kern_todr.c revision 1.11
1 /* $NetBSD: kern_todr.c,v 1.11 2006/09/07 07:26:07 dogcow 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 1.11 2006/09/07 07:26:07 dogcow Exp $"); 80 81 #include <sys/param.h> 82 #include <sys/kernel.h> 83 #include <sys/systm.h> 84 #include <sys/device.h> 85 #include <sys/timetc.h> 86 #include <dev/clock_subr.h> /* hmm.. this should probably move to sys */ 87 88 #ifdef __HAVE_GENERIC_TODR 89 90 static todr_chip_handle_t todr_handle = NULL; 91 92 /* 93 * Attach the clock device to todr_handle. 94 */ 95 void 96 todr_attach(todr_chip_handle_t todr) 97 { 98 99 if (todr_handle) { 100 printf("todr_attach: TOD already configured\n"); 101 return; 102 } 103 todr_handle = todr; 104 } 105 106 static int timeset = 0; 107 108 /* 109 * Set up the system's time, given a `reasonable' time value. 110 */ 111 void 112 inittodr(time_t base) 113 { 114 int badbase = 0, waszero = (base == 0), goodtime = 0, badrtc = 0; 115 #ifdef __HAVE_TIMECOUNTER 116 struct timespec ts; 117 #endif 118 struct timeval tv; 119 120 if (base < 5 * SECYR) { 121 struct clock_ymdhms basedate; 122 123 /* 124 * If base is 0, assume filesystem time is just unknown 125 * instead of preposterous. Don't bark. 126 */ 127 if (base != 0) 128 printf("WARNING: preposterous time in file system\n"); 129 /* not going to use it anyway, if the chip is readable */ 130 basedate.dt_year = 2006; 131 basedate.dt_mon = 1; 132 basedate.dt_day = 1; 133 basedate.dt_hour = 12; 134 basedate.dt_min = 0; 135 basedate.dt_sec = 0; 136 base = clock_ymdhms_to_secs(&basedate); 137 badbase = 1; 138 } 139 140 /* 141 * Some ports need to be supplied base in order to fabricate a time_t. 142 */ 143 tv.tv_sec = base; 144 tv.tv_usec = 0; 145 146 if ((todr_handle == NULL) || 147 (todr_gettime(todr_handle, &tv) != 0) || 148 (tv.tv_sec < (5 * SECYR))) { 149 150 if (todr_handle != NULL) 151 printf("WARNING: preposterous TOD clock time\n"); 152 else 153 printf("WARNING: no TOD clock present\n"); 154 badrtc = 1; 155 } else { 156 int deltat = tv.tv_sec - base; 157 158 if (deltat < 0) 159 deltat = -deltat; 160 161 if ((badbase == 0) && deltat >= 2 * SECDAY) { 162 163 if (tv.tv_sec < base) { 164 /* 165 * The clock should never go backwards 166 * relative to filesystem time. If it 167 * does by more than the threshold, 168 * believe the filesystem. 169 */ 170 printf("WARNING: clock lost %d days\n", 171 deltat / SECDAY); 172 badrtc = 1; 173 } 174 else { 175 printf("WARNING: clock gained %d days\n", 176 deltat / SECDAY); 177 } 178 } else { 179 goodtime = 1; 180 } 181 } 182 183 /* if the rtc time is bad, use the filesystem time */ 184 if (badrtc) { 185 if (badbase) { 186 printf("WARNING: using default initial time\n"); 187 } else { 188 printf("WARNING: using filesystem time\n"); 189 } 190 tv.tv_sec = base; 191 tv.tv_usec = 0; 192 } 193 194 timeset = 1; 195 196 #ifdef __HAVE_TIMECOUNTER 197 ts.tv_sec = tv.tv_sec; 198 ts.tv_nsec = tv.tv_usec * 1000; 199 tc_setclock(&ts); 200 #else 201 time = tv; 202 #endif 203 204 if (waszero || goodtime) 205 return; 206 207 printf("WARNING: CHECK AND RESET THE DATE!\n"); 208 } 209 210 /* 211 * Reset the TODR based on the time value; used when the TODR 212 * has a preposterous value and also when the time is reset 213 * by the stime system call. Also called when the TODR goes past 214 * TODRZERO + 100*(SECYEAR+2*SECDAY) (e.g. on Jan 2 just after midnight) 215 * to wrap the TODR around. 216 */ 217 void 218 resettodr(void) 219 { 220 #ifdef __HAVE_TIMECOUNTER 221 struct timeval time; 222 #endif 223 224 /* 225 * We might have been called by boot() due to a crash early 226 * on. Don't reset the clock chip if we don't know what time 227 * it is. 228 */ 229 if (!timeset) 230 return; 231 232 #ifdef __HAVE_TIMECOUNTER 233 getmicrotime(&time); 234 #endif 235 236 if (time.tv_sec == 0) 237 return; 238 239 if (todr_handle) 240 if (todr_settime(todr_handle, &time) != 0) 241 printf("Cannot set TOD clock time\n"); 242 } 243 244 #endif /* __HAVE_GENERIC_TODR */ 245 246 247 int 248 todr_gettime(todr_chip_handle_t tch, struct timeval *tvp) 249 { 250 struct clock_ymdhms dt; 251 int rv; 252 253 if (tch->todr_gettime) 254 return tch->todr_gettime(tch, tvp); 255 256 if (tch->todr_gettime_ymdhms) { 257 if ((rv = tch->todr_gettime_ymdhms(tch, &dt)) != 0) 258 return rv; 259 260 /* 261 * Formerly we had code here that explicitly checked 262 * for 2038 year rollover. 263 * 264 * However, clock_ymdhms_to_secs performs the same 265 * check for us, so we need not worry about it. Note 266 * that this assumes that the tvp->tv_sec member is is 267 * a time_t. 268 */ 269 270 /* simple sanity checks */ 271 if (dt.dt_mon > 12 || dt.dt_day > 31 || 272 dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) 273 return -1; 274 275 tvp->tv_sec = clock_ymdhms_to_secs(&dt) + rtc_offset * 60; 276 tvp->tv_usec = 0; 277 return tvp->tv_sec < 0 ? -1 : 0; 278 } 279 280 return -1; 281 } 282 283 int 284 todr_settime(todr_chip_handle_t tch, volatile struct timeval *tvp) 285 { 286 struct clock_ymdhms dt; 287 288 if (tch->todr_settime) 289 return tch->todr_settime(tch, tvp); 290 291 if (tch->todr_settime_ymdhms) { 292 time_t sec = tvp->tv_sec - rtc_offset * 60; 293 if (tvp->tv_usec >= 500000) 294 sec++; 295 clock_secs_to_ymdhms(sec, &dt); 296 return tch->todr_settime_ymdhms(tch, &dt); 297 } 298 299 return -1; 300 } 301
Indexes created Mon Sep 22 21:09:42 GMT 2025