4 #include <linux/types.h>
7 # include <linux/cache.h>
8 # include <linux/seqlock.h>
9 # include <linux/math64.h>
12 #ifndef _STRUCT_TIMESPEC
13 #define _STRUCT_TIMESPEC
15 __kernel_time_t tv_sec; /* seconds */
16 long tv_nsec; /* nanoseconds */
21 __kernel_time_t tv_sec; /* seconds */
22 __kernel_suseconds_t tv_usec; /* microseconds */
26 int tz_minuteswest; /* minutes west of Greenwich */
27 int tz_dsttime; /* type of dst correction */
32 extern struct timezone sys_tz;
34 /* Parameters used to convert the timespec values: */
35 #define MSEC_PER_SEC 1000L
36 #define USEC_PER_MSEC 1000L
37 #define NSEC_PER_USEC 1000L
38 #define NSEC_PER_MSEC 1000000L
39 #define USEC_PER_SEC 1000000L
40 #define NSEC_PER_SEC 1000000000L
41 #define FSEC_PER_SEC 1000000000000000LL
43 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
45 static inline int timespec_equal(const struct timespec *a,
46 const struct timespec *b)
48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
56 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
58 if (lhs->tv_sec < rhs->tv_sec)
60 if (lhs->tv_sec > rhs->tv_sec)
62 return lhs->tv_nsec - rhs->tv_nsec;
65 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
67 if (lhs->tv_sec < rhs->tv_sec)
69 if (lhs->tv_sec > rhs->tv_sec)
71 return lhs->tv_usec - rhs->tv_usec;
74 extern unsigned long mktime(const unsigned int year, const unsigned int mon,
75 const unsigned int day, const unsigned int hour,
76 const unsigned int min, const unsigned int sec);
78 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
81 * timespec_add_safe assumes both values are positive and checks
82 * for overflow. It will return TIME_T_MAX if the reutrn would be
83 * smaller then either of the arguments.
85 extern struct timespec timespec_add_safe(const struct timespec lhs,
86 const struct timespec rhs);
89 static inline struct timespec timespec_add(struct timespec lhs,
92 struct timespec ts_delta;
93 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
94 lhs.tv_nsec + rhs.tv_nsec);
99 * sub = lhs - rhs, in normalized form
101 static inline struct timespec timespec_sub(struct timespec lhs,
104 struct timespec ts_delta;
105 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
106 lhs.tv_nsec - rhs.tv_nsec);
110 #define KTIME_MAX ((s64)~((u64)1 << 63))
111 #if (BITS_PER_LONG == 64)
112 # define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
114 # define KTIME_SEC_MAX LONG_MAX
118 * Returns true if the timespec is norm, false if denorm:
120 static inline bool timespec_valid(const struct timespec *ts)
122 /* Dates before 1970 are bogus */
125 /* Can't have more nanoseconds then a second */
126 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
128 /* Disallow values that could overflow ktime_t */
129 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
134 extern void read_persistent_clock(struct timespec *ts);
135 extern void read_boot_clock(struct timespec *ts);
136 extern int update_persistent_clock(struct timespec now);
137 void timekeeping_init(void);
138 extern int timekeeping_suspended;
140 unsigned long get_seconds(void);
141 struct timespec current_kernel_time(void);
142 struct timespec __current_kernel_time(void); /* does not take xtime_lock */
143 struct timespec get_monotonic_coarse(void);
144 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
145 struct timespec *wtom, struct timespec *sleep);
146 void timekeeping_inject_sleeptime(struct timespec *delta);
148 #define CURRENT_TIME (current_kernel_time())
149 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
151 /* Some architectures do not supply their own clocksource.
152 * This is mainly the case in architectures that get their
153 * inter-tick times by reading the counter on their interval
154 * timer. Since these timers wrap every tick, they're not really
155 * useful as clocksources. Wrapping them to act like one is possible
156 * but not very efficient. So we provide a callout these arches
157 * can implement for use with the jiffies clocksource to provide
158 * finer then tick granular time.
