ArmPlatformPkg/ArmPlatformLib: Added support for ArmPlatformIsPrimaryCore()

Checking if a core if the primary/boot core used to be done with the macro
IS_PRIMARY_CORE().
Some platforms exposes configuration registers to change the primary core.
Replacing the macro IS_PRIMARY_CORE() by ArmPlatformIsPrimaryCore() allows
some flexibility in the way to check the primary core.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Ryan Harkin <ryan.harkin@linaro.org>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14344 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Include/AsmMacroIoLib.inc

@@ -82,6 +82,10 @@
   
   MACRO
   GetCorePositionFromMpId $Pos, $MpId, $Tmp
+  ;Note: The ARM macro does not support the pre-processing. 0xFF and (0xFF << 8) are the values of
+  ;      ARM_CORE_MASK and ARM_CLUSTER_MASK 
+  mov   $Tmp, #(0xFF :OR: (0xFF << 8))
+  and   $MpId, $Tmp
   lsr   $Pos, $MpId, #6
   and   $Tmp, $MpId, #3
   add   $Pos, $Pos, $Tmp