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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 | |
19a46fe5 | 15 | #define itimerspec64 itimerspec |
361a3bf0 JS |
16 | #else |
17 | struct timespec64 { | |
18 | time64_t tv_sec; /* seconds */ | |
19 | long tv_nsec; /* nanoseconds */ | |
20 | }; | |
19a46fe5 BW |
21 | |
22 | struct itimerspec64 { | |
23 | struct timespec64 it_interval; | |
24 | struct timespec64 it_value; | |
25 | }; | |
26 | ||
361a3bf0 JS |
27 | #endif |
28 | ||
29 | /* Parameters used to convert the timespec values: */ | |
30 | #define MSEC_PER_SEC 1000L | |
31 | #define USEC_PER_MSEC 1000L | |
32 | #define NSEC_PER_USEC 1000L | |
33 | #define NSEC_PER_MSEC 1000000L | |
34 | #define USEC_PER_SEC 1000000L | |
35 | #define NSEC_PER_SEC 1000000000L | |
36 | #define FSEC_PER_SEC 1000000000000000LL | |
37 | ||
38 | /* Located here for timespec[64]_valid_strict */ | |
833f32d7 | 39 | #define TIME64_MAX ((s64)~((u64)1 << 63)) |
361a3bf0 JS |
40 | #define KTIME_MAX ((s64)~((u64)1 << 63)) |
41 | #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) | |
42 | ||
43 | #if __BITS_PER_LONG == 64 | |
44 | ||
49cd6f86 JS |
45 | static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) |
46 | { | |
47 | return ts64; | |
48 | } | |
49 | ||
50 | static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) | |
51 | { | |
52 | return ts; | |
53 | } | |
54 | ||
19a46fe5 BW |
55 | static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) |
56 | { | |
57 | return *its64; | |
58 | } | |
59 | ||
60 | static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) | |
61 | { | |
62 | return *its; | |
63 | } | |
64 | ||
361a3bf0 JS |
65 | # define timespec64_equal timespec_equal |
66 | # define timespec64_compare timespec_compare | |
67 | # define set_normalized_timespec64 set_normalized_timespec | |
68 | # define timespec64_add_safe timespec_add_safe | |
69 | # define timespec64_add timespec_add | |
70 | # define timespec64_sub timespec_sub | |
71 | # define timespec64_valid timespec_valid | |
72 | # define timespec64_valid_strict timespec_valid_strict | |
73 | # define timespec64_to_ns timespec_to_ns | |
74 | # define ns_to_timespec64 ns_to_timespec | |
75 | # define timespec64_add_ns timespec_add_ns | |
76 | ||
77 | #else | |
78 | ||
49cd6f86 JS |
79 | static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) |
80 | { | |
81 | struct timespec ret; | |
82 | ||
83 | ret.tv_sec = (time_t)ts64.tv_sec; | |
84 | ret.tv_nsec = ts64.tv_nsec; | |
85 | return ret; | |
86 | } | |
87 | ||
88 | static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) | |
89 | { | |
90 | struct timespec64 ret; | |
91 | ||
92 | ret.tv_sec = ts.tv_sec; | |
93 | ret.tv_nsec = ts.tv_nsec; | |
94 | return ret; | |
95 | } | |
96 | ||
19a46fe5 BW |
97 | static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) |
98 | { | |
99 | struct itimerspec ret; | |
100 | ||
101 | ret.it_interval = timespec64_to_timespec(its64->it_interval); | |
102 | ret.it_value = timespec64_to_timespec(its64->it_value); | |
103 | return ret; | |
104 | } | |
105 | ||
106 | static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) | |
107 | { | |
108 | struct itimerspec64 ret; | |
109 | ||
110 | ret.it_interval = timespec_to_timespec64(its->it_interval); | |
111 | ret.it_value = timespec_to_timespec64(its->it_value); | |
112 | return ret; | |
113 | } | |
114 | ||
361a3bf0 JS |
115 | static inline int timespec64_equal(const struct timespec64 *a, |
116 | const struct timespec64 *b) | |
117 | { | |
118 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); | |
119 | } | |
120 | ||
121 | /* | |
122 | * lhs < rhs: return <0 | |
