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Calculate virtual address per page when initializing PFN entries
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This commit is contained in:
Aiken Harris
2026-03-13 19:35:29 +01:00
parent 5fe0740c2e
commit 7d2b41a044
1 changed files with 11 additions and 3 deletions
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14
xtoskrnl/mm/pfn.cc
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@@ -1034,7 +1034,7 @@ MM::Pfn::ProcessMemoryDescriptor(IN PFN_NUMBER BasePage,
IN PFN_NUMBER PageCount, IN PFN_NUMBER PageCount,
IN LOADER_MEMORY_TYPE MemoryType) IN LOADER_MEMORY_TYPE MemoryType)
{ {
PVOID VirtualRangeStart, VirtualRangeEnd; PVOID VirtualAddress, VirtualRangeStart, VirtualRangeEnd;
PFN_NUMBER PageNumber; PFN_NUMBER PageNumber;
PMMPDE PointerPde; PMMPDE PointerPde;
PMMPFN Pfn; PMMPFN Pfn;
@@ -1087,8 +1087,12 @@ MM::Pfn::ProcessMemoryDescriptor(IN PFN_NUMBER BasePage,
/* Ensure that the page is not already in-use */ /* Ensure that the page is not already in-use */
if(Pfn->u3.e2.ReferenceCount == 0) if(Pfn->u3.e2.ReferenceCount == 0)
{ {
/* Calculate the virtual address for this page */
VirtualAddress = (PVOID)(KSEG0_BASE + ((BasePage + PageNumber) << MM_PAGE_SHIFT));
PointerPde = MM::Paging::GetPdeAddress(VirtualAddress);
/* Initialize the PFN entry to represent a ROM page */ /* Initialize the PFN entry to represent a ROM page */
Pfn->PteAddress = MM::Paging::GetPteAddress(VirtualRangeStart); Pfn->PteAddress = MM::Paging::GetPteAddress(VirtualAddress);
Pfn->u1.Flink = 0; Pfn->u1.Flink = 0;
Pfn->u2.ShareCount = 0; Pfn->u2.ShareCount = 0;
Pfn->u3.e1.CacheAttribute = PfnCached; Pfn->u3.e1.CacheAttribute = PfnCached;
@@ -1117,8 +1121,12 @@ MM::Pfn::ProcessMemoryDescriptor(IN PFN_NUMBER BasePage,
/* Ensure that the page is not already in-use */ /* Ensure that the page is not already in-use */
if(Pfn->u3.e2.ReferenceCount == 0) if(Pfn->u3.e2.ReferenceCount == 0)
{ {
/* Calculate the virtual address for this page */
VirtualAddress = (PVOID)(KSEG0_BASE + ((BasePage + PageNumber) << MM_PAGE_SHIFT));
PointerPde = MM::Paging::GetPdeAddress(VirtualAddress);
/* Initialize the PFN entry to represent an in-use page and prevent it from being allocated */ /* Initialize the PFN entry to represent an in-use page and prevent it from being allocated */
Pfn->PteAddress = MM::Paging::GetPteAddress(VirtualRangeStart); Pfn->PteAddress = MM::Paging::GetPteAddress(VirtualAddress);
Pfn->u2.ShareCount++; Pfn->u2.ShareCount++;
Pfn->u3.e1.CacheAttribute = PfnCached; Pfn->u3.e1.CacheAttribute = PfnCached;
Pfn->u3.e1.PageLocation = ActiveAndValid; Pfn->u3.e1.PageLocation = ActiveAndValid;