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[NTOS:Mm] Add PFN ShareCount handling to old Mm

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This commit is contained in:
Timo Kreuzer 2023-04-10 22:14:23 +03:00
parent 73de609917
commit 80dd9f5a90
1 changed files with 20 additions and 2 deletions
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22
ntoskrnl/mm/i386/page.c
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@ -325,7 +325,18 @@ MmDeleteVirtualMappingEx(
if (!IsPhysical && OldPte.u.Hard.Valid)
{
// TODO: Handle PFN ShareCount
PMMPFN Pfn1;
KIRQL OldIrql;
OldIrql = MiAcquirePfnLock();
Pfn1 = &MmPfnDatabase[OldPte.u.Hard.PageFrameNumber];
ASSERT(Pfn1->u3.e1.PageLocation == ActiveAndValid);
ASSERT(Pfn1->u2.ShareCount > 0);
if (--Pfn1->u2.ShareCount == 0)
{
Pfn1->u3.e1.PageLocation = TransitionPage;
}
MiReleasePfnLock(OldIrql);
}
MiUnlockProcessWorkingSetUnsafe(Process, PsGetCurrentThread());
@ -685,7 +696,14 @@ MmCreateVirtualMappingUnsafeEx(
if (!IsPhysical)
{
// TODO: Handle PFN ShareCount
PMMPFN Pfn1;
KIRQL OldIrql;
OldIrql = MiAcquirePfnLock();
Pfn1 = &MmPfnDatabase[TempPte.u.Hard.PageFrameNumber];
Pfn1->u2.ShareCount++;
Pfn1->u3.e1.PageLocation = ActiveAndValid;
MiReleasePfnLock(OldIrql);
}
/* We don't need to flush the TLB here because it only caches valid translations