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Sir Richard
6086842a76
1) MiCheckVirtualAddress should be called *after* determining if the PTE is a Demand Zero PTE. This is because when memory is allocated with MEM_RESERVE, and then MEM_COMMIT is called later, the VAD does not have the MemCommit flag set to TRUE. As such, MiCheckVirtualAddress returns MM_NOACCESS for the VAD (even though one is found) and the demand zero fault results in an access violation. Double-checked with Windows and this is the right behavior. 2) MiCheckVirtualAddress now supports non-commited reserve VADs (ie: trying to access MEM_RESERVE memory). It used to ASSERT, now it returns MM_NOACCESS so an access violation is raised. Before change #1, this would also happen if MEM_COMMIT was later performed on the ranges, but this is now fixed. 3) When calling MiResolveDemandZeroFault, we should not make the PDE a demand zero PDE. This is senseless. The whole point is that the PDE does exist, and MiInitializePfn needs it to keep track of the page table allocation. Removed the nonsensical line of code which performed cleard the PDE during a demand-zero fault. I am able to boot to 3rd stage with these changes, so I have seen no regressions. Additionally, with these changes, the as-of-yet-uncommitted VAD-based Virtual Memory code completes 1st stage setup successfully, instead of instantly crashing on boot. svn path=/trunk/; revision=55894