/*	$OpenBSD: ktime.h,v 1.8 2024/03/28 02:36:38 jsg Exp $	*/
/*
 * Copyright (c) 2013, 2014, 2015 Mark Kettenis
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _LINUX_KTIME_H
#define _LINUX_KTIME_H

#include <sys/time.h>
#include <linux/time.h>
#include <linux/jiffies.h>

typedef int64_t ktime_t;
#define KTIME_MAX INT64_MAX

static inline ktime_t
ktime_get(void)
{
	struct timespec ts;
	nanouptime(&ts);
	return TIMESPEC_TO_NSEC(&ts);
}

static inline ktime_t
ktime_get_raw(void)
{
	struct timespec ts;
	nanouptime(&ts);
	return TIMESPEC_TO_NSEC(&ts);
}

static inline int64_t
ktime_to_ms(ktime_t k)
{
	return k / NSEC_PER_MSEC;
}

static inline int64_t
ktime_to_us(ktime_t k)
{
	return k / NSEC_PER_USEC;
}

static inline int64_t
ktime_to_ns(ktime_t k)
{
	return k;
}

static inline int64_t
ktime_get_raw_ns(void)
{
	return ktime_to_ns(ktime_get_raw());
}

static inline int64_t
ktime_get_raw_fast_ns(void)
{
	return ktime_to_ns(ktime_get_raw());
}

static inline struct timespec64
ktime_to_timespec64(ktime_t k)
{
	struct timespec64 ts;
	ts.tv_sec = k / NSEC_PER_SEC;
	ts.tv_nsec = k % NSEC_PER_SEC;
	if (ts.tv_nsec < 0) {
		ts.tv_sec--;
		ts.tv_nsec += NSEC_PER_SEC;
	}
	return ts;
}

static inline ktime_t
ktime_sub(ktime_t a, ktime_t b)
{
	return a - b;
}

static inline ktime_t
ktime_add(ktime_t a, ktime_t b)
{
	return a + b;
}

static inline ktime_t
ktime_add_us(ktime_t k, uint64_t us)
{
	return k + (us * NSEC_PER_USEC);
}

static inline ktime_t
ktime_add_ms(ktime_t k, uint64_t ms)
{
	return k + (ms * NSEC_PER_MSEC);
}

static inline ktime_t
ktime_add_ns(ktime_t k, int64_t ns)
{
	return k + ns;
}

static inline ktime_t
ktime_sub_ns(ktime_t k, int64_t ns)
{
	return k - ns;
}

static inline int64_t
ktime_us_delta(ktime_t a, ktime_t b)
{
	return ktime_to_us(ktime_sub(a, b));
}

static inline int64_t
ktime_ms_delta(ktime_t a, ktime_t b)
{
	return ktime_to_ms(ktime_sub(a, b));
}

static inline bool
ktime_before(ktime_t a, ktime_t b)
{
	return a < b;
}

static inline bool
ktime_after(ktime_t a, ktime_t b)
{
	return a > b;
}

static inline ktime_t
ns_to_ktime(uint64_t ns)
{
	return ns;
}

static inline ktime_t
ms_to_ktime(uint64_t ms)
{
	return ms * NSEC_PER_MSEC;
}

static inline int64_t
ktime_divns(ktime_t a, int64_t ns)
{
	return a / ns;
}

static inline ktime_t
ktime_set(time_t s, long ns)
{
	struct timespec ts;
	ts.tv_sec = s;
	ts.tv_nsec = ns;
	return TIMESPEC_TO_NSEC(&ts);
}

#include <linux/timekeeping.h>

#endif