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Linux/include/asm-generic/cputime_nsecs.h

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  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
115 

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