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55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/*
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* DOS interrupt 25h handler
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "msdos.h"
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#include "ldt.h"
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#include "miscemu.h"
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#include "drive.h"
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#include "debugtools.h"
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DEFAULT_DEBUG_CHANNEL(int)
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/**********************************************************************
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* INT_Int25Handler
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*
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* Handler for int 25h (absolute disk read).
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*/
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void WINAPI INT_Int25Handler( CONTEXT86 *context )
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{
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BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, DS_reg(context), EBX_reg(context) );
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DWORD begin, length;
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if (!DRIVE_IsValid(AL_reg(context)))
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{
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SET_CFLAG(context);
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AX_reg(context) = 0x0201; /* unknown unit */
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return;
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}
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if (CX_reg(context) == 0xffff)
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{
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begin = *(DWORD *)dataptr;
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length = *(WORD *)(dataptr + 4);
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dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
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*(WORD *)(dataptr + 8), *(DWORD *)(dataptr + 6) );
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}
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else
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{
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begin = DX_reg(context);
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length = CX_reg(context);
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}
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TRACE("int25: abs diskread, drive %d, sector %ld, "
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"count %ld, buffer %p\n",
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AL_reg(context), begin, length, dataptr);
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DRIVE_RawRead(AL_reg(context), begin, length, dataptr, TRUE);
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RESET_CFLAG(context);
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}
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