-/* TIME_ERROR prevents overwriting the CMOS clock */
-int time_state = TIME_OK; /* clock synchronization status */
-int time_status = STA_UNSYNC; /* clock status bits */
-long time_offset; /* time adjustment (us) */
-long time_constant = 2; /* pll time constant */
-long time_tolerance = MAXFREQ; /* frequency tolerance (ppm) */
-long time_precision = 1; /* clock precision (us) */
-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) */
-long time_adjust;
-long time_next_adjust;
+
+/*
+ * clock synchronization status
+ *
+ * (TIME_ERROR prevents overwriting the CMOS clock)
+ */
+static int time_state = TIME_OK;
+
+/* clock status bits: */
+int time_status = STA_UNSYNC;
+
+/* TAI offset (secs): */
+static long time_tai;
+
+/* time adjustment (nsecs): */
+static s64 time_offset;
+
+/* pll time constant: */
+static long time_constant = 2;
+
+/* maximum error (usecs): */
+long time_maxerror = NTP_PHASE_LIMIT;
+
+/* estimated error (usecs): */
+long time_esterror = NTP_PHASE_LIMIT;
+
+/* frequency offset (scaled nsecs/secs): */
+static s64 time_freq;
+
+/* time at last adjustment (secs): */
+static long time_reftime;
+
+long time_adjust;
+
+/* constant (boot-param configurable) NTP tick adjustment (upscaled) */
+static s64 ntp_tick_adj;
+
+/*
+ * NTP methods:
+ */
+
+/*
+ * Update (tick_length, tick_length_base, tick_nsec), based
+ * on (tick_usec, ntp_tick_adj, time_freq):
+ */
+static void ntp_update_frequency(void)
+{
+ u64 second_length;
+ u64 new_base;
+
+ second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
+ << NTP_SCALE_SHIFT;
+
+ second_length += ntp_tick_adj;
+ second_length += time_freq;
+
+ tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
+ new_base = div_u64(second_length, NTP_INTERVAL_FREQ);
+
+ /*
+ * Don't wait for the next second_overflow, apply
+ * the change to the tick length immediately:
+ */
+ tick_length += new_base - tick_length_base;
+ tick_length_base = new_base;
+}
+
+static inline s64 ntp_update_offset_fll(s64 offset64, long secs)
+{
+ time_status &= ~STA_MODE;
+
+ if (secs < MINSEC)
+ return 0;
+
+ if (!(time_status & STA_FLL) && (secs <= MAXSEC))
+ return 0;
+
+ time_status |= STA_MODE;
+
+ return div_s64(offset64 << (NTP_SCALE_SHIFT - SHIFT_FLL), secs);
+}
+
+static void ntp_update_offset(long offset)
+{
+ s64 freq_adj;
+ s64 offset64;
+ long secs;
+
+ if (!(time_status & STA_PLL))
+ return;
+
+ if (!(time_status & STA_NANO))
+ offset *= NSEC_PER_USEC;
+
+ /*
+ * Scale the phase adjustment and
+ * clamp to the operating range.
+ */
+ offset = min(offset, MAXPHASE);
+ offset = max(offset, -MAXPHASE);
+
+ /*
+ * Select how the frequency is to be controlled
+ * and in which mode (PLL or FLL).
+ */
+ secs = xtime.tv_sec - time_reftime;
+ if (unlikely(time_status & STA_FREQHOLD))
+ secs = 0;
+
+ time_reftime = xtime.tv_sec;
+
+ offset64 = offset;
+ freq_adj = (offset64 * secs) <<
+ (NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + time_constant));
+
+ freq_adj += ntp_update_offset_fll(offset64, secs);
+
+ freq_adj = min(freq_adj + time_freq, MAXFREQ_SCALED);
+
+ time_freq = max(freq_adj, -MAXFREQ_SCALED);
+
+ time_offset = div_s64(offset64 << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
+}