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  1. SYSTEM FUNCTIONS of OS Kolibri 0.5.8.1
  2.  
  3. Number of the function is located in the register eax.
  4. The call of the system function is executed by "int 0x40" command.
  5. All registers except explicitly declared in the returned value,
  6.     including eflags, are preserved.
  7.  
  8.  
  9. ======================================================================
  10. ============== Function 0 - define and draw the window. ==============
  11. ======================================================================
  12. Defines an application window. Draws a frame of the window, header and
  13. working area. For windows with skin defines standard buttons for close
  14. and minimize.
  15. Parameters:
  16.   * eax = 0 - function number
  17.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  18.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  19.   * edx = 0xXYRRGGBB, where:
  20.     * Y = style of the window:
  21.       * Y=0 - type I - window of the fixed size
  22.       * Y=1 - only define window area, draw nothing
  23.       * Y=2 - type II - window of the variable size
  24.       * Y=3 - window with skin
  25.       * other possible values (from 4 up to 15) are reserved,
  26.         function call with such Y is ignored
  27.     * RR, GG, BB = accordingly red, green, blue components of a color
  28.       of the working area of the window (are ignored for style Y=2)
  29.     * X = DCBA (bits)
  30.       * A = 1 - window has caption; for style Y=3 caption string
  31.                   must be passed in edi, for other styles use
  32.                   subfunction 1 of function 71
  33.       * B = 1 - coordinates of all graphics primitives are relative to
  34.                   window client area
  35.       * C is reserved (set to 0)
  36.       * D = 0 - normal filling of the working area, 1 - gradient
  37.     The following parameters are intended for windows
  38.     of a type I and II, and ignored for styles Y=1,3:
  39.   * esi = 0xXYRRGGBB - color of the header
  40.     * RR, GG, BB define color
  41.     * Y=0 - usual window, Y=1 - unmovable window
  42.     * X defines a gradient of header: X=0 - no gradient,
  43.       X=8 - usual gradient,
  44.       for windows of a type II X=4 - negative gradient
  45.     * other values of X and Y are reserved
  46.   * edi = 0x00RRGGBB - color of the frame
  47. Returned value:
  48.   * function does not return value
  49. Remarks:
  50.   * Position and sizes of the window are installed by the first
  51.     call of this function and are ignored at subsequent; to change
  52.     position and/or sizes of already created window use function 67.
  53.   * For windows with style Y=3 and caption (A=1) caption string is set
  54.     by the first call of this function and is ignored at subsequent
  55.     (strictly speaking, is ignored after a call to subfunction 2
  56.     of function 12 - end redraw); to change caption of already created
  57.     window use subfunction 1 of function 71.
  58.   * If the window has appropriate styles, position and/or sizes can be
  59.     changed by user. Current position and sizes can be obtained
  60.     by function 9.
  61.   * The window must fit on the screen. If the transferred
  62.     coordinates and sizes do not satisfy to this condition,
  63.     appropriate coordinate (or, probably, both) is considered as zero,
  64.     and if also it does not help, the appropriate size
  65.     (or, probably, both) is installed in a size of the screen.
  66.    
  67.     Further we shall designate xpos,ypos,xsize,ysize - values
  68.     transmitted in ebx,ecx. The coordinates are resulted concerning
  69.     the left upper corner of the window, which, thus, is set as (0,0),
  70.     coordinates of the right lower corner essence (xsize,ysize).
  71.   * The sizes of the window are understood in sence of coordinates
  72.     of the right lower corner. This concerns all other functions too.
  73.     It means, that the real sizes are on 1 pixel more.
  74.   * The window of type I looks as follows:
  75.     * draw external frame of color indicated in edi, 1 pixel in width
  76.     * draw header - rectangle with the left upper corner (1,1) and
  77.       right lower (xsize-1,min(25,ysize)) color indicated in esi
  78.       (taking a gradient into account)
  79.     * if ysize>=26, fill the working area of the window -
  80.       rectangle with the left upper corner (1,21) and right lower
  81.       (xsize-1,ysize-1) (sizes (xsize-1)*(ysize-21)) with color
  82.       indicated in edx (taking a gradient into account)
  83.     * if A=1 and caption has been already set by subfunction 1
  84.       of function 71, it is drawn in the corresponding place of header
  85.   * The window of style Y=1 looks as follows:
  86.     * completely defined by the application
  87.   * The window of type II looks as follows:
  88.     * draw external frame of width 1 pixel with the "shaded" color
  89.       edi (all components of the color decrease twice)
  90.     * draw intermediate frame of width 3 pixels with color edi
  91.     * draw internal frame of width 1 pixel with the "shaded" color edi
  92.     * draw header - rectangle with the left upper corner (4,4)
  93.       and right lower (xsize-4,min(20,ysize)) color, indicated in esi
  94.       (taking a gradient into account)
  95.     * if ysize>=26, fill the working area of the window -
  96.       rectangle with the left upper corner (5,20) and right lower
  97.       (xsize-5,ysize-5) with color indicated in edx
  98.       (taking a gradient into account)
  99.     * if A=1 and caption has been already set by subfunction 1
  100.       of function 71, it is drawn in the corresponding place of header
  101.   * The skinned window looks as follows:
  102.     * draw external frame of width 1 pixel
  103.       with color 'outer' from the skin
  104.     * draw intermediate frame of width 3 pixel
  105.       with color 'frame' from the skin
  106.     * draw internal frame of width 1 pixel
  107.       with color 'inner' from the skin
  108.     * draw header (on bitmaps from the skin) in a rectangle
  109.       (0,0) - (xsize,_skinh-1)
  110.     * if ysize>=26, fill the working area of the window -
  111.       rectangle with the left upper corner (5,_skinh) and right lower
  112.       (xsize-5,ysize-5) with color indicated in edx
  113.       (taking a gradient into account)
  114.     * define two standard buttons: for close and minimize
  115.       (see function 8)
  116.     * if A=1 and edi contains (nonzero) pointer to caption string,
  117.       it is drawn in place in header defined in the skin
  118.     * value _skinh is accessible as the result of call
  119.       subfunction 4 of function 48
  120.  
  121. ======================================================================
  122. ================ Function 1 - put pixel in the window. ===============
  123. ======================================================================
  124. Parameters:
  125.   * eax = 1 - function number
  126.   * ebx = x-coordinate (relative to the window)
  127.   * ecx = y-coordinate (relative to the window)
  128.   * edx = 0x00RRGGBB - color of a pixel
  129.     edx = 0x01xxxxxx - invert color of a pixel
  130.           (low 24 bits are ignored)
  131. Returned value:
  132.   * function does not return value
  133.  
  134. ======================================================================
  135. ============ Function 2 - get the code of the pressed key. ===========
  136. ======================================================================
  137. Takes away the code of the pressed key from the buffer.
  138. Parameters:
  139.   * eax = 2 - function number
  140. Returned value:
  141.   * if the buffer is empty, function returns eax=1
  142.   * if the buffer is not empty, function returns al=0,
  143.     ah=code of the pressed key, high word of eax is zero
  144.   * if there is "hotkey", function returns al=2,
  145.     ah=scancode of the pressed key (0 for control keys),
  146.     high word of eax contains a status of control keys at the moment
  147.     of pressing a hotkey
  148. Remarks:
  149.   * There is a common system buffer of the pressed keys
  150.     by a size of 120 bytes, organized as queue.
  151.   * There is one more common system buffer on 120 "hotkeys".
  152.   * If the application with the inactive window calls this function,
  153.     the buffer of the pressed keys is considered to be empty.
  154.   * By default this function returns ASCII-codes; to switch
  155.     to the scancodes mode (and back) use function 66.
  156.     However, hotkeys are always notificated as scancodes.
  157.   * To find out, what keys correspond to what codes, start
  158.     the application keyascii and scancode.
  159.   * Scancodes come directly from keyboard and are fixed;
  160.     ASCII-codes turn out with usage of the conversion tables,
  161.     which can be set by subfunction 2 of function 21
  162.     and get by subfunction 2 of function 26.
  163.   * As a consequence, ASCII-codes take into account current
  164.     keyboard layout (rus/en) as opposed to scancodes.
  165.   * This function notifies only about those hotkeys, which were
  166.     defined by this thread by subfunction 4 of function 66.
  167.  
  168. ======================================================================
  169. ==================== Function 3 - get system time. ===================
  170. ======================================================================
  171. Parameters:
  172.   * eax = 3 - function number
  173. Returned value:
  174.   * eax = 0x00SSMMHH, where HH:MM:SS = Hours:Minutes:Seconds
  175.   * each item is BCD-number, for example,
  176.     for time 23:59:59 function returns 0x00595923
  177. Remarks:
  178.   * See also subfunction 9 of function 26 - get time from
  179.     the moment of start of the system; it is more convenient, because
  180.     returns simply DWORD-value of the time counter.
  181.   * System time can be set by function 22.
  182.  
  183. ======================================================================
  184. ============ Function 4 - draw text string in the window. ============
  185. ======================================================================
  186. Parameters:
  187.   * eax = 4 - function number
  188.   * ebx = [coordinate on axis x]*65536 + [coordinate on axis y]
  189.   * ecx = 0xX0RRGGBB, where
  190.     * RR, GG, BB specify text color
  191.     * X specifies the used font: 0=system monospaced,
  192.       1=system font of variable width
  193.   * edx = pointer to the beginning of the string
  194.   * esi = length of the string, must not exceed 255
  195. Returned value:
  196.   * function does not return value
  197. Remarks:
  198.   * Function outputs either first (esi and 0xFF) characters or
  199.     all characters before (but not including) terminating zero
  200.     (for ASCIIZ-strings) depending on what occurs first.
  201.   * First system font is read out at loading from the file char.mt,
  202.     second - from char2.mt.
  203.   * Both fonts have height 9 pixels, width of the monospaced font
  204.     is equal to 6 pixels.
  205.  
  206. ======================================================================
  207. ========================= Function 5 - delay. ========================
  208. ======================================================================
  209. Delays execution of the program on the given time.
  210. Parameters:
  211.   * eax = 5 - function number
  212.   * ebx = time in the 1/100 of second
  213. Returned value:
  214.   * function does not return value
  215. Remarks:
  216.   * Passing ebx=0 does not transfer control to the next process
  217.     and does not make any operations at all. If it is really required
  218.     to transfer control to the next process (to complete a current
  219.     time slice), use subfunction 1 of function 68.
  220.   * At current implementation there will be an immediate return from
  221.     the function, if the addition of ebx with current value of
  222.     time counter will call 32-bit overflow.
  223.  
  224. ======================================================================
  225. ============== Function 6 - read the file from ramdisk. ==============
  226. ======================================================================
  227. Parameters:
  228.   * eax = 6 - function number
  229.   * ebx = pointer to the filename
  230.   * ecx = number of start block, beginning from 1;
  231.     ecx=0 - read from the beginning of the file (same as ecx=1)
  232.   * edx = number of blocks to read;
  233.     edx=0 - read one block (same as edx=1)
  234.   * esi = pointer to memory area for the data
  235. Returned value:
  236.   * eax = file size in bytes, if the file was successfully read
  237.   * eax = -1, if the file was not found
  238. Remarks:
  239.   * This function is out-of-date; function 70 allows
  240.     to fulfil the same operations with the extended possibilities.
  241.   * Block = 512 bytes.
  242.   * For reading all file you can specify the certainly large value
  243.     in edx, for example, edx = -1; but in this case be ready that
  244.     the program will "fall", if the file will appear too large and can
  245.     not be placed in the program memory.
  246.   * The filename must be either in the format 8+3 characters
  247.     (first 8 characters - name itself, last 3 - extension,
  248.     the short names and extensions are supplemented with spaces),
  249.     or in the format 8.3 characters "FILE.EXT"/"FILE.EX "
  250.     (name no more than 8 characters, dot, extension 3 characters
  251.     supplemented if necessary by spaces).
  252.     The filename must be written with capital letters. The terminating
  253.     character with code 0 is not necessary (not ASCIIZ-string).
  254.   * This function does not support folders on the ramdisk.
  255.  
  256. ======================================================================
  257. =============== Function 7 - draw image in the window. ===============
  258. ======================================================================
  259. Paramters:
  260.   * eax = 7 - function number
  261.   * ebx = pointer to the image in the format BBGGRRBBGGRR...
  262.   * ecx = [size on axis x]*65536 + [size on axis y]
  263.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  264. Returned value:
  265.   * function does not return value
  266. Remarks:
  267.   * Coordinates of the image are coordinates of the upper left corner
  268.     of the image relative to the window.
  269.   * Size of the image in bytes is 3*xsize*ysize.
  270.  
  271. ======================================================================
  272. =============== Function 8 - define/delete the button. ===============
  273. ======================================================================
  274. Parameters for button definition:
  275.   * eax = 8 - function number
  276.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  277.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  278.   * edx = 0xXYnnnnnn, where:
  279.     * nnnnnn = identifier of the button
  280.     * high (31st) bit of edx is cleared
  281.     * if 30th bit of edx is set - do not draw the button
  282.     * if 29th bit of edx is set - do not draw a frame
  283.       at pressing the button
  284.   * esi = 0x00RRGGBB - color of the button
  285. Parameters for button deleting:
  286.   * eax = 8 - function number
  287.   * edx = 0x80nnnnnn, where nnnnnn - identifier of the button
  288. Returned value:
  289.   * function does not return value
  290. Remarks:
  291.   * Sizes of the button must be more than 0 and less than 0x8000.
  292.   * For windows with skin definition of the window
  293.     (call of 0th function) creates two standard buttons -
  294.     for close of the window with identifier 1 and
  295.     for minimize of the window with identifier 0xffff.
  296.   * The creation of two buttons with same identifiers is admitted.
  297.   * The button with the identifier 0xffff at pressing is interpreted
  298.     by the system as the button of minimization, the system handles
  299.     such pressing independently, not accessing to the application.
  300.     In rest it is usual button.
  301.   * Total number of buttons for all applications is limited to 4095.
  302.  
  303. ======================================================================
  304. ============ Function 9 - information on execution thread. ===========
  305. ======================================================================
  306. Parameters:
  307.   * eax = 9 - function number
  308.   * ebx = pointer to 1-Kb buffer
  309.   * ecx = number of the slot of the thread
  310.     ecx = -1 - get information on the current thread
  311. Returned value:
  312.   * eax = maximum number of the slot of a thread
  313.   * buffer pointed to by ebx contains the following information:
  314.     * +0: dword: usage of the processor (how many time units
  315.       per second leaves on execution of this thread)
  316.     * +4: word: position of the window of thread in the window stack
  317.     * +6: word: (has no relation to the specified thread)
  318.       number of the thread slot, which window has in the window stack
  319.       position ecx
  320.     * +8: word: reserved
  321.     * +10 = +0xA: 11 bytes: name of the process
  322.       (name of corresponding executable file in the format 8+3)
  323.     * +21 = +0x15: byte: alignment, this byte preserves
  324.     * +22 = +0x16: dword: address of the process in memory
  325.     * +26 = +0x1A: dword: size of used memory - 1
  326.     * +30 = +0x1E: dword: identifier (PID/TID)
  327.     * +34 = +0x22: dword: coordinate of the thread window on axis x
  328.     * +38 = +0x26: dword: coordinate of the thread window on axis y
  329.     * +42 = +0x2A: dword: size of the thread window on axis x
  330.     * +46 = +0x2E: dword: size of the thread window on axis y
  331.     * +50 = +0x32: word: status of the thread slot:
  332.       * 0 = thread is running
  333.       * 1 = thread is suspended
  334.       * 2 = thread is suspended while waiting for event
  335.       * 3 = thread is terminating as a result of call to function -1
  336.         or under duress as a result of call to subfunction 2
  337.         of function 18 or termination of the system
  338.       * 4 = thread is terminating as a result of exception
  339.       * 5 = thread waits for event
  340.       * 9 = requested slot is free, all other information on the slot
  341.         is not meaningful
  342. Remarks:
  343.   * Slots are numbered starting from 1.
  344.   * Returned value is not a total number of threads, because there
  345.     can be free slots.
  346.   * When process is starting, system automatically creates
  347.     execution thread.
  348.   * Function gives information on the thread. Each process has
  349.     at least one thread. One process can create many threads,
  350.     in this case each thread has its own slot and the fields
  351.     +10, +22, +26 in these slots coincide.
  352.     Applications have no common way to define whether two threads
  353.     belong to one process.
  354.   * The active window - window on top of the window stack -
  355.     receives the messages on a keyboard input. For such window
  356.     the position in the window stack coincides with returned value.
  357.   * Slot 1 corresponds to special system thread, for which:
  358.     * the window is in the bottom of the window stack, the fields
  359.       +4 and +6 contain value 1
  360.     * name of the process - "OS/IDLE" (supplemented by spaces)
  361.     * address of the process in memory is 0, size of used memory is
  362.       16 Mb (0x1000000)
  363.     * PID=1
  364.     * coordinates and sizes of the window are by convention set to 0
  365.     * status of the slot is always 0 (running)
  366.     * the execution time adds of time leaving on operations itself
  367.       and idle time in waiting for interrupt (which can be got by call
  368.       to subfunction 4 of function 18).
  369.   * Beginning from slot 2, the normal applications are placed.
  370.   * The normal applications are placed in memory at the address
  371.     0x10000000 (kernel constand 'std_application_base_address').
  372.     There is no intersection, as each process has its own page table.
  373.   * At creation of the thread it is assigned the slot
  374.     in the system table and identifier (Process/Thread IDentifier =
  375.     PID/TID), which do not vary with time for given thread.
  376.     After completion of the thread its slot can be anew used
  377.     for another thread. The thread identifier can not be assigned
  378.     to other thread even after completion of this thread.
  379.     Identifiers, assigned to new threads, grow monotonously.
  380.   * If the thread has not yet defined the window by call to
  381.     function 0, the position and the sizes
  382.     of its window are considered to be zero.
  383.   * At the moment only the part of the buffer by a size
  384.     52 = 0x34 bytes is used. Nevertheless it is recommended to use
  385.     1-Kb buffer for the future compatibility, in the future
  386.     some fields can be added.
  387.  
  388. ======================================================================
  389. ==================== Function 10 - wait for event. ===================
  390. ======================================================================
  391. If the message queue is empty, waits for appearance of the message
  392. in queue. In this state thread does not consume CPU time.
  393. Then reads out the message from queue.
  394.  
  395. Parameters:
  396.   * eax = 10 - function number
  397. Returned value:
  398.   * eax = event (see the list of events)
  399. Remarks:
  400.   * Those events are taken into account only which enter into
  401.     a mask set by function 40. By default it is
  402.     redraw, key and button events.
  403.   * To check, whether there is a message in queue, use function 11.
  404.     To wait for no more than given time, use function 23.
  405.  
  406. ======================================================================
  407. =============== Function 11 - check for event, no wait. ==============
  408. ======================================================================
  409. If the message queue contains event, function reads out
  410. and return it. If the queue is empty, function returns 0.
  411. Parameters:
  412.   * eax = 11 - function number
  413. Returned value:
  414.   * eax = 0 - message queue is empty
  415.   * else eax = event (see the list of events)
  416. Remarks:
  417.   * Those events are taken into account only, which enter into
  418.     a mask set by function 40. By default it is
  419.     redraw, key and button events.
  420.   * To wait for event, use function 10.
  421.     To wait for no more than given time, use function 23.
  422.  
  423. ======================================================================
  424. =============== Function 12 - begin/end window redraw. ===============
  425. ======================================================================
  426.  
  427. ------------ Subfunction 1 - begin redraw of the window. -------------
  428. Parameters:
  429.   * eax = 12 - function number
  430.   * ebx = 1 - subfunction number
  431. Returned value:
  432.   * function does not return value
  433.  
  434. ------------- Subfunction 2 - end redraw of the window. --------------
  435. Parameters:
  436.   * eax = 12 - function number
  437.   * ebx = 2 - subfunction number
  438. Returned value:
  439.   * function does not return value
  440. Remarks:
  441.   * Subfunction 1 deletes all buttons defined with
  442.     function 8, they must be defined again.
  443.  
  444. ======================================================================
  445. ============ Function 13 - draw a rectangle in the window. ===========
  446. ======================================================================
  447. Parameters:
  448.   * eax = 13 - function number
  449.   * ebx = [coordinate on axis x]*65536 + [size on axis x]
  450.   * ecx = [coordinate on axis y]*65536 + [size on axis y]
  451.   * edx = color 0xRRGGBB or 0x80RRGGBB for gradient fill
  452. Returned value:
  453.   * function does not return value
  454. Remarks:
  455.   * Coordinates are understood as coordinates of the left upper corner
  456.     of a rectangle relative to the window.
  457.  
  458. ======================================================================
  459. =================== Function 14 - get screen size. ===================
  460. ======================================================================
  461. Parameters:
  462.   * eax = 14 - function number
  463. Returned value:
  464.   * eax = [xsize]*65536 + [ysize], where
  465.   * xsize = x-coordinate of the right lower corner of the screen =
  466.             horizontal size - 1
  467.   * ysize = y-coordinate of the right lower corner of the screen =
  468.             vertical size - 1
  469. Remarks:
  470.   * See also subfunction 5 of function 48 - get sizes of
  471.     working area of the screen.
  472.  
  473. ======================================================================
  474. == Function 15, subfunction 1 - set a size of the background image. ==
  475. ======================================================================
  476. Parameters:
  477.   * eax = 15 - function number
  478.   * ebx = 1 - subfunction number
  479.   * ecx = width of the image
  480.   * edx = height of the image
  481. Returned value:
  482.   * function does not return value
  483. Remarks:
  484.   * There is no checks for correctness. The setting of too large
  485.     values will result that the background will contain data abroad
  486.     of buffer for the background image. Buffer size = 0x160000-0x10,
  487.     that corresponds to maximum size 800*600. (800*600*3=0x15F900)
  488.   * For update of the screen (after completion of a series of commands
  489.     working with a background) call subfunction 3.
  490.   * There is a pair function for get size of the background image -
  491.     subfunction 1 of function 39.
  492.  
  493. ======================================================================
  494. === Function 15, subfunction 2 - put pixel on the background image. ==
  495. ======================================================================
  496. Parameters:
  497.   * eax = 15 - function number
  498.   * ebx = 2 - subfunction number
  499.   * ecx = offset
  500.   * edx = color of a pixel 0xRRGGBB
  501. Returned value:
  502.   * function does not return value
  503. Remarks:
  504.   * Offset for a pixel with coordinates (x,y) is calculated as
  505.     (x+y*xsize)*3.
  506.   * If the given offset exceeds 0x160000-16 = 1.375 Mb - 16 bytes,
  507.     the call is ignored.
  508.   * For update of the screen (after completion of a series of commands
  509.     working with a background) call subfunction 3.
  510.   * There is a pair function for get pixel on the background image -
  511.     subfunction 2 of function 39.
  512.  
  513. ======================================================================
  514. =========== Function 15, subfunction 3 - redraw background. ==========
  515. ======================================================================
  516. Parameters:
  517.   * eax = 15 - function number
  518.   * ebx = 3 - subfunction number
  519. Returned value:
  520.   * function does not return value
  521.  
  522. ======================================================================
  523. == Function 15, subfunction 4 - set drawing mode for the background. =
  524. ======================================================================
  525. Parameters:
  526.   * eax = 15 - function number
  527.   * ebx = 4 - subfunction number
  528.   * ecx = drawing mode:
  529.     * 1 = tile
  530.     * 2 = stretch
  531. Returned value:
  532.   * function does not return value
  533. Remarks:
  534.   * For update of the screen (after completion of a series of commands
  535.     working with a background) call subfunction 3.
  536.   * There is a pair function for get drawing mode of the background -
  537.     subfunction 4 of function 39.
