Calculate byte offset in MSR directly and removing the loop.
Cc: Feng Tian <feng.t...@intel.com>
Cc: Michael Kinney <michael.d.kin...@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff....@intel.com>
---
UefiCpuPkg/Library/MtrrLib/MtrrLib.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
index fd3a617..9fb3a31 100644
--- a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
+++ b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
@@ -485,18 +485,10 @@ ProgramFixedMtrr (
//
// We found the fixed MTRR to be programmed
//
- for (ByteShift = 0; ByteShift < 8; ByteShift++) {
- if (*Base ==
- (
- mMtrrLibFixedMtrrTable[MsrNum].BaseAddress +
- (ByteShift * mMtrrLibFixedMtrrTable[MsrNum].Length)
- )
- ) {
- break;
- }
- }
+ ByteShift = ((UINT32)*Base - mMtrrLibFixedMtrrTable[MsrNum].BaseAddress)
+ / mMtrrLibFixedMtrrTable[MsrNum].Length;
- if (ByteShift == 8) {
+ if (ByteShift >= 8) {
return RETURN_UNSUPPORTED;
}
--
2.7.4.windows.1
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