示例#1
0
文件: intr.c 项目: chrmorais/miniemc2
void xnintr_clock_handler(void)
{
	struct xnsched *sched = xnpod_current_sched();
	xnstat_exectime_t *prev;
	xnticks_t start;

	prev  = xnstat_exectime_get_current(sched);
	start = xnstat_exectime_now();

	xnarch_announce_tick();

	trace_mark(xn_nucleus, irq_enter, "irq %u", XNARCH_TIMER_IRQ);
	trace_mark(xn_nucleus, tbase_tick, "base %s", nktbase.name);

	++sched->inesting;
	__setbits(sched->lflags, XNINIRQ);

	xnlock_get(&nklock);
	xntimer_tick_aperiodic();
	xnlock_put(&nklock);

	xnstat_counter_inc(&nkclock.stat[xnsched_cpu(sched)].hits);
	xnstat_exectime_lazy_switch(sched,
		&nkclock.stat[xnsched_cpu(sched)].account, start);

	if (--sched->inesting == 0) {
		__clrbits(sched->lflags, XNINIRQ);
		xnpod_schedule();
	}
	/*
	 * If the clock interrupt preempted a real-time thread, any
	 * transition to the root thread has already triggered a host
	 * tick propagation from xnpod_schedule(), so at this point,
	 * we only need to propagate the host tick in case the
	 * interrupt preempted the root thread.
	 */
	if (testbits(sched->lflags, XNHTICK) &&
	    xnthread_test_state(sched->curr, XNROOT))
		xnintr_host_tick(sched);

	trace_mark(xn_nucleus, irq_exit, "irq %u", XNARCH_TIMER_IRQ);
	xnstat_exectime_switch(sched, prev);
}
示例#2
0
/*
 * Low-level interrupt handler dispatching non-shared ISRs -- Called with
 * interrupts off.
 */
static void xnintr_irq_handler(unsigned irq, void *cookie)
{
	struct xnsched *sched = xnpod_current_sched();
	xnstat_exectime_t *prev;
	struct xnintr *intr;
	xnticks_t start;
	int s;

	prev  = xnstat_exectime_get_current(sched);
	start = xnstat_exectime_now();
	trace_mark(xn_nucleus, irq_enter, "irq %u", irq);

	++sched->inesting;
	__setbits(sched->lflags, XNINIRQ);

	xnlock_get(&xnirqs[irq].lock);

#ifdef CONFIG_SMP
	/*
	 * In SMP case, we have to reload the cookie under the per-IRQ
	 * lock to avoid racing with xnintr_detach.  However, we
	 * assume that no CPU migration will occur while running the
	 * interrupt service routine, so the scheduler pointer will
	 * remain valid throughout this function.
	 */
	intr = xnarch_get_irq_cookie(irq);
	if (unlikely(!intr)) {
		s = 0;
		goto unlock_and_exit;
	}
#else
	/* cookie always valid, attach/detach happens with IRQs disabled */
	intr = cookie;
#endif
	s = intr->isr(intr);
	if (unlikely(s == XN_ISR_NONE)) {
		if (++intr->unhandled == XNINTR_MAX_UNHANDLED) {
			xnlogerr("%s: IRQ%d not handled. Disabling IRQ "
				 "line.\n", __FUNCTION__, irq);
			s |= XN_ISR_NOENABLE;
		}
	} else {
		xnstat_counter_inc(&intr->stat[xnsched_cpu(sched)].hits);
		xnstat_exectime_lazy_switch(sched,
			&intr->stat[xnsched_cpu(sched)].account,
			start);
		intr->unhandled = 0;
	}

#ifdef CONFIG_SMP
 unlock_and_exit:
#endif
	xnlock_put(&xnirqs[irq].lock);

	if (s & XN_ISR_PROPAGATE)
		xnarch_chain_irq(irq);
	else if (!(s & XN_ISR_NOENABLE))
		xnarch_end_irq(irq);

	xnstat_exectime_switch(sched, prev);

	if (--sched->inesting == 0) {
		__clrbits(sched->lflags, XNINIRQ);
		xnpod_schedule();
	}

	trace_mark(xn_nucleus, irq_exit, "irq %u", irq);
}
示例#3
0
/*
 * Low-level interrupt handler dispatching the user-defined ISRs for
 * shared edge-triggered interrupts -- Called with interrupts off.
 */
static void xnintr_edge_shirq_handler(unsigned irq, void *cookie)
{
	const int MAX_EDGEIRQ_COUNTER = 128;
	struct xnsched *sched = xnpod_current_sched();
	xnintr_irq_t *shirq = &xnirqs[irq];
	int s = 0, counter = 0, ret, code;
	struct xnintr *intr, *end = NULL;
	xnstat_exectime_t *prev;
	xnticks_t start;

	prev  = xnstat_exectime_get_current(sched);
	start = xnstat_exectime_now();
	trace_mark(xn_nucleus, irq_enter, "irq %u", irq);

