1 #ifndef _LINUX_TIME_H 2 #define _LINUX_TIME_H 3 4 #include <linux/types.h> 5 6 #ifdef __KERNEL__ 7 # include <linux/cache.h> 8 # include <linux/seqlock.h> 9 # include <linux/math64.h> 10 #endif 11 12 #ifndef _STRUCT_TIMESPEC 13 #define _STRUCT_TIMESPEC 14 struct timespec { 15 __kernel_time_t tv_sec; /* seconds */ 16 long tv_nsec; /* nanoseconds */ 17 }; 18 #endif 19 20 struct timeval { 21 __kernel_time_t tv_sec; /* seconds */ 22 __kernel_suseconds_t tv_usec; /* microseconds */ 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 32 extern struct timezone sys_tz; 33 34 /* Parameters used to convert the timespec values: */ 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 1000000000000000LL 42 43 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) 44 45 static inline int timespec_equal(const struct timespec *a, 46 const struct timespec *b) 47 { 48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 49 } 50 51 /* 52 * lhs < rhs: return <0 53 * lhs == rhs: return 0 54 * lhs > rhs: return >0 55 */ 56 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) 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 65 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) 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 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, s64 nsec); 79 80 /* 81 * timespec_add_safe assumes both values are positive and checks 82 * for overflow. It will return TIME_T_MAX if the reutrn would be 83 * smaller then either of the arguments. 84 */ 85 extern struct timespec timespec_add_safe(const struct timespec lhs, 86 const struct timespec rhs); 87 88 89 static inline struct timespec timespec_add(struct timespec lhs, 90 struct timespec rhs) 91 { 92 struct timespec ts_delta; 93 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec, 94 lhs.tv_nsec + rhs.tv_nsec); 95 return ts_delta; 96 } 97 98 /* 99 * sub = lhs - rhs, in normalized form 100 */ 101 static inline struct timespec timespec_sub(struct timespec lhs, 102 struct timespec rhs) 103 { 104 struct timespec ts_delta; 105 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 106 lhs.tv_nsec - rhs.tv_nsec); 107 return ts_delta; 108 } 109 110 #define KTIME_MAX ((s64)~((u64)1 << 63)) 111 #if (BITS_PER_LONG == 64) 112 # define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) 113 #else 114 # define KTIME_SEC_MAX LONG_MAX 115 #endif 116 117 /* 118 * Returns true if the timespec is norm, false if denorm: 119 */ 120 static inline bool timespec_valid(const struct timespec *ts) 121 { 122 /* Dates before 1970 are bogus */ 123 if (ts->tv_sec < 0) 124 return false; 125 /* Can't have more nanoseconds then a second */ 126 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 127 return false; 128 return true; 129 } 130 131 static inline bool timespec_valid_strict(const struct timespec *ts) 132 { 133 if (!timespec_valid(ts)) 134 return false; 135 /* Disallow values that could overflow ktime_t */ 136 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 137 return false; 138 return true; 139 } 140 141 extern void read_persistent_clock(struct timespec *ts); 142 extern void read_boot_clock(struct timespec *ts); 143 extern int update_persistent_clock(struct timespec now); 144 void timekeeping_init(void); 145 extern int timekeeping_suspended; 146 147 unsigned long get_seconds(void); 148 struct timespec current_kernel_time(void); 149 struct timespec __current_kernel_time(void); /* does not take xtime_lock */ 150 struct timespec get_monotonic_coarse(void); 151 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, 152 struct timespec *wtom, struct timespec *sleep); 153 void timekeeping_inject_sleeptime(struct timespec *delta); 154 155 #define CURRENT_TIME (current_kernel_time()) 156 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 157 158 /* Some architectures do not supply their own clocksource. 159 * This is mainly the case in architectures that get their 160 * inter-tick times by reading the counter on their interval 161 * timer. Since these timers wrap every tick, they're not really 162 * useful as clocksources. Wrapping them to act like one is possible 163 * but not very efficient. So we provide a callout these arches 164 * can implement for use with the jiffies clocksource to provide 165 * finer then tick granular time. 166 */ 167 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 168 extern u32 arch_gettimeoffset(void); 169 #else 170 static inline u32 arch_gettimeoffset(void) { return 0; } 171 #endif 172 173 extern void do_gettimeofday(struct timeval *tv); 174 extern int do_settimeofday(const struct timespec *tv); 175 extern int do_sys_settimeofday(const struct timespec *tv, 176 const struct timezone *tz); 177 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 178 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); 179 struct