clock.c revision 1.18
1 /* $NetBSD: clock.c,v 1.18 2008/01/03 21:30:16 he Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz and Don Ahn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)clock.c 7.2 (Berkeley) 5/12/91 35 */ 36 /*- 37 * Copyright (c) 1993, 1994 Charles M. Hannum. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * William Jolitz and Don Ahn. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)clock.c 7.2 (Berkeley) 5/12/91 71 */ 72 /* 73 * Mach Operating System 74 * Copyright (c) 1991,1990,1989 Carnegie Mellon University 75 * All Rights Reserved. 76 * 77 * Permission to use, copy, modify and distribute this software and its 78 * documentation is hereby granted, provided that both the copyright 79 * notice and this permission notice appear in all copies of the 80 * software, derivative works or modified versions, and any portions 81 * thereof, and that both notices appear in supporting documentation. 82 * 83 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 84 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 85 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 86 * 87 * Carnegie Mellon requests users of this software to return to 88 * 89 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 90 * School of Computer Science 91 * Carnegie Mellon University 92 * Pittsburgh PA 15213-3890 93 * 94 * any improvements or extensions that they make and grant Carnegie Mellon 95 * the rights to redistribute these changes. 96 */ 97 /* 98 Copyright 1988, 1989 by Intel Corporation, Santa Clara, California. 99 100 All Rights Reserved 101 102 Permission to use, copy, modify, and distribute this software and 103 its documentation for any purpose and without fee is hereby 104 granted, provided that the above copyright notice appears in all 105 copies and that both the copyright notice and this permission notice 106 appear in supporting documentation, and that the name of Intel 107 not be used in advertising or publicity pertaining to distribution 108 of the software without specific, written prior permission. 109 110 INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 111 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, 112 IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 113 CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 114 LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 115 NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 116 WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 117 */ 118 119 /* 120 * Primitive clock interrupt routines. 121 */ 122 123 #include <sys/cdefs.h> 124 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.18 2008/01/03 21:30:16 he Exp $"); 125 126 /* #define CLOCKDEBUG */ 127 /* #define CLOCK_PARANOIA */ 128 129 #include "opt_multiprocessor.h" 130 #include "opt_ntp.h" 131 132 #include <sys/param.h> 133 #include <sys/systm.h> 134 #include <sys/time.h> 135 #include <sys/timetc.h> 136 #include <sys/kernel.h> 137 #include <sys/device.h> 138 #include <sys/mutex.h> 139 140 #include <machine/cpu.h> 141 #include <machine/intr.h> 142 #include <machine/pio.h> 143 #include <machine/cpufunc.h> 144 145 #include <dev/isa/isareg.h> 146 #include <dev/isa/isavar.h> 147 #include <dev/ic/mc146818reg.h> 148 #include <dev/ic/i8253reg.h> 149 #include <i386/isa/nvram.h> 150 #include <x86/x86/tsc.h> 151 #include <dev/clock_subr.h> 152 #include <machine/specialreg.h> 153 154 #include "config_time.h" /* for CONFIG_TIME */ 155 156 #ifndef __x86_64__ 157 #include "mca.h" 158 #endif 159 #if NMCA > 0 160 #include <machine/mca_machdep.h> /* for MCA_system */ 161 #endif 162 163 #include "pcppi.h" 164 #if (NPCPPI > 0) 165 #include <dev/isa/pcppivar.h> 166 167 int sysbeepmatch(struct device *, struct cfdata *, void *); 168 void sysbeepattach(struct device *, struct device *, void *); 169 int sysbeepdetach(device_t, int); 170 171 CFATTACH_DECL(sysbeep, sizeof(struct device), 172 sysbeepmatch, sysbeepattach, sysbeepdetach, NULL); 173 174 static int ppi_attached; 175 static pcppi_tag_t ppicookie; 176 #endif /* PCPPI */ 177 178 #ifdef CLOCKDEBUG 179 int clock_debug = 0; 180 #define DPRINTF(arg) if (clock_debug) printf arg 181 #else 182 #define DPRINTF(arg) 183 #endif 184 185 /* Used by lapic.c */ 186 unsigned int gettick(void); 187 void sysbeep(int, int); 188 static void tickle_tc(void); 189 190 static int clockintr(void *, struct intrframe *); 191 static void rtcinit(void); 192 static int rtcget(mc_todregs *); 193 static void rtcput(mc_todregs *); 194 195 static int cmoscheck(void); 196 197 static int clock_expandyear(int); 198 int sysbeepdetach(device_t, int); 199 200 static unsigned int gettick_broken_latch(void); 201 202 static volatile uint32_t i8254_lastcount; 203 static volatile uint32_t i8254_offset; 204 static volatile int i8254_ticked; 205 206 /* to protect TC timer variables */ 207 static __cpu_simple_lock_t tmr_lock = __SIMPLELOCK_UNLOCKED; 208 209 inline u_int mc146818_read(void *, u_int); 210 inline void mc146818_write(void *, u_int, u_int); 211 212 u_int i8254_get_timecount(struct timecounter *); 213 static void rtc_register(void); 214 215 static struct timecounter i8254_timecounter = { 216 i8254_get_timecount, /* get_timecount */ 217 0, /* no poll_pps */ 218 ~0u, /* counter_mask */ 219 TIMER_FREQ, /* frequency */ 220 "i8254", /* name */ 221 100, /* quality */ 222 NULL, /* prev */ 223 NULL, /* next */ 224 }; 225 226 /* XXX use sc? */ 227 inline u_int 228 mc146818_read(void *sc, u_int reg) 229 { 230 231 outb(IO_RTC, reg); 232 return (inb(IO_RTC+1)); 233 } 234 235 /* XXX use sc? */ 236 inline void 237 mc146818_write(void *sc, u_int reg, u_int datum) 238 { 239 240 outb(IO_RTC, reg); 241 outb(IO_RTC+1, datum); 242 } 243 244 u_long rtclock_tval; /* i8254 reload value for countdown */ 245 int rtclock_init = 0; 246 247 int clock_broken_latch = 0; 248 249 #ifdef CLOCK_PARANOIA 250 static int ticks[6]; 251 #endif 252 /* 253 * i8254 latch check routine: 254 * National Geode (formerly Cyrix MediaGX) has a serious bug in 255 * its built-in i8254-compatible clock module. 