1 /* 2 * Copyright (c) 2015-2016 François Tigeot 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 union ktime { 35 int64_t tv64; 36 }; 37 38 typedef union ktime ktime_t; 39 40 static inline s64 41 ktime_to_us(const ktime_t kt) 42 { 43 return kt.tv64 / NSEC_PER_USEC; 44 } 45 46 static inline s64 47 ktime_us_delta(const ktime_t later, const ktime_t earlier) 48 { 49 return later.tv64 - earlier.tv64; 50 } 51 52 static inline int64_t ktime_to_ns(ktime_t kt) 53 { 54 return kt.tv64; 55 } 56 57 static inline struct timeval ktime_to_timeval(ktime_t kt) 58 { 59 return ns_to_timeval(kt.tv64); 60 } 61 62 static inline ktime_t ktime_add_ns(ktime_t kt, int64_t ns) 63 { 64 ktime_t res; 65 66 res.tv64 = kt.tv64 + ns; 67 return kt; 68 } 69 70 static inline ktime_t ktime_sub_ns(ktime_t kt, int64_t ns) 71 { 72 ktime_t res; 73 74 res.tv64 = kt.tv64 - ns; 75 return kt; 76 } 77 78 #define NSEC_PER_SEC 1000000000L 79 80 static inline ktime_t ktime_get(void) 81 { 82 struct timespec ts; 83 ktime_t kt; 84 85 nanouptime(&ts); 86 kt.tv64 = (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec; 87 return kt; 88 } 89 90 #include <linux/timekeeping.h> 91 92 #endif /* _LINUX_KTIME_H_ */ 93