miscemu/int26.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "registers.h"
   4 #include "msdos.h"
   5 #include "ldt.h"
   6 #include "wine.h"
   7 #include "miscemu.h"
   8 #include "drive.h"
   9 #include "stddebug.h"
  10 /* #define DEBUG_INT */
  11 #include "debug.h"
  12
  13 /**********************************************************************
  14  *          INT_Int26Handler
  15  *
  16  * Handler for int 26h (absolute disk read).
  17  */
  18 void INT_Int26Handler( struct sigcontext_struct context )
  19 {
  20     BYTE *dataptr = PTR_SEG_OFF_TO_LIN( DS_reg(&context), BX_reg(&context) );
  21     DWORD begin, length;
  22
  23     if (!DRIVE_IsValid(AL_reg(&context)))
  24     {
  25         SET_CFLAG(&context);
  26         AX_reg(&context) = 0x0101;        /* unknown unit */
  27         return;
  28     }
  29
  30     if (CX_reg(&context) == 0xffff)
  31     {
  32         begin   = *(DWORD *)dataptr;
  33         length  = *(WORD *)(dataptr + 4);
  34         dataptr = (BYTE *)PTR_SEG_TO_LIN( *(SEGPTR *)(dataptr + 6) );
  35     }
  36     else
  37     {
  38         begin = DX_reg(&context);
  39         length = CX_reg(&context);
  40     }
  41
  42     dprintf_int( stdnimp,"int26: abs diskwrite, drive %d, sector %ld, "
  43                  "count %ld, buffer %d\n",
  44                  AL_reg(&context), begin, length, (int) dataptr );
  45
  46     RESET_CFLAG(&context);
  47 }