how to get interrup vector (the number that is used to index the IDT)from an upper filter driver

Hi everyone,
I have a very urgent question about getting interrup vector from an
upper filter driver:
In my project, I need to know the interrup vector assigned to a
particular device (not for standard devices that have fixed interrupt
vector value). I know that usually the interrup vector value can be
obtained in the underlying function driver (usually for the paramters
passing to IoConnectInterrupt())through the following code:
pIrpStack->Parameters.StartDevice.AllocatedResourcesTranslated.>List[0].PartialResourceList.PartialDescriptors[0].u.Interrupt.Vector

But I don't have the source code for the underlying function driver so
I wrote a upper filter driver to do the same thing to get the value. I
don't know whether it is feasible or not. But when the above code was
executed in the upper filter driver, I got either blue screen or reboot.
I viewd the minidump file and got the error code is NTSTATUS C0000005,
which is probably access violation. I'm wondering whether upper filter
driver has the privelige to access hardware resouce descriptors. Or
anything wrong with it? If not, can anybody suggest a way to get the
interrupt vector for a particular device or any tools to get this
value?

BTW, I use Intel CPU and running Windows XP.

Many many thanks in advance!!


qqmichelle

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