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1da177e4 LT |
1 | #ifndef _LINUX_TIME_H |
2 | #define _LINUX_TIME_H | |
3 | ||
82644459 | 4 | # include <linux/cache.h> |
57a55875 | 5 | # include <linux/seqlock.h> |
f595ec96 | 6 | # include <linux/math64.h> |
361a3bf0 | 7 | # include <linux/time64.h> |
1da177e4 | 8 | |
b418da16 CH |
9 | extern struct timezone sys_tz; |
10 | ||
df0cc053 TG |
11 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
12 | ||
5b78cc9a JE |
13 | static inline int timespec_equal(const struct timespec *a, |
14 | const struct timespec *b) | |
57a55875 | 15 | { |
1da177e4 | 16 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
57a55875 | 17 | } |
1da177e4 | 18 | |
643a6545 AM |
19 | /* |
20 | * lhs < rhs: return <0 | |
21 | * lhs == rhs: return 0 | |
22 | * lhs > rhs: return >0 | |
23 | */ | |
77adbfbf | 24 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
643a6545 AM |
25 | { |
26 | if (lhs->tv_sec < rhs->tv_sec) | |
27 | return -1; | |
28 | if (lhs->tv_sec > rhs->tv_sec) | |
29 | return 1; | |
30 | return lhs->tv_nsec - rhs->tv_nsec; | |
31 | } | |
32 | ||
77adbfbf | 33 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
643a6545 AM |
34 | { |
35 | if (lhs->tv_sec < rhs->tv_sec) | |
36 | return -1; | |
37 | if (lhs->tv_sec > rhs->tv_sec) | |
38 | return 1; | |
39 | return lhs->tv_usec - rhs->tv_usec; | |
40 | } | |
41 | ||
f4818900 IM |
42 | extern unsigned long mktime(const unsigned int year, const unsigned int mon, |
43 | const unsigned int day, const unsigned int hour, | |
44 | const unsigned int min, const unsigned int sec); | |
45 | ||
12e09337 | 46 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); |
ce3bf7ab JS |
47 | |
48 | /* | |
49 | * timespec_add_safe assumes both values are positive and checks | |
50 | * for overflow. It will return TIME_T_MAX if the reutrn would be | |
51 | * smaller then either of the arguments. | |
52 | */ | |
df0cc053 TG |
53 | extern struct timespec timespec_add_safe(const struct timespec lhs, |
54 | const struct timespec rhs); | |
1da177e4 | 55 | |
ce3bf7ab JS |
56 | |
57 | static inline struct timespec timespec_add(struct timespec lhs, | |
58 | struct timespec rhs) | |
59 | { | |
60 | struct timespec ts_delta; | |
61 | set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec, | |
62 | lhs.tv_nsec + rhs.tv_nsec); | |
63 | return ts_delta; | |
64 | } | |
65 | ||
ca74e92b SN |
66 | /* |
67 | * sub = lhs - rhs, in normalized form | |
68 | */ | |
69 | static inline struct timespec timespec_sub(struct timespec lhs, | |
70 | struct timespec rhs) | |
71 | { | |
72 | struct timespec ts_delta; | |
73 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
74 | lhs.tv_nsec - rhs.tv_nsec); | |
75 | return ts_delta; | |
76 | } | |
77 | ||
5f82b2b7 TG |
78 | /* |
79 | * Returns true if the timespec is norm, false if denorm: | |
80 | */ | |
4e8b1452 JS |
81 | static inline bool timespec_valid(const struct timespec *ts) |
82 | { | |
83 | /* Dates before 1970 are bogus */ | |
84 | if (ts->tv_sec < 0) | |
85 | return false; | |
86 | /* Can't have more nanoseconds then a second */ | |
87 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
88 | return false; | |
cee58483 JS |
89 | return true; |
90 | } | |
91 | ||
92 | static inline bool timespec_valid_strict(const struct timespec *ts) | |
93 | { | |
94 | if (!timespec_valid(ts)) | |
95 | return false; | |
4e8b1452 JS |
96 | /* Disallow values that could overflow ktime_t */ |
97 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) | |
98 | return false; | |
99 | return true; | |
100 | } | |
