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361a3bf0 JS |
1 | #ifndef _LINUX_TIME64_H |
2 | #define _LINUX_TIME64_H | |
3 | ||
4 | #include <uapi/linux/time.h> | |
5 | ||
6 | typedef __s64 time64_t; | |
7 | ||
8 | /* | |
9 | * This wants to go into uapi/linux/time.h once we agreed about the | |
10 | * userspace interfaces. | |
11 | */ | |
12 | #if __BITS_PER_LONG == 64 | |
13 | # define timespec64 timespec | |
14 | #else | |
15 | struct timespec64 { | |
16 | time64_t tv_sec; /* seconds */ | |
17 | long tv_nsec; /* nanoseconds */ | |
18 | }; | |
19 | #endif | |
20 | ||
21 | /* Parameters used to convert the timespec values: */ | |
22 | #define MSEC_PER_SEC 1000L | |
23 | #define USEC_PER_MSEC 1000L | |
24 | #define NSEC_PER_USEC 1000L | |
25 | #define NSEC_PER_MSEC 1000000L | |
26 | #define USEC_PER_SEC 1000000L | |
27 | #define NSEC_PER_SEC 1000000000L | |
28 | #define FSEC_PER_SEC 1000000000000000LL | |
29 | ||
30 | /* Located here for timespec[64]_valid_strict */ | |
31 | #define KTIME_MAX ((s64)~((u64)1 << 63)) | |
32 | #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) | |
33 | ||
34 | #if __BITS_PER_LONG == 64 | |
35 | ||
49cd6f86 JS |
36 | static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) |
37 | { | |
38 | return ts64; | |
39 | } | |
40 | ||
41 | static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) | |
42 | { | |
43 | return ts; | |
44 | } | |
45 | ||
361a3bf0 JS |
46 | # define timespec64_equal timespec_equal |
47 | # define timespec64_compare timespec_compare | |
48 | # define set_normalized_timespec64 set_normalized_timespec | |
49 | # define timespec64_add_safe timespec_add_safe | |
50 | # define timespec64_add timespec_add | |
51 | # define timespec64_sub timespec_sub | |
52 | # define timespec64_valid timespec_valid | |
53 | # define timespec64_valid_strict timespec_valid_strict | |
54 | # define timespec64_to_ns timespec_to_ns | |
55 | # define ns_to_timespec64 ns_to_timespec | |
56 | # define timespec64_add_ns timespec_add_ns | |
57 | ||
58 | #else | |
59 | ||
49cd6f86 JS |
60 | static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) |
61 | { | |
62 | struct timespec ret; | |
63 | ||
64 | ret.tv_sec = (time_t)ts64.tv_sec; | |
65 | ret.tv_nsec = ts64.tv_nsec; | |
66 | return ret; | |
67 | } | |
68 | ||
69 | static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) | |
70 | { | |
71 | struct timespec64 ret; | |
72 | ||
73 | ret.tv_sec = ts.tv_sec; | |
74 | ret.tv_nsec = ts.tv_nsec; | |
75 | return ret; | |
76 | } | |
77 | ||
361a3bf0 JS |
78 | static inline int timespec64_equal(const struct timespec64 *a, |
79 | const struct timespec64 *b) | |
80 | { | |
81 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); | |
82 | } | |
83 | ||
84 | /* | |
85 | * lhs < rhs: return <0 | |
86 | * lhs == rhs: return 0 | |
87 | * lhs > rhs: return >0 | |
88 | */ | |
89 | static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) | |
90 | { | |
91 | if (lhs->tv_sec < rhs->tv_sec) | |
92 | return -1; | |
93 | if (lhs->tv_sec > rhs->tv_sec) | |
94 | return 1; | |
95 | return lhs->tv_nsec - rhs->tv_nsec; | |
96 | } | |
97 | ||
98 | extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); | |
99 | ||
100 | /* | |
101 | * timespec64_add_safe assumes both values are positive and checks for | |
102 | * overflow. It will return TIME_T_MAX if the returned value would be | |
103 | * smaller then either of the arguments. | |
104 | */ | |
105 | extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, | |
106 | const struct timespec64 rhs); | |
107 | ||
108 | ||
109 | static inline struct timespec64 timespec64_add(struct timespec64 lhs, | |
110 | struct timespec64 rhs) | |
111 | { | |
112 | struct timespec64 ts_delta; | |
113 | set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, | |
114 | lhs.tv_nsec + rhs.tv_nsec); | |
115 | return ts_delta; | |
116 | } | |
117 | ||
118 | /* | |
119 | * sub = lhs - rhs, in normalized form | |
120 | */ | |
121 | static inline struct timespec64 timespec64_sub(struct timespec64 lhs, | |
122 | struct timespec64 rhs) | |
123 | { | |
124 | struct timespec64 ts_delta; | |
125 | set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
126 | lhs.tv_nsec - rhs.tv_nsec); | |
127 | return ts_delta; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Returns true if the timespec64 is norm, false if denorm: | |
132 | */ | |
133 | static inline bool timespec64_valid(const struct timespec64 *ts) | |
134 | { | |
135 | /* Dates before 1970 are bogus */ | |
136 | if (ts->tv_sec < 0) | |
137 | return false; | |
138 | /* Can't have more nanoseconds then a second */ | |
139 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
140 | return false; | |
141 | return true; | |
142 | } | |
143 | ||
144 | static inline bool timespec64_valid_strict(const struct timespec64 *ts) | |
145 | { | |
146 | if (!timespec64_valid(ts)) | |
147 | return false; | |
148 | /* Disallow values that could overflow ktime_t */ | |
149 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) | |
150 | return false; | |
151 | return true; | |
152 | } | |
153 | ||
154 | /** | |
155 | * timespec64_to_ns - Convert timespec64 to nanoseconds | |
156 | * @ts: pointer to the timespec64 variable to be converted | |
157 | * | |
158 | * Returns the scalar nanosecond representation of the timespec64 | |
159 | * parameter. | |
160 | */ | |
161 | static inline s64 timespec64_to_ns(const struct timespec64 *ts) | |
162 | { | |
163 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; | |
164 | } | |
165 | ||
166 | /** | |
167 | * ns_to_timespec64 - Convert nanoseconds to timespec64 | |
168 | * @nsec: the nanoseconds value to be converted | |
169 | * | |
170 | * Returns the timespec64 representation of the nsec parameter. | |
171 | */ | |
172 | extern struct timespec64 ns_to_timespec64(const s64 nsec); | |
173 | ||
174 | /** | |
175 | * timespec64_add_ns - Adds nanoseconds to a timespec64 | |
176 | * @a: pointer to timespec64 to be incremented | |
177 | * @ns: unsigned nanoseconds value to be added | |
178 | * | |
179 | * This must always be inlined because its used from the x86-64 vdso, | |
180 | * which cannot call other kernel functions. | |
181 | */ | |
182 | static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) | |
183 | { | |
184 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); | |
185 | a->tv_nsec = ns; | |
186 | } | |
187 | ||
188 | #endif | |
189 | ||
190 | #endif /* _LINUX_TIME64_H */ |