of the pressed key. ===========
  148. ======================================================================
  149. Takes away the code of the pressed key from the buffer.
  150. Parameters:
  151.   * eax = 2 - function number
  152. Returned value:
  153.   * if the buffer is empty, function returns eax=1
  154.   * if the buffer is not empty, function returns al=0,
  155.     ah=code of the pressed key,
  156.     bits 16-23 = contain scancode for pressed key in ASCII mode,
  157.                  in the scancodes mode this bits cleared.
  158.     bits 23-31 = zero
  159.   * if there is "hotkey", function returns al=2,
  160.     ah=scancode of the pressed key (0 for control keys),
  161.     high word of eax contains a status of control keys at the moment
  162.     of pressing a hotkey
  163. Remarks:
  164.   * There is a common system buffer of the pressed keys
  165.     by a size of 120 bytes, organized as queue.
  166.   * There is one more common system buffer on 120 "hotkeys".
  167.   * If the application with the inactive window calls this function,
  168.     the buffer of the pressed keys is considered to be empty.
  169.   * By default this function returns ASCII-codes; to switch
  170.     to the scancodes mode (and back) use function 66.
  171.     However, hotkeys are always notificated as scancodes.
  172.   * To find out, what keys correspond to what codes, start
  173.     the application keyascii and scancode.
  174.   * Scancodes come directly from keyboard and are fixed;
  175.     ASCII-codes turn out with usage of the conversion tables,
  176.     which can be set by subfunction 2 of function 21
  177.     and get by subfunction 2 of function 26.
  178.   * As a consequence, ASCII-codes take into account current
  179.     keyboard layout (rus/en) as opposed to scancodes.
  180.   * This function notifies only about those hotkeys, which were
  181.     defined by this thread by subfunction 4 of function 66.
  182.  
  183. ---------------------- Constants for registers: ----------------------
  184.   eax - SF_GET_KEY (2)
  185. ======================================================================
  186. ==================== Function 3 - get system time. ===================
  187. ======================================================================
  188. Parameters:
  189.   * eax = 3 - function number
  190. Returned value:
  191.   * eax = 0x00SSMMHH, where HH:MM:SS = Hours:Minutes:Seconds
  192.   * each item is BCD-number, for example,
  193.     for time 23:59:59 function returns 0x00595923
  194. Remarks:
  195.   * See also subfunction 9 of function 26 - get time from
  196.     the moment of start of the system; it is more convenient, because
  197.     returns simply DWORD-value of the time counter.
  198.   * System time can be set by function 22.
  199.  
  200. ---------------------- Constants for registers: ----------------------
  201.   eax - SF_GET_SYS_TIME (3)
  202. ======================================================================
  203. =================== Function 4 - draw text string. ===================
  204. ======================================================================
  205. Parameters:
  206.   * eax = 4 - function number
  207.   * ebx = X*65536+Y, coordinates in the window or buffer
  208.   * ecx = 0xXXRRGGBB, where
  209.     * RR, GG, BB specify text color
  210.     * XX = ABFFCSSS (bits):
  211.       * A=1 - output zero terminated string
  212.       * B=1 - fill background (color = edi)
  213.       * FF specifies the font and encoding:
  214.         0 = 6x9  cp866
  215.         1 = 8x16 cp866
  216.         2 = 8x16 UTF-16LE
  217.         3 = 8x16 UTF-8
  218.       * C=0 - draw to the window,
  219.         C=1 - draw to the user buffer (edi)
  220.       * SSS = (size multiplier)-1, so 0 = x1, 7 = x8
  221.   * edx = pointer to the beginning of the string
  222.   * esi = for A=0 length of the string, for A=1 is ignored
  223.   * edi = for B=1 color to fill background,
  224.           for C=1 pointer to user buffer
  225.  
  226. Returned value:
  227.   * function does not return value
  228. Remarks:
  229.   * You can not use B=1 and C=1 at the same time, since both use edi.
  230.   * When SSS=0, font may be smoothed, depending on system setting.
  231.   * User buffer structure:
  232. Xsize       dd
  233. Ysize       dd
  234. picture     rb  Xsize*Ysize*4  ; 32 bpp
  235.  
  236. ---------------------- Constants for registers: ----------------------
  237.   eax - SF_DRAW_TEXT (4)
  238. ======================================================================
  239. ========================= Function 5 - delay. ========================
  240. ======================================================================
  241. Delays execution of the program on the given time.
  242. Parameters:
  243.   * eax = 5 - function number
  244.   * ebx = time in the 1/100 of second
  245. Returned value:
  246.   * function does not return value
  247. Remarks:
  248.   * Passing ebx=0 does not transfer control to the next process
  249.     and does not make any operations at all. If it is really required
  250.     to transfer control to the next process (to complete a current
  251.     time slice), use subfunction 1 of function 68.
  252.  
  253. ---------------------- Constants for registers: ----------------------
  254.   eax - SF_SLEEP (5)
  255. ======================================================================
  256. =============== Function 7 - draw image in the window. ===============
  257. ======================================================================
  258. Paramters:
  259.   * eax = 7 - function number
  260.   * ebx = pointer to the image in the format BBGGRRBBGGRR...
  261.   * ecx = [size on axis x]*65536 + [size on axis y]
  262.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  263. Returned value:
  264.   * function does not return value
  265. Remarks:
  266.   * Coordinates of the image are coordinates of the upper left corner
  267.     of the image relative to the window.
  268.   * Size of the image in bytes is 3*xsize*ysize.
  269.  
  270. ---------------------- Constants for registers: ----------------------
  271.   eax - SF_PUT_IMAGE (7)
  272. ======================================================================
  273. =============== Function 8 - define/delete the button. ===============
  274. ======================================================================
  275. Parameters for button definition:
  276.   * eax = 8 - function number
  277.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  278.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  279.   * edx = 0xXYnnnnnn, where:
  280.     * nnnnnn = identifier of the button
  281.     * high (31st) bit of edx is cleared
  282.     * if 30th bit of edx is set - do not draw the button
  283.     * if 29th bit of edx is set - do not draw a frame
  284.       at pressing the button
  285.   * esi = 0x00RRGGBB - color of the button
  286. Parameters for button deleting:
  287.   * eax = 8 - function number
  288.   * edx = 0x80nnnnnn, where nnnnnn - identifier of the button
  289. Returned value:
  290.   * function does not return value
  291. Remarks:
  292.   * Sizes of the button must be more than 0 and less than 0x8000.
  293.   * For skinned windows definition of the window
  294.     (call of 0th function) creates two standard buttons -
  295.     for close of the window with identifier 1 and
  296.     for minimize of the window with identifier 0xffff.
  297.   * The creation of two buttons with same identifiers is admitted.
  298.   * The button with the identifier 0xffff at pressing is interpreted
  299.     by the system as the button of minimization, the system handles
  300.     such pressing independently, not accessing to the application.
  301.     In rest it is usual button.
  302.   * Total number of buttons for all applications is limited to 4095.
  303.  
  304. ---------------------- Constants for registers: ----------------------
  305.   eax - SF_DEFINE_BUTTON (8)
  306. ======================================================================
  307. ============ Function 9 - information on execution thread. ===========
  308. ======================================================================
  309. Parameters:
  310.   * eax = 9 - function number
  311.   * ebx = pointer to 1-Kb buffer
  312.   * ecx = number of the slot of the thread
  313.     ecx = -1 - get information on the current thread
  314. Returned value:
  315.   * eax = maximum number of the slot of a thread
  316.   * buffer pointed to by ebx contains the following information:
  317.     * +0: dword: usage of the processor (how many time units
  318.       per second leaves on execution of this thread)
  319.     * +4: word: position of the window of thread in the window stack
  320.     * +6: word: (has no relation to the specified thread)
  321.       number of the thread slot, which window has in the window stack
  322.       position ecx
  323.     * +8: word: reserved
  324.     * +10 = +0xA: 11 bytes: name of the process
  325.       (name of the started file - executable file without extension)
  326.     * +21 = +0x15: byte: reserved, this byte is not changed
  327.     * +22 = +0x16: dword: address of the process in memory
  328.     * +26 = +0x1A: dword: size of used memory - 1
  329.     * +30 = +0x1E: dword: identifier (PID/TID)
  330.     * +34 = +0x22: dword: coordinate of the thread window on axis x
  331.     * +38 = +0x26: dword: coordinate of the thread window on axis y
  332.     * +42 = +0x2A: dword: size of the thread window on axis x
  333.     * +46 = +0x2E: dword: size of the thread window on axis y
  334.     * +50 = +0x32: word: status of the thread slot:
  335.       * 0 = thread is running
  336.       * 1 = thread is suspended
  337.       * 2 = thread is suspended while waiting for event
  338.       * 3 = thread is terminating as a result of call to function -1
  339.         or under duress as a result of call to subfunction 2
  340.         of function 18 or termination of the system
  341.       * 4 = thread is terminating as a result of exception
  342.       * 5 = thread waits for event
  343.       * 9 = requested slot is free, all other information on the slot
  344.         is not meaningful
  345.     * +52 = +0x34: word: reserved, this word is not changed
  346.     * +54 = +0x36: dword: coordinate of the client area on axis x
  347.     * +58 = +0x3A: dword: coordinate of the client area on axis y
  348.     * +62 = +0x3E: dword: width of the client area
  349.     * +66 = +0x42: dword: height of the client area
  350.     * +70 = +0x46: byte: state of the window - bitfield
  351.       * bit 0 (mask 1): window is maximized
  352.       * bit 1 (mask 2): window is minimized to panel
  353.       * bit 2 (mask 4): window is rolled up
  354.     * +71 = +0x47: dword: event mask
  355.     * +75 = +0x4B: byte: keyboard mode(ASCII = 0; SCAN = 1)
  356. Remarks:
  357.   * Slots are numbered starting from 1.
  358.   * Returned value is not a total number of threads, because there
  359.     can be free slots.
  360.   * When process is starting, system automatically creates
  361.     execution thread.
  362.   * Function gives information on the thread. Each process has
  363.     at least one thread. One process can create many threads,
  364.     in this case each thread has its own slot and the fields
  365.     +10, +22, +26 in these slots coincide.
  366.     Applications have no common way to define whether two threads
  367.     belong to one process.
  368.   * The active window - window on top of the window stack -
  369.     receives the messages on a keyboard input. For such window
  370.     the position in the window stack coincides with returned value.
  371.   * Slot 1 corresponds to special system thread, for which:
  372.     * the window is in the bottom of the window stack, the fields
  373.       +4 and +6 contain value 1
  374.     * name of the process - "OS/IDLE" (supplemented by spaces)
  375.     * address of the process in memory is 0, size of used memory is
  376.       16 Mb (0x1000000)
  377.     * PID=1
  378.     * coordinates and sizes of the window and the client area are by
  379.       convention set to 0
  380.     * status of the slot is always 0 (running)
  381.     * the execution time adds of time leaving on operations itself
  382.       and idle time in waiting for interrupt (which can be got by call
  383.       to subfunction 4 of function 18).
  384.   * Beginning from slot 2, the normal applications are placed.
  385.   * The normal applications are placed in memory at the address
  386.     0 (kernel constant 'std_application_base_address').
  387.     There is no intersection, as each process has its own page table.
  388.   * At creation of the thread it is assigned the slot
  389.     in the system table and identifier (Process/Thread IDentifier =
  390.     PID/TID), which do not vary with time for given thread.
  391.     After completion of the thread its slot can be anew used
  392.     for another thread. The thread identifier can not be assigned
  393.     to other thread even after completion of this thread.
  394.     Identifiers, assigned to new threads, grow monotonously.
  395.   * If the thread has not yet defined the window by call to
  396.     function 0, the position and the sizes
  397.     of its window are considered to be zero.
  398.   * Coordinates of the client area are relative to the window.
  399.   * At the moment only the part of the buffer by a size
  400.     76 = 0x4C bytes is used. Nevertheless it is recommended to use
  401.     1-Kb buffer for the future compatibility, in the future
  402.     some fields can be added.
  403.  
  404. ---------------------- Constants for registers: ----------------------
  405.   eax - SF_THREAD_INFO (9)
  406. ======================================================================
  407. ==================== Function 10 - wait for event. ===================
  408. ======================================================================
  409. If the message queue is empty, waits for appearance of the message
  410. in queue. In this state thread does not consume CPU time.
  411. Then reads out the message from queue.
  412.  
  413. Parameters:
  414.   * eax = 10 - function number
  415. Returned value:
  416.   * eax = event (see the list of events)
  417. Remarks:
  418.   * Those events are taken into account only which enter into
  419.     a mask set by function 40. By default it is
  420.     redraw, key and button events.
  421.   * To check, whether there is a message in queue, use function 11.
  422.     To wait for no more than given time, use function 23.
  423.  
  424. ---------------------- Constants for registers: ----------------------
  425.   eax - SF_WAIT_EVENT (10)
  426. ======================================================================
  427. =============== Function 11 - check for event, no wait. ==============
  428. ======================================================================
  429. If the message queue contains event, function reads out
  430. and return it. If the queue is empty, function returns 0.
  431. Parameters:
  432.   * eax = 11 - function number
  433. Returned value:
  434.   * eax = 0 - message queue is empty
  435.   * else eax = event (see the list of events)
  436. Remarks:
  437.   * Those events are taken into account only, which enter into
  438.     a mask set by function 40. By default it is
  439.     redraw, key and button events.
  440.   * To wait for event, use function 10.
  441.     To wait for no more than given time, use function 23.
  442.  
  443. ---------------------- Constants for registers: ----------------------
  444.   eax - SF_CHECK_EVENT (11)
  445. ======================================================================
  446. =============== Function 12 - begin/end window redraw. ===============
  447. ======================================================================
  448.  
  449. ---------------- Subfunction 1 - begin window redraw. ----------------
  450. Parameters:
  451.   * eax = 12 - function number
  452.   * ebx = 1 - subfunction number
  453. Returned value:
  454.   * function does not return value
  455.  
  456. ----------------- Subfunction 2 - end window redraw. -----------------
  457. Parameters:
  458.   * eax = 12 - function number
  459.   * ebx = 2 - subfunction number
  460. Returned value:
  461.   * function does not return value
  462. Remarks:
  463.   * Subfunction 1 deletes all buttons defined with
  464.     function 8, they must be defined again.
  465.  
  466. ---------------------- Constants for registers: ----------------------
  467.   eax - SF_REDRAW (12)
  468.   ebx - SSF_BEGIN_DRAW (1), SSF_END_DRAW (2)
  469. ======================================================================
  470. ============ Function 13 - draw a rectangle in the window. ===========
  471. ======================================================================
  472. Parameters:
  473.   * eax = 13 - function number
  474.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  475.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  476.   * edx = color 0xRRGGBB or 0x80RRGGBB for gradient fill
  477. Returned value:
  478.   * function does not return value
  479. Remarks:
  480.   * Coordinates are understood as coordinates of the left upper corner
  481.     of a rectangle relative to the window.
  482.  
  483. ---------------------- Constants for registers: ----------------------
  484.   eax - SF_DRAW_RECT (13)
  485. ======================================================================
  486. =================== Function 14 - get screen size. ===================
  487. ======================================================================
  488. Parameters:
  489.   * eax = 14 - function number
  490. Returned value:
  491.   * eax = [xsize]*65536 + [ysize], where
  492.   * xsize = x-coordinate of the right lower corner of the screen =
  493.             horizontal size - 1
  494.   * ysize = y-coordinate of the right lower corner of the screen =
  495.             vertical size - 1
  496. Remarks:
  497.   * See also subfunction 5 of function 48 - get sizes of
  498.     working area of the screen.
  499.  
  500. ---------------------- Constants for registers: ----------------------
  501.   eax - SF_GET_SCREEN_SIZE (14)
  502. ======================================================================
  503. == Function 15, subfunction 1 - set a size of the background image. ==
  504. ======================================================================
  505. Parameters:
  506.   * eax = 15 - function number
  507.   * ebx = 1 - subfunction number
  508.   * ecx = width of the image
  509.   * edx = height of the image
  510. Returned value:
  511.   * function does not return value
  512. Remarks:
  513.   * Before calling subfunctions 2 and 5 you should call this function
  514.     to set image size!
  515.   * For update of the screen (after completion of a series of commands
  516.     working with a background) call subfunction 3.
  517.   * There is a pair function for get size of the background image -
  518.     subfunction 1 of function 39.
  519.  
  520. ---------------------- Constants for registers: ----------------------
  521.   eax - SF_BACKGROUND_SET (15)
  522.   ebx - SSF_SIZE_BG (1)
  523. ======================================================================
  524. === Function 15, subfunction 2 - put pixel on the background image. ==
  525. ======================================================================
  526. Parameters:
  527.   * eax = 15 - function number
  528.   * ebx = 2 - subfunction number
  529.   * ecx = offset
  530.   * edx = color of a pixel 0xRRGGBB
  531. Returned value:
  532.   * function does not return value
  533. Remarks:
  534.   * Offset for a pixel with coordinates (x,y) is calculated as
  535.     (x+y*xsize)*3.
  536.   * If the given offset exceeds size set by subfunction 1,
  537.     the call is ignored.
  538.   * For update of the screen (after completion of a series of commands
  539.     working with a background) call subfunction 3.
  540.   * There is a pair function for get pixel on the background image -
  541.     subfunction 2 of function 39.
  542.  
  543. ---------------------- Constants for registers: ----------------------
  544.   eax - SF_BACKGROUND_SET (15)
  545.   ebx - SSF_PIXEL_BG (2)
  546. ======================================================================
  547. =========== Function 15, subfunction 3 - redraw background. ==========
  548. ======================================================================
  549. Parameters:
  550.   * eax = 15 - function number
  551.   * ebx = 3 - subfunction number
  552. Returned value:
  553.   * function does not return value
  554.  
  555. ---------------------- Constants for registers: ----------------------
  556.   eax - SF_BACKGROUND_SET (15)
  557.   ebx - SSF_REDRAW_BG (3)
  558. ======================================================================
  559. == Function 15, subfunction 4 - set drawing mode for the background. =
  560. ======================================================================
  561. Parameters:
  562.   * eax = 15 - function number
  563.   * ebx = 4 - subfunction number
  564.   * ecx = drawing mode:
  565.     * 1 = tile
  566.     * 2 = stretch
  567. Returned value:
  568.   * function does not return value
  569. Remarks:
  570.   * For update of the screen (after completion of a series of commands
  571.     working with a background) call subfunction 3.
  572.   * There is a pair function for get drawing mode of the background -
  573.     subfunction 4 of function 39.
  574.  
  575. ---------------------- Constants for registers: ----------------------
  576.   eax - SF_BACKGROUND_SET (15)
  577.   ebx - SSF_MODE_BG (4)
  578. ======================================================================
  579. ===================== Function 15, subfunction 5 =====================
  580. ============ Put block of pixels on the background image. ============
  581. ======================================================================
  582. Parameters:
  583.   * eax = 15 - function number
  584.   * ebx = 5 - subfunction number
  585.   * ecx = pointer to the data in the format BBGGRRBBGGRR...
  586.   * edx = offset in data of the background image
  587.   * esi = size of data in bytes = 3 * number of pixels
  588. Returned value:
  589.   * function does not return value
  590. Remarks:
  591.   * Offset and size are not checked for correctness.
  592.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  593.   * Pixels of the background image are written sequentially
  594.     from left to right, from up to down.
  595.   * Offset of pixel with coordinates (x,y) is (x+y*xsize)*3.
  596.   * For update of the screen (after completion of a series of commands
  597.     working with a background) call subfunction 3.
  598.  
  599. ---------------------- Constants for registers: ----------------------
  600.   eax - SF_BACKGROUND_SET (15)
  601.   ebx - SSF_IMAGE_BG (5)
  602. ======================================================================
  603. ===================== Function 15, subfunction 6 =====================
  604. ======== Map background data to the address space of process. ========
  605. ======================================================================
  606. Parameters:
  607.   * eax = 15 - function number
  608.   * ebx = 6 - subfunction number
  609. Returned value:
  610.   * eax = pointer to background data, 0 if error
  611. Remarks:
  612.   * Mapped data are available for read and write.
  613.   * Size of background data is 3*xsize*ysize. The system blocks
  614.     changes of background sizes while process works with mapped data.
  615.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  616.   * Pixels of the background image are written sequentially
  617.     from left to right, from up to down.
  618.  
  619. ---------------------- Constants for registers: ----------------------
  620.   eax - SF_BACKGROUND_SET (15)
  621.   ebx - SSF_MAP_BG (6)
  622. ======================================================================
  623. ===== Function 15, subfunction 7 - close mapped background data. =====
  624. ======================================================================
  625. Parameters:
  626.   * eax = 15 - function number
  627.   * ebx = 7 - subfunction number
  628.   * ecx = pointer to mapped data
  629. Returned value:
  630.   * eax = 1 - success, 0 - error
  631.  
  632. ---------------------- Constants for registers: ----------------------
  633.   eax - SF_BACKGROUND_SET (15)
  634.   ebx - SSF_UNMAP_BG (7)
  635. ======================================================================
  636. ===================== Function 15, subfunction 8 =====================
  637. ============= Get coordinates of last draw the background ============
  638. ======================================================================
  639. Parameters:
  640.   * eax = 15 - function number
  641.   * ebx = 8 - subfunction number
  642. Returned value:
  643.   * eax = [left]*65536 + [right]
  644.   * ebx = [top]*65536 + [bottom]
  645. Remarks:
  646.   * (left,top) are coordinates of the left upper corner,
  647.     (right,bottom) are coordinates of the right lower one.
  648.   * For receiving more reliable information, call the function
  649.     immediately after the event:
  650.              5 = kernel finished redrawing of the desktop background
  651.  
  652. ---------------------- Constants for registers: ----------------------
  653.   eax - SF_BACKGROUND_SET (15)
  654.   ebx - SSF_LAST_DRAW (8)
  655. ======================================================================
  656. ===================== Function 15, subfunction 9 =====================
  657. ============= Redraws a rectangular part of the background ===========
  658. ======================================================================
  659. Parameters:
  660.   * eax = 15 - function number
  661.   * ebx = 9 - subfunction number
  662.   * ecx = [left]*65536 + [right]
  663.   * edx = [top]*65536 + [bottom]
  664. Returned value:
  665.   * function does not return value
  666. Remarks:
  667.   * (left,top) are coordinates of the left upper corner,
  668.     (right,bottom) are coordinates of the right lower one.
  669.   * If parameters are set incorrectly then background is not redrawn.
  670.  
  671. ---------------------- Constants for registers: ----------------------
  672.   eax - SF_BACKGROUND_SET (15)
  673.   ebx - SSF_REDRAW_RECT (9)
  674. ======================================================================
  675. =============== Function 16 - save ramdisk on a floppy. ==============
  676. ======================================================================
  677. Parameters:
  678.   * eax = 16 - function number
  679.   * ebx = 1 or ebx = 2 - on which floppy save
  680. Returned value:
  681.   * eax = 0 - success
  682.   * eax = 1 - error
  683.  
  684. ---------------------- Constants for registers: ----------------------
  685.   eax - SF_RD_TO_FLOPPY (16)
  686. ======================================================================
  687. ======= Function 17 - get the identifier of the pressed button. ======
  688. ======================================================================
  689. Takes away the code of the pressed button from the buffer.
  690. Parameters:
  691.   * eax = 17 - function number
  692. Returned value:
  693.   * if the buffer is empty, function returns eax=1
  694.   * if the buffer is not empty:
  695.     * high 24 bits of eax contain button identifier (in particular,
  696.       ah contains low byte of the identifier; if all buttons have
  697.       the identifier less than 256, ah is enough to distinguish)
  698.     * al = 0 - the button was pressed with left mouse button
  699.     * al = bit corresponding to used mouse button otherwise
  700. Remarks:
  701.   * "Buffer" keeps only one button, at pressing the new button the
  702.     information about old is lost.
