added PcdPlatformBusSpeed for BaseTimerLibLocalApic, thus this timer instance needn't depend on types of CPUs

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1909 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseTimerLibLocalApic/BaseTimerLibLocalApic.msa

@@ -35,6 +35,9 @@
     <LibraryClass Usage="ALWAYS_CONSUMED">
       <Keyword>DebugLib</Keyword>
     </LibraryClass>
+    <LibraryClass Usage="ALWAYS_CONSUMED">
+      <Keyword>PcdLib</Keyword>
+    </LibraryClass>
   </LibraryClassDefinitions>
   <SourceFiles>
     <Filename SupArchList="IA32">x86TimerLib.c</Filename>
@@ -49,4 +52,11 @@
     <Specification>EFI_SPECIFICATION_VERSION 0x00020000</Specification>
     <Specification>EDK_RELEASE_VERSION 0x00020000</Specification>
   </Externs>
+  <PcdCoded>
+    <PcdEntry PcdItemType="FIXED_AT_BUILD" Usage="ALWAYS_CONSUMED">
+      <C_Name>PcdPlatformBusSpeed</C_Name>
+      <TokenSpaceGuidCName>gEfiMdePkgTokenSpaceGuid</TokenSpaceGuidCName>
+      <HelpText>This value is the Bus Speed on platform</HelpText>
+    </PcdEntry>
+  </PcdCoded>
 </ModuleSurfaceArea>

MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c

@@ -19,18 +19,9 @@
 **/
 
 //
-// The following 2 arrays are used in calculating the frequency of local APIC
+// The following array is used in calculating the frequency of local APIC
 // timer. Refer to IA-32 developers' manual for more details.
 //
-
-GLOBAL_REMOVE_IF_UNREFERENCED
-CONST UINT32                          mTimerLibLocalApicFrequencies[] = {
-  100000000,
-  133000000,
-  200000000,
-  166000000
-};
-
 GLOBAL_REMOVE_IF_UNREFERENCED
 CONST UINT8                           mTimerLibLocalApicDivisor[] = {
   0x02, 0x04, 0x08, 0x10,
@@ -73,7 +64,7 @@ InternalX86GetTimerFrequency (
   )
 {
   return
-    mTimerLibLocalApicFrequencies[AsmMsrBitFieldRead32 (44, 16, 18)] /
+    PcdGet32(PcdPlatformBusSpeed) /
     mTimerLibLocalApicDivisor[MmioBitFieldRead32 (ApicBase + 0x3e0, 0, 3)];
 }
 
@@ -255,5 +246,5 @@ GetPerformanceCounterProperties (
     *EndValue = 0;
   }
 
-  return (UINT64)InternalX86GetTimerFrequency (ApicBase);
+  return PcdGet32(PcdPlatformBusSpeed);
 }