1 /* 2 * You SHOULD NOT be including this unless you're vsyscall 3 * handling code or timekeeping internal code! 4 */ 5 6 #ifndef _LINUX_TIMEKEEPER_INTERNAL_H 7 #define _LINUX_TIMEKEEPER_INTERNAL_H 8 9 #include <linux/clocksource.h> 10 #include <linux/jiffies.h> 11 #include <linux/time.h> 12 13 /* Structure holding internal timekeeping values. */ 14 struct timekeeper { 15 /* Current clocksource used for timekeeping. */ 16 struct clocksource *clock; 17 /* NTP adjusted clock multiplier */ 18 u32 mult; 19 /* The shift value of the current clocksource. */ 20 u32 shift; 21 /* Number of clock cycles in one NTP interval. */ 22 cycle_t cycle_interval; 23 /* Number of clock shifted nano seconds in one NTP interval. */ 24 u64 xtime_interval; 25 /* shifted nano seconds left over when rounding cycle_interval */ 26 s64 xtime_remainder; 27 /* Raw nano seconds accumulated per NTP interval. */ 28 u32 raw_interval; 29 30 /* Current CLOCK_REALTIME time in seconds */ 31 u64 xtime_sec; 32 /* Clock shifted nano seconds */ 33 u64 xtime_nsec; 34 35 /* Difference between accumulated time and NTP time in ntp 36 * shifted nano seconds. */ 37 s64 ntp_error; 38 /* Shift conversion between clock shifted nano seconds and 39 * ntp shifted nano seconds. */ 40 u32 ntp_error_shift; 41 42 /* 43 * wall_to_monotonic is what we need to add to xtime (or xtime corrected 44 * for sub jiffie times) to get to monotonic time. Monotonic is pegged 45 * at zero at system boot time, so wall_to_monotonic will be negative, 46 * however, we will ALWAYS keep the tv_nsec part positive so we can use 47 * the usual normalization. 48 * 49 * wall_to_monotonic is moved after resume from suspend for the 50 * monotonic time not to jump. We need to add total_sleep_time to 51 * wall_to_monotonic to get the real boot based time offset. 52 * 53 * - wall_to_monotonic is no longer the boot time, getboottime must be 54 * used instead. 55 */ 56 struct timespec wall_to_monotonic; 57 /* Offset clock monotonic -> clock realtime */ 58 ktime_t offs_real; 59 /* time spent in suspend */ 60 struct timespec total_sleep_time; 61 /* Offset clock monotonic -> clock boottime */ 62 ktime_t offs_boot; 63 /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */ 64 struct timespec raw_time; 65 /* Seqlock for all timekeeper values */ 66 seqlock_t lock; 67 }; 68 69 static inline struct timespec tk_xtime(struct timekeeper *tk) 70 { 71 struct timespec ts; 72 73 ts.tv_sec = tk->xtime_sec; 74 ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift); 75 return ts; 76 } 77 78 79 #ifdef CONFIG_GENERIC_TIME_VSYSCALL 80 81 extern void update_vsyscall(struct timekeeper *tk); 82 extern void update_vsyscall_tz(void); 83 84 #elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD) 85 86 extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm, 87 struct clocksource *c, u32 mult); 88 extern void update_vsyscall_tz(void); 89 90 static inline void update_vsyscall(struct timekeeper *tk) 91 { 92 struct timespec xt; 93 94 xt = tk_xtime(tk); 95 update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult); 96 } 97 98 #else 99 100 static inline void update_vsyscall(struct timekeeper *tk) 101 { 102 } 103 static inline void update_vsyscall_tz(void) 104 { 105 } 106 #endif 107 108 #endif /* _LINUX_TIMEKEEPER_INTERNAL_H */ 109