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Refactor PFN initialization to ensure proper page table setup
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This commit is contained in:
Aiken Harris
2026-02-02 19:06:14 +01:00
parent 3d7f512377
commit eb0957dbd4
1 changed files with 23 additions and 26 deletions
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49
xtoskrnl/mm/amd64/pfn.cc
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@@ -24,7 +24,6 @@ MM::Pfn::InitializePfnDatabase(VOID)
PKERNEL_INITIALIZATION_BLOCK InitializationBlock; PKERNEL_INITIALIZATION_BLOCK InitializationBlock;
PLIST_ENTRY ListEntry; PLIST_ENTRY ListEntry;
PLOADER_MEMORY_DESCRIPTOR Descriptor; PLOADER_MEMORY_DESCRIPTOR Descriptor;
PFN_NUMBER BasePage, PageCount;
PUCHAR PfnDatabaseEnd; PUCHAR PfnDatabaseEnd;
PMMMEMORY_LAYOUT MemoryLayout; PMMMEMORY_LAYOUT MemoryLayout;
PMMPTE ValidPte; PMMPTE ValidPte;
@@ -67,43 +66,41 @@ MM::Pfn::InitializePfnDatabase(VOID)
continue; continue;
} }
/* Determine the physical page range to process */ /* Check if this is the modified free descriptor */
if(Descriptor == FreeDescriptor) if(Descriptor == FreeDescriptor)
{ {
BasePage = OriginalFreeDescriptor.BasePage; /* Switch to the original descriptor */
PageCount = OriginalFreeDescriptor.PageCount; Descriptor = &OriginalFreeDescriptor;
} }
else
/* Map PFN database entries for this range */
MM::Pte::MapPTE(&((PMMPFN)MemoryLayout->PfnDatabase)[Descriptor->BasePage],
(PUCHAR)&((PMMPFN)MemoryLayout->PfnDatabase)[Descriptor->BasePage + Descriptor->PageCount] - 1,
ValidPte);
/* Check if the free memory block that was split is being processed */
if(Descriptor == &OriginalFreeDescriptor)
{ {
BasePage = Descriptor->BasePage; /* Skip loop processing, free memory is initialized separately */
PageCount = Descriptor->PageCount; ListEntry = ListEntry->Flink;
continue;
} }
/* Map PFN database entries for this physical range */ /* Map PFN database entries for this physical range */
MM::Pte::MapPTE(&((PMMPFN)MemoryLayout->PfnDatabase)[BasePage], ProcessMemoryDescriptor(Descriptor->BasePage, Descriptor->PageCount, Descriptor->MemoryType);
(PUCHAR)&((PMMPFN)MemoryLayout->PfnDatabase)[BasePage + PageCount] - 1,
ValidPte);
/* Split PFN database allocation out of the free descriptor */
if(Descriptor == FreeDescriptor)
{
/* Initialize PFNs for the remaining free memory */
ProcessMemoryDescriptor(BasePage + MemoryLayout->PfnDatabaseSize,
PageCount - MemoryLayout->PfnDatabaseSize, LoaderFree);
/* Initialize PFNs for the physical pages backing the PFN database */
ProcessMemoryDescriptor(BasePage, MemoryLayout->PfnDatabaseSize, LoaderMemoryData);
}
else
{
/* Initialize PFNs for this memory range */
ProcessMemoryDescriptor(BasePage, PageCount, Descriptor->MemoryType);
}
/* Move to the next descriptor */ /* Move to the next descriptor */
ListEntry = ListEntry->Flink; ListEntry = ListEntry->Flink;
} }
/* Initialize PFNs for the free memory */
ProcessMemoryDescriptor(FreeDescriptor->BasePage, FreeDescriptor->PageCount, LoaderFree);
/* Initialize PFNs for the physical pages backing the PFN database */
ProcessMemoryDescriptor(OriginalFreeDescriptor.BasePage,
FreeDescriptor->BasePage - OriginalFreeDescriptor.BasePage,
LoaderMemoryData);
/* Restore original free descriptor */ /* Restore original free descriptor */
*FreeDescriptor = OriginalFreeDescriptor; *FreeDescriptor = OriginalFreeDescriptor;