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 9 extern 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 22 static 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 */ 33 static 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 42 static 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 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 55 extern 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 */ 62 extern struct timespec timespec_add_safe(const struct timespec lhs, 63 const struct timespec rhs); 64 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 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 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 */ 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; 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; 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 } 117 118 extern void read_persistent_clock(struct timespec *ts); 119 extern void read_boot_clock(struct timespec *ts); 120 extern int update_persistent_clock(struct timespec now); 121 void timekeeping_init(void); 122 extern int timekeeping_suspended; 123 124 unsigned long get_seconds(void); 125 struct timespec current_kernel_time(void); 126 struct timespec __current_kernel_time(void); /* does not take xtime_lock */ 127 struct timespec get_monotonic_coarse(void); 128 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, 129 struct timespec *wtom, struct timespec *sleep); 130 void 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 145 extern u32 arch_gettimeoffset(void); 146 #else 147 static inline u32 arch_gettimeoffset(void) { return 0; } 148 #endif 149 150 extern void do_gettimeofday(struct timeval *tv); 151 extern int do_settimeofday(const struct timespec *tv); 152 extern 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) 155 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); 156 struct itimerval; 157 extern int do_setitimer(int which, struct itimerval *value, 158 struct itimerval *ovalue); 159 extern unsigned int alarm_setitimer(unsigned int seconds); 160 extern int do_getitimer(int which, struct itimerval *value); 161 extern void getnstimeofday(struct timespec *tv); 162 extern void getrawmonotonic(struct timespec *ts); 163 extern void getnstime_raw_and_real(struct timespec *ts_raw, 164 struct timespec *ts_real); 165 extern void getboottime(struct timespec *ts); 166 extern void monotonic_to_bootbased(struct timespec *ts); 167 extern void get_monotonic_boottime(struct timespec *ts); 168 169 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 170 extern int timekeeping_valid_for_hres(void); 171 extern u64 timekeeping_max_deferment(void); 172 extern int timekeeping_inject_offset(struct timespec *ts); 173 174 struct tms; 175 extern 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 */ 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); 204 205 /** 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 */ 212 static 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 */ 224 static 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 */ 236 extern 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 */ 244 extern 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 */ 254 static __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 261