version 1.29, 2005/12/11 12:24:29 |
version 1.29.8.2, 2006/06/26 12:52:56 |
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/* $NetBSD$ */ |
/* $NetBSD$ */ |
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#include <sys/types.h> /* XXX to get __HAVE_TIMECOUNTER, remove |
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after all ports are converted. */ |
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#ifdef __HAVE_TIMECOUNTER |
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/*- |
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*********************************************************************** |
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* * |
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* Copyright (c) David L. Mills 1993-2001 * |
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* * |
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* Permission to use, copy, modify, and distribute this software and * |
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* its documentation for any purpose and without fee is hereby * |
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* granted, provided that the above copyright notice appears in all * |
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* copies and that both the copyright notice and this permission * |
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* notice appear in supporting documentation, and that the name * |
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* University of Delaware not be used in advertising or publicity * |
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* pertaining to distribution of the software without specific, * |
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* written prior permission. The University of Delaware makes no * |
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* representations about the suitability this software for any * |
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* purpose. It is provided "as is" without express or implied * |
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* warranty. * |
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* * |
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**********************************************************************/ |
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/* |
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* Adapted from the original sources for FreeBSD and timecounters by: |
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* Poul-Henning Kamp <phk@FreeBSD.org>. |
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* |
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* The 32bit version of the "LP" macros seems a bit past its "sell by" |
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* date so I have retained only the 64bit version and included it directly |
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* in this file. |
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* |
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* Only minor changes done to interface with the timecounters over in |
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* sys/kern/kern_clock.c. Some of the comments below may be (even more) |
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* confusing and/or plain wrong in that context. |
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*/ |
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#include <sys/cdefs.h> |
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/* __FBSDID("$FreeBSD: src/sys/kern/kern_ntptime.c,v 1.59 2005/05/28 14:34:41 rwatson Exp $"); */ |
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__KERNEL_RCSID(0, "$NetBSD$"); |
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#include "opt_ntp.h" |
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#include "opt_compat_netbsd.h" |
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#include <sys/param.h> |
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#include <sys/resourcevar.h> |
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#include <sys/systm.h> |
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#include <sys/kernel.h> |
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#include <sys/proc.h> |
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#include <sys/sysctl.h> |
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#include <sys/timex.h> |
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#ifdef COMPAT_30 |
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#include <compat/sys/timex.h> |
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#endif |
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#include <sys/vnode.h> |
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#include <sys/kauth.h> |
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#include <sys/mount.h> |
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#include <sys/sa.h> |
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#include <sys/syscallargs.h> |
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#include <machine/cpu.h> |
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/* |
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* Single-precision macros for 64-bit machines |
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*/ |
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typedef int64_t l_fp; |
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#define L_ADD(v, u) ((v) += (u)) |
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#define L_SUB(v, u) ((v) -= (u)) |
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#define L_ADDHI(v, a) ((v) += (int64_t)(a) << 32) |
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#define L_NEG(v) ((v) = -(v)) |
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#define L_RSHIFT(v, n) \ |
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do { \ |
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if ((v) < 0) \ |
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(v) = -(-(v) >> (n)); \ |
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else \ |
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(v) = (v) >> (n); \ |
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} while (0) |
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#define L_MPY(v, a) ((v) *= (a)) |
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#define L_CLR(v) ((v) = 0) |
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#define L_ISNEG(v) ((v) < 0) |
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#define L_LINT(v, a) ((v) = (int64_t)(a) << 32) |
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#define L_GINT(v) ((v) < 0 ? -(-(v) >> 32) : (v) >> 32) |
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#ifdef NTP |
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/* |
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* Generic NTP kernel interface |
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* |
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* These routines constitute the Network Time Protocol (NTP) interfaces |
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* for user and daemon application programs. The ntp_gettime() routine |
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* provides the time, maximum error (synch distance) and estimated error |
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* (dispersion) to client user application programs. The ntp_adjtime() |
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* routine is used by the NTP daemon to adjust the system clock to an |
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* externally derived time. The time offset and related variables set by |
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* this routine are used by other routines in this module to adjust the |
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* phase and frequency of the clock discipline loop which controls the |
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* system clock. |
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* |
