1 /* 2 * Copyright (c) 2015 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 int64_t ktime_to_ns(ktime_t kt) 41 { 42 return kt.tv64; 43 } 44 45 static inline struct timeval ktime_to_timeval(ktime_t kt) 46 { 47 return ns_to_timeval(kt.tv64); 48 } 49 50 static inline ktime_t ktime_add_ns(ktime_t kt, int64_t ns) 51 { 52 ktime_t res; 53 54 res.tv64 = kt.tv64 + ns; 55 return kt; 56 } 57 58 static inline ktime_t ktime_sub_ns(ktime_t kt, int64_t ns) 59 { 60 ktime_t res; 61 62 res.tv64 = kt.tv64 - ns; 63 return kt; 64 } 65 66 #define NSEC_PER_SEC 1000000000L 67 68 static inline ktime_t ktime_get(void) 69 { 70 struct timespec ts; 71 ktime_t kt; 72 73 nanouptime(&ts); 74 kt.tv64 = (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec; 75 return kt; 76 } 77 78 #include <linux/timekeeping.h> 79 80 #endif /* _LINUX_KTIME_H_ */ 81