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 /* Last cycle value (also stored in clock->cycle_last) */
24 cycle_t cycle_last;
25 /* Number of clock shifted nano seconds in one NTP interval. */
26 u64 xtime_interval;
27 /* shifted nano seconds left over when rounding cycle_interval */
28 s64 xtime_remainder;
29 /* Raw nano seconds accumulated per NTP interval. */
30 u32 raw_interval;
31
32 /* Current CLOCK_REALTIME time in seconds */
33 u64 xtime_sec;
34 /* Clock shifted nano seconds */
35 u64 xtime_nsec;
36
37 /* Difference between accumulated time and NTP time in ntp
38 * shifted nano seconds. */
39 s64 ntp_error;
40 /* Shift conversion between clock shifted nano seconds and
41 * ntp shifted nano seconds. */
42 u32 ntp_error_shift;
43
44 /*
45 * wall_to_monotonic is what we need to add to xtime (or xtime corrected
46 * for sub jiffie times) to get to monotonic time. Monotonic is pegged
47 * at zero at system boot time, so wall_to_monotonic will be negative,
48 * however, we will ALWAYS keep the tv_nsec part positive so we can use
49 * the usual normalization.
50 *
51 * wall_to_monotonic is moved after resume from suspend for the
52 * monotonic time not to jump. We need to add total_sleep_time to
53 * wall_to_monotonic to get the real boot based time offset.
54 *
55 * - wall_to_monotonic is no longer the boot time, getboottime must be
56 * used instead.
57 */
58 struct timespec wall_to_monotonic;
59 /* Offset clock monotonic -> clock realtime */
60 ktime_t offs_real;
61 /* time spent in suspend */
62 struct timespec total_sleep_time;
63 /* Offset clock monotonic -> clock boottime */
64 ktime_t offs_boot;
65 /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
66 struct timespec raw_time;
67 /* The current UTC to TAI offset in seconds */
68 s32 tai_offset;
69 /* Offset clock monotonic -> clock tai */
70 ktime_t offs_tai;
71
72 };
73
tk_xtime(struct timekeeper * tk)74 static inline struct timespec tk_xtime(struct timekeeper *tk)
75 {
76 struct timespec ts;
77
78 ts.tv_sec = tk->xtime_sec;
79 ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
80 return ts;
81 }
82
83
84 #ifdef CONFIG_GENERIC_TIME_VSYSCALL
85
86 extern void update_vsyscall(struct timekeeper *tk);
87 extern void update_vsyscall_tz(void);
88
89 #elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD)
90
91 extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm,
92 struct clocksource *c, u32 mult);
93 extern void update_vsyscall_tz(void);
94
update_vsyscall(struct timekeeper * tk)95 static inline void update_vsyscall(struct timekeeper *tk)
96 {
97 struct timespec xt;
98
99 xt = tk_xtime(tk);
100 update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
101 }
102
103 #else
104
update_vsyscall(struct timekeeper * tk)105 static inline void update_vsyscall(struct timekeeper *tk)
106 {
107 }
update_vsyscall_tz(void)108 static inline void update_vsyscall_tz(void)
109 {
110 }
111 #endif
112
113 #endif /* _LINUX_TIMEKEEPER_INTERNAL_H */
114