Sweden-Number/miscemu/int26.c

48 lines
1.2 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include "registers.h"
#include "msdos.h"
#include "ldt.h"
#include "wine.h"
#include "miscemu.h"
#include "drive.h"
#include "stddebug.h"
/* #define DEBUG_INT */
#include "debug.h"
/**********************************************************************
* INT_Int26Handler
*
* Handler for int 26h (absolute disk read).
*/
void INT_Int26Handler( struct sigcontext_struct context )
{
BYTE *dataptr = PTR_SEG_OFF_TO_LIN( DS_reg(&context), BX_reg(&context) );
DWORD begin, length;
if (!DRIVE_IsValid(AL_reg(&context)))
{
SET_CFLAG(&context);
AX_reg(&context) = 0x0101; /* unknown unit */
return;
}
if (CX_reg(&context) == 0xffff)
{
begin = *(DWORD *)dataptr;
length = *(WORD *)(dataptr + 4);
dataptr = (BYTE *)PTR_SEG_TO_LIN( *(SEGPTR *)(dataptr + 6) );
}
else
{
begin = DX_reg(&context);
length = CX_reg(&context);
}
dprintf_int( stdnimp,"int26: abs diskwrite, drive %d, sector %ld, "
"count %ld, buffer %d\n",
AL_reg(&context), begin, length, (int) dataptr );
RESET_CFLAG(&context);
}