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Update PTE mapping to allocate from PFN database
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This commit is contained in:
Aiken Harris
2026-06-12 08:54:51 +02:00
parent 32f0b747a1
commit b0d2868f82
3 changed files with 68 additions and 14 deletions
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31
xtoskrnl/mm/pte.cc
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@@ -242,6 +242,7 @@ MM::Pte::MapPDE(IN PVOID StartAddress,
IN PMMPDE TemplatePde)
{
PMMPDE EndSpace, PointerPde;
PFN_NUMBER PageFrameNumber;
/* Get PDE addresses */
PointerPde = MM::Paging::GetPdeAddress(StartAddress);
@@ -253,8 +254,18 @@ MM::Pte::MapPDE(IN PVOID StartAddress,
/* Check if PDE is already mapped */
if(!MM::Paging::PteValid(PointerPde))
{
/* Map PDE */
MM::Paging::SetPte(TemplatePde, MM::Pfn::AllocateBootstrapPages(1), 0);
/* Attempt to allocate a physical page from the PFN database */
PageFrameNumber = MM::Pfn::AllocatePhysicalPage(0);
/* Check if the primary allocation failed */
if(!PageFrameNumber)
{
/* Allocate a physical page from the fallback allocator */
PageFrameNumber = MM::Pfn::AllocateBootstrapPages(1);
}
/* Update the template with new page frame and write the PTE */
MM::Paging::SetPte(TemplatePde, PageFrameNumber, 0);
MM::Paging::WritePte(PointerPde, *TemplatePde);
/* Clear the page table */
@@ -289,6 +300,7 @@ MM::Pte::MapPTE(IN PVOID StartAddress,
IN PMMPTE TemplatePte)
{
PMMPTE EndSpace, PointerPte;
PFN_NUMBER PageFrameNumber;
/* Get PTE addresses */
PointerPte = MM::Paging::GetPteAddress(StartAddress);
@@ -300,8 +312,18 @@ MM::Pte::MapPTE(IN PVOID StartAddress,
/* Check if PTE is already mapped */
if(!MM::Paging::PteValid(PointerPte))
{
/* Map PTE */
MM::Paging::SetPte(TemplatePte, MM::Pfn::AllocateBootstrapPages(1), 0);
/* Attempt to allocate a physical page from the PFN database */
PageFrameNumber = MM::Pfn::AllocatePhysicalPage(0);
/* Check if the primary allocation failed */
if(!PageFrameNumber)
{
/* Allocate a physical page from the fallback allocator */
PageFrameNumber = MM::Pfn::AllocateBootstrapPages(1);
}
/* Update the template with new page frame and write the PTE */
MM::Paging::SetPte(TemplatePte, PageFrameNumber, 0);
MM::Paging::WritePte(PointerPte, *TemplatePte);
/* Clear the page table */
@@ -313,7 +335,6 @@ MM::Pte::MapPTE(IN PVOID StartAddress,
}
}
/**
* Releases a block of system PTEs into a specified pool.
*