  703.   * The call of this function by an application with inactive window
  704.     will return answer "buffer is empty".
  705.   * Returned value for al corresponds to the state of mouse buttons
  706.     as in subfunction 2 of function 37 at the beginning
  707.     of button press, excluding lower bit, which is cleared.
  708.  
  709. ---------------------- Constants for registers: ----------------------
  710.   eax - SF_GET_BUTTON (17)
  711. ======================================================================
  712. ===================== Function 18, subfunction 1 =====================
  713. ============= Make deactive the window of the given thread. ==========
  714. ======================================================================
  715. Parameters:
  716.   * eax = 18 - function number
  717.   * ebx = 1 - subfunction number
  718.   * ecx = number of the thread slot
  719. Returned value:
  720.   * function does not return value
  721.  
  722. ---------------------- Constants for registers: ----------------------
  723.   eax - SF_SYSTEM (18)
  724.   ebx - SSF_UNFOCUS_WINDOW (1)
  725. ======================================================================
  726. = Function 18, subfunction 2 - terminate process/thread by the slot. =
  727. ======================================================================
  728. Parameters:
  729.   * eax = 18 - function number
  730.   * ebx = 2 - subfunction number
  731.   * ecx = number of the slot of process/thread
  732. Returned value:
  733.   * function does not return value
  734. Remarks:
  735.   * It is impossible to terminate system thread OS/IDLE (with
  736.     number of the slot 1),
  737.     it is possible to terminate any normal process/thread.
  738.   * See also subfunction 18 - terminate
  739.     process/thread by the identifier.
  740.  
  741. ---------------------- Constants for registers: ----------------------
  742.   eax - SF_SYSTEM (18)
  743.   ebx - SSF_TERMINATE_THREAD (2)
  744. ======================================================================
  745. ===================== Function 18, subfunction 3 =====================
  746. ============= Make active the window of the given thread. ============
  747. ======================================================================
  748. Parameters:
  749.   * eax = 18 - function number
  750.   * ebx = 3 - subfunction number
  751.   * ecx = number of the thread slot
  752. Returned value:
  753.   * function does not return value
  754. Remarks:
  755.   * If correct, but nonexistent slot is given,
  756.     some window is made active.
  757.   * To find out, which window is active, use subfunction 7.
  758.  
  759. ---------------------- Constants for registers: ----------------------
  760.   eax - SF_SYSTEM (18)
  761.   ebx - SSF_FOCUS_WINDOW (3)
  762. ======================================================================
  763. ===================== Function 18, subfunction 4 =====================
  764. =========== Get counter of idle time units per one second. ===========
  765. ======================================================================
  766. Idle time units are units, in which the processor stands idle
  767. in waiting for interrupt (in the command 'hlt').
  768.  
  769. Parameters:
  770.   * eax = 18 - function number
  771.   * ebx = 4 - subfunction number
  772. Returned value:
  773.   * eax = value of the counter of idle time units per one second
  774.  
  775. ---------------------- Constants for registers: ----------------------
  776.   eax - SF_SYSTEM (18)
  777.   ebx - SSF_GET_IDLE_COUNT (4)
  778. ======================================================================
  779. ========== Function 18, subfunction 5 - get CPU clock rate. ==========
  780. ======================================================================
  781. Parameters:
  782.   * eax = 18 - function number
  783.   * ebx = 5 - subfunction number
  784. Returned value:
  785.   * eax = clock rate (modulo 2^32 clock ticks = 4GHz)
  786.  
  787. ---------------------- Constants for registers: ----------------------
  788.   eax - SF_SYSTEM (18)
  789.   ebx - SSF_GET_CPU_REQUENCY (5)
  790. ======================================================================
  791.  Function 18, subfunction 6 - save ramdisk to the file on hard drive.
  792. ======================================================================
  793. Parameters:
  794.   * eax = 18 - function number
  795.   * ebx = 6 - subfunction number
  796.   * ecx = pointer to the full path to file
  797.     (for example, "/hd0/1/kolibri/kolibri.img")
  798. Returned value:
  799.   * eax = 0 - success
  800.   * else eax = error code of the file system
  801. Remarks:
  802.   * All folders in the given path must exist, otherwise function
  803.     returns value 5, "file not found".
  804.  
  805. ---------------------- Constants for registers: ----------------------
  806.   eax - SF_SYSTEM (18)
  807.   ebx - SSF_RD_TO_HDD (6)
  808. ======================================================================
  809. =========== Function 18, subfunction 7 - get active window. ==========
  810. ======================================================================
  811. Parameters:
  812.   * eax = 18 - function number
  813.   * ebx = 7 - subfunction number
  814. Returned value:
  815.   * eax = number of the active window
  816.     (number of the slot of the thread with active window)
  817. Remarks:
  818.   * Active window is at the top of the window stack and receives
  819.     messages on all keyboard input.
  820.   * To make a window active, use subfunction 3.
  821.  
  822. ---------------------- Constants for registers: ----------------------
  823.   eax - SF_SYSTEM (18)
  824.   ebx - SSF_GET_ACTIVE_WINDOW (7)
  825. ======================================================================
  826. == Function 18, subfunction 8 - disable/enable the internal speaker. =
  827. ======================================================================
  828. If speaker sound is disabled, all calls to subfunction 55 of
  829. function 55 are ignored. If speaker sound is enabled,
  830. they are routed on builtin speaker.
  831.  
  832. ------------------- Subsubfunction 1 - get status. -------------------
  833. Parameters:
  834.   * eax = 18 - function number
  835.   * ebx = 8 - subfunction number
  836.   * ecx = 1 - number of the subsubfunction
  837. Returned value:
  838.   * eax = 0 - speaker sound is enabled; 1 - disabled
  839.  
  840. ----------------- Subsubfunction 2 - toggle status. ------------------
  841. Toggles states of disable/enable.
  842. Parameters:
  843.   * eax = 18 - function number
  844.   * ebx = 8 - subfunction number
  845.   * ecx = 2 - number of the subsubfunction
  846. Returned value:
  847.   * function does not return value
  848.  
  849. ---------------------- Constants for registers: ----------------------
  850.   eax - SF_SYSTEM (18)
  851.   ebx - SSF_SPEAKER (8)
  852.   ecx - SSSF_GET_STATE (1), SSSF_TOGGLE (2)
  853. ======================================================================
  854. == Function 18, subfunction 9 - system shutdown with the parameter. ==
  855. ======================================================================
  856. Parameters:
  857.   * eax = 18 - function number
  858.   * ebx = 9 - subfunction number
  859.   * ecx = parameter:
  860.     * 2 = turn off computer
  861.     * 3 = reboot computer
  862.     * 4 = restart the kernel from the file 'kernel.mnt' on ramdisk
  863. Returned value:
  864.   * at incorrect ecx the registers do not change (i.e. eax=18)
  865.   * by correct call function always returns eax=0
  866.     as the tag of success
  867. Remarks:
  868.   * Do not rely on returned value by incorrect call, it can be
  869.     changed in future versions of the kernel.
  870.  
  871. ---------------------- Constants for registers: ----------------------
  872.   eax - SF_SYSTEM (18)
  873.   ebx - SSF_SHUTDOWN (9)
  874. ======================================================================
  875. ======= Function 18, subfunction 10 - minimize topmost window. =======
  876. ======================================================================
  877. Minimizes the topmost (active) window.
  878. Parameters:
  879.   * eax = 18 - function number
  880.   * ebx = 10 - subfunction number
  881. Returned value:
  882.   * function does not return value
  883. Remarks:
  884.   * The minimized window from the point of view of function 9
  885.     keeps position and sizes.
  886.   * Restoring of an application window occurs at its activation by
  887.     subfunction 3.
  888.   * Usually there is no necessity to minimize/restore a window
  889.     explicitly: minimization of a window is carried out by the system
  890.     at pressing the minimization button (for skinned windows
  891.     it is defined automatically by function 0,
  892.     for other windows it can be defined manually by function 8),
  893.     restore of a window is done by the application '@taskbar'.
  894.  
  895. ---------------------- Constants for registers: ----------------------
  896.   eax - SF_SYSTEM (18)
  897.   ebx - SSF_MINIMIZE_WINDOW (10)
  898. ======================================================================
  899.  Function 18, subfunction 11 - get information on the disk subsystem.
  900. ======================================================================
  901. Parameters:
  902.   * eax = 18 - function number
  903.   * ebx = 11 - subfunction number
  904.   * ecx = type of the table:
  905.     * 1 = short version, 16 bytes
  906.   * edx = pointer to the buffer (in the application) for the table
  907. Returned value:
  908.   * function does not return value
  909. Format of the table: short version:
  910.   * +0: byte: information about FDD's (drives for floppies),
  911.     AAAABBBB, where AAAA gives type of the first drive, BBBB -
  912.     of the second regarding to the following list:
  913.     * 0 = there is no drive
  914.     * 1 = 360Kb, 5.25''
  915.     * 2 = 1.2Mb, 5.25''
  916.     * 3 = 720Kb, 3.5''
  917.     * 4 = 1.44Mb, 3.5''
  918.     * 5 = 2.88Mb, 3.5'' (such drives are not used anymore)
  919.     For example, for the standard configuration from one 1.44-drive
  920.     here will be 40h, and for the case 1.2Mb on A: and 1.44Mb on B:
  921.     the value is 24h.
  922.    
  923.   First IDE controller:
  924.   * +1: byte: information about hard disks and CD-drives, AABBCCDD,
  925.     where AA corresponds to the controller IDE0, ..., DD - IDE3:
  926.     * 0 = device not found
  927.     * 1 = hard drive
  928.     * 2 = CD-drive
  929.     For example, in the case HD on IDE0 and CD on IDE2
  930.     this field contains 48h.
  931.   * +2: 4 db: number of the retrieved partitions on hard disks
  932.     at accordingly IDE0,...,IDE3.
  933.    
  934.   Second IDE controller:
  935.   * +6: byte: information about hard disks and CD-drives, AABBCCDD,
  936.     where AA corresponds to the controller IDE4, ..., DD - IDE7:
  937.     * 0 = device not found
  938.     * 1 = hard drive
  939.     * 2 = CD-drive
  940.     For example, in the case HD on IDE4 and CD on IDE6
  941.     this field contains 48h.
  942.   * +7: 4 db: number of the retrieved partitions on hard disks
  943.     at accordingly IDE4,...,IDE7.
  944.  
  945.   Third IDE controller:
  946.   * +11: byte: information about hard disks and CD-drives, AABBCCDD,
  947.     where AA corresponds to the controller IDE8, ..., DD - IDE11:
  948.     * 0 = device not found
  949.     * 1 = hard drive
  950.     * 2 = CD-drive
  951.     For example, in the case HD on IDE8 and CD on IDE10
  952.     this field contains 48h.
  953.   * +12: 4 db: number of the retrieved partitions on hard disks
  954.     at accordingly IDE8,...,IDE11.  
  955.    
  956.     If the hard disk on IDEx is absent, appropriate byte is zero,
  957.     otherwise it shows number of the recognized partitions, which
  958.     can be not presented (if the drive is not formatted or if
  959.     the file system is not supported). Current version of the kernel
  960.     supports only FAT12/16/32, NTFS, ext2/3/4 and XFS for hard disks.
  961.  
  962. Remarks:
  963.   * The table can be used for obtaining the information about
  964.     available devices.
  965.  
  966. ---------------------- Constants for registers: ----------------------
  967.   eax - SF_SYSTEM (18)
  968.   ebx - SSF_INFO_DISC_SYS (11)
  969. ======================================================================
  970. ========== Function 18, subfunction 13 - get kernel version. =========
  971. ======================================================================
  972. Parameters:
  973.   * eax = 18 - function number
  974.   * ebx = 13 - subfunction number
  975.   * ecx = pointer to the buffer (not less than 16 bytes), where
  976.     the information will be placed
  977. Returned value:
  978.   * function does not return value
  979. Structure of the buffer:
  980. db a,b,c,d for version a.b.c.d
  981. db 0: reserved
  982. dd REV - kernel SVN revision number
  983. For Kolibri 0.7.7.0+ kernel:
  984. db 0,7,7,0
  985. db 0
  986. dd 1675
  987.  
  988. ---------------------- Constants for registers: ----------------------
  989.   eax - SF_SYSTEM (18)
  990.   ebx - SSF_KERNEL_VERSION (13)
  991. ======================================================================
  992. ======= Function 18, subfunction 14 - wait for screen retrace. =======
  993. ======================================================================
  994. Waits for the beginning of retrace of the scanning ray of the screen
  995. monitor.
  996. Parameters:
  997.   * eax = 18 - function number
  998.   * ebx = 14 - subfunction number
  999. Returned value:
  1000.   * eax = 0 as the tag of success
  1001. Remarks:
  1002.   * Function is intended only for active high-efficiency graphics
  1003.     applications; is used for smooth output of a graphics.
  1004.  
  1005. ---------------------- Constants for registers: ----------------------
  1006.   eax - SF_SYSTEM (18)
  1007.   ebx - SSF_WAIT_RETRACE (14)
  1008. ======================================================================
  1009. == Function 18, subfunction 15 - center mouse cursor on the screen. ==
  1010. ======================================================================
  1011. Parameters:
  1012.   * eax = 18 - function number
  1013.   * ebx = 15 - subfunction number
  1014. Returned value:
  1015.   * eax = 0 as the tag of success
  1016.  
  1017. ---------------------- Constants for registers: ----------------------
  1018.   eax - SF_SYSTEM (18)
  1019.   ebx - SSF_CURSOR_CENTER (15)
  1020. ======================================================================
  1021. ========= Function 18, subfunction 16 - get size of free RAM. ========
  1022. ======================================================================
  1023. Parameters:
  1024.   * eax = 18 - function number
  1025.   * ebx = 16 - subfunction number
  1026. Returned value:
  1027.   * eax = size of free memory in kilobytes
  1028.  
  1029. ---------------------- Constants for registers: ----------------------
  1030.   eax - SF_SYSTEM (18)
  1031.   ebx - SSF_GET_FREE_RAM (16)
  1032. ======================================================================
  1033. ======== Function 18, subfunction 17 - get full amount of RAM. =======
  1034. ======================================================================
  1035. Parameters:
  1036.   * eax = 18 - function number
  1037.   * ebx = 17 - subfunction number
  1038. Returned value:
  1039.   * eax = total size of existing memory in kilobytes
  1040.  
  1041. ---------------------- Constants for registers: ----------------------
  1042.   eax - SF_SYSTEM (18)
  1043.   ebx - SSF_GET_TOTAL_RAM (17)
  1044. ======================================================================
  1045. ===================== Function 18, subfunction 18 ====================
  1046. ============= Terminate process/thread by the identifier. ============
  1047. ======================================================================
  1048. Parameters:
  1049.   * eax = 18 - function number
  1050.   * ebx = 18 - subfunction number
  1051.   * ecx = identifer of process/thread (PID/TID)
  1052. Returned value:
  1053.   * eax = 0 - success
  1054.   * eax = -1 - error (process is not found or is system)
  1055. Remarks:
  1056.   * It is impossible to terminate system thread OS/IDLE (identifier
  1057.     1), it is possible to terminate any normal process/thread.
  1058.   * See also subfunction 2 - terminate
  1059.     process/thread by given slot.
  1060.  
  1061. ---------------------- Constants for registers: ----------------------
  1062.   eax - SF_SYSTEM (18)
  1063.   ebx - SSF_TERMINATE_THREAD_ID (18)
  1064. ======================================================================
  1065. ======== Function 18, subfunction 19 - get/set mouse features. =======
  1066. ======================================================================
  1067.  
  1068. ---------------- Subsubfunction 0 - get mouse speed. -----------------
  1069. Parameters:
  1070.   * eax = 18 - function number
  1071.   * ebx = 19 - subfunction number
  1072.   * ecx = 0 - subsubfunction number
  1073. Returned value:
  1074.   * eax = current mouse speed
  1075.  
  1076. ---------------- Subsubfunction 1 - set mouse speed. -----------------
  1077. Parameters:
  1078.   * eax = 18 - function number
  1079.   * ebx = 19 - subfunction number
  1080.   * ecx = 1 - subsubfunction number
  1081.   * edx = new value for speed
  1082. Returned value:
  1083.   * function does not return value
  1084.  
  1085. Remark: recommended speed = 1, 0 = lock the cursor.
  1086.  
  1087. ------------- Subsubfunction 2 - get mouse acceleration. -------------
  1088. Parameters:
  1089.   * eax = 18 - function number
  1090.   * ebx = 19 - subfunction number
  1091.   * ecx = 2 - subsubfunction number
  1092. Returned value:
  1093.   * eax = 0 - off, 1 - slight, 2 - medium, 3 - intense
  1094.  
  1095. ------------- Subsubfunction 3 - set mouse acceleration. -------------
  1096. Parameters:
  1097.   * eax = 18 - function number
  1098.   * ebx = 19 - subfunction number
  1099.   * ecx = 3 - subsubfunction number
  1100.   * edx = 0 - off, 1 - slight, 2 - medium, 3 - intense
  1101. Returned value:
  1102.   * function does not return value
  1103.  
  1104. ----------- Subsubfunction 4 - set mouse pointer position. -----------
  1105. Parameters:
  1106.   * eax = 18 - function number
  1107.   * ebx = 19 - subfunction number
  1108.   * ecx = 4 - subsubfunction number
  1109.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1110. Returned value:
  1111.   * function does not return value
  1112.  
  1113. -------- Subsubfunction 5 - simulate state of mouse buttons. ---------
  1114. Parameters:
  1115.   * eax = 18 - function number
  1116.   * ebx = 19 - subfunction number
  1117.   * ecx = 5 - subsubfunction number
  1118.   * edx = information about emulated state of mouse buttons:
  1119.     (same as return value in subfunction 2 of function 37)
  1120.     * bit 0 is set = left button is pressed
  1121.     * bit 1 is set = right button is pressed
  1122.     * bit 2 is set = middle button is pressed
  1123.     * bit 3 is set = 4th button is pressed
  1124.     * bit 4 is set = 5th button is pressed
  1125. Returned value:
  1126.   * function does not return value
  1127.  
  1128. -------------- Subsubfunction 6 - get doubleclick delay. -------------
  1129. Parameters:
  1130.   * eax = 18 - function number
  1131.   * ebx = 19 - subfunction number
  1132.   * ecx = 6 - subsubfunction number
  1133. Returned value:
  1134.   * eax = current doubleclick delay (100 = 1 second)
  1135.  
  1136. -------------- Subsubfunction 7 - set doubleclick delay. -------------
  1137. Parameters:
  1138.   * eax = 18 - function number
  1139.   * ebx = 19 - subfunction number
  1140.   * ecx = 7 - subsubfunction number
  1141.   * dl  = new value for doubleclick delay (100 = 1 second)
  1142. Returned value:
  1143.   * function does not return value
  1144.  
  1145. Remark: mouse settings can be modified in the application mouse_cfg.
  1146.  
  1147. ---------------------- Constants for registers: ----------------------
  1148.   eax - SF_SYSTEM (18)
  1149.   ebx - SSF_MOUSE_SETTINGS (19)
  1150.   ecx - SSSF_GET_SPEED (0), SSSF_SET_SPEED (1), SSSF_GET_SPEEDUP (2),
  1151.     SSSF_SET_SPEEDUP (3), SSSF_SET_POS (4), SSSF_SET_BUTTON (5),
  1152.     SSSF_GET_DOUBLE_CLICK_DELAY (6), SSSF_SET_DOUBLE_CLICK_DELAY (7)
  1153. ======================================================================
  1154. ======== Function 18, subfunction 20 - get information on RAM. =======
  1155. ======================================================================
  1156. Parameters:
  1157.   * eax = 18 - function number
  1158.   * ebx = 20 - subfunction number
  1159.   * ecx = pointer to the buffer for information (36 bytes)
  1160. Returned value:
  1161.   * eax = total size of existing RAM in pages
  1162.     or -1 if error has occured
  1163.   * buffer pointed to by ecx contains the following information:
  1164.     * +0:  dword: total size of existing RAM in pages
  1165.     * +4:  dword: size of free RAM in pages
  1166.     * +8:  dword: number of page faults (exceptions #PF)
  1167.                  in applications
  1168.     * +12: dword: size of kernel heap in bytes
  1169.     * +16: dword: free in kernel heap in bytes
  1170.     * +20: dword: total number of memory blocks in kernel heap
  1171.     * +24: dword: number of free memory blocks in kernel heap
  1172.     * +28: dword: size of maximum free block in kernel heap
  1173.                  (reserved)
  1174.     * +32: dword: size of maximum allocated block in kernel heap
  1175.                  (reserved)
  1176.  
  1177. ---------------------- Constants for registers: ----------------------
  1178.   eax - SF_SYSTEM (18)
  1179.   ebx - SSF_GET_RAM_INFO (20)
  1180. ======================================================================
  1181. ===================== Function 18, subfunction 21 ====================
  1182. ======== Get slot number of process/thread by the identifier. ========
  1183. ======================================================================
  1184. Parameters:
  1185.   * eax = 18 - function number
  1186.   * ebx = 21 - subfunction number
  1187.   * ecx = identifer of process/thread (PID/TID)
  1188. Returned value:
  1189.   * eax = 0 - error (invalid identifier)
  1190.   * otherwise eax = slot number
  1191.  
  1192. ---------------------- Constants for registers: ----------------------
  1193.   eax - SF_SYSTEM (18)
  1194.   ebx - SSF_GET_THREAD_SLOT (21)
  1195. ======================================================================
  1196. ===================== Function 18, subfunction 22 ====================
  1197. ============== Operations with window of another thread. =============
  1198. ======================================================================
  1199. Parameters:
  1200.   * eax = 18 - function number
  1201.   * ebx = 22 - subfunction number
  1202.   * ecx = operation type:
  1203.     * 0 = minimize window of the thread with given slot number
  1204.     * 1 = minimize window of the thread with given identifier
  1205.     * 2 = restore window of the thread with given slot number
  1206.     * 3 = restore window of the thread with given identifier
  1207.   * edx = parameter (slot number or PID/TID)
  1208. Returned value:
  1209.   * eax = 0 - success
  1210.   * eax = -1 - error (invalid identifier)
  1211. Remarks:
  1212.   * The thread can minimize its window with subfunction 10.
  1213.   * One can restore and activate window simultaneously with
  1214.     subfunction 3 (which requires slot number).
  1215.  
  1216. ---------------------- Constants for registers: ----------------------
  1217.   eax - SF_SYSTEM (18)
  1218.   ebx - SSF_FOREIGN_WINDOW (22)
  1219.   ecx - SSSF_MINIMIZE (0), SSSF_MINIMIZE_ID (1), SSSF_RESTORE (2),
  1220.     SSSF_RESTORE_ID (3)
  1221. ======================================================================
  1222. ======== Function 18, subfunction 23 - minimize all windows. ==========
  1223. ======================================================================
  1224. Parameters:
  1225.   * eax = 18 - function number
  1226.   * ebx = 23 - subfunction number
  1227. Returned value:
  1228.   * eax = 0 - all windows have been minimized before a function call
  1229.   * eax = N - number of windows minimized from function
  1230. Remarks:
  1231.   * Window of special thread (name begin to symbol @) is not minimize.
  1232.  
