pnpmgr.c

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/*
 * PROJECT:         ReactOS Kernel
 * COPYRIGHT:       GPL - See COPYING in the top level directory
 * FILE:            ntoskrnl/io/pnpmgr/pnpmgr.c
 * PURPOSE:         Initializes the PnP manager
 * PROGRAMMERS:     Casper S. Hornstrup (chorns@users.sourceforge.net)
 *                  Copyright 2007 Hervé Poussineau (hpoussin@reactos.org)
 */

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

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

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

ERESOURCE PpRegistryDeviceResource;
KGUARDED_MUTEX PpDeviceReferenceTableLock;
RTL_AVL_TABLE PpDeviceReferenceTable;

extern ULONG ExpInitializationPhase;

/* DATA **********************************************************************/

PDRIVER_OBJECT IopRootDriverObject;
PIO_BUS_TYPE_GUID_LIST PnpBusTypeGuidList = NULL;

/* FUNCTIONS *****************************************************************/

VOID
IopFixupDeviceId(PWCHAR String)
{
    SIZE_T Length = wcslen(String), i;

    for (i = 0; i < Length; i++)
    {
        if (String[i] == L'\\')
            String[i] = L'#';
    }
}

VOID
NTAPI
IopInstallCriticalDevice(PDEVICE_NODE DeviceNode)
{
    NTSTATUS Status;
    HANDLE CriticalDeviceKey, InstanceKey;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING CriticalDeviceKeyU = RTL_CONSTANT_STRING(L"\\Registry\\Machine\\System\\CurrentControlSet\\Control\\CriticalDeviceDatabase");
    UNICODE_STRING CompatibleIdU = RTL_CONSTANT_STRING(L"CompatibleIDs");
    UNICODE_STRING HardwareIdU = RTL_CONSTANT_STRING(L"HardwareID");
    UNICODE_STRING ServiceU = RTL_CONSTANT_STRING(L"Service");
    UNICODE_STRING ClassGuidU = RTL_CONSTANT_STRING(L"ClassGUID");
    PKEY_VALUE_PARTIAL_INFORMATION PartialInfo;
    ULONG HidLength = 0, CidLength = 0, BufferLength;
    PWCHAR IdBuffer, OriginalIdBuffer;

    /* Open the device instance key */
    Status = IopCreateDeviceKeyPath(&DeviceNode->InstancePath, REG_OPTION_NON_VOLATILE, &InstanceKey);
    if (Status != STATUS_SUCCESS)
        return;

    Status = ZwQueryValueKey(InstanceKey,
                             &HardwareIdU,
                             KeyValuePartialInformation,
                             NULL,
                             0,
                             &HidLength);
    if (Status != STATUS_BUFFER_OVERFLOW && Status != STATUS_BUFFER_TOO_SMALL)
    {
        ZwClose(InstanceKey);
        return;
    }

    Status = ZwQueryValueKey(InstanceKey,
                             &CompatibleIdU,
                             KeyValuePartialInformation,
                             NULL,
                             0,
                             &CidLength);
    if (Status != STATUS_BUFFER_OVERFLOW && Status != STATUS_BUFFER_TOO_SMALL)
    {
        CidLength = 0;
    }

    BufferLength = HidLength + CidLength;
    BufferLength -= (((CidLength != 0) ? 2 : 1) * FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data));

    /* Allocate a buffer to hold data from both */
    OriginalIdBuffer = IdBuffer = ExAllocatePool(PagedPool, BufferLength);
    if (!IdBuffer)
    {
        ZwClose(InstanceKey);
        return;
    }

    /* Compute the buffer size */
    if (HidLength > CidLength)
        BufferLength = HidLength;
    else
        BufferLength = CidLength;

    PartialInfo = ExAllocatePool(PagedPool, BufferLength);
    if (!PartialInfo)
    {
        ZwClose(InstanceKey);
        ExFreePool(OriginalIdBuffer);
        return;
    }

    Status = ZwQueryValueKey(InstanceKey,
                             &HardwareIdU,
                             KeyValuePartialInformation,
                             PartialInfo,
                             HidLength,
                             &HidLength);
    if (Status != STATUS_SUCCESS)
    {
        ExFreePool(PartialInfo);
        ExFreePool(OriginalIdBuffer);
        ZwClose(InstanceKey);
        return;
    }

    /* Copy in HID info first (without 2nd terminating NULL if CID is present) */
    HidLength = PartialInfo->DataLength - ((CidLength != 0) ? sizeof(WCHAR) : 0);
    RtlCopyMemory(IdBuffer, PartialInfo->Data, HidLength);

    if (CidLength != 0)
    {
        Status = ZwQueryValueKey(InstanceKey,
                                 &CompatibleIdU,
                                 KeyValuePartialInformation,
                                 PartialInfo,
                                 CidLength,
                                 &CidLength);
        if (Status != STATUS_SUCCESS)
        {
            ExFreePool(PartialInfo);
            ExFreePool(OriginalIdBuffer);
            ZwClose(InstanceKey);
            return;
        }

        /* Copy CID next */
        CidLength = PartialInfo->DataLength;
        RtlCopyMemory(((PUCHAR)IdBuffer) + HidLength, PartialInfo->Data, CidLength);
    }

    /* Free our temp buffer */
    ExFreePool(PartialInfo);

    InitializeObjectAttributes(&ObjectAttributes,
                               &CriticalDeviceKeyU,
                               OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
    Status = ZwOpenKey(&CriticalDeviceKey,
                       KEY_ENUMERATE_SUB_KEYS,
                       &ObjectAttributes);
    if (!NT_SUCCESS(Status))
    {
        /* The critical device database doesn't exist because
         * we're probably in 1st stage setup, but it's ok */
        ExFreePool(OriginalIdBuffer);
        ZwClose(InstanceKey);
        return;
    }

    while (*IdBuffer)
    {
        USHORT StringLength = (USHORT)wcslen(IdBuffer) + 1, Index;

        IopFixupDeviceId(IdBuffer);

        /* Look through all subkeys for a match */
        for (Index = 0; TRUE; Index++)
        {
            ULONG NeededLength;
            PKEY_BASIC_INFORMATION BasicInfo;

            Status = ZwEnumerateKey(CriticalDeviceKey,
                                    Index,
                                    KeyBasicInformation,
                                    NULL,
                                    0,
                                    &NeededLength);
            if (Status == STATUS_NO_MORE_ENTRIES)
                break;
            else if (Status == STATUS_BUFFER_OVERFLOW || Status == STATUS_BUFFER_TOO_SMALL)
            {
                UNICODE_STRING ChildIdNameU, RegKeyNameU;

                BasicInfo = ExAllocatePool(PagedPool, NeededLength);
                if (!BasicInfo)
                {
                    /* No memory */
                    ExFreePool(OriginalIdBuffer);
                    ZwClose(CriticalDeviceKey);
                    ZwClose(InstanceKey);
                    return;
                }

                Status = ZwEnumerateKey(CriticalDeviceKey,
                                        Index,
                                        KeyBasicInformation,
                                        BasicInfo,
                                        NeededLength,
                                        &NeededLength);
                if (Status != STATUS_SUCCESS)
                {
                    /* This shouldn't happen */
                    ExFreePool(BasicInfo);
                    continue;
                }

                ChildIdNameU.Buffer = IdBuffer;
                ChildIdNameU.MaximumLength = ChildIdNameU.Length = (StringLength - 1) * sizeof(WCHAR);
                RegKeyNameU.Buffer = BasicInfo->Name;
                RegKeyNameU.MaximumLength = RegKeyNameU.Length = (USHORT)BasicInfo->NameLength;

                if (RtlEqualUnicodeString(&ChildIdNameU, &RegKeyNameU, TRUE))
                {
                    HANDLE ChildKeyHandle;

                    InitializeObjectAttributes(&ObjectAttributes,
                                               &ChildIdNameU,
                                               OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE,
                                               CriticalDeviceKey,
                                               NULL);

                    Status = ZwOpenKey(&ChildKeyHandle,
                                       KEY_QUERY_VALUE,
                                       &ObjectAttributes);
                    if (Status != STATUS_SUCCESS)
                    {
                        ExFreePool(BasicInfo);
                        continue;
                    }

                    /* Check if there's already a driver installed */
                    Status = ZwQueryValueKey(InstanceKey,
                                             &ClassGuidU,
                                             KeyValuePartialInformation,
                                             NULL,
                                             0,
                                             &NeededLength);
                    if (Status == STATUS_BUFFER_OVERFLOW || Status == STATUS_BUFFER_TOO_SMALL)
                    {
                        ExFreePool(BasicInfo);
                        continue;
                    }

                    Status = ZwQueryValueKey(ChildKeyHandle,
                                             &ClassGuidU,
                                             KeyValuePartialInformation,
                                             NULL,
                                             0,
                                             &NeededLength);
                    if (Status != STATUS_BUFFER_OVERFLOW && Status != STATUS_BUFFER_TOO_SMALL)
                    {
                        ExFreePool(BasicInfo);
                        continue;
                    }

                    PartialInfo = ExAllocatePool(PagedPool, NeededLength);
                    if (!PartialInfo)
                    {
                        ExFreePool(OriginalIdBuffer);
                        ExFreePool(BasicInfo);
                        ZwClose(InstanceKey);
                        ZwClose(ChildKeyHandle);
                        ZwClose(CriticalDeviceKey);
                        return;
                    }

                    /* Read ClassGUID entry in the CDDB */
                    Status = ZwQueryValueKey(ChildKeyHandle,
                                             &ClassGuidU,
                                             KeyValuePartialInformation,
                                             PartialInfo,
                                             NeededLength,
                                             &NeededLength);
                    if (Status != STATUS_SUCCESS)
                    {
                        ExFreePool(BasicInfo);
                        continue;
                    }

                    /* Write it to the ENUM key */
                    Status = ZwSetValueKey(InstanceKey,
                                           &ClassGuidU,
                                           0,
                                           REG_SZ,
                                           PartialInfo->Data,
                                           PartialInfo->DataLength);
                    if (Status != STATUS_SUCCESS)
                    {
                        ExFreePool(BasicInfo);
                        ExFreePool(PartialInfo);
                        ZwClose(ChildKeyHandle);
                        continue;
                    }

                    Status = ZwQueryValueKey(ChildKeyHandle,
                                             &ServiceU,
                                             KeyValuePartialInformation,
                                             NULL,
                                             0,
                                             &NeededLength);
                    if (Status == STATUS_BUFFER_OVERFLOW || Status == STATUS_BUFFER_TOO_SMALL)
                    {
                        ExFreePool(PartialInfo);
                        PartialInfo = ExAllocatePool(PagedPool, NeededLength);
                        if (!PartialInfo)
                        {
                            ExFreePool(OriginalIdBuffer);
                            ExFreePool(BasicInfo);
                            ZwClose(InstanceKey);
                            ZwClose(ChildKeyHandle);
                            ZwClose(CriticalDeviceKey);
                            return;
                        }

