1 #ifndef _LINUX_TIME_H
2 #define _LINUX_TIME_H
3
4 #include <linux/types.h>
5
6 #ifdef __KERNEL__
7 # include <linux/cache.h>
8 # include <linux/seqlock.h>
9 # include <linux/math64.h>
10 #endif
11
12 #ifndef _STRUCT_TIMESPEC
13 #define _STRUCT_TIMESPEC
14 struct timespec {
15 __kernel_time_t tv_sec; /* seconds */
16 long tv_nsec; /* nanoseconds */
17 };
18 #endif
19
20 struct timeval {
21 __kernel_time_t tv_sec; /* seconds */
22 __kernel_suseconds_t tv_usec; /* microseconds */
23 };
24
25 struct timezone {
26 int tz_minuteswest; /* minutes west of Greenwich */
27 int tz_dsttime; /* type of dst correction */
28 };
29
30 #ifdef __KERNEL__
31
32 extern struct timezone sys_tz;
33
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
42
43 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
44
timespec_equal(const struct timespec * a,const struct timespec * b)45 static inline int timespec_equal(const struct timespec *a,
46 const struct timespec *b)
47 {
48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
49 }
50
51 /*
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
55 */
timespec_compare(const struct timespec * lhs,const struct timespec * rhs)56 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
57 {
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
timeval_compare(const struct timeval * lhs,const struct timeval * rhs)65 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
66 {
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
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);
77
78 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
79
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 */
85 extern struct timespec timespec_add_safe(const struct timespec lhs,
86 const struct timespec rhs);
87
88
timespec_add(struct timespec lhs,struct timespec rhs)89 static 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
98 /*
99 * sub = lhs - rhs, in normalized form
100 */
timespec_sub(struct timespec lhs,struct timespec rhs)101 static 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 /*
111 * Returns true if the timespec is norm, false if denorm:
112 */
113 #define timespec_valid(ts) \
114 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
115
116 extern void read_persistent_clock(struct timespec *ts);
117 extern void read_boot_clock(struct timespec *ts);
118 extern int update_persistent_clock(struct timespec now);
119 extern int no_sync_cmos_clock __read_mostly;
120 void timekeeping_init(void);
121 extern int timekeeping_suspended;
122
123 unsigned long get_seconds(void);
124 struct timespec current_kernel_time(void);
125 struct timespec __current_kernel_time(void); /* does not take xtime_lock */
126 struct timespec get_monotonic_coarse(void);
127 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
128 struct timespec *wtom, struct timespec *sleep);
129 void timekeeping_inject_sleeptime(struct timespec *delta);
130
131 #define CURRENT_TIME (current_kernel_time())
132 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
133
134 /* 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
144 extern u32 arch_gettimeoffset(void);
145 #else
arch_gettimeoffset(void)146 static inline u32 arch_gettimeoffset(void) { return 0; }
147 #endif
148
149 extern void do_gettimeofday(struct timeval *tv);
150 extern int do_settimeofday(const struct timespec *tv);
151 extern int do_sys_settimeofday(const struct timespec *tv,
152 const struct timezone *tz);
153 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
154 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
155 struct itimerval;
156 extern int do_setitimer(int which, struct itimerval *value,
157 struct itimerval *ovalue);
158 extern unsigned int alarm_setitimer(unsigned int seconds);
159 extern int do_getitimer(int which, struct itimerval *value);
160 extern void getnstimeofday(struct timespec *tv);
161 extern void getrawmonotonic(struct timespec *ts);
162 extern void getnstime_raw_and_real(struct timespec *ts_raw,
163 struct timespec *ts_real);
164 extern void getboottime(struct timespec *ts);
165 extern void monotonic_to_bootbased(struct timespec *ts);
166 extern void get_monotonic_boottime(struct timespec *ts);
167
168 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
169 extern int timekeeping_valid_for_hres(void);
170 extern u64 timekeeping_max_deferment(void);
171 extern void timekeeping_leap_insert(int leapsecond);
172 extern int timekeeping_inject_offset(struct timespec *ts);
173
174 struct tms;
175 extern void do_sys_times(struct tms *);
176
177 /*
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 */
181 struct 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
203 void time_to_tm(time_t totalsecs, int offset, struct tm *result);
204
205 /**
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 */
timespec_to_ns(const struct timespec * ts)212 static inline s64 timespec_to_ns(const struct timespec *ts)
213 {
214 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
215 }
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 */
timeval_to_ns(const struct timeval * tv)224 static inline s64 timeval_to_ns(const struct timeval *tv)
225 {
226 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
227 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 */
236 extern struct timespec ns_to_timespec(const s64 nsec);
237
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 */
244 extern struct timeval ns_to_timeval(const s64 nsec);
245
246 /**
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
250 *
251 * This must always be inlined because its used from the x86-64 vdso,
252 * which cannot call other kernel functions.
253 */
timespec_add_ns(struct timespec * a,u64 ns)254 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
255 {
256 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
257 a->tv_nsec = ns;
258 }
259 #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
271 * defining a timer setting:
272 */
273 #define ITIMER_REAL 0
274 #define ITIMER_VIRTUAL 1
275 #define ITIMER_PROF 2
276
277 struct itimerspec {
278 struct timespec it_interval; /* timer period */
279 struct timespec it_value; /* timer expiration */
280 };
281
282 struct itimerval {
283 struct timeval it_interval; /* timer interval */
284 struct timeval it_value; /* current value */
285 };
286
287 /*
288 * The IDs of the various system clocks (for POSIX.1b interval timers):
289 */
290 #define CLOCK_REALTIME 0
291 #define CLOCK_MONOTONIC 1
292 #define CLOCK_PROCESS_CPUTIME_ID 2
293 #define CLOCK_THREAD_CPUTIME_ID 3
294 #define CLOCK_MONOTONIC_RAW 4
295 #define CLOCK_REALTIME_COARSE 5
296 #define CLOCK_MONOTONIC_COARSE 6
297 #define CLOCK_BOOTTIME 7
298 #define CLOCK_REALTIME_ALARM 8
299 #define CLOCK_BOOTTIME_ALARM 9
300
301 /*
302 * The IDs of various hardware clocks:
303 */
304 #define CLOCK_SGI_CYCLE 10
305 #define MAX_CLOCKS 16
306 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
307 #define CLOCKS_MONO CLOCK_MONOTONIC
308
309 /*
310 * The various flags for setting POSIX.1b interval timers:
311 */
312 #define TIMER_ABSTIME 0x01
313
314 #endif
315