/*++

Copyright (c) 1997  Microsoft Corporation

Module Name:

    ixpnpdrv.c

Abstract:

    Implements functionality necessary for the
    HAL to become a PnP-style device driver
    after system initialization.  This is done
    so that the HAL can enumerate the ACPI driver
    in the way that the PnP stuff expects.

Author:

    Jake Oshins (jakeo) 27-Jan-1997

Environment:

    Kernel mode only.

Revision History:

--*/

#include "halp.h"
#include "exboosts.h"
#include "wchar.h"

//
// Cause the GUID to be defined.
//

#include "initguid.h"
#include "wdmguid.h"
#include "halpnpp.h"

#if DBG
ULONG HalDebug = 0;
#endif

extern WCHAR HalHardwareIdString[];

typedef enum {
    Hal = 0x80,
    AcpiDriver
} PDO_TYPE;

typedef enum {
    PdoExtensionType = 0xc0,
    FdoExtensionType
} EXTENSION_TYPE;

typedef struct _PDO_EXTENSION *PPDO_EXTENSION;
typedef struct _FDO_EXTENSION *PFDO_EXTENSION;

typedef struct _PDO_EXTENSION{
    EXTENSION_TYPE                  ExtensionType;
    PPDO_EXTENSION                  Next;
    PDEVICE_OBJECT                  PhysicalDeviceObject;
    PFDO_EXTENSION                  ParentFdoExtension;
    PDO_TYPE                        PdoType;
    LONG                            InterfaceReferenceCount;
} PDO_EXTENSION, *PPDO_EXTENSION;

#define ASSERT_PDO_EXTENSION(x) ASSERT((x)->ExtensionType == PdoExtensionType );

typedef struct _FDO_EXTENSION{
    EXTENSION_TYPE        ExtensionType;
    PPDO_EXTENSION        ChildPdoList;
    PDEVICE_OBJECT        PhysicalDeviceObject;  // PDO passed into AddDevice()
    PDEVICE_OBJECT        FunctionalDeviceObject;
    PDEVICE_OBJECT        AttachedDeviceObject;
} FDO_EXTENSION, *PFDO_EXTENSION;

#define ASSERT_FDO_EXTENSION(x) ASSERT((x)->ExtensionType == FdoExtensionType );

INT_ROUTE_INTERFACE_STANDARD PciIrqRoutingInterface = {0};

NTSTATUS
HalpDriverEntry (
    IN PDRIVER_OBJECT DriverObject,
    IN PUNICODE_STRING RegistryPath
    );

NTSTATUS
HalpAddDevice(
    IN PDRIVER_OBJECT DriverObject,
    IN PDEVICE_OBJECT PhysicalDeviceObject
    );

NTSTATUS
HalpDispatchPnp(
    IN PDEVICE_OBJECT DeviceObject,
    IN OUT PIRP Irp
    );

NTSTATUS
HalpDispatchWmi(
    IN PDEVICE_OBJECT DeviceObject,
    IN OUT PIRP Irp
    );

NTSTATUS
HalpDispatchPower(
    IN PDEVICE_OBJECT DeviceObject,
    IN OUT PIRP Irp
    );

NTSTATUS
HalpQueryDeviceRelations(
    IN PDEVICE_OBJECT       DeviceObject,
    IN DEVICE_RELATION_TYPE RelationType,
    OUT PDEVICE_RELATIONS *DeviceRelations
    );

NTSTATUS
HalpQueryIdPdo(
    IN PDEVICE_OBJECT PdoExtension,
    IN BUS_QUERY_ID_TYPE IdType,
    IN OUT PWSTR *BusQueryId
    );

NTSTATUS
HalpQueryIdFdo(
    IN PDEVICE_OBJECT PdoExtension,
    IN BUS_QUERY_ID_TYPE IdType,
    IN OUT PWSTR *BusQueryId
    );

NTSTATUS
HalpQueryCapabilities(
    IN PDEVICE_OBJECT PdoExtension,
    IN PDEVICE_CAPABILITIES Capabilities
    );

NTSTATUS
HalpQueryResources(
    PDEVICE_OBJECT DeviceObject,
    PCM_RESOURCE_LIST *Resources
    );

NTSTATUS
HalpQueryResourceRequirements(
    PDEVICE_OBJECT DeviceObject,
    PIO_RESOURCE_REQUIREMENTS_LIST *Requirements
    );

NTSTATUS
HalpQueryInterface(
    IN     PDEVICE_OBJECT   DeviceObject,
    IN     LPCGUID          InterfaceType,
    IN     USHORT           Version,
    IN     PVOID            InterfaceSpecificData,
    IN     ULONG            InterfaceBufferSize,
    IN OUT PINTERFACE       Interface,
    IN OUT PULONG           Length
    );

#ifdef WANT_IRQ_ROUTING

NTSTATUS
HalpQueryInterfaceFdo(
    IN     PDEVICE_OBJECT   DeviceObject,
    IN     LPCGUID          InterfaceType,
    IN     USHORT           Version,
    IN     PVOID            InterfaceSpecificData,
    IN     ULONG            InterfaceBufferSize,
    IN OUT PINTERFACE       Interface,
    IN OUT PULONG           Length
    );

#endif

NTSTATUS
HalIrqTranslateResourcesRoot(
    IN PVOID Context,
    IN PCM_PARTIAL_RESOURCE_DESCRIPTOR Source,
    IN RESOURCE_TRANSLATION_DIRECTION Direction,
    IN ULONG AlternativesCount, OPTIONAL
    IN IO_RESOURCE_DESCRIPTOR Alternatives[], OPTIONAL
    IN PDEVICE_OBJECT PhysicalDeviceObject,
    OUT PCM_PARTIAL_RESOURCE_DESCRIPTOR Target
);

NTSTATUS
HalIrqTranslateResourceRequirementsRoot(
    IN PVOID Context,
    IN PIO_RESOURCE_DESCRIPTOR Source,
    IN PDEVICE_OBJECT PhysicalDeviceObject,
    OUT PULONG TargetCount,
    OUT PIO_RESOURCE_DESCRIPTOR *Target
);

VOID
HalpMaskAcpiInterrupt(
    VOID
    );

VOID
HalpUnmaskAcpiInterrupt(
    VOID
    );

// from xxacpi.c
NTSTATUS
HalpQueryAcpiResourceRequirements(
    IN  PIO_RESOURCE_REQUIREMENTS_LIST *Requirements
    );

VOID
HalpMarkAcpiHal(
    VOID
    );

NTSTATUS
HalpOpenRegistryKey(
    OUT PHANDLE Handle,
    IN HANDLE BaseHandle OPTIONAL,
    IN PUNICODE_STRING KeyName,
    IN ACCESS_MASK DesiredAccess,
    IN BOOLEAN Create
    );

//
//  Define the PNP interface functions.
//

VOID
HalPnpInterfaceReference(
    PVOID Context
    );