256 * machdep sets the variable 'clock_broken_latch' to indicate it. 257 */ 258 259 static unsigned int 260 gettick_broken_latch(void) 261 { 262 int v1, v2, v3; 263 int w1, w2, w3; 264 int s; 265 266 /* Don't want someone screwing with the counter while we're here. */ 267 s = splhigh(); 268 __cpu_simple_lock(&tmr_lock); 269 v1 = inb(IO_TIMER1+TIMER_CNTR0); 270 v1 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 271 v2 = inb(IO_TIMER1+TIMER_CNTR0); 272 v2 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 273 v3 = inb(IO_TIMER1+TIMER_CNTR0); 274 v3 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 275 __cpu_simple_unlock(&tmr_lock); 276 splx(s); 277 278 #ifdef CLOCK_PARANOIA 279 if (clock_debug) { 280 ticks[0] = ticks[3]; 281 ticks[1] = ticks[4]; 282 ticks[2] = ticks[5]; 283 ticks[3] = v1; 284 ticks[4] = v2; 285 ticks[5] = v3; 286 } 287 #endif 288 289 if (v1 >= v2 && v2 >= v3 && v1 - v3 < 0x200) 290 return (v2); 291 292 #define _swap_val(a, b) do { \ 293 int c = a; \ 294 a = b; \ 295 b = c; \ 296 } while (0) 297 298 /* 299 * sort v1 v2 v3 300 */ 301 if (v1 < v2) 302 _swap_val(v1, v2); 303 if (v2 < v3) 304 _swap_val(v2, v3); 305 if (v1 < v2) 306 _swap_val(v1, v2); 307 308 /* 309 * compute the middle value 310 */ 311 312 if (v1 - v3 < 0x200) 313 return (v2); 314 315 w1 = v2 - v3; 316 w2 = v3 - v1 + rtclock_tval; 317 w3 = v1 - v2; 318 if (w1 >= w2) { 319 if (w1 >= w3) 320 return (v1); 321 } else { 322 if (w2 >= w3) 323 return (v2); 324 } 325 return (v3); 326 } 327 328 /* minimal initialization, enough for delay() */ 329 void 330 initrtclock(u_long freq) 331 { 332 u_long tval; 333 334 /* 335 * Compute timer_count, the count-down count the timer will be 336 * set to. Also, correctly round 337 * this by carrying an extra bit through the division. 338 */ 339 tval = (freq * 2) / (u_long) hz; 340 tval = (tval / 2) + (tval & 0x1); 341 342 /* initialize 8254 clock */ 343 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT); 344 345 /* Correct rounding will buy us a better precision in timekeeping */ 346 outb(IO_TIMER1+TIMER_CNTR0, tval % 256); 347 outb(IO_TIMER1+TIMER_CNTR0, tval / 256); 348 349 rtclock_tval = tval ? tval : 0xFFFF; 350 rtclock_init = 1; 351 } 352 353 void 354 startrtclock(void) 355 { 356 int s; 357 358 if (!rtclock_init) 359 initrtclock(TIMER_FREQ); 360 361 /* Check diagnostic status */ 362 if ((s = mc146818_read(NULL, NVRAM_DIAG)) != 0) { /* XXX softc */ 363 char bits[128]; 364 printf("RTC BIOS diagnostic error %s\n", 365 bitmask_snprintf(s, NVRAM_DIAG_BITS, bits, sizeof(bits))); 366 } 367 368 tc_init(&i8254_timecounter); 369 370 init_TSC(); 371 rtc_register(); 372 } 373 374 /* 375 * Must be called at splsched(). 376 */ 377 static void 378 tickle_tc(void) 379 { 380 #if defined(MULTIPROCESSOR) 381 struct cpu_info *ci = curcpu(); 382 /* 383 * If we are not the primary CPU, we're not allowed to do 384 * any more work. 385 */ 386 if (CPU_IS_PRIMARY(ci) == 0) 387 return; 388 #endif 389 if (rtclock_tval && timecounter->tc_get_timecount == i8254_get_timecount) { 390 __cpu_simple_lock(&tmr_lock); 391 if (i8254_ticked) 392 i8254_ticked = 0; 393 else { 394 i8254_offset += rtclock_tval; 395 i8254_lastcount = 0; 396 } 397 __cpu_simple_unlock(&tmr_lock); 398 } 399 400 } 401 402 static int 403 clockintr(void *arg, struct intrframe *frame) 404 { 405 tickle_tc(); 406 407 hardclock((struct clockframe *)frame); 408 409 #if NMCA > 0 410 if (MCA_system) { 411 /* Reset PS/2 clock interrupt by asserting bit 7 of port 0x61 */ 412 outb(0x61, inb(0x61) | 0x80); 413 } 414 #endif 415 return -1; 416 } 417 418 u_int 419 i8254_get_timecount(struct