A workaround to a compiler bug that causes the high order 32 bits of GetPerformanceCo...

[mirror_edk2.git] / MdePkg / Library / BaseTimerLibLocalApic / x86TimerLib.c

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