  538.  
  539. ======================================================================
  540. ===================== Function 15, subfunction 5 =====================
  541. ============ Put block of pixels on the background image. ============
  542. ======================================================================
  543. Parameters:
  544.   * eax = 15 - function number
  545.   * ebx = 5 - subfunction number
  546.   * ecx = pointer to the data in the format BBGGRRBBGGRR...
  547.   * edx = offset in data of the background image
  548.   * esi = size of data in bytes = 3 * number of pixels
  549. Returned value:
  550.   * function does not return value
  551. Remarks:
  552.   * If the block gets out abroad 0x160000-16 = 1.375 Mb - 16 bytes,
  553.     the call is ignored.
  554.   * Color of each pixel is stored as 3-bytes value BBGGRR.
  555.   * Pixels of the background image are written sequentially
  556.     from left to right, from up to down.
  557.   * Offset of pixel with coordinates (x,y) is (x+y*xsize)*3.
  558.   * For update of the screen (after completion of a series of commands
  559.     working with a background) call subfunction 3.
  560.  
  561. ======================================================================
  562. =============== Function 16 - save ramdisk on a floppy. ==============
  563. ======================================================================
  564. Parameters:
  565.   * eax = 16 - function number
  566.   * ebx = 1 or ebx = 2 - on which floppy save
  567. Returned value:
  568.   * eax = 0 - success
  569.   * eax = 1 - error
  570.  
  571. ======================================================================
  572. ======= Function 17 - get the identifier of the pressed button. ======
  573. ======================================================================
  574. Takes away the code of the pressed button from the buffer.
  575. Parameters:
  576.   * eax = 17 - function number
  577. Returned value:
  578.   * if the buffer is empty, function returns eax=1
  579.   * if the buffer is not empty, function returns al=0,
  580.     high 24 bits of eax contain button identifier (in particular, ah
  581.     contains low byte of the identifier; if all buttons have
  582.     the identifier less than 256, ah is enough to distinguish).
  583. Remarks:
  584.   * "Buffer" keeps only one button, at pressing the new button the
  585.     information about old is lost.
  586.   * The call of this function by an application with inactive window
  587.     will return answer "buffer is empty".
  588.  
  589. ======================================================================
  590. ============ Function 18, subfunction 1 - system shutdown. ===========
  591. ======================================================================
  592. Parameters:
  593.   * eax = 18 - function number
  594.   * ebx = 1 - subfunction number
  595. Returned value:
  596.   * function always return eax = 0 as tag of success
  597. Remarks:
  598.   * On the last step menu of exit from the system appears and waits
  599.     response of the user.
  600.   * See also subfunction 9, system shutdown with
  601.     the parameter to force the choice in the exit menu.
  602.  
  603. ======================================================================
  604. = Function 18, subfunction 2 - terminate process/thread by the slot. =
  605. ======================================================================
  606. Parameters:
  607.   * eax = 18 - function number
  608.   * ebx = 2 - subfunction number
  609.   * ecx = number of the slot of process/thread
  610. Returned value:
  611.   * function does not return value
  612. Remarks:
  613.   * It is impossible to terminate system thread OS/IDLE (with
  614.     number of the slot 1),
  615.     it is possible to terminate any normal process/thread.
  616.   * See also subfunction 18 - terminate
  617.     process/thread by the identifier.
  618.  
  619. ======================================================================
  620. ===================== Function 18, subfunction 3 =====================
  621. ============= Make active the window of the given thread. ============
  622. ======================================================================
  623. Parameters:
  624.   * eax = 18 - function number
  625.   * ebx = 3 - subfunction number
  626.   * ecx = number of the thread slot
  627. Returned value:
  628.   * function does not return value
  629. Remarks:
  630.   * If correct, but nonexistent slot is given,
  631.     some window is made active.
  632.   * To find out, which window is active, use subfunction 7.
  633.  
  634. ======================================================================
  635. ===================== Function 18, subfunction 4 =====================
  636. =========== Get counter of idle time units per one second. ===========
  637. ======================================================================
  638. Idle time units are units, in which the processor stands idle
  639. in waiting for interrupt (in the command 'hlt').
  640.  
  641. Parameters:
  642.   * eax = 18 - function number
  643.   * ebx = 4 - subfunction number
  644. Returned value:
  645.   * eax = value of the counter of idle time units per one second
  646.  
  647. ======================================================================
  648. ========== Function 18, subfunction 5 - get CPU clock rate. ==========
  649. ======================================================================
  650. Parameters:
  651.   * eax = 18 - function number
  652.   * ebx = 5 - subfunction number
  653. Returned value:
  654.   * eax = clock rate (modulo 2^32 clock ticks = 4GHz)
  655.  
  656. ======================================================================
  657.  Function 18, subfunction 6 - save ramdisk to the file on hard drive.
  658. ======================================================================
  659. Parameters:
  660.   * eax = 18 - function number
  661.   * ebx = 6 - subfunction number
  662.   * ecx defines path to the file:
  663.     * 1 = in the folder "/KOLIBRI"
  664.     * 2 = in the root folder
  665.     * 3 = edx points to the path (names of folders in the format 8+3,
  666.       divided by '/')
  667. Returned value:
  668.   * eax = 0 - success
  669.   * else eax = error code of the file system
  670. Çàìå÷àíèÿ:
  671.   * Filename is fixed, "menuet.img" (global kernel variable
  672.     'image_save' from 'preboot.inc')
  673.   * Drive and partition are defined by subfunction 7
  674.     and subfunction 8 of function 21.
  675.   * All folders in the given path must exist, otherwise function
  676.     returns value 5, "file not found".
  677.  
  678. ======================================================================
  679. =========== Function 18, subfunction 7 - get active window. ==========
  680. ======================================================================
  681. Parameters:
  682.   * eax = 18 - function number
  683.   * ebx = 7 - subfunction number
  684. Returned value:
  685.   * eax = number of the active window
  686.     (number of the slot of the thread with active window)
  687. Remarks:
  688.   * Active window is at the top of the window stack and receives
  689.     messages on all keyboard input.
  690.   * To make a window active, use subfunction 3.
  691.  
  692. ======================================================================
  693. == Function 18, subfunction 8 - disable/enable the internal speaker. =
  694. ======================================================================
  695. If speaker sound is disabled, all calls to subfunction 55 of
  696. function 55 are ignored. If speaker sound is enabled,
  697. they are routed on builtin speaker.
  698.  
  699. ------------------- Subsubfunction 1 - get status. -------------------
  700. Parameters:
  701.   * eax = 18 - function number
  702.   * ebx = 8 - subfunction number
  703.   * ecx = 1 - number of the subsubfunction
  704. Returned value:
  705.   * eax = 0 - speaker sound is enabled; 1 - disabled
  706.  
  707. ----------------- Subsubfunction 2 - toggle status. ------------------
  708. Toggles states of disable/enable.
  709. Parameters:
  710.   * eax = 18 - function number
  711.   * ebx = 8 - subfunction number
  712.   * ecx = 2 - number of the subsubfunction
  713. Returned value:
  714.   * function does not return value
  715.  
  716. ======================================================================
  717. == Function 18, subfunction 9 - system shutdown with the parameter. ==
  718. ======================================================================
  719. Parameters:
  720.   * eax = 18 - function number
  721.   * ebx = 9 - subfunction number
  722.   * ecx = parameter:
  723.     * 1 = on the last step of shutdown save ramdisk on a floppy and
  724.       then show the exit menu and request further operations
  725.       from the user
  726.     * 2 = turn off computer
  727.     * 3 = reboot computer
  728.     * 4 = restart the kernel from the file 'kernel.mnt' on ramdisk
  729. Returned value:
  730.   * at incorrect ecx the registers do not change (i.e. eax=18)
  731.   * by correct call function always returns eax=0
  732.     as the tag of success
  733. Remarks:
  734.   * Do not rely on returned value by incorrect call, it can be
  735.     changed in future versions of the kernel.
  736.   * It is possible to use subfunction 1, that on the last step
  737.     the user makes choice himself.
  738.   * It is not recommended to use value ecx=1 (to not irritate the user
  739.     with excessive questions); to save ramdisk on a floppy use
  740.     function 16 (which admits specification, on which floppy to
  741.     write), and to shutdown with the exit menu use already mentioned
  742.     subfunction 1.
  743.  
  744. ======================================================================
  745. ===== Function 18, subfunction 10 - minimize application window. =====
  746. ======================================================================
  747. Minimizes the own window.
  748. Parameters:
  749.   * eax = 18 - function number
  750.   * ebx = 10 - subfunction number
  751. Returned value:
  752.   * function does not return value
  753. Remarks:
  754.   * The minimized window from the point of view of function 9
  755.     keeps position and sizes.
  756.   * Restoring of an application window occurs at its activation by
  757.     subfunction 3.
  758.   * Usually there is no necessity to minimize/restire a window
  759.     obviously: minimization of a window is carried out by the system
  760.     at pressing the minimization button (for skinned windows
  761.     it is defined automatically by function 0,
  762.     for other windows it can be defined manually by function 8),
  763.     restore of a window is done by the application '@panel'.
  764.  
  765. ======================================================================
  766.  Function 18, subfunction 11 - get information on the disk subsystem.
  767. ======================================================================
  768. Parameters:
  769.   * eax = 18 - function number
  770.   * ebx = 11 - subfunction number
  771.   * ecx = type of the table:
  772.     * 1 = short version, 10 bytes
  773.     * 2 = full version, 65536 bytes
  774.   * edx = pointer to the buffer (in the application) for the table
  775. Returned value:
  776.   * function does not return value
  777. Format of the table: short version:
  778.   * +0: byte: information about FDD's (drives for floppies),
  779.     AAAABBBB, where AAAA gives type of the first drive, BBBB -
  780.     of the second regarding to the following list:
  781.     * 0 = there is no drive
  782.     * 1 = 360Kb, 5.25''
  783.     * 2 = 1.2Mb, 5.25''
  784.     * 3 = 720Kb, 3.5''
  785.     * 4 = 1.44Mb, 3.5''
  786.     * 5 = 2.88Mb, 3.5'' (such drives are not used anymore)
  787.     For example, for the standard configuration from one 1.44-drive
  788.     here will be 40h, and for the case 1.2Mb on A: and 1.44Mb on B:
  789.     the value is 24h.
  790.   * +1: byte: information about hard disks and CD-drives, AABBCCDD,
  791.     where AA corresponds to the controller IDE0, ..., DD - IDE3:
  792.     * 0 = device is absent
  793.     * 1 = hard drive
  794.     * 2 = CD-drive
  795.     For example, in the case HD on IDE0 and CD on IDE2
  796.     this field contains 48h.
  797.   * +2: 4 db: number of the retrieved partitions on hard disks
  798.     at accordingly IDE0,...,IDE3.
  799.     If the hard disk on IDEx is absent, appropriate byte is zero,
  800.     otherwise it shows number of the recognized partitions, which
  801.     can be not presented (if the drive is not formatted or if
  802.     the file system is not supported). Current version of the kernel
  803.     supports only FAT16 and FAT32 for hard disks.
  804.   * +6: 4 db: reserved
  805. Format of the table: full version:
  806.   * +0: 10 db: same as for the short version
  807.   * +10: 100 db: data for the first partition
  808.   * +110: 100 db: data for the second partition
  809.   * ...
  810.   * +10+100*(n-1): 100 db: data for the last partition
  811. The partitions are located as follows: at first sequentially all
  812. recoginzed partitions on HD on IDE0 (if present),
  813. then on HD on IDE1 (if present) and so on up to IDE3.
  814. Format of the information about partition
  815. (at moment only FAT is supported):
  816.   * +0: dword: first physical sector of the partition
  817.   * +4: dword: last physical sector of the partition
  818.     (belongs to the partition)
  819.   * +8: dword: sectors per one copy of FAT
  820.   * +12 = +0xC: dword: number of copies of FAT
  821.   * +16 = +0x10: dword: number of sectors per cluster
  822.   * +20 = +0x14: dword: bytes per sector;
  823.     current implementation expects 0x200 = 512 in this field
  824.   * +24 = +0x18: dword: first root cluster in FAT32, 0 for FAT16
  825.   * +28 = +0x1C: dword: first physical sector of FAT
  826.   * +32 = +0x20: dword: first physical root sector for FAT16,
  827.     ignored for FAT32
  828.   * +36 = +0x24: dword: number of root sectors for FAT16,
  829.     0 for FAT32
  830.   * +40 = +0x28: dword: physical sector of the beginning of
  831.     the data area
  832.   * +44 = +0x2C: dword: maximum number of a cluster
  833.   * +48 = +0x30: dword: physical sector of the information
  834.     about the file system for FAT32, ignored for FAT16
  835.   * +52 = +0x34: dword: value used as boundary for special
  836.     values in FAT
  837.   * +56 = +0x38: dword: value used for bad clusters in FAT
  838.   * +60 = +0x3C: dword: value used as the end marker for FAT chain
  839.   * +64 = +0x40: dword: mask for FAT items
  840.   * +68 = +0x44: byte: file system type: 16 èëè 32
  841.   * +69 = +0x45: 31 db: reserved
  842. Remarks:
  843.   * The short table can be used for obtaining the information about
  844.     available devices.
  845.   * First two fields in the information about partition
  846.     gives the parameters of partition, other - parameters of
  847.     FAT file system. For other file systems (when they will be
  848.     supported) specific for file system information will be, of
  849.     course, another, but first two fields will have the same sense.
  850.  
  851. ======================================================================
  852. ========== Function 18, subfunction 13 - get kernel version. =========
  853. ======================================================================
  854. Parameters:
  855.   * eax = 18 - function number
  856.   * ebx = 13 - subfunction number
  857.   * ecx = pointer to the buffer (not less than 16 bytes), where
  858.     the information will be placed
  859. Returned value:
  860.   * function does not return value
  861. Structure of the buffer:
  862. db a,b,c,d for version a.b.c.d
  863. db UID_xxx: one of UID_NONE=0, UID_MENUET=1, UID_KOLIBRI=2
  864. db 'name',0 - ASCIIZ-string with the name
  865. For Kolibri 0.5.8.1 kernel:
  866. db 0,5,8,1
  867. db 2
  868. db 'Kolibri',0
  869.  
  870. ======================================================================
  871. ======= Function 18, subfunction 14 - wait for screen retrace. =======
  872. ======================================================================
  873. Waits for the beginning of retrace of the scanning ray of the screen
  874. monitor.
  875. Parameters:
  876.   * eax = 18 - function number
  877.   * ebx = 14 - subfunction number
  878. Returned value:
  879.   * eax = 0 as the tag of success
  880. Remarks:
  881.   * Function is intended only for active high-efficiency graphics
  882.     applications; is used for smooth output of a graphics.
  883.  
  884. ======================================================================
  885. == Function 18, subfunction 15 - center mouse cursor on the screen. ==
  886. ======================================================================
  887. Parameters:
  888.   * eax = 18 - function number
  889.   * ebx = 15 - subfunction number
  890. Returned value:
  891.   * eax = 0 as the tag of success
  892.  
  893. ======================================================================
  894. ========= Function 18, subfunction 16 - get size of free RAM. ========
  895. ======================================================================
  896. Parameters:
  897.   * eax = 18 - function number
  898.   * ebx = 16 - subfunction number
  899. Returned value:
  900.   * eax = size of free memory in kilobytes
  901.  
  902. ======================================================================
  903. ======== Function 18, subfunction 17 - get full amount of RAM. =======
  904. ======================================================================
  905. Parameters:
  906.   * eax = 18 - function number
  907.   * ebx = 17 - subfunction number
  908. Returned value:
  909.   * eax = total size of existing memory in kilobytes
  910.  
  911. ======================================================================
  912. ===================== Function 18, subfunction 18 ====================
  913. ============= Terminate process/thread by the identifier. ============
  914. ======================================================================
  915. Parameters:
  916.   * eax = 18 - function number
  917.   * ebx = 18 - subfunction number
  918.   * ecx = identifer of process/thread (PID/TID)
  919. Returned value:
  920.   * eax = 0 - success
  921.   * eax = -1 - error (process is not found or is system)
  922. Remarks:
  923.   * It is impossible to terminate system thread OS/IDLE (identifier
  924.     1), it is possible to terminate any normal process/thread.
  925.   * See also subfunction 2 - terminate
  926.     process/thread by given slot.
  927.  
  928. ======================================================================
  929. ============ Function 19 - start application from ramdisk. ===========
  930. ======================================================================
  931. Parameters:
  932.   * eax = 19 - function number
  933.   * ebx = pointer to the application name in format similar
  934.     to function 6
  935.   * ecx = 0 or ecx = pointer to command line parameters
  936. Returned value:
  937.   * If eax > 0, then eax contains PID of the created process
  938.   * If eax < 0, then -eax - file system error code
  939. Remarks:
  940.   * This function is obsolete; use subfunction 7 of function 70.
  941.   * Command line must be terminated by the character with the code 0
  942.     (ASCIIZ-string); function takes into account either all characters
  943.     up to terminating zero inclusively or first 256 character
  944.     regarding what is less.
  945.  
  946. ======================================================================
  947. ==================== Function 20 - MIDI interface. ===================
  948. ======================================================================
  949.  
  950. ----------------------- Subfunction 1 - reset ------------------------
  951. Parameters:
  952.   * eax = 20 - function number
  953.   * ebx = 1 - subfunction number
  954.  
  955. -------------------- Subfunction 2 - output byte ---------------------
  956. Parameters:
  957.   * eax = 20 - function number
  958.   * ebx = 2 - subfunction number
  959.   * cl = byte for output
  960. Returned value (is the same for both subfunctions):
  961.   * eax = 0 - success
  962.   * eax = 1 - base port is not defined
  963. Remarks:
  964.   * Previously the base port must be defined by
  965.     subfunction 1 of function 21.
  966.  
  967. ======================================================================
  968. ======== Function 21, subfunction 1 - set MPU MIDI base port. ========
  969. ======================================================================
  970. Parameters:
  971.   * eax = 21 - function number
  972.   * ebx = 1 - subfunction number
  973.   * ecx = number of base port
  974. Returned value
  975.   * eax = 0 - success
  976.   * eax = -1 - erratic number of a port
  977. Remarks:
  978.   * Number of a port must satisfy to conditions 0x100<=ecx<=0xFFFF.
  979.   * The installation of base is necessary for function 20.
  980.   * To get base port use subfunction 1 of function 26.
  981.  
  982. ======================================================================
  983. ========== Function 21, subfunction 2 - set keyboard layout. =========
  984. ======================================================================
  985. Keyboard layout is used to convert keyboard scancodes to ASCII-codes,
  986. which will be read by function 2.
  987. Parameters:
  988.   * eax = 21 - function number
  989.   * ebx = 2 - subfunction number
  990.   * ecx = which layout to set:
  991.     * 1 = normal layout
  992.     * 2 = layout at pressed Shift
  993.     * 3 = layout at pressed Alt
  994.   * edx = pointer to layout - table of length 128 bytes
  995. Or:
  996.   * ecx = 9
  997.   * dx = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  998. Returned value:
  999.   * eax = 0 - success
  1000.   * eax = 1 - incorrect parameter
  1001. Remarks:
  1002.   * If Alt is pressed, the layout with Alt is used;
  1003.     if Alt is not pressed, but Shift is pressed,
  1004.     the layout with Shift is used;
  1005.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1006.     layout is used and then from the code is subtracted 0x60;
  1007.     if no control key is pressed, the normal layout is used.
  1008.   * To get layout and country identifier use
  1009.     subfunction 2 of function 26.
  1010.   * Country identifier is global system variable, which is not used
  1011.     by the kernel itself; however the application '@panel' displays
  1012.     the corresponding icon.
  1013.   * The application @panel switches layouts on user request.
  1014.  
  1015. ======================================================================
  1016. ============== Function 21, subfunction 3 - set CD base. =============
  1017. ======================================================================
  1018. Parameters:
  1019.   * eax = 21 - function number
  1020.   * ebx = 3 - subfunction number
  1021.   * ecx = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1022. Returned value:
  1023.   * eax = 0
  1024. Remarks:
  1025.   * CD base is used by function 24.
  1026.   * To get CD base use subfunction 3 of function 26.
  1027.  
  1028. ======================================================================
  1029. ====== Function 21, subfunction 4 - set Sound Blaster base port. =====
  1030. ======================================================================
  1031. Parameters:
  1032.   * eax = 21 - function number
  1033.   * ebx = 4 - subfunction number
  1034.   * ecx = number of the base port
  1035. Returned value:
  1036.   * eax = 0 - success
  1037.   * eax = -1 - erratic port number
  1038. Remarks:
  1039.   * Number of the port must satisfy to conditions 0x100<=ecx<=0xFFFF.
  1040.   * The installation of the base is necessary for
  1041.     functions 25, 28, 55.
  1042.   * To get base port use subfunction 4 of function 26.
  1043.  
  1044. ======================================================================
  1045. ========== Function 21, subfunction 5 - set system language. =========
  1046. ======================================================================
  1047. Parameters:
  1048.   * eax = 21 - function number
  1049.   * ebx = 5 - subfunction number
  1050.   * ecx = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1051. Returned value:
  1052.   * eax = 0
  1053. Remarks:
  1054.   * System language is global system variable and is not used
  1055.     by the kernel itself, however application @panel draws the
  1056.     appropriate icon.
  1057.   * Function does not check for correctness, as the kernel does not
  1058.     use this variable.
  1059.   * To get system language use subfunction 5 of function 26.
  1060.  
  1061. ======================================================================
  1062. =========== Function 21, subfunction 6 - set WSS base port. ==========
  1063. ======================================================================
  1064. Parameters:
  1065.   * eax = 21 - function number
  1066.   * ebx = 6 - subfunction number
  1067.   * ecx = base port
  1068. Returned value:
  1069.   * eax = 0 - success
  1070.   * eax = -1 - erratic port number
  1071. Remarks:
  1072.   * Port number must satisfy to condition 0x100<=ecx.
  1073.   * WSS base is used by function 27.
  1074.   * To get WSS base port use subfunction 6 of function 26.
  1075.  
  1076. ======================================================================
  1077. ============== Function 21, subfunction 7 - set HD base. =============
  1078. ======================================================================
  1079. The HD base defines hard disk to write with usage of obsolete
  1080. file system functions and functions implicitly using the hard disk
  1081. (such as subfunction 6 of function 18);
  1082. at usage of function 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1083. these function set base themselves.
  1084. Parameters:
  1085.   * eax = 21 - function number
  1086.   * ebx = 7 - subfunction number
  1087.   * ecx = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1088. Returned value:
  1089.   * eax = 0
  1090. Remarks:
  1091.   * Any application at any time can change the base.
  1092.   * Do not change base, when any application works with hard disk.
  1093.     If you do not want system bugs.
  1094.   * To get HD base use subfunction 7 of function 26.
  1095.   * It is also necessary to define used partition of hard disk by
  1096.     subfunction 8.
  1097.  
  1098. ======================================================================
  1099. ========= Function 21, subfunction 8 - set used HD partition. ========
  1100. ======================================================================
  1101. The HD partition defines partition of the hard disk to write with
  1102. usage of obsolete file system functions and functions implicitly
  1103. using the hard disk (such as subfunction 6 of function 18);
  1104. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1105. these functions set base and partition themselves.
  1106. Parameters:
  1107.   * eax = 21 - function number
  1108.   * ebx = 8 - subfunction number
  1109.   * ecx = HD partition (beginning from 1)
  1110. Return value:
  1111.   * eax = 0
  1112. Remarks:
  1113.   * Any application at any time can change partition.
  1114.   * Do not change partition when any application works with hard disk.
  1115.     If you do not want system bugs.
  1116.   * To get used partition use subfunction 8 of function 26.
