sysMmuMapAdd ((void *)addrLo, 
		      max (lengthLo, lengthIo),
		      VM_STATE_MASK_FOR_ALL, VM_STATE_FOR_IO);
	}
    else if ((addrLo < addrIo) && ((addrLo + lengthLo) >= addrIo)) 
	{
        sysMmuMapAdd ((void *)addrLo, 
		      max ((addrLo + lengthLo), (addrIo + lengthIo)) - addrLo,
		      VM_STATE_MASK_FOR_ALL, VM_STATE_FOR_IO);
	}
    else if ((addrIo < addrLo) && ((addrIo + lengthIo) >= addrLo))
	{
        sysMmuMapAdd ((void *)addrIo, 
		      max ((addrLo + lengthLo), (addrIo + lengthIo)) - addrIo,
		      VM_STATE_MASK_FOR_ALL, VM_STATE_FOR_IO);
	}
    else
	{
        sysMmuMapAdd ((void *)addrLo, lengthLo, 
		      VM_STATE_MASK_FOR_ALL, VM_STATE_FOR_IO);
        sysMmuMapAdd ((void *)addrIo, lengthIo, 
		      VM_STATE_MASK_FOR_ALL, VM_STATE_FOR_IO);
	}
    }
#else
    i8259Init ();
#endif	/* defined(VIRTUAL_WIRE_MODE) */
    }

/*******************************************************************************
*
* sysIntLock - lock out all interrupts
*
* This routine saves the mask and locks out all interrupts.
* It should be called in the interrupt disable state(IF bit is 0).
*
* SEE ALSO: sysIntUnlock()
*
* ARGSUSED0
*/

VOID sysIntLock (void)

    {

#if	defined(VIRTUAL_WIRE_MODE)
    loApicIntLock ();
    i8259IntLock ();
#elif	defined(SYMMETRIC_IO_MODE)
    loApicIntLock ();
    ioApicIntLock ();
#else
    i8259IntLock ();
#endif	/* defined(VIRTUAL_WIRE_MODE) */
    }

/*******************************************************************************
*
* sysIntUnlock - unlock the PIC interrupts
*
* This routine restores the mask and unlocks the PIC interrupts
* It should be called in the interrupt disable state(IF bit is 0).
*
* SEE ALSO: sysIntLock()
*
* ARGSUSED0
*/

VOID sysIntUnlock (void)

    {

#if	defined(VIRTUAL_WIRE_MODE)
    loApicIntUnlock ();
    i8259IntUnlock ();
#elif	defined(SYMMETRIC_IO_MODE)
    loApicIntUnlock ();
    ioApicIntUnlock ();
#else
    i8259IntUnlock ();
#endif	/* defined(VIRTUAL_WIRE_MODE) */
    }

/*******************************************************************************
*
* sysIntDisablePIC - disable a bus interrupt level
*
* This routine disables a specified bus interrupt level.
*
* RETURNS: OK, or ERROR if failed.
*
* ARGSUSED0
*/

STATUS sysIntDisablePIC
    (
    int irqNo		/* IRQ(PIC) or INTIN(APIC) number to disable */
    )
    {

#if	defined(VIRTUAL_WIRE_MODE)
    return (i8259IntDisable (irqNo));
#elif	defined(SYMMETRIC_IO_MODE)
    return (ioApicIntDisable (irqNo));
#else
    return (i8259IntDisable (irqNo));
#endif	/* defined(VIRTUAL_WIRE_MODE) */
    }

/*******************************************************************************
*
* sysIntEnablePIC - enable a bus interrupt level
*
* This routine enables a specified bus interrupt level.
*
* RETURNS: OK, or ERROR if failed.
*
* ARGSUSED0
*/

STATUS sysIntEnablePIC
    (
    int irqNo		/* IRQ(PIC) or INTIN(APIC) number to enable */
    )
    {

