zircon/kernel/include/platform/timer.h

// Copyright 2016 The Fuchsia Authors
// Copyright (c) 2008 Travis Geiselbrecht
//
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT

#ifndef ZIRCON_KERNEL_INCLUDE_PLATFORM_TIMER_H_
#define ZIRCON_KERNEL_INCLUDE_PLATFORM_TIMER_H_

#include <zircon/compiler.h>
#include <zircon/types.h>

__BEGIN_CDECLS

typedef void (*platform_timer_callback)(zx_time_t now);

// API to set/clear a hardware timer that is responsible for calling timer_tick() when it fires
zx_status_t platform_set_oneshot_timer(zx_time_t deadline);
void platform_stop_timer(void);

// Shutdown the calling CPU's platform timer.
//
// Should be called after |platform_stop_timer|, but before taking the CPU offline.
//
// TODO(maniscalco): Provide a "resume" function so we can suspend/resume.
void platform_shutdown_timer(void);

void timer_tick(zx_time_t now);

__END_CDECLS

#endif  // ZIRCON_KERNEL_INCLUDE_PLATFORM_TIMER_H_