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 static inline bool has_persistent_clock(void)
122 return persistent_clock_exist
;
125 extern void read_persistent_clock(struct timespec
*ts
);
126 extern void read_boot_clock(struct timespec
*ts
);
127 extern int persistent_clock_is_local
;
128 extern int update_persistent_clock(struct timespec now
);
129 void timekeeping_init(void);
130 extern int timekeeping_suspended
;
132 unsigned long get_seconds(void);
133 struct timespec
current_kernel_time(void);
134 struct timespec
__current_kernel_time(void); /* does not take xtime_lock */
135 struct timespec
get_monotonic_coarse(void);
136 void get_xtime_and_monotonic_and_sleep_offset(struct timespec
*xtim
,
137 struct timespec
*wtom
, struct timespec
*sleep
);
138 void timekeeping_inject_sleeptime(struct timespec
*delta
);
140 #define CURRENT_TIME (current_kernel_time())
141 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
143 /* Some architectures do not supply their own clocksource.
144 * This is mainly the case in architectures that get their
145 * inter-tick times by reading the counter on their interval
146 * timer. Since these timers wrap every tick, they're not really
147 * useful as clocksources. Wrapping them to act like one is possible
148 * but not very efficient. So we provide a callout these arches
149 * can implement for use with the jiffies clocksource to provide
150 * finer then tick granular time.
152 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
153 extern u32 (*arch_gettimeoffset
)(void);
156 extern void do_gettimeofday(struct timeval
*tv
);
157 extern int do_settimeofday(const struct timespec
*tv
);
158 extern 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)
161 extern long do_utimes(int dfd
, const char __user
*filename
, struct timespec
*times
, int flags
);
163 extern int do_setitimer(int which
, struct itimerval
*value
,
164 struct itimerval
*ovalue
);
165 extern unsigned int alarm_setitimer(unsigned int seconds
);
166 extern int do_getitimer(int which
, struct itimerval
*value
);
167 extern int __getnstimeofday(struct timespec
*tv
);
168 extern void getnstimeofday(struct timespec
*tv
);
169 extern void getrawmonotonic(struct timespec
*ts
);
170 extern void getnstime_raw_and_real(struct timespec
*ts_raw
,
171 struct timespec
*ts_real
);
172 extern void getboottime(struct timespec
*ts
);
173 extern void monotonic_to_bootbased(struct timespec
*ts
);
174 extern void get_monotonic_boottime(struct timespec
*ts
);
176 extern struct timespec
timespec_trunc(struct timespec t
, unsigned gran
);
177 extern int timekeeping_valid_for_hres(void);
178 extern u64
timekeeping_max_deferment(void);
179 extern int timekeeping_inject_offset(struct timespec
*ts
);
180 extern s32
timekeeping_get_tai_offset(void);
181 extern void timekeeping_set_tai_offset(s32 tai_offset
);
182 extern void timekeeping_clocktai(struct timespec
*ts
);
185 extern void do_sys_times(struct tms
*);
188 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
189 * that the kernel source is self contained.
193 * the number of seconds after the minute, normally in the range
194 * 0 to 59, but can be up to 60 to allow for leap seconds
197 /* the number of minutes after the hour, in the range 0 to 59*/
199 /* the number of hours past midnight, in the range 0 to 23 */
201 /* the day of the month, in the range 1 to 31 */
203 /* the number of months since January, in the range 0 to 11 */
205 /* the number of years since 1900 */
207 /* the number of days since Sunday, in the range 0 to 6 */
209 /* the number of days since January 1, in the range 0 to 365 */
213 void time_to_tm(time_t totalsecs
, int offset
, struct tm
*result
);
216 * timespec_to_ns - Convert timespec to nanoseconds
217 * @ts: pointer to the timespec variable to be converted
219 * Returns the scalar nanosecond representation of the timespec
222 static inline s64
timespec_to_ns(const struct timespec
*ts
)
224 return ((s64
) ts
->tv_sec
* NSEC_PER_SEC
) + ts
->tv_nsec
;
228 * timeval_to_ns - Convert timeval to nanoseconds
229 * @ts: pointer to the timeval variable to be converted
231 * Returns the scalar nanosecond representation of the timeval
234 static inline s64
timeval_to_ns(const struct timeval
*tv
)
236 return ((s64
) tv
->tv_sec
* NSEC_PER_SEC
) +
237 tv
->tv_usec
* NSEC_PER_USEC
;
241 * ns_to_timespec - Convert nanoseconds to timespec
242 * @nsec: the nanoseconds value to be converted
244 * Returns the timespec representation of the nsec parameter.
246 extern struct timespec
ns_to_timespec(const s64 nsec
);
249 * ns_to_timeval - Convert nanoseconds to timeval
250 * @nsec: the nanoseconds value to be converted
252 * Returns the timeval representation of the nsec parameter.
254 extern struct timeval
ns_to_timeval(const s64 nsec
);
257 * timespec_add_ns - Adds nanoseconds to a timespec
258 * @a: pointer to timespec to be incremented
259 * @ns: unsigned nanoseconds value to be added
261 * This must always be inlined because its used from the x86-64 vdso,
262 * which cannot call other kernel functions.
264 static __always_inline
void timespec_add_ns(struct timespec
*a
, u64 ns
)
266 a
->tv_sec
+= __iter_div_u64_rem(a
->tv_nsec
+ ns
, NSEC_PER_SEC
, &ns
);