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

1 files changed, 4 insertions, 4 deletions

diff --git a/ArmPlatformPkg/PrePi/PrePi.c b/ArmPlatformPkg/PrePi/PrePi.c
index f3cb3a121f..5090c25123 100755
--- a/ArmPlatformPkg/PrePi/PrePi.c
+++ b/ArmPlatformPkg/PrePi/PrePi.c
@@ -14,7 +14,6 @@
 

 #include <PiPei.h>

 

-#include <Library/ArmCpuLib.h>

 #include <Library/DebugAgentLib.h>

 #include <Library/PrePiLib.h>

 #include <Library/PrintLib.h>

@@ -204,11 +203,12 @@ CEntryPoint (
     if (IS_PRIMARY_CORE(MpId)) {

       mGlobalVariableBase = GlobalVariableBase;

       if (ArmIsMpCore()) {

-        ArmCpuSynchronizeSignal (ARM_CPU_EVENT_DEFAULT);

+        // Signal the Global Variable Region is defined (event: ARM_CPU_EVENT_DEFAULT)

+        ArmCallSEV ();

       }

     } else {

-      // Wait the Primay core has defined the address of the Global Variable region

-      ArmCpuSynchronizeWait (ARM_CPU_EVENT_DEFAULT);

+      // Wait the Primay core has defined the address of the Global Variable region (event: ARM_CPU_EVENT_DEFAULT)

+      ArmCallWFE ();

     }

   }