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 14struct timespec { 15 __kernel_time_t tv_sec; /* seconds */ 16 long tv_nsec; /* nanoseconds */ 17}; 18#endif 19 20struct timeval { 21 __kernel_time_t tv_sec; /* seconds */ 22 __kernel_suseconds_t tv_usec; /* microseconds */ 23}; 24 25struct timezone { 26 int tz_minuteswest; /* minutes west of Greenwich */ 27 int tz_dsttime; /* type of dst correction */ 28}; 29 30#ifdef __KERNEL__ 31 32extern 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 45static 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 */ 56static 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 65static 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 74extern 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 78extern 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 */ 85extern struct timespec timespec_add_safe(const struct timespec lhs, 86 const struct timespec rhs); 87 88 89static 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 */ 101static 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/* 111 * Returns true if the timespec is norm, false if denorm: 112 */ 113#define timespec_valid(ts) \ 114 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 115 116extern seqlock_t xtime_lock; 117 118extern void read_persistent_clock(struct timespec *ts); 119extern void read_boot_clock(struct timespec *ts); 120extern int update_persistent_clock(struct timespec now); 121extern int no_sync_cmos_clock __read_mostly; 122void timekeeping_init(void); 123extern int timekeeping_suspended; 124 125unsigned long get_seconds(void); 126struct timespec current_kernel_time(void); 127struct timespec __current_kernel_time(void); /* does not take xtime_lock */ 128struct timespec __get_wall_to_monotonic(void); /* does not take xtime_lock */ 129struct timespec get_monotonic_coarse(void); 130 131#define CURRENT_TIME (current_kernel_time()) 132#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 133 134/* Some architectures do not supply their own clocksource. 135 * This is mainly the case in architectures that get their 136 * inter-tick times by reading the counter on their interval 137 * timer. Since these timers wrap every tick, they're not really 138 * useful as clocksources. Wrapping them to act like one is possible 139 * but not very efficient. So we provide a callout these arches 140 * can implement for use with the jiffies clocksource to provide 141 * finer then tick granular time. 142 */ 143#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 144extern u32 arch_gettimeoffset(void); 145#else 146static inline u32 arch_gettimeoffset(void) { return 0; } 147#endif 148 149extern void do_gettimeofday(struct timeval *tv); 150extern int do_settimeofday(struct timespec *tv); 151extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 152#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 153extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); 154struct itimerval; 155extern int do_setitimer(int which, struct itimerval *value, 156 struct itimerval *ovalue); 157extern unsigned int alarm_setitimer(unsigned int seconds); 158extern int do_getitimer(int which, struct itimerval *value); 159extern void getnstimeofday(struct timespec *tv); 160extern void getrawmonotonic(struct timespec *ts); 161extern void getboottime(struct timespec *ts); 162extern void monotonic_to_bootbased(struct timespec *ts); 163 164extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 165extern int timekeeping_valid_for_hres(void); 166extern u64 timekeeping_max_deferment(void); 167extern void update_wall_time(void); 168extern void timekeeping_leap_insert(int leapsecond); 169 170struct tms; 171extern void do_sys_times(struct tms *); 172 173/* 174 * Similar to the struct tm in userspace <time.h>, but it needs to be here so 175 * that the kernel source is self contained. 176 */ 177struct tm { 178 /* 179 * the number of seconds after the minute, normally in the range 180 * 0 to 59, but can be up to 60 to allow for leap seconds 181 */ 182 int tm_sec; 183 /* the number of minutes after the hour, in the range 0 to 59*/ 184 int tm_min; 185 /* the number of hours past midnight, in the range 0 to 23 */ 186 int tm_hour; 187 /* the day of the month, in the range 1 to 31 */ 188 int tm_mday; 189 /* the number of months since January, in the range 0 to 11 */ 190 int tm_mon; 191 /* the number of years since 1900 */ 192 long tm_year; 193 /* the number of days since Sunday, in the range 0 to 6 */ 194 int tm_wday; 195 /* the number of days since January 1, in the range 0 to 365 */ 196 int tm_yday; 197}; 198 199void time_to_tm(time_t totalsecs, int offset, struct tm *result); 200 201/** 202 * timespec_to_ns - Convert timespec to nanoseconds 203 * @ts: pointer to the timespec variable to be converted 204 * 205 * Returns the scalar nanosecond representation of the timespec 206 * parameter. 207 */ 208static inline s64 timespec_to_ns(const struct timespec *ts) 209{ 210 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 211} 212 213/** 214 * timeval_to_ns - Convert timeval to nanoseconds 215 * @ts: pointer to the timeval variable to be converted 216 * 217 * Returns the scalar nanosecond representation of the timeval 218 * parameter. 219 */ 220static inline s64 timeval_to_ns(const struct timeval *tv) 221{ 222 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 223 tv->tv_usec * NSEC_PER_USEC; 224} 225 226/** 227 * ns_to_timespec - Convert nanoseconds to timespec 228 * @nsec: the nanoseconds value to be converted 229 * 230 * Returns the timespec representation of the nsec parameter. 231 */ 232extern struct timespec ns_to_timespec(const s64 nsec); 233 234/** 235 * ns_to_timeval - Convert nanoseconds to timeval 236 * @nsec: the nanoseconds value to be converted 237 * 238 * Returns the timeval representation of the nsec parameter. 239 */ 240extern struct timeval ns_to_timeval(const s64 nsec); 241 242/** 243 * timespec_add_ns - Adds nanoseconds to a timespec 244 * @a: pointer to timespec to be incremented 245 * @ns: unsigned nanoseconds value to be added 246 * 247 * This must always be inlined because its used from the x86-64 vdso, 248 * which cannot call other kernel functions. 249 */ 250static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 251{ 252 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 253 a->tv_nsec = ns; 254} 255#endif /* __KERNEL__ */ 256 257#define NFDBITS __NFDBITS 258 259#define FD_SETSIZE __FD_SETSIZE 260#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 261#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 262#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 263#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 264 265/* 266 * Names of the interval timers, and structure 267 * defining a timer setting: 268 */ 269#define ITIMER_REAL 0 270#define ITIMER_VIRTUAL 1 271#define ITIMER_PROF 2 272 273struct itimerspec { 274 struct timespec it_interval; /* timer period */ 275 struct timespec it_value; /* timer expiration */ 276}; 277 278struct itimerval { 279 struct timeval it_interval; /* timer interval */ 280 struct timeval it_value; /* current value */ 281}; 282 283/* 284 * The IDs of the various system clocks (for POSIX.1b interval timers): 285 */ 286#define CLOCK_REALTIME 0 287#define CLOCK_MONOTONIC 1 288#define CLOCK_PROCESS_CPUTIME_ID 2 289#define CLOCK_THREAD_CPUTIME_ID 3 290#define CLOCK_MONOTONIC_RAW 4 291#define CLOCK_REALTIME_COARSE 5 292#define CLOCK_MONOTONIC_COARSE 6 293 294/* 295 * The IDs of various hardware clocks: 296 */ 297#define CLOCK_SGI_CYCLE 10 298#define MAX_CLOCKS 16 299#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 300#define CLOCKS_MONO CLOCK_MONOTONIC 301 302/* 303 * The various flags for setting POSIX.1b interval timers: 304 */ 305#define TIMER_ABSTIME 0x01 306 307#endif 308