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 cputime_one_jiffy               jiffies_to_cputime(1)
  25
  26 #define cputime_div(__ct, divisor)  div_u64((__force u64)__ct, divisor)
  27 #define cputime_div_rem(__ct, divisor, remainder) \
  28         div_u64_rem((__force u64)__ct, divisor, remainder);
  29
  30 /*
  31  * Convert cputime <-> jiffies (HZ)
  32  */
  33 #define cputime_to_jiffies(__ct)        \
  34         cputime_div(__ct, NSEC_PER_SEC / HZ)
  35 #define cputime_to_scaled(__ct)         (__ct)
  36 #define jiffies_to_cputime(__jif)       \
  37         (__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
  38 #define cputime64_to_jiffies64(__ct)    \
  39         cputime_div(__ct, NSEC_PER_SEC / HZ)
  40 #define jiffies64_to_cputime64(__jif)   \
  41         (__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ))
  42
  43
  44 /*
  45  * Convert cputime <-> nanoseconds
  46  */
  47 #define nsecs_to_cputime(__nsecs)       ((__force u64)(__nsecs))
  48
  49
  50 /*
  51  * Convert cputime <-> microseconds
  52  */
  53 #define cputime_to_usecs(__ct)          \
  54         cputime_div(__ct, NSEC_PER_USEC)
  55 #define usecs_to_cputime(__usecs)       \
  56         (__force cputime_t)((__usecs) * NSEC_PER_USEC)
  57 #define usecs_to_cputime64(__usecs)     \
  58         (__force cputime64_t)((__usecs) * NSEC_PER_USEC)
  59
  60 /*
  61  * Convert cputime <-> seconds
  62  */
  63 #define cputime_to_secs(__ct)           \
  64         cputime_div(__ct, NSEC_PER_SEC)
  65 #define secs_to_cputime(__secs)         \
  66         (__force cputime_t)((__secs) * NSEC_PER_SEC)
  67
  68 /*
  69  * Convert cputime <-> timespec (nsec)
  70  */
  71 static inline cputime_t timespec_to_cputime(const struct timespec *val)
  72 {
  73         u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
  74         return (__force cputime_t) ret;
  75 }
  76 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
  77 {
  78         u32 rem;
  79
  80         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
  81         val->tv_nsec = rem;
  82 }
  83
  84 /*
  85  * Convert cputime <-> timeval (msec)
  86  */
  87 static inline cputime_t timeval_to_cputime(const struct timeval *val)
  88 {
  89         u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_usec * NSEC_PER_USEC;
  90         return (__force cputime_t) ret;
  91 }
  92 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
  93 {
  94         u32 rem;
  95
  96         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
  97         val->tv_usec = rem / NSEC_PER_USEC;
  98 }
  99
 100 /*
 101  * Convert cputime <-> clock (USER_HZ)
 102  */
 103 #define cputime_to_clock_t(__ct)        \
 104         cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
 105 #define clock_t_to_cputime(__x)         \
 106         (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
 107
 108 /*
 109  * Convert cputime64 to clock.
 110  */
 111 #define cputime64_to_clock_t(__ct)      \
 112         cputime_to_clock_t((__force cputime_t)__ct)
 113
 114 #endif