| /* |
| * 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> |
| |
| /** |
| * struct tk_read_base - base structure for timekeeping readout |
| * @clock: Current clocksource used for timekeeping. |
| * @read: Read function of @clock |
| * @mask: Bitmask for two's complement subtraction of non 64bit clocks |
| * @cycle_last: @clock cycle value at last update |
| * @mult: NTP adjusted multiplier for scaled math conversion |
| * @shift: Shift value for scaled math conversion |
| * @xtime_nsec: Shifted (fractional) nano seconds offset for readout |
| * @base_mono: ktime_t (nanoseconds) base time for readout |
| * |
| * This struct has size 56 byte on 64 bit. Together with a seqcount it |
| * occupies a single 64byte cache line. |
| * |
| * The struct is separate from struct timekeeper as it is also used |
| * for a fast NMI safe accessor to clock monotonic. |
| */ |
| struct tk_read_base { |
| struct clocksource *clock; |
| cycle_t (*read)(struct clocksource *cs); |
| cycle_t mask; |
| cycle_t cycle_last; |
| u32 mult; |
| u32 shift; |
| u64 xtime_nsec; |
| ktime_t base_mono; |
| }; |
| |
| /** |
| * struct timekeeper - Structure holding internal timekeeping values. |
| * @tkr: The readout base structure |
| * @xtime_sec: Current CLOCK_REALTIME time in seconds |
| * @wall_to_monotonic: CLOCK_REALTIME to CLOCK_MONOTONIC offset |
| * @offs_real: Offset clock monotonic -> clock realtime |
| * @offs_boot: Offset clock monotonic -> clock boottime |
| * @offs_tai: Offset clock monotonic -> clock tai |
| * @tai_offset: The current UTC to TAI offset in seconds |
| * @base_raw: Monotonic raw base time in ktime_t format |
| * @raw_time: Monotonic raw base time in timespec64 format |
| * @cycle_interval: Number of clock cycles in one NTP interval |
| * @xtime_interval: Number of clock shifted nano seconds in one NTP |
| * interval. |
| * @xtime_remainder: Shifted nano seconds left over when rounding |
| * @cycle_interval |
| * @raw_interval: Raw nano seconds accumulated per NTP interval. |
| * @ntp_error: Difference between accumulated time and NTP time in ntp |
| * shifted nano seconds. |
| * @ntp_error_shift: Shift conversion between clock shifted nano seconds and |
| * ntp shifted nano seconds. |
| * |
| * Note: For timespec(64) based interfaces 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. We need to add total_sleep_time to |
| * wall_to_monotonic to get the real boot based time offset. |
| * |
| * wall_to_monotonic is no longer the boot time, getboottime must be |
| * used instead. |
| */ |
| struct timekeeper { |
| struct tk_read_base tkr; |
| u64 xtime_sec; |
| struct timespec64 wall_to_monotonic; |
| ktime_t offs_real; |
| ktime_t offs_boot; |
| ktime_t offs_tai; |
| s32 tai_offset; |
| ktime_t base_raw; |
| struct timespec64 raw_time; |
| |
| /* The following members are for timekeeping internal use */ |
| cycle_t cycle_interval; |
| u64 xtime_interval; |
| s64 xtime_remainder; |
| u32 raw_interval; |
| /* The ntp_tick_length() value currently being used. |
| * This cached copy ensures we consistently apply the tick |
| * length for an entire tick, as ntp_tick_length may change |
| * mid-tick, and we don't want to apply that new value to |
| * the tick in progress. |
| */ |
| u64 ntp_tick; |
| /* Difference between accumulated time and NTP time in ntp |
| * shifted nano seconds. */ |
| s64 ntp_error; |
| u32 ntp_error_shift; |
| u32 ntp_err_mult; |
| }; |
| |
| #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 */ |