pci.c

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/*
 * PROJECT:         ReactOS HAL
 * LICENSE:         GPL - See COPYING in the top level directory
 * FILE:            hal/halx86/generic/pci.c
 * PURPOSE:         PCI Bus Support (Configuration Space, Resource Allocation)
 * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
 */

/* INCLUDES ******************************************************************/

#include <hal.h>
#define NDEBUG
#include <debug.h>

/* GLOBALS *******************************************************************/

BOOLEAN HalpPCIConfigInitialized;
ULONG HalpMinPciBus, HalpMaxPciBus;
KSPIN_LOCK HalpPCIConfigLock;
PCI_CONFIG_HANDLER PCIConfigHandler;

/* PCI Operation Matrix */
UCHAR PCIDeref[4][4] =
{
    {0, 1, 2, 2},   // ULONG-aligned offset
    {1, 1, 1, 1},   // UCHAR-aligned offset
    {2, 1, 2, 2},   // USHORT-aligned offset
    {1, 1, 1, 1}    // UCHAR-aligned offset
};

/* Type 1 PCI Bus */
PCI_CONFIG_HANDLER PCIConfigHandlerType1 =
{
    /* Synchronization */
    (FncSync)HalpPCISynchronizeType1,
    (FncReleaseSync)HalpPCIReleaseSynchronzationType1,

    /* Read */
    {
        (FncConfigIO)HalpPCIReadUlongType1,
        (FncConfigIO)HalpPCIReadUcharType1,
        (FncConfigIO)HalpPCIReadUshortType1
    },

    /* Write */
    {
        (FncConfigIO)HalpPCIWriteUlongType1,
        (FncConfigIO)HalpPCIWriteUcharType1,
        (FncConfigIO)HalpPCIWriteUshortType1
    }
};

/* Type 2 PCI Bus */
PCI_CONFIG_HANDLER PCIConfigHandlerType2 =
{
    /* Synchronization */
    (FncSync)HalpPCISynchronizeType2,
    (FncReleaseSync)HalpPCIReleaseSynchronzationType2,

    /* Read */
    {
        (FncConfigIO)HalpPCIReadUlongType2,
        (FncConfigIO)HalpPCIReadUcharType2,
        (FncConfigIO)HalpPCIReadUshortType2
    },

    /* Write */
    {
        (FncConfigIO)HalpPCIWriteUlongType2,
        (FncConfigIO)HalpPCIWriteUcharType2,
        (FncConfigIO)HalpPCIWriteUshortType2
    }
};

PCIPBUSDATA HalpFakePciBusData =
{
    {
        PCI_DATA_TAG,
        PCI_DATA_VERSION,
        HalpReadPCIConfig,
        HalpWritePCIConfig,
        NULL,
        NULL,
        {{{0}}},
        {0, 0, 0, 0}
    },
    {{0}},
    32,
};

BUS_HANDLER HalpFakePciBusHandler =
{
    1,
    PCIBus,
    PCIConfiguration,
    0,
    NULL,
    NULL,
    &HalpFakePciBusData,
    0,
    {0, 0, 0, 0},
    HalpGetPCIData,
    HalpSetPCIData,
    NULL,
    HalpAssignPCISlotResources,
    NULL,
    NULL
};

/* TYPE 1 FUNCTIONS **********************************************************/

VOID
NTAPI
HalpPCISynchronizeType1(IN PBUS_HANDLER BusHandler,
                        IN PCI_SLOT_NUMBER Slot,
                        IN PKIRQL Irql,
                        IN PPCI_TYPE1_CFG_BITS PciCfg1)
{
    /* Setup the PCI Configuration Register */
    PciCfg1->u.AsULONG = 0;
    PciCfg1->u.bits.BusNumber = BusHandler->BusNumber;
    PciCfg1->u.bits.DeviceNumber = Slot.u.bits.DeviceNumber;
    PciCfg1->u.bits.FunctionNumber = Slot.u.bits.FunctionNumber;
    PciCfg1->u.bits.Enable = TRUE;

