Exemplo n.º 1
0
Arquivo: time.c Projeto: 4atty/linux
static inline irqreturn_t
timer_interrupt(int irq, void *dev_id)
{
	struct pt_regs *regs = get_irq_regs();
	/* acknowledge the timer irq */

#ifdef USE_CASCADE_TIMERS
	*R_TIMER_CTRL =
		IO_FIELD( R_TIMER_CTRL, timerdiv1, 0) |
		IO_FIELD( R_TIMER_CTRL, timerdiv0, 0) |
		IO_STATE( R_TIMER_CTRL, i1, clr) |
		IO_STATE( R_TIMER_CTRL, tm1, run) |
		IO_STATE( R_TIMER_CTRL, clksel1, cascade0) |
		IO_STATE( R_TIMER_CTRL, i0, clr) |
		IO_STATE( R_TIMER_CTRL, tm0, run) |
		IO_STATE( R_TIMER_CTRL, clksel0, c6250kHz);
#else
	*R_TIMER_CTRL = r_timer_ctrl_shadow | 
		IO_STATE(R_TIMER_CTRL, i0, clr);
#endif

	/* reset watchdog otherwise it resets us! */
	reset_watchdog();
	
	/* Update statistics. */
	update_process_times(user_mode(regs));

	/* call the real timer interrupt handler */

	xtime_update(1);
	
        cris_do_profile(regs); /* Save profiling information */
        return IRQ_HANDLED;
}
Exemplo n.º 2
0
irqreturn_t timer_interrupt (int irq, void *dev_id)
{

	unsigned long next;

	next = get_linux_timer();

again:
	while ((signed long)(get_ccount() - next) > 0) {

		profile_tick(CPU_PROFILING);
#ifndef CONFIG_SMP
		update_process_times(user_mode(get_irq_regs()));
#endif

		xtime_update(1); /*                                          */

		/*                                                  */

		next += CCOUNT_PER_JIFFY;
		set_linux_timer(next);
	}

	/*                                               */

	platform_heartbeat();

	/*                                      */

	if ((signed long)(get_ccount() - next) > 0)
		goto again;

	return IRQ_HANDLED;
}
Exemplo n.º 3
0
/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "xtime_update()" routine every clocktick
 */
static irqreturn_t timer_interrupt(int irq, void *dummy)
{
	xtime_update(1);
	update_process_times(user_mode(get_irq_regs()));
	profile_tick(CPU_PROFILING);

#ifdef CONFIG_HEARTBEAT
	/* use power LED as a heartbeat instead -- much more useful
	   for debugging -- based on the version for PReP by Cort */
	/* acts like an actual heart beat -- ie thump-thump-pause... */
	if (mach_heartbeat) {
	    static unsigned cnt = 0, period = 0, dist = 0;

	    if (cnt == 0 || cnt == dist)
		mach_heartbeat( 1 );
	    else if (cnt == 7 || cnt == dist+7)
		mach_heartbeat( 0 );

	    if (++cnt > period) {
		cnt = 0;
		/* The hyperbolic function below modifies the heartbeat period
		 * length in dependency of the current (5min) load. It goes
		 * through the points f(0)=126, f(1)=86, f(5)=51,
		 * f(inf)->30. */
		period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
		dist = period / 4;
	    }
	}
#endif /* CONFIG_HEARTBEAT */
	return IRQ_HANDLED;
}
Exemplo n.º 4
0
irqreturn_t timer_interrupt (int irq, void *dev_id)
{

	unsigned long next;

	next = get_linux_timer();

again:
	while ((signed long)(get_ccount() - next) > 0) {

		profile_tick(CPU_PROFILING);
#ifndef CONFIG_SMP
		update_process_times(user_mode(get_irq_regs()));
#endif

		xtime_update(1); /* Linux handler in kernel/time/timekeeping */

		/* Note that writing CCOMPARE clears the interrupt. */

		next += CCOUNT_PER_JIFFY;
		set_linux_timer(next);
	}

	/* Allow platform to do something useful (Wdog). */

	platform_heartbeat();

	/* Make sure we didn't miss any tick... */

	if ((signed long)(get_ccount() - next) > 0)
		goto again;

	return IRQ_HANDLED;
}
Exemplo n.º 5
0
static irqreturn_t timer_interrupt(int irq, void *dummy)
{
	xtime_update(1);
	update_process_times(user_mode(get_irq_regs()));
	profile_tick(CPU_PROFILING);

