编写pci的WDM驱动应如何获得总线资源信息？

编写pci的WDM驱动应如何获得总线资源信息？
有的说用PCIReadConfig,但不知怎么用
也有的说可以用RetrieveResources,真不知该怎么办好！

在即插即用的IRP_MN_START_DEVICE处理程序中可从IRP中获得。

您能否具体解释一下IRP_MN_START_DEVICE的用法，我看书看得不太明白。不知您那有没有例子程序可以参考？
谢谢

点到为止，别的只能自己看书了。况且我不可能说的比书还好。

经典！
谢了

static NTSTATUS
PnpStartDevice(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
{
PIO_STACK_LOCATION  IrpStack;
PADAPTER Adapter = ( PADAPTER )DeviceObject->DeviceExtension;
PCM_RESOURCE_LIST   ResTranslated;
NTSTATUS            Status;

IrpStack  = IoGetCurrentIrpStackLocation(Irp);

if( IrpStack->Parameters.StartDevice.AllocatedResourcesTranslated )
ResTranslated = IrpStack->Parameters.StartDevice.AllocatedResourcesTranslated;
else
ResTranslated = NULL;

Status = StartDevice( Adapter, ResTranslated );

return CompleteIrp( Irp, Status, 0 );
}

/*************************************************************
*
* 名称：AdapterQueryHardwareResource
* 功能：获取硬件资源
* 参数：Adapter: 设备上下文
* pTranslatedResourceList: 经过转换后的硬件资源列表
* pUntranslatedResourceList: 原始的硬件资源列表
* 返回：成功返回TRUE, 失败返回FALSE
*
***************************************************************/
BOOL
AdapterQueryHardwareResource(
IN PADAPTER Adapter,
    IN PCM_RESOURCE_LIST    pTranslatedResourceList OPTIONAL,
    IN PCM_RESOURCE_LIST    pUntranslatedResourceList OPTIONAL
)
{
PCM_PARTIAL_RESOURCE_LIST pPatiresource; // 硬件资源信息
PCM_PARTIAL_RESOURCE_LIST pPatiunresource;// 未知的硬件资源信息
ULONG Count; // 枚举到的资源个数资源
UINT i; // 循环变量
PCM_PARTIAL_RESOURCE_DESCRIPTOR pResDes; // 具体的资源描述信息

// 判断硬件资源列表的有效性
if( !pTranslatedResourceList || !pUntranslatedResourceList )
return FALSE;

TRACE_IN( \"AdapterQueryHardwareResource\" );

// 获取指向资源信息的指针
pPatiresource = &( pTranslatedResourceList->List[0].PartialResourceList );
pPatiunresource = &( pUntranslatedResourceList->List[0].PartialResourceList );

// 获取硬件的原始资源
#if USE_INTERRUPT
Adapter->IrqLevel = -1L;
Adapter->IrqVector = -1L;
#endif

Count = pPatiresource->Count;
for( i = 0; i < Count; i++ )
{
pResDes = &pPatiresource->PartialDescriptors[ i ];
if( pResDes == NULL )
continue;

switch( pResDes->Type )
{
case CmResourceTypePort:
// 端口信息
Adapter->RawPortBase = pResDes->u.Port.Start;
Adapter->PortSpan = pResDes->u.Port.Length;
Adapter->isNeedMapIO = !( pResDes->Flags & CM_RESOURCE_PORT_IO );
TRACE1( \"The Port flags is 0x%x\", pResDes->Flags );
break;
#if USE_INTERRUPT
case CmResourceTypeInterrupt:
// 中断信息
Adapter->IrqVector = pResDes->u.Interrupt.Vector;
Adapter->IrqLevel = pResDes->u.Interrupt.Level;
Adapter->IrqType = pResDes->Flags;
Adapter->IrqAffinity = pResDes->u.Interrupt.Affinity;
Adapter->IrqShare = pResDes->ShareDisposition;
break;
#endif
default:
// 其它信息我们目前不需要
TRACE1( \"The resource tye( %d ) is not need\", pResDes->Type );
break;
}//switch

}// for i

// 检查获得的资源是否有效
do
{
// 端口
if( Adapter->RawPortBase.QuadPart == 0 || Adapter->PortSpan == 0 )
{
TRACE2( \"The IO Port( 0x%x, 0x%x ) is error\",
Adapter->RawPortBase.QuadPart, Adapter->PortSpan );

break;
}

#if USE_INTERRUPT
//中断
if( Adapter->IrqLevel == -1L || Adapter->IrqVector == -1L )
{
TRACE2( \"The IRQL( 0x%x, 0x%x ) is error\",
Adapter->IrqLevel, Adapter->IrqVector );

break;
}
#endif

// 映射端口，如果需要的话( 在alpha系统 )
if( Adapter->isNeedMapIO )
{
Adapter->PortBase = ( ULONG )MmMapIoSpace(
Adapter->RawPortBase, // 基地址
Adapter->PortSpan, // 范围
MmNonCached ); // 类型

TRACE0( \"The IO port is mapped\" );
}
else
{
// 已经被映射过了
Adapter->PortBase = (ULONG)Adapter->RawPortBase.QuadPart;
}

// 判断IO基地址的有效性
if( Adapter->PortBase == 0 )
{
TRACE0( \"The PortBase is error\" );
break;
}

TRACE1( \"The I/O PortBase is 0x%x\", Adapter->PortBase );
TRACE_OUT( \"AdapterQueryHardwareResource\", TRUE );
return TRUE;

}while( FALSE );

TRACE_OUT( \"AdapterQueryHardwareResource\", FALSE );
return FALSE;
}