1248 lines
37 KiB
C
1248 lines
37 KiB
C
/* $NetBSD: kern_ntptime.c,v 1.41 2006/11/01 10:17:58 yamt Exp $ */
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#include <sys/types.h> /* XXX to get __HAVE_TIMECOUNTER, remove
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after all ports are converted. */
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#ifdef __HAVE_TIMECOUNTER
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/*-
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***********************************************************************
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* *
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* Copyright (c) David L. Mills 1993-2001 *
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* *
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* Permission to use, copy, modify, and distribute this software and *
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* its documentation for any purpose and without fee is hereby *
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* granted, provided that the above copyright notice appears in all *
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* copies and that both the copyright notice and this permission *
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* notice appear in supporting documentation, and that the name *
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* University of Delaware not be used in advertising or publicity *
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* pertaining to distribution of the software without specific, *
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* written prior permission. The University of Delaware makes no *
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* representations about the suitability this software for any *
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* purpose. It is provided "as is" without express or implied *
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* warranty. *
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* *
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**********************************************************************/
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/*
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* Adapted from the original sources for FreeBSD and timecounters by:
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* Poul-Henning Kamp <phk@FreeBSD.org>.
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*
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* The 32bit version of the "LP" macros seems a bit past its "sell by"
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* date so I have retained only the 64bit version and included it directly
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* in this file.
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*
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* Only minor changes done to interface with the timecounters over in
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* sys/kern/kern_clock.c. Some of the comments below may be (even more)
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* confusing and/or plain wrong in that context.
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*/
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#include <sys/cdefs.h>
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/* __FBSDID("$FreeBSD: src/sys/kern/kern_ntptime.c,v 1.59 2005/05/28 14:34:41 rwatson Exp $"); */
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__KERNEL_RCSID(0, "$NetBSD: kern_ntptime.c,v 1.41 2006/11/01 10:17:58 yamt Exp $");
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#include "opt_ntp.h"
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#include "opt_compat_netbsd.h"
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#include <sys/param.h>
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#include <sys/resourcevar.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <sys/timex.h>
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#ifdef COMPAT_30
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#include <compat/sys/timex.h>
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#endif
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#include <sys/vnode.h>
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#include <sys/kauth.h>
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#include <sys/mount.h>
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#include <sys/sa.h>
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#include <sys/syscallargs.h>
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#include <machine/cpu.h>
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/*
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* Single-precision macros for 64-bit machines
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*/
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typedef int64_t l_fp;
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#define L_ADD(v, u) ((v) += (u))
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#define L_SUB(v, u) ((v) -= (u))
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#define L_ADDHI(v, a) ((v) += (int64_t)(a) << 32)
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#define L_NEG(v) ((v) = -(v))
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#define L_RSHIFT(v, n) \
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do { \
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if ((v) < 0) \
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(v) = -(-(v) >> (n)); \
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else \
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(v) = (v) >> (n); \
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} while (0)
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#define L_MPY(v, a) ((v) *= (a))
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#define L_CLR(v) ((v) = 0)
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#define L_ISNEG(v) ((v) < 0)
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#define L_LINT(v, a) ((v) = (int64_t)(a) << 32)
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#define L_GINT(v) ((v) < 0 ? -(-(v) >> 32) : (v) >> 32)
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#ifdef NTP
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/*
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* Generic NTP kernel interface
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*
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* These routines constitute the Network Time Protocol (NTP) interfaces
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* for user and daemon application programs. The ntp_gettime() routine
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* provides the time, maximum error (synch distance) and estimated error
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* (dispersion) to client user application programs. The ntp_adjtime()
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* routine is used by the NTP daemon to adjust the system clock to an
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* externally derived time. The time offset and related variables set by
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* this routine are used by other routines in this module to adjust the
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* phase and frequency of the clock discipline loop which controls the
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* system clock.
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*
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* When the kernel time is reckoned directly in nanoseconds (NTP_NANO
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* defined), the time at each tick interrupt is derived directly from
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* the kernel time variable. When the kernel time is reckoned in
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* microseconds, (NTP_NANO undefined), the time is derived from the
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* kernel time variable together with a variable representing the
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* leftover nanoseconds at the last tick interrupt. In either case, the
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* current nanosecond time is reckoned from these values plus an
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* interpolated value derived by the clock routines in another
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* architecture-specific module. The interpolation can use either a
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* dedicated counter or a processor cycle counter (PCC) implemented in
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* some architectures.
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*
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* Note that all routines must run at priority splclock or higher.
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*/
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/*
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* Phase/frequency-lock loop (PLL/FLL) definitions
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*
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* The nanosecond clock discipline uses two variable types, time
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* variables and frequency variables. Both types are represented as 64-
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* bit fixed-point quantities with the decimal point between two 32-bit
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* halves. On a 32-bit machine, each half is represented as a single
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* word and mathematical operations are done using multiple-precision
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* arithmetic. On a 64-bit machine, ordinary computer arithmetic is
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* used.
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*
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* A time variable is a signed 64-bit fixed-point number in ns and
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* fraction. It represents the remaining time offset to be amortized
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* over succeeding tick interrupts. The maximum time offset is about
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* 0.5 s and the resolution is about 2.3e-10 ns.
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*
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* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |s s s| ns |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | fraction |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* A frequency variable is a signed 64-bit fixed-point number in ns/s
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* and fraction. It represents the ns and fraction to be added to the
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* kernel time variable at each second. The maximum frequency offset is
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* about +-500000 ns/s and the resolution is about 2.3e-10 ns/s.
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*
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* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |s s s s s s s s s s s s s| ns/s |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | fraction |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/*
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* The following variables establish the state of the PLL/FLL and the
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* residual time and frequency offset of the local clock.
