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ktime.h revision 1.8 
      1 /*	$NetBSD: ktime.h,v 1.8 2020/01/02 15:42:26 thorpej 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_KTIME_H_
     33 #define _LINUX_KTIME_H_
     34 
     35 #include <sys/types.h>
     36 #include <sys/endian.h>
     37 #include <sys/kernel.h>
     38 #include <sys/time.h>
     39 
     40 #include <linux/time.h>
     41 
     42 union ktime {
     43 	int64_t kt_nsec;
     44 };
     45 
     46 typedef union ktime ktime_t;
     47 
     48 static inline int64_t
     49 ktime_to_ns(ktime_t kt)
     50 {
     51 	return kt.kt_nsec;
     52 }
     53 
     54 static inline int64_t
     55 ktime_to_us(ktime_t kt)
     56 {
     57 	return ktime_to_ns(kt)/1000;
     58 }
     59 
     60 static inline ktime_t
     61 ns_to_ktime(int64_t nsec)
     62 {
     63 	return (ktime_t) { .kt_nsec = nsec };
     64 }
     65 
     66 static inline ktime_t
     67 ktime_add_ns(ktime_t kt, int64_t nsec)
     68 {
     69 	return ns_to_ktime(ktime_to_ns(kt) + nsec);
     70 }
     71 
     72 static inline ktime_t
     73 ktime_sub(ktime_t a, ktime_t b)
     74 {
     75 	return ns_to_ktime(ktime_to_ns(a) - ktime_to_ns(b));
     76 }
     77 
     78 static inline ktime_t
     79 ktime_sub_ns(ktime_t a, int64_t nsec)
     80 {
     81 	return ns_to_ktime(ktime_to_ns(a) - nsec);
     82 }
     83 
     84 static inline struct timespec
     85 ktime_to_timespec(ktime_t kt)
     86 {
     87 	return ns_to_timespec(ktime_to_ns(kt));
     88 }
     89 
     90 static inline struct timeval
     91 ktime_to_timeval(ktime_t kt)
     92 {
     93 	return ns_to_timeval(ktime_to_ns(kt));
     94 }
     95 
     96 static inline ktime_t
     97 timespec_to_ktime(struct timespec ts)
     98 {
     99 	/* XXX Silently truncate?  */
    100 	return ns_to_ktime(1000000000*(int64_t)ts.tv_sec + ts.tv_nsec);
    101 }
    102 
    103 static inline ktime_t
    104 ktime_get(void)
    105 {
    106 	struct timespec ts;
    107 
    108 	nanouptime(&ts);
    109 
    110 	return timespec_to_ktime(ts);
    111 }
    112 
    113 static inline ktime_t
    114 ktime_get_real(void)
    115 {
    116 	struct timespec ts;
    117 
    118 	nanotime(&ts);
    119 
    120 	return timespec_to_ktime(ts);
    121 }
    122 
    123 static inline uint64_t
    124 ktime_get_raw_ns(void)
    125 {
    126 
    127 	/* XXX */
    128 	return ktime_to_ns(ktime_get());
    129 }
    130 
    131 static inline ktime_t
    132 ktime_get_monotonic_offset(void)
    133 {
    134 	struct timespec ts;
    135 
    136 	getnanoboottime(&ts);
    137 
    138 	return timespec_to_ktime(ts);
    139 }
    140 
    141 static inline ktime_t
    142 ktime_mono_to_real(ktime_t kt)
    143 {
    144 	struct timespec ts = ktime_to_timespec(kt);
    145 	struct timespec bts;
    146 
    147 	getnanoboottime(&bts);
    148 	timespecadd(&ts, &bts, &ts);
    149 
    150 	return timespec_to_ktime(ts);
    151 }
    152 
    153 static inline int64_t
    154 ktime_us_delta(ktime_t a, ktime_t b)
    155 {
    156 	return ktime_to_us(ktime_sub(a, b));
    157 }
    158 
    159 static inline bool
    160 time_in_range(unsigned long x, unsigned long a, unsigned long b)
    161 {
    162 	return ((a <= x) && (x <= b));
    163 }
    164 
    165 #endif  /* _LINUX_KTIME_H_ */
    166