#ifdef CONFIG_HEARTBEAT
	/*                                                         
                                                           */
	/*                                                           */
	if (mach_heartbeat) {
	    static unsigned cnt = 0, period = 0, dist = 0;

	    if (cnt == 0 || cnt == dist)
		mach_heartbeat( 1 );
	    else if (cnt == 7 || cnt == dist+7)
		mach_heartbeat( 0 );

	    if (++cnt > period) {
		cnt = 0;
		/*                                                            
                                                             
                                                   
                 */
		period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
		dist = period / 4;
	    }
	}
#endif /*                  */
	return IRQ_HANDLED;
}
Exemplo n.º 6
0
/*
 * We keep time on PA-RISC Linux by using the Interval Timer which is
 * a pair of registers; one is read-only and one is write-only; both
 * accessed through CR16.  The read-only register is 32 or 64 bits wide,
 * and increments by 1 every CPU clock tick.  The architecture only
 * guarantees us a rate between 0.5 and 2, but all implementations use a
 * rate of 1.  The write-only register is 32-bits wide.  When the lowest
 * 32 bits of the read-only register compare equal to the write-only
 * register, it raises a maskable external interrupt.  Each processor has
 * an Interval Timer of its own and they are not synchronised.  
 *
 * We want to generate an interrupt every 1/HZ seconds.  So we program
 * CR16 to interrupt every @clocktick cycles.  The it_value in cpu_data
 * is programmed with the intended time of the next tick.  We can be
 * held off for an arbitrarily long period of time by interrupts being
 * disabled, so we may miss one or more ticks.
 */
irqreturn_t __irq_entry timer_interrupt(int irq, void *dev_id)
{
	unsigned long now;
	unsigned long next_tick;
	unsigned long ticks_elapsed = 0;
	unsigned int cpu = smp_processor_id();
	struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);

	/* gcc can optimize for "read-only" case with a local clocktick */
	unsigned long cpt = clocktick;

	profile_tick(CPU_PROFILING);

	/* Initialize next_tick to the old expected tick time. */
	next_tick = cpuinfo->it_value;

	/* Calculate how many ticks have elapsed. */
	do {
		++ticks_elapsed;
		next_tick += cpt;
		now = mfctl(16);
	} while (next_tick - now > cpt);

	/* Store (in CR16 cycles) up to when we are accounting right now. */
	cpuinfo->it_value = next_tick;

	/* Go do system house keeping. */
	if (cpu == 0)
		xtime_update(ticks_elapsed);

	update_process_times(user_mode(get_irq_regs()));

	/* Skip clockticks on purpose if we know we would miss those.
	 * The new CR16 must be "later" than current CR16 otherwise
	 * itimer would not fire until CR16 wrapped - e.g 4 seconds
	 * later on a 1Ghz processor. We'll account for the missed
	 * ticks on the next timer interrupt.
	 * We want IT to fire modulo clocktick even if we miss/skip some.
	 * But those interrupts don't in fact get delivered that regularly.
	 *
	 * "next_tick - now" will always give the difference regardless
	 * if one or the other wrapped. If "now" is "bigger" we'll end up
	 * with a very large unsigned number.
	 */
	while (next_tick - mfctl(16) > cpt)
		next_tick += cpt;

	/* Program the IT when to deliver the next interrupt.
	 * Only bottom 32-bits of next_tick are writable in CR16!
	 * Timer interrupt will be delivered at least a few hundred cycles
	 * after the IT fires, so if we are too close (<= 500 cycles) to the
	 * next cycle, simply skip it.
	 */
	if (next_tick - mfctl(16) <= 500)
		next_tick += cpt;
	mtctl(next_tick, 16);

	return IRQ_HANDLED;
}
Exemplo n.º 7
0
Arquivo: time.c Projeto: anewkirk/AJK
/*
 * Kernel system timer support.
 */
void timer_tick(void)
{
	profile_tick(CPU_PROFILING);
	xtime_update(1);
#ifndef CONFIG_SMP
	update_process_times(user_mode(get_irq_regs()));
#endif
}
Exemplo n.º 8
0
static irqreturn_t
timer_interrupt (int irq, void *dev_id)
{
	unsigned long new_itm;

	if (cpu_is_offline(smp_processor_id())) {
		return IRQ_HANDLED;
	}

	platform_timer_interrupt(irq, dev_id);

	new_itm = local_cpu_data->itm_next;

	if (!time_after(ia64_get_itc(), new_itm))
		printk(KERN_ERR "Oops: timer tick before it's due (itc=%lx,itm=%lx)\n",
		       ia64_get_itc(), new_itm);

	profile_tick(CPU_PROFILING);

	while (1) {
		update_process_times(user_mode(get_irq_regs()));

		new_itm += local_cpu_data->itm_delta;

		if (smp_processor_id() == time_keeper_id)
			xtime_update(1);

		local_cpu_data->itm_next = new_itm;

		if (time_after(new_itm, ia64_get_itc()))
			break;

