clock.c revision 1.19
1 /* $NetBSD: clock.c,v 1.19 2008/01/04 20:38:01 christos 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 1.19 2008/01/04 20:38:01 christos 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 <x86/lock.h> 152 #include <dev/clock_subr.h> 153 #include <machine/specialreg.h> 154 155 #include "config_time.h" /* for CONFIG_TIME */ 156 157 #ifndef __x86_64__ 158 #include "mca.h" 159 #endif 160 #if NMCA > 0 161 #include <machine/mca_machdep.h> /* for MCA_system */ 162 #endif 163 164 #include "pcppi.h" 165 #if (NPCPPI > 0) 166 #include <dev/isa/pcppivar.h> 167 168 int sysbeepmatch(struct device *, struct cfdata *, void *); 169 void sysbeepattach(struct device *, struct device *, void *); 170 int sysbeepdetach(device_t, int); 171 172 CFATTACH_DECL(sysbeep, sizeof(struct device), 173 sysbeepmatch, sysbeepattach, sysbeepdetach, NULL); 174 175 static int ppi_attached; 176 static pcppi_tag_t ppicookie; 177 #endif /* PCPPI */ 178 179 #ifdef CLOCKDEBUG 180 int clock_debug = 0; 181 #define DPRINTF(arg) if (clock_debug) printf arg 182 #else 183 #define DPRINTF(arg) 184 #endif 185 186 /* Used by lapic.c */ 187 unsigned int gettick(void); 188 void sysbeep(int, int); 189 static void tickle_tc(void); 190 191 static int clockintr(void *, struct intrframe *); 192 static void rtcinit(void); 193 static int rtcget(mc_todregs *); 194 static void rtcput(mc_todregs *); 195 196 static int cmoscheck(void); 197 198 static int clock_expandyear(int); 199 int sysbeepdetach(device_t, int); 200 201 static unsigned int gettick_broken_latch(void); 202 203 static volatile uint32_t i8254_lastcount; 204 static volatile uint32_t i8254_offset; 205 static volatile int i8254_ticked; 206 207 /* to protect TC timer variables */ 208 static __cpu_simple_lock_t tmr_lock = __SIMPLELOCK_UNLOCKED; 209 210 inline u_int mc146818_read(void *, u_int); 211 inline void mc146818_write(void *, u_int, u_int); 212 213 u_int i8254_get_timecount(struct timecounter *); 214 static void rtc_register(void); 215 216 static struct timecounter i8254_timecounter = { 217 i8254_get_timecount, /* get_timecount */ 218 0, /* no poll_pps */ 219 ~0u, /* counter_mask */ 220 TIMER_FREQ, /* frequency */ 221 "i8254", /* name */ 222 100, /* quality */ 223 NULL, /* prev */ 224 NULL, /* next */ 225 }; 226 227 /* XXX use sc? */ 228 inline u_int 229 mc146818_read(void *sc, u_int reg) 230 { 231 232 outb(IO_RTC, reg); 233 return (inb(IO_RTC+1)); 234 } 235 236 /* XXX use sc? */ 237 inline void 238 mc146818_write(void *sc, u_int reg, u_int datum) 239 { 240 241 outb(IO_RTC, reg); 242 outb(IO_RTC+1, datum); 243 } 244 245 u_long rtclock_tval; /* i8254 reload value for countdown */ 246 int rtclock_init = 0; 247 248 int clock_broken_latch = 0; 249 250 #ifdef CLOCK_PARANOIA 251 static int ticks[6]; 252 #endif 253 /* 254 * i8254 latch check routine: 255 * National Geode (formerly Cyrix MediaGX) has a serious bug in 256 * its built-in i8254-compatible clock module. 