  1117.   * There is no correctness checks.
  1118.   * To get the number of partitions of a hard disk use
  1119.     subfunction 11 of function 18.
  1120.   * It is also necessary to define used HD base by subfunction 7.
  1121.  
  1122. ======================================================================
  1123. ======== Function 21, subfunction 10 - set sound DMA channel. ========
  1124. ======================================================================
  1125. Parameters:
  1126.   * eax = 21 - function number
  1127.   * ebx = 10 - subfunction number
  1128.   * ecx = number of channel (from 0 up to 3 inclusively)
  1129. Returned value:
  1130.   * eax = 0 - success
  1131.   * eax = -1 - incorrect channel number
  1132. Remarks:
  1133.   * Number of DMA channel is used in subfunction 1 of function 55.
  1134.   * To get sound DMA channel use subfunction 10 of function 26.
  1135.  
  1136. ======================================================================
  1137.  Function 21, subfunction 11 - enable/disable low-level access to HD.
  1138. ======================================================================
  1139. Parameters:
  1140.   * eax = 21 - function number
  1141.   * ebx = 11 - subfunction number
  1142.   * ecx = 0/1 - disable/enable
  1143. Returned value:
  1144.   * eax = 0
  1145. Remarks:
  1146.   * Is used in LBA-read (subfunction 8 of function 58).
  1147.   * The current implementation uses only low bit of ecx.
  1148.   * To get current status use subfunction 11 of function 26.
  1149.  
  1150. ======================================================================
  1151.  Function 21, subfunction 12 - enable/disable low-level access to PCI.
  1152. ======================================================================
  1153. Parameters:
  1154.   * eax = 21 - function number
  1155.   * ebx = 12 - subfunction number
  1156.   * ecx = 0/1 - disable/enable
  1157. Returned value:
  1158.   * eax = 0
  1159. Remarks:
  1160.   * Is used in operations with PCI bus (function 62).
  1161.   * The current implementation uses only low bit of ecx.
  1162.   * To get current status use subfunction 12 of function 26.
  1163.  
  1164. ======================================================================
  1165. ============ Function 21, subfunction 13, subsubfunction 1 ===========
  1166. ======== Initialize + get information on the driver vmode.mdr. =======
  1167. ======================================================================
  1168. Parameters:
  1169.   * eax = 21 - function number
  1170.   * ebx = 13 - subfunction number
  1171.   * ecx = 1 - number of the driver function
  1172.   * edx = pointer to 512-bytes buffer
  1173. Returned value:
  1174.   * if driver is not loaded
  1175.     (never happens in the current implementation):
  1176.     * eax = -1
  1177.     * ebx, ecx destroyed
  1178.   * if driver is loaded:
  1179.     * eax = 'MDAZ' (in fasm style, that is 'M' - low byte, 'Z' - high)
  1180.       - signature
  1181.     * ebx = current frequency of the scanning (in Hz)
  1182.     * ecx destroyed
  1183.     * buffer pointed to by edx is filled
  1184. Format of the buffer:
  1185.   * +0: 32*byte: driver name, "Trans VideoDriver"
  1186.     (without quotes, supplemented by spaces)
  1187.   * +32 = +0x20: dword: driver version (version x.y is encoded as
  1188.     y*65536+x), for the current implementation is 1 (1.0)
  1189.   * +36 = +0x24: 7*dword: reserved (0 in the current implementation)
  1190.   * +64 = +0x40: 32*word: list of supported videomodes (each word
  1191.     is number of a videomode, after list itself there are zeroes)
  1192.   * +128 = +0x80: 32*(5*word): list of supported frequences of the
  1193.     scannings for videomodes: for each videomode listed in the
  1194.     previous field up to 5 supported frequences are given
  1195.     (unused positions contain zeroes)
  1196. Remarks:
  1197.   * Function initializes the driver (if it is not initialized yet)
  1198.     and must be called first, before others (otherwise they will do
  1199.     nothing and return -1).
  1200.   * The current implementation supports only one frequency
  1201.     of the scanning on videomode.
  1202.  
  1203. ======================================================================
  1204. ============ Function 21, subfunction 13, subsubfunction 2 ===========
  1205. ================ Get information on current videomode. ===============
  1206. ======================================================================
  1207. Parameters:
  1208.   * eax = 21 - function number
  1209.   * ebx = 13 - subfunction number
  1210.   * ecx = 2 - number of the driver function
  1211. Returned value:
  1212.   * eax = -1 - driver is not loaded or not initialized;
  1213.     ebx,ecx are destroyed
  1214.   * eax = [width]*65536 + [height]
  1215.   * ebx = frequency of the vertical scanning (in Hz)
  1216.   * ecx = number of current videomode
  1217. Remarks:
  1218.   * Driver must be initialized by call to
  1219.     driver function 1.
  1220.   * If only screen sizes are required, it is more expedient to use
  1221.     function 14 taking into account that it
  1222.     returns sizes on 1 less.
  1223.  
  1224. ======================================================================
  1225. === Function 21, subfunction 13, subsubfunction 3 - set videomode. ===
  1226. ======================================================================
  1227. Parameters:
  1228.   * eax = 21 - function number
  1229.   * ebx = 13 - subfunction number
  1230.   * ecx = 3 - number of the driver function
  1231.   * edx = [scanning frequency]*65536 + [videomode number]
  1232. Returned value:
  1233.   * eax = -1 - driver is not loaded, not initialized or
  1234.     an error has occured
  1235.   * eax = 0 - success
  1236.   * ebx, ecx destroyed
  1237. Remarks:
  1238.   * Driver must be initialized by driver function 1.
  1239.   * The videomode number and frequency must be in the table
  1240.     returned by driver function 1.
  1241.  
  1242. ======================================================================
  1243. ============ Function 21, subfunction 13, subsubfunction 4 ===========
  1244. ================== Return to the initial videomode. ==================
  1245. ======================================================================
  1246. Returns the screen to the videomode set at system boot.
  1247. Parameters:
  1248.   * eax = 21 - function number
  1249.   * ebx = 13 - subfunction number
  1250.   * ecx = 4 - number of the driver function
  1251. Returned value:
  1252.   * eax = -1 - driver is not loaded or not initialized
  1253.   * eax = 0 - success
  1254.   * ebx, ecx destroyed
  1255. Remarks:
  1256.   * Driver must be initialized by call to driver function 1.
  1257.  
  1258. ======================================================================
  1259. ============ Function 21, subfunction 13, subsubfunction 5 ===========
  1260. ===== Increase/decrease the size of the visible area of monitor. =====
  1261. ======================================================================
  1262. Parameters:
  1263.   * eax = 21 - function number
  1264.   * ebx = 13 - subfunction number
  1265.   * ecx = 5 - number of the driver function
  1266.   * edx = 0/1 - decrease/increase horizontal size on 1 position
  1267.   * edx = 2/3 - is not supported in the current implementation;
  1268.     is planned as decrease/increase vertical size on 1 position
  1269. Returned value:
  1270.   * eax = -1 - driver is not loaded or not initialized
  1271.   * eax = 0 - success
  1272.   * ebx, ecx destroyed
  1273. Remarks:
  1274.   * Driver must be initialized by call to driver function 1.
  1275.   * Function influences only the physical size of the screen image;
  1276.     the logical size (number of pixels) does not change.
  1277.  
  1278. ======================================================================
  1279. ================= Function 22 - set system date/time. ================
  1280. ======================================================================
  1281. Parameters:
  1282.   * eax = 22 - function number
  1283.   * ebx = 0 - set time
  1284.     * ecx = 0x00SSMMHH - time in the binary-decimal code (BCD):
  1285.     * HH=hour 00..23
  1286.     * MM=minute 00..59
  1287.     * SS=second 00..59
  1288.   * ebx = 1 - set date
  1289.     * ecx = 0x00DDMMYY - date in the binary-decimal code (BCD):
  1290.     * DD=day 01..31
  1291.     * MM=month 01..12
  1292.     * YY=year 00..99
  1293.   * ebx = 2 - set day of week
  1294.     * ecx = 1 for Sunday, ..., 7 for Saturday
  1295.   * ebx = 3 - set alarm clock
  1296.     * ecx = 0x00SSMMHH
  1297. Returned value:
  1298.   * eax = 0 - success
  1299.   * eax = 1 - incorrect parameter
  1300.   * eax = 2 - CMOS-battery was unloaded
  1301. Remarks:
  1302.   * Value of installation of day of week seems to be doubtful,
  1303.     as it a little where is used
  1304.     (day of week can be calculated by date).
  1305.   * Alarm clock can be set on operation in the given time every day.
  1306.     But there is no existing system function to disable it.
  1307.   * Operation of alarm clock consists in generation IRQ8.
  1308.   * Generally CMOS supports for alarm clock set of value 0xFF
  1309.     as one of parameters and it means that the appropriate parameter
  1310.     is ignored. But current implementation does not allow this
  1311.     (will return 1).
  1312.   * Alarm clock is a global system resource; the set of
  1313.     an alarm clock cancels automatically the previous set.
  1314.     However, at moment no program uses it.
  1315.  
  1316. ======================================================================
  1317. ============= Function 23 - wait for event with timeout. =============
  1318. ======================================================================
  1319. If the message queue is empty, waits for new message in the queue,
  1320. but no more than given time. Then reads out a message from the queue.
  1321.  
  1322. Parameters:
  1323.   * eax = 23 - function number
  1324.   * ebx = timeout (in 1/100 of second)
  1325. Returned value:
  1326.   * eax = 0 - the message queue is empty
  1327.   * otherwise eax = event (see the list of events)
  1328. Remarks:
  1329.   * Only those events are taken into account, which enter into
  1330.     the mask set by function 40. By default it is
  1331.     redraw, key and button events.
  1332.   * To check for presence of a message in the queue use function 11.
  1333.     To wait without timeout use function 10.
  1334.   * Transmission ebx=0 results in immediate returning eax=0.
  1335.   * Current implementation returns immediately with eax=0,
  1336.     if the addition of ebx with the current value of time counter
  1337.     makes 32-bit overflow.
  1338.  
  1339. ======================================================================
  1340. ======== Function 24, subfunction 1 - begin to play CD-audio. ========
  1341. ======================================================================
  1342. Parameters:
  1343.   * eax = 24 - function number
  1344.   * ebx = 1 - subfunction number
  1345.   * ecx = 0x00FRSSMM, where
  1346.     * MM = starting minute
  1347.     * SS = starting second
  1348.     * FR = starting frame
  1349. Returned value:
  1350.   * eax = 0 - success
  1351.   * eax = 1 - CD base is not defined
  1352. Remarks:
  1353.   * Previously CD base must be defined by the call to
  1354.     subfunction 3 of function 21.
  1355.   * One second includes 75 frames, one minute includes 60 seconds.
  1356.   * The function is asynchronous (returns control, when play begins).
  1357.  
  1358. ======================================================================
  1359. ======= Function 24, subfunction 2 - get information on tracks. ======
  1360. ======================================================================
  1361. Parameters:
  1362.   * eax = 24 - function number
  1363.   * ebx = 2 - subfunction number
  1364.   * ecx = pointer to the buffer for the table
  1365.     (maximum 8*64h+4 bytes=100 tracks)
  1366. Returned value:
  1367.   * eax = 0 - success
  1368.   * eax = 1 - CD base is not defined
  1369. Remarks:
  1370.   * The format of the table with tracks information is the same as
  1371.     for ATAPI-CD command 43h (READ TOC), usual table (subcommand 00h).
  1372.     Function returns addresses in MSF.
  1373.   * Previously CD base port must be set by call to
  1374.     subfunction 3 of function 21.
  1375.   * Function returns information only about no more than 100
  1376.     first tracks. In most cases it is enough.
  1377.  
  1378. ======================================================================
  1379. ========== Function 24, subfunction 3 - stop play CD-audio. ==========
  1380. ======================================================================
  1381. Parameters:
  1382.   * eax = 24 - function number
  1383.   * ebx = 1 - subfunction number
  1384. Returned value:
  1385.   * eax = 0 - success
  1386.   * eax = 1 - CD base is not defined
  1387. Çàìå÷àíèÿ:
  1388.   * Previously CD base port must be defined by call to
  1389.     subfunction 3 of function 21.
  1390.  
  1391. ======================================================================
  1392. =================== Function 25 - set SBPro volume. ==================
  1393. ======================================================================
  1394. Parameters:
  1395.   * eax = 25 - function number
  1396.   * ebx = what to set:
  1397.     * 1 - set common volume
  1398.     * 2 - set CD-audio volume
  1399.   * cl = volume level: high 4 bits for the left column,
  1400.     low 4 bits for the right one
  1401. Returned value:
  1402.   * eax = 0 - success
  1403.   * eax = 1 - SB base is not defined
  1404.   * eax = 2 - incorrect subfunction
  1405. Remarks:
  1406.   * Previously SB base port must be defined by
  1407.     subfunction 4 of function 21.
  1408.   * See also function 28 which sets
  1409.     volume for the later standard SB16.
  1410.  
  1411. ======================================================================
  1412. ======== Function 26, subfunction 1 - get MPU MIDI base port. ========
  1413. ======================================================================
  1414. Parameters:
  1415.   * eax = 26 - function number
  1416.   * ebx = 1 - subfunction number
  1417. Returned value:
  1418.   * eax = port number
  1419. Parameters:
  1420.   * To set base port use subfunction 1 of function 21.
  1421.  
  1422. ======================================================================
  1423. ========== Function 26, subfunction 2 - get keyboard layout. =========
  1424. ======================================================================
  1425. The keyboard layout is used to convert keyboard scancodes to
  1426. ASCII-codes for function 2.
  1427. Parameters:
  1428.   * eax = 26 - function number
  1429.   * ebx = 2 - subfunction number
  1430.   * ecx = what layout to get:
  1431.     * 1 = normal layout
  1432.     * 2 = layout with pressed Shift
  1433.     * 3 = layout with pressed Alt
  1434.   * edx = pointer to the 128-bytes buffer, where the layout will be
  1435.     copied
  1436. Returned value:
  1437.   * function does not return value
  1438. Or:
  1439.   * eax = 26 - function number
  1440.   * ebx = 2 - subfunction number
  1441.   * ecx = 9
  1442. Returned value:
  1443.   * eax = country identifier (1=eng, 2=fi, 3=ger, 4=rus)
  1444. Remarks:
  1445.   * If Alt is pressed, the layout with Alt is used;
  1446.     if Alt is not pressed, but Shift is pressed,
  1447.     the layout with Shift is used;
  1448.     if Alt and Shift are not pressed, but Ctrl is pressed, the normal
  1449.     layout is used and then from the code is subtracted 0x60;
  1450.     if no control key is pressed, the normal layout is used.
  1451.   * To set layout and country identifier use
  1452.     subfunction 2 of function 21.
  1453.   * Country identifier is global system variable, which is not used
  1454.     by the kernel itself; however the application '@panel' displays
  1455.     the corresponding icon (using this function).
  1456.   * The application @panel switches layouts on user request.
  1457.  
  1458. ======================================================================
  1459. ============== Function 26, subfunction 3 - get CD base. =============
  1460. ======================================================================
  1461. Parameters:
  1462.   * eax = 26 - function number
  1463.   * ebx = 3 - subfunction number
  1464. Returned value:
  1465.   * eax = CD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1466. Remarks:
  1467.   * CD base is used by function 24.
  1468.   * To set CD base use subfunction 3 of function 21.
  1469.  
  1470. ======================================================================
  1471. ====== Function 26, subfunction 4 - get Sound Blaster base port. =====
  1472. ======================================================================
  1473. Parameters:
  1474.   * eax = 26 - function number
  1475.   * ebx = 4 - subfunction number
  1476. Returned value:
  1477.   * eax = base port number
  1478. Remarks:
  1479.   * Bae port is used by functions 25, 55.
  1480.   * To set base port use subfunction 4 of function 21.
  1481.  
  1482. ======================================================================
  1483. ========== Function 26, subfunction 5 - get system language. =========
  1484. ======================================================================
  1485. Parameters:
  1486.   * eax = 26 - function number
  1487.   * ebx = 5 - subfunction number
  1488. Returned value:
  1489.   * eax = system language (1=eng, 2=fi, 3=ger, 4=rus)
  1490. Remarks:
  1491.   * System language is global system variable and is not used
  1492.     by the kernel itself, however application @panel draws the
  1493.     appropriate icon (using this function).
  1494.   * To set system language use subfunction 5 of function 21.
  1495.  
  1496. ======================================================================
  1497. =========== Function 26, subfunction 6 - get WSS base port. ==========
  1498. ======================================================================
  1499. Parameters:
  1500.   * eax = 26 - function number
  1501.   * ebx = 6 - subfunction number
  1502. Returned value:
  1503.   * eax = base port
  1504. Remarks:
  1505.   * WSS base is used by function 27.
  1506.   * To set WSS base port use subfunction 6 of function 21.
  1507.  
  1508. ======================================================================
  1509. ============== Function 26, subfunction 7 - get HD base. =============
  1510. ======================================================================
  1511. The HD base defines hard disk to write with usage of obsolete
  1512. file system functions and functions implicitly using the hard disk
  1513. (such as subfunction 6 of function 18);
  1514. at usage of function 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1515. these function set base themselves.
  1516. Parameters:
  1517.   * eax = 26 - function number
  1518.   * ebx = 7 - subfunction number
  1519. Returned value:
  1520.   * eax = HD base: 1=IDE0, 2=IDE1, 3=IDE2, 4=IDE3
  1521. Remarks:
  1522.   * Any application in any time can change HD base.
  1523.   * To set base use subfunction 7 of function 21.
  1524.   * To get used partition of hard disk use subfunction 8.
  1525.  
  1526. ======================================================================
  1527. ========= Function 26, subfunction 8 - get used HD partition. ========
  1528. ======================================================================
  1529. The HD partition defines partition of the hard disk to write with
  1530. usage of obsolete file system functions and functions implicitly
  1531. using the hard disk (such as subfunction 6 of function 18);
  1532. at usage of functions 58 and 70 and modern syntax /HD0,/HD1,/HD2,/HD3
  1533. these functions set base and partition themselves.
  1534. Parameters:
  1535.   * eax = 26 - function number
  1536.   * ebx = 8 - subfunction number
  1537. Returned value:
  1538.   * eax = HD partition (beginning from 1)
  1539. Remarks:
  1540.   * Any application in any time can change partition.
  1541.   * To set partition use subfunction 8 of function 21.
  1542.   * To get number of partitions on a hard disk use
  1543.     subfunction 11 of function 18.
  1544.   * To get base of used hard disk, use subfunction 7.
  1545.  
  1546. ======================================================================
  1547. === Function 26, subfunction 9 - get the value of the time counter. ==
  1548. ======================================================================
  1549. Parameters:
  1550.   * eax = 26 - function number
  1551.   * ebx = 9 - subfunction number
  1552. Returned value:
  1553.   * eax = number of 1/100s of second, past from the system boot time
  1554. Remarks:
  1555.   * Counter takes modulo 2^32, that correspond to a little more
  1556.     than 497 days.
  1557.   * To get system time use function 3.
  1558.  
  1559. ======================================================================
  1560. ======== Function 26, subfunction 10 - get sound DMA channel. ========
  1561. ======================================================================
  1562. Parameters:
  1563.   * eax = 26 - function number
  1564.   * ebx = 10 - subfunction number
  1565. Returned value:
  1566.   * eax = number of the channel (from 0 to 3 inclusive)
  1567. Remarks:
  1568.   * Number of the DMA channel is used by subfunction 1 of function 55.
  1569.   * To set the sound DMA channel use subfunction 10 of function 21.
  1570.  
  1571. ======================================================================
  1572. ===================== Function 26, subfunction 11 ====================
  1573. ========== Find out whether low-level HD access is enabled. ==========
  1574. ======================================================================
  1575. Parameters:
  1576.   * eax = 26 - function number
  1577.   * ebx = 11 - subfunction number
  1578. Returned value:
  1579.   * eax = 0/1 - disabled/enabled
  1580. Remarks:
  1581.   * Is used in LBA read (subfunction 8 of function 58).
  1582.   * To set current state use subfunction 11 of function 21.
  1583.  
  1584. ======================================================================
  1585. ===================== Function 26, subfunction 12 ====================
  1586. ========== Find out whether low-level PCI access is enabled. =========
  1587. ======================================================================
  1588. Parameters:
  1589.   * eax = 26 - function number
  1590.   * ebx = 12 - subfunction number
  1591. Returned value:
  1592.   * eax = 0/1 - disabled/enabled
  1593. Remarks:
  1594.   * Is used by operations with PCI bus (function 62).
  1595.   * The current implementation uses only low bit of ecx.
  1596.   * To set the current state use subfunction 12 of function 21.
  1597.  
  1598. ======================================================================
  1599. ======== Function 27 - set Windows Sound System (WSS) volume. ========
  1600. ======================================================================
  1601. Parameters:
  1602.   * eax = 27 - function number
  1603.   * ebx = what to set:
  1604.     * 1 - set common volume
  1605.     * 2 - set Line In volume
  1606.   * cl = volume level (0x0=highest, 0x1F=lowest,
  1607.     if bit 0x80 is set=disable)
  1608. Returned value:
  1609.   * eax = 0 - success
  1610.   * eax = 1 - WSS base is not defined
  1611.   * eax = 2 - incorrect subfunction
  1612. Remarks:
  1613.   * Previously WSS base port must be defined by call to
  1614.     subfunction 6 of function 21.
  1615.   * Set of common volume is ignored (function simply returns eax=0).
  1616.   * Old documentation and kernel sources erraticly name function 2
  1617.     as CD-audio volume.
  1618.  
  1619. ======================================================================
  1620. =================== Function 28 - set SB16 volume. ===================
  1621. ======================================================================
  1622. Parameters:
  1623.   * eax = 28 - function number
  1624.   * ebx = what to install:
  1625.     * 1 - install common volume
  1626.     * 2 - install CD-audio volume
  1627.   * cl = volume level (0=off, 0xFF=max)
  1628. Returned value:
  1629.   * eax = 0 - success
  1630.   * eax = 1 - SB base is not defined
  1631.   * eax = 2 - incorrect subfunction
  1632. Remarks:
  1633.   * Previously SB base port must be defined by
  1634.     subfunction 4 of function 21.
  1635.   * This function gives more variants for volume, that function 25.
  1636.  
  1637. ======================================================================
  1638. =================== Function 29 - get system date. ===================
  1639. ======================================================================
  1640. Parameters:
  1641.   * eax = 29 - function number
  1642. Returned value:
  1643.   * eax = 0x00DDMMYY, where
  1644.     (binary-decimal coding, BCD, is used)
  1645.   * YY = two low digits of year (00..99)
  1646.   * MM = month (01..12)
  1647.   * DD = day (01..31)
  1648. Remarks:
  1649.   * To set system date use function 22.
  1650.  
  1651. ======================================================================
  1652. =============== Function 32 - delete file from ramdisk. ==============
  1653. ======================================================================
  1654. Parameters:
  1655.   * eax = 32 - function number
  1656.   * ebx = pointer to the filename
  1657. Returned value:
  1658.   * eax = 0 - success; otherwise file system error code
  1659. Remarks:
  1660.   * This function is obsolete; function 58 allows to fulfill
  1661.     the same operations with the extended possibilities.
  1662.   * The current implementation returns only values 0(success) and
  1663.     5(file not found).
  1664.   * The filename must be either in the format 8+3 characters
  1665.     (first 8 characters - name itself, last 3 - extension,
  1666.     the short names and extensions are supplemented with spaces),
  1667.     or in the format 8.3 characters "FILE.EXT"/"FILE.EX "
  1668.     (name no more than 8 characters, dot, extension 3 characters
  1669.     supplemented if necessary by spaces).