		/*
		 * Allow IPIs to interrupt the timer loop.
		 */
		local_irq_enable();
		local_irq_disable();
	}

	do {
		/*
		 * If we're too close to the next clock tick for
		 * comfort, we increase the safety margin by
		 * intentionally dropping the next tick(s).  We do NOT
		 * update itm.next because that would force us to call
		 * xtime_update() which in turn would let our clock run
		 * too fast (with the potentially devastating effect
		 * of losing monotony of time).
		 */
		while (!time_after(new_itm, ia64_get_itc() + local_cpu_data->itm_delta/2))
			new_itm += local_cpu_data->itm_delta;
		ia64_set_itm(new_itm);
		/* double check, in case we got hit by a (slow) PMI: */
	} while (time_after_eq(ia64_get_itc(), new_itm));
	return IRQ_HANDLED;
}
Exemplo n.º 9
0
void advance_ticks(int ticks, int frac, int repeat) {
	int i;
	if (test_params.nohz) {
		for (i = 0; i < repeat; i++) {
			simtsc_frac += (ticks * test_params.clock_freq << FRAC_BITS) / (HZ * frac);
			simtsc += simtsc_frac >> FRAC_BITS;
			simtsc_frac -= simtsc_frac >> FRAC_BITS << FRAC_BITS;
			xtime_update(ticks);
		}
	} else {
		for (i = 0; i < repeat * ticks / frac; i++) {
Exemplo n.º 10
0
/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "xtime_update()" routine every clocktick
 */
irqreturn_t arch_timer_interrupt(int irq, void *dummy)
{

	if (current->pid)
		profile_tick(CPU_PROFILING);

	xtime_update(1);

	update_process_times(user_mode(get_irq_regs()));

	return(IRQ_HANDLED);
}
Exemplo n.º 11
0
irqreturn_t timer_interrupt(int irq, void *dummy)
{
	xtime_update(1);

#ifdef CONFIG_IPIPE
	update_root_process_times(get_irq_regs());
#else
	update_process_times(user_mode(get_irq_regs()));
#endif
	profile_tick(CPU_PROFILING);

	return IRQ_HANDLED;
}
Exemplo n.º 12
0
/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "xtime_update()" routine every clocktick
 */
irqreturn_t timer_interrupt(int irq, void *dummy)
{
	/* Clear the interrupt condition */
	outw(0, timer_membase + ALTERA_TIMER_STATUS_REG);
	nios2_timer_count += NIOS2_TIMER_PERIOD;

	profile_tick(CPU_PROFILING);

	xtime_update(1);

	update_process_times(user_mode(get_irq_regs()));

	return IRQ_HANDLED;
}
Exemplo n.º 13
0
static irqreturn_t timer_interrupt(int dummy, void *dev_id)
{
#ifndef CONFIG_SMP
	profile_tick(CPU_PROFILING);
#endif

	clear_clock_irq();

	xtime_update(1);

#ifndef CONFIG_SMP
	update_process_times(user_mode(get_irq_regs()));
#endif
	return IRQ_HANDLED;
}
Exemplo n.º 14
0
static irqreturn_t sun3_int5(int irq, void *dev_id)
{
#ifdef CONFIG_SUN3
	intersil_clear();
#endif
        *sun3_intreg |=  (1 << irq);
#ifdef CONFIG_SUN3
	intersil_clear();
#endif
	xtime_update(1);
	update_process_times(user_mode(get_irq_regs()));
        if (!(kstat_cpu(0).irqs[irq] % 20))
                sun3_leds(led_pattern[(kstat_cpu(0).irqs[irq] % 160) / 20]);
	return IRQ_HANDLED;
}
Exemplo n.º 15
0
/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "xtime_update()" routine every clocktick
 */
static irqreturn_t timer_interrupt(int irq, void *dummy)
{
	profile_tick(CPU_PROFILING);

	xtime_update(1);

#ifdef CONFIG_HEARTBEAT
	static unsigned short n;
	n++;
	__set_LEDS(n);
#endif /* CONFIG_HEARTBEAT */

	update_process_times(user_mode(get_irq_regs()));

	return IRQ_HANDLED;
}
Exemplo n.º 16
0
static irqreturn_t sun3_int5(int irq, void *dev_id)
{
	unsigned int cnt;

