xref: /netbsd/sys/external/bsd/drm2/include/linux/jiffies.h (revision 83b51cad)

/*	$NetBSD: jiffies.h,v 1.14 2022/03/18 23:32:49 riastradh Exp $	*/

/*-
 * Copyright (c) 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Taylor R. Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _LINUX_JIFFIES_H_
#define _LINUX_JIFFIES_H_

#include <sys/param.h>
#include <sys/kernel.h>

#include <asm/param.h>		/* HZ */

#include <linux/math64.h>

#define	jiffies		getticks()
#define	jiffies_64	getticks() /* XXX */

/* XXX Er, what?  */
#define	MAX_JIFFY_OFFSET	((INT_MAX >> 1) - 1)

static inline uint64_t
get_jiffies_64(void)
{

	return (uint64_t)(unsigned)getticks();
}

static inline uint64_t
nsecs_to_jiffies64(uint64_t nsec)
{

	/* XXX Arbitrary cutoff, should review the arithmetic.  */
	if (((1000000000 % hz) == 0) || (nsec >= 20000000000ul))
		return (nsec/1000000000)*hz;
	else
		return (nsec*hz)/1000000000;
}

static inline uint32_t
nsecs_to_jiffies(uint64_t nsec)
{

	/* XXX Not sure what else to do but truncate...  */
	return (uint32_t)nsecs_to_jiffies64(nsec);
}

static inline unsigned int
msecs_to_jiffies(unsigned int msec)
{
	return mstohz(msec);
}

static inline unsigned int
jiffies_to_msecs(unsigned int j)
{
	return hztoms(j);
}

static inline unsigned int
usecs_to_jiffies(unsigned int usec)
{
	const struct timeval tv = {
		.tv_sec = usec / 1000000,
		.tv_usec = usec % 1000000,
	};

	return tvtohz(&tv);
}

static inline unsigned int
jiffies_to_usecs(unsigned int j)
{

	/* XXX Do better arithmetic.  */
	return (unsigned int)((unsigned long)j*1000000/hz);
}

static inline unsigned int
timespec_to_jiffies(const struct timespec *ts)
{
	return tstohz(ts);
}

/* XXX long is the wrong type here times...  */

#define	__linux_time_compare(A, OP, B)	(((long)(A) - (long)(B)) OP 0)

static inline bool
time_after(unsigned long a, unsigned long b)
{
	return __linux_time_compare(a, >, b);
}

static inline bool
time_after_eq(unsigned long a, unsigned long b)
{
	return __linux_time_compare(a, >=, b);
}

static inline bool
time_before(unsigned long a, unsigned long b)
{
	return __linux_time_compare(a, <, b);
}

static inline bool
time_before_eq(unsigned long a, unsigned long b)
{
	return __linux_time_compare(a, <=, b);
}

#endif  /* _LINUX_JIFFIES_H_ */