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Implement unified PTE accessors and management helpers
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This commit is contained in:
Aiken Harris
2025-10-30 20:14:02 +01:00
parent 0120ba167f
commit ffa480d69a
4 changed files with 810 additions and 9 deletions
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411
xtoskrnl/mm/i686/pagemap.cc
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@@ -23,9 +23,25 @@ XTAPI
VOID
MM::PageMap::ClearPte(PHARDWARE_PTE PtePointer)
{
/* Clear PTE */
PtePointer->Long = 0;
}
/**
* Gets the value representing an empty PTE list.
*
* @return This routine returns the value representing an empty PTE list.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetEmptyPteList(VOID)
{
/* Return empty PTE list mask */
return PageMapInfo.EmptyPteList;
}
/**
* Gets the address of the PDE (Page Directory Entry), that maps given address.
*
@@ -47,6 +63,42 @@ MM::PageMap::GetPdeAddress(PVOID Address)
return (PMMPDE)(PageMapInfo.PdeBase + Offset);
}
/**
* Gets the index of the PDE (Page Directory Entry), that maps given address.
*
* @param Address
* Specifies the virtual address for which to retrieve the corresponding PDE.
*
* @return This routine returns the index of the PDE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPdeIndex(PVOID Address)
{
/* Return PDE index */
return ((((ULONG_PTR)(Address)) >> PageMapInfo.PdiShift) & (PageMapInfo.Xpa ? 0x1FF : 0x3FF));
}
/**
* Gets the virtual address that is mapped by a given Page Directory Entry.
*
* @param PdePointer
* Specifies the address of the PDE.
*
* @return This routine returns the virtual address mapped by the PDE.
*
* @since XT 1.0
*/
XTAPI
PVOID
MM::PageMap::GetPdeVirtualAddress(PMMPDE PdePointer)
{
/* Return PDE virtual address */
return ((PVOID)((ULONG)(PdePointer) << 20));
}
/**
* Gets the address of the PPE (Page Directory Pointer Table Entry), that maps given address.
*
@@ -65,6 +117,42 @@ MM::PageMap::GetPpeAddress(PVOID Address)
return (PMMPPE)0;
}
/**
* Gets the index of the PPE (Page Directory Pointer Table Entry), that maps given address.
*
* @param Address
* Specifies the virtual address for which to retrieve the corresponding PPE.
*
* @return This routine returns the index of the PPE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPpeIndex(PVOID Address)
{
/* Return PPE index */
return ((((ULONG_PTR)(Address)) >> MM_PPI_SHIFT) & 0x3) * PageMapInfo.Xpa;
}
/**
* Gets the virtual address that is mapped by a given Page Directory Pointer Table Entry.
*
* @param PpePointer
* Specifies the virtual address of the PPE.
*
* @return This routine returns the virtual address mapped by the PPE.
*
* @since XT 1.0
*/
XTAPI
PVOID
MM::PageMap::GetPpeVirtualAddress(PMMPPE PpePointer)
{
/* Return PPE virtual address */
return (PVOID)((ULONG)(PpePointer) << 30);
}
/**
* Gets the address of the PTE (Page Table Entry), that maps given address.
*
@@ -86,6 +174,133 @@ MM::PageMap::GetPteAddress(PVOID Address)
return (PMMPTE)(PageMapInfo.PteBase + Offset);
}
/**
* Gets the index of the PTE (Page Table Entry), that maps given address.
*
* @param Address
* Specifies the virtual address for which to retrieve the corresponding PTE.
*
* @return This routine returns the index of the PTE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPteIndex(PVOID Address)
{
/* Return PTE index */
return ((((ULONG_PTR)(Address)) >> MM_PTI_SHIFT) & (PageMapInfo.Xpa ? 0x1FF : 0x3FF));
}
/**
* Gets the virtual address that is mapped by a given Page Table Entry.
*
* @param PtePointer
* Specifies the virtual address of the PTE.
*
* @return This routine returns the virtual address mapped by the PTE.
*
* @since XT 1.0
*/
XTAPI
PVOID
MM::PageMap::GetPteVirtualAddress(PMMPTE PtePointer)
{
/* Return PTE virtual address */
return ((PVOID)((ULONG)(PtePointer) << 10));
}
/**
* Advances a PTE pointer by a given number of entries, considering the actual PTE size for PML2.
*
* @param Pte
* The PTE pointer to advance.
*
* @param Count
* The number of PTE entries to advance by.
*
* @return This routine returns the advanced PTE pointer.
