root60931
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阅读:10175回复:7

PCI\<device-ID>\<instance-specific-ID>,请问instance-specific-ID是什么意思?

楼主#
更多 发布于:2005-08-05 11:18
  我在ddk中看到Device Instance IDs是由<device-ID>\<instance-specific-ID>这种形式组成的,
在我机器中可以找到usb控制器的键值如下
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\PCI\VEN_8086&DEV_24C2&SUBSYS_3080103C&REV_03\3&61aaa01&0&E8
请问3&61aaa01&0&E8,也就是instance-specific-ID是什么意思,系统是怎么得到的?
好好学习,天天向上! root60931@gmail.com
root60931
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沙发#
发布于:2005-08-06 08:20
自己顶
好好学习,天天向上! root60931@gmail.com
seahawk
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板凳#
发布于:2005-08-06 21:03
同感,帮你顶!
傍海渔村酣睡足 斜阳一脉洒千山 鲲鹏不待风潮起 万古江山多寂寥
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地板#
发布于:2008-08-04 16:19
2002年
2005年
2008年

每三年顶一次,希望楼上的可以解决
tiamo
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地下室#
发布于:2008-08-06 13:24
仍然未解决么?
先上代码....

//********************************************************************
//    created:    23:7:2008   19:29
//    file:        pci.id.cpp
//    author:        tiamo
//    purpose:    device id
//********************************************************************

#include "stdafx.h"

#pragma alloc_text(PAGE,PciGetDeviceDescriptionMessage)
#pragma alloc_text(PAGE,PciQueryId)
#pragma alloc_text(PAGE,PciQueryDeviceText)

//
// id buffer
//
typedef struct _PCI_ID_BUFFER
{
    //
    // count
    //
    ULONG                                                Count;

    //
    // ansi string
    //
    ANSI_STRING                                            AnsiString[8];

    //
    // unicode string size
    //
    USHORT                                                UnicodeStringSize[8];

    //
    // total length
    //
    USHORT                                                TotalLength;

    //
    // buffer
    //
    PCHAR                                                CurrentBuffer;

    //
    // storage
    //
    CHAR                                                StorageBuffer[0x100];
}PCI_ID_BUFFER,*PPCI_ID_BUFFER;

//
// query id
//
NTSTATUS PciQueryId(__in PPCI_PDO_EXTENSION PdoExt,__in BUS_QUERY_ID_TYPE Type,__out PWCHAR* IdBuffer)
{
    PAGED_CODE();

    static CHAR Null[2]                                    = {0};
    NTSTATUS Status                                        = STATUS_SUCCESS;
    *IdBuffer                                            = 0;
    PWCHAR Buffer                                        = 0;
    ULONG SubSystemVendorId                                = (PdoExt->SubSystemId << 16) | PdoExt->SubVendorId;
    PCI_ID_BUFFER PciIdBuffer;

    __try
    {
        __try
        {
            if(Type < BusQueryDeviceID || Type > BusQueryInstanceID)
                try_leave(Status = STATUS_NOT_SUPPORTED);

            if(Type == BusQueryInstanceID)
            {
                PciIdPrintf(&PciIdBuffer,Null);

                PciIdPrintfAppend(&PciIdBuffer,"%02X",(PdoExt->Slot.u.bits.DeviceNumber << 3) | PdoExt->Slot.u.bits.FunctionNumber);

                PPCI_FDO_EXTENSION FdoExt                = PdoExt->ParentFdoExtension;
                while(FdoExt != FdoExt->BusRootFdoExtension)
                {
                    PCI_SLOT_NUMBER Slot                = static_cast<PPCI_PDO_EXTENSION>(FdoExt->PhysicalDeviceObject->DeviceExtension)->Slot;
                    PciIdPrintfAppend(&PciIdBuffer,"%02X",(Slot.u.bits.DeviceNumber << 3) | PdoExt->Slot.u.bits.FunctionNumber);

                    FdoExt                                = static_cast<PPCI_PDO_EXTENSION>(FdoExt->PhysicalDeviceObject->DeviceExtension)->ParentFdoExtension;
                }
                try_leave(NOTHING);
            }

            if(Type == BusQueryDeviceID || Type == BusQueryHardwareIDs)
            {
                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X&DEV_%04X&SUBSYS_%08X&REV_%02X",PdoExt->VendorId,PdoExt->DeviceId,SubSystemVendorId,PdoExt->RevisionId);

                if(Type == BusQueryDeviceID)
                    try_leave(NOTHING);