257 * machdep sets the variable 'clock_broken_latch' to indicate it. 258 */ 259 260 static unsigned int 261 gettick_broken_latch(void) 262 { 263 int v1, v2, v3; 264 int w1, w2, w3; 265 int s; 266 267 /* Don't want someone screwing with the counter while we're here. */ 268 s = splhigh(); 269 __cpu_simple_lock(&tmr_lock); 270 v1 = inb(IO_TIMER1+TIMER_CNTR0); 271 v1 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 272 v2 = inb(IO_TIMER1+TIMER_CNTR0); 273 v2 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 274 v3 = inb(IO_TIMER1+TIMER_CNTR0); 275 v3 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 276 __cpu_simple_unlock(&tmr_lock); 277 splx(s); 278 279 #ifdef CLOCK_PARANOIA 280 if (clock_debug) { 281 ticks[0] = ticks[3]; 282 ticks[1] = ticks[4]; 283 ticks[2] = ticks[5]; 284 ticks[3] = v1; 285 ticks[4] = v2; 286 ticks[5] = v3; 287 } 288 #endif 289 290 if (v1 >= v2 && v2 >= v3 && v1 - v3 < 0x200) 291 return (v2); 292 293 #define _swap_val(a, b) do { \ 294 int c = a; \ 295 a = b; \ 296 b = c; \ 297 } while (0) 298 299 /* 300 * sort v1 v2 v3 301 */ 302 if (v1 < v2) 303 _swap_val(v1, v2); 304 if (v2 < v3) 305 _swap_val(v2, v3); 306 if (v1 < v2) 307 _swap_val(v1, v2); 308 309 /* 310 * compute the middle value 311 */ 312 313 if (v1 - v3 < 0x200) 314 return (v2); 315 316 w1 = v2 - v3; 317 w2 = v3 - v1 + rtclock_tval; 318 w3 = v1 - v2; 319 if (w1 >= w2) { 320 if (w1 >= w3) 321 return (v1); 322 } else { 323 if (w2 >= w3) 324 return (v2); 325 } 326 return (v3); 327 } 328 329 /* minimal initialization, enough for delay() */ 330 void 331 initrtclock(u_long freq) 332 { 333 u_long tval; 334 335 /* 336 * Compute timer_count, the count-down count the timer will be 337 * set to. Also, correctly round 338 * this by carrying an extra bit through the division. 339 */ 340 tval = (freq * 2) / (u_long) hz; 341 tval = (tval / 2) + (tval & 0x1); 342 343 /* initialize 8254 clock */ 344 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT); 345 346 /* Correct rounding will buy us a better precision in timekeeping */ 347 outb(IO_TIMER1+TIMER_CNTR0, tval % 256); 348 outb(IO_TIMER1+TIMER_CNTR0, tval / 256); 349 350 rtclock_tval = tval ? tval : 0xFFFF; 351 rtclock_init = 1; 352 } 353 354 void 355 startrtclock(void) 356 { 357 int s; 358 359 if (!rtclock_init) 360 initrtclock(TIMER_FREQ); 361 362 /* Check diagnostic status */ 363 if ((s = mc146818_read(NULL, NVRAM_DIAG)) != 0) { /* XXX softc */ 364 char bits[128]; 365 printf("RTC BIOS diagnostic error %s\n", 366 bitmask_snprintf(s, NVRAM_DIAG_BITS, bits, sizeof(bits))); 367 } 368 369 tc_init(&i8254_timecounter); 370 371 init_TSC(); 372 rtc_register(); 373 } 374 375 /* 376 * Must be called at splsched(). 377 */ 378 static void 379 tickle_tc(void) 380 { 381 #if defined(MULTIPROCESSOR) 382 struct cpu_info *ci = curcpu(); 383 /* 384 * If we are not the primary CPU, we're not allowed to do 385 * any more work. 386 */ 387 if (CPU_IS_PRIMARY(ci) == 0) 388 return; 389 #endif 390 if (rtclock_tval && timecounter->tc_get_timecount == i8254_get_timecount) { 391 __cpu_simple_lock(&tmr_lock); 392 if (i8254_ticked) 393 i8254_ticked = 0; 394 else { 395 i8254_offset += rtclock_tval; 396 i8254_lastcount = 0; 397 } 398 __cpu_simple_unlock(&tmr_lock); 399 } 400 401 } 402 403 static int 404 clockintr(void *arg, struct intrframe *frame) 405 { 406 tickle_tc(); 407 408 hardclock((struct clockframe *)frame); 409 410 #if NMCA > 0 411 if (MCA_system) { 412 /* Reset PS/2 clock interrupt by asserting bit 7 of port 0x61 */ 413 outb(0x61, inb(0x61) | 0x80); 