237 lines
8.5 KiB
C
237 lines
8.5 KiB
C
/*-
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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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* Modification history timex.h
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*
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* 16 Aug 00 David L. Mills
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* API Version 4. Added MOD_TAI and tai member of ntptimeval
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* structure.
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*
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* 17 Nov 98 David L. Mills
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* Revised for nanosecond kernel and user interface.
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*
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* 26 Sep 94 David L. Mills
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* Added defines for hybrid phase/frequency-lock loop.
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*
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* 19 Mar 94 David L. Mills
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* Moved defines from kernel routines to header file and added new
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* defines for PPS phase-lock loop.
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*
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* 20 Feb 94 David L. Mills
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* Revised status codes and structures for external clock and PPS
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* signal discipline.
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*
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* 28 Nov 93 David L. Mills
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* Adjusted parameters to improve stability and increase poll
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* interval.
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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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* $FreeBSD$
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*/
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/*
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* This header file defines the Network Time Protocol (NTP) interfaces
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* for user and daemon application programs. These are implemented using
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* defined syscalls and data structures and require specific kernel
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* support.
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*
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* The original precision time kernels developed from 1993 have an
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* ultimate resolution of one microsecond; however, the most recent
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* kernels have an ultimate resolution of one nanosecond. In these
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* kernels, a ntp_adjtime() syscalls can be used to determine which
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* resolution is in use and to select either one at any time. The
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* resolution selected affects the scaling of certain fields in the
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* ntp_gettime() and ntp_adjtime() syscalls, as described below.
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*
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* NAME
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* ntp_gettime - NTP user application interface
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*
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* SYNOPSIS
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* #include <sys/timex.h>
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*
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* int ntp_gettime(struct ntptimeval *ntv);
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*
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* DESCRIPTION
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* The time returned by ntp_gettime() is in a timespec structure,
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* but may be in either microsecond (seconds and microseconds) or
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* nanosecond (seconds and nanoseconds) format. The particular
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* format in use is determined by the STA_NANO bit of the status
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* word returned by the ntp_adjtime() syscall.
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*
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* NAME
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* ntp_adjtime - NTP daemon application interface
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*
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* SYNOPSIS
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* #include <sys/timex.h>
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* #include <sys/syscall.h>
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*
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* int syscall(SYS_ntp_adjtime, tptr);
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* int SYS_ntp_adjtime;
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* struct timex *tptr;
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*
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* DESCRIPTION
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* Certain fields of the timex structure are interpreted in either
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* microseconds or nanoseconds according to the state of the
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* STA_NANO bit in the status word. See the description below for
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* further information.
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*/
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#ifndef _SYS_TIMEX_H_
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#define _SYS_TIMEX_H_ 1
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#define NTP_API 4 /* NTP API version */
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#ifndef MSDOS /* Microsoft specific */
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#include <sys/syscall.h>
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#endif /* MSDOS */
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/*
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* The following defines establish the performance envelope of the
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* kernel discipline loop. Phase or frequency errors greater than
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* NAXPHASE or MAXFREQ are clamped to these maxima. For update intervals
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* less than MINSEC, the loop always operates in PLL mode; while, for
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* update intervals greater than MAXSEC, the loop always operates in FLL
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* mode. Between these two limits the operating mode is selected by the
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* STA_FLL bit in the status word.
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*/
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#define MAXPHASE 500000000L /* max phase error (ns) */
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#define MAXFREQ 500000L /* max freq error (ns/s) */
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#define MINSEC 256 /* min FLL update interval (s) */
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#define MAXSEC 2048 /* max PLL update interval (s) */
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#define NANOSECOND 1000000000L /* nanoseconds in one second */
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#define SCALE_PPM (65536 / 1000) /* crude ns/s to scaled PPM */
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#define MAXTC 10 /* max time constant */
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/*
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* The following defines and structures define the user interface for
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* the ntp_gettime() and ntp_adjtime() syscalls.
