clocksource.hpp

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// SPDX-License-Identifier: GPL-3.0-or-later
 
#pragma once
 
#include <mos/lib/structures/list.hpp>
#include <mos/types.hpp>
 
typedef struct clocksource
{
    as_linked_list;
    const char *const name;
    u64 ticks;     // number of ticks since boot
    u64 frequency; // ticks per second
} clocksource_t;
 
extern list_head clocksources;
extern clocksource_t *active_clocksource;
#define active_clocksource_ticks() READ_ONCE(active_clocksource->ticks)
 
void clocksource_register(clocksource_t *clocksource);
 
void clocksource_tick(clocksource_t *clocksource); // called by the timer interrupt handler