  1233. ---------------------- Constants for registers: ----------------------
  1234.   eax - SF_SYSTEM (18)
  1235.   ebx - SSF_MINIMIZE_ALL (23)
  1236. ======================================================================
  1237. ======= Function 18, subfunction 24 - set limits of screen. ==========
  1238. ======================================================================
  1239. Parameters:
  1240.   * eax = 18 - function number
  1241.   * ebx = 24 - subfunction number
  1242.   * ecx = new X size
  1243.   * edx = new Y size
  1244. Returned value:
  1245.   * function does not return value
  1246. Remarks:
  1247.   * The function does not change the physical size of the video mode.
  1248.     It is designed for non-standard displays which display the image
  1249.     partially.
  1250.   * The sizes specified in the function should not exceed the sizes
  1251.     of the current video mode, otherwise the function will not change
  1252.     anything.
  1253.  
  1254. ---------------------- Constants for registers: ----------------------
  1255.   eax - SF_SYSTEM (18)
  1256.   ebx - SSF_SET_SCREEN_LIMITS (24)
  1257. ======================================================================
  1258. ===================== Function 18, subfunction 25 ====================
  1259. ===== Control position of the window relative to other windows. ======
  1260. ======================================================================
  1261.  
  1262. ------------- Subsubfunction 1 - get position  -----------------------
  1263. Parameters:
  1264.   * eax = 18 - function number
  1265.   * ebx = 25 - subfunction number
  1266.   * ecx = 1 - subsubfunction number
  1267.   * edx = -1(for current window) or PID application
  1268. Returned value:
  1269.   * eax = one of the constants window position
  1270.  
  1271. ------------- Subsubfunction 2 - set position  -----------------------
  1272. Parameters:
  1273.   * eax = 18 - function number
  1274.   * ebx = 25 - subfunction number
  1275.   * ecx = 2 - subsubfunction number
  1276.   * edx = -1(for current window) or PID application
  1277.   * esi = new window position (one of the constants below)
  1278. Returned value:
  1279.   * eax = 0 - error
  1280.   * eax = 1 - success
  1281.  
  1282. Constant position of the window relative to other windows:
  1283.  ZPOS_DESKTOP     = -2 - on the background
  1284.  ZPOS_ALWAYS_BACK = -1 - behind all the windows
  1285.  ZPOS_NORMAL      = 0  - normal
  1286.  ZPOS_ALWAYS_TOP  = 1  - on top of all windows
  1287.  
  1288. ---------------------- Constants for registers: ----------------------
  1289.   eax - SF_SYSTEM (18)
  1290.   ebx - SSF_WINDOW_BEHAVIOR (25)
  1291.   ecx - SSSF_GET_WB (1), SSSF_SET_WB (2)
  1292. ======================================================================
  1293. ==================== Function 20 - MIDI interface. ===================
  1294. ======================================================================
  1295.  
  1296. ----------------------- Subfunction 1 - reset ------------------------
  1297. Parameters:
  1298.   * eax = 20 - function number
  1299.   * ebx = 1 - subfunction number
  1300.  
  1301. -------------------- Subfunction 2 - output byte ---------------------
  1302. Parameters:
  1303.   * eax = 20 - function number
  1304.   * ebx = 2 - subfunction number
  1305.   * cl = byte for output
  1306. Returned value (is the same for both subfunctions):
  1307.   * eax = 0 - success
  1308.   * eax = 1 - base port is not defined
  1309. Remarks:
  1310.   * Previously the base port must be defined by
  1311.     subfunction 1 of function 21.
  1312.  
  1313. ---------------------- Constants for registers: ----------------------
  1314.   eax - SF_MIDI (20)
  1315.   ebx - SSF_RESET (1), SSF_OUTPUT (2)
  1316. ======================================================================
  1317. ======== Function 21, subfunction 1 - set MPU MIDI base port. ========
  1318. ======================================================================
  1319. Parameters:
  1320.   * eax = 21 - function number
  1321.   * ebx = 1 - subfunction number
  1322.   * ecx = number of base port
  1323. Returned value
  1324.   * eax = 0 - success
  1325.   * eax = -1 - erratic number of a port
  1326. Remarks:
  1327.   * Number of a port must satisfy to conditions 0x100<=ecx<=0xFFFF.
  1328.   * The installation of base is necessary for function 20.
  1329.   * To get base port use subfunction 1 of function 26.
  1330.  
  1331. ---------------------- Constants for registers: ----------------------
  1332.   eax - SF_SYSTEM_SET (21)
  1333.   ebx - SSF_MPU_MIDI_BASE (1)
  1334. ======================================================================
  1335. ========== Function 21, subfunction 2 - set keyboard layout. =========
  1336. ======================================================================
  1337. Keyboard layout is used to convert keyboard scancodes to ASCII-codes,
  1338. which will be read by function 2.
  1339. Parameters:
  1340.   * eax = 21 - function number
  1341.   * ebx = 2 - subfunction number
  1342.   * ecx = which layout to set:
  1343.     * 1 = normal layout
  1344.     * 2 = layout at pressed Shift
  1345.     * 3 = layout at pressed Alt
  1346.   * edx = pointer to layout - table of length 128 bytes
  1347. Or:
  1348.   * ecx = 9
  1349.   * dx = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1350. Returned value:
  1351.   * eax = 0 - success
  1352.   * eax = 1 - incorrect parameter
  1353. Remarks:
  1354.   * If Alt is pressed, the layout with Alt is used;
  1355.     if Alt is not pressed, but Shift is pressed,
  1356.     the layout with Shift is used;
  1357.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1358.     layout is used and then from the code is subtracted 0x60;
  1359.     if no control key is pressed, the normal layout is used.
  1360.   * To get layout and country identifier use
  1361.     subfunction 2 of function 26.
  1362.   * Country identifier is global system variable, which is not used
  1363.     by the kernel itself; however the application '@taskbar' displays
  1364.     the corresponding icon.
  1365.   * The application @taskbar switches layouts on user request.
  1366.  
  1367. ---------------------- Constants for registers: ----------------------
  1368.   eax - SF_SYSTEM_SET (21)
  1369.   ebx - SSF_KEYBOARD_LAYOUT (2)
  1370. ======================================================================
  1371. ========== Function 21, subfunction 5 - set system language. =========
  1372. ======================================================================
  1373. Parameters:
  1374.   * eax = 21 - function number
  1375.   * ebx = 5 - subfunction number
  1376.   * ecx = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1377. Returned value:
  1378.   * eax = 0
  1379. Remarks:
  1380.   * System language is global system variable and is not used
  1381.     by the kernel itself, however application @taskbar draws the
  1382.     appropriate icon.
  1383.   * Function does not check for correctness, as the kernel does not
  1384.     use this variable.
  1385.   * To get system language use subfunction 5 of function 26.
  1386.  
  1387. ---------------------- Constants for registers: ----------------------
  1388.   eax - SF_SYSTEM_SET (21)
  1389.   ebx - SSF_SYS_LANG (5)
  1390. ======================================================================
  1391.  Function 21, subfunction 11 - enable/disable low-level access to HD.
  1392. ======================================================================
  1393. Parameters:
  1394.   * eax = 21 - function number
  1395.   * ebx = 11 - subfunction number
  1396.   * ecx = 0/1 - disable/enable
  1397. Returned value:
  1398.   * eax = 0
  1399. Remarks:
  1400.   * Is used in LBA-read (subfunction 8 of function 58).
  1401.   * The current implementation uses only low bit of ecx.
  1402.   * To get current status use subfunction 11 of function 26.
  1403.  
  1404. ---------------------- Constants for registers: ----------------------
  1405.   eax - SF_SYSTEM_SET (21)
  1406.   ebx - SSF_ACCESS_HD_LBA (11)
  1407. ======================================================================
  1408.  Function 21, subfunction 12 - enable/disable low-level access to PCI.
  1409. ======================================================================
  1410. Parameters:
  1411.   * eax = 21 - function number
  1412.   * ebx = 12 - subfunction number
  1413.   * ecx = 0/1 - disable/enable
  1414. Returned value:
  1415.   * eax = 0
  1416. Remarks:
  1417.   * Is used in operations with PCI bus (function 62).
  1418.   * The current implementation uses only low bit of ecx.
  1419.   * To get current status use subfunction 12 of function 26.
  1420.  
  1421. ---------------------- Constants for registers: ----------------------
  1422.   eax - SF_SYSTEM_SET (21)
  1423.   ebx - SSF_ACCESS_PCI (12)
  1424. ======================================================================
  1425. ================= Function 22 - set system date/time. ================
  1426. ======================================================================
  1427. Parameters:
  1428.   * eax = 22 - function number
  1429.   * ebx = 0 - set time
  1430.     * ecx = 0x00SSMMHH - time in the binary-decimal code (BCD):
  1431.     * HH=hour 00..23
  1432.     * MM=minute 00..59
  1433.     * SS=second 00..59
  1434.   * ebx = 1 - set date
  1435.     * ecx = 0x00DDMMYY - date in the binary-decimal code (BCD):
  1436.     * DD=day 01..31
  1437.     * MM=month 01..12
  1438.     * YY=year 00..99
  1439.   * ebx = 2 - set day of week
  1440.     * ecx = 1 for Sunday, ..., 7 for Saturday
  1441.   * ebx = 3 - set alarm clock
  1442.     * ecx = 0x00SSMMHH
  1443. Returned value:
  1444.   * eax = 0 - success
  1445.   * eax = 1 - incorrect parameter
  1446.   * eax = 2 - CMOS-battery was unloaded
  1447. Remarks:
  1448.   * Value of installation of day of week seems to be doubtful,
  1449.     as it a little where is used
  1450.     (day of week can be calculated by date).
  1451.   * Alarm clock can be set on operation in the given time every day.
  1452.     But there is no existing system function to disable it.
  1453.   * Operation of alarm clock consists in generation IRQ8.
  1454.   * Generally CMOS supports for alarm clock set of value 0xFF
  1455.     as one of parameters and it means that the appropriate parameter
  1456.     is ignored. But current implementation does not allow this
  1457.     (will return 1).
  1458.   * Alarm clock is a global system resource; the set of
  1459.     an alarm clock cancels automatically the previous set.
  1460.     However, at moment no program uses it.
  1461.  
  1462. ---------------------- Constants for registers: ----------------------
  1463.   eax - SF_SET_TIME_DATE (22)
  1464. ======================================================================
  1465. ============= Function 23 - wait for event with timeout. =============
  1466. ======================================================================
  1467. If the message queue is empty, waits for new message in the queue,
  1468. but no more than given time. Then reads out a message from the queue.
  1469.  
  1470. Parameters:
  1471.   * eax = 23 - function number
  1472.   * ebx = timeout (in 1/100 of second)
  1473. Returned value:
  1474.   * eax = 0 - the message queue is empty
  1475.   * otherwise eax = event (see the list of events)
  1476. Remarks:
  1477.   * Only those events are taken into account, which enter into
  1478.     the mask set by function 40. By default it is
  1479.     redraw, key and button events.
  1480.   * To check for presence of a message in the queue use function 11.
  1481.     To wait without timeout use function 10.
  1482.   * Transmission ebx=0 results in immediate returning eax=0.
  1483.   * Current implementation returns immediately with eax=0,
  1484.     if the addition of ebx with the current value of time counter
  1485.     makes 32-bit overflow.
  1486.  
  1487. ---------------------- Constants for registers: ----------------------
  1488.   eax - SF_WAIT_EVENT_TIMEOUT (23)
  1489. ======================================================================
  1490. ======= Function 24, subfunction 4 - eject tray of disk drive. =======
  1491. ======================================================================
  1492. Parameters:
  1493.   * eax = 24 - function number
  1494.   * ebx = 4 - subfunction number
  1495.   * ecx = position of CD/DVD-drive
  1496.     from 0=Primary Master to 3=Secondary Slave for first IDE contr.
  1497.     from 4=Primary Master to 7=Secondary Slave for second IDE contr.
  1498.     from 8=Primary Master to 11=Secondary Slave for third IDE contr.
  1499. Returned value:
  1500.   * function does not return value
  1501. Remarks:
  1502.   * The function is supported only for ATAPI devices (CD and DVD).
  1503.   * When the tray is being ejected,
  1504.     manual control of tray is unlocked.
  1505.   * When the tray is being ejected, the code clears the cache for
  1506.     corresponding device.
  1507.   * An example of usage of the function is the application CD_tray.
  1508.  
  1509. ---------------------- Constants for registers: ----------------------
  1510.   eax - SF_CD (24)
  1511.   ebx - SSF_EJECT_TRAY (4), SSF_INSERT_TRAY (5)
  1512. ======================================================================
  1513. ======== Function 24, subfunction 5 - load tray of disk drive. =======
  1514. ======================================================================
  1515. Parameters:
  1516.   * eax = 24 - function number
  1517.   * ebx = 5 - subfunction number
  1518.   * ecx = position of CD/DVD-drive
  1519.     from 0=Primary Master to 3=Secondary Slave for first IDE contr.
  1520.     from 4=Primary Master to 7=Secondary Slave for second IDE contr.
  1521.     from 8=Primary Master to 11=Secondary Slave for third IDE contr.
  1522. Returned value:
  1523.   * function does not return value
  1524. Remarks:
  1525.   * The function is supported only for ATAPI devices (CD and DVD).
  1526.   * An example of usage of the function is the application CD_tray.
  1527.  
  1528. ---------------------- Constants for registers: ----------------------
  1529.   eax - SF_CD (24)
  1530.   ebx - SSF_EJECT_TRAY (4), SSF_INSERT_TRAY (5)
  1531. ======================================================================
  1532. ======= Function 25 - put image area on the background layer. ========
  1533. ======================================================================
  1534. Paramters:
  1535.   * eax = 25 - function number
  1536.   * ebx = pointer to the previously allocated memory area,
  1537.         where placed the source images in a format BBGGRRTTBBGGRRTT...
  1538.   * ecx = [size on axis x]*65536 + [size on axis y]
  1539.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1540. Returned value:
  1541.   * function does not return value
  1542. Remarks:
  1543.   * Coordinates of the image are coordinates of the upper left corner
  1544.     of the image relative to the screen.
  1545.   * Size of the image in bytes is 4*xsize*ysize
  1546.   * TT - byte pointer of transparency, at current version:
  1547.          1 to FF - opaque, 0 - transparent.
  1548.   * The function places the image directly to LFB. It is not for
  1549.     background image f.15. Options f.15 to f.25 does not make sense.
  1550.  
  1551. ---------------------- Constants for registers: ----------------------
  1552.   eax - SF_SCREEN_PUT_IMAGE (25)
  1553. ======================================================================
  1554. ======== Function 26, subfunction 1 - get MPU MIDI base port. ========
  1555. ======================================================================
  1556. Parameters:
  1557.   * eax = 26 - function number
  1558.   * ebx = 1 - subfunction number
  1559. Returned value:
  1560.   * eax = port number
  1561. Parameters:
  1562.   * To set base port use subfunction 1 of function 21.
  1563.  
  1564. ---------------------- Constants for registers: ----------------------
  1565.   eax - SF_SYSTEM_GET (26)
  1566.   ebx - SSF_MPU_MIDI_BASE (1)
  1567. ======================================================================
  1568. ========== Function 26, subfunction 2 - get keyboard layout. =========
  1569. ======================================================================
  1570. The keyboard layout is used to convert keyboard scancodes to
  1571. ASCII-codes for function 2.
  1572. Parameters:
  1573.   * eax = 26 - function number
  1574.   * ebx = 2 - subfunction number
  1575.   * ecx = what layout to get:
  1576.     * 1 = normal layout
  1577.     * 2 = layout with pressed Shift
  1578.     * 3 = layout with pressed Alt
  1579.   * edx = pointer to the 128-bytes buffer, where the layout will be
  1580.     copied
  1581. Returned value:
  1582.   * function does not return value
  1583. Or:
  1584.   * eax = 26 - function number
  1585.   * ebx = 2 - subfunction number
  1586.   * ecx = 9
  1587. Returned value:
  1588.   * eax = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1589. Remarks:
  1590.   * If Alt is pressed, the layout with Alt is used;
  1591.     if Alt is not pressed, but Shift is pressed,
  1592.     the layout with Shift is used;
  1593.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1594.     layout is used and then from the code is subtracted 0x60;
  1595.     if no control key is pressed, the normal layout is used.
  1596.   * To set layout and country identifier use
  1597.     subfunction 2 of function 21.
  1598.   * Country identifier is global system variable, which is not used
  1599.     by the kernel itself; however the application '@taskbar' displays
  1600.     the corresponding icon (using this function).
  1601.   * The application @taskbar switches layouts on user request.
  1602.  
  1603. ---------------------- Constants for registers: ----------------------
  1604.   eax - SF_SYSTEM_GET (26)
  1605.   ebx - SSF_KEYBOARD_LAYOUT (2)
  1606. ======================================================================
  1607. ========== Function 26, subfunction 5 - get system language. =========
  1608. ======================================================================
  1609. Parameters:
  1610.   * eax = 26 - function number
  1611.   * ebx = 5 - subfunction number
  1612. Returned value:
  1613.   * eax = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1614. Remarks:
  1615.   * System language is global system variable and is not used
  1616.     by the kernel itself, however application @taskbar draws the
  1617.     appropriate icon (using this function).
  1618.   * To set system language use subfunction 5 of function 21.
  1619.  
  1620. ---------------------- Constants for registers: ----------------------
  1621.   eax - SF_SYSTEM_GET (26)
  1622.   ebx - SSF_SYS_LANG (5)
  1623. ======================================================================
  1624. === Function 26, subfunction 9 - get the value of the time counter. ==
  1625. ======================================================================
  1626. Parameters:
  1627.   * eax = 26 - function number
  1628.   * ebx = 9 - subfunction number
  1629. Returned value:
  1630.   * eax = number of 1/100s of second, past from the system boot time
  1631. Remarks:
  1632.   * Counter takes modulo 2^32, that correspond to a little more
  1633.     than 497 days.
  1634.   * To get system time use function 3.  
  1635.  
  1636. ---------------------- Constants for registers: ----------------------
  1637.   eax - SF_SYSTEM_GET (26)
  1638.   ebx - SSF_TIME_COUNT (9)
  1639. ======================================================================
  1640. ===================== Function 26, subfunction 10 ====================
  1641. ========== Get the value of the high precision time counter. =========
  1642. ======================================================================
  1643. Parameters:
  1644.   * eax = 26 - function number
  1645.   * ebx = 10 - subfunction number
  1646. Returned value:
  1647.   * eax = number of nanoseconds since system boot time (lower DWORD)
  1648.   * edx = number of nanoseconds since system boot time (high DWORD)  
  1649. Remarks:
  1650.   * The counter is based on HPET, if HPET is not available, resolution
  1651.     will be reduced to 10 000 000 nanoseconds.
  1652.  
  1653. ---------------------- Constants for registers: ----------------------
  1654.   eax - SF_SYSTEM_GET (26)
  1655.   ebx - SSF_TIME_COUNT_PRO (10)
  1656. ======================================================================
  1657. ===================== Function 26, subfunction 11 ====================
  1658. ========== Find out whether low-level HD access is enabled. ==========
  1659. ======================================================================
  1660. Parameters:
  1661.   * eax = 26 - function number
  1662.   * ebx = 11 - subfunction number
  1663. Returned value:
  1664.   * eax = 0/1 - disabled/enabled
  1665. Remarks:
  1666.   * Is used in LBA read (subfunction 8 of function 58).
  1667.   * To set current state use subfunction 11 of function 21.
  1668.  
  1669. ---------------------- Constants for registers: ----------------------
  1670.   eax - SF_SYSTEM_GET (26)
  1671.   ebx - SSF_ACCESS_HD_LBA (11)
  1672. ======================================================================
  1673. ===================== Function 26, subfunction 12 ====================
  1674. ========== Find out whether low-level PCI access is enabled. =========
  1675. ======================================================================
  1676. Parameters:
  1677.   * eax = 26 - function number
  1678.   * ebx = 12 - subfunction number
  1679. Returned value:
  1680.   * eax = 0/1 - disabled/enabled
  1681. Remarks:
  1682.   * Is used by operations with PCI bus (function 62).
  1683.   * The current implementation uses only low bit of ecx.
  1684.   * To set the current state use subfunction 12 of function 21.
  1685.  
  1686. ---------------------- Constants for registers: ----------------------
  1687.   eax - SF_SYSTEM_GET (26)
  1688.   ebx - SSF_ACCESS_PCI (12)
  1689. ======================================================================
  1690. =================== Function 29 - get system date. ===================
  1691. ======================================================================
  1692. Parameters:
  1693.   * eax = 29 - function number
  1694. Returned value:
  1695.   * eax = 0x00DDMMYY, where
  1696.     (binary-decimal coding, BCD, is used)
  1697.   * YY = two low digits of year (00..99)
  1698.   * MM = month (01..12)
  1699.   * DD = day (01..31)
  1700. Remarks:
  1701.   * To set system date use function 22.
  1702.  
  1703. ---------------------- Constants for registers: ----------------------
  1704.   eax - SF_GET_SYS_DATE (29)
  1705. ======================================================================
  1706. ============= Function 30 - work with the current folder. ============
  1707. ======================================================================
  1708.  
  1709. --------- Subfunction 1 - set current folder for the thread. ---------
  1710. Parameters:
  1711.   * eax = 30 - function number
  1712.   * ebx = 1 - subfunction number
  1713.   * ecx = pointer to ASCIIZ-string with the path to new current folder
  1714. Returned value:
  1715.   * function does not return value
  1716.  
  1717. --------- Subfunction 2 - get current folder for the thread. ---------
  1718. Parameters:
  1719.   * eax = 30 - function number
  1720.   * ebx = 2 - subfunction number
  1721.   * ecx = pointer to buffer
  1722.   * edx = size of buffer
  1723. Returned value:
  1724.   * eax = size of the current folder's name (including terminating 0)
  1725. Remarks:
  1726.   * If the buffer is too small to hold all data, only first (edx-1)
  1727.     bytes are copied and than terminating 0 is inserted.
  1728.   * By default, current folder for the thread is "/rd/1".
  1729.   * At process/thread creation the current folder will be inherited
  1730.     from the parent.
  1731.  
  1732. --- Subfunction 3 - install the add.system directory for the kernel --
  1733. Parameters:
  1734.   * eax = 30 - function number
  1735.   * ebx = 3 - subfunction number
  1736.   * ecx = pointer to a block of data:
  1737.           sysdir_name     rb 64
  1738.           sysdir_path     rb 64
  1739. For example:
  1740. dir_name1       db 'KolibriOS',0
  1741.                 rb 64-10
  1742. dir_path1       db 'HD0/1',0
  1743.                 rb 64-6
  1744. Returned value:
  1745.   * function does not return value
  1746. Remarks:
  1747.   * The function can be called only 1 time for 1 session of the OS.
  1748.  
  1749. ---------------------- Constants for registers: ----------------------
  1750.   eax - SF_CURRENT_FOLDER (30)
  1751.   ebx - SSF_SET_CF (1), SSF_GET_CF (2), SSF_ADD_SYS_FOLDER (3)
  1752. ======================================================================
  1753. ========= Function 34 - who owner the pixel on the screen. ===========
  1754. ======================================================================
  1755. Parameters:
  1756.   * eax = 34 - function number
  1757.   * ebx = x-coordinate (relative to the display)
  1758.   * ecx = y-coordinate (relative to the display)
  1759.  
  1760. Returned value:
  1761.   * eax = 0x000000XX - owner of pixel the slot window N
  1762.     If incorrect values ebx and ecx then function returns 0
  1763.   * The function takes the value from the area [_WinMapAddress]
  1764.  