                        /* Read the service entry from the CDDB */
                        Status = ZwQueryValueKey(ChildKeyHandle,
                                                 &ServiceU,
                                                 KeyValuePartialInformation,
                                                 PartialInfo,
                                                 NeededLength,
                                                 &NeededLength);
                        if (Status != STATUS_SUCCESS)
                        {
                            ExFreePool(BasicInfo);
                            ExFreePool(PartialInfo);
                            ZwClose(ChildKeyHandle);
                            continue;
                        }

                        /* Write it to the ENUM key */
                        Status = ZwSetValueKey(InstanceKey,
                                               &ServiceU,
                                               0,
                                               REG_SZ,
                                               PartialInfo->Data,
                                               PartialInfo->DataLength);
                        if (Status != STATUS_SUCCESS)
                        {
                            ExFreePool(BasicInfo);
                            ExFreePool(PartialInfo);
                            ZwClose(ChildKeyHandle);
                            continue;
                        }

                        DPRINT("Installed service '%S' for critical device '%wZ'\n", PartialInfo->Data, &ChildIdNameU);
                    }
                    else
                    {
                        DPRINT1("Installed NULL service for critical device '%wZ'\n", &ChildIdNameU);
                    }

                    ExFreePool(OriginalIdBuffer);
                    ExFreePool(PartialInfo);
                    ExFreePool(BasicInfo);
                    ZwClose(InstanceKey);
                    ZwClose(ChildKeyHandle);
                    ZwClose(CriticalDeviceKey);

                    /* That's it */
                    return;
                }

                ExFreePool(BasicInfo);
            }
            else
            {
                /* Umm, not sure what happened here */
                continue;
            }
        }

        /* Advance to the next ID */
        IdBuffer += StringLength;
    }

    ExFreePool(OriginalIdBuffer);
    ZwClose(InstanceKey);
    ZwClose(CriticalDeviceKey);
}

NTSTATUS
IopGetSystemPowerDeviceObject(PDEVICE_OBJECT *DeviceObject)
{
    KIRQL OldIrql;

    if (PopSystemPowerDeviceNode)
    {
        KeAcquireSpinLock(&IopDeviceTreeLock, &OldIrql);
        *DeviceObject = PopSystemPowerDeviceNode->PhysicalDeviceObject;
        KeReleaseSpinLock(&IopDeviceTreeLock, OldIrql);

        return STATUS_SUCCESS;
    }

    return STATUS_UNSUCCESSFUL;
}

USHORT
NTAPI
IopGetBusTypeGuidIndex(LPGUID BusTypeGuid)
{
    USHORT i = 0, FoundIndex = 0xFFFF;
    ULONG NewSize;
    PVOID NewList;

    /* Acquire the lock */
    ExAcquireFastMutex(&PnpBusTypeGuidList->Lock);

    /* Loop all entries */
    while (i < PnpBusTypeGuidList->GuidCount)
    {
         /* Try to find a match */
         if (RtlCompareMemory(BusTypeGuid,
                              &PnpBusTypeGuidList->Guids[i],
                              sizeof(GUID)) == sizeof(GUID))
         {
              /* Found it */
              FoundIndex = i;
              goto Quickie;
         }
         i++;
    }

    /* Check if we have to grow the list */
    if (PnpBusTypeGuidList->GuidCount)
    {
        /* Calculate the new size */
        NewSize = sizeof(IO_BUS_TYPE_GUID_LIST) +
                 (sizeof(GUID) * PnpBusTypeGuidList->GuidCount);

        /* Allocate the new copy */
        NewList = ExAllocatePool(PagedPool, NewSize);

        if (!NewList)
        {
            /* Fail */
            ExFreePool(PnpBusTypeGuidList);
            goto Quickie;
        }

        /* Now copy them, decrease the size too */
        NewSize -= sizeof(GUID);
        RtlCopyMemory(NewList, PnpBusTypeGuidList, NewSize);

        /* Free the old list */
        ExFreePool(PnpBusTypeGuidList);

        /* Use the new buffer */
        PnpBusTypeGuidList = NewList;
    }

    /* Copy the new GUID */
    RtlCopyMemory(&PnpBusTypeGuidList->Guids[PnpBusTypeGuidList->GuidCount],
                  BusTypeGuid,
                  sizeof(GUID));

    /* The new entry is the index */
    FoundIndex = (USHORT)PnpBusTypeGuidList->GuidCount;
    PnpBusTypeGuidList->GuidCount++;

Quickie:
    ExReleaseFastMutex(&PnpBusTypeGuidList->Lock);
    return FoundIndex;
}

NTSTATUS
NTAPI
IopInitiatePnpIrp(IN PDEVICE_OBJECT DeviceObject,
                  IN OUT PIO_STATUS_BLOCK IoStatusBlock,
                  IN UCHAR MinorFunction,
                  IN PIO_STACK_LOCATION Stack OPTIONAL)
{
    IO_STACK_LOCATION IoStackLocation;

    /* Fill out the stack information */
    RtlZeroMemory(&IoStackLocation, sizeof(IO_STACK_LOCATION));
    IoStackLocation.MajorFunction = IRP_MJ_PNP;
    IoStackLocation.MinorFunction = MinorFunction;
    if (Stack)
    {
        /* Copy the rest */
        RtlCopyMemory(&IoStackLocation.Parameters,
                      &Stack->Parameters,
                      sizeof(Stack->Parameters));
    }

    /* Do the PnP call */
    IoStatusBlock->Status = IopSynchronousCall(DeviceObject,
                                               &IoStackLocation,
                                               (PVOID)&IoStatusBlock->Information);
    return IoStatusBlock->Status;
}

/*
 * IopCreateDeviceKeyPath
 *
 * Creates a registry key
 *
 * Parameters
 *    RegistryPath
 *        Name of the key to be created.
 *    Handle
 *        Handle to the newly created key
 *
 * Remarks
 *     This method can create nested trees, so parent of RegistryPath can
 *     be not existant, and will be created if needed.
 */
NTSTATUS
NTAPI
IopCreateDeviceKeyPath(IN PCUNICODE_STRING RegistryPath,
                       IN ULONG CreateOptions,
                       OUT PHANDLE Handle)
{
    UNICODE_STRING EnumU = RTL_CONSTANT_STRING(ENUM_ROOT);
    HANDLE hParent = NULL, hKey;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING KeyName;
    PCWSTR Current, Last;
    USHORT Length;
    NTSTATUS Status;

    /* Assume failure */
    *Handle = NULL;

    /* Open root key for device instances */
    Status = IopOpenRegistryKeyEx(&hParent, NULL, &EnumU, KEY_CREATE_SUB_KEY);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("ZwOpenKey('%wZ') failed with status 0x%08lx\n", &EnumU, Status);
        return Status;
    }

    Current = KeyName.Buffer = RegistryPath->Buffer;
    Last = &RegistryPath->Buffer[RegistryPath->Length / sizeof(WCHAR)];

    /* Go up to the end of the string */
    while (Current <= Last)
    {
        if (Current != Last && *Current != L'\\')
        {
            /* Not the end of the string and not a separator */
            Current++;
            continue;
        }

        /* Prepare relative key name */
        Length = (USHORT)((ULONG_PTR)Current - (ULONG_PTR)KeyName.Buffer);
        KeyName.MaximumLength = KeyName.Length = Length;
        DPRINT("Create '%wZ'\n", &KeyName);

        /* Open key */
        InitializeObjectAttributes(&ObjectAttributes,
                                   &KeyName,
                                   OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                                   hParent,
                                   NULL);
        Status = ZwCreateKey(&hKey,
                             Current == Last ? KEY_ALL_ACCESS : KEY_CREATE_SUB_KEY,
                             &ObjectAttributes,
                             0,
                             NULL,
                             CreateOptions,
                             NULL);

        /* Close parent key handle, we don't need it anymore */
        if (hParent)
            ZwClose(hParent);

        /* Key opening/creating failed? */
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("ZwCreateKey('%wZ') failed with status 0x%08lx\n", &KeyName, Status);
            return Status;
        }

        /* Check if it is the end of the string */
        if (Current == Last)
        {
            /* Yes, return success */
            *Handle = hKey;
            return STATUS_SUCCESS;
        }

        /* Start with this new parent key */
        hParent = hKey;
        Current++;
        KeyName.Buffer = (PWSTR)Current;
    }

    return STATUS_UNSUCCESSFUL;
}

NTSTATUS
IopSetDeviceInstanceData(HANDLE InstanceKey,
                         PDEVICE_NODE DeviceNode)
{
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING KeyName;
    HANDLE LogConfKey, ControlKey, DeviceParamsKey;
    ULONG ResCount;
    ULONG ResultLength;
    NTSTATUS Status;

    DPRINT("IopSetDeviceInstanceData() called\n");

    /* Create the 'LogConf' key */
    RtlInitUnicodeString(&KeyName, L"LogConf");
    InitializeObjectAttributes(&ObjectAttributes,
                               &KeyName,
                               OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                               InstanceKey,
                               NULL);
    Status = ZwCreateKey(&LogConfKey,
                         KEY_ALL_ACCESS,
                         &ObjectAttributes,
                         0,
                         NULL,
                         // FIXME? In r53694 it was silently turned from non-volatile into this,
                         // without any extra warning. Is this still needed??
                         REG_OPTION_VOLATILE,
                         NULL);
    if (NT_SUCCESS(Status))
    {
        /* Set 'BootConfig' value */
        if (DeviceNode->BootResources != NULL)
        {
            ResCount = DeviceNode->BootResources->Count;
            if (ResCount != 0)
            {
                RtlInitUnicodeString(&KeyName, L"BootConfig");
                Status = ZwSetValueKey(LogConfKey,
                                       &KeyName,
                                       0,
                                       REG_RESOURCE_LIST,
                                       DeviceNode->BootResources,
                                       PnpDetermineResourceListSize(DeviceNode->BootResources));
            }
        }

        /* Set 'BasicConfigVector' value */
        if (DeviceNode->ResourceRequirements != NULL &&
            DeviceNode->ResourceRequirements->ListSize != 0)
        {
            RtlInitUnicodeString(&KeyName, L"BasicConfigVector");
            Status = ZwSetValueKey(LogConfKey,
                                   &KeyName,
                                   0,
                                   REG_RESOURCE_REQUIREMENTS_LIST,
                                   DeviceNode->ResourceRequirements,
                                   DeviceNode->ResourceRequirements->ListSize);
        }

        ZwClose(LogConfKey);
    }

    /* Set the 'ConfigFlags' value */
    RtlInitUnicodeString(&KeyName, L"ConfigFlags");
    Status = ZwQueryValueKey(InstanceKey,
                             &KeyName,
                             KeyValueBasicInformation,
                             NULL,
                             0,
                             &ResultLength);
    if (Status == STATUS_OBJECT_NAME_NOT_FOUND)
    {
        /* Write the default value */
        ULONG DefaultConfigFlags = 0;
        Status = ZwSetValueKey(InstanceKey,
                               &KeyName,
                               0,
                               REG_DWORD,
                               &DefaultConfigFlags,
                               sizeof(DefaultConfigFlags));
    }

