/*
* The real-time timer, interrupting hz times per second.
*/
void
uinet_hardclock(void)
{
atomic_add_int((volatile int *)&ticks, 1);
/* hardclock_cpu(usermode);
*
* There is no need for the process accounting done in
* hardclock_cpu(). We only need the callout_tick() call, which is
* reproduced below.
*/
callout_tick();
tc_ticktock(1);
/* cpu_tick_calibration();
*
* There is no need for cpu_tick_calibration(), as we are operating
* as a fixed-rate ticker.
*/
/*
* If no separate statistics clock is available, run it from here.
*
* XXX: this only works for UP
*/
/* if (stathz == 0) {
* profclock(usermode, pc);
* statclock(usermode);
* }
*
* No need for profclock or statclock support.
*/
#ifndef UINET /* No DEVICE_POLLING or SW_WATCHDOG support under UINET */
#ifdef DEVICE_POLLING
hardclock_device_poll(); /* this is very short and quick */
#endif /* DEVICE_POLLING */
#ifdef SW_WATCHDOG
if (watchdog_enabled > 0 && --watchdog_ticks <= 0)
watchdog_fire();
#endif /* SW_WATCHDOG */
#endif /* UINET */
}
static int intel_scu_release(struct inode *inode, struct file *file)
{
/*
* This watchdog should not be closed, after the timer
* is started with the WDIPC_SETTIMEOUT ioctl
* If force_boot is set watchdog_fire() will cause an
* immediate reset. If force_boot is not set, the watchdog
* timer is refreshed for one more interval. At the end
* of that interval, the watchdog timer will reset the system.
*/
if (!test_and_clear_bit(0, &watchdog_device.driver_open)) {
pr_debug("Watchdog timer: intel_scu_release, without open\n");
return -ENOTTY;
}
if (!watchdog_device.timer_started) {
/* Just close, since timer has not been started */
pr_debug("Watchdog timer: closed, without starting timer\n");
return 0;
}
#ifdef CONFIG_DEBUG_PRINTK
printk(KERN_CRIT PFX
"Unexpected close of /dev/watchdog!\n");
#else
;
#endif
/* Since the timer was started, prevent future reopens */
watchdog_device.driver_closed = 1;
/* Refresh the timer for one more interval */
intel_scu_keepalive();
/* Reboot system (if force_boot is set) */
watchdog_fire();
/* We should only reach this point if force_boot is not set */
return 0;
}