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*/
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#define SHIFT_PLL 4 /* PLL loop gain (shift) */
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#define SHIFT_FLL 2 /* FLL loop gain (shift) */
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static int time_state = TIME_OK; /* clock state */
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static int time_status = STA_UNSYNC; /* clock status bits */
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static long time_tai; /* TAI offset (s) */
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static long time_monitor; /* last time offset scaled (ns) */
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static long time_constant; /* poll interval (shift) (s) */
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static long time_precision = 1; /* clock precision (ns) */
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static long time_maxerror = MAXPHASE / 1000; /* maximum error (us) */
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static long time_esterror = MAXPHASE / 1000; /* estimated error (us) */
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static long time_reftime; /* time at last adjustment (s) */
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static l_fp time_offset; /* time offset (ns) */
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static l_fp time_freq; /* frequency offset (ns/s) */
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#endif /* NTP */
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static l_fp time_adj; /* tick adjust (ns/s) */
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int64_t time_adjtime; /* correction from adjtime(2) (usec) */
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extern int time_adjusted; /* ntp might have changed the system time */
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#ifdef NTP
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#ifdef PPS_SYNC
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/*
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* The following variables are used when a pulse-per-second (PPS) signal
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* is available and connected via a modem control lead. They establish
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* the engineering parameters of the clock discipline loop when
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* controlled by the PPS signal.
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*/
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#define PPS_FAVG 2 /* min freq avg interval (s) (shift) */
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#define PPS_FAVGDEF 8 /* default freq avg int (s) (shift) */
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#define PPS_FAVGMAX 15 /* max freq avg interval (s) (shift) */
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#define PPS_PAVG 4 /* phase avg interval (s) (shift) */
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#define PPS_VALID 120 /* PPS signal watchdog max (s) */
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#define PPS_MAXWANDER 100000 /* max PPS wander (ns/s) */
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#define PPS_POPCORN 2 /* popcorn spike threshold (shift) */
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static struct timespec pps_tf[3]; /* phase median filter */
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static l_fp pps_freq; /* scaled frequency offset (ns/s) */
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static long pps_fcount; /* frequency accumulator */
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static long pps_jitter; /* nominal jitter (ns) */
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static long pps_stabil; /* nominal stability (scaled ns/s) */
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static long pps_lastsec; /* time at last calibration (s) */
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static int pps_valid; /* signal watchdog counter */
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static int pps_shift = PPS_FAVG; /* interval duration (s) (shift) */
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static int pps_shiftmax = PPS_FAVGDEF; /* max interval duration (s) (shift) */
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static int pps_intcnt; /* wander counter */
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/*
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* PPS signal quality monitors
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*/
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static long pps_calcnt; /* calibration intervals */
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static long pps_jitcnt; /* jitter limit exceeded */
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static long pps_stbcnt; /* stability limit exceeded */
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static long pps_errcnt; /* calibration errors */
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#endif /* PPS_SYNC */
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/*
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* End of phase/frequency-lock loop (PLL/FLL) definitions
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*/
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static void hardupdate(long offset);
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/*
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* ntp_gettime() - NTP user application interface
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*/
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void
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ntp_gettime(ntv)
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struct ntptimeval *ntv;
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{
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nanotime(&ntv->time);
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ntv->maxerror = time_maxerror;
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ntv->esterror = time_esterror;
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ntv->tai = time_tai;
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ntv->time_state = time_state;
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}
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/* ARGSUSED */
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/*
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* ntp_adjtime() - NTP daemon application interface
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*/
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int
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sys_ntp_adjtime(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct sys_ntp_adjtime_args /* {
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syscallarg(struct timex *) tp;
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} */ *uap = v;
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struct timex ntv;
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int error = 0;
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error = copyin((caddr_t)SCARG(uap, tp), (caddr_t)&ntv, sizeof(ntv));
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if (error != 0)
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return (error);
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if (ntv.modes != 0 && (error = kauth_authorize_system(l->l_cred,
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KAUTH_SYSTEM_TIME, KAUTH_REQ_SYSTEM_TIME_NTPADJTIME, NULL,
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NULL, NULL)) != 0)
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return (error);
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ntp_adjtime1(&ntv);
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error = copyout((caddr_t)&ntv, (caddr_t)SCARG(uap, tp), sizeof(ntv));
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if (!error)
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*retval = ntp_timestatus();
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return error;
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}
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void
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ntp_adjtime1(ntv)
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struct timex *ntv;
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{
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long freq;
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int modes;
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int s;
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/*
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* Update selected clock variables - only the superuser can
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* change anything. Note that there is no error checking here on
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* the assumption the superuser should know what it is doing.
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* Note that either the time constant or TAI offset are loaded
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* from the ntv.constant member, depending on the mode bits. If
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* the STA_PLL bit in the status word is cleared, the state and
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* status words are reset to the initial values at boot.