    /* Create the 'Control' key */
    RtlInitUnicodeString(&KeyName, L"Control");
    InitializeObjectAttributes(&ObjectAttributes,
                               &KeyName,
                               OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                               InstanceKey,
                               NULL);
    Status = ZwCreateKey(&ControlKey,
                         0,
                         &ObjectAttributes,
                         0,
                         NULL,
                         REG_OPTION_VOLATILE,
                         NULL);
    if (NT_SUCCESS(Status))
        ZwClose(ControlKey);

    /* Create the 'Device Parameters' key and set the 'FirmwareIdentified' value for all ACPI-enumerated devices */
    if (_wcsnicmp(DeviceNode->InstancePath.Buffer, L"ACPI\\", 5) == 0)
    {
        RtlInitUnicodeString(&KeyName, L"Device Parameters");
        InitializeObjectAttributes(&ObjectAttributes,
                                   &KeyName,
                                   OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                                   InstanceKey,
                                   NULL);
        Status = ZwCreateKey(&DeviceParamsKey,
                             0,
                             &ObjectAttributes,
                             0,
                             NULL,
                             REG_OPTION_NON_VOLATILE,
                             NULL);
        if (NT_SUCCESS(Status))
        {
            ULONG FirmwareIdentified = 1;
            RtlInitUnicodeString(&KeyName, L"FirmwareIdentified");
            Status = ZwSetValueKey(DeviceParamsKey,
                                   &KeyName,
                                   0,
                                   REG_DWORD,
                                   &FirmwareIdentified,
                                   sizeof(FirmwareIdentified));

            ZwClose(DeviceParamsKey);
        }
    }

    DPRINT("IopSetDeviceInstanceData() done\n");

    return Status;
}

/*
 * IopGetParentIdPrefix
 *
 * Retrieve (or create) a string which identifies a device.
 *
 * Parameters
 *    DeviceNode
 *        Pointer to device node.
 *    ParentIdPrefix
 *        Pointer to the string where is returned the parent node identifier
 *
 * Remarks
 *     If the return code is STATUS_SUCCESS, the ParentIdPrefix string is
 *     valid and its Buffer field is NULL-terminated. The caller needs to
 *     to free the string with RtlFreeUnicodeString when it is no longer
 *     needed.
 */

NTSTATUS
IopGetParentIdPrefix(PDEVICE_NODE DeviceNode,
                     PUNICODE_STRING ParentIdPrefix)
{
    const UNICODE_STRING EnumKeyPath = RTL_CONSTANT_STRING(L"\\Registry\\Machine\\System\\CurrentControlSet\\Enum\\");
    ULONG KeyNameBufferLength;
    PKEY_VALUE_PARTIAL_INFORMATION ParentIdPrefixInformation = NULL;
    UNICODE_STRING KeyName = {0, 0, NULL};
    UNICODE_STRING KeyValue;
    UNICODE_STRING ValueName;
    HANDLE hKey = NULL;
    ULONG crc32;
    NTSTATUS Status;

    /* HACK: As long as some devices have a NULL device
     * instance path, the following test is required :(
     */
    if (DeviceNode->Parent->InstancePath.Length == 0)
    {
        DPRINT1("Parent of %wZ has NULL Instance path, please report!\n",
                &DeviceNode->InstancePath);
        return STATUS_UNSUCCESSFUL;
    }

    /* 1. Try to retrieve ParentIdPrefix from registry */
    KeyNameBufferLength = FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data) + sizeof(L"12345678&12345678");
    ParentIdPrefixInformation = ExAllocatePoolWithTag(PagedPool,
                                                      KeyNameBufferLength + sizeof(UNICODE_NULL),
                                                      TAG_IO);
    if (!ParentIdPrefixInformation)
    {
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    KeyName.Length = 0;
    KeyName.MaximumLength = EnumKeyPath.Length +
                            DeviceNode->Parent->InstancePath.Length +
                            sizeof(UNICODE_NULL);
    KeyName.Buffer = ExAllocatePoolWithTag(PagedPool,
                                           KeyName.MaximumLength,
                                           TAG_IO);
    if (!KeyName.Buffer)
    {
        Status = STATUS_INSUFFICIENT_RESOURCES;
        goto cleanup;
    }

    RtlCopyUnicodeString(&KeyName, &EnumKeyPath);
    RtlAppendUnicodeStringToString(&KeyName, &DeviceNode->Parent->InstancePath);

    Status = IopOpenRegistryKeyEx(&hKey, NULL, &KeyName, KEY_QUERY_VALUE | KEY_SET_VALUE);
    if (!NT_SUCCESS(Status))
    {
        goto cleanup;
    }
    RtlInitUnicodeString(&ValueName, L"ParentIdPrefix");
    Status = ZwQueryValueKey(hKey,
                             &ValueName,
                             KeyValuePartialInformation,
                             ParentIdPrefixInformation,
                             KeyNameBufferLength,
                             &KeyNameBufferLength);
    if (NT_SUCCESS(Status))
    {
        if (ParentIdPrefixInformation->Type != REG_SZ)
        {
            Status = STATUS_UNSUCCESSFUL;
        }
        else
        {
            KeyValue.MaximumLength = (USHORT)ParentIdPrefixInformation->DataLength;
            KeyValue.Length = KeyValue.MaximumLength - sizeof(UNICODE_NULL);
            KeyValue.Buffer = (PWSTR)ParentIdPrefixInformation->Data;
            ASSERT(KeyValue.Buffer[KeyValue.Length / sizeof(WCHAR)] == UNICODE_NULL);
        }
        goto cleanup;
    }
    if (Status != STATUS_OBJECT_NAME_NOT_FOUND)
    {
        /* FIXME how do we get here and why is ParentIdPrefixInformation valid? */
        KeyValue.MaximumLength = (USHORT)ParentIdPrefixInformation->DataLength;
        KeyValue.Length = KeyValue.MaximumLength - sizeof(UNICODE_NULL);
        KeyValue.Buffer = (PWSTR)ParentIdPrefixInformation->Data;
        ASSERT(KeyValue.Buffer[KeyValue.Length / sizeof(WCHAR)] == UNICODE_NULL);
        goto cleanup;
    }

    /* 2. Create the ParentIdPrefix value */
    crc32 = RtlComputeCrc32(0,
                            (PUCHAR)DeviceNode->Parent->InstancePath.Buffer,
                            DeviceNode->Parent->InstancePath.Length);

    RtlStringCbPrintfW((PWSTR)ParentIdPrefixInformation,
                       KeyNameBufferLength,
                       L"%lx&%lx",
                       DeviceNode->Parent->Level,
                       crc32);
    RtlInitUnicodeString(&KeyValue, (PWSTR)ParentIdPrefixInformation);

    /* 3. Try to write the ParentIdPrefix to registry */
    Status = ZwSetValueKey(hKey,
                           &ValueName,
                           0,
                           REG_SZ,
                           KeyValue.Buffer,
                           ((ULONG)wcslen(KeyValue.Buffer) + 1) * sizeof(WCHAR));

cleanup:
    if (NT_SUCCESS(Status))
    {
        /* Duplicate the string to return it */
        Status = RtlDuplicateUnicodeString(RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE,
                                           &KeyValue,
                                           ParentIdPrefix);
    }
    ExFreePoolWithTag(ParentIdPrefixInformation, TAG_IO);
    RtlFreeUnicodeString(&KeyName);
    if (hKey != NULL)
    {
        ZwClose(hKey);
    }
    return Status;
}

static
CODE_SEG("INIT")
NTSTATUS
IopEnumerateDetectedDevices(
   IN HANDLE hBaseKey,
   IN PUNICODE_STRING RelativePath OPTIONAL,
   IN HANDLE hRootKey,
   IN BOOLEAN EnumerateSubKeys,
   IN PCM_FULL_RESOURCE_DESCRIPTOR ParentBootResources,
   IN ULONG ParentBootResourcesLength)
{
   UNICODE_STRING IdentifierU = RTL_CONSTANT_STRING(L"Identifier");
   UNICODE_STRING HardwareIDU = RTL_CONSTANT_STRING(L"HardwareID");
   UNICODE_STRING ConfigurationDataU = RTL_CONSTANT_STRING(L"Configuration Data");
   UNICODE_STRING BootConfigU = RTL_CONSTANT_STRING(L"BootConfig");
   UNICODE_STRING LogConfU = RTL_CONSTANT_STRING(L"LogConf");
   OBJECT_ATTRIBUTES ObjectAttributes;
   HANDLE hDevicesKey = NULL;
   HANDLE hDeviceKey = NULL;
   HANDLE hLevel1Key, hLevel2Key = NULL, hLogConf;
   UNICODE_STRING Level2NameU;
   WCHAR Level2Name[5];
   ULONG IndexDevice = 0;
   ULONG IndexSubKey;
   PKEY_BASIC_INFORMATION pDeviceInformation = NULL;
   ULONG DeviceInfoLength = sizeof(KEY_BASIC_INFORMATION) + 50 * sizeof(WCHAR);
   PKEY_VALUE_PARTIAL_INFORMATION pValueInformation = NULL;
   ULONG ValueInfoLength = sizeof(KEY_VALUE_PARTIAL_INFORMATION) + 50 * sizeof(WCHAR);
   UNICODE_STRING DeviceName, ValueName;
   ULONG RequiredSize;
   PCM_FULL_RESOURCE_DESCRIPTOR BootResources = NULL;
   ULONG BootResourcesLength;
   NTSTATUS Status;

   const UNICODE_STRING IdentifierSerial = RTL_CONSTANT_STRING(L"SerialController");
   UNICODE_STRING HardwareIdSerial = RTL_CONSTANT_STRING(L"*PNP0501\0");
   static ULONG DeviceIndexSerial = 0;
   const UNICODE_STRING IdentifierKeyboard = RTL_CONSTANT_STRING(L"KeyboardController");
   UNICODE_STRING HardwareIdKeyboard = RTL_CONSTANT_STRING(L"*PNP0303\0");
   static ULONG DeviceIndexKeyboard = 0;
   const UNICODE_STRING IdentifierMouse = RTL_CONSTANT_STRING(L"PointerController");
   /* FIXME: IopEnumerateDetectedDevices() should be rewritten.
    * The PnP identifiers can either be hardcoded or parsed from a LegacyXlate
    * sections of driver INF files.
    */
#if defined(SARCH_PC98)
   UNICODE_STRING HardwareIdMouse = RTL_CONSTANT_STRING(L"*nEC1F00\0");
#else
   UNICODE_STRING HardwareIdMouse = RTL_CONSTANT_STRING(L"*PNP0F13\0");
#endif
   static ULONG DeviceIndexMouse = 0;
   const UNICODE_STRING IdentifierParallel = RTL_CONSTANT_STRING(L"ParallelController");
   UNICODE_STRING HardwareIdParallel = RTL_CONSTANT_STRING(L"*PNP0400\0");
   static ULONG DeviceIndexParallel = 0;
   const UNICODE_STRING IdentifierFloppy = RTL_CONSTANT_STRING(L"FloppyDiskPeripheral");
   UNICODE_STRING HardwareIdFloppy = RTL_CONSTANT_STRING(L"*PNP0700\0");
   static ULONG DeviceIndexFloppy = 0;
   UNICODE_STRING HardwareIdKey;
   PUNICODE_STRING pHardwareId;
   ULONG DeviceIndex = 0;
   PUCHAR CmResourceList;
   ULONG ListCount;

