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authorPaul Mackerras <paulus@samba.org>2005-11-18 15:43:34 +1100
committerPaul Mackerras <paulus@samba.org>2005-11-18 15:43:34 +1100
commit437a58db57c61385baaa1cb8b7fa590b6a2f1607 (patch)
tree3b25862dccdfd891b0d8582ff7b98b1db9f197f7 /arch/powerpc/kernel/idle_64.c
parentf62859bb6871c5e4a8e591c60befc8caaf54db8c (diff)
powerpc: Move remaining .c files from arch/ppc64 to arch/powerpc
This also deletes the now-unused Makefiles under arch/ppc64. Both of the files moved over could use some merging, but for now I have moved them as-is and arranged for them to be used only in 64-bit kernels. For 32-bit kernels we still use arch/ppc/kernel/idle.c and drivers/char/generic_nvram.c as before. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/idle_64.c')
-rw-r--r--arch/powerpc/kernel/idle_64.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle_64.c b/arch/powerpc/kernel/idle_64.c
new file mode 100644
index 00000000000..b879d3057ef
--- /dev/null
+++ b/arch/powerpc/kernel/idle_64.c
@@ -0,0 +1,121 @@
+/*
+ * 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