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*
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* Control mode codes (timex.modes)
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*/
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#define MOD_OFFSET 0x0001 /* set time offset */
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#define MOD_FREQUENCY 0x0002 /* set frequency offset */
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#define MOD_MAXERROR 0x0004 /* set maximum time error */
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#define MOD_ESTERROR 0x0008 /* set estimated time error */
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#define MOD_STATUS 0x0010 /* set clock status bits */
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#define MOD_TIMECONST 0x0020 /* set PLL time constant */
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#define MOD_PPSMAX 0x0040 /* set PPS maximum averaging time */
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#define MOD_TAI 0x0080 /* set TAI offset */
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#define MOD_MICRO 0x1000 /* select microsecond resolution */
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#define MOD_NANO 0x2000 /* select nanosecond resolution */
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#define MOD_CLKB 0x4000 /* select clock B */
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#define MOD_CLKA 0x8000 /* select clock A */
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/*
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* Status codes (timex.status)
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*/
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#define STA_PLL 0x0001 /* enable PLL updates (rw) */
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#define STA_PPSFREQ 0x0002 /* enable PPS freq discipline (rw) */
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#define STA_PPSTIME 0x0004 /* enable PPS time discipline (rw) */
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#define STA_FLL 0x0008 /* enable FLL mode (rw) */
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#define STA_INS 0x0010 /* insert leap (rw) */
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#define STA_DEL 0x0020 /* delete leap (rw) */
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#define STA_UNSYNC 0x0040 /* clock unsynchronized (rw) */
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#define STA_FREQHOLD 0x0080 /* hold frequency (rw) */
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#define STA_PPSSIGNAL 0x0100 /* PPS signal present (ro) */
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#define STA_PPSJITTER 0x0200 /* PPS signal jitter exceeded (ro) */
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#define STA_PPSWANDER 0x0400 /* PPS signal wander exceeded (ro) */
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#define STA_PPSERROR 0x0800 /* PPS signal calibration error (ro) */
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#define STA_CLOCKERR 0x1000 /* clock hardware fault (ro) */
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#define STA_NANO 0x2000 /* resolution (0 = us, 1 = ns) (ro) */
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#define STA_MODE 0x4000 /* mode (0 = PLL, 1 = FLL) (ro) */
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#define STA_CLK 0x8000 /* clock source (0 = A, 1 = B) (ro) */
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#define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \
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STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)
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/*
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* Clock states (time_state)
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*/
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#define TIME_OK 0 /* no leap second warning */
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#define TIME_INS 1 /* insert leap second warning */
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#define TIME_DEL 2 /* delete leap second warning */
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#define TIME_OOP 3 /* leap second in progress */
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#define TIME_WAIT 4 /* leap second has occured */
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#define TIME_ERROR 5 /* error (see status word) */
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/*
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* NTP user interface (ntp_gettime()) - used to read kernel clock values
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*
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* Note: The time member is in microseconds if STA_NANO is zero and
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* nanoseconds if not.
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*/
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struct ntptimeval {
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struct timespec time; /* current time (ns) (ro) */
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long maxerror; /* maximum error (us) (ro) */
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long esterror; /* estimated error (us) (ro) */
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long tai; /* TAI offset */
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int time_state; /* time status */
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};
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/*
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* NTP daemon interface (ntp_adjtime()) - used to discipline CPU clock
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* oscillator and determine status.
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*
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* Note: The offset, precision and jitter members are in microseconds if
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* STA_NANO is zero and nanoseconds if not.
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*/
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struct timex {
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unsigned int modes; /* clock mode bits (wo) */
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long offset; /* time offset (ns/us) (rw) */
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long freq; /* frequency offset (scaled PPM) (rw) */
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long maxerror; /* maximum error (us) (rw) */
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long esterror; /* estimated error (us) (rw) */
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int status; /* clock status bits (rw) */
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long constant; /* poll interval (log2 s) (rw) */
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long precision; /* clock precision (ns/us) (ro) */
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long tolerance; /* clock frequency tolerance (scaled
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* PPM) (ro) */
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/*
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* The following read-only structure members are implemented
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* only if the PPS signal discipline is configured in the
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* kernel. They are included in all configurations to insure
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* portability.
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*/
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long ppsfreq; /* PPS frequency (scaled PPM) (ro) */
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long jitter; /* PPS jitter (ns/us) (ro) */
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int shift; /* interval duration (s) (shift) (ro) */
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long stabil; /* PPS stability (scaled PPM) (ro) */
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long jitcnt; /* jitter limit exceeded (ro) */
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long calcnt; /* calibration intervals (ro) */
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long errcnt; /* calibration errors (ro) */
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long stbcnt; /* stability limit exceeded (ro) */
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};
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#ifdef __FreeBSD__
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#ifdef _KERNEL
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void ntp_update_second(int64_t *adjustment, time_t *newsec);
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#else /* !_KERNEL */
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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int ntp_adjtime(struct timex *);
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int ntp_gettime(struct ntptimeval *);
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__END_DECLS
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#endif /* _KERNEL */
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#endif /* __FreeBSD__ */
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#endif /* !_SYS_TIMEX_H_ */
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