    /* Acquire the lock */
    KeRaiseIrql(HIGH_LEVEL, Irql);
    KiAcquireSpinLock(&HalpPCIConfigLock);
}

VOID
NTAPI
HalpPCIReleaseSynchronzationType1(IN PBUS_HANDLER BusHandler,
                                  IN KIRQL Irql)
{
    PCI_TYPE1_CFG_BITS PciCfg1;

    /* Clear the PCI Configuration Register */
    PciCfg1.u.AsULONG = 0;
    WRITE_PORT_ULONG(((PPCIPBUSDATA)BusHandler->BusData)->Config.Type1.Address,
                     PciCfg1.u.AsULONG);

    /* Release the lock */
    KiReleaseSpinLock(&HalpPCIConfigLock);
    KeLowerIrql(Irql);
}

TYPE1_READ(HalpPCIReadUcharType1, UCHAR)
TYPE1_READ(HalpPCIReadUshortType1, USHORT)
TYPE1_READ(HalpPCIReadUlongType1, ULONG)
TYPE1_WRITE(HalpPCIWriteUcharType1, UCHAR)
TYPE1_WRITE(HalpPCIWriteUshortType1, USHORT)
TYPE1_WRITE(HalpPCIWriteUlongType1, ULONG)

/* TYPE 2 FUNCTIONS **********************************************************/

VOID
NTAPI
HalpPCISynchronizeType2(IN PBUS_HANDLER BusHandler,
                        IN PCI_SLOT_NUMBER Slot,
                        IN PKIRQL Irql,
                        IN PPCI_TYPE2_ADDRESS_BITS PciCfg)
{
    PCI_TYPE2_CSE_BITS PciCfg2Cse;
    PPCIPBUSDATA BusData = (PPCIPBUSDATA)BusHandler->BusData;

    /* Setup the configuration register */
    PciCfg->u.AsUSHORT = 0;
    PciCfg->u.bits.Agent = (USHORT)Slot.u.bits.DeviceNumber;
    PciCfg->u.bits.AddressBase = (USHORT)BusData->Config.Type2.Base;

    /* Acquire the lock */
    KeRaiseIrql(HIGH_LEVEL, Irql);
    KiAcquireSpinLock(&HalpPCIConfigLock);

    /* Setup the CSE Register */
    PciCfg2Cse.u.AsUCHAR = 0;
    PciCfg2Cse.u.bits.Enable = TRUE;
    PciCfg2Cse.u.bits.FunctionNumber = (UCHAR)Slot.u.bits.FunctionNumber;
    PciCfg2Cse.u.bits.Key = -1;

    /* Write the bus number and CSE */
    WRITE_PORT_UCHAR(BusData->Config.Type2.Forward,
                     (UCHAR)BusHandler->BusNumber);
    WRITE_PORT_UCHAR(BusData->Config.Type2.CSE, PciCfg2Cse.u.AsUCHAR);
}

VOID
NTAPI
HalpPCIReleaseSynchronzationType2(IN PBUS_HANDLER BusHandler,
                                  IN KIRQL Irql)
{
    PCI_TYPE2_CSE_BITS PciCfg2Cse;
    PPCIPBUSDATA BusData = (PPCIPBUSDATA)BusHandler->BusData;

    /* Clear CSE and bus number */
    PciCfg2Cse.u.AsUCHAR = 0;
    WRITE_PORT_UCHAR(BusData->Config.Type2.CSE, PciCfg2Cse.u.AsUCHAR);
    WRITE_PORT_UCHAR(BusData->Config.Type2.Forward, 0);

    /* Release the lock */
    KiReleaseSpinLock(&HalpPCIConfigLock);
    KeLowerIrql(Irql);
}

