2 ***********************************************************************
4 * Copyright (c) David L. Mills 1993-2001 *
5 * Copyright (c) Poul-Henning Kamp 2000-2001 *
7 * Permission to use, copy, modify, and distribute this software and *
8 * its documentation for any purpose and without fee is hereby *
9 * granted, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission *
11 * notice appear in supporting documentation, and that the name *
12 * University of Delaware not be used in advertising or publicity *
13 * pertaining to distribution of the software without specific, *
14 * written prior permission. The University of Delaware makes no *
15 * representations about the suitability this software for any *
16 * purpose. It is provided "as is" without express or implied *
19 ***********************************************************************
23 * This header file defines the Network Time Protocol (NTP) interfaces
24 * for user and daemon application programs.
26 * This file was originally created 17 Sep 93 by David L. Mills, Professor
27 * of University of Delaware, building on work which had already been ongoing
28 * for a decade and a half at that point in time.
30 * In 2000 the APIs got a upgrade from microseconds to nanoseconds,
31 * a joint work between Poul-Henning Kamp and David L. Mills.
36 #define _SYS_TIMEX_H_ 1
38 #define NTP_API 4 /* NTP API version */
41 #include <sys/_timespec.h>
42 #endif /* __FreeBSD__ */
45 * The following defines establish the performance envelope of the
46 * kernel discipline loop. Phase or frequency errors greater than
47 * NAXPHASE or MAXFREQ are clamped to these maxima. For update intervals
48 * less than MINSEC, the loop always operates in PLL mode; while, for
49 * update intervals greater than MAXSEC, the loop always operates in FLL
50 * mode. Between these two limits the operating mode is selected by the
51 * STA_FLL bit in the status word.
54 #define MAXPHASE 500000000L /* max phase error (ns) */
55 #define MAXFREQ 500000L /* max freq error (ns/s) */
56 #define MINSEC 256 /* min FLL update interval (s) */
57 #define MAXSEC 2048 /* max PLL update interval (s) */
58 #define NANOSECOND 1000000000L /* nanoseconds in one second */
59 #define SCALE_PPM (65536 / 1000) /* crude ns/s to scaled PPM */
60 #define MAXTC 10 /* max time constant */
63 * Control mode codes (timex.modes)
65 #define MOD_OFFSET 0x0001 /* set time offset */
66 #define MOD_FREQUENCY 0x0002 /* set frequency offset */
67 #define MOD_MAXERROR 0x0004 /* set maximum time error */
68 #define MOD_ESTERROR 0x0008 /* set estimated time error */
69 #define MOD_STATUS 0x0010 /* set clock status bits */
70 #define MOD_TIMECONST 0x0020 /* set PLL time constant */
71 #define MOD_PPSMAX 0x0040 /* set PPS maximum averaging time */
72 #define MOD_TAI 0x0080 /* set TAI offset */
73 #define MOD_MICRO 0x1000 /* select microsecond resolution */
74 #define MOD_NANO 0x2000 /* select nanosecond resolution */
75 #define MOD_CLKB 0x4000 /* select clock B */
76 #define MOD_CLKA 0x8000 /* select clock A */
79 * Status codes (timex.status)
81 #define STA_PLL 0x0001 /* enable PLL updates (rw) */
82 #define STA_PPSFREQ 0x0002 /* enable PPS freq discipline (rw) */
83 #define STA_PPSTIME 0x0004 /* enable PPS time discipline (rw) */
84 #define STA_FLL 0x0008 /* enable FLL mode (rw) */
85 #define STA_INS 0x0010 /* insert leap (rw) */
86 #define STA_DEL 0x0020 /* delete leap (rw) */
87 #define STA_UNSYNC 0x0040 /* clock unsynchronized (rw) */
88 #define STA_FREQHOLD 0x0080 /* hold frequency (rw) */
89 #define STA_PPSSIGNAL 0x0100 /* PPS signal present (ro) */
90 #define STA_PPSJITTER 0x0200 /* PPS signal jitter exceeded (ro) */
91 #define STA_PPSWANDER 0x0400 /* PPS signal wander exceeded (ro) */
92 #define STA_PPSERROR 0x0800 /* PPS signal calibration error (ro) */
93 #define STA_CLOCKERR 0x1000 /* clock hardware fault (ro) */
94 #define STA_NANO 0x2000 /* resolution (0 = us, 1 = ns) (ro) */
95 #define STA_MODE 0x4000 /* mode (0 = PLL, 1 = FLL) (ro) */
96 #define STA_CLK 0x8000 /* clock source (0 = A, 1 = B) (ro) */
98 #define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \
99 STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)
102 * Clock states (ntptimeval.time_state)
104 #define TIME_OK 0 /* no leap second warning */
105 #define TIME_INS 1 /* insert leap second warning */
106 #define TIME_DEL 2 /* delete leap second warning */
107 #define TIME_OOP 3 /* leap second in progress */
108 #define TIME_WAIT 4 /* leap second has occurred */
109 #define TIME_ERROR 5 /* error (see status word) */
112 * NTP user interface -- ntp_gettime(2) - used to read kernel clock values
115 struct timespec time; /* current time (ns) (ro) */
116 long maxerror; /* maximum error (us) (ro) */
117 long esterror; /* estimated error (us) (ro) */
118 long tai; /* TAI offset */
119 int time_state; /* time status */
123 * NTP daemon interface -- ntp_adjtime(2) -- used to discipline CPU clock
124 * oscillator and control/determine status.
126 * Note: The offset, precision and jitter members are in microseconds if
127 * STA_NANO is zero and nanoseconds if not.
130 unsigned int modes; /* clock mode bits (wo) */
131 long offset; /* time offset (ns/us) (rw) */
132 long freq; /* frequency offset (scaled PPM) (rw) */
133 long maxerror; /* maximum error (us) (rw) */
134 long esterror; /* estimated error (us) (rw) */
135 int status; /* clock status bits (rw) */
136 long constant; /* poll interval (log2 s) (rw) */
137 long precision; /* clock precision (ns/us) (ro) */
138 long tolerance; /* clock frequency tolerance (scaled
141 * The following read-only structure members are implemented
142 * only if the PPS signal discipline is configured in the
143 * kernel. They are included in all configurations to insure
146 long ppsfreq; /* PPS frequency (scaled PPM) (ro) */
147 long jitter; /* PPS jitter (ns/us) (ro) */
148 int shift; /* interval duration (s) (shift) (ro) */
149 long stabil; /* PPS stability (scaled PPM) (ro) */
150 long jitcnt; /* jitter limit exceeded (ro) */
151 long calcnt; /* calibration intervals (ro) */
152 long errcnt; /* calibration errors (ro) */
153 long stbcnt; /* stability limit exceeded (ro) */
159 void ntp_update_second(int64_t *adjustment, time_t *newsec);
161 #include <sys/cdefs.h>
164 int ntp_adjtime(struct timex *);
165 int ntp_gettime(struct ntptimeval *);
169 #endif /* __FreeBSD__ */
171 #endif /* !_SYS_TIMEX_H_ */