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* When the kernel time is reckoned directly in nanoseconds (NTP_NANO |
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* defined), the time at each tick interrupt is derived directly from |
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* the kernel time variable. When the kernel time is reckoned in |
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* microseconds, (NTP_NANO undefined), the time is derived from the |
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* kernel time variable together with a variable representing the |
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* leftover nanoseconds at the last tick interrupt. In either case, the |
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* current nanosecond time is reckoned from these values plus an |
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* interpolated value derived by the clock routines in another |
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* architecture-specific module. The interpolation can use either a |
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* dedicated counter or a processor cycle counter (PCC) implemented in |
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* some architectures. |
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* |
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* Note that all routines must run at priority splclock or higher. |
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*/ |
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/* |
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* Phase/frequency-lock loop (PLL/FLL) definitions |
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* |
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* The nanosecond clock discipline uses two variable types, time |
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* variables and frequency variables. Both types are represented as 64- |
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* bit fixed-point quantities with the decimal point between two 32-bit |
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* halves. On a 32-bit machine, each half is represented as a single |
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* word and mathematical operations are done using multiple-precision |
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* arithmetic. On a 64-bit machine, ordinary computer arithmetic is |
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* used. |
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* |
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* A time variable is a signed 64-bit fixed-point number in ns and |
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* fraction. It represents the remaining time offset to be amortized |
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* over succeeding tick interrupts. The maximum time offset is about |
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* 0.5 s and the resolution is about 2.3e-10 ns. |
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* |
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* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 |
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |s s s| ns | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | fraction | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |
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* A frequency variable is a signed 64-bit fixed-point number in ns/s |
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* and fraction. It represents the ns and fraction to be added to the |
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* kernel time variable at each second. The maximum frequency offset is |
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* about +-500000 ns/s and the resolution is about 2.3e-10 ns/s. |
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* |
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* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 |
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |s s s s s s s s s s s s s| ns/s | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | fraction | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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*/ |
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/* |
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* The following variables establish the state of the PLL/FLL and the |
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* residual time and frequency offset of the local clock. |
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*/ |
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#define SHIFT_PLL 4 /* PLL loop gain (shift) */ |
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#define SHIFT_FLL 2 /* FLL loop gain (shift) */ |
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static int time_state = TIME_OK; /* clock state */ |
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static int time_status = STA_UNSYNC; /* clock status bits */ |
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static long time_tai; /* TAI offset (s) */ |
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static long time_monitor; /* last time offset scaled (ns) */ |
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static long time_constant; /* poll interval (shift) (s) */ |
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static long time_precision = 1; /* clock precision (ns) */ |
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static long time_maxerror = MAXPHASE / 1000; /* maximum error (us) */ |
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static long time_esterror = MAXPHASE / 1000; /* estimated error (us) */ |
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static long time_reftime; /* time at last adjustment (s) */ |
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static l_fp time_offset; /* time offset (ns) */ |
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static l_fp time_freq; /* frequency offset (ns/s) */ |
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#endif /* NTP */ |
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static l_fp time_adj; /* tick adjust (ns/s) */ |
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int64_t time_adjtime; /* correction from adjtime(2) (usec) */ |
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extern int time_adjusted; /* ntp might have changed the system time */ |
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#ifdef NTP |
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#ifdef PPS_SYNC |
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/* |
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* The following variables are used when a pulse-per-second (PPS) signal |
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* is available and connected via a modem control lead. They establish |
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* the engineering parameters of the clock discipline loop when |
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* controlled by the PPS signal. |
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*/ |
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#define PPS_FAVG 2 /* min freq avg interval (s) (shift) */ |
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#define PPS_FAVGDEF 8 /* default freq avg int (s) (shift) */ |
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#define PPS_FAVGMAX 15 /* max freq avg interval (s) (shift) */ |
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#define PPS_PAVG 4 /* phase avg interval (s) (shift) */ |
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#define PPS_VALID 120 /* PPS signal watchdog max (s) */ |
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#define PPS_MAXWANDER 100000 /* max PPS wander (ns/s) */ |
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#define PPS_POPCORN 2 /* popcorn spike threshold (shift) */ |
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static struct timespec pps_tf[3]; /* phase median filter */ |
