1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) David L. Mills 1993, 1994
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* copyright notice and this permission notice appear in supporting
* documentation, and that the name University of Delaware not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The University of Delaware
* makes no representations about the suitability this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/*
* Copyright 2021 OmniOS Community Edition (OmniOSce) Association.
*/
/*
* Modification history kern_ntptime.c
*
* 24 Sep 94 David L. Mills
* Tightened code at exits.
*
* 24 Mar 94 David L. Mills
* Revised syscall interface to include new variables for PPS
* time discipline.
*
* 14 Feb 94 David L. Mills
* Added code for external clock
*
* 28 Nov 93 David L. Mills
* Revised frequency scaling to conform with adjusted parameters
*
* 17 Sep 93 David L. Mills
* Created file
*/
/*
* ntp_gettime(), ntp_adjtime() - precision time interface
*
* These routines consitute the Network Time Protocol (NTP) interfaces
* for user and daemon application programs. The ntp_gettime() routine
* provides the time, maximum error (synch distance) and estimated error
* (dispersion) to client user application programs. The ntp_adjtime()
* routine is used by the NTP daemon to adjust the system clock to an
* externally derived time. The time offset and related variables set by
* this routine are used by clock() to adjust the phase and
* frequency of the phase-lock loop which controls the system clock.
*/
#include <sys/param.h>
#include <sys/user.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/kmem.h>
#include <sys/cmn_err.h>
#include <sys/cpuvar.h>
#include <sys/timer.h>
#include <sys/debug.h>
#include <sys/timex.h>
#include <sys/model.h>
#include <sys/policy.h>
/*
* ntp_gettime() - NTP user application interface
*/
int
ntp_gettime(struct ntptimeval *tp)
{
timestruc_t tod;
struct ntptimeval ntv;
model_t datamodel = get_udatamodel();
gethrestime(&tod);
if (tod.tv_sec > TIME32_MAX)
return (set_errno(EOVERFLOW));
ntv.time.tv_sec = tod.tv_sec;
ntv.time.tv_usec = tod.tv_nsec / (NANOSEC / MICROSEC);
ntv.maxerror = time_maxerror;
ntv.esterror = time_esterror;
if (datamodel == DATAMODEL_NATIVE) {
if (copyout(&ntv, tp, sizeof (ntv)))
return (set_errno(EFAULT));
} else {
struct ntptimeval32 ntv32;
if (TIMEVAL_OVERFLOW(&ntv.time))
return (set_errno(EOVERFLOW));
TIMEVAL_TO_TIMEVAL32(&ntv32.time, &ntv.time);
ntv32.maxerror = ntv.maxerror;
ntv32.esterror = ntv.esterror;
if (copyout(&ntv32, tp, sizeof (ntv32)))
return (set_errno(EFAULT));
}
/*
* 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))) {
return (TIME_ERROR);
}
return (time_state);
}
/*
* ntp_adjtime() - NTP daemon application interface
*/
int
ntp_adjtime(struct timex *tp)
{
struct timex ntv;
int modes;
if (copyin(tp, &ntv, sizeof (ntv)))
return (set_errno(EFAULT));
/*
* Update selected clock variables - only privileged users can
* change anything. Note that there is no error checking here on
* the assumption privileged users know what they're doing.
*/
modes = ntv.modes;
if (modes != 0 && secpolicy_settime(CRED()) != 0)
return (set_errno(EPERM));
/*
* If the time constant is being set, validate it first so that
* no changes are made if it is out of range.
*/
if ((modes & MOD_TIMECONST) && (ntv.constant < 0 || ntv.constant > 30))
return (set_errno(EINVAL));
mutex_enter(&tod_lock);
if (modes & MOD_MAXERROR)
time_maxerror = ntv.maxerror;
if (modes & MOD_ESTERROR)
time_esterror = ntv.esterror;
if (modes & MOD_STATUS) {
time_status &= STA_RONLY;
time_status |= ntv.status & ~STA_RONLY;
}
if (modes & MOD_TIMECONST)
time_constant = ntv.constant;
if (modes & MOD_OFFSET)
clock_update(ntv.offset);
/*
* clock_update() updates time_freq so keep MOD_FREQUENCY after
* MOD_OFFSET.
*/
if (modes & MOD_FREQUENCY)
time_freq = ntv.freq - pps_freq;
/*
* Retrieve all clock variables
*/
ntv.offset = time_offset / SCALE_UPDATE;
ntv.freq = time_freq + pps_freq;
ntv.maxerror = time_maxerror;
ntv.esterror = time_esterror;
ntv.status = time_status;
ntv.constant = time_constant;
ntv.precision = time_precision;
ntv.tolerance = time_tolerance;
ntv.shift = pps_shift;
ntv.ppsfreq = pps_freq;
ntv.jitter = pps_jitter >> PPS_AVG;
ntv.stabil = pps_stabil;
ntv.calcnt = pps_calcnt;
ntv.errcnt = pps_errcnt;
ntv.jitcnt = pps_jitcnt;
ntv.stbcnt = pps_stbcnt;
mutex_exit(&tod_lock);
if (copyout(&ntv, tp, sizeof (ntv)))
return (set_errno(EFAULT));
/*
* 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)))
return (TIME_ERROR);
return (time_state);
}
|
