miscemu/int25.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "registers.h"
   5 #include "msdos.h"
   6 #include "segmem.h"
   7 #include "wine.h"
   8 #include "miscemu.h"
   9 #include "stddebug.h"
  10 /* #define DEBUG_INT */
  11 #include "debug.h"
  12
  13 int do_int25(struct sigcontext_struct *context)
  14 {
  15         BYTE *dataptr = SAFEMAKEPTR(DS, BX);
  16         DWORD begin, length;
  17
  18         if (CX == 0xffff) {
  19                 begin = getdword(dataptr);
  20                 length = getword(&dataptr[4]);
  21                 dataptr = (BYTE *) getdword(&dataptr[6]);
  22
  23         } else {
  24                 begin = DX;
  25                 length = CX;
  26         }
  27         dprintf_int(stdnimp, "int25: abs diskread, drive %d, sector %ld, "
  28         "count %ld, buffer %d\n", EAX & 0xff, begin, length, (int) dataptr);
  29
  30         memset(dataptr, 0, length * 512);
  31
  32         if (begin == 0 && length > 1)
  33                 *(dataptr + 512) = 0xf8;
  34
  35         if (begin == 1)
  36                 *dataptr = 0xf8;
  37
  38         ResetCflag;
  39
  40         /* push flags on stack */
  41         SP -= sizeof(WORD);
  42         setword(SAFEMAKEPTR(SS,SP), (WORD) EFL);
  43
  44         return 1;
  45 }