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static l_fp pps_freq; /* scaled frequency offset (ns/s) */ |
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static long pps_fcount; /* frequency accumulator */ |
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static long pps_jitter; /* nominal jitter (ns) */ |
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static long pps_stabil; /* nominal stability (scaled ns/s) */ |
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static long pps_lastsec; /* time at last calibration (s) */ |
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static int pps_valid; /* signal watchdog counter */ |
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static int pps_shift = PPS_FAVG; /* interval duration (s) (shift) */ |
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static int pps_shiftmax = PPS_FAVGDEF; /* max interval duration (s) (shift) */ |
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static int pps_intcnt; /* wander counter */ |
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/* |
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* PPS signal quality monitors |
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*/ |
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static long pps_calcnt; /* calibration intervals */ |
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static long pps_jitcnt; /* jitter limit exceeded */ |
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static long pps_stbcnt; /* stability limit exceeded */ |
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static long pps_errcnt; /* calibration errors */ |
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#endif /* PPS_SYNC */ |
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/* |
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* End of phase/frequency-lock loop (PLL/FLL) definitions |
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*/ |
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static void hardupdate(long offset); |
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/* |
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* ntp_gettime() - NTP user application interface |
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*/ |
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void |
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ntp_gettime(ntv) |
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struct ntptimeval *ntv; |
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{ |
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nanotime(&ntv->time); |
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ntv->maxerror = time_maxerror; |
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ntv->esterror = time_esterror; |
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ntv->tai = time_tai; |
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ntv->time_state = time_state; |
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} |
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/* ARGSUSED */ |
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/* |
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* ntp_adjtime() - NTP daemon application interface |
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*/ |
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int |
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sys_ntp_adjtime(l, v, retval) |
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struct lwp *l; |
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void *v; |
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register_t *retval; |
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{ |
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struct sys_ntp_adjtime_args /* { |
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syscallarg(struct timex *) tp; |
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} */ *uap = v; |
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struct proc *p = l->l_proc; |
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struct timex ntv; |
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int error = 0; |
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if ((error = copyin((caddr_t)SCARG(uap, tp), (caddr_t)&ntv, |
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sizeof(ntv))) != 0) |
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return (error); |
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if (ntv.modes != 0 && (error = kauth_authorize_generic(p->p_cred, |
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KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) |
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return (error); |
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ntp_adjtime1(&ntv); |
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error = copyout((caddr_t)&ntv, (caddr_t)SCARG(uap, tp), sizeof(ntv)); |
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if (!error) { |
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*retval = ntp_timestatus(); |
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} |
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return error; |
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} |
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void |
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ntp_adjtime1(ntv) |
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struct timex *ntv; |
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{ |
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long freq; |
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int modes; |
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int s; |
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/* |
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* Update selected clock variables - only the superuser can |
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* change anything. Note that there is no error checking here on |
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* the assumption the superuser should know what it is doing. |
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* Note that either the time constant or TAI offset are loaded |
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* from the ntv.constant member, depending on the mode bits. If |
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* the STA_PLL bit in the status word is cleared, the state and |
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* status words are reset to the initial values at boot. |
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*/ |
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modes = ntv->modes; |
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if (modes != 0) |
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/* We need to save the system time during shutdown */ |
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time_adjusted |= 2; |
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s = splclock(); |
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if (modes & MOD_MAXERROR) |
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time_maxerror = ntv->maxerror; |
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if (modes & MOD_ESTERROR) |
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time_esterror = ntv->esterror; |
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if (modes & MOD_STATUS) { |
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if (time_status & STA_PLL && !(ntv->status & STA_PLL)) { |
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time_state = TIME_OK; |
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time_status = STA_UNSYNC; |
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#ifdef PPS_SYNC |
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pps_shift = PPS_FAVG; |
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#endif /* PPS_SYNC */ |
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} |
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time_status &= STA_RONLY; |
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time_status |= ntv->status & ~STA_RONLY; |
