kern_todr.c revision 1.1
1 /* $NetBSD: kern_todr.c,v 1.1 2006/09/02 20:18:00 gdamore Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department and Ralph Campbell. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Utah Hdr: clock.c 1.18 91/01/21 36 * 37 * @(#)clock.c 8.1 (Berkeley) 6/10/93 38 */ 39 /* 40 * Copyright (c) 1988 University of Utah. 41 * 42 * This code is derived from software contributed to Berkeley by 43 * the Systems Programming Group of the University of Utah Computer 44 * Science Department and Ralph Campbell. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the University of 57 * California, Berkeley and its contributors. 58 * 4. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * from: Utah Hdr: clock.c 1.18 91/01/21 75 * 76 * @(#)clock.c 8.1 (Berkeley) 6/10/93 77 */ 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: kern_todr.c,v 1.1 2006/09/02 20:18:00 gdamore Exp $"); 80 81 #include <sys/param.h> 82 83 #ifdef __HAVE_GENERIC_TODR 84 85 #include <sys/kernel.h> 86 #include <sys/systm.h> 87 #include <sys/device.h> 88 #include <sys/timetc.h> 89 #include <dev/clock_subr.h> /* hmm.. this should probably move to sys */ 90 91 static todr_chip_handle_t todr_handle = NULL; 92 93 /* 94 * Attach the clock device to todr_handle. 95 */ 96 void 97 todr_attach(todr_chip_handle_t todr) 98 { 99 100 if (todr_handle) { 101 printf("todr_attach: TOD already configured\n"); 102 return; 103 } 104 todr_handle = todr; 105 } 106 107 /* 108 * Set up the system's time, given a `reasonable' time value. 109 */ 110 void 111 inittodr(time_t base) 112 { 113 int badbase = 0, waszero = base == 0; 114 #ifdef __HAVE_TIMECOUNTER 115 struct timeval time; 116 struct timespec ts; 117 #endif 118 119 if (base < 5 * SECYR) { 120 /* 121 * If base is 0, assume filesystem time is just unknown 122 * in stead of preposterous. Don't bark. 123 */ 124 if (base != 0) 125 printf("WARNING: preposterous time in file system\n"); 126 /* not going to use it anyway, if the chip is readable */ 127 base = 21*SECYR + 186*SECDAY + SECDAY/2; 128 badbase = 1; 129 } 130 131 if ((todr_handle == NULL) || 132 (todr_gettime(todr_handle, &time) != 0) || 133 (time.tv_sec == 0)) { 134 135 if (todr_handle != NULL) 136 printf("WARNING: preposterous TOD clock time"); 137 else 138 printf("WARNING: no TOD clock present"); 139 140 /* 141 * Believe the time in the file system for lack of 142 * anything better, resetting the clock. 143 */ 144 time.tv_sec = base; 145 #ifdef __HAVE_TIMECOUNTER 146 ts.tv_sec = base; 147 ts.tv_nsec = 0; 148 tc_setclock(&ts); 149 #endif 150 if (!badbase) 151 resettodr(); 152 } else { 153 int deltat = time.tv_sec - base; 154 155 #ifdef __HAVE_TIMECOUNTER 156 ts.tv_sec = time.tv_sec; 157 ts.tv_nsec = time.tv_usec * 1000; 158 tc_setclock(&ts); 159 #endif 160 161 if (deltat < 0) 162 deltat = -deltat; 163 if (waszero || deltat < 2 * SECDAY) 164 return; 165 printf("WARNING: clock %s %d days", 166 time.tv_sec < base ? "lost" : "gained", deltat / SECDAY); 167 } 168 printf(" -- CHECK AND RESET THE DATE!\n"); 169 } 170 171 /* 172 * Reset the TODR based on the time value; used when the TODR 173 * has a preposterous value and also when the time is reset 174 * by the stime system call. Also called when the TODR goes past 175 * TODRZERO + 100*(SECYEAR+2*SECDAY) (e.g. on Jan 2 just after midnight) 176 * to wrap the TODR around. 177 */ 178 void 179 resettodr(void) 180 { 181 #ifdef __HAVE_TIMECOUNTER 182 struct timeval time; 183 184 getmicrotime(&time); 185 #endif 186 187 if (time.tv_sec == 0) 188 return; 189 190 if (todr_handle) 191 if (todr_settime(todr_handle, &time) != 0) 192 printf("Cannot set TOD clock time\n"); 193 } 194 195 #endif /* __HAVE_GENERIC_TODR */ 196
Indexes created Tue Sep 23 07:09:52 GMT 2025