C++ (Cpp) gic_read_count Examples

Example #1

File: mips-gic-timer.c Project: hackbras/linux

static int gic_next_event(unsigned long delta, struct clock_event_device *evt)
{
	u64 cnt;
	int res;

	cnt = gic_read_count();
	cnt += (u64)delta;
	gic_write_cpu_compare(cnt, cpumask_first(evt->cpumask));
	res = ((int)(gic_read_count() - cnt) >= 0) ? -ETIME : 0;
	return res;
}

Example #2

File: mips-gic-timer.c Project: RafaelFazzolino/linux

static int gic_next_event(unsigned long delta, struct clock_event_device *evt)
{
	int cpu = cpumask_first(evt->cpumask);
	u64 cnt;
	int res;

	cnt = gic_read_count();
	cnt += (u64)delta;
	if (cpu == raw_smp_processor_id()) {
		write_gic_vl_compare(cnt);
	} else {
		write_gic_vl_other(mips_cm_vp_id(cpu));
		write_gic_vo_compare(cnt);
	}
	res = ((int)(gic_read_count() - cnt) >= 0) ? -ETIME : 0;
	return res;
}

Example #3

File: malta-time.c Project: Claude1986/Atheros-CSI-Tool

/*
 * Estimate CPU and GIC frequencies.
 */
static void __init estimate_frequencies(void)
{
	unsigned long flags;
	unsigned int count, start;
	cycle_t giccount = 0, gicstart = 0;

#if defined(CONFIG_KVM_GUEST) && CONFIG_KVM_GUEST_TIMER_FREQ
	mips_hpt_frequency = CONFIG_KVM_GUEST_TIMER_FREQ * 1000000;
	return;
#endif

	local_irq_save(flags);

	/* Start counter exactly on falling edge of update flag. */
	while (CMOS_READ(RTC_REG_A) & RTC_UIP);
	while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));

	/* Initialize counters. */
	start = read_c0_count();
	if (gic_present) {
		gic_start_count();
		gicstart = gic_read_count();
	}

	/* Read counter exactly on falling edge of update flag. */
	while (CMOS_READ(RTC_REG_A) & RTC_UIP);
	while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));

	count = read_c0_count();
	if (gic_present)
		giccount = gic_read_count();

	local_irq_restore(flags);

	count -= start;
	mips_hpt_frequency = count;

	if (gic_present) {
		giccount -= gicstart;
		gic_frequency = giccount;
	}
}

Example #4

File: mips-gic-timer.c Project: hackbras/linux

static cycle_t gic_hpt_read(struct clocksource *cs)
{
	return gic_read_count();
}

Example #5

File: malta-time.c Project: Endika/linux

/*
 * Estimate CPU and GIC frequencies.
 */
static void __init estimate_frequencies(void)
{
	unsigned long flags;
	unsigned int count, start;
	unsigned char secs1, secs2, ctrl;
	int secs;
	u64 giccount = 0, gicstart = 0;

#if defined(CONFIG_KVM_GUEST) && CONFIG_KVM_GUEST_TIMER_FREQ
	mips_hpt_frequency = CONFIG_KVM_GUEST_TIMER_FREQ * 1000000;
	return;
#endif

	local_irq_save(flags);

	if (gic_present)
		gic_start_count();

	/*
	 * Read counters exactly on rising edge of update flag.
	 * This helps get an accurate reading under virtualisation.
	 */
	while (CMOS_READ(RTC_REG_A) & RTC_UIP);
	while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));
	start = read_c0_count();
	if (gic_present)
		gicstart = gic_read_count();

	/* Wait for falling edge before reading RTC. */
	while (CMOS_READ(RTC_REG_A) & RTC_UIP);
	secs1 = CMOS_READ(RTC_SECONDS);

	/* Read counters again exactly on rising edge of update flag. */
	while (!(CMOS_READ(RTC_REG_A) & RTC_UIP));
	count = read_c0_count();
	if (gic_present)
		giccount = gic_read_count();

	/* Wait for falling edge before reading RTC again. */
	while (CMOS_READ(RTC_REG_A) & RTC_UIP);
	secs2 = CMOS_READ(RTC_SECONDS);

	ctrl = CMOS_READ(RTC_CONTROL);

	local_irq_restore(flags);

	if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
		secs1 = bcd2bin(secs1);
		secs2 = bcd2bin(secs2);
	}
	secs = secs2 - secs1;
	if (secs < 1)
		secs += 60;

	count -= start;
	count /= secs;
	mips_hpt_frequency = count;

	if (gic_present) {
		giccount = div_u64(giccount - gicstart, secs);
		gic_frequency = giccount;
	}
}