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} |
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if (modes & MOD_TIMECONST) { |
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if (ntv->constant < 0) |
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time_constant = 0; |
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else if (ntv->constant > MAXTC) |
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time_constant = MAXTC; |
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else |
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time_constant = ntv->constant; |
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} |
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if (modes & MOD_TAI) { |
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if (ntv->constant > 0) /* XXX zero & negative numbers ? */ |
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time_tai = ntv->constant; |
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} |
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#ifdef PPS_SYNC |
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if (modes & MOD_PPSMAX) { |
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if (ntv->shift < PPS_FAVG) |
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pps_shiftmax = PPS_FAVG; |
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else if (ntv->shift > PPS_FAVGMAX) |
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pps_shiftmax = PPS_FAVGMAX; |
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else |
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pps_shiftmax = ntv->shift; |
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} |
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#endif /* PPS_SYNC */ |
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if (modes & MOD_NANO) |
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time_status |= STA_NANO; |
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if (modes & MOD_MICRO) |
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time_status &= ~STA_NANO; |
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if (modes & MOD_CLKB) |
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time_status |= STA_CLK; |
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if (modes & MOD_CLKA) |
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time_status &= ~STA_CLK; |
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if (modes & MOD_FREQUENCY) { |
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freq = (ntv->freq * 1000LL) >> 16; |
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if (freq > MAXFREQ) |
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L_LINT(time_freq, MAXFREQ); |
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else if (freq < -MAXFREQ) |
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L_LINT(time_freq, -MAXFREQ); |
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else { |
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/* |
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* ntv.freq is [PPM * 2^16] = [us/s * 2^16] |
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* time_freq is [ns/s * 2^32] |
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*/ |
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time_freq = ntv->freq * 1000LL * 65536LL; |
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} |
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#ifdef PPS_SYNC |
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pps_freq = time_freq; |
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#endif /* PPS_SYNC */ |
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} |
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if (modes & MOD_OFFSET) { |
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if (time_status & STA_NANO) |
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hardupdate(ntv->offset); |
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else |
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hardupdate(ntv->offset * 1000); |
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} |
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/* |
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* Retrieve all clock variables. Note that the TAI offset is |
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* returned only by ntp_gettime(); |
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*/ |
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if (time_status & STA_NANO) |
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ntv->offset = L_GINT(time_offset); |
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else |
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ntv->offset = L_GINT(time_offset) / 1000; /* XXX rounding ? */ |
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ntv->freq = L_GINT((time_freq / 1000LL) << 16); |
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ntv->maxerror = time_maxerror; |
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ntv->esterror = time_esterror; |
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ntv->status = time_status; |
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ntv->constant = time_constant; |
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if (time_status & STA_NANO) |
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ntv->precision = time_precision; |
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else |
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ntv->precision = time_precision / 1000; |
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ntv->tolerance = MAXFREQ * SCALE_PPM; |
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#ifdef PPS_SYNC |
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ntv->shift = pps_shift; |
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ntv->ppsfreq = L_GINT((pps_freq / 1000LL) << 16); |
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if (time_status & STA_NANO) |
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ntv->jitter = pps_jitter; |
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else |
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ntv->jitter = pps_jitter / 1000; |
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ntv->stabil = pps_stabil; |
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ntv->calcnt = pps_calcnt; |
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ntv->errcnt = pps_errcnt; |
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ntv->jitcnt = pps_jitcnt; |
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ntv->stbcnt = pps_stbcnt; |
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#endif /* PPS_SYNC */ |
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splx(s); |
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} |
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#endif /* NTP */ |
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/* |
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* second_overflow() - called after ntp_tick_adjust() |
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* |
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* This routine is ordinarily called immediately following the above |
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* routine ntp_tick_adjust(). While these two routines are normally |
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* combined, they are separated here only for the purposes of |
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* simulation. |
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*/ |
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void |
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ntp_update_second(int64_t *adjustment, time_t *newsec) |
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{ |
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int tickrate; |
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l_fp ftemp; /* 32/64-bit temporary */ |
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#ifdef NTP |
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/* |
