395 lines
11 KiB
C
395 lines
11 KiB
C
/* $NetBSD: kern_ntptime.c,v 1.21 2002/05/03 01:22:30 eeh Exp $ */
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/******************************************************************************
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* *
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* Copyright (c) David L. Mills 1993, 1994 *
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* *
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* Permission to use, copy, modify, and distribute this software and its *
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* documentation for any purpose and without fee is hereby granted, provided *
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* that the above copyright notice appears in all copies and that both the *
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* copyright notice and this permission notice appear in supporting *
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* documentation, and that the name University of Delaware not be used in *
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* advertising or publicity pertaining to distribution of the software *
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* without specific, written prior permission. The University of Delaware *
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* makes no representations about the suitability this software for any *
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* purpose. It is provided "as is" without express or implied warranty. *
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* *
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******************************************************************************/
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/*
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* Modification history kern_ntptime.c
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*
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* 24 Sep 94 David L. Mills
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* Tightened code at exits.
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*
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* 24 Mar 94 David L. Mills
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* Revised syscall interface to include new variables for PPS
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* time discipline.
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*
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* 14 Feb 94 David L. Mills
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* Added code for external clock
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*
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* 28 Nov 93 David L. Mills
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* Revised frequency scaling to conform with adjusted parameters
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*
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* 17 Sep 93 David L. Mills
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* Created file
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*/
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/*
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* ntp_gettime(), ntp_adjtime() - precision time interface for SunOS
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* V4.1.1 and V4.1.3
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*
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* These routines consitute 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 hardclock() to adjust the phase and
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* frequency of the phase-lock loop which controls the system clock.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kern_ntptime.c,v 1.21 2002/05/03 01:22:30 eeh Exp $");
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#include "opt_ntp.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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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/syscallargs.h>
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#include <machine/cpu.h>
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#ifdef NTP
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/*
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* The following variables are used by the hardclock() routine in the
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* kern_clock.c module and are described in that module.
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*/
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extern int time_state; /* clock state */
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extern int time_status; /* clock status bits */
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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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#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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int
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sys_ntp_gettime(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_ntp_gettime_args /* {
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syscallarg(struct ntptimeval *) ntvp;
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} */ *uap = v;
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struct timeval atv;
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struct ntptimeval ntv;
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int error = 0;
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int s;
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if (SCARG(uap, ntvp)) {
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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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ntv.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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ntv.time = atv;
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ntv.maxerror = time_maxerror;
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ntv.esterror = time_esterror;
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(void) splx(s);
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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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/*
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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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*retval = TIME_ERROR;
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else
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*retval = (register_t)time_state;
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}
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return(error);
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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(p, v, retval)
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struct proc *p;
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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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if ((error = copyin((caddr_t)SCARG(uap, tp), (caddr_t)&ntv,
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sizeof(ntv))) != 0)
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return (error);
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if (ntv.modes != 0 && (error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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return (ntp_adjtime1(&ntv, v, retval));
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}
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int
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ntp_adjtime1(ntv, v, retval)
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struct timex *ntv;
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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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int error = 0;
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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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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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error = copyout((caddr_t)ntv, (caddr_t)SCARG(uap, tp), sizeof(*ntv));
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if (!error) {
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/*
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* Status word error decode. See comments in
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* ntp_gettime() routine.
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*/
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if ((time_status & (STA_UNSYNC | STA_CLOCKERR)) ||
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(time_status & (STA_PPSFREQ | STA_PPSTIME) &&
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!(time_status & STA_PPSSIGNAL)) ||
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(time_status & STA_PPSTIME &&
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time_status & STA_PPSJITTER) ||
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(time_status & STA_PPSFREQ &&
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time_status & (STA_PPSWANDER | STA_PPSERROR)))
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*retval = TIME_ERROR;
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else
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*retval = (register_t)time_state;
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}
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return error;
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}
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/*
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* return information about kernel precision timekeeping
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*/
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int
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sysctl_ntptime(where, sizep)
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void *where;
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size_t *sizep;
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{
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struct timeval atv;
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struct ntptimeval ntv;
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int s;
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/*
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* Construct ntp_timeval.
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*/
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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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ntv.time = time;
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} else {
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time_status &= ~STA_CLOCKERR;
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}
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#else /* EXT_CLOCK */
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microtime(&atv);
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#endif /* EXT_CLOCK */
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ntv.time = atv;
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ntv.maxerror = time_maxerror;
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ntv.esterror = time_esterror;
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splx(s);
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#ifdef notyet
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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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ntv.time_state = TIME_ERROR;
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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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ntv.time_state = TIME_ERROR;
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else
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ntv.time_state = time_state;
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#endif /* notyet */
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return (sysctl_rdstruct(where, sizep, NULL, &ntv, sizeof(ntv)));
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}
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#else /* !NTP */
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/* For some reason, raising SIGSYS (as sys_nosys would) is problematic. */
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int
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sys_ntp_gettime(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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return(ENOSYS);
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}
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#endif /* !NTP */
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