  1765. ---------------------- Constants for registers: ----------------------
  1766.   eax - SF_GET_PIXEL_OWNER (34)
  1767. ======================================================================
  1768. ======= Function 35 - read the color of a pixel on the screen. =======
  1769. ======================================================================
  1770. Parameters:
  1771.   * eax = 35
  1772.   * ebx = y*xsize+x, where
  1773.   * (x,y) = coordinates of a pixel (beginning from 0)
  1774.   * xsize = horizontal screen size
  1775. Returned value:
  1776.   * eax = color 0x00RRGGBB
  1777. Remarks:
  1778.   * To get screen sizes use function 14. Pay attention,
  1779.     that it subtracts 1 from both sizes.
  1780.   * There is also direct access (without any system calls)
  1781.     to videomemory through the selector gs. To get parameters of
  1782.     the current videomode, use function 61.
  1783.  
  1784. ---------------------- Constants for registers: ----------------------
  1785.   eax - SF_GET_PIXEL (35)
  1786. ======================================================================
  1787. =================== Function 36 - read screen area. ==================
  1788. ======================================================================
  1789. Paramters:
  1790.   * eax = 36 - function number
  1791.   * ebx = pointer to the previously allocated memory area,
  1792.         where will be placed the image in the format BBGGRRBBGGRR...
  1793.   * ecx = [size on axis x]*65536 + [size on axis y]
  1794.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1795. Returned value:
  1796.   * function does not return value
  1797. Remarks:
  1798.   * Coordinates of the image are coordinates of the upper left corner
  1799.     of the image relative to the screen.
  1800.   * Size of the image in bytes is 3*xsize*ysize.
  1801.  
  1802. ---------------------- Constants for registers: ----------------------
  1803.   eax - SF_GET_IMAGE (36)
  1804. ======================================================================
  1805. =================== Function 37 - work with mouse. ===================
  1806. ======================================================================
  1807.  
  1808. ---------- Subfunction 0 - screen coordinates of the mouse -----------
  1809. Parameters:
  1810.   * eax = 37 - function number
  1811.   * ebx = 0 - subfunction number
  1812. Returned value:
  1813.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1814.     (beginning from 0)
  1815.  
  1816. -- Subfunction 1 - coordinates of the mouse relative to the window ---
  1817. Parameters:
  1818.   * eax = 37 - function number
  1819.   * ebx = 1 - subfunction number
  1820. Returned value:
  1821.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1822.     relative to the application window (beginning from 0)
  1823. Remarks:
  1824.   * The value is calculated by formula (x-xwnd)*65536 + (y-ywnd).
  1825.     If y>=ywnd, the low word is non-negative and contains
  1826.     relative y-coordinate, and the high word - relative x-coordinate
  1827.     (with correct sign). Otherwise the low word is negative and still
  1828.     contains relative y-coordinate, and to the high word
  1829.     1 should be added.
  1830.  
  1831. ------------- Subfunction 2 - states of the mouse buttons ------------
  1832. Parameters:
  1833.   * eax = 37 - function number
  1834.   * ebx = 2 - subfunction number
  1835. Returned value:
  1836.   * eax = bits 0-4 equal to subfunction 3
  1837.  
  1838. ------- Subfunction 3 - states and events of the mouse buttons -------
  1839. Parameters:
  1840.   * eax = 37 - function number
  1841.   * ebx = 3 - subfunction number
  1842. Returned value:
  1843.   * eax contains next information:
  1844.  
  1845. states:
  1846.   * bit 0 is set = left button is held
  1847.   * bit 1 is set = right button is held
  1848.   * bit 2 is set = middle button is held
  1849.   * bit 3 is set = 4th button is held
  1850.   * bit 4 is set = 5th button is held
  1851.  
  1852. events:
  1853.   * bit 8 is set = left button is pressed
  1854.   * bit 9 is set = right button is pressed
  1855.   * bit 10 is set = middle button is pressed
  1856.  
  1857.   * bit 15 is set = vertical scroll is used
  1858.  
  1859.   * bit 16 is set = left button is released
  1860.   * bit 17 is set = right button is released
  1861.   * bit 18 is set = middle button is released
  1862.  
  1863.   * bit 23 is set = horisontal scroll is used
  1864.  
  1865.   * bit 24 is set = doubleclick by left button
  1866.  
  1867. -------------------- Subfunction 4 - load cursor ---------------------
  1868. Parameters:
  1869.   * eax = 37 - function number
  1870.   * ebx = 4 - subfunction number
  1871.   * dx = data source:
  1872.   * dx = LOAD_FROM_FILE = 0 - data in a file
  1873.     * ecx = pointer to full path to the cursor file
  1874.     * the file must be in the format .cur, which is standard for
  1875.       MS Windows, at that of the size 32*32 pixels
  1876.   * dx = LOAD_FROM_MEM = 1 - data of file are already loaded in memory
  1877.     * ecx = pointer to data of the cursor file
  1878.     * the data format is the same as in the previous case
  1879.   * dx = LOAD_INDIRECT = 2 - data in memory
  1880.     * ecx = pointer to cursor image in the format ARGB 32*32 pixels
  1881.     * edx = 0xXXYY0002, where
  1882.       * XX = x-coordinate of cursor hotspot
  1883.       * YY = y-coordinate
  1884.       * 0 <= XX, YY <= 31
  1885. Returned value:
  1886.   * eax = 0 - failed
  1887.   * otherwise eax = cursor handle
  1888.  
  1889. --------------------- Subfunction 5 - set cursor ---------------------
  1890. Sets new cursor for the window of the current thread.
  1891. Parameters:
  1892.   * eax = 37 - function number
  1893.   * ebx = 5 - subfunction number
  1894.   * ecx = cursor handle
  1895. Returned value:
  1896.   * eax = handle of previous cursor
  1897. Remarks:
  1898.   * If the handle is incorrect, the function restores the default
  1899.     cursor (standard arrow). In particular, ecx=0 restores it.
  1900.  
  1901. ------------------- Subfunction 6 - delete cursor --------------------
  1902. Parameters:
  1903.   * eax = 37 - function number
  1904.   * ebx = 6 - subfunction number
  1905.   * ecx = cursor handle
  1906. Returned value:
  1907.   * eax destroyed
  1908. Remarks:
  1909.   * The cursor must be loaded previously by the current thread
  1910.     (with the call to subfunction 4). The function does not delete
  1911.     system cursors and cursors, loaded by another applications.
  1912.   * If the active cursor (set by subfunction 5) is deleted,
  1913.     the system restores the default cursor (standard arrow).
  1914.  
  1915. ------------------ Subfunction 7 - get scroll data -------------------
  1916. Parameters:
  1917.   * eax = 37 - function number
  1918.   * ebx = 7 - subfunction number
  1919. Returned value:
  1920.   * eax = [horizontal offset]*65536 + [vertical offset]
  1921. Remarks:
  1922.   * Scroll data is available for active window only.
  1923.   * Values are zeroed after reading.
  1924.   * Values are signed.
  1925.  
  1926. ---------------------- Constants for registers: ----------------------
  1927.   eax - SF_MOUSE_GET (37)
  1928.   ebx - SSF_SCREEN_POSITION (0), SSF_WINDOW_POSITION (1),
  1929.     SSF_BUTTON (2), SSF_BUTTON_EXT (3), SSF_LOAD_CURSOR (4),
  1930.     SSF_SET_CURSOR (5), SSF_DEL_CURSOR (6), SSF_SCROLL_DATA (7)
  1931. ======================================================================
  1932. ====================== Function 38 - draw line. ======================
  1933. ======================================================================
  1934. Parameters:
  1935.   * eax = 38 - function number
  1936.   * ebx = [start coordinate on axis x]*65536 +
  1937.               [end coordinate on axis x]
  1938.   * ecx = [start coordinate on axis y]*65536 +
  1939.               [end coordinate on axis y]
  1940.   * edx = 0x00RRGGBB - color
  1941.     edx = 0x01xxxxxx - draw inversed line
  1942.           (low 24 bits are ignored)
  1943. Returned value:
  1944.   * function does not return value
  1945. Remarks:
  1946.   * Coordinates are relative to the window.
  1947.   * End point is also drawn.
  1948.  
  1949. ---------------------- Constants for registers: ----------------------
  1950.   eax - SF_DRAW_LINE (38)
  1951. ======================================================================
  1952. == Function 39, subfunction 1 - get a size of the background image. ==
  1953. ======================================================================
  1954. Parameters:
  1955.   * eax = 39 - function number
  1956.   * ebx = 1 - subfunction number
  1957. Returned value:
  1958.   * eax = [width]*65536 + [height]
  1959. Remarks:
  1960.   * There is a pair function to set sizes of background image -
  1961.     subfunction 1 of function 15. After which it is necessary,
  1962.     of course, anew to define image.
  1963.  
  1964. ---------------------- Constants for registers: ----------------------
  1965.   eax - SF_BACKGROUND_GET (39)
  1966. ======================================================================
  1967. == Function 39, subfunction 2 - get pixel from the background image. =
  1968. ======================================================================
  1969. Parameters:
  1970.   * eax = 39 - function number
  1971.   * ebx = 2 - subfunction number
  1972.   * ecx = offset
  1973. Returned value:
  1974.   * eax = 0x00RRGGBB - pixel color, if offset is valid
  1975.     (less than 0x160000-16)
  1976.   * eax = 2 otherwise
  1977. Remarks:
  1978.   * Do not rely on returned value for invalid offsets, it may be
  1979.     changed in future kernel versions.
  1980.   * Offset for pixel with coordinates (x,y)
  1981.     is calculated as (x+y*xsize)*3.
  1982.   * There is a pair function to set pixel on the background image -
  1983.     subfunction 2 of function 15.
  1984.  
  1985. ---------------------- Constants for registers: ----------------------
  1986.   eax - SF_BACKGROUND_GET (39)
  1987. ======================================================================
  1988. == Function 39, subfunction 4 - get drawing mode for the background. =
  1989. ======================================================================
  1990. Parameters:
  1991.   * eax = 39 - function number
  1992.   * ebx = 4 - subfunction number
  1993. Returned value:
  1994.   * eax = 1 - tile
  1995.   * eax = 2 - stretch
  1996. Remarks:
  1997.   * There is a pair function to set drawing mode -
  1998.     subfunction 4 of function 15.
  1999.  
  2000. ---------------------- Constants for registers: ----------------------
  2001.   eax - SF_BACKGROUND_GET (39)
  2002. ======================================================================
  2003. =========== Function 40 - set the mask for expected events. ==========
  2004. ======================================================================
  2005. The mask for expected events affects function working with events
  2006. 10, 11, 23 - they notify only about events allowed by this mask.
  2007. Parameters:
  2008.   * eax = 40 - function number
  2009.   * ebx = mask: bit i corresponds to event i+1 (see list of events)
  2010.     (set bit permits notice on event)
  2011.     bit 31: mouse active/inactive filter
  2012.     bit 31 = 0 - inactive window receive mouse events
  2013.     bit 31 = 1 - inactive window does not receive mouse events
  2014.     bit 30: cursor position filter
  2015.     bit 30 = 0 = the window receive mouse events if cursor
  2016.                  outside window
  2017.     bit 30 = 1 - the window does not receive mouse events if cursor
  2018.                  outside window
  2019. Returned value:
  2020.   * eax = previous value of mask
  2021. Remarks:
  2022.   * Default mask (7=111b) enables nofices about redraw,
  2023.     keys and buttons. This is enough for many applications.
  2024.   * Events prohibited in the mask are saved anyway, when come;
  2025.     they are simply not informed with event functions.
  2026.   * Event functions take into account the mask on moment of
  2027.     function call, not on moment of event arrival.
  2028.  
  2029. ---------------------- Constants for registers: ----------------------
  2030.   eax - SF_SET_EVENTS_MASK (40)
  2031. ======================================================================
  2032. ================ Function 43 - input/output to a port. ===============
  2033. ======================================================================
  2034.  
  2035. ------------------------ Output data to port -------------------------
  2036. Parameters:
  2037.   * eax = 43 - function number
  2038.   * bl = byte for output
  2039.   * ecx = port number 0xnnnn (from 0 to 0xFFFF)
  2040. Returned value:
  2041.   * eax = 0 - success
  2042.   * eax = 1 - the thread has not reserved the selected port
  2043.  
  2044. ------------------------ Input data from port ------------------------
  2045. Parameters:
  2046.   * eax = 43 - function number
  2047.   * ebx is ignored
  2048.   * ecx = 0x8000nnnn, where nnnn = port number (from 0 to 0xFFFF)
  2049. Returned value:
  2050.   * eax = 0 - success, thus ebx = entered byte
  2051.   * eax = 1 - the thread has not reserved the selected port
  2052. Remarks:
  2053.   * Previously the thread must reserve the selected port
  2054.     for itself by function 46.
  2055.   * Instead of call to this function it is better to use
  2056.     processor instructions in/out - this is much
  2057.     faster and a bit shorter and easier.
  2058.  
  2059. ---------------------- Constants for registers: ----------------------
  2060.   eax - SF_PORT_IN_OUT (43)
  2061. ======================================================================
  2062. ====== Function 46 - reserve/free a group of input/output ports. =====
  2063. ======================================================================
  2064. To work with reserved ports an application can access directly by
  2065. commands in/out (recommended way) and can use function 43
  2066. (not recommended way).
  2067. Parameters:
  2068.   * eax = 46 - function number
  2069.   * ebx = 0 - reserve, 1 - free
  2070.   * ecx = start port number
  2071.   * edx = end port number (inclusive)
  2072. Returned value:
  2073.   * eax = 0 - success
  2074.   * eax = 1 - error
  2075. Remarks:
  2076.   * For ports reservation: an error occurs if and only if
  2077.     one from the following condition satisfies:
  2078.     * start port is more than end port;
  2079.     * the selected range contains incorrect port number
  2080.       (correct are from 0 to 0xFFFF);
  2081.     * limit for the total number of reserved areas is exceeded
  2082.       (maximum 255 are allowed);
  2083.     * the selected range intersects with any of earlier reserved
  2084.   * For ports free: an error is an attempt to free range,
  2085.     that was not earlier reserved by this function
  2086.     (with same ecx,edx).
  2087.   * If an error occurs (for both cases) function performs no action.
  2088.   * At booting the system reserves for itself ports
  2089.     0..0x2d, 0x30..0x4d, 0x50..0xdf, 0xe5..0xff (inclusively).
  2090.   * When a thread terminates, all reserved by it ports
  2091.     are freed automatically.
  2092.  
  2093. ---------------------- Constants for registers: ----------------------
  2094.   eax - SF_SET_PORTS (46)
  2095. ======================================================================
  2096. ============= Function 47 - draw a number in the window. =============
  2097. ======================================================================
  2098. Parameters:
  2099.   * eax = 47 - function number
  2100.   * ebx = parameters of conversion number to text:
  2101.     * bl = 0 - ecx contains number
  2102.     * bl = 1 - ecx contains pointer to dword/qword-number
  2103.     * bh = 0 - display in decimal number system
  2104.     * bh = 1 - display in hexadecimal system
  2105.     * bh = 2 - display in binary system
  2106.     * bits 16-21 = how many digits to display
  2107.     * bits 22-29 reserved and must be set to 0
  2108.     * bit 30 set = display qword (64-bit) number (must be bl=1)
  2109.     * bit 31 set = do not display leading zeroes of the number
  2110.   * ecx = number (if bl=0) or pointer (if bl=1)
  2111.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  2112.   * esi = 0xX0RRGGBB:
  2113.     * RR, GG, BB specify the color
  2114.     * X = ABnn (bits)
  2115.     * nn = font (0/1)
  2116.     * A is ignored
  2117.     * B=1 - fill background with the color edi
  2118. Returned value:
  2119.   * function does not return value
  2120. Remarks:
  2121.   * The given length must not exceed 60.
  2122.   * The exactly given amount of digits is output. If number is small
  2123.     and can be written by smaller amount of digits, it is supplemented
  2124.     by leading zeroes; if the number is big and can not be written by
  2125.     given amount of digits, extra digits are not drawn.
  2126.   * Parameters of fonts are shown in the description of function 4
  2127.     (text output).
  2128.  
  2129. ---------------------- Constants for registers: ----------------------
  2130.   eax - SF_DRAW_NUMBER (47)
  2131. ======================================================================
  2132. ========= Function 48, subfunction 0 - apply screen settings. ========
  2133. ======================================================================
  2134. Parameters:
  2135.   * eax = 48 - function number
  2136.   * ebx = 0 - subfunction number
  2137.   * ecx = 0 - reserved
  2138. Returned value:
  2139.   * function does not return value
  2140. Remarks:
  2141.   * Function redraws the screen after parameters change by
  2142.     subfunctions 1 and 2.
  2143.   * Function call without prior call to one of indicated subfunctions
  2144.     is ignored.
  2145.   * Function call with nonzero ecx is ignored.
  2146.  
  2147. ---------------------- Constants for registers: ----------------------
  2148.   eax - SF_STYLE_SETTINGS (48)
  2149.   ebx - SSF_APPLY (0)
  2150. ======================================================================
  2151. =========== Function 48, subfunction 1 - set button style. ===========
  2152. ======================================================================
  2153. Parameters:
  2154.   * eax = 48 - function number
  2155.   * ebx = 1 - subfunction number
  2156.   * ecx = button style:
  2157.     * 0 = flat
  2158.     * 1 = 3d
  2159. Returned value:
  2160.   * function does not return value
  2161. Remarks:
  2162.   * After call to this function one should redraw the screen by
  2163.     subfunction 0.
  2164.   * Button style influences only to their draw of function 8.
  2165.  
  2166. ---------------------- Constants for registers: ----------------------
  2167.   eax - SF_STYLE_SETTINGS (48)
  2168.   ebx - SSF_SET_BUTTON_STYLE (1)
  2169. ======================================================================
  2170. ====== Function 48, subfunction 2 - set standard window colors. ======
  2171. ======================================================================
  2172. Parameters:
  2173.   * eax = 48 - function number
  2174.   * ebx = 2 - subfunction number
  2175.   * ecx = pointer to the color table
  2176.   * edx = size of the color table
  2177.     (must be 40 bytes for future compatibility)
  2178. Format of the color table is shown in description of subfunction 3.
  2179. Returned value:
  2180.   * function does not return value
  2181. Remarks:
  2182.   * After call to this function one should redraw the screen by
  2183.     subfunction 0.
  2184.   * Table of standard colors influences only to applications,
  2185.     which receive this table obviously (by subfunction 3)
  2186.     and use it (specifying colors from it to drawing functions).
  2187.   * Table of standard colors is included in skin and is installed
  2188.     anew with skin installation (by subfunction 8).
  2189.   * Color table can be viewed/changed interactively with
  2190.     the application 'desktop'.
  2191.  
  2192. ---------------------- Constants for registers: ----------------------
  2193.   eax - SF_STYLE_SETTINGS (48)
  2194.   ebx - SSF_SET_COLORS (2)
  2195. ======================================================================
  2196. ====== Function 48, subfunction 3 - get standard window colors. ======
  2197. ======================================================================
  2198. Parameters:
  2199.   * eax = 48 - function number
  2200.   * ebx = 3 - subfunction number
  2201.   * ecx = pointer to the buffer with size edx bytes,
  2202.     where table will be written
  2203.   * edx = size of color table
  2204.     (must be 40 bytes for future compatibility)
  2205. Returned value:
  2206.   * function does not return value
  2207. Format of the color table:
  2208. each item is dword-value for color 0x00RRGGBB
  2209.   * +0: dword: frames - color of frame
  2210.   * +4: dword: grab - color of header
  2211.   * +8: dword: grab_button - color of button on header bar
  2212.   * +12 = +0xC: dword: grab_button_text - color of text on button
  2213.     on header bar
  2214.   * +16 = +0x10: dword: grab_text - color of text on header
  2215.   * +20 = +0x14: dword: work - color of working area
  2216.   * +24 = +0x18: dword: work_button - color of button in working area
  2217.   * +28 = +0x1C: dword: work_button_text - color of text on button
  2218.     in working area
  2219.   * +32 = +0x20: dword: work_text - color of text in working area
  2220.   * +36 = +0x24: dword: work_graph - color of graphics in working area
  2221. Remarks:
  2222.   * Structure of the color table is described in the standard
  2223.     include file 'macros.inc' as 'system_colors'; for example,
  2224.     it is possible to write:
  2225.         sc      system_colors           ; variable declaration
  2226.         ...                             ; somewhere one must call
  2227.                                         ; this function with ecx=sc
  2228.         mov     ecx, [sc.work_button_text]      ; read text color on
  2229.                                         ; buttin in working area
  2230.   * A program itself desides to use or not to use color table.
  2231.     For usage program must simply at calls to drawing functions select
  2232.     color taken from the table.
  2233.   * At change of the table of standard colors (by subfunction 2 with
  2234.     the subsequent application of changes by subfunction 0 or
  2235.     at skin set by subfunction 8) the system sends to all windows
  2236.     redraw message (the event with code 1).
  2237.   * Color table can be viewed/changed interactively with
  2238.     the application 'desktop'.
  2239.  
  2240. ---------------------- Constants for registers: ----------------------
  2241.   eax - SF_STYLE_SETTINGS (48)
  2242.   ebx - SSF_GET_COLORS (3)
  2243. ======================================================================
  2244. ============ Function 48, subfunction 4 - get skin height. ===========
  2245. ======================================================================
  2246. Parameters:
  2247.   * eax = 48 - function number
  2248.   * ebx = 4 - subfunction number
  2249. Returned value:
  2250.   * eax = skin height
  2251. Remarks:
  2252.   * Skin height is defined as the height of a header
  2253.     of skinned windows.
  2254.   * See also general structure of window in the description
  2255.     of function 0.
  2256.  
  2257. ---------------------- Constants for registers: ----------------------
  2258.   eax - SF_STYLE_SETTINGS (48)
  2259.   ebx - SSF_GET_SKIN_HEIGHT (4)
  2260. ======================================================================
  2261. ======== Function 48, subfunction 5 - get screen working area. =======
  2262. ======================================================================
  2263. Parameters:
  2264.   * eax = 48 - function number
  2265.   * ebx = 5 - subfunction number
  2266. Returned value:
  2267.   * eax = [left]*65536 + [right]
  2268.   * ebx = [top]*65536 + [bottom]
  2269. Remarks:
  2270.   * The screen working area defines position and coordinates of
  2271.     a maximized window.
  2272.   * The screen working area in view of normal work is all screen
  2273.     without taskbar ('@taskbar' application).
  2274.   * (left,top) are coordinates of the left upper corner,
  2275.     (right,bottom) are coordinates of the right lower one.
  2276.     Thus the size of working area on x axis can be calculated by
  2277.     formula right-left+1, on y axis - by formula bottom-right+1.
  2278.   * See also function 14,
  2279.     to get sizes of all screen.
  2280.   * There is a pair function to set working area - subfunction 6.
  2281.  
  2282. ---------------------- Constants for registers: ----------------------
  2283.   eax - SF_STYLE_SETTINGS (48)
  2284.   ebx - SSF_GET_SCREEN_AREA (5)
  2285. ======================================================================
  2286. ======== Function 48, subfunction 6 - set screen working area. =======
  2287. ======================================================================
  2288. Parameters:
  2289.   * eax = 48 - function number
  2290.   * ebx = 6 - subfunction number
  2291.   * ecx = [left]*65536 + [right]
  2292.   * edx = [top]*65536 + [bottom]
  2293. Returned value:
  2294.   * function does not return value
  2295. Remarks:
  2296.   * The screen working area defines position and coordinates of
  2297.     a maximized window.
  2298.   * This function is used only by the application '@taskbar',
  2299.     which set working area to all screen without taskbar.
  2300.   * (left,top) are coordinates of the left upper corner,
  2301.     (right,bottom) are coordinates of the right lower one.
  2302.     Thus the size of working area on x axis can be calculated by
  2303.     formula right-left+1, on y axis - by formula bottom-right+1.