timecounter *tc) 420 { 421 u_int count; 422 uint16_t rdval; 423 int s; 424 425 /* Don't want someone screwing with the counter while we're here. */ 426 s = splhigh(); 427 __cpu_simple_lock(&tmr_lock); 428 /* Select timer0 and latch counter value. */ 429 outb(IO_TIMER1 + TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 430 /* insb to make the read atomic */ 431 insb(IO_TIMER1+TIMER_CNTR0, &rdval, 2); 432 count = rtclock_tval - rdval; 433 if (rtclock_tval && (count < i8254_lastcount || !i8254_ticked)) { 434 i8254_ticked = 1; 435 i8254_offset += rtclock_tval; 436 } 437 i8254_lastcount = count; 438 count += i8254_offset; 439 __cpu_simple_unlock(&tmr_lock); 440 splx(s); 441 442 return (count); 443 } 444 445 unsigned int 446 gettick(void) 447 { 448 uint16_t rdval; 449 int s; 450 451 if (clock_broken_latch) 452 return (gettick_broken_latch()); 453 454 /* Don't want someone screwing with the counter while we're here. */ 455 s = splhigh(); 456 __cpu_simple_lock(&tmr_lock); 457 /* Select counter 0 and latch it. */ 458 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 459 /* insb to make the read atomic */ 460 insb(IO_TIMER1+TIMER_CNTR0, &rdval, 2); 461 __cpu_simple_unlock(&tmr_lock); 462 splx(s); 463 464 return rdval; 465 } 466 467 /* 468 * Wait approximately `n' microseconds. 469 * Relies on timer 1 counting down from (TIMER_FREQ / hz) at TIMER_FREQ Hz. 470 * Note: timer had better have been programmed before this is first used! 471 * (Note that we use `rate generator' mode, which counts at 1:1; `square 472 * wave' mode counts at 2:1). 473 * Don't rely on this being particularly accurate. 474 */ 475 void 476 i8254_delay(unsigned int n) 477 { 478 unsigned int cur_tick, initial_tick; 479 int remaining; 480 481 /* allow DELAY() to be used before startrtclock() */ 482 if (!rtclock_init) 483 initrtclock(TIMER_FREQ); 484 485 /* 486 * Read the counter first, so that the rest of the setup overhead is 487 * counted. 488 */ 489 initial_tick = gettick(); 490 491 if (n <= UINT_MAX / TIMER_FREQ) { 492 /* 493 * For unsigned arithmetic, division can be replaced with 494 * multiplication with the inverse and a shift. 495 */ 496 remaining = n * TIMER_FREQ / 1000000; 497 } else { 498 /* This is a very long delay. 499 * Being slow here doesn't matter. 500 */ 501 remaining = (unsigned long long) n * TIMER_FREQ / 1000000; 502 } 503 504 while (remaining > 0) { 505 #ifdef CLOCK_PARANOIA 506 int delta; 507 cur_tick = gettick(); 508 if (cur_tick > initial_tick) 509 delta = rtclock_tval - (cur_tick - initial_tick); 510 else 511 delta = initial_tick - cur_tick; 512 if (delta < 0 || delta >= rtclock_tval / 2) { 513 DPRINTF(("delay: ignore ticks %.4x-%.4x", 514 initial_tick, cur_tick)); 515 if (clock_broken_latch) { 516 DPRINTF((" (%.4x %.4x %.4x %.4x %.4x %.4x)\n", 517 ticks[0], ticks[1], ticks[2], 518 ticks[3], ticks[4], ticks[5])); 519 } else { 520 DPRINTF(("\n")); 521 } 522 } else 523 remaining -= delta; 524 #else 525 cur_tick = gettick(); 526 if (cur_tick > initial_tick) 527 remaining -= rtclock_tval - (cur_tick - initial_tick); 528 else 529 remaining -= initial_tick - cur_tick; 530 #endif 531 initial_tick = cur_tick; 532 } 533 } 534 535 #if (NPCPPI > 0) 536 int 537 