Sweden-Number/msdos/int25.c

74 lines
2.1 KiB
C

/*
* DOS interrupt 25h handler
*
* Copyright 1997 Andreas Mohr
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "msdos.h"
#include "miscemu.h"
#include "drive.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(int);
/**********************************************************************
* INT_Int25Handler (WPROCS.137)
*
* Handler for int 25h (absolute disk read).
*/
void WINAPI INT_Int25Handler( CONTEXT86 *context )
{
BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
DWORD begin, length;
if (!DRIVE_IsValid(LOBYTE(context->Eax)))
{
SET_CFLAG(context);
AX_reg(context) = 0x0201; /* unknown unit */
return;
}
if (LOWORD(context->Ecx) == 0xffff)
{
begin = *(DWORD *)dataptr;
length = *(WORD *)(dataptr + 4);
dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
*(WORD *)(dataptr + 8), *(DWORD *)(dataptr + 6) );
}
else
{
begin = LOWORD(context->Edx);
length = LOWORD(context->Ecx);
}
TRACE("int25: abs diskread, drive %d, sector %ld, "
"count %ld, buffer %p\n",
LOBYTE(context->Eax), begin, length, dataptr);
DRIVE_RawRead(LOBYTE(context->Eax), begin, length, dataptr, TRUE);
RESET_CFLAG(context);
}