1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_TIME64_H
3 #define _LINUX_TIME64_H
4
5 #include <linux/math64.h>
6
7 typedef __s64 time64_t;
8 typedef __u64 timeu64_t;
9
10 /* CONFIG_64BIT_TIME enables new 64 bit time_t syscalls in the compat path
11 * and 32-bit emulation.
12 */
13 #ifndef CONFIG_64BIT_TIME
14 #define __kernel_timespec timespec
15 #define __kernel_itimerspec itimerspec
16 #endif
17
18 #include <uapi/linux/time.h>
19
20 struct timespec64 {
21 time64_t tv_sec; /* seconds */
22 long tv_nsec; /* nanoseconds */
23 };
24
25 struct itimerspec64 {
26 struct timespec64 it_interval;
27 struct timespec64 it_value;
28 };
29
30 /* Parameters used to convert the timespec values: */
31 #define MSEC_PER_SEC 1000L
32 #define USEC_PER_MSEC 1000L
33 #define NSEC_PER_USEC 1000L
34 #define NSEC_PER_MSEC 1000000L
35 #define USEC_PER_SEC 1000000L
36 #define NSEC_PER_SEC 1000000000L
37 #define FSEC_PER_SEC 1000000000000000LL
38
39 /* Located here for timespec[64]_valid_strict */
40 #define TIME64_MAX ((s64)~((u64)1 << 63))
41 #define KTIME_MAX ((s64)~((u64)1 << 63))
42 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
43
timespec64_equal(const struct timespec64 * a,const struct timespec64 * b)44 static inline int timespec64_equal(const struct timespec64 *a,
45 const struct timespec64 *b)
46 {
47 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
48 }
49
50 /*
51 * lhs < rhs: return <0
52 * lhs == rhs: return 0
53 * lhs > rhs: return >0
54 */
timespec64_compare(const struct timespec64 * lhs,const struct timespec64 * rhs)55 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
56 {
57 if (lhs->tv_sec < rhs->tv_sec)
58 return -1;
59 if (lhs->tv_sec > rhs->tv_sec)
60 return 1;
61 return lhs->tv_nsec - rhs->tv_nsec;
62 }
63
64 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
65
timespec64_add(struct timespec64 lhs,struct timespec64 rhs)66 static inline struct timespec64 timespec64_add(struct timespec64 lhs,
67 struct timespec64 rhs)
68 {
69 struct timespec64 ts_delta;
70 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
71 lhs.tv_nsec + rhs.tv_nsec);
72 return ts_delta;
73 }
74
75 /*
76 * sub = lhs - rhs, in normalized form
77 */
timespec64_sub(struct timespec64 lhs,struct timespec64 rhs)78 static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
79 struct timespec64 rhs)
80 {
81 struct timespec64 ts_delta;
82 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
83 lhs.tv_nsec - rhs.tv_nsec);
84 return ts_delta;
85 }
86
87 /*
88 * Returns true if the timespec64 is norm, false if denorm:
89 */
timespec64_valid(const struct timespec64 * ts)90 static inline bool timespec64_valid(const struct timespec64 *ts)
91 {
92 /* Dates before 1970 are bogus */
93 if (ts->tv_sec < 0)
94 return false;
95 /* Can't have more nanoseconds then a second */
96 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
97 return false;
98 return true;
99 }
100
timespec64_valid_strict(const struct timespec64 * ts)101 static inline bool timespec64_valid_strict(const struct timespec64 *ts)
102 {
103 if (!timespec64_valid(ts))
104 return false;
105 /* Disallow values that could overflow ktime_t */
106 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
107 return false;
108 return true;
109 }
110
111 /**
112 * timespec64_to_ns - Convert timespec64 to nanoseconds
113 * @ts: pointer to the timespec64 variable to be converted
114 *
115 * Returns the scalar nanosecond representation of the timespec64
116 * parameter.
117 */
timespec64_to_ns(const struct timespec64 * ts)118 static inline s64 timespec64_to_ns(const struct timespec64 *ts)
119 {
120 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
121 }
122
123 /**
124 * ns_to_timespec64 - Convert nanoseconds to timespec64
125 * @nsec: the nanoseconds value to be converted
126 *
127 * Returns the timespec64 representation of the nsec parameter.
128 */
129 extern struct timespec64 ns_to_timespec64(const s64 nsec);
130
131 /**
132 * timespec64_add_ns - Adds nanoseconds to a timespec64
133 * @a: pointer to timespec64 to be incremented
134 * @ns: unsigned nanoseconds value to be added
135 *
136 * This must always be inlined because its used from the x86-64 vdso,
137 * which cannot call other kernel functions.
138 */
timespec64_add_ns(struct timespec64 * a,u64 ns)139 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
140 {
141 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
142 a->tv_nsec = ns;
143 }
144
145 /*
146 * timespec64_add_safe assumes both values are positive and checks for
147 * overflow. It will return TIME64_MAX in case of overflow.
148 */
149 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
150 const struct timespec64 rhs);
151
152 #endif /* _LINUX_TIME64_H */
153
