4 # include <linux/cache.h>
5 # include <linux/seqlock.h>
6 # include <linux/math64.h>
7 #include <uapi/linux/time.h>
9 extern struct timezone sys_tz;
11 /* Parameters used to convert the timespec values: */
12 #define MSEC_PER_SEC 1000L
13 #define USEC_PER_MSEC 1000L
14 #define NSEC_PER_USEC 1000L
15 #define NSEC_PER_MSEC 1000000L
16 #define USEC_PER_SEC 1000000L
17 #define NSEC_PER_SEC 1000000000L
18 #define FSEC_PER_SEC 1000000000000000LL
20 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
22 static inline int timespec_equal(const struct timespec *a,
23 const struct timespec *b)
25 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
29 * lhs < rhs: return <0
30 * lhs == rhs: return 0
31 * lhs > rhs: return >0
33 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
35 if (lhs->tv_sec < rhs->tv_sec)
37 if (lhs->tv_sec > rhs->tv_sec)
39 return lhs->tv_nsec - rhs->tv_nsec;
42 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
44 if (lhs->tv_sec < rhs->tv_sec)
46 if (lhs->tv_sec > rhs->tv_sec)
48 return lhs->tv_usec - rhs->tv_usec;
51 extern unsigned long mktime(const unsigned int year, const unsigned int mon,
52 const unsigned int day, const unsigned int hour,
53 const unsigned int min, const unsigned int sec);
55 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
58 * timespec_add_safe assumes both values are positive and checks
59 * for overflow. It will return TIME_T_MAX if the reutrn would be
60 * smaller then either of the arguments.
62 extern struct timespec timespec_add_safe(const struct timespec lhs,
63 const struct timespec rhs);
66 static inline struct timespec timespec_add(struct timespec lhs,
69 struct timespec ts_delta;
70 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
71 lhs.tv_nsec + rhs.tv_nsec);
76 * sub = lhs - rhs, in normalized form
78 static inline struct timespec timespec_sub(struct timespec lhs,
81 struct timespec ts_delta;
82 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
83 lhs.tv_nsec - rhs.tv_nsec);
87 #define KTIME_MAX ((s64)~((u64)1 << 63))
88 #if (BITS_PER_LONG == 64)
89 # define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
91 # define KTIME_SEC_MAX LONG_MAX
95 * Returns true if the timespec is norm, false if denorm:
97 static inline bool timespec_valid(const struct timespec *ts)
99 /* Dates before 1970 are bogus */
102 /* Can't have more nanoseconds then a second */
103 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
108 static inline bool timespec_valid_strict(const struct timespec *ts)
110 if (!timespec_valid(ts))
112 /* Disallow values that could overflow ktime_t */
113 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
118 extern bool persistent_clock_exist;
120 #ifdef ALWAYS_USE_PERSISTENT_CLOCK
121 #define has_persistent_clock() true
123 static inline bool has_persistent_clock(void)
125 return persistent_clock_exist;
129 extern void read_persistent_clock(struct timespec *ts);
130 extern void read_boot_clock(struct timespec *ts);
131 extern int update_persistent_clock(struct timespec now);
132 void timekeeping_init(void);
133 extern int timekeeping_suspended;
135 unsigned long get_seconds(void);
136 struct timespec current_kernel_time(void);
137 struct timespec __current_kernel_time(void); /* does not take xtime_lock */
138 struct timespec get_monotonic_coarse(void);
139 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
140 struct timespec *wtom, struct timespec *sleep);
141 void timekeeping_inject_sleeptime(struct timespec *delta);
143 #define CURRENT_TIME (current_kernel_time())
144 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
146 /* Some architectures do not supply their own clocksource.
147 * This is mainly the case in architectures that get their
148 * inter-tick times by reading the counter on their interval
149 * timer. Since these timers wrap every tick, they're not really
150 * useful as clocksources. Wrapping them to act like one is possible
151 * but not very efficient. So we provide a callout these arches
152 * can implement for use with the jiffies clocksource to provide
153 * finer then tick granular time.
155 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
156 extern u32 arch_gettimeoffset(void);
158 static inline u32 arch_gettimeoffset(void) { return 0; }
161 extern void do_gettimeofday(struct timeval *tv);
162 extern int do_settimeofday(const struct timespec *tv);
163 extern int do_sys_settimeofday(const struct timespec *tv,
164 const struct timezone *tz);
165 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
166 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
168 extern int do_setitimer(int which, struct itimerval *value,
169 struct itimerval *ovalue);
170 extern unsigned int alarm_setitimer(unsigned int seconds);
171 extern int do_getitimer(int which, struct itimerval *value);
172 extern int __getnstimeofday(struct timespec *tv);
173 extern void getnstimeofday(struct timespec *tv);
174 extern void getrawmonotonic(struct timespec *ts);
175 extern void getnstime_raw_and_real(struct timespec *ts_raw,
176 struct timespec *ts_real);
177 extern void getboottime(struct timespec *ts);
178 extern void monotonic_to_bootbased(struct timespec *ts);
179 extern void get_monotonic_boottime(struct timespec *ts);
181 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
182 extern int timekeeping_valid_for_hres(void);
183 extern u64 timekeeping_max_deferment(void);
184 extern int timekeeping_inject_offset(struct timespec *ts);
187 extern void do_sys_times(struct tms *);
190 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
191 * that the kernel source is self contained.
195 * the number of seconds after the minute, normally in the range
196 * 0 to 59, but can be up to 60 to allow for leap seconds
199 /* the number of minutes after the hour, in the range 0 to 59*/
201 /* the number of hours past midnight, in the range 0 to 23 */
203 /* the day of the month, in the range 1 to 31 */
205 /* the number of months since January, in the range 0 to 11 */
207 /* the number of years since 1900 */
209 /* the number of days since Sunday, in the range 0 to 6 */
211 /* the number of days since January 1, in the range 0 to 365 */
215 void time_to_tm(time_t totalsecs, int offset, struct tm *result);
218 * timespec_to_ns - Convert timespec to nanoseconds
219 * @ts: pointer to the timespec variable to be converted
221 * Returns the scalar nanosecond representation of the timespec
224 static inline s64 timespec_to_ns(const struct timespec *ts)
226 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
230 * timeval_to_ns - Convert timeval to nanoseconds
231 * @ts: pointer to the timeval variable to be converted
233 * Returns the scalar nanosecond representation of the timeval
236 static inline s64 timeval_to_ns(const struct timeval *tv)
238 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
239 tv->tv_usec * NSEC_PER_USEC;
243 * ns_to_timespec - Convert nanoseconds to timespec
244 * @nsec: the nanoseconds value to be converted
246 * Returns the timespec representation of the nsec parameter.
248 extern struct timespec ns_to_timespec(const s64 nsec);
251 * ns_to_timeval - Convert nanoseconds to timeval
252 * @nsec: the nanoseconds value to be converted
254 * Returns the timeval representation of the nsec parameter.
256 extern struct timeval ns_to_timeval(const s64 nsec);
259 * timespec_add_ns - Adds nanoseconds to a timespec
260 * @a: pointer to timespec to be incremented
261 * @ns: unsigned nanoseconds value to be added
263 * This must always be inlined because its used from the x86-64 vdso,
264 * which cannot call other kernel functions.
266 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
268 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);