diff options
| author | Roman Zippel <zippel@linux-m68k.org> | 2008-05-01 04:34:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-05-01 08:03:59 -0700 |
| commit | 153b5d054ac2d98ea0d86504884326b6777f683d (patch) | |
| tree | 0512b4239959814a6cc6aa6c9e77abc36d3ab2f0 /kernel/time | |
| parent | 9f14f669d18477fe3df071e2fa4da36c00acee8e (diff) | |
ntp: support for TAI
This adds support for setting the TAI value (International Atomic Time). The
value is reported back to userspace via timex (as we don't have a
ntp_gettime() syscall).
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/ntp.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 44491de312a0..10fe17df45a0 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -35,6 +35,7 @@ static u64 tick_length, tick_length_base; /* TIME_ERROR prevents overwriting the CMOS clock */ static int time_state = TIME_OK; /* clock synchronization status */ int time_status = STA_UNSYNC; /* clock status bits */ +static long time_tai; /* TAI offset (s) */ static s64 time_offset; /* time adjustment (ns) */ static long time_constant = 2; /* pll time constant */ long time_maxerror = NTP_PHASE_LIMIT; /* maximum error (us) */ @@ -162,6 +163,7 @@ void second_overflow(void) case TIME_DEL: if ((xtime.tv_sec + 1) % 86400 == 0) { xtime.tv_sec++; + time_tai--; wall_to_monotonic.tv_sec--; time_state = TIME_WAIT; printk(KERN_NOTICE "Clock: deleting leap second " @@ -169,6 +171,7 @@ void second_overflow(void) } break; case TIME_OOP: + time_tai++; time_state = TIME_WAIT; break; case TIME_WAIT: @@ -340,6 +343,9 @@ int do_adjtimex(struct timex *txc) time_constant = max(time_constant, 0l); } + if (txc->modes & ADJ_TAI && txc->constant > 0) + time_tai = txc->constant; + if (txc->modes & ADJ_OFFSET) { if (txc->modes == ADJ_OFFSET_SINGLESHOT) /* adjtime() is independent from ntp_adjtime() */ @@ -377,6 +383,7 @@ int do_adjtimex(struct timex *txc) txc->precision = 1; txc->tolerance = MAXFREQ_SCALED / PPM_SCALE; txc->tick = tick_usec; + txc->tai = time_tai; /* PPS is not implemented, so these are zero */ txc->ppsfreq = 0; |