                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X&DEV_%04X&SUBSYS_%08X",PdoExt->VendorId,PdoExt->DeviceId,SubSystemVendorId);
            }

            if((Type == BusQueryHardwareIDs && !SubSystemVendorId) || (SubSystemVendorId && Type == BusQueryCompatibleIDs))
            {
                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X&DEV_%04X&REV_%02X",PdoExt->VendorId,PdoExt->DeviceId,PdoExt->RevisionId);

                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X&DEV_%04X",PdoExt->VendorId,PdoExt->DeviceId);
            }

            if(Type == BusQueryHardwareIDs)
            {
                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X&DEV_%04X&CC_%02X%02X%02X",PdoExt->VendorId,PdoExt->DeviceId,PdoExt->BaseClass,PdoExt->SubClass,PdoExt->ProgIf);

                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X&DEV_%04X&CC_%02X%02X",PdoExt->VendorId,PdoExt->DeviceId,PdoExt->BaseClass,PdoExt->SubClass);
            }

            if(Type == BusQueryCompatibleIDs)
            {
                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X&CC_%02X%02X%02X",PdoExt->VendorId,PdoExt->BaseClass,PdoExt->SubClass,PdoExt->ProgIf);

                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X&CC_%02X%02X",PdoExt->VendorId,PdoExt->BaseClass,PdoExt->SubClass);

                PciIdPrintf(&PciIdBuffer,"PCI\\VEN_%04X",PdoExt->VendorId);

                PciIdPrintf(&PciIdBuffer,"PCI\\&CC_%02X%02X%02X",PdoExt->BaseClass,PdoExt->SubClass,PdoExt->ProgIf);

                PciIdPrintf(&PciIdBuffer,"PCI\\&CC_%02X%02X",PdoExt->BaseClass,PdoExt->SubClass);
            }

            //
            // append a null
            //
            PciIdPrintf(&PciIdBuffer,Null);
        }
        __finally
        {
        }

        if(!NT_SUCCESS(Status))
            try_leave(NOTHING);

        ASSERT(PciIdBuffer.Count);

        //
        // allocate buffer
        //
        Buffer                                            = static_cast<PWCHAR>(PciAllocateColdPoolWithTag(PagedPool,PciIdBuffer.TotalLength,'BicP'));
        if(!Buffer)
            try_leave(Status = STATUS_INSUFFICIENT_RESOURCES);

        //
        // convert to unicode
        //
        UNICODE_STRING String;
        String.Buffer                                    = Buffer;
        String.MaximumLength                            = PciIdBuffer.TotalLength;

        for(ULONG i = 0; i < PciIdBuffer.Count; i ++)
        {
            if(!NT_SUCCESS(RtlAnsiStringToUnicodeString(&String,&PciIdBuffer.AnsiString[i],FALSE)))
                try_leave(NOTHING);

            String.MaximumLength                        -= PciIdBuffer.UnicodeStringSize[i];
            String.Buffer                                += PciIdBuffer.UnicodeStringSize[i] / sizeof(WCHAR);
        }

        *IdBuffer                                        = Buffer;
    }
    __finally
    {
        if(!NT_SUCCESS(Status) || AbnormalTermination())
        {
            if(Buffer)
                ExFreePool(Buffer);
        }
    }

    return Status;
}

//
// query text
//
NTSTATUS PciQueryDeviceText(__in PPCI_PDO_EXTENSION PdoExt,__in DEVICE_TEXT_TYPE Type,__in LCID LocalId,__out PWCHAR* TextBuffer)
{
    PAGED_CODE();

    NTSTATUS Status                                        = STATUS_NOT_SUPPORTED;

    switch(Type)
    {
    case DeviceTextDescription:
        *TextBuffer                                        = PciGetDeviceDescriptionMessage(PdoExt->BaseClass,PdoExt->SubClass);
        Status                                            = *TextBuffer ? STATUS_SUCCESS : STATUS_NOT_SUPPORTED;
        break;

    case DeviceTextLocationInformation:
        {
            PWCHAR Format                                = 0;
            __try
            {
                Format                                    = PciGetDescriptionMessage(0x10000);
                if(!Format)
                    try_leave(Status = STATUS_NOT_SUPPORTED);

