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 cputime_to_nsecs(__ct)          \
  48         (__force u64)(__ct)
  49 #define nsecs_to_cputime(__nsecs)       \
  50         (__force cputime_t)(__nsecs)
  51
  52
  53 /*
  54  * Convert cputime <-> microseconds
  55  */
  56 #define cputime_to_usecs(__ct)          \
  57         cputime_div(__ct, NSEC_PER_USEC)
  58 #define usecs_to_cputime(__usecs)       \
  59         (__force cputime_t)((__usecs) * NSEC_PER_USEC)
  60 #define usecs_to_cputime64(__usecs)     \
  61         (__force cputime64_t)((__usecs) * NSEC_PER_USEC)
  62
  63 /*
  64  * Convert cputime <-> seconds
  65  */
  66 #define cputime_to_secs(__ct)           \
  67         cputime_div(__ct, NSEC_PER_SEC)
  68 #define secs_to_cputime(__secs)         \
  69         (__force cputime_t)((__secs) * NSEC_PER_SEC)
  70
  71 /*
  72  * Convert cputime <-> timespec (nsec)
  73  */
  74 static inline cputime_t timespec_to_cputime(const struct timespec *val)
  75 {
  76         u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
  77         return (__force cputime_t) ret;
  78 }
  79 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
  80 {
  81         u32 rem;
  82
  83         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
  84         val->tv_nsec = rem;
  85 }
  86
  87 /*
  88  * Convert cputime <-> timeval (msec)
  89  */
  90 static inline cputime_t timeval_to_cputime(const struct timeval *val)
  91 {
  92         u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_usec * NSEC_PER_USEC;
  93         return (__force cputime_t) ret;
  94 }
  95 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
  96 {
  97         u32 rem;
  98
  99         val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
 100         val->tv_usec = rem / NSEC_PER_USEC;
 101 }
 102
 103 /*
 104  * Convert cputime <-> clock (USER_HZ)
 105  */
 106 #define cputime_to_clock_t(__ct)        \
 107         cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
 108 #define clock_t_to_cputime(__x)         \
 109         (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
 110
 111 /*
 112  * Convert cputime64 to clock.
 113  */
 114 #define cputime64_to_clock_t(__ct)      \
 115         cputime_to_clock_t((__force cputime_t)__ct)
 116
 117 #endif