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d2312e33 SS |
1 | /* |
2 | * Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE | |
3 | * Copyright 2003 Andi Kleen, SuSE Labs. | |
4 | * | |
5 | * Modified for x86 32 bit architecture by | |
6 | * Stefani Seibold <stefani@seibold.net> | |
7c03156f | 7 | * sponsored by Rohde & Schwarz GmbH & Co. KG Munich/Germany |
d2312e33 SS |
8 | * |
9 | * Thanks to hpa@transmeta.com for some useful hint. | |
10 | * Special thanks to Ingo Molnar for his early experience with | |
11 | * a different vsyscall implementation for Linux/IA32 and for the name. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/timekeeper_internal.h> | |
16 | #include <asm/vgtod.h> | |
7c03156f | 17 | #include <asm/vvar.h> |
d2312e33 SS |
18 | |
19 | DEFINE_VVAR(struct vsyscall_gtod_data, vsyscall_gtod_data); | |
20 | ||
21 | void update_vsyscall_tz(void) | |
22 | { | |
7c03156f SS |
23 | vsyscall_gtod_data.tz_minuteswest = sys_tz.tz_minuteswest; |
24 | vsyscall_gtod_data.tz_dsttime = sys_tz.tz_dsttime; | |
d2312e33 SS |
25 | } |
26 | ||
27 | void update_vsyscall(struct timekeeper *tk) | |
28 | { | |
29 | struct vsyscall_gtod_data *vdata = &vsyscall_gtod_data; | |
30 | ||
7c03156f | 31 | gtod_write_begin(vdata); |
d2312e33 SS |
32 | |
33 | /* copy vsyscall data */ | |
876e7881 PZ |
34 | vdata->vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode; |
35 | vdata->cycle_last = tk->tkr_mono.cycle_last; | |
36 | vdata->mask = tk->tkr_mono.mask; | |
37 | vdata->mult = tk->tkr_mono.mult; | |
38 | vdata->shift = tk->tkr_mono.shift; | |
d2312e33 SS |
39 | |
40 | vdata->wall_time_sec = tk->xtime_sec; | |
876e7881 | 41 | vdata->wall_time_snsec = tk->tkr_mono.xtime_nsec; |
d2312e33 SS |
42 | |
43 | vdata->monotonic_time_sec = tk->xtime_sec | |
44 | + tk->wall_to_monotonic.tv_sec; | |
876e7881 | 45 | vdata->monotonic_time_snsec = tk->tkr_mono.xtime_nsec |
28b92e09 | 46 | + ((u64)tk->wall_to_monotonic.tv_nsec |
876e7881 | 47 | << tk->tkr_mono.shift); |
d2312e33 | 48 | while (vdata->monotonic_time_snsec >= |
876e7881 | 49 | (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) { |
d2312e33 | 50 | vdata->monotonic_time_snsec -= |
876e7881 | 51 | ((u64)NSEC_PER_SEC) << tk->tkr_mono.shift; |
d2312e33 SS |
52 | vdata->monotonic_time_sec++; |
53 | } | |
54 | ||
7c03156f | 55 | vdata->wall_time_coarse_sec = tk->xtime_sec; |
876e7881 PZ |
56 | vdata->wall_time_coarse_nsec = (long)(tk->tkr_mono.xtime_nsec >> |
57 | tk->tkr_mono.shift); | |
d2312e33 | 58 | |
7c03156f SS |
59 | vdata->monotonic_time_coarse_sec = |
60 | vdata->wall_time_coarse_sec + tk->wall_to_monotonic.tv_sec; | |
61 | vdata->monotonic_time_coarse_nsec = | |
62 | vdata->wall_time_coarse_nsec + tk->wall_to_monotonic.tv_nsec; | |
d2312e33 | 63 | |
7c03156f SS |
64 | while (vdata->monotonic_time_coarse_nsec >= NSEC_PER_SEC) { |
65 | vdata->monotonic_time_coarse_nsec -= NSEC_PER_SEC; | |
66 | vdata->monotonic_time_coarse_sec++; | |
67 | } | |
68 | ||
69 | gtod_write_end(vdata); | |
d2312e33 | 70 | } |