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*/
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modes = ntv->modes;
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if (modes != 0)
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/* We need to save the system time during shutdown */
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time_adjusted |= 2;
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s = splclock();
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if (modes & MOD_MAXERROR)
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time_maxerror = ntv->maxerror;
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if (modes & MOD_ESTERROR)
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time_esterror = ntv->esterror;
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if (modes & MOD_STATUS) {
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if (time_status & STA_PLL && !(ntv->status & STA_PLL)) {
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time_state = TIME_OK;
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time_status = STA_UNSYNC;
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#ifdef PPS_SYNC
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pps_shift = PPS_FAVG;
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#endif /* PPS_SYNC */
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}
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time_status &= STA_RONLY;
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time_status |= ntv->status & ~STA_RONLY;
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}
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if (modes & MOD_TIMECONST) {
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if (ntv->constant < 0)
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time_constant = 0;
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else if (ntv->constant > MAXTC)
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time_constant = MAXTC;
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else
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time_constant = ntv->constant;
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}
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if (modes & MOD_TAI) {
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if (ntv->constant > 0) /* XXX zero & negative numbers ? */
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time_tai = ntv->constant;
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}
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#ifdef PPS_SYNC
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if (modes & MOD_PPSMAX) {
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if (ntv->shift < PPS_FAVG)
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pps_shiftmax = PPS_FAVG;
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else if (ntv->shift > PPS_FAVGMAX)
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pps_shiftmax = PPS_FAVGMAX;
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else
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pps_shiftmax = ntv->shift;
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}
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#endif /* PPS_SYNC */
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if (modes & MOD_NANO)
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time_status |= STA_NANO;
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if (modes & MOD_MICRO)
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time_status &= ~STA_NANO;
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if (modes & MOD_CLKB)
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time_status |= STA_CLK;
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if (modes & MOD_CLKA)
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time_status &= ~STA_CLK;
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if (modes & MOD_FREQUENCY) {
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freq = (ntv->freq * 1000LL) >> 16;
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if (freq > MAXFREQ)
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L_LINT(time_freq, MAXFREQ);
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else if (freq < -MAXFREQ)
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L_LINT(time_freq, -MAXFREQ);
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else {
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/*
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* ntv.freq is [PPM * 2^16] = [us/s * 2^16]
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* time_freq is [ns/s * 2^32]
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*/
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time_freq = ntv->freq * 1000LL * 65536LL;
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}
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#ifdef PPS_SYNC
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pps_freq = time_freq;
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#endif /* PPS_SYNC */
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}
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if (modes & MOD_OFFSET) {
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if (time_status & STA_NANO)
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hardupdate(ntv->offset);
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else
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hardupdate(ntv->offset * 1000);
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}
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/*
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* Retrieve all clock variables. Note that the TAI offset is
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* returned only by ntp_gettime();
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*/
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if (time_status & STA_NANO)
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ntv->offset = L_GINT(time_offset);
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else
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ntv->offset = L_GINT(time_offset) / 1000; /* XXX rounding ? */
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ntv->freq = L_GINT((time_freq / 1000LL) << 16);
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ntv->maxerror = time_maxerror;
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ntv->esterror = time_esterror;
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ntv->status = time_status;
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ntv->constant = time_constant;
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if (time_status & STA_NANO)
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ntv->precision = time_precision;
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else
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ntv->precision = time_precision / 1000;
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ntv->tolerance = MAXFREQ * SCALE_PPM;
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#ifdef PPS_SYNC
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ntv->shift = pps_shift;
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ntv->ppsfreq = L_GINT((pps_freq / 1000LL) << 16);
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if (time_status & STA_NANO)
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ntv->jitter = pps_jitter;
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else
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ntv->jitter = pps_jitter / 1000;
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ntv->stabil = pps_stabil;
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ntv->calcnt = pps_calcnt;
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ntv->errcnt = pps_errcnt;
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ntv->jitcnt = pps_jitcnt;
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ntv->stbcnt = pps_stbcnt;
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#endif /* PPS_SYNC */
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splx(s);
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}
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#endif /* NTP */
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/*
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* second_overflow() - called after ntp_tick_adjust()
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*
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* This routine is ordinarily called immediately following the above
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* routine ntp_tick_adjust(). While these two routines are normally
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* combined, they are separated here only for the purposes of
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* simulation.
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*/
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void
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ntp_update_second(int64_t *adjustment, time_t *newsec)
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{
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int tickrate;
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l_fp ftemp; /* 32/64-bit temporary */
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#ifdef NTP
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/*
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* On rollover of the second both the nanosecond and microsecond
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* clocks are updated and the state machine cranked as
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* necessary. The phase adjustment to be used for the next
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* second is calculated and the maximum error is increased by
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* the tolerance.
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*/
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time_maxerror += MAXFREQ / 1000;
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/*
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* Leap second processing. If in leap-insert state at
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* the end of the day, the system clock is set back one
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* second; if in leap-delete state, the system clock is
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* set ahead one second. The nano_time() routine or
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* external clock driver will insure that reported time
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* is always monotonic.
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*/
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switch (time_state) {
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/*
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* No warning.
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*/
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case TIME_OK:
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if (time_status & STA_INS)
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time_state = TIME_INS;
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else if (time_status & STA_DEL)
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time_state = TIME_DEL;
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break;
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/*
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* Insert second 23:59:60 following second
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* 23:59:59.
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*/
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case TIME_INS:
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if (!(time_status & STA_INS))
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time_state = TIME_OK;
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else if ((*newsec) % 86400 == 0) {
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(*newsec)--;
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time_state = TIME_OOP;
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time_tai++;
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}
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break;
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/*
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* Delete second 23:59:59.
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*/
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case TIME_DEL:
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if (!(time_status & STA_DEL))
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time_state = TIME_OK;
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else if (((*newsec) + 1) % 86400 == 0) {
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(*newsec)++;
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time_tai--;
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time_state = TIME_WAIT;
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}
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break;
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/*
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* Insert second in progress.
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*/
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case TIME_OOP:
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time_state = TIME_WAIT;
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break;
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/*
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* Wait for status bits to clear.
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|
*/
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case TIME_WAIT:
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if (!(time_status & (STA_INS | STA_DEL)))
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time_state = TIME_OK;
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}
|
|
|
|
/*
|
|
* Compute the total time adjustment for the next second
|
|
* in ns. The offset is reduced by a factor depending on
|
|
* whether the PPS signal is operating. Note that the
|
|
* value is in effect scaled by the clock frequency,
|
|
* since the adjustment is added at each tick interrupt.
|
|
*/
|
|
ftemp = time_offset;
|
|
#ifdef PPS_SYNC
|
|
/* XXX even if PPS signal dies we should finish adjustment ? */
|
|
if (time_status & STA_PPSTIME && time_status &
|
|
STA_PPSSIGNAL)
|
|
L_RSHIFT(ftemp, pps_shift);
|
|
else
|
|
L_RSHIFT(ftemp, SHIFT_PLL + time_constant);
|
|
#else
|
|
L_RSHIFT(ftemp, SHIFT_PLL + time_constant);
|
|
#endif /* PPS_SYNC */
|
|
time_adj = ftemp;
|
|
L_SUB(time_offset, ftemp);
|
|
L_ADD(time_adj, time_freq);
|
|
|
|
#ifdef PPS_SYNC
|
|
if (pps_valid > 0)
|
|
pps_valid--;
|
|
else
|
|
time_status &= ~STA_PPSSIGNAL;
|
|
#endif /* PPS_SYNC */
|
|
#else /* !NTP */
|
|
L_CLR(time_adj);
|
|
#endif /* !NTP */
|
|
|
|
/*
|
|
* Apply any correction from adjtime(2). If more than one second
|
|
* off we slew at a rate of 5ms/s (5000 PPM) else 500us/s (500PPM)
|
|
* until the last second is slewed the final < 500 usecs.
