ArmPlatformPkg: Introduce Primary core macros

On MpCore system, the primary core can now be any core of the system.

To identify the primary core, you can use 'gArmTokenSpaceGuid.PcdArmPrimaryCoreMask'
and 'gArmTokenSpaceGuid.PcdArmPrimaryCore'.
These PCDs by default use the ClusterId and CoreId to identify the core. And the
primary core is defined as the ClusetrId=0 and CoreId=0.

The helper macros are: IS_PRIMARY_CORE(MpId), GET_CORE_ID(MpId), GET_CLUSTER_ID(MpId),
GET_CORE_POS(MpId), PRIMARY_CORE_ID.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12412 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/PrePi/PrePi.c

@@ -136,13 +136,13 @@ PrePiMain (
 
 VOID
 CEntryPoint (
-  IN  UINTN                     CoreId,
+  IN  UINTN                     MpId,
   IN  UINTN                     UefiMemoryBase
   )
 {
   UINT64   StartTimeStamp;
  
-  if ((CoreId == ARM_PRIMARY_CORE) && PerformanceMeasurementEnabled ()) {
+  if (IS_PRIMARY_CORE(MpId) && PerformanceMeasurementEnabled ()) {
     // Initialize the Timer Library to setup the Timer HW controller
     TimerConstructor ();
     // We cannot call yet the PerformanceLib because the HOB List has not been initialized
@@ -168,11 +168,11 @@ CEntryPoint (
   ArmWriteVBar ((UINT32)PrePiVectorTable);
 
   // If not primary Jump to Secondary Main
-  if (CoreId == ARM_PRIMARY_CORE) {
+  if (IS_PRIMARY_CORE(MpId)) {
     // Goto primary Main.
     PrimaryMain (UefiMemoryBase, StartTimeStamp);
   } else {
-    SecondaryMain (CoreId);
+    SecondaryMain (MpId);
   }
 
   // DXE Core should always load and never return