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 unsigned int microdata = 50; /* loop count for 10 microsecond wait. */ 50 /* MUST be initialized for those who */ 51 /* insist on calling "tenmicrosec" before */ 52 /* the clock has been initialized. */ 53 54 char *tod_module_name; /* Settable in /etc/system */ 55 56 /* 57 * Write the specified time into the clock chip. 58 * Must be called with tod_lock held. 59 */ 60 void 61 tod_set(timestruc_t ts) 62 { 63 ASSERT(MUTEX_HELD(&tod_lock)); 64 65 /* 66 * Prevent false alarm in tod_validate() due to tod value change. 67 */ 68 tod_fault_reset(); 69 TODOP_SET(tod_ops, ts); 70 } 71 72 /* 73 * Read the current time from the clock chip and convert to UNIX form. 74 * Assumes that the year in the clock chip is valid. 75 * Must be called with tod_lock held. 76 */ 77 timestruc_t 78 tod_get(void) 79 { 80 timestruc_t ts; 81 82 ASSERT(MUTEX_HELD(&tod_lock)); 83 84 ts = TODOP_GET(tod_ops); 85 ts.tv_sec = tod_validate(ts.tv_sec); 86 return (ts); 87 } 88 89 /* 90 * The following wrappers have been added so that locking 91 * can be exported to platform-independent clock routines 92 * (ie adjtime(), clock_setttime()), via a functional interface. 93 */ 94 int 95 hr_clock_lock(void) 96 { 97 ushort_t s; 98 99 CLOCK_LOCK(&s); 100 return (s); 101 } 102 103 void 104 hr_clock_unlock(int s) 105 { 106 CLOCK_UNLOCK(s); 107 } 108 109 /* 110 * Support routines for horrid GMT lag handling 111 */ 112 113 static time_t gmt_lag; /* offset in seconds of gmt to local time */ 114 115 void 116 sgmtl(time_t arg) 117 { 118 gmt_lag = arg; 119 } 120 121 time_t 122 ggmtl(void) 123 { 124 return (gmt_lag); 125 } 126 127 /* rtcsync() - set 'time', assuming RTC and GMT lag are correct */ 128 129 void 130 rtcsync(void) 131 { 132 timestruc_t ts; 133 134 mutex_enter(&tod_lock); 135 ts = TODOP_GET(tod_ops); 136 set_hrestime(&ts); 137 mutex_exit(&tod_lock); 138 } 139