5f82b2b7 | 101 | |
31ade306 | 102 | extern bool persistent_clock_exist; |
05ad717c | 103 | |
31ade306 FT |
104 | static inline bool has_persistent_clock(void) |
105 | { | |
106 | return persistent_clock_exist; | |
107 | } | |
108 | ||
d4f587c6 | 109 | extern void read_persistent_clock(struct timespec *ts); |
23970e38 | 110 | extern void read_boot_clock(struct timespec *ts); |
84e345e4 | 111 | extern int persistent_clock_is_local; |
82644459 | 112 | extern int update_persistent_clock(struct timespec now); |
ad596171 | 113 | void timekeeping_init(void); |
1c5745aa | 114 | extern int timekeeping_suspended; |
ad596171 | 115 | |
17c38b74 | 116 | unsigned long get_seconds(void); |
1da177e4 | 117 | struct timespec current_kernel_time(void); |
8ab4351a | 118 | struct timespec __current_kernel_time(void); /* does not take xtime_lock */ |
da15cfda | 119 | struct timespec get_monotonic_coarse(void); |
304529b1 | 120 | void timekeeping_inject_sleeptime(struct timespec *delta); |
1da177e4 | 121 | |
57a55875 | 122 | #define CURRENT_TIME (current_kernel_time()) |
2c6b47de | 123 | #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) |
1da177e4 | 124 | |
7d27558c JS |
125 | /* Some architectures do not supply their own clocksource. |
126 | * This is mainly the case in architectures that get their | |
127 | * inter-tick times by reading the counter on their interval | |
128 | * timer. Since these timers wrap every tick, they're not really | |
129 | * useful as clocksources. Wrapping them to act like one is possible | |
130 | * but not very efficient. So we provide a callout these arches | |
131 | * can implement for use with the jiffies clocksource to provide | |
132 | * finer then tick granular time. | |
133 | */ | |
134 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
7b1f6207 | 135 | extern u32 (*arch_gettimeoffset)(void); |
7d27558c JS |
136 | #endif |
137 | ||
1da177e4 | 138 | extern void do_gettimeofday(struct timeval *tv); |
1e6d7679 RC |
139 | extern int do_settimeofday(const struct timespec *tv); |
140 | extern int do_sys_settimeofday(const struct timespec *tv, | |
141 | const struct timezone *tz); | |
becf8b5d | 142 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
c7887325 | 143 | extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); |
1da177e4 | 144 | struct itimerval; |
57a55875 IM |
145 | extern int do_setitimer(int which, struct itimerval *value, |
146 | struct itimerval *ovalue); | |
c08b8a49 | 147 | extern unsigned int alarm_setitimer(unsigned int seconds); |
1da177e4 | 148 | extern int do_getitimer(int which, struct itimerval *value); |
1e817fb6 | 149 | extern int __getnstimeofday(struct timespec *tv); |
57a55875 | 150 | extern void getnstimeofday(struct timespec *tv); |
2d42244a | 151 | extern void getrawmonotonic(struct timespec *ts); |
e2c18e49 AG |
152 | extern void getnstime_raw_and_real(struct timespec *ts_raw, |
153 | struct timespec *ts_real); | |
7c3f1a57 TJ |
154 | extern void getboottime(struct timespec *ts); |
155 | extern void monotonic_to_bootbased(struct timespec *ts); | |
abb3a4ea | 156 | extern void get_monotonic_boottime(struct timespec *ts); |
1da177e4 LT |
157 | |
158 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); | |
cf4fc6cb | 159 | extern int timekeeping_valid_for_hres(void); |
98962465 | 160 | extern u64 timekeeping_max_deferment(void); |
c528f7c6 | 161 | extern int timekeeping_inject_offset(struct timespec *ts); |
cc244dda JS |
162 | extern s32 timekeeping_get_tai_offset(void); |
163 | extern void timekeeping_set_tai_offset(s32 tai_offset); | |
