msdos/int25.c

   1 /*
   2  * DOS interrupt 25h handler
   3  *
   4  * Copyright 1997 Andreas Mohr
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <fcntl.h>
  26 #ifdef HAVE_UNISTD_H
  27 # include <unistd.h>
  28 #endif
  29 #include "msdos.h"
  30 #include "miscemu.h"
  31 #include "drive.h"
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(int);
  35
  36
  37 /**********************************************************************
  38  *          INT_Int25Handler (WPROCS.137)
  39  *
  40  * Handler for int 25h (absolute disk read).
  41  */
  42 void WINAPI INT_Int25Handler( CONTEXT86 *context )
  43 {
  44     BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
  45     DWORD begin, length;
  46
  47     if (!DRIVE_IsValid(LOBYTE(context->Eax)))
  48     {
  49         SET_CFLAG(context);
  50         SET_AX( context, 0x0201 );        /* unknown unit */
  51         return;
  52     }
  53
  54     if (LOWORD(context->Ecx) == 0xffff)
  55     {
  56         begin   = *(DWORD *)dataptr;
  57         length  = *(WORD *)(dataptr + 4);
  58         dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
  59                                         *(WORD *)(dataptr + 8), *(DWORD *)(dataptr + 6) );
  60     }
  61     else
  62     {
  63         begin  = LOWORD(context->Edx);
  64         length = LOWORD(context->Ecx);
  65     }
  66     TRACE("int25: abs diskread, drive %d, sector %ld, "
  67                  "count %ld, buffer %p\n",
  68           LOBYTE(context->Eax), begin, length, dataptr);
  69
  70     DRIVE_RawRead(LOBYTE(context->Eax), begin, length, dataptr, TRUE);
  71     RESET_CFLAG(context);
  72 }