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* On rollover of the second both the nanosecond and microsecond |
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* clocks are updated and the state machine cranked as |
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* necessary. The phase adjustment to be used for the next |
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* second is calculated and the maximum error is increased by |
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* the tolerance. |
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*/ |
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time_maxerror += MAXFREQ / 1000; |
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/* |
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* Leap second processing. If in leap-insert state at |
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* the end of the day, the system clock is set back one |
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* second; if in leap-delete state, the system clock is |
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* set ahead one second. The nano_time() routine or |
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* external clock driver will insure that reported time |
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* is always monotonic. |
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*/ |
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switch (time_state) { |
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/* |
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* No warning. |
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*/ |
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case TIME_OK: |
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if (time_status & STA_INS) |
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time_state = TIME_INS; |
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else if (time_status & STA_DEL) |
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time_state = TIME_DEL; |
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break; |
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/* |
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* Insert second 23:59:60 following second |
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* 23:59:59. |
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*/ |
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case TIME_INS: |
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if (!(time_status & STA_INS)) |
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time_state = TIME_OK; |
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else if ((*newsec) % 86400 == 0) { |
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(*newsec)--; |
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time_state = TIME_OOP; |
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time_tai++; |
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} |
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break; |
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/* |
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* Delete second 23:59:59. |
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*/ |
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case TIME_DEL: |
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if (!(time_status & STA_DEL)) |
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time_state = TIME_OK; |
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else if (((*newsec) + 1) % 86400 == 0) { |
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(*newsec)++; |
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time_tai--; |
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time_state = TIME_WAIT; |
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} |
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break; |
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/* |
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* Insert second in progress. |
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*/ |
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case TIME_OOP: |
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time_state = TIME_WAIT; |
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break; |
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|
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/* |
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* Wait for status bits to clear. |
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*/ |
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case TIME_WAIT: |
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if (!(time_status & (STA_INS | STA_DEL))) |
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time_state = TIME_OK; |
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} |
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|
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/* |
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* Compute the total time adjustment for the next second |
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* in ns. The offset is reduced by a factor depending on |
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* whether the PPS signal is operating. Note that the |
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* value is in effect scaled by the clock frequency, |
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* since the adjustment is added at each tick interrupt. |
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*/ |
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ftemp = time_offset; |
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#ifdef PPS_SYNC |
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/* XXX even if PPS signal dies we should finish adjustment ? */ |
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if (time_status & STA_PPSTIME && time_status & |
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STA_PPSSIGNAL) |
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L_RSHIFT(ftemp, pps_shift); |
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else |
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L_RSHIFT(ftemp, SHIFT_PLL + time_constant); |
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#else |
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L_RSHIFT(ftemp, SHIFT_PLL + time_constant); |
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#endif /* PPS_SYNC */ |
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time_adj = ftemp; |
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L_SUB(time_offset, ftemp); |
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L_ADD(time_adj, time_freq); |
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|
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#ifdef PPS_SYNC |
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if (pps_valid > 0) |
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pps_valid--; |
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else |
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time_status &= ~STA_PPSSIGNAL; |
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#endif /* PPS_SYNC */ |
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|
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#endif /* NTP */ |
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|
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/* |
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* Apply any correction from adjtime(2). If more than one second |
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* off we slew at a rate of 5ms/s (5000 PPM) else 500us/s (500PPM) |
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* until the last second is slewed the final < 500 usecs. |
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*/ |
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if (time_adjtime != 0) { |
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if (time_adjtime > 1000000) |
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tickrate = 5000; |
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else if (time_adjtime < -1000000) |