VOID
HalPnpInterfaceDereference(
    PVOID Context
    );

BOOLEAN
HalPnpTranslateBusAddress(
    IN PVOID Context,
    IN PHYSICAL_ADDRESS BusAddress,
    IN ULONG Length,
    IN OUT PULONG AddressSpace,
    OUT PPHYSICAL_ADDRESS TranslatedAddress
    );

struct _DMA_ADAPTER *
HalPnpGetDmaAdapter(
    IN PVOID Context,
    IN struct _DEVICE_DESCRIPTION *DeviceDescriptor,
    OUT PULONG NumberOfMapRegisters
    );

BOOLEAN
HalpFakeAcpiRegisters(
    VOID
    );

#define HAL_DRIVER_NAME  L"\\Driver\\ACPI_HAL"

#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, HaliInitPnpDriver)
#pragma alloc_text(PAGE, HalpMarkAcpiHal)
#pragma alloc_text(PAGE, HalpOpenRegistryKey)
#pragma alloc_text(PAGE, HalpDispatchPnp)
#pragma alloc_text(PAGE, HalpAddDevice)
#pragma alloc_text(PAGE, HalpDriverEntry)
#pragma alloc_text(PAGE, HalpQueryDeviceRelations)
#pragma alloc_text(PAGE, HalpQueryIdPdo)
#pragma alloc_text(PAGE, HalpQueryIdFdo)
#pragma alloc_text(PAGE, HalpQueryCapabilities)
#pragma alloc_text(PAGE, HalpQueryResources)
#pragma alloc_text(PAGE, HalpQueryResourceRequirements)
#pragma alloc_text(PAGE, HalpQueryInterface)
#ifdef WANT_IRQ_ROUTING
#pragma alloc_text(PAGE, HalpQueryInterfaceFdo)
#endif
#pragma alloc_text(PAGELK, HalpDispatchPower)
#pragma alloc_text(PAGE, HalpDispatchWmi)
#endif

PDRIVER_OBJECT HalpDriverObject;


NTSTATUS
HaliInitPnpDriver(
    VOID
    )
/*++

Routine Description:

    This routine starts the process of making the HAL into
    a "driver," which is necessary because we need to
    enumerate a Plug and Play PDO for the ACPI driver.

Arguments:

    DriverName - Unicode string that will be used for the
                 driver object.

Return Value:

    status

--*/
{

    UNICODE_STRING  DriverName;
    NTSTATUS Status;

    PAGED_CODE();

    RtlInitUnicodeString( &DriverName, HAL_DRIVER_NAME );

    Status = IoCreateDriver( &DriverName, HalpDriverEntry );

    HalpMarkAcpiHal();

    ASSERT( NT_SUCCESS( Status ));

    return Status;

}

VOID
HalpMarkAcpiHal(
    VOID
    )

/*++

Routine Description:


Arguments:

    None.

Return Value:

    None.

--*/
{
    ULONG tmpValue;
    UNICODE_STRING unicodeString;
    HANDLE hCurrentControlSet, handle;
    NTSTATUS status;

    PAGED_CODE();

    //
    // Open/create System\CurrentControlSet key.
    //

    RtlInitUnicodeString(&unicodeString, L"\\REGISTRY\\MACHINE\\SYSTEM\\CURRENTCONTROLSET");
    status = HalpOpenRegistryKey (
                 &hCurrentControlSet,
                 NULL,
                 &unicodeString,
                 KEY_ALL_ACCESS,
                 FALSE
                 );
    if (!NT_SUCCESS(status)) {
        return;
    }

    //
    // Open HKLM\System\CurrentControlSet\Control\Pnp
    //

    RtlInitUnicodeString(&unicodeString, L"Control\\Pnp");
    status = HalpOpenRegistryKey (
                 &handle,
                 hCurrentControlSet,
                 &unicodeString,
                 KEY_ALL_ACCESS,
                 TRUE
                 );
    ZwClose(hCurrentControlSet);
    if (!NT_SUCCESS(status)) {
        return;
    }

    RtlInitUnicodeString(&unicodeString, L"DisableFirmwareMapper");
    tmpValue = 1;
    ZwSetValueKey(handle,
                  &unicodeString,
                  0,
                  REG_DWORD,
                  &tmpValue,
                  sizeof(tmpValue)
                  );
    ZwClose(handle);
}

NTSTATUS
HalpOpenRegistryKey(
    OUT PHANDLE Handle,
    IN HANDLE BaseHandle OPTIONAL,
    IN PUNICODE_STRING KeyName,
    IN ACCESS_MASK DesiredAccess,
    IN BOOLEAN Create
    )

/*++

Routine Description:

    Opens or creates a VOLATILE registry key using the name passed in based
    at the BaseHandle node.

Arguments:

    Handle - Pointer to the handle which will contain the registry key that
        was opened.

    BaseHandle - Handle to the base path from which the key must be opened.

    KeyName - Name of the Key that must be opened/created.

    DesiredAccess - Specifies the desired access that the caller needs to
        the key.

    Create - Determines if the key is to be created if it does not exist.

Return Value:

   The function value is the final status of the operation.

--*/

{
    OBJECT_ATTRIBUTES objectAttributes;
    ULONG disposition;

    PAGED_CODE();

    //
    // Initialize the object for the key.
    //

    InitializeObjectAttributes( &objectAttributes,
                                KeyName,
                                OBJ_CASE_INSENSITIVE,
                                BaseHandle,
                                (PSECURITY_DESCRIPTOR) NULL );

    //
    // Create the key or open it, as appropriate based on the caller's
    // wishes.
    //

    if (Create) {
        return ZwCreateKey( Handle,
                            DesiredAccess,
                            &objectAttributes,
                            0,
                            (PUNICODE_STRING) NULL,
                            REG_OPTION_VOLATILE,
                            &disposition );
    } else {
        return ZwOpenKey( Handle,
                          DesiredAccess,
                          &objectAttributes );
    }
}

NTSTATUS
HalpDriverEntry (
    IN PDRIVER_OBJECT DriverObject,
    IN PUNICODE_STRING RegistryPath
    )

/*++

Routine Description:

    This is the callback function when we call IoCreateDriver to create a
    PnP Driver Object.  In this function, we need to remember the DriverObject.

Arguments:

    DriverObject - Pointer to the driver object created by the system.

    RegistryPath - is NULL.

