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