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1da177e4 LT |
1 | #ifndef _LINUX_TIME_H |
2 | #define _LINUX_TIME_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | ||
6 | #ifdef __KERNEL__ | |
82644459 | 7 | # include <linux/cache.h> |
57a55875 | 8 | # include <linux/seqlock.h> |
f595ec96 | 9 | # include <linux/math64.h> |
1da177e4 LT |
10 | #endif |
11 | ||
12 | #ifndef _STRUCT_TIMESPEC | |
13 | #define _STRUCT_TIMESPEC | |
14 | struct timespec { | |
85efde6f AB |
15 | __kernel_time_t tv_sec; /* seconds */ |
16 | long tv_nsec; /* nanoseconds */ | |
1da177e4 | 17 | }; |
57a55875 | 18 | #endif |
1da177e4 LT |
19 | |
20 | struct timeval { | |
85efde6f AB |
21 | __kernel_time_t tv_sec; /* seconds */ |
22 | __kernel_suseconds_t tv_usec; /* microseconds */ | |
1da177e4 LT |
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 | ||
b418da16 CH |
32 | extern struct timezone sys_tz; |
33 | ||
57a55875 | 34 | /* Parameters used to convert the timespec values: */ |
05ebb761 VP |
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 1000000000000000L | |
1da177e4 | 42 | |
df0cc053 TG |
43 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
44 | ||
5b78cc9a JE |
45 | static inline int timespec_equal(const struct timespec *a, |
46 | const struct timespec *b) | |
57a55875 | 47 | { |
1da177e4 | 48 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
57a55875 | 49 | } |
1da177e4 | 50 | |
643a6545 AM |
51 | /* |
52 | * lhs < rhs: return <0 | |
53 | * lhs == rhs: return 0 | |
54 | * lhs > rhs: return >0 | |
55 | */ | |
77adbfbf | 56 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
643a6545 AM |
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 | ||
77adbfbf | 65 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
643a6545 AM |
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 | ||
f4818900 IM |
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, long nsec); | |
df0cc053 TG |
79 | extern struct timespec timespec_add_safe(const struct timespec lhs, |
80 | const struct timespec rhs); | |
1da177e4 | 81 | |
ca74e92b SN |
82 | /* |
83 | * sub = lhs - rhs, in normalized form | |
84 | */ | |
85 | static inline struct timespec timespec_sub(struct timespec lhs, | |
86 | struct timespec rhs) | |
87 | { | |
88 | struct timespec ts_delta; | |
89 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
90 | lhs.tv_nsec - rhs.tv_nsec); | |
91 | return ts_delta; | |
92 | } | |
93 | ||
5f82b2b7 TG |
94 | /* |
95 | * Returns true if the timespec is norm, false if denorm: | |
96 | */ | |
97 | #define timespec_valid(ts) \ | |
bd3f8f2b | 98 | (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) |
5f82b2b7 | 99 | |
1da177e4 LT |
100 | extern struct timespec xtime; |
101 | extern struct timespec wall_to_monotonic; | |
ba2a631b | 102 | extern seqlock_t xtime_lock; |
1da177e4 | 103 | |
411187fb | 104 | extern unsigned long read_persistent_clock(void); |
82644459 TG |
105 | extern int update_persistent_clock(struct timespec now); |
106 | extern int no_sync_cmos_clock __read_mostly; | |
ad596171 | 107 | void timekeeping_init(void); |
1c5745aa | 108 | extern int timekeeping_suspended; |
ad596171 | 109 | |
17c38b74 | 110 | unsigned long get_seconds(void); |
1da177e4 LT |
111 | struct timespec current_kernel_time(void); |
112 | ||
57a55875 | 113 | #define CURRENT_TIME (current_kernel_time()) |
2c6b47de | 114 | #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) |
1da177e4 | 115 | |
7d27558c | 116 | /* Some architectures do not supply their own clocksource. |
117 | * This is mainly the case in architectures that get their | |
118 | * inter-tick times by reading the counter on their interval | |
119 | * timer. Since these timers wrap every tick, they're not really | |
120 | * useful as clocksources. Wrapping them to act like one is possible | |
121 | * but not very efficient. So we provide a callout these arches | |
122 | * can implement for use with the jiffies clocksource to provide | |
123 | * finer then tick granular time. | |
124 | */ | |
125 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
126 | extern u32 arch_gettimeoffset(void); | |
127 | #else | |
128 | static inline u32 arch_gettimeoffset(void) { return 0; } | |
129 | #endif | |
130 | ||
1da177e4 LT |
131 | extern void do_gettimeofday(struct timeval *tv); |
132 | extern int do_settimeofday(struct timespec *tv); | |
133 | extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); | |
becf8b5d | 134 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
1c710c89 | 135 | extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); |
1da177e4 | 136 | struct itimerval; |
57a55875 IM |
137 | extern int do_setitimer(int which, struct itimerval *value, |
138 | struct itimerval *ovalue); | |
c08b8a49 | 139 | extern unsigned int alarm_setitimer(unsigned int seconds); |
1da177e4 | 140 | extern int do_getitimer(int which, struct itimerval *value); |
