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 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 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 89 hr_clock_lock(void) 90 { 91 ushort_t s; 92 93 CLOCK_LOCK(&s); 94 return (s); 95 } 96 97 void 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 110 sgmtl(time_t arg) 111 { 112 gmt_lag = arg; 113 } 114 115 time_t 116 ggmtl(void) 117 { 118 return (gmt_lag); 119 } 120 121 /* rtcsync() - set 'time', assuming RTC and GMT lag are correct */ 122 123 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