关于PCI寄存器读写问题 PCI_COMMON_CONFIG。

在NT下，可以直接用HalGetBusData, HalGetBusDataByOffset, HalSetBusData, HalSetBusDataByOffset访问PCI寄存器，但是Win2k以后他把这些Routine放到PCI相关的driver里面了，所以要自己写代码来发IRP_MN_READ_CONFIG 或者IRP_MN_WRITE_CONFIG的IRP。
我看到微软的网站有这么个Function来替代
NTSTATUS
ReadWriteConfigSpace(
IN PDEVICE_OBJECT DeviceObject,
IN ULONG ReadOrWrite, // 0 for read 1 for write
IN PVOID Buffer,
IN ULONG Offset,
IN ULONG Length
)
{
KEVENT event;
NTSTATUS status;
PIRP irp;
IO_STATUS_BLOCK ioStatusBlock;
PIO_STACK_LOCATION irpStack;
PDEVICE_OBJECT targetObject;
PAGED_CODE();
KeInitializeEvent( &event, NotificationEvent, FALSE );
targetObject = IoGetAttachedDeviceReference( DeviceObject );
irp = IoBuildSynchronousFsdRequest( IRP_MJ_PNP,
targetObject,
NULL,
0,
NULL,
&event,
&ioStatusBlock );
if (irp == NULL)
status = STATUS_INSUFFICIENT_RESOURCES;
goto End;
}
irpStack = IoGetNextIrpStackLocation( irp );
if (ReadOrWrite == 0)
irpStack->MinorFunction = IRP_MN_READ_CONFIG;
}else
irpStack->MinorFunction = IRP_MN_WRITE_CONFIG;
}
irpStack->Parameters.ReadWriteConfig.WhichSpace = PCI_WHICHSPACE_CONFIG;
irpStack->Parameters.ReadWriteConfig.Buffer = Buffer;
irpStack->Parameters.ReadWriteConfig.Offset = Offset;
irpStack->Parameters.ReadWriteConfig.Length = Length;
//
// Initialize the status to error in case the bus driver does not
// set it correctly.
//
irp->IoStatus.Status = STATUS_NOT_SUPPORTED ;
status = IoCallDriver( targetObject, irp );
if (status == STATUS_PENDING)
KeWaitForSingleObject( &event, Executive, KernelMode, FALSE, NULL );
status = ioStatusBlock.Status;
}
End:
//
// Done with reference
//
ObDereferenceObject( targetObject );
return status;
}

但是它里面的Buffer指的是什么？是指PCI_COMMON_CONFIG吗？
但是PCI_COMMON_CONFIG这个结构没有SlotNumber和BusNumber成员。
怎样来填充这个Buffer？
那位高人知道？请指点。谢谢

各位中秋节快乐。

可以自己写个小的汇编程序读配置信息！！

谢谢各位，我自己搞定了。