1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_TIME64_H
3 #define _LINUX_TIME64_H
5 #include <uapi/linux/time.h>
6 #include <linux/math64.h>
8 typedef __s64 time64_t;
9 typedef __u64 timeu64_t;
12 * This wants to go into uapi/linux/time.h once we agreed about the
13 * userspace interfaces.
15 #if __BITS_PER_LONG == 64
16 # define timespec64 timespec
17 #define itimerspec64 itimerspec
20 time64_t tv_sec; /* seconds */
21 long tv_nsec; /* nanoseconds */
25 struct timespec64 it_interval;
26 struct timespec64 it_value;
31 /* Parameters used to convert the timespec values: */
32 #define MSEC_PER_SEC 1000L
33 #define USEC_PER_MSEC 1000L
34 #define NSEC_PER_USEC 1000L
35 #define NSEC_PER_MSEC 1000000L
36 #define USEC_PER_SEC 1000000L
37 #define NSEC_PER_SEC 1000000000L
38 #define FSEC_PER_SEC 1000000000000000LL
40 /* Located here for timespec[64]_valid_strict */
41 #define TIME64_MAX ((s64)~((u64)1 << 63))
42 #define KTIME_MAX ((s64)~((u64)1 << 63))
43 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
45 #if __BITS_PER_LONG == 64
47 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
52 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
57 static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
62 static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
67 # define timespec64_equal timespec_equal
68 # define timespec64_compare timespec_compare
69 # define set_normalized_timespec64 set_normalized_timespec
70 # define timespec64_add timespec_add
71 # define timespec64_sub timespec_sub
72 # define timespec64_valid timespec_valid
73 # define timespec64_valid_strict timespec_valid_strict
74 # define timespec64_to_ns timespec_to_ns
75 # define ns_to_timespec64 ns_to_timespec
76 # define timespec64_add_ns timespec_add_ns
80 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
84 ret.tv_sec = (time_t)ts64.tv_sec;
85 ret.tv_nsec = ts64.tv_nsec;
89 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
91 struct timespec64 ret;
93 ret.tv_sec = ts.tv_sec;
94 ret.tv_nsec = ts.tv_nsec;
98 static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
100 struct itimerspec ret;
102 ret.it_interval = timespec64_to_timespec(its64->it_interval);
103 ret.it_value = timespec64_to_timespec(its64->it_value);
107 static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
109 struct itimerspec64 ret;
111 ret.it_interval = timespec_to_timespec64(its->it_interval);
112 ret.it_value = timespec_to_timespec64(its->it_value);
116 static inline int timespec64_equal(const struct timespec64 *a,
117 const struct timespec64 *b)
119 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
123 * lhs < rhs: return <0
124 * lhs == rhs: return 0
125 * lhs > rhs: return >0
127 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
129 if (lhs->tv_sec < rhs->tv_sec)
131 if (lhs->tv_sec > rhs->tv_sec)
133 return lhs->tv_nsec - rhs->tv_nsec;
136 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
138 static inline struct timespec64 timespec64_add(struct timespec64 lhs,
139 struct timespec64 rhs)
141 struct timespec64 ts_delta;
142 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
143 lhs.tv_nsec + rhs.tv_nsec);
148 * sub = lhs - rhs, in normalized form
150 static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
151 struct timespec64 rhs)
153 struct timespec64 ts_delta;
154 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
155 lhs.tv_nsec - rhs.tv_nsec);
160 * Returns true if the timespec64 is norm, false if denorm:
162 static inline bool timespec64_valid(const struct timespec64 *ts)
164 /* Dates before 1970 are bogus */
167 /* Can't have more nanoseconds then a second */
168 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
173 static inline bool timespec64_valid_strict(const struct timespec64 *ts)
175 if (!timespec64_valid(ts))
177 /* Disallow values that could overflow ktime_t */
178 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
184 * timespec64_to_ns - Convert timespec64 to nanoseconds
185 * @ts: pointer to the timespec64 variable to be converted
187 * Returns the scalar nanosecond representation of the timespec64
190 static inline s64 timespec64_to_ns(const struct timespec64 *ts)
192 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
196 * ns_to_timespec64 - Convert nanoseconds to timespec64
197 * @nsec: the nanoseconds value to be converted
199 * Returns the timespec64 representation of the nsec parameter.
201 extern struct timespec64 ns_to_timespec64(const s64 nsec);
204 * timespec64_add_ns - Adds nanoseconds to a timespec64
205 * @a: pointer to timespec64 to be incremented
206 * @ns: unsigned nanoseconds value to be added
208 * This must always be inlined because its used from the x86-64 vdso,
209 * which cannot call other kernel functions.
211 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
213 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
220 * timespec64_add_safe assumes both values are positive and checks for
221 * overflow. It will return TIME64_MAX in case of overflow.
223 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
224 const struct timespec64 rhs);
226 #endif /* _LINUX_TIME64_H */