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authorAlexander Krutwig <alexander.krutwig@embedded-brains.de>2015-03-19 11:38:14 +0100
committerSebastian Huber <sebastian.huber@embedded-brains.de>2015-05-19 15:14:34 +0200
commit4117cd163977737a5e6633c7117d10aa194304cb (patch)
tree4fa7043428b9c082203951eba88ac6c2137e851c /cpukit/score/include/sys/timex.h
parentsmptests/smpscheduler03: Restructure (diff)
downloadrtems-4117cd163977737a5e6633c7117d10aa194304cb.tar.bz2
timecounter: Import from FreeBSD
Update #2271.
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-rw-r--r--cpukit/score/include/sys/timex.h171
1 files changed, 171 insertions, 0 deletions
diff --git a/cpukit/score/include/sys/timex.h b/cpukit/score/include/sys/timex.h
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+++ b/cpukit/score/include/sys/timex.h
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+/*-
+ ***********************************************************************
+ * *
+ * 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. *
+ * *
+ ***********************************************************************
+ *
+ * $FreeBSD r277406 2015-01-20T03:54:30Z$
+ *
+ * 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.
+ *
+ */
+
+#ifndef _SYS_TIMEX_H_
+#define _SYS_TIMEX_H_ 1
+
+#define NTP_API 4 /* NTP API version */
+
+#ifdef __FreeBSD__
+#include <sys/_timespec.h>
+#endif /* __FreeBSD__ */
+
+/*
+ * 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 */
+
+/*
+ * 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 (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 occured */
+#define TIME_ERROR 5 /* error (see status word) */
+
+/*
+ * NTP user interface -- ntp_gettime(2) - 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(2) -- 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 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 __FreeBSD__
+
+#ifdef _KERNEL
+void ntp_update_second(int64_t *adjustment, time_t *newsec);
+#else /* !_KERNEL */
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+int ntp_adjtime(struct timex *);
+int ntp_gettime(struct ntptimeval *);
+__END_DECLS
+#endif /* _KERNEL */
+
+#endif /* __FreeBSD__ */
+
+#endif /* !_SYS_TIMEX_H_ */