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- Add another helper: MiGetPfnEntryIndex. This returns the page frame number (PFN) for a given MMPFN entry.

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- Also add MiPteToAddress to complement MiAddressToPte. This returns the VA for a given PTE. Bonus points if you can figure out the bit magic.


svn path=/trunk/; revision=41507
This commit is contained in:
ReactOS Portable Systems Group 2009-06-21 04:28:31 +00:00
parent 6464056a16
commit 7afb3ea904
2 changed files with 15 additions and 0 deletions
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5
reactos/ntoskrnl/include/internal/i386/mm.h
View file

@ -23,6 +23,11 @@ PULONG MmGetPageDirectory(VOID);
#define MiAddressToPteOffset(x) \
((((ULONG)(x)) << 10) >> 22)
//
// Convert a PTE into a corresponding address
//
#define MiPteToAddress(PTE) ((PVOID)((ULONG)(PTE) << 10))
#define ADDR_TO_PAGE_TABLE(v) (((ULONG)(v)) / (1024 * PAGE_SIZE))
#define ADDR_TO_PDE_OFFSET(v) ((((ULONG)(v)) / (1024 * PAGE_SIZE)))
#define ADDR_TO_PTE_OFFSET(v) ((((ULONG)(v)) % (1024 * PAGE_SIZE)) / PAGE_SIZE)

10
reactos/ntoskrnl/include/internal/mm.h
View file

@ -1050,6 +1050,16 @@ MiGetPfnEntry(IN PFN_TYPE Pfn)
return Page;
};
FORCEINLINE
PFN_NUMBER
MiGetPfnEntryIndex(IN PMMPFN Pfn1)
{
//
// This will return the Page Frame Number (PFN) from the MMPFN
//
return Pfn1 - MmPfnDatabase;
}
PFN_TYPE
NTAPI
MmGetLRUNextUserPage(PFN_TYPE PreviousPage);