miscemu/int25.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "registers.h"
   4 #include "msdos.h"
   5 #include "wine.h"
   6
   7 int do_int25(struct sigcontext_struct *context)
   8 {
   9         BYTE *dataptr = pointer(DS, BX);
  10         DWORD begin, length;
  11
  12         if (CX == 0xffff) {
  13                 begin = getdword(dataptr);
  14                 length = getword(&dataptr[4]);
  15                 dataptr = (BYTE *) getdword(&dataptr[6]);
  16
  17         } else {
  18                 begin = DX;
  19                 length = CX;
  20         }
  21         fprintf(stderr, "int25: abs diskread, drive %d, sector %d, "
  22         "count %d, buffer %d\n", EAX & 0xff, begin, length, (int) dataptr);
  23
  24         memset(dataptr, 0, length * 512);
  25
  26         if (begin == 0 && length > 1)
  27                 *(dataptr + 512) = 0xf8;
  28
  29         if (begin == 1)
  30                 *dataptr = 0xf8;
  31
  32         ResetCflag;
  33
  34         /* push flags on stack */
  35         SP -= sizeof(WORD);
  36         setword(pointer(SS,SP), (WORD) EFL);
  37
  38         return 1;
  39 }