1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */
28 /* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */
29 /* All Rights Reserved */
30
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #include <sys/systm.h>
34 #include <sys/archsystm.h>
35 #include <sys/lockstat.h>
36
37 #include <sys/clock.h>
38 #include <sys/debug.h>
39 #include <sys/smp_impldefs.h>
40 #include <sys/rtc.h>
41
42 /*
43 * This file contains all generic part of clock and timer handling.
44 * Specifics are now in separate files and may be overridden by TOD
45 * modules.
46 */
47
48 char *tod_module_name; /* Settable in /etc/system */
49
50 extern void tod_set_prev(timestruc_t);
51
52 /*
53 * Write the specified time into the clock chip.
54 * Must be called with tod_lock held.
55 */
56 void
tod_set(timestruc_t ts)57 tod_set(timestruc_t ts)
58 {
59 ASSERT(MUTEX_HELD(&tod_lock));
60
61 tod_set_prev(ts); /* for tod_validate() */
62 TODOP_SET(tod_ops, ts);
63 tod_status_set(TOD_SET_DONE); /* TOD was modified */
64 }
65
66 /*
67 * Read the current time from the clock chip and convert to UNIX form.
68 * Assumes that the year in the clock chip is valid.
69 * Must be called with tod_lock held.
70 */
71 timestruc_t
tod_get(void)72 tod_get(void)
73 {
74 timestruc_t ts;
75
76 ASSERT(MUTEX_HELD(&tod_lock));
77
78 ts = TODOP_GET(tod_ops);
79 ts.tv_sec = tod_validate(ts.tv_sec);
80 return (ts);
81 }
82
83 /*
84 * The following wrappers have been added so that locking
85 * can be exported to platform-independent clock routines
86 * (ie adjtime(), clock_setttime()), via a functional interface.
87 */
88 int
hr_clock_lock(void)89 hr_clock_lock(void)
90 {
91 ushort_t s;
92
93 CLOCK_LOCK(&s);
94 return (s);
95 }
96
97 void
hr_clock_unlock(int s)98 hr_clock_unlock(int s)
99 {
100 CLOCK_UNLOCK(s);
101 }
102
103 /*
104 * Support routines for horrid GMT lag handling
105 */
106
107 static time_t gmt_lag; /* offset in seconds of gmt to local time */
108
109 void
sgmtl(time_t arg)110 sgmtl(time_t arg)
111 {
112 gmt_lag = arg;
113 }
114
115 time_t
ggmtl(void)116 ggmtl(void)
117 {
118 return (gmt_lag);
119 }
120
121 /* rtcsync() - set 'time', assuming RTC and GMT lag are correct */
122
123 void
rtcsync(void)124 rtcsync(void)
125 {
126 timestruc_t ts;
127
128 mutex_enter(&tod_lock);
129 ts = TODOP_GET(tod_ops);
130 set_hrestime(&ts);
131 mutex_exit(&tod_lock);
132 }
133