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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4#include <linux/types.h>
5
6#ifdef __KERNEL__
Thomas Gleixner82644452007-07-21 04:37:37 -07007# include <linux/cache.h>
Ingo Molnar57a55872006-01-09 20:52:26 -08008# include <linux/seqlock.h>
Jeremy Fitzhardingef595ec92008-06-12 10:47:56 +02009# include <linux/math64.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#endif
11
12#ifndef _STRUCT_TIMESPEC
13#define _STRUCT_TIMESPEC
14struct timespec {
Arnd Bergmann85efde62009-02-26 00:51:39 +010015 __kernel_time_t tv_sec; /* seconds */
16 long tv_nsec; /* nanoseconds */
Linus Torvalds1da177e2005-04-16 15:20:36 -070017};
Ingo Molnar57a55872006-01-09 20:52:26 -080018#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20struct timeval {
Arnd Bergmann85efde62009-02-26 00:51:39 +010021 __kernel_time_t tv_sec; /* seconds */
22 __kernel_suseconds_t tv_usec; /* microseconds */
Linus Torvalds1da177e2005-04-16 15:20:36 -070023};
24
25struct timezone {
26 int tz_minuteswest; /* minutes west of Greenwich */
27 int tz_dsttime; /* type of dst correction */
28};
29
30#ifdef __KERNEL__
31
Christoph Hellwigb418da12008-10-15 22:02:06 -070032extern struct timezone sys_tz;
33
Ingo Molnar57a55872006-01-09 20:52:26 -080034/* Parameters used to convert the timespec values: */
Vojtech Pavlik05ebb762006-06-26 13:58:20 +020035#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
Chris Wilson4936a3b2010-08-09 14:20:10 -070041#define FSEC_PER_SEC 1000000000000000LL
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Thomas Gleixnerdf0cc052008-08-31 08:09:53 -070043#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
44
Jan Engelhardt5b78cc92007-07-17 04:03:53 -070045static inline int timespec_equal(const struct timespec *a,
46 const struct timespec *b)
Ingo Molnar57a55872006-01-09 20:52:26 -080047{
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
Ingo Molnar57a55872006-01-09 20:52:26 -080049}
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Andrew Morton643a6542006-02-11 17:55:52 -080051/*
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
55 */
Rolf Eike Beer77adbfb2007-02-10 01:45:49 -080056static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
Andrew Morton643a6542006-02-11 17:55:52 -080057{
58 if (lhs->tv_sec < rhs->tv_sec)
59 return -1;
60 if (lhs->tv_sec > rhs->tv_sec)
61 return 1;
62 return lhs->tv_nsec - rhs->tv_nsec;
63}
64
Rolf Eike Beer77adbfb2007-02-10 01:45:49 -080065static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
Andrew Morton643a6542006-02-11 17:55:52 -080066{
67 if (lhs->tv_sec < rhs->tv_sec)
68 return -1;
69 if (lhs->tv_sec > rhs->tv_sec)
70 return 1;
71 return lhs->tv_usec - rhs->tv_usec;
72}
73
Ingo Molnarf4818902006-01-09 20:52:23 -080074extern 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);
77
Thomas Gleixner12e09332009-09-14 23:37:40 +020078extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
John Stultzce3bf7a2010-07-13 17:56:19 -070079
80/*
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.
84 */
Thomas Gleixnerdf0cc052008-08-31 08:09:53 -070085extern struct timespec timespec_add_safe(const struct timespec lhs,
86 const struct timespec rhs);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
John Stultzce3bf7a2010-07-13 17:56:19 -070088
89static inline struct timespec timespec_add(struct timespec lhs,
90 struct timespec rhs)
91{
92 struct timespec ts_delta;
93 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
94 lhs.tv_nsec + rhs.tv_nsec);
95 return ts_delta;
96}
97
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080098/*
Shailabh Nagarca74e922006-07-14 00:24:36 -070099 * sub = lhs - rhs, in normalized form
100 */
101static inline struct timespec timespec_sub(struct timespec lhs,
102 struct timespec rhs)
103{
104 struct timespec ts_delta;
105 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
106 lhs.tv_nsec - rhs.tv_nsec);
107 return ts_delta;
108}
109
110/*
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -0800111 * Returns true if the timespec is norm, false if denorm:
112 */
113#define timespec_valid(ts) \
Chris Wrightbd3f8f22006-01-31 19:10:23 -0800114 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -0800115
Martin Schwidefskyd4f587c2009-08-14 15:47:31 +0200116extern void read_persistent_clock(struct timespec *ts);
Martin Schwidefsky23970e32009-08-14 15:47:32 +0200117extern void read_boot_clock(struct timespec *ts);
Thomas Gleixner82644452007-07-21 04:37:37 -0700118extern int update_persistent_clock(struct timespec now);
119extern int no_sync_cmos_clock __read_mostly;
john stultzad596172006-06-26 00:25:06 -0700120void timekeeping_init(void);
Thomas Gleixner1c5745a2008-12-22 23:05:28 +0100121extern int timekeeping_suspended;
john stultzad596172006-06-26 00:25:06 -0700122
john stultz17c38b72007-07-24 18:38:34 -0700123unsigned long get_seconds(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124struct timespec current_kernel_time(void);
John Stultz8ab43512010-07-13 17:56:25 -0700125struct timespec __current_kernel_time(void); /* does not take xtime_lock */
john stultzda15cfd2009-08-19 19:13:34 -0700126struct timespec get_monotonic_coarse(void);
John Stultz314ac372011-02-14 18:43:08 -0800127void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
128 struct timespec *wtom, struct timespec *sleep);
John Stultz304529b2011-04-01 14:32:09 -0700129void timekeeping_inject_sleeptime(struct timespec *delta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Ingo Molnar57a55872006-01-09 20:52:26 -0800131#define CURRENT_TIME (current_kernel_time())
john stultz2c6b47d2007-07-24 17:47:43 -0700132#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
john stultz7d275582009-05-01 13:10:26 -0700134/* Some architectures do not supply their own clocksource.
