From b1d41be7c9c0dc18cf9b73785eee6a20f13db126 Mon Sep 17 00:00:00 2001
From: oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 2 May 2012 19:55:32 +0000
Subject: 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/PrePi/PeiMPCore.inf  | 1 -
 ArmPlatformPkg/PrePi/PeiUniCore.inf | 4 ++--
 ArmPlatformPkg/PrePi/PrePi.c        | 8 ++++----
 3 files changed, 6 insertions(+), 7 deletions(-)

(limited to 'ArmPlatformPkg/PrePi')

diff --git a/ArmPlatformPkg/PrePi/PeiMPCore.inf b/ArmPlatformPkg/PrePi/PeiMPCore.inf
index 4b05583779..92c1d81f87 100755
--- a/ArmPlatformPkg/PrePi/PeiMPCore.inf
+++ b/ArmPlatformPkg/PrePi/PeiMPCore.inf
@@ -38,7 +38,6 @@
   BaseLib
   DebugLib
   DebugAgentLib
-  ArmCpuLib
   ArmLib
   ArmGicLib
   IoLib
diff --git a/ArmPlatformPkg/PrePi/PeiUniCore.inf b/ArmPlatformPkg/PrePi/PeiUniCore.inf
index 2d3617fd67..cfd40bc155 100755
--- a/ArmPlatformPkg/PrePi/PeiUniCore.inf
+++ b/ArmPlatformPkg/PrePi/PeiUniCore.inf
@@ -1,6 +1,7 @@
 #/** @file
 #  
-#  Copyright (c) 2011, ARM Ltd. All rights reserved.<BR>
+#  Copyright (c) 2011-2012, ARM Ltd. All rights reserved.<BR>
+#  
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
 #  which accompanies this distribution.  The full text of the license may be found at
@@ -38,7 +39,6 @@
   BaseLib
   DebugLib
   DebugAgentLib
-  ArmCpuLib
   ArmLib
   IoLib
   TimerLib
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 ();
     }
   }
   
-- 
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