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Refactor PFN linking logic
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This commit is contained in:
Aiken Harris
2026-02-25 19:27:53 +01:00
parent 44fa2ca13a
commit bfdb7bc476
3 changed files with 109 additions and 51 deletions
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149
xtoskrnl/mm/pfn.cc
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@@ -730,6 +730,84 @@ MM::Pfn::LinkPage(IN PMMPFNLIST ListHead,
}
}
/**
* Links a PFN entry to its corresponding PTE and ensures the page table that contains the PTE is resident in memory.
*
* @param PageFrameIndex
* Supplies the index into the PFN database for the page being initialized.
*
* @param PointerPte
* Supplies the pointer to the PTE which maps the physical page.
*
* @param Modified
* Supplies a flag indicating if the page's initial state is modified.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::Pfn::LinkPfn(IN PFN_NUMBER PageFrameIndex,
IN PMMPTE PointerPte,
IN BOOLEAN Modified)
{
PMMMEMORY_LAYOUT MemoryLayout;
XTSTATUS Status;
PMMPFN Pfn;
PMMPTE Pte;
/* Get the memory layout */
MemoryLayout = MM::Manager::GetMemoryLayout();
/* Point the PFN to its PTE */
Pfn = &((PMMPFN)MemoryLayout->PfnDatabase)[PageFrameIndex];
Pfn->PteAddress = PointerPte;
/* Check if the page is already mapped and in use */
if(MM::Paging::PteValid(PointerPte))
{
/* Clear the original PTE information */
MM::Paging::SetPte(&Pfn->OriginalPte, 0, MM_PTE_READWRITE | MM_PTE_CACHE_ENABLE);
}
else
{
/* Page is not resident, so save the PTE contents for later use */
Pfn->OriginalPte = *PointerPte;
}
/* Initialize the PFN database entry for this page */
Pfn->u2.ShareCount = 1;
Pfn->u3.e1.Modified = Modified;
Pfn->u3.e1.PageLocation = ActiveAndValid;
Pfn->u3.e2.ReferenceCount = 1;
/* Get the PDE that maps the page table containing this PTE */
Pte = MM::Paging::GetPteAddress(PointerPte);
if(!MM::Paging::PteValid(Pte))
{
/* Check if page table is resident */
Status = MM::PageFault::CheckPdeForPagedPool(PointerPte);
if(Status != STATUS_SUCCESS)
{
/* Could not make the page table resident, crash system */
KE::Crash::PanicEx(0x1,
(ULONG_PTR)0x61940,
(ULONG_PTR)PointerPte,
MM::Paging::GetPageFrameNumber(PointerPte),
(ULONG_PTR)MM::Paging::GetPteVirtualAddress(PointerPte));
}
}
/* Record the page frame of the page table itself */
PageFrameIndex = MM::Paging::GetPageFrameNumber(Pte);
Pfn->u4.PteFrame = PageFrameIndex;
/* Pin the page table in memory by incrementing its PFN share count */
Pfn = &((PMMPFN)MemoryLayout->PfnDatabase)[PageFrameIndex];
Pfn->u2.ShareCount++;
}
/**
* Initializes the PFN database entry for a physical page that is used as a page table.
*
@@ -788,8 +866,8 @@ MM::Pfn::LinkPfnForPageTable(IN PFN_NUMBER PageFrameIndex,
* @param PointerPte
* Supplies the pointer to the PTE which maps the physical page.
*
* @param Modified
* Supplies a flag indicating if the page's initial state is modified.
* @param ParentFrame
* Supplies the page frame number of the page table that contains the PTE.
*
* @return This routine does not return any value.
*
@@ -797,14 +875,12 @@ MM::Pfn::LinkPfnForPageTable(IN PFN_NUMBER PageFrameIndex,
*/
XTAPI
VOID
MM::Pfn::LinkPfnToPte(IN PFN_NUMBER PageFrameIndex,
IN PMMPTE PointerPte,
IN BOOLEAN Modified)
MM::Pfn::LinkPfnWithParent(IN PFN_NUMBER PageFrameIndex,
IN PMMPTE PointerPte,
IN PFN_NUMBER ParentFrame)
{
PMMMEMORY_LAYOUT MemoryLayout;
XTSTATUS Status;
PMMPFN Pfn;
PMMPTE Pte;
/* Get the memory layout */
MemoryLayout = MM::Manager::GetMemoryLayout();
@@ -813,48 +889,27 @@ MM::Pfn::LinkPfnToPte(IN PFN_NUMBER PageFrameIndex,
Pfn = &((PMMPFN)MemoryLayout->PfnDatabase)[PageFrameIndex];
Pfn->PteAddress = PointerPte;
/* Check if the page is already mapped and in use */
if(MM::Paging::PteValid(PointerPte))
{
/* Clear the original PTE information */
MM::Paging::SetPte(&Pfn->OriginalPte, 0, MM_PTE_READWRITE | MM_PTE_CACHE_ENABLE);
}
else
{
/* Page is not resident, so save the PTE contents for later use */
Pfn->OriginalPte = *PointerPte;
}
/* Initialize the PTE */
MM::Paging::SetPte(&Pfn->OriginalPte, 0, MM_PTE_GUARDED);
/* Initialize the PFN database entry for this page */
Pfn->u2.ShareCount = 1;
Pfn->u3.e1.Modified = Modified;
Pfn->u3.e1.PageLocation = ActiveAndValid;
Pfn->u3.e2.ReferenceCount = 1;
/* Get the PDE that maps the page table containing this PTE */
Pte = MM::Paging::GetPteAddress(PointerPte);
if(!MM::Paging::PteValid(Pte))
{
/* Check if page table is resident */
Status = MM::PageFault::CheckPdeForPagedPool(PointerPte);
if(Status != STATUS_SUCCESS)
{
/* Could not make the page table resident, crash system */
KE::Crash::PanicEx(0x1,
(ULONG_PTR)0x61940,
(ULONG_PTR)PointerPte,
MM::Paging::GetPageFrameNumber(PointerPte),
(ULONG_PTR)MM::Paging::GetPteVirtualAddress(PointerPte));
}
}
/* Record the page frame of the page table itself */
PageFrameIndex = MM::Paging::GetPageFrameNumber(Pte);
Pfn->u4.PteFrame = PageFrameIndex;
/* Pin the page table in memory by incrementing its PFN share count */
Pfn = &((PMMPFN)MemoryLayout->PfnDatabase)[PageFrameIndex];
/* Initialize the PFN entry */
Pfn->u2.ShareCount++;
Pfn->u3.e1.CacheAttribute = PfnCached;
Pfn->u3.e1.Modified = TRUE;
Pfn->u3.e1.PageLocation = ActiveAndValid;
Pfn->u3.e2.ReferenceCount++;
Pfn->u4.InPageError = FALSE;
/* Check if parent PTE frame exists */
if(ParentFrame)
{
/* Link the page table to its parent */
Pfn->u4.PteFrame = ParentFrame;
/* Get the PFN entry for parent PTE and increment share count */
Pfn = &((PMMPFN)MemoryLayout->PfnDatabase)[ParentFrame];
Pfn->u2.ShareCount++;
}
}
/**