Changed GetPerformanceCounter() to use the most efficient mean to unsigned extend...

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1343 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c b/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c
index fe18878d19d05f9014c40d126737ef8bc0880a74..dd240d88d0d10a897f94473e2387205cefee4739 100644 (file)
--- a/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c
+++ b/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c
@@ -210,8 +210,7 @@ GetPerformanceCounter (
   VOID\r
   )\r
 {\r
-  volatile static UINT64 Mask = 0xffffffff;\r
-  return InternalX86GetTimerTick (InternalX86GetApicBase ()) & Mask;\r
+  return (UINT32)InternalX86GetTimerTick (InternalX86GetApicBase ());\r
 }\r
 \r
 /**\r