                ULONG Length                            = (wcslen(Format) + 7) * sizeof(WCHAR);

                PWCHAR Buffer                            = static_cast<PWCHAR>(PciAllocateColdPoolWithTag(PagedPool,Length,'BicP'));
                if(!Buffer)
                    try_leave(Status = STATUS_INSUFFICIENT_RESOURCES);

                RtlStringCchPrintfW(Buffer,Length / sizeof(WCHAR) - 1,Format,PdoExt->ParentFdoExtension->BaseBus,
                                    PdoExt->Slot.u.bits.DeviceNumber,PdoExt->Slot.u.bits.FunctionNumber);

                *TextBuffer                                = Buffer;
                Status                                    = STATUS_SUCCESS;
            }
            __finally
            {
                if(Format)
                    ExFreePool(Format);
            }
        }
        break;
    }

    return Status;
}

//
// get device description message
//
PWCHAR PciGetDeviceDescriptionMessage(__in UCHAR BaseClass,__in UCHAR SubClass)
{
    PAGED_CODE();
    
    USHORT Class                                        = (BaseClass << 8) | SubClass;

    PWCHAR Ret                                            = PciGetDescriptionMessage(Class);

    if(Ret)
        return Ret;

    Ret                                                    = static_cast<PWCHAR>(ExAllocatePoolWithTag(PagedPool,sizeof(L"PCI Device"),'BicP'));
    if(Ret)
        RtlCopyMemory(Ret,L"PCI Device",sizeof(L"PCI Device"));

    return Ret;
}

//
// get string from resource
//
PWCHAR PciGetDescriptionMessage(__in ULONG ResourceId)
{
    PMESSAGE_RESOURCE_ENTRY Entry                        = 0;
    if(!NT_SUCCESS(RtlFindMessage(PciDriverObject->DriverStart,0x0b,0x0,ResourceId,&Entry)))
        return 0;

    if(Entry->Flags & MESSAGE_RESOURCE_UNICODE)
    {
        ULONG Length                                    = Entry->Length - sizeof(MESSAGE_RESOURCE_ENTRY) - sizeof(WCHAR);
        PWCHAR Buffer                                    = Add2Ptr(Entry->Text,0,PWCHAR);
        if(!Buffer[Length / sizeof(WCHAR)])
            Length                                        -= sizeof(WCHAR);

        ASSERT(Length > 1);
        ASSERT(Buffer[Length / sizeof(WCHAR)] == 0x000a);

        PWCHAR Ret                                        = static_cast<PWCHAR>(PciAllocateColdPoolWithTag(PagedPool,Length,'BicP'));
        if(Ret)
        {
            RtlCopyMemory(Ret,Buffer,Length);
            Ret[Length / sizeof(WCHAR)]                    = 0;
        }

        return Ret;
    }

    ANSI_STRING AnsiString;
    RtlInitAnsiString(&AnsiString,Add2Ptr(Entry->Text,0,PCHAR));

    AnsiString.Length                                    -= 2;

    UNICODE_STRING UnicodeString;
    RtlAnsiStringToUnicodeString(&UnicodeString,&AnsiString,TRUE);

    return UnicodeString.Buffer;
}

//
// init id buffer
//
VOID PciInitIdBuffer(__in PPCI_ID_BUFFER IdBuffer)
{
    PAGED_CODE();

    IdBuffer->Count                                        = 0;
    IdBuffer->TotalLength                                = 0;
    IdBuffer->CurrentBuffer                                = IdBuffer->StorageBuffer;
}

//
// id printf
//
VOID PciIdPrintf(__in PPCI_ID_BUFFER IdBuffer,__in PCHAR Format,...)
{
    PAGED_CODE();

    ASSERT(IdBuffer->Count < ARRAYSIZE(IdBuffer->AnsiString));

    ULONG Length                                        = IdBuffer->StorageBuffer + ARRAYSIZE(IdBuffer->StorageBuffer) - IdBuffer->CurrentBuffer;
    size_t LeftLength;

    va_list list;
    va_start(list,Format);
    RtlStringCchVPrintfExA(IdBuffer->CurrentBuffer,Length,0,&LeftLength,0,Format,list);
    va_end(list);

