include/linux/timekeeping.h

   1 #ifndef _LINUX_TIMEKEEPING_H
   2 #define _LINUX_TIMEKEEPING_H
   3
   4 /* Included from linux/ktime.h */
   5
   6 void timekeeping_init(void);
   7 extern int timekeeping_suspended;
   8
   9 /*
  10  * Get and set timeofday
  11  */
  12 extern void do_gettimeofday(struct timeval *tv);
  13 extern int do_settimeofday(const struct timespec *tv);
  14 extern int do_sys_settimeofday(const struct timespec *tv,
  15                                const struct timezone *tz);
  16
  17 /*
  18  * Kernel time accessors
  19  */
  20 unsigned long get_seconds(void);
  21 struct timespec current_kernel_time(void);
  22 /* does not take xtime_lock */
  23 struct timespec __current_kernel_time(void);
  24
  25 /*
  26  * timespec based interfaces
  27  */
  28 struct timespec get_monotonic_coarse(void);
  29 extern void getrawmonotonic(struct timespec *ts);
  30 extern void monotonic_to_bootbased(struct timespec *ts);
  31 extern void get_monotonic_boottime(struct timespec *ts);
  32 extern void ktime_get_ts64(struct timespec64 *ts);
  33
  34 extern int __getnstimeofday64(struct timespec64 *tv);
  35 extern void getnstimeofday64(struct timespec64 *tv);
  36
  37 #if BITS_PER_LONG == 64
  38 static inline int __getnstimeofday(struct timespec *ts)
  39 {
  40         return __getnstimeofday64(ts);
  41 }
  42
  43 static inline void getnstimeofday(struct timespec *ts)
  44 {
  45         getnstimeofday64(ts);
  46 }
  47
  48 static inline void ktime_get_ts(struct timespec *ts)
  49 {
  50         ktime_get_ts64(ts);
  51 }
  52
  53 static inline void ktime_get_real_ts(struct timespec *ts)
  54 {
  55         getnstimeofday64(ts);
  56 }
  57
  58 #else
  59 static inline int __getnstimeofday(struct timespec *ts)
  60 {
  61         struct timespec64 ts64;
  62         int ret = __getnstimeofday64(&ts64);
  63
  64         *ts = timespec64_to_timespec(ts64);
  65         return ret;
  66 }
  67
  68 static inline void getnstimeofday(struct timespec *ts)
  69 {
  70         struct timespec64 ts64;
  71
  72         getnstimeofday64(&ts64);
  73         *ts = timespec64_to_timespec(ts64);
  74 }
  75
  76 static inline void ktime_get_ts(struct timespec *ts)
  77 {
  78         struct timespec64 ts64;
  79
  80         ktime_get_ts64(&ts64);
  81         *ts = timespec64_to_timespec(ts64);
  82 }
  83
  84 static inline void ktime_get_real_ts(struct timespec *ts)
  85 {
  86         struct timespec64 ts64;
  87
  88         getnstimeofday64(&ts64);
  89         *ts = timespec64_to_timespec(ts64);
  90 }
  91 #endif
  92
  93 extern void getboottime(struct timespec *ts);
  94
  95 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
  96 #define ktime_get_real_ts64(ts) getnstimeofday64(ts)
  97
  98 /*
  99  * ktime_t based interfaces
 100  */
 101
 102 enum tk_offsets {
 103         TK_OFFS_REAL,
 104         TK_OFFS_BOOT,
 105         TK_OFFS_TAI,
 106         TK_OFFS_MAX,
 107 };
 108
 109 extern ktime_t ktime_get(void);
 110 extern ktime_t ktime_get_with_offset(enum tk_offsets offs);
 111 extern ktime_t ktime_get_monotonic_offset(void);
 112 extern ktime_t ktime_get_clocktai(void);
 113
 114 /**
 115  * ktime_get_real - get the real (wall-) time in ktime_t format
 116  */
 117 static inline ktime_t ktime_get_real(void)
 118 {
 119         return ktime_get_with_offset(TK_OFFS_REAL);
 120 }
 121
 122 /**
 123  * ktime_get_boottime - Returns monotonic time since boot in ktime_t format
 124  *
 125  * This is similar to CLOCK_MONTONIC/ktime_get, but also includes the
 126  * time spent in suspend.
 127  */
 128 static inline ktime_t ktime_get_boottime(void)
 129 {
 130         return ktime_get_with_offset(TK_OFFS_BOOT);
 131 }
 132
 133 /*
 134  * RTC specific
 135  */
 136 extern void timekeeping_inject_sleeptime(struct timespec *delta);
 137
 138 /*
 139  * PPS accessor
 140  */
 141 extern void getnstime_raw_and_real(struct timespec *ts_raw,
 142                                    struct timespec *ts_real);
 143
 144 /*
 145  * Persistent clock related interfaces
 146  */
 147 extern bool persistent_clock_exist;
 148 extern int persistent_clock_is_local;
 149
 150 static inline bool has_persistent_clock(void)
 151 {
 152         return persistent_clock_exist;
 153 }
 154
 155 extern void read_persistent_clock(struct timespec *ts);
 156 extern void read_boot_clock(struct timespec *ts);
 157 extern int update_persistent_clock(struct timespec now);
 158
 159
 160 #endif