  1670.     The filename must be written with capital letters. The terminating
  1671.     character with code 0 is not necessary (not ASCIIZ-string).
  1672.   * This function does not support folders on the ramdisk.
  1673.  
  1674. ======================================================================
  1675. ================ Function 33 - write file to ramdisk. ================
  1676. ======================================================================
  1677. Parameters:
  1678.   * eax = 33 - function number
  1679.   * ebx = pointer to the filename
  1680.   * ecx = pointer to data for writing
  1681.   * edx = number of bytes for writing
  1682.   * should be set esi=0
  1683. Returned value:
  1684.   * eax = 0 - success, otherwise file system error code
  1685. Remarks:
  1686.   * This function is obsolete; function 70 allows to fulfil
  1687.     the same operations with extended possibilities.
  1688.   * If esi contains non-zero value and selected file already exists,
  1689.     one more file with the same name will be created.
  1690.   * Otherwise file will be overwritten.
  1691.   * The filename must be either in the format 8+3 characters
  1692.     (first 8 characters - name itself, last 3 - extension,
  1693.     the short names and extensions are supplemented with spaces),
  1694.     or in the format 8.3 characters "FILE.EXT"/"FILE.EX "
  1695.     (name no more than 8 characters, dot, extension 3 characters
  1696.     supplemented if necessary by spaces).
  1697.     The filename must be written with capital letters. The terminating
  1698.     character with code 0 is not necessary (not ASCIIZ-string).
  1699.   * This function does not support folders on the ramdisk.
  1700.  
  1701. ======================================================================
  1702. ======= Function 35 - read the color of a pixel on the screen. =======
  1703. ======================================================================
  1704. Parameters:
  1705.   * eax = 35
  1706.   * ebx = y*xsize+x, where
  1707.   * (x,y) = coordinates of a pixel (beginning from 0)
  1708.   * xsize = horizontal screen size
  1709. Returned value:
  1710.   * eax = color 0x00RRGGBB
  1711. Remarks:
  1712.   * To get screen sizes use function 14. Pay attention,
  1713.     that it subtracts 1 from both sizes.
  1714.   * There is also direct access (without any system calls)
  1715.     to videomemory through the selector gs. To get parameters of
  1716.     the current videomode, use function 61.
  1717.  
  1718. ======================================================================
  1719. ========= Function 37 - get coordinates/status of the mouse. =========
  1720. ======================================================================
  1721.  
  1722. ---------- Subfunction 0 - screen coordinates of the mouse -----------
  1723. Parameters:
  1724.   * eax = 37 - function number
  1725.   * ebx = 0 - subfunction number
  1726. Returned value:
  1727.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1728.     (beginning from 0)
  1729.  
  1730. -- Subfunction 1 - coordinates of the mouse relative to the window ---
  1731. Parameters:
  1732.   * eax = 37 - function number
  1733.   * ebx = 1 - subfunction number
  1734. Returned value:
  1735.   * eax = x*65536 + y, (x,y)=coordinates of the mouse pointer
  1736.     relative to the application window (beginning from 0)
  1737. Remarks:
  1738.   * The value is calculated by formula (x-xwnd)*65536 + (y-ywnd).
  1739.     If y>=ywnd, the low word is non-negative and contains
  1740.     relative y-coordinate, and the high word - relative x-coordinate
  1741.     (with correct sign). Otherwise the low word is negative and still
  1742.     contains relative y-coordinate, and to the high word
  1743.     1 should be added.
  1744.  
  1745. ------------ Subfunction 2 - pressed buttons of the mouse ------------
  1746. Parameters:
  1747.   * eax = 37 - function number
  1748.   * ebx = 2 - subfunction number
  1749. Returned value:
  1750.   * eax contains information on the pressed mouse buttons:
  1751.   * bit 0 is set = left button is pressed
  1752.   * bit 1 is set = right button is pressed
  1753.   * other bits are cleared
  1754.  
  1755. ======================================================================
  1756. ====================== Function 38 - draw line. ======================
  1757. ======================================================================
  1758. Parameters:
  1759.   * eax = 38 - function number
  1760.   * ebx = [start coordinate on axis x]*65536 +
  1761.               [end coordinate on axis x]
  1762.   * ecx = [start coordinate on axis y]*65536 +
  1763.               [end coordinate on axis y]
  1764.   * edx = 0x00RRGGBB - color
  1765. Returned value:
  1766.   * function does not return value
  1767. Remarks:
  1768.   * Coordinates are relative to the window.
  1769.   * End point is also drawn.
  1770.  
  1771. ======================================================================
  1772. == Function 39, subfunction 1 - get a size of the background image. ==
  1773. ======================================================================
  1774. Parameters:
  1775.   * eax = 39 - function number
  1776.   * ebx = 1 - subfunction number
  1777. Returned value:
  1778.   * eax = [width]*65536 + [height]
  1779. Remarks:
  1780.   * There is a pair function to set sizes of background image -
  1781.     subfunction 1 of function 15. After which it is necessary,
  1782.     of course, anew to define image.
  1783.  
  1784. ======================================================================
  1785. == Function 39, subfunction 2 - get pixel from the background image. =
  1786. ======================================================================
  1787. Parameters:
  1788.   * eax = 39 - function number
  1789.   * ebx = 2 - subfunction number
  1790.   * ecx = offset
  1791. Returned value:
  1792.   * eax = 0x00RRGGBB - pixel color, if offset is valid
  1793.     (less than 0x160000-16)
  1794.   * eax = 2 otherwise
  1795. Remarks:
  1796.   * Do not rely on returned value for invalid offsets, it may be
  1797.     changed in future kernel versions.
  1798.   * Offset for pixel with coordinates (x,y)
  1799.     is calculated as (x+y*xsize)*3.
  1800.   * There is a pair function to set pixel on the background image -
  1801.     subfunction 2 of function 15.
  1802.  
  1803. ======================================================================
  1804. == Function 39, subfunction 4 - get drawing mode for the background. =
  1805. ======================================================================
  1806. Parameters:
  1807.   * eax = 39 - function number
  1808.   * ebx = 4 - subfunction number
  1809. Returned value:
  1810.   * eax = 1 - tile
  1811.   * eax = 2 - stretch
  1812. Remarks:
  1813.   * There is a pair function to set drawing mode -
  1814.     subfunction 4 of function 15.
  1815.  
  1816. ======================================================================
  1817. =========== Function 40 - set the mask for expected events. ==========
  1818. ======================================================================
  1819. The mask for expected events affects function working with events
  1820. 10, 11, 23 - they notify only about events allowed by this mask.
  1821. Parameters:
  1822.   * eax = 40 - function number
  1823.   * ebx = mask: bit i corresponds to event i+1 (see list of events)
  1824.     (set bit permits notice on event)
  1825. Returned value:
  1826.   * function does not return value
  1827. Remarks:
  1828.   * Default mask (7=111b) enables nofices about redraw,
  1829.     keys and buttons. This is enough for many applications.
  1830.   * Events prohibited in the mask are saved anyway, when come;
  1831.     they are simply not informed with event functions.
  1832.   * Event functions take into account the mask on moment of
  1833.     function call, not on moment of event arrival.
  1834.  
  1835. ======================================================================
  1836. ==================== Function 41 - get IRQ owner. ====================
  1837. ======================================================================
  1838. Parameters:
  1839.   * eax = 41 - function number
  1840.   * ebx = IRQ number, 0..15
  1841. Returned value:
  1842.   * eax = owner PID
  1843.   * eax = 0, if there is no owner
  1844.   * eax = -1 for incorrect ebx
  1845.  
  1846. ======================================================================
  1847. ==================== Function 42 - read IRQ data. ====================
  1848. ======================================================================
  1849. When an IRQ occurs, the system reads data from ports indicated
  1850. earlier by function 44 and writes this data to
  1851. internal buffer. This function reads out data from that buffer
  1852. bytewise.
  1853. Parameters:
  1854.   * eax = 42 - function number
  1855.   * ebx = IRQ number, 0..15
  1856. Returned value: (use value of ecx to distinguish)
  1857.   * if the thread is not IRQ owner (or IRQ number is incorrect):
  1858.     * ecx = 2
  1859.   * if there is no data:
  1860.     * eax = 0
  1861.     * ecx = 1
  1862.     * ebx destroyed
  1863.   * if all is ok:
  1864.     * eax = byte size of data, not yet read from buffer
  1865.     * ecx = 0
  1866.     * ebx = current byte
  1867. Remarks:
  1868.   * Previously the thread must reserve indicated IRQ for itself
  1869.     by function 45.
  1870.   * The size of data buffer is 4000 bytes, on overflow
  1871.     "fresh" data cease to be written in the buffer.
  1872.  
  1873. ======================================================================
  1874. ================ Function 43 - input/output to a port. ===============
  1875. ======================================================================
  1876.  
  1877. ------------------------ Output data to port -------------------------
  1878. Parameters:
  1879.   * eax = 43 - function number
  1880.   * bl = byte for output
  1881.   * ecx = port number 0xnnnn (from 0 to 0xFFFF)
  1882. Returned value:
  1883.   * eax = 0 - success
  1884.   * eax = 1 - the thread has not reserved the selected port
  1885.  
  1886. ------------------------ Input data from port ------------------------
  1887. Parameters:
  1888.   * eax = 43 - function number
  1889.   * ebx is ignored
  1890.   * ecx = 0x8000nnnn, where nnnn = port number (from 0 to 0xFFFF)
  1891. Returned value:
  1892.   * eax = 0 - success, thus ebx = entered byte
  1893.   * eax = 1 - the thread has not reserved the selected port
  1894. Remarks:
  1895.   * Previously the thread must reserve the selected port
  1896.     for itself by function 46.
  1897.   * Instead of call to this function it is better to use
  1898.     processor instructions in/out - this is much
  1899.     faster and a bit shorter and easier.
  1900.  
  1901. ======================================================================
  1902. =========== Function 44 - define operations at IRQ arrival. ==========
  1903. ======================================================================
  1904. At IRQ arrival the system can read the data from ports defined
  1905. by this function and write these data to internal buffer, whence
  1906. they can be read by ôóíêöèåé 42.
  1907. Parameters:
  1908.   * eax = 44 - function number
  1909.   * ebx = pointer to the array of structures each describing one port:
  1910.     * +0: word: 0 means end of array, otherwise port number
  1911.     * +2: byte: reserved (ignored)
  1912.     * +3: byte: 1=read byte from this port, 2=read word
  1913.   * ecx = IRQ number, 0..15
  1914. Returned value:
  1915.   * eax = 0 - success
  1916.   * eax = 1 - the thread is not owner of selected IRQ
  1917. Remarks:
  1918.   * Previously the thread must reserve for itself selected IRQ
  1919.     by function 45.
  1920.   * First 16 ports are considered only.
  1921.   * The current implementation considers incorrect value of field +3
  1922.     as a signal to terminate IRQ processing.
  1923.  
  1924. ======================================================================
  1925. =================== Function 45 - reserve/free IRQ. ==================
  1926. ======================================================================
  1927. Parameters:
  1928.   * eax = 45 - function number
  1929.   * ebx = 0 - reserve, 1 = free
  1930.   * ecx = IRQ number, 0..15
  1931. Returned value:
  1932.   * eax = 0 - success
  1933.   * eax = 1 - error (invalid IRQ number
  1934.     or attempt to reserve not free IRQ
  1935.     or to free IRQ, not reserved by this thread)
  1936. Remarks:
  1937.   * IRQ reservation is required for functions 42 and 44.
  1938.   * Only one thread can reserve the specific IRQ.
  1939.   * IRQs, handled by the system itself, are reserved by the system
  1940.     (thread 1) at booting.
  1941.   * When a thread terminates, all reserved by it IRQs
  1942.     are freed automatically.
  1943.  
  1944. ======================================================================
  1945. ====== Function 46 - reserve/free a group of input/output ports. =====
  1946. ======================================================================
  1947. To work with reserved ports an application can access directly by
  1948. commands in/out (recommended way) and can use function 43
  1949. (not recommended way).
  1950. Parameters:
  1951.   * eax = 46 - function number
  1952.   * ebx = 0 - reserve, 1 - free
  1953.   * ecx = start port number
  1954.   * edx = end port number (inclusive)
  1955. Returned value:
  1956.   * eax = 0 - success
  1957.   * eax = 1 - error
  1958. Remarks:
  1959.   * For ports reservation: an error occurs if and only if
  1960.     one from the following condition satisfies:
  1961.     * start port is more than end port;
  1962.     * the selected range contains incorrect port number
  1963.       (correct are from 0 to 0xFFFF);
  1964.     * limit for the total number of reserved areas is exceeded
  1965.       (maximum 255 are allowed);
  1966.     * the selected range intersects with any of earlier reserved
  1967.   * For ports free: an error is an attempt to free range,
  1968.     that was not earlier reserved by this function
  1969.     (with same ecx,edx).
  1970.   * If an error occurs (for both cases) function performs no action.
  1971.   * At booting the system reserves for itself ports 0..0xff, and if
  1972.     COM-mouse is detected - additionally range of COM-ports
  1973.     0x3f0..0x3ff and/or 0x2f0..0x2ff.
  1974.   * When a thread terminates, all reserved by it ports
  1975.     are freed automatically.
  1976.  
  1977. ======================================================================
  1978. ============= Function 47 - draw a number in the window. =============
  1979. ======================================================================
  1980. Parameters:
  1981.   * eax = 47 - function number
  1982.   * ebx = parameters of conversion number to text:
  1983.     * bl = 0 - ecx contains number
  1984.     * bl = 1 - ecx contains pointer to dword-number
  1985.     * bh = 0 - display in decimal number system
  1986.     * bh = 1 - display in hexadecimal system
  1987.     * bh = 2 - display in binary system
  1988.     * áèòû 16-21 = how many digits to display
  1989.     * áèòû 22-31 reserved and must be set to 0
  1990.   * ecx = number (if bl=0) or pointer (if bl=1)
  1991.   * edx = [coordinate on axis x]*65536 + [coordinate on axis y]
  1992.   * esi = 0xN0RRGGBB, RRGGBB=color, N=font (0/1)
  1993. Returned value:
  1994.   * function does not return value
  1995. Remarks:
  1996.   * The given length must not exceed 60.
  1997.   * The exactly given amount of digits is output. If number is small
  1998.     and can be written by smaller amount of digits, it is supplemented
  1999.     by leading zeroes; if the number is big and can not be written by
  2000.     given amount of digits, extra digits are not drawn.
  2001.   * Parameters of fonts are shown in the description of function 4
  2002.     (text output).
  2003.  
  2004. ======================================================================
  2005. ========= Function 48, subfunction 0 - apply screen settings. ========
  2006. ======================================================================
  2007. Parameters:
  2008.   * eax = 48 - function number
  2009.   * ebx = 0 - subfunction number
  2010.   * ecx = 0 - reserved
  2011. Returned value:
  2012.   * function does not return value
  2013. Remarks:
  2014.   * Function redraws the screen after parameters change by
  2015.     subfunctions 1 and 2.
  2016.   * Function call without prior call to one of indicated subfunctions
  2017.     is ignored.
  2018.   * Function call with nonzero ecx is ignored.
  2019.  
  2020. ======================================================================
  2021. =========== Function 48, subfunction 1 - set button style. ===========
  2022. ======================================================================
  2023. Parameters:
  2024.   * eax = 48 - function number
  2025.   * ebx = 1 - subfunction number
  2026.   * ecx = button style:
  2027.     * 0 = flat
  2028.     * 1 = 3d
  2029. Returned value:
  2030.   * function does not return value
  2031. Remarks:
  2032.   * After call to this function one should redraw the screen by
  2033.     subfunction 0.
  2034.   * Button style influences only to their draw of function 8.
  2035.  
  2036. ======================================================================
  2037. ====== Function 48, subfunction 2 - set standard window colors. ======
  2038. ======================================================================
  2039. Parameters:
  2040.   * eax = 48 - function number
  2041.   * ebx = 2 - subfunction number
  2042.   * ecx = pointer to the color table
  2043.   * edx = size of the color table
  2044.     (must be 40 bytes for future compatibility)
  2045. Format of the color table is shown in description of subfunction 3.
  2046. Returned value:
  2047.   * function does not return value
  2048. Remarks:
  2049.   * After call to this function one should redraw the screen by
  2050.     subfunction 0.
  2051.   * Table of standard colors influences only to applications,
  2052.     which receive this table obviously (by subfunction 3)
  2053.     and use it (specifying colors from it to drawing functions).
  2054.   * Table of standard colors is included in skin and is installed
  2055.     anew with skin installation (by subfunction 8).
  2056.   * Color table can be viewed/changed interactively with
  2057.     the application 'desktop'.
  2058.  
  2059. ======================================================================
  2060. ====== Function 48, subfunction 3 - get standard window colors. ======
  2061. ======================================================================
  2062. Parameters:
  2063.   * eax = 48 - function number
  2064.   * ebx = 3 - subfunction number
  2065.   * ecx = pointer to the buffer with size edx bytes,
  2066.     where table will be written
  2067.   * edx = size of color table
  2068.     (must be 40 bytes for future compatibility)
  2069. Returned value:
  2070.   * function does not return value
  2071. Format of the color table:
  2072. each item is dword-value for color 0x00RRGGBB
  2073.   * +0: dword: frames - color of frame
  2074.   * +4: dword: grab - color of header
  2075.   * +8: dword: grab_button - color of button on header bar
  2076.   * +12 = +0xC: dword: grab_button_text - color of text on button
  2077.     on header bar
  2078.   * +16 = +0x10: dword: grab_text - color of text on header
  2079.   * +20 = +0x14: dword: work - color of working area
  2080.   * +24 = +0x18: dword: work_button - color of button in working area
  2081.   * +28 = +0x1C: dword: work_button_text - color of text on button
  2082.     in working area
  2083.   * +32 = +0x20: dword: work_text - color of text in working area
  2084.   * +36 = +0x24: dword: work_graph - color of graphics in working area
  2085. Remarks:
  2086.   * Structure of the color table is described in the standard
  2087.     include file 'macros.inc' as 'system_colors'; for example,
  2088.     it is possible to write:
  2089.         sc      system_colors           ; variable declaration
  2090.         ...                             ; somewhere one must call
  2091.                                         ; this function with ecx=sc
  2092.         mov     ecx, [sc.work_button_text]      ; read text color on
  2093.                                         ; buttin in working area
  2094.   * A program itself desides to use or not to use color table.
  2095.     For usage program must simply at calls to drawing functions select
  2096.     color taken from the table.
  2097.   * At change of the table of standard colors (by subfunction 2 with
  2098.     the subsequent application of changes by subfunction 0 or
  2099.     at skin set by subfunction 8) the system sends to all windows
  2100.     redraw message (the event with code 1).
  2101.   * Color table can be viewed/changed interactively with
  2102.     the application 'desktop'.
  2103.  
  2104. ======================================================================
  2105. ============ Function 48, subfunction 4 - get skin height. ===========
  2106. ======================================================================
  2107. Parameters:
  2108.   * eax = 48 - function number
  2109.   * ebx = 4 - subfunction number
  2110. Returned value:
  2111.   * eax = skin height
  2112. Remarks:
  2113.   * Skin height is defined as the height of a header
  2114.     of skinned windows.
  2115.   * See also general structure of window in the description
  2116.     of function 0.
  2117.  
  2118. ======================================================================
  2119. ======== Function 48, subfunction 5 - get screen working area. =======
  2120. ======================================================================
  2121. Parameters:
  2122.   * eax = 48 - function number
  2123.   * ebx = 5 - subfunction number
  2124. Returned value:
  2125.   * eax = [left]*65536 + [right]
  2126.   * ebx = [top]*65536 + [bottom]
  2127. Remarks:
  2128.   * The screen working area defines position and coordinates of
  2129.     a maximized window.
  2130.   * The screen working area in view of normal work is all screen
  2131.     without system panel (the application '@panel').
  2132.   * (left,top) are coordinates of the left upper corner,
  2133.     (right,bottom) are coordinates of the right lower one.
  2134.     Thus the size of working area on x axis can be calculated by
  2135.     formula right-left+1, on y axis - by formula bottom-right+1.
  2136.   * See also function 14,
  2137.     to get sizes of all screen.
  2138.   * There is a pair function to set working area - subfunction 6.
  2139.  
  2140. ======================================================================
  2141. ======== Function 48, subfunction 6 - set screen working area. =======
  2142. ======================================================================
  2143. Parameters:
  2144.   * eax = 48 - function number
  2145.   * ebx = 6 - subfunction number
  2146.   * ecx = [left]*65536 + [right]
  2147.   * edx = [top]*65536 + [bottom]
  2148. Returned value:
  2149.   * function does not return value
  2150. Remarks:
  2151.   * The screen working area defines position and coordinates of
  2152.     a maximized window.
  2153.   * This function is used only by the application '@panel',
  2154.     which set working area to all screen without system panel.
  2155.   * (left,top) are coordinates of the left upper corner,
  2156.     (right,bottom) are coordinates of the right lower one.
  2157.     Thus the size of working area on x axis can be calculated by
  2158.     formula right-left+1, on y axis - by formula bottom-right+1.
  2159.   * If 'left'>='right', x-coordinate of working area is not changed.
  2160.     If 'left'<0, 'left' will not be set. If 'right' is greater than or
  2161.     equal to screen width, 'right' will not be set.
  2162.     Similarly on y axis.
  2163.   * See also function 14,
  2164.     to get sizes of all screen.
  2165.   * There is a pair function to get working area - subfunction 5.
  2166.   * This function redraws the screen automatically,
  2167.     updating coordinates and sizes of maximized windows.
  2168.     The system sends to all windows redraw message (the event 1).
  2169.  
  2170. ======================================================================
  2171. =========== Function 48, subfunction 7 - get skin margins. ===========
  2172. ======================================================================
  2173. Returns the area of a header of a skinned window, intended for
  2174. a text of a header.
  2175. Parameters:
  2176.   * eax = 48 - function number
  2177.   * ebx = 7 - subfunction number
  2178. Returned value:
  2179.   * eax = [left]*65536 + [right]
  2180.   * ebx = [top]*65536 + [bottom]
  2181. Remarks:
  2182.   * An application decides itself to use or not to use this function.
  2183.   * It is recommended to take into account returned value
  2184.     of this function for choice of a place for drawing header text
  2185.     (by function 4) or a substitute of header text
  2186.     (at the discretion of an application).
  2187.  
  2188. ======================================================================
  2189. ============= Function 48, subfunction 8 - set used skin. ============
  2190. ======================================================================
  2191. Parameters:
  2192.   * eax = 48 - function number
  2193.   * ebx = 8 - subfunction number
  2194.   * ecx = pointer to a block for function 58, in
  2195.     which the fields of intermediate buffer and file name are filled
  2196. Returned value:
  2197.   * eax = 0 - success
  2198.   * otherwise eax = file system error code; if file does not
  2199.     contain valid skin, function returns error 3
  2200.     (unknown file system).
  2201. Remarks:
  2202.   * After successful skin loading the system sends to all windows
  2203.     redraw message (the event 1).
  2204.   * At booting the system reads skin from file 'default.skn'
  2205.     on ramdisk.
  2206.   * User can change the skin statically by creating hisself
  2207.     'default.skn' or dynamically with the application 'desktop'.
  2208.  