414 } 415 #endif 416 return -1; 417 } 418 419 u_int 420 i8254_get_timecount(struct timecounter *tc) 421 { 422 u_int count; 423 uint16_t rdval; 424 int s; 425 426 /* Don't want someone screwing with the counter while we're here. */ 427 s = splhigh(); 428 __cpu_simple_lock(&tmr_lock); 429 /* Select timer0 and latch counter value. */ 430 outb(IO_TIMER1 + TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 431 /* insb to make the read atomic */ 432 insb(IO_TIMER1+TIMER_CNTR0, &rdval, 2); 433 count = rtclock_tval - rdval; 434 if (rtclock_tval && (count < i8254_lastcount || !i8254_ticked)) { 435 i8254_ticked = 1; 436 i8254_offset += rtclock_tval; 437 } 438 i8254_lastcount = count; 439 count += i8254_offset; 440 __cpu_simple_unlock(&tmr_lock); 441 splx(s); 442 443 return (count); 444 } 445 446 unsigned int 447 gettick(void) 448 { 449 uint16_t rdval; 450 int s; 451 452 if (clock_broken_latch) 453 return (gettick_broken_latch()); 454 455 /* Don't want someone screwing with the counter while we're here. */ 456 s = splhigh(); 457 __cpu_simple_lock(&tmr_lock); 458 /* Select counter 0 and latch it. */ 459 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 460 /* insb to make the read atomic */ 461 insb(IO_TIMER1+TIMER_CNTR0, &rdval, 2); 462 __cpu_simple_unlock(&tmr_lock); 463 splx(s); 464 465 return rdval; 466 } 467 468 /* 469 * Wait approximately `n' microseconds. 470 * Relies on timer 1 counting down from (TIMER_FREQ / hz) at TIMER_FREQ Hz. 471 * Note: timer had better have been programmed before this is first used! 472 * (Note that we use `rate generator' mode, which counts at 1:1; `square 473 * wave' mode counts at 2:1). 474 * Don't rely on this being particularly accurate. 475 */ 476 void 477 i8254_delay(unsigned int n) 478 { 479 unsigned int cur_tick, initial_tick; 480 int remaining; 481 482 /* allow DELAY() to be used before startrtclock() */ 483 if (!rtclock_init) 484 initrtclock(TIMER_FREQ); 485 486 /* 487 * Read the counter first, so that the rest of the setup overhead is 488 * counted. 489 */ 490 initial_tick = gettick(); 491 492 if (n <= UINT_MAX / TIMER_FREQ) { 493 /* 494 * For unsigned arithmetic, division can be replaced with 495 * multiplication with the inverse and a shift. 496 */ 497 remaining = n * TIMER_FREQ / 1000000; 498 } else { 499 /* This is a very long delay. 500 * Being slow here doesn't matter. 501 */ 502 remaining = (unsigned long long) n * TIMER_FREQ / 1000000; 503 } 504 505 while (remaining > 0) { 506 #ifdef CLOCK_PARANOIA 507 int delta; 508 cur_tick = gettick(); 509 if (cur_tick > initial_tick) 510 delta = rtclock_tval - (cur_tick - initial_tick); 511 else 512 delta = initial_tick - cur_tick; 513 if (delta < 0 || delta >= rtclock_tval / 2) { 514 DPRINTF(("delay: ignore ticks %.4x-%.4x", 515 initial_tick, cur_tick)); 516 if (clock_broken_latch) { 517 DPRINTF((" (%.4x %.4x %.4x %.4x %.4x %.4x)\n", 518 ticks[0], ticks[1], ticks[2], 519 ticks[3], ticks[4], ticks[5])); 520 } else { 521 DPRINTF(("\n")); 522 } 523 } else 524 remaining -= delta; 525 #else 526 cur_tick = gettick(); 527 if (cur_tick > initial_tick) 528 remaining -= rtclock_tval - (cur_tick - initial_tick); 529 else 530 remaining -= initial_tick - cur_tick; 531 #endif 532 initial_tick = cur_tick; 