This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / kernel / idle_64.c

diff --git a/arch/powerpc/kernel/idle_64.c b/arch/powerpc/kernel/idle_64.c
new file mode 100644 (file)
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+++ b/arch/powerpc/kernel/idle_64.c
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+/*
+ * Idle daemon for PowerPC.  Idle daemon will handle any action
+ * that needs to be taken when the system becomes idle.
+ *
+ * Originally Written by Cort Dougan (cort@cs.nmt.edu)
+ *
+ * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com>
+ *
+ * Additional shared processor, SMT, and firmware support
+ *    Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com>
+ *
+ * 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/sched.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/cpu.h>
+#include <linux/sysctl.h>
+
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/cputable.h>
+#include <asm/time.h>
+#include <asm/machdep.h>
+#include <asm/smp.h>
+
+extern void power4_idle(void);
+
+void default_idle(void)
+{
+       unsigned int cpu = smp_processor_id();
+       set_thread_flag(TIF_POLLING_NRFLAG);
+
+       while (1) {
+               if (!need_resched()) {
+                       while (!need_resched() && !cpu_is_offline(cpu)) {
+                               ppc64_runlatch_off();
+
+                               /*
+                                * Go into low thread priority and possibly
+                                * low power mode.
+                                */
+                               HMT_low();
+                               HMT_very_low();
+                       }
+
+                       HMT_medium();
+               }
+
+               ppc64_runlatch_on();
+               preempt_enable_no_resched();
+               schedule();
+               preempt_disable();
+               if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
+                       cpu_die();
+       }
+}
+
+void native_idle(void)
+{
+       while (1) {
+               ppc64_runlatch_off();
+
+               if (!need_resched())
+                       power4_idle();
+
+               if (need_resched()) {
+                       ppc64_runlatch_on();
+                       preempt_enable_no_resched();
+                       schedule();
+                       preempt_disable();
+               }
+
+               if (cpu_is_offline(smp_processor_id()) &&
+                   system_state == SYSTEM_RUNNING)
+                       cpu_die();
+       }
+}
+
+void cpu_idle(void)
+{
+       BUG_ON(NULL == ppc_md.idle_loop);
+       ppc_md.idle_loop();
+}
+
+int powersave_nap;
+
+#ifdef CONFIG_SYSCTL
+/*
+ * Register the sysctl to set/clear 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