xref: /xnu-12377.81.4/bsd/sys/timex.h (revision 043036a2b3718f7f0be807e2870f8f47d3fa0796)

/*-
 ***********************************************************************
 *								       *
 * Copyright (c) David L. Mills 1993-2001			       *
 * Copyright (c) Poul-Henning Kamp 2000-2001                           *
 *								       *
 * 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.							       *
 *								       *
 ***********************************************************************
 *
 * $FreeBSD$
 *
 * This header file defines the Network Time Protocol (NTP) interfaces
 * for user and daemon application programs.
 *
 * This file was originally created 17 Sep 93 by David L. Mills, Professor
 * of University of Delaware, building on work which had already been ongoing
 * for a decade and a half at that point in time.
 *
 * In 2000 the APIs got a upgrade from microseconds to nanoseconds,
 * a joint work between Poul-Henning Kamp and David L. Mills.
 *
 */

/*
 * Copyright (c) 2017 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#ifndef _SYS_TIMEX_H_
#define _SYS_TIMEX_H_ 1

#include <sys/time.h>

#define NTP_API         4               /* NTP API version */

/*
 * 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 */

/* Codes for PPS (pulse-per-second) signals or leap seconds are not used but kept
 * unchanged and commented for future compatibility.
 */

/*
 * 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)

#define STA_SUPPORTED (STA_PLL | STA_FLL | STA_UNSYNC | STA_FREQHOLD | \
    STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)

/*
 * Clock states (ntptimeval.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 occurred */
#define TIME_ERROR      5               /* error (see status word) */

/*
 * NTP user interface -- ntp_gettime - used to read kernel clock values
 */
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 control/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 used by
	 * the PPS signal discipline that is currently not supported.
	 * They are included for compatibility.
	 */
	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
#ifdef XNU_KERNEL_PRIVATE
#include <sys/_types/_user32_timex.h>
#include <sys/_types/_user64_timex.h>
#include <sys/_types/_user32_ntptimeval.h>
#include <sys/_types/_user64_ntptimeval.h>
#include <kern/clock.h>

int64_t ntp_get_freq(void);
void    ntp_update_second(int64_t *adjustment, clock_sec_t secs);
void    ntp_init(void);
#endif
#else /* !_KERNEL */
#include <sys/cdefs.h>

__BEGIN_DECLS
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
int     ntp_adjtime(struct timex *);
int     ntp_gettime(struct ntptimeval *);
#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
__END_DECLS
#endif /* KERNEL */


#endif /* !_SYS_TIMEX_H_ */