/*
* The real-time timer, interrupting hz times per second.
*/
void
hardclock(struct clockframe *frame)
{
struct proc *p;
struct cpu_info *ci = curcpu();
p = curproc;
if (p && ((p->p_flag & (P_SYSTEM | P_WEXIT)) == 0)) {
struct process *pr = p->p_p;
/*
* Run current process's virtual and profile time, as needed.
*/
if (CLKF_USERMODE(frame) &&
timerisset(&pr->ps_timer[ITIMER_VIRTUAL].it_value) &&
itimerdecr(&pr->ps_timer[ITIMER_VIRTUAL], tick) == 0) {
atomic_setbits_int(&p->p_flag, P_ALRMPEND);
need_proftick(p);
}
if (timerisset(&pr->ps_timer[ITIMER_PROF].it_value) &&
itimerdecr(&pr->ps_timer[ITIMER_PROF], tick) == 0) {
atomic_setbits_int(&p->p_flag, P_PROFPEND);
need_proftick(p);
}
}
/*
* If no separate statistics clock is available, run it from here.
*/
if (stathz == 0)
statclock(frame);
if (--ci->ci_schedstate.spc_rrticks <= 0)
roundrobin(ci);
/*
* If we are not the primary CPU, we're not allowed to do
* any more work.
*/
if (CPU_IS_PRIMARY(ci) == 0)
return;
tc_ticktock();
ticks++;
/*
* Update real-time timeout queue.
* Process callouts at a very low cpu priority, so we don't keep the
* relatively high clock interrupt priority any longer than necessary.
*/
if (timeout_hardclock_update())
softintr_schedule(softclock_si);
}
/*
* Collect user-level profiling statistics; called on a profiling tick,
* when a process is running in user-mode. This routine may be called
* from an interrupt context. Schedule an AST that will vector us to
* trap() with a context in which copyin and copyout will work.
* Trap will then call addupc_task().
*/
void
addupc_intr(struct proc *p, u_long pc)
{
struct uprof *prof;
prof = &p->p_p->ps_prof;
if (pc < prof->pr_off || PC_TO_INDEX(pc, prof) >= prof->pr_size)
return; /* out of range; ignore */
p->p_prof_addr = pc;
p->p_prof_ticks++;
atomic_setbits_int(&p->p_flag, P_OWEUPC);
need_proftick(p);
}
