164 lines
3.5 KiB
C
164 lines
3.5 KiB
C
/* -*- 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/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);
|