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/* 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.
*
* This code exists here under the sys/prof directory to ensure that it does
* not get instrumented with code coverage. The idle threads run stack-less
* and bad things happen if they have been instrumented.
*/
#include <kernel/taskmgr.H>
#include <arch/ppc.H>
#include <sys/syscall.h>
using namespace Systemcalls;
void* TaskManager::idleTaskLoop(void* unused)
{
while(1)
{
// Lower priority (and yield simics thread).
setThreadPriorityLow();
// Request privilege escalation for nap.
asm volatile("li 3, %0; sc" :: "K" (MISC_CPUNAP) : "r3", "cc");
// Execute nap.
nap();
}
return NULL;
}
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