From 8513037f2c02fceeff8ced9ecae2e9afc9ce6a78 Mon Sep 17 00:00:00 2001
From: oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Mon, 20 Jun 2011 21:35:50 +0000
Subject: ArmPkg/CpuDxe: Register a callback for the gIdleLoopEventGuid event

This gIdleLoopEventGuid event signals the Cpu that it should go into
the idle state waiting for any events.
CpuSleep() is used in this implementation to make the Cpu wait for
the next interrupt (WFI instruction).



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11863 6f19259b-4bc3-4df7-8a09-765794883524
---
 ArmPkg/Drivers/CpuDxe/CpuDxe.c   | 36 ++++++++++++++++++++++++++++++++++--
 ArmPkg/Drivers/CpuDxe/CpuDxe.inf |  4 ++++
 2 files changed, 38 insertions(+), 2 deletions(-)

(limited to 'ArmPkg/Drivers/CpuDxe')

diff --git a/ArmPkg/Drivers/CpuDxe/CpuDxe.c b/ArmPkg/Drivers/CpuDxe/CpuDxe.c
index 7e863f3936..cea333f91d 100644
--- a/ArmPkg/Drivers/CpuDxe/CpuDxe.c
+++ b/ArmPkg/Drivers/CpuDxe/CpuDxe.c
@@ -1,6 +1,7 @@
 /** @file
 
   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+  Copyright (c) 2011, ARM Limited. All rights reserved.
   
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -14,6 +15,8 @@
 
 #include "CpuDxe.h"
 
+#include <Guid/IdleLoopEvent.h>
+
 BOOLEAN mInterruptState   = FALSE;
 
 
@@ -194,6 +197,23 @@ CpuGetTimerValue (
   return EFI_UNSUPPORTED;
 }
 
+/**
+  Callback function for idle events.
+ 
+  @param  Event                 Event whose notification function is being invoked.
+  @param  Context               The pointer to the notification function's context,
+                                which is implementation-dependent.
+
+**/
+VOID
+EFIAPI
+IdleLoopEventCallback (
+  IN EFI_EVENT                Event,
+  IN VOID                     *Context
+  )
+{
+  CpuSleep ();
+}
 
 //
 // Globals used to initialize the protocol
@@ -219,10 +239,10 @@ CpuDxeInitialize (
   )
 {
   EFI_STATUS  Status;
+  EFI_EVENT    IdleLoopEvent;
 
   InitializeExceptions (&mCpu);  
   
-  
   Status = gBS->InstallMultipleProtocolInterfaces (
                 &mCpuHandle, 
                 &gEfiCpuArchProtocolGuid,           &mCpu, 
@@ -237,6 +257,18 @@ CpuDxeInitialize (
   //
   SyncCacheConfig (&mCpu);
   
+  //
+  // Setup a callback for idle events
+  //
+  Status = gBS->CreateEventEx (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_NOTIFY,
+                  IdleLoopEventCallback,
+                  NULL,
+                  &gIdleLoopEventGuid,
+                  &IdleLoopEvent
+                  );
+  ASSERT_EFI_ERROR (Status);
+
   return Status;
 }
-
diff --git a/ArmPkg/Drivers/CpuDxe/CpuDxe.inf b/ArmPkg/Drivers/CpuDxe/CpuDxe.inf
index 94e91c1ebd..3cf4036cfb 100644
--- a/ArmPkg/Drivers/CpuDxe/CpuDxe.inf
+++ b/ArmPkg/Drivers/CpuDxe/CpuDxe.inf
@@ -3,6 +3,8 @@
 #  DXE CPU driver
 #  
 #  Copyright (c) 2009, Apple Inc. All rights reserved.<BR>
+#  Copyright (c) 2011, ARM Limited. All rights reserved.
+#
 #  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
@@ -45,6 +47,7 @@
   ArmPkg/ArmPkg.dec
   EmbeddedPkg/EmbeddedPkg.dec
   MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
 
 [LibraryClasses]
   BaseMemoryLib
@@ -65,6 +68,7 @@
 
 [Guids]
   gEfiDebugImageInfoTableGuid
+  gIdleLoopEventGuid
 
 [Pcd.common]
   gArmTokenSpaceGuid.PcdVFPEnabled
-- 
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