Allocate memory buffer to store TscFrequency, and InstallConfigurationTable with the pointer to this buffer.

Signed-off-by: lzeng14
Reviewed-by: lgao4


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12151 6f19259b-4bc3-4df7-8a09-765794883524

PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c

@@ -38,6 +38,7 @@
 #include <Library/PciLib.h>
 #include <Library/PcdLib.h>
 #include <Library/UefiLib.h>
+#include <Library/DebugLib.h>
 
 #include <Guid/TscFrequency.h>
 
@@ -117,15 +118,19 @@ DxeTscTimerLibConstructor (
   }
   EndTSC = AsmReadTsc();    // TSC value 1ms later
 
-  mTscFrequency =   MultU64x32 (
+  Status = gBS->AllocatePool (EfiBootServicesData, sizeof (UINT64), &TscFrequency);
+  ASSERT_EFI_ERROR (Status);
+
+  *TscFrequency = MultU64x32 (
                     (EndTSC - StartTSC),      // Number of TSC counts in 1ms
                     1000                      // Number of ms in a second
                   );
   //
-  // mTscFrequency is now equal to the number of TSC counts per second, install system configuration table for it.
+  // TscFrequency now points to the number of TSC counts per second, install system configuration table for it.
   //
-  gBS->InstallConfigurationTable (&gEfiTscFrequencyGuid, &mTscFrequency);
+  gBS->InstallConfigurationTable (&gEfiTscFrequencyGuid, TscFrequency);
 
+  mTscFrequency = *TscFrequency;
   return EFI_SUCCESS;
 }
 

PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.inf

@@ -49,6 +49,7 @@
   IoLib
   BaseLib
   UefiLib
+  DebugLib
 
 [Guids]
   gEfiTscFrequencyGuid                          ## CONSUMES ## System Configuration Table