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看了下源码，自己回答一下吧
PKPRCB
KiInitProcessorState(
PKPROCESSOR_STATE pProcessorState,
PVOID PerProcessorAllocation,
ULONG NewProcessorNumber,
UCHAR NodeNumber,
ULONG IdtOffset,
ULONG GdtOffset,
PVOID *ppStack,
PVOID *ppDpcStack
);
里面，看到这个
KiCloneDescriptor (&Descriptor,
&pProcessorState->SpecialRegisters.Idtr,
Base + IdtOffset);
继续看下去
static VOID
KiCloneDescriptor (
IN PKDESCRIPTOR pSrcDescriptor,
IN PKDESCRIPTOR pDestDescriptor,
IN PVOID Base
)
/*++
Routine Description:
Makes a copy of the specified descriptor, and supplies a return
descriptor for the new copy
Arguments:
pSrcDescriptor - descriptor to clone
pDescDescriptor - the cloned descriptor
Base - Base memory for the new descriptor.
Return Value:
None.
--*/
{
ULONG Size;
Size = pSrcDescriptor->Limit + 1;
pDestDescriptor->Limit = (USHORT) Size -1;
pDestDescriptor->Base = (ULONG) Base;
RtlCopyMemory(Base, (PVOID)pSrcDescriptor->Base, Size);
}
也就是说，多核下面的IDTR是多份，但是ISR应该是一样的，连猜带摸，如果不对，跟帖纠正吧~~~
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