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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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45
xtoskrnl/mm/amd64/pte.cc
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@@ -176,6 +176,7 @@ MM::Pte::MapP5E(IN PVOID StartAddress,
IN PMMP5E TemplateP5e)
{
PMMP5E EndSpace, PointerP5e;
PFN_NUMBER PageFrameNumber;
/* Get P5E addresses */
PointerP5e = MM::Paging::GetP5eAddress(StartAddress);
@@ -187,8 +188,18 @@ MM::Pte::MapP5E(IN PVOID StartAddress,
/* Check if P5E is already mapped */
if(!MM::Paging::PteValid(PointerP5e))
{
/* Map P5E */
MM::Paging::SetPte(TemplateP5e, 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(TemplateP5e, PageFrameNumber, 0);
*PointerP5e = *TemplateP5e;
/* Clear the page table */
@@ -223,6 +234,7 @@ MM::Pte::MapPPE(IN PVOID StartAddress,
IN PMMPPE TemplatePpe)
{
PMMPPE EndSpace, PointerPpe;
PFN_NUMBER PageFrameNumber;
/* Get PPE addresses */
PointerPpe = MM::Paging::GetPpeAddress(StartAddress);
@@ -234,8 +246,18 @@ MM::Pte::MapPPE(IN PVOID StartAddress,
/* Check if PPE is already mapped */
if(!MM::Paging::PteValid(PointerPpe))
{
/* Map PPE */
MM::Paging::SetPte(TemplatePpe, 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(TemplatePpe, PageFrameNumber, 0);
*PointerPpe = *TemplatePpe;
/* Clear the page table */
@@ -270,6 +292,7 @@ MM::Pte::MapPXE(IN PVOID StartAddress,
IN PMMPXE TemplatePxe)
{
PMMPXE EndSpace, PointerPxe;
PFN_NUMBER PageFrameNumber;
/* Get PXE addresses */
PointerPxe = MM::Paging::GetPxeAddress(StartAddress);
@@ -281,8 +304,18 @@ MM::Pte::MapPXE(IN PVOID StartAddress,
/* Check if PTE is already mapped */
if(!MM::Paging::PteValid(PointerPxe))
{
/* Map PTE */
MM::Paging::SetPte(TemplatePxe, 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(TemplatePxe, PageFrameNumber, 0);
*PointerPxe = *TemplatePxe;
/* Clear the page table */