sys/dev/drm/include/linux/time.h

   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_TIME_H_
  28 #define _LINUX_TIME_H_
  29
  30 #define USEC_PER_SEC    1000000L
  31
  32 #define NSEC_PER_USEC   1000L
  33 #define NSEC_PER_MSEC   1000000L
  34 #define NSEC_PER_SEC    1000000000L
  35
  36 #include <linux/cache.h>
  37 #include <linux/math64.h>
  38
  39 #include <sys/time.h>
  40
  41 static inline struct timeval
  42 ns_to_timeval(const int64_t nsec)
  43 {
  44         struct timeval tv;
  45         long rem;
  46
  47         if (nsec == 0) {
  48                 tv.tv_sec = 0;
  49                 tv.tv_usec = 0;
  50                 return (tv);
  51         }
  52
  53         tv.tv_sec = nsec / NSEC_PER_SEC;
  54         rem = nsec % NSEC_PER_SEC;
  55         if (rem < 0) {
  56                 tv.tv_sec--;
  57                 rem += NSEC_PER_SEC;
  58         }
  59         tv.tv_usec = rem / 1000;
  60         return (tv);
  61 }
  62
  63 static inline int64_t
  64 timeval_to_ns(const struct timeval *tv)
  65 {
  66         return ((int64_t)tv->tv_sec * NSEC_PER_SEC) +
  67                 tv->tv_usec * NSEC_PER_USEC;
  68 }
  69
  70 #define getrawmonotonic(ts)     nanouptime(ts)
  71
  72 static inline struct timespec
  73 timespec_sub(struct timespec lhs, struct timespec rhs)
  74 {
  75         struct timespec ts;
  76
  77         ts.tv_sec = lhs.tv_sec;
  78         ts.tv_nsec = lhs.tv_nsec;
  79         timespecsub(&ts, &rhs);
  80
  81         return ts;
  82 }
  83
  84 static inline void
  85 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
  86 {
  87         /* XXX: this doesn't actually normalize anything */
  88         ts->tv_sec = sec;
  89         ts->tv_nsec = nsec;
  90 }
  91
  92 static inline int64_t
  93 timespec_to_ns(const struct timespec *ts)
  94 {
  95         return ((ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec);
  96 }
  97
  98 static inline struct timespec
  99 ns_to_timespec(const int64_t nsec)
 100 {
 101         struct timespec ts;
 102         int32_t rem;
 103
 104         if (nsec == 0) {
 105                 ts.tv_sec = 0;
 106                 ts.tv_nsec = 0;
 107                 return (ts);
 108         }
 109
 110         ts.tv_sec = nsec / NSEC_PER_SEC;
 111         rem = nsec % NSEC_PER_SEC;
 112         if (rem < 0) {
 113                 ts.tv_sec--;
 114                 rem += NSEC_PER_SEC;
 115         }
 116         ts.tv_nsec = rem;
 117         return (ts);
 118 }
 119
 120 static inline int
 121 timespec_valid(const struct timespec *ts)
 122 {
 123         if (ts->tv_sec < 0 || ts->tv_sec > 100000000 ||
 124             ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
 125                 return (0);
 126         return (1);
 127 }
 128
 129 static inline unsigned long
 130 get_seconds(void)
 131 {
 132         return time_uptime;
 133 }
 134
 135 #endif  /* _LINUX_TIME_H_ */