  2304.   * If 'left'>='right', x-coordinate of working area is not changed.
  2305.     If 'left'<0, 'left' will not be set. If 'right' is greater than or
  2306.     equal to screen width, 'right' will not be set.
  2307.     Similarly on y axis.
  2308.   * See also function 14,
  2309.     to get sizes of all screen.
  2310.   * There is a pair function to get working area - subfunction 5.
  2311.   * This function redraws the screen automatically,
  2312.     updating coordinates and sizes of maximized windows.
  2313.     The system sends to all windows redraw message (the event 1).
  2314.  
  2315. ---------------------- Constants for registers: ----------------------
  2316.   eax - SF_STYLE_SETTINGS (48)
  2317.   ebx - SSF_SET_SCREEN_AREA (6)
  2318. ======================================================================
  2319. =========== Function 48, subfunction 7 - get skin margins. ===========
  2320. ======================================================================
  2321. Returns the area of a header of a skinned window, intended for
  2322. a text of a header.
  2323. Parameters:
  2324.   * eax = 48 - function number
  2325.   * ebx = 7 - subfunction number
  2326. Returned value:
  2327.   * eax = [left]*65536 + [right]
  2328.   * ebx = [top]*65536 + [bottom]
  2329. Remarks:
  2330.   * An application decides itself to use or not to use this function.
  2331.   * It is recommended to take into account returned value
  2332.     of this function for choice of a place for drawing header text
  2333.     (by function 4) or a substitute of header text
  2334.     (at the discretion of an application).
  2335.  
  2336. ---------------------- Constants for registers: ----------------------
  2337.   eax - SF_STYLE_SETTINGS (48)
  2338.   ebx - SSF_GET_SKIN_MARGINS (7)
  2339. ======================================================================
  2340. ============= Function 48, subfunction 8 - set used skin. ============
  2341. ======================================================================
  2342. Parameters:
  2343.   * eax = 48 - function number
  2344.   * ebx = 8 - subfunction number
  2345.   * ecx = pointer to filename of the skin
  2346. Returned value:
  2347.   * eax = 0 - success
  2348.   * otherwise eax = file system error code; if file does not
  2349.     contain valid skin, function returns error 3
  2350.     (unknown file system).
  2351. Remarks:
  2352.   * After successful skin loading the system sends to all windows
  2353.     redraw message (the event 1).
  2354.   * At booting the system reads skin from file 'default.skn'
  2355.     on ramdisk.
  2356.   * User can change the skin statically by creating hisself
  2357.     'default.skn' or dynamically with the application 'desktop'.
  2358.  
  2359. ---------------------- Constants for registers: ----------------------
  2360.   eax - SF_STYLE_SETTINGS (48)
  2361.   ebx - SSF_SET_SKIN (8)
  2362. ======================================================================
  2363. ====== Function 48, subfunction 9 - get font smoothing setting. ======
  2364. ======================================================================
  2365. Parameters:
  2366.   * eax = 48 - function number
  2367.   * ebx = 9 - subfunction number
  2368. Returned value:
  2369.   * eax = 2 - subpixel, 1 - anti-aliasing, 0 - off
  2370.  
  2371. ---------------------- Constants for registers: ----------------------
  2372.   eax - SF_STYLE_SETTINGS (48)
  2373.   ebx - SSF_GET_FONT_SMOOTH (9)
  2374. ======================================================================
  2375. ========== Function 48, subfunction 10 - set font smoothing. =========
  2376. ======================================================================
  2377. Parameters:
  2378.   * eax = 48 - function number
  2379.   * ebx = 10 - subfunction number
  2380.   * cl  = 2 - subpixel, 1 - anti-aliasing, 0 - off
  2381.  
  2382. ---------------------- Constants for registers: ----------------------
  2383.   eax - SF_STYLE_SETTINGS (48)
  2384.   ebx - SSF_SET_FONT_SMOOTH (10)
  2385. ======================================================================
  2386. ============ Function 48, subfunction 11 - get font size. ============
  2387. ======================================================================
  2388. Parameters:
  2389.   * eax = 48 - function number
  2390.   * ebx = 9 - subfunction number
  2391. Returned value:
  2392.   * eax = current font height in pixels
  2393.  
  2394. ---------------------- Constants for registers: ----------------------
  2395.   eax - SF_STYLE_SETTINGS (48)
  2396.   ebx - SSF_GET_FONT_SIZE (11)
  2397. ======================================================================
  2398. ============ Function 48, subfunction 12 - set font size. ============
  2399. ======================================================================
  2400. Parameters:
  2401.   * eax = 48 - function number
  2402.   * ebx = 10 - subfunction number
  2403.   * cl  = new font height in pixels
  2404.  
  2405. ---------------------- Constants for registers: ----------------------
  2406.   eax - SF_STYLE_SETTINGS (48)
  2407.   ebx - SSF_SET_FONT_SIZE (12)
  2408. ======================================================================
  2409. =========== Function 49 - Advanced Power Management (APM). ===========
  2410. ======================================================================
  2411. Parameters:
  2412.   * eax = 49 - function number
  2413.   * dx = number of the APM function
  2414.     (analogue of ax in APM specification)
  2415.   * bx, cx = parameters of the APM function
  2416. Returned value:
  2417.   * 16-bit registers ax, bx, cx, dx, si, di and carry flag CF
  2418.     are set according to the APM specification
  2419.   * high halves of 32-bit registers eax, ebx, ecx,
  2420.     edx, esi, edi are destroyed
  2421. Remarks:
  2422.   * APM 1.2 specification is described in the document
  2423.     "Advanced Power Management (APM) BIOS Specification"
  2424.     (Revision 1.2), available at
  2425.     http://www.microsoft.com/whdc/archive/amp_12.mspx;
  2426.     besides it is included in famous Interrupt List by Ralf Brown
  2427.     (http://www.pobox.com/~ralf/files.html,
  2428.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/).
  2429.  
  2430. ---------------------- Constants for registers: ----------------------
  2431.   eax - SF_APM (49)
  2432. ======================================================================
  2433. =================== Function 50 - set window shape. ==================
  2434. ======================================================================
  2435. Normal windows have rectangular shape. This function can give to
  2436. a window any shape. The shape is given by a set of points inside
  2437. the base rectangle belonging to a window. Position and coordinates
  2438. of the base rectangle are set by function 0
  2439. and changed by function 67.
  2440.  
  2441. --------------------------- Set shape data ---------------------------
  2442. Parameters:
  2443.   * eax = 50 - function number
  2444.   * ebx = 0 - subfunction number
  2445.   * ecx = pointer to shape data (array of bytes 0/1)
  2446. Returned value:
  2447.   * function does not return value
  2448.  
  2449. -------------------------- Set shape scale ---------------------------
  2450. Parameters:
  2451.   * eax = 50 - function number
  2452.   * ebx = 1 - subfunction number
  2453.   * ecx sets a scale: each byte of data defines
  2454.     (2^scale)*(2^scale) pixels
  2455. Returned value:
  2456.   * function does not return value
  2457. Remarks:
  2458.   * Default scale is 0 (scale factor is 1). If in the shape data
  2459.     one byte corresponds to one pixel, there is no necessity
  2460.     to set scale.
  2461.   * Let's designate xsize = window width (in pixels), ysize = height;
  2462.     pay attention, that they are one pixel more than defined by
  2463.     functions 0, 67.
  2464.   * On definition of scale xsize and ysize must be divisible
  2465.     on 2^scale.
  2466.   * Byte of data on offset 'a' must be 0/1 and defines belonging
  2467.     to a window of square with the side 2^scale (if scale=0,
  2468.     this is one pixel) and coordinates of the left upper corner
  2469.     (a mod (xsize shr scale), a div (xsize shr scale))
  2470.   * Data size: (xsize shr scale)*(ysize shr scale).
  2471.   * Data must be presented in the memory and not change
  2472.     after set of shape.
  2473.   * The system views the shape data at every window redraw by
  2474.     function 0.
  2475.   * The call of subfunction 0 with NULL pointer results in return
  2476.     to the rectangular shape.
  2477.  
  2478. ---------------------- Constants for registers: ----------------------
  2479.   eax - SF_SET_WINDOW_SHAPE (50)
  2480. ======================================================================
  2481. ==================== Function 51 - create thread. ====================
  2482. ======================================================================
  2483. Parameters:
  2484.   * eax = 51 - function number
  2485.   * ebx = 1 - unique subfunction
  2486.   * ecx = address of thread entry point (starting eip)
  2487.   * edx = pointer to thread stack (starting esp)
  2488. Returned value:
  2489.   * eax = -1 - error (there is too many threads)
  2490.   * otherwise eax = TID - thread identifier
  2491.  
  2492. ---------------------- Constants for registers: ----------------------
  2493.   eax - SF_CREATE_THREAD (51)
  2494. ======================================================================
  2495. ==================== Function 54, subfunction 0 ======================
  2496. ============== Get the number of slots in the clipboard. =============
  2497. ======================================================================
  2498. Parameters:
  2499.   * eax = 54 - function number
  2500.   * ebx = 0 - subfunction number
  2501. Returned value:
  2502.   * eax = slots in the clipboard
  2503.   * eax = -1 - main list area not found
  2504.  
  2505. ---------------------- Constants for registers: ----------------------
  2506.   eax - SF_CLIPBOARD (54)
  2507.   ebx - SSF_GET_SLOT_COUNT (0)
  2508. ======================================================================
  2509. ==================== Function 54, subfunction 1 ======================
  2510. ================= Read the data from the clipboard. ==================
  2511. ======================================================================
  2512. Parameters:
  2513.   * eax = 54 - function number
  2514.   * ebx = 1 - subfunction number
  2515.   * eсx = slot number
  2516. Returned value:
  2517.   * eax = if successful - pointer to a memory with data
  2518.   * eax = 1 - error
  2519.   * eax = -1 - main list area not found
  2520.  
  2521. ---------------------- Constants for registers: ----------------------
  2522.   eax - SF_CLIPBOARD (54)
  2523.   ebx - SSF_READ_CB (1)
  2524. ======================================================================
  2525. ==================== Function 54, subfunction 2 ======================
  2526. ================= Write the data to the clipboard. ===================
  2527. ======================================================================
  2528. Parameters:
  2529.   * eax = 54 - function number
  2530.   * ebx = 2 - subfunction number
  2531.   * eсx = the number of bytes to be copied
  2532.   * edx = a pointer to a buffer for data to be copied
  2533. Returned value:
  2534.   * eax = 0 - success
  2535.   * eax = 1 - error
  2536.   * eax = -1 - main list area not found
  2537.  
  2538. ---------------------- Constants for registers: ----------------------
  2539.   eax - SF_CLIPBOARD (54)
  2540.   ebx - SSF_WRITE_CB (2)
  2541. ======================================================================
  2542. ===================== Function 54, subfunction 3 =====================
  2543. ================ Delete the last slot in the clipboard ===============
  2544. ======================================================================
  2545. Parameters:
  2546.   * eax = 54 - function number
  2547.   * ebx = 3 - subfunction number
  2548. Returned value:
  2549.   * eax = 0 - success
  2550.   * eax = 1 - error
  2551.   * eax = -1 - main list area not found
  2552.  
  2553. ---------------------- Constants for registers: ----------------------
  2554.   eax - SF_CLIPBOARD (54)
  2555.   ebx - SSF_DEL_SLOT (3)
  2556. ======================================================================
  2557. ===================== Function 54, subfunction 4 =====================
  2558. ===================== Alarm reset the lock buffer ====================
  2559. ======================================================================
  2560. Parameters:
  2561.   * eax = 54 - function number
  2562.   * ebx = 4 - subfunction number
  2563. Returned value:
  2564.   * eax = 0 - success
  2565.   * eax = -1 - main list area not found or no blocking
  2566. Remarks:
  2567.   * Used in exceptional cases, where no responsible or killed
  2568.     application blocked the clipboard operations.
  2569.  
  2570. ---------------------- Constants for registers: ----------------------
  2571.   eax - SF_CLIPBOARD (54)
  2572.   ebx - SSF_UNLOCK_BUFFER (4)
  2573. ======================================================================
  2574.  Function 55, subfunction 55 - begin to play data on built-in speaker.
  2575. ======================================================================
  2576. Parameters:
  2577.   * eax = 55 - function number
  2578.   * ebx = 55 - subfunction number
  2579.   * esi = pointer to data
  2580. Returned value:
  2581.   * eax = 0 - success
  2582.   * eax = 55 - error (speaker is off or busy)
  2583. Data is an array of items with variable length.
  2584. Format of each item is defined by first byte:
  2585.   * 0 = end of data
  2586.   * 1..0x80 = sets sound duration on 1/100 of second; sound note
  2587.     is defined by immediate value of frequency
  2588.     * following word (2 bytes) contains frequency divider;
  2589.       frequency is defined as 1193180/divider
  2590.   * 0x81 = invalid
  2591.   * 0x82..0xFF = note is defined by octave and number:
  2592.     * duration in 1/100 of second = (first byte)-0x81
  2593.     * there is one more byte;
  2594.     * (second byte)=0xFF - delay
  2595.     * otherwise it looks like a*0x10+b, where b=number of the note in
  2596.       an octave from 1 to 12, a=number of octave (beginning from 0)
  2597. Remarks:
  2598.   * Speaker play can be disabled/enabled by
  2599.     subfunction 8 of function 18.
  2600.   * Function returns control, having informed the system
  2601.     an information on request. Play itself goes independently from
  2602.     the program.
  2603.   * The data must be kept in the memory at least up to the end
  2604.     of play.
  2605.  
  2606. ---------------------- Constants for registers: ----------------------
  2607.   eax - SF_SPEAKER_PLAY (55)
  2608. ======================================================================
  2609. ======================= Function 57 - PCI BIOS. ======================
  2610. ======================================================================
  2611. Parameters:
  2612.   * eax = 57 - function number
  2613.   * ebp corresponds to al in PCI BIOS specification
  2614.   * other registers are set according to PCI BIOS specification
  2615. Returned value:
  2616.   * CF is undefined
  2617.   * other registers are set according to PCI BIOS specification
  2618. Remarks:
  2619.   * Many effects of this function can be also achieved with
  2620.     corresponding subfunctions of function 62.
  2621.   * The function calls PCI32 BIOS extension, documented e.g. in
  2622.     http://alpha1.dyns.net/files/PCI/bios21.pdf.
  2623.   * If BIOS does not support this extension, its behavior is emulated
  2624.     (through kernel-mode analogues of subfunctions of function 62).
  2625.  
  2626. ---------------------- Constants for registers: ----------------------
  2627.   eax - SF_PCI_BIOS (57)
  2628. ======================================================================
  2629. ========== Function 60 - Inter Process Communication (IPC). ==========
  2630. ======================================================================
  2631. IPC is used for message dispatching from one process/thread to
  2632. another. Previously it is necessary to agree how to interpret
  2633. the concrete message.
  2634.  
  2635. ----------- Subfunction 1 - set the area for IPC receiving -----------
  2636. Is called by process-receiver.
  2637. Parameters:
  2638.   * eax = 60 - function number
  2639.   * ebx = 1 - subfunction number
  2640.   * ecx = pointer to the buffer
  2641.   * edx = size of the buffer
  2642. Returned value:
  2643.   * eax = 0 - always success
  2644. Format of IPC-buffer:
  2645.   * +0: dword: if nonzero, buffer is considered locked;
  2646.     lock/unlock the buffer, when you work with it and need that
  2647.     buffer data are not changed from outside (no new messages)
  2648.   * +4: dword: occupied place in the buffer (in bytes)
  2649.   * +8: first message
  2650.   * +8+n: second message
  2651.   * ...
  2652. Format of a message:
  2653.   * +0: dword: PID of sender
  2654.   * +4: dword: message length (not including this header)
  2655.   * +8: n*byte: message data
  2656.  
  2657. ------------------ Subfunction 2 - send IPC message ------------------
  2658. Is called by process-sender.
  2659. Parameters:
  2660.   * eax = 60 - function number
  2661.   * ebx = 2 - subfunction number
  2662.   * ecx = PID of receiver
  2663.   * edx = pointer to the message data
  2664.   * esi = message length (in bytes)
  2665. Returned value:
  2666.   * eax = 0 - success
  2667.   * eax = 1 - the receiver has not defined buffer for IPC messages
  2668.     (can be, still have no time,
  2669.     and can be, this is not right process)
  2670.   * eax = 2 - the receiver has blocked IPC-buffer; try to wait a bit
  2671.   * eax = 3 - overflow of IPC-buffer of the receiver
  2672.   * eax = 4 - process/thread with such PID does not exist
  2673. Remarks:
  2674.   * Immediately after writing of IPC-message to the buffer the system
  2675.     sends to the receiver the event with code 7 (see event codes).
  2676.  
  2677. ---------------------- Constants for registers: ----------------------
  2678.   eax - SF_IPC (60)
  2679.   ebx - SSF_SET_AREA (1), SSF_SEND_MESSAGE (2)
  2680. ======================================================================
  2681. ==== Function 61 - get parameters for the direct graphics access. ====
  2682. ======================================================================
  2683. The data of the graphics screen (the memory area which displays
  2684. screen contents) are accessible to a program directly, without
  2685. any system calls, through the selector gs:
  2686.         mov     eax, [gs:0]
  2687. places in eax the first dword of the buffer, which contains
  2688. information on color of the left upper point (and, possibly, colors
  2689. of several following).
  2690.         mov     [gs:0], eax
  2691. by work in VESA modes with LFB sets color of the left upper point
  2692. (and, possibly, colors of several following).
  2693. To interpret the data of graphics screen program needs to know
  2694. some parameters, returning by this function.
  2695. Remarks:
  2696.   * Graphics parameters changes very seldom at work,
  2697.     namely, only in cases, when user works with the application VRR.
  2698.   * At videomode change the system redraws all windows (event
  2699.     with code 1) and redraws the background (event 5).
  2700.     Same events occur in other cases too, which meet much more often,
  2701.     than videomode change.
  2702.   * By operation in videomodes with LFB the selector gs points to
  2703.     LFB itself, so reading/writing on gs result directly in
  2704.     change of screen contents. By operation in videomodes without
  2705.     LFB gs points to some data area in the kernel, and all functions
  2706.     of screen output fulfil honesty double operation on writing
  2707.     directly to the screen and writing to this buffer. In result
  2708.     at reading contents of this buffer the results correspond to
  2709.     screen contents (with, generally speaking, large color
  2710.     resolution), and writing is ignored.
  2711.     One exception is the mode 320*200, for which main loop of the
  2712.     system thread updates the screen according to mouse movements.
  2713.  
  2714. ------------------------- Screen resolution --------------------------
  2715. Parameters:
  2716.   * eax = 61 - function number
  2717.   * ebx = 1 - subfunction number
  2718. Returned value:
  2719.   * eax = [resolution on x axis]*65536 + [resolution on y axis]
  2720. Remarks:
  2721.   * One can use function 14 paying attention that
  2722.     it returns sizes on 1 pixel less. It is fully equivalent way.
  2723.  
  2724. ---------------------- Number of bits per pixel ----------------------
  2725. Parameters:
  2726.   * eax = 61 - function number
  2727.   * ebx = 2 - subfunction number
  2728. Returned value:
  2729.   * eax = number of bits per pixel (24 or 32)
  2730.  
  2731. -------------------- Number of bytes per scanline --------------------
  2732. Parameters:
  2733.   * eax = 61 - function number
  2734.   * ebx = 3 - subfunction number
  2735. Returned value:
  2736.   * eax = number of bytes occupied by one scanline
  2737.     (horizontal line on the screen)
  2738.  
  2739. ---------------------- Constants for registers: ----------------------
  2740.   eax - SF_GET_GRAPHICAL_PARAMS (61)
  2741.   ebx - SSF_SCREEN_SIZE (1), SSF_BITS_PER_PIXEL (2),
  2742.     SSF_BYTES_PER_LINE (3)
  2743. ======================================================================
  2744. ===== Function 62, subfunction 0 - get version of PCI-interface. =====
  2745. ======================================================================
  2746. Parameters:
  2747.   * eax = 62 - function number
  2748.   * bl = 0 - subfunction number
  2749. Returned value:
  2750.   * eax = -1 - PCI access is disabled; otherwise
  2751.   * ah.al = version of PCI-interface (ah=version, al=subversion)
  2752.   * high word of eax is zeroed
  2753. Remarks:
  2754.   * Previously low-level access to PCI for applications must be
  2755.     enabled by subfunction 12 of function 21.
  2756.   * If PCI BIOS is not supported, the value of ax is undefined.
  2757.  
  2758. ---------------------- Constants for registers: ----------------------
  2759.   eax - SF_PCI (62)
  2760.   ebx - SSF_GET_VERSION (0)
  2761. ======================================================================
  2762. ==== Function 62, subfunction 1 - get number of the last PCI-bus. ====
  2763. ======================================================================
  2764. Parameters:
  2765.   * eax = 62 - function number
  2766.   * bl = 1 - subfunction number
  2767. Returned value:
  2768.   * eax = -1 - access to PCI is disabled; otherwise
  2769.   * al = number of the last PCI-bus; other bytes of eax are destroyed
  2770. Remarks:
  2771.   * Previously low-level access to PCI for applications must be
  2772.     enabled by subfunction 12 of function 21.
  2773.   * If PCI BIOS is not supported, the value of ax is undefined.
  2774.  
  2775. ---------------------- Constants for registers: ----------------------
  2776.   eax - SF_PCI (62)
  2777.   ebx - SSF_GET_LAST_BUS (1)
  2778. ======================================================================
  2779. ===================== Function 62, subfunction 2 =====================
  2780. ===== Get mechanism of addressing to the PCI configuration space. ====
  2781. ======================================================================
  2782. Parameters:
  2783.   * eax = 62 - function number
  2784.   * bl = 2 - subfunction number
  2785. Returned value:
  2786.   * eax = -1 - access to PCI is disabled; otherwise
  2787.   * al = mechanism (1 or 2); other bytes of eax are destroyed
  2788. Remarks:
  2789.   * Previously low-level access to PCI for applications must be
  2790.     enabled by subfunction 12 of function 21.
  2791.   * Addressing mechanism is selected depending on
  2792.     equipment characteristics.
  2793.   * Subfunctions of read and write work automatically
  2794.     with the selected mechanism.
  2795.  
  2796. ---------------------- Constants for registers: ----------------------
  2797.   eax - SF_PCI (62)
  2798.   ebx - SSF_GET_ADRR_MODE (2)
  2799. ======================================================================
  2800. ======== Function 62, subfunctions 4,5,6 - read PCI-register. ========
  2801. ======================================================================
  2802. Parameters:
  2803.   * eax = 62 - function number
  2804.   * bl = 4 - read byte
  2805.   * bl = 5 - read word
  2806.   * bl = 6 - read dword
  2807.   * bh = number of PCI-bus
  2808.   * ch = dddddfff, where ddddd = number of the device on the bus,
  2809.     fff = function number of device
  2810.   * cl = number of register (must be even for bl=5,
  2811.     divisible by 4 for bl=6)
  2812. Returned value:
  2813.   * eax = -1 - error (access to PCI is disabled or parameters
  2814.     are not supported); otherwise
  2815.   * al/ax/eax (depending on requested size) contains the data;
  2816.     the other part of register eax is destroyed
  2817. Remarks:
  2818.   * Previously low-level access to PCI for applications must be
  2819.     enabled by subfunction 12 of function 21.
  2820.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  2821.     function number. To get access mechanism use subfunction 2.
