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ktime.h revision 1.4 
      1 /*	$NetBSD: ktime.h,v 1.4 2018/08/27 07:03:11 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/time.h>
     38 
     39 #include <linux/time.h>
     40 
     41 union ktime {
     42 	int64_t kt_nsec;
     43 	struct {
     44 #if _BYTE_ORDER == _BIG_ENDIAN
     45 		int32_t ktsn_sec;
     46 		int32_t ktsn_nsec;
     47 #else
     48 		int32_t ktsn_nsec;
     49 		int32_t ktsn_sec;
     50 #endif
     51 	} kt_sec_nsec;
     52 };
     53 
     54 typedef union ktime ktime_t;
     55 
     56 static inline ktime_t
     57 ktime_add_ns(ktime_t kt, int64_t nsec)
     58 {
     59 	return (ktime_t) { .kt_nsec = (kt.kt_nsec + nsec) };
     60 }
     61 
     62 static inline int64_t
     63 ktime_to_ns(ktime_t kt)
     64 {
     65 	return kt.kt_nsec;
     66 }
     67 
     68 static inline ktime_t
     69 ns_to_ktime(int64_t nsec)
     70 {
     71 	ktime_t kt;
     72 
     73 	kt.kt_nsec = nsec;
     74 
     75 	return kt;
     76 }
     77 
     78 static inline ktime_t
     79 ktime_sub(ktime_t a, ktime_t b)
     80 {
     81 	return ns_to_ktime(ktime_to_ns(a) - ktime_to_ns(b));
     82 }
     83 
     84 static inline ktime_t
     85 ktime_sub_ns(ktime_t a, int64_t nsec)
     86 {
     87 	return ns_to_ktime(ktime_to_ns(a) - nsec);
     88 }
     89 
     90 static inline struct timespec
     91 ktime_to_timespec(ktime_t kt)
     92 {
     93 	return ns_to_timespec(ktime_to_ns(kt));
     94 }
     95 
     96 static inline struct timeval
     97 ktime_to_timeval(ktime_t kt)
     98 {
     99 	return ns_to_timeval(ktime_to_ns(kt));
    100 }
    101 
    102 static inline ktime_t
    103 timespec_to_ktime(struct timespec ts)
    104 {
    105 	return ns_to_ktime(1000000000*ts.tv_sec + ts.tv_nsec);
    106 }
    107 
    108 static inline ktime_t
    109 ktime_get(void)
    110 {
    111 	struct timespec ts;
    112 	ktime_t kt;
    113 
    114 	nanouptime(&ts);
    115 
    116 	/* XXX Silently truncate?  */
    117 	kt.kt_sec_nsec.ktsn_sec = ts.tv_sec & 0xffffffffUL;
    118 	kt.kt_sec_nsec.ktsn_nsec = ts.tv_nsec;
    119 
    120 	return kt;
    121 }
    122 
    123 static inline ktime_t
    124 ktime_get_real(void)
    125 {
    126 	struct timespec ts;
    127 	ktime_t kt;
    128 
    129 	nanotime(&ts);
    130 
    131 	/* XXX Silently truncate?  */
    132 	kt.kt_sec_nsec.ktsn_sec = ts.tv_sec & 0xffffffffUL;
    133 	kt.kt_sec_nsec.ktsn_nsec = ts.tv_nsec;
    134 
    135 	return kt;
    136 }
    137 
    138 static inline ktime_t
    139 ktime_get_monotonic_offset(void)
    140 {
    141 	return timespec_to_ktime(boottime);
    142 }
    143 
    144 static inline ktime_t
    145 ktime_mono_to_real(ktime_t kt)
    146 {
    147 	struct timespec ts = ktime_to_timespec(kt);
    148 
    149 	timespecadd(&ts, &boottime, &ts);
    150 
    151 	return timespec_to_ktime(ts);
    152 }
    153 
    154 static inline bool
    155 time_in_range(unsigned long x, unsigned long a, unsigned long b)
    156 {
    157 	return ((a <= x) && (x <= b));
    158 }
    159 
    160 #endif  /* _LINUX_KTIME_H_ */
    161