1#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4# include <linux/cache.h>
5# include <linux/seqlock.h>
6# include <linux/math64.h>
7#include <uapi/linux/time.h>
8
9extern struct timezone sys_tz;
10
11
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
19
20#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
21
22static inline int timespec_equal(const struct timespec *a,
23 const struct timespec *b)
24{
25 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
26}
27
28
29
30
31
32
33static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
34{
35 if (lhs->tv_sec < rhs->tv_sec)
36 return -1;
37 if (lhs->tv_sec > rhs->tv_sec)
38 return 1;
39 return lhs->tv_nsec - rhs->tv_nsec;
40}
41
42static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
43{
44 if (lhs->tv_sec < rhs->tv_sec)
45 return -1;
46 if (lhs->tv_sec > rhs->tv_sec)
47 return 1;
48 return lhs->tv_usec - rhs->tv_usec;
49}
50
51extern 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);
54
55extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
56
57
58
59
60
61
62extern struct timespec timespec_add_safe(const struct timespec lhs,
63 const struct timespec rhs);
64
65
66static inline struct timespec timespec_add(struct timespec lhs,
67 struct timespec rhs)
68{
69 struct timespec ts_delta;
70 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
71 lhs.tv_nsec + rhs.tv_nsec);
72 return ts_delta;
73}
74
75
76
77
78static inline struct timespec timespec_sub(struct timespec lhs,
79 struct timespec rhs)
80{
81 struct timespec ts_delta;
82 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
83 lhs.tv_nsec - rhs.tv_nsec);
84 return ts_delta;
85}
86
87#define KTIME_MAX ((s64)~((u64)1 << 63))
88#if (BITS_PER_LONG == 64)
89# define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
90#else
91# define KTIME_SEC_MAX LONG_MAX
92#endif
93
94
95
96
97static inline bool timespec_valid(const struct timespec *ts)
98{
99
100 if (ts->tv_sec < 0)
101 return false;
102
103 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
104 return false;
105 return true;
106}
107
108static inline bool timespec_valid_strict(const struct timespec *ts)
109{
110 if (!timespec_valid(ts))
111 return false;
112
113 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
114 return false;
115 return true;
116}
117
118extern bool persistent_clock_exist;
119
120static inline bool has_persistent_clock(void)
121{
122 return persistent_clock_exist;
123}
124
125extern void read_persistent_clock(struct timespec *ts);
126extern void read_boot_clock(struct timespec *ts);
127extern int persistent_clock_is_local;
128extern int update_persistent_clock(struct timespec now);
129void timekeeping_init(void);
130extern int timekeeping_suspended;
131
132unsigned long get_seconds(void);
133struct timespec current_kernel_time(void);
134struct timespec __current_kernel_time(void);
135struct timespec get_monotonic_coarse(void);
136void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
137 struct timespec *wtom, struct timespec *sleep);
138void timekeeping_inject_sleeptime(struct timespec *delta);
139
140#define CURRENT_TIME (current_kernel_time())
141#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
142
143
144
145
146
147
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149
150
151
152#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
153extern u32 (*arch_gettimeoffset)(void);
154#endif
155
156extern void do_gettimeofday(struct timeval *tv);
157extern int do_settimeofday(const struct timespec *tv);
158extern int do_sys_settimeofday(const struct timespec *tv,
159 const struct timezone *tz);
160#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
161extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
162struct itimerval;
163extern int do_setitimer(int which, struct itimerval *value,
164 struct itimerval *ovalue);
165extern unsigned int alarm_setitimer(unsigned int seconds);
166extern int do_getitimer(int which, struct itimerval *value);
167extern int __getnstimeofday(struct timespec *tv);
168extern void getnstimeofday(struct timespec *tv);
169extern void getrawmonotonic(struct timespec *ts);
170extern void getnstime_raw_and_real(struct timespec *ts_raw,
171 struct timespec *ts_real);
172extern void getboottime(struct timespec *ts);
173extern void monotonic_to_bootbased(struct timespec *ts);
174extern void get_monotonic_boottime(struct timespec *ts);
175
176extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
177extern int timekeeping_valid_for_hres(void);
178extern u64 timekeeping_max_deferment(void);
179extern int timekeeping_inject_offset(struct timespec *ts);
180extern s32 timekeeping_get_tai_offset(void);
181extern void timekeeping_set_tai_offset(s32 tai_offset);
182extern void timekeeping_clocktai(struct timespec *ts);
183
184struct tms;
185extern void do_sys_times(struct tms *);
186
187
188
189
190
191struct tm {
192
193
194
195
196 int tm_sec;
197
198 int tm_min;
199
200 int tm_hour;
201
202 int tm_mday;
203
204 int tm_mon;
205
206 long tm_year;
207
208 int tm_wday;
209
210 int tm_yday;
211};
212
213void time_to_tm(time_t totalsecs, int offset, struct tm *result);
214
215
216
217
218
219
220
221
222static inline s64 timespec_to_ns(const struct timespec *ts)
223{
224 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
225}
226
227
228
229
230
231
232
233
234static inline s64 timeval_to_ns(const struct timeval *tv)
235{
236 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
237 tv->tv_usec * NSEC_PER_USEC;
238}
239
240
241
242
243
244
245
246extern struct timespec ns_to_timespec(const s64 nsec);
247
248
249
250
251
252
253
254extern struct timeval ns_to_timeval(const s64 nsec);
255
256
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262
263
264static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
265{
266 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
267 a->tv_nsec = ns;
268}
269
270#endif
271