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- /*
- * Copyright (C) 2001 Andrea Arcangeli <[email protected]> SuSE
- * Copyright 2003 Andi Kleen, SuSE Labs.
- *
- * Thanks to [email protected] 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/time.h>
- #include <linux/timekeeper_internal.h>
- #include <asm/vvar.h>
- void update_vsyscall_tz(void)
- {
- if (unlikely(vvar_data == NULL))
- return;
- vvar_data->tz_minuteswest = sys_tz.tz_minuteswest;
- vvar_data->tz_dsttime = sys_tz.tz_dsttime;
- }
- void update_vsyscall(struct timekeeper *tk)
- {
- struct vvar_data *vdata = vvar_data;
- if (unlikely(vdata == NULL))
- return;
- vvar_write_begin(vdata);
- vdata->vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode;
- vdata->clock.cycle_last = tk->tkr_mono.cycle_last;
- vdata->clock.mask = tk->tkr_mono.mask;
- vdata->clock.mult = tk->tkr_mono.mult;
- vdata->clock.shift = tk->tkr_mono.shift;
- vdata->wall_time_sec = tk->xtime_sec;
- vdata->wall_time_snsec = tk->tkr_mono.xtime_nsec;
- vdata->monotonic_time_sec = tk->xtime_sec +
- tk->wall_to_monotonic.tv_sec;
- vdata->monotonic_time_snsec = tk->tkr_mono.xtime_nsec +
- (tk->wall_to_monotonic.tv_nsec <<
- tk->tkr_mono.shift);
- while (vdata->monotonic_time_snsec >=
- (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) {
- vdata->monotonic_time_snsec -=
- ((u64)NSEC_PER_SEC) << tk->tkr_mono.shift;
- vdata->monotonic_time_sec++;
- }
- vdata->wall_time_coarse_sec = tk->xtime_sec;
- vdata->wall_time_coarse_nsec =
- (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
- vdata->monotonic_time_coarse_sec =
- vdata->wall_time_coarse_sec + tk->wall_to_monotonic.tv_sec;
- vdata->monotonic_time_coarse_nsec =
- vdata->wall_time_coarse_nsec + tk->wall_to_monotonic.tv_nsec;
- while (vdata->monotonic_time_coarse_nsec >= NSEC_PER_SEC) {
- vdata->monotonic_time_coarse_nsec -= NSEC_PER_SEC;
- vdata->monotonic_time_coarse_sec++;
- }
- vvar_write_end(vdata);
- }
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