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/*
* You SHOULD NOT be including this unless you're vsyscall
* handling code or timekeeping internal code!
*/
#ifndef _LINUX_TIMEKEEPER_INTERNAL_H
#define _LINUX_TIMEKEEPER_INTERNAL_H
#include <linux/clocksource.h>
#include <linux/jiffies.h>
#include <linux/time.h>
/*
* Structure holding internal timekeeping values.
*
* Note: wall_to_monotonic is what we need to add to xtime (or xtime
* corrected for sub jiffie times) to get to monotonic time.
* Monotonic is pegged at zero at system boot time, so
* wall_to_monotonic will be negative, however, we will ALWAYS keep
* the tv_nsec part positive so we can use the usual normalization.
*
* wall_to_monotonic is moved after resume from suspend for the
* monotonic time not to jump. To calculate the real boot time offset
* we need to do offs_real - offs_boot.
*
* - wall_to_monotonic is no longer the boot time, getboottime must be
* used instead.
*/
struct timekeeper {
/* Current clocksource used for timekeeping. */
struct clocksource *clock;
/* Read function of @clock */
cycle_t (*read)(struct clocksource *cs);
/* Bitmask for two's complement subtraction of non 64bit counters */
cycle_t mask;
/* Last cycle value */
cycle_t cycle_last;
/* NTP adjusted clock multiplier */
u32 mult;
/* The shift value of the current clocksource. */
u32 shift;
/* Clock shifted nano seconds */
u64 xtime_nsec;
/* Monotonic base time */
ktime_t base_mono;
/* Current CLOCK_REALTIME time in seconds */
u64 xtime_sec;
/* CLOCK_REALTIME to CLOCK_MONOTONIC offset */
struct timespec64 wall_to_monotonic;
/* Offset clock monotonic -> clock realtime */
ktime_t offs_real;
/* Offset clock monotonic -> clock boottime */
ktime_t offs_boot;
/* Offset clock monotonic -> clock tai */
ktime_t offs_tai;
/* The current UTC to TAI offset in seconds */
s32 tai_offset;
/* Monotonic raw base time */
ktime_t base_raw;
/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
struct timespec64 raw_time;
/* Number of clock cycles in one NTP interval. */
cycle_t cycle_interval;
/* Number of clock shifted nano seconds in one NTP interval. */
u64 xtime_interval;
/* shifted nano seconds left over when rounding cycle_interval */
s64 xtime_remainder;
/* Raw nano seconds accumulated per NTP interval. */
u32 raw_interval;
/*
* Difference between accumulated time and NTP time in ntp
* shifted nano seconds.
*/
s64 ntp_error;
/*
* Shift conversion between clock shifted nano seconds and
* ntp shifted nano seconds.
*/
u32 ntp_error_shift;
};
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
extern void update_vsyscall(struct timekeeper *tk);
extern void update_vsyscall_tz(void);
#elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD)
extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm,
struct clocksource *c, u32 mult,
cycles_t cycle_last);
extern void update_vsyscall_tz(void);
#else
static inline void update_vsyscall(struct timekeeper *tk)
{
}
static inline void update_vsyscall_tz(void)
{
}
#endif
#endif /* _LINUX_TIMEKEEPER_INTERNAL_H */
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