1/*
2 *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
3 *  Copyright 2003 Andi Kleen, SuSE Labs.
4 *
5 *  Thanks to hpa@transmeta.com for some useful hint.
6 *  Special thanks to Ingo Molnar for his early experience with
7 *  a different vsyscall implementation for Linux/IA32 and for the name.
8 */
9
10#include <linux/time.h>
11#include <linux/timekeeper_internal.h>
12
13#include <asm/vvar.h>
14
15void update_vsyscall_tz(void)
16{
17	if (unlikely(vvar_data == NULL))
18		return;
19
20	vvar_data->tz_minuteswest = sys_tz.tz_minuteswest;
21	vvar_data->tz_dsttime = sys_tz.tz_dsttime;
22}
23
24void update_vsyscall(struct timekeeper *tk)
25{
26	struct vvar_data *vdata = vvar_data;
27
28	if (unlikely(vdata == NULL))
29		return;
30
31	vvar_write_begin(vdata);
32	vdata->vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode;
33	vdata->clock.cycle_last = tk->tkr_mono.cycle_last;
34	vdata->clock.mask = tk->tkr_mono.mask;
35	vdata->clock.mult = tk->tkr_mono.mult;
36	vdata->clock.shift = tk->tkr_mono.shift;
37
38	vdata->wall_time_sec = tk->xtime_sec;
39	vdata->wall_time_snsec = tk->tkr_mono.xtime_nsec;
40
41	vdata->monotonic_time_sec = tk->xtime_sec +
42				    tk->wall_to_monotonic.tv_sec;
43	vdata->monotonic_time_snsec = tk->tkr_mono.xtime_nsec +
44				      (tk->wall_to_monotonic.tv_nsec <<
45				       tk->tkr_mono.shift);
46
47	while (vdata->monotonic_time_snsec >=
48	       (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) {
49		vdata->monotonic_time_snsec -=
50				((u64)NSEC_PER_SEC) << tk->tkr_mono.shift;
51		vdata->monotonic_time_sec++;
52	}
53
54	vdata->wall_time_coarse_sec = tk->xtime_sec;
55	vdata->wall_time_coarse_nsec =
56			(long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
57
58	vdata->monotonic_time_coarse_sec =
59		vdata->wall_time_coarse_sec + tk->wall_to_monotonic.tv_sec;
60	vdata->monotonic_time_coarse_nsec =
61		vdata->wall_time_coarse_nsec + tk->wall_to_monotonic.tv_nsec;
62
63	while (vdata->monotonic_time_coarse_nsec >= NSEC_PER_SEC) {
64		vdata->monotonic_time_coarse_nsec -= NSEC_PER_SEC;
65		vdata->monotonic_time_coarse_sec++;
66	}
67
68	vvar_write_end(vdata);
69}
70