|
|
*/
|
|
if (time_adjtime != 0) {
|
|
if (time_adjtime > 1000000)
|
|
tickrate = 5000;
|
|
else if (time_adjtime < -1000000)
|
|
tickrate = -5000;
|
|
else if (time_adjtime > 500)
|
|
tickrate = 500;
|
|
else if (time_adjtime < -500)
|
|
tickrate = -500;
|
|
else
|
|
tickrate = time_adjtime;
|
|
time_adjtime -= tickrate;
|
|
L_LINT(ftemp, tickrate * 1000);
|
|
L_ADD(time_adj, ftemp);
|
|
}
|
|
*adjustment = time_adj;
|
|
}
|
|
|
|
/*
|
|
* ntp_init() - initialize variables and structures
|
|
*
|
|
* This routine must be called after the kernel variables hz and tick
|
|
* are set or changed and before the next tick interrupt. In this
|
|
* particular implementation, these values are assumed set elsewhere in
|
|
* the kernel. The design allows the clock frequency and tick interval
|
|
* to be changed while the system is running. So, this routine should
|
|
* probably be integrated with the code that does that.
|
|
*/
|
|
void
|
|
ntp_init(void)
|
|
{
|
|
|
|
/*
|
|
* The following variables are initialized only at startup. Only
|
|
* those structures not cleared by the compiler need to be
|
|
* initialized, and these only in the simulator. In the actual
|
|
* kernel, any nonzero values here will quickly evaporate.
|
|
*/
|
|
L_CLR(time_adj);
|
|
#ifdef NTP
|
|
L_CLR(time_offset);
|
|
L_CLR(time_freq);
|
|
#ifdef PPS_SYNC
|
|
pps_tf[0].tv_sec = pps_tf[0].tv_nsec = 0;
|
|
pps_tf[1].tv_sec = pps_tf[1].tv_nsec = 0;
|
|
pps_tf[2].tv_sec = pps_tf[2].tv_nsec = 0;
|
|
pps_fcount = 0;
|
|
L_CLR(pps_freq);
|
|
#endif /* PPS_SYNC */
|
|
#endif
|
|
}
|
|
|
|
#ifdef NTP
|
|
/*
|
|
* hardupdate() - local clock update
|
|
*
|
|
* This routine is called by ntp_adjtime() to update the local clock
|
|
* phase and frequency. The implementation is of an adaptive-parameter,
|
|
* hybrid phase/frequency-lock loop (PLL/FLL). The routine computes new
|
|
* time and frequency offset estimates for each call. If the kernel PPS
|
|
* discipline code is configured (PPS_SYNC), the PPS signal itself
|
|
* determines the new time offset, instead of the calling argument.
|
|
* Presumably, calls to ntp_adjtime() occur only when the caller
|
|
* believes the local clock is valid within some bound (+-128 ms with
|
|
* NTP). If the caller's time is far different than the PPS time, an
|
|
* argument will ensue, and it's not clear who will lose.
|
|
*
|
|
* For uncompensated quartz crystal oscillators and nominal update
|
|
* intervals less than 256 s, operation should be in phase-lock mode,
|
|
* where the loop is disciplined to phase. For update intervals greater
|
|
* than 1024 s, operation should be in frequency-lock mode, where the
|
|
* loop is disciplined to frequency. Between 256 s and 1024 s, the mode
|
|
* is selected by the STA_MODE status bit.
|
|
*
|
|
* Note: splclock() is in effect.
|
|
*/
|
|
void
|
|
hardupdate(long offset)
|
|
{
|
|
long mtemp;
|
|
l_fp ftemp;
|
|
|
|
/*
|
|
* Select how the phase is to be controlled and from which
|
|
* source. If the PPS signal is present and enabled to
|
|
* discipline the time, the PPS offset is used; otherwise, the
|
|
* argument offset is used.
|
|
*/
|
|
if (!(time_status & STA_PLL))
|
|
return;
|
|
if (!(time_status & STA_PPSTIME && time_status &
|
|
STA_PPSSIGNAL)) {
|
|
if (offset > MAXPHASE)
|
|
time_monitor = MAXPHASE;
|
|
else if (offset < -MAXPHASE)
|
|
time_monitor = -MAXPHASE;
|
|
else
|
|
time_monitor = offset;
|
|
L_LINT(time_offset, time_monitor);
|
|
}
|
|
|
|
/*
|
|
* Select how the frequency is to be controlled and in which
|
|
* mode (PLL or FLL). If the PPS signal is present and enabled
|
|
* to discipline the frequency, the PPS frequency is used;
|
|
* otherwise, the argument offset is used to compute it.
|
|
*/
|
|
if (time_status & STA_PPSFREQ && time_status & STA_PPSSIGNAL) {
|
|
time_reftime = time_second;
|
|
return;
|
|
}
|
|
if (time_status & STA_FREQHOLD || time_reftime == 0)
|
|
time_reftime = time_second;
|
|
mtemp = time_second - time_reftime;
|
|
L_LINT(ftemp, time_monitor);
|
|
L_RSHIFT(ftemp, (SHIFT_PLL + 2 + time_constant) << 1);
|
|
L_MPY(ftemp, mtemp);
|
|
L_ADD(time_freq, ftemp);
|
|
time_status &= ~STA_MODE;
|
|
if (mtemp >= MINSEC && (time_status & STA_FLL || mtemp >
|
|
MAXSEC)) {
|
|
L_LINT(ftemp, (time_monitor << 4) / mtemp);
|
|
L_RSHIFT(ftemp, SHIFT_FLL + 4);
|
|
L_ADD(time_freq, ftemp);
|
|
time_status |= STA_MODE;
|
|
}
|
|
time_reftime = time_second;
|
|
if (L_GINT(time_freq) > MAXFREQ)
|
|
L_LINT(time_freq, MAXFREQ);
|
|
else if (L_GINT(time_freq) < -MAXFREQ)
|
|
L_LINT(time_freq, -MAXFREQ);
|
|
}
|
|
|
|
#ifdef PPS_SYNC
|
|
/*
|
|
* hardpps() - discipline CPU clock oscillator to external PPS signal
|
|
*
|
|
* This routine is called at each PPS interrupt in order to discipline
|
|
* the CPU clock oscillator to the PPS signal. It measures the PPS phase
|
|
* and leaves it in a handy spot for the hardclock() routine. It
|
|
* integrates successive PPS phase differences and calculates the
|
|
* frequency offset. This is used in hardclock() to discipline the CPU
|
|
* clock oscillator so that intrinsic frequency error is cancelled out.
|
|
* The code requires the caller to capture the time and hardware counter
|
|
* value at the on-time PPS signal transition.
|
|
*
|
|
* Note that, on some Unix systems, this routine runs at an interrupt
|
|
* priority level higher than the timer interrupt routine hardclock().
|
|
* Therefore, the variables used are distinct from the hardclock()
|
|
* variables, except for certain exceptions: The PPS frequency pps_freq
|
|
* and phase pps_offset variables are determined by this routine and
|
|
* updated atomically. The time_tolerance variable can be considered a
|
|
* constant, since it is infrequently changed, and then only when the
|
|
* PPS signal is disabled. The watchdog counter pps_valid is updated
|
|
* once per second by hardclock() and is atomically cleared in this
|
|
* routine.
|
|
*/
|
|
void
|
|
hardpps(struct timespec *tsp, /* time at PPS */
|
|
long nsec /* hardware counter at PPS */)
|
|
{
|
|
long u_sec, u_nsec, v_nsec; /* temps */
|
|
l_fp ftemp;
|
|
|
|
/*
|
|
* The signal is first processed by a range gate and frequency
|
|
* discriminator. The range gate rejects noise spikes outside
|
|
* the range +-500 us. The frequency discriminator rejects input
|
|
* signals with apparent frequency outside the range 1 +-500
|
|
* PPM. If two hits occur in the same second, we ignore the
|
|
* later hit; if not and a hit occurs outside the range gate,
|
|
* keep the later hit for later comparison, but do not process
|
|
* it.
|
|
*/
|
|
time_status |= STA_PPSSIGNAL | STA_PPSJITTER;
|
|
time_status &= ~(STA_PPSWANDER | STA_PPSERROR);
|
|
pps_valid = PPS_VALID;
|
|
u_sec = tsp->tv_sec;
|
|
u_nsec = tsp->tv_nsec;
|
|
if (u_nsec >= (NANOSECOND >> 1)) {
|
|
u_nsec -= NANOSECOND;
|
|
u_sec++;
|
|
}
|
|
v_nsec = u_nsec - pps_tf[0].tv_nsec;
|
|
if (u_sec == pps_tf[0].tv_sec && v_nsec < NANOSECOND -
|
|
MAXFREQ)
|
|
return;
|
|
pps_tf[2] = pps_tf[1];
|
|
pps_tf[1] = pps_tf[0];
|
|
pps_tf[0].tv_sec = u_sec;
|
|
pps_tf[0].tv_nsec = u_nsec;
|
|
|
|
/*
|
|
* Compute the difference between the current and previous
|
|
* counter values. If the difference exceeds 0.5 s, assume it
|
|
* has wrapped around, so correct 1.0 s. If the result exceeds
|
|
* the tick interval, the sample point has crossed a tick
|
|
* boundary during the last second, so correct the tick. Very
|
|
* intricate.
|
|
*/
|
|
u_nsec = nsec;
|
|
if (u_nsec > (NANOSECOND >> 1))
|
|
u_nsec -= NANOSECOND;
|
|
else if (u_nsec < -(NANOSECOND >> 1))
|
|
u_nsec += NANOSECOND;
|
|
pps_fcount += u_nsec;
|
|
if (v_nsec > MAXFREQ || v_nsec < -MAXFREQ)
|
|
return;
|
|
time_status &= ~STA_PPSJITTER;
|
|
|
|
/*
|
|
* A three-stage median filter is used to help denoise the PPS
|
|
* time. The median sample becomes the time offset estimate; the
|
|
* difference between the other two samples becomes the time
|
|
* dispersion (jitter) estimate.
|
|
*/
|
|
if (pps_tf[0].tv_nsec > pps_tf[1].tv_nsec) {
|
|
if (pps_tf[1].tv_nsec > pps_tf[2].tv_nsec) {
|
|
v_nsec = pps_tf[1].tv_nsec; /* 0 1 2 */
|
|
u_nsec = pps_tf[0].tv_nsec - pps_tf[2].tv_nsec;
|
|
} else if (pps_tf[2].tv_nsec > pps_tf[0].tv_nsec) {
|
|
v_nsec = pps_tf[0].tv_nsec; /* 2 0 1 */
|
|
u_nsec = pps_tf[2].tv_nsec - pps_tf[1].tv_nsec;
|
|
} else {
|
|
v_nsec = pps_tf[2].tv_nsec; /* 0 2 1 */
|
|
u_nsec = pps_tf[0].tv_nsec - pps_tf[1].tv_nsec;
|
|
}
|
|
} else {
|
|
if (pps_tf[1].tv_nsec < pps_tf[2].tv_nsec) {
|
|
v_nsec = pps_tf[1].tv_nsec; /* 2 1 0 */
|
|
u_nsec = pps_tf[2].tv_nsec - pps_tf[0].tv_nsec;
|
|
} else if (pps_tf[2].tv_nsec < pps_tf[0].tv_nsec) {
|
|
v_nsec = pps_tf[0].tv_nsec; /* 1 0 2 */
|
|
u_nsec = pps_tf[1].tv_nsec - pps_tf[2].tv_nsec;
|
|
} else {
|
|
v_nsec = pps_tf[2].tv_nsec; /* 1 2 0 */
|
|
u_nsec = pps_tf[1].tv_nsec - pps_tf[0].tv_nsec;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Nominal jitter is due to PPS signal noise and interrupt
|
|
* latency. If it exceeds the popcorn threshold, the sample is
|
|
* discarded. otherwise, if so enabled, the time offset is
|
|
* updated. We can tolerate a modest loss of data here without
|
|
* much degrading time accuracy.
