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 bool persistent_clock_exist; 119 120 #ifdef ALWAYS_USE_PERSISTENT_CLOCK 121 #define has_persistent_clock() true 122 #else 123 static inline bool has_persistent_clock(void) 124 { 125 return persistent_clock_exist; 126 } 127 #endif 128 129 extern void read_persistent_clock(struct timespec *ts); 130 extern void read_boot_clock(struct timespec *ts); 131 extern int persistent_clock_is_local; 132 extern int update_persistent_clock(struct timespec now); 133 void timekeeping_init(void); 134 extern int timekeeping_suspended; 135 136 unsigned long get_seconds(void); 137 struct timespec current_kernel_time(void); 138 struct timespec __current_kernel_time(void); /* does not take xtime_lock */ 139 struct timespec get_monotonic_coarse(void); 140 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, 141 struct timespec *wtom, struct timespec *sleep); 142 void timekeeping_inject_sleeptime(struct timespec *delta); 143 144 #define CURRENT_TIME (current_kernel_time()) 145 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 146 147 /* Some architectures do not supply their own clocksource. 148 * This is mainly the case in architectures that get their 149 * inter-tick times by reading the counter on their interval 150 * timer. Since these timers wrap every tick, they're not really 151 * useful as clocksources. Wrapping them to act like one is possible 152 * but not very efficient. So we provide a callout these arches 153 * can implement for use with the jiffies clocksource to provide 154 * finer then tick granular time. 155 */ 156 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 157 extern u32 (*arch_gettimeoffset)(void); 158 #endif 159 160 extern void do_gettimeofday(struct timeval *tv); 161 extern int do_settimeofday(const struct timespec *tv); 162 extern int do_sys_settimeofday(const struct timespec *tv, 163 const struct timezone *tz); 164 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 165 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); 166 struct itimerval; 167 extern int do_setitimer(int which, struct itimerval *value, 168 struct itimerval *ovalue); 169 extern unsigned int alarm_setitimer(unsigned int seconds); 170 extern int do_getitimer(int which, struct itimerval *value); 171 extern int __getnstimeofday(struct timespec *tv); 172 extern void getnstimeofday(struct timespec *tv); 173 extern void getrawmonotonic(struct timespec *ts); 174 extern void getnstime_raw_and_real(struct timespec *ts_raw, 175 struct timespec *ts_real); 176 extern void getboottime(struct timespec *ts); 177 extern void monotonic_to_bootbased(struct timespec *ts); 178 extern void get_monotonic_boottime(struct timespec *ts); 179 180 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 181 extern int timekeeping_valid_for_hres(void); 182 extern u64 timekeeping_max_deferment(void); 183 extern int timekeeping_inject_offset(struct timespec *ts); 184 extern s32 timekeeping_get_tai_offset(void); 185 extern void timekeeping_set_tai_offset(s32 tai_offset); 186 extern void timekeeping_clocktai(struct timespec *ts); 187 188 struct tms; 189 extern void do_sys_times(struct tms *); 190 191 /* 192 * Similar to the struct tm in userspace <time.h>, but it needs to be here so 193 * that the kernel source is self contained. 194 */ 195 struct tm { 196 /* 197 * the number of seconds after the minute, normally in the range 198 * 0 to 59, but can be up to 60 to allow for leap seconds 199 */ 200 int tm_sec; 201 /* the number of minutes after the hour, in the range 0 to 59*/ 202 int tm_min; 203 /* the number of hours past midnight, in the range 0 to 23 */ 204 int tm_hour; 205 /* the day of the month, in the range 1 to 31 */ 206 int tm_mday; 207 /* the number of months since January, in the range 0 to 11 */ 208 int tm_mon; 209 /* the number of years since 1900 */ 210 long tm_year; 211 /* the number of days since Sunday, in the range 0 to 6 */ 212 int tm_wday; 213 /* the number of days since January 1, in the range 0 to 365 */ 214 int tm_yday; 215 }; 216 217 void time_to_tm(time_t totalsecs, int offset, struct tm *result); 218 219 /** 220 * timespec_to_ns - Convert timespec to nanoseconds 221 * @ts: pointer to the timespec variable to be converted 222 * 223 * Returns the scalar nanosecond representation of the timespec 224 * parameter. 225 */ 226 static inline s64 timespec_to_ns(const struct timespec *ts) 227 { 228 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 229 } 230 231 /** 232 * timeval_to_ns - Convert timeval to nanoseconds 233 * @ts: pointer to the timeval variable to be converted 234 * 235 * Returns the scalar nanosecond representation of the timeval 236 * parameter. 237 */ 238 static inline s64 timeval_to_ns(const struct timeval *tv) 239 { 240 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 241 tv->tv_usec * NSEC_PER_USEC; 242 } 243 244 /** 245 * ns_to_timespec - Convert nanoseconds to timespec 246 * @nsec: the nanoseconds value to be converted 247 * 248 * Returns the timespec representation of the nsec parameter. 249 */ 250 extern struct timespec ns_to_timespec(const s64 nsec); 251 252 /** 253 * ns_to_timeval - Convert nanoseconds to timeval 254 * @nsec: the nanoseconds value to be converted 255 * 256 * Returns the timeval representation of the nsec parameter. 257 */ 258 extern struct timeval ns_to_timeval(const s64 nsec); 259 260 /** 261 * timespec_add_ns - Adds nanoseconds to a timespec 262 * @a: pointer to timespec to be incremented 263 * @ns: unsigned nanoseconds value to be added 264 * 265 * This must always be inlined because its used from the x86-64 vdso, 266 * which cannot call other kernel functions. 267 */ 268 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 269 { 270 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 271 a->tv_nsec = ns; 272 } 273 274 #endif 275