ia64/linux-2.6.18-xen.hg

view kernel/power/poweroff.c @ 798:b02a90bf5bbc

ACPI: Backport missing part for T-State MSR support

Part of below kernel commit was missed while packporting T-State
support.

commit f79f06ab9f86d7203006d2ec8992ac80df36a34e
Author: Zhao Yakui <yakui.zhao@intel.com>
Date: Thu Nov 15 17:06:36 2007 +0800

ACPI: Enable MSR (FixedHW) support for T-States

Add throttling control via MSR when T-states uses
the FixHW Control Status registers.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

Signed-off-by: Wei Gang <gang.wei@intel.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Mar 02 10:53:59 2009 +0000 (2009-03-02)
parents 831230e53067
children
line source
1 /*
2 * poweroff.c - sysrq handler to gracefully power down machine.
3 *
4 * This file is released under the GPL v2
5 */
7 #include <linux/kernel.h>
8 #include <linux/sysrq.h>
9 #include <linux/init.h>
10 #include <linux/pm.h>
11 #include <linux/workqueue.h>
12 #include <linux/reboot.h>
14 /*
15 * When the user hits Sys-Rq o to power down the machine this is the
16 * callback we use.
17 */
19 static void do_poweroff(void *dummy)
20 {
21 kernel_power_off();
22 }
24 static DECLARE_WORK(poweroff_work, do_poweroff, NULL);
26 static void handle_poweroff(int key, struct pt_regs *pt_regs,
27 struct tty_struct *tty)
28 {
29 schedule_work(&poweroff_work);
30 }
32 static struct sysrq_key_op sysrq_poweroff_op = {
33 .handler = handle_poweroff,
34 .help_msg = "powerOff",
35 .action_msg = "Power Off",
36 .enable_mask = SYSRQ_ENABLE_BOOT,
37 };
39 static int pm_sysrq_init(void)
40 {
41 register_sysrq_key('o', &sysrq_poweroff_op);
42 return 0;
43 }
45 subsys_initcall(pm_sysrq_init);