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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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20
xtoskrnl/mm/i686/pagemap.cc
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@@ -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));
}