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 2007 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 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/systm.h> 36 #include <sys/archsystm.h> 37 #include <sys/lockstat.h> 38 39 #include <sys/clock.h> 40 #include <sys/debug.h> 41 #include <sys/smp_impldefs.h> 42 #include <sys/rtc.h> 43 44 /* 45 * This file contains all generic part of clock and timer handling. 46 * Specifics are now in separate files and may be overridden by TOD 47 * modules. 48 */ 49 50 char *tod_module_name; /* Settable in /etc/system */ 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 /* 62 * Prevent false alarm in tod_validate() due to tod value change. 63 */ 64 tod_fault_reset(); 65 TODOP_SET(tod_ops, ts); 66 } 67 68 /* 69 * Read the current time from the clock chip and convert to UNIX form. 70 * Assumes that the year in the clock chip is valid. 71 * Must be called with tod_lock held. 72 */ 73 timestruc_t 74 tod_get(void) 75 { 76 timestruc_t ts; 77 78 ASSERT(MUTEX_HELD(&tod_lock)); 79 80 ts = TODOP_GET(tod_ops); 81 ts.tv_sec = tod_validate(ts.tv_sec); 82 return (ts); 83 } 84 85 /* 86 * The following wrappers have been added so that locking 87 * can be exported to platform-independent clock routines 88 * (ie adjtime(), clock_setttime()), via a functional interface. 89 */ 90 int 91 hr_clock_lock(void) 92 { 93 ushort_t s; 94 95 CLOCK_LOCK(&s); 96 return (s); 97 } 98 99 void 100 hr_clock_unlock(int s) 101 { 102 CLOCK_UNLOCK(s); 103 } 104 105 /* 106 * Support routines for horrid GMT lag handling 107 */ 108 109 static time_t gmt_lag; /* offset in seconds of gmt to local time */ 110 111 void 112 sgmtl(time_t arg) 113 { 114 gmt_lag = arg; 115 } 116 117 time_t 118 ggmtl(void) 119 { 120 return (gmt_lag); 121 } 122 123 /* rtcsync() - set 'time', assuming RTC and GMT lag are correct */ 124 125 void 126 rtcsync(void) 127 { 128 timestruc_t ts; 129 130 mutex_enter(&tod_lock); 131 ts = TODOP_GET(tod_ops); 132 set_hrestime(&ts); 133 mutex_exit(&tod_lock); 134 } 135