Move some local variable initialization to the beginning of the
function. Also delete duplicated calculation for RegionLength.
Signed-off-by: Dun Tan <dun....@intel.com>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Rahul Kumar <rahul1.ku...@intel.com>
Cc: Gerd Hoffmann <kra...@redhat.com>
---
UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
diff --git a/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
b/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
index 218068a3e1..127b65183f 100644
--- a/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
+++ b/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
@@ -258,6 +258,7 @@ PageTableLibMapInLevel (
UINTN BitStart;
UINTN Index;
IA32_PAGING_ENTRY *PagingEntry;
+ UINTN PagingEntryIndex;
IA32_PAGING_ENTRY *CurrentPagingEntry;
UINT64 RegionLength;
UINT64 SubLength;
@@ -288,6 +289,14 @@ PageTableLibMapInLevel (
LocalParentAttribute.Uint64 = ParentAttribute->Uint64;
ParentAttribute = &LocalParentAttribute;
+ //
+ // RegionLength: 256T (1 << 48) 512G (1 << 39), 1G (1 << 30), 2M (1 << 21)
or 4K (1 << 12).
+ //
+ BitStart = 12 + (Level - 1) * 9;
+ PagingEntryIndex = (UINTN)BitFieldRead64 (LinearAddress + Offset, BitStart,
BitStart + 9 - 1);
+ RegionLength = REGION_LENGTH (Level);
+ RegionMask = RegionLength - 1;
+
//
// ParentPagingEntry ONLY is deferenced for checking Present and MustBeOne
bits
// when Modify is FALSE.
@@ -353,8 +362,7 @@ PageTableLibMapInLevel (
//
PageTableLibSetPnle (&ParentPagingEntry->Pnle, &NopAttribute,
&AllOneMask);
- RegionLength = REGION_LENGTH (Level);
- PagingEntry = (IA32_PAGING_ENTRY
*)(UINTN)IA32_PNLE_PAGE_TABLE_BASE_ADDRESS (&ParentPagingEntry->Pnle);
+ PagingEntry = (IA32_PAGING_ENTRY
*)(UINTN)IA32_PNLE_PAGE_TABLE_BASE_ADDRESS (&ParentPagingEntry->Pnle);
for (SubOffset = 0, Index = 0; Index < 512; Index++) {
PagingEntry[Index].Uint64 = OneOfPagingEntry.Uint64 + SubOffset;
SubOffset += RegionLength;
@@ -425,15 +433,10 @@ PageTableLibMapInLevel (
}
//
- // RegionLength: 256T (1 << 48) 512G (1 << 39), 1G (1 << 30), 2M (1 << 21)
or 4K (1 << 12).
// RegionStart: points to the linear address that's aligned on RegionLength
and lower than (LinearAddress + Offset).
//
- BitStart = 12 + (Level - 1) * 9;
- Index = (UINTN)BitFieldRead64 (LinearAddress + Offset, BitStart,
BitStart + 9 - 1);
- RegionLength = LShiftU64 (1, BitStart);
- RegionMask = RegionLength - 1;
- RegionStart = (LinearAddress + Offset) & ~RegionMask;
-
+ Index = PagingEntryIndex;
+ RegionStart = (LinearAddress + Offset) & ~RegionMask;
ParentAttribute->Uint64 = PageTableLibGetPnleMapAttribute
(&ParentPagingEntry->Pnle, ParentAttribute);
//
--
2.31.1.windows.1
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