Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/* 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
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 * lhs < rhs: return <0
30 * lhs == rhs: return 0
31 * lhs > rhs: return >0
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 * 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.
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 * sub = lhs - rhs, in normalized form
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 * Returns true if the timespec is norm, false if denorm:
96 */
97static inline bool timespec_valid(const struct timespec *ts)
98{
99 /* Dates before 1970 are bogus */
100 if (ts->tv_sec < 0)
101 return false;
102 /* Can't have more nanoseconds then a second */
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 /* Disallow values that could overflow ktime_t */
113 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
114 return false;
115 return true;
116}
117
118extern void read_persistent_clock(struct timespec *ts);
119extern void read_boot_clock(struct timespec *ts);
120extern int update_persistent_clock(struct timespec now);
121void timekeeping_init(void);
122extern int timekeeping_suspended;
123
124unsigned long get_seconds(void);
125struct timespec current_kernel_time(void);
126struct timespec __current_kernel_time(void); /* does not take xtime_lock */
127struct timespec get_monotonic_coarse(void);
128void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
129 struct timespec *wtom, struct timespec *sleep);
130void timekeeping_inject_sleeptime(struct timespec *delta);
131
132#define CURRENT_TIME (current_kernel_time())
133#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
134
135/* Some architectures do not supply their own clocksource.
136 * This is mainly the case in architectures that get their
137 * inter-tick times by reading the counter on their interval
138 * timer. Since these timers wrap every tick, they're not really
139 * useful as clocksources. Wrapping them to act like one is possible
140 * but not very efficient. So we provide a callout these arches
141 * can implement for use with the jiffies clocksource to provide
142 * finer then tick granular time.
143 */
144#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
145extern u32 arch_gettimeoffset(void);
146#else
147static inline u32 arch_gettimeoffset(void) { return 0; }
148#endif
149
150extern void do_gettimeofday(struct timeval *tv);
151extern int do_settimeofday(const struct timespec *tv);
152extern int do_sys_settimeofday(const struct timespec *tv,
153 const struct timezone *tz);
154#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
155extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
156struct itimerval;
157extern int do_setitimer(int which, struct itimerval *value,
158 struct itimerval *ovalue);
159extern unsigned int alarm_setitimer(unsigned int seconds);
160extern int do_getitimer(int which, struct itimerval *value);
161extern void getnstimeofday(struct timespec *tv);
162extern void getrawmonotonic(struct timespec *ts);
163extern void getnstime_raw_and_real(struct timespec *ts_raw,
164 struct timespec *ts_real);
165extern void getboottime(struct timespec *ts);
166extern void monotonic_to_bootbased(struct timespec *ts);
167extern void get_monotonic_boottime(struct timespec *ts);
168
169extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
170extern int timekeeping_valid_for_hres(void);
171extern u64 timekeeping_max_deferment(void);
172extern int timekeeping_inject_offset(struct timespec *ts);
173
174struct tms;
175extern 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 */
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
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 */
212static 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 */
224static 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 */
236extern 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 */
244extern 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 */
254static __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
260#endif