示例#1
0
/*
 * Test harness for verifying ACPI timer behaviour.
 * Boot with debug.acpi.timer_test set to invoke this.
 */
static void
acpi_timer_boot_test(void)
{
    uint32_t u1, u2, u3;

    u1 = acpi_timer_read();
    u2 = acpi_timer_read();
    u3 = acpi_timer_read();

    device_printf(acpi_timer_dev, "timer test in progress, reboot to quit.\n");
    for (;;) {
	/*
	 * The failure case is where u3 > u1, but u2 does not fall between
	 * the two, ie. it contains garbage.
	 */
	if (u3 > u1) {
	    if (u2 < u1 || u2 > u3)
		device_printf(acpi_timer_dev,
			      "timer is not monotonic: 0x%08x,0x%08x,0x%08x\n",
			      u1, u2, u3);
	}
	u1 = u2;
	u2 = u3;
	u3 = acpi_timer_read();
    }
}
示例#2
0
static void
acpi_timer_suspend_handler(struct timecounter *newtc)
{
	struct timecounter *tc;

	/* Deregister existing resume event handler. */
	if (acpi_timer_eh != NULL) {
		EVENTHANDLER_DEREGISTER(power_resume, acpi_timer_eh);
		acpi_timer_eh = NULL;
	}

	if ((timecounter->tc_flags & TC_FLAGS_SUSPEND_SAFE) != 0) {
		/*
		 * If we are using a suspend safe timecounter, don't
		 * save/restore it across suspend/resume.
		 */
		return;
	}

	KASSERT(newtc == &acpi_timer_timecounter,
	    ("acpi_timer_suspend_handler: wrong timecounter"));

	tc = timecounter;
	if (tc != newtc) {
		if (bootverbose)
			device_printf(acpi_timer_dev,
			    "switching timecounter, %s -> %s\n",
			    tc->tc_name, newtc->tc_name);
		(void)acpi_timer_read();
		(void)acpi_timer_read();
		timecounter = newtc;
		acpi_timer_eh = EVENTHANDLER_REGISTER(power_resume,
		    acpi_timer_resume_handler, tc, EVENTHANDLER_PRI_LAST);
	}
}
static int
acpi_timer_test()
{
    uint32_t	last, this;
    int		min, max, n, delta;
    register_t	s;

    min = 10000000;
    max = 0;

    /* Test the timer with interrupts disabled to get accurate results. */
    s = intr_disable();
    last = acpi_timer_read();
    for (n = 0; n < N; n++) {
	this = acpi_timer_read();
	delta = acpi_TimerDelta(this, last);
	if (delta > max)
	    max = delta;
	else if (delta < min)
	    min = delta;
	last = this;
    }
    intr_restore(s);

    if (max - min > 2)
	n = 0;
    else if (min < 0 || max == 0)
	n = 0;
    else
	n = 1;
    if (bootverbose)
	printf(" %d/%d", n, max-min);

    return (n);
}
示例#4
0
static int
acpi_timer_test(void)
{
    uint32_t	last, this;
    int		min, max, n, delta;
    register_t	s;

    min = 10000000;
    max = 0;

    /* Test the timer with interrupts disabled to get accurate results. */
#if defined(__i386__)
    s = read_eflags();
#elif defined(__x86_64__)
    s = read_rflags();
#else
#error "no read_eflags"
#endif
    cpu_disable_intr();
    last = acpi_timer_read();
    for (n = 0; n < 2000; n++) {
	this = acpi_timer_read();
	delta = acpi_TimerDelta(this, last);
	if (delta > max)
	    max = delta;
	else if (delta < min)
	    min = delta;
	last = this;
    }
#if defined(__i386__)
    write_eflags(s);
#elif defined(__x86_64__)
    write_rflags(s);
#else
#error "no read_eflags"
#endif