*
* @since XT 1.0
*/
XTAPI
PMMPTE
MM::PageMapBasic::AdvancePte(PMMPTE Pte,
ULONG Count)
{
/* Return advanced PTE pointer */
return (PMMPTE)((ULONG_PTR)Pte + (Count * sizeof(MMPML2_PTE)));
}
/**
* Gets the next entry in a PTE list.
*
* @param Pte
* The PTE pointer to get the next entry from.
*
* @return This routine returns the next entry in the PTE list.
*
* @since XT 1.0
*/
XTAPI
ULONG_PTR
MM::PageMapBasic::GetNextEntry(PMMPTE Pte)
{
/* Return next entry in PTE list */
return Pte->Pml2.List.NextEntry;
}
/**
* Advances a PTE pointer, considering the actual PTE size for PML2.
*
* @param Pte
* The PTE pointer to advance.
*
* @return The advanced PTE pointer.
*
* @since XT 1.0
*/
XTAPI
PMMPTE
MM::PageMapBasic::GetNextPte(PMMPTE Pte)
{
/* Return advanced PTE pointer */
return AdvancePte(Pte, 1);
}
/**
* Checks if a PTE list contains only one entry.
*
* @param Pte
* The PTE pointer to check.
*
* @return This routine returns TRUE if the PTE list has only one entry, FALSE otherwise.
*
* @since XT 1.0
*/
XTAPI
BOOLEAN
MM::PageMapBasic::GetOneEntry(PMMPTE Pte)
{
/* Return one entry status */
return Pte->Pml2.List.OneEntry;
}
/**
* Gets the size of a PTE for basic paging (PML2).
*
* @return This routine returns the size of a PTE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMapBasic::GetPteSize(VOID)
{
/* Return the size of MMPTE */
return sizeof(MMPML2_PTE);
}
/**
* Initializes page map information for basic paging (PML2).
*
@@ -100,6 +315,9 @@ MM::PageMapBasic::InitializePageMapInfo(VOID)
/* Set PML2 page map information */
PageMapInfo.Xpa = FALSE;
/* Set PML2 empty PTE list mask */
PageMapInfo.EmptyPteList = (ULONG)0xFFFFF;
/* Set PML2 base addresses */
PageMapInfo.PteBase = MM_PTE_BASE;
PageMapInfo.PdeBase = MM_PDE_LEGACY_BASE;
@@ -123,9 +341,54 @@ XTAPI
BOOLEAN
MM::PageMapBasic::PteValid(PHARDWARE_PTE PtePointer)
{
/* Check if PTE is valid */
return (BOOLEAN)PtePointer->Pml2.Valid;
}
/**
* Sets the next entry in a PTE list.
*
* @param Pte
* The PTE pointer to modify.
*
* @param Value
* The value to set as the next entry.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMapBasic::SetNextEntry(PMMPTE Pte,
ULONG_PTR Value)
{
/* Set next entry in PTE list */
Pte->Pml2.List.NextEntry = Value;
}
/**
* Sets the flag indicating whether a PTE list contains only one entry.
*
* @param Pte
* The PTE pointer to modify.
*
* @param Value
* The value to set. TRUE if the list has only one entry, FALSE otherwise.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMapBasic::SetOneEntry(PMMPTE Pte,
BOOLEAN Value)
{
/* Set one entry status */
Pte->Pml2.List.OneEntry = Value;
}
/**
* Sets a PML2 page table entry (PTE) with the specified physical page and access flags.
*
@@ -148,6 +411,7 @@ MM::PageMapBasic::SetPte(PHARDWARE_PTE PtePointer,
PFN_NUMBER PageFrameNumber,
BOOLEAN Writable)
{
/* Set PTE */
PtePointer->Pml2.PageFrameNumber = PageFrameNumber;
PtePointer->Pml2.Valid = 1;
PtePointer->Pml2.Writable = Writable;
@@ -175,10 +439,102 @@ MM::PageMapBasic::SetPteCaching(PHARDWARE_PTE PtePointer,
BOOLEAN CacheDisable,
BOOLEAN WriteThrough)
{
/* Set caching attributes */
PtePointer->Pml2.CacheDisable = CacheDisable;
PtePointer->Pml2.WriteThrough = WriteThrough;
}
/**
* Advances a PTE pointer by a given number of entries, considering the actual PTE size for PML3.
*
* @param Pte
* The PTE pointer to advance.
*
* @param Count
* The number of PTE entries to advance by.
*
* @return The advanced PTE pointer.
