1 /* $NetBSD: jiffies.h,v 1.13 2020/02/14 14:34:59 maya Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LINUX_JIFFIES_H_ 33 #define _LINUX_JIFFIES_H_ 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 38 #include <asm/param.h> /* HZ */ 39 40 #include <linux/math64.h> 41 42 #define jiffies hardclock_ticks 43 #define jiffies_64 hardclock_ticks /* XXX */ 44 45 /* XXX Er, what? */ 46 #define MAX_JIFFY_OFFSET ((INT_MAX >> 1) - 1) 47 48 static inline uint64_t 49 get_jiffies_64(void) 50 { 51 52 return (uint64_t)(unsigned)hardclock_ticks; 53 } 54 55 static inline uint64_t 56 nsecs_to_jiffies64(uint64_t nsec) 57 { 58 59 /* XXX Arbitrary cutoff, should review the arithmetic. */ 60 if (((1000000000 % hz) == 0) || (nsec >= 20000000000ul)) 61 return (nsec/1000000000)*hz; 62 else 63 return (nsec*hz)/1000000000; 64 } 65 66 static inline uint32_t 67 nsecs_to_jiffies(uint64_t nsec) 68 { 69 70 /* XXX Not sure what else to do but truncate... */ 71 return (uint32_t)nsecs_to_jiffies64(nsec); 72 } 73 74 static inline unsigned int 75 msecs_to_jiffies(unsigned int msec) 76 { 77 return mstohz(msec); 78 } 79 80 static inline unsigned int 81 jiffies_to_msecs(unsigned int j) 82 { 83 return hztoms(j); 84 } 85 86 static inline unsigned int 87 usecs_to_jiffies(unsigned int usec) 88 { 89 const struct timeval tv = { 90 .tv_sec = usec / 1000000, 91 .tv_usec = usec % 1000000, 92 }; 93 94 return tvtohz(&tv); 95 } 96 97 static inline unsigned int 98 jiffies_to_usecs(unsigned int j) 99 { 100 101 /* XXX Do better arithmetic. */ 102 return (unsigned int)((unsigned long)j*1000000/hz); 103 } 104 105 static inline unsigned int 106 timespec_to_jiffies(const struct timespec *ts) 107 { 108 return tstohz(ts); 109 } 110 111 /* XXX long is the wrong type here times... */ 112 113 #define __linux_time_compare(A, OP, B) (((long)(A) - (long)(B)) OP 0) 114 115 static inline bool 116 time_after(unsigned long a, unsigned long b) 117 { 118 return __linux_time_compare(a, >, b); 119 } 120 121 static inline bool 122 time_after_eq(unsigned long a, unsigned long b) 123 { 124 return __linux_time_compare(a, >=, b); 125 } 126 127 static inline bool 128 time_before(unsigned long a, unsigned long b) 129 { 130 return __linux_time_compare(a, <, b); 131 } 132 133 static inline bool 134 time_before_eq(unsigned long a, unsigned long b) 135 { 136 return __linux_time_compare(a, <=, b); 137 } 138 139 #endif /* _LINUX_JIFFIES_H_ */ 140