1 /* 2 * Copyright (c) 2014-2015 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_JIFFIES_H_ 28 #define _LINUX_JIFFIES_H_ 29 30 #include <sys/kernel.h> 31 #include <machine/limits.h> 32 33 #include <linux/math64.h> 34 #include <linux/time.h> 35 36 #define HZ hz 37 38 #define MAX_JIFFY_OFFSET ((LONG_MAX >> 1) - 1) 39 40 #define jiffies_to_msecs(x) (((int64_t)(x)) * 1000 / hz) 41 #define msecs_to_jiffies(x) (((int64_t)(x)) * hz / 1000) 42 #define jiffies ticks 43 #define time_after(a,b) ((long)(b) - (long)(a) < 0) 44 #define time_after_eq(a,b) ((long)(b) - (long)(a) <= 0) 45 46 #define time_before(a,b) time_after(b,a) 47 #define time_before_eq(a,b) time_after_eq(b,a) 48 49 #define time_in_range(a,b,c) \ 50 time_after_eq(a,b) && time_before_eq(a,c) 51 52 static inline unsigned long 53 timespec_to_jiffies(const struct timespec *ts) 54 { 55 unsigned long result; 56 57 result = ((unsigned long)hz * ts->tv_sec) + (ts->tv_nsec / NSEC_PER_SEC); 58 if (result > LONG_MAX) 59 result = LONG_MAX; 60 61 return result; 62 } 63 64 static inline 65 unsigned long usecs_to_jiffies(const unsigned int u) 66 { 67 unsigned long jiffies; 68 69 jiffies = (u * hz) / 1000000; 70 if (jiffies < 1) 71 return 1; 72 else 73 return jiffies; 74 } 75 76 #endif /* _LINUX_JIFFIES_H_ */ 77