  2822.   * Some registers are standard and exist for all devices, some are
  2823.     defined by the concrete device. The list of registers of the
  2824.     first type can be found e.g. in famous
  2825.     Interrupt List by Ralf Brown
  2826.     (http://www.pobox.com/~ralf/files.html,
  2827.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/);
  2828.     registers of the second type must be listed
  2829.     in the device documentation.
  2830.  
  2831. ---------------------- Constants for registers: ----------------------
  2832.   eax - SF_PCI (62)
  2833.   ebx - SSF_READ_BYTE (4), SSF_READ_WORD (5), SSF_READ_DWORD (6)
  2834. ======================================================================
  2835. ====== Function 62, subfunctions 8,9,10 - write to PCI-register. =====
  2836. ======================================================================
  2837. Parameters:
  2838.   * eax = 62 - function number
  2839.   * bl = 8 - write byte
  2840.   * bl = 9 - write word
  2841.   * bl = 10 - write dword
  2842.   * bh = number of PCI-bus
  2843.   * ch = dddddfff, where ddddd = number of the device on the bus,
  2844.     fff = function number of device
  2845.   * cl = number of register (must be even for bl=9,
  2846.     divisible by 4 for bl=10)
  2847.   * dl/dx/edx (depending on requested size) contatins
  2848.     the data to write
  2849. Returned value:
  2850.   * eax = -1 - error (access to PCI is disabled or parameters
  2851.     are not supported)
  2852.   * eax = 0 - success
  2853. Remarks:
  2854.   * Previously low-level access to PCI for applications must be
  2855.     enabled by subfunction 12 of function 21.
  2856.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  2857.     function number. To get access mechanism use subfunction 2.
  2858.   * Some registers are standard and exist for all devices, some are
  2859.     defined by the concrete device. The list of registers of the
  2860.     first type can be found e.g. in famous Interrupt List by
  2861.     Ralf Brown; registers of the second type must be listed
  2862.     in the device documentation.
  2863.  
  2864. ---------------------- Constants for registers: ----------------------
  2865.   eax - SF_PCI (62)
  2866.   ebx - SSF_WRITE_BYTE (8), SSF_WRITE_WORD (9), SSF_WRITE_DWORD (10)
  2867. ======================================================================
  2868. ============== Function 63 - work with the debug board. ==============
  2869. ======================================================================
  2870. The debug board is the global system buffer (with the size
  2871. 1024 bytes), to which any program can write (generally speaking,
  2872. arbitrary) data and from which other program can read these data.
  2873. By the agreement written data are text strings interpreted as
  2874. debug messages on a course of program execution. The kernel in
  2875. some situations also writes to the debug board information on
  2876. execution of some functions; by the agreement kernel messages
  2877. begins from the prefix "K : ".
  2878. For view of the debug board the application 'board' was created,
  2879. which reads data from the buffer and displays them in its window.
  2880. 'board' interpretes the sequence of codes 13,10 as newline.
  2881. A character with null code in an end of line is not necessary,
  2882. but also does not prevent.
  2883. Because debugger has been written, the value of the debug board
  2884. has decreased, as debugger allows to inspect completely a course of
  2885. program execution without any efforts from the direction of program
  2886. itself. Nevertheless in some cases the debug board is still useful.
  2887.  
  2888. ----------------------------- Write byte -----------------------------
  2889. Parameters:
  2890.   * eax = 63 - function number
  2891.   * ebx = 1 - subfunction number
  2892.   * cl = data byte
  2893. Returned value:
  2894.   * function does not return value
  2895. Remarks:
  2896.   * Byte is written to the buffer. Buffer size is 512 bytes.
  2897.     At buffer overflow all obtained data are lost.
  2898.   * For output to the debug board of more complicated objects
  2899.     (strings, numbers) it is enough to call this function in cycle.
  2900.     It is possible not to write the appropriate code manually and use
  2901.     file 'debug.inc', which is included into the distributive.
  2902.  
  2903. ----------------------------- Read byte ------------------------------
  2904. Takes away byte from the buffer.
  2905. Parameters:
  2906.   * eax = 63 - function number
  2907.   * ebx = 2 - subfunction number
  2908. Returned value:
  2909.   * eax = ebx = 0 - the buffer is empty
  2910.   * eax = byte, ebx = 1 - byte was successfully read
  2911.  
  2912. ---------------------- Constants for registers: ----------------------
  2913.   eax - SF_BOARD (63)
  2914.   ebx - SSF_DEBUG_WRITE (1), SSF_DEBUG_READ (2)
  2915. ======================================================================
  2916. ============== Function 64 - resize application memory. ==============
  2917. ======================================================================
  2918. Parameters:
  2919.   * eax = 64 - function number
  2920.   * ebx = 1 - unique subfunction
  2921.   * ecx = new memory size
  2922. Returned value:
  2923.   * eax = 0 - success
  2924.   * eax = 1 - not enough memory
  2925. Remarks:
  2926.   * There is another way to dynamically allocate/free memory -
  2927.     subfunctions 11, 12, 13 of function 68.
  2928.   * The function cannot be used together with 68.11, 68.12, 68.13.
  2929.     The function call will be ignored after creation of process heap
  2930.     with function 68.11.
  2931.  
  2932. ---------------------- Constants for registers: ----------------------
  2933.   eax - SF_MEMORY_RESIZE (64)
  2934. ======================================================================
  2935. ======== Function 65 - draw image with palette in the window. ========
  2936. ======================================================================
  2937. Parameters:
  2938.   * eax = 65 - function number
  2939.   * ebx = pointer to the image
  2940.   * ecx = [size on axis x]*65536 + [size on axis y]
  2941.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  2942.   * esi = number of bits per pixel, must be 1,2,4,8,9,15,16,24 or 32;
  2943.   * edi = pointer to palette (2 to the power esi colors 0x00RRGGBB);
  2944.           ignored when esi > 8
  2945.   * ebp = offset of next row data relative to previous row data
  2946. Returned value:
  2947.   * function does not return value
  2948. Remarks:
  2949.   * Coordinates of the image are coordinates of the upper left corner
  2950.     of the image relative to the window.
  2951.   * Format of image with 1 bit per pixel: each byte of image
  2952.     (possibly excluding last bytes in rows), contains information on
  2953.     the color of 8 pixels, MSB corresponds to first pixel.
  2954.   * Format of image with 2 bits per pixel: each byte of image
  2955.     (possibly excluding last bytes in rows), contains information on
  2956.     the color of 4 pixels, two MSBs correspond to first pixel.
  2957.   * Format of image with 4 bits per pixel: each byte of image
  2958.     excluding last bytes in rows (if width is odd) contains
  2959.     information on the color of 2 pixels, high-order tetrad
  2960.     corresponds to first pixel.
  2961.   * Format of image with 8 bits per pixel: each byte of image is
  2962.     index in the palette.
  2963.   * Format of image with 9 bits per pixel: array of one byte values;
  2964.     each byte (8 bit) represents the intensity of gray for one pixel;
  2965.     this format is equal to 8bpp without palette.
  2966.   * Format of image with 15 bits per pixel: the color of each pixel
  2967.     is coded as (bit representation) 0RRRRRGGGGGBBBBB - 5 bits per
  2968.     each color.
  2969.   * Format of image with 16 bits per pixel: the color of each pixel
  2970.     is coded as RRRRRGGGGGGBBBBB (5+6+5).
  2971.   * Format of image with 24 bits per pixel: the color of each pixel
  2972.     is coded as 3 bytes - sequentially blue, green, red components.
  2973.   * Format of image with 32 bits per pixel: similar to 24, but
  2974.     one additional ignored byte is present.
  2975.   * The call to function 7 is equivalent to call to this function
  2976.     with esi=24, ebp=0.
  2977.  
  2978. ---------------------- Constants for registers: ----------------------
  2979.   eax - SF_PUT_IMAGE_EXT (65)
  2980. ======================================================================
  2981. ================== Function 66 - work with keyboard. =================
  2982. ======================================================================
  2983. The input mode influences results of reading keys by function 2.
  2984. When a program loads, ASCII input mode is set for it.
  2985.  
  2986. -------------- Subfunction 1 - set keyboard input mode. --------------
  2987. Parameters:
  2988.   * eax = 66 - function number
  2989.   * ebx = 1 - subfunction number
  2990.   * ecx = mode:
  2991.     * 0 = normal (ASCII-characters)
  2992.     * 1 = scancodes
  2993. Returned value:
  2994.   * function does not return value
  2995.  
  2996. -------------- Subfunction 2 - get keyboard input mode. --------------
  2997. Parameters:
  2998.   * eax = 66 - function number
  2999.   * ebx = 2 - subfunction number
  3000. Returned value:
  3001.   * eax = current mode
  3002.  
  3003. ------------ Subfunction 3 - get status of control keys. -------------
  3004. Parameters:
  3005.   * eax = 66 - function number
  3006.   * ebx = 3 - subfunction number
  3007. Returned value:
  3008.   * eax = bit mask:
  3009.   * bit 0  (mask 1): left Shift is pressed
  3010.   * bit 1  (mask 2): right Shift is pressed
  3011.   * bit 2  (mask 4): left Ctrl is pressed
  3012.   * bit 3  (mask 8): right Ctrl is pressed
  3013.   * bit 4  (mask 0x10): left Alt is pressed
  3014.   * bit 5  (mask 0x20): right Alt is pressed
  3015.   * bit 6  (mask 0x40): CapsLock is on
  3016.   * bit 7  (mask 0x80): NumLock is on
  3017.   * bit 8  (mask 0x100): ScrollLock is on
  3018.   * bit 9  (mask 0x200): left Win is pressed
  3019.   * bit 10 (mask 0x400): right Win is pressed
  3020.   * other bits are cleared
  3021.  
  3022. -------------- Subfunction 4 - set system-wide hotkey. ---------------
  3023. When hotkey is pressed, the system notifies only those applications,
  3024. which have installed it; the active application (which receives
  3025. all normal input) does not receive such keys.
  3026. The notification consists in sending event with the code 2.
  3027. Reading hotkey is the same as reading normal key - by function 2.
  3028. Parameters:
  3029.   * eax = 66 - function number
  3030.   * ebx = 4 - subfunction number
  3031.   * cl determines key scancode;
  3032.     use cl=0 to give combinations such as Ctrl+Shift
  3033.   * edx = 0xXYZ determines possible states of control keys:
  3034.     * Z (low 4 bits) determines state of LShift and RShift:
  3035.       * 0 = no key must be pressed;
  3036.       * 1 = exactly one key must be pressed;
  3037.       * 2 = both keys must be pressed;
  3038.       * 3 = must be pressed LShift, but not RShift;
  3039.       * 4 = must be pressed RShift, but not LShift
  3040.     * Y - similar for LCtrl and RCtrl;
  3041.     * X - similar for LAlt and RAlt
  3042. Returned value:
  3043.   * eax=0 - success
  3044.   * eax=1 - too mant hotkeys (maximum 256 are allowed)
  3045. Remarks:
  3046.   * Hotkey can work either at pressing or at release. Release
  3047.     scancode of a key is more on 128 than pressing scancode
  3048.     (i.e. high bit is set).
  3049.   * Several applications can set the same combination;
  3050.     all such applications will be informed on pressing
  3051.     such combination.
  3052.  
  3053. -------------- Subfunction 5 - delete installed hotkey. --------------
  3054. Parameters:
  3055.   * eax = 66 - function number
  3056.   * ebx = 5 - subfunction number
  3057.   * cl = scancode of key and edx = 0xXYZ the same as in subfunction 4
  3058. Returned value:
  3059.   * eax = 0 - success
  3060.   * eax = 1 - there is no such hotkey
  3061. Remarks:
  3062.   * When a process/thread terminates, all hotkey installed by it are
  3063.     deleted.
  3064.   * The call to this subfunction does not affect other applications.
  3065.     If other application has defined the same combination, it will
  3066.     still receive notices.
  3067.  
  3068. --------------- Subfunction 6 - block the normal input. --------------
  3069. Parameters:
  3070.   * eax = 66 - function number
  3071.   * ebx = 6 - subfunction number
  3072. Returned value:
  3073.   * function does not return value
  3074. Remarks:
  3075.   * Blocking the normal keyboard input for installed hotkeys
  3076.   * To emulate a mouse via the keyboard, the application MOUSEMUL
  3077.  
  3078. ------------ Subfunction 7 - unlock the normal input. ----------------
  3079. Parameters:
  3080.   * eax = 66 - function number
  3081.   * ebx = 7 - subfunction number
  3082. Returned value:
  3083.   * function does not return value
  3084. Remarks:
  3085.   * Unlocking the results of the f. 66.6
  3086.   * To emulate a mouse via the keyboard, the application MOUSEMUL
  3087.  
  3088. ---------------------- Constants for registers: ----------------------
  3089.   eax - SF_KEYBOARD (66)
  3090.   ebx - SSF_SET_INPUT_MODE (1), SSF_GET_INPUT_MODE (2),
  3091.     SSF_GET_CONTROL_KEYS (3), SSF_SET_SYS_HOTKEY (4),
  3092.     SSF_DEL_SYS_HOTKEY (5),  SSF_LOCK_INPUT (6), SSF_UNLOCK_INPUT (7)
  3093. ======================================================================
  3094. ========= Function 67 - change position/sizes of the window. =========
  3095. ======================================================================
  3096. Parameters:
  3097.   * eax = 67 - function number
  3098.   * ebx = new x-coordinate of the window
  3099.   * ecx = new y-coordinate of the window
  3100.   * edx = new x-size of the window
  3101.   * esi = new y-size of the window
  3102. Returned value:
  3103.   * function does not return value
  3104. Remarks:
  3105.   * The value -1 for a parameter means "do not change"; e.g. to move
  3106.     the window without resizing it is possible to specify edx=esi=-1.
  3107.   * Previously the window must be defined by function 0.
  3108.     It sets initial coordinates and sizes of the window.
  3109.   * Sizes of the window are understood in sense of function 0,
  3110.     that is one pixel less than real sizes.
  3111.   * The function call for maximized windows is simply ignored.
  3112.   * For windows of appropriate styles position and/or sizes can be
  3113.     changed by user; current position and sizes can be obtained by
  3114.     call to function 9.
  3115.   * The function sends to the window redraw event (with the code 1).
  3116.  
  3117. ---------------------- Constants for registers: ----------------------
  3118.   eax - SF_CHANGE_WINDOW (67)
  3119. ======================================================================
  3120. ====== Function 68, subfunction 0 - get the task switch counter. =====
  3121. ======================================================================
  3122. Parameters:
  3123.   * eax = 68 - function number
  3124.   * ebx = 0 - subfunction number
  3125. Returned value:
  3126.   * eax = number of task switches from the system booting
  3127.     (modulo 2^32)
  3128.  
  3129. ---------------------- Constants for registers: ----------------------
  3130.   eax - SF_SYS_MISC (68)
  3131.   ebx - SSF_GET_TASK_SWITCH_COUNT (0)
  3132. ======================================================================
  3133. ======= Function 68, subfunction 1 - switch to the next thread. ======
  3134. ======================================================================
  3135. The function completes the current time slice allocated to the
  3136. thread and switches to the next. (Which thread in which process
  3137. will be next, is unpredictable). Later, when execution queue
  3138. will reach the current thread, execution will be continued.
  3139. Parameters:
  3140.   * eax = 68 - function number
  3141.   * ebx = 1 - subfunction number
  3142. Returned value:
  3143.   * function does not return value
  3144.  
  3145. ---------------------- Constants for registers: ----------------------
  3146.   eax - SF_SYS_MISC (68)
  3147.   ebx - SSF_SWITCH_TASK (1)
  3148. ======================================================================
  3149. ============= Function 68, subfunction 2 - cache + rdpmc. ============
  3150. ======================================================================
  3151. Parameters:
  3152.   * eax = 68 - function number
  3153.   * ebx = 2 - subfunction number
  3154.   * ecx = required action:
  3155.     * ecx = 0 - enable instruction 'rdpmc'
  3156.       (ReaD Performance-Monitoring Counters) for applications
  3157.     * ecx = 1 - find out whether cache is disabled/enabled
  3158.     * ecx = 2 - enable cache
  3159.     * ecx = 3 - disable cache
  3160. Returned value:
  3161.   * for ecx=0:
  3162.     * eax = the value of cr4
  3163.   * for ecx=1:
  3164.     * eax = (cr0 and 0x60000000):
  3165.     * eax = 0 - cache is on
  3166.     * eax <> 0 - cache is off
  3167.   * for ecx=2 and ecx=3:
  3168.     * function does not return value
  3169.  
  3170. ---------------------- Constants for registers: ----------------------
  3171.   eax - SF_SYS_MISC (68)
  3172.   ebx - SSF_PERFORMANCE (2)
  3173.   ecx - SSSF_ALLOW_RDPMC (0), SSSF_CACHE_STATUS (1),
  3174.     SSSF_CACHE_ON (2), SSSF_CACHE_OFF (3)
  3175. ======================================================================
  3176. =========== Function 68, subfunction 3 - read MSR-register. ==========
  3177. ======================================================================
  3178. MSR = Model Specific Register; the complete list of MSR-registers
  3179. of a processor is included to the documentation on it (for example,
  3180. IA-32 Intel Architecture Software Developer's Manual,
  3181. Volume 3, Appendix B); each processor family has its own subset
  3182. of the MSR-registers.
  3183. Parameters:
  3184.   * eax = 68 - function number
  3185.   * ebx = 3 - subfunction number
  3186.   * ecx is ignored
  3187.   * edx = MSR address
  3188. Returned value:
  3189.   * ebx:eax = high:low dword of the result
  3190. Remarks:
  3191.   * If ecx contains nonexistent or not implemented for this processor
  3192.     MSR, processor will generate an exception in the kernel, which
  3193.     will kill the thread.
  3194.   * Previously it is necessary to check, whether MSRs are supported
  3195.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3196.     will generate other exception in the kernel, which will anyway
  3197.     kill the thread.
  3198.  
  3199. ---------------------- Constants for registers: ----------------------
  3200.   eax - SF_SYS_MISC (68)
  3201.   ebx - SSF_READ_MSR (3)
  3202. ======================================================================
  3203. ========= Function 68, subfunction 4 - write to MSR-register. ========
  3204. ======================================================================
  3205. MSR = Model Specific Register; the complete list of MSR-registers
  3206. of a processor is included to the documentation on it (for example,
  3207. IA-32 Intel Architecture Software Developer's Manual,
  3208. Volume 3, Appendix B); each processor family has its own subset
  3209. of the MSR-registers.
  3210. Parameters:
  3211.   * eax = 68 - function number
  3212.   * ebx = 4 - subfunction number
  3213.   * ecx is ignored
  3214.   * edx = MSR address
  3215.   * esi:edi = high:low dword
  3216. Returned value:
  3217.   * function does not return value
  3218. Remarks:
  3219.   * If ecx contains nonexistent or not implemented for this processor
  3220.     MSR, processor will generate an exception in the kernel, which
  3221.     will kill the thread.
  3222.   * Previously it is necessary to check, whether MSRs are supported
  3223.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3224.     will generate other exception in the kernel, which will anyway
  3225.     kill the thread.
  3226.  
  3227. ---------------------- Constants for registers: ----------------------
  3228.   eax - SF_SYS_MISC (68)
  3229.   ebx - SSF_WRITE_MSR (4)
  3230. ======================================================================
  3231. ======= Function 68, subfunction 11 - initialize process heap. =======
  3232. ======================================================================
  3233. Parameters:
  3234.   * eax = 68 - function number
  3235.   * ebx = 11 - subfunction number
  3236. Returned value:
  3237.   * eax = 0 - failed
  3238.   * otherwise size of created heap
  3239. Remarks:
  3240.   * The function call initializes heap, from which one can in future
  3241.     allocate and free memory blocks with subfunctions 12 and 13.
  3242.     Heap size is equal to total amount of free application memory.
  3243.   * The second function call from the same process results in
  3244.     returning the size of the existing heap.
  3245.   * After creation of the heap calls to function 64 will be ignored.
  3246.  
  3247. ---------------------- Constants for registers: ----------------------
  3248.   eax - SF_SYS_MISC (68)
  3249.   ebx - SSF_HEAP_INIT (11)
  3250. ======================================================================
  3251. ======== Function 68, subfunction 12 - allocate memory block. ========
  3252. ======================================================================
  3253. Parameters:
  3254.   * eax = 68 - function number
  3255.   * ebx = 12 - subfunction number
  3256.   * ecx = required size in bytes
  3257. Returned value:
  3258.   * eax = pointer to the allocated block
  3259. Remarks:
  3260.   * Before this call one must initialize process heap by call to
  3261.     subfunction 11.
  3262.   * The function allocates an integer number of pages (4 Kb) in such
  3263.     way that the real size of allocated block is more than or equal to
  3264.     requested size.
  3265.  
  3266. ---------------------- Constants for registers: ----------------------
  3267.   eax - SF_SYS_MISC (68)
  3268.   ebx - SSF_MEM_ALLOC (12)
  3269. ======================================================================
  3270. ========== Function 68, subfunction 13 - free memory block. ==========
  3271. ======================================================================
  3272. Parameters:
  3273.   * eax = 68 - function number
  3274.   * ebx = 13 - subfunction number
  3275.   * ecx = pointer to the memory block
  3276. Returned value:
  3277.   * eax = 1 - success
  3278.   * eax = 0 - failed
  3279. Remarks:
  3280.   * The memory block must have been allocated by subfunction 12
  3281.     or subfunction 20.
  3282.  
  3283. ---------------------- Constants for registers: ----------------------
  3284.   eax - SF_SYS_MISC (68)
  3285.   ebx - SSF_MEM_FREE (13)
  3286. ======================================================================
  3287. ===================== Function 68, subfunction 14 ====================
  3288. ============ Wait for signal from another program/driver. ============
  3289. ======================================================================
  3290. Parameters:
  3291.   * eax = 68 - function number
  3292.   * ebx = 14 - subfunction number
  3293.   * ecx = pointer to the buffer for information (24 bytes)
  3294. Returned value:
  3295.   * buffer pointed to by ecx contains the following information:
  3296.     * +0: dword: identifier for following data of signal
  3297.     * +4: dword: data of signal (20 bytes), format of which is defined
  3298.           by the first dword
  3299.  
  3300. ---------------------- Constants for registers: ----------------------
  3301.   eax - SF_SYS_MISC (68)
  3302.   ebx - SSF_WAIT_SIGNAL (14)
  3303. ======================================================================
  3304. ============= Function 68, subfunction 16 - load driver. =============
  3305. ======================================================================
  3306. Parameters:
  3307.   * eax = 68 - function number
  3308.   * ebx = 16 - subfunction number
  3309.   * ecx = pointer to ASCIIZ-string with driver name
  3310. Returned value:
  3311.   * eax = 0 - failed
  3312.   * otherwise eax = driver handle
  3313. Remarks:
  3314.   * If the driver was not loaded yet, it is loaded;
  3315.     if the driver was loaded yet, nothing happens.
  3316.   * Driver name is case-sensitive.
  3317.     Maximum length of the name is 16 characters, including
  3318.     terminating null character, the rest is ignored.
  3319.   * Driver ABC is loaded from file /rd/1/drivers/ABC.obj.
  3320.  
  3321. ---------------------- Constants for registers: ----------------------
  3322.   eax - SF_SYS_MISC (68)
  3323.   ebx - SSF_LOAD_DRIVER (16)
  3324. ======================================================================
  3325. ============ Function 68, subfunction 17 - driver control. ===========
  3326. ======================================================================
  3327. Parameters:
  3328.   * eax = 68 - function number
  3329.   * ebx = 17 - subfunction number
  3330.   * ecx = pointer to the control structure:
  3331.     * +0: dword: handle of driver
  3332.     * +4: dword: code of driver function
  3333.     * +8: dword: pointer to input data
  3334.     * +12 = +0xC: dword: size of input data
  3335.     * +16 = +0x10: dword: pointer to output data
  3336.     * +20 = +0x14: dword: size of output data
  3337. Returned value:
  3338.   * eax = determined by driver
  3339. Remarks:
  3340.   * Function codes and the structure of input/output data
  3341.     are defined by driver.