123 | * lhs == rhs: return 0 | |
124 | * lhs > rhs: return >0 | |
125 | */ | |
126 | static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) | |
127 | { | |
128 | if (lhs->tv_sec < rhs->tv_sec) | |
129 | return -1; | |
130 | if (lhs->tv_sec > rhs->tv_sec) | |
131 | return 1; | |
132 | return lhs->tv_nsec - rhs->tv_nsec; | |
133 | } | |
134 | ||
135 | extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); | |
136 | ||
137 | /* | |
138 | * timespec64_add_safe assumes both values are positive and checks for | |
139 | * overflow. It will return TIME_T_MAX if the returned value would be | |
140 | * smaller then either of the arguments. | |
141 | */ | |
142 | extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, | |
143 | const struct timespec64 rhs); | |
144 | ||
145 | ||
146 | static inline struct timespec64 timespec64_add(struct timespec64 lhs, | |
147 | struct timespec64 rhs) | |
148 | { | |
149 | struct timespec64 ts_delta; | |
150 | set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, | |
151 | lhs.tv_nsec + rhs.tv_nsec); | |
152 | return ts_delta; | |
153 | } | |
154 | ||
155 | /* | |
156 | * sub = lhs - rhs, in normalized form | |
157 | */ | |
158 | static inline struct timespec64 timespec64_sub(struct timespec64 lhs, | |
159 | struct timespec64 rhs) | |
160 | { | |
161 | struct timespec64 ts_delta; | |
162 | set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
163 | lhs.tv_nsec - rhs.tv_nsec); | |
164 | return ts_delta; | |
165 | } | |
166 | ||
167 | /* | |
168 | * Returns true if the timespec64 is norm, false if denorm: | |
169 | */ | |
170 | static inline bool timespec64_valid(const struct timespec64 *ts) | |
171 | { | |
172 | /* Dates before 1970 are bogus */ | |
173 | if (ts->tv_sec < 0) | |
174 | return false; | |
175 | /* Can't have more nanoseconds then a second */ | |
176 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
177 | return false; | |
178 | return true; | |
179 | } | |
180 | ||
181 | static inline bool timespec64_valid_strict(const struct timespec64 *ts) | |
182 | { | |
183 | if (!timespec64_valid(ts)) | |
184 | return false; | |
185 | /* Disallow values that could overflow ktime_t */ | |
186 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) | |
187 | return false; | |
188 | return true; | |
189 | } | |
190 | ||
191 | /** | |
192 | * timespec64_to_ns - Convert timespec64 to nanoseconds | |
193 | * @ts: pointer to the timespec64 variable to be converted | |
194 | * | |
195 | * Returns the scalar nanosecond representation of the timespec64 | |
196 | * parameter. | |
197 | */ | |
198 | static inline s64 timespec64_to_ns(const struct timespec64 *ts) | |
199 | { | |
200 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; | |
201 | } | |
202 | ||
203 | /** | |
204 | * ns_to_timespec64 - Convert nanoseconds to timespec64 | |
205 | * @nsec: the nanoseconds value to be converted | |
206 | * | |
207 | * Returns the timespec64 representation of the nsec parameter. | |
208 | */ | |
209 | extern struct timespec64 ns_to_timespec64(const s64 nsec); | |
210 | ||
211 | /** | |
212 | * timespec64_add_ns - Adds nanoseconds to a timespec64 | |
213 | * @a: pointer to timespec64 to be incremented | |
214 | * @ns: unsigned nanoseconds value to be added | |
215 | * | |
216 | * This must always be inlined because its used from the x86-64 vdso, | |
217 | * which cannot call other kernel functions. | |
218 | */ | |
219 | static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) | |
220 | { | |
221 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); | |
222 | a->tv_nsec = ns; | |
223 | } | |
224 | ||
225 | #endif | |
226 | ||
227 | #endif /* _LINUX_TIME64_H */ |