msdos/int26.c

   1 /*
   2  * DOS interrupt 26h 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 <fcntl.h>
  25 #ifdef HAVE_UNISTD_H
  26 # include <unistd.h>
  27 #endif
  28 #include "msdos.h"
  29 #include "miscemu.h"
  30 #include "drive.h"
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(int);
  34
  35 /**********************************************************************
  36  *          INT_Int26Handler (WPROCS.138)
  37  *
  38  * Handler for int 26h (absolute disk read).
  39  */
  40 void WINAPI INT_Int26Handler( CONTEXT86 *context )
  41 {
  42     BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
  43     DWORD begin, length;
  44
  45     if (!DRIVE_IsValid(LOBYTE(context->Eax)))
  46     {
  47         SET_CFLAG(context);
  48         SET_AX( context, 0x0201 );        /* unknown unit */
  49         return;
  50     }
  51
  52     if (LOWORD(context->Ecx) == 0xffff)
  53     {
  54         begin   = *(DWORD *)dataptr;
  55         length  = *(WORD *)(dataptr + 4);
  56         dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
  57                                         *(WORD *)(dataptr + 8), *(DWORD *)(dataptr + 6) );
  58     }
  59     else
  60     {
  61         begin  = LOWORD(context->Edx);
  62         length = LOWORD(context->Ecx);
  63     }
  64
  65     TRACE("int26: abs diskwrite, drive %d, sector %ld, "
  66                  "count %ld, buffer %p\n",
  67                  AL_reg(context), begin, length, dataptr );
  68
  69     DRIVE_RawWrite(LOBYTE(context->Eax), begin, length, dataptr, TRUE);
  70     RESET_CFLAG(context);
  71 }