1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*
* 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 <linux/cpu.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>
#include <asm/smp.h>
void default_idle(void)
{
void (*powersave)(void);
int cpu = smp_processor_id();
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() && !cpu_is_offline(cpu))
barrier();
clear_thread_flag(TIF_POLLING_NRFLAG);
}
#endif
}
}
/*
* The body of the idle task.
*/
void cpu_idle(void)
{
int cpu = smp_processor_id();
for (;;) {
while (need_resched()) {
if (ppc_md.idle != NULL)
ppc_md.idle();
else
default_idle();
}
if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
cpu_die();
preempt_enable_no_resched();
schedule();
preempt_disable();
}
}
#if defined(CONFIG_SYSCTL) && defined(CONFIG_6xx)
/*
* Register the sysctl to set/clear powersave_nap.
*/
extern int 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
|