sysbeepmatch(struct device *parent, struct cfdata *match, 538 void *aux) 539 { 540 return (!ppi_attached); 541 } 542 543 void 544 sysbeepattach(struct device *parent, struct device *self, 545 void *aux) 546 { 547 aprint_naive("\n"); 548 aprint_normal("\n"); 549 550 ppicookie = ((struct pcppi_attach_args *)aux)->pa_cookie; 551 ppi_attached = 1; 552 553 if (!pmf_device_register(self, NULL, NULL)) 554 aprint_error_dev(self, "couldn't establish power handler\n"); 555 } 556 #endif 557 558 int 559 sysbeepdetach(device_t self, int flags) 560 { 561 pmf_device_deregister(self); 562 #if (NPCPPI > 0) 563 ppi_attached = 0; 564 #endif 565 return 0; 566 } 567 568 void 569 sysbeep(int pitch, int period) 570 { 571 #if (NPCPPI > 0) 572 if (ppi_attached) 573 pcppi_bell(ppicookie, pitch, period, 0); 574 #endif 575 } 576 577 void 578 i8254_initclocks(void) 579 { 580 581 /* 582 * XXX If you're doing strange things with multiple clocks, you might 583 * want to keep track of clock handlers. 584 */ 585 (void)isa_intr_establish(NULL, 0, IST_PULSE, IPL_CLOCK, 586 (int (*)(void *))clockintr, 0); 587 } 588 589 static void 590 rtcinit(void) 591 { 592 static int first_rtcopen_ever = 1; 593 594 if (!first_rtcopen_ever) 595 return; 596 first_rtcopen_ever = 0; 597 598 mc146818_write(NULL, MC_REGA, /* XXX softc */ 599 MC_BASE_32_KHz | MC_RATE_1024_Hz); 600 mc146818_write(NULL, MC_REGB, MC_REGB_24HR); /* XXX softc */ 601 } 602 603 static int 604 rtcget(mc_todregs *regs) 605 { 606 607 rtcinit(); 608 if ((mc146818_read(NULL, MC_REGD) & MC_REGD_VRT) == 0) /* XXX softc */ 609 return (-1); 610 MC146818_GETTOD(NULL, regs); /* XXX softc */ 611 return (0); 612 } 613 614 static void 615 rtcput(mc_todregs *regs) 616 { 617 618 rtcinit(); 619 MC146818_PUTTOD(NULL, regs); /* XXX softc */ 620 } 621 622 /* 623 * check whether the CMOS layout is "standard"-like (ie, not PS/2-like), 624 * to be called at splclock() 625 */ 626 static int 627 cmoscheck(void) 628 { 629 int i; 630 unsigned short cksum = 0; 631 632 for (i = 0x10; i <= 0x2d; i++) 633 cksum += mc146818_read(NULL, i); /* XXX softc */ 634 635 return (cksum == (mc146818_read(NULL, 0x2e) << 8) 636 + mc146818_read(NULL, 0x2f)); 637 } 638 639 #if NMCA > 0 640 /* 641 * Check whether the CMOS layout is PS/2 like, to be called at splclock(). 642 */ 643 static int cmoscheckps2(void); 644 static int 645 cmoscheckps2(void) 646 { 647 #if 0 648 /* Disabled until I find out the CRC checksum algorithm IBM uses */ 649 int i; 650 unsigned short cksum = 0; 651 652 for (i = 0x10; i <= 0x31; i++) 653 cksum += mc146818_read(NULL, i); /* XXX softc */ 654 655 return (cksum == (mc146818_read(NULL, 0x32) << 8) 656 + mc146818_read(NULL, 0x33)); 657 #else 658 /* Check 'incorrect checksum' bit of IBM PS/2 Diagnostic Status Byte */ 659 return ((mc146818_read(NULL, NVRAM_DIAG) & (1<<6)) == 0); 660 #endif 661 } 662 #endif /* NMCA > 0 */ 663 664 /* 665 * patchable to control century byte handling: 666 * 1: always update 667 * -1: never touch 668 * 0: try to figure out itself 669 */ 670 int rtc_update_century = 0; 671 672 /* 673 * Expand a two-digit year as read from the clock chip 674 * into full width. 