ClearMasks and OrMasks are not 8-byte aligned.
But SetMem64 requires the input address is 8-byte aligned.
If the input is not 8-byte aligned, assertion is hit.
Use SetMem instead.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <[email protected]>
Cc: Eric Dong <[email protected]>
---
 UefiCpuPkg/Library/MtrrLib/MtrrLib.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c 
b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
index 200becdd4a..8e46e46cd4 100644
--- a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
+++ b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
@@ -2123,8 +2123,8 @@ MtrrLibSetBelow1MBMemoryAttribute (
   //
   // (Value & ~0 | 0) still equals to (Value)
   //
-  SetMem64 (ClearMasks, sizeof (ClearMasks), 0);
-  SetMem64 (OrMasks, sizeof (OrMasks), 0);
+  SetMem (ClearMasks, sizeof (ClearMasks), 0);
+  SetMem (OrMasks, sizeof (OrMasks), 0);
 
   MsrIndex = (UINT32)-1;
   while ((BaseAddress < BASE_1MB) && (Length != 0)) {
-- 
2.12.2.windows.2

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