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Achilleas Anagnostopoulos 76532089c5 Define PageDirectoryTable and helpers that support inactive tables

The Map/Unmap methods of PageDirectoryTable operate similar to the
global Map/Unmap functions. While the global functions work with the
currently active PDT, the PageDirectoryTable methods can also
work with inactive page tables by temporarily modifying the recursive
mapping of the active PDT to point to the inactive PDT frame before
delegating the mapping/unmapping to the global Map/Unmap functions.

2017-06-06 19:35:07 +01:00