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/Sec/SecEntryPoint.asm

@@ -52,10 +52,13 @@ _ModuleEntryPoint
 _IdentifyCpu 
   // Identify CPU ID
   bl    ArmReadMpidr
-  and   r5, r0, #0xf
+  // Get ID of this CPU in Multicore system
+  LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)
+  and   r5, r0, r1
   
-  //get ID of this CPU in Multicore system
-  cmp   r5, #0
+  // Is it the Primary Core ?
+  LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r1)
+  cmp   r5, r1
   // Only the primary core initialize the memory (SMC)
   beq   _InitMem
   
@@ -97,7 +100,7 @@ _SetupStack
   ldr   r3, StartupAddr
   
   // Jump to SEC C code
-  //    r0 = core_id
+  //    r0 = mp_id
   mov   r0, r5
   blx   r3