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
  54
  55 /*
  56  * Convert cputime <-> microseconds
  57  */
  58 #define cputime_to_usecs(__ct)          \
  59         cputime_div(__ct, NSEC_PER_USEC)
  60 #define usecs_to_cputime(__usecs)       \
  61         (__force cputime_t)((__usecs) * NSEC_PER_USEC)
  62 #define usecs_to_cputime64(__usecs)     \
  63         (__force cputime64_t)((__usecs) * NSEC_PER_USEC)
  64
  65 /*
  66  * Convert cputime <-> seconds
  67  */
  68 #define cputime_to_secs(__ct)           \
  69         cputime_div(__ct, NSEC_PER_SEC)
  70 #define secs_to_cputime(__secs)         \
  71         (__force cputime_t)((__secs) * NSEC_PER_SEC)
  72
  73 /*
  74  * Convert cputime <-> timespec (nsec)
  75  */
  76 static inline cputime_t timespec_to_cputime(const struct timespec *val)
  77 {
  78         u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
  79         return (__force cputime_t) ret;
  80 }
  81 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
  82 {
  83         u32 rem;
  84
  85         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
  86         val->tv_nsec = rem;
  87 }
  88
  89 /*
  90  * Convert cputime <-> timeval (msec)
  91  */
  92 static inline cputime_t timeval_to_cputime(const struct timeval *val)
  93 {
  94         u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
  95                         val->tv_usec * NSEC_PER_USEC;
  96         return (__force cputime_t) ret;
  97 }
  98 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
  99 {
 100         u32 rem;
 101
 102         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
 103         val->tv_usec = rem / NSEC_PER_USEC;
 104 }
 105
 106 /*
 107  * Convert cputime <-> clock (USER_HZ)
 108  */
 109 #define cputime_to_clock_t(__ct)        \
 110         cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
 111 #define clock_t_to_cputime(__x)         \
 112         (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
 113
 114 /*
 115  * Convert cputime64 to clock.
 116  */
 117 #define cputime64_to_clock_t(__ct)      \
 118         cputime_to_clock_t((__force cputime_t)__ct)
 119
 120 #endif