Commit | Line | Data |
---|---|---|
361a3bf0 JS |
1 | #ifndef _LINUX_TIME64_H |
2 | #define _LINUX_TIME64_H | |
3 | ||
4 | #include <uapi/linux/time.h> | |
30f3b3f9 | 5 | #include <linux/math64.h> |
361a3bf0 JS |
6 | |
7 | typedef __s64 time64_t; | |
8 | ||
9 | /* | |
10 | * This wants to go into uapi/linux/time.h once we agreed about the | |
11 | * userspace interfaces. | |
12 | */ | |
13 | #if __BITS_PER_LONG == 64 | |
14 | # define timespec64 timespec | |
15 | #else | |
16 | struct timespec64 { | |
17 | time64_t tv_sec; /* seconds */ | |
18 | long tv_nsec; /* nanoseconds */ | |
19 | }; | |
20 | #endif | |
21 | ||
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 | |
30 | ||
31 | /* Located here for timespec[64]_valid_strict */ | |
833f32d7 | 32 | #define TIME64_MAX ((s64)~((u64)1 << 63)) |
361a3bf0 JS |
33 | #define KTIME_MAX ((s64)~((u64)1 << 63)) |
34 | #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) | |
35 | ||
36 | #if __BITS_PER_LONG == 64 | |
37 | ||
49cd6f86 JS |
38 | static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) |
39 | { | |
40 | return ts64; | |
41 | } | |
42 | ||
43 | static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) | |
44 | { | |
45 | return ts; | |
46 | } | |
47 | ||
361a3bf0 JS |
48 | # define timespec64_equal timespec_equal |
49 | # define timespec64_compare timespec_compare | |
50 | # define set_normalized_timespec64 set_normalized_timespec | |
51 | # define timespec64_add_safe timespec_add_safe | |
52 | # define timespec64_add timespec_add | |
53 | # define timespec64_sub timespec_sub | |
54 | # define timespec64_valid timespec_valid | |
55 | # define timespec64_valid_strict timespec_valid_strict | |
56 | # define timespec64_to_ns timespec_to_ns | |
57 | # define ns_to_timespec64 ns_to_timespec | |
58 | # define timespec64_add_ns timespec_add_ns | |
59 | ||
60 | #else | |
61 | ||
49cd6f86 JS |
62 | static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) |
63 | { | |
64 | struct timespec ret; | |
65 | ||
66 | ret.tv_sec = (time_t)ts64.tv_sec; | |
67 | ret.tv_nsec = ts64.tv_nsec; | |
68 | return ret; | |
69 | } | |
70 | ||
71 | static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) | |
72 | { | |
73 | struct timespec64 ret; | |
74 | ||
75 | ret.tv_sec = ts.tv_sec; | |
76 | ret.tv_nsec = ts.tv_nsec; | |
77 | return ret; | |
78 | } | |
79 | ||
361a3bf0 JS |
80 | static inline int timespec64_equal(const struct timespec64 *a, |
81 | const struct timespec64 *b) | |
82 | { | |
83 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); | |
84 | } | |
85 | ||
86 | /* | |
87 | * lhs < rhs: return <0 | |
88 | * lhs == rhs: return 0 | |
89 | * lhs > rhs: return >0 | |
90 | */ | |
91 | static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) | |
92 | { | |
93 | if (lhs->tv_sec < rhs->tv_sec) | |
94 | return -1; | |
95 | if (lhs->tv_sec > rhs->tv_sec) | |
96 | return 1; | |
97 | return lhs->tv_nsec - rhs->tv_nsec; | |
98 | } | |
99 | ||
100 | extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); | |
101 | ||
102 | /* | |
103 | * timespec64_add_safe assumes both values are positive and checks for | |
104 | * overflow. It will return TIME_T_MAX if the returned value would be | |
105 | * smaller then either of the arguments. | |
106 | */ | |
107 | extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, | |
108 | const struct timespec64 rhs); | |
109 | ||
110 | ||
111 | static inline struct timespec64 timespec64_add(struct timespec64 lhs, | |
112 | struct timespec64 rhs) | |
113 | { | |
114 | struct timespec64 ts_delta; | |
115 | set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, | |
116 | lhs.tv_nsec + rhs.tv_nsec); | |
117 | return ts_delta; | |
118 | } | |
119 | ||
120 | /* | |
121 | * sub = lhs - rhs, in normalized form | |
122 | */ | |
123 | static inline struct timespec64 timespec64_sub(struct timespec64 lhs, | |
124 | struct timespec64 rhs) | |
125 | { | |
126 | struct timespec64 ts_delta; | |
127 | set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
128 | lhs.tv_nsec - rhs.tv_nsec); | |
129 | return ts_delta; | |
130 | } | |
131 | ||
132 | /* | |
133 | * Returns true if the timespec64 is norm, false if denorm: | |
134 | */ | |
135 | static inline bool timespec64_valid(const struct timespec64 *ts) | |
136 | { | |
137 | /* Dates before 1970 are bogus */ | |
138 | if (ts->tv_sec < 0) | |
139 | return false; | |
140 | /* Can't have more nanoseconds then a second */ | |
141 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
142 | return false; | |
143 | return true; | |
144 | } | |
145 | ||
146 | static inline bool timespec64_valid_strict(const struct timespec64 *ts) | |
147 | { | |
148 | if (!timespec64_valid(ts)) | |
149 | return false; | |
150 | /* Disallow values that could overflow ktime_t */ | |
151 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) | |
152 | return false; | |
153 | return true; | |
154 | } | |
155 | ||
156 | /** | |
157 | * timespec64_to_ns - Convert timespec64 to nanoseconds | |
158 | * @ts: pointer to the timespec64 variable to be converted | |
159 | * | |
160 | * Returns the scalar nanosecond representation of the timespec64 | |
161 | * parameter. | |
162 | */ | |
163 | static inline s64 timespec64_to_ns(const struct timespec64 *ts) | |
164 | { | |
165 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; | |
166 | } | |
167 | ||
168 | /** | |
169 | * ns_to_timespec64 - Convert nanoseconds to timespec64 | |
170 | * @nsec: the nanoseconds value to be converted | |
171 | * | |
172 | * Returns the timespec64 representation of the nsec parameter. | |
173 | */ | |
174 | extern struct timespec64 ns_to_timespec64(const s64 nsec); | |
175 | ||
176 | /** | |
177 | * timespec64_add_ns - Adds nanoseconds to a timespec64 | |
178 | * @a: pointer to timespec64 to be incremented | |
179 | * @ns: unsigned nanoseconds value to be added | |
180 | * | |
181 | * This must always be inlined because its used from the x86-64 vdso, | |
182 | * which cannot call other kernel functions. | |
183 | */ | |
184 | static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) | |
185 | { | |
186 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); | |
187 | a->tv_nsec = ns; | |
188 | } | |
189 | ||
190 | #endif | |
191 | ||
192 | #endif /* _LINUX_TIME64_H */ |