-
-int do_settimeofday(struct timespec *tv)
-{
- time_t wtm_sec, sec = tv->tv_sec;
- long wtm_nsec, nsec = tv->tv_nsec;
- unsigned long delta;
-
- if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
- return -EINVAL;
-
- write_seqlock_irq(&xtime_lock);
-
- /* This is revolting. We need to set "xtime" correctly. However, the
- * value in this location is the value at the most recent update of
- * wall time. Discover what correction gettimeofday() would have
- * made, and then undo it!
- */
-
- delta = CCOUNT_PER_JIFFY;
- delta += get_ccount() - get_linux_timer();
- nsec -= delta * NSEC_PER_CCOUNT;
-
- wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
- wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
-
- set_normalized_timespec(&xtime, sec, nsec);
- set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
-
- ntp_clear();
- write_sequnlock_irq(&xtime_lock);
- return 0;
-}
-
-EXPORT_SYMBOL(do_settimeofday);
-
-
-void do_gettimeofday(struct timeval *tv)
-{
- unsigned long flags;
- unsigned long volatile sec, usec, delta, seq;
-
- do {
- seq = read_seqbegin_irqsave(&xtime_lock, flags);
-
- sec = xtime.tv_sec;
- usec = (xtime.tv_nsec / NSEC_PER_USEC);
-
- delta = get_linux_timer() - get_ccount();
-
- } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
- usec += (((unsigned long) CCOUNT_PER_JIFFY - delta)
- * (unsigned long) NSEC_PER_CCOUNT) / NSEC_PER_USEC;
-
- for (; usec >= 1000000; sec++, usec -= 1000000)
- ;
-
- tv->tv_sec = sec;
- tv->tv_usec = usec;
-}
-
-EXPORT_SYMBOL(do_gettimeofday);
-