    if (max - min > 2)
	n = 0;
    else if (min < 0 || max == 0)
	n = 0;
    else
	n = 1;
    if (bootverbose) {
	kprintf("ACPI timer looks %s min = %d, max = %d, width = %d\n",
		n ? "GOOD" : "BAD ",
		min, max, max - min);
    }

    return (n);
}
示例#5
0
/*
 * Fetch current time value from hardware that may not correctly
 * latch the counter.  We need to read until we have three monotonic
 * samples and then use the middle one, otherwise we are not protected
 * against the fact that the bits can be wrong in two directions.  If
 * we only cared about monosity, two reads would be enough.
 */
static u_int
acpi_timer_get_timecount_safe(struct timecounter *tc)
{
    u_int u1, u2, u3;

    u2 = acpi_timer_read();
    u3 = acpi_timer_read();
    do {
	u1 = u2;
	u2 = u3;
	u3 = acpi_timer_read();
    } while (u1 > u2 || u2 > u3);

    return (u2);
}
示例#6
0
static int
acpi_timer_test()
{
    uint32_t last, this;
    int delta, max, max2, min, n;
    register_t s;

    min = INT32_MAX;
    max = max2 = 0;

    /* Test the timer with interrupts disabled to get accurate results. */
    s = intr_disable();
    last = acpi_timer_read();
    for (n = 0; n < N; n++) {
	this = acpi_timer_read();
	delta = acpi_TimerDelta(this, last);
	if (delta > max) {
	    max2 = max;
	    max = delta;
	} else if (delta > max2)
	    max2 = delta;
	if (delta < min)
	    min = delta;
	last = this;
    }
    intr_restore(s);

    delta = max2 - min;
    if ((max - min > 8 || delta > 3) && vm_guest == VM_GUEST_NO)
	n = 0;
    else if (min < 0 || max == 0 || max2 == 0)
	n = 0;
    else
	n = 1;
    if (bootverbose)
	printf(" %d/%d", n, delta);

    return (n);
}
示例#7
0
/*
 * Fetch current time value from reliable hardware.
 *
 * The cputimer interface requires a 32 bit return value.  If the ACPI timer
 * is only 24 bits then we have to keep track of the upper 8 bits on our
 * own.
 *
 * XXX we could probably get away with using a per-cpu field for this and
 * just use interrupt disablement instead of clock_lock.
 */
static sysclock_t
acpi_timer_get_timecount24(void)
{
    sysclock_t counter;

    clock_lock();
    counter = acpi_timer_read();
    if (counter < acpi_last_counter)
	acpi_cputimer.base += 0x01000000;
    acpi_last_counter = counter;
    counter += acpi_cputimer.base;
    clock_unlock();
    return (counter);
}
示例#8
0
/*
 * Fetch current time value from hardware that may not correctly
 * latch the counter.  We need to read until we have three monotonic
 * samples and then use the middle one, otherwise we are not protected
 * against the fact that the bits can be wrong in two directions.  If
 * we only cared about monosity, two reads would be enough.
 */
static sysclock_t
acpi_timer_get_timecount_safe(void)
{
    u_int u1, u2, u3;

    if (acpi_counter_mask != 0xffffffff)
	clock_lock();

    u2 = acpi_timer_read();
    u3 = acpi_timer_read();
    do {
	u1 = u2;
	u2 = u3;
	u3 = acpi_timer_read();
    } while (u1 > u2 || u2 > u3);

    if (acpi_counter_mask != 0xffffffff) {
	if (u2 < acpi_last_counter)
	    acpi_cputimer.base += 0x01000000;
	acpi_last_counter = u2;
	clock_unlock();
    }
    return (u2 + acpi_cputimer.base);
}
示例#9
0
static sysclock_t
acpi_timer_get_timecount(void)
{
    return (acpi_timer_read() + acpi_cputimer.base);
}
示例#10
0
/*
 * Fetch current time value from reliable hardware.
 */
static u_int
acpi_timer_get_timecount(struct timecounter *tc)
{
    return (acpi_timer_read());
}