Integrate the new "nanokernel" PLL from Dave Mills.
This code is backwards compatible with the older "microkernel" PLL, but allows ntpd v4 to use nanosecond resolution. Many other improvements. PPS_SYNC and hardpps() are NOT supported yet.
This commit is contained in:
Poul-Henning Kamp
parent
8d30de0d26
commit
c68996e271
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=44574
@ -37,7 +37,7 @@
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* SUCH DAMAGE.
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*
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* @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
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* $Id: kern_clock.c,v 1.87 1999/02/19 14:25:34 luoqi Exp $
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* $Id: kern_clock.c,v 1.88 1999/02/19 19:34:49 luoqi Exp $
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*/
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#include <sys/param.h>
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@ -675,10 +675,7 @@ tco_setscales(struct timecounter *tc)
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u_int64_t scale;
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scale = 1000000000LL << 32;
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if (tc->tc_adjustment > 0)
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scale += (tc->tc_adjustment * 1000LL) << 10;
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else
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scale -= (-tc->tc_adjustment * 1000LL) << 10;
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scale += tc->tc_adjustment;
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scale /= tc->tc_frequency;
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tc->tc_scale_micro = scale / 1000;
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tc->tc_scale_nano_f = scale & 0xffffffff;
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File diff suppressed because it is too large
Load Diff
@ -37,7 +37,7 @@
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* SUCH DAMAGE.
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*
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* @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
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* $Id: kern_clock.c,v 1.87 1999/02/19 14:25:34 luoqi Exp $
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* $Id: kern_clock.c,v 1.88 1999/02/19 19:34:49 luoqi Exp $
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*/
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#include <sys/param.h>
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@ -675,10 +675,7 @@ tco_setscales(struct timecounter *tc)
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u_int64_t scale;
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scale = 1000000000LL << 32;
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if (tc->tc_adjustment > 0)
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scale += (tc->tc_adjustment * 1000LL) << 10;
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else
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scale -= (-tc->tc_adjustment * 1000LL) << 10;
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scale += tc->tc_adjustment;
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scale /= tc->tc_frequency;
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tc->tc_scale_micro = scale / 1000;
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tc->tc_scale_nano_f = scale & 0xffffffff;
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)time.h 8.5 (Berkeley) 5/4/95
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* $Id: time.h,v 1.34 1998/10/23 10:42:42 phk Exp $
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* $Id: time.h,v 1.35 1998/12/15 17:38:32 des Exp $
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*/
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#ifndef _SYS_TIME_H_
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@ -141,7 +141,7 @@ struct timecounter {
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char *tc_name;
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void *tc_priv;
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/* These fields will be managed by the generic code. */
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int32_t tc_adjustment;
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int64_t tc_adjustment;
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u_int32_t tc_scale_micro;
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u_int32_t tc_scale_nano_i;
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u_int32_t tc_scale_nano_f;
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)time.h 8.5 (Berkeley) 5/4/95
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* $Id: time.h,v 1.34 1998/10/23 10:42:42 phk Exp $
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* $Id: time.h,v 1.35 1998/12/15 17:38:32 des Exp $
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*/
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#ifndef _SYS_TIME_H_
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@ -141,7 +141,7 @@ struct timecounter {
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char *tc_name;
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void *tc_priv;
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/* These fields will be managed by the generic code. */
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int32_t tc_adjustment;
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int64_t tc_adjustment;
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u_int32_t tc_scale_micro;
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u_int32_t tc_scale_nano_i;
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u_int32_t tc_scale_nano_f;
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297
sys/sys/timex.h
297
sys/sys/timex.h
@ -1,22 +1,27 @@
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/******************************************************************************
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* *
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* Copyright (c) David L. Mills 1993, 1994 *
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* *
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* Permission to use, copy, modify, and distribute this software and its *
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* documentation for any purpose and without fee is hereby granted, provided *
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* that the above copyright notice appears in all copies and that both the *
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* copyright notice and this permission notice appear in supporting *
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* documentation, and that the name University of Delaware not be used in *
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* advertising or publicity pertaining to distribution of the software *
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* without specific, written prior permission. The University of Delaware *
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* makes no representations about the suitability this software for any *
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* purpose. It is provided "as is" without express or implied warranty. *
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* *
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******************************************************************************/
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/***********************************************************************
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* *
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* Copyright (c) David L. Mills 1993-1998 *
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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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* Modification history timex.h
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*
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* 17 Nov 98 David L. Mills
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* Revised for nanosecond kernel and user interface.
