miscemu/int25.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "registers.h"
   4 #include "msdos.h"
   5 #include "wine.h"
   6 #include "stddebug.h"
   7 /* #define DEBUG_INT */
   8 /* #undef  DEBUG_INT */
   9 #include "debug.h"
  10
  11 int do_int25(struct sigcontext_struct *context)
  12 {
  13         BYTE *dataptr = pointer(DS, BX);
  14         DWORD begin, length;
  15
  16         if (CX == 0xffff) {
  17                 begin = getdword(dataptr);
  18                 length = getword(&dataptr[4]);
  19                 dataptr = (BYTE *) getdword(&dataptr[6]);
  20
  21         } else {
  22                 begin = DX;
  23                 length = CX;
  24         }
  25         dprintf_int(stdnimp, "int25: abs diskread, drive %d, sector %d, "
  26         "count %d, buffer %d\n", EAX & 0xff, begin, length, (int) dataptr);
  27
  28         memset(dataptr, 0, length * 512);
  29
  30         if (begin == 0 && length > 1)
  31                 *(dataptr + 512) = 0xf8;
  32
  33         if (begin == 1)
  34                 *dataptr = 0xf8;
  35
  36         ResetCflag;
  37
  38         /* push flags on stack */
  39         SP -= sizeof(WORD);
  40         setword(pointer(SS,SP), (WORD) EFL);
  41
  42         return 1;
  43 }