My rational guess is MmMapIoSpace will have to modify the system PTE/PDE to
accommodate the new PHYSICAL-to-VIRTUAL mapping. Grab the Pentium manual
from intel's website and take a look at how the P-to-V address translation
is done. It's a processor feature done in the MMU.

---------------------------------
Calvin Guan, Windows DDK MVP
Software Engineer, NT Driver
ATI Technologies Inc. www.ati.com

"Vijay" <vikramuv@blr.philips.com> wrote in message
news:11E8C99B-0653-4A9E-9D62-9D86D38AD431@microsoft.com...