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*
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* 26 Sep 94 David L. Mills
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* Added defines for hybrid phase/frequency-lock loop.
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*
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@ -38,31 +43,50 @@
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/*
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* This header file defines the Network Time Protocol (NTP) interfaces
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* for user and daemon application programs. These are implemented using
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* private syscalls and data structures and require specific kernel
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* defined syscalls and data structures and require specific kernel
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* support.
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*
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* The original precision time kernels developed from 1993 have an
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* ultimate resolution of one microsecond; however, the most recent
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* kernels have an ultimate resolution of one nanosecond. In these
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* kernels, a ntp_adjtime() syscalls can be used to determine which
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* resolution is in use and to select either one at any time. The
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* resolution selected affects the scaling of certain fields in the
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* ntp_gettime() and ntp_adjtime() syscalls, as described below.
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*
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* NAME
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* ntp_gettime - NTP user application interface
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*
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* SYNOPSIS
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* #include <sys/timex.h>
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* #include <sys/syscall.h>
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*
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* int syscall(SYS_ntp_gettime, tptr)
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* int syscall(SYS_ntp_gettime, tptr);
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* int SYS_ntp_gettime;
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* struct ntptimeval *tptr;
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*
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* int SYS_ntp_gettime defined in syscall.h header file
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* struct ntptimeval *tptr pointer to ntptimeval structure
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* DESCRIPTION
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* The time returned by ntp_gettime() is in a timeval structure,
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* but may be in either microsecond (seconds and microseconds) or
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* nanosecond (seconds and nanoseconds) format. The particular
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* format in use is determined by the STA_NANO bit of the status
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* word returned by the ntp_adjtime() syscall.
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*
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* NAME
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* ntp_adjtime - NTP daemon application interface
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*
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* SYNOPSIS
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* #include <sys/timex.h>
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* #include <sys/syscall.h>
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*
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* int syscall(SYS_ntp_adjtime, mode, tptr)
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*
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* int SYS_ntp_adjtime defined in syscall.h header file
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* struct timex *tptr pointer to timex structure
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* int syscall(SYS_ntp_adjtime, tptr);
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* struct timex *tptr;
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*
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* DESCRIPTION
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* Certain fields of the timex structure are interpreted in either
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* microseconds or nanoseconds according to the state of the
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* STA_NANO bit in the status word. See the description below for
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* further information.
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*/
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#ifndef _SYS_TIMEX_H_
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#define _SYS_TIMEX_H_ 1
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@ -72,138 +96,40 @@
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#endif /* MSDOS */
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/*
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* The following defines establish the engineering parameters of the
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* phase-lock loop (PLL) model used in the kernel implementation. These
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* parameters have been carefully chosen by analysis for good stability
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* and wide dynamic range.
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*
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* The hz variable is defined in the kernel build environment. It
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* establishes the timer interrupt frequency, 100 Hz for the SunOS
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* kernel, 256 Hz for the Ultrix kernel and 1024 Hz for the OSF/1
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* kernel. SHIFT_HZ expresses the same value as the nearest power of two
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* in order to avoid hardware multiply operations.
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*
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* SHIFT_KG and SHIFT_KF establish the damping of the PLL and are chosen
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* for a slightly underdamped convergence characteristic. SHIFT_KH
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* establishes the damping of the FLL and is chosen by wisdom and black
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* art.
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*
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* MAXTC establishes the maximum time constant of the PLL. With the
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* SHIFT_KG and SHIFT_KF values given and a time constant range from
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* zero to MAXTC, the PLL will converge in 15 minutes to 16 hours,
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* respectively.
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* The following defines establish the performance envelope of the
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* kernel discipline loop. Phase or frequency errors greater than
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* NAXPHASE or MAXFREQ are clamped to these maxima. For update intervals
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* less than MINSEC, the loop always operates in PLL mode; while, for
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* update intervals greater than MAXSEC, the loop always operates in FLL
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* mode. Between these two limits the operating mode is selected by the
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* STA_FLL bit in the status word.
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*/
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#define SHIFT_HZ 7 /* log2(hz) */
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#define SHIFT_KG 6 /* phase factor (shift) */
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#define SHIFT_KF 16 /* PLL frequency factor (shift) */
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#define SHIFT_KH 2 /* FLL frequency factor (shift) */
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#define MAXTC 6 /* maximum time constant (shift) */
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/*
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* The following defines establish the scaling of the various variables
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* used by the PLL. They are chosen to allow the greatest precision
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* possible without overflow of a 32-bit word.