533 } 534 } 535 536 #if (NPCPPI > 0) 537 int 538 sysbeepmatch(struct device *parent, struct cfdata *match, 539 void *aux) 540 { 541 return (!ppi_attached); 542 } 543 544 void 545 sysbeepattach(struct device *parent, struct device *self, 546 void *aux) 547 { 548 aprint_naive("\n"); 549 aprint_normal("\n"); 550 551 ppicookie = ((struct pcppi_attach_args *)aux)->pa_cookie; 552 ppi_attached = 1; 553 554 if (!pmf_device_register(self, NULL, NULL)) 555 aprint_error_dev(self, "couldn't establish power handler\n"); 556 } 557 #endif 558 559 int 560 sysbeepdetach(device_t self, int flags) 561 { 562 pmf_device_deregister(self); 563 #if (NPCPPI > 0) 564 ppi_attached = 0; 565 #endif 566 return 0; 567 } 568 569 void 570 sysbeep(int pitch, int period) 571 { 572 #if (NPCPPI > 0) 573 if (ppi_attached) 574 pcppi_bell(ppicookie, pitch, period, 0); 575 #endif 576 } 577 578 void 579 i8254_initclocks(void) 580 { 581 582 /* 583 * XXX If you're doing strange things with multiple clocks, you might 584 * want to keep track of clock handlers. 585 */ 586 (void)isa_intr_establish(NULL, 0, IST_PULSE, IPL_CLOCK, 587 (int (*)(void *))clockintr, 0); 588 } 589 590 static void 591 rtcinit(void) 592 { 593 static int first_rtcopen_ever = 1; 594 595 if (!first_rtcopen_ever) 596 return; 597 first_rtcopen_ever = 0; 598 599 mc146818_write(NULL, MC_REGA, /* XXX softc */ 600 MC_BASE_32_KHz | MC_RATE_1024_Hz); 601 mc146818_write(NULL, MC_REGB, MC_REGB_24HR); /* XXX softc */ 602 } 603 604 static int 605 rtcget(mc_todregs *regs) 606 { 607 608 rtcinit(); 609 if ((mc146818_read(NULL, MC_REGD) & MC_REGD_VRT) == 0) /* XXX softc */ 610 return (-1); 611 MC146818_GETTOD(NULL, regs); /* XXX softc */ 612 return (0); 613 } 614 615 static void 616 rtcput(mc_todregs *regs) 617 { 618 619 rtcinit(); 620 MC146818_PUTTOD(NULL, regs); /* XXX softc */ 621 } 622 623 /* 624 * check whether the CMOS layout is "standard"-like (ie, not PS/2-like), 625 * to be called at splclock() 626 */ 627 static int 628 cmoscheck(void) 629 { 630 int i; 631 unsigned short cksum = 0; 632 633 for (i = 0x10; i <= 0x2d; i++) 634 cksum += mc146818_read(NULL, i); /* XXX softc */ 635 636 return (cksum == (mc146818_read(NULL, 0x2e) << 8) 637 + mc146818_read(NULL, 0x2f)); 638 } 639 640 #if NMCA > 0 641 /* 642 * Check whether the CMOS layout is PS/2 like, to be called at splclock(). 643 */ 644 static int cmoscheckps2(void); 645 static int 646 cmoscheckps2(void) 647 { 648 #if 0 649 /* Disabled until I find out the CRC checksum algorithm IBM uses */ 650 int i; 651 unsigned short cksum = 0; 652 653 for (i = 0x10; i <= 0x31; i++) 654 cksum += mc146818_read(NULL, i); /* XXX softc */ 655 656 return (cksum == (mc146818_read(NULL, 0x32) << 8) 657 + mc146818_read(NULL, 0x33)); 658 #else 659 /* Check 'incorrect checksum' bit of IBM PS/2 Diagnostic Status Byte */ 660 return ((mc146818_read(NULL, NVRAM_DIAG) & (1<<6)) == 0); 661 #endif 662 } 663 #endif /* NMCA > 0 */ 664 665 /* 666 * patchable to control century byte handling: 667 * 1: always update 668 * -1: never touch 669 * 0: try to figure out itself 670 */ 671 int rtc_update_century = 0; 672 673 /* 674 * Expand a two-digit year as read from the clock chip 675 * into full width. 