|
|
*/
|
|
if (u_nsec > (pps_jitter << PPS_POPCORN)) {
|
|
time_status |= STA_PPSJITTER;
|
|
pps_jitcnt++;
|
|
} else if (time_status & STA_PPSTIME) {
|
|
time_monitor = -v_nsec;
|
|
L_LINT(time_offset, time_monitor);
|
|
}
|
|
pps_jitter += (u_nsec - pps_jitter) >> PPS_FAVG;
|
|
u_sec = pps_tf[0].tv_sec - pps_lastsec;
|
|
if (u_sec < (1 << pps_shift))
|
|
return;
|
|
|
|
/*
|
|
* At the end of the calibration interval the difference between
|
|
* the first and last counter values becomes the scaled
|
|
* frequency. It will later be divided by the length of the
|
|
* interval to determine the frequency update. If the frequency
|
|
* exceeds a sanity threshold, or if the actual calibration
|
|
* interval is not equal to the expected length, the data are
|
|
* discarded. We can tolerate a modest loss of data here without
|
|
* much degrading frequency accuracy.
|
|
*/
|
|
pps_calcnt++;
|
|
v_nsec = -pps_fcount;
|
|
pps_lastsec = pps_tf[0].tv_sec;
|
|
pps_fcount = 0;
|
|
u_nsec = MAXFREQ << pps_shift;
|
|
if (v_nsec > u_nsec || v_nsec < -u_nsec || u_sec != (1 <<
|
|
pps_shift)) {
|
|
time_status |= STA_PPSERROR;
|
|
pps_errcnt++;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Here the raw frequency offset and wander (stability) is
|
|
* calculated. If the wander is less than the wander threshold
|
|
* for four consecutive averaging intervals, the interval is
|
|
* doubled; if it is greater than the threshold for four
|
|
* consecutive intervals, the interval is halved. The scaled
|
|
* frequency offset is converted to frequency offset. The
|
|
* stability metric is calculated as the average of recent
|
|
* frequency changes, but is used only for performance
|
|
* monitoring.
|
|
*/
|
|
L_LINT(ftemp, v_nsec);
|
|
L_RSHIFT(ftemp, pps_shift);
|
|
L_SUB(ftemp, pps_freq);
|
|
u_nsec = L_GINT(ftemp);
|
|
if (u_nsec > PPS_MAXWANDER) {
|
|
L_LINT(ftemp, PPS_MAXWANDER);
|
|
pps_intcnt--;
|
|
time_status |= STA_PPSWANDER;
|
|
pps_stbcnt++;
|
|
} else if (u_nsec < -PPS_MAXWANDER) {
|
|
L_LINT(ftemp, -PPS_MAXWANDER);
|
|
pps_intcnt--;
|
|
time_status |= STA_PPSWANDER;
|
|
pps_stbcnt++;
|
|
} else {
|
|
pps_intcnt++;
|
|
}
|
|
if (pps_intcnt >= 4) {
|
|
pps_intcnt = 4;
|
|
if (pps_shift < pps_shiftmax) {
|
|
pps_shift++;
|
|
pps_intcnt = 0;
|
|
}
|
|
} else if (pps_intcnt <= -4 || pps_shift > pps_shiftmax) {
|
|
pps_intcnt = -4;
|
|
if (pps_shift > PPS_FAVG) {
|
|
pps_shift--;
|
|
pps_intcnt = 0;
|
|
}
|
|
}
|
|
if (u_nsec < 0)
|
|
u_nsec = -u_nsec;
|
|
pps_stabil += (u_nsec * SCALE_PPM - pps_stabil) >> PPS_FAVG;
|
|
|
|
/*
|
|
* The PPS frequency is recalculated and clamped to the maximum
|
|
* MAXFREQ. If enabled, the system clock frequency is updated as
|
|
* well.
|
|
*/
|
|
L_ADD(pps_freq, ftemp);
|
|
u_nsec = L_GINT(pps_freq);
|
|
if (u_nsec > MAXFREQ)
|
|
L_LINT(pps_freq, MAXFREQ);
|
|
else if (u_nsec < -MAXFREQ)
|
|
L_LINT(pps_freq, -MAXFREQ);
|
|
if (time_status & STA_PPSFREQ)
|
|
time_freq = pps_freq;
|
|
}
|
|
#endif /* PPS_SYNC */
|
|
#endif /* NTP */
|
|
#else /* !__HAVE_TIMECOUNTER */
|
|
/******************************************************************************
|
|
* *
|
|
* Copyright (c) David L. Mills 1993, 1994 *
|
|
* *
|
|
* Permission to use, copy, modify, and distribute this software and its *
|
|
* documentation for any purpose and without fee is hereby granted, provided *
|
|
* that the above copyright notice appears in all copies and that both the *
|
|
* copyright notice and this permission notice appear in supporting *
|
|
* documentation, and that the name University of Delaware not be used in *
|
|
* advertising or publicity pertaining to distribution of the software *
|
|
* without specific, written prior permission. The University of Delaware *
|
|
* makes no representations about the suitability this software for any *
|
|
* purpose. It is provided "as is" without express or implied warranty. *
|
|
* *
|
|
******************************************************************************/
|
|
|
|
/*
|
|
* Modification history kern_ntptime.c
|
|
*
|
|
* 24 Sep 94 David L. Mills
|
|
* Tightened code at exits.
|
|
*
|
|
* 24 Mar 94 David L. Mills
|
|
* Revised syscall interface to include new variables for PPS
|
|
* time discipline.
