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 KTIME_MAX ((s64)~((u64)1 << 63))
33 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
35 #if __BITS_PER_LONG == 64
37 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
42 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
47 # define timespec64_equal timespec_equal
48 # define timespec64_compare timespec_compare
49 # define set_normalized_timespec64 set_normalized_timespec
50 # define timespec64_add_safe timespec_add_safe
51 # define timespec64_add timespec_add
52 # define timespec64_sub timespec_sub
53 # define timespec64_valid timespec_valid
54 # define timespec64_valid_strict timespec_valid_strict
55 # define timespec64_to_ns timespec_to_ns
56 # define ns_to_timespec64 ns_to_timespec
57 # define timespec64_add_ns timespec_add_ns
61 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
65 ret.tv_sec = (time_t)ts64.tv_sec;
66 ret.tv_nsec = ts64.tv_nsec;
70 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
72 struct timespec64 ret;
74 ret.tv_sec = ts.tv_sec;
75 ret.tv_nsec = ts.tv_nsec;
79 static inline int timespec64_equal(const struct timespec64 *a,
80 const struct timespec64 *b)
82 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
86 * lhs < rhs: return <0
87 * lhs == rhs: return 0
88 * lhs > rhs: return >0
90 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
92 if (lhs->tv_sec < rhs->tv_sec)
94 if (lhs->tv_sec > rhs->tv_sec)
96 return lhs->tv_nsec - rhs->tv_nsec;
99 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
102 * timespec64_add_safe assumes both values are positive and checks for
103 * overflow. It will return TIME_T_MAX if the returned value would be
104 * smaller then either of the arguments.
106 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
107 const struct timespec64 rhs);
110 static inline struct timespec64 timespec64_add(struct timespec64 lhs,
111 struct timespec64 rhs)
113 struct timespec64 ts_delta;
114 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
115 lhs.tv_nsec + rhs.tv_nsec);
120 * sub = lhs - rhs, in normalized form
122 static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
123 struct timespec64 rhs)
125 struct timespec64 ts_delta;
126 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
127 lhs.tv_nsec - rhs.tv_nsec);
132 * Returns true if the timespec64 is norm, false if denorm:
134 static inline bool timespec64_valid(const struct timespec64 *ts)
136 /* Dates before 1970 are bogus */
139 /* Can't have more nanoseconds then a second */
140 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
145 static inline bool timespec64_valid_strict(const struct timespec64 *ts)
147 if (!timespec64_valid(ts))
149 /* Disallow values that could overflow ktime_t */
150 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
156 * timespec64_to_ns - Convert timespec64 to nanoseconds
157 * @ts: pointer to the timespec64 variable to be converted
159 * Returns the scalar nanosecond representation of the timespec64
162 static inline s64 timespec64_to_ns(const struct timespec64 *ts)
164 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
168 * ns_to_timespec64 - Convert nanoseconds to timespec64
169 * @nsec: the nanoseconds value to be converted
171 * Returns the timespec64 representation of the nsec parameter.
173 extern struct timespec64 ns_to_timespec64(const s64 nsec);
176 * timespec64_add_ns - Adds nanoseconds to a timespec64
177 * @a: pointer to timespec64 to be incremented
178 * @ns: unsigned nanoseconds value to be added
180 * This must always be inlined because its used from the x86-64 vdso,
181 * which cannot call other kernel functions.
183 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
185 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
191 #endif /* _LINUX_TIME64_H */