Return Value:

   STATUS_SUCCESS

--*/
{
    NTSTATUS status;
    PDEVICE_OBJECT detectedDeviceObject = NULL;
    ANSI_STRING    AKeyName;

    PAGED_CODE();

    //
    // File the pointer to our driver object away
    //
    HalpDriverObject = DriverObject;

    //
    // Fill in the driver object
    //
    DriverObject->DriverExtension->AddDevice = (PDRIVER_ADD_DEVICE)HalpAddDevice;
    DriverObject->MajorFunction[ IRP_MJ_PNP ] = HalpDispatchPnp;
    DriverObject->MajorFunction[ IRP_MJ_POWER ] = HalpDispatchPower;
    DriverObject->MajorFunction[ IRP_MJ_SYSTEM_CONTROL ] = HalpDispatchWmi;

    status = IoReportDetectedDevice(DriverObject,
                                    InterfaceTypeUndefined,
                                    -1,
                                    -1,
                                    NULL,
                                    NULL,
                                    FALSE,
                                    &detectedDeviceObject);

    ASSERT(detectedDeviceObject);
    if (!(NT_SUCCESS(status))) {
        return status;
    }

    HalpAddDevice(DriverObject,
                  detectedDeviceObject);

    return STATUS_SUCCESS;

}

NTSTATUS
HalpAddDevice(
    IN PDRIVER_OBJECT DriverObject,
    IN PDEVICE_OBJECT PhysicalDeviceObject
    )

/*++

Routine Description:

    This routine handles AddDevice for an madeup PDO device.

Arguments:

    DriverObject - Pointer to our pseudo driver object.

    DeviceObject - Pointer to the device object for which this requestapplies.

Return Value:

    NT status.

--*/
{
    PDEVICE_OBJECT functionalDeviceObject;
    PDEVICE_OBJECT childDeviceObject;
    PDEVICE_OBJECT AttachedDevice;
    NTSTATUS       status;
    PFDO_EXTENSION FdoExtension;
    PPDO_EXTENSION PdoExtension;

    PAGED_CODE();

    //
    // We've been given the PhysicalDeviceObject.  Create the
    // FunctionalDeviceObject.  Our FDO will be nameless.
    //

    status = IoCreateDevice(
                DriverObject,               // our driver object
                sizeof(FDO_EXTENSION),      // size of our extension
                NULL,                       // our name
                FILE_DEVICE_BUS_EXTENDER,   // device type
                0,                          // device characteristics
                FALSE,                      // not exclusive
                &functionalDeviceObject     // store new device object here
                );

    if( !NT_SUCCESS( status )){

        DbgBreakPoint();
        return status;
    }

    //
    // Fill in the FDO extension
    //
    FdoExtension = (PFDO_EXTENSION)functionalDeviceObject->DeviceExtension;
    FdoExtension->ExtensionType = FdoExtensionType;
    FdoExtension->PhysicalDeviceObject = PhysicalDeviceObject;
    FdoExtension->FunctionalDeviceObject = functionalDeviceObject;

    functionalDeviceObject->Flags &= ~(DO_DEVICE_INITIALIZING);

    //
    // Now attach to the PDO we were given.
    //

    AttachedDevice = IoAttachDeviceToDeviceStack(functionalDeviceObject,
                                                 PhysicalDeviceObject );
    if(AttachedDevice == NULL){

        //
        // Couldn't attach.  Delete the FDO.
        //

        IoDeleteDevice( functionalDeviceObject );

        return STATUS_NO_SUCH_DEVICE;

    }

    FdoExtension->AttachedDeviceObject = AttachedDevice;

    //
    // Next, create a PDO for the ACPI driver.
    //
    status = IoCreateDevice(
                DriverObject,               // our driver object
                sizeof(PDO_EXTENSION),      // size of our extension
                NULL,                       // our name
                FILE_DEVICE_BUS_EXTENDER,   // device type
                FILE_AUTOGENERATED_DEVICE_NAME, // device characteristics
                FALSE,                      // not exclusive
                &childDeviceObject          // store new device object here
                );

    if (!NT_SUCCESS(status)) {
        return status;
    }

    //
    // Fill in the PDO extension
    //
    PdoExtension = (PPDO_EXTENSION)childDeviceObject->DeviceExtension;
    PdoExtension->ExtensionType = PdoExtensionType;
    PdoExtension->Next = NULL;
    PdoExtension->PhysicalDeviceObject = childDeviceObject;
    PdoExtension->ParentFdoExtension = FdoExtension;
    PdoExtension->PdoType = AcpiDriver;

    childDeviceObject->Flags &= ~(DO_DEVICE_INITIALIZING);
    //
    // Record this as a child of the HAL
    //
    FdoExtension->ChildPdoList = PdoExtension;

    return STATUS_SUCCESS;
}

NTSTATUS
HalpPassIrpFromFdoToPdo(
    PDEVICE_OBJECT DeviceObject,
    PIRP Irp
    )

/*++

Description:

    Given an FDO, pass the IRP to the next device object in the
    device stack.  This is the PDO if there are no lower level
    filters.

Arguments:

    DeviceObject - the Fdo
    Irp - the request

Return Value:

    Returns the result from calling the next level.

--*/

{

    PIO_STACK_LOCATION irpSp;       // our stack location
    PIO_STACK_LOCATION nextIrpSp;   // next guy's
    PFDO_EXTENSION     fdoExtension;

    //
    // Get the pointer to the device extension.
    //

    fdoExtension = (PFDO_EXTENSION)DeviceObject->DeviceExtension;

    IoSkipCurrentIrpStackLocation(Irp);

    //
    // Call the PDO driver with the request.
    //

    return IoCallDriver(fdoExtension->AttachedDeviceObject ,Irp);
}

NTSTATUS
HalpDispatchPnp(
    IN PDEVICE_OBJECT DeviceObject,
    IN OUT PIRP Irp
    )

/*++

Routine Description:

    This routine handles all IRP_MJ_PNP IRPs for madeup PDO device.

Arguments:

    DeviceObject - Pointer to the device object for which this IRP applies.

    Irp - Pointer to the IRP_MJ_PNP IRP to dispatch.

Return Value:

    NT status.

--*/
{
    PIO_STACK_LOCATION irpSp;
    NTSTATUS status;
    ULONG length;
    DEVICE_RELATION_TYPE relationType;
    EXTENSION_TYPE  extensionType;
    BOOLEAN passDown;
    PUCHAR objectTypeString;

    PAGED_CODE();

    extensionType = ((PFDO_EXTENSION)(DeviceObject->DeviceExtension))->ExtensionType;

    //
    // Get a pointer to our stack location and take appropriate action based
    // on the minor function.
    //

    irpSp = IoGetCurrentIrpStackLocation(Irp);
    status = Irp->IoStatus.Status;
    switch (extensionType) {

    case PdoExtensionType:

        objectTypeString = "PDO";

        switch (irpSp->MinorFunction) {

        case IRP_MN_START_DEVICE:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Start_Device Irp received\n",
                            objectTypeString ));

            //
            // If we get a start device request for a PDO, we simply
            // return success.
            //

            status = STATUS_SUCCESS;
            break;

        case IRP_MN_QUERY_STOP_DEVICE:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Stop_Device Irp received",
                            objectTypeString));

            status = STATUS_SUCCESS;
            break;

        case IRP_MN_CANCEL_STOP_DEVICE:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Cancel_Stop_Device Irp received",
                            objectTypeString ));

            status = STATUS_SUCCESS;
            break;


        case IRP_MN_STOP_DEVICE:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Stop_Device Irp received\n",
                            objectTypeString ));

