1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_TIME64_H
3 #define _LINUX_TIME64_H
5 #include <linux/math64.h>
7 typedef __s64 time64_t;
8 typedef __u64 timeu64_t;
10 /* CONFIG_64BIT_TIME enables new 64 bit time_t syscalls in the compat path
11 * and 32-bit emulation.
13 #ifndef CONFIG_64BIT_TIME
14 #define __kernel_timespec timespec
17 #include <uapi/linux/time.h>
20 time64_t tv_sec; /* seconds */
21 long tv_nsec; /* nanoseconds */
25 struct timespec64 it_interval;
26 struct timespec64 it_value;
29 /* Parameters used to convert the timespec values: */
30 #define MSEC_PER_SEC 1000L
31 #define USEC_PER_MSEC 1000L
32 #define NSEC_PER_USEC 1000L
33 #define NSEC_PER_MSEC 1000000L
34 #define USEC_PER_SEC 1000000L
35 #define NSEC_PER_SEC 1000000000L
36 #define FSEC_PER_SEC 1000000000000000LL
38 /* Located here for timespec[64]_valid_strict */
39 #define TIME64_MAX ((s64)~((u64)1 << 63))
40 #define KTIME_MAX ((s64)~((u64)1 << 63))
41 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
43 static inline int timespec64_equal(const struct timespec64 *a,
44 const struct timespec64 *b)
46 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
50 * lhs < rhs: return <0
51 * lhs == rhs: return 0
52 * lhs > rhs: return >0
54 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
56 if (lhs->tv_sec < rhs->tv_sec)
58 if (lhs->tv_sec > rhs->tv_sec)
60 return lhs->tv_nsec - rhs->tv_nsec;
63 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
65 static inline struct timespec64 timespec64_add(struct timespec64 lhs,
66 struct timespec64 rhs)
68 struct timespec64 ts_delta;
69 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
70 lhs.tv_nsec + rhs.tv_nsec);
75 * sub = lhs - rhs, in normalized form
77 static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
78 struct timespec64 rhs)
80 struct timespec64 ts_delta;
81 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
82 lhs.tv_nsec - rhs.tv_nsec);
87 * Returns true if the timespec64 is norm, false if denorm:
89 static inline bool timespec64_valid(const struct timespec64 *ts)
91 /* Dates before 1970 are bogus */
94 /* Can't have more nanoseconds then a second */
95 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
100 static inline bool timespec64_valid_strict(const struct timespec64 *ts)
102 if (!timespec64_valid(ts))
104 /* Disallow values that could overflow ktime_t */
105 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
111 * timespec64_to_ns - Convert timespec64 to nanoseconds
112 * @ts: pointer to the timespec64 variable to be converted
114 * Returns the scalar nanosecond representation of the timespec64
117 static inline s64 timespec64_to_ns(const struct timespec64 *ts)
119 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
123 * ns_to_timespec64 - Convert nanoseconds to timespec64
124 * @nsec: the nanoseconds value to be converted
126 * Returns the timespec64 representation of the nsec parameter.
128 extern struct timespec64 ns_to_timespec64(const s64 nsec);
131 * timespec64_add_ns - Adds nanoseconds to a timespec64
132 * @a: pointer to timespec64 to be incremented
133 * @ns: unsigned nanoseconds value to be added
135 * This must always be inlined because its used from the x86-64 vdso,
136 * which cannot call other kernel functions.
138 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
140 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
145 * timespec64_add_safe assumes both values are positive and checks for
146 * overflow. It will return TIME64_MAX in case of overflow.
148 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
149 const struct timespec64 rhs);
151 #endif /* _LINUX_TIME64_H */