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Add logic to insert pages at the head of standby list
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This commit is contained in:
Aiken Harris
2026-01-05 23:12:58 +01:00
parent 4b50278ac9
commit bd1a3605d2
2 changed files with 88 additions and 4 deletions
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1
xtoskrnl/includes/mm/pfn.hh
View File

@@ -65,6 +65,7 @@ namespace MM
IN PFN_NUMBER PageFrameIndex);
STATIC XTAPI VOID LinkPfnForPageTable(IN PFN_NUMBER PageFrameIndex,
IN PMMPTE PointerPte);
STATIC XTFASTCALL VOID LinkStandbyPage(IN PFN_NUMBER PageFrameIndex);
STATIC XTAPI VOID ProcessMemoryDescriptor(IN PFN_NUMBER BasePage,
IN PFN_NUMBER PageCount,
IN LOADER_MEMORY_TYPE MemoryType);

91
xtoskrnl/mm/pfn.cc
View File

@@ -209,10 +209,8 @@ MM::Pfn::DecrementReferenceCount(IN PMMPFN PageFrameNumber,
/* Link clean page to the standby list */
if(BeginStandbyList)
{
UNIMPLEMENTED;
/* Temporarily link clean page to the end of the standby list */
LinkPage(&StandbyPagesList, PageFrameIndex);
/* Link clean page to the beginning of the standby list */
LinkStandbyPage(PageFrameIndex);
}
else
{
@@ -866,6 +864,91 @@ MM::Pfn::LinkPfnToPte(IN PFN_NUMBER PageFrameIndex,
Pfn->u2.ShareCount++;
}
/**
* Links a page to the beginning of the appropriate standby or ROM list.
*
* @param PageFrameIndex
* The Page Frame Number (PFN) of the page to link.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTFASTCALL
VOID
MM::Pfn::LinkStandbyPage(IN PFN_NUMBER PageFrameIndex)
{
PMMPFN AdjacentPageFrame, CurrentPageFrame;
PMMMEMORY_LAYOUT MemoryLayout;
PFN_NUMBER Flink;
/* Get the memory layout */
MemoryLayout = MM::Manager::GetMemoryLayout();
/* Get the PFN database entry for the target page */
CurrentPageFrame = &((PMMPFN)MemoryLayout->PfnDatabaseAddress)[PageFrameIndex];
/* Check if the page is part of a ROM image */
if(CurrentPageFrame->u3.e1.Rom == 1)
{
/* Increment the total number of ROM pages */
RomPagesList.Total++;
/* If the ROM list is not empty, link the new page */
if(RomPagesList.Blink != (ULONG_PTR)-1)
{
/* Update the old tail to point to the new page */
AdjacentPageFrame = &((PMMPFN)MemoryLayout->PfnDatabaseAddress)[RomPagesList.Blink];
AdjacentPageFrame->u1.Flink = PageFrameIndex;
}
else
{
/* Otherwise, this page is now the head of the list */
RomPagesList.Flink = PageFrameIndex;
}
/* Set the new page as the tail and update its links */
RomPagesList.Blink = PageFrameIndex;
CurrentPageFrame->u1.Flink = (ULONG_PTR)-1;
CurrentPageFrame->u2.Blink = RomPagesList.Blink;
CurrentPageFrame->u3.e1.PageLocation = StandbyPageList;
/* ROM pages require no further processing */
return;
}
/* Increment the count of pages on the standby list */
StandbyPagesList.Total++;
/* Save the old head and set the current page as the new head */
Flink = StandbyPagesList.Flink;
StandbyPagesList.Flink = PageFrameIndex;
/* Point the new head to the old one, marking it as the list front */
CurrentPageFrame->u1.Flink = Flink;
CurrentPageFrame->u2.Blink = MAXULONG_PTR;
/* If the ROM list is not empty, link the new page */
if(Flink != MAXULONG_PTR)
{
/* Update the old head to point to the new page */
AdjacentPageFrame = &((PMMPFN)MemoryLayout->PfnDatabaseAddress)[Flink];
AdjacentPageFrame->u2.Blink = PageFrameIndex;
}
else
{
/* Otherwise, this page is now the tail of the list */
StandbyPagesList.Blink = PageFrameIndex;
}
/* Update the page's location to the standby list */
CurrentPageFrame->u3.e1.PageLocation = StandbyPageList;
/* Increment number of available pages */
IncrementAvailablePages();
}
/**
* Processes a memory descriptor and initializes the corresponding PFN database entries
*