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 jiffies_to_msecs(x) (((int64_t)(x)) * 1000 / hz) 39 #define msecs_to_jiffies(x) (((int64_t)(x)) * hz / 1000) 40 #define jiffies ticks 41 #define time_after(a,b) ((long)(b) - (long)(a) < 0) 42 #define time_after_eq(a,b) ((long)(b) - (long)(a) <= 0) 43 44 static inline unsigned long 45 timespec_to_jiffies(const struct timespec *ts) 46 { 47 unsigned long result; 48 49 result = ((unsigned long)hz * ts->tv_sec) + (ts->tv_nsec / NSEC_PER_SEC); 50 if (result > LONG_MAX) 51 result = LONG_MAX; 52 53 return result; 54 } 55 56 static inline 57 unsigned long usecs_to_jiffies(const unsigned int u) 58 { 59 unsigned long jiffies; 60 61 jiffies = (u * hz) / 1000000; 62 if (jiffies < 1) 63 return 1; 64 else 65 return jiffies; 66 } 67 68 #endif /* _LINUX_JIFFIES_H_ */ 69