C++ (Cpp) get_cpu_var_ptr Examples

Example #1

File: arch_clock.c Project: kl07/minix-course

void cycles_accounting_init(void)
{
	read_tsc_64(get_cpu_var_ptr(cpu, tsc_ctr_switch));

	make_zero64(get_cpu_var(cpu, cpu_last_tsc));
	make_zero64(get_cpu_var(cpu, cpu_last_idle));
}

Example #2

File: arch_clock.c Project: CesarBallardini/minix3

PUBLIC short cpu_load(void)
{
	u64_t current_tsc, *current_idle;
	u64_t tsc_delta, idle_delta, busy;
	struct proc *idle;
	short load;
#ifdef CONFIG_SMP
	unsigned cpu = cpuid;
#endif

	u64_t *last_tsc, *last_idle;

	last_tsc = get_cpu_var_ptr(cpu, cpu_last_tsc);
	last_idle = get_cpu_var_ptr(cpu, cpu_last_idle);

	idle = get_cpu_var_ptr(cpu, idle_proc);;
	read_tsc_64(&current_tsc);
	current_idle = &idle->p_cycles; /* ptr to idle proc */

	/* calculate load since last cpu_load invocation */
	if (!is_zero64(*last_tsc)) {
		tsc_delta = sub64(current_tsc, *last_tsc);
		idle_delta = sub64(*current_idle, *last_idle);

		busy = sub64(tsc_delta, idle_delta);
		busy = mul64(busy, make64(100, 0));
		load = ex64lo(div64(busy, tsc_delta));

		if (load > 100)
			load = 100;
	} else
		load = 0;
	
	*last_tsc = current_tsc;
	*last_idle = *current_idle;
	return load;
}

Example #3

File: arch_clock.c Project: CesarBallardini/minix3

PUBLIC int init_local_timer(unsigned freq)
{
#ifdef USE_APIC
	/* if we know the address, lapic is enabled and we should use it */
	if (lapic_addr) {
		unsigned cpu = cpuid;
		tsc_per_ms[cpu] = div64u(cpu_get_freq(cpu), 1000);
		lapic_set_timer_one_shot(1000000/system_hz);
	} else
	{
		BOOT_VERBOSE(printf("Initiating legacy i8253 timer\n"));
#else
	{
#endif
		init_8253A_timer(freq);
		estimate_cpu_freq();
		/* always only 1 cpu in the system */
		tsc_per_ms[0] = div64u(cpu_get_freq(0), 1000);
	}

	return 0;
}

PUBLIC void stop_local_timer(void)
{
#ifdef USE_APIC
	if (lapic_addr) {
		lapic_stop_timer();
		apic_eoi();
	} else
#endif
	{
		stop_8253A_timer();
	}
}

PUBLIC void restart_local_timer(void)
{
#ifdef USE_APIC
	if (lapic_addr) {
		lapic_restart_timer();
	}
#endif
}

PUBLIC int register_local_timer_handler(const irq_handler_t handler)
{
#ifdef USE_APIC
	if (lapic_addr) {
		/* Using APIC, it is configured in apic_idt_init() */
		BOOT_VERBOSE(printf("Using LAPIC timer as tick source\n"));
	} else
#endif
	{
		/* Using PIC, Initialize the CLOCK's interrupt hook. */
		pic_timer_hook.proc_nr_e = NONE;
		pic_timer_hook.irq = CLOCK_IRQ;

		put_irq_handler(&pic_timer_hook, CLOCK_IRQ, handler);
	}

	return 0;
}

PUBLIC void cycles_accounting_init(void)
{
#ifdef CONFIG_SMP
	unsigned cpu = cpuid;
#endif

	read_tsc_64(get_cpu_var_ptr(cpu, tsc_ctr_switch));

	make_zero64(get_cpu_var(cpu, cpu_last_tsc));
	make_zero64(get_cpu_var(cpu, cpu_last_idle));
}