|
|
*
|
|
* 14 Feb 94 David L. Mills
|
|
* Added code for external clock
|
|
*
|
|
* 28 Nov 93 David L. Mills
|
|
* Revised frequency scaling to conform with adjusted parameters
|
|
*
|
|
* 17 Sep 93 David L. Mills
|
|
* Created file
|
|
*/
|
|
/*
|
|
* ntp_gettime(), ntp_adjtime() - precision time interface for SunOS
|
|
* V4.1.1 and V4.1.3
|
|
*
|
|
* These routines consitute the Network Time Protocol (NTP) interfaces
|
|
* for user and daemon application programs. The ntp_gettime() routine
|
|
* provides the time, maximum error (synch distance) and estimated error
|
|
* (dispersion) to client user application programs. The ntp_adjtime()
|
|
* routine is used by the NTP daemon to adjust the system clock to an
|
|
* externally derived time. The time offset and related variables set by
|
|
* this routine are used by hardclock() to adjust the phase and
|
|
* frequency of the phase-lock loop which controls the system clock.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: kern_ntptime.c,v 1.41 2006/11/01 10:17:58 yamt Exp $");
|
|
|
|
#include "opt_ntp.h"
|
|
#include "opt_compat_netbsd.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/timex.h>
|
|
#ifdef COMPAT_30
|
|
#include <compat/sys/timex.h>
|
|
#endif
|
|
#include <sys/vnode.h>
|
|
#include <sys/kauth.h>
|
|
|
|
#include <sys/mount.h>
|
|
#include <sys/sa.h>
|
|
#include <sys/syscallargs.h>
|
|
|
|
#include <machine/cpu.h>
|
|
|
|
#ifdef NTP
|
|
/*
|
|
* The following variables are used by the hardclock() routine in the
|
|
* kern_clock.c module and are described in that module.
|
|
*/
|
|
extern int time_state; /* clock state */
|
|
extern int time_status; /* clock status bits */
|
|
extern long time_offset; /* time adjustment (us) */
|
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extern long time_freq; /* frequency offset (scaled ppm) */
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extern long time_maxerror; /* maximum error (us) */
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extern long time_esterror; /* estimated error (us) */
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extern long time_constant; /* pll time constant */
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extern long time_precision; /* clock precision (us) */
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extern long time_tolerance; /* frequency tolerance (scaled ppm) */
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extern int time_adjusted; /* ntp might have changed the system time */
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#ifdef PPS_SYNC
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/*
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* The following variables are used only if the PPS signal discipline
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* is configured in the kernel.
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*/
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extern int pps_shift; /* interval duration (s) (shift) */
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extern long pps_freq; /* pps frequency offset (scaled ppm) */
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extern long pps_jitter; /* pps jitter (us) */
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extern long pps_stabil; /* pps stability (scaled ppm) */
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extern long pps_jitcnt; /* jitter limit exceeded */
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extern long pps_calcnt; /* calibration intervals */
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extern long pps_errcnt; /* calibration errors */
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extern long pps_stbcnt; /* stability limit exceeded */
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#endif /* PPS_SYNC */
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/*ARGSUSED*/
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/*
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* ntp_gettime() - NTP user application interface
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*/
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void
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ntp_gettime(ntvp)
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struct ntptimeval *ntvp;
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{
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struct timeval atv;
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int s;
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memset(ntvp, 0, sizeof(struct ntptimeval));
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s = splclock();
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#ifdef EXT_CLOCK
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/*
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* The microtime() external clock routine returns a
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* status code. If less than zero, we declare an error
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* in the clock status word and return the kernel
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* (software) time variable. While there are other
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* places that call microtime(), this is the only place
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* that matters from an application point of view.
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*/
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if (microtime(&atv) < 0) {
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time_status |= STA_CLOCKERR;
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ntvp->time = time;
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} else
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time_status &= ~STA_CLOCKERR;
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#else /* EXT_CLOCK */
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microtime(&atv);
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#endif /* EXT_CLOCK */
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ntvp->maxerror = time_maxerror;
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ntvp->esterror = time_esterror;
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(void) splx(s);
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TIMEVAL_TO_TIMESPEC(&atv, &ntvp->time);
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}
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/* ARGSUSED */
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/*
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* ntp_adjtime() - NTP daemon application interface
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*/
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int
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sys_ntp_adjtime(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct sys_ntp_adjtime_args /* {
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syscallarg(struct timex *) tp;
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} */ *uap = v;
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struct timex ntv;
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int error = 0;
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error = copyin((caddr_t)SCARG(uap, tp), (caddr_t)&ntv, sizeof(ntv));
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if (error != 0)
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return (error);
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if (ntv.modes != 0 && (error = kauth_authorize_system(l->l_cred,
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KAUTH_SYSTEM_TIME, KAUTH_REQ_SYSTEM_TIME_NTPADJTIME, NULL,
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NULL, NULL)) != 0)
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return (error);
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ntp_adjtime1(&ntv);
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error = copyout((caddr_t)&ntv, (caddr_t)SCARG(uap, tp), sizeof(ntv));
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if (error == 0)
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*retval = ntp_timestatus();
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return error;
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}
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void
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ntp_adjtime1(ntv)
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struct timex *ntv;
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{
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int modes;
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int s;
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/*
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* Update selected clock variables. Note that there is no error
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* checking here on the assumption the superuser should know
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* what it is doing.
