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/PrePeiCore/PrePeiCore.c

@@ -36,7 +36,7 @@ EFI_PEI_PPI_DESCRIPTOR      gSecPpiTable[] = {
 
 VOID
 CEntryPoint (
-  IN  UINTN                     CoreId,
+  IN  UINTN                     MpId,
   IN  EFI_PEI_CORE_ENTRY_POINT  PeiCoreEntryPoint
   )
 {
@@ -62,7 +62,7 @@ CEntryPoint (
   //Note: The MMU will be enabled by MemoryPeim. Only the primary core will have the MMU on.
 
   //If not primary Jump to Secondary Main
-  if(0 == CoreId) {
+  if (IS_PRIMARY_CORE(MpId)) {
     // Initialize the Debug Agent for Source Level Debugging
     InitializeDebugAgent (DEBUG_AGENT_INIT_POSTMEM_SEC, NULL, NULL);
     SaveAndSetDebugTimerInterrupt (TRUE);
@@ -70,7 +70,7 @@ CEntryPoint (
     // Goto primary Main.
     PrimaryMain (PeiCoreEntryPoint);
   } else {
-    SecondaryMain (CoreId);
+    SecondaryMain (MpId);
   }
 
   // PEI Core should always load and never return