260 lines
9.0 KiB
C
260 lines
9.0 KiB
C
/* $NetBSD: timex.h,v 1.18 2009/04/05 19:59:26 christos Exp $ */
|
|
|
|
/*-
|
|
***********************************************************************
|
|
* *
|
|
* Copyright (c) David L. Mills 1993-2001 *
|
|
* *
|
|
* 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
|
|
*
|
|
* $FreeBSD: src/sys/sys/timex.h,v 1.18 2005/01/07 02:29:24 imp Exp $
|
|
*/
|
|
/*
|
|
* 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>
|
|
*
|
|
* int ntp_gettime(struct ntptimeval *ntv);
|
|
*
|
|
* DESCRIPTION
|
|
* The time returned by ntp_gettime() is in a timespec 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 */
|
|
|
|
#include <sys/syscall.h>
|
|
|
|
/*
|
|
* 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_FMT "\177\020\
|
|
b\0PLL\0\
|
|
b\1PPSFREQ\0\
|
|
b\2PPSTIME\0\
|
|
b\3FLL\0\
|
|
b\4INS\0\
|
|
b\5DEL\0\
|
|
b\6UNSYNC\0\
|
|
b\7FREQHOLD\0\
|
|
b\10PPSSIGNAL\0\
|
|
b\11PPSJITTER\0\
|
|
b\12PPSWANDER\0\
|
|
b\13PPSERROR\0\
|
|
b\14CLOCKERR\0\
|
|
b\15NANO\0\
|
|
f\16\1MODE\0=\0PLL\0=\1FLL\0\
|
|
f\17\1CLK\0=\0A\0=\1B\0"
|
|
|
|
#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 {
|
|
struct timespec time; /* current time (ns) (ro) */
|
|
long maxerror; /* maximum error (us) (ro) */
|
|
long esterror; /* estimated error (us) (ro) */
|
|
long tai; /* TAI offset */
|
|
int time_state; /* time status */
|
|
};
|
|
|
|
/*
|
|
* 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) */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
#include <sys/mutex.h>
|
|
|
|
void ntp_update_second(int64_t *adjustment, time_t *newsec);
|
|
void ntp_adjtime1(struct timex *);
|
|
void ntp_gettime(struct ntptimeval *);
|
|
int ntp_timestatus(void);
|
|
|
|
extern kmutex_t timecounter_lock;
|
|
#else /* !_KERNEL */
|
|
|
|
__BEGIN_DECLS
|
|
#ifndef __LIBC12_SOURCE__
|
|
int ntp_gettime(struct ntptimeval *) __RENAME(__ntp_gettime50);
|
|
#endif
|
|
int ntp_adjtime(struct timex *);
|
|
__END_DECLS
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* _SYS_TIMEX_H_ */
|