    if (RelativePath)
    {
        Status = IopOpenRegistryKeyEx(&hDevicesKey, hBaseKey, RelativePath, KEY_ENUMERATE_SUB_KEYS);
        if (!NT_SUCCESS(Status))
        {
            DPRINT("ZwOpenKey() failed with status 0x%08lx\n", Status);
            goto cleanup;
        }
    }
    else
        hDevicesKey = hBaseKey;

   pDeviceInformation = ExAllocatePool(PagedPool, DeviceInfoLength);
   if (!pDeviceInformation)
   {
      DPRINT("ExAllocatePool() failed\n");
      Status = STATUS_NO_MEMORY;
      goto cleanup;
   }

   pValueInformation = ExAllocatePool(PagedPool, ValueInfoLength);
   if (!pValueInformation)
   {
      DPRINT("ExAllocatePool() failed\n");
      Status = STATUS_NO_MEMORY;
      goto cleanup;
   }

   while (TRUE)
   {
      Status = ZwEnumerateKey(hDevicesKey, IndexDevice, KeyBasicInformation, pDeviceInformation, DeviceInfoLength, &RequiredSize);
      if (Status == STATUS_NO_MORE_ENTRIES)
         break;
      else if (Status == STATUS_BUFFER_OVERFLOW || Status == STATUS_BUFFER_TOO_SMALL)
      {
         ExFreePool(pDeviceInformation);
         DeviceInfoLength = RequiredSize;
         pDeviceInformation = ExAllocatePool(PagedPool, DeviceInfoLength);
         if (!pDeviceInformation)
         {
            DPRINT("ExAllocatePool() failed\n");
            Status = STATUS_NO_MEMORY;
            goto cleanup;
         }
         Status = ZwEnumerateKey(hDevicesKey, IndexDevice, KeyBasicInformation, pDeviceInformation, DeviceInfoLength, &RequiredSize);
      }
      if (!NT_SUCCESS(Status))
      {
         DPRINT("ZwEnumerateKey() failed with status 0x%08lx\n", Status);
         goto cleanup;
      }
      IndexDevice++;

      /* Open device key */
      DeviceName.Length = DeviceName.MaximumLength = (USHORT)pDeviceInformation->NameLength;
      DeviceName.Buffer = pDeviceInformation->Name;

      Status = IopOpenRegistryKeyEx(&hDeviceKey, hDevicesKey, &DeviceName,
          KEY_QUERY_VALUE + (EnumerateSubKeys ? KEY_ENUMERATE_SUB_KEYS : 0));
      if (!NT_SUCCESS(Status))
      {
         DPRINT("ZwOpenKey() failed with status 0x%08lx\n", Status);
         goto cleanup;
      }

      /* Read boot resources, and add then to parent ones */
      Status = ZwQueryValueKey(hDeviceKey, &ConfigurationDataU, KeyValuePartialInformation, pValueInformation, ValueInfoLength, &RequiredSize);
      if (Status == STATUS_BUFFER_OVERFLOW || Status == STATUS_BUFFER_TOO_SMALL)
      {
         ExFreePool(pValueInformation);
         ValueInfoLength = RequiredSize;
         pValueInformation = ExAllocatePool(PagedPool, ValueInfoLength);
         if (!pValueInformation)
         {
            DPRINT("ExAllocatePool() failed\n");
            ZwDeleteKey(hLevel2Key);
            Status = STATUS_NO_MEMORY;
            goto cleanup;
         }
         Status = ZwQueryValueKey(hDeviceKey, &ConfigurationDataU, KeyValuePartialInformation, pValueInformation, ValueInfoLength, &RequiredSize);
      }
      if (Status == STATUS_OBJECT_NAME_NOT_FOUND)
      {
         BootResources = ParentBootResources;
         BootResourcesLength = ParentBootResourcesLength;
      }
      else if (!NT_SUCCESS(Status))
      {
         DPRINT("ZwQueryValueKey() failed with status 0x%08lx\n", Status);
         goto nextdevice;
      }
      else if (pValueInformation->Type != REG_FULL_RESOURCE_DESCRIPTOR)
      {
         DPRINT("Wrong registry type: got 0x%lx, expected 0x%lx\n", pValueInformation->Type, REG_FULL_RESOURCE_DESCRIPTOR);
         goto nextdevice;
      }
      else
      {
         static const ULONG Header = FIELD_OFFSET(CM_FULL_RESOURCE_DESCRIPTOR, PartialResourceList.PartialDescriptors);

         /* Concatenate current resources and parent ones */
         if (ParentBootResourcesLength == 0)
            BootResourcesLength = pValueInformation->DataLength;
         else
            BootResourcesLength = ParentBootResourcesLength
            + pValueInformation->DataLength
               - Header;
         BootResources = ExAllocatePool(PagedPool, BootResourcesLength);
         if (!BootResources)
         {
            DPRINT("ExAllocatePool() failed\n");
            goto nextdevice;
         }
         if (ParentBootResourcesLength < sizeof(CM_FULL_RESOURCE_DESCRIPTOR))
         {
            RtlCopyMemory(BootResources, pValueInformation->Data, pValueInformation->DataLength);
         }
         else if (ParentBootResources->PartialResourceList.PartialDescriptors[ParentBootResources->PartialResourceList.Count - 1].Type == CmResourceTypeDeviceSpecific)
         {
            RtlCopyMemory(BootResources, pValueInformation->Data, pValueInformation->DataLength);
            RtlCopyMemory(
               (PVOID)((ULONG_PTR)BootResources + pValueInformation->DataLength),
               (PVOID)((ULONG_PTR)ParentBootResources + Header),
               ParentBootResourcesLength - Header);
            BootResources->PartialResourceList.Count += ParentBootResources->PartialResourceList.Count;
         }
         else
         {
            RtlCopyMemory(BootResources, pValueInformation->Data, Header);
            RtlCopyMemory(
               (PVOID)((ULONG_PTR)BootResources + Header),
               (PVOID)((ULONG_PTR)ParentBootResources + Header),
               ParentBootResourcesLength - Header);
            RtlCopyMemory(
               (PVOID)((ULONG_PTR)BootResources + ParentBootResourcesLength),
               pValueInformation->Data + Header,
               pValueInformation->DataLength - Header);
            BootResources->PartialResourceList.Count += ParentBootResources->PartialResourceList.Count;
         }
      }

      if (EnumerateSubKeys)
      {
         IndexSubKey = 0;
         while (TRUE)
         {
            Status = ZwEnumerateKey(hDeviceKey, IndexSubKey, KeyBasicInformation, pDeviceInformation, DeviceInfoLength, &RequiredSize);
            if (Status == STATUS_NO_MORE_ENTRIES)
               break;
            else if (Status == STATUS_BUFFER_OVERFLOW || Status == STATUS_BUFFER_TOO_SMALL)
            {
               ExFreePool(pDeviceInformation);
               DeviceInfoLength = RequiredSize;
               pDeviceInformation = ExAllocatePool(PagedPool, DeviceInfoLength);
               if (!pDeviceInformation)
               {
                  DPRINT("ExAllocatePool() failed\n");
                  Status = STATUS_NO_MEMORY;
                  goto cleanup;
               }
               Status = ZwEnumerateKey(hDeviceKey, IndexSubKey, KeyBasicInformation, pDeviceInformation, DeviceInfoLength, &RequiredSize);
            }
            if (!NT_SUCCESS(Status))
            {
               DPRINT("ZwEnumerateKey() failed with status 0x%08lx\n", Status);
               goto cleanup;
            }
            IndexSubKey++;
            DeviceName.Length = DeviceName.MaximumLength = (USHORT)pDeviceInformation->NameLength;
            DeviceName.Buffer = pDeviceInformation->Name;

            Status = IopEnumerateDetectedDevices(
               hDeviceKey,
               &DeviceName,
               hRootKey,
               TRUE,
               BootResources,
               BootResourcesLength);
            if (!NT_SUCCESS(Status))
               goto cleanup;
         }
      }

      /* Read identifier */
      Status = ZwQueryValueKey(hDeviceKey, &IdentifierU, KeyValuePartialInformation, pValueInformation, ValueInfoLength, &RequiredSize);
      if (Status == STATUS_BUFFER_OVERFLOW || Status == STATUS_BUFFER_TOO_SMALL)
      {
         ExFreePool(pValueInformation);
         ValueInfoLength = RequiredSize;
         pValueInformation = ExAllocatePool(PagedPool, ValueInfoLength);
         if (!pValueInformation)
         {
            DPRINT("ExAllocatePool() failed\n");
            Status = STATUS_NO_MEMORY;
            goto cleanup;
         }
         Status = ZwQueryValueKey(hDeviceKey, &IdentifierU, KeyValuePartialInformation, pValueInformation, ValueInfoLength, &RequiredSize);
      }
      if (!NT_SUCCESS(Status))
      {
         if (Status != STATUS_OBJECT_NAME_NOT_FOUND)
         {
            DPRINT("ZwQueryValueKey() failed with status 0x%08lx\n", Status);
            goto nextdevice;
         }
         ValueName.Length = ValueName.MaximumLength = 0;
      }
      else if (pValueInformation->Type != REG_SZ)
      {
         DPRINT("Wrong registry type: got 0x%lx, expected 0x%lx\n", pValueInformation->Type, REG_SZ);
         goto nextdevice;
      }
      else
      {
         /* Assign hardware id to this device */
         ValueName.Length = ValueName.MaximumLength = (USHORT)pValueInformation->DataLength;
         ValueName.Buffer = (PWCHAR)pValueInformation->Data;
         if (ValueName.Length >= sizeof(WCHAR) && ValueName.Buffer[ValueName.Length / sizeof(WCHAR) - 1] == UNICODE_NULL)
            ValueName.Length -= sizeof(WCHAR);
      }

      if (RelativePath && RtlCompareUnicodeString(RelativePath, &IdentifierSerial, FALSE) == 0)
      {
         pHardwareId = &HardwareIdSerial;
         DeviceIndex = DeviceIndexSerial++;
      }
      else if (RelativePath && RtlCompareUnicodeString(RelativePath, &IdentifierKeyboard, FALSE) == 0)
      {
         pHardwareId = &HardwareIdKeyboard;
         DeviceIndex = DeviceIndexKeyboard++;
      }
      else if (RelativePath && RtlCompareUnicodeString(RelativePath, &IdentifierMouse, FALSE) == 0)
      {
         pHardwareId = &HardwareIdMouse;
         DeviceIndex = DeviceIndexMouse++;
      }
      else if (RelativePath && RtlCompareUnicodeString(RelativePath, &IdentifierParallel, FALSE) == 0)
      {
         pHardwareId = &HardwareIdParallel;
         DeviceIndex = DeviceIndexParallel++;
      }
      else if (RelativePath && RtlCompareUnicodeString(RelativePath, &IdentifierFloppy, FALSE) == 0)
      {
         pHardwareId = &HardwareIdFloppy;
         DeviceIndex = DeviceIndexFloppy++;
      }
      else
      {
         /* Unknown key path */
         DPRINT("Unknown key path '%wZ'\n", RelativePath);
         goto nextdevice;
      }

