* phase-lock loop variables
*/
/* TIME_ERROR prevents overwriting the CMOS clock */
-int time_state = TIME_OK; /* clock synchronization status */
+static int time_state = TIME_OK; /* clock synchronization status */
int time_status = STA_UNSYNC; /* clock status bits */
-long time_offset; /* time adjustment (ns) */
-long time_constant = 2; /* pll time constant */
-long time_precision = 1; /* clock precision (us) */
+static long 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) */
long time_freq; /* frequency offset (scaled ppm)*/
-long time_reftime; /* time at last adjustment (s) */
+static long time_reftime; /* time at last adjustment (s) */
long time_adjust;
+#define CLOCK_TICK_OVERFLOW (LATCH * HZ - CLOCK_TICK_RATE)
+#define CLOCK_TICK_ADJUST (((s64)CLOCK_TICK_OVERFLOW * NSEC_PER_SEC) / \
+ (s64)CLOCK_TICK_RATE)
+
+static void ntp_update_frequency(void)
+{
+ tick_length_base = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) << TICK_LENGTH_SHIFT;
+ tick_length_base += (s64)CLOCK_TICK_ADJUST << TICK_LENGTH_SHIFT;
+ tick_length_base += (s64)time_freq << (TICK_LENGTH_SHIFT - SHIFT_NSEC);
+
+ do_div(tick_length_base, HZ);
+
+ tick_nsec = tick_length_base >> TICK_LENGTH_SHIFT;
+}
+
/**
* ntp_clear - Clears the NTP state variables
*
time_offset = 0;
}
-#define CLOCK_TICK_OVERFLOW (LATCH * HZ - CLOCK_TICK_RATE)
-#define CLOCK_TICK_ADJUST (((s64)CLOCK_TICK_OVERFLOW * NSEC_PER_SEC) / (s64)CLOCK_TICK_RATE)
-
-void ntp_update_frequency(void)
-{
- tick_length_base = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) << TICK_LENGTH_SHIFT;
- tick_length_base += (s64)CLOCK_TICK_ADJUST << TICK_LENGTH_SHIFT;
- tick_length_base += (s64)time_freq << (TICK_LENGTH_SHIFT - SHIFT_NSEC);
-
- do_div(tick_length_base, HZ);
-
- tick_nsec = tick_length_base >> TICK_LENGTH_SHIFT;
-}
-
/*
* this routine handles the overflow of the microsecond field
*
}
/*
- * Compute the phase adjustment for the next second. In PLL mode, the
- * offset is reduced by a fixed factor times the time constant. In FLL
- * mode the offset is used directly. In either mode, the maximum phase
- * adjustment for each second is clamped so as to spread the adjustment
- * over not more than the number of seconds between updates.
+ * Compute the phase adjustment for the next second. The offset is
+ * reduced by a fixed factor times the time constant.
*/
tick_length = tick_length_base;
- time_adj = time_offset;
- if (!(time_status & STA_FLL))
- time_adj = shift_right(time_adj, SHIFT_KG + time_constant);
- time_adj = min(time_adj, -((MAXPHASE / HZ) << SHIFT_UPDATE) / MINSEC);
- time_adj = max(time_adj, ((MAXPHASE / HZ) << SHIFT_UPDATE) / MINSEC);
+ time_adj = shift_right(time_offset, SHIFT_PLL + time_constant);
time_offset -= time_adj;
tick_length += (s64)time_adj << (TICK_LENGTH_SHIFT - SHIFT_UPDATE);
time_adjust += MAX_TICKADJ;
tick_length -= MAX_TICKADJ_SCALED;
} else {
- time_adjust = 0;
tick_length += (s64)(time_adjust * NSEC_PER_USEC /
HZ) << TICK_LENGTH_SHIFT;
+ time_adjust = 0;
}
}
}
int do_adjtimex(struct timex *txc)
{
long ltemp, mtemp, save_adjust;
- s64 freq_adj;
+ s64 freq_adj, temp64;
int result;
/* In order to modify anything, you gotta be super-user! */
result = -EINVAL;
goto leave;
}
- time_constant = txc->constant;
+ time_constant = min(txc->constant + 4, (long)MAXTC);
}
if (txc->modes & ADJ_OFFSET) { /* values checked earlier */
time_reftime = xtime.tv_sec;
mtemp = xtime.tv_sec - time_reftime;
time_reftime = xtime.tv_sec;
- freq_adj = 0;
- if (time_status & STA_FLL) {
- if (mtemp >= MINSEC) {
- freq_adj = (s64)time_offset << (SHIFT_NSEC - SHIFT_KH);
- if (time_offset < 0) {
- freq_adj = -freq_adj;
- do_div(freq_adj, mtemp);
- freq_adj = -freq_adj;
- } else
- do_div(freq_adj, mtemp);
- } else /* calibration interval too short (p. 12) */
- result = TIME_ERROR;
- } else { /* PLL mode */
- if (mtemp < MAXSEC) {
- freq_adj = (s64)ltemp * mtemp;
- freq_adj = shift_right(freq_adj,(time_constant +
- time_constant +
- SHIFT_KF - SHIFT_NSEC));
- } else /* calibration interval too long (p. 12) */
- result = TIME_ERROR;
+
+ freq_adj = (s64)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);
+ if (time_offset < 0) {
+ temp64 = -temp64;
+ do_div(temp64, mtemp);
+ freq_adj -= temp64;
+ } else {
+ do_div(temp64, mtemp);
+ freq_adj += temp64;
+ }
}
freq_adj += time_freq;
freq_adj = min(freq_adj, (s64)MAXFREQ_NSEC);
txc->esterror = time_esterror;
txc->status = time_status;
txc->constant = time_constant;
- txc->precision = time_precision;
+ txc->precision = 1;
txc->tolerance = MAXFREQ;
txc->tick = tick_usec;
projects / linux-2.6 / blobdiff