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ntp: support for TAI

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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>
This commit is contained in:
Roman Zippel
2008-05-01 04:34:37 -07:00
committed by Linus Torvalds
parent 9f14f669d1
commit 153b5d054a
4 changed files with 15 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
kernel/compat.c
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@ -955,7 +955,8 @@ asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
__put_user(txc.jitcnt, &utp->jitcnt) ||
__put_user(txc.calcnt, &utp->calcnt) ||
__put_user(txc.errcnt, &utp->errcnt) ||
__put_user(txc.stbcnt, &utp->stbcnt))
__put_user(txc.stbcnt, &utp->stbcnt) ||
__put_user(txc.tai, &utp->tai))
ret = -EFAULT;
return ret;

7
kernel/time/ntp.c
View File

@ -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;