      /* Prepare hardware id key (hardware id value without final \0) */
      HardwareIdKey = *pHardwareId;
      HardwareIdKey.Length -= sizeof(UNICODE_NULL);

      /* Add the detected device to Root key */
      InitializeObjectAttributes(&ObjectAttributes, &HardwareIdKey, OBJ_KERNEL_HANDLE, hRootKey, NULL);
      Status = ZwCreateKey(
         &hLevel1Key,
         KEY_CREATE_SUB_KEY,
         &ObjectAttributes,
         0,
         NULL,
         REG_OPTION_NON_VOLATILE,
         NULL);
      if (!NT_SUCCESS(Status))
      {
         DPRINT("ZwCreateKey() failed with status 0x%08lx\n", Status);
         goto nextdevice;
      }
      swprintf(Level2Name, L"%04lu", DeviceIndex);
      RtlInitUnicodeString(&Level2NameU, Level2Name);
      InitializeObjectAttributes(&ObjectAttributes, &Level2NameU, OBJ_KERNEL_HANDLE, hLevel1Key, NULL);
      Status = ZwCreateKey(
         &hLevel2Key,
         KEY_SET_VALUE | KEY_CREATE_SUB_KEY,
         &ObjectAttributes,
         0,
         NULL,
         REG_OPTION_NON_VOLATILE,
         NULL);
      ZwClose(hLevel1Key);
      if (!NT_SUCCESS(Status))
      {
         DPRINT("ZwCreateKey() failed with status 0x%08lx\n", Status);
         goto nextdevice;
      }
      DPRINT("Found %wZ #%lu (%wZ)\n", &ValueName, DeviceIndex, &HardwareIdKey);
      Status = ZwSetValueKey(hLevel2Key, &HardwareIDU, 0, REG_MULTI_SZ, pHardwareId->Buffer, pHardwareId->MaximumLength);
      if (!NT_SUCCESS(Status))
      {
         DPRINT("ZwSetValueKey() failed with status 0x%08lx\n", Status);
         ZwDeleteKey(hLevel2Key);
         goto nextdevice;
      }
      /* Create 'LogConf' subkey */
      InitializeObjectAttributes(&ObjectAttributes, &LogConfU, OBJ_KERNEL_HANDLE, hLevel2Key, NULL);
      Status = ZwCreateKey(
         &hLogConf,
         KEY_SET_VALUE,
         &ObjectAttributes,
         0,
         NULL,
         REG_OPTION_VOLATILE,
         NULL);
      if (!NT_SUCCESS(Status))
      {
         DPRINT("ZwCreateKey() failed with status 0x%08lx\n", Status);
         ZwDeleteKey(hLevel2Key);
         goto nextdevice;
      }
      if (BootResourcesLength >= sizeof(CM_FULL_RESOURCE_DESCRIPTOR))
      {
         CmResourceList = ExAllocatePool(PagedPool, BootResourcesLength + sizeof(ULONG));
         if (!CmResourceList)
         {
            ZwClose(hLogConf);
            ZwDeleteKey(hLevel2Key);
            goto nextdevice;
         }

         /* Add the list count (1st member of CM_RESOURCE_LIST) */
         ListCount = 1;
         RtlCopyMemory(CmResourceList,
                       &ListCount,
                       sizeof(ULONG));

         /* Now add the actual list (2nd member of CM_RESOURCE_LIST) */
         RtlCopyMemory(CmResourceList + sizeof(ULONG),
                       BootResources,
                       BootResourcesLength);

         /* Save boot resources to 'LogConf\BootConfig' */
         Status = ZwSetValueKey(hLogConf, &BootConfigU, 0, REG_RESOURCE_LIST, CmResourceList, BootResourcesLength + sizeof(ULONG));
         if (!NT_SUCCESS(Status))
         {
            DPRINT("ZwSetValueKey() failed with status 0x%08lx\n", Status);
            ZwClose(hLogConf);
            ZwDeleteKey(hLevel2Key);
            goto nextdevice;
         }
      }
      ZwClose(hLogConf);

nextdevice:
      if (BootResources && BootResources != ParentBootResources)
      {
         ExFreePool(BootResources);
         BootResources = NULL;
      }
      if (hLevel2Key)
      {
         ZwClose(hLevel2Key);
         hLevel2Key = NULL;
      }
      if (hDeviceKey)
      {
         ZwClose(hDeviceKey);
         hDeviceKey = NULL;
      }
   }

   Status = STATUS_SUCCESS;

cleanup:
   if (hDevicesKey && hDevicesKey != hBaseKey)
      ZwClose(hDevicesKey);
   if (hDeviceKey)
      ZwClose(hDeviceKey);
   if (pDeviceInformation)
      ExFreePool(pDeviceInformation);
   if (pValueInformation)
      ExFreePool(pValueInformation);
   return Status;
}

static
CODE_SEG("INIT")
BOOLEAN
IopIsFirmwareMapperDisabled(VOID)
{
    UNICODE_STRING KeyPathU = RTL_CONSTANT_STRING(L"\\Registry\\Machine\\SYSTEM\\CURRENTCONTROLSET\\Control\\Pnp");
    UNICODE_STRING KeyNameU = RTL_CONSTANT_STRING(L"DisableFirmwareMapper");
    OBJECT_ATTRIBUTES ObjectAttributes;
    HANDLE hPnpKey;
    PKEY_VALUE_PARTIAL_INFORMATION KeyInformation;
    ULONG DesiredLength, Length;
    ULONG KeyValue = 0;
    NTSTATUS Status;

    InitializeObjectAttributes(&ObjectAttributes, &KeyPathU, OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE, NULL, NULL);
    Status = ZwOpenKey(&hPnpKey, KEY_QUERY_VALUE, &ObjectAttributes);
    if (NT_SUCCESS(Status))
    {
        Status = ZwQueryValueKey(hPnpKey,
                                 &KeyNameU,
                                 KeyValuePartialInformation,
                                 NULL,
                                 0,
                                 &DesiredLength);
        if ((Status == STATUS_BUFFER_TOO_SMALL) ||
            (Status == STATUS_BUFFER_OVERFLOW))
        {
            Length = DesiredLength;
            KeyInformation = ExAllocatePool(PagedPool, Length);
            if (KeyInformation)
            {
                Status = ZwQueryValueKey(hPnpKey,
                                         &KeyNameU,
                                         KeyValuePartialInformation,
                                         KeyInformation,
                                         Length,
                                         &DesiredLength);
                if (NT_SUCCESS(Status) && KeyInformation->DataLength == sizeof(ULONG))
                {
                    KeyValue = (ULONG)(*KeyInformation->Data);
                }
                else
                {
                    DPRINT1("ZwQueryValueKey(%wZ%wZ) failed\n", &KeyPathU, &KeyNameU);
                }

                ExFreePool(KeyInformation);
            }
            else
            {
                DPRINT1("Failed to allocate memory for registry query\n");
            }
        }
        else
        {
            DPRINT1("ZwQueryValueKey(%wZ%wZ) failed with status 0x%08lx\n", &KeyPathU, &KeyNameU, Status);
        }

        ZwClose(hPnpKey);
    }
    else
    {
        DPRINT1("ZwOpenKey(%wZ) failed with status 0x%08lx\n", &KeyPathU, Status);
    }

    DPRINT("Firmware mapper is %s\n", KeyValue != 0 ? "disabled" : "enabled");

    return (KeyValue != 0) ? TRUE : FALSE;
}

CODE_SEG("INIT")
NTSTATUS
NTAPI
IopUpdateRootKey(VOID)
{
    UNICODE_STRING EnumU = RTL_CONSTANT_STRING(L"\\Registry\\Machine\\SYSTEM\\CurrentControlSet\\Enum");
    UNICODE_STRING RootPathU = RTL_CONSTANT_STRING(L"Root");
    UNICODE_STRING MultiKeyPathU = RTL_CONSTANT_STRING(L"\\Registry\\Machine\\HARDWARE\\DESCRIPTION\\System\\MultifunctionAdapter");
    OBJECT_ATTRIBUTES ObjectAttributes;
    HANDLE hEnum, hRoot;
    NTSTATUS Status;

    InitializeObjectAttributes(&ObjectAttributes, &EnumU, OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE, NULL, NULL);
    Status = ZwCreateKey(&hEnum, KEY_CREATE_SUB_KEY, &ObjectAttributes, 0, NULL, REG_OPTION_NON_VOLATILE, NULL);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("ZwCreateKey() failed with status 0x%08lx\n", Status);
        return Status;
    }

    InitializeObjectAttributes(&ObjectAttributes, &RootPathU, OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE, hEnum, NULL);
    Status = ZwCreateKey(&hRoot, KEY_CREATE_SUB_KEY, &ObjectAttributes, 0, NULL, REG_OPTION_NON_VOLATILE, NULL);
    ZwClose(hEnum);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("ZwOpenKey() failed with status 0x%08lx\n", Status);
        return Status;
    }

    if (!IopIsFirmwareMapperDisabled())
    {
        Status = IopOpenRegistryKeyEx(&hEnum, NULL, &MultiKeyPathU, KEY_ENUMERATE_SUB_KEYS);
        if (!NT_SUCCESS(Status))
        {
            /* Nothing to do, don't return with an error status */
            DPRINT("ZwOpenKey() failed with status 0x%08lx\n", Status);
            ZwClose(hRoot);
            return STATUS_SUCCESS;
        }
        Status = IopEnumerateDetectedDevices(
            hEnum,
            NULL,
            hRoot,
            TRUE,
            NULL,
            0);
        ZwClose(hEnum);
    }
    else
    {
        /* Enumeration is disabled */
        Status = STATUS_SUCCESS;
    }

