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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
361a3bf0 JS |
2 | #ifndef _LINUX_TIME64_H |
3 | #define _LINUX_TIME64_H | |
4 | ||
5 | #include <uapi/linux/time.h> | |
30f3b3f9 | 6 | #include <linux/math64.h> |
361a3bf0 JS |
7 | |
8 | typedef __s64 time64_t; | |
469e857f | 9 | typedef __u64 timeu64_t; |
361a3bf0 | 10 | |
361a3bf0 | 11 | #if __BITS_PER_LONG == 64 |
abc8f96e | 12 | /* this trick allows us to optimize out timespec64_to_timespec */ |
361a3bf0 | 13 | # define timespec64 timespec |
19a46fe5 | 14 | #define itimerspec64 itimerspec |
361a3bf0 JS |
15 | #else |
16 | struct timespec64 { | |
17 | time64_t tv_sec; /* seconds */ | |
18 | long tv_nsec; /* nanoseconds */ | |
19 | }; | |
19a46fe5 BW |
20 | |
21 | struct itimerspec64 { | |
22 | struct timespec64 it_interval; | |
23 | struct timespec64 it_value; | |
24 | }; | |
25 | ||
361a3bf0 JS |
26 | #endif |
27 | ||
28 | /* Parameters used to convert the timespec values: */ | |
29 | #define MSEC_PER_SEC 1000L | |
30 | #define USEC_PER_MSEC 1000L | |
31 | #define NSEC_PER_USEC 1000L | |
32 | #define NSEC_PER_MSEC 1000000L | |
33 | #define USEC_PER_SEC 1000000L | |
34 | #define NSEC_PER_SEC 1000000000L | |
35 | #define FSEC_PER_SEC 1000000000000000LL | |
36 | ||
37 | /* Located here for timespec[64]_valid_strict */ | |
833f32d7 | 38 | #define TIME64_MAX ((s64)~((u64)1 << 63)) |
361a3bf0 JS |
39 | #define KTIME_MAX ((s64)~((u64)1 << 63)) |
40 | #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) | |
41 | ||
361a3bf0 JS |
42 | static inline int timespec64_equal(const struct timespec64 *a, |
43 | const struct timespec64 *b) | |
44 | { | |
45 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); | |
46 | } | |
47 | ||
48 | /* | |
49 | * lhs < rhs: return <0 | |
50 | * lhs == rhs: return 0 | |
51 | * lhs > rhs: return >0 | |
52 | */ | |
53 | static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) | |
54 | { | |
55 | if (lhs->tv_sec < rhs->tv_sec) | |
56 | return -1; | |
57 | if (lhs->tv_sec > rhs->tv_sec) | |
58 | return 1; | |
59 | return lhs->tv_nsec - rhs->tv_nsec; | |
60 | } | |
61 | ||
62 | extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); | |
63 | ||
361a3bf0 JS |
64 | static inline struct timespec64 timespec64_add(struct timespec64 lhs, |
65 | struct timespec64 rhs) | |
66 | { | |
67 | struct timespec64 ts_delta; | |
68 | set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, | |
69 | lhs.tv_nsec + rhs.tv_nsec); | |
70 | return ts_delta; | |
71 | } | |
72 | ||
73 | /* | |
74 | * sub = lhs - rhs, in normalized form | |
75 | */ | |
76 | static inline struct timespec64 timespec64_sub(struct timespec64 lhs, | |
77 | struct timespec64 rhs) | |
78 | { | |
79 | struct timespec64 ts_delta; | |
80 | set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
81 | lhs.tv_nsec - rhs.tv_nsec); | |
82 | return ts_delta; | |
83 | } | |
84 | ||
85 | /* | |
86 | * Returns true if the timespec64 is norm, false if denorm: | |
87 | */ | |
88 | static inline bool timespec64_valid(const struct timespec64 *ts) | |
89 | { | |
90 | /* Dates before 1970 are bogus */ | |
91 | if (ts->tv_sec < 0) | |
92 | return false; | |
93 | /* Can't have more nanoseconds then a second */ | |
94 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
95 | return false; | |
96 | return true; | |
97 | } | |
98 | ||
99 | static inline bool timespec64_valid_strict(const struct timespec64 *ts) | |
100 | { | |
101 | if (!timespec64_valid(ts)) | |
102 | return false; | |
103 | /* Disallow values that could overflow ktime_t */ | |
104 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) | |
105 | return false; | |
106 | return true; | |
107 | } | |
108 | ||
109 | /** | |
110 | * timespec64_to_ns - Convert timespec64 to nanoseconds | |
111 | * @ts: pointer to the timespec64 variable to be converted | |
112 | * | |
113 | * Returns the scalar nanosecond representation of the timespec64 | |
114 | * parameter. | |
115 | */ | |
116 | static inline s64 timespec64_to_ns(const struct timespec64 *ts) | |
117 | { | |
118 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; | |
119 | } | |
120 | ||
121 | /** | |
122 | * ns_to_timespec64 - Convert nanoseconds to timespec64 | |
123 | * @nsec: the nanoseconds value to be converted | |
124 | * | |
125 | * Returns the timespec64 representation of the nsec parameter. | |
126 | */ | |
127 | extern struct timespec64 ns_to_timespec64(const s64 nsec); | |
128 | ||
129 | /** | |
130 | * timespec64_add_ns - Adds nanoseconds to a timespec64 | |
131 | * @a: pointer to timespec64 to be incremented | |
132 | * @ns: unsigned nanoseconds value to be added | |
133 | * | |
134 | * This must always be inlined because its used from the x86-64 vdso, | |
135 | * which cannot call other kernel functions. | |
136 | */ | |
137 | static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) | |
138 | { | |
139 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); | |
140 | a->tv_nsec = ns; | |
141 | } | |
142 | ||
8e4f70e2 DD |
143 | /* |
144 | * timespec64_add_safe assumes both values are positive and checks for | |
145 | * overflow. It will return TIME64_MAX in case of overflow. | |
146 | */ | |
147 | extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, | |
148 | const struct timespec64 rhs); | |
149 | ||
361a3bf0 | 150 | #endif /* _LINUX_TIME64_H */ |