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Correctly setup PFN database for ROM and in-use pages
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This commit is contained in:
Aiken Harris
2026-01-06 14:49:30 +01:00
parent 36e53bfc8c
commit bee91d0c71
1 changed files with 35 additions and 20 deletions
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55
xtoskrnl/mm/i686/pfn.cc
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@@ -177,7 +177,8 @@ MM::Pfn::ProcessMemoryDescriptor(IN PFN_NUMBER BasePage,
IN PFN_NUMBER PageCount,
IN LOADER_MEMORY_TYPE MemoryType)
{
PFN_NUMBER CurrentPage, PageNumber;
PFN_NUMBER PageNumber;
PMMPDE PointerPde;
PMMPFN Pfn;
/* Check if the memory descriptor describes a free memory region */
@@ -186,13 +187,8 @@ MM::Pfn::ProcessMemoryDescriptor(IN PFN_NUMBER BasePage,
/* Iterate over each page in this free memory run */
for(PageNumber = 0; PageNumber < PageCount; PageNumber++)
{
/* Get the PFN entry for the current page and set its initial cache attribute */
CurrentPage = BasePage + PageNumber;
Pfn = GetPfnEntry(CurrentPage);
Pfn->u3.e1.CacheAttribute = PfnNonCached;
/* Add the page to the free list to make it available for allocation */
LinkFreePage(CurrentPage);
LinkFreePage(BasePage + PageNumber);
}
}
else
@@ -215,17 +211,24 @@ MM::Pfn::ProcessMemoryDescriptor(IN PFN_NUMBER BasePage,
/* Get the PFN entry for the current ROM page */
Pfn = GetPfnEntry(BasePage + PageNumber);
/* Initialize the PFN entry to represent a ROM page */
Pfn->PteAddress = 0;
Pfn->u1.Flink = 0;
Pfn->u2.ShareCount = 0;
Pfn->u3.e1.CacheAttribute = PfnNonCached;
Pfn->u3.e1.PageLocation = 0;
Pfn->u3.e1.PrototypePte = 1;
Pfn->u3.e1.Rom = 1;
Pfn->u3.e2.ReferenceCount = 0;
Pfn->u4.InPageError = 0;
Pfn->u4.PteFrame = 0;
/* Ensure that the page is not already in-use */
if(Pfn->u3.e2.ReferenceCount == 0)
{
/* Get the page directory entry for the current page */
PointerPde = MM::Paging::GetPdeAddress((PVOID)(KSEG0_BASE + (BasePage << MM_PAGE_SHIFT)));
/* Initialize the PFN entry to represent a ROM page */
Pfn->PteAddress = MM::Paging::GetPteAddress((PVOID)(KSEG0_BASE + (BasePage << MM_PAGE_SHIFT)));
Pfn->u1.Flink = 0;
Pfn->u2.ShareCount = 0;
Pfn->u3.e1.CacheAttribute = PfnNonCached;
Pfn->u3.e1.PageLocation = 0;
Pfn->u3.e1.PrototypePte = 1;
Pfn->u3.e1.Rom = 1;
Pfn->u3.e2.ReferenceCount = 0;
Pfn->u4.InPageError = 0;
Pfn->u4.PteFrame = MM::Paging::GetPageFrameNumber(PointerPde);
}
}
break;
default:
@@ -235,8 +238,20 @@ MM::Pfn::ProcessMemoryDescriptor(IN PFN_NUMBER BasePage,
/* Get the PFN entry for the current in-use page */
Pfn = GetPfnEntry(BasePage + PageNumber);
/* Mark the PFN as active and valid to prevent it from being allocated */
Pfn->u3.e1.PageLocation = ActiveAndValid;
/* Ensure that the page is not already in-use */
if(Pfn->u3.e2.ReferenceCount == 0)
{
/* Get the page directory entry for the current page */
PointerPde = MM::Paging::GetPdeAddress((PVOID)(KSEG0_BASE + (BasePage << MM_PAGE_SHIFT)));
/* Initialize the PFN entry to represent an in-use page and prevent it from being allocated */
Pfn->PteAddress = MM::Paging::GetPteAddress((PVOID)(KSEG0_BASE + (BasePage << MM_PAGE_SHIFT)));
Pfn->u2.ShareCount++;
Pfn->u3.e1.CacheAttribute = PfnNonCached;
Pfn->u3.e1.PageLocation = ActiveAndValid;
Pfn->u3.e2.ReferenceCount = 1;
Pfn->u4.PteFrame = MM::Paging::GetPageFrameNumber(PointerPde);
}
}
break;
}