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1da177e4 LT |
1 | #ifndef _LINUX_TIME_H |
2 | #define _LINUX_TIME_H | |
3 | ||
82644459 | 4 | # include <linux/cache.h> |
57a55875 | 5 | # include <linux/seqlock.h> |
f595ec96 | 6 | # include <linux/math64.h> |
607ca46e | 7 | #include <uapi/linux/time.h> |
1da177e4 | 8 | |
b418da16 CH |
9 | extern struct timezone sys_tz; |
10 | ||
57a55875 | 11 | /* Parameters used to convert the timespec values: */ |
05ebb761 VP |
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 | |
4936a3b9 | 18 | #define FSEC_PER_SEC 1000000000000000LL |
1da177e4 | 19 | |
df0cc053 TG |
20 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
21 | ||
5b78cc9a JE |
22 | static inline int timespec_equal(const struct timespec *a, |
23 | const struct timespec *b) | |
57a55875 | 24 | { |
1da177e4 | 25 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
57a55875 | 26 | } |
1da177e4 | 27 | |
643a6545 AM |
28 | /* |
29 | * lhs < rhs: return <0 | |
30 | * lhs == rhs: return 0 | |
31 | * lhs > rhs: return >0 | |
32 | */ | |
77adbfbf | 33 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
643a6545 AM |
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 | ||
77adbfbf | 42 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
643a6545 AM |
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 | ||
f4818900 IM |
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); | |
54 | ||
12e09337 | 55 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); |
ce3bf7ab JS |
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 | */ | |
df0cc053 TG |
62 | extern struct timespec timespec_add_safe(const struct timespec lhs, |
63 | const struct timespec rhs); | |
1da177e4 | 64 | |
ce3bf7ab JS |
65 | |
66 | static 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 | ||
ca74e92b SN |
75 | /* |
76 | * sub = lhs - rhs, in normalized form | |
77 | */ | |
78 | static 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 | ||
4e8b1452 JS |
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 | ||
5f82b2b7 TG |
94 | /* |
95 | * Returns true if the timespec is norm, false if denorm: | |
96 | */ | |
4e8b1452 JS |
97 | static 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; | |
cee58483 JS |
105 | return true; |
106 | } | |
107 | ||
108 | static inline bool timespec_valid_strict(const struct timespec *ts) | |
109 | { | |
110 | if (!timespec_valid(ts)) | |
111 | return false; | |
4e8b1452 JS |
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 | } | |
5f82b2b7 | 117 | |
d4f587c6 | 118 | extern void read_persistent_clock(struct timespec *ts); |
23970e38 | 119 | extern void read_boot_clock(struct timespec *ts); |
82644459 | 120 | extern int update_persistent_clock(struct timespec now); |
ad596171 | 121 | void timekeeping_init(void); |
1c5745aa | 122 | extern int timekeeping_suspended; |
ad596171 | 123 | |
17c38b74 | 124 | unsigned long get_seconds(void); |
1da177e4 | 125 | struct timespec current_kernel_time(void); |
8ab4351a | 126 | struct timespec __current_kernel_time(void); /* does not take xtime_lock */ |
da15cfda | 127 | struct timespec get_monotonic_coarse(void); |
314ac371 JS |
128 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
129 | struct timespec *wtom, struct timespec *sleep); | |
304529b1 | 130 | void timekeeping_inject_sleeptime(struct timespec *delta); |
1da177e4 | 131 | |
57a55875 | 132 | #define CURRENT_TIME (current_kernel_time()) |
2c6b47de | 133 | #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) |
1da177e4 | 134 | |
7d27558c JS |
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 | |
145 | extern u32 arch_gettimeoffset(void); | |
146 | #else | |
147 | static inline u32 arch_gettimeoffset(void) { return 0; } | |
148 | #endif | |
149 | ||
1da177e4 | 150 | extern void do_gettimeofday(struct timeval *tv); |
1e6d7679 RC |
151 | extern int do_settimeofday(const struct timespec *tv); |
152 | extern int do_sys_settimeofday(const struct timespec *tv, | |
153 | const struct timezone *tz); | |
becf8b5d | 154 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
c7887325 | 155 | extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); |
1da177e4 | 156 | struct itimerval; |
57a55875 IM |
157 | extern int do_setitimer(int which, struct itimerval *value, |
158 | struct itimerval *ovalue); | |
c08b8a49 | 159 | extern unsigned int alarm_setitimer(unsigned int seconds); |
1da177e4 | 160 | extern int do_getitimer(int which, struct itimerval *value); |
57a55875 | 161 | extern void getnstimeofday(struct timespec *tv); |
2d42244a | 162 | extern void getrawmonotonic(struct timespec *ts); |
e2c18e49 AG |
163 | extern void getnstime_raw_and_real(struct timespec *ts_raw, |
164 | struct timespec *ts_real); | |
7c3f1a57 TJ |
165 | extern void getboottime(struct timespec *ts); |
166 | extern void monotonic_to_bootbased(struct timespec *ts); | |
abb3a4ea | 167 | extern void get_monotonic_boottime(struct timespec *ts); |
1da177e4 LT |
168 | |
169 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); | |
cf4fc6cb | 170 | extern int timekeeping_valid_for_hres(void); |
98962465 | 171 | extern u64 timekeeping_max_deferment(void); |
c528f7c6 | 172 | extern int timekeeping_inject_offset(struct timespec *ts); |
1da177e4 | 173 | |
f06febc9 FM |
174 | struct tms; |
175 | extern void do_sys_times(struct tms *); | |
176 | ||
57f1f087 Z |
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 | ||
f8f46da3 TG |
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 | */ | |
df869b63 | 212 | static inline s64 timespec_to_ns(const struct timespec *ts) |
f8f46da3 | 213 | { |
df869b63 | 214 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
f8f46da3 TG |
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 | */ | |
df869b63 | 224 | static inline s64 timeval_to_ns(const struct timeval *tv) |
f8f46da3 | 225 | { |
df869b63 | 226 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
f8f46da3 TG |
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 | */ | |
df869b63 | 236 | extern struct timespec ns_to_timespec(const s64 nsec); |
f8f46da3 TG |
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 | */ | |
df869b63 | 244 | extern struct timeval ns_to_timeval(const s64 nsec); |
f8f46da3 | 245 | |
cf3c769b JS |
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 | |
9412e286 JF |
250 | * |
251 | * This must always be inlined because its used from the x86-64 vdso, | |
252 | * which cannot call other kernel functions. | |
cf3c769b | 253 | */ |
9412e286 | 254 | static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) |
cf3c769b | 255 | { |
9412e286 | 256 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); |
cf3c769b JS |
257 | a->tv_nsec = ns; |
258 | } | |
8b3d1cda | 259 | |
1da177e4 | 260 | #endif |