            //
            // If we get a stop device request for a PDO, we simply
            // return success.
            //

            status = STATUS_SUCCESS;
            break;

        case IRP_MN_QUERY_RESOURCES:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Resources Irp received\n",
                            objectTypeString ));

            status = HalpQueryResources(DeviceObject,
                         (PCM_RESOURCE_LIST*)&Irp->IoStatus.Information);

            break;

        case IRP_MN_QUERY_RESOURCE_REQUIREMENTS:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Resource_Requirements Irp received\n",
                           objectTypeString ));

            status = HalpQueryResourceRequirements(DeviceObject,
                         (PIO_RESOURCE_REQUIREMENTS_LIST*)&Irp->IoStatus.Information);
            break;

        case IRP_MN_QUERY_REMOVE_DEVICE:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Remove_device Irp for %p",
                            objectTypeString,
                            DeviceObject ));

            status = STATUS_UNSUCCESSFUL;
            break;

        case IRP_MN_CANCEL_REMOVE_DEVICE:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Cancel_Remove_device Irp for %p",
                            objectTypeString,
                            DeviceObject));

            status = STATUS_SUCCESS;
            break;

        case IRP_MN_REMOVE_DEVICE:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Remove_device Irp for PDO %p\n",
                            objectTypeString,
                            DeviceObject ));

            status = STATUS_SUCCESS;
            break;

        case IRP_MN_QUERY_DEVICE_RELATIONS:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Device_Relations Irp received\n",
                            objectTypeString ));

            relationType = irpSp->Parameters.QueryDeviceRelations.Type;
            status = HalpQueryDeviceRelations(DeviceObject,
                                              relationType,
                                              (PDEVICE_RELATIONS*)&Irp->IoStatus.Information);
            break;


        case IRP_MN_QUERY_ID:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Id Irp received\n",
                            objectTypeString ));

            status = HalpQueryIdPdo(DeviceObject,
                                 irpSp->Parameters.QueryId.IdType,
                                 (PWSTR*)&Irp->IoStatus.Information);

            break;

        case IRP_MN_QUERY_INTERFACE:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Interface Irp received\n",
                            objectTypeString));

            status = HalpQueryInterface(
                         DeviceObject,
                         irpSp->Parameters.QueryInterface.InterfaceType,
                         irpSp->Parameters.QueryInterface.Version,
                         irpSp->Parameters.QueryInterface.InterfaceSpecificData,
                         irpSp->Parameters.QueryInterface.Size,
                         irpSp->Parameters.QueryInterface.Interface,
                         (PULONG)&Irp->IoStatus.Information
                         );
            break;

        case IRP_MN_QUERY_CAPABILITIES:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Capabilities Irp received\n",
                            objectTypeString));

            status = HalpQueryCapabilities(DeviceObject,
                                           irpSp->Parameters.DeviceCapabilities.Capabilities);

            break;

        case IRP_MN_DEVICE_USAGE_NOTIFICATION:
            HalDebugPrint(( HAL_PNP, "HAL: DEVICE_USAGE Irp received\n" ));
            status = STATUS_SUCCESS;
            break;

        default:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Unsupported Irp (%d) received\n",
                            objectTypeString,
                            irpSp->MinorFunction));
            status = STATUS_NOT_SUPPORTED ;
            break;
        }

        break;  // end PDO cases

    case FdoExtensionType:

        objectTypeString = "FDO";
        passDown = TRUE;

        //
        // In case we don't touch this IRP, save the current status.
        //

        switch (irpSp->MinorFunction) {

        case IRP_MN_QUERY_DEVICE_RELATIONS:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Device_Relations Irp received\n",
                            objectTypeString));

            relationType = irpSp->Parameters.QueryDeviceRelations.Type;
            status = HalpQueryDeviceRelations(DeviceObject,
                                              relationType,
                                              (PDEVICE_RELATIONS*)&Irp->IoStatus.Information);
            break;

        case IRP_MN_QUERY_INTERFACE:

#ifdef WANT_IRQ_ROUTING
        case IRP_MN_QUERY_INTERFACE:

            HalDebugPrint(( HAL_PNP, "(%s) Query_Interface Irp received",
                       objectTypeString));
            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Interface Irp received",
                            objectTypeString ));
            Status = HalpQueryInterfaceFdo(
                         DeviceObject,
                         irpSp->Parameters.QueryInterface.InterfaceType,
                         irpSp->Parameters.QueryInterface.Version,
                         irpSp->Parameters.QueryInterface.InterfaceSpecificData,
                         irpSp->Parameters.QueryInterface.Size,
                         irpSp->Parameters.QueryInterface.Interface,
                         &Irp->IoStatus.Information
                         );
            break;

#endif

        case IRP_MN_QUERY_ID:

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Query_Id Irp received\n",
                            objectTypeString ));

            status = HalpQueryIdFdo(DeviceObject,
                                 irpSp->Parameters.QueryId.IdType,
                                 (PWSTR*)&Irp->IoStatus.Information);

            break;

        default:

            //
            // Ignore any PNP Irps unknown by the FDO but allow them
            // down to the PDO.
            //

            status = STATUS_NOT_SUPPORTED ;
            break;
        }

        if (passDown && (NT_SUCCESS(status) || (status == STATUS_NOT_SUPPORTED))) {

            //
            // Pass FDO IRPs down to the PDO.
            //
            // Set Irp status first.
            //
            if (status != STATUS_NOT_SUPPORTED) {

                Irp->IoStatus.Status = status;
            }

            HalDebugPrint(( HAL_PNP, "HAL: (%s) Passing down Irp (%x)\n",
                            objectTypeString, irpSp->MinorFunction ));
            return HalpPassIrpFromFdoToPdo(DeviceObject, Irp);
        }

        break;  // end FDO cases

    default:

        HalDebugPrint(( HAL_PNP, "HAL: Received IRP for unknown Device Object\n" ));
        status = STATUS_INVALID_DEVICE_REQUEST ;
        break;

    }

    //
    // Complete the Irp and return.
    //

    if (status != STATUS_NOT_SUPPORTED) {

        Irp->IoStatus.Status = status;

    } else {

        status = Irp->IoStatus.Status ;
    }

    IoCompleteRequest(Irp, IO_NO_INCREMENT);

    return status;
}

NTSTATUS
HalpDispatchPower(
    IN PDEVICE_OBJECT DeviceObject,
    IN OUT PIRP Irp
    )

/*++

Routine Description:

    This routine handles all IRP_MJ_POWER IRPs for madeup PDO device.
    Note: We don't actually handle any Power IRPs at this level so
    all we do is return the status from the incoming IRP.

Arguments:

    DeviceObject - Pointer to the device object for which this IRP applies.

    Irp - Pointer to the IRP_MJ_POWER IRP to dispatch.

Return Value:

    NT status.