TYPE2_READ(HalpPCIReadUcharType2, UCHAR)
TYPE2_READ(HalpPCIReadUshortType2, USHORT)
TYPE2_READ(HalpPCIReadUlongType2, ULONG)
TYPE2_WRITE(HalpPCIWriteUcharType2, UCHAR)
TYPE2_WRITE(HalpPCIWriteUshortType2, USHORT)
TYPE2_WRITE(HalpPCIWriteUlongType2, ULONG)

/* PCI CONFIGURATION SPACE ***************************************************/

VOID
NTAPI
HalpPCIConfig(IN PBUS_HANDLER BusHandler,
              IN PCI_SLOT_NUMBER Slot,
              IN PUCHAR Buffer,
              IN ULONG Offset,
              IN ULONG Length,
              IN FncConfigIO *ConfigIO)
{
    KIRQL OldIrql;
    ULONG i;
    UCHAR State[20];

    /* Synchronize the operation */
    PCIConfigHandler.Synchronize(BusHandler, Slot, &OldIrql, State);

    /* Loop every increment */
    while (Length)
    {
        /* Find out the type of read/write we need to do */
        i = PCIDeref[Offset % sizeof(ULONG)][Length % sizeof(ULONG)];

        /* Do the read/write and return the number of bytes */
        i = ConfigIO[i]((PPCIPBUSDATA)BusHandler->BusData,
                        State,
                        Buffer,
                        Offset);

        /* Increment the buffer position and offset, and decrease the length */
        Offset += i;
        Buffer += i;
        Length -= i;
    }

    /* Release the lock and PCI bus */
    PCIConfigHandler.ReleaseSynchronzation(BusHandler, OldIrql);
}

VOID
NTAPI
HalpReadPCIConfig(IN PBUS_HANDLER BusHandler,
                  IN PCI_SLOT_NUMBER Slot,
                  IN PVOID Buffer,
                  IN ULONG Offset,
                  IN ULONG Length)
{
    /* Validate the PCI Slot */
    if (!HalpValidPCISlot(BusHandler, Slot))
    {
        /* Fill the buffer with invalid data */
        RtlFillMemory(Buffer, Length, -1);
    }
    else
    {
        /* Send the request */
        HalpPCIConfig(BusHandler,
                      Slot,
                      Buffer,
                      Offset,
                      Length,
                      PCIConfigHandler.ConfigRead);
    }
}

VOID
NTAPI
HalpWritePCIConfig(IN PBUS_HANDLER BusHandler,
                   IN PCI_SLOT_NUMBER Slot,
                   IN PVOID Buffer,
                   IN ULONG Offset,
                   IN ULONG Length)
{
    /* Validate the PCI Slot */
    if (HalpValidPCISlot(BusHandler, Slot))
    {
        /* Send the request */
        HalpPCIConfig(BusHandler,
                      Slot,
                      Buffer,
                      Offset,
                      Length,
                      PCIConfigHandler.ConfigWrite);
    }
}

BOOLEAN
NTAPI
HalpValidPCISlot(IN PBUS_HANDLER BusHandler,
                 IN PCI_SLOT_NUMBER Slot)
{
    PCI_SLOT_NUMBER MultiSlot;
    PPCIPBUSDATA BusData = (PPCIPBUSDATA)BusHandler->BusData;
    UCHAR HeaderType;
    ULONG Device;

    /* Simple validation */
    if (Slot.u.bits.Reserved) return FALSE;
    if (Slot.u.bits.DeviceNumber >= BusData->MaxDevice) return FALSE;

    /* Function 0 doesn't need checking */
    if (!Slot.u.bits.FunctionNumber) return TRUE;

    /* Functions 0+ need Multi-Function support, so check the slot */
    Device = Slot.u.bits.DeviceNumber;
    MultiSlot = Slot;
    MultiSlot.u.bits.FunctionNumber = 0;

    /* Send function 0 request to get the header back */
    HalpReadPCIConfig(BusHandler,
                      MultiSlot,
                      &HeaderType,
                      FIELD_OFFSET(PCI_COMMON_CONFIG, HeaderType),
                      sizeof(UCHAR));