  2209. ======================================================================
  2210. =========== Function 49 - Advanced Power Management (APM). ===========
  2211. ======================================================================
  2212. Parameters:
  2213.   * eax = 49 - function number
  2214.   * dx = number of the APM function
  2215.     (analogue of ax in APM specification)
  2216.   * bx, cx = parameters of the APM function
  2217. Returned value:
  2218.   * 16-bit registers ax, bx, cx, dx, si, di and carry flag CF
  2219.     are set according to the APM specification
  2220.   * high halves of 32-bit registers eax, ebx, ecx,
  2221.     edx, esi, edi are destroyed
  2222. Remarks:
  2223.   * APM 1.2 specification is described in the document
  2224.     "Advanced Power Management (APM) BIOS Specification"
  2225.     (Revision 1.2), available at
  2226.     http://www.microsoft.com/whdc/archive/amp_12.mspx;
  2227.     besides it is included in famous Interrupt List by Ralf Brown
  2228.     (http://www.pobox.com/~ralf/files.html,
  2229.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/).
  2230.  
  2231. ======================================================================
  2232. =================== Function 50 - set window shape. ==================
  2233. ======================================================================
  2234. Normal windows have rectangular shape. This function can give to
  2235. a window any shape. The shape is given by a set of points inside
  2236. the base rectangle belonging to a window. Position and coordinates
  2237. of the base rectangle are set by function 0
  2238. and changed by function 67.
  2239.  
  2240. --------------------------- Set shape data ---------------------------
  2241. Parameters:
  2242.   * eax = 50 - function number
  2243.   * ebx = 0 - subfunction number
  2244.   * ecx = pointer to shape data (array of bytes 0/1)
  2245. Returned value:
  2246.   * function does not return value
  2247.  
  2248. -------------------------- Set shape scale ---------------------------
  2249. Parameters:
  2250.   * eax = 50 - function number
  2251.   * ebx = 1 - subfunction number
  2252.   * ecx sets a scale: each byte of data defines
  2253.     (2^scale)*(2^scale) pixels
  2254. Returned value:
  2255.   * function does not return value
  2256. Remarks:
  2257.   * Default scale is 0 (scale factor is 1). If in the shape data
  2258.     one byte corresponds to one pixel, there is no necessity
  2259.     to set scale.
  2260.   * Let's designate xsize = window width (in pixels), ysize = height;
  2261.     pay attention, that they are one pixel more than defined by
  2262.     functions 0, 67.
  2263.   * On definition of scale xsize and ysize must be divisible
  2264.     on 2^scale.
  2265.   * Byte of data on offset 'a' must be 0/1 and defines belonging
  2266.     to a window of square with the side 2^scale (if scale=0,
  2267.     this is one pixel) and coordinates of the left upper corner
  2268.     (a mod (xsize shr scale), a div (xsize shr scale))
  2269.   * Data size: (xsize shr scale)*(ysize shr scale).
  2270.   * Data must be presented in the memory and not change
  2271.     after set of shape.
  2272.   * The system views the shape data at every window redraw by
  2273.     function 0.
  2274.   * The call of subfunction 0 with NULL pointer results in return
  2275.     to the rectangular shape.
  2276.  
  2277. ======================================================================
  2278. ==================== Function 51 - create thread. ====================
  2279. ======================================================================
  2280. Parameters:
  2281.   * eax = 51 - function number
  2282.   * ebx = 1 - unique subfunction
  2283.   * ecx = address of thread entry point (starting eip)
  2284.   * edx = pointer to thread stack (starting esp)
  2285. Returned value:
  2286.   * eax = -1 - error (there is too many threads)
  2287.   * otherwise eax = TID - thread identifier
  2288.     </UL>    
  2289.  
  2290. ======================================================================
  2291. === Function 52, subfunction 0 - get network driver configuration. ===
  2292. ======================================================================
  2293. Parameters:
  2294.   * eax = 52 - function number
  2295.   * ebx = 0 - subfunction number
  2296. Returned value:
  2297.   * eax = configuration dword
  2298. Remarks:
  2299.   * Configuration dword can be set by subfunction 2.
  2300.   * The kernel does not use this variable. The value of this
  2301.     variable and working with it subfunctions 0 and 2 is represented
  2302.     doubtful.
  2303.  
  2304. ======================================================================
  2305. ========= Function 52, subfunction 1 - get local IP-address. =========
  2306. ======================================================================
  2307. Parameters:
  2308.   * eax = 52 - function number
  2309.   * ebx = 1 - subfunction number
  2310. Returned value:
  2311.   * eax = IP-address (4 bytes)
  2312. Remarks:
  2313.   * Local IP-address is set by subfunction 3.
  2314.  
  2315. ======================================================================
  2316. === Function 52, subfunction 2 - set network driver configuration. ===
  2317. ======================================================================
  2318. Parameters:
  2319.   * eax = 52 - function number
  2320.   * ebx = 2 - subfunction number
  2321.   * ecx = configuration dword; if low 7 bits derivate the number 3,
  2322.     function [re-]initializes Ethernet-card, otherwise
  2323.     Ethernet turns off
  2324. Returned value:
  2325.   * if Ethernet-interface is not requested, function returns eax=2,
  2326.     but this can be changed in future kernel versions
  2327.   * if Ethernet-interface is requested, eax=0 means error
  2328.     (absence of Ethernet-card), and nonzero value - success
  2329. Remarks:
  2330.   * Configuration dword can be read by subfunction 0.
  2331.   * The kernel does not use this variable. The value of this
  2332.     variable, subfunction 0 and part of subfunction 2, which set it,
  2333.     is represented doubtful.
  2334.  
  2335. ======================================================================
  2336. ========= Function 52, subfunction 3 - set local IP-address. =========
  2337. ======================================================================
  2338. Parameters:
  2339.   * eax = 52 - function number
  2340.   * ebx = 3 - subfunction number
  2341.   * ecx = IP-address (4 bytes)
  2342. Returned value:
  2343.   * the current implementation returns eax=3, but this can be changed
  2344.     in future versions
  2345. Remarks:
  2346.   * Local IP-address can be get by subfunction 1.
  2347.  
  2348. ======================================================================
  2349. = Function 52, subfunction 6 - add data to the stack of input queue. =
  2350. ======================================================================
  2351. Parameters:
  2352.   * eax = 52 - function number
  2353.   * ebx = 6 - subfunction number
  2354.   * edx = data size
  2355.   * esi = data pointer
  2356. Returned value:
  2357.   * eax = -1 - error
  2358.   * eax = 0 - success
  2359. Remarks:
  2360.   * This function is intended only for slow network drivers
  2361.     (PPP, SLIP).
  2362.   * Data size must not exceed 1500 bytes, though function
  2363.     performs no checks on correctness.
  2364.  
  2365. ======================================================================
  2366.  Function 52, subfunction 8 - read data from the network output queue.
  2367. ======================================================================
  2368. Parameters:
  2369.   * eax = 52 - function number
  2370.   * ebx = 8 - subfunction number
  2371.   * esi = pointer to 1500-byte buffer
  2372. Returned value:
  2373.   * eax = number of read bytes (in the current implementation
  2374.     either 0 = no data or 1500)
  2375.   * data was copied in buffer
  2376. Remarks:
  2377.   * This function is intended only for slow network drivers
  2378.     (PPP, SLIP).
  2379.  
  2380. ======================================================================
  2381. ============ Function 52, subfunction 9 - get gateway IP. ============
  2382. ======================================================================
  2383. Parameters:
  2384.   * eax = 52 - function number
  2385.   * ebx = 9 - subfunction number
  2386. Returned value:
  2387.   * eax = gateway IP (4 bytes)
  2388.  
  2389. ======================================================================
  2390. =========== Function 52, subfunction 10 - get subnet mask. ===========
  2391. ======================================================================
  2392. Parameters:
  2393.   * eax = 52 - function number
  2394.   * ebx = 10 - subfunction number
  2395. Returned value:
  2396.   * eax = subnet mask
  2397.  
  2398. ======================================================================
  2399. ============ Function 52, subfunction 11 - set gateway IP. ===========
  2400. ======================================================================
  2401. Parameters:
  2402.   * eax = 52 - function number
  2403.   * ebx = 11 - subfunction number
  2404.   * ecx = gateway IP (4 bytes)
  2405. Returned value:
  2406.   * the current implementation returns eax=11, but this can be changed
  2407.     in future versions
  2408.  
  2409. ======================================================================
  2410. =========== Function 52, subfunction 12 - set subnet mask. ===========
  2411. ======================================================================
  2412. Parameters:
  2413.   * eax = 52 - function number
  2414.   * ebx = 12 - subfunction number
  2415.   * ecx = subnet mask
  2416. Returned value:
  2417.   * the current implementation returns eax=12, but this can be changed
  2418.     in future versions
  2419.  
  2420. ======================================================================
  2421. ============== Function 52, subfunction 13 - get DNS IP. =============
  2422. ======================================================================
  2423. Parameters:
  2424.   * eax = 52 - function number
  2425.   * ebx = 13 - subfunction number
  2426. Returned value:
  2427.   * eax = DNS IP (4 bytes)
  2428.  
  2429. ======================================================================
  2430. ============== Function 52, subfunction 14 - set DNS IP. =============
  2431. ======================================================================
  2432. Parameters:
  2433.   * eax = 52 - function number
  2434.   * ebx = 14 - subfunction number
  2435.   * ecx = DNS IP (4 bytes)
  2436. Returned value:
  2437.   * the current implementation returns eax=14, but this can be changed
  2438.     in future versions
  2439.  
  2440. ======================================================================
  2441. ============ Function 53, subfunction 0 - open UDP-socket. ===========
  2442. ======================================================================
  2443. Parameters:
  2444.   * eax = 53 - function number
  2445.   * ebx = 0 - subfunction number
  2446.   * ecx = local port (only low word is taken into account)
  2447.   * edx = remote port (only low word is taken into account)
  2448.   * esi = remote IP
  2449. Returned value:
  2450.   * eax = -1 = 0xFFFFFFFF - error; ebx destroyed
  2451.   * eax = socket handle (some number which unambiguously identifies
  2452.     socket and have sense only for the system) - success;
  2453.     ebx destroyed
  2454.  
  2455. ======================================================================
  2456. =========== Function 53, subfunction 1 - close UDP-socket. ===========
  2457. ======================================================================
  2458. Parameters:
  2459.   * eax = 53 - function number
  2460.   * ebx = 1 - subfunction number
  2461.   * ecx = socket handle
  2462. Returned value:
  2463.   * eax = -1 - incorrect handle
  2464.   * eax = 0 - success
  2465.   * ebx destroyed
  2466. Remarks:
  2467.   * The current implementation does not close automatically all
  2468.     sockets of a thread at termination. In particular, one should not
  2469.     kill a thread with many opened sockets - there will be an outflow
  2470.     of resources.
  2471.   * The current implementation does no checks on correctness
  2472.     (function returns error only if thread tries to close not opened
  2473.     socket with correct handle).
  2474.  
  2475. ======================================================================
  2476. ============== Function 53, subfunction 2 - poll socket. =============
  2477. ======================================================================
  2478. Parameters:
  2479.   * eax = 53 - function number
  2480.   * ebx = 2 - subfunction number
  2481.   * ecx = socket handle
  2482. Returned value:
  2483.   * eax = number of read bytes
  2484.   * ebx destroyed
  2485. Remarks:
  2486.   * There is no checks for correctness.
  2487.  
  2488. ======================================================================
  2489. ========= Function 53, subfunction 3 - read byte from socket. ========
  2490. ======================================================================
  2491. Parameters:
  2492.   * eax = 53 - function number
  2493.   * ebx = 3 - subfunction number
  2494.   * ecx = socket handle
  2495. Returned value:
  2496.   * if there is no read data: eax=0, bl=0,
  2497.     other bytes of ebx are destroyed
  2498.   * if there are read data: eax=number of rest bytes
  2499.     (possibly 0), bl=read byte, other bytes of ebx are destroyed
  2500. Remarks:
  2501.   * There is no checks for correctness.
  2502.  
  2503. ======================================================================
  2504. ========== Function 53, subfunction 4 - write to UDP-socket. =========
  2505. ======================================================================
  2506. Parameters:
  2507.   * eax = 53 - function number
  2508.   * ebx = 4 - subfunction number
  2509.   * ecx = socket handle
  2510.   * edx = number of bytes to write
  2511.   * esi = pointer to data to write
  2512. Returned value:
  2513.   * eax = 0xffffffff - invalid handle
  2514.   * eax = 0xffff - not enough memory
  2515.   * eax = 0 - success
  2516.   * ebx destroyed
  2517. Remarks:
  2518.   * Check on validity of handle is minimal - only not very incorrect
  2519.     not opened handles are eliminated.
  2520.   * Number of bytes to write must not exceed 1500-28, though
  2521.     the appropriate check is not made.
  2522.  
  2523. ======================================================================
  2524. ============ Function 53, subfunction 5 - open TCP-socket. ===========
  2525. ======================================================================
  2526. Parameters:
  2527.   * eax = 53 - function number
  2528.   * ebx = 5 - subfunction number
  2529.   * ecx = local port (only low word is taken into account)
  2530.   * edx = remote port (only low word is taken into account)
  2531.   * esi = remote IP
  2532.   * edi = open mode: SOCKET_PASSIVE=0 or SOCKET_ACTIVE=1
  2533. Returned value:
  2534.   * eax = -1 = 0xFFFFFFFF - error; ebx destroys
  2535.   * eax = socket handle (some number which unambiguously identifies
  2536.     socket and have sense only for the system) - success;
  2537.     ebx destroyed
  2538.  
  2539. ======================================================================
  2540. ========= Function 53, subfunction 6 - get TCP-socket status. ========
  2541. ======================================================================
  2542. Parameters:
  2543.   * eax = 53 - function number
  2544.   * ebx = 6 - subfunction number
  2545.   * ecx = socket handle
  2546. Returned value:
  2547.   * eax = socket status: one of
  2548.   * TCB_LISTEN = 1
  2549.   * TCB_SYN_SENT = 2
  2550.   * TCB_SYN_RECEIVED = 3
  2551.   * TCB_ESTABLISHED = 4
  2552.   * TCB_FIN_WAIT_1 = 5
  2553.   * TCB_FIN_WAIT_2 = 6
  2554.   * TCB_CLOSE_WAIT = 7
  2555.   * TCB_CLOSING = 8
  2556.   * TCB_LAST_ASK = 9
  2557.   * TCB_TIME_WAIT = 10
  2558.   * TCB_CLOSED = 11
  2559.   * ebx destroys
  2560. Remarks:
  2561.   * There is no checks for correctness.
  2562.  
  2563. ======================================================================
  2564. ========== Function 53, subfunction 7 - write to TCP-socket. =========
  2565. ======================================================================
  2566. Parameters:
  2567.   * eax = 53 - function number
  2568.   * ebx = 7 - subfunction number
  2569.   * ecx = socket handle
  2570.   * edx = number of bytes to write
  2571.   * esi = pointer to data to write
  2572. Returned value:
  2573.   * eax = 0xffffffff - error
  2574.   * eax = 0xffff - not enough memory
  2575.   * eax = 0 - success
  2576.   * ebx destroyed
  2577. Remarks:
  2578.   * Check on validity of handle is minimal - only not very incorrect
  2579.     not opened handles are eliminated.
  2580.   * Number of bytes to write must not exceed 1500-40, though
  2581.     the appropriate check is not made.
  2582.  
  2583. ======================================================================
  2584. =========== Function 53, subfunction 8 - close TCP-socket. ===========
  2585. ======================================================================
  2586. Parameters:
  2587.   * eax = 53 - function number
  2588.   * ebx = 8 - subfunction number
  2589.   * ecx = socket handle
  2590. Returned value:
  2591.   * eax = -1 - invalid handle
  2592.   * eax = 0xffff - not enough memory for socket close packet
  2593.   * eax = 0 - success
  2594.   * in many cases eax is destroyed (the result of function 'queue'
  2595.     is returned) - probably this is bug, which will be corrected
  2596.   * ebx destroyed
  2597. Remarks:
  2598.   * The current implementation does not close automatically all
  2599.     sockets of a thread at termination. In particular, one should not
  2600.     kill a thread with many opened sockets - there will be an outflow
  2601.     of resources.
  2602.   * The current implementation does no checks on correctness
  2603.     (function returns error only if thread tries to close not opened
  2604.     socket with correct handle).
  2605.  
  2606. ======================================================================
  2607. === Function 53, subfunction 9 - check whether local port is free. ===
  2608. ======================================================================
  2609. Parameters:
  2610.   * eax = 53 - function number
  2611.   * ebx = 9 - subfunction number
  2612.   * ecx = local port number (low 16 bits are used only)
  2613. Returned value:
  2614.   * eax = 0 - port is used
  2615.   * eax = 1 - port is free
  2616.   * ebx destroyed
  2617.  
  2618. ======================================================================
  2619. = Function 53, subfunction 255 - debug information of network driver.
  2620. ======================================================================
  2621. Parameters:
  2622.   * eax = 53 - function number
  2623.   * ebx = 255 - subfunction number
  2624.   * ecx = type of requested information (see below)
  2625. Returned value:
  2626.   * eax = requested information
  2627.   * ebx destroyed
  2628. Possible values for ecx:
  2629.   * 100: length of queue 0 (empty queue)
  2630.   * 101: length of queue 1 (ip-out queue)
  2631.   * 102: length of queue 2 (ip-in queue)
  2632.   * 103: length of queue 3 (net1out queue)
  2633.   * 200: number of items in the ARP table
  2634.   * 201: size of the ARP table (in items) (20 for current version)
  2635.   * 202: read item at edx of the ARP table to the temporary buffer,
  2636.     whence 5 following types take information;
  2637.     in this case eax is not defined
  2638.   * 203: IP-address saved by type 202
  2639.   * 204: high dword of MAC-address saved by type 202
  2640.   * 205: low word of MAC-address saved by type 202
  2641.   * 206: status word saved by type 202
  2642.   * 207: ttl word saved by type 202
  2643.   * 2: total number of received IP-packets
  2644.   * 3: total number of transferred IP-packets
  2645.   * 4: total number of dumped received packets
  2646.   * 5: total number of received ARP-packets
  2647.   * 6: status of packet driver, 0=inactive, nonzero=active
  2648.  
  2649. ======================================================================
  2650. ========== Function 55, subfunction 0 - load data for SB16. ==========
  2651. ======================================================================
  2652. Parameters:
  2653.   * eax = 55 - function number
  2654.   * ebx = 0 - subfunction number
  2655.   * ecx = pointer to data (is copied 64 kilobytes, is used as much as
  2656.     set by subfunction 2)
  2657. Returned value:
  2658.   * function does not return value
  2659. Remarks:
  2660.   * Format and size of data are set by subfunction 2.
  2661.  
  2662. ======================================================================
  2663. ======== Function 55, subfunction 1 - begin play data on SB16. =======
  2664. ======================================================================
  2665. Parameters:
  2666.   * eax = 55 - function number
  2667.   * ebx = 1 - subfunction number
  2668. Returned value:
  2669.   * function does not return value
  2670. Remarks:
  2671.   * Previously data must be loaded by subfunction 0 and
  2672.     their format must be defined by subfunction 2.
  2673.   * Function returns control, when playing of data began; after that
  2674.     play goes independently from application (and does not use
  2675.     processor time at all).
  2676.   * Previously must be defined SB16 base port
  2677.     (by subfunction 4 of function 21) and DMA channel
  2678.     (by subfunction 10 of function 21).
  2679.  
  2680. ======================================================================
  2681. ======== Function 55, subfunction 2 - set format of SB16 data. =======
  2682. ======================================================================
  2683. Parameters:
  2684.   * eax = 55 - function number
  2685.   * ebx = 2 - subfunction number
  2686.   * ecx = 0 - set digit capacity
  2687.     * edx = 1 - 8bit mono
  2688.     * edx = 2 - 8bit stereo
  2689.   * ecx = 1 - set data size
  2690.     * edx = size in bytes
  2691.   * ecx = 2 - set play frequency
  2692.     * edx = frequency
  2693. Returned value:
  2694.   * function does not return value
  2695. Remarks:
  2696.   * When the system boots, it sets following default parameters:
  2697.     digit capacity - 8bit mono, size - 64 Kb, frequency - 44100 Hz.
  2698.     Nevertheless it is recommended to set necessary values obviously
  2699.     as they could be reset by some application.
  2700.  
  2701. ======================================================================
  2702.  Function 55, subfunction 55 - begin to play data on built-in speaker.
  2703. ======================================================================
  2704. Parameters:
  2705.   * eax = 55 - function number
  2706.   * ebx = 55 - subfunction number
  2707.   * esi = pointer to data
  2708. Returned value:
  2709.   * eax = 0 - success
  2710.   * eax = 55 - error (speaker is off or busy)
  2711. Data is an array of items with variable length.
  2712. Format of each item is defined by first byte:
  2713.   * 0 = end of data
  2714.   * 1..0x80 = sets sound duration on 1/100 of second; sound note
  2715.     is defined by immediate value of frequency
  2716.     * following word (2 bytes) contains frequency divider;
  2717.       frequency is defined as 1193180/divider
  2718.   * 0x81 = invalid
  2719.   * 0x82..0xFF = note is defined by octave and number:
  2720.     * duration in 1/100 of second = (first byte)-0x81
  2721.     * there is one more byte;
  2722.     * (second byte)=0xFF - delay
  2723.     * otherwise it looks like a*0x10+b, where b=number of the note in
  2724.       an octave from 1 to 12, a=number of octave (beginning from 0)
  2725. Remarks:
  2726.   * Speaker play can be disabled/enabled by
  2727.     subfunction 8 of function 18.
  2728.   * Function returns control, having informed the system
  2729.     an information on request. Play itself goes independently from
  2730.     the program.
  2731.   * The data must be kept in the memory at least up to the end
  2732.     of play.
  2733.  
  2734. ======================================================================
  2735. =============== Function 56 - write file to hard disk. ===============
  2736. ======================================================================
  2737. Parameters:
  2738.   * eax = 56 - function number
  2739.   * ebx = pointer to the file name
  2740.   * ecx = size of data to write (in bytes)
  2741.   * edx = pointer to data to write
  2742.   * esi = pointer to path (ASCIIZ-string)
  2743. Returned value:
  2744.   * eax = 0 - success, otherwise file system error code
  2745. Remarks:
  2746.   * This function is obsolete; function 70 allows to fulfil the same
  2747.     operations with the extended possibilities.
  2748.   * This function assumes that during its call by one application
  2749.     no other application works with hard disk.
  2750.   * The path to file is ASCIIZ-string, which may be empty
  2751.     (if the file is created in the root folder) or have the format
  2752.     /d1/d2/.../dn, where all folder names must have the 8+3 format,
  2753.     i.e. 8 characters of name and 3 characters of the extension
  2754.     without separator, supplemented by blanks if necessary;
  2755.     all letters must be capital.
  2756.   * The file name must also have the format 8+3.
  2757.  
  2758. ======================================================================
  2759. ================ Function 58 - work with file system. ================
  2760. ======================================================================
  2761. Parameters:
  2762.   * eax = 58
  2763.   * ebx = pointer to the information structure
  2764. Returned value:
  2765.   * eax = 0 - success; otherwise file system error code
  2766.   * some subfunctions return value in other registers too
  2767. General format of the information structure:
  2768.   * +0: dword: subfunction number
  2769.   * +4: dword: number of block
  2770.   * +8: dword: size
  2771.   * +12 = +0xC: dword: pointer to data
  2772.   * +16 = +0x10: dword: pointer to a memory for system operations
  2773.     (4096 bytes)
  2774.   * +20 = +0x14: n db: ASCIIZ-string with the file name
  2775. Specifications - in documentation on the appropriate subfunction.
  2776. Filename is case-insensitive for latin letters, russian letters
  2777. must be capital.
