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Assembly Source File  |  1994-06-05  |  2.3 KB  |  70 lines
  1. ; 8-Sep-86 16:23:47-PDT,1765;000000000000
  2. ; Return-Path: <pwu@unix.macc.wisc.edu>
  3. ; Received: FROM UNIX.MACC.WISC.EDU BY B.ISI.EDU WITH TCP ; 8 Sep 86 16:19:46 PDT
  4. ; Received: by unix.macc.wisc.edu;
  5. ;           id AA04919; 4.12/5; Mon, 8 Sep 86 17:30:29 cdt
  6. ; Date: Mon, 8 Sep 86 17:30:29 cdt
  7. ; From: Peter Wu <pwu@unix.macc.wisc.edu>
  8. ; Message-Id: <8609082230.AA04919@unix.macc.wisc.edu>
  9. ; To: info-ibmpc-request@mosis
  10. ; Subject: absdr.asm
  11. ; 
  12. ; bios call to do absolute disk read/write
  13. ; using int86 from C to call int 25h and 26h will freeze the computer
  14. ; (because si and di were modified?), so I had to write this in assembly.
  15.  
  16. _text   segment public byte 'code'
  17.         assume cs:_text
  18.  
  19.         public  _absdr          ; absolute disk read
  20. _absdr  proc    near
  21.         push    si
  22.         push    di
  23.         push    bp
  24.         mov     bp,sp
  25.  
  26.         mov     al,[bp+8]       ; drive number
  27.         mov     cx,[bp+10]      ; number of sectors to read
  28.         mov     dx,[bp+12]      ; beginning sector number
  29.         mov     bx,[bp+14]      ; buffer address
  30.         int     25h             ; absolute disk read
  31. ; int 25h supposed to destroy all registers except segment registers
  32.         jc      error           ; if error, leave error no in AX
  33.         mov     ax,0            ; clear error number if no error
  34. error:
  35.         inc     sp              ; pop the flags
  36.         inc     sp              ; pop the flags
  37.         pop     bp
  38.         pop     di
  39.         pop     si
  40.         ret
  41. _absdr  endp
  42.  
  43.         public  _absdw          ; absolute disk write
  44. _absdw  proc    near
  45.         push    si
  46.         push    di
  47.         push    bp
  48.         mov     bp,sp
  49.  
  50.         mov     al,[bp+8]       ; drive number
  51.         mov     cx,[bp+10]      ; number of sectors to read
  52.         mov     dx,[bp+12]      ; beginning sector number
  53.         mov     bx,[bp+14]      ; buffer address
  54.         int     26h             ; absolute disk read
  55. ; int 26h supposed to destroy all registers except segment registers
  56.         jc      error1          ; if error, leave error no in AX
  57.         mov     ax,0            ; clear error number if no error
  58. error1:
  59.         inc     sp              ; pop the flags
  60.         inc     sp              ; pop the flags
  61.         pop     bp
  62.         pop     di
  63.         pop     si
  64.         ret
  65. _absdw  endp
  66.  
  67. _text   ends
  68.         end
  69. ;
  70.