	++sched->inesting;
	__setbits(sched->lflags, XNINIRQ);

	xnlock_get(&shirq->lock);
	intr = shirq->handlers;

	while (intr != end) {
		xnstat_exectime_switch(sched,
			&intr->stat[xnsched_cpu(sched)].account);
		/*
		 * NOTE: We assume that no CPU migration will occur
		 * while running the interrupt service routine.
		 */
		ret = intr->isr(intr);
		code = ret & ~XN_ISR_BITMASK;
		s |= ret;

		if (code == XN_ISR_HANDLED) {
			end = NULL;
			xnstat_counter_inc(
				&intr->stat[xnsched_cpu(sched)].hits);
			xnstat_exectime_lazy_switch(sched,
				&intr->stat[xnsched_cpu(sched)].account,
				start);
			start = xnstat_exectime_now();
		} else if (end == NULL)
			end = intr;

		if (counter++ > MAX_EDGEIRQ_COUNTER)
			break;

		if (!(intr = intr->next))
			intr = shirq->handlers;
	}

	xnlock_put(&shirq->lock);

	if (counter > MAX_EDGEIRQ_COUNTER)
		xnlogerr
		    ("xnintr_edge_shirq_handler() : failed to get the IRQ%d line free.\n",
		     irq);

	if (unlikely(s == XN_ISR_NONE)) {
		if (++shirq->unhandled == XNINTR_MAX_UNHANDLED) {
			xnlogerr("%s: IRQ%d not handled. Disabling IRQ "
				 "line.\n", __FUNCTION__, irq);
			s |= XN_ISR_NOENABLE;
		}
	} else
		shirq->unhandled = 0;

	if (s & XN_ISR_PROPAGATE)
		xnarch_chain_irq(irq);
	else if (!(s & XN_ISR_NOENABLE))
		xnarch_end_irq(irq);

	xnstat_exectime_switch(sched, prev);

	if (--sched->inesting == 0) {
		__clrbits(sched->lflags, XNINIRQ);
		xnpod_schedule();
	}

	trace_mark(xn_nucleus, irq_exit, "irq %u", irq);
}
示例#4
0
/*
 * Low-level interrupt handler dispatching the user-defined ISRs for
 * shared interrupts -- Called with interrupts off.
 */
static void xnintr_shirq_handler(unsigned irq, void *cookie)
{
	struct xnsched *sched = xnpod_current_sched();
	xnintr_irq_t *shirq = &xnirqs[irq];
	xnstat_exectime_t *prev;
	xnticks_t start;
	xnintr_t *intr;
	int s = 0, ret;

	prev  = xnstat_exectime_get_current(sched);
	start = xnstat_exectime_now();
	trace_mark(xn_nucleus, irq_enter, "irq %u", irq);

	++sched->inesting;
	__setbits(sched->status, XNINIRQ);

	xnlock_get(&shirq->lock);
	intr = shirq->handlers;

	while (intr) {
		/*
		 * NOTE: We assume that no CPU migration will occur
		 * while running the interrupt service routine.
		 */
		ret = intr->isr(intr);
		s |= ret;

		if (ret & XN_ISR_HANDLED) {
			xnstat_counter_inc(
				&intr->stat[xnsched_cpu(sched)].hits);
			xnstat_exectime_lazy_switch(sched,
				&intr->stat[xnsched_cpu(sched)].account,
				start);
			start = xnstat_exectime_now();
		}

		intr = intr->next;
	}

	xnlock_put(&shirq->lock);

	if (unlikely(s == XN_ISR_NONE)) {
		if (++shirq->unhandled == XNINTR_MAX_UNHANDLED) {
			xnlogerr("%s: IRQ%d not handled. Disabling IRQ "
				 "line.\n", __FUNCTION__, irq);
			s |= XN_ISR_NOENABLE;
		}
	} else
		shirq->unhandled = 0;

	if (s & XN_ISR_PROPAGATE)
		xnarch_chain_irq(irq);
	else if (!(s & XN_ISR_NOENABLE))
		xnarch_end_irq(irq);

	if (--sched->inesting == 0) {
		__clrbits(sched->status, XNINIRQ);
		xnpod_schedule();
	}

	trace_mark(xn_nucleus, irq_exit, "irq %u", irq);
	xnstat_exectime_switch(sched, prev);
}