--*/
{
    NTSTATUS Status;
    EXTENSION_TYPE  extensionType;
    PIO_STACK_LOCATION irpSp;

    HalDebugPrint(( HAL_PNP, "HAL:  Power IRP for DevObj: %p\n", DeviceObject ));

    extensionType = ((PFDO_EXTENSION)(DeviceObject->DeviceExtension))->ExtensionType;

    irpSp = IoGetCurrentIrpStackLocation(Irp);

    //
    // Simply store the appropriate status and complete the request.
    //

    Status = Irp->IoStatus.Status;

    PoStartNextPowerIrp(Irp);

    if (extensionType == FdoExtensionType) {

        switch (irpSp->MinorFunction) {
        case IRP_MN_SET_POWER:

            if (irpSp->Parameters.Power.Type == SystemPowerState) {

                if (irpSp->Parameters.Power.State.SystemState ==
                    PowerSystemWorking) {

                    HalpUnmaskAcpiInterrupt();

                } else {

                    HalpMaskAcpiInterrupt();
                }
            }

            //
            // Fall through.
            //

        case IRP_MN_QUERY_POWER:

            Irp->IoStatus.Status = Status = STATUS_SUCCESS;

            //
            // Fall through.
            //

        default:

            Status = HalpPassIrpFromFdoToPdo(DeviceObject, Irp);
            break;
        }

    } else {

        switch (irpSp->MinorFunction) {
        case IRP_MN_SET_POWER:
        case IRP_MN_QUERY_POWER:

            Irp->IoStatus.Status = Status = STATUS_SUCCESS;

            //
            // Fall through.
            //

        default:
            IoCompleteRequest( Irp, IO_NO_INCREMENT );
            break;
        }
    }

    return Status;
}

NTSTATUS
HalpDispatchWmi(
    IN PDEVICE_OBJECT DeviceObject,
    IN OUT PIRP Irp
    )
{
    NTSTATUS Status;
    EXTENSION_TYPE  extensionType;

    extensionType = ((PFDO_EXTENSION)(DeviceObject->DeviceExtension))->ExtensionType;

    if (extensionType == FdoExtensionType) {
        Status = HalpPassIrpFromFdoToPdo(DeviceObject, Irp);
    } else {
        Status = Irp->IoStatus.Status;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
    }

    return Status;
}

NTSTATUS
HalpQueryDeviceRelations(
    IN PDEVICE_OBJECT       DeviceObject,
    IN DEVICE_RELATION_TYPE RelationType,
    OUT PDEVICE_RELATIONS   *DeviceRelations
    )
/*++

Routine Description:

    This routine builds a DEVICE_RELATIONS structure that
    tells the PnP manager how many children we have.

Arguments:

    DeviceObject - FDO of ACPI_HAL

    RelationType - we only respond to BusRelations

    DeviceRelations - pointer to the structure

Return Value:

    status

--*/
{
    PFDO_EXTENSION  FdoExtension;
    PDEVICE_RELATIONS   relations = NULL;
    PDEVICE_OBJECT deviceObjectToReturn ;
    EXTENSION_TYPE  extensionType;
    NTSTATUS status ;

    PAGED_CODE();

    FdoExtension = (PFDO_EXTENSION)DeviceObject->DeviceExtension;
    extensionType = FdoExtension->ExtensionType;
    status = STATUS_NOT_SUPPORTED ;

    switch(RelationType) {

        case BusRelations:

            if (extensionType == FdoExtensionType) {
                deviceObjectToReturn = FdoExtension->ChildPdoList->PhysicalDeviceObject ;
                status = STATUS_SUCCESS ;
            }
            break;

        case TargetDeviceRelation:

            if (extensionType == PdoExtensionType) {

                deviceObjectToReturn = DeviceObject ;
                status = STATUS_SUCCESS ;
            }
            break;
    }

    if (status == STATUS_NOT_SUPPORTED) {

        HalDebugPrint(( HAL_PNP, "HAL:  We don't support this kind of device relation\n" ));

    } else if (NT_SUCCESS(status)) {

        ASSERT(*DeviceRelations == 0);

        relations = ExAllocatePoolWithTag(
            PagedPool,
            sizeof(DEVICE_RELATIONS),
            HAL_POOL_TAG
            );

        if (!relations) {

            status = STATUS_INSUFFICIENT_RESOURCES;

        } else {

            relations->Count = 1;
            relations->Objects[0] = deviceObjectToReturn ;

            ObReferenceObject(relations->Objects[0]);
            *DeviceRelations = relations;
        }
    }

    return status ;
}

NTSTATUS
HalpQueryIdPdo(
    IN PDEVICE_OBJECT DeviceObject,
    IN BUS_QUERY_ID_TYPE IdType,
    IN OUT PWSTR *BusQueryId
    )
/*++

Routine Description:

    This routine identifies each of the children that were
    enumerated in HalpQueryDeviceRelations.

Arguments:

    DeviceObject - PDO of the child

    IdType - the type of ID to be returned, currently ignored

    BusQueryId - pointer to the wide string being returned

Return Value:

    status

--*/
{
    PPDO_EXTENSION  PdoExtension = DeviceObject->DeviceExtension;
    PWSTR idString;
    PWCHAR sourceString;
    ULONG stringLen;
    static WCHAR AcpiHardwareIdString[] = L"ACPI_HAL\\PNP0C08\0*PNP0C08";
    static WCHAR AcpiCompatibleString[] = L"*PNP0C08";
    static WCHAR AcpiInstanceIdString[] = L"0";

    PAGED_CODE();

    switch (IdType) {
    case BusQueryDeviceID:
    case BusQueryHardwareIDs:

        switch (PdoExtension->PdoType) {
        case AcpiDriver:
            sourceString = AcpiHardwareIdString;
            stringLen = sizeof(AcpiHardwareIdString);
            break;

        default:
            return STATUS_NOT_SUPPORTED;

        }
        break;

    case BusQueryCompatibleIDs:
        return STATUS_NOT_SUPPORTED;
        break;

    case BusQueryInstanceID:
        sourceString = AcpiInstanceIdString;
        stringLen = sizeof(AcpiInstanceIdString);
        break;

    default:
        return STATUS_NOT_SUPPORTED;
    }

    idString = ExAllocatePoolWithTag(PagedPool,
                                     stringLen + sizeof(UNICODE_NULL),
                                     HAL_POOL_TAG);

    if (!idString) {
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    RtlCopyMemory(idString,
                  sourceString, stringLen);

    *(idString + stringLen / sizeof(WCHAR)) = UNICODE_NULL;

    *BusQueryId = idString;

    return STATUS_SUCCESS;
}
NTSTATUS
HalpQueryIdFdo(
    IN PDEVICE_OBJECT DeviceObject,
    IN BUS_QUERY_ID_TYPE IdType,
    IN OUT PWSTR *BusQueryId
    )
/*++

Routine Description:

    This routine identifies each of the children that were
    enumerated in HalpQueryDeviceRelations.

