/*********************************************************************** *								       * * Copyright (c) David L. Mills 1993-2002			       * *								       * * 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 timex.h * * 16 Aug 00	David L. Mills *	API Version 4. Added MOD_TAI and tai member of ntptimeval *	structure. * * 17 Nov 98	David L. Mills *	Revised for nanosecond kernel and user interface. * * 26 Sep 94	David L. Mills *	Added defines for hybrid phase/frequency-lock loop. * * 19 Mar 94	David L. Mills *	Moved defines from kernel routines to header file and added new *	defines for PPS phase-lock loop. * * 20 Feb 94	David L. Mills *	Revised status codes and structures for external clock and PPS *	signal discipline. * * 28 Nov 93	David L. Mills *	Adjusted parameters to improve stability and increase poll *	interval. * * 17 Sep 93    David L. Mills *      Created file *//* * This header file defines the Network Time Protocol (NTP) interfaces * for user and daemon application programs. These are implemented using * defined syscalls and data structures and require specific kernel * support. * * The original precision time kernels developed from 1993 have an * ultimate resolution of one microsecond; however, the most recent * kernels have an ultimate resolution of one nanosecond. In these * kernels, a ntp_adjtime() syscalls can be used to determine which * resolution is in use and to select either one at any time. The * resolution selected affects the scaling of certain fields in the * ntp_gettime() and ntp_adjtime() syscalls, as described below. * * NAME *	ntp_gettime - NTP user application interface * * SYNOPSIS *	#include <sys/timex.h> *	#include <sys/syscall.h> * *	int syscall(SYS_ntp_gettime, tptr); *	int SYS_ntp_gettime; *	struct ntptimeval *tptr; * * DESCRIPTION *	The time returned by ntp_gettime() is in a timeval structure, *	but may be in either microsecond (seconds and microseconds) or *	nanosecond (seconds and nanoseconds) format. The particular *	format in use is determined by the STA_NANO bit of the status *	word returned by the ntp_adjtime() syscall. * * NAME *	ntp_adjtime - NTP daemon application interface * * SYNOPSIS *	#include <sys/timex.h> *	#include <sys/syscall.h> * *	int syscall(SYS_ntp_adjtime, tptr); *	int SYS_ntp_adjtime; *	struct timex *tptr; * * DESCRIPTION *	Certain fields of the timex structure are interpreted in either *	microseconds or nanoseconds according to the state of the *	STA_NANO bit in the status word. See the description below for *	further information. */#ifndef _SYS_TIMEX_H_#define _SYS_TIMEX_H_ 1#define NTP_API		4	/* NTP API version */#ifndef MSDOS			/* Microsoft specific */#include <sys/syscall.h>#endif /* MSDOS *//* * The following defines establish the performance envelope of the * kernel discipline loop. Phase or frequency errors greater than * NAXPHASE or MAXFREQ are clamped to these maxima. For update intervals * less than MINSEC, the loop always operates in PLL mode; while, for * update intervals greater than MAXSEC, the loop always operates in FLL * mode. Between these two limits the operating mode is selected by the * STA_FLL bit in the status word. */#define MAXPHASE	500000000L /* max phase error (ns) */#define MAXFREQ		500000L	/* max freq error (ns/s) */#define MINSEC		256	/* min FLL update interval (s) */#define MAXSEC		2048	/* max PLL update interval (s) */#define NANOSECOND	1000000000L /* nanoseconds in one second */#define SCALE_PPM	(65536 / 1000) /* crude ns/s to scaled PPM */#define MAXTC		10	/* max time constant *//* * The following defines and structures define the user interface for * the ntp_gettime() and ntp_adjtime() syscalls. * * Control mode codes (timex.modes) */#define MOD_OFFSET	0x0001	/* set time offset */#define