mirror of https://gitee.com/openkylin/linux.git
131 lines
3.0 KiB
C
131 lines
3.0 KiB
C
/* -*- mode: c; c-basic-offset: 8 -*- */
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/* Copyright (C) 2001
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*
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* Author: J.E.J.Bottomley@HansenPartnership.com
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*
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* linux/arch/i386/kernel/voyager_thread.c
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*
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* This module provides the machine status monitor thread for the
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* voyager architecture. This allows us to monitor the machine
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* environment (temp, voltage, fan function) and the front panel and
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* internal UPS. If a fault is detected, this thread takes corrective
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* action (usually just informing init)
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* */
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/kernel_stat.h>
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#include <linux/delay.h>
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#include <linux/mc146818rtc.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/kmod.h>
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#include <linux/completion.h>
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#include <linux/sched.h>
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#include <linux/kthread.h>
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#include <asm/desc.h>
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#include <asm/voyager.h>
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#include <asm/vic.h>
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#include <asm/mtrr.h>
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#include <asm/msr.h>
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struct task_struct *voyager_thread;
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static __u8 set_timeout;
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static int execute(const char *string)
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{
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int ret;
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char *envp[] = {
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"HOME=/",
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"TERM=linux",
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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NULL,
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};
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char *argv[] = {
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"/bin/bash",
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"-c",
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(char *)string,
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NULL,
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};
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if ((ret =
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call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC)) != 0) {
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printk(KERN_ERR "Voyager failed to run \"%s\": %i\n", string,
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ret);
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}
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return ret;
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}
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static void check_from_kernel(void)
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{
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if (voyager_status.switch_off) {
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/* FIXME: This should be configurable via proc */
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execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1");
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} else if (voyager_status.power_fail) {
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VDEBUG(("Voyager daemon detected AC power failure\n"));
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/* FIXME: This should be configureable via proc */
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execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1");
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set_timeout = 1;
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}
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}
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static void check_continuing_condition(void)
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{
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if (voyager_status.power_fail) {
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__u8 data;
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voyager_cat_psi(VOYAGER_PSI_SUBREAD,
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VOYAGER_PSI_AC_FAIL_REG, &data);
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if ((data & 0x1f) == 0) {
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/* all power restored */
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printk(KERN_NOTICE
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"VOYAGER AC power restored, cancelling shutdown\n");
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/* FIXME: should be user configureable */
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execute
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("umask 600; echo O > /etc/powerstatus; kill -PWR 1");
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set_timeout = 0;
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}
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}
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}
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static int thread(void *unused)
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{
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printk(KERN_NOTICE "Voyager starting monitor thread\n");
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for (;;) {
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set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(set_timeout ? HZ : MAX_SCHEDULE_TIMEOUT);
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VDEBUG(("Voyager Daemon awoken\n"));
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if (voyager_status.request_from_kernel == 0) {
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/* probably awoken from timeout */
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check_continuing_condition();
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} else {
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check_from_kernel();
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voyager_status.request_from_kernel = 0;
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}
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}
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}
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static int __init voyager_thread_start(void)
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{
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voyager_thread = kthread_run(thread, NULL, "kvoyagerd");
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if (IS_ERR(voyager_thread)) {
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printk(KERN_ERR
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"Voyager: Failed to create system monitor thread.\n");
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return PTR_ERR(voyager_thread);
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}
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return 0;
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}
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static void __exit voyager_thread_stop(void)
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{
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kthread_stop(voyager_thread);
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}
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module_init(voyager_thread_start);
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module_exit(voyager_thread_stop);
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