include/asm-generic/cputime_nsecs.h

   1 /*
   2  * Definitions for measuring cputime in nsecs resolution.
   3  *
   4  * Based on <arch/ia64/include/asm/cputime.h>
   5  *
   6  * Copyright (C) 2007 FUJITSU LIMITED
   7  * Copyright (C) 2007 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  *
  14  */
  15
  16 #ifndef _ASM_GENERIC_CPUTIME_NSECS_H
  17 #define _ASM_GENERIC_CPUTIME_NSECS_H
  18
  19 #include <linux/math64.h>
  20
  21 typedef u64 __nocast cputime_t;
  22 typedef u64 __nocast cputime64_t;
  23
  24 #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
  25
  26 #define cputime_one_jiffy               jiffies_to_cputime(1)
  27
  28 #define cputime_div(__ct, divisor)  div_u64((__force u64)__ct, divisor)
  29 #define cputime_div_rem(__ct, divisor, remainder) \
  30         div_u64_rem((__force u64)__ct, divisor, remainder);
  31
  32 /*
  33  * Convert cputime <-> jiffies (HZ)
  34  */
  35 #define cputime_to_jiffies(__ct)        \
  36         cputime_div(__ct, NSEC_PER_SEC / HZ)
  37 #define cputime_to_scaled(__ct)         (__ct)
  38 #define jiffies_to_cputime(__jif)       \
  39         (__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
  40 #define cputime64_to_jiffies64(__ct)    \
  41         cputime_div(__ct, NSEC_PER_SEC / HZ)
  42 #define jiffies64_to_cputime64(__jif)   \
  43         (__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ))
  44
  45
  46 /*
  47  * Convert cputime <-> nanoseconds
  48  */
  49 #define cputime_to_nsecs(__ct)          \
  50         (__force u64)(__ct)
  51 #define nsecs_to_cputime(__nsecs)       \
  52         (__force cputime_t)(__nsecs)
  53 #define nsecs_to_cputime64(__nsecs)     \
  54         (__force cputime64_t)(__nsecs)
  55
  56
  57 /*
  58  * Convert cputime <-> microseconds
  59  */
  60 #define cputime_to_usecs(__ct)          \
  61         cputime_div(__ct, NSEC_PER_USEC)
  62 #define usecs_to_cputime(__usecs)       \
  63         (__force cputime_t)((__usecs) * NSEC_PER_USEC)
  64 #define usecs_to_cputime64(__usecs)     \
  65         (__force cputime64_t)((__usecs) * NSEC_PER_USEC)
  66
  67 /*
  68  * Convert cputime <-> seconds
  69  */
  70 #define cputime_to_secs(__ct)           \
  71         cputime_div(__ct, NSEC_PER_SEC)
  72 #define secs_to_cputime(__secs)         \
  73         (__force cputime_t)((__secs) * NSEC_PER_SEC)
  74
  75 /*
  76  * Convert cputime <-> timespec (nsec)
  77  */
  78 static inline cputime_t timespec_to_cputime(const struct timespec *val)
  79 {
  80         u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
  81         return (__force cputime_t) ret;
  82 }
  83 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
  84 {
  85         u32 rem;
  86
  87         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
  88         val->tv_nsec = rem;
  89 }
  90
  91 /*
  92  * Convert cputime <-> timeval (msec)
  93  */
  94 static inline cputime_t timeval_to_cputime(const struct timeval *val)
  95 {
  96         u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
  97                         val->tv_usec * NSEC_PER_USEC;
  98         return (__force cputime_t) ret;
  99 }
 100 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
 101 {
 102         u32 rem;
 103
 104         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
 105         val->tv_usec = rem / NSEC_PER_USEC;
 106 }
 107
 108 /*
 109  * Convert cputime <-> clock (USER_HZ)
 110  */
 111 #define cputime_to_clock_t(__ct)        \
 112         cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
 113 #define clock_t_to_cputime(__x)         \
 114         (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
 115
 116 /*
 117  * Convert cputime64 to clock.
 118  */
 119 #define cputime64_to_clock_t(__ct)      \
 120         cputime_to_clock_t((__force cputime_t)__ct)
 121
 122 #endif