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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 | /* 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 |
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