/*
 *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
 *  Copyright 2003 Andi Kleen, SuSE Labs.
 *
 *  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/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);
}