#if	defined(VIRTUAL_WIRE_MODE)
    return (i8259IntEnable (irqNo));
#elif	defined(SYMMETRIC_IO_MODE)
    return (ioApicIntEnable (irqNo));
#else
    return (i8259IntEnable (irqNo));
#endif	/* defined(VIRTUAL_WIRE_MODE) */
    }

/*******************************************************************************
*
* sysIntEoiGet - get EOI/BOI function and its parameter
*
* This routine gets EOI function and its parameter for the interrupt controller.
* If returned EOI/BOI function is NULL, intHandlerCreateX86() replaces 
* "call _routineBoi/Eoi" in intConnectCode[] with NOP instruction.
*
* RETURNS: N/A
*
* ARGSUSED0
*/

LOCAL void sysIntEoiGet
    (
    VOIDFUNCPTR * vector,	/* interrupt vector to attach to */
    VOIDFUNCPTR * routineBoi,	/* BOI function */
    int * parameterBoi,		/* a parameter of the BOI function */
    VOIDFUNCPTR * routineEoi,	/* EOI function */
    int * parameterEoi		/* a parameter of the EOI function */
    )
    {
    int vectorNo = IVEC_TO_INUM (vector);
    int irqNo;

    *routineBoi = NULL;		/* set the default value */
    *parameterBoi = 0;		/* set the default value */

#if	defined(VIRTUAL_WIRE_MODE)
    if (vectorNo == TIMER_INT_VEC)
	{
        *routineEoi   = loApicIntEoi;
        *parameterEoi = TIMER_INT_LVL;
	}
    else if (vectorNo == SPURIOUS_INT_VEC)
	{
        *routineEoi   = NULL;		/* no EOI is necessary */
        *parameterEoi = SPURIOUS_INT_LVL;
	}
    else if (vectorNo == ERROR_INT_VEC)
	{
        *routineEoi   = loApicIntEoi;
        *parameterEoi = ERROR_INT_LVL;
	}
    else
        {
        irqNo = vectorNo - INT_NUM_IRQ0;
	if ((irqNo == 7) || (irqNo == 15))
	    {
            *routineBoi   = i8259IntBoi;
            *parameterBoi = irqNo;
	    }
	if (irqNo < 8)
            *routineEoi   = i8259IntEoiMaster;
	else
            *routineEoi   = i8259IntEoiSlave;
        *parameterEoi = irqNo;
        }
#elif	defined(SYMMETRIC_IO_MODE)
    if (vectorNo == TIMER_INT_VEC)
	{
        *routineEoi   = loApicIntEoi;
        *parameterEoi = TIMER_INT_LVL;
	}
    else if (vectorNo == SPURIOUS_INT_VEC)
	{
        *routineEoi   = NULL;		/* no EOI is necessary */
        *parameterEoi = SPURIOUS_INT_LVL;
	}
    else if (vectorNo == ERROR_INT_VEC)
	{
        *routineEoi   = loApicIntEoi;
        *parameterEoi = ERROR_INT_LVL;
	}
    else
        {
        for (irqNo = 0; irqNo < NELEMENTS (redTable); irqNo++)
	    if (redTable [irqNo].vectorNo == vectorNo)
	        break;
        *routineEoi   = ioApicIntEoi;
        *parameterEoi = irqNo;
        }
#else
    irqNo = vectorNo - INT_NUM_IRQ0;
    if ((irqNo == 7) || (irqNo == 15))
        {
        *routineBoi   = i8259IntBoi;
        *parameterBoi = irqNo;
        }
    if (irqNo < 8)
        *routineEoi   = i8259IntEoiMaster;
    else
        *routineEoi   = i8259IntEoiSlave;
    *parameterEoi = irqNo;
#endif	/* defined(VIRTUAL_WIRE_MODE) */
    }

/*******************************************************************************
*
* sysIntLevel - get an IRQ(PIC) or INTIN(APIC) number in service
*
* This routine gets an IRQ(PIC) or INTIN(APIC) number in service.  
* We assume followings:
*   - this function is called in intEnt()
*   - IRQ number of the interrupt is at intConnectCode [29]
*
* RETURNS: 0 - (NUMBER_OF_IRQS - 1), or NUMBER_OF_IRQS if we failed to get it.
*
* ARGSUSED0
*/

