/*++


Copyright (C) 1989-1995  Microsoft Corporation

Module Name:

    pxsysbus.c

Abstract:

Author:

Environment:

Revision History:
                Jim Wooldridge - IBM
		- ported to PowerPC
      9/26/95	Steve Johns - Motorola
		- use BusInterruptLevel instead of BusInterruptVector


--*/

#include "halp.h"

#include "eisa.h"
#include "pxmemctl.h"
#include "pxsiosup.h"
#include "pxsystyp.h"

KIRQL HalpTranslateVectorToIrql(IN ULONG Vector);


BOOLEAN
HalpTranslateSystemBusAddress(
    IN PBUS_HANDLER BusHandler,
    IN PBUS_HANDLER RootHandler,
    IN PHYSICAL_ADDRESS BusAddress,
    IN OUT PULONG AddressSpace,
    OUT PPHYSICAL_ADDRESS TranslatedAddress
    );

ULONG
HalpGetSystemInterruptVector(
    IN PBUS_HANDLER BusHandler,
    IN PBUS_HANDLER RootHandler,
    IN ULONG BusInterruptLevel,
    IN ULONG BusInterruptVector,
    OUT PKIRQL Irql,
    OUT PKAFFINITY Affinity
    );


#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE,HalpGetSystemInterruptVector)
#endif


BOOLEAN
HalpTranslateSystemBusAddress(
    IN PBUS_HANDLER BusHandler,
    IN PBUS_HANDLER RootHandler,
    IN PHYSICAL_ADDRESS BusAddress,
    IN OUT PULONG AddressSpace,
    OUT PPHYSICAL_ADDRESS TranslatedAddress
    )

/*++

Routine Description:

    This function translates a bus-relative address space and address into
    a system physical address.

Arguments:

    BusAddress        - Supplies the bus-relative address

    AddressSpace      -  Supplies the address space number.
                         Returns the host address space number.

                         AddressSpace == 0 => memory space
                         AddressSpace == 1 => I/O space

    TranslatedAddress - Supplies a pointer to return the translated address

Return Value:

    A return value of TRUE indicates that a system physical address
    corresponding to the supplied bus relative address and bus address
    number has been returned in TranslatedAddress.

    A return value of FALSE occurs if the translation for the address was
    not possible

--*/

{
    PSUPPORTED_RANGE    pRange;

    pRange = NULL;
    switch (*AddressSpace) {
        case 0:
            // verify memory address is within buses memory limits
            for (pRange = &BusHandler->BusAddresses->PrefetchMemory; pRange; pRange = pRange->Next) {
                if (BusAddress.QuadPart >= pRange->Base &&
                    BusAddress.QuadPart <= pRange->Limit) {
                        break;
                }
            }

            if (!pRange) {
                for (pRange = &BusHandler->BusAddresses->Memory; pRange; pRange = pRange->Next) {
                    if (BusAddress.QuadPart >= pRange->Base &&
                        BusAddress.QuadPart <= pRange->Limit) {
                            break;
                    }
                }
            }

            break;

        case 1:
            // verify IO address is within buses IO limits
            for (pRange = &BusHandler->BusAddresses->IO; pRange; pRange = pRange->Next) {
                if (BusAddress.QuadPart >= pRange->Base &&
                    BusAddress.QuadPart <= pRange->Limit) {
                        break;
                }
            }
            break;
    }

    if (pRange) {
        TranslatedAddress->QuadPart = BusAddress.QuadPart + pRange->SystemBase;
        *AddressSpace = pRange->SystemAddressSpace;
        return TRUE;
    }

    return FALSE;
}


ULONG
HalpGetSystemInterruptVector(
    IN PBUS_HANDLER BusHandler,
    IN PBUS_HANDLER RootHandler,
    IN ULONG BusInterruptLevel,
    IN ULONG BusInterruptVector,
    OUT PKIRQL Irql,
    OUT PKAFFINITY Affinity
    )

/*++

Routine Description:

Arguments:

    BusInterruptLevel - Supplies the bus specific interrupt level.

    BusInterruptVector - Supplies the bus specific interrupt vector.

    Irql - Returns the system request priority.

    Affinity - Returns the system wide irq affinity.

Return Value:

    Returns the system interrupt vector corresponding to the specified device.

--*/
{

    UNREFERENCED_PARAMETER( BusHandler );
    UNREFERENCED_PARAMETER( RootHandler );
    UNREFERENCED_PARAMETER( BusInterruptVector );


    if (BusInterruptLevel > HIGHEST_8259_VECTOR) {
        //
      // Invalid BusInterruptLevel, so return Affinity of 0x0000;
        //
      *Affinity = 0;
      return(DEVICE_VECTORS);

    } else {

      *Affinity = 1;

      //
      // Translate BusInterruptLevel to IRQL
      //
      *Irql = HalpTranslateVectorToIrql(BusInterruptLevel);

      //
      // The vector is equal to the specified bus level + DEVICE_VECTORS.
      //
      return(BusInterruptLevel + DEVICE_VECTORS);

    }
}