#ifndef _LINUX_TIME_H #define _LINUX_TIME_H # include # include # include #include extern struct timezone sys_tz; /* Parameters used to convert the timespec values: */ #define MSEC_PER_SEC 1000L #define USEC_PER_MSEC 1000L #define NSEC_PER_USEC 1000L #define NSEC_PER_MSEC 1000000L #define USEC_PER_SEC 1000000L #define NSEC_PER_SEC 1000000000L #define FSEC_PER_SEC 1000000000000000LL #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) static inline int timespec_equal(const struct timespec *a, const struct timespec *b) { return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); } /* * lhs < rhs: return <0 * lhs == rhs: return 0 * lhs > rhs: return >0 */ static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) { if (lhs->tv_sec < rhs->tv_sec) return -1; if (lhs->tv_sec > rhs->tv_sec) return 1; return lhs->tv_nsec - rhs->tv_nsec; } static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) { if (lhs->tv_sec < rhs->tv_sec) return -1; if (lhs->tv_sec > rhs->tv_sec) return 1; return lhs->tv_usec - rhs->tv_usec; } extern unsigned long mktime(const unsigned int year, const unsigned int mon, const unsigned int day, const unsigned int hour, const unsigned int min, const unsigned int sec); extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); /* * timespec_add_safe assumes both values are positive and checks * for overflow. It will return TIME_T_MAX if the reutrn would be * smaller then either of the arguments. */ extern struct timespec timespec_add_safe(const struct timespec lhs, const struct timespec rhs); static inline struct timespec timespec_add(struct timespec lhs, struct timespec rhs) { struct timespec ts_delta; set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec, lhs.tv_nsec + rhs.tv_nsec); return ts_delta; } /* * sub = lhs - rhs, in normalized form */ static inline struct timespec timespec_sub(struct timespec lhs, struct timespec rhs) { struct timespec ts_delta; set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, lhs.tv_nsec - rhs.tv_nsec); return ts_delta; } #define KTIME_MAX ((s64)~((u64)1 << 63)) #if (BITS_PER_LONG == 64) # define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) #else # define KTIME_SEC_MAX LONG_MAX #endif /* * Returns true if the timespec is norm, false if denorm: */ static inline bool timespec_valid(const struct timespec *ts) { /* Dates before 1970 are bogus */ if (ts->tv_sec < 0) return false; /* Can't have more nanoseconds then a second */ if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) return false; return true; } static inline bool timespec_valid_strict(const struct timespec *ts) { if (!timespec_valid(ts)) return false; /* Disallow values that could overflow ktime_t */ if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) return false; return true; } extern bool persistent_clock_exist; static inline bool has_persistent_clock(void) { return persistent_clock_exist; } extern void read_persistent_clock(struct timespec *ts); extern void read_boot_clock(struct timespec *ts); extern int persistent_clock_is_local; extern int update_persistent_clock(struct timespec now); void timekeeping_init(void); extern int timekeeping_suspended; unsigned long get_seconds(void); struct timespec current_kernel_time(void); struct timespec __current_kernel_time(void); /* does not take xtime_lock */ struct timespec get_monotonic_coarse(void); void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, struct timespec *wtom, struct timespec *sleep); void timekeeping_inject_sleeptime(struct timespec *delta); #define CURRENT_TIME (current_kernel_time()) #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) /* Some architectures do not supply their own clocksource. * This is mainly the case in architectures that get their * inter-tick times by reading the counter on their interval * timer. Since these timers wrap every tick, they're not really * useful as clocksources. Wrapping them to act like one is possible * but not very efficient. So we provide a callout these arches * can implement for use with the jiffies clocksource to provide * finer then tick granular time. */ #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET extern u32 (*arch_gettimeoffset)(void); #endif extern void do_gettimeofday(struct timeval *tv); extern int do_settimeofday(const struct timespec *tv); extern int do_sys_settimeofday(const struct timespec *tv, const struct timezone *tz); #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); struct itimerval; extern int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue); extern unsigned int alarm_setitimer(unsigned int seconds); extern int do_getitimer(int which, struct itimerval *value); extern int __getnstimeofday(struct timespec *tv); extern void getnstimeofday(struct timespec *tv); extern void getrawmonotonic(struct timespec *ts); extern void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real); extern void getboottime(struct timespec *ts); extern void monotonic_to_bootbased(struct timespec *ts); extern void get_monotonic_boottime(struct timespec *ts); extern struct timespec timespec_trunc(struct timespec t, unsigned gran); extern int timekeeping_valid_for_hres(void); extern u64 timekeeping_max_deferment(void); extern int timekeeping_inject_offset(struct timespec *ts); extern s32 timekeeping_get_tai_offset(void); extern void timekeeping_set_tai_offset(s32 tai_offset); extern void timekeeping_clocktai(struct timespec *ts); struct tms; extern void do_sys_times(struct tms *); /* * Similar to the struct tm in userspace , but it needs to be here so * that the kernel source is self contained. */ struct tm { /* * the number of seconds after the minute, normally in the range * 0 to 59, but can be up to 60 to allow for leap seconds */ int tm_sec; /* the number of minutes after the hour, in the range 0 to 59*/ int tm_min; /* the number of hours past midnight, in the range 0 to 23 */ int tm_hour; /* the day of the month, in the range 1 to 31 */ int tm_mday; /* the number of months since January, in the range 0 to 11 */ int tm_mon; /* the number of years since 1900 */ long tm_year; /* the number of days since Sunday, in the range 0 to 6 */ int tm_wday; /* the number of days since January 1, in the range 0 to 365 */ int tm_yday; }; void time_to_tm(time_t totalsecs, int offset, struct tm *result); /** * timespec_to_ns - Convert timespec to nanoseconds * @ts: pointer to the timespec variable to be converted * * Returns the scalar nanosecond representation of the timespec * parameter. */ static inline s64 timespec_to_ns(const struct timespec *ts) { return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; } /** * timeval_to_ns - Convert timeval to nanoseconds * @ts: pointer to the timeval variable to be converted * * Returns the scalar nanosecond representation of the timeval * parameter. */ static inline s64 timeval_to_ns(const struct timeval *tv) { return ((s64) tv->tv_sec * NSEC_PER_SEC) + tv->tv_usec * NSEC_PER_USEC; } /** * ns_to_timespec - Convert nanoseconds to timespec * @nsec: the nanoseconds value to be converted * * Returns the timespec representation of the nsec parameter. */ extern struct timespec ns_to_timespec(const s64 nsec); /** * ns_to_timeval - Convert nanoseconds to timeval * @nsec: the nanoseconds value to be converted * * Returns the timeval representation of the nsec parameter. */ extern struct timeval ns_to_timeval(const s64 nsec); /** * timespec_add_ns - Adds nanoseconds to a timespec * @a: pointer to timespec to be incremented * @ns: unsigned nanoseconds value to be added * * This must always be inlined because its used from the x86-64 vdso, * which cannot call other kernel functions. */ static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) { a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); a->tv_nsec = ns; } #endif