1ff3c967 | 164 | extern void timekeeping_clocktai(struct timespec *ts); |
1da177e4 | 165 | |
f06febc9 FM |
166 | struct tms; |
167 | extern void do_sys_times(struct tms *); | |
168 | ||
57f1f087 Z |
169 | /* |
170 | * Similar to the struct tm in userspace <time.h>, but it needs to be here so | |
171 | * that the kernel source is self contained. | |
172 | */ | |
173 | struct tm { | |
174 | /* | |
175 | * the number of seconds after the minute, normally in the range | |
176 | * 0 to 59, but can be up to 60 to allow for leap seconds | |
177 | */ | |
178 | int tm_sec; | |
179 | /* the number of minutes after the hour, in the range 0 to 59*/ | |
180 | int tm_min; | |
181 | /* the number of hours past midnight, in the range 0 to 23 */ | |
182 | int tm_hour; | |
183 | /* the day of the month, in the range 1 to 31 */ | |
184 | int tm_mday; | |
185 | /* the number of months since January, in the range 0 to 11 */ | |
186 | int tm_mon; | |
187 | /* the number of years since 1900 */ | |
188 | long tm_year; | |
189 | /* the number of days since Sunday, in the range 0 to 6 */ | |
190 | int tm_wday; | |
191 | /* the number of days since January 1, in the range 0 to 365 */ | |
192 | int tm_yday; | |
193 | }; | |
194 | ||
195 | void time_to_tm(time_t totalsecs, int offset, struct tm *result); | |
196 | ||
f8f46da3 TG |
197 | /** |
198 | * timespec_to_ns - Convert timespec to nanoseconds | |
199 | * @ts: pointer to the timespec variable to be converted | |
200 | * | |
201 | * Returns the scalar nanosecond representation of the timespec | |
202 | * parameter. | |
203 | */ | |
df869b63 | 204 | static inline s64 timespec_to_ns(const struct timespec *ts) |
f8f46da3 | 205 | { |
df869b63 | 206 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
f8f46da3 TG |
207 | } |
208 | ||
209 | /** | |
210 | * timeval_to_ns - Convert timeval to nanoseconds | |
211 | * @ts: pointer to the timeval variable to be converted | |
212 | * | |
213 | * Returns the scalar nanosecond representation of the timeval | |
214 | * parameter. | |
215 | */ | |
df869b63 | 216 | static inline s64 timeval_to_ns(const struct timeval *tv) |
f8f46da3 | 217 | { |
df869b63 | 218 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
f8f46da3 TG |
219 | tv->tv_usec * NSEC_PER_USEC; |
220 | } | |
221 | ||
222 | /** | |
223 | * ns_to_timespec - Convert nanoseconds to timespec | |
224 | * @nsec: the nanoseconds value to be converted | |
225 | * | |
226 | * Returns the timespec representation of the nsec parameter. | |
227 | */ | |
df869b63 | 228 | extern struct timespec ns_to_timespec(const s64 nsec); |
f8f46da3 TG |
229 | |
230 | /** | |
231 | * ns_to_timeval - Convert nanoseconds to timeval | |
232 | * @nsec: the nanoseconds value to be converted | |
233 | * | |
234 | * Returns the timeval representation of the nsec parameter. | |
235 | */ | |
df869b63 | 236 | extern struct timeval ns_to_timeval(const s64 nsec); |
f8f46da3 | 237 | |
cf3c769b JS |
238 | /** |
239 | * timespec_add_ns - Adds nanoseconds to a timespec | |
240 | * @a: pointer to timespec to be incremented | |
241 | * @ns: unsigned nanoseconds value to be added | |
9412e286 JF |
242 | * |
243 | * This must always be inlined because its used from the x86-64 vdso, | |
244 | * which cannot call other kernel functions. | |
cf3c769b | 245 | */ |
9412e286 | 246 | static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) |
cf3c769b | 247 | { |
9412e286 | 248 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); |
cf3c769b JS |
249 | a->tv_nsec = ns; |
250 | } | |
8b3d1cda | 251 | |
1da177e4 | 252 | #endif |