  2778. Format of filename:
  2779. /base/number/dir1/dir2/.../dirn/file,
  2780. where /base/number identifies device, on which file is located:
  2781. one of
  2782.   * /RD/1 = /RAMDISK/1 to access ramdisk
  2783.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  2784.     /FD/2 = /FLOPPYDISK/2 to access second one
  2785.   * /HD/x = /HARDDISK/x - obsolete variant of access to hard disk
  2786.     (in this case base is defined by subfunction 7 of function 21),
  2787.     x - partition number (beginning from 1)
  2788.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  2789.     IDE0 (Primary Master), IDE1 (Primary Slave),
  2790.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  2791.     x - partition number on the selected hard drive, varies from 1
  2792.     to 255 (on each hard drive the indexing starts from 1)
  2793. Remarks:
  2794.   * In the first two cases it is also possible to use FIRST
  2795.     instead of 1, SECOND instead of 2, but it is not recommended
  2796.     for convenience of transition to the future extensions.
  2797.   * Limitation n<=39 is imposed.
  2798.   * Names of folders and file dir1,...,dirn,file must have the
  2799.     format 8.3: name no more than 8 characters, dot, extension no
  2800.     more than 3 characters. Trailing spaces are ignored, no other
  2801.     spaces is allowed. If name occupies equally 8 characters,
  2802.     dot may be omitted (though it is not recommended to use this
  2803.     feature for convenience of transition to the future extensions).
  2804.   * This function does not support folders on ramdisk.
  2805. Examples:
  2806.   * '/RAMDISK/FIRST/KERNEL.ASM',0
  2807.     '/rd/1/kernel.asm',0
  2808.   * '/HD0/1/kernel.asm',0
  2809.   * '/hd0/1/menuet/pics/tanzania.bmp',0
  2810. Existing subfunctions:
  2811.   * subfunction 0 - read file/folder
  2812.   * subfunction 1 - rewrite file
  2813.   * subfunction 2 - delete file/folder
  2814.   * subfunction 3 - write to existing file
  2815.   * subfunction 4 - make folder
  2816.   * subfunction 5 - rename/move file/folder
  2817.   * subfunction 8 - LBA-read from device
  2818.   * subfunction 15 - get file system information
  2819.   * subfunction 16 - start application
  2820.  
  2821. ======================================================================
  2822. =========== Function 58, subfunction 0 - read file/folder. ===========
  2823. ======================================================================
  2824. Parameters:
  2825.   * eax = 58
  2826.   * ebx = pointer to the information structure
  2827. Format of the information structure:
  2828.   * +0: dword: 0 = subfunction number
  2829.   * +4: dword: first block to read (beginning from 0)
  2830.   * +8: dword: amount of blocks to read
  2831.   * +12 = +0xC: dword: pointer to buffer for data
  2832.   * +16 = +0x10: dword: pointer to buffer for system operations
  2833.     (4096 bytes)
  2834.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2835.     given in the general description
  2836. Returned value:
  2837.   * eax = 0 - success, otherwise file system error code
  2838.   * ebx = file size (in bytes) or -1=0xffffffff, if file was not found
  2839. Remarks:
  2840.   * Block size is 512 bytes.
  2841.   * This function is obsolete, for reading files use subfunction 0
  2842.     of function 70, for reading folders - subfunction 1 of
  2843.     function 70.
  2844.   * Function can read contents of a folder. Only FAT file system is
  2845.     supported. The format of FAT-folder is described
  2846.     in any FAT documentation.
  2847.   * Size of a folder is determined by size of FAT clusters chain.
  2848.   * If file was ended before last requested block was read,
  2849.     the function will read as many as it can, and after that return
  2850.     eax=6 (EOF).
  2851.   * Function can read root folders /rd/1,/fd/x,/hd[n]/x, but
  2852.     in the first two cases the current implementation does not follow
  2853.     to the declared rules:
  2854.     for /rd/1:
  2855.     * if one want to read 0 blocks, function considers,
  2856.       that he requested 1;
  2857.     * if one requests more than 14 blocks or starting block is
  2858.       not less than 14, function returns eax=5 (not found) è ebx=-1;
  2859.     * size of ramdisk root folder is 14 blocks,
  2860.       0x1C00=7168 áàéò; but function returns ebx=0
  2861.       (except of the case of previous item);
  2862.     * strangely enough, it is possible to read 14th block (which
  2863.       generally contains a garbage - I remind, the indexing begins
  2864.       from 0);
  2865.     * if some block with the number not less than 14 was requested,
  2866.       function returns eax=6(EOF); otherwise eax=0.
  2867.     For /fd/x:
  2868.     * if the start block is not less than 14, function returns
  2869.       eax=5 (not found) and ebx=0;
  2870.     * note that format of FAT12 allows floppies with the root size
  2871.       more or less than 14 blocks;
  2872.     * check for length is not performed;
  2873.     * if data was successful read, function returns
  2874.       eax=0,ebx=0; otherwise eax=10 (access denied), ebx=-1.
  2875.   * The function handles reading of special folders /,/rd,/fd,/hd[n];
  2876.     but the result does not correspond to expected (on operations with
  2877.     normal files/folders), does not follow the declared rules,
  2878.     may be changed in future versions of the kernel and consequently
  2879.     is not described. To obtain the information about the equipment
  2880.     use subfunction 11 of function 18 or
  2881.     read corresponding folder with subfunction 1 of function 70.
  2882.  
  2883. ======================================================================
  2884. ============= Function 58, subfunction 1 - rewrite file. =============
  2885. ======================================================================
  2886. If the file does not exist, it is created.
  2887. If the file exists, it is rewritten.
  2888. Parameters:
  2889.   * eax = 58 - function number
  2890.   * ebx = pointer to the information structure
  2891. Format of the information structure:
  2892.   * +0: dword: 1 = subfunction number
  2893.   * +4: dword: ignored (set to 0)
  2894.   * +8: dword: number of bytes to write
  2895.   * +12 = +0xC: dword: pointer to data to write
  2896.   * +16 = +0x10: dword: pointer to buffer for system operations
  2897.     (4096 bytes)
  2898.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2899.     given in the general description
  2900. Returned value:
  2901.   * eax = 0 - success, otherwise file system error code
  2902.   * ebx destroyed
  2903. Remarks:
  2904.   * This function is obsolete, use subfunction 2 of function 70.
  2905.  
  2906. ======================================================================
  2907. ========== Function 58, subfunction 2 - delete file/folder. ==========
  2908. ======================================================================
  2909. Parameters:
  2910.   * eax = 58 - function number
  2911.   * ebx = pointer to the information structure
  2912. Format of the information structure:
  2913.   * +0: dword: 2 = subfunction number
  2914.   * +4: dword: ignored
  2915.   * +8: dword: ignored
  2916.   * +12 = +0xC: dword: ignored
  2917.   * +16 = +0x10: dword: pointer to buffer for system operations
  2918.     (4096 bytes)
  2919.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2920.     given in the general description
  2921. Returned value:
  2922.   * eax = 0 - success, otherwise file system error code
  2923.   * ebx destroyed
  2924. Remarks:
  2925.   * By operations with a floppy one should not delete not empty
  2926.     folder. The code working with hard disk deletes not empty folders
  2927.     correctly (i.e. recursively with all files and nested folders).
  2928.     Function 58 does not support folders on ramdisk.
  2929.  
  2930. ======================================================================
  2931. ==== Function 58, subfunction 3 - write data to the existing file. ===
  2932. ======================================================================
  2933. Parameters:
  2934.   * eax = 58 - function number
  2935.   * ebx = pointer to the information structure
  2936. Format of the information structure:
  2937.   * +0: dword: 3 = subfunction number
  2938.   * +4: dword: starting position in the file; -1 = append to the end
  2939.   * +8: dword: number of bytes to write
  2940.   * +12 = +0xC: dword: pointer to data to write
  2941.   * +16 = +0x10: dword: pointer to buffer for system operations
  2942.     (4096 bytes)
  2943.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2944.     given in the general description
  2945. Returned value:
  2946.   * eax = 0 - success, otherwise file system error code
  2947.   * ebx destroyed
  2948. Remarks:
  2949.   * Ramdisk and floppies do not support this function, it is only
  2950.     for hard disks.
  2951.   * File must already exist (otherwise function returns 5, not found).
  2952.     To create files use subfunction 1.
  2953.   * If the starting position is greater than file size, the function
  2954.     returns eax=6(EOF). If the end position is greater than file size,
  2955.     file is extended.
  2956.   * The code of write processing for hard disk interpretes zero
  2957.     value of the field +8 as the instruction to truncate the file to
  2958.     the size, given in the field +4. However the code of processing
  2959.     58th function blocks this possibility for applications by
  2960.     immediate return (with eax=0) in the case of zero size.
  2961.  
  2962. ======================================================================
  2963. ============== Function 58, subfunction 4 - make folder. =============
  2964. ======================================================================
  2965. Parameters:
  2966.   * eax = 58 - function number
  2967.   * ebx = pointer to the information structure
  2968. Format of the information structure:
  2969.   * +0: dword: 4 = subfunction number
  2970.   * +4: dword: ignored
  2971.   * +8: dword: ignored
  2972.   * +12 = +0xC: dword: ignored
  2973.   * +16 = +0x10: dword: pointer to buffer for system operations
  2974.     (4096 bytes)
  2975.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2976.     given in the general description
  2977. Returned value:
  2978.   * eax = 0 - success, otherwise file system error code
  2979.   * ebx destroyed
  2980. Remarks:
  2981.   * Ramdisk and floppies do not support this function, it is only
  2982.     for hard disks.
  2983.  
  2984. ======================================================================
  2985. ======== Function 58, subfunction 5 - rename/move file/folder. =======
  2986. ======================================================================
  2987. Parameters:
  2988.   * eax = 58 - function number
  2989.   * ebx = pointer to the information structure
  2990. Format of the information structure:
  2991.   * +0: dword: 5 = subfunction number
  2992.   * +4: dword: ignored
  2993.   * +8: dword: ignored
  2994.   * +12 = +0xC: dword: ignored
  2995.   * +16 = +0x10: dword: pointer to buffer for system operations
  2996.     (4096 bytes)
  2997.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  2998.     given in the general description
  2999.   * +20+n: (at once after terminating null character) new
  3000.     ASCIIZ-name, must start from /hd/1, that is interpreted as
  3001.     the hard disk, indicated in the first name
  3002.     (moving from one disk to another is not supported)
  3003. Returned value:
  3004.   * eax = 0 - success, otherwise file system error code
  3005.   * ebx destroyed
  3006. Remarks:
  3007.   * Ramdisk and floppies do not support this function, it is only
  3008.     for hard disks.
  3009.   * If the new ASCIIZ-name is strongly incorrect, i.e. does not start
  3010.     from /hd/1, /hd/first, /harddisk/1, /harddisk/first or after this
  3011.     space or null character follows, function returns, strangely
  3012.     enough, error code 4. It is the only function which returns
  3013.     this code.
  3014.  
  3015. ======================================================================
  3016. ========= Function 58, subfunction 8 - LBA-read from device. =========
  3017. ======================================================================
  3018. Parameters:
  3019.   * eax = 58 - function number
  3020.   * ebx = pointer to the information structure
  3021. Format of the information structure:
  3022.   * +0: dword: 8 = subfunction number
  3023.   * +4: dword: number of block to read (beginning from 0)
  3024.   * +8: dword: ignored (set to 1)
  3025.   * +12 = +0xC: dword: pointer to buffer for data (512 bytes)
  3026.   * +16 = +0x10: dword: pointer to buffer for system operations
  3027.     (4096 bytes)
  3028.   * +20 = +0x14: ASCIIZ-name of device: case-insensitive, one of
  3029.     /rd/1 = /RamDisk/1, /hd/n = /HardDisk/n,
  3030.     1<=n<=4 - number of device: 1=IDE0, ..., 4=IDE3.
  3031.     Instead of digits it is allowed, though not recommended for
  3032.     convenience of transition to future extensions, to use
  3033.     'first','second','third','fourth'.
  3034. Returned value:
  3035.   * for device name /hd/xxx, where xxx is not in the list above:
  3036.     * eax = ebx = 1
  3037.   * for invalid device name (except for the previous case):
  3038.     * eax = 5
  3039.     * ebx does not change
  3040.   * if LBA-access is disabled by subfunction 11 of function 21:
  3041.     * eax = 2
  3042.     * ebx destroyed
  3043.   * for ramdisk: attempt to read block outside ramdisk
  3044.     (18*2*80 blocks) results in
  3045.     * eax = 3
  3046.     * ebx = 0
  3047.   * for successful read:
  3048.     * eax = ebx = 0
  3049. Remarks:
  3050.   * Block size is 512 bytes; function reads one block.
  3051.   * Do not depend on returned value, it can be changed
  3052.     in future versions.
  3053.   * Function requires that LBA-access to devices is enabled by
  3054.     subfunction 11 of function 21. To check this one can use
  3055.     subfunction 11 of function 26.
  3056.   * LBA-read of floppy is not supported.
  3057.   * Function reads data on physical hard drive; if for any reason
  3058.     data of the concrete partition are required, application must
  3059.     define starting sector of this partition (either directly
  3060.     through MBR, or from the full structure returned by
  3061.     ïîäôóíêöèåé 11 ôóíêöèè 18).
  3062.   * Function does not check error code of hard disk, so request of
  3063.     nonexisting sector reads something (most probably it will be
  3064.     zeroes, but this is defined by device) and this is considered
  3065.     as success (eax=0).
  3066.  
  3067. ======================================================================
  3068. ==== Function 58, subfunction 15 - get information on file system. ===
  3069. ======================================================================
  3070. Parameters:
  3071.   * eax = 58 - function number
  3072.   * ebx = pointer to the information structure
  3073. Format of the information structure:
  3074.   * +0: dword: 15 = subfunction number
  3075.   * +4: dword: ignored
  3076.   * +8: dword: ignored
  3077.   * +12 = +0xC: dword: ignored
  3078.   * +16 = +0x10: dword: ignored
  3079.   * +20 = +0x14: (only second character is checked)
  3080.     /rd=/RAMDISK or /hd=/HARDDISK
  3081. Returned value:
  3082.   * if the second character does not belong to set {'r','R','h','H'}:
  3083.     * eax = 3
  3084.     * ebx = ecx = dword [fileinfo] = 0
  3085.   * for ramdisk:
  3086.     * eax = 0 (success)
  3087.     * ebx = total number of clusters = 2847
  3088.     * ecx = number of free clusters
  3089.     * dword [fileinfo] = cluster size = 512
  3090.   * for hard disk: base and partition are defined by subfunctions
  3091.     7 and 8 of function 21:
  3092.     * eax = 0 (success)
  3093.     * ebx = total number of clusters
  3094.     * ecx = number of free clusters
  3095.     * dword [fileinfo] = cluster size (in bytes)
  3096. Remarks:
  3097.   * Be not surprised to strange layout of 4th returned parameter
  3098.     - when this code was writing, at system calls application got
  3099.     only registers eax,ebx,ecx (from pushad-structure transmitted
  3100.     as argument to the system function). Now it is corrected, so,
  3101.     probably, it is meaningful to return cluster size in edx, while
  3102.     this function is not used yet.
  3103.   * There exists also subfunction 11 of function 18,
  3104.     which returns information on file system. From the full table
  3105.     of disk subsystem it is possible to deduce cluster size (there
  3106.     it is stored in sectors) and total number of clusters
  3107.     for hard disks.
  3108.  
  3109. ======================================================================
  3110. ========== Function 58, subfunction 16 - start application. ==========
  3111. ======================================================================
  3112. Parameters:
  3113.   * eax = 58 - function number
  3114.   * ebx = pointer to the information structure
  3115. Format of the information structure:
  3116.   * +0: dword: 16 = subfunction number
  3117.   * +4: dword: flags:
  3118.     * bit 0: start the process as debugged
  3119.     * other bits are reserved and must be cleared
  3120.   * +8: dword: 0 or pointer to ASCIIZ-string with parameters
  3121.   * +12 = +0xC: dword: ignored
  3122.   * +16 = +0x10: dword: pointer to buffer for system operations
  3123.     (4096 bytes)
  3124.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  3125.     given in the general description
  3126. Returned value:
  3127.   * eax > 0 - the program is loaded, eax contains PID
  3128.   * eax < 0 - an error has occured, -eax contains
  3129.     file system error code
  3130. Remarks:
  3131.   * This function is obsolete, use subfunction 7 of function 70.
  3132.   * Command line must be terminated by character with code 0
  3133.     (ASCIIZ-string); function takes into account either all characters
  3134.     up to terminating null inclusively or the first 256 charachters
  3135.     depending on what is less.
  3136.   * If the process is started as debugged, it is created in
  3137.     the suspended state; to run use subfunction 5 of function 69.
  3138.  
  3139. ======================================================================
  3140. =============== Function 59 - trace last system calls. ===============
  3141. ======================================================================
  3142. Gets data on all system calls of all processes.
  3143. Parameters:
  3144.   * eax = 59 - function number
  3145.   * ebx = 0 - unique subfunction
  3146.   * ecx = pointer to the buffer
  3147.   * edx = size of the buffer
  3148. Returned value:
  3149.   * eax = total number of system calls made from system boot
  3150.     (modulo 2^32)
  3151.   * ebx = 0
  3152. Format of information on one call: (size = 0x40 = 64 bytes)
  3153.   * +0: dword: PID of process/thread
  3154.   * +4: 7*dword: garbage
  3155.   * +32 = +0x20: dword: value of edi at the call
  3156.   * +36 = +0x24: dword: esi
  3157.   * +40 = +0x28: dword: ebp
  3158.   * +44 = +0x2C: dword: stack pointer of the kernel handler
  3159.   * +48 = +0x30: dword: ebx
  3160.   * +52 = +0x34: dword: edx
  3161.   * +56 = +0x38: dword: ecx
  3162.   * +60 = +0x3C: dword: eax (=number of system function)
  3163. Remarks:
  3164.   * The function is used only in the application 'systrace'.
  3165.     It is rather difficult to imagine a situation, in which
  3166.     this application or this function are really useful;
  3167.     and all system calls for support of this function are a little
  3168.     decelerated (though not strongly)...
  3169.   * So there is a proposition to delete from the kernel
  3170.     support of this function, together with application 'systrace'.
  3171.   * The information on system calls saves in the system
  3172.     ring buffer with 0x10 entries.
  3173.     This function simply copies the given size of data
  3174.     from this buffer to the given address.
  3175.   * One can determine, which entry in the buffer corresponds to
  3176.     last system call, by value of eax, namely, it is the entry
  3177.     (eax and 0xF) (at offset (eax and 0xF)*0x40).
  3178.   * In the current implementation there can be the seldom
  3179.     meeting problems of unsynchronization, when the information
  3180.     on some calls becomes outdated.
  3181.   * Under the system buffer one page, 4Kb, is allocated.
  3182.     Size of an entry = 64 bytes. Why only 16 entries are used,
  3183.     is not clearly.
  3184.   * The value of esp at the moment of system call cannot
  3185.     be determined by this function.
  3186.   * The current implementation does not check edx for correctness.
  3187.  
  3188. ======================================================================
  3189. ========== Function 60 - Inter Process Communication (IPC). ==========
  3190. ======================================================================
  3191. IPC is used for message dispatching from one process/thread to
  3192. another. Previously it is necessary to agree how to interpret
  3193. the concrete message.
  3194.  
  3195. ----------- Subfunction 1 - set the area for IPC receiving -----------
  3196. Is called by process-receiver.
  3197. Parameters:
  3198.   * eax = 60 - function number
  3199.   * ebx = 1 - subfunction number
  3200.   * ecx = pointer to the buffer
  3201.   * edx = size of the buffer
  3202. Returned value:
  3203.   * eax = 0 - always success
  3204. Format of IPC-buffer:
  3205.   * +0: dword: if nonzero, buffer is considered locked;
  3206.     lock/unlock the buffer, when you work with it and need that
  3207.     buffer data are not changed from outside (no new messages)
  3208.   * +4: dword: occupied place in the buffer (in bytes)
  3209.   * +8: first message
  3210.   * +8+n: second message
  3211.   * ...
  3212. Format of a message:
  3213.   * +0: dword: PID of sender
  3214.   * +4: dword: message length (not including this header)
  3215.   * +8: n*byte: message data
  3216.  
  3217. ------------------ Subfunction 2 - send IPC message ------------------
  3218. Is called by process-sender.
  3219. Parameters:
  3220.   * eax = 60 - function number
  3221.   * ebx = 2 - subfunction number
  3222.   * ecx = PID of receiver
  3223.   * edx = pointer to the message data
  3224.   * esi = message length (in bytes)
  3225. Returned value:
  3226.   * eax = 0 - success
  3227.   * eax = 1 - the receiver has not defined buffer for IPC messages
  3228.     (can be, still have no time,
  3229.     and can be, this is not right process)
  3230.   * eax = 2 - the receiver has blocked IPC-buffer; try to wait a bit
  3231.   * eax = 3 - overflow of IPC-buffer of the receiver
  3232.   * eax = 4 - process/thread with such PID does not exist
  3233. Remarks:
  3234.   * Immediately after writing of IPC-message to the buffer the system
  3235.     sends to the receiver the event with code 7 (see event codes).
  3236.  
  3237. ======================================================================
  3238. ==== Function 61 - get parameters for the direct graphics access. ====
  3239. ======================================================================
  3240. The data of the graphics screen (the memory area which displays
  3241. screen contents) are accessible to a program directly, without
  3242. any system calls, through the selector gs:
  3243.         mov     eax, [gs:0]
  3244. places in eax the first dword of the buffer, which contains
  3245. information on color of the left upper point (and, possibly, colors
  3246. of several following).
  3247.         mov     [gs:0], eax
  3248. by work in VESA modes with LFB sets color of the left upper point
  3249. (and, possibly, colors of several following).
  3250. To interpret the data of graphics screen program needs to know
  3251. some parameters, returning by this function.
  3252. Remarks:
  3253.   * Graphics parameters changes very seldom at work,
  3254.     namely, only in cases, when user works with the application VRR.
  3255.   * At videomode change the system redraws all windows (event
  3256.     with code 1) and redraws the background (event 5).
  3257.     Same events occur in other cases too, which meet much more often,
  3258.     than videomode change.
  3259.   * By operation in videomodes with LFB the selector gs points to
  3260.     LFB itself, so reading/writing on gs result directly in
  3261.     change of screen contents. By operation in videomodes without
  3262.     LFB gs points to some data area in the kernel, and all functions
  3263.     of screen output fulfil honesty double operation on writing
  3264.     directly to the screen and writing to this buffer. In result
  3265.     at reading contents of this buffer the results correspond to
  3266.     screen contents (with, generally speaking, large color
  3267.     resolution), and writing is ignored.
  3268.     One exception is the mode 320*200, for which main loop of the
  3269.     system thread updates the screen according to mouse movements.
  3270.  
  3271. ------------------------- Screen resolution --------------------------
  3272. Parameters:
  3273.   * eax = 61 - function number
  3274.   * ebx = 1 - subfunction number
  3275. Returned value:
  3276.   * eax = [resolution on x axis]*65536 + [resolution on y axis]
  3277. Remarks:
  3278.   * One can use function 14 paying attention that
  3279.     it returns sizes on 1 pixel less. It is fully equivalent way.
  3280.  
  3281. ---------------------- Number of bits per pixel ----------------------
  3282. Parameters:
  3283.   * eax = 61 - function number
  3284.   * ebx = 2 - subfunction number
  3285. Returned value:
  3286.   * eax = number of bits per pixel (24 or 32)
  3287.  
  3288. -------------------- Number of bytes per scanline --------------------
  3289. Parameters:
  3290.   * eax = 61 - function number
  3291.   * ebx = 3 - subfunction number
  3292. Returned value:
  3293.   * eax = number of bytes occupied by one scanline
  3294.     (horizontal line on the screen)
  3295.  
