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Clarify page table entry offset semantics
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This commit is contained in:
Aiken Harris
2025-12-18 22:38:59 +01:00
parent b183d52806
commit 570301bb35
4 changed files with 38 additions and 37 deletions
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10
xtoskrnl/includes/mm/amd64/pagemap.hh
View File

@@ -29,23 +29,23 @@ namespace MM
XTAPI PMMPTE GetNextPte(IN PMMPTE Pte);
XTAPI BOOLEAN GetOneEntry(IN PMMPTE Pte);
XTAPI PMMP5E GetP5eAddress(IN PVOID Address);
XTAPI ULONG GetP5eIndex(IN PVOID Address);
XTAPI ULONG GetP5eOffset(IN PVOID Address);
XTAPI PVOID GetP5eVirtualAddress(IN PMMP5E P5ePointer);
XTAPI PFN_NUMBER GetPageFrameNumber(IN PMMPTE Pte);
XTAPI PMMPDE GetPdeAddress(IN PVOID Address);
XTAPI ULONG GetPdeIndex(IN PVOID Address);
XTAPI ULONG GetPdeOffset(IN PVOID Address);
VIRTUAL XTAPI PVOID GetPdeVirtualAddress(IN PMMPDE PdePointer) = 0;
XTAPI PMMPPE GetPpeAddress(IN PVOID Address);
XTAPI ULONG GetPpeIndex(IN PVOID Address);
XTAPI ULONG GetPpeOffset(IN PVOID Address);
VIRTUAL XTAPI PVOID GetPpeVirtualAddress(IN PMMPPE PpePointer) = 0;
XTAPI PMMPTE GetPteAddress(IN PVOID Address);
XTAPI LONG GetPteDistance(PMMPTE EndPte,
PMMPTE StartPte);
XTAPI ULONG GetPteIndex(IN PVOID Address);
XTAPI ULONG GetPteOffset(IN PVOID Address);
XTAPI ULONG GetPteSize(VOID);
VIRTUAL XTAPI PVOID GetPteVirtualAddress(IN PMMPTE PtePointer) = 0;
XTAPI PMMPXE GetPxeAddress(IN PVOID Address);
XTAPI ULONG GetPxeIndex(IN PVOID Address);
XTAPI ULONG GetPxeOffset(IN PVOID Address);
VIRTUAL XTAPI PVOID GetPxeVirtualAddress(IN PMMPXE PxePointer) = 0;
XTAPI BOOLEAN GetXpaStatus();
VIRTUAL XTAPI VOID InitializePageMapInfo(VOID) = 0;

6
xtoskrnl/includes/mm/i686/pagemap.hh
View File

@@ -30,13 +30,13 @@ namespace MM
VIRTUAL XTAPI BOOLEAN GetOneEntry(IN PMMPTE Pte) = 0;
VIRTUAL XTAPI PFN_NUMBER GetPageFrameNumber(IN PMMPTE Pte) = 0;
XTAPI PMMPDE GetPdeAddress(IN PVOID Address);
XTAPI ULONG GetPdeIndex(IN PVOID Address);
XTAPI ULONG GetPdeOffset(IN PVOID Address);
VIRTUAL XTAPI PVOID GetPdeVirtualAddress(IN PMMPDE PdePointer) = 0;
XTAPI PMMPPE GetPpeAddress(IN PVOID Address);
XTAPI ULONG GetPpeIndex(IN PVOID Address);
XTAPI ULONG GetPpeOffset(IN PVOID Address);
XTAPI PVOID GetPpeVirtualAddress(IN PMMPPE PpePointer);
XTAPI PMMPTE GetPteAddress(IN PVOID Address);
XTAPI ULONG GetPteIndex(IN PVOID Address);
XTAPI ULONG GetPteOffset(IN PVOID Address);
VIRTUAL XTAPI LONG GetPteDistance(PMMPTE EndPte,
PMMPTE StartPte) = 0;
VIRTUAL XTAPI ULONG GetPteSize(VOID) = 0;

