Execute 'doze' in idle loop.

Change-Id: Ifd611129c2d7173b5e0dec36c870e06a4d851009
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/1384
Tested-by: Jenkins Server
Reviewed-by: Douglas R. Gilbert <dgilbert@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 35 insertions, 24 deletions

diff --git a/src/sys/prof/idletask.C b/src/sys/prof/idletask.C
index 843f26628..da568f955 100644
--- a/src/sys/prof/idletask.C
+++ b/src/sys/prof/idletask.C
@@ -1,26 +1,26 @@
-//  IBM_PROLOG_BEGIN_TAG
-//  This is an automatically generated prolog.
-//
-//  $Source: src/sys/prof/idletask.C $
-//
-//  IBM CONFIDENTIAL
-//
-//  COPYRIGHT International Business Machines Corp. 2012
-//
-//  p1
-//
-//  Object Code Only (OCO) source materials
-//  Licensed Internal Code Source Materials
-//  IBM HostBoot Licensed Internal Code
-//
-//  The source code for this program is not published or other-
-//  wise divested of its trade secrets, irrespective of what has
-//  been deposited with the U.S. Copyright Office.
-//
-//  Origin: 30
-//
-//  IBM_PROLOG_END
-
+/*  IBM_PROLOG_BEGIN_TAG
+ *  This is an automatically generated prolog.
+ *
+ *  $Source: src/sys/prof/idletask.C $
+ *
+ *  IBM CONFIDENTIAL
+ *
+ *  COPYRIGHT International Business Machines Corp. 2012
+ *
+ *  p1
+ *
+ *  Object Code Only (OCO) source materials
+ *  Licensed Internal Code Source Materials
+ *  IBM HostBoot Licensed Internal Code
+ *
+ *  The source code for this program is not published or other-
+ *  wise divested of its trade secrets, irrespective of what has
+ *  been deposited with the U.S. Copyright Office.
+ *
+ *  Origin: 30
+ *
+ *  IBM_PROLOG_END_TAG
+ */
 /** @file idletask.C
  *  @brief Code for the kernel idle-loop.
  *
@@ -31,11 +31,22 @@
 
 #include <kernel/taskmgr.H>
 #include <arch/ppc.H>
+#include <sys/syscall.h>
+
+using namespace Systemcalls;
 
 void TaskManager::idleTaskLoop(void* unused)
 {
     while(1)
     {
-	setThreadPriorityLow();
+	// Lower priority (and yield simics thread).
+        setThreadPriorityLow();
+
+        // Request privilege escalation for doze.
+        register uint64_t syscall = MISC_CPUDOZE;
+        asm volatile("or 3, %0, %0; sc" :: "r" (syscall) : "r3");
+
+        // Execute doze.
+        doze();
     }
 }