projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | } |