#include <linux/mm.h>
#include <linux/time.h>
+#include <linux/timer.h>
#include <linux/timex.h>
-
+#include <linux/jiffies.h>
+#include <linux/hrtimer.h>
+#include <linux/capability.h>
#include <asm/div64.h>
#include <asm/timex.h>
/* 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_offset; /* time adjustment (ns) */
+static s64 time_offset; /* time adjustment (ns) */
static long time_constant = 2; /* pll time constant */
long time_maxerror = NTP_PHASE_LIMIT; /* maximum error (us) */
long time_esterror = NTP_PHASE_LIMIT; /* estimated error (us) */
if (xtime.tv_sec % 86400 == 0) {
xtime.tv_sec--;
wall_to_monotonic.tv_sec++;
- /*
- * The timer interpolator will make time change
- * gradually instead of an immediate jump by one second
- */
- time_interpolator_update(-NSEC_PER_SEC);
time_state = TIME_OOP;
- clock_was_set();
printk(KERN_NOTICE "Clock: inserting leap second "
"23:59:60 UTC\n");
}
if ((xtime.tv_sec + 1) % 86400 == 0) {
xtime.tv_sec++;
wall_to_monotonic.tv_sec--;
- /*
- * Use of time interpolator for a gradual change of
- * time
- */
- time_interpolator_update(NSEC_PER_SEC);
time_state = TIME_WAIT;
- clock_was_set();
printk(KERN_NOTICE "Clock: deleting leap second "
"23:59:59 UTC\n");
}
return tick_length;
}
+#ifdef CONFIG_GENERIC_CMOS_UPDATE
+
+/* Disable the cmos update - used by virtualization and embedded */
+int no_sync_cmos_clock __read_mostly;
+
+static void sync_cmos_clock(unsigned long dummy);
+
+static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+
+static void sync_cmos_clock(unsigned long dummy)
+{
+ struct timespec now, next;
+ int fail = 1;
+
+ /*
+ * If we have an externally synchronized Linux clock, then update
+ * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
+ * called as close as possible to 500 ms before the new second starts.
+ * This code is run on a timer. If the clock is set, that timer
+ * may not expire at the correct time. Thus, we adjust...
+ */
+ if (!ntp_synced())
+ /*
+ * Not synced, exit, do not restart a timer (if one is
+ * running, let it run out).
+ */
+ return;
+
+ getnstimeofday(&now);
+ if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2)
+ fail = update_persistent_clock(now);
+
+ next.tv_nsec = (NSEC_PER_SEC / 2) - now.tv_nsec;
+ if (next.tv_nsec <= 0)
+ next.tv_nsec += NSEC_PER_SEC;
+
+ if (!fail)
+ next.tv_sec = 659;
+ else
+ next.tv_sec = 0;
+
+ if (next.tv_nsec >= NSEC_PER_SEC) {
+ next.tv_sec++;
+ next.tv_nsec -= NSEC_PER_SEC;
+ }
+ mod_timer(&sync_cmos_timer, jiffies + timespec_to_jiffies(&next));
+}
-void __attribute__ ((weak)) notify_arch_cmos_timer(void)
+static void notify_cmos_timer(void)
{
- return;
+ if (!no_sync_cmos_clock)
+ mod_timer(&sync_cmos_timer, jiffies + 1);
}
+#else
+static inline void notify_cmos_timer(void) { }
+#endif
+
/* adjtimex mainly allows reading (and writing, if superuser) of
* kernel time-keeping variables. used by xntpd.
*/
int do_adjtimex(struct timex *txc)
{
- long ltemp, mtemp, save_adjust;
+ long mtemp, save_adjust, rem;
s64 freq_adj, temp64;
int result;
/* Now we validate the data before disabling interrupts */
- if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT)
+ if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT) {
/* singleshot must not be used with any other mode bits */
- if (txc->modes != ADJ_OFFSET_SINGLESHOT)
+ if (txc->modes != ADJ_OFFSET_SINGLESHOT &&
+ txc->modes != ADJ_OFFSET_SS_READ)
return -EINVAL;
+ }
if (txc->modes != ADJ_OFFSET_SINGLESHOT && (txc->modes & ADJ_OFFSET))
/* adjustment Offset limited to +- .512 seconds */
time_adjust = txc->offset;
}
else if (time_status & STA_PLL) {
- ltemp = txc->offset * NSEC_PER_USEC;
+ time_offset = txc->offset * NSEC_PER_USEC;
/*
* Scale the phase adjustment and
* clamp to the operating range.
*/
- time_offset = min(ltemp, MAXPHASE * NSEC_PER_USEC);
- time_offset = max(time_offset, -MAXPHASE * NSEC_PER_USEC);
+ time_offset = min(time_offset, (s64)MAXPHASE * NSEC_PER_USEC);
+ time_offset = max(time_offset, (s64)-MAXPHASE * NSEC_PER_USEC);
/*
* Select whether the frequency is to be controlled
mtemp = xtime.tv_sec - time_reftime;
time_reftime = xtime.tv_sec;
- freq_adj = (s64)time_offset * mtemp;
+ freq_adj = time_offset * mtemp;
freq_adj = shift_right(freq_adj, time_constant * 2 +
(SHIFT_PLL + 2) * 2 - SHIFT_NSEC);
if (mtemp >= MINSEC && (time_status & STA_FLL || mtemp > MAXSEC)) {
- temp64 = (s64)time_offset << (SHIFT_NSEC - SHIFT_FLL);
+ temp64 = time_offset << (SHIFT_NSEC - SHIFT_FLL);
if (time_offset < 0) {
temp64 = -temp64;
do_div(temp64, mtemp);
freq_adj += time_freq;
freq_adj = min(freq_adj, (s64)MAXFREQ_NSEC);
time_freq = max(freq_adj, (s64)-MAXFREQ_NSEC);
- time_offset = (time_offset / NTP_INTERVAL_FREQ)
- << SHIFT_UPDATE;
+ time_offset = div_long_long_rem_signed(time_offset,
+ NTP_INTERVAL_FREQ,
+ &rem);
+ time_offset <<= SHIFT_UPDATE;
} /* STA_PLL */
} /* txc->modes & ADJ_OFFSET */
if (txc->modes & ADJ_TICK)
leave: if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0)
result = TIME_ERROR;
- if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT)
- txc->offset = save_adjust;
+ if ((txc->modes == ADJ_OFFSET_SINGLESHOT) ||
+ (txc->modes == ADJ_OFFSET_SS_READ))
+ txc->offset = save_adjust;
else
- txc->offset = shift_right(time_offset, SHIFT_UPDATE)
- * NTP_INTERVAL_FREQ / 1000;
- txc->freq = (time_freq / NSEC_PER_USEC)
- << (SHIFT_USEC - SHIFT_NSEC);
+ txc->offset = ((long)shift_right(time_offset, SHIFT_UPDATE)) *
+ NTP_INTERVAL_FREQ / 1000;
+ txc->freq = (time_freq / NSEC_PER_USEC) <<
+ (SHIFT_USEC - SHIFT_NSEC);
txc->maxerror = time_maxerror;
txc->esterror = time_esterror;
txc->status = time_status;
txc->stbcnt = 0;
write_sequnlock_irq(&xtime_lock);
do_gettimeofday(&txc->time);
- notify_arch_cmos_timer();
+ notify_cmos_timer();
return(result);
}
projects / linux-2.6 / blobdiff