ArmPkg/ArmCpuLib: Replaced complex functions ArmCpuSynchronizeWait & ArmCpuSynchronizeSignal by sev & wfe

Previsouly the synchronization of MpCore was using the SGI (Software
Generated Interrupt) to synchronize MpCore during the early boot.
This commit replaced this mechanism by the more appropriate SEV/WFE
instructions (Send/Wait Event instructions).
That also eases the port to a new cpu/platform.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13249 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/Sec/SecEntryPoint.asm

@@ -24,8 +24,8 @@
   IMPORT  ArmDisableCachesAndMmu
   IMPORT  ArmWriteVBar
   IMPORT  ArmReadMpidr
+  IMPORT  ArmCallWFE
   IMPORT  SecVectorTable
-  IMPORT  ArmCpuSynchronizeWait
   EXPORT  _ModuleEntryPoint
 
   PRESERVE8
@@ -61,8 +61,8 @@ _IdentifyCpu
   beq   _InitMem
   
 _WaitInitMem
-  mov   r0, #ARM_CPU_EVENT_BOOT_MEM_INIT
-  bl    ArmCpuSynchronizeWait
+  // Wait for the primary core to initialize the initial memory (event: BOOT_MEM_INIT)
+  bl    ArmCallWFE
   // Now the Init Mem is initialized, we setup the secondary core stacks
   b     _SetupSecondaryCoreStack