/*
* Level 10 (clock) interrupts from system counter.
*/
int
clockintr_4m(void *cap)
{
/*
* XXX this needs to be fixed in a more general way
* problem is that the kernel enables interrupts and THEN
* sets up clocks. In between there's an opportunity to catch
* a timer interrupt - if we call hardclock() at that point we'll
* panic
* so for now just bail when cold
*
* For MP, we defer calling hardclock() to the schedintr so
* that we call it on all cpus.
*/
if (cold)
return 0;
kpreempt_disable();
/* read the limit register to clear the interrupt */
*((volatile int *)&timerreg4m->t_limit);
tickle_tc();
/*
* We don't have a system-clock per-cpu, and we'd like to keep
* the per-cpu timer for the statclock, so, send an IPI to
* everyone to call hardclock.
*/
handle_hardclock(cap);
kpreempt_enable();
return (1);
}
int
clockhandler(void *cookie)
{
struct clockframe *frame = cookie;
tickle_tc();
hardclock(frame);
return 0; /* Pass the interrupt on down the chain */
}
/*
* Level 10 (clock) interrupts from system counter.
*/
int
clockintr_4(void *cap)
{
/* read the limit register to clear the interrupt */
*((volatile int *)&timerreg4->t_c10.t_limit);
tickle_tc();
hardclock((struct clockframe *)cap);
return (1);
}