Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | /* -*- mode: c; c-basic-offset: 8 -*- */
/* Copyright (C) 2001
*
* Author: J.E.J.Bottomley@HansenPartnership.com
*
* linux/arch/i386/kernel/voyager_thread.c
*
* This module provides the machine status monitor thread for the
* voyager architecture. This allows us to monitor the machine
* environment (temp, voltage, fan function) and the front panel and
* internal UPS. If a fault is detected, this thread takes corrective
* action (usually just informing init)
* */
#include <linux/module.h>
#include <linux/config.h>
#include <linux/mm.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
#include <linux/mc146818rtc.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/kmod.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <asm/desc.h>
#include <asm/voyager.h>
#include <asm/vic.h>
#include <asm/mtrr.h>
#include <asm/msr.h>
#define THREAD_NAME "kvoyagerd"
/* external variables */
int kvoyagerd_running = 0;
DECLARE_MUTEX_LOCKED(kvoyagerd_sem);
static int thread(void *);
static __u8 set_timeout = 0;
/* Start the machine monitor thread. Return 1 if OK, 0 if fail */
static int __init
voyager_thread_start(void)
{
if(kernel_thread(thread, NULL, CLONE_KERNEL) < 0) {
/* This is serious, but not fatal */
printk(KERN_ERR "Voyager: Failed to create system monitor thread!!!\n");
return 1;
}
return 0;
}
static int
execute(const char *string)
{
int ret;
char *envp[] = {
"HOME=/",
"TERM=linux",
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
NULL,
};
char *argv[] = {
"/bin/bash",
"-c",
(char *)string,
NULL,
};
if ((ret = call_usermodehelper(argv[0], argv, envp, 1)) != 0) {
printk(KERN_ERR "Voyager failed to run \"%s\": %i\n",
string, ret);
}
return ret;
}
static void
check_from_kernel(void)
{
if(voyager_status.switch_off) {
/* FIXME: This should be configureable via proc */
execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1");
} else if(voyager_status.power_fail) {
VDEBUG(("Voyager daemon detected AC power failure\n"));
/* FIXME: This should be configureable via proc */
execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1");
set_timeout = 1;
}
}
static void
check_continuing_condition(void)
{
if(voyager_status.power_fail) {
__u8 data;
voyager_cat_psi(VOYAGER_PSI_SUBREAD,
VOYAGER_PSI_AC_FAIL_REG, &data);
if((data & 0x1f) == 0) {
/* all power restored */
printk(KERN_NOTICE "VOYAGER AC power restored, cancelling shutdown\n");
/* FIXME: should be user configureable */
execute("umask 600; echo O > /etc/powerstatus; kill -PWR 1");
set_timeout = 0;
}
}
}
static void
wakeup(unsigned long unused)
{
up(&kvoyagerd_sem);
}
static int
thread(void *unused)
{
struct timer_list wakeup_timer;
kvoyagerd_running = 1;
daemonize(THREAD_NAME);
set_timeout = 0;
init_timer(&wakeup_timer);
sigfillset(¤t->blocked);
current->signal->tty = NULL;
printk(KERN_NOTICE "Voyager starting monitor thread\n");
for(;;) {
down_interruptible(&kvoyagerd_sem);
VDEBUG(("Voyager Daemon awoken\n"));
if(voyager_status.request_from_kernel == 0) {
/* probably awoken from timeout */
check_continuing_condition();
} else {
check_from_kernel();
voyager_status.request_from_kernel = 0;
}
if(set_timeout) {
del_timer(&wakeup_timer);
wakeup_timer.expires = HZ + jiffies;
wakeup_timer.function = wakeup;
add_timer(&wakeup_timer);
}
}
}
static void __exit
voyager_thread_stop(void)
{
/* FIXME: do nothing at the moment */
}
module_init(voyager_thread_start);
//module_exit(voyager_thread_stop);
|