675 * Being here, deal with the CMOS century byte. 676 */ 677 static int centb = NVRAM_CENTURY; 678 static int 679 clock_expandyear(int clockyear) 680 { 681 int s, clockcentury, cmoscentury; 682 683 clockcentury = (clockyear < 70) ? 20 : 19; 684 clockyear += 100 * clockcentury; 685 686 if (rtc_update_century < 0) 687 return (clockyear); 688 689 s = splclock(); 690 if (cmoscheck()) 691 cmoscentury = mc146818_read(NULL, NVRAM_CENTURY); 692 #if NMCA > 0 693 else if (MCA_system && cmoscheckps2()) 694 cmoscentury = mc146818_read(NULL, (centb = 0x37)); 695 #endif 696 else 697 cmoscentury = 0; 698 splx(s); 699 if (!cmoscentury) { 700 #ifdef DIAGNOSTIC 701 printf("clock: unknown CMOS layout\n"); 702 #endif 703 return (clockyear); 704 } 705 cmoscentury = bcdtobin(cmoscentury); 706 707 if (cmoscentury != clockcentury) { 708 /* XXX note: saying "century is 20" might confuse the naive. */ 709 printf("WARNING: NVRAM century is %d but RTC year is %d\n", 710 cmoscentury, clockyear); 711 712 /* Kludge to roll over century. */ 713 if ((rtc_update_century > 0) || 714 ((cmoscentury == 19) && (clockcentury == 20) && 715 (clockyear == 2000))) { 716 printf("WARNING: Setting NVRAM century to %d\n", 717 clockcentury); 718 s = splclock(); 719 mc146818_write(NULL, centb, bintobcd(clockcentury)); 720 splx(s); 721 } 722 } else if (cmoscentury == 19 && rtc_update_century == 0) 723 rtc_update_century = 1; /* will update later in resettodr() */ 724 725 return (clockyear); 726 } 727 728 static int 729 rtc_get_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 730 { 731 int s; 732 mc_todregs rtclk; 733 734 s = splclock(); 735 if (rtcget(&rtclk)) { 736 splx(s); 737 return -1; 738 } 739 splx(s); 740 741 dt->dt_sec = bcdtobin(rtclk[MC_SEC]); 742 dt->dt_min = bcdtobin(rtclk[MC_MIN]); 743 dt->dt_hour = bcdtobin(rtclk[MC_HOUR]); 744 dt->dt_day = bcdtobin(rtclk[MC_DOM]); 745 dt->dt_mon = bcdtobin(rtclk[MC_MONTH]); 746 dt->dt_year = clock_expandyear(bcdtobin(rtclk[MC_YEAR])); 747 748 return 0; 749 } 750 751 static int 752 rtc_set_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 753 { 754 mc_todregs rtclk; 755 int century; 756 int s; 757 758 s = splclock(); 759 if (rtcget(&rtclk)) 760 memset(&rtclk, 0, sizeof(rtclk)); 761 splx(s); 762 763 rtclk[MC_SEC] = bintobcd(dt->dt_sec); 764 rtclk[MC_MIN] = bintobcd(dt->dt_min); 765 rtclk[MC_HOUR] = bintobcd(dt->dt_hour); 766 rtclk[MC_DOW] = dt->dt_wday + 1; 767 rtclk[MC_YEAR] = bintobcd(dt->dt_year % 100); 768 rtclk[MC_MONTH] = bintobcd(dt->dt_mon); 769 rtclk[MC_DOM] = bintobcd(dt->dt_day); 770 771 #ifdef DEBUG_CLOCK 772 printf("setclock: %x/%x/%x %x:%x:%x\n", rtclk[MC_YEAR], rtclk[MC_MONTH], 773 rtclk[MC_DOM], rtclk[MC_HOUR], rtclk[MC_MIN], rtclk[MC_SEC]); 774 #endif 775 s = splclock(); 776 rtcput(&rtclk); 777 if (rtc_update_century > 0) { 778 century = bintobcd(dt->dt_year / 100); 779 mc146818_write(NULL, centb, century); /* XXX softc */ 780 } 781 splx(s); 782 return 0; 783 784 } 785 786 static void 787 rtc_register(void) 788 { 789 static struct todr_chip_handle tch; 790 tch.todr_gettime_ymdhms = rtc_get_ymdhms; 791 tch.todr_settime_ymdhms = rtc_set_ymdhms; 792 tch.todr_setwen = NULL; 793 794 todr_attach(&tch); 795 } 796 797 void 798 setstatclockrate(int arg) 799 { 800 } 801
Indexes created Thu Sep 25 16:09:42 GMT 2025