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Respect architecture-specific PTE layouts and write PTEs via PML-aware helpers

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This commit is contained in:
Aiken Harris
2025-12-22 00:07:48 +01:00
parent 24dccf4bed
commit 755a167f2c
8 changed files with 144 additions and 25 deletions
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102
xtoskrnl/mm/i686/pagemap.cc
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@@ -9,24 +9,6 @@
#include <xtos.hh>
/**
* Clears the contents of a page table entry (PTE).
*
* @param PtePointer
* Pointer to the page table entry (PTE) to be cleared.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMap::ClearPte(IN PMMPTE PtePointer)
{
/* Clear PTE */
PtePointer->Long = 0;
}
/**
* Gets the value representing an empty PTE list.
*
@@ -212,6 +194,24 @@ MM::PageMapBasic::AdvancePte(IN PMMPTE Pte,
return (PMMPTE)((ULONG_PTR)Pte + (Count * sizeof(MMPML2_PTE)));
}
/**
* Clears the contents of a page table entry (PTE).
*
* @param PtePointer
* Pointer to the page table entry (PTE) to be cleared.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMapBasic::ClearPte(IN PMMPTE PtePointer)
{
/* Clear PTE */
PtePointer->Pml2.Long = 0;
}
/**
* Gets the next entry in a PTE list.
*
@@ -469,7 +469,7 @@ MM::PageMapBasic::SetPte(IN PMMPTE PtePointer,
/* Set PTE */
PtePointer->Pml2.Hardware.PageFrameNumber = PageFrameNumber;
PtePointer->Pml2.Hardware.Valid = 1;
PtePointer->Long |= AttributesMask;
PtePointer->Pml2.Long |= AttributesMask;
}
/**
@@ -499,6 +499,28 @@ MM::PageMapBasic::SetPteCaching(IN PMMPTE PtePointer,
PtePointer->Pml2.Hardware.WriteThrough = WriteThrough;
}
/**
* Writes a PML2 page table entry (PTE) with the specified value.
*
* @param Pte
* Pointer to the page table entry (PTE) to write.
*
* @param Value
* The value to write to the PTE.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMapBasic::WritePte(IN PMMPTE Pte,
IN MMPTE Value)
{
/* Write PTE value */
Pte->Pml2.Long = Value.Pml2.Long;
}
/**
* Advances a PTE pointer by a given number of entries, considering the actual PTE size for PML3.
*
@@ -521,6 +543,24 @@ MM::PageMapXpa::AdvancePte(IN PMMPTE Pte,
return (PMMPTE)((ULONG_PTR)Pte + (Count * sizeof(MMPML3_PTE)));
}
/**
* Clears the contents of a page table entry (PTE).
*
* @param PtePointer
* Pointer to the page table entry (PTE) to be cleared.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMapXpa::ClearPte(IN PMMPTE PtePointer)
{
/* Clear PTE */
PtePointer->Pml3.Long = 0;
}
/**
* Gets the next entry in a PTE list.
*
@@ -777,7 +817,7 @@ MM::PageMapXpa::SetPte(IN PMMPTE PtePointer,
/* Set PTE */
PtePointer->Pml3.Hardware.PageFrameNumber = PageFrameNumber;
PtePointer->Pml3.Hardware.Valid = 1;
PtePointer->Long |= AttributesMask;
PtePointer->Pml3.Long |= AttributesMask;
}
/**
@@ -806,3 +846,25 @@ MM::PageMapXpa::SetPteCaching(IN PMMPTE PtePointer,
PtePointer->Pml3.Hardware.CacheDisable = CacheDisable;
PtePointer->Pml3.Hardware.WriteThrough = WriteThrough;
}
/**
* Writes a PML3 page table entry (PTE) with the specified value.
*
* @param Pte
* Pointer to the page table entry (PTE) to write.
*
* @param Value
* The value to write to the PTE.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMapXpa::WritePte(IN PMMPTE Pte,
IN MMPTE Value)
{
/* Write PTE value */
Pte->Pml3.Long = Value.Pml3.Long;
}