    ZwClose(hRoot);

    return Status;
}

NTSTATUS
NTAPI
IopOpenRegistryKeyEx(PHANDLE KeyHandle,
                     HANDLE ParentKey,
                     PUNICODE_STRING Name,
                     ACCESS_MASK DesiredAccess)
{
    OBJECT_ATTRIBUTES ObjectAttributes;
    NTSTATUS Status;

    PAGED_CODE();

    *KeyHandle = NULL;

    InitializeObjectAttributes(&ObjectAttributes,
        Name,
        OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
        ParentKey,
        NULL);

    Status = ZwOpenKey(KeyHandle, DesiredAccess, &ObjectAttributes);

    return Status;
}

NTSTATUS
NTAPI
IopCreateRegistryKeyEx(OUT PHANDLE Handle,
                       IN HANDLE RootHandle OPTIONAL,
                       IN PUNICODE_STRING KeyName,
                       IN ACCESS_MASK DesiredAccess,
                       IN ULONG CreateOptions,
                       OUT PULONG Disposition OPTIONAL)
{
    OBJECT_ATTRIBUTES ObjectAttributes;
    ULONG KeyDisposition, RootHandleIndex = 0, i = 1, NestedCloseLevel = 0;
    USHORT Length;
    HANDLE HandleArray[2];
    BOOLEAN Recursing = TRUE;
    PWCHAR pp, p, p1;
    UNICODE_STRING KeyString;
    NTSTATUS Status = STATUS_SUCCESS;
    PAGED_CODE();

    /* P1 is start, pp is end */
    p1 = KeyName->Buffer;
    pp = (PVOID)((ULONG_PTR)p1 + KeyName->Length);

    /* Create the target key */
    InitializeObjectAttributes(&ObjectAttributes,
                               KeyName,
                               OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                               RootHandle,
                               NULL);
    Status = ZwCreateKey(&HandleArray[i],
                         DesiredAccess,
                         &ObjectAttributes,
                         0,
                         NULL,
                         CreateOptions,
                         &KeyDisposition);

    /* Now we check if this failed */
    if ((Status == STATUS_OBJECT_NAME_NOT_FOUND) && (RootHandle))
    {
        /* Target key failed, so we'll need to create its parent. Setup array */
        HandleArray[0] = NULL;
        HandleArray[1] = RootHandle;

        /* Keep recursing for each missing parent */
        while (Recursing)
        {
            /* And if we're deep enough, close the last handle */
            if (NestedCloseLevel > 1) ZwClose(HandleArray[RootHandleIndex]);

            /* We're setup to ping-pong between the two handle array entries */
            RootHandleIndex = i;
            i = (i + 1) & 1;

            /* Clear the one we're attempting to open now */
            HandleArray[i] = NULL;

            /* Process the parent key name */
            for (p = p1; ((p < pp) && (*p != OBJ_NAME_PATH_SEPARATOR)); p++);
            Length = (USHORT)(p - p1) * sizeof(WCHAR);

            /* Is there a parent name? */
            if (Length)
            {
                /* Build the unicode string for it */
                KeyString.Buffer = p1;
                KeyString.Length = KeyString.MaximumLength = Length;

                /* Now try opening the parent */
                InitializeObjectAttributes(&ObjectAttributes,
                                           &KeyString,
                                           OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                                           HandleArray[RootHandleIndex],
                                           NULL);
                Status = ZwCreateKey(&HandleArray[i],
                                     DesiredAccess,
                                     &ObjectAttributes,
                                     0,
                                     NULL,
                                     CreateOptions,
                                     &KeyDisposition);
                if (NT_SUCCESS(Status))
                {
                    /* It worked, we have one more handle */
                    NestedCloseLevel++;
                }
                else
                {
                    /* Parent key creation failed, abandon loop */
                    Recursing = FALSE;
                    continue;
                }
            }
            else
            {
                /* We don't have a parent name, probably corrupted key name */
                Status = STATUS_INVALID_PARAMETER;
                Recursing = FALSE;
                continue;
            }

            /* Now see if there's more parents to create */
            p1 = p + 1;
            if ((p == pp) || (p1 == pp))
            {
                /* We're done, hopefully successfully, so stop */
                Recursing = FALSE;
            }
        }

        /* Outer loop check for handle nesting that requires closing the top handle */
        if (NestedCloseLevel > 1) ZwClose(HandleArray[RootHandleIndex]);
    }

    /* Check if we broke out of the loop due to success */
    if (NT_SUCCESS(Status))
    {
        /* Return the target handle (we closed all the parent ones) and disposition */
        *Handle = HandleArray[i];
        if (Disposition) *Disposition = KeyDisposition;
    }

    /* Return the success state */
    return Status;
}

NTSTATUS
NTAPI
IopGetRegistryValue(IN HANDLE Handle,
                    IN PWSTR ValueName,
                    OUT PKEY_VALUE_FULL_INFORMATION *Information)
{
    UNICODE_STRING ValueString;
    NTSTATUS Status;
    PKEY_VALUE_FULL_INFORMATION FullInformation;
    ULONG Size;
    PAGED_CODE();

    RtlInitUnicodeString(&ValueString, ValueName);

    Status = ZwQueryValueKey(Handle,
                             &ValueString,
                             KeyValueFullInformation,
                             NULL,
                             0,
                             &Size);
    if ((Status != STATUS_BUFFER_OVERFLOW) &&
        (Status != STATUS_BUFFER_TOO_SMALL))
    {
        return Status;
    }

    FullInformation = ExAllocatePool(NonPagedPool, Size);
    if (!FullInformation) return STATUS_INSUFFICIENT_RESOURCES;

    Status = ZwQueryValueKey(Handle,
                             &ValueString,
                             KeyValueFullInformation,
                             FullInformation,
                             Size,
                             &Size);
    if (!NT_SUCCESS(Status))
    {
        ExFreePool(FullInformation);
        return Status;
    }

    *Information = FullInformation;
    return STATUS_SUCCESS;
}

RTL_GENERIC_COMPARE_RESULTS
NTAPI
PiCompareInstancePath(IN PRTL_AVL_TABLE Table,
                      IN PVOID FirstStruct,
                      IN PVOID SecondStruct)
{
    /* FIXME: TODO */
    ASSERT(FALSE);
    return 0;
}

//
//  The allocation function is called by the generic table package whenever
//  it needs to allocate memory for the table.
//

PVOID
NTAPI
PiAllocateGenericTableEntry(IN PRTL_AVL_TABLE Table,
                            IN CLONG ByteSize)
{
    /* FIXME: TODO */
    ASSERT(FALSE);
    return NULL;
}

VOID
NTAPI
PiFreeGenericTableEntry(IN PRTL_AVL_TABLE Table,
                        IN PVOID Buffer)
{
    /* FIXME: TODO */
    ASSERT(FALSE);
}

VOID
NTAPI
PpInitializeDeviceReferenceTable(VOID)
{
    /* Setup the guarded mutex and AVL table */
    KeInitializeGuardedMutex(&PpDeviceReferenceTableLock);
    RtlInitializeGenericTableAvl(
        &PpDeviceReferenceTable,
        (PRTL_AVL_COMPARE_ROUTINE)PiCompareInstancePath,
        (PRTL_AVL_ALLOCATE_ROUTINE)PiAllocateGenericTableEntry,
        (PRTL_AVL_FREE_ROUTINE)PiFreeGenericTableEntry,
        NULL);
}

BOOLEAN
NTAPI
PiInitPhase0(VOID)
{
    /* Initialize the resource when accessing device registry data */
    ExInitializeResourceLite(&PpRegistryDeviceResource);

    /* Setup the device reference AVL table */
    PpInitializeDeviceReferenceTable();
    return TRUE;
}

BOOLEAN
NTAPI
PpInitSystem(VOID)
{
    /* Check the initialization phase */
    switch (ExpInitializationPhase)
    {
    case 0:

        /* Do Phase 0 */
        return PiInitPhase0();

    case 1:

        /* Do Phase 1 */
        return TRUE;
        //return PiInitPhase1();

    default:

        /* Don't know any other phase! Bugcheck! */
        KeBugCheck(UNEXPECTED_INITIALIZATION_CALL);
        return FALSE;
    }
}

/* PUBLIC FUNCTIONS **********************************************************/

NTSTATUS
NTAPI
PnpBusTypeGuidGet(IN USHORT Index,
                  IN LPGUID BusTypeGuid)
{
    NTSTATUS Status = STATUS_SUCCESS;

    /* Acquire the lock */
    ExAcquireFastMutex(&PnpBusTypeGuidList->Lock);

    /* Validate size */
    if (Index < PnpBusTypeGuidList->GuidCount)
    {
        /* Copy the data */
        RtlCopyMemory(BusTypeGuid, &PnpBusTypeGuidList->Guids[Index], sizeof(GUID));
    }
    else
    {
        /* Failure path */
        Status = STATUS_OBJECT_NAME_NOT_FOUND;
    }

    /* Release lock and return status */
    ExReleaseFastMutex(&PnpBusTypeGuidList->Lock);
    return Status;
}

NTSTATUS
NTAPI
PnpDeviceObjectToDeviceInstance(IN PDEVICE_OBJECT DeviceObject,
                                IN PHANDLE DeviceInstanceHandle,
                                IN ACCESS_MASK DesiredAccess)
{
    NTSTATUS Status;
    HANDLE KeyHandle;
    PDEVICE_NODE DeviceNode;
    UNICODE_STRING KeyName = RTL_CONSTANT_STRING(L"\\REGISTRY\\MACHINE\\SYSTEM\\CURRENTCONTROLSET\\ENUM");
    PAGED_CODE();

    /* Open the enum key */
    Status = IopOpenRegistryKeyEx(&KeyHandle,
                                  NULL,
                                  &KeyName,
                                  KEY_READ);
    if (!NT_SUCCESS(Status)) return Status;

    /* Make sure we have an instance path */
    DeviceNode = IopGetDeviceNode(DeviceObject);
    if ((DeviceNode) && (DeviceNode->InstancePath.Length))
    {
        /* Get the instance key */
        Status = IopOpenRegistryKeyEx(DeviceInstanceHandle,
                                      KeyHandle,
                                      &DeviceNode->InstancePath,
                                      DesiredAccess);
    }
    else
    {
        /* Fail */
        Status = STATUS_INVALID_DEVICE_REQUEST;
    }

    /* Close the handle and return status */
    ZwClose(KeyHandle);
    return Status;
}

ULONG
NTAPI
PnpDetermineResourceListSize(IN PCM_RESOURCE_LIST ResourceList)
{
    ULONG FinalSize, PartialSize, EntrySize, i, j;
    PCM_FULL_RESOURCE_DESCRIPTOR FullDescriptor;
    PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor;

    /* If we don't have one, that's easy */
    if (!ResourceList) return 0;

    /* Start with the minimum size possible */
    FinalSize = FIELD_OFFSET(CM_RESOURCE_LIST, List);

