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/*
* Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
* Copyright 2003 Andi Kleen, SuSE Labs.
*
* Modified for x86 32 bit architecture by
* Stefani Seibold <stefani@seibold.net>
*
* Thanks to hpa@transmeta.com for some useful hint.
* Special thanks to Ingo Molnar for his early experience with
* a different vsyscall implementation for Linux/IA32 and for the name.
*
*/
#include <linux/timekeeper_internal.h>
#include <asm/vgtod.h>
DEFINE_VVAR(struct vsyscall_gtod_data, vsyscall_gtod_data);
void update_vsyscall_tz(void)
{
vsyscall_gtod_data.sys_tz = sys_tz;
}
void update_vsyscall(struct timekeeper *tk)
{
struct vsyscall_gtod_data *vdata = &vsyscall_gtod_data;
write_seqcount_begin(&vdata->seq);
/* copy vsyscall data */
vdata->clock.vclock_mode = tk->clock->archdata.vclock_mode;
vdata->clock.cycle_last = tk->clock->cycle_last;
vdata->clock.mask = tk->clock->mask;
vdata->clock.mult = tk->mult;
vdata->clock.shift = tk->shift;
vdata->wall_time_sec = tk->xtime_sec;
vdata->wall_time_snsec = tk->xtime_nsec;
vdata->monotonic_time_sec = tk->xtime_sec
+ tk->wall_to_monotonic.tv_sec;
vdata->monotonic_time_snsec = tk->xtime_nsec
+ (tk->wall_to_monotonic.tv_nsec
<< tk->shift);
while (vdata->monotonic_time_snsec >=
(((u64)NSEC_PER_SEC) << tk->shift)) {
vdata->monotonic_time_snsec -=
((u64)NSEC_PER_SEC) << tk->shift;
vdata->monotonic_time_sec++;
}
vdata->wall_time_coarse.tv_sec = tk->xtime_sec;
vdata->wall_time_coarse.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
vdata->monotonic_time_coarse = timespec_add(vdata->wall_time_coarse,
tk->wall_to_monotonic);
write_seqcount_end(&vdata->seq);
}
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