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tickrate = -5000; |
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else if (time_adjtime > 500) |
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tickrate = 500; |
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else if (time_adjtime < -500) |
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tickrate = -500; |
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else |
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tickrate = time_adjtime; |
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time_adjtime -= tickrate; |
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L_LINT(ftemp, tickrate * 1000); |
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L_ADD(time_adj, ftemp); |
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} |
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*adjustment = time_adj; |
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} |
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|
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/* |
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* ntp_init() - initialize variables and structures |
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* |
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* This routine must be called after the kernel variables hz and tick |
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* are set or changed and before the next tick interrupt. In this |
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* particular implementation, these values are assumed set elsewhere in |
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* the kernel. The design allows the clock frequency and tick interval |
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* to be changed while the system is running. So, this routine should |
|
* probably be integrated with the code that does that. |
|
*/ |
|
void |
|
ntp_init(void) |
|
{ |
|
|
|
/* |
|
* The following variables are initialized only at startup. Only |
|
* those structures not cleared by the compiler need to be |
|
* initialized, and these only in the simulator. In the actual |
|
* kernel, any nonzero values here will quickly evaporate. |
|
*/ |
|
L_CLR(time_adj); |
|
#ifdef NTP |
|
L_CLR(time_offset); |
|
L_CLR(time_freq); |
|
#ifdef PPS_SYNC |
|
pps_tf[0].tv_sec = pps_tf[0].tv_nsec = 0; |
|
pps_tf[1].tv_sec = pps_tf[1].tv_nsec = 0; |
|
pps_tf[2].tv_sec = pps_tf[2].tv_nsec = 0; |
|
pps_fcount = 0; |
|
L_CLR(pps_freq); |
|
#endif /* PPS_SYNC */ |
|
#endif |
|
} |
|
|
|
#ifdef NTP |
|
/* |
|
* hardupdate() - local clock update |
|
* |
|
* This routine is called by ntp_adjtime() to update the local clock |
|
* phase and frequency. The implementation is of an adaptive-parameter, |
|
* hybrid phase/frequency-lock loop (PLL/FLL). The routine computes new |
|
* time and frequency offset estimates for each call. If the kernel PPS |
|
* discipline code is configured (PPS_SYNC), the PPS signal itself |
|
* determines the new time offset, instead of the calling argument. |
|
* Presumably, calls to ntp_adjtime() occur only when the caller |
|
* believes the local clock is valid within some bound (+-128 ms with |
|
* NTP). If the caller's time is far different than the PPS time, an |
|
* argument will ensue, and it's not clear who will lose. |
|
* |
|
* For uncompensated quartz crystal oscillators and nominal update |
|
* intervals less than 256 s, operation should be in phase-lock mode, |
|
* where the loop is disciplined to phase. For update intervals greater |
|
* than 1024 s, operation should be in frequency-lock mode, where the |
|
* loop is disciplined to frequency. Between 256 s and 1024 s, the mode |
|
* is selected by the STA_MODE status bit. |
|
* |
|
* Note: splclock() is in effect. |
|
*/ |
|
void |
|
hardupdate(long offset) |
|
{ |
|
long mtemp; |
|
l_fp ftemp; |
|
|
|
/* |
|
* Select how the phase is to be controlled and from which |
|
* source. If the PPS signal is present and enabled to |
|
* discipline the time, the PPS offset is used; otherwise, the |
|
* argument offset is used. |
|
*/ |
|
if (!(time_status & STA_PLL)) |
|
return; |
|
if (!(time_status & STA_PPSTIME && time_status & |
|
STA_PPSSIGNAL)) { |
|
if (offset > MAXPHASE) |
|
time_monitor = MAXPHASE; |
|
else if (offset < -MAXPHASE) |
|
time_monitor = -MAXPHASE; |
|
else |
|
time_monitor = offset; |
|
L_LINT(time_offset, time_monitor); |
|
} |
|
|
|
/* |
|
* Select how the frequency is to be controlled and in which |
|
* mode (PLL or FLL). If the PPS signal is present and enabled |
|
* to discipline the frequency, the PPS frequency is used; |
|
* otherwise, the argument offset is used to compute it. |
|
*/ |
|
if (time_status & STA_PPSFREQ && time_status & STA_PPSSIGNAL) { |
|
time_reftime = time_second; |
|
return; |
|
} |
|
if (time_status & STA_FREQHOLD || time_reftime == 0) |
|
time_reftime = time_second; |
|
mtemp = time_second - time_reftime; |
|
L_LINT(ftemp, time_monitor); |
|
L_RSHIFT(ftemp, (SHIFT_PLL + 2 + time_constant) << 1); |
|
L_MPY(ftemp, mtemp); |
|
L_ADD(time_freq, ftemp); |
|
time_status &= ~STA_MODE; |
|
if (mtemp >= MINSEC && (time_status & STA_FLL || mtemp > |
|
MAXSEC)) { |
|
L_LINT(ftemp, (time_monitor << 4) / mtemp); |
|
L_RSHIFT(ftemp, SHIFT_FLL + 4); |
|
L_ADD(time_freq, ftemp); |
|
time_status |= STA_MODE; |
|
} |
|
time_reftime = time_second; |
|
if (L_GINT(time_freq) > MAXFREQ) |
|
L_LINT(time_freq, MAXFREQ); |
|
else if (L_GINT(time_freq) < -MAXFREQ) |
|
L_LINT(time_freq, -MAXFREQ); |
|
} |
|
|
|
#ifdef PPS_SYNC |
|
/* |
|
* hardpps() - discipline CPU clock oscillator to external PPS signal |
|
* |
|
* This routine is called at each PPS interrupt in order to discipline |
|
* the CPU clock oscillator to the PPS signal. It measures the PPS phase |
|
* and leaves it in a handy spot for the hardclock() routine. It |
|
* integrates successive PPS phase differences and calculates the |
|
* frequency offset. This is used in hardclock() to discipline the CPU |
|
* clock oscillator so that intrinsic frequency error is cancelled out. |
|
* The code requires the caller to capture the time and hardware counter |
|
* value at the on-time PPS signal transition. |
|
* |
|
* Note that, on some Unix systems, this routine runs at an interrupt |
|
* priority level higher than the timer interrupt routine hardclock(). |
|
* Therefore, the variables used are distinct from the hardclock() |
|
* variables, except for certain exceptions: The PPS frequency pps_freq |
|
* and phase pps_offset variables are determined by this routine and |
|
* updated atomically. The time_tolerance variable can be considered a |
|
* constant, since it is infrequently changed, and then only when the |
|
* PPS signal is disabled. The watchdog counter pps_valid is updated |
|
* once per second by hardclock() and is atomically cleared in this |
|
* routine. |
|
*/ |
|
void |
|
hardpps(struct timespec *tsp, /* time at PPS */ |
|
long nsec /* hardware counter at PPS */) |
|
{ |
|
long u_sec, u_nsec, v_nsec; /* temps */ |
|
l_fp ftemp; |
|
|
|
/* |
|
* The signal is first processed by a range gate and frequency |
|
* discriminator. The range gate rejects noise spikes outside |
|
* the range +-500 us. The frequency discriminator rejects input |
|
* signals with apparent frequency outside the range 1 +-500 |
|
* PPM. If two hits occur in the same second, we ignore the |
|
* later hit; if not and a hit occurs outside the range gate, |
|
* keep the later hit for later comparison, but do not process |
|
* it. |
|
*/ |
|
time_status |= STA_PPSSIGNAL | STA_PPSJITTER; |
|
time_status &= ~(STA_PPSWANDER | STA_PPSERROR); |
|
pps_valid = PPS_VALID; |
|
u_sec = tsp->tv_sec; |
|
u_nsec = tsp->tv_nsec; |
|
if (u_nsec >= (NANOSECOND >> 1)) { |
|
u_nsec -= NANOSECOND; |
|
u_sec++; |
|
} |
|
v_nsec = u_nsec - pps_tf[0].tv_nsec; |
|
if (u_sec == pps_tf[0].tv_sec && v_nsec < NANOSECOND - |
|
MAXFREQ) |
|
return; |
|
pps_tf[2] = pps_tf[1]; |
|
pps_tf[1] = pps_tf[0]; |
|
pps_tf[0].tv_sec = u_sec; |
|
pps_tf[0].tv_nsec = u_nsec; |
|
|
|
/* |
|
* Compute the difference between the current and previous |
|
* counter values. If the difference exceeds 0.5 s, assume it |
|