    Length                                                = static_cast<ULONG>(Length - LeftLength);
    IdBuffer->AnsiString[IdBuffer->Count].Buffer        = IdBuffer->CurrentBuffer;
    IdBuffer->AnsiString[IdBuffer->Count].Length        = static_cast<USHORT>(Length);
    IdBuffer->AnsiString[IdBuffer->Count].MaximumLength    = static_cast<USHORT>(Length + sizeof(CHAR));

    ULONG Size                                            = RtlAnsiStringToUnicodeSize(&IdBuffer->AnsiString[IdBuffer->Count]);
    IdBuffer->UnicodeStringSize[IdBuffer->Count]        = static_cast<USHORT>(Size);
    IdBuffer->TotalLength                                += static_cast<USHORT>(Size);
    IdBuffer->Count                                        += 1;
    IdBuffer->CurrentBuffer                                += Length + 1;
}

//
// append printf
//
VOID PciIdPrintfAppend(__in PPCI_ID_BUFFER IdBuffer,__in PCHAR Format,...)
{
    PAGED_CODE();

    ASSERT(IdBuffer->Count);

    ULONG Length                                        = IdBuffer->StorageBuffer + ARRAYSIZE(IdBuffer->StorageBuffer) - IdBuffer->CurrentBuffer + 1;
    size_t LeftLength;

    va_list list;
    va_start(list,Format);
    RtlStringCchVPrintfExA(IdBuffer->CurrentBuffer - 1,Length,0,&LeftLength,0,Format,list);
    va_end(list);

    Length                                                    = static_cast<ULONG>(Length - LeftLength);
    IdBuffer->AnsiString[IdBuffer->Count - 1].Length        += static_cast<USHORT>(Length);
    IdBuffer->AnsiString[IdBuffer->Count - 1].MaximumLength    += static_cast<USHORT>(Length);

    ULONG Size                                            = RtlAnsiStringToUnicodeSize(&IdBuffer->AnsiString[IdBuffer->Count]);
    IdBuffer->UnicodeStringSize[IdBuffer->Count - 1]    = static_cast<USHORT>(Size);
    IdBuffer->TotalLength                                += static_cast<USHORT>(Size);
    IdBuffer->CurrentBuffer                                += Length;
}


NTSTATUS
IopMakeGloballyUniqueId(
    IN PDEVICE_OBJECT   DeviceObject,
    IN PWCHAR           UniqueId,
    OUT PWCHAR         *GloballyUniqueId
    )
{
    NTSTATUS status;
    ULONG length;
    PWSTR id, Prefix = NULL;
    HANDLE enumKey;
    HANDLE instanceKey;
    UCHAR keyBuffer[FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data) + sizeof(ULONG)];
    PKEY_VALUE_PARTIAL_INFORMATION keyValue, stringValueBuffer = NULL;
    UNICODE_STRING valueName;
    ULONG uniqueIdValue, Hash, hashInstance;
    PDEVICE_NODE parentNode;

    PAGED_CODE();

    //
    // We need to build an instance id to uniquely identify this
    // device.  We will accomplish this by producing a prefix that will be
    // prepended to the non-unique device id supplied.
    //

    //
    // To 'unique-ify' the child's instance ID, we will retrieve
    // the unique "UniqueParentID" number that has been assigned
    // to the parent and use it to construct a prefix.  This is
    // the legacy mechanism supported here so that existing device
    // settings are not lost on upgrade.
    //

    KeEnterCriticalRegion();
    ExAcquireResourceShared(&PpRegistryDeviceResource, TRUE);

    parentNode = ((PDEVICE_NODE)DeviceObject->DeviceObjectExtension->DeviceNode)->Parent;

    status = IopOpenRegistryKeyEx( &enumKey,
                                   NULL,
                                   &CmRegistryMachineSystemCurrentControlSetEnumName,
                                   KEY_READ | KEY_WRITE
                                   );

    if (!NT_SUCCESS(status)) {
        DbgPrint("IopQueryUniqueId:\tUnable to open HKLM\\SYSTEM\\CCS\\ENUM (status %08lx)\n",
                 status
                );
        goto clean0;
    }

    //
    // Open the instance key for this devnode
    //
    status = IopOpenRegistryKeyEx( &instanceKey,
                                   enumKey,
                                   &parentNode->InstancePath,
                                   KEY_READ | KEY_WRITE
                                   );

    if (!NT_SUCCESS(status)) {
        DbgPrint("IopQueryUniqueId:\tUnable to open registry key for %wZ (status %08lx)\n",
                 &parentNode->InstancePath,
                 status
                );
        goto clean1;
    }

