1 #ifndef _LINUX_TIME64_H
2 #define _LINUX_TIME64_H
4 #include <uapi/linux/time.h>
5 #include <linux/math64.h>
7 typedef __s64 time64_t
;
10 * This wants to go into uapi/linux/time.h once we agreed about the
11 * userspace interfaces.
13 #if __BITS_PER_LONG == 64
14 # define timespec64 timespec
17 time64_t tv_sec
; /* seconds */
18 long tv_nsec
; /* nanoseconds */
22 /* Parameters used to convert the timespec values: */
23 #define MSEC_PER_SEC 1000L
24 #define USEC_PER_MSEC 1000L
25 #define NSEC_PER_USEC 1000L
26 #define NSEC_PER_MSEC 1000000L
27 #define USEC_PER_SEC 1000000L
28 #define NSEC_PER_SEC 1000000000L
29 #define FSEC_PER_SEC 1000000000000000LL
31 /* Located here for timespec[64]_valid_strict */
32 #define TIME64_MAX ((s64)~((u64)1 << 63))
33 #define KTIME_MAX ((s64)~((u64)1 << 63))
34 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
36 #if __BITS_PER_LONG == 64
38 static inline struct timespec
timespec64_to_timespec(const struct timespec64 ts64
)
43 static inline struct timespec64
timespec_to_timespec64(const struct timespec ts
)
48 # define timespec64_equal timespec_equal
49 # define timespec64_compare timespec_compare
50 # define set_normalized_timespec64 set_normalized_timespec
51 # define timespec64_add_safe timespec_add_safe
52 # define timespec64_add timespec_add
53 # define timespec64_sub timespec_sub
54 # define timespec64_valid timespec_valid
55 # define timespec64_valid_strict timespec_valid_strict
56 # define timespec64_to_ns timespec_to_ns
57 # define ns_to_timespec64 ns_to_timespec
58 # define timespec64_add_ns timespec_add_ns
62 static inline struct timespec
timespec64_to_timespec(const struct timespec64 ts64
)
66 ret
.tv_sec
= (time_t)ts64
.tv_sec
;
67 ret
.tv_nsec
= ts64
.tv_nsec
;
71 static inline struct timespec64
timespec_to_timespec64(const struct timespec ts
)
73 struct timespec64 ret
;
75 ret
.tv_sec
= ts
.tv_sec
;
76 ret
.tv_nsec
= ts
.tv_nsec
;
80 static inline int timespec64_equal(const struct timespec64
*a
,
81 const struct timespec64
*b
)
83 return (a
->tv_sec
== b
->tv_sec
) && (a
->tv_nsec
== b
->tv_nsec
);
87 * lhs < rhs: return <0
88 * lhs == rhs: return 0
89 * lhs > rhs: return >0
91 static inline int timespec64_compare(const struct timespec64
*lhs
, const struct timespec64
*rhs
)
93 if (lhs
->tv_sec
< rhs
->tv_sec
)
95 if (lhs
->tv_sec
> rhs
->tv_sec
)
97 return lhs
->tv_nsec
- rhs
->tv_nsec
;
100 extern void set_normalized_timespec64(struct timespec64
*ts
, time64_t sec
, s64 nsec
);
103 * timespec64_add_safe assumes both values are positive and checks for
104 * overflow. It will return TIME_T_MAX if the returned value would be
105 * smaller then either of the arguments.
107 extern struct timespec64
timespec64_add_safe(const struct timespec64 lhs
,
108 const struct timespec64 rhs
);
111 static inline struct timespec64
timespec64_add(struct timespec64 lhs
,
112 struct timespec64 rhs
)
114 struct timespec64 ts_delta
;
115 set_normalized_timespec64(&ts_delta
, lhs
.tv_sec
+ rhs
.tv_sec
,
116 lhs
.tv_nsec
+ rhs
.tv_nsec
);
121 * sub = lhs - rhs, in normalized form
123 static inline struct timespec64
timespec64_sub(struct timespec64 lhs
,
124 struct timespec64 rhs
)
126 struct timespec64 ts_delta
;
127 set_normalized_timespec64(&ts_delta
, lhs
.tv_sec
- rhs
.tv_sec
,
128 lhs
.tv_nsec
- rhs
.tv_nsec
);
133 * Returns true if the timespec64 is norm, false if denorm:
135 static inline bool timespec64_valid(const struct timespec64
*ts
)
137 /* Dates before 1970 are bogus */
140 /* Can't have more nanoseconds then a second */
141 if ((unsigned long)ts
->tv_nsec
>= NSEC_PER_SEC
)
146 static inline bool timespec64_valid_strict(const struct timespec64
*ts
)
148 if (!timespec64_valid(ts
))
150 /* Disallow values that could overflow ktime_t */
151 if ((unsigned long long)ts
->tv_sec
>= KTIME_SEC_MAX
)
157 * timespec64_to_ns - Convert timespec64 to nanoseconds
158 * @ts: pointer to the timespec64 variable to be converted
160 * Returns the scalar nanosecond representation of the timespec64
163 static inline s64
timespec64_to_ns(const struct timespec64
*ts
)
165 return ((s64
) ts
->tv_sec
* NSEC_PER_SEC
) + ts
->tv_nsec
;
169 * ns_to_timespec64 - Convert nanoseconds to timespec64
170 * @nsec: the nanoseconds value to be converted
172 * Returns the timespec64 representation of the nsec parameter.
174 extern struct timespec64
ns_to_timespec64(const s64 nsec
);
177 * timespec64_add_ns - Adds nanoseconds to a timespec64
178 * @a: pointer to timespec64 to be incremented
179 * @ns: unsigned nanoseconds value to be added
181 * This must always be inlined because its used from the x86-64 vdso,
182 * which cannot call other kernel functions.
184 static __always_inline
void timespec64_add_ns(struct timespec64
*a
, u64 ns
)
186 a
->tv_sec
+= __iter_div_u64_rem(a
->tv_nsec
+ ns
, NSEC_PER_SEC
, &ns
);
192 #endif /* _LINUX_TIME64_H */
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