    /* Now make sure the header is multi-function */
    if (!(HeaderType & PCI_MULTIFUNCTION) || (HeaderType == 0xFF)) return FALSE;
    return TRUE;
}

/* HAL PCI CALLBACKS *********************************************************/

ULONG
NTAPI
HalpGetPCIData(IN PBUS_HANDLER BusHandler,
               IN PBUS_HANDLER RootHandler,
               IN PCI_SLOT_NUMBER Slot,
               IN PUCHAR Buffer,
               IN ULONG Offset,
               IN ULONG Length)
{
    UCHAR PciBuffer[PCI_COMMON_HDR_LENGTH];
    PPCI_COMMON_CONFIG PciConfig = (PPCI_COMMON_CONFIG)PciBuffer;
    ULONG Len = 0;

    /* Normalize the length */
    if (Length > sizeof(PCI_COMMON_CONFIG)) Length = sizeof(PCI_COMMON_CONFIG);

    /* Check if this is a vendor-specific read */
    if (Offset >= PCI_COMMON_HDR_LENGTH)
    {
        /* Read the header */
        HalpReadPCIConfig(BusHandler, Slot, PciConfig, 0, sizeof(ULONG));

        /* Make sure the vendor is valid */
        if (PciConfig->VendorID == PCI_INVALID_VENDORID) return 0;
    }
    else
    {
        /* Read the entire header */
        Len = PCI_COMMON_HDR_LENGTH;
        HalpReadPCIConfig(BusHandler, Slot, PciConfig, 0, Len);

        /* Validate the vendor ID */
        if (PciConfig->VendorID == PCI_INVALID_VENDORID)
        {
            /* It's invalid, but we want to return this much */
            PciConfig->VendorID = PCI_INVALID_VENDORID;
            Len = sizeof(USHORT);
        }

        /* Now check if there's space left */
        if (Len < Offset) return 0;

        /* There is, so return what's after the offset and normalize */
        Len -= Offset;
        if (Len > Length) Len = Length;

        /* Copy the data into the caller's buffer */
        RtlMoveMemory(Buffer, PciBuffer + Offset, Len);

        /* Update buffer and offset, decrement total length */
        Offset += Len;
        Buffer += Len;
        Length -= Len;
    }

    /* Now we still have something to copy */
    if (Length)
    {
        /* Check if it's vendor-specific data */
        if (Offset >= PCI_COMMON_HDR_LENGTH)
        {
            /* Read it now */
            HalpReadPCIConfig(BusHandler, Slot, Buffer, Offset, Length);
            Len += Length;
        }
    }

    /* Update the total length read */
    return Len;
}

ULONG
NTAPI
HalpSetPCIData(IN PBUS_HANDLER BusHandler,
               IN PBUS_HANDLER RootHandler,
               IN PCI_SLOT_NUMBER Slot,
               IN PUCHAR Buffer,
               IN ULONG Offset,
               IN ULONG Length)
{
    UCHAR PciBuffer[PCI_COMMON_HDR_LENGTH];
    PPCI_COMMON_CONFIG PciConfig = (PPCI_COMMON_CONFIG)PciBuffer;
    ULONG Len = 0;

    /* Normalize the length */
    if (Length > sizeof(PCI_COMMON_CONFIG)) Length = sizeof(PCI_COMMON_CONFIG);

    /* Check if this is a vendor-specific read */
    if (Offset >= PCI_COMMON_HDR_LENGTH)
    {
        /* Read the header */
        HalpReadPCIConfig(BusHandler, Slot, PciConfig, 0, sizeof(ULONG));

        /* Make sure the vendor is valid */
        if (PciConfig->VendorID == PCI_INVALID_VENDORID) return 0;
    }
    else
    {
        /* Read the entire header and validate the vendor ID */
        Len = PCI_COMMON_HDR_LENGTH;
        HalpReadPCIConfig(BusHandler, Slot, PciConfig, 0, Len);
        if (PciConfig->VendorID == PCI_INVALID_VENDORID) return 0;