  3296. ======================================================================
  3297. ===== Function 62, subfunction 0 - get version of PCI-interface. =====
  3298. ======================================================================
  3299. Parameters:
  3300.   * eax = 62 - function number
  3301.   * bl = 0 - subfunction number
  3302. Returned value:
  3303.   * eax = -1 - PCI access is disabled; otherwise
  3304.   * ah.al = version of PCI-interface (ah=version, al=subversion)
  3305.   * high word of eax is zeroed
  3306. Remarks:
  3307.   * Previously low-level access to PCI for applications must be
  3308.     enabled by subfunction 12 of function 21.
  3309.   * If PCI BIOS is not supported, the value of ax is undefined.
  3310.  
  3311. ======================================================================
  3312. ==== Function 62, subfunction 1 - get number of the last PCI-bus. ====
  3313. ======================================================================
  3314. Parameters:
  3315.   * eax = 62 - function number
  3316.   * bl = 1 - subfunction number
  3317. Returned value:
  3318.   * eax = -1 - access to PCI is disabled; otherwise
  3319.   * al = number of the last PCI-bus; other bytes of eax are destroyed
  3320. Remarks:
  3321.   * Previously low-level access to PCI for applications must be
  3322.     enabled by subfunction 12 of function 21.
  3323.   * If PCI BIOS is not supported, the value of ax is undefined.
  3324.  
  3325. ======================================================================
  3326. ===================== Function 62, subfunction 2 =====================
  3327. ===== Get mechanism of addressing to the PCI configuration space. ====
  3328. ======================================================================
  3329. Parameters:
  3330.   * eax = 62 - function number
  3331.   * bl = 2 - subfunction number
  3332. Returned value:
  3333.   * eax = -1 - access to PCI is disabled; otherwise
  3334.   * al = mechanism (1 or 2); other bytes of eax are destroyed
  3335. Remarks:
  3336.   * Previously low-level access to PCI for applications must be
  3337.     enabled by subfunction 12 of function 21.
  3338.   * Addressing mechanism is selected depending on
  3339.     equipment characteristics.
  3340.   * Subfunctions of read and write work automatically
  3341.     with the selected mechanism.
  3342.  
  3343. ======================================================================
  3344. ======== Function 62, subfunctions 4,5,6 - read PCI-register. ========
  3345. ======================================================================
  3346. Parameters:
  3347.   * eax = 62 - function number
  3348.   * bl = 4 - read byte
  3349.   * bl = 5 - read word
  3350.   * bl = 6 - read dword
  3351.   * bh = number of PCI-bus
  3352.   * ch = dddddfff, where ddddd = number of the device on the bus,
  3353.     fff = function number of device
  3354.   * cl = number of register (must be even for bl=5,
  3355.     divisible by 4 for bl=6)
  3356. Returned value:
  3357.   * eax = -1 - error (access to PCI is disabled or parameters
  3358.     are not supported); otherwise
  3359.   * al/ax/eax (depending on requested size) contains the data;
  3360.     the other part of register eax is destroyed
  3361. Remarks:
  3362.   * Previously low-level access to PCI for applications must be
  3363.     enabled by subfunction 12 of function 21.
  3364.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  3365.     function number. To get access mechanism use subfunction 2.
  3366.   * Some registers are standard and exist for all devices, some are
  3367.     defined by the concrete device. The list of registers of the
  3368.     first type can be found e.g. in famous
  3369.     Interrupt List by Ralf Brown
  3370.     (http://www.pobox.com/~ralf/files.html,
  3371.     ftp://ftp.cs.cmu.edu/afs/cs/user/ralf/pub/);
  3372.     registers of the second type must be listed
  3373.     in the device documentation.
  3374.  
  3375. ======================================================================
  3376. ====== Function 62, subfunctions 8,9,10 - write to PCI-register. =====
  3377. ======================================================================
  3378. Parameters:
  3379.   * eax = 62 - function number
  3380.   * bl = 8 - write byte
  3381.   * bl = 9 - write word
  3382.   * bl = 10 - write dword
  3383.   * bh = number of PCI-bus
  3384.   * ch = dddddfff, where ddddd = number of the device on the bus,
  3385.     fff = function number of device
  3386.   * cl = number of register (must be even for bl=9,
  3387.     divisible by 4 for bl=10)
  3388.   * dl/dx/edx (depending on requested size) contatins
  3389.     the data to write
  3390. Returned value:
  3391.   * eax = -1 - error (access to PCI is disabled or parameters
  3392.     are not supported)
  3393.   * eax = 0 - success
  3394. Remarks:
  3395.   * Previously low-level access to PCI for applications must be
  3396.     enabled by subfunction 12 of function 21.
  3397.   * Access mechanism 2 supports only 16 devices on a bus and ignores
  3398.     function number. To get access mechanism use subfunction 2.
  3399.   * Some registers are standard and exist for all devices, some are
  3400.     defined by the concrete device. The list of registers of the
  3401.     first type can be found e.g. in famous Interrupt List by
  3402.     Ralf Brown; registers of the second type must be listed
  3403.     in the device documentation.
  3404.  
  3405. ======================================================================
  3406. ============== Function 63 - work with the debug board. ==============
  3407. ======================================================================
  3408. The debug board is the global system buffer (with the size
  3409. 512 bytes), to which any program can write (generally speaking,
  3410. arbitrary) data and from which other program can read these data.
  3411. By the agreement written data are text strings interpreted as
  3412. debug messages on a course of program execution. The kernel in
  3413. some situations also writes to the debug board information on
  3414. execution of some functions; by the agreement kernel messages
  3415. begins from the prefix "K : ".
  3416. For view of the debug board the application 'board' was created,
  3417. which reads data from the buffer and displays them in its window.
  3418. 'board' interpretes the sequence of codes 13,10 as newline.
  3419. A character with null code in an end of line is not necessary,
  3420. but also does not prevent.
  3421. Because debugger has been written, the value of the debug board
  3422. has decreased, as debugger allows to inspect completely a course of
  3423. program execution without any efforts from the direction of program
  3424. itself. Nevertheless in some cases the debug board is still useful.
  3425.  
  3426. ----------------------------- Write byte -----------------------------
  3427. Parameters:
  3428.   * eax = 63 - function number
  3429.   * ebx = 1 - subfunction number
  3430.   * cl = data byte
  3431. Returned value:
  3432.   * function does not return value
  3433. Remarks:
  3434.   * Byte is written to the buffer. Buffer size is 512 bytes.
  3435.     At buffer overflow all obtained data are lost.
  3436.   * For output to the debug board of more complicated objects
  3437.     (strings, numbers) it is enough to call this function in cycle.
  3438.     It is possible not to write the appropriate code manually and use
  3439.     file 'debug.inc', which is included into the distributive.
  3440.  
  3441. ----------------------------- Read byte ------------------------------
  3442. Takes away byte from the buffer.
  3443. Parameters:
  3444.   * eax = 63 - function number
  3445.   * ebx = 2 - subfunction number
  3446. Returned value:
  3447.   * eax = ebx = 0 - the buffer is empty
  3448.   * eax = byte, ebx = 1 - byte was successfully read
  3449.  
  3450. ======================================================================
  3451. ============== Function 64 - resize application memory. ==============
  3452. ======================================================================
  3453. Parameters:
  3454.   * eax = 64 - function number
  3455.   * ebx = 1 - unique subfunction
  3456.   * ecx = new memory size
  3457. Returned value:
  3458.   * eax = 0 - success
  3459.   * eax = 1 - not enough memory
  3460. Remarks:
  3461.   * At the moment this function is a sole resource for dynamic
  3462.     allocation/free of application memory.
  3463.  
  3464. ======================================================================
  3465. ================== Function 66 - work with keyboard. =================
  3466. ======================================================================
  3467. The input mode influences results of reading keys by function 2.
  3468. When a program loads, ASCII input mode is set for it.
  3469.  
  3470. -------------- Subfunction 1 - set keyboard input mode. --------------
  3471. Parameters:
  3472.   * eax = 66 - function number
  3473.   * ebx = 1 - subfunction number
  3474.   * ecx = mode:
  3475.     * 0 = normal (ASCII-characters)
  3476.     * 1 = scancodes
  3477. Returned value:
  3478.   * function does not return value
  3479.  
  3480. -------------- Subfunction 2 - get keyboard input mode. --------------
  3481. Parameters:
  3482.   * eax = 66 - function number
  3483.   * ebx = 2 - subfunction number
  3484. Returned value:
  3485.   * eax = current mode
  3486.  
  3487. ------------ Subfunction 3 - get status of control keys. -------------
  3488. Parameters:
  3489.   * eax = 66 - function number
  3490.   * ebx = 3 - subfunction number
  3491. Returned value:
  3492.   * eax = bit mask:
  3493.   * bit 0 (mask 1): left Shift is pressed
  3494.   * bit 1 (mask 2): right Shift is pressed
  3495.   * bit 2 (mask 4): left Ctrl is pressed
  3496.   * bit 3 (mask 8): right Ctrl is pressed
  3497.   * bit 4 (mask 0x10): left Alt is pressed
  3498.   * bit 5 (mask 0x20): right Alt is pressed
  3499.   * bit 6 (mask 0x40): CapsLock is on
  3500.   * bit 7 (mask 0x80): NumLock is on
  3501.   * bit 8 (mask 0x100): ScrollLock is on
  3502.   * other bits are cleared
  3503.  
  3504. -------------- Subfunction 4 - set system-wide hotkey. ---------------
  3505. When hotkey is pressed, the system notifies only those applications,
  3506. which have installed it; the active application (which receives
  3507. all normal input) does not receive such keys.
  3508. The notification consists in sending event with the code 2.
  3509. Reading hotkey is the same as reading normal key - by function 2.
  3510. Parameters:
  3511.   * eax = 66 - function number
  3512.   * ebx = 4 - subfunction number
  3513.   * cl determines key scancode;
  3514.     use cl=0 to give combinations such as Ctrl+Shift
  3515.   * edx = 0xXYZ determines possible states of control keys:
  3516.     * Z (low 4 bits) determines state of LShift and RShift:
  3517.       * 0 = no key must be pressed;
  3518.       * 1 = exactly one key must be pressed;
  3519.       * 2 = both keys must be pressed;
  3520.       * 3 = must be pressed LShift, but not RShift;
  3521.       * 4 = must be pressed RShift, but not LShift
  3522.     * Y - similar for LCtrl and RCtrl;
  3523.     * X - similar for LAlt and RAlt
  3524. Returned value:
  3525.   * eax=0 - success
  3526.   * eax=1 - too mant hotkeys (maximum 256 are allowed)
  3527. Remarks:
  3528.   * Hotkey can work either at pressing or at release. Release
  3529.     scancode of a key is more on 128 than pressing scancode
  3530.     (i.e. high bit is set).
  3531.   * Several applications can set the same combination;
  3532.     all such applications will be informed on pressing
  3533.     such combination.
  3534.  
  3535. -------------- Subfunction 5 - delete installed hotkey. --------------
  3536. Parameters:
  3537.   * eax = 66 - function number
  3538.   * ebx = 5 - subfunction number
  3539.   * cl = scancode of key and edx = 0xXYZ the same as in subfunction 4
  3540. Returned value:
  3541.   * eax = 0 - success
  3542.   * eax = 1 - there is no such hotkey
  3543. Remarks:
  3544.   * When a process/thread terminates, all hotkey installed by it are
  3545.     deleted.
  3546.   * The call to this subfunction does not affect other applications.
  3547.     If other application has defined the same combination, it will
  3548.     still receive notices.
  3549.  
  3550. ======================================================================
  3551. ========= Function 67 - change position/sizes of the window. =========
  3552. ======================================================================
  3553. Parameters:
  3554.   * eax = 67 - function number
  3555.   * ebx = new x-coordinate of the window
  3556.   * ecx = new y-coordinate of the window
  3557.   * edx = new x-size of the window
  3558.   * esi = new y-size of the window
  3559. Returned value:
  3560.   * function does not return value
  3561. Remarks:
  3562.   * The value -1 for a parameter means "do not change"; e.g. to move
  3563.     the window without resizing it is possible to specify edx=esi=-1.
  3564.   * Previously the window must be defined by function 0.
  3565.     It sets initial coordinates and sizes of the window.
  3566.   * Sizes of the window are understood in sense of function 0,
  3567.     that is one pixel less than real sizes.
  3568.   * The function call for maximized windows is simply ignored.
  3569.   * For windows of appropriate styles position and/or sizes can be
  3570.     changed by user; current position and sizes can be obtained by
  3571.     call to function 9.
  3572.   * The function sends to the window redraw event (with the code 1).
  3573.  
  3574. ======================================================================
  3575. ====== Function 68, subfunction 0 - get the task switch counter. =====
  3576. ======================================================================
  3577. Parameters:
  3578.   * eax = 68 - function number
  3579.   * ebx = 0 - subfunction number
  3580. Returned value:
  3581.   * eax = number of task switches from the system booting
  3582.     (modulo 2^32)
  3583.  
  3584. ======================================================================
  3585. ======= Function 68, subfunction 1 - switch to the next thread. ======
  3586. ======================================================================
  3587. The function completes the current time slice allocated to the
  3588. thread and switches to the next. (Which thread in which process
  3589. will be next, is unpredictable). Later, when execution queue
  3590. will reach the current thread, execution will be continued.
  3591. Parameters:
  3592.   * eax = 68 - function number
  3593.   * ebx = 1 - subfunction number
  3594. Returned value:
  3595.   * function does not return value
  3596.  
  3597. ======================================================================
  3598. ============= Function 68, subfunction 2 - cache + rdpmc. ============
  3599. ======================================================================
  3600. Parameters:
  3601.   * eax = 68 - function number
  3602.   * ebx = 2 - subfunction number
  3603.   * ecx = required action:
  3604.     * ecx = 0 - enable instruction 'rdpmc'
  3605.       (ReaD Performance-Monitoring Counters) for applications
  3606.     * ecx = 1 - find out whether cache is disabled/enabled
  3607.     * ecx = 2 - enable cache
  3608.     * ecx = 3 - disable cache
  3609. Returned value:
  3610.   * for ecx=0:
  3611.     * eax = the value of cr4
  3612.   * for ecx=1:
  3613.     * eax = (cr0 and 0x60000000):
  3614.     * eax = 0 - cache is on
  3615.     * eax <> 0 - cache is off
  3616.   * for ecx=2 and ecx=3:
  3617.     * function does not return value
  3618.  
  3619. ======================================================================
  3620. =========== Function 68, subfunction 3 - read MSR-register. ==========
  3621. ======================================================================
  3622. MSR = Model Specific Register; the complete list of MSR-registers
  3623. of a processor is included to the documentation on it (for example,
  3624. IA-32 Intel Architecture Software Developer's Manual,
  3625. Volume 3, Appendix B); each processor family has its own subset
  3626. of the MSR-registers.
  3627. Parameters:
  3628.   * eax = 68 - function number
  3629.   * ebx = 3 - subfunction number
  3630.   * ecx is ignored
  3631.   * edx = MSR address
  3632. Returned value:
  3633.   * ebx:eax = high:low dword of the result
  3634. Remarks:
  3635.   * If ecx contains nonexistent or not implemented for this processor
  3636.     MSR, processor will generate an exception in the kernel, which
  3637.     will kill the thread.
  3638.   * Previously it is necessary to check, whether MSRs are supported
  3639.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3640.     will generate other exception in the kernel, which will anyway
  3641.     kill the thread.
  3642.  
  3643. ======================================================================
  3644. ========= Function 68, subfunction 4 - write to MSR-register. ========
  3645. ======================================================================
  3646. MSR = Model Specific Register; the complete list of MSR-registers
  3647. of a processor is included to the documentation on it (for example,
  3648. IA-32 Intel Architecture Software Developer's Manual,
  3649. Volume 3, Appendix B); each processor family has its own subset
  3650. of the MSR-registers.
  3651. Parameters:
  3652.   * eax = 68 - function number
  3653.   * ebx = 4 - subfunction number
  3654.   * ecx is ignored
  3655.   * edx = MSR address
  3656.   * esi:edi = high:low dword
  3657. Returned value:
  3658.   * ebx:eax = copy of esi:edi
  3659. Çàìå÷àíèÿ:
  3660.   * If ecx contains nonexistent or not implemented for this processor
  3661.     MSR, processor will generate an exception in the kernel, which
  3662.     will kill the thread.
  3663.   * Previously it is necessary to check, whether MSRs are supported
  3664.     as a whole, with the instruction 'cpuid'. Otherwise processor
  3665.     will generate other exception in the kernel, which will anyway
  3666.     kill the thread.
  3667.  
  3668. ======================================================================
  3669. ======= Function 68, subfunction 5 - allocate physical memory. =======
  3670. ======================================================================
  3671. Parameters:
  3672.   * eax = 68 - function number
  3673.   * ebx = 5 - subfunction number
  3674.   * ecx = size (in bytes)
  3675. Returned value:
  3676.   * eax = physical address of allocated memory
  3677. Remarks:
  3678.   * Normal applications must not use this function, it is intended
  3679.     for the case, when for some device it is required to place
  3680.     data to the known physical address. (In effect, this function
  3681.     was developed for AC97WAV.)
  3682.   * The number of blocks of physical memory is limited (by constant
  3683.     24, and this constant includes some blocks for kernel).
  3684.   * To free a memory allocated by such way use
  3685.     subfunction 6, to copy data there and back
  3686.     use subfunctions 7 and 8.
  3687.  
  3688. ======================================================================
  3689. ========= Function 68, subfunction 6 - free physical memory. =========
  3690. ======================================================================
  3691. Parameters:
  3692.   * eax = 68 - function number
  3693.   * ebx = 6 - subfunction number
  3694.   * ecx = physical address of memory
  3695. Returned value:
  3696.   * function does not return value
  3697. Remarks:
  3698.   * Normal applications must not use this function, it is intended
  3699.     for the case, when for some device it is required to place
  3700.     data to the known physical address. (In effect, this function
  3701.     was developed for AC97WAV.)
  3702.   * The memory must be previously allocated by subfunction 5.
  3703.  
  3704. ======================================================================
  3705. ===== Function 68, subfunction 7 - write data to physical memory. ====
  3706. ======================================================================
  3707. Parameters:
  3708.   * eax = 68 - function number
  3709.   * ebx = 7 - subfunction number
  3710.   * ecx = physical address
  3711.   * edx = pointer to the data (in the application)
  3712.   * esi = size of the data (in bytes)
  3713. Returned value:
  3714.   * function does not return value
  3715. Remarks:
  3716.   * Normal applications must not use this function, it is intended
  3717.     for the case, when for some device it is required to place
  3718.     data to the known physical address. (In effect, this function
  3719.     was developed for AC97WAV.)
  3720.   * The range of physical addresses should lie inside of previously
  3721.     allocated by subfunction 5 block of physical memory.
  3722.   * There is no check for correctness.
  3723.  
  3724. ======================================================================
  3725. ==== Function 68, subfunction 8 - read data from physical memory. ====
  3726. ======================================================================
  3727. Parameters:
  3728.   * eax = 68 - function number
  3729.   * ebx = 8 - subfunction number
  3730.   * ecx = physical address
  3731.   * edx = pointer to buffer for data (in application)
  3732.   * esi = size of data (in bytes)
  3733. Returned value:
  3734.   * function does not return value
  3735. Remarks:
  3736.   * Normal applications must not use this function, it is intended
  3737.     for the case, when for some device it is required to place
  3738.     data to the known physical address. (In effect, this function
  3739.     was developed for AC97WAV.)
  3740.   * The range of physical addresses should lie inside of previously
  3741.     allocated by subfunction 5 block of physical memory.
  3742.   * There is no check for correctness.
  3743.  
  3744. ======================================================================
  3745. ====================== Fucntion 69 - debugging. ======================
  3746. ======================================================================
  3747. A process can load other process as debugged by set of corresponding
  3748. bit by call to subfunction 16 of function 58
  3749. or subfunction 7 of function 70.
  3750. A process can have only one debugger; one process can debug some
  3751. others. The system notifies debugger on events occuring with
  3752. debugged process. Messages are written to the buffer defined by
  3753. subfunction 0.
  3754. Format of a message:
  3755.   * +0: dword: message code
  3756.   * +4: dword: PID of debugged process
  3757.   * +8: there can be additional data depending on message code
  3758. Message codes:
  3759.   * 1 = exception
  3760.     * in addition dword-number of the exception is given
  3761.     * process is suspended
  3762.   * 2 = process has terminated
  3763.     * comes at any termination: both through the system function -1,
  3764.       and at "murder" by any other process (including debugger itself)
  3765.   * 3 = debug exception int 1 = #DB
  3766.     * in addition dword-image of the register DR6 is given:
  3767.       * bits 0-3: condition of the corresponding breakpoint (set by
  3768.         subfunction 9) is satisfied
  3769.       * áèò 14: exception has occured because of the trace mode
  3770.         (flag TF is set TF)
  3771.     * process is suspended
  3772. When debugger terminates, all debugged processes are killed.
  3773. If debugger does not want this, it must previously detach by
  3774. subfunction 3.
  3775.  
  3776. All subfunctions are applicable only to processes/threads started
  3777. from the current by function 58 or 70 with set debugging flag.
  3778. Debugging of multithreaded programs is not supported yet.
  3779. The full list of subfunctions:
  3780.   * subfunction 0 - define data area for debug messages
  3781.   * subfunction 1 - get contents of registers of debugged thread
  3782.   * subfunction 2 - set contents of registers of debugged thread
  3783.   * subfunction 3 - detach from debugged process
  3784.   * subfunction 4 - suspend debugged thread
  3785.   * subfunction 5 - resume debugged thread
  3786.   * subfunction 6 - read from the memory of debugged process
  3787.   * subfunction 7 - write to the memory of debugged process
  3788.   * subfunction 8 - terminate debugged thread
  3789.   * subfunction 9 - set/clear hardware breakpoint
  3790.  
  3791. ======================================================================
  3792. = Function 69, subfunction 0 - define data area fror debug messages. =
  3793. ======================================================================
  3794. Parameters:
  3795.   * eax = 69 - function number
  3796.   * ebx = 0 - subfunction number
  3797.   * ecx = pointer
  3798. Format of data area:
  3799.   * +0: dword: N = buffer size (not including this header)
  3800.   * +4: dword: occupied place
  3801.   * +8: N*byte: buffer
  3802. Returned value:
  3803.   * function does not return value
  3804. Remarks:
  3805.   * If the size field is negative, the buffer is considered locked
  3806.     and at arrival of new message the system will wait.
  3807.     For synchronization frame all work with the buffer by operations
  3808.     lock/unlock
  3809.         neg     [bufsize]
  3810.   * Data in the buffer are considered as array of items with variable
  3811.     length - messages. Format of a message is explained in
  3812.     general description.
  3813.  
  3814. ======================================================================
  3815. ===================== Function 69, subfunction 1 =====================
  3816. ============ Get contents of registers of debugged thread. ===========
  3817. ======================================================================
  3818. Parameters:
  3819.   * eax = 69 - function number
  3820.   * ebx = 1 - subfunction number
  3821.   * ecx = thread identifier
  3822.   * edx = size of context structure, must be 0x28=40 bytes
  3823.   * esi = pointer to context structure
  3824. Returned value:
  3825.   * function does not return value
  3826. Format of context structure: (FPU is not supported yet)
  3827.   * +0: dword: eip
  3828.   * +4: dword: eflags
  3829.   * +8: dword: eax
  3830.   * +12 = +0xC: dword: ecx
  3831.   * +16 = +0x10: dword: edx
  3832.   * +20 = +0x14: dword: ebx
  3833.   * +24 = +0x18: dword: esp
  3834.   * +28 = +0x1C: dword: ebp
  3835.   * +32 = +0x20: dword: esi
  3836.   * +36 = +0x24: dword: edi
  3837. Remarks:
  3838.   * If the thread executes code of ring-0, the function returns
  3839.     contents of registers of ring-3.