* has wrapped around, so correct 1.0 s. If the result exceeds |
|
* the tick interval, the sample point has crossed a tick |
|
* boundary during the last second, so correct the tick. Very |
|
* intricate. |
|
*/ |
|
u_nsec = nsec; |
|
if (u_nsec > (NANOSECOND >> 1)) |
|
u_nsec -= NANOSECOND; |
|
else if (u_nsec < -(NANOSECOND >> 1)) |
|
u_nsec += NANOSECOND; |
|
pps_fcount += u_nsec; |
|
if (v_nsec > MAXFREQ || v_nsec < -MAXFREQ) |
|
return; |
|
time_status &= ~STA_PPSJITTER; |
|
|
|
/* |
|
* A three-stage median filter is used to help denoise the PPS |
|
* time. The median sample becomes the time offset estimate; the |
|
* difference between the other two samples becomes the time |
|
* dispersion (jitter) estimate. |
|
*/ |
|
if (pps_tf[0].tv_nsec > pps_tf[1].tv_nsec) { |
|
if (pps_tf[1].tv_nsec > pps_tf[2].tv_nsec) { |
|
v_nsec = pps_tf[1].tv_nsec; /* 0 1 2 */ |
|
u_nsec = pps_tf[0].tv_nsec - pps_tf[2].tv_nsec; |
|
} else if (pps_tf[2].tv_nsec > pps_tf[0].tv_nsec) { |
|
v_nsec = pps_tf[0].tv_nsec; /* 2 0 1 */ |
|
u_nsec = pps_tf[2].tv_nsec - pps_tf[1].tv_nsec; |
|
} else { |
|
v_nsec = pps_tf[2].tv_nsec; /* 0 2 1 */ |
|
u_nsec = pps_tf[0].tv_nsec - pps_tf[1].tv_nsec; |
|
} |
|
} else { |
|
if (pps_tf[1].tv_nsec < pps_tf[2].tv_nsec) { |
|
v_nsec = pps_tf[1].tv_nsec; /* 2 1 0 */ |
|
u_nsec = pps_tf[2].tv_nsec - pps_tf[0].tv_nsec; |
|
} else if (pps_tf[2].tv_nsec < pps_tf[0].tv_nsec) { |
|
v_nsec = pps_tf[0].tv_nsec; /* 1 0 2 */ |
|
u_nsec = pps_tf[1].tv_nsec - pps_tf[2].tv_nsec; |
|
} else { |
|
v_nsec = pps_tf[2].tv_nsec; /* 1 2 0 */ |
|
u_nsec = pps_tf[1].tv_nsec - pps_tf[0].tv_nsec; |
|
} |
|
} |
|
|
|
/* |
|
* Nominal jitter is due to PPS signal noise and interrupt |
|
* latency. If it exceeds the popcorn threshold, the sample is |
|
* discarded. otherwise, if so enabled, the time offset is |
|
* updated. We can tolerate a modest loss of data here without |
|
* much degrading time accuracy. |
|
*/ |
|
if (u_nsec > (pps_jitter << PPS_POPCORN)) { |
|
time_status |= STA_PPSJITTER; |
|
pps_jitcnt++; |
|
} else if (time_status & STA_PPSTIME) { |
|
time_monitor = -v_nsec; |
|
L_LINT(time_offset, time_monitor); |
|
} |
|
pps_jitter += (u_nsec - pps_jitter) >> PPS_FAVG; |
|
u_sec = pps_tf[0].tv_sec - pps_lastsec; |
|
if (u_sec < (1 << pps_shift)) |
|
return; |
|
|
|
/* |
|
* At the end of the calibration interval the difference between |
|
* the first and last counter values becomes the scaled |
|
* frequency. It will later be divided by the length of the |
|
* interval to determine the frequency update. If the frequency |
|
* exceeds a sanity threshold, or if the actual calibration |
|
* interval is not equal to the expected length, the data are |
|
* discarded. We can tolerate a modest loss of data here without |
|
* much degrading frequency accuracy. |
|
*/ |
|
pps_calcnt++; |
|
v_nsec = -pps_fcount; |
|
pps_lastsec = pps_tf[0].tv_sec; |
|
pps_fcount = 0; |
|
u_nsec = MAXFREQ << pps_shift; |
|
if (v_nsec > u_nsec || v_nsec < -u_nsec || u_sec != (1 << |
|
pps_shift)) { |
|
time_status |= STA_PPSERROR; |
|
pps_errcnt++; |
|
return; |
|
} |
|
|
|
/* |
|
* Here the raw frequency offset and wander (stability) is |
|
* calculated. If the wander is less than the wander threshold |
|
* for four consecutive averaging intervals, the interval is |
|
* doubled; if it is greater than the threshold for four |
|
* consecutive intervals, the interval is halved. The scaled |
|
* frequency offset is converted to frequency offset. The |
|
* stability metric is calculated as the average of recent |
|
* frequency changes, but is used only for performance |
|
* monitoring. |
|
*/ |
|
L_LINT(ftemp, v_nsec); |
|
L_RSHIFT(ftemp, pps_shift); |
|
L_SUB(ftemp, pps_freq); |
|
u_nsec = L_GINT(ftemp); |
|
if (u_nsec > PPS_MAXWANDER) { |
|
L_LINT(ftemp, PPS_MAXWANDER); |
|
pps_intcnt--; |
|
time_status |= STA_PPSWANDER; |
|
pps_stbcnt++; |
|
} else if (u_nsec < -PPS_MAXWANDER) { |
|
L_LINT(ftemp, -PPS_MAXWANDER); |
|
pps_intcnt--; |
|
time_status |= STA_PPSWANDER; |
|
pps_stbcnt++; |
|
} else { |
|
pps_intcnt++; |
|
} |
|
if (pps_intcnt >= 4) { |
|
pps_intcnt = 4; |
|
if (pps_shift < pps_shiftmax) { |
|
pps_shift++; |
|
pps_intcnt = 0; |
|
} |
|
} else if (pps_intcnt <= -4 || pps_shift > pps_shiftmax) { |
|
pps_intcnt = -4; |
|
if (pps_shift > PPS_FAVG) { |
|
pps_shift--; |
|
pps_intcnt = 0; |
|
} |
|
} |
|
if (u_nsec < 0) |
|
u_nsec = -u_nsec; |
|
pps_stabil += (u_nsec * SCALE_PPM - pps_stabil) >> PPS_FAVG; |
|
|
|
/* |
|
* The PPS frequency is recalculated and clamped to the maximum |
|
* MAXFREQ. If enabled, the system clock frequency is updated as |
|
* well. |
|
*/ |
|
L_ADD(pps_freq, ftemp); |
|
u_nsec = L_GINT(pps_freq); |
|
if (u_nsec > MAXFREQ) |
|
L_LINT(pps_freq, MAXFREQ); |
|
else if (u_nsec < -MAXFREQ) |
|
L_LINT(pps_freq, -MAXFREQ); |
|
if (time_status & STA_PPSFREQ) |
|
time_freq = pps_freq; |
|
} |
|
#endif /* PPS_SYNC */ |
|
#endif /* NTP */ |
|
#else /* !__HAVE_TIMECOUNTER */ |
/****************************************************************************** |
/****************************************************************************** |
* * |
* * |
* Copyright (c) David L. Mills 1993, 1994 * |
* Copyright (c) David L. Mills 1993, 1994 * |
|
|
__KERNEL_RCSID(0, "$NetBSD$"); |
__KERNEL_RCSID(0, "$NetBSD$"); |
|
|
#include "opt_ntp.h" |
#include "opt_ntp.h" |
|
#include "opt_compat_netbsd.h" |
|
|
#include <sys/param.h> |
#include <sys/param.h> |
#include <sys/resourcevar.h> |
#include <sys/resourcevar.h> |
Line 61 __KERNEL_RCSID(0, "$NetBSD$"); |
|
Line 915 __KERNEL_RCSID(0, "$NetBSD$"); |
|
#include <sys/proc.h> |
#include <sys/proc.h> |
#include <sys/sysctl.h> |
#include <sys/sysctl.h> |
#include <sys/timex.h> |
#include <sys/timex.h> |
|
#ifdef COMPAT_30 |
|
#include <compat/sys/timex.h> |
|
#endif |
#include <sys/vnode.h> |
#include <sys/vnode.h> |
|
#include <sys/kauth.h> |
|
|
#include <sys/mount.h> |
#include <sys/mount.h> |
#include <sys/sa.h> |
#include <sys/sa.h> |
Line 104 extern long pps_stbcnt; /* stability li |
|
Line 962 extern long pps_stbcnt; /* stability li |
|
/* |
/* |
* ntp_gettime() - NTP user application interface |
* ntp_gettime() - NTP user application interface |
*/ |
*/ |
int |
void |
sys_ntp_gettime(l, v, retval) |
ntp_gettime(ntvp) |
struct lwp *l; |
struct ntptimeval *ntvp; |
void *v; |
|
register_t *retval; |
|
|
|
{ |
{ |
struct sys_ntp_gettime_args /* { |
|
syscallarg(struct ntptimeval *) ntvp; |
|
} */ *uap = v; |
|
struct timeval atv; |
struct timeval atv; |
struct ntptimeval ntv; |
|
int error = 0; |
|
int s; |
int s; |
|
|
if (SCARG(uap, ntvp)) { |
memset(ntvp, 0, sizeof(struct ntptimeval)); |
s = splclock(); |
|
|
s = splclock(); |
#ifdef EXT_CLOCK |
#ifdef EXT_CLOCK |
/* |
/* |
* The microtime() external clock routine returns a |
* The microtime() external clock routine returns a |
* status code. If less than zero, we declare an error |
* status code. If less than zero, we declare an error |
* in the clock status word and return the kernel |
* in the clock status word and return the kernel |
* (software) time variable. While there are other |
* (software) time variable. While there are other |
* places that call microtime(), this is the only place |
* places that call microtime(), this is the only place |
* that matters from an application point of view. |
* that matters from an application point of view. |
*/ |
*/ |
if (microtime(&atv) < 0) { |
if (microtime(&atv) < 0) { |
time_status |= STA_CLOCKERR; |
time_status |= STA_CLOCKERR; |
ntv.time = time; |
ntvp->time = time; |
} else |
} else |
time_status &= ~STA_CLOCKERR; |
time_status &= ~STA_CLOCKERR; |
#else /* EXT_CLOCK */ |
#else /* EXT_CLOCK */ |
microtime(&atv); |
microtime(&atv); |
#endif /* EXT_CLOCK */ |
#endif /* EXT_CLOCK */ |
ntv.time = atv; |
ntvp->maxerror = time_maxerror; |
ntv.maxerror = time_maxerror; |
ntvp->esterror = time_esterror; |
ntv.esterror = time_esterror; |
(void) splx(s); |
(void) splx(s); |
TIMEVAL_TO_TIMESPEC(&atv, &ntvp->time); |
|
|
error = copyout((caddr_t)&ntv, (caddr_t)SCARG(uap, ntvp), |
|
sizeof(ntv)); |
|
} |
|
if (!error) { |
|
|
|
/* |
|
* Status word error decode. If any of these conditions |
|
* occur, an error is returned, instead of the status |