itimerval; 180 extern int do_setitimer(int which, struct itimerval *value, 181 struct itimerval *ovalue); 182 extern unsigned int alarm_setitimer(unsigned int seconds); 183 extern int do_getitimer(int which, struct itimerval *value); 184 extern void getnstimeofday(struct timespec *tv); 185 extern void getrawmonotonic(struct timespec *ts); 186 extern void getnstime_raw_and_real(struct timespec *ts_raw, 187 struct timespec *ts_real); 188 extern void getboottime(struct timespec *ts); 189 extern void monotonic_to_bootbased(struct timespec *ts); 190 extern void get_monotonic_boottime(struct timespec *ts); 191 192 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 193 extern int timekeeping_valid_for_hres(void); 194 extern u64 timekeeping_max_deferment(void); 195 extern int timekeeping_inject_offset(struct timespec *ts); 196 197 struct tms; 198 extern void do_sys_times(struct tms *); 199 200 /* 201 * Similar to the struct tm in userspace <time.h>, but it needs to be here so 202 * that the kernel source is self contained. 203 */ 204 struct tm { 205 /* 206 * the number of seconds after the minute, normally in the range 207 * 0 to 59, but can be up to 60 to allow for leap seconds 208 */ 209 int tm_sec; 210 /* the number of minutes after the hour, in the range 0 to 59*/ 211 int tm_min; 212 /* the number of hours past midnight, in the range 0 to 23 */ 213 int tm_hour; 214 /* the day of the month, in the range 1 to 31 */ 215 int tm_mday; 216 /* the number of months since January, in the range 0 to 11 */ 217 int tm_mon; 218 /* the number of years since 1900 */ 219 long tm_year; 220 /* the number of days since Sunday, in the range 0 to 6 */ 221 int tm_wday; 222 /* the number of days since January 1, in the range 0 to 365 */ 223 int tm_yday; 224 }; 225 226 void time_to_tm(time_t totalsecs, int offset, struct tm *result); 227 228 /** 229 * timespec_to_ns - Convert timespec to nanoseconds 230 * @ts: pointer to the timespec variable to be converted 231 * 232 * Returns the scalar nanosecond representation of the timespec 233 * parameter. 234 */ 235 static inline s64 timespec_to_ns(const struct timespec *ts) 236 { 237 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 238 } 239 240 /** 241 * timeval_to_ns - Convert timeval to nanoseconds 242 * @ts: pointer to the timeval variable to be converted 243 * 244 * Returns the scalar nanosecond representation of the timeval 245 * parameter. 246 */ 247 static inline s64 timeval_to_ns(const struct timeval *tv) 248 { 249 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 250 tv->tv_usec * NSEC_PER_USEC; 251 } 252 253 /** 254 * ns_to_timespec - Convert nanoseconds to timespec 255 * @nsec: the nanoseconds value to be converted 256 * 257 * Returns the timespec representation of the nsec parameter. 258 */ 259 extern struct timespec ns_to_timespec(const s64 nsec); 260 261 /** 262 * ns_to_timeval - Convert nanoseconds to timeval 263 * @nsec: the nanoseconds value to be converted 264 * 265 * Returns the timeval representation of the nsec parameter. 266 */ 267 extern struct timeval ns_to_timeval(const s64 nsec); 268 269 /** 270 * timespec_add_ns - Adds nanoseconds to a timespec 271 * @a: pointer to timespec to be incremented 272 * @ns: unsigned nanoseconds value to be added 273 * 274 * This must always be inlined because its used from the x86-64 vdso, 275 * which cannot call other kernel functions. 276 */ 277 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 278 { 279 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 280 a->tv_nsec = ns; 281 } 282 283 #endif /* __KERNEL__ */ 284 285 /* 286 * Names of the interval timers, and structure 287 * defining a timer setting: 288 */ 289 #define ITIMER_REAL 0 290 #define ITIMER_VIRTUAL 1 291 #define ITIMER_PROF 2 292 293 struct itimerspec { 294 struct timespec it_interval; /* timer period */ 295 struct timespec it_value; /* timer expiration */ 296 }; 297 298 struct itimerval { 299 struct timeval it_interval; /* timer interval */ 300 struct timeval it_value; /* current value */ 301 }; 302 303 /* 304 * The IDs of the various system clocks (for POSIX.1b interval timers): 305 */ 306 #define CLOCK_REALTIME 0 307 #define CLOCK_MONOTONIC 1 308 #define CLOCK_PROCESS_CPUTIME_ID 2 309 #define CLOCK_THREAD_CPUTIME_ID 3 310 #define CLOCK_MONOTONIC_RAW 4 311 #define CLOCK_REALTIME_COARSE 5 312 #define CLOCK_MONOTONIC_COARSE 6 313 #define CLOCK_BOOTTIME 7 314 #define CLOCK_REALTIME_ALARM 8 315 #define CLOCK_BOOTTIME_ALARM 9 316 317 /* 318 * The IDs of various hardware clocks: 319 */ 320 #define CLOCK_SGI_CYCLE 10 321 #define MAX_CLOCKS 16 322 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 323 #define CLOCKS_MONO CLOCK_MONOTONIC 324 325 /* 326 * The various flags for setting POSIX.1b interval timers: 327 */ 328 #define TIMER_ABSTIME 0x01 329 330 #endif 331