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ktime.h revision 1.12 
      1 /*	$NetBSD: ktime.h,v 1.12 2021/12/19 01:16:28 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_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/jiffies.h>
     41 #include <linux/time.h>
     42 
     43 typedef int64_t	ktime_t;
     44 
     45 static inline int64_t
     46 ktime_to_ns(ktime_t kt)
     47 {
     48 	return kt;
     49 }
     50 
     51 static inline int64_t
     52 ktime_to_us(ktime_t kt)
     53 {
     54 	return ktime_to_ns(kt)/1000;
     55 }
     56 
     57 static inline ktime_t
     58 ns_to_ktime(int64_t nsec)
     59 {
     60 	return nsec;
     61 }
     62 
     63 static inline ktime_t
     64 ktime_add_ns(ktime_t kt, int64_t nsec)
     65 {
     66 	return ns_to_ktime(ktime_to_ns(kt) + nsec);
     67 }
     68 
     69 static inline ktime_t
     70 ktime_sub(ktime_t a, ktime_t b)
     71 {
     72 	return ns_to_ktime(ktime_to_ns(a) - ktime_to_ns(b));
     73 }
     74 
     75 static inline ktime_t
     76 ktime_sub_ns(ktime_t a, int64_t nsec)
     77 {
     78 	return ns_to_ktime(ktime_to_ns(a) - nsec);
     79 }
     80 
     81 static inline struct timespec
     82 ktime_to_timespec(ktime_t kt)
     83 {
     84 	return ns_to_timespec(ktime_to_ns(kt));
     85 }
     86 #define	ktime_to_timespec64	ktime_to_timespec
     87 
     88 static inline struct timeval
     89 ktime_to_timeval(ktime_t kt)
     90 {
     91 	return ns_to_timeval(ktime_to_ns(kt));
     92 }
     93 
     94 static inline ktime_t
     95 timespec_to_ktime(struct timespec ts)
     96 {
     97 	/* XXX Silently truncate?  */
     98 	return ns_to_ktime(1000000000*(int64_t)ts.tv_sec + ts.tv_nsec);
     99 }
    100 #define	timespec64_to_ktime	timespec_to_ktime
    101 
    102 static inline ktime_t
    103 ktime_get(void)
    104 {
    105 	struct timespec ts;
    106 
    107 	nanouptime(&ts);
    108 
    109 	return timespec_to_ktime(ts);
    110 }
    111 
    112 static inline ktime_t
    113 ktime_get_real(void)
    114 {
    115 	struct timespec ts;
    116 
    117 	nanotime(&ts);
    118 
    119 	return timespec_to_ktime(ts);
    120 }
    121 
    122 static inline uint64_t
    123 ktime_get_raw_ns(void)
    124 {
    125 
    126 	/* XXX */
    127 	return ktime_to_ns(ktime_get());
    128 }
    129 
    130 static inline ktime_t
    131 ktime_get_monotonic_offset(void)
    132 {
    133 	struct timespec ts;
    134 
    135 	getnanoboottime(&ts);
    136 
    137 	return timespec_to_ktime(ts);
    138 }
    139 
    140 static inline ktime_t
    141 ktime_mono_to_real(ktime_t kt)
    142 {
    143 	struct timespec ts = ktime_to_timespec(kt);
    144 	struct timespec bts;
    145 
    146 	getnanoboottime(&bts);
    147 	timespecadd(&ts, &bts, &ts);
    148 
    149 	return timespec_to_ktime(ts);
    150 }
    151 
    152 static inline int64_t
    153 ktime_us_delta(ktime_t a, ktime_t b)
    154 {
    155 	return ktime_to_us(ktime_sub(a, b));
    156 }
    157 
    158 static inline bool
    159 time_in_range(unsigned long x, unsigned long a, unsigned long b)
    160 {
    161 	return ((a <= x) && (x <= b));
    162 }
    163 
    164 static inline bool
    165 ktime_after(ktime_t a, ktime_t b)
    166 {
    167 	return ktime_to_ns(a) > ktime_to_ns(b);
    168 }
    169 
    170 #endif  /* _LINUX_KTIME_H_ */
    171