    //
    // Attempt to retrieve the "UniqueParentID" value from the device
    // instance key.
    //
    keyValue = (PKEY_VALUE_PARTIAL_INFORMATION)keyBuffer;
    PiWstrToUnicodeString(&valueName, REGSTR_VALUE_UNIQUE_PARENT_ID);

    status = ZwQueryValueKey(instanceKey,
                             &valueName,
                             KeyValuePartialInformation,
                             keyValue,
                             sizeof(keyBuffer),
                             &length
                             );

    if (NT_SUCCESS(status)) {
        ASSERT(keyValue->Type == REG_DWORD);
        ASSERT(keyValue->DataLength == sizeof(ULONG));
        if ((keyValue->Type != REG_DWORD) ||
            (keyValue->DataLength != sizeof(ULONG))) {
            status = STATUS_INVALID_PARAMETER;
            goto clean2;
        }

        uniqueIdValue = *(PULONG)(keyValue->Data);

        //
        // OK, we have a unique parent ID number to prefix to the
        // instance ID.
        Prefix = (PWSTR)ExAllocatePool(PagedPool, 9 * sizeof(WCHAR));
        if (!Prefix) {
            status = STATUS_INSUFFICIENT_RESOURCES;
            goto clean2;
        }
        swprintf(Prefix, L"%x", uniqueIdValue);
    } else {

        //
        // This is the current mechanism for finding existing
        // device instance prefixes and calculating new ones if
        // required.
        //

        //
        // Attempt to retrieve the "ParentIdPrefix" value from the device
        // instance key.
        //

        PiWstrToUnicodeString(&valueName, REGSTR_VALUE_PARENT_ID_PREFIX);
        length = (MAX_PARENT_PREFIX + 1) * sizeof(WCHAR) +
            FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data);
        stringValueBuffer = ExAllocatePool(PagedPool,
                                           length);
        if (stringValueBuffer) {
            status = ZwQueryValueKey(instanceKey,
                                     &valueName,
                                     KeyValuePartialInformation,
                                     stringValueBuffer,
                                     length,
                                     &length);
        }
        else {
            status = STATUS_INSUFFICIENT_RESOURCES;
            goto clean2;
        }

        if (NT_SUCCESS(status)) {

            ASSERT(stringValueBuffer->Type == REG_SZ);
            if (stringValueBuffer->Type != REG_SZ) {
                status = STATUS_INVALID_PARAMETER;
                goto clean2;
            }

            //
            // Parent has already been assigned a "ParentIdPrefix".
            //

            Prefix = (PWSTR) ExAllocatePool(PagedPool,
                                            stringValueBuffer->DataLength);
            if (!Prefix)
            {
                status = STATUS_INSUFFICIENT_RESOURCES;
                goto clean2;
            }
            wcscpy(Prefix, (PWSTR) stringValueBuffer->Data);
        }
        else
        {
            //
            // Parent has not been assigned a "ParentIdPrefix".
            // Compute the prefix:
            //    * Compute Hash
            //    * Look for value of the form:
            //        NextParentId.<level>.<hash>:REG_DWORD: <NextInstance>
            //      under CCS\Enum.  If not present, create it.
            //    * Assign the new "ParentIdPrefix" which will be of
            //      of the form:
            //        <level>&<hash>&<instance>
            //

            // Allocate a buffer once for the NextParentId... value
            // and for the prefix.
            length = max(wcslen(REGSTR_VALUE_NEXT_PARENT_ID) + 2 + 8 + 8,
                         MAX_PARENT_PREFIX) + 1;

            // Device instances are case in-sensitive.  Upcase before
            // performing hash to ensure that the hash is case-insensitve.
            status = RtlUpcaseUnicodeString(&valueName,
                                            &parentNode->InstancePath,
                                            TRUE);
            if (!NT_SUCCESS(status))
            {
                goto clean2;
            }
            HASH_UNICODE_STRING(&valueName, &Hash);
            RtlFreeUnicodeString(&valueName);

            Prefix = (PWSTR) ExAllocatePool(PagedPool,
                                            length * sizeof(WCHAR));
            if (!Prefix) {
                status = STATUS_INSUFFICIENT_RESOURCES;
                goto clean2;
            }

