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      1 /*	$NetBSD: jiffies.h,v 1.14 2022/03/18 23:32:49 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_JIFFIES_H_
     33 #define _LINUX_JIFFIES_H_
     34 
     35 #include <sys/param.h>
     36 #include <sys/kernel.h>
     37 
     38 #include <asm/param.h>		/* HZ */
     39 
     40 #include <linux/math64.h>
     41 
     42 #define	jiffies		getticks()
     43 #define	jiffies_64	getticks() /* XXX */
     44 
     45 /* XXX Er, what?  */
     46 #define	MAX_JIFFY_OFFSET	((INT_MAX >> 1) - 1)
     47 
     48 static inline uint64_t
     49 get_jiffies_64(void)
     50 {
     51 
     52 	return (uint64_t)(unsigned)getticks();
     53 }
     54 
     55 static inline uint64_t
     56 nsecs_to_jiffies64(uint64_t nsec)
     57 {
     58 
     59 	/* XXX Arbitrary cutoff, should review the arithmetic.  */
     60 	if (((1000000000 % hz) == 0) || (nsec >= 20000000000ul))
     61 		return (nsec/1000000000)*hz;
     62 	else
     63 		return (nsec*hz)/1000000000;
     64 }
     65 
     66 static inline uint32_t
     67 nsecs_to_jiffies(uint64_t nsec)
     68 {
     69 
     70 	/* XXX Not sure what else to do but truncate...  */
     71 	return (uint32_t)nsecs_to_jiffies64(nsec);
     72 }
     73 
     74 static inline unsigned int
     75 msecs_to_jiffies(unsigned int msec)
     76 {
     77 	return mstohz(msec);
     78 }
     79 
     80 static inline unsigned int
     81 jiffies_to_msecs(unsigned int j)
     82 {
     83 	return hztoms(j);
     84 }
     85 
     86 static inline unsigned int
     87 usecs_to_jiffies(unsigned int usec)
     88 {
     89 	const struct timeval tv = {
     90 		.tv_sec = usec / 1000000,
     91 		.tv_usec = usec % 1000000,
     92 	};
     93 
     94 	return tvtohz(&tv);
     95 }
     96 
     97 static inline unsigned int
     98 jiffies_to_usecs(unsigned int j)
     99 {
    100 
    101 	/* XXX Do better arithmetic.  */
    102 	return (unsigned int)((unsigned long)j*1000000/hz);
    103 }
    104 
    105 static inline unsigned int
    106 timespec_to_jiffies(const struct timespec *ts)
    107 {
    108 	return tstohz(ts);
    109 }
    110 
    111 /* XXX long is the wrong type here times...  */
    112 
    113 #define	__linux_time_compare(A, OP, B)	(((long)(A) - (long)(B)) OP 0)
    114 
    115 static inline bool
    116 time_after(unsigned long a, unsigned long b)
    117 {
    118 	return __linux_time_compare(a, >, b);
    119 }
    120 
    121 static inline bool
    122 time_after_eq(unsigned long a, unsigned long b)
    123 {
    124 	return __linux_time_compare(a, >=, b);
    125 }
    126 
    127 static inline bool
    128 time_before(unsigned long a, unsigned long b)
    129 {
    130 	return __linux_time_compare(a, <, b);
    131 }
    132 
    133 static inline bool
    134 time_before_eq(unsigned long a, unsigned long b)
    135 {
    136 	return __linux_time_compare(a, <=, b);
    137 }
    138 
    139 #endif  /* _LINUX_JIFFIES_H_ */
    140