/* * 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