        /* Return what's after the offset and normalize */
        Len -= Offset;
        if (Len > Length) Len = Length;

        /* Copy the specific caller data */
        RtlMoveMemory(PciBuffer + Offset, Buffer, Len);

        /* Write the actual configuration data */
        HalpWritePCIConfig(BusHandler, Slot, PciBuffer + Offset, Offset, Len);

        /* Update buffer and offset, decrement total length */
        Offset += Len;
        Buffer += Len;
        Length -= Len;
    }

    /* Now we still have something to copy */
    if (Length)
    {
        /* Check if it's vendor-specific data */
        if (Offset >= PCI_COMMON_HDR_LENGTH)
        {
            /* Read it now */
            HalpWritePCIConfig(BusHandler, Slot, Buffer, Offset, Length);
            Len += Length;
        }
    }

    /* Update the total length read */
    return Len;
}

NTSTATUS
NTAPI
HalpSetupPciDeviceForDebugging(IN PVOID LoaderBlock,
                               IN OUT PDEBUG_DEVICE_DESCRIPTOR PciDevice)
{
    DPRINT1("Unimplemented!\n");
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS
NTAPI
HalpReleasePciDeviceForDebugging(IN OUT PDEBUG_DEVICE_DESCRIPTOR PciDevice)
{
    DPRINT1("Unimplemented!\n");
    return STATUS_NOT_IMPLEMENTED;
}

NTSTATUS
NTAPI
HalpAssignPCISlotResources(IN PBUS_HANDLER BusHandler,
                           IN PBUS_HANDLER RootHandler,
                           IN PUNICODE_STRING RegistryPath,
                           IN PUNICODE_STRING DriverClassName OPTIONAL,
                           IN PDRIVER_OBJECT DriverObject,
                           IN PDEVICE_OBJECT DeviceObject OPTIONAL,
                           IN ULONG Slot,
                           IN OUT PCM_RESOURCE_LIST *pAllocatedResources)
{
    KeBugCheck(0);
    return STATUS_SUCCESS;
}

ULONG
NTAPI
HaliPciInterfaceReadConfig(IN PBUS_HANDLER RootBusHandler,
                           IN ULONG BusNumber,
                           IN PCI_SLOT_NUMBER SlotNumber,
                           IN PVOID Buffer,
                           IN ULONG Offset,
                           IN ULONG Length)
{
    BUS_HANDLER BusHandler;
    PPCI_COMMON_CONFIG PciData = (PPCI_COMMON_CONFIG)Buffer;

    /* Setup fake PCI Bus handler */
    RtlCopyMemory(&BusHandler, &HalpFakePciBusHandler, sizeof(BUS_HANDLER));
    BusHandler.BusNumber = BusNumber;

    /* Read configuration data */
    HalpReadPCIConfig(&BusHandler, SlotNumber, Buffer, Offset, Length);

    /* Check if caller only wanted at least Vendor ID */
    if (Length >= 2)
    {
        /* Validate it */
        if (PciData->VendorID != PCI_INVALID_VENDORID)
        {
            /* Check if this is the new maximum bus number */
            if (HalpMaxPciBus < BusHandler.BusNumber)
            {
                /* Set it */
                HalpMaxPciBus = BusHandler.BusNumber;
            }
        }
    }