135 * This is mainly the case in architectures that get their
136 * inter-tick times by reading the counter on their interval
137 * timer. Since these timers wrap every tick, they're not really
138 * useful as clocksources. Wrapping them to act like one is possible
139 * but not very efficient. So we provide a callout these arches
140 * can implement for use with the jiffies clocksource to provide
141 * finer then tick granular time.
142 */
143#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
144extern u32 arch_gettimeoffset(void);
145#else
146static inline u32 arch_gettimeoffset(void) { return 0; }
147#endif
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149extern void do_gettimeofday(struct timeval *tv);
Richard Cochran1e6d7672011-02-01 13:50:58 +0000150extern int do_settimeofday(const struct timespec *tv);
151extern int do_sys_settimeofday(const struct timespec *tv,
152 const struct timezone *tz);
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800153#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
David Howellsc7887322010-08-11 11:26:22 +0100154extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155struct itimerval;
Ingo Molnar57a55872006-01-09 20:52:26 -0800156extern int do_setitimer(int which, struct itimerval *value,
157 struct itimerval *ovalue);
Thomas Gleixnerc08b8a42006-03-25 03:06:33 -0800158extern unsigned int alarm_setitimer(unsigned int seconds);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159extern int do_getitimer(int which, struct itimerval *value);
Ingo Molnar57a55872006-01-09 20:52:26 -0800160extern void getnstimeofday(struct timespec *tv);
John Stultz2d422442008-08-20 16:37:30 -0700161extern void getrawmonotonic(struct timespec *ts);
Alexander Gordeeve2c18e42011-01-12 17:00:57 -0800162extern void getnstime_raw_and_real(struct timespec *ts_raw,
163 struct timespec *ts_real);
Tomas Janousek7c3f1a52007-07-15 23:39:41 -0700164extern void getboottime(struct timespec *ts);
165extern void monotonic_to_bootbased(struct timespec *ts);
John Stultzabb3a4e2011-02-14 17:52:09 -0800166extern void get_monotonic_boottime(struct timespec *ts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
Li Zefancf4fc6c2008-02-08 04:19:24 -0800169extern int timekeeping_valid_for_hres(void);
Jon Hunter98962462009-08-18 12:45:10 -0500170extern u64 timekeeping_max_deferment(void);
John Stultz31089c12009-08-14 15:47:18 +0200171extern void timekeeping_leap_insert(int leapsecond);
John Stultzc528f7c2011-02-01 13:52:17 +0000172extern int timekeeping_inject_offset(struct timespec *ts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Frank Mayharf06febc2008-09-12 09:54:39 -0700174struct tms;
175extern void do_sys_times(struct tms *);
176
Zhaolei57f1f082009-09-23 15:56:10 -0700177/*
178 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
179 * that the kernel source is self contained.
180 */
181struct tm {
182 /*
183 * the number of seconds after the minute, normally in the range
184 * 0 to 59, but can be up to 60 to allow for leap seconds
185 */
186 int tm_sec;
187 /* the number of minutes after the hour, in the range 0 to 59*/
188 int tm_min;
189 /* the number of hours past midnight, in the range 0 to 23 */
190 int tm_hour;
191 /* the day of the month, in the range 1 to 31 */
192 int tm_mday;
193 /* the number of months since January, in the range 0 to 11 */
194 int tm_mon;
195 /* the number of years since 1900 */
196 long tm_year;
197 /* the number of days since Sunday, in the range 0 to 6 */
198 int tm_wday;
199 /* the number of days since January 1, in the range 0 to 365 */
200 int tm_yday;
201};
202
203void time_to_tm(time_t totalsecs, int offset, struct tm *result);
204
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800205/**
206 * timespec_to_ns - Convert timespec to nanoseconds
207 * @ts: pointer to the timespec variable to be converted
208 *
209 * Returns the scalar nanosecond representation of the timespec
210 * parameter.