676 * Being here, deal with the CMOS century byte. 677 */ 678 static int centb = NVRAM_CENTURY; 679 static int 680 clock_expandyear(int clockyear) 681 { 682 int s, clockcentury, cmoscentury; 683 684 clockcentury = (clockyear < 70) ? 20 : 19; 685 clockyear += 100 * clockcentury; 686 687 if (rtc_update_century < 0) 688 return (clockyear); 689 690 s = splclock(); 691 if (cmoscheck()) 692 cmoscentury = mc146818_read(NULL, NVRAM_CENTURY); 693 #if NMCA > 0 694 else if (MCA_system && cmoscheckps2()) 695 cmoscentury = mc146818_read(NULL, (centb = 0x37)); 696 #endif 697 else 698 cmoscentury = 0; 699 splx(s); 700 if (!cmoscentury) { 701 #ifdef DIAGNOSTIC 702 printf("clock: unknown CMOS layout\n"); 703 #endif 704 return (clockyear); 705 } 706 cmoscentury = bcdtobin(cmoscentury); 707 708 if (cmoscentury != clockcentury) { 709 /* XXX note: saying "century is 20" might confuse the naive. */ 710 printf("WARNING: NVRAM century is %d but RTC year is %d\n", 711 cmoscentury, clockyear); 712 713 /* Kludge to roll over century. */ 714 if ((rtc_update_century > 0) || 715 ((cmoscentury == 19) && (clockcentury == 20) && 716 (clockyear == 2000))) { 717 printf("WARNING: Setting NVRAM century to %d\n", 718 clockcentury); 719 s = splclock(); 720 mc146818_write(NULL, centb, bintobcd(clockcentury)); 721 splx(s); 722 } 723 } else if (cmoscentury == 19 && rtc_update_century == 0) 724 rtc_update_century = 1; /* will update later in resettodr() */ 725 726 return (clockyear); 727 } 728 729 static int 730 rtc_get_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 731 { 732 int s; 733 mc_todregs rtclk; 734 735 s = splclock(); 736 if (rtcget(&rtclk)) { 737 splx(s); 738 return -1; 739 } 740 splx(s); 741 742 dt->dt_sec = bcdtobin(rtclk[MC_SEC]); 743 dt->dt_min = bcdtobin(rtclk[MC_MIN]); 744 dt->dt_hour = bcdtobin(rtclk[MC_HOUR]); 745 dt->dt_day = bcdtobin(rtclk[MC_DOM]); 746 dt->dt_mon = bcdtobin(rtclk[MC_MONTH]); 747 dt->dt_year = clock_expandyear(bcdtobin(rtclk[MC_YEAR])); 748 749 return 0; 750 } 751 752 static int 753 rtc_set_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 754 { 755 mc_todregs rtclk; 756 int century; 757 int s; 758 759 s = splclock(); 760 if (rtcget(&rtclk)) 761 memset(&rtclk, 0, sizeof(rtclk)); 762 splx(s); 763 764 rtclk[MC_SEC] = bintobcd(dt->dt_sec); 765 rtclk[MC_MIN] = bintobcd(dt->dt_min); 766 rtclk[MC_HOUR] = bintobcd(dt->dt_hour); 767 rtclk[MC_DOW] = dt->dt_wday + 1; 768 rtclk[MC_YEAR] = bintobcd(dt->dt_year % 100); 769 rtclk[MC_MONTH] = bintobcd(dt->dt_mon); 770 rtclk[MC_DOM] = bintobcd(dt->dt_day); 771 772 #ifdef DEBUG_CLOCK 773 printf("setclock: %x/%x/%x %x:%x:%x\n", rtclk[MC_YEAR], rtclk[MC_MONTH], 774 rtclk[MC_DOM], rtclk[MC_HOUR], rtclk[MC_MIN], rtclk[MC_SEC]); 775 #endif 776 s = splclock(); 777 rtcput(&rtclk); 778 if (rtc_update_century > 0) { 779 century = bintobcd(dt->dt_year / 100); 780 mc146818_write(NULL, centb, century); /* XXX softc */ 781 } 782 splx(s); 783 return 0; 784 785 } 786 787 static void 788 rtc_register(void) 789 { 790 static struct todr_chip_handle tch; 791 tch.todr_gettime_ymdhms = rtc_get_ymdhms; 792 tch.todr_settime_ymdhms = rtc_set_ymdhms; 793 tch.todr_setwen = NULL; 794 795 todr_attach(&tch); 796 } 797 798 void 799 setstatclockrate(int arg) 800 { 801 } 802
Indexes created Fri Sep 26 20:09:58 GMT 2025