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Commit | Line | Data |
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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 | /* | |
14 | * Structure holding internal timekeeping values. | |
15 | * | |
16 | * Note: wall_to_monotonic is what we need to add to xtime (or xtime | |
17 | * corrected for sub jiffie times) to get to monotonic time. | |
18 | * Monotonic is pegged at zero at system boot time, so | |
19 | * wall_to_monotonic will be negative, however, we will ALWAYS keep | |
20 | * the tv_nsec part positive so we can use the usual normalization. | |
21 | * | |
22 | * wall_to_monotonic is moved after resume from suspend for the | |
23 | * monotonic time not to jump. To calculate the real boot time offset | |
24 | * we need to do offs_real - offs_boot. | |
25 | * | |
26 | * - wall_to_monotonic is no longer the boot time, getboottime must be | |
27 | * used instead. | |
28 | */ | |
29 | struct timekeeper { | |
30 | /* Current clocksource used for timekeeping. */ | |
31 | struct clocksource *clock; | |
32 | /* NTP adjusted clock multiplier */ | |
33 | u32 mult; | |
34 | /* The shift value of the current clocksource. */ | |
35 | u32 shift; | |
36 | /* Clock shifted nano seconds */ | |
37 | u64 xtime_nsec; | |
38 | ||
39 | /* Monotonic base time */ | |
40 | ktime_t base_mono; | |
41 | ||
42 | /* Current CLOCK_REALTIME time in seconds */ | |
43 | u64 xtime_sec; | |
44 | /* CLOCK_REALTIME to CLOCK_MONOTONIC offset */ | |
45 | struct timespec64 wall_to_monotonic; | |
46 | ||
47 | /* Offset clock monotonic -> clock realtime */ | |
48 | ktime_t offs_real; | |
49 | /* Offset clock monotonic -> clock boottime */ | |
50 | ktime_t offs_boot; | |
51 | /* Offset clock monotonic -> clock tai */ | |
52 | ktime_t offs_tai; | |
53 | ||
54 | /* The current UTC to TAI offset in seconds */ | |
55 | s32 tai_offset; | |
56 | ||
57 | /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */ | |
58 | struct timespec64 raw_time; | |
59 | ||
60 | /* Number of clock cycles in one NTP interval. */ | |
61 | cycle_t cycle_interval; | |
62 | /* Last cycle value (also stored in clock->cycle_last) */ | |
63 | cycle_t cycle_last; | |
64 | /* Number of clock shifted nano seconds in one NTP interval. */ | |
65 | u64 xtime_interval; | |
66 | /* shifted nano seconds left over when rounding cycle_interval */ | |
67 | s64 xtime_remainder; | |
68 | /* Raw nano seconds accumulated per NTP interval. */ | |
69 | u32 raw_interval; | |
70 | ||
71 | /* | |
72 | * Difference between accumulated time and NTP time in ntp | |
73 | * shifted nano seconds. | |
74 | */ | |
75 | s64 ntp_error; | |
76 | /* | |
77 | * Shift conversion between clock shifted nano seconds and | |
78 | * ntp shifted nano seconds. | |
79 | */ | |
80 | u32 ntp_error_shift; | |
81 | }; | |
82 | ||
83 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL | |
84 | ||
85 | extern void update_vsyscall(struct timekeeper *tk); | |
86 | extern void update_vsyscall_tz(void); | |
87 | ||
88 | #elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD) | |
89 | ||
90 | extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm, | |
91 | struct clocksource *c, u32 mult); | |
92 | extern void update_vsyscall_tz(void); | |
93 | ||
94 | #else | |
95 | ||
96 | static inline void update_vsyscall(struct timekeeper *tk) | |
97 | { | |
98 | } | |
99 | static inline void update_vsyscall_tz(void) | |
100 | { | |
101 | } | |
102 | #endif | |
103 | ||
104 | #endif /* _LINUX_TIMEKEEPER_INTERNAL_H */ |