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*
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* SHIFT_SCALE defines the scaling (shift) of the time_phase variable,
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* which serves as a an extension to the low-order bits of the system
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* clock variable time.tv_usec.
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*
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* SHIFT_UPDATE defines the scaling (shift) of the time_offset variable,
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* which represents the current time offset with respect to standard
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* time.
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*
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* SHIFT_USEC defines the scaling (shift) of the time_freq and
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* time_tolerance variables, which represent the current frequency
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* offset and maximum frequency tolerance.
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*
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* FINEUSEC is 1 us in SHIFT_UPDATE units of the time_phase variable.
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*/
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#define SHIFT_SCALE 22 /* phase scale (shift) */
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#define SHIFT_UPDATE (SHIFT_KG + MAXTC) /* time offset scale (shift) */
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#define SHIFT_USEC 16 /* frequency offset scale (shift) */
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#define FINEUSEC (1L << SHIFT_SCALE) /* 1 us in phase units */
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/*
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* The following defines establish the performance envelope of the PLL.
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* They insure it operates within predefined limits, in order to satisfy
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* correctness assertions. An excursion which exceeds these bounds is
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* clamped to the bound and operation proceeds accordingly. In practice,
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* this can occur only if something has failed or is operating out of
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* tolerance, but otherwise the PLL continues to operate in a stable
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* mode.
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*
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* MAXPHASE must be set greater than or equal to CLOCK.MAX (128 ms), as
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* defined in the NTP specification. CLOCK.MAX establishes the maximum
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* time offset allowed before the system time is reset, rather than
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* incrementally adjusted. Here, the maximum offset is clamped to
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* MAXPHASE only in order to prevent overflow errors due to defective
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* protocol implementations.
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*
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* MAXFREQ is the maximum frequency tolerance of the CPU clock
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* oscillator plus the maximum slew rate allowed by the protocol. It
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* should be set to at least the frequency tolerance of the oscillator
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* plus 100 ppm for vernier frequency adjustments. If the kernel
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* PPS discipline code is configured (PPS_SYNC), the oscillator time and
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* frequency are disciplined to an external source, presumably with
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* negligible time and frequency error relative to UTC, and MAXFREQ can
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* be reduced.
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*
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* MAXTIME is the maximum jitter tolerance of the PPS signal if the
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* kernel PPS discipline code is configured (PPS_SYNC).
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*
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* MINSEC and MAXSEC define the lower and upper bounds on the interval
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* between protocol updates.
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*/
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#define MAXPHASE 512000L /* max phase error (us) */
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#ifdef PPS_SYNC
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#define MAXFREQ (512L << SHIFT_USEC) /* max freq error (100 ppm) */
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#define MAXTIME (200L << PPS_AVG) /* max PPS error (jitter) (200 us) */
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#else
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#define MAXFREQ (512L << SHIFT_USEC) /* max freq error (200 ppm) */
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#endif /* PPS_SYNC */
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#define MINSEC 16L /* min interval between updates (s) */
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#define MAXSEC 1200L /* max interval between updates (s) */
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/*
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* The following defines are used only if a pulse-per-second (PPS)
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* signal is available and connected via a modem control lead, such as
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* produced by the optional ppsclock feature incorporated in the Sun
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* asynch driver. They establish the design parameters of the frequency-
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* lock loop used to discipline the CPU clock oscillator to the PPS
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* signal.
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*
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* PPS_AVG is the averaging factor for the frequency loop, as well as
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* the time and frequency dispersion.
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*
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* PPS_SHIFT and PPS_SHIFTMAX specify the minimum and maximum
|
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* calibration intervals, respectively, in seconds as a power of two.
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*
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* PPS_VALID is the maximum interval before the PPS signal is considered
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* invalid and protocol updates used directly instead.
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*
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* MAXGLITCH is the maximum interval before a time offset of more than
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* MAXTIME is believed.
