kern_todr.c revision 1.3
1 /* $NetBSD: kern_todr.c,v 1.3 2006/09/03 06:37:55 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 1.3 2006/09/03 06:37:55 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 static int timeset = 0; 108 109 /* 110 * Set up the system's time, given a `reasonable' time value. 111 */ 112 void 113 inittodr(time_t base) 114 { 115 int badbase = 0, waszero = base == 0, goodtime = 0, badrtc = 0; 116 #ifdef __HAVE_TIMECOUNTER 117 struct timespec ts; 118 #endif 119 struct timeval tv; 120 121 if (base < 5 * SECYR) { 122 /* 123 * If base is 0, assume filesystem time is just unknown 124 * instead of preposterous. Don't bark. 125 */ 126 if (base != 0) 127 printf("WARNING: preposterous time in file system\n"); 128 /* not going to use it anyway, if the chip is readable */ 129 base = 21*SECYR + 186*SECDAY + SECDAY/2; 130 badbase = 1; 131 } 132 133 if ((todr_handle == NULL) || 134 (todr_gettime(todr_handle, &tv) != 0) || 135 (tv.tv_sec < (5 * SECYR))) { 136 137 if (todr_handle != NULL) 138 printf("WARNING: preposterous TOD clock time\n"); 139 else 140 printf("WARNING: no TOD clock present\n"); 141 badrtc = 1; 142 } else { 143 int deltat = tv.tv_sec - base; 144 145 if (deltat < 0) 146 deltat = -deltat; 147 148 if ((badbase == 0) && deltat >= 2 * SECDAY) { 149 150 if (tv.tv_sec < base) { 151 /* 152 * The clock should never go backwards 153 * relative to filesystem time. If it 154 * does by more than the threshold, 155 * believe the filesystem. 156 */ 157 printf("WARNING: clock lost %d days\n", 158 deltat / SECDAY); 159 badrtc = 1; 160 } 161 else { 162 printf("WARNING: clock gained %d days\n", 163 deltat / SECDAY); 164 } 165 } else { 166 goodtime = 1; 167 } 168 } 169 170 /* if the rtc time is bad, use the filesystem time */ 171 if (badrtc) { 172 if (badbase) { 173 printf("WARNING: using default initial time\n"); 174 } else { 175 printf("WARNING: using filesystem time\n"); 176 } 177 tv.tv_sec = base; 178 tv.tv_usec = 0; 179 } 180 181 timeset = 1; 182 183 #ifdef __HAVE_TIMECOUNTER 184 ts.tv_sec = tv.tv_sec; 185 ts.tv_nsec = tv.tv_usec * 1000; 186 tc_setclock(&ts); 187 #else 188 time = tv; 189 #endif 190 191 if (waszero || goodtime) 192 return; 193 194 195 printf("WARNING: CHECK AND RESET THE DATE!\n"); 196 197 } 198 199 /* 200 * Reset the TODR based on the time value; used when the TODR 201 * has a preposterous value and also when the time is reset 202 * by the stime system call. Also called when the TODR goes past 203 * TODRZERO + 100*(SECYEAR+2*SECDAY) (e.g. on Jan 2 just after midnight) 204 * to wrap the TODR around. 205 */ 206 void 207 resettodr(void) 208 { 209 #ifdef __HAVE_TIMECOUNTER 210 struct timeval time; 211 #endif 212 213 /* 214 * We might have been called by boot() due to a crash early 215 * on. Don't reset the clock chip if we don't know what time 216 * it is. 217 */ 218 if (!timeset) 219 return; 220 221 #ifdef __HAVE_TIMECOUNTER 222 getmicrotime(&time); 223 #endif 224 225 if (time.tv_sec == 0) 226 return; 227 228 if (todr_handle) 229 if (todr_settime(todr_handle, &time) != 0) 230 printf("Cannot set TOD clock time\n"); 231 } 232 233 #endif /* __HAVE_GENERIC_TODR */ 234
Indexes created Sun Sep 21 18:09:52 GMT 2025