|
* word. Most applications will care only about the fact |
|
* the system clock may not be trusted, not about the |
|
* details. |
|
* |
|
* Hardware or software error |
|
*/ |
|
if ((time_status & (STA_UNSYNC | STA_CLOCKERR)) || |
|
|
|
/* |
|
* PPS signal lost when either time or frequency |
|
* synchronization requested |
|
*/ |
|
(time_status & (STA_PPSFREQ | STA_PPSTIME) && |
|
!(time_status & STA_PPSSIGNAL)) || |
|
|
|
/* |
|
* PPS jitter exceeded when time synchronization |
|
* requested |
|
*/ |
|
(time_status & STA_PPSTIME && |
|
time_status & STA_PPSJITTER) || |
|
|
|
/* |
|
* PPS wander exceeded or calibration error when |
|
* frequency synchronization requested |
|
*/ |
|
(time_status & STA_PPSFREQ && |
|
time_status & (STA_PPSWANDER | STA_PPSERROR))) |
|
*retval = TIME_ERROR; |
|
else |
|
*retval = (register_t)time_state; |
|
} |
|
return(error); |
|
} |
} |
|
|
|
|
/* ARGSUSED */ |
/* ARGSUSED */ |
/* |
/* |
Line 207 sys_ntp_adjtime(l, v, retval) |
|
Line 1017 sys_ntp_adjtime(l, v, retval) |
|
sizeof(ntv))) != 0) |
sizeof(ntv))) != 0) |
return (error); |
return (error); |
|
|
if (ntv.modes != 0 && (error = suser(p->p_ucred, &p->p_acflag)) != 0) |
if (ntv.modes != 0 && (error = kauth_authorize_generic(p->p_cred, |
|
KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) |
return (error); |
return (error); |
|
|
return (ntp_adjtime1(&ntv, v, retval)); |
ntp_adjtime1(&ntv); |
|
|
|
error = copyout((caddr_t)&ntv, (caddr_t)SCARG(uap, tp), sizeof(ntv)); |
|
|
|
if (error == 0) { |
|
*retval = ntp_timestatus(); |
|
} |
|
|
|
return error; |
} |
} |
|
|
int |
void |
ntp_adjtime1(ntv, v, retval) |
ntp_adjtime1(ntv) |
struct timex *ntv; |
struct timex *ntv; |
void *v; |
|
register_t *retval; |
|
{ |
{ |
struct sys_ntp_adjtime_args /* { |
|
syscallarg(struct timex *) tp; |
|
} */ *uap = v; |
|
int error = 0; |
|
int modes; |
int modes; |
int s; |
int s; |
|
|
Line 284 ntp_adjtime1(ntv, v, retval) |
|
Line 1097 ntp_adjtime1(ntv, v, retval) |
|
ntv->stbcnt = pps_stbcnt; |
ntv->stbcnt = pps_stbcnt; |
#endif /* PPS_SYNC */ |
#endif /* PPS_SYNC */ |
(void)splx(s); |
(void)splx(s); |
|
|
error = copyout((caddr_t)ntv, (caddr_t)SCARG(uap, tp), sizeof(*ntv)); |
|
if (!error) { |
|
|
|
/* |
|
* Status word error decode. See comments in |
|
* ntp_gettime() routine. |
|
*/ |
|
if ((time_status & (STA_UNSYNC | STA_CLOCKERR)) || |
|
(time_status & (STA_PPSFREQ | STA_PPSTIME) && |
|
!(time_status & STA_PPSSIGNAL)) || |
|
(time_status & STA_PPSTIME && |
|
time_status & STA_PPSJITTER) || |
|
(time_status & STA_PPSFREQ && |
|
time_status & (STA_PPSWANDER | STA_PPSERROR))) |
|
*retval = TIME_ERROR; |
|
else |
|
*retval = (register_t)time_state; |
|
} |
|
return error; |
|
} |
} |
|
#endif /* NTP */ |
|
#endif /* !__HAVE_TIMECOUNTER */ |
|
|
/* |
#ifdef NTP |
* return information about kernel precision timekeeping |
int |
*/ |
ntp_timestatus() |
static int |
|
sysctl_kern_ntptime(SYSCTLFN_ARGS) |
|
{ |
{ |
struct sysctlnode node; |
|
struct timeval atv; |
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struct ntptimeval ntv; |
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int s; |
|
|
|
/* |
|
* Construct ntp_timeval. |
|
*/ |
|
|
|
s = splclock(); |
|
#ifdef EXT_CLOCK |
|
/* |
|
* The microtime() external clock routine returns a |
|
* status code. If less than zero, we declare an error |
|
* in the clock status word and return the kernel |
|
* (software) time variable. While there are other |
|
* places that call microtime(), this is the only place |
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* that matters from an application point of view. |
|
*/ |
|
if (microtime(&atv) < 0) { |
|
time_status |= STA_CLOCKERR; |
|
ntv.time = time; |
|
} else { |
|
time_status &= ~STA_CLOCKERR; |
|
} |
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#else /* EXT_CLOCK */ |
|
microtime(&atv); |
|
#endif /* EXT_CLOCK */ |
|
ntv.time = atv; |
|
ntv.maxerror = time_maxerror; |
|
ntv.esterror = time_esterror; |
|
splx(s); |
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|
|
#ifdef notyet |
|
/* |
/* |
* Status word error decode. If any of these conditions |
* Status word error decode. If any of these conditions |
* occur, an error is returned, instead of the status |
* occur, an error is returned, instead of the status |
Line 356 sysctl_kern_ntptime(SYSCTLFN_ARGS) |
|
Line 1115 sysctl_kern_ntptime(SYSCTLFN_ARGS) |
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* Hardware or software error |
* Hardware or software error |
*/ |
*/ |
if ((time_status & (STA_UNSYNC | STA_CLOCKERR)) || |
if ((time_status & (STA_UNSYNC | STA_CLOCKERR)) || |
ntv.time_state = TIME_ERROR; |
|
|
|
/* |
/* |
* PPS signal lost when either time or frequency |
* PPS signal lost when either time or frequency |
* synchronization requested |
* synchronization requested |
*/ |
*/ |
(time_status & (STA_PPSFREQ | STA_PPSTIME) && |
(time_status & (STA_PPSFREQ | STA_PPSTIME) && |
!(time_status & STA_PPSSIGNAL)) || |
!(time_status & STA_PPSSIGNAL)) || |
|
|
/* |
/* |
* PPS jitter exceeded when time synchronization |
* PPS jitter exceeded when time synchronization |
* requested |
* requested |
*/ |
*/ |
(time_status & STA_PPSTIME && |
(time_status & STA_PPSTIME && |
time_status & STA_PPSJITTER) || |
time_status & STA_PPSJITTER) || |
|
|
/* |
/* |
* PPS wander exceeded or calibration error when |
* PPS wander exceeded or calibration error when |
* frequency synchronization requested |
* frequency synchronization requested |
*/ |
*/ |
(time_status & STA_PPSFREQ && |
(time_status & STA_PPSFREQ && |
time_status & (STA_PPSWANDER | STA_PPSERROR))) |
time_status & (STA_PPSWANDER | STA_PPSERROR))) |
ntv.time_state = TIME_ERROR; |
return (TIME_ERROR); |
else |
else |
ntv.time_state = time_state; |
return (time_state); |
#endif /* notyet */ |
} |
|
|
|
/*ARGSUSED*/ |
|
/* |
|
* ntp_gettime() - NTP user application interface |
|
*/ |
|
int |
|
sys___ntp_gettime30(l, v, retval) |
|
struct lwp *l; |
|
void *v; |
|
register_t *retval; |
|
{ |
|
struct sys___ntp_gettime30_args /* { |
|
syscallarg(struct ntptimeval *) ntvp; |
|
} */ *uap = v; |
|
struct ntptimeval ntv; |
|
int error = 0; |
|
|
|
if (SCARG(uap, ntvp)) { |
|
ntp_gettime(&ntv); |
|
|
|
error = copyout((caddr_t)&ntv, (caddr_t)SCARG(uap, ntvp), |
|
sizeof(ntv)); |
|
} |
|
if (!error) { |
|
*retval = ntp_timestatus(); |
|
} |
|
return(error); |
|
} |
|
|
|
#ifdef COMPAT_30 |
|
int |
|
compat_30_sys_ntp_gettime(l, v, retval) |
|
struct lwp *l; |
|
void *v; |
|
register_t *retval; |
|
{ |
|
struct compat_30_sys_ntp_gettime_args /* { |
|
syscallarg(struct ntptimeval30 *) ontvp; |
|
} */ *uap = v; |
|
struct ntptimeval ntv; |
|
struct ntptimeval30 ontv; |
|
int error = 0; |
|
|
|
if (SCARG(uap, ntvp)) { |
|
ntp_gettime(&ntv); |
|
TIMESPEC_TO_TIMEVAL(&ontv.time, &ntv.time); |
|
ontv.maxerror = ntv.maxerror; |
|
ontv.esterror = ntv.esterror; |
|
|
|
error = copyout((caddr_t)&ontv, (caddr_t)SCARG(uap, ntvp), |
|
sizeof(ontv)); |
|
} |
|
if (!error) |
|
*retval = ntp_timestatus(); |
|
|
|
return (error); |
|
} |
|
#endif |
|
|
|
/* |
|
* return information about kernel precision timekeeping |
|
*/ |
|
static int |
|
sysctl_kern_ntptime(SYSCTLFN_ARGS) |
|
{ |
|
struct sysctlnode node; |
|
struct ntptimeval ntv; |
|
|
|
ntp_gettime(&ntv); |
|
|
node = *rnode; |
node = *rnode; |
node.sysctl_data = &ntv; |
node.sysctl_data = &ntv; |
Line 410 SYSCTL_SETUP(sysctl_kern_ntptime_setup, |
|
Line 1237 SYSCTL_SETUP(sysctl_kern_ntptime_setup, |
|
/* For some reason, raising SIGSYS (as sys_nosys would) is problematic. */ |
/* For some reason, raising SIGSYS (as sys_nosys would) is problematic. */ |
|
|
int |
int |
sys_ntp_gettime(l, v, retval) |
sys___ntp_gettime30(l, v, retval) |
struct lwp *l; |
struct lwp *l; |
void *v; |
void *v; |
register_t *retval; |
register_t *retval; |
Line 418 sys_ntp_gettime(l, v, retval) |
|
Line 1245 sys_ntp_gettime(l, v, retval) |
|
|
|
return(ENOSYS); |
return(ENOSYS); |
} |
} |
|
|
|
#ifdef COMPAT_30 |
|
int |
|
compat_30_sys_ntp_gettime(l, v, retval) |
|
struct lwp *l; |
|
void *v; |
|
register_t *retval; |
|
{ |
|
|
|
return(ENOSYS); |
|
} |
|
#endif |
#endif /* !NTP */ |
#endif /* !NTP */ |