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*/
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#define PPS_AVG 2 /* pps averaging constant (shift) */
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#define PPS_SHIFT 2 /* min interval duration (s) (shift) */
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#define PPS_SHIFTMAX 8 /* max interval duration (s) (shift) */
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#define PPS_VALID 120 /* pps signal watchdog max (s) */
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#define MAXGLITCH 30 /* pps signal glitch max (s) */
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#define MAXPHASE 500000000L /* max phase error (ns) */
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#define MAXFREQ 500000L /* max freq error (ns/s) */
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#define MINSEC 256 /* min FLL update interval (s) */
|
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#define MAXSEC 1600 /* max PLL update interval (s) */
|
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#define NANOSECOND 1000000000L /* nanoseconds in one second */
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#define SCALE_PPM (65536 / 1000) /* crude ns/s to scaled PPM */
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#define MAXTC 10 /* max time constant in PLL mode */
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|
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/*
|
||||
* The following defines and structures define the user interface for
|
||||
* the ntp_gettime() and ntp_adjtime() system calls.
|
||||
* the ntp_gettime() and ntp_adjtime() syscalls.
|
||||
*
|
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* Control mode codes (timex.modes)
|
||||
* Control mode codes (timex.modes and nanotimex.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 */
|
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#define MOD_CANSCALE 0x0040 /* kernel can scale offset field */
|
||||
#define MOD_DOSCALE 0x0080 /* userland wants to scale offset field */
|
||||
#define MOD_TIMECONST 0x0020 /* set PLL time constant */
|
||||
#define MOD_PLL 0x0400 /* select default PLL mode */
|
||||
#define MOD_FLL 0x0800 /* select default FLL mode */
|
||||
#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)
|
||||
@ -211,22 +137,22 @@
|
||||
#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 /* select frequency-lock mode (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) /* read-only bits */
|
||||
STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)
|
||||
|
||||
/*
|
||||
* Clock states (time_state)
|
||||
@ -236,74 +162,65 @@
|
||||
#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 /* clock not synchronized */
|
||||
#define TIME_ERROR 5 /* error (see status word) */
|
||||
|
||||
/*
|
||||
* NTP user interface (ntp_gettime()) - used to read kernel clock values
|
||||
*
|
||||
* Note: maximum error = NTP synch distance = dispersion + delay / 2;
|
||||
* estimated error = NTP dispersion.
|
||||
* Note: The time member is in microseconds if STA_NANO is zero and
|
||||
* nanoseconds if not.
|
||||
*/
|
||||
struct ntptimeval {
|
||||
struct timeval time; /* current time (ro) */
|
||||
struct timespec time; /* current time (ns) (ro) */
|
||||
long maxerror; /* maximum error (us) (ro) */
|
||||
long esterror; /* estimated error (us) (ro) */
|
||||
int time_state; /* what ntp_gettime returns */
|
||||
int time_state; /* time status */
|
||||
};
|
||||
|
||||
/*
|
||||
* NTP daemon interface - (ntp_adjtime()) used to discipline CPU clock
|
||||
* oscillator
|
||||
* 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 (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; /* pll time constant (rw) */
|
||||
long precision; /* clock precision (us) (ro) */
|
||||
long tolerance; /* clock frequency tolerance (scaled
|
||||
* ppm) (ro) */
|
||||
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.
|
||||
* kernel. They are included in all configurations to insure
|
||||
* portability.
|
||||
*/
|
||||
long ppsfreq; /* pps frequency (scaled ppm) (ro) */
|
||||
long jitter; /* pps jitter (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) */
|
||||
|
||||
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__
|
||||
|
||||
/*
|
||||
* sysctl identifiers underneath kern.ntp_pll
|
||||
*/
|
||||
#define NTP_PLL_GETTIME 1 /* used by ntp_gettime() */
|
||||
#define NTP_PLL_MAXID 2 /* number of valid ids */
|
||||
|
||||
#define NTP_PLL_NAMES { \
|
||||
{ 0, 0 }, \
|
||||
{ "gettime", CTLTYPE_STRUCT }, \
|
||||
}
|
||||
|
||||
#ifdef KERNEL
|
||||
void ntp_update_second __P((struct timecounter *tc));
|
||||
extern long time_phase;
|
||||
extern long time_adj;
|
||||
#else
|
||||
#include <sys/cdefs.h>
|
||||
|
||||
__BEGIN_DECLS
|
||||
extern int ntp_gettime __P((struct ntptimeval *));
|
||||
extern int ntp_adjtime __P((struct timex *));
|
||||
extern int ntp_gettime __P((struct ntptimeval *));
|
||||
extern int ntp_adjtime __P((struct timex *));
|
||||
__END_DECLS
|
||||
|
||||
#endif /* not KERNEL */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user