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ktime.h revision 1.11 
      1 /*	$NetBSD: ktime.h,v 1.11 2021/12/19 01:15:35 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 
     87 static inline struct timeval
     88 ktime_to_timeval(ktime_t kt)
     89 {
     90 	return ns_to_timeval(ktime_to_ns(kt));
     91 }
     92 
     93 static inline ktime_t
     94 timespec_to_ktime(struct timespec ts)
     95 {
     96 	/* XXX Silently truncate?  */
     97 	return ns_to_ktime(1000000000*(int64_t)ts.tv_sec + ts.tv_nsec);
     98 }
     99 
    100 static inline ktime_t
    101 ktime_get(void)
    102 {
    103 	struct timespec ts;
    104 
    105 	nanouptime(&ts);
    106 
    107 	return timespec_to_ktime(ts);
    108 }
    109 
    110 static inline ktime_t
    111 ktime_get_real(void)
    112 {
    113 	struct timespec ts;
    114 
    115 	nanotime(&ts);
    116 
    117 	return timespec_to_ktime(ts);
    118 }
    119 
    120 static inline uint64_t
    121 ktime_get_raw_ns(void)
    122 {
    123 
    124 	/* XXX */
    125 	return ktime_to_ns(ktime_get());
    126 }
    127 
    128 static inline ktime_t
    129 ktime_get_monotonic_offset(void)
    130 {
    131 	struct timespec ts;
    132 
    133 	getnanoboottime(&ts);
    134 
    135 	return timespec_to_ktime(ts);
    136 }
    137 
    138 static inline ktime_t
    139 ktime_mono_to_real(ktime_t kt)
    140 {
    141 	struct timespec ts = ktime_to_timespec(kt);
    142 	struct timespec bts;
    143 
    144 	getnanoboottime(&bts);
    145 	timespecadd(&ts, &bts, &ts);
    146 
    147 	return timespec_to_ktime(ts);
    148 }
    149 
    150 static inline int64_t
    151 ktime_us_delta(ktime_t a, ktime_t b)
    152 {
    153 	return ktime_to_us(ktime_sub(a, b));
    154 }
    155 
    156 static inline bool
    157 time_in_range(unsigned long x, unsigned long a, unsigned long b)
    158 {
    159 	return ((a <= x) && (x <= b));
    160 }
    161 
    162 static inline bool
    163 ktime_after(ktime_t a, ktime_t b)
    164 {
    165 	return ktime_to_ns(a) > ktime_to_ns(b);
    166 }
    167 
    168 #endif  /* _LINUX_KTIME_H_ */
    169