39
xtoskrnl/mm/amd64/pagemap.cc
View File

@@ -140,19 +140,20 @@ MM::PageMap::GetP5eAddress(IN PVOID Address)
}
/**
* Gets the index of the P5E (Page Map Level 5 Entry), that maps given address.
* Gets the Offset of the P5E (Page Map Level 5 Entry), that maps given address.
*
* @param Address
* Specifies the virtual address for which to retrieve the corresponding P5E.
*
* @return This routine returns the index of the P5E, or NULLPTR if LA57 is not enabled.
* @return This routine returns the Offset of the P5E, or NULLPTR if LA57 is not enabled.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetP5eIndex(IN PVOID Address)
MM::PageMap::GetP5eOffset(IN PVOID Address)
{
/* Return P5E Offset */
return (((((ULONGLONG)Address) >> MM_P5I_SHIFT) & 0x1FF) * PageMapInfo.Xpa);
}
@@ -212,20 +213,20 @@ MM::PageMap::GetPdeAddress(IN PVOID Address)
}
/**
* Gets the index of the PDE (Page Directory Entry), that maps given address.
* Gets the Offset 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.
* @return This routine returns the Offset of the PDE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPdeIndex(IN PVOID Address)
MM::PageMap::GetPdeOffset(IN PVOID Address)
{
/* Return PDE index */
/* Return PDE Offset */
return ((((ULONGLONG)Address) >> MM_PDI_SHIFT) & 0x1FF);
}
@@ -251,20 +252,20 @@ MM::PageMap::GetPpeAddress(IN PVOID Address)
}
/**
* Gets the index of the PPE (Page Directory Pointer Table Entry), that maps given address.
* Gets the Offset 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.
* @return This routine returns the Offset of the PPE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPpeIndex(IN PVOID Address)
MM::PageMap::GetPpeOffset(IN PVOID Address)
{
/* Return PPE index */
/* Return PPE Offset */
return ((((ULONGLONG)Address) >> MM_PPI_SHIFT) & 0x1FF);
}
@@ -312,20 +313,20 @@ MM::PageMap::GetPteDistance(PMMPTE EndPte,
}
/**
* Gets the index of the PTE (Page Table Entry), that maps given address.
* Gets the Offset 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.
* @return This routine returns the Offset of the PTE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPteIndex(IN PVOID Address)
MM::PageMap::GetPteOffset(IN PVOID Address)
{
/* Return PTE index */
/* Return PTE Offset */
return ((((ULONGLONG)Address) >> MM_PTI_SHIFT) & 0x1FF);
}
@@ -366,20 +367,20 @@ MM::PageMap::GetPxeAddress(IN PVOID Address)
}
/**
* Gets the index of the PXE (Extended Page Entry), that maps given address.
* Gets the Offset of the PXE (Extended Page Entry), that maps given address.
*
* @param Address
* Specifies the virtual address for which to retrieve the corresponding PXE.
*
* @return This routine returns the index of the PXE.
* @return This routine returns the Offset of the PXE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPxeIndex(IN PVOID Address)
MM::PageMap::GetPxeOffset(IN PVOID Address)
{
/* Return PXE index */
/* Return PXE Offset */
return ((((ULONGLONG)Address) >> MM_PXI_SHIFT) & 0x1FF);
}

20
xtoskrnl/mm/i686/pagemap.cc
View File

@@ -64,20 +64,20 @@ MM::PageMap::GetPdeAddress(IN PVOID Address)
}
/**
* Gets the index of the PDE (Page Directory Entry), that maps given address.
* Gets the Offset 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.
* @return This routine returns the Offset of the PDE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPdeIndex(IN PVOID Address)
MM::PageMap::GetPdeOffset(IN PVOID Address)
{
/* Return PDE index */
/* Return PDE Offset */
return ((((ULONG_PTR)(Address)) >> PageMapInfo.PdiShift) & (PageMapInfo.Xpa ? 0x1FF : 0x3FF));
}
@@ -101,7 +101,7 @@ MM::PageMap::GetPpeAddress(IN PVOID Address)
}
/**
* Gets the index of the PPE (Page Directory Pointer Table Entry), that maps given address.
* Gets the offset 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.
@@ -112,7 +112,7 @@ MM::PageMap::GetPpeAddress(IN PVOID Address)
*/
XTAPI
ULONG
MM::PageMap::GetPpeIndex(IN PVOID Address)
MM::PageMap::GetPpeOffset(IN PVOID Address)
{
/* Return zero */
return 0;
@@ -158,20 +158,20 @@ MM::PageMap::GetPteAddress(IN PVOID Address)
}
/**
* Gets the index of the PTE (Page Table Entry), that maps given address.
* Gets the Offset 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.
* @return This routine returns the Offset of the PTE.
*
* @since XT 1.0
*/
XTAPI
ULONG
MM::PageMap::GetPteIndex(IN PVOID Address)
MM::PageMap::GetPteOffset(IN PVOID Address)
{
/* Return PTE index */
/* Return PTE Offset */
return ((((ULONG_PTR)(Address)) >> MM_PTI_SHIFT) & (PageMapInfo.Xpa ? 0x1FF : 0x3FF));
}