MOD_FREQUENCY	0x0002	/* set frequency offset */#define MOD_MAXERROR	0x0004	/* set maximum time error */#define MOD_ESTERROR	0x0008	/* set estimated time error */#define MOD_STATUS	0x0010	/* set clock status bits */#define MOD_TIMECONST	0x0020	/* set PLL time constant */#define MOD_PPSMAX	0x0040	/* set PPS maximum averaging time */#define MOD_TAI		0x0080	/* set TAI offset */#define	MOD_MICRO	0x1000	/* select microsecond resolution */#define	MOD_NANO	0x2000	/* select nanosecond resolution */#define MOD_CLKB	0x4000	/* select clock B */#define MOD_CLKA	0x8000	/* select clock A *//* * Status codes (timex.status) */#define STA_PLL		0x0001	/* enable PLL updates (rw) */#define STA_PPSFREQ	0x0002	/* enable PPS freq discipline (rw) */#define STA_PPSTIME	0x0004	/* enable PPS time discipline (rw) */#define STA_FLL		0x0008	/* enable FLL mode (rw) */#define STA_INS		0x0010	/* insert leap (rw) */#define STA_DEL		0x0020	/* delete leap (rw) */#define STA_UNSYNC	0x0040	/* clock unsynchronized (rw) */#define STA_FREQHOLD	0x0080	/* hold frequency (rw) */#define STA_PPSSIGNAL	0x0100	/* PPS signal present (ro) */#define STA_PPSJITTER	0x0200	/* PPS signal jitter exceeded (ro) */#define STA_PPSWANDER	0x0400	/* PPS signal wander exceeded (ro) */#define STA_PPSERROR	0x0800	/* PPS signal calibration error (ro) */#define STA_CLOCKERR	0x1000	/* clock hardware fault (ro) */#define STA_NANO	0x2000	/* resolution (0 = us, 1 = ns) (ro) */#define STA_MODE	0x4000	/* mode (0 = PLL, 1 = FLL) (ro) */#define STA_CLK		0x8000	/* clock source (0 = A, 1 = B) (ro) */#define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \    STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)/* * Clock states (time_state) */#define TIME_OK		0	/* no leap second warning */#define TIME_INS	1	/* insert leap second warning */#define TIME_DEL	2	/* delete leap second warning */#define TIME_OOP	3	/* leap second in progress */#define TIME_WAIT	4	/* leap second has occured */#define TIME_ERROR	5	/* error (see status word) *//* * NTP user interface (ntp_gettime()) - used to read kernel clock values * * Note: The time member is in microseconds if STA_NANO is zero and * nanoseconds if not. */struct ntptimeval {#ifdef NTP_NANO	struct timespec time;	/* current time (ns) (ro) */#else	struct timeval time;	/* current time (us) (ro) */#endif /* NTP_NANO */	long maxerror;		/* maximum error (us) (ro) */	long esterror;		/* estimated error (us) (ro) */	long tai;		/* TAI offset */};/* * NTP daemon interface (ntp_adjtime()) - used to discipline CPU clock * oscillator and determine status. * * Note: The offset, precision and jitter members are in microseconds if * STA_NANO is zero and nanoseconds if not. */struct timex {	unsigned int modes;	/* clock mode bits (wo) */	long	offset;		/* time offset (ns/us) (rw) */	long	freq;		/* frequency offset (scaled PPM) (rw) */	long	maxerror;	/* maximum error (us) (rw) */	long	esterror;	/* estimated error (us) (rw) */	int	status;		/* clock status bits (rw) */	long	constant;	/* poll interval (log2 s) (rw) */	long	precision;	/* clock precision (ns/us) (ro) */	long	tolerance;	/* clock frequency tolerance (scaled				 * PPM) (ro) */	/*	 * The following read-only structure members are implemented	 * only if the PPS signal discipline is configured in the	 * kernel. They are included in all configurations to insure	 * portability.	 */	long	ppsfreq;	/* PPS frequency (scaled PPM) (ro) */	long	jitter;		/* PPS jitter (ns/us) (ro) */	int	shift;		/* interval duration (s) (shift) (ro) */	long	stabil;		/* PPS stability (scaled PPM) (ro) */	long	jitcnt;		/* jitter limit exceeded (ro) */	long	calcnt;		/* calibration intervals (ro) */	long	errcnt;		/* calibration errors (ro) */	long	stbcnt;		/* stability limit exceeded (ro) */};#endif /* _SYS_TIMEX_H_ */