Arguments:

    DeviceObject - PDO of the child

    IdType - the type of ID to be returned.

    BusQueryId - pointer to the wide string being returned

Return Value:

    status

--*/
{
    PPDO_EXTENSION  PdoExtension = DeviceObject->DeviceExtension;
    PWSTR idString;
    PWCHAR sourceString = NULL;
    ULONG stringLen;
    UNICODE_STRING String;
    WCHAR Buffer[16];
    NTSTATUS Status;
    PWCHAR widechar;
    static WCHAR HalInstanceIdString[] = L"0";

    PAGED_CODE();

    switch (IdType) {
    case BusQueryDeviceID:
    case BusQueryHardwareIDs:

        sourceString = HalHardwareIdString;
        widechar = (PWCHAR)&HalHardwareIdString;
        while (*widechar != 0) widechar++;
        stringLen =  (ULONG)((PUCHAR)widechar - ((PUCHAR)&HalHardwareIdString) + 2);

        break;

    case BusQueryInstanceID:

        sourceString = HalInstanceIdString;
        stringLen = sizeof(HalInstanceIdString);
        break;

    default:
        break;
    }
    if (sourceString) {

        //
        // Note that hardware IDs and compatible IDs must be terminated by
        // 2 NULLs.
        //

        idString = ExAllocatePoolWithTag(PagedPool,
                                         stringLen + sizeof(UNICODE_NULL),
                                         HAL_POOL_TAG);

        if (!idString) {
            HalDebugPrint(( HAL_PNP, "HalpQueryIdFdo: couldn't allocate pool\n" ));
            return STATUS_INSUFFICIENT_RESOURCES;
        }

        RtlCopyMemory(idString,
                      sourceString, stringLen);

        *(idString + stringLen / sizeof(WCHAR)) = UNICODE_NULL;

        *BusQueryId = idString;

        return STATUS_SUCCESS;
    } else {
        return STATUS_NOT_SUPPORTED;
    }
}

NTSTATUS
HalpQueryCapabilities(
    IN PDEVICE_OBJECT PdoExtension,
    IN PDEVICE_CAPABILITIES Capabilities
    )
/*++

Routine Description:

    This routine fills in the DEVICE_CAPABILITIES structure for
    a device.

Arguments:

    DeviceObject - PDO of the child

    Capabilities - pointer to the structure to be filled in.

Return Value:

    status

--*/
{
    PAGED_CODE();

    ASSERT(Capabilities->Version == 1);
    if (Capabilities->Version != 1) {

        return STATUS_NOT_SUPPORTED;

    }

    Capabilities->LockSupported = FALSE;
    Capabilities->EjectSupported = FALSE;
    Capabilities->Removable = FALSE;
    Capabilities->DockDevice = FALSE;
    Capabilities->UniqueID = TRUE;
    Capabilities->SilentInstall = TRUE;
    Capabilities->RawDeviceOK = FALSE;
    Capabilities->Address = 0xffffffff;
    Capabilities->UINumber = 0xffffffff;
    Capabilities->D1Latency = 0;
    Capabilities->D2Latency = 0;
    Capabilities->D3Latency = 0;

    //
    // Default S->D mapping
    //
    Capabilities->DeviceState[PowerSystemWorking] = PowerDeviceD0;
    Capabilities->DeviceState[PowerSystemHibernate] = PowerDeviceD3;
    Capabilities->DeviceState[PowerSystemShutdown] = PowerDeviceD3;

    return STATUS_SUCCESS;
}

NTSTATUS
HalpQueryResources(
    PDEVICE_OBJECT DeviceObject,
    PCM_RESOURCE_LIST *Resources
    )
{
    PIO_RESOURCE_REQUIREMENTS_LIST requirements;
    PPDO_EXTENSION  PdoExtension = DeviceObject->DeviceExtension;
    PIO_RESOURCE_DESCRIPTOR descriptor;
    PCM_RESOURCE_LIST cmResList;
    NTSTATUS status;
    ULONG i;

    PAGED_CODE();

    if (PdoExtension->PdoType == AcpiDriver) {

        //
        // The whole point behind creating a boot config for the
        // ACPI PDO is that the PnP Manager will not terminate
        // its algorithm that tries to reserve boot configs for
        // all of ACPI's children.  So it is not necessary that
        // ACPI have a complicated list of resources in its boot
        // config.  We'll be happy with just the IRQ.
        //
        // N.B.  At the time of this writing, it should also be
        // true that the IRQ is the only resource that the ACPI
        // claims anyhow.
        //

        status = HalpQueryAcpiResourceRequirements(&requirements);

        if (!NT_SUCCESS(status)) {
            return status;
        }

        cmResList = ExAllocatePoolWithTag(PagedPool,
                                          sizeof(CM_RESOURCE_LIST),
                                          HAL_POOL_TAG);

        if (!cmResList) {
            ExFreePool(requirements);
            return STATUS_INSUFFICIENT_RESOURCES;
        }

        RtlZeroMemory(cmResList, sizeof(CM_RESOURCE_LIST));

        cmResList->Count = 1;
        cmResList->List[0].InterfaceType = PNPBus;
        cmResList->List[0].BusNumber     = -1;
        cmResList->List[0].PartialResourceList.Version = 1;
        cmResList->List[0].PartialResourceList.Revision = 1;
        cmResList->List[0].PartialResourceList.Count = 1;
        cmResList->List[0].PartialResourceList.PartialDescriptors[0].Type =
            CmResourceTypeInterrupt;

        ASSERT(requirements->AlternativeLists == 1);

        for (i = 0; i < requirements->List[0].Count; i++) {

            descriptor = &requirements->List[0].Descriptors[i];

            if (descriptor->Type == CmResourceTypeInterrupt) {

                cmResList->List[0].PartialResourceList.PartialDescriptors[0].ShareDisposition =
                    descriptor->ShareDisposition;
                cmResList->List[0].PartialResourceList.PartialDescriptors[0].Flags =
                    descriptor->Flags;

                ASSERT(descriptor->u.Interrupt.MinimumVector ==
                       descriptor->u.Interrupt.MaximumVector);

                cmResList->List[0].PartialResourceList.PartialDescriptors[0].u.Interrupt.Level =
                    descriptor->u.Interrupt.MinimumVector;

                cmResList->List[0].PartialResourceList.PartialDescriptors[0].u.Interrupt.Vector =
                    descriptor->u.Interrupt.MinimumVector;

                cmResList->List[0].PartialResourceList.PartialDescriptors[0].u.Interrupt.Affinity = -1;

                *Resources = cmResList;

                ExFreePool(requirements);
                return STATUS_SUCCESS;
            }
        }

        ExFreePool(requirements);
        ExFreePool(cmResList);
        return STATUS_NOT_FOUND;

    } else {
        return STATUS_NOT_SUPPORTED;
    }
}


NTSTATUS
HalpQueryResourceRequirements(
    IN  PDEVICE_OBJECT DeviceObject,
    IN  PIO_RESOURCE_REQUIREMENTS_LIST *Requirements
    )
/*++

Routine Description:

    This routine handles IRP_MN_QUERY_RESOURCE_REQUIREMENTS.

