A workaround to a compiler bug that causes the high order 32 bits of GetPerformanceCounter() being indeterminate.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1336 6f19259b-4bc3-4df7-8a09-765794883524
2006-08-21 09:32:26 +00:00 · 2006-08-21 09:32:26 +00:00 · f094c270ee
parent 7bcb8d17b2
commit f094c270ee
1 changed files with 2 additions and 1 deletions
--- a/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c
+++ b/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c
@ -210,7 +210,8 @@ GetPerformanceCounter (
  VOID
  )
 {
-  return (UINT32)InternalX86GetTimerTick (InternalX86GetApicBase ());
+  volatile static UINT64 Mask = 0xffffffff;
+  return InternalX86GetTimerTick (InternalX86GetApicBase ()) & Mask;
 }

 /**