On a x64 Windows 7 I want to get the limits of non paged pool. I know that _KDDEBUGGER_DATA64 structure has this information (fields like MmNonPagedPoolStart and MmNonPagedPoolEnd). On x86 systems this structure was obtained from KPCR.KdVersionBlock, but looking with WinDbg at KPCR's on x64 systems, KdVersionBlock seems to always be null.
Is there a way of getting this structure? Or another way of getting what I want? Maybe I'm not looking in the right place.