    /* Return length */
    return Length;
}

PPCI_REGISTRY_INFO_INTERNAL
NTAPI
HalpQueryPciRegistryInfo(VOID)
{
    WCHAR NameBuffer[8];
    OBJECT_ATTRIBUTES   ObjectAttributes;
    UNICODE_STRING KeyName, ConfigName, IdentName;
    HANDLE KeyHandle, BusKeyHandle;
    NTSTATUS Status;
    UCHAR KeyBuffer[sizeof(PPCI_REGISTRY_INFO) + 100];
    PKEY_VALUE_FULL_INFORMATION ValueInfo = (PVOID)KeyBuffer;
    ULONG ResultLength;
    PWSTR Tag;
    ULONG i;
    PCM_FULL_RESOURCE_DESCRIPTOR FullDescriptor;
    PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor;
    PPCI_REGISTRY_INFO PciRegInfo;
    PPCI_REGISTRY_INFO_INTERNAL PciRegistryInfo;

    /* Setup the object attributes for the key */
    RtlInitUnicodeString(&KeyName,
                         L"\\Registry\\Machine\\Hardware\\Description\\"
                         L"System\\MultiFunctionAdapter");
    InitializeObjectAttributes(&ObjectAttributes,
                               &KeyName,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);

    /* Open the key */
    Status = ZwOpenKey(&KeyHandle, KEY_READ, &ObjectAttributes);
    if (!NT_SUCCESS(Status)) return NULL;

    /* Setup the receiving string */
    KeyName.Buffer = NameBuffer;
    KeyName.MaximumLength = sizeof(NameBuffer);

    /* Setup the configuration and identifier key names */
    RtlInitUnicodeString(&ConfigName, L"ConfigurationData");
    RtlInitUnicodeString(&IdentName, L"Identifier");

    /* Keep looping for each ID */
    for (i = 0; TRUE; i++)
    {
        /* Setup the key name */
        RtlIntegerToUnicodeString(i, 10, &KeyName);
        InitializeObjectAttributes(&ObjectAttributes,
                                   &KeyName,
                                   OBJ_CASE_INSENSITIVE,
                                   KeyHandle,
                                   NULL);

        /* Open it */
        Status = ZwOpenKey(&BusKeyHandle, KEY_READ, &ObjectAttributes);
        if (!NT_SUCCESS(Status))
        {
            /* None left, fail */
            ZwClose(KeyHandle);
            return NULL;
        }

        /* Read the registry data */
        Status = ZwQueryValueKey(BusKeyHandle,
                                 &IdentName,
                                 KeyValueFullInformation,
                                 ValueInfo,
                                 sizeof(KeyBuffer),
                                 &ResultLength);
        if (!NT_SUCCESS(Status))
        {
            /* Failed, try the next one */
            ZwClose(BusKeyHandle);
            continue;
        }

        /* Get the PCI Tag and validate it */
        Tag = (PWSTR)((ULONG_PTR)ValueInfo + ValueInfo->DataOffset);
        if ((Tag[0] != L'P') ||
            (Tag[1] != L'C') ||
            (Tag[2] != L'I') ||
            (Tag[3]))
        {
            /* Not a valid PCI entry, skip it */
            ZwClose(BusKeyHandle);
            continue;
        }

        /* Now read our PCI structure */
        Status = ZwQueryValueKey(BusKeyHandle,
                                 &ConfigName,
                                 KeyValueFullInformation,
                                 ValueInfo,
                                 sizeof(KeyBuffer),
                                 &ResultLength);
        ZwClose(BusKeyHandle);
        if (!NT_SUCCESS(Status)) continue;

        /* We read it OK! Get the actual resource descriptors */
        FullDescriptor  = (PCM_FULL_RESOURCE_DESCRIPTOR)
                          ((ULONG_PTR)ValueInfo + ValueInfo->DataOffset);
        PartialDescriptor = (PCM_PARTIAL_RESOURCE_DESCRIPTOR)
                            ((ULONG_PTR)FullDescriptor->
                                        PartialResourceList.PartialDescriptors);

        /* Check if this is our PCI Registry Information */
        if (PartialDescriptor->Type == CmResourceTypeDeviceSpecific)
        {
            /* Close the key */
            ZwClose(KeyHandle);

            /* FIXME: Check PnP\PCI\CardList */

            /* Get the PCI information */
            PciRegInfo = (PPCI_REGISTRY_INFO)(PartialDescriptor + 1);