    /* Loop each full descriptor */
    FullDescriptor = ResourceList->List;
    for (i = 0; i < ResourceList->Count; i++)
    {
        /* Start with the minimum size possible */
        PartialSize = FIELD_OFFSET(CM_FULL_RESOURCE_DESCRIPTOR, PartialResourceList) +
        FIELD_OFFSET(CM_PARTIAL_RESOURCE_LIST, PartialDescriptors);

        /* Loop each partial descriptor */
        PartialDescriptor = FullDescriptor->PartialResourceList.PartialDescriptors;
        for (j = 0; j < FullDescriptor->PartialResourceList.Count; j++)
        {
            /* Start with the minimum size possible */
            EntrySize = sizeof(CM_PARTIAL_RESOURCE_DESCRIPTOR);

            /* Check if there is extra data */
            if (PartialDescriptor->Type == CmResourceTypeDeviceSpecific)
            {
                /* Add that data */
                EntrySize += PartialDescriptor->u.DeviceSpecificData.DataSize;
            }

            /* The size of partial descriptors is bigger */
            PartialSize += EntrySize;

            /* Go to the next partial descriptor */
            PartialDescriptor = (PVOID)((ULONG_PTR)PartialDescriptor + EntrySize);
        }

        /* The size of full descriptors is bigger */
        FinalSize += PartialSize;

        /* Go to the next full descriptor */
        FullDescriptor = (PVOID)((ULONG_PTR)FullDescriptor + PartialSize);
    }

    /* Return the final size */
    return FinalSize;
}

NTSTATUS
NTAPI
PiGetDeviceRegistryProperty(IN PDEVICE_OBJECT DeviceObject,
                            IN ULONG ValueType,
                            IN PWSTR ValueName,
                            IN PWSTR KeyName,
                            OUT PVOID Buffer,
                            IN PULONG BufferLength)
{
    NTSTATUS Status;
    HANDLE KeyHandle, SubHandle;
    UNICODE_STRING KeyString;
    PKEY_VALUE_FULL_INFORMATION KeyValueInfo = NULL;
    ULONG Length;
    PAGED_CODE();

    /* Find the instance key */
    Status = PnpDeviceObjectToDeviceInstance(DeviceObject, &KeyHandle, KEY_READ);
    if (NT_SUCCESS(Status))
    {
        /* Check for name given by caller */
        if (KeyName)
        {
            /* Open this key */
            RtlInitUnicodeString(&KeyString, KeyName);
            Status = IopOpenRegistryKeyEx(&SubHandle,
                                          KeyHandle,
                                          &KeyString,
                                          KEY_READ);
            if (NT_SUCCESS(Status))
            {
                /* And use this handle instead */
                ZwClose(KeyHandle);
                KeyHandle = SubHandle;
            }
        }

        /* Check if sub-key handle succeeded (or no-op if no key name given) */
        if (NT_SUCCESS(Status))
        {
            /* Now get the size of the property */
            Status = IopGetRegistryValue(KeyHandle,
                                         ValueName,
                                         &KeyValueInfo);
        }

        /* Close the key */
        ZwClose(KeyHandle);
    }

    /* Fail if any of the registry operations failed */
    if (!NT_SUCCESS(Status)) return Status;

    /* Check how much data we have to copy */
    Length = KeyValueInfo->DataLength;
    if (*BufferLength >= Length)
    {
        /* Check for a match in the value type */
        if (KeyValueInfo->Type == ValueType)
        {
            /* Copy the data */
            RtlCopyMemory(Buffer,
                          (PVOID)((ULONG_PTR)KeyValueInfo +
                          KeyValueInfo->DataOffset),
                          Length);
        }
        else
        {
            /* Invalid registry property type, fail */
           Status = STATUS_INVALID_PARAMETER_2;
        }
    }
    else
    {
        /* Buffer is too small to hold data */
        Status = STATUS_BUFFER_TOO_SMALL;
    }

    /* Return the required buffer length, free the buffer, and return status */
    *BufferLength = Length;
    ExFreePool(KeyValueInfo);
    return Status;
}

#define PIP_RETURN_DATA(x, y)   {ReturnLength = x; Data = y; Status = STATUS_SUCCESS; break;}
#define PIP_REGISTRY_DATA(x, y) {ValueName = x; ValueType = y; break;}
#define PIP_UNIMPLEMENTED()     {UNIMPLEMENTED_DBGBREAK(); break;}

/*
 * @implemented
 */
NTSTATUS
NTAPI
IoGetDeviceProperty(IN PDEVICE_OBJECT DeviceObject,
                    IN DEVICE_REGISTRY_PROPERTY DeviceProperty,
                    IN ULONG BufferLength,
                    OUT PVOID PropertyBuffer,
                    OUT PULONG ResultLength)
{
    PDEVICE_NODE DeviceNode = IopGetDeviceNode(DeviceObject);
    DEVICE_CAPABILITIES DeviceCaps;
    ULONG ReturnLength = 0, Length = 0, ValueType;
    PWCHAR ValueName = NULL, EnumeratorNameEnd, DeviceInstanceName;
    PVOID Data = NULL;
    NTSTATUS Status = STATUS_BUFFER_TOO_SMALL;
    GUID BusTypeGuid;
    POBJECT_NAME_INFORMATION ObjectNameInfo = NULL;
    BOOLEAN NullTerminate = FALSE;
    DEVICE_REMOVAL_POLICY Policy;

    DPRINT("IoGetDeviceProperty(0x%p %d)\n", DeviceObject, DeviceProperty);

    /* Assume failure */
    *ResultLength = 0;

    /* Only PDOs can call this */
    if (!DeviceNode) return STATUS_INVALID_DEVICE_REQUEST;

    /* Handle all properties */
    switch (DeviceProperty)
    {
        case DevicePropertyBusTypeGuid:

            /* Get the GUID from the internal cache */
            Status = PnpBusTypeGuidGet(DeviceNode->ChildBusTypeIndex, &BusTypeGuid);
            if (!NT_SUCCESS(Status)) return Status;

            /* This is the format of the returned data */
            PIP_RETURN_DATA(sizeof(GUID), &BusTypeGuid);

        case DevicePropertyLegacyBusType:

            /* Validate correct interface type */
            if (DeviceNode->ChildInterfaceType == InterfaceTypeUndefined)
                return STATUS_OBJECT_NAME_NOT_FOUND;

            /* This is the format of the returned data */
            PIP_RETURN_DATA(sizeof(INTERFACE_TYPE), &DeviceNode->ChildInterfaceType);

        case DevicePropertyBusNumber:

            /* Validate correct bus number */
            if ((DeviceNode->ChildBusNumber & 0x80000000) == 0x80000000)
                return STATUS_OBJECT_NAME_NOT_FOUND;

            /* This is the format of the returned data */
            PIP_RETURN_DATA(sizeof(ULONG), &DeviceNode->ChildBusNumber);

        case DevicePropertyEnumeratorName:

            /* Get the instance path */
            DeviceInstanceName = DeviceNode->InstancePath.Buffer;

            /* Sanity checks */
            ASSERT((BufferLength & 1) == 0);
            ASSERT(DeviceInstanceName != NULL);

            /* Get the name from the path */
            EnumeratorNameEnd = wcschr(DeviceInstanceName, OBJ_NAME_PATH_SEPARATOR);
            ASSERT(EnumeratorNameEnd);

            /* This string needs to be NULL-terminated */
            NullTerminate = TRUE;

            /* This is the format of the returned data */
            PIP_RETURN_DATA((ULONG)(EnumeratorNameEnd - DeviceInstanceName) * sizeof(WCHAR),
                            DeviceInstanceName);

        case DevicePropertyAddress:

            /* Query the device caps */
            Status = IopQueryDeviceCapabilities(DeviceNode, &DeviceCaps);
            if (!NT_SUCCESS(Status) || (DeviceCaps.Address == MAXULONG))
                return STATUS_OBJECT_NAME_NOT_FOUND;

            /* This is the format of the returned data */
            PIP_RETURN_DATA(sizeof(ULONG), &DeviceCaps.Address);

        case DevicePropertyBootConfigurationTranslated:

            /* Validate we have resources */
            if (!DeviceNode->BootResources)
//            if (!DeviceNode->BootResourcesTranslated) // FIXFIX: Need this field
            {
                /* No resources will still fake success, but with 0 bytes */
                *ResultLength = 0;
                return STATUS_SUCCESS;
            }

            /* This is the format of the returned data */
            PIP_RETURN_DATA(PnpDetermineResourceListSize(DeviceNode->BootResources), // FIXFIX: Should use BootResourcesTranslated
                            DeviceNode->BootResources); // FIXFIX: Should use BootResourcesTranslated

        case DevicePropertyPhysicalDeviceObjectName:

            /* Sanity check for Unicode-sized string */
            ASSERT((BufferLength & 1) == 0);

            /* Allocate name buffer */
            Length = BufferLength + sizeof(OBJECT_NAME_INFORMATION);
            ObjectNameInfo = ExAllocatePool(PagedPool, Length);
            if (!ObjectNameInfo) return STATUS_INSUFFICIENT_RESOURCES;

            /* Query the PDO name */
            Status = ObQueryNameString(DeviceObject,
                                       ObjectNameInfo,
                                       Length,
                                       ResultLength);
            if (Status == STATUS_INFO_LENGTH_MISMATCH)
            {
                /* It's up to the caller to try again */
                Status = STATUS_BUFFER_TOO_SMALL;
            }

            /* This string needs to be NULL-terminated */
            NullTerminate = TRUE;

            /* Return if successful */
            if (NT_SUCCESS(Status)) PIP_RETURN_DATA(ObjectNameInfo->Name.Length,
                                                    ObjectNameInfo->Name.Buffer);

            /* Let the caller know how big the name is */
            *ResultLength -= sizeof(OBJECT_NAME_INFORMATION);
            break;

        case DevicePropertyRemovalPolicy:

            Policy = DeviceNode->RemovalPolicy;
            PIP_RETURN_DATA(sizeof(Policy), &Policy);