57a55875 | 141 | extern void getnstimeofday(struct timespec *tv); |
2d42244a | 142 | extern void getrawmonotonic(struct timespec *ts); |
7c3f1a57 TJ |
143 | extern void getboottime(struct timespec *ts); |
144 | extern void monotonic_to_bootbased(struct timespec *ts); | |
1da177e4 LT |
145 | |
146 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); | |
cf4fc6cb | 147 | extern int timekeeping_valid_for_hres(void); |
8524070b | 148 | extern void update_wall_time(void); |
1001d0a9 | 149 | extern void update_xtime_cache(u64 nsec); |
1da177e4 | 150 | |
f06febc9 FM |
151 | struct tms; |
152 | extern void do_sys_times(struct tms *); | |
153 | ||
f8f46da3 TG |
154 | /** |
155 | * timespec_to_ns - Convert timespec to nanoseconds | |
156 | * @ts: pointer to the timespec variable to be converted | |
157 | * | |
158 | * Returns the scalar nanosecond representation of the timespec | |
159 | * parameter. | |
160 | */ | |
df869b63 | 161 | static inline s64 timespec_to_ns(const struct timespec *ts) |
f8f46da3 | 162 | { |
df869b63 | 163 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
f8f46da3 TG |
164 | } |
165 | ||
166 | /** | |
167 | * timeval_to_ns - Convert timeval to nanoseconds | |
168 | * @ts: pointer to the timeval variable to be converted | |
169 | * | |
170 | * Returns the scalar nanosecond representation of the timeval | |
171 | * parameter. | |
172 | */ | |
df869b63 | 173 | static inline s64 timeval_to_ns(const struct timeval *tv) |
f8f46da3 | 174 | { |
df869b63 | 175 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
f8f46da3 TG |
176 | tv->tv_usec * NSEC_PER_USEC; |
177 | } | |
178 | ||
179 | /** | |
180 | * ns_to_timespec - Convert nanoseconds to timespec | |
181 | * @nsec: the nanoseconds value to be converted | |
182 | * | |
183 | * Returns the timespec representation of the nsec parameter. | |
184 | */ | |
df869b63 | 185 | extern struct timespec ns_to_timespec(const s64 nsec); |
f8f46da3 TG |
186 | |
187 | /** | |
188 | * ns_to_timeval - Convert nanoseconds to timeval | |
189 | * @nsec: the nanoseconds value to be converted | |
190 | * | |
191 | * Returns the timeval representation of the nsec parameter. | |
192 | */ | |
df869b63 | 193 | extern struct timeval ns_to_timeval(const s64 nsec); |
f8f46da3 | 194 | |
cf3c769b | 195 | /** |
196 | * timespec_add_ns - Adds nanoseconds to a timespec | |
197 | * @a: pointer to timespec to be incremented | |
198 | * @ns: unsigned nanoseconds value to be added | |
9412e286 JF |
199 | * |
200 | * This must always be inlined because its used from the x86-64 vdso, | |
201 | * which cannot call other kernel functions. | |
cf3c769b | 202 | */ |
9412e286 | 203 | static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) |
cf3c769b | 204 | { |
9412e286 | 205 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); |
cf3c769b | 206 | a->tv_nsec = ns; |
207 | } | |
1da177e4 LT |
208 | #endif /* __KERNEL__ */ |
209 | ||
210 | #define NFDBITS __NFDBITS | |
211 | ||
212 | #define FD_SETSIZE __FD_SETSIZE | |
213 | #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) | |
214 | #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) | |
215 | #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) | |
216 | #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) | |
217 | ||
218 | /* | |
219 | * Names of the interval timers, and structure | |
57a55875 | 220 | * defining a timer setting: |
1da177e4 | 221 | */ |
57a55875 IM |
222 | #define ITIMER_REAL 0 |
223 | #define ITIMER_VIRTUAL 1 | |
224 | #define ITIMER_PROF 2 | |
1da177e4 | 225 | |
57a55875 IM |
226 | struct itimerspec { |
227 | struct timespec it_interval; /* timer period */ | |
228 | struct timespec it_value; /* timer expiration */ | |
1da177e4 LT |
229 | }; |
230 | ||
57a55875 IM |
231 | struct itimerval { |
232 | struct timeval it_interval; /* timer interval */ | |
233 | struct timeval it_value; /* current value */ | |
1da177e4 LT |
234 | }; |
235 | ||
1da177e4 | 236 | /* |
57a55875 | 237 | * The IDs of the various system clocks (for POSIX.1b interval timers): |
1da177e4 | 238 | */ |
1ad106ca IM |
239 | #define CLOCK_REALTIME 0 |
240 | #define CLOCK_MONOTONIC 1 | |
241 | #define CLOCK_PROCESS_CPUTIME_ID 2 | |
242 | #define CLOCK_THREAD_CPUTIME_ID 3 | |
2d42244a | 243 | #define CLOCK_MONOTONIC_RAW 4 |
1da177e4 LT |
244 | |
245 | /* | |
57a55875 | 246 | * The IDs of various hardware clocks: |
1da177e4 | 247 | */ |
1ad106ca IM |
248 | #define CLOCK_SGI_CYCLE 10 |
249 | #define MAX_CLOCKS 16 | |
250 | #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) | |
251 | #define CLOCKS_MONO CLOCK_MONOTONIC | |
1da177e4 LT |
252 | |
253 | /* | |
57a55875 | 254 | * The various flags for setting POSIX.1b interval timers: |
1da177e4 | 255 | */ |
1ad106ca | 256 | #define TIMER_ABSTIME 0x01 |
1da177e4 LT |
257 | |
258 | #endif |