Arguments:

    DeviceObject - PDO of the child

    Requirements - pointer to be filled in with the devices
        resource requirements.

Return Value:

    status

--*/
{
    PPDO_EXTENSION  PdoExtension = DeviceObject->DeviceExtension;

    PAGED_CODE();

    if (PdoExtension->PdoType == AcpiDriver) {

        return HalpQueryAcpiResourceRequirements(Requirements);

    } else {
        return STATUS_NOT_SUPPORTED;
    }
}

NTSTATUS
HalpQueryInterface(
    IN     PDEVICE_OBJECT   DeviceObject,
    IN     LPCGUID          InterfaceType,
    IN     USHORT           Version,
    IN     PVOID            InterfaceSpecificData,
    IN     ULONG            InterfaceBufferSize,
    IN OUT PINTERFACE       Interface,
    IN OUT PULONG           Length
    )

/*++

Routine Description:

    This routine fills in the interface structure for a device.

Arguments:

    DeviceObject            - PDO of the child
    InterfaceType           - Pointer to the interface type GUID.
    Version                 - Supplies the requested interface version.
    InterfaceSpecificData   - This is context that means something based on the interface.
    Interface Buffer Size   - Supplies the length of a buffer for the interface structure.
    Interface               - Supplies a pointer where interference information should be returned.ointer to the supplied interface buffer.
    Length                  - The value is updated on return to actual number of bytes modified.

Return Value:

    status

--*/
{
    PPDO_EXTENSION PdoExtension = (PPDO_EXTENSION)DeviceObject->DeviceExtension;
    CM_RESOURCE_TYPE resource = (CM_RESOURCE_TYPE)(INT_PTR)InterfaceSpecificData;

    PAGED_CODE();

    ASSERT_PDO_EXTENSION(PdoExtension);

    if (IsEqualGUID(&GUID_BUS_INTERFACE_STANDARD, InterfaceType)) {

        PBUS_INTERFACE_STANDARD standard = (PBUS_INTERFACE_STANDARD)Interface;

        //
        // ASSERT we know about all of the fields in the structure.
        //

        ASSERT(sizeof(BUS_INTERFACE_STANDARD) == FIELD_OFFSET(BUS_INTERFACE_STANDARD, GetBusData) + sizeof(PGET_SET_DEVICE_DATA));

        *Length = sizeof(BUS_INTERFACE_STANDARD);

        if (InterfaceBufferSize < sizeof(BUS_INTERFACE_STANDARD)) {
            return STATUS_BUFFER_TOO_SMALL;
        }

        //
        //  The only version this code knows about is 1.
        //

        standard->Size = sizeof(BUS_INTERFACE_STANDARD);
        standard->Version = HAL_BUS_INTERFACE_STD_VERSION;
        standard->Context = DeviceObject;

        standard->InterfaceReference = HalPnpInterfaceReference;
        standard->InterfaceDereference = HalPnpInterfaceDereference;
        standard->TranslateBusAddress = HalPnpTranslateBusAddress;
        standard->GetDmaAdapter = HalPnpGetDmaAdapter;
        standard->SetBusData = NULL;
        standard->GetBusData = NULL;

    } else if (IsEqualGUID(&GUID_TRANSLATOR_INTERFACE_STANDARD, InterfaceType)) {

        PTRANSLATOR_INTERFACE translator = (PTRANSLATOR_INTERFACE)Interface;

        //
        // Common initialization.
        //

        if (InterfaceBufferSize < sizeof(TRANSLATOR_INTERFACE)) {
            *Length = sizeof(TRANSLATOR_INTERFACE);
            return STATUS_BUFFER_TOO_SMALL;
        }

        switch ((CM_RESOURCE_TYPE)(INT_PTR)InterfaceSpecificData) {

        case CmResourceTypeInterrupt:

            translator->Size = sizeof(TRANSLATOR_INTERFACE);
            translator->Version = HAL_IRQ_TRANSLATOR_VERSION;
            translator->Context = DeviceObject;
            translator->InterfaceReference = HalTranslatorReference;
            translator->InterfaceDereference = HalTranslatorDereference;
            translator->TranslateResources = HalIrqTranslateResourcesRoot;
            translator->TranslateResourceRequirements =
                HalIrqTranslateResourceRequirementsRoot;
            *Length = sizeof(TRANSLATOR_INTERFACE);

            break;

        default:
            return STATUS_NOT_SUPPORTED;
        }

    } else if (IsEqualGUID(&GUID_ACPI_REGS_INTERFACE_STANDARD, InterfaceType)) {

        //
        // ACPI register function interface.
        //

        PACPI_REGS_INTERFACE_STANDARD AcpiRegInterface =
          (PACPI_REGS_INTERFACE_STANDARD)Interface;

        if (!HalpFakeAcpiRegisters()) {
            return STATUS_NOT_FOUND;
        }

        DbgPrint("Faking ACPI registers\n");

        //
        // Common initialization.
        //
        *Length = sizeof(ACPI_REGS_INTERFACE_STANDARD);

        if (InterfaceBufferSize < sizeof(ACPI_REGS_INTERFACE_STANDARD)) {
            return STATUS_BUFFER_TOO_SMALL;
        }

        AcpiRegInterface->Size = sizeof(ACPI_REGS_INTERFACE_STANDARD);
        AcpiRegInterface->Context = NULL;
        AcpiRegInterface->InterfaceReference = HalTranslatorReference;
        AcpiRegInterface->InterfaceDereference = HalTranslatorDereference;

        //
        // Set the two ACPI register access routines.
        //

        AcpiRegInterface->ReadAcpiRegister = HalpReadAcpiRegister;
        AcpiRegInterface->WriteAcpiRegister = HalpWriteAcpiRegister;

    } else if (IsEqualGUID(&GUID_ACPI_PORT_RANGES_INTERFACE_STANDARD,
                           InterfaceType)) {

        PHAL_PORT_RANGE_INTERFACE PortRanges = (PHAL_PORT_RANGE_INTERFACE)Interface;

        *Length = sizeof(HAL_PORT_RANGE_INTERFACE);

        if (InterfaceBufferSize < sizeof(HAL_PORT_RANGE_INTERFACE)) {
            return STATUS_BUFFER_TOO_SMALL;
        }

        PortRanges->Size = sizeof(HAL_PORT_RANGE_INTERFACE);
        PortRanges->Version = HAL_PORT_RANGE_INTERFACE_VERSION;
        PortRanges->Context = DeviceObject;
        PortRanges->InterfaceReference = HalPnpInterfaceReference;
        PortRanges->InterfaceDereference = HalPnpInterfaceDereference;

        PortRanges->QueryAllocateRange = HalpQueryAllocatePortRange;
        PortRanges->FreeRange = HalpFreePortRange;

    } else {

        //
        //  Unsupport bus interface type.
        //

        return STATUS_NOT_SUPPORTED ;
    }

    //
    // Bump the reference count.
    //

    InterlockedIncrement(&PdoExtension->InterfaceReferenceCount);

    return STATUS_SUCCESS;
}

#ifdef WANT_IRQ_ROUTING

NTSTATUS
HalpQueryInterfaceFdo(
    IN     PDEVICE_OBJECT   DeviceObject,
    IN     LPCGUID          InterfaceType,
    IN     USHORT           Version,
    IN     PVOID            InterfaceSpecificData,
    IN     ULONG            InterfaceBufferSize,
    IN OUT PINTERFACE       Interface,
    IN OUT PULONG           Length
    )

/*++

Routine Description:

    This routine fills in the interface structure for
    a device.