#ifdef	SYS_INT_DEBUG
UINT32 sysIntCount[NUMBER_OF_IRQS + 1];
#endif	/* SYS_INT_DEBUG */

int sysIntLevel 
    (
    int arg		/* parameter to get the stack pointer */
    )
    {
    UINT32 * pStack;
    UCHAR * pInst;
    int ix;
    int irqNo = NUMBER_OF_IRQS;	/* return NUMBER_OF_IRQS if we failed */

    pStack = &arg;		/* get the stack pointer */
    pStack += 3;		/* skip pushed volitile registers */

    /* 
     * we are looking for a return address on the stack which point
     * to the next instruction of "call _intEnt" in the malloced stub.
     * Then get the irqNo at intConnectCode [29].
     */

    for (ix = 0; ix < 10; ix++, pStack++)
	{
	pInst = (UCHAR *)*pStack;		/* return address */
	if ((*pInst == 0x50) && 		/* intConnectCode [5] */
	    ((*(int *)(pInst - 4) + (int)pInst) == (int)intEnt))
	    {
    	    irqNo = *(int *)(pInst + 24);	/* intConnectCode [29] */
	    break;
	    }
	}

#ifdef	SYS_INT_DEBUG
    sysIntCount[irqNo]++;
#endif	/* SYS_INT_DEBUG */

    return (irqNo);
    }

/****************************************************************************
*
* sysProcNumGet - get the processor number
*
* This routine returns the processor number for the CPU board, which is
* set with sysProcNumSet().
*
* RETURNS: The processor number for the CPU board.
*
* SEE ALSO: sysProcNumSet()
*/

int sysProcNumGet (void)

    {
    return (sysProcNum);
    }


/****************************************************************************
*
* sysProcNumSet - set the processor number
*
* Set the processor number for the CPU board.  Processor numbers should be
* unique on a single backplane.
*
* NOTE: By convention, only Processor 0 should dual-port its memory.
*
* RETURNS: N/A
*
* SEE ALSO: sysProcNumGet()
*/

void sysProcNumSet
    (
    int procNum		/* processor number */
    )
    {
    sysProcNum = procNum;
    }

/*******************************************************************************
*
* sysDelay - allow recovery time for port accesses
*
* This routine provides a brief delay used between accesses to the same serial
* port chip.
* 
* RETURNS: N/A
*/

void sysDelay (void)
    {
    char ix;

    ix = sysInByte (UNUSED_ISA_IO_ADDRESS);	/* it takes 720ns */
    }

/*******************************************************************************
*
* sysStrayInt - Do nothing for stray interrupts.
*
* Do nothing for stray interrupts.
*/

LOCAL void sysStrayInt (void)
    {
    sysStrayIntCount++;
    }

/*******************************************************************************
*
* sysMmuMapAdd - insert a new mmu mapping
*
* This routine adds a new mmu mapping entry to allow dynamic mappings. 
*
* RETURNS: OK or ERROR depending on availability of free mappings.
*/  

STATUS sysMmuMapAdd 
    (
    void *address,
    UINT length,
    UINT initialStateMask,
    UINT initialState
    )
    {
    PHYS_MEM_DESC *pMmu;
    STATUS result = OK;

    pMmu = &sysPhysMemDesc[sysPhysMemDescNumEnt];
  
    if(pMmu->virtualAddr != (void *)DUMMY_VIRT_ADDR)
        result = ERROR;
    else
        {
        pMmu->virtualAddr = address;
        pMmu->physicalAddr = address;
        pMmu->len = length;
        pMmu->initialStateMask = initialStateMask;
        pMmu->initialState = initialState;
        sysPhysMemDescNumEnt += 1;
        }
   
    return (result);
    }