  3840.   * Process must be loaded for debugging (as is shown in
  3841.     general description).
  3842.  
  3843. ======================================================================
  3844. ===================== Function 69, subfunction 2 =====================
  3845. ============ Set contents of registers of debugged thread. ===========
  3846. ======================================================================
  3847. Parameters:
  3848.   * eax = 69 - function number
  3849.   * ebx = 2 - subfunction number
  3850.   * ecx = thread identifier
  3851.   * edx = size of context structure, must be 0x28=40 bytes
  3852. Returned value:
  3853.   * function does not return value
  3854. Format of context structure is shown in the description of
  3855. subfunction 1.
  3856. Remarks:
  3857.   * If the thread executes code of ring-0, the function returns
  3858.     contents of registers of ring-3.
  3859.   * Process must be loaded for debugging (as is shown in
  3860.     general description).
  3861.  
  3862. ======================================================================
  3863. ===== Function 69, subfunction 3 - detach from debugged process. =====
  3864. ======================================================================
  3865. Parameters:
  3866.   * eax = 69 - function number
  3867.   * ebx = 3 - subfunction number
  3868.   * ecx = identifier
  3869. Returned value:
  3870.   * function does not return value
  3871. Remarks:
  3872.   * If the process was suspended, it resumes execution.
  3873.  
  3874. ======================================================================
  3875. ======== Function 69, subfunction 4 - suspend debugged thread. =======
  3876. ======================================================================
  3877. Parameters:
  3878.   * eax = 69 - function number
  3879.   * ebx = 4 - subfunction number
  3880.   * ecx = thread identifier
  3881. Returned value:
  3882.   * function does not return value
  3883. Remarks:
  3884.   * Process must be loaded for debugging (as is shown in
  3885.     general description).
  3886.  
  3887. ======================================================================
  3888. ======== Function 69, subfunction 5 - resume debugged thread. ========
  3889. ======================================================================
  3890. Parameters:
  3891.   * eax = 69 - function number
  3892.   * ebx = 5 - subfunction number
  3893.   * ecx = thread identifier
  3894. Returned value:
  3895.   * function does not return value
  3896. Remarks:
  3897.   * Process must be loaded for debugging (as is shown in
  3898.     general description).
  3899.  
  3900. ======================================================================
  3901. = Fucntion 69, subfunction 6 - read from memory of debugged process. =
  3902. ======================================================================
  3903. Parameters:
  3904.   * eax = 69 - function number
  3905.   * ebx = 6 - subfunction number
  3906.   * ecx = identifier
  3907.   * edx = number of bytes to read
  3908.   * esi = address in the memory of debugged process
  3909.   * edi = pointer to buffer for data
  3910. Returned value:
  3911.   * eax = -1 at an error (invalid PID or buffer)
  3912.   * otherwise eax = number of read bytes (possibly, 0,
  3913.     if esi is too large)
  3914. Remarks:
  3915.   * Process must be loaded for debugging (as is shown in
  3916.     general description).
  3917.  
  3918. ======================================================================
  3919. == Function 69, subfunction 7 - write to memory of debugged process. =
  3920. ======================================================================
  3921. Parameters:
  3922.   * eax = 69 - function number
  3923.   * ebx = 7 - subfunction number
  3924.   * ecx = identifier
  3925.   * edx = number of bytes to write
  3926.   * esi = address of memory in debugged process
  3927.   * edi = pointer to data
  3928. Returned value:
  3929.   * eax = -1 at an error (invalid PID or buffer)
  3930.   * otherwise eax = number of written bytes (possibly, 0,
  3931.     if esi is too large)
  3932. Remarks:
  3933.   * Process must be loaded for debugging (as is shown in
  3934.     general description).
  3935.  
  3936. ======================================================================
  3937. ======= Function 69, subfunction 8 - terminate debugged thread. ======
  3938. ======================================================================
  3939. Parameters:
  3940.   * eax = 69 - function number
  3941.   * ebx = 8 - subfunction number
  3942.   * ecx = identifier
  3943. Returned value:
  3944.   * function does not return value
  3945. Remarks:
  3946.   * Process must be loaded for debugging (as is shown in
  3947.     general description).
  3948.   * The function is similar to subfunction 2 of function 18
  3949.     with two differences: it requires first remark and
  3950.     accepts PID rather than slot number.
  3951.  
  3952. ======================================================================
  3953. ===== Function 69, subfunction 9 - set/clear hardware breakpoint. ====
  3954. ======================================================================
  3955. Parameters:
  3956.   * eax = 69 - function number
  3957.   * ebx = 9 - subfunction number
  3958.   * ecx = thread identifier
  3959.   * dl = index of breakpoint, from 0 to 3 inclusively
  3960.   * dh = flags:
  3961.     * if high bit is cleared - set breakpoint:
  3962.       * bits 0-1 - condition:
  3963.         * 00 = breakpoint on execution
  3964.         * 01 = breakpoint on read
  3965.         * 11 = breakpoint on read/write
  3966.       * bits 2-3 - length; for breakpoints on exception it must be
  3967.         00, otherwise one of
  3968.         * 00 = byte
  3969.         * 01 = word
  3970.         * 11 = dword
  3971.       * esi = breakpoint address; must be aligned according to
  3972.         the length (i.e. must be even for word breakpoints,
  3973.         divisible by 4 for dword)
  3974.     * if high bit is set - clear breakpoint
  3975. Returned value:
  3976.   * eax = 0 - success
  3977.   * eax = 1 - error in the input data
  3978.   * eax = 2 - (reserved, is never returned in the current
  3979.     implementation) a global breakpoint with that index is already set
  3980. Remarks:
  3981.   * Process must be loaded for debugging (as is shown in
  3982.     general description).
  3983.   * Hardware breakpoints are implemented through DRx-registers of
  3984.     the processor, all limitations results from this.
  3985.   * The function can reinstall the breakpoint, previously set
  3986.     by it (and it does not inform on this).
  3987.     Carry on the list of set breakpoints in the debugger.
  3988.   * Breakpoints generate debug exception #DB, on which the system
  3989.     notifies debugger.
  3990.   * Breakpoints on write and read/write act after
  3991.     execution of the caused it instruction.
  3992.  
  3993. ======================================================================
  3994. ==== Function 70 - work with file system with long names support. ====
  3995. ======================================================================
  3996. Parameters:
  3997.   * eax = 70
  3998.   * ebx = pointer to the information structure
  3999. Returned value:
  4000.   * eax = 0 - success; otherwise file system error code
  4001.   * some subfunctions return value in other registers too
  4002. General format of the information structure:
  4003.   * +0: dword: subfunction number
  4004.   * +4: dword: file offset
  4005.   * +8: dword: high dword of offset (must be 0) or flags field
  4006.   * +12 = +0xC: dword: size
  4007.   * +16 = +0x10: dword: pointer to data
  4008.   * +20 = +0x14: n db: ASCIIZ-string with the filename
  4009.     or
  4010.   * +20 = +0x14: db 0
  4011.   * +21 = +0x15: dd pointer to ASCIIZ-string with the filename
  4012. Specifications - in documentation on the appropriate subfunction.
  4013. Filename is case-insensitive. Russian letters must be written in
  4014. the encoding cp866 (DOS).
  4015. Format of filename:
  4016. /base/number/dir1/dir2/.../dirn/file,
  4017. where /base/number identifies device, on which file is located:
  4018. one of
  4019.   * /RD/1 = /RAMDISK/1 to access ramdisk
  4020.   * /FD/1 = /FLOPPYDISK/1 to access first floppy drive,
  4021.     /FD/2 = /FLOPPYDISK/2 to access second one
  4022.   * /HD0/x, /HD1/x, /HD2/x, /HD3/x to access accordingly to devices
  4023.     IDE0 (Primary Master), IDE1 (Primary Slave),
  4024.     IDE2 (Secondary Master), IDE3 (Secondary Slave);
  4025.     x - partition number on the selected hard drive, varies from 1
  4026.     to 255 (on each hard drive the indexing starts from 1)
  4027.   * /CD0/1, /CD1/1, /CD2/1, /CD3/1 to access accordingly to
  4028.     CD on IDE0 (Primary Master), IDE1 (Primary Slave),
  4029.     IDE2 (Secondary Master), IDE3 (Secondary Slave)
  4030. Examples:
  4031.   * '/rd/1/kernel.asm',0
  4032.   * '/HD0/1/kernel.asm',0
  4033.   * '/hd0/2/menuet/pics/tanzania.bmp',0
  4034.   * '/hd0/1/Program files/NameOfProgram/SomeFile.SomeExtension',0
  4035. Available subfunctions:
  4036.   * subfunction 0 - read file
  4037.   * subfunction 1 - read folder
  4038.   * subfunction 2 - create/rewrite file
  4039.   * subfunction 5 - get attributes of file/folder
  4040.   * subfunction 6 - set attributes of file/folder
  4041.   * subfunction 7 - start application
  4042. For CD-drives due to hardware limitations only subfunctions
  4043. 0,1,5 and 7 are available, other subfunctions return error
  4044. with code 2.
  4045.  
  4046. ======================================================================
  4047. === Function 70, subfunction 0 - read file with long names support. ==
  4048. ======================================================================
  4049. Parameters:
  4050.   * eax = 70 - function number
  4051.   * ebx = pointer to the information structure
  4052. Format of the information structure:
  4053.   * +0: dword: 0 = subfunction number
  4054.   * +4: dword: file offset (in bytes)
  4055.   * +8: dword: 0 (reserved for high dword of offset)
  4056.   * +12 = +0xC: dword: number of bytes to read
  4057.   * +16 = +0x10: dword: pointer to buffer for data
  4058.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4059.     given in the general description
  4060.     or
  4061.   * +20 = +0x14: db 0
  4062.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4063. Returned value:
  4064.   * eax = 0 - success, otherwise file system error code
  4065.   * ebx = number of read bytes or -1=0xffffffff if file was not found
  4066. Remarks:
  4067.   * If file was ended before last requested block was read,
  4068.     the function will read as many as it can, and after that return
  4069.     eax=6 (EOF).
  4070.   * The function does not allow to read folder (returns eax=10,
  4071.     access denied).
  4072.  
  4073. ======================================================================
  4074. == Function 70, subfunction 1 - read folder with long names support. =
  4075. ======================================================================
  4076. Parameters:
  4077.   * eax = 70 - function number
  4078.   * ebx = pointer to the information structure
  4079. Format of the information structure:
  4080.   * +0: dword: 1 = subfunction number
  4081.   * +4: dword: index of starting block (beginning from 0)
  4082.   * +8: dword: flags field:
  4083.     * bit 0 (mask 1): in what format to return names,
  4084.       0=ANSI, 1=UNICODE
  4085.     * other bits are reserved and must be set to 0 for the future
  4086.       compatibility
  4087.   * +12 = +0xC: dword: number of blocks to read
  4088.   * +16 = +0x10: dword: pointer to buffer for data, buffer size
  4089.     must be not less than 32 + [+12]*560 bytes
  4090.   * +20 = +0x14: ASCIIZ-name of folder, the rules of names forming are
  4091.     given in the general description
  4092.     or
  4093.   * +20 = +0x14: db 0
  4094.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4095. Returned value:
  4096.   * eax = 0 - success, otherwise file system error code
  4097.   * ebx = number of files, information on which was written to
  4098.     the buffer, or -1=0xffffffff, if folder was not found
  4099. Structure of the buffer:
  4100.   * +0: 32*byte: header
  4101.   * +32 = +0x20: n1*byte: block with information on file 1
  4102.   * +32+n1: n2*byte: block with information on file 2
  4103.   * ...
  4104. Structure of header:
  4105.   * +0: dword: version of structure (current is 1)
  4106.   * +4: dword: number of placed blocks; is not greater than requested
  4107.     in the field +12 of information structure; can be less, if
  4108.     there are no more files in folder (the same as in ebx)
  4109.   * +8: dword: total number of files in folder
  4110.   * +12 = +0xC: 20*byte: reserved (zeroed)
  4111. Structure of block of data for folder entry (BDFE):
  4112.   * +0: dword: attributes of file:
  4113.     * bit 0 (mask 1): file is read-only
  4114.     * bit 1 (mask 2): file is hidden
  4115.     * bit 2 (mask 4): file is system
  4116.     * bit 3 (mask 8): this is not a file but volume label
  4117.       (for one partition meets no more than once and
  4118.       only in root folder)
  4119.     * bit 4 (mask 0x10): this is a folder
  4120.     * bit 5 (mask 0x20): file was not archived - many archivation
  4121.       programs have an option to archive only files with this bit set,
  4122.       and after archiving this bit is cleared - it can be useful
  4123.       for automatically creating of backup-archives as at writing
  4124.       this bit is usually set
  4125.   * +4: byte: type of name data:
  4126.     (coincides with bit 0 of flags in the information structure)
  4127.     * 0 = ASCII = 1-byte representation of each character
  4128.     * 1 = UNICODE = 2-byte representation of each character
  4129.   * +5: 3*byte: reserved (zero)
  4130.   * +8: 4*byte: time of file creation
  4131.   * +12 = +0xC: 4*byte: date of file creation
  4132.   * +16 = +0x10: 4*byte: time of last access (read or write)
  4133.   * +20 = +0x14: 4*byte: date of last access
  4134.   * +24 = +0x18: 4*byte: time of last modification
  4135.   * +28 = +0x1C: 4*byte: date of last modification
  4136.   * +32 = +0x20: qword: file size in bytes (up to 16777216 Tb)
  4137.   * +40 = +0x28: name
  4138.     * for ASCII format: maximum length is 263 characters
  4139.       (263 bytes), byte after the name has value 0
  4140.     * äëÿ ôîðìàòà UNICODE: maximum length is 259 characters
  4141.       (518 bytes), 2 bytes after the name have value 0
  4142. Time format:
  4143.   * +0: byte: seconds
  4144.   * +1: byte: minutes
  4145.   * +2: byte: hours
  4146.   * +3: byte: reserved (0)
  4147.   * for example, 23.59.59 is written as (in hex) 3B 3B 17 00
  4148. Date format:
  4149.   * +0: byte: day
  4150.   * +1: byte: month
  4151.   * +2: word: year
  4152.   * for example, 25.11.1979 is written as (in hex) 19 0B BB 07
  4153. Remarks:
  4154.   * If BDFE contains ASCII name, the length of BDFE is 304 bytes,
  4155.     if UNICODE name - 560 bytes. Value of length is aligned
  4156.     on 16-byte bound (to accelerate processing in CPU cache).
  4157.   * First character after a name is zero (ASCIIZ-string). The further
  4158.     data contain garbage.
  4159.   * If files in folder were ended before requested number was read,
  4160.     the function will read as many as it can, and after that return
  4161.     eax=6 (EOF).
  4162.   * Any folder on the disk, except for root, contains two special
  4163.     entries "." and "..", identifying accordingly the folder itself
  4164.     and the parent folder.
  4165.   * The function allows also to read virtual folders "/", "/rd",
  4166.     "/fd", "/hd[n]", thus attributes of subfolders are set to 0x10,
  4167.     and times and dates are zeroed. An alternative way to get the
  4168.     equipment information - subfunction 11 of function 18.
  4169.  
  4170. ======================================================================
  4171. ===================== Function 70, subfunction 2 =====================
  4172. ============ Create/rewrite file with long names support. ============
  4173. ======================================================================
  4174. Parameters:
  4175.   * eax = 70 - function number
  4176.   * ebx = pointer to the information structure
  4177. Format of the information structure:
  4178.   * +0: dword: 2 = subfunction number
  4179.   * +4: dword: 0 (reserved)
  4180.   * +8: dword: 0 (reserved)
  4181.   * +12 = +0xC: dword: number of bytes to read
  4182.   * +16 = +0x10: dword: pointer to data
  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 = number of written bytes (possibly 0)
  4191. Remarks:
  4192.   * If a file with given name did not exist, it is created;
  4193.     if it existed, it is rewritten.
  4194.   * If there is not enough free space on disk, the function will
  4195.     write as many as can and then return error code 8.
  4196.   * The function is not supported for CD (returns error code 2).
  4197.  
  4198. ======================================================================
  4199. ==== Function 70, subfunction 5 - get information on file/folder. ====
  4200. ======================================================================
  4201. Parameters:
  4202.   * eax = 70 - function number
  4203.   * ebx = pointer to the information structure
  4204. Format of the information structure:
  4205.   * +0: dword: 5 = subfunction number
  4206.   * +4: dword: 0 (reserved)
  4207.   * +8: dword: 0 (reserved)
  4208.   * +12 = +0xC: dword: 0 (reserved)
  4209.   * +16 = +0x10: dword: pointer to buffer for data (40 bytes)
  4210.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4211.     given in the general description
  4212.     or
  4213.   * +20 = +0x14: db 0
  4214.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4215. Returned value:
  4216.   * eax = 0 - success, otherwise file system error code
  4217.   * ebx destroyed
  4218. Information on file is returned in the BDFE format (block of data
  4219. for folder entry), explained in the description of
  4220. subfunction 1, but without filename
  4221. (i.e. only first 40 = 0x28 bytes).
  4222. Remarks:
  4223.   * The function does not support virtual folders such as /, /rd and
  4224.     root folders like /rd/1.
  4225.  
  4226. ======================================================================
  4227. ===== Function 70, subfunction 6 - set attributes of file/folder. ====
  4228. ======================================================================
  4229. Parameters:
  4230.   * eax = 70 - function number
  4231.   * ebx = pointer to the information structure
  4232. Format of the information structure:
  4233.   * +0: dword: 6 = subfunction number
  4234.   * +4: dword: 0 (reserved)
  4235.   * +8: dword: 0 (reserved)
  4236.   * +12 = +0xC: dword: 0 (reserved)
  4237.   * +16 = +0x10: dword: pointer to buffer with attributes (32 bytes)
  4238.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4239.     given in the general description
  4240.     or
  4241.   * +20 = +0x14: db 0
  4242.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4243. Returned value:
  4244.   * eax = 0 - success, otherwise file system error code
  4245.   * ebx destroyed
  4246. File attributes are first 32 bytes in BDFE (block of data
  4247. for folder entry), explained in the description of subfunction 1
  4248. (that is, without name and size of file). Attribute
  4249. file/folder/volume label (bits 3,4 in dword +0) is not changed.
  4250. Byte +4 (name format) is ignored.
  4251. Remarks:
  4252.   * The function does not support virtual folders such as /, /rd and
  4253.     root folders like /rd/1.
  4254.   * The function is not supported for CD (returns error code 2).
  4255.  
  4256. ======================================================================
  4257. =========== Function 70, subfunction 7 - start application. ==========
  4258. ======================================================================
  4259. Parameters:
  4260.   * eax = 70 - function number
  4261.   * ebx = pointer to the information structure
  4262. Format of the information structure:
  4263.   * +0: dword: 7 = subfunction number
  4264.   * +4: dword: flags field:
  4265.     * áèò 0: start process as debugged
  4266.     * other bits are reserved and must be set to 0
  4267.   * +8: dword: 0 or pointer to ASCIIZ-string with parameters
  4268.   * +12 = +0xC: dword: 0 (reserved)
  4269.   * +16 = +0x10: dword: 0 (reserved)
  4270.   * +20 = +0x14: ASCIIZ-name of file, the rules of names forming are
  4271.     given in the general description
  4272.     or
  4273.   * +20 = +0x14: db 0
  4274.   * +21 = +0x15: dd pointer to ASCIIZ-string with file name
  4275. Returned value:
  4276.   * eax > 0 - program is loaded, eax contains PID
  4277.   * eax < 0 - an error has occured, -eax contains
  4278.     file system error code
  4279.   * ebx destroyed
  4280. Remarks:
  4281.   * Command line must be terminated by the character with the code 0
  4282.     (ASCIIZ-string); function takes into account either all characters
  4283.     up to terminating zero inclusively or first 256 character
  4284.     regarding what is less.
  4285.   * If the process is started as debugged, it is created in
  4286.     the suspended state; to run use subfunction 5 of function 69.
  4287.  
  4288. ======================================================================
  4289. ========== Function 71, subfunction 1 - set window caption. ==========
  4290. ======================================================================
  4291. Parameters:
  4292.   * eax = 71 - function number
  4293.   * ebx = 1 - subfunction number
  4294.   * ecx = pointer to caption string
  4295. Returned value:
  4296.   * function does not return value
  4297. Remarks:
  4298.   * String must be in the ASCIIZ-format. Disregarding real string
  4299.     length, no more than 255 characters are drawn.
  4300.   * Pass NULL in ecx to remove caption.
  4301.  
  4302. ======================================================================
  4303. =============== Function -1 - terminate thread/process ===============
  4304. ======================================================================
  4305. Parameters:
  4306.   * eax = -1 - function number
  4307. Returned value:
  4308.   * function does not return neither value nor control
  4309. Remarks:
  4310.   * If the process did not create threads obviously, it has only
  4311.     one thread, which termination results in process termination.
  4312.   * If the current thread is last in the process, its termination
  4313.     also results in process terminates.
  4314.   * This function terminates the current thread. Other thread can be
  4315.     killed by call to subfunction 2 of function 18.
  4316.  
  4317. ======================================================================
  4318. =========================== List of events ===========================
  4319. ======================================================================
  4320. Next event can be retrieved by the call of one from functions 10
  4321. (to wait for event), 11 (to check without waiting), 23
  4322. (to wait during the given time).
  4323. These functions return only those events, which enter into a mask set
  4324. by function 40. By default it is first three,
  4325. there is enough for most applications.
  4326. Codes of events:
  4327.   * 1 = redraw event (is reset by call to function 0)
  4328.   * 2 = key on keyboard is pressed (acts, only when the window is
  4329.     active) or hotkey is pressed; is reset, when all keys from
  4330.     the buffer are read out by function 2
  4331.   * 3 = button is pressed, defined earlier by function 8
  4332.     (or close button, created implicitly by function 0;
  4333.     minimize button is handled by the system and sends no message;
  4334.     acts, only when the window is active;
  4335.     is reset when all buttons from the buffer
  4336.     are read out by function 17)
  4337.   * 4 = reserved (in current implementation never comes even after
  4338.     unmasking by function 40)
  4339.   * 5 = the desktop background is redrawed (is reset automatically
  4340.     after redraw, so if in redraw time program does not wait and
  4341.     does not check events, it will not remark this event)
  4342.   * 6 = mouse event (something happened - button pressing or moving;
  4343.     is reset at reading)
  4344.   * 7 = IPC event (see function 60 -
  4345.     Inter Process Communication; is reset at reading)
  4346.   * 8 = network event (is reset at reading)
  4347.   * 9 = debug event (is reset at reading; see
  4348.     debug subsystem)
  4349.   * 16..31 = event with appropriate IRQ
  4350.     (16=IRQ0, 31=IRQ15) (is reset after reading all IRQ data)
  4351.  
  4352. ======================================================================
  4353. =================== Error codes of the file system ===================
  4354. ======================================================================
  4355.   * 0 = success
  4356.   * 1 = base and/or partition of a hard disk is not defined
  4357.     (by subfunctions 7, 8 of function 21)
  4358.   * 2 = function is not supported for the given file system
  4359.   * 3 = unknown file system
  4360.   * 4 = is returned only from function 'rename' by transmission of
  4361.     the strongly incorrect parameter and in any way does not
  4362.     correspond to the description in the kernel sources
  4363.     "partition not defined at hd"
  4364.   * 5 = file not found