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*/
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modes = ntv->modes;
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if (modes != 0)
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/* We need to save the system time during shutdown */
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time_adjusted |= 2;
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s = splclock();
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if (modes & MOD_FREQUENCY)
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#ifdef PPS_SYNC
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time_freq = ntv->freq - pps_freq;
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#else /* PPS_SYNC */
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time_freq = ntv->freq;
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#endif /* PPS_SYNC */
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if (modes & MOD_MAXERROR)
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time_maxerror = ntv->maxerror;
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if (modes & MOD_ESTERROR)
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time_esterror = ntv->esterror;
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if (modes & MOD_STATUS) {
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time_status &= STA_RONLY;
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time_status |= ntv->status & ~STA_RONLY;
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}
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if (modes & MOD_TIMECONST)
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time_constant = ntv->constant;
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if (modes & MOD_OFFSET)
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hardupdate(ntv->offset);
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/*
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* Retrieve all clock variables
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*/
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if (time_offset < 0)
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ntv->offset = -(-time_offset >> SHIFT_UPDATE);
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else
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ntv->offset = time_offset >> SHIFT_UPDATE;
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#ifdef PPS_SYNC
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ntv->freq = time_freq + pps_freq;
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#else /* PPS_SYNC */
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ntv->freq = time_freq;
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#endif /* PPS_SYNC */
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ntv->maxerror = time_maxerror;
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ntv->esterror = time_esterror;
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ntv->status = time_status;
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ntv->constant = time_constant;
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ntv->precision = time_precision;
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ntv->tolerance = time_tolerance;
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#ifdef PPS_SYNC
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ntv->shift = pps_shift;
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ntv->ppsfreq = pps_freq;
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ntv->jitter = pps_jitter >> PPS_AVG;
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ntv->stabil = pps_stabil;
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ntv->calcnt = pps_calcnt;
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ntv->errcnt = pps_errcnt;
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ntv->jitcnt = pps_jitcnt;
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ntv->stbcnt = pps_stbcnt;
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#endif /* PPS_SYNC */
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(void)splx(s);
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}
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#endif /* NTP */
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#endif /* !__HAVE_TIMECOUNTER */
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#ifdef NTP
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int
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ntp_timestatus()
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{
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/*
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* Status word error decode. If any of these conditions
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* occur, an error is returned, instead of the status
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* word. Most applications will care only about the fact
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* the system clock may not be trusted, not about the
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* details.
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*
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* Hardware or software error
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*/
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if ((time_status & (STA_UNSYNC | STA_CLOCKERR)) ||
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/*
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* PPS signal lost when either time or frequency
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* synchronization requested
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*/
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(time_status & (STA_PPSFREQ | STA_PPSTIME) &&
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!(time_status & STA_PPSSIGNAL)) ||
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/*
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* PPS jitter exceeded when time synchronization
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* requested
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*/
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(time_status & STA_PPSTIME &&
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time_status & STA_PPSJITTER) ||
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/*
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* PPS wander exceeded or calibration error when
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* frequency synchronization requested
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*/
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(time_status & STA_PPSFREQ &&
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time_status & (STA_PPSWANDER | STA_PPSERROR)))
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return (TIME_ERROR);
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else
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return (time_state);
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}
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/*ARGSUSED*/
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/*
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* ntp_gettime() - NTP user application interface
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*/
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int
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sys___ntp_gettime30(struct lwp *l, void *v, register_t *retval)
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{
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struct sys___ntp_gettime30_args /* {
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syscallarg(struct ntptimeval *) ntvp;
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} */ *uap = v;
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struct ntptimeval ntv;
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int error = 0;
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if (SCARG(uap, ntvp)) {
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ntp_gettime(&ntv);
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error = copyout((caddr_t)&ntv, (caddr_t)SCARG(uap, ntvp),
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sizeof(ntv));
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}
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if (!error) {
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*retval = ntp_timestatus();
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}
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return(error);
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}
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#ifdef COMPAT_30
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int
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compat_30_sys_ntp_gettime(struct lwp *l, void *v, register_t *retval)
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{
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struct compat_30_sys_ntp_gettime_args /* {
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syscallarg(struct ntptimeval30 *) ontvp;
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} */ *uap = v;
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struct ntptimeval ntv;
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struct ntptimeval30 ontv;
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int error = 0;
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if (SCARG(uap, ntvp)) {
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ntp_gettime(&ntv);
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TIMESPEC_TO_TIMEVAL(&ontv.time, &ntv.time);
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ontv.maxerror = ntv.maxerror;
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ontv.esterror = ntv.esterror;
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error = copyout((caddr_t)&ontv, (caddr_t)SCARG(uap, ntvp),
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sizeof(ontv));
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}
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if (!error)
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*retval = ntp_timestatus();
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return (error);
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}
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#endif
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|
|
/*
|
|
* return information about kernel precision timekeeping
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|
*/
|
|
static int
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|
sysctl_kern_ntptime(SYSCTLFN_ARGS)
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|
{
|
|
struct sysctlnode node;
|
|
struct ntptimeval ntv;
|
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|
|
ntp_gettime(&ntv);
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|
node = *rnode;
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node.sysctl_data = &ntv;
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node.sysctl_size = sizeof(ntv);
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return (sysctl_lookup(SYSCTLFN_CALL(&node)));
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}
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|
|
SYSCTL_SETUP(sysctl_kern_ntptime_setup, "sysctl kern.ntptime node setup")
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|
{
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|
|
sysctl_createv(clog, 0, NULL, NULL,
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|
CTLFLAG_PERMANENT,
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|
CTLTYPE_NODE, "kern", NULL,
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|
NULL, 0, NULL, 0,
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|
CTL_KERN, CTL_EOL);
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|
sysctl_createv(clog, 0, NULL, NULL,
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|
CTLFLAG_PERMANENT,
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|
CTLTYPE_STRUCT, "ntptime",
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|
SYSCTL_DESCR("Kernel clock values for NTP"),
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|
sysctl_kern_ntptime, 0, NULL,
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|
sizeof(struct ntptimeval),
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|
CTL_KERN, KERN_NTPTIME, CTL_EOL);
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|
}
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|
#else /* !NTP */
|
|
/* For some reason, raising SIGSYS (as sys_nosys would) is problematic. */
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|
|
|
int
|
|
sys___ntp_gettime30(struct lwp *l, void *v, register_t *retval)
|
|
{
|
|
|
|
return(ENOSYS);
|
|
}
|
|
|
|
#ifdef COMPAT_30
|
|
int
|
|
compat_30_sys_ntp_gettime(struct lwp *l, void *v, register_t *retval)
|
|
{
|
|
|
|
return(ENOSYS);
|
|
}
|
|
#endif
|
|
#endif /* !NTP */
|