101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
|
/*
|
||
|
|
* Idle daemon for PowerPC. Idle daemon will handle any action
|
||
|
|
* that needs to be taken when the system becomes idle.
|
||
|
|
*
|
||
|
|
* Written by Cort Dougan (cort@cs.nmt.edu). Subsequently hacked
|
||
|
|
* on by Tom Rini, Armin Kuster, Paul Mackerras and others.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the License, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
#include <linux/config.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/smp.h>
|
||
|
|
#include <linux/smp_lock.h>
|
||
|
|
#include <linux/stddef.h>
|
||
|
|
#include <linux/unistd.h>
|
||
|
|
#include <linux/ptrace.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/sysctl.h>
|
||
|
|
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
#include <asm/uaccess.h>
|
||
|
|
#include <asm/system.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/mmu.h>
|
||
|
|
#include <asm/cache.h>
|
||
|
|
#include <asm/cputable.h>
|
||
|
|
#include <asm/machdep.h>
|
||
|
|
|
||
|
|
void default_idle(void)
|
||
|
|
{
|
||
|
|
void (*powersave)(void);
|
||
|
|
|
||
|
|
powersave = ppc_md.power_save;
|
||
|
|
|
||
|
|
if (!need_resched()) {
|
||
|
|
if (powersave != NULL)
|
||
|
|
powersave();
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
else {
|
||
|
|
set_thread_flag(TIF_POLLING_NRFLAG);
|
||
|
|
while (!need_resched())
|
||
|
|
barrier();
|
||
|
|
clear_thread_flag(TIF_POLLING_NRFLAG);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
if (need_resched())
|
||
|
|
schedule();
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The body of the idle task.
|
||
|
|
*/
|
||
|
|
void cpu_idle(void)
|
||
|
|
{
|
||
|
|
for (;;)
|
||
|
|
if (ppc_md.idle != NULL)
|
||
|
|
ppc_md.idle();
|
||
|
|
else
|
||
|
|
default_idle();
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined(CONFIG_SYSCTL) && defined(CONFIG_6xx)
|
||
|
|
/*
|
||
|
|
* Register the sysctl to set/clear powersave_nap.
|
||
|
|
*/
|
||
|
|
extern unsigned long powersave_nap;
|
||
|
|
|
||
|
|
static ctl_table powersave_nap_ctl_table[]={
|
||
|
|
{
|
||
|
|
.ctl_name = KERN_PPC_POWERSAVE_NAP,
|
||
|
|
.procname = "powersave-nap",
|
||
|
|
.data = &powersave_nap,
|
||
|
|
.maxlen = sizeof(int),
|
||
|
|
.mode = 0644,
|
||
|
|
.proc_handler = &proc_dointvec,
|
||
|
|
},
|
||
|
|
{ 0, },
|
||
|
|
};
|
||
|
|
static ctl_table powersave_nap_sysctl_root[] = {
|
||
|
|
{ 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, },
|
||
|
|
{ 0,},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init
|
||
|
|
register_powersave_nap_sysctl(void)
|
||
|
|
{
|
||
|
|
register_sysctl_table(powersave_nap_sysctl_root, 0);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
__initcall(register_powersave_nap_sysctl);
|
||
|
|
#endif
|