1 /* 2 * Copyright (c) 2015-2019 François Tigeot <ftigeot@wolfpond.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_KTIME_H_ 28 #define _LINUX_KTIME_H_ 29 30 #include <linux/time.h> 31 #include <linux/jiffies.h> 32 33 /* time values in nanoseconds */ 34 typedef s64 ktime_t; 35 36 static inline ktime_t 37 ktime_set(const s64 secs, const unsigned long nsecs) 38 { 39 return (secs * NSEC_PER_SEC) + (s64)nsecs; 40 } 41 42 static inline s64 43 ktime_to_us(const ktime_t kt) 44 { 45 return kt / NSEC_PER_USEC; 46 } 47 48 static inline s64 49 ktime_us_delta(const ktime_t later, const ktime_t earlier) 50 { 51 return later - earlier; 52 } 53 54 static inline int64_t ktime_to_ns(ktime_t kt) 55 { 56 return kt; 57 } 58 59 static inline struct timeval ktime_to_timeval(ktime_t kt) 60 { 61 return ns_to_timeval(kt); 62 } 63 64 static inline ktime_t ktime_add_ns(ktime_t kt, int64_t ns) 65 { 66 return kt + ns; 67 } 68 69 static inline ktime_t ktime_sub_ns(ktime_t kt, int64_t ns) 70 { 71 return kt - ns; 72 } 73 74 static inline ktime_t ktime_get(void) 75 { 76 struct timespec ts; 77 78 nanouptime(&ts); 79 return (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec; 80 } 81 82 static inline ktime_t 83 ktime_sub(ktime_t lhs, ktime_t rhs) 84 { 85 return lhs - rhs; 86 } 87 88 static inline ktime_t 89 ns_to_ktime(u64 ns) 90 { 91 return ns; 92 } 93 94 #include <linux/timekeeping.h> 95 96 #endif /* _LINUX_KTIME_H_ */ 97