        /* Handle the registry-based properties */
        case DevicePropertyUINumber:
            PIP_REGISTRY_DATA(REGSTR_VAL_UI_NUMBER, REG_DWORD);
        case DevicePropertyLocationInformation:
            PIP_REGISTRY_DATA(REGSTR_VAL_LOCATION_INFORMATION, REG_SZ);
        case DevicePropertyDeviceDescription:
            PIP_REGISTRY_DATA(REGSTR_VAL_DEVDESC, REG_SZ);
        case DevicePropertyHardwareID:
            PIP_REGISTRY_DATA(REGSTR_VAL_HARDWAREID, REG_MULTI_SZ);
        case DevicePropertyCompatibleIDs:
            PIP_REGISTRY_DATA(REGSTR_VAL_COMPATIBLEIDS, REG_MULTI_SZ);
        case DevicePropertyBootConfiguration:
            PIP_REGISTRY_DATA(REGSTR_VAL_BOOTCONFIG, REG_RESOURCE_LIST);
        case DevicePropertyClassName:
            PIP_REGISTRY_DATA(REGSTR_VAL_CLASS, REG_SZ);
        case DevicePropertyClassGuid:
            PIP_REGISTRY_DATA(REGSTR_VAL_CLASSGUID, REG_SZ);
        case DevicePropertyDriverKeyName:
            PIP_REGISTRY_DATA(REGSTR_VAL_DRIVER, REG_SZ);
        case DevicePropertyManufacturer:
            PIP_REGISTRY_DATA(REGSTR_VAL_MFG, REG_SZ);
        case DevicePropertyFriendlyName:
            PIP_REGISTRY_DATA(REGSTR_VAL_FRIENDLYNAME, REG_SZ);
        case DevicePropertyContainerID:
            //PIP_REGISTRY_DATA(REGSTR_VAL_CONTAINERID, REG_SZ); // Win7
            PIP_UNIMPLEMENTED();
            break;
        case DevicePropertyInstallState:
            PIP_REGISTRY_DATA(REGSTR_VAL_CONFIGFLAGS, REG_DWORD);
            break;
        case DevicePropertyResourceRequirements:
            PIP_UNIMPLEMENTED();
        case DevicePropertyAllocatedResources:
            PIP_UNIMPLEMENTED();
        default:
            return STATUS_INVALID_PARAMETER_2;
    }

    /* Having a registry value name implies registry data */
    if (ValueName)
    {
        /* We know up-front how much data to expect */
        *ResultLength = BufferLength;

        /* Go get the data, use the LogConf subkey if necessary */
        Status = PiGetDeviceRegistryProperty(DeviceObject,
                                             ValueType,
                                             ValueName,
                                             (DeviceProperty ==
                                              DevicePropertyBootConfiguration) ?
                                             L"LogConf":  NULL,
                                             PropertyBuffer,
                                             ResultLength);
    }
    else if (NT_SUCCESS(Status))
    {
        /* We know up-front how much data to expect, check the caller's buffer */
        *ResultLength = ReturnLength + (NullTerminate ? sizeof(UNICODE_NULL) : 0);
        if (*ResultLength <= BufferLength)
        {
            /* Buffer is all good, copy the data */
            RtlCopyMemory(PropertyBuffer, Data, ReturnLength);

            /* Check if we need to NULL-terminate the string */
            if (NullTerminate)
            {
                /* Terminate the string */
                ((PWCHAR)PropertyBuffer)[ReturnLength / sizeof(WCHAR)] = UNICODE_NULL;
            }

            /* This is the success path */
            Status = STATUS_SUCCESS;
        }
        else
        {
            /* Failure path */
            Status = STATUS_BUFFER_TOO_SMALL;
        }
    }

    /* Free any allocation we may have made, and return the status code */
    if (ObjectNameInfo) ExFreePool(ObjectNameInfo);
    return Status;
}

NTSTATUS
NTAPI
IoOpenDeviceRegistryKey(IN PDEVICE_OBJECT DeviceObject,
                        IN ULONG DevInstKeyType,
                        IN ACCESS_MASK DesiredAccess,
                        OUT PHANDLE DevInstRegKey)
{
    static WCHAR RootKeyName[] =
        L"\\Registry\\Machine\\System\\CurrentControlSet\\";
    static WCHAR ProfileKeyName[] =
        L"Hardware Profiles\\Current\\System\\CurrentControlSet\\";
    static WCHAR ClassKeyName[] = L"Control\\Class\\";
    static WCHAR EnumKeyName[] = L"Enum\\";
    static WCHAR DeviceParametersKeyName[] = L"Device Parameters";
    ULONG KeyNameLength;
    PWSTR KeyNameBuffer;
    UNICODE_STRING KeyName;
    ULONG DriverKeyLength;
    OBJECT_ATTRIBUTES ObjectAttributes;
    PDEVICE_NODE DeviceNode = NULL;
    NTSTATUS Status;

    DPRINT("IoOpenDeviceRegistryKey() called\n");

    if ((DevInstKeyType & (PLUGPLAY_REGKEY_DEVICE | PLUGPLAY_REGKEY_DRIVER)) == 0)
    {
        DPRINT1("IoOpenDeviceRegistryKey(): got wrong params, exiting...\n");
        return STATUS_INVALID_PARAMETER;
    }

    if (!IopIsValidPhysicalDeviceObject(DeviceObject))
        return STATUS_INVALID_DEVICE_REQUEST;
    DeviceNode = IopGetDeviceNode(DeviceObject);

    /*
     * Calculate the length of the base key name. This is the full
     * name for driver key or the name excluding "Device Parameters"
     * subkey for device key.
     */

    KeyNameLength = sizeof(RootKeyName);
    if (DevInstKeyType & PLUGPLAY_REGKEY_CURRENT_HWPROFILE)
        KeyNameLength += sizeof(ProfileKeyName) - sizeof(UNICODE_NULL);
    if (DevInstKeyType & PLUGPLAY_REGKEY_DRIVER)
    {
        KeyNameLength += sizeof(ClassKeyName) - sizeof(UNICODE_NULL);
        Status = IoGetDeviceProperty(DeviceObject, DevicePropertyDriverKeyName,
                                     0, NULL, &DriverKeyLength);
        if (Status != STATUS_BUFFER_TOO_SMALL)
            return Status;
        KeyNameLength += DriverKeyLength;
    }
    else
    {
        KeyNameLength += sizeof(EnumKeyName) - sizeof(UNICODE_NULL) +
                         DeviceNode->InstancePath.Length;
    }

    /*
     * Now allocate the buffer for the key name...
     */

    KeyNameBuffer = ExAllocatePool(PagedPool, KeyNameLength);
    if (KeyNameBuffer == NULL)
        return STATUS_INSUFFICIENT_RESOURCES;

    KeyName.Length = 0;
    KeyName.MaximumLength = (USHORT)KeyNameLength;
    KeyName.Buffer = KeyNameBuffer;

    /*
     * ...and build the key name.
     */

    KeyName.Length += sizeof(RootKeyName) - sizeof(UNICODE_NULL);
    RtlCopyMemory(KeyNameBuffer, RootKeyName, KeyName.Length);

    if (DevInstKeyType & PLUGPLAY_REGKEY_CURRENT_HWPROFILE)
        RtlAppendUnicodeToString(&KeyName, ProfileKeyName);

    if (DevInstKeyType & PLUGPLAY_REGKEY_DRIVER)
    {
        RtlAppendUnicodeToString(&KeyName, ClassKeyName);
        Status = IoGetDeviceProperty(DeviceObject, DevicePropertyDriverKeyName,
                                     DriverKeyLength, KeyNameBuffer +
                                     (KeyName.Length / sizeof(WCHAR)),
                                     &DriverKeyLength);
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("Call to IoGetDeviceProperty() failed with Status 0x%08lx\n", Status);
            ExFreePool(KeyNameBuffer);
            return Status;
        }
        KeyName.Length += (USHORT)DriverKeyLength - sizeof(UNICODE_NULL);
    }
    else
    {
        RtlAppendUnicodeToString(&KeyName, EnumKeyName);
        Status = RtlAppendUnicodeStringToString(&KeyName, &DeviceNode->InstancePath);
        if (DeviceNode->InstancePath.Length == 0)
        {
            ExFreePool(KeyNameBuffer);
            return Status;
        }
    }

    /*
     * Open the base key.
     */
    Status = IopOpenRegistryKeyEx(DevInstRegKey, NULL, &KeyName, DesiredAccess);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("IoOpenDeviceRegistryKey(%wZ): Base key doesn't exist, exiting... (Status 0x%08lx)\n", &KeyName, Status);
        ExFreePool(KeyNameBuffer);
        return Status;
    }
    ExFreePool(KeyNameBuffer);

    /*
     * For driver key we're done now.
     */

    if (DevInstKeyType & PLUGPLAY_REGKEY_DRIVER)
        return Status;

    /*
     * Let's go further. For device key we must open "Device Parameters"
     * subkey and create it if it doesn't exist yet.
     */

    RtlInitUnicodeString(&KeyName, DeviceParametersKeyName);
    InitializeObjectAttributes(&ObjectAttributes,
                               &KeyName,
                               OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                               *DevInstRegKey,
                               NULL);
    Status = ZwCreateKey(DevInstRegKey,
                         DesiredAccess,
                         &ObjectAttributes,
                         0,
                         NULL,
                         REG_OPTION_NON_VOLATILE,
                         NULL);
    ZwClose(ObjectAttributes.RootDirectory);

    return Status;
}

/*
 * @implemented
 */
VOID
NTAPI
IoInvalidateDeviceRelations(
    IN PDEVICE_OBJECT DeviceObject,
    IN DEVICE_RELATION_TYPE Type)
{
    if (!IopIsValidPhysicalDeviceObject(DeviceObject))
    {
        KeBugCheckEx(PNP_DETECTED_FATAL_ERROR, 0x2, (ULONG_PTR)DeviceObject, 0, 0);
    }

    switch (Type)
    {
        case BusRelations:
            /* Enumerate the device */
            PiQueueDeviceAction(DeviceObject, PiActionEnumDeviceTree, NULL, NULL);
            break;
        default:
            /* Everything else is not implemented */
            break;
    }
}

/*
 * @implemented
 */
NTSTATUS
NTAPI
IoSynchronousInvalidateDeviceRelations(
    IN PDEVICE_OBJECT DeviceObject,
    IN DEVICE_RELATION_TYPE Type)
{
    PAGED_CODE();

    if (!IopIsValidPhysicalDeviceObject(DeviceObject))
    {
        KeBugCheckEx(PNP_DETECTED_FATAL_ERROR, 0x2, (ULONG_PTR)DeviceObject, 0, 0);
    }

    switch (Type)
    {
        case BusRelations:
            /* Enumerate the device */
            return PiPerformSyncDeviceAction(DeviceObject, PiActionEnumDeviceTree);
        case PowerRelations:
             /* Not handled yet */
             return STATUS_NOT_IMPLEMENTED;
        case TargetDeviceRelation:
            /* Nothing to do */
            return STATUS_SUCCESS;
        default:
            /* Ejection relations are not supported */
            return STATUS_NOT_SUPPORTED;
    }
}

/*
 * @implemented
 */
BOOLEAN
NTAPI
IoTranslateBusAddress(IN INTERFACE_TYPE InterfaceType,
                      IN ULONG BusNumber,
                      IN PHYSICAL_ADDRESS BusAddress,
                      IN OUT PULONG AddressSpace,
                      OUT PPHYSICAL_ADDRESS TranslatedAddress)
{
    /* FIXME: Notify the resource arbiter */

    return HalTranslateBusAddress(InterfaceType,
                                  BusNumber,
                                  BusAddress,
                                  AddressSpace,
                                  TranslatedAddress);
}