1 // SPDX-License-Identifier: GPL-2.0 <<
2 /* 1 /*
3 * The idle loop for all SuperH platforms. !! 2 * Idle daemon for PowerPC. Idle daemon will handle any action
>> 3 * that needs to be taken when the system becomes idle.
4 * 4 *
5 * Copyright (C) 2002 - 2009 Paul Mundt !! 5 * Written by Cort Dougan (cort@cs.nmt.edu)
>> 6 *
>> 7 * This program is free software; you can redistribute it and/or
>> 8 * modify it under the terms of the GNU General Public License
>> 9 * as published by the Free Software Foundation; either version
>> 10 * 2 of the License, or (at your option) any later version.
6 */ 11 */
7 #include <linux/cpu.h> !! 12 #include <linux/config.h>
8 #include <linux/module.h> !! 13 #include <linux/errno.h>
9 #include <linux/init.h> !! 14 #include <linux/sched.h>
>> 15 #include <linux/kernel.h>
10 #include <linux/mm.h> 16 #include <linux/mm.h>
11 #include <linux/pm.h> <<
12 #include <linux/tick.h> <<
13 #include <linux/preempt.h> <<
14 #include <linux/thread_info.h> <<
15 #include <linux/irqflags.h> <<
16 #include <linux/smp.h> 17 #include <linux/smp.h>
17 #include <linux/atomic.h> !! 18 #include <linux/smp_lock.h>
>> 19 #include <linux/stddef.h>
>> 20 #include <linux/unistd.h>
>> 21 #include <linux/ptrace.h>
>> 22 #include <linux/slab.h>
>> 23
>> 24 #include <asm/pgtable.h>
>> 25 #include <asm/uaccess.h>
>> 26 #include <asm/system.h>
>> 27 #include <asm/io.h>
18 #include <asm/processor.h> 28 #include <asm/processor.h>
19 #include <asm/smp.h> !! 29 #include <asm/mmu.h>
20 #include <asm/bl_bit.h> !! 30 #include <asm/cache.h>
>> 31 #include <asm/cputable.h>
21 32
22 static void (*sh_idle)(void); !! 33 unsigned long zero_paged_on;
>> 34 unsigned long powersave_nap;
>> 35 unsigned long powersave_lowspeed;
23 36
24 void default_idle(void) !! 37 extern void power_save(void);
25 { <<
26 set_bl_bit(); <<
27 raw_local_irq_enable(); <<
28 /* Isn't this racy ? */ <<
29 cpu_sleep(); <<
30 raw_local_irq_disable(); <<
31 clear_bl_bit(); <<
32 } <<
33 38
34 void __noreturn arch_cpu_idle_dead(void) !! 39 int idled(void)
35 { 40 {
36 play_dead(); !! 41 int do_power_save = 0;
37 } <<
38 42
39 void arch_cpu_idle(void) !! 43 /* Check if CPU can powersave (get rid of that soon!) */
40 { !! 44 if (cur_cpu_spec[smp_processor_id()]->cpu_features &
41 sh_idle(); !! 45 (CPU_FTR_CAN_DOZE | CPU_FTR_CAN_NAP))
>> 46 do_power_save = 1;
>> 47
>> 48 /* endless loop with no priority at all */
>> 49 current->nice = 20;
>> 50 current->counter = -100;
>> 51 init_idle();
>> 52 for (;;) {
>> 53 #ifdef CONFIG_SMP
>> 54 if (!do_power_save) {
>> 55 /*
>> 56 * Deal with another CPU just having chosen a thread to
>> 57 * run here:
>> 58 */
>> 59 int oldval = xchg(¤t->need_resched, -1);
>> 60
>> 61 if (!oldval) {
>> 62 while(current->need_resched == -1)
>> 63 ; /* Do Nothing */
>> 64 }
>> 65 }
>> 66 #endif
>> 67 if (do_power_save && !current->need_resched)
>> 68 power_save();
>> 69
>> 70 if (current->need_resched) {
>> 71 schedule();
>> 72 check_pgt_cache();
>> 73 }
>> 74 }
>> 75 return 0;
42 } 76 }
43 77
44 void __init select_idle_routine(void) !! 78 /*
45 { !! 79 * SMP entry into the idle task - calls the same thing as the
46 /* !! 80 * non-smp versions. -- Cort
47 * If a platform has set its own idle !! 81 */
48 */ !! 82 int cpu_idle(void)
49 if (!sh_idle) <<
50 sh_idle = default_idle; <<
51 } <<
52 <<
53 void stop_this_cpu(void *unused) <<
54 { 83 {
55 local_irq_disable(); !! 84 idled();
56 set_cpu_online(smp_processor_id(), fal !! 85 return 0;
57 <<
58 for (;;) <<
59 cpu_sleep(); <<
60 } 86 }
61 87
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