Quelle  dummy_timer.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/drivers/clocksource/dummy_timer.c
 *
 *  Copyright (C) 2013 ARM Ltd.
 *  All Rights Reserved
 */
#include <linux/clockchips.h>
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/cpumask.h>

static DEFINE_PER_CPU(struct clock_event_device, dummy_timer_evt);

static int dummy_timer_starting_cpu(unsigned int cpu)
{
 struct clock_event_device *evt = per_cpu_ptr(&dummy_timer_evt, cpu);

 evt->name = "dummy_timer";
 evt->features = CLOCK_EVT_FEAT_PERIODIC |
     CLOCK_EVT_FEAT_ONESHOT |
     CLOCK_EVT_FEAT_DUMMY;
 evt->rating = 100;
 evt->cpumask = cpumask_of(cpu);

 clockevents_register_device(evt);
 return 0;
}

static int __init dummy_timer_register(void)
{
 return cpuhp_setup_state(CPUHP_AP_DUMMY_TIMER_STARTING,
     "clockevents/dummy_timer:starting",
     dummy_timer_starting_cpu, NULL);
}
early_initcall(dummy_timer_register);