160 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
161 extern u32 arch_gettimeoffset(void);
163 static inline u32 arch_gettimeoffset(void) { return 0; }
166 extern void do_gettimeofday(struct timeval *tv);
167 extern int do_settimeofday(const struct timespec *tv);
168 extern int do_sys_settimeofday(const struct timespec *tv,
169 const struct timezone *tz);
170 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
171 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
173 extern int do_setitimer(int which, struct itimerval *value,
174 struct itimerval *ovalue);
175 extern unsigned int alarm_setitimer(unsigned int seconds);
176 extern int do_getitimer(int which, struct itimerval *value);
177 extern void getnstimeofday(struct timespec *tv);
178 extern void getrawmonotonic(struct timespec *ts);
179 extern void getnstime_raw_and_real(struct timespec *ts_raw,
180 struct timespec *ts_real);
181 extern void getboottime(struct timespec *ts);
182 extern void monotonic_to_bootbased(struct timespec *ts);
183 extern void get_monotonic_boottime(struct timespec *ts);
185 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
186 extern int timekeeping_valid_for_hres(void);
187 extern u64 timekeeping_max_deferment(void);
188 extern int timekeeping_inject_offset(struct timespec *ts);
191 extern void do_sys_times(struct tms *);
194 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
195 * that the kernel source is self contained.
199 * the number of seconds after the minute, normally in the range
200 * 0 to 59, but can be up to 60 to allow for leap seconds
203 /* the number of minutes after the hour, in the range 0 to 59*/
205 /* the number of hours past midnight, in the range 0 to 23 */
207 /* the day of the month, in the range 1 to 31 */
209 /* the number of months since January, in the range 0 to 11 */
211 /* the number of years since 1900 */
213 /* the number of days since Sunday, in the range 0 to 6 */
215 /* the number of days since January 1, in the range 0 to 365 */
219 void time_to_tm(time_t totalsecs, int offset, struct tm *result);
222 * timespec_to_ns - Convert timespec to nanoseconds
223 * @ts: pointer to the timespec variable to be converted
225 * Returns the scalar nanosecond representation of the timespec
228 static inline s64 timespec_to_ns(const struct timespec *ts)
230 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
234 * timeval_to_ns - Convert timeval to nanoseconds
235 * @ts: pointer to the timeval variable to be converted
237 * Returns the scalar nanosecond representation of the timeval
240 static inline s64 timeval_to_ns(const struct timeval *tv)
242 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
243 tv->tv_usec * NSEC_PER_USEC;
247 * ns_to_timespec - Convert nanoseconds to timespec
248 * @nsec: the nanoseconds value to be converted
250 * Returns the timespec representation of the nsec parameter.
252 extern struct timespec ns_to_timespec(const s64 nsec);
255 * ns_to_timeval - Convert nanoseconds to timeval
256 * @nsec: the nanoseconds value to be converted
258 * Returns the timeval representation of the nsec parameter.
260 extern struct timeval ns_to_timeval(const s64 nsec);
263 * timespec_add_ns - Adds nanoseconds to a timespec
264 * @a: pointer to timespec to be incremented
265 * @ns: unsigned nanoseconds value to be added
267 * This must always be inlined because its used from the x86-64 vdso,
268 * which cannot call other kernel functions.
270 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
272 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
276 #endif /* __KERNEL__ */
279 * Names of the interval timers, and structure
280 * defining a timer setting:
282 #define ITIMER_REAL 0
283 #define ITIMER_VIRTUAL 1
284 #define ITIMER_PROF 2
287 struct timespec it_interval; /* timer period */
288 struct timespec it_value; /* timer expiration */
292 struct timeval it_interval; /* timer interval */
293 struct timeval it_value; /* current value */
297 * The IDs of the various system clocks (for POSIX.1b interval timers):
299 #define CLOCK_REALTIME 0
300 #define CLOCK_MONOTONIC 1
301 #define CLOCK_PROCESS_CPUTIME_ID 2
302 #define CLOCK_THREAD_CPUTIME_ID 3
303 #define CLOCK_MONOTONIC_RAW 4
304 #define CLOCK_REALTIME_COARSE 5
305 #define CLOCK_MONOTONIC_COARSE 6
306 #define CLOCK_BOOTTIME 7
307 #define CLOCK_REALTIME_ALARM 8
308 #define CLOCK_BOOTTIME_ALARM 9
311 * The IDs of various hardware clocks:
313 #define CLOCK_SGI_CYCLE 10
314 #define MAX_CLOCKS 16
315 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
316 #define CLOCKS_MONO CLOCK_MONOTONIC
319 * The various flags for setting POSIX.1b interval timers:
321 #define TIMER_ABSTIME 0x01