*
* @since XT 1.0
*/
XTAPI
PMMPTE
MM::PageMapXpa::AdvancePte(PMMPTE Pte,
ULONG Count)
{
/* Return advanced PTE pointer */
return (PMMPTE)((ULONG_PTR)Pte + (Count * sizeof(MMPML3_PTE)));
}
/**
* Gets the next entry in a PTE list.
*
* @param Pte
* The PTE pointer to get the next entry from.
*
* @return This routine returns the next entry in the PTE list.
*
* @since XT 1.0
*/
XTAPI
ULONG_PTR
MM::PageMapXpa::GetNextEntry(PMMPTE Pte)
{
/* Return next entry in PTE list */
return Pte->Pml3.List.NextEntry;
}
/**
* Advances a PTE pointer, considering the actual PTE size for PML3.
*
* @param Pte
* The PTE pointer to advance.
*
* @return The advanced PTE pointer.
*
* @since XT 1.0
*/
XTAPI
PMMPTE
MM::PageMapXpa::GetNextPte(PMMPTE Pte)
{
/* Return advanced PTE pointer */
return AdvancePte(Pte, 1);
}
/**
* Checks if a PTE list contains only one entry.
*
* @param Pte
* The PTE pointer to check.
*
* @return This routine returns TRUE if the PTE list has only one entry, FALSE otherwise.
*
* @since XT 1.0
*/
XTAPI
BOOLEAN
MM::PageMapXpa::GetOneEntry(PMMPTE Pte)
{
/* Return one entry status */
return Pte->Pml3.List.OneEntry;
}
/**
* Gets the size of a PTE for XPA paging (PML3).
*
* @return This routine returns the size of a PTE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMapXpa::GetPteSize(VOID)
{
/* Return the size of MMPTE */
return sizeof(MMPML3_PTE);
}
/**
* Initializes page map information for basic paging (PML3).
*
@@ -190,14 +546,17 @@ XTAPI
VOID
MM::PageMapXpa::InitializePageMapInfo(VOID)
{
/* Set PML2 page map information */
/* Set PML3 page map information */
PageMapInfo.Xpa = TRUE;
/* Set PML2 base addresses */
/* Set PML3 empty PTE list mask */
PageMapInfo.EmptyPteList = (ULONG)0xFFFFFFFF;
/* Set PML3 base addresses */
PageMapInfo.PteBase = MM_PTE_BASE;
PageMapInfo.PdeBase = MM_PDE_BASE;
/* Set PML2 shift values */
/* Set PML3 shift values */
PageMapInfo.PdiShift = MM_PDI_SHIFT;
PageMapInfo.PteShift = MM_PTE_SHIFT;
}
@@ -219,6 +578,50 @@ MM::PageMapXpa::PteValid(PHARDWARE_PTE PtePointer)
return (BOOLEAN)PtePointer->Pml3.Valid;
}
/**
* Sets the next entry in a PTE list.
*
* @param Pte
* The PTE pointer to modify.
*
* @param Value
* The value to set as the next entry.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMapXpa::SetNextEntry(PMMPTE Pte,
ULONG_PTR Value)
{
/* Set next entry in PTE list */
Pte->Pml3.List.NextEntry = Value;
}
/**
* Sets the flag indicating whether a PTE list contains only one entry.
*
* @param Pte
* The PTE pointer to modify.
*
* @param Value
* The value to set. TRUE if the list has only one entry, FALSE otherwise.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::PageMapXpa::SetOneEntry(PMMPTE Pte,
BOOLEAN Value)
{
/* Set one entry status */
Pte->Pml3.List.OneEntry = Value;
}
/**
* Sets a PML3 page table entry (PTE) with the specified physical page and access flags.
*
@@ -241,6 +644,7 @@ MM::PageMapXpa::SetPte(PHARDWARE_PTE PtePointer,
PFN_NUMBER PageFrameNumber,
BOOLEAN Writable)
{
/* Set PTE */
PtePointer->Pml3.PageFrameNumber = PageFrameNumber;
PtePointer->Pml3.Valid = 1;
PtePointer->Pml3.Writable = Writable;
@@ -268,6 +672,7 @@ MM::PageMapXpa::SetPteCaching(PHARDWARE_PTE PtePointer,
BOOLEAN CacheDisable,
BOOLEAN WriteThrough)
{
/* Set caching attributes */
PtePointer->Pml3.CacheDisable = CacheDisable;
PtePointer->Pml3.WriteThrough = WriteThrough;
}