            // Check for existence of "NextParentId...." value and update.
            swprintf(Prefix, L"%s.%x.%x", REGSTR_VALUE_NEXT_PARENT_ID,
                     Hash, parentNode->Level);
            RtlInitUnicodeString(&valueName, Prefix);
            keyValue = (PKEY_VALUE_PARTIAL_INFORMATION)keyBuffer;
            status = ZwQueryValueKey(enumKey,
                                     &valueName,
                                     KeyValuePartialInformation,
                                     keyValue,
                                     sizeof(keyBuffer),
                                     &length
                                     );
            if (NT_SUCCESS(status) && (keyValue->Type == REG_DWORD) &&
                (keyValue->DataLength == sizeof(ULONG))) {
                hashInstance = *(PULONG)(keyValue->Data);
            }
            else {
                hashInstance = 0;
            }

            hashInstance++;

            status = ZwSetValueKey(enumKey,
                                   &valueName,
                                   TITLE_INDEX_VALUE,
                                   REG_DWORD,
                                   &hashInstance,
                                   sizeof(hashInstance)
                                   );

            if (!NT_SUCCESS(status)) {
                goto clean2;
            }

            hashInstance--;

            // Create actual ParentIdPrefix string
            PiWstrToUnicodeString(&valueName, REGSTR_VALUE_PARENT_ID_PREFIX);
            length = swprintf(Prefix, L"%x&%x&%x", parentNode->Level,
                     Hash, hashInstance) + 1;
            status = ZwSetValueKey(instanceKey,
                                   &valueName,
                                   TITLE_INDEX_VALUE,
                                   REG_SZ,
                                   Prefix,
                                   length * sizeof(WCHAR)
                                   );
            if (!NT_SUCCESS(status))
            {
                goto clean2;
            }
        }
    }

    // Construct the instance id from the non-unique id (if any)
    // provided by the child and the prefix we've constructed.
    length = wcslen(Prefix) + (UniqueId ? wcslen(UniqueId) : 0) + 2;
    id = (PWSTR)ExAllocatePool(PagedPool, length * sizeof(WCHAR));
    if (!id) {
        status = STATUS_INSUFFICIENT_RESOURCES;
    } else if (UniqueId) {
        swprintf(id, L"%s&%s", Prefix, UniqueId);
    } else {
        wcscpy(id, Prefix);
    }

clean2:
    ZwClose(instanceKey);

clean1:
    ZwClose(enumKey);

clean0:
    ExReleaseResource(&PpRegistryDeviceResource);
    KeLeaveCriticalRegion();

    if (stringValueBuffer) {
        ExFreePool(stringValueBuffer);
    }

    if (Prefix) {
        ExFreePool(Prefix);
    }

    *GloballyUniqueId = id;
    return status;
}
tiamo
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5楼#
发布于:2008-08-06 13:38
Re:PCI\&lt;device-ID&gt;\&lt;instance-specific-ID&gt;,请问i
你的这个例子前面VEN_什么什么的很容易理解
他就是的device id.他是怎么来的看上面的PciQueryId里面关于device id的处理

后面这个3&61aaa01&0&E8分成4个部分

第一个3表示这个device在整个device tree里面的level.他在第三级
root是0,root下面是acpi再下面是pci root bridge.这个设备就直接在root bridge下面

第二个是个hash值.他是这个设备的parent 设备的instance path大写以后计算出来的hash值
instance path是从current control set下面的enum算起(不包含enum)

第三个是hash instance.你很少有看到这个值不为0的
他表示为同一个parent计算上面这个hash的次数 - 1.通常都只是计算一次.计算以后就会保存下面.下一次就直接读取了而不会再重新计算

最后一个就是由bus驱动为他们的pdo返回的instance id了

pci的话看上面PciQueryId的代码
就是从当前设备开始依次回溯他root bridge然后把他们的dev,fun合起来..

希望有帮助....

P.S.08年力作..windows xp sp2 checked build pci.sys全部逆向完成并已经转换成c代码
近日公布...敬请期待..
liuyan1
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6楼#
发布于:2009-03-11 10:19
强帖要留名,顶tiamo 顶楼主 !!!
楼上的客,楼下的客,听我老坎说明白,要苛屎有草纸,不要扯我的麦席子,要苛尿有夜壶,不要在床上划地图。
root60931
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发布于:2023-04-21 16:42
感谢tiamo大神, 18年了,终于搞明白了!!!
好好学习,天天向上! root60931@gmail.com
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