4 # include <linux/cache.h>
5 # include <linux/seqlock.h>
6 # include <linux/math64.h>
7 # include <linux/time64.h>
9 extern struct timezone sys_tz;
11 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
13 static inline int timespec_equal(const struct timespec *a,
14 const struct timespec *b)
16 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
20 * lhs < rhs: return <0
21 * lhs == rhs: return 0
22 * lhs > rhs: return >0
24 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
26 if (lhs->tv_sec < rhs->tv_sec)
28 if (lhs->tv_sec > rhs->tv_sec)
30 return lhs->tv_nsec - rhs->tv_nsec;
33 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
35 if (lhs->tv_sec < rhs->tv_sec)
37 if (lhs->tv_sec > rhs->tv_sec)
39 return lhs->tv_usec - rhs->tv_usec;
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);
46 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
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.
53 extern struct timespec timespec_add_safe(const struct timespec lhs,
54 const struct timespec rhs);
57 static inline struct timespec timespec_add(struct timespec lhs,
60 struct timespec ts_delta;
61 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
62 lhs.tv_nsec + rhs.tv_nsec);
67 * sub = lhs - rhs, in normalized form
69 static inline struct timespec timespec_sub(struct timespec lhs,
72 struct timespec ts_delta;
73 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
74 lhs.tv_nsec - rhs.tv_nsec);
79 * Returns true if the timespec is norm, false if denorm:
81 static inline bool timespec_valid(const struct timespec *ts)
83 /* Dates before 1970 are bogus */
86 /* Can't have more nanoseconds then a second */
87 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
92 static inline bool timespec_valid_strict(const struct timespec *ts)
94 if (!timespec_valid(ts))
96 /* Disallow values that could overflow ktime_t */
97 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
102 extern bool persistent_clock_exist;
104 static inline bool has_persistent_clock(void)
106 return persistent_clock_exist;
109 extern void read_persistent_clock(struct timespec *ts);
110 extern void read_boot_clock(struct timespec *ts);
111 extern int persistent_clock_is_local;
112 extern int update_persistent_clock(struct timespec now);
113 void timekeeping_init(void);
114 extern int timekeeping_suspended;
116 unsigned long get_seconds(void);
117 struct timespec current_kernel_time(void);
118 struct timespec __current_kernel_time(void); /* does not take xtime_lock */
119 struct timespec get_monotonic_coarse(void);
120 void timekeeping_inject_sleeptime(struct timespec *delta);
122 #define CURRENT_TIME (current_kernel_time())
123 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
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.
134 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
135 extern u32 (*arch_gettimeoffset)(void);
138 extern void do_gettimeofday(struct timeval *tv);
139 extern int do_settimeofday(const struct timespec *tv);
140 extern int do_sys_settimeofday(const struct timespec *tv,
141 const struct timezone *tz);
142 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
143 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
145 extern int do_setitimer(int which, struct itimerval *value,
146 struct itimerval *ovalue);
147 extern unsigned int alarm_setitimer(unsigned int seconds);
148 extern int do_getitimer(int which, struct itimerval *value);
149 extern int __getnstimeofday(struct timespec *tv);
150 extern void getnstimeofday(struct timespec *tv);
151 extern void getrawmonotonic(struct timespec *ts);
152 extern void getnstime_raw_and_real(struct timespec *ts_raw,
153 struct timespec *ts_real);
154 extern void getboottime(struct timespec *ts);
155 extern void monotonic_to_bootbased(struct timespec *ts);
156 extern void get_monotonic_boottime(struct timespec *ts);
158 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
159 extern int timekeeping_valid_for_hres(void);
160 extern u64 timekeeping_max_deferment(void);
161 extern int timekeeping_inject_offset(struct timespec *ts);
162 extern s32 timekeeping_get_tai_offset(void);
163 extern void timekeeping_set_tai_offset(s32 tai_offset);
164 extern void timekeeping_clocktai(struct timespec *ts);
167 extern void do_sys_times(struct tms *);
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.
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
179 /* the number of minutes after the hour, in the range 0 to 59*/
181 /* the number of hours past midnight, in the range 0 to 23 */
183 /* the day of the month, in the range 1 to 31 */
185 /* the number of months since January, in the range 0 to 11 */
187 /* the number of years since 1900 */
189 /* the number of days since Sunday, in the range 0 to 6 */
191 /* the number of days since January 1, in the range 0 to 365 */
195 void time_to_tm(time_t totalsecs, int offset, struct tm *result);
198 * timespec_to_ns - Convert timespec to nanoseconds
199 * @ts: pointer to the timespec variable to be converted
201 * Returns the scalar nanosecond representation of the timespec
204 static inline s64 timespec_to_ns(const struct timespec *ts)
206 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
210 * timeval_to_ns - Convert timeval to nanoseconds
211 * @ts: pointer to the timeval variable to be converted
213 * Returns the scalar nanosecond representation of the timeval
216 static inline s64 timeval_to_ns(const struct timeval *tv)
218 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
219 tv->tv_usec * NSEC_PER_USEC;
223 * ns_to_timespec - Convert nanoseconds to timespec
224 * @nsec: the nanoseconds value to be converted
226 * Returns the timespec representation of the nsec parameter.
228 extern struct timespec ns_to_timespec(const s64 nsec);
231 * ns_to_timeval - Convert nanoseconds to timeval
232 * @nsec: the nanoseconds value to be converted
234 * Returns the timeval representation of the nsec parameter.
236 extern struct timeval ns_to_timeval(const s64 nsec);
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
243 * This must always be inlined because its used from the x86-64 vdso,
244 * which cannot call other kernel functions.
246 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
248 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);