#ifdef CONFIG_SUN3
	intersil_clear();
#endif
#ifdef CONFIG_SUN3
	intersil_clear();
#endif
	xtime_update(1);
	update_process_times(user_mode(get_irq_regs()));
	cnt = kstat_irqs_cpu(irq, 0);
	if (!(cnt % 20))
		sun3_leds(led_pattern[cnt % 160 / 20]);
	return IRQ_HANDLED;
}
Exemplo n.º 17
0
/*
 * timer_tick()
 *	Kernel system timer support. Needs to keep up the real-time clock,
 * 	as well as call the "do_timer()" routine every clocktick.
 */
static irqreturn_t timer_tick(int irq, void *dummy)
{
	int ticks;

	BUG_ON(!irqs_disabled());
	ticks = timer_reset(timervector, frequency);

	xtime_update(ticks);

	update_process_times(user_mode(get_irq_regs()));
	profile_tick(CPU_PROFILING);

#if defined(CONFIG_SMP)
	smp_send_timer_all();
#endif
	return(IRQ_HANDLED);
}
Exemplo n.º 18
0
/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "xtime_update()" routine every clocktick
 */
static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
#ifndef CONFIG_SMP
	profile_tick(CPU_PROFILING);
#endif
	xtime_update(1);

#ifndef CONFIG_SMP
	update_process_times(user_mode(get_irq_regs()));
#endif
	/* As we return to user mode fire off the other CPU schedulers..
	   this is basically because we don't yet share IRQ's around.
	   This message is rigged to be safe on the 386 - basically it's
	   a hack, so don't look closely for now.. */

#ifdef CONFIG_SMP
	smp_local_timer_interrupt();
	smp_send_timer();
#endif

	return IRQ_HANDLED;
}
Exemplo n.º 19
0
static irqreturn_t sun3_int5(int irq, void *dev_id)
{
	unsigned long flags;
	unsigned int cnt;

	local_irq_save(flags);
#ifdef CONFIG_SUN3
	intersil_clear();
#endif
	sun3_disable_irq(5);
	sun3_enable_irq(5);
#ifdef CONFIG_SUN3
	intersil_clear();
#endif
	xtime_update(1);
	update_process_times(user_mode(get_irq_regs()));
	cnt = kstat_irqs_cpu(irq, 0);
	if (!(cnt % 20))
		sun3_leds(led_pattern[cnt % 160 / 20]);
	local_irq_restore(flags);
	return IRQ_HANDLED;
}
Exemplo n.º 20
0
static unsigned long
consider_steal_time(unsigned long new_itm)
{
	unsigned long stolen, blocked;
	unsigned long delta_itm = 0, stolentick = 0;
	int cpu = smp_processor_id();
	struct vcpu_runstate_info runstate;
	struct task_struct *p = current;

	get_runstate_snapshot(&runstate);

	/*
	 * Check for vcpu migration effect
	 * In this case, itc value is reversed.
	 * This causes huge stolen value.
	 * This function just checks and reject this effect.
	 */
	if (!time_after_eq(runstate.time[RUNSTATE_blocked],
			   per_cpu(xen_blocked_time, cpu)))
		blocked = 0;

	if (!time_after_eq(runstate.time[RUNSTATE_runnable] +
			   runstate.time[RUNSTATE_offline],
			   per_cpu(xen_stolen_time, cpu)))
		stolen = 0;

	if (!time_after(delta_itm + new_itm, ia64_get_itc()))
		stolentick = ia64_get_itc() - new_itm;

	do_div(stolentick, NS_PER_TICK);
	stolentick++;

	do_div(stolen, NS_PER_TICK);

	if (stolen > stolentick)
		stolen = stolentick;

	stolentick -= stolen;
	do_div(blocked, NS_PER_TICK);

	if (blocked > stolentick)
		blocked = stolentick;

	if (stolen > 0 || blocked > 0) {
		account_steal_ticks(stolen);
		account_idle_ticks(blocked);
		run_local_timers();

		rcu_check_callbacks(cpu, user_mode(get_irq_regs()));

		scheduler_tick();
		run_posix_cpu_timers(p);
		delta_itm += local_cpu_data->itm_delta * (stolen + blocked);

		if (cpu == time_keeper_id)
			xtime_update(stolen + blocked);

		local_cpu_data->itm_next = delta_itm + new_itm;

		per_cpu(xen_stolen_time, cpu) += NS_PER_TICK * stolen;
		per_cpu(xen_blocked_time, cpu) += NS_PER_TICK * blocked;
	}
	return delta_itm;
}