Arguments:

    DeviceObject - FDO of the child

    InterfaceType - Pointer to the interface type GUID.

    Version - Supplies the requested interface version.

    InterfaceSpecificData - This is context that means something based on the
                            interface.

    InterfaceBufferSize - Supplies the length of the buffer for the interface
                          structure.

    Interface - Supplies a pointer where the interface informaiton should
        be returned.

    Length - Supplies the length of the buffer for the interface structure.
        This value is updated on return to actual number of bytes modified.

Return Value:

    status

--*/
{
    NTSTATUS                status = STATUS_NOT_SUPPORTED;
    CM_RESOURCE_TYPE        resource = (CM_RESOURCE_TYPE)InterfaceSpecificData;

    PAGED_CODE();

    if (    resource == CmResourceTypeInterrupt &&
            IsPciIrqRoutingEnabled()) {

        if (IsEqualGUID(&GUID_ARBITER_INTERFACE_STANDARD, InterfaceType)) {

            status = HalpInitIrqArbiter(DeviceObject);

            if (NT_SUCCESS(status))
            {
                status = HalpFillInIrqArbiter(
                    DeviceObject,
                    InterfaceType,
                    Version,
                    InterfaceSpecificData,
                    InterfaceBufferSize,
                    Interface,
                    Length
                    );
            }
        }
        else if (IsEqualGUID(&GUID_TRANSLATOR_INTERFACE_STANDARD, InterfaceType)) {

            PTRANSLATOR_INTERFACE   translator;

            *Length = sizeof(TRANSLATOR_INTERFACE);
            if (InterfaceBufferSize < sizeof(TRANSLATOR_INTERFACE)) {
                return STATUS_BUFFER_TOO_SMALL;
            }

            translator = (PTRANSLATOR_INTERFACE)Interface;

            //
            // Fill in the common bits.
            //

            RtlZeroMemory(translator, sizeof (TRANSLATOR_INTERFACE));
            translator->Size = sizeof(TRANSLATOR_INTERFACE);
            translator->Version = HAL_IRQ_TRANSLATOR_VERSION;
            translator->Context = DeviceObject;
            translator->InterfaceReference = HalTranslatorReference;
            translator->InterfaceDereference = HalTranslatorDereference;

            //
            // Set IRQ translator for PCI interrupts.
            //

            translator->TranslateResources = HalIrqTranslateResourcesRoot;
            translator->TranslateResourceRequirements =
                                            HalIrqTranslateResourceRequirementsRoot;

            status = STATUS_SUCCESS;

            HalDebugPrint(( HAL_PNP, "Providing Irq translator for FDO %p since Pci Irq Routing is enabled!", DeviceObject));
        }
    }

    return (status);
}

#endif

VOID
HalPnpInterfaceReference(
    PVOID Context
    )
/*++

Routine Description:

    This function increments the reference count on the interface context.

Arguments:

    Context - Supplies a pointer to the interface context.  This is actually
        the PDO for the root bus.

Return Value:

    None

--*/
{
    PPDO_EXTENSION  PdoExtension = ((PDEVICE_OBJECT) Context)->DeviceExtension;
    PAGED_CODE();

    ASSERT_PDO_EXTENSION( PdoExtension );

    InterlockedIncrement( &PdoExtension->InterfaceReferenceCount );
}

VOID
HalPnpInterfaceDereference(
    PVOID Context
    )
/*++

Routine Description:

    This function decrements the reference count on the interface context.

Arguments:

    Context - Supplies a pointer to the interface context.  This is actually
        the PDO for the root bus.

Return Value:

    None

--*/
{
    PPDO_EXTENSION  PdoExtension = ((PDEVICE_OBJECT) Context)->DeviceExtension;
    LONG Result;

    PAGED_CODE();

    ASSERT_PDO_EXTENSION( PdoExtension );

    Result = InterlockedDecrement( &PdoExtension->InterfaceReferenceCount );

    ASSERT( Result >= 0 );
}

BOOLEAN
HalPnpTranslateBusAddress(
    IN PVOID Context,
    IN PHYSICAL_ADDRESS BusAddress,
    IN ULONG Length,
    IN OUT PULONG AddressSpace,
    OUT PPHYSICAL_ADDRESS TranslatedAddress
    )
/*++

Routine Description:

    This function is used to translate bus addresses from legacy drivers.  It really
    should never get called on an ACPI system as the PCI or ACPI driver should field
    these requests before it gets here.

Arguments:

    Context - Supplies a pointer to the interface context.  This is actually
        the PDO for the root bus.

    BusAddress - Supplies the orginal address to be translated.

    Length - Supplies the length of the range to be translated.

    AddressSpace - Points to the location of of the address space type such as
        memory or I/O port.  This value is updated by the translation.

    TranslatedAddress - Returns the translated address.

Return Value:

    Returns a boolean indicating if the operations was a success.

--*/
{
    HalDebugPrint(( HAL_PNP, "HAL: HalPnpTranslateBusAddress Called, BusAddress = %p\n", BusAddress ));

    *TranslatedAddress = BusAddress;

    return TRUE;
}

PDMA_ADAPTER
HalPnpGetDmaAdapter(
    IN PVOID Context,
    IN struct _DEVICE_DESCRIPTION *DeviceDescriptor,
    OUT PULONG NumberOfMapRegisters
    )
/*++

Routine Description:

    This function writes the PCI configuration space.

Arguments:

    Context - Supplies a pointer  to the interface context.  This is actually
        the PDO for the root bus.

    DeviceDescriptor - Supplies the device descriptor used to allocate the dma
        adapter object.

    NubmerOfMapRegisters - Returns the maximum number of map registers a device
        can allocate at one time.

Return Value:

    Returns a DMA adapter or NULL.

--*/
{
    PPDO_EXTENSION  PdoExtension = ((PDEVICE_OBJECT) Context)->DeviceExtension;
    PAGED_CODE();

    ASSERT_PDO_EXTENSION( PdoExtension );


    //
    //  Fill in the bus number.
    //

    return (PDMA_ADAPTER) HalGetAdapter( DeviceDescriptor, NumberOfMapRegisters );
}