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). Subsequently hacked
>> 6 * on by Tom Rini, Armin Kuster, Paul Mackerras and others.
>> 7 *
>> 8 * This program is free software; you can redistribute it and/or
>> 9 * modify it under the terms of the GNU General Public License
>> 10 * as published by the Free Software Foundation; either version
>> 11 * 2 of the License, or (at your option) any later version.
6 */ 12 */
7 #include <linux/cpu.h> !! 13 #include <linux/config.h>
8 #include <linux/module.h> !! 14 #include <linux/errno.h>
9 #include <linux/init.h> !! 15 #include <linux/sched.h>
>> 16 #include <linux/kernel.h>
10 #include <linux/mm.h> 17 #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> 18 #include <linux/smp.h>
17 #include <linux/atomic.h> !! 19 #include <linux/smp_lock.h>
18 #include <asm/processor.h> !! 20 #include <linux/stddef.h>
19 #include <asm/smp.h> !! 21 #include <linux/unistd.h>
20 #include <asm/bl_bit.h> !! 22 #include <linux/ptrace.h>
21 !! 23 #include <linux/slab.h>
22 static void (*sh_idle)(void); !! 24
>> 25 #include <asm/pgtable.h>
>> 26 #include <asm/uaccess.h>
>> 27 #include <asm/system.h>
>> 28 #include <asm/io.h>
>> 29 #include <asm/mmu.h>
>> 30 #include <asm/cache.h>
>> 31 #include <asm/cputable.h>
>> 32 #include <asm/machdep.h>
23 33
24 void default_idle(void) 34 void default_idle(void)
25 { 35 {
26 set_bl_bit(); !! 36 void (*powersave)(void);
27 raw_local_irq_enable(); <<
28 /* Isn't this racy ? */ <<
29 cpu_sleep(); <<
30 raw_local_irq_disable(); <<
31 clear_bl_bit(); <<
32 } <<
33 <<
34 void __noreturn arch_cpu_idle_dead(void) <<
35 { <<
36 play_dead(); <<
37 } <<
38 37
39 void arch_cpu_idle(void) !! 38 powersave = ppc_md.power_save;
40 { <<
41 sh_idle(); <<
42 } <<
43 39
44 void __init select_idle_routine(void) !! 40 if (!need_resched()) {
45 { !! 41 if (powersave != NULL)
46 /* !! 42 powersave();
47 * If a platform has set its own idle !! 43 #ifdef CONFIG_SMP
48 */ !! 44 else {
49 if (!sh_idle) !! 45 set_thread_flag(TIF_POLLING_NRFLAG);
50 sh_idle = default_idle; !! 46 while (!need_resched())
>> 47 barrier();
>> 48 clear_thread_flag(TIF_POLLING_NRFLAG);
>> 49 }
>> 50 #endif
>> 51 }
>> 52 if (need_resched())
>> 53 schedule();
51 } 54 }
52 55
53 void stop_this_cpu(void *unused) !! 56 /*
>> 57 * The body of the idle task.
>> 58 */
>> 59 int cpu_idle(void)
54 { 60 {
55 local_irq_disable(); <<
56 set_cpu_online(smp_processor_id(), fal <<
57 <<
58 for (;;) 61 for (;;)
59 cpu_sleep(); !! 62 if (ppc_md.idle != NULL)
>> 63 ppc_md.idle();
>> 64 else
>> 65 default_idle();
>> 66 return 0;
60 } 67 }
61 68
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