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 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 */
76static 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}
81static 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 */
92static 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}
98static 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
121