  3342.   * Previously one must obtain driver handle by subfunction 16.
  3343.  
  3344. ---------------------- Constants for registers: ----------------------
  3345.   eax - SF_SYS_MISC (68)
  3346.   ebx - SSF_CONTROL_DRIVER (17)
  3347. ======================================================================
  3348. =============== Function 68, subfunction 19 - load DLL. ==============
  3349. ======================================================================
  3350. Parameters:
  3351.   * eax = 68 - function number
  3352.   * ebx = 19 - subfunction number
  3353.   * ecx = pointer to ASCIIZ-string with the full path to DLL
  3354. Returned value:
  3355.   * eax = 0 - failed
  3356.   * otherwise eax = pointer to DLL export table
  3357. Remarks:
  3358.   * Export table is an array of structures of 2 dword's, terminated
  3359.     by zero. The first dword in structure points to function name,
  3360.     the second dword contains address of function.
  3361.  
  3362. ---------------------- Constants for registers: ----------------------
  3363.   eax - SF_SYS_MISC (68)
  3364.   ebx - SSF_LOAD_DLL (19)
  3365. ======================================================================
  3366. ======= Function 68, subfunction 20 - reallocate memory block. =======
  3367. ======================================================================
  3368. Parameters:
  3369.   * eax = 68 - function number
  3370.   * ebx = 20 - subfunction number
  3371.   * ecx = new size in bytes
  3372.   * edx = pointer to already allocated block
  3373. Returned value:
  3374.   * eax = pointer to the reallocated block, 0 = error
  3375. Remarks:
  3376.   * Before this call one must initialize process heap by call to
  3377.     subfunction 11.
  3378.   * The function allocates an integer number of pages (4 Kb) in such
  3379.     way that the real size of allocated block is more than or equal to
  3380.     requested size.
  3381.   * If edx=0, the function call is equivalent to memory allocation
  3382.     with subfunction 12. Otherwise the block at edx
  3383.     must be allocated earlier with subfunction 12 or this subfunction.
  3384.   * If ecx=0, the function frees memory block at edx and returns 0.
  3385.   * The contents of the block are unchanged up to the shorter of
  3386.     the new and old sizes.
  3387.  
  3388. ---------------------- Constants for registers: ----------------------
  3389.   eax - SF_SYS_MISC (68)
  3390.   ebx - SSF_MEM_REALLOC (20)
  3391. ======================================================================
  3392. =========== Function 68, subfunction 21 - load driver PE. ============
  3393. ======================================================================
  3394. Parameters:
  3395.   * eax = 68 - function number
  3396.   * ebx = 21 - subfunction number
  3397.   * ecx = pointer to ASCIIZ-string with driver name
  3398.   * edx = pointer to command line
  3399. Returned value:
  3400.   * eax = 0 - failed
  3401.   * otherwise eax = driver handle
  3402. Remarks:
  3403.   * If the driver was not loaded yet, it is loaded;
  3404.     if the driver was loaded yet, nothing happens.
  3405.  
  3406. ---------------------- Constants for registers: ----------------------
  3407.   eax - SF_SYS_MISC (68)
  3408.   ebx - SSF_LOAD_DRIVER_PE (21)
  3409. ======================================================================
  3410. ======== Function 68, subfunction 22 - open named memory area. =======
  3411. ======================================================================
  3412. Parameters:
  3413.   * eax = 68 - function number
  3414.   * ebx = 22 - subfunction number
  3415.   * ecx = area name. Maximum of 31 characters with terminating zero
  3416.   * edx = area size in bytes for SHM_CREATE and SHM_OPEN_ALWAYS
  3417.   * esi = flags for open and access:
  3418.     * SHM_OPEN        = 0x00 - open existing memory area. If an area
  3419.                           with such name does not exist, the function
  3420.                           will return error code 5.
  3421.     * SHM_OPEN_ALWAYS = 0x04 - open existing or create new
  3422.                           memory area.
  3423.     * SHM_CREATE      = 0x08 - create new memory area. If an area
  3424.                           with such name already exists, the function
  3425.                           will return error code 10.
  3426.     * SHM_READ        = 0x00 - only read access
  3427.     * SHM_WRITE       = 0x01 - read and write access
  3428. Returned value:
  3429.   * eax = pointer to memory area, 0 if error has occured
  3430.   * if new area is created (SHM_CREATE or SHM_OPEN_ALWAYS):
  3431.     edx = 0 - success, otherwise - error code
  3432.   * if existing area is opened (SHM_OPEN or SHM_OPEN_ALWAYS):
  3433.     edx = error code (if eax=0) or area size in bytes
  3434. Error codes:
  3435.   * E_NOTFOUND = 5
  3436.   * E_ACCESS = 10
  3437.   * E_NOMEM = 30
  3438.   * E_PARAM = 33
  3439. Remarks:
  3440.   * Before this call one must initialize process heap by call to
  3441.     subfunction 11.
  3442.   * If a new area is created, access flags set maximal rights
  3443.     for other processes. An attempt from other process to open
  3444.     with denied rights will fail with error code E_ACCESS.
  3445.   * The process which has created an area always has write access.
  3446.  
  3447. ---------------------- Constants for registers: ----------------------
  3448.   eax - SF_SYS_MISC (68)
  3449.   ebx - SSF_MEM_OPEN (22)
  3450. ======================================================================
  3451. ======= Function 68, subfunction 23 - close named memory area. =======
  3452. ======================================================================
  3453. Parameters:
  3454.   * eax = 68 - function number
  3455.   * ebx = 23 - subfunction number
  3456.   * ecx = area name. Maximum of 31 characters with terminating zero
  3457. Returned value:
  3458.   * eax destroyed
  3459. Remarks:
  3460.   * A memory area is physically freed (with deleting all data and
  3461.     freeing physical memory), when all threads which have opened
  3462.     this area will close it.
  3463.   * When thread is terminating, all opened by it areas are closed.
  3464.  
  3465. ---------------------- Constants for registers: ----------------------
  3466.   eax - SF_SYS_MISC (68)
  3467.   ebx - SSF_MEM_CLOSE (23)
  3468. ======================================================================
  3469. ======== Function 68, subfunction 24 - set exception handler. ========
  3470. ======================================================================
  3471. Parameters:
  3472.   * eax = 68 - function number
  3473.   * ebx = 24 - subfunction number
  3474.   * ecx = address of the new exception handler
  3475.   * edx = the mask of handled exceptions
  3476. Returned value:
  3477.   * eax = address of the old exception handler (0, if it was not set)
  3478.   * ebx = the old mask of handled exceptions
  3479. Remarks:
  3480.   * Bit number in mask of exceptions corresponds to exception number
  3481.     in CPU-specification (Intel-PC). For example, FPU exceptions have
  3482.     number 16 (#MF), and SSE exceptions - 19 (#XF).
  3483.   * The current implementation ignores the inquiry for hook of 7
  3484.     exception - the system handles #NM by its own.
  3485.   * The exception handler is called with exception number as first
  3486.     (and only) stack parameter. So, correct exit from the handler is
  3487.     RET 4. It returns to the instruction, that caused the exception,
  3488.     for faults, and to the next instruction for traps (see
  3489.     classification of exceptions in CPU specification).
  3490.   * When user handler receives control, the corresponding bit in
  3491.     the exception mask is cleared. Raising this exception
  3492.     in consequence leads to default handling, that is,
  3493.     terminating the application in absence of debugger or
  3494.     suspend with notification of debugger otherwise.
  3495.   * After user handler completes critical operations, it can set
  3496.     the corresponding bit in the exception mask with subfunction 25.
  3497.     Also user handler is responsible for clearing exceptions flags in
  3498.     FPU and/or SSE.
  3499.  
  3500. ---------------------- Constants for registers: ----------------------
  3501.   eax - SF_SYS_MISC (68)
  3502.   ebx - SSF_SET_EXCEPTION_HANDLER (24)
  3503. ======================================================================
  3504. ======== Function 68, subfunction 25 - set exception activity ========
  3505. ======================================================================
  3506. Parameters:
  3507.   * eax = 68 - function number
  3508.   * ebx = 25 - subfunction number
  3509.   * ecx = signal number
  3510.   * edx = value of activity (0/1)
  3511. Returned value:
  3512.   * eax = -1 - invalid signal number
  3513.   * otherwise eax = old value of activity for this signal (0/1)
  3514. Remarks:
  3515.   * In current implementation only mask for user excepton handler,
  3516.     which has been previously set by subfunction 24,
  3517.     is changed. Signal number corresponds to exception number.
  3518.  
  3519. ---------------------- Constants for registers: ----------------------
  3520.   eax - SF_SYS_MISC (68)
  3521.   ebx - SSF_SET_EXCEPTION_STATE (25)
  3522. ======================================================================
  3523. ====== Function 68, subfunction 26 - release memory pages ============
  3524. ======================================================================
  3525. Parameters:
  3526.   * eax = 68 - function number
  3527.   * ebx = 26 - subfunction number
  3528.   * ecx = pointer to the memory block, allocated by subfunction 12
  3529.   * edx = offset from the block beginnings
  3530.   * esi = the size of the region of memory to release, in bytes
  3531. Remarks:
  3532.   * function release range of pages from ecx+edx to ecx+edx+esi
  3533.     and set virtual memory into reserved state.
  3534.  
  3535. ---------------------- Constants for registers: ----------------------
  3536.   eax - SF_SYS_MISC (68)
  3537.   ebx - SSF_MEM_FREE_EXT (26)
  3538. ======================================================================
  3539. ========== Function 68, subfunction 27 - load file ===================
  3540. ======================================================================
  3541. Parameters:
  3542.   * eax = 68 - function number
  3543.   * ebx = 27 - subfunction number
  3544.   * ecx = pointer to ASCIIZ-string with the filename
  3545. Returned value:
  3546.   * eax = pointer to the loaded file, or zero
  3547.   * edx = size of the loaded file, or zero
  3548. Remarks:
  3549.   * function loads file and unpacks, if necessary
  3550.  
  3551. ---------------------- Constants for registers: ----------------------
  3552.   eax - SF_SYS_MISC (68)
  3553.   ebx - SSF_LOAD_FILE (27)
  3554. ======================================================================
  3555. ====================== Function 69 - debugging. ======================
  3556. ======================================================================
  3557. A process can load other process as debugged by set of corresponding
  3558. bit by call to subfunction 7 of function 70.
  3559. A process can have only one debugger; one process can debug some
  3560. others. The system notifies debugger on events occuring with
  3561. debugged process. Messages are written to the buffer defined by
  3562. subfunction 0.
  3563. Format of a message:
  3564.   * +0: dword: message code
  3565.   * +4: dword: PID of debugged process
  3566.   * +8: there can be additional data depending on message code
  3567. Message codes:
  3568.   * 1 = exception
  3569.     * in addition dword-number of the exception is given
  3570.     * process is suspended
  3571.   * 2 = process has terminated
  3572.     * comes at any termination: both through the system function -1,
  3573.       and at "murder" by any other process (including debugger itself)
  3574.   * 3 = debug exception int 1 = #DB
  3575.     * in addition dword-image of the register DR6 is given:
  3576.       * bits 0-3: condition of the corresponding breakpoint (set by
  3577.         subfunction 9) is satisfied
  3578.       * bit 14: exception has occured because of the trace mode
  3579.         (flag TF is set TF)
  3580.     * process is suspended
  3581. When debugger terminates, all debugged processes are killed.
  3582. If debugger does not want this, it must previously detach by
  3583. subfunction 3.
  3584.  
  3585. All subfunctions are applicable only to processes/threads started
  3586. from the current by function 70 with set debugging flag.
  3587. Debugging of multithreaded programs is not supported yet.
  3588. The full list of subfunctions:
  3589.   * subfunction 0 - define data area for debug messages
  3590.   * subfunction 1 - get contents of registers of debugged thread
  3591.   * subfunction 2 - set contents of registers of debugged thread
  3592.   * subfunction 3 - detach from debugged process
  3593.   * subfunction 4 - suspend debugged thread
  3594.   * subfunction 5 - resume debugged thread
  3595.   * subfunction 6 - read from the memory of debugged process
  3596.   * subfunction 7 - write to the memory of debugged process
  3597.   * subfunction 8 - terminate debugged thread
  3598.   * subfunction 9 - set/clear hardware breakpoint
  3599.  
  3600. ---------------------- Constants for registers: ----------------------
  3601.   eax - SF_DEBUG (69)
  3602.   ebx - SSF_SET_MESSAGE_AREA (0), SSF_GET_REGISTERS (1),
  3603.     SSF_SET_REGISTERS (2), SSF_DETACH (3), SSF_SUSPEND (4),
  3604.     SSF_RESUME (5), SSF_READ_MEMORY (6), SSF_WRITE_MEMORY (7),
  3605.     SSF_TERMINATE (8), SSF_DEFINE_BREAKPOINT (9)
  3606. ======================================================================
  3607. = Function 69, subfunction 0 - define data area fror debug messages. =
  3608. ======================================================================
  3609. Parameters:
  3610.   * eax = 69 - function number
  3611.   * ebx = 0 - subfunction number
  3612.   * ecx = pointer
  3613. Format of data area:
  3614.   * +0: dword: N = buffer size (not including this header)
  3615.   * +4: dword: occupied place
  3616.   * +8: N*byte: buffer
  3617. Returned value:
  3618.   * function does not return value
  3619. Remarks:
  3620.   * If the size field is negative, the buffer is considered locked
  3621.     and at arrival of new message the system will wait.
  3622.     For synchronization frame all work with the buffer by operations
  3623.     lock/unlock
  3624.         neg     [bufsize]
  3625.   * Data in the buffer are considered as array of items with variable
  3626.     length - messages. Format of a message is explained in
  3627.     general description.
  3628.  
  3629. ---------------------- Constants for registers: ----------------------
  3630.   eax - SF_DEBUG (69)
  3631.   ebx - SSF_SET_MESSAGE_AREA (0)
  3632. ======================================================================
  3633. ===================== Function 69, subfunction 1 =====================
  3634. ============ Get contents of registers of debugged thread. ===========
  3635. ======================================================================
  3636. Parameters:
  3637.   * eax = 69 - function number
  3638.   * ebx = 1 - subfunction number
  3639.   * ecx = thread identifier
  3640.   * edx = size of context structure, must be 0x28=40 bytes
  3641.   * esi = pointer to context structure
  3642. Returned value:
  3643.   * function does not return value
  3644. Format of context structure: (FPU is not supported yet)
  3645.   * +0: dword: eip
  3646.   * +4: dword: eflags
  3647.   * +8: dword: eax
  3648.   * +12 = +0xC: dword: ecx
  3649.   * +16 = +0x10: dword: edx
  3650.   * +20 = +0x14: dword: ebx
  3651.   * +24 = +0x18: dword: esp
  3652.   * +28 = +0x1C: dword: ebp
  3653.   * +32 = +0x20: dword: esi
  3654.   * +36 = +0x24: dword: edi
  3655. Remarks:
  3656.   * If the thread executes code of ring-0, the function returns
  3657.     contents of registers of ring-3.
  3658.   * Process must be loaded for debugging (as is shown in
  3659.     general description).
  3660.  
  3661. ---------------------- Constants for registers: ----------------------
  3662.   eax - SF_DEBUG (69)
  3663.   ebx - SSF_GET_REGISTERS (1)
  3664. ======================================================================
  3665. ===================== Function 69, subfunction 2 =====================
  3666. ============ Set contents of registers of debugged thread. ===========
  3667. ======================================================================
  3668. Parameters:
  3669.   * eax = 69 - function number
  3670.   * ebx = 2 - subfunction number
  3671.   * ecx = thread identifier
  3672.   * edx = size of context structure, must be 0x28=40 bytes
  3673. Returned value:
  3674.   * function does not return value
  3675. Format of context structure is shown in the description of
  3676. subfunction 1.
  3677. Remarks:
  3678.   * If the thread executes code of ring-0, the function returns
  3679.     contents of registers of ring-3.
  3680.   * Process must be loaded for debugging (as is shown in
  3681.     general description).
  3682.  
  3683. ---------------------- Constants for registers: ----------------------
  3684.   eax - SF_DEBUG (69)
  3685.   ebx - SSF_SET_REGISTERS (2)
  3686. ======================================================================
  3687. ===== Function 69, subfunction 3 - detach from debugged process. =====
  3688. ======================================================================
  3689. Parameters:
  3690.   * eax = 69 - function number
  3691.   * ebx = 3 - subfunction number
  3692.   * ecx = identifier
  3693. Returned value:
  3694.   * function does not return value
  3695. Remarks:
  3696.   * If the process was suspended, it resumes execution.
  3697.  
  3698. ---------------------- Constants for registers: ----------------------
  3699.   eax - SF_DEBUG (69)
  3700.   ebx - SSF_DETACH (3)
  3701. ======================================================================
  3702. ======== Function 69, subfunction 4 - suspend debugged thread. =======
  3703. ======================================================================
  3704. Parameters:
  3705.   * eax = 69 - function number
  3706.   * ebx = 4 - subfunction number
  3707.   * ecx = thread identifier
  3708. Returned value:
  3709.   * function does not return value
  3710. Remarks:
  3711.   * Process must be loaded for debugging (as is shown in
  3712.     general description).
  3713.  
  3714. ---------------------- Constants for registers: ----------------------
  3715.   eax - SF_DEBUG (69)
  3716.   ebx - SSF_SUSPEND (4)
  3717. ======================================================================
  3718. ======== Function 69, subfunction 5 - resume debugged thread. ========
  3719. ======================================================================
  3720. Parameters:
  3721.   * eax = 69 - function number
  3722.   * ebx = 5 - subfunction number
  3723.   * ecx = thread identifier
  3724. Returned value:
  3725.   * function does not return value
  3726. Remarks:
  3727.   * Process must be loaded for debugging (as is shown in
  3728.     general description).
  3729.  
  3730. ---------------------- Constants for registers: ----------------------
  3731.   eax - SF_DEBUG (69)
  3732.   ebx - SSF_RESUME (5)
  3733. ======================================================================
  3734. = Fucntion 69, subfunction 6 - read from memory of debugged process. =
  3735. ======================================================================
  3736. Parameters:
  3737.   * eax = 69 - function number
  3738.   * ebx = 6 - subfunction number
  3739.   * ecx = identifier
  3740.   * edx = number of bytes to read
  3741.   * esi = address in the memory of debugged process
  3742.   * edi = pointer to buffer for data
  3743. Returned value:
  3744.   * eax = -1 at an error (invalid PID or buffer)
  3745.   * otherwise eax = number of read bytes (possibly, 0,
  3746.     if esi is too large)
  3747. Remarks:
  3748.   * Process must be loaded for debugging (as is shown in
  3749.     general description).
  3750.  
  3751. ---------------------- Constants for registers: ----------------------
  3752.   eax - SF_DEBUG (69)
  3753.   ebx - SSF_READ_MEMORY (6)
  3754. ======================================================================
  3755. == Function 69, subfunction 7 - write to memory of debugged process. =
  3756. ======================================================================
  3757. Parameters:
  3758.   * eax = 69 - function number
  3759.   * ebx = 7 - subfunction number
  3760.   * ecx = identifier
  3761.   * edx = number of bytes to write
  3762.   * esi = address of memory in debugged process
  3763.   * edi = pointer to data
  3764. Returned value:
  3765.   * eax = -1 at an error (invalid PID or buffer)
  3766.   * otherwise eax = number of written bytes (possibly, 0,
  3767.     if esi is too large)
  3768. Remarks:
  3769.   * Process must be loaded for debugging (as is shown in
  3770.     general description).
  3771.  
  3772. ---------------------- Constants for registers: ----------------------
  3773.   eax - SF_DEBUG (69)
  3774.   ebx - SSF_WRITE_MEMORY (7)
  3775. ======================================================================
  3776. ======= Function 69, subfunction 8 - terminate debugged thread. ======
  3777. ======================================================================
  3778. Parameters:
  3779.   * eax = 69 - function number
  3780.   * ebx = 8 - subfunction number
  3781.   * ecx = identifier
  3782. Returned value:
  3783.   * function does not return value
  3784. Remarks:
  3785.   * Process must be loaded for debugging (as is shown in
  3786.     general description).
  3787.   * The function is similar to subfunction 2 of function 18
  3788.     with two differences: it requires first remark and
  3789.     accepts PID rather than slot number.
  3790.  
  3791. ---------------------- Constants for registers: ----------------------
  3792.   eax - SF_DEBUG (69)
  3793.   ebx - SSF_TERMINATE (8)
  3794. ======================================================================
  3795. ===== Function 69, subfunction 9 - set/clear hardware breakpoint. ====
  3796. ======================================================================
  3797. Parameters:
  3798.   * eax = 69 - function number
  3799.   * ebx = 9 - subfunction number
  3800.   * ecx = thread identifier
  3801.   * dl = index of breakpoint, from 0 to 3 inclusively
  3802.   * dh = flags:
  3803.     * if high bit is cleared - set breakpoint:
  3804.       * bits 0-1 - condition:
  3805.         * 00 = breakpoint on execution
  3806.         * 01 = breakpoint on read
  3807.         * 11 = breakpoint on read/write
  3808.       * bits 2-3 - length; for breakpoints on exception it must be
  3809.         00, otherwise one of
  3810.         * 00 = byte
  3811.         * 01 = word
  3812.         * 11 = dword
  3813.       * esi = breakpoint address; must be aligned according to
  3814.         the length (i.e. must be even for word breakpoints,
  3815.         divisible by 4 for dword)
  3816.     * if high bit is set - clear breakpoint
  3817. Returned value:
  3818.   * eax = 0 - success
  3819.   * eax = 1 - error in the input data
  3820.   * eax = 2 - (reserved, is never returned in the current
  3821.     implementation) a global breakpoint with that index is already set
  3822. Remarks:
  3823.   * Process must be loaded for debugging (as is shown in
  3824.     general description).
  3825.   * Hardware breakpoints are implemented through DRx-registers of
  3826.     the processor, all limitations results from this.
  3827.   * The function can reinstall the breakpoint, previously set
  3828.     by it (and it does not inform on this).
  3829.     Carry on the list of set breakpoints in the debugger.
  3830.   * Breakpoints generate debug exception #DB, on which the system
  3831.     notifies debugger.
  3832.   * Breakpoints on write and read/write act after
  3833.     execution of the caused it instruction.
  3834.  
  3835. ---------------------- Constants for registers: ----------------------
  3836.   eax - SF_DEBUG (69)
  3837.   ebx - SSF_DEFINE_BREAKPOINT (9)
  3838. ======================================================================
  3839. ==== Function 70 - work with file system with long names support. ====
  3840. ======================================================================
  3841. Parameters:
  3842.   * eax = 70
  3843.   * ebx = pointer to the information structure
  3844. Returned value:
  3845.   * eax = 0 - success; otherwise file system error code
  3846.   * some subfunctions return value in other registers too
  3847. General format of the information structure:
  3848.   * +0: dword: subfunction number
  3849.   * +4: dword: file offset
  3850.   * +8: dword: high dword of offset (must be 0) or flags field
  3851.   * +12 = +0xC: dword: size
  3852.   * +16 = +0x10: dword: pointer to data
  3853.   * +20 = +0x14: n db: ASCIIZ-string with the filename
  3854.     or
  3855.   * +20 = +0x14: db 0
  3856.   * +21 = +0x15: dd pointer to ASCIIZ-string with the filename
  3857. Specifications - in documentation on the appropriate subfunction.
  3858. Filename is case-insensitive. Russian letters must be written in
  3859. the encoding cp866 (DOS).
