msdos/interrupts.c

/*
 * Interrupt vectors emulation
 *
 * Copyright 1995 Alexandre Julliard
 */

#include <sys/types.h>

#include "windows.h"
#include "drive.h"
#include "miscemu.h"
#include "msdos.h"
#include "module.h"
#include "stackframe.h"
#include "debug.h"

static FARPROC16 INT_Vectors[256];


/**********************************************************************
 *	    INT_GetPMHandler
 *
 * Return the protected mode interrupt vector for a given interrupt.
 */
FARPROC16 INT_GetPMHandler( BYTE intnum )
{
    return INT_Vectors[intnum];
}


/**********************************************************************
 *	    INT_SetPMHandler
 *
 * Set the protected mode interrupt handler for a given interrupt.
 */
void INT_SetPMHandler( BYTE intnum, FARPROC16 handler )
{
    TRACE(int, "Set protected mode interrupt vector %02x <- %04x:%04x\n",
                 intnum, HIWORD(handler), LOWORD(handler) );
    INT_Vectors[intnum] = handler;
}


/**********************************************************************
 *	    INT_GetRMHandler
 *
 * Return the real mode interrupt vector for a given interrupt.
 */
FARPROC16 INT_GetRMHandler( BYTE intnum )
{
    return ((FARPROC16*)DOSMEM_MemoryBase(0))[intnum];
}


/**********************************************************************
 *	    INT_SetRMHandler
 *
 * Set the real mode interrupt handler for a given interrupt.
 */
void INT_SetRMHandler( BYTE intnum, FARPROC16 handler )
{
    TRACE(int, "Set real mode interrupt vector %02x <- %04x:%04x\n",
                 intnum, HIWORD(handler), LOWORD(handler) );
    ((FARPROC16*)DOSMEM_MemoryBase(0))[intnum] = handler;
}


/**********************************************************************
 *	    INT_CtxGetHandler
 *
 * Return the interrupt vector for a given interrupt.
 */
FARPROC16 INT_CtxGetHandler( CONTEXT *context, BYTE intnum )
{
    if (ISV86(context))
        return ((FARPROC16*)V86BASE(context))[intnum];
    else
        return INT_GetPMHandler(intnum);
}


/**********************************************************************
 *	    INT_CtxSetHandler
 *
 * Set the interrupt handler for a given interrupt.
 */
void INT_CtxSetHandler( CONTEXT *context, BYTE intnum, FARPROC16 handler )
{
    if (ISV86(context)) {
        TRACE(int, "Set real mode interrupt vector %02x <- %04x:%04x\n",
                     intnum, HIWORD(handler), LOWORD(handler) );
        ((FARPROC16*)V86BASE(context))[intnum] = handler;
    } else
        INT_SetPMHandler(intnum, handler);
}


/**********************************************************************
 *	    INT_RealModeInterrupt
 *
 * Handle real mode interrupts
 */
int INT_RealModeInterrupt( BYTE intnum, PCONTEXT context )
{
    /* we should really map to if1632/wprocs.spec, but not all
     * interrupt handlers are adapted to support real mode yet */
    switch (intnum) {
        case 0x10:
            INT_Int10Handler(context);
            break;
        case 0x1a:
            INT_Int1aHandler(context);
            break;
        case 0x20:
            INT_Int20Handler(context);
            break;
        case 0x21:
            DOS3Call(context);
            break;
        case 0x25:
            INT_Int25Handler(context);
            break;
        case 0x2f:
            INT_Int2fHandler(context);
            break;
        case 0x31:
            INT_Int31Handler(context);
            break;
        default:
            FIXME(int, "Unknown Interrupt in DOS mode: 0x%x\n", intnum);
            return 1;
    }
    return 0;
}