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
 21typedef u64 __nocast cputime_t;
 22typedef 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 jiffies_to_cputime(__jif)	\
 38	(__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
 39#define cputime64_to_jiffies64(__ct)	\
 40	cputime_div(__ct, NSEC_PER_SEC / HZ)
 41#define jiffies64_to_cputime64(__jif)	\
 42	(__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ))
 43
 44
 45/*
 46 * Convert cputime <-> nanoseconds
 47 */
 48#define cputime_to_nsecs(__ct)		\
 49	(__force u64)(__ct)
 50#define nsecs_to_cputime(__nsecs)	\
 51	(__force cputime_t)(__nsecs)
 52#define nsecs_to_cputime64(__nsecs)	\
 53	(__force cputime64_t)(__nsecs)
 54
 55
 56/*
 57 * Convert cputime <-> microseconds
 58 */
 59#define cputime_to_usecs(__ct)		\
 60	cputime_div(__ct, NSEC_PER_USEC)
 61#define usecs_to_cputime(__usecs)	\
 62	(__force cputime_t)((__usecs) * NSEC_PER_USEC)
 63#define usecs_to_cputime64(__usecs)	\
 64	(__force cputime64_t)((__usecs) * NSEC_PER_USEC)
 65
 66/*
 67 * Convert cputime <-> seconds
 68 */
 69#define cputime_to_secs(__ct)		\
 70	cputime_div(__ct, NSEC_PER_SEC)
 71#define secs_to_cputime(__secs)		\
 72	(__force cputime_t)((__secs) * NSEC_PER_SEC)
 73
 74/*
 75 * Convert cputime <-> timespec (nsec)
 76 */
 77static inline cputime_t timespec_to_cputime(const struct timespec *val)
 78{
 79	u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
 80	return (__force cputime_t) ret;
 81}
 82static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
 83{
 84	u32 rem;
 85
 86	val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
 87	val->tv_nsec = rem;
 88}
 89
 90/*
 91 * Convert cputime <-> timeval (msec)
 92 */
 93static inline cputime_t timeval_to_cputime(const struct timeval *val)
 94{
 95	u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
 96			val->tv_usec * NSEC_PER_USEC;
 97	return (__force cputime_t) ret;
 98}
 99static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
100{
101	u32 rem;
102
103	val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
104	val->tv_usec = rem / NSEC_PER_USEC;
105}
106
107/*
108 * Convert cputime <-> clock (USER_HZ)
109 */
110#define cputime_to_clock_t(__ct)	\
111	cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
112#define clock_t_to_cputime(__x)		\
113	(__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
114
115/*
116 * Convert cputime64 to clock.
117 */
118#define cputime64_to_clock_t(__ct)	\
119	cputime_to_clock_t((__force cputime_t)__ct)
120
121#endif