211 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800212static inline s64 timespec_to_ns(const struct timespec *ts)
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800213{
Roman Zippeldf869b62006-03-26 01:38:11 -0800214 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800215}
216
217/**
218 * timeval_to_ns - Convert timeval to nanoseconds
219 * @ts: pointer to the timeval variable to be converted
220 *
221 * Returns the scalar nanosecond representation of the timeval
222 * parameter.
223 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800224static inline s64 timeval_to_ns(const struct timeval *tv)
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800225{
Roman Zippeldf869b62006-03-26 01:38:11 -0800226 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800227 tv->tv_usec * NSEC_PER_USEC;
228}
229
230/**
231 * ns_to_timespec - Convert nanoseconds to timespec
232 * @nsec: the nanoseconds value to be converted
233 *
234 * Returns the timespec representation of the nsec parameter.
235 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800236extern struct timespec ns_to_timespec(const s64 nsec);
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800237
238/**
239 * ns_to_timeval - Convert nanoseconds to timeval
240 * @nsec: the nanoseconds value to be converted
241 *
242 * Returns the timeval representation of the nsec parameter.
243 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800244extern struct timeval ns_to_timeval(const s64 nsec);
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800245
john stultzcf3c7692006-06-26 00:25:08 -0700246/**
247 * timespec_add_ns - Adds nanoseconds to a timespec
248 * @a: pointer to timespec to be incremented
249 * @ns: unsigned nanoseconds value to be added
Jeremy Fitzhardinge9412e2862008-06-12 10:48:00 +0200250 *
251 * This must always be inlined because its used from the x86-64 vdso,
252 * which cannot call other kernel functions.
john stultzcf3c7692006-06-26 00:25:08 -0700253 */
Jeremy Fitzhardinge9412e2862008-06-12 10:48:00 +0200254static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
john stultzcf3c7692006-06-26 00:25:08 -0700255{
Jeremy Fitzhardinge9412e2862008-06-12 10:48:00 +0200256 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
john stultzcf3c7692006-06-26 00:25:08 -0700257 a->tv_nsec = ns;
258}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259#endif /* __KERNEL__ */
260
261#define NFDBITS __NFDBITS
262
263#define FD_SETSIZE __FD_SETSIZE
264#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
265#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
266#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
267#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
268
269/*
270 * Names of the interval timers, and structure
Ingo Molnar57a55872006-01-09 20:52:26 -0800271 * defining a timer setting:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 */
Ingo Molnar57a55872006-01-09 20:52:26 -0800273#define ITIMER_REAL 0
274#define ITIMER_VIRTUAL 1
275#define ITIMER_PROF 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Ingo Molnar57a55872006-01-09 20:52:26 -0800277struct itimerspec {
278 struct timespec it_interval; /* timer period */
279 struct timespec it_value; /* timer expiration */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280};
281
Ingo Molnar57a55872006-01-09 20:52:26 -0800282struct itimerval {
283 struct timeval it_interval; /* timer interval */
284 struct timeval it_value; /* current value */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285};
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800288 * The IDs of the various system clocks (for POSIX.1b interval timers):
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800290#define CLOCK_REALTIME 0
291#define CLOCK_MONOTONIC 1
292#define CLOCK_PROCESS_CPUTIME_ID 2
293#define CLOCK_THREAD_CPUTIME_ID 3
John Stultz2d422442008-08-20 16:37:30 -0700294#define CLOCK_MONOTONIC_RAW 4
john stultzda15cfd2009-08-19 19:13:34 -0700295#define CLOCK_REALTIME_COARSE 5
296#define CLOCK_MONOTONIC_COARSE 6
John Stultz70a08cc2011-02-15 10:45:16 -0800297#define CLOCK_BOOTTIME 7
John Stultz9a7adcf2011-01-11 09:54:33 -0800298#define CLOCK_REALTIME_ALARM 8
299#define CLOCK_BOOTTIME_ALARM 9
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800302 * The IDs of various hardware clocks:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800304#define CLOCK_SGI_CYCLE 10
305#define MAX_CLOCKS 16
306#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
307#define CLOCKS_MONO CLOCK_MONOTONIC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800310 * The various flags for setting POSIX.1b interval timers:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800312#define TIMER_ABSTIME 0x01
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314#endif