            /* Allocate the return structure */
            PciRegistryInfo = ExAllocatePoolWithTag(NonPagedPool,
                                                    sizeof(PCI_REGISTRY_INFO_INTERNAL),
                                                    ' laH');
            if (!PciRegistryInfo) return NULL;

            /* Fill it out */
            PciRegistryInfo->HardwareMechanism = PciRegInfo->HardwareMechanism;
            PciRegistryInfo->NoBuses = PciRegInfo->NoBuses;
            PciRegistryInfo->MajorRevision = PciRegInfo->MajorRevision;
            PciRegistryInfo->MinorRevision = PciRegInfo->MinorRevision;
            PciRegistryInfo->ElementCount = 0;
        }
    }
}

VOID
NTAPI
HalpInitializePciStubs(VOID)
{
    PPCI_REGISTRY_INFO_INTERNAL PciRegistryInfo;
    UCHAR PciType;
    PPCIPBUSDATA BusData = (PPCIPBUSDATA)HalpFakePciBusHandler.BusData;
    ULONG i;
    PCI_SLOT_NUMBER j;
    ULONG VendorId = 0;

    /* Query registry information */
    PciRegistryInfo = HalpQueryPciRegistryInfo();
    if (!PciRegistryInfo)
    {
        /* Assume type 1 */
        PciType = 1;
    }
    else
    {
        /* Get the type and free the info structure */
        PciType = PciRegistryInfo->HardwareMechanism & 0xF;
        ExFreePool(PciRegistryInfo);
    }

    /* Initialize the PCI lock */
    KeInitializeSpinLock(&HalpPCIConfigLock);

    /* Check the type of PCI bus */
    switch (PciType)
    {
        /* Type 1 PCI Bus */
        case 1:

            /* Copy the Type 1 handler data */
            RtlCopyMemory(&PCIConfigHandler,
                          &PCIConfigHandlerType1,
                          sizeof(PCIConfigHandler));

            /* Set correct I/O Ports */
            BusData->Config.Type1.Address = PCI_TYPE1_ADDRESS_PORT;
            BusData->Config.Type1.Data = PCI_TYPE1_DATA_PORT;
            break;

        /* Type 2 PCI Bus */
        case 2:

            /* Copy the Type 1 handler data */
            RtlCopyMemory(&PCIConfigHandler,
                          &PCIConfigHandlerType2,
                          sizeof (PCIConfigHandler));

            /* Set correct I/O Ports */
            BusData->Config.Type2.CSE = PCI_TYPE2_CSE_PORT;
            BusData->Config.Type2.Forward = PCI_TYPE2_FORWARD_PORT;
            BusData->Config.Type2.Base = PCI_TYPE2_ADDRESS_BASE;

            /* Only 16 devices supported, not 32 */
            BusData->MaxDevice = 16;
            break;

        default:

            /* Invalid type */
            DbgPrint("HAL: Unnkown PCI type\n");
    }

    /* Loop all possible buses */
    for (i = 0; i < 256; i++)
    {
        /* Loop all devices */
        for (j.u.AsULONG = 0; j.u.AsULONG < 32; j.u.AsULONG++)
        {
            /* Query the interface */
            if (HaliPciInterfaceReadConfig(NULL,
                                           i,
                                           j,
                                           &VendorId,
                                           0,
                                           sizeof(ULONG)))
            {
                /* Validate the vendor ID */
                if ((USHORT)VendorId != PCI_INVALID_VENDORID)
                {
                    /* Set this as the maximum ID */
                    HalpMaxPciBus = i;
                    break;
                }
            }
        }
    }

    /* We're done */
    HalpPCIConfigInitialized = TRUE;
}

VOID
NTAPI
HalpInitializePciBus(VOID)
{
    /* Initialize the stubs */
    HalpInitializePciStubs();

    /* FIXME: Initialize NMI Crash Flag */
}

/* EOF */