  3860. Format of filename:
  3861. /base/number/dir1/dir2/.../dirn/file,
  3862. where /base/number identifies device, on which file is located:
  3863. one of
  3864.   * /RD/1 = /RAMDISK/1 to access ramdisk
  3865.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  3866.     /FD/2 = /FLOPPYDISK/2 to access second one
  3867.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  3868.     IDE0 (Primary Master), IDE1 (Primary Slave),
  3869.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  3870.     x - partition number on the selected hard drive, varies from 1
  3871.     to 255 (on each hard drive the indexing starts from 1)
  3872.   * /CD0/1, /CD1/1, /CD2/1, /CD3/1 to access accordingly to
  3873.     CD on IDE0 (Primary Master), IDE1 (Primary Slave),
  3874.     IDE2 (Secondary Master), IDE3 (Secondary Slave)
  3875.   * /SYS means system folder; with the usual boot (from floppy)
  3876.     is equivalent to /RD/1
  3877. Examples:
  3878.   * '/rd/1/kernel.asm',0
  3879.   * '/HD0/1/kernel.asm',0
  3880.   * '/hd0/2/menuet/pics/tanzania.bmp',0
  3881.   * '/hd0/1/Program files/NameOfProgram/SomeFile.SomeExtension',0
  3882.   * '/sys/MySuperApp.ini',0
  3883. Also function supports relative names.  If the path begins not
  3884. with '/', it is considered relative to a current folder. To get or
  3885. set a current folder, use the function 30.
  3886.  
  3887. Available subfunctions:
  3888.   * subfunction 0 - read file
  3889.   * subfunction 1 - read folder
  3890.   * subfunction 2 - create/rewrite file
  3891.   * subfunction 3 - write to existing file
  3892.   * subfunction 4 - set file size
  3893.   * subfunction 5 - get attributes of file/folder
  3894.   * subfunction 6 - set attributes of file/folder
  3895.   * subfunction 7 - start application
  3896.   * subfunction 8 - delete file/folder
  3897.   * subfunction 9 - create folder
  3898. For CD-drives due to hardware limitations only subfunctions
  3899. 0,1,5 and 7 are available, other subfunctions return error
  3900. with code 2.
  3901. At the first call of subfunctions 0,1,5,7 to ATAPI devices
  3902. (CD and DVD) the manual control of tray is locked due to caching
  3903. drive data. Unlocking is made when subfunction 4 of function 24
  3904. is called for corresponding device.
  3905.  
  3906. ---------------------- Constants for registers: ----------------------
  3907.   eax - SF_FILE (70)
  3908.  [ebx] - SSF_READ_FILE (0), SSF_READ_FOLDER (1), SSF_CREATE_FILE (2),
  3909.     SSF_WRITE_FILE (3), SSF_SET_END (4), SSF_GET_INFO (5),
  3910.     SSF_SET_INFO (6), SSF_START_APP (7), SSF_DELETE (8),
  3911.     SSF_CREATE_FOLDER (9)
  3912. ======================================================================
  3913. === Function 70, subfunction 0 - read file with long names support. ==
  3914. ======================================================================
  3915. Parameters:
  3916.   * eax = 70 - function number
  3917.   * ebx = pointer to the information structure
  3918. Format of the information structure:
  3919.   * +0: dword: 0 = subfunction number
  3920.   * +4: dword: file offset (in bytes)
  3921.   * +8: dword: 0 (reserved for high dword of offset)
  3922.   * +12 = +0xC: dword: number of bytes to read
  3923.   * +16 = +0x10: dword: pointer to buffer for data
  3924.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  3925.     given in the general description
  3926.     or
  3927.   * +20 = +0x14: db 0
  3928.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  3929. Returned value:
  3930.   * eax = 0 - success, otherwise file system error code
  3931.   * ebx = number of read bytes or -1=0xffffffff if file was not found
  3932. Remarks:
  3933.   * If file was ended before last requested block was read,
  3934.     the function will read as many as it can, and after that return
  3935.     eax=6 (EOF).
  3936.   * The function does not allow to read folder (returns eax=10,
  3937.     access denied).
  3938.  
  3939. ---------------------- Constants for registers: ----------------------
  3940.   eax - SF_FILE (70)
  3941.  [ebx] - SSF_READ_FILE (0)
  3942. ======================================================================
  3943. == Function 70, subfunction 1 - read folder with long names support. =
  3944. ======================================================================
  3945. Parameters:
  3946.   * eax = 70 - function number
  3947.   * ebx = pointer to the information structure
  3948. Format of the information structure:
  3949.   * +0: dword: 1 = subfunction number
  3950.   * +4: dword: index of starting block (beginning from 0)
  3951.   * +8: dword: flags field:
  3952.     * bit 0 (mask 1): in what format to return names,
  3953.       0=ANSI, 1=UNICODE
  3954.     * other bits are reserved and must be set to 0 for the future
  3955.       compatibility
  3956.   * +12 = +0xC: dword: number of blocks to read
  3957.   * +16 = +0x10: dword: pointer to buffer for data, buffer size
  3958.     must be not less than 32 + [+12]*560 bytes
  3959.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  3960.     given in the general description
  3961.     or
  3962.   * +20 = +0x14: db 0
  3963.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  3964. Returned value:
  3965.   * eax = 0 - success, otherwise file system error code
  3966.   * ebx = number of files, information on which was written to
  3967.     the buffer, or -1=0xffffffff, if folder was not found
  3968. Structure of the buffer:
  3969.   * +0: 32*byte: header
  3970.   * +32 = +0x20: n1*byte: block with information on file 1
  3971.   * +32+n1: n2*byte: block with information on file 2
  3972.   * ...
  3973. Structure of header:
  3974.   * +0: dword: version of structure (current is 1)
  3975.   * +4: dword: number of placed blocks; is not greater than requested
  3976.     in the field +12 of information structure; can be less, if
  3977.     there are no more files in folder (the same as in ebx)
  3978.   * +8: dword: total number of files in folder
  3979.   * +12 = +0xC: 20*byte: reserved (zeroed)
  3980. Structure of block of data for folder entry (BDFE):
  3981.   * +0: dword: attributes of file:
  3982.     * bit 0 (mask 1): file is read-only
  3983.     * bit 1 (mask 2): file is hidden
  3984.     * bit 2 (mask 4): file is system
  3985.     * bit 3 (mask 8): this is not a file but volume label
  3986.       (for one partition meets no more than once and
  3987.       only in root folder)
  3988.     * bit 4 (mask 0x10): this is a folder
  3989.     * bit 5 (mask 0x20): file was not archived - many archivation
  3990.       programs have an option to archive only files with this bit set,
  3991.       and after archiving this bit is cleared - it can be useful
  3992.       for automatically creating of backup-archives as at writing
  3993.       this bit is usually set
  3994.   * +4: byte: type of name data:
  3995.     (coincides with bit 0 of flags in the information structure)
  3996.     * 0 = ASCII = 1-byte representation of each character
  3997.     * 1 = UNICODE = 2-byte representation of each character
  3998.   * +5: 3*byte: reserved (zero)
  3999.   * +8: 4*byte: time of file creation
  4000.   * +12 = +0xC: 4*byte: date of file creation
  4001.   * +16 = +0x10: 4*byte: time of last access (read or write)
  4002.   * +20 = +0x14: 4*byte: date of last access
  4003.   * +24 = +0x18: 4*byte: time of last modification
  4004.   * +28 = +0x1C: 4*byte: date of last modification
  4005.   * +32 = +0x20: qword: file size in bytes (up to 16777216 Tb)
  4006.   * +40 = +0x28: name
  4007.     * for ASCII format: maximum length is 263 characters
  4008.       (263 bytes), byte after the name has value 0
  4009.     * for UNICODE format: maximum length is 259 characters
  4010.       (518 bytes), 2 bytes after the name have value 0
  4011. Time format:
  4012.   * +0: byte: seconds
  4013.   * +1: byte: minutes
  4014.   * +2: byte: hours
  4015.   * +3: byte: reserved (0)
  4016.   * for example, 23.59.59 is written as (in hex) 3B 3B 17 00
  4017. Date format:
  4018.   * +0: byte: day
  4019.   * +1: byte: month
  4020.   * +2: word: year
  4021.   * for example, 25.11.1979 is written as (in hex) 19 0B BB 07
  4022. Remarks:
  4023.   * If BDFE contains ASCII name, the length of BDFE is 304 bytes,
  4024.     if UNICODE name - 560 bytes. Value of length is aligned
  4025.     on 16-byte bound (to accelerate processing in CPU cache).
  4026.   * First character after a name is zero (ASCIIZ-string). The further
  4027.     data contain garbage.
  4028.   * If files in folder were ended before requested number was read,
  4029.     the function will read as many as it can, and after that return
  4030.     eax=6 (EOF).
  4031.   * Any folder on the disk, except for root, contains two special
  4032.     entries "." and "..", identifying accordingly the folder itself
  4033.     and the parent folder.
  4034.   * The function allows also to read virtual folders "/", "/rd",
  4035.     "/fd", "/hd[n]", thus attributes of subfolders are set to 0x10,
  4036.     and times and dates are zeroed. An alternative way to get the
  4037.     equipment information - subfunction 11 of function 18.
  4038.  
  4039. ---------------------- Constants for registers: ----------------------
  4040.   eax - SF_FILE (70)
  4041.  [ebx] - SSF_READ_FOLDER (1)
  4042. ======================================================================
  4043. ===================== Function 70, subfunction 2 =====================
  4044. ============ Create/rewrite file with long names support. ============
  4045. ======================================================================
  4046. Parameters:
  4047.   * eax = 70 - function number
  4048.   * ebx = pointer to the information structure
  4049. Format of the information structure:
  4050.   * +0: dword: 2 = subfunction number
  4051.   * +4: dword: 0 (reserved)
  4052.   * +8: dword: 0 (reserved)
  4053.   * +12 = +0xC: dword: number of bytes to write
  4054.   * +16 = +0x10: dword: pointer to data
  4055.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4056.     given in the general description
  4057.     or
  4058.   * +20 = +0x14: db 0
  4059.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4060. Returned value:
  4061.   * eax = 0 - success, otherwise file system error code
  4062.   * ebx = number of written bytes (possibly 0)
  4063. Remarks:
  4064.   * If a file with given name did not exist, it is created;
  4065.     if it existed, it is rewritten.
  4066.   * If there is not enough free space on disk, the function will
  4067.     write as many as can and then return error code 8.
  4068.   * The function is not supported for CD (returns error code 2).
  4069.  
  4070. ---------------------- Constants for registers: ----------------------
  4071.   eax - SF_FILE (70)
  4072.  [ebx] - SSF_CREATE_FILE (2)
  4073. ======================================================================
  4074. ===================== Function 70, subfunction 3 =====================
  4075. =========== Write to existing file with long names support. ==========
  4076. ======================================================================
  4077. Parameters:
  4078.   * eax = 70 - function number
  4079.   * ebx = pointer to the information structure
  4080. Format of the information structure:
  4081.   * +0: dword: 3 = subfunction number
  4082.   * +4: dword: file offset (in bytes)
  4083.   * +8: dword: high dword of offset (must be 0 for FAT)
  4084.   * +12 = +0xC: dword: number of bytes to write
  4085.   * +16 = +0x10: dword: pointer to data
  4086.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4087.     given in the general description
  4088.     or
  4089.   * +20 = +0x14: db 0
  4090.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4091. Returned value:
  4092.   * eax = 0 - success, otherwise file system error code
  4093.   * ebx = number of written bytes (possibly 0)
  4094. Remarks:
  4095.   * The file must already exist, otherwise function returns eax=5.
  4096.   * The only result of write 0 bytes is update in the file attributes
  4097.     date/time of modification and access to the current date/time.
  4098.   * If beginning and/or ending position is greater than file size
  4099.     (except for the previous case), the file is expanded to needed
  4100.     size with zero characters.
  4101.   * The function is not supported for CD (returns error code 2).
  4102.  
  4103. ---------------------- Constants for registers: ----------------------
  4104.   eax - SF_FILE (70)
  4105.  [ebx] - SSF_WRITE_FILE (3)
  4106. ======================================================================
  4107. ============ Function 70, subfunction 4 - set end of file. ===========
  4108. ======================================================================
  4109. Parameters:
  4110.   * eax = 70 - function number
  4111.   * ebx = pointer to the information structure
  4112. Format of the information structure:
  4113.   * +0: dword: 4 = subfunction number
  4114.   * +4: dword: low dword of new file size
  4115.   * +8: dword: high dword of new file size (must be 0 for FAT)
  4116.   * +12 = +0xC: dword: 0 (reserved)
  4117.   * +16 = +0x10: dword: 0 (reserved)
  4118.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4119.     given in the general description
  4120.     or
  4121.   * +20 = +0x14: db 0
  4122.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4123. Returned value:
  4124.   * eax = 0 - success, otherwise file system error code
  4125.   * ebx destroyed
  4126. Remarks:
  4127.   * If the new file size is less than old one, file is truncated.
  4128.     If the new size is greater than old one, file is expanded with
  4129.     characters with code 0. If the new size is equal to old one,
  4130.     the only result of call is set date/time of modification and
  4131.     access to the current date/time.
  4132.   * If there is not enough free space on disk for expansion, the
  4133.     function will expand to maximum possible size and then return
  4134.     error code 8.
  4135.   * The function is not supported for CD (returns error code 2).
  4136.  
  4137. ---------------------- Constants for registers: ----------------------
  4138.   eax - SF_FILE (70)
  4139.  [ebx] - SSF_SET_END (4)
  4140. ======================================================================
  4141. ==== Function 70, subfunction 5 - get information on file/folder. ====
  4142. ======================================================================
  4143. Parameters:
  4144.   * eax = 70 - function number
  4145.   * ebx = pointer to the information structure
  4146. Format of the information structure:
  4147.   * +0: dword: 5 = subfunction number
  4148.   * +4: dword: 0 (reserved)
  4149.   * +8: dword: 0 (reserved)
  4150.   * +12 = +0xC: dword: 0 (reserved)
  4151.   * +16 = +0x10: dword: pointer to buffer for data (40 bytes)
  4152.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4153.     given in the general description
  4154.     or
  4155.   * +20 = +0x14: db 0
  4156.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4157. Returned value:
  4158.   * eax = 0 - success, otherwise file system error code
  4159.   * ebx destroyed
  4160. Information on file is returned in the BDFE format (block of data
  4161. for folder entry), explained in the description of
  4162. subfunction 1, but without filename
  4163. (i.e. only first 40 = 0x28 bytes).
  4164. Remarks:
  4165.   * The function does not support virtual folders such as /, /rd and
  4166.     root folders like /rd/1.
  4167.  
  4168. ---------------------- Constants for registers: ----------------------
  4169.   eax - SF_FILE (70)
  4170.  [ebx] - SSF_GET_INFO (5)
  4171. ======================================================================
  4172. ===== Function 70, subfunction 6 - set attributes of file/folder. ====
  4173. ======================================================================
  4174. Parameters:
  4175.   * eax = 70 - function number
  4176.   * ebx = pointer to the information structure
  4177. Format of the information structure:
  4178.   * +0: dword: 6 = subfunction number
  4179.   * +4: dword: 0 (reserved)
  4180.   * +8: dword: 0 (reserved)
  4181.   * +12 = +0xC: dword: 0 (reserved)
  4182.   * +16 = +0x10: dword: pointer to buffer with attributes (32 bytes)
  4183.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4184.     given in the general description
  4185.     or
  4186.   * +20 = +0x14: db 0
  4187.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4188. Returned value:
  4189.   * eax = 0 - success, otherwise file system error code
  4190.   * ebx destroyed
  4191. File attributes are first 32 bytes in BDFE (block of data
  4192. for folder entry), explained in the description of subfunction 1
  4193. (that is, without name and size of file). Attribute
  4194. file/folder/volume label (bits 3,4 in dword +0) is not changed.
  4195. Byte +4 (name format) is ignored.
  4196. Remarks:
  4197.   * The function does not support virtual folders such as /, /rd and
  4198.     root folders like /rd/1.
  4199.   * The function is not supported for CD (returns error code 2).
  4200.  
  4201. ---------------------- Constants for registers: ----------------------
  4202.   eax - SF_FILE (70)
  4203.  [ebx] - SSF_SET_INFO (6)
  4204. ======================================================================
  4205. =========== Function 70, subfunction 7 - start application. ==========
  4206. ======================================================================
  4207. Parameters:
  4208.   * eax = 70 - function number
  4209.   * ebx = pointer to the information structure
  4210. Format of the information structure:
  4211.   * +0: dword: 7 = subfunction number
  4212.   * +4: dword: flags field:
  4213.     * bit 0: start process as debugged
  4214.     * other bits are reserved and must be set to 0
  4215.   * +8: dword: 0 or pointer to ASCIIZ-string with parameters
  4216.   * +12 = +0xC: dword: 0 (reserved)
  4217.   * +16 = +0x10: dword: 0 (reserved)
  4218.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4219.     given in the general description
  4220.     or
  4221.   * +20 = +0x14: db 0
  4222.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4223. Returned value:
  4224.   * eax > 0 - program is loaded, eax contains PID
  4225.   * eax < 0 - an error has occured, -eax contains
  4226.     file system error code
  4227.   * ebx destroyed
  4228. Remarks:
  4229.   * Command line must be terminated by the character with the code 0
  4230.     (ASCIIZ-string); function takes into account either all characters
  4231.     up to terminating zero inclusively or first 256 character
  4232.     regarding what is less.
  4233.   * If the process is started as debugged, it is created in
  4234.     the suspended state; to run use subfunction 5 of function 69.
  4235.  
  4236. ---------------------- Constants for registers: ----------------------
  4237.   eax - SF_FILE (70)
  4238.  [ebx] - SSF_START_APP (7)
  4239. ======================================================================
  4240. ========== Function 70, subfunction 8 - delete file/folder. ==========
  4241. ======================================================================
  4242. Parameters:
  4243.   * eax = 70 - function number
  4244.   * ebx = pointer to the information structure
  4245. Format of the information structure:
  4246.   * +0: dword: 8 = subfunction number
  4247.   * +4: dword: 0 (reserved)
  4248.   * +8: dword: 0 (reserved)
  4249.   * +12 = +0xC: dword: 0 (reserved)
  4250.   * +16 = +0x10: dword: 0 (reserved)
  4251.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4252.     given in the general description
  4253.     or
  4254.   * +20 = +0x14: db 0
  4255.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4256. Returned value:
  4257.   * eax = 0 - success, otherwise file system error code
  4258.   * ebx destroyed
  4259. Remarks:
  4260.   * The function is not supported for CD (returns error code 2).
  4261.   * The function can delete only empty folders (attempt to delete
  4262.     nonempty folder results in error with code 10, "access denied").
  4263.  
  4264. ---------------------- Constants for registers: ----------------------
  4265.   eax - SF_FILE (70)
  4266.  [ebx] - SSF_DELETE (8)
  4267. ======================================================================
  4268. ============= Function 70, subfunction 9 - create folder. ============
  4269. ======================================================================
  4270. Parameters:
  4271.   * eax = 70 - function number
  4272.   * ebx = pointer to the information structure
  4273. Format of the information structure:
  4274.   * +0: dword: 9 = subfunction number
  4275.   * +4: dword: 0 (reserved)
  4276.   * +8: dword: 0 (reserved)
  4277.   * +12 = +0xC: dword: 0 (reserved)
  4278.   * +16 = +0x10: dword: 0 (reserved)
  4279.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  4280.     given in the general description
  4281.     or
  4282.   * +20 = +0x14: db 0
  4283.   * +21 = +0x15: dd pointer to ASCIIZ-string with folder name
  4284. Returned value:
  4285.   * eax = 0 - success, otherwise file system error code
  4286.   * ebx destroyed
  4287. Remarks:
  4288.   * The function is not supported for CD (returns error code 2).
  4289.   * The parent folder must already exist.
  4290.   * If target folder already exists, function returns success (eax=0).
  4291.  
  4292. ---------------------- Constants for registers: ----------------------
  4293.   eax - SF_FILE (70)
  4294.  [ebx] - SSF_CREATE_FOLDER (9)
  4295. ======================================================================
  4296. ========== Function 71, subfunction 1 - set window caption. ==========
  4297. ======================================================================
  4298. Parameters:
  4299.   * eax = 71 - function number
  4300.   * ebx = 1 - subfunction number
  4301.   * ecx = pointer to zero terminated string
  4302. Returned value:
  4303.   * function does not return value
  4304. Remarks:
  4305.   * You may set the caption string encoding by putting
  4306.     at the start of the string a byte with next values:
  4307.     1 = cp866
  4308.     2 = UTF-16LE
  4309.     3 = UTF-8
  4310.     otherwise will be used cp866.
  4311.   * Pass NULL in ecx to remove caption.
  4312.  
  4313. ---------------------- Constants for registers: ----------------------
  4314.   eax - SF_SET_CAPTION (71)
  4315. ======================================================================
  4316. =============== Function 72 - send message to a window. ==============
  4317. ======================================================================
  4318.  
  4319. - Subfunction 1 - send message with parameter to the active window. --
  4320. Parameters:
  4321.   * eax = 72 - function number
  4322.   * ebx = 1 - subfunction number
  4323.   * ecx = event code: 2 or 3
  4324.   * edx = parameter: key code for ecx=2, button identifier for ecx=3
  4325. Returned value:
  4326.   * eax = 0 - success
  4327.   * eax = 1 - buffer is full
  4328.  
  4329. ---------------------- Constants for registers: ----------------------
  4330.   eax - SF_SEND_MESSAGE (72)
  4331. ======================================================================
  4332. ===================== Function 73 - blit bitmap  =====================
  4333. ======================================================================
  4334.  
  4335. Parameters:
  4336.   * eax = 73 - function number
  4337.  
  4338.   * ebx = ROP and optional flags
  4339.      31           6 5  4 3   0
  4340.      [  reserved  ][T][B][ROP]
  4341.      ROP - raster operation code
  4342.         0: Copy
  4343.      1-15: reserved
  4344.      B   - blit into the background surface
  4345.      T   - transparent blit
  4346.  
  4347.   * ecx = pointer to the function parameters
  4348.         destination offset and clipping
  4349.      +0 signed dword: destination rectangle X offset from the window
  4350.                       top-left corner
  4351.      +4 signed dword: destination rectangle Y offset from the window
  4352.                       top-left corner
  4353.      +8 dword:        destination rectangle width
  4354.     +12 dword:        destination rectangle height
  4355.  
  4356.         source offset and clipping
  4357.     +16 signed dword: source rectangle X offset from the bitmap
  4358.                       top-left corner
  4359.     +20 signed dword: source rectangle Y offset from the bitmap
  4360.                       top-left corner
  4361.     +24 dword:        source rectangle width
  4362.     +28 dword:        source rectangle height
  4363.  
  4364.     +32: dword: bitmap data - must be 32bpp
  4365.     +36: dword: size of the bitmap row in bytes
  4366.  
  4367. Returned value:
  4368.   * function does not return value
  4369.  
  4370. ---------------------- Constants for registers: ----------------------
  4371.   eax - SF_BLITTER (73)
  4372. ======================================================================
  4373. = Function 74, Subfunction 255, Get number of active network devices. =
  4374. ======================================================================
  4375. Parameters:
  4376.   * eax = 74 - function number
  4377.   * bl = 255 - subfunction number
  4378. Returned value:
  4379.   * eax = number of active network devices