clock.c revision 1.15
1 /* $NetBSD: clock.c,v 1.15 2007/12/09 20:27:49 jmcneill 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 1.15 2007/12/09 20:27:49 jmcneill 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 *); 169 170 CFATTACH_DECL(sysbeep, sizeof(struct device), 171 sysbeepmatch, sysbeepattach, NULL, NULL); 172 173 static int ppi_attached; 174 static pcppi_tag_t ppicookie; 175 #endif /* PCPPI */ 176 177 #ifdef CLOCKDEBUG 178 int clock_debug = 0; 179 #define DPRINTF(arg) if (clock_debug) printf arg 180 #else 181 #define DPRINTF(arg) 182 #endif 183 184 /* Used by lapic.c */ 185 unsigned int gettick(void); 186 void sysbeep(int, int); 187 static void tickle_tc(void); 188 189 static int clockintr(void *, struct intrframe *); 190 static void rtcinit(void); 191 static int rtcget(mc_todregs *); 192 static void rtcput(mc_todregs *); 193 194 static int cmoscheck(void); 195 196 static int clock_expandyear(int); 197 198 static unsigned int gettick_broken_latch(void); 199 200 static volatile uint32_t i8254_lastcount; 201 static volatile uint32_t i8254_offset; 202 static volatile int i8254_ticked; 203 204 /* to protect TC timer variables */ 205 static __cpu_simple_lock_t tmr_lock = __SIMPLELOCK_UNLOCKED; 206 207 inline u_int mc146818_read(void *, u_int); 208 inline void mc146818_write(void *, u_int, u_int); 209 210 u_int i8254_get_timecount(struct timecounter *); 211 static void rtc_register(void); 212 213 static struct timecounter i8254_timecounter = { 214 i8254_get_timecount, /* get_timecount */ 215 0, /* no poll_pps */ 216 ~0u, /* counter_mask */ 217 TIMER_FREQ, /* frequency */ 218 "i8254", /* name */ 219 100, /* quality */ 220 NULL, /* prev */ 221 NULL, /* next */ 222 }; 223 224 /* XXX use sc? */ 225 inline u_int 226 mc146818_read(void *sc, u_int reg) 227 { 228 229 outb(IO_RTC, reg); 230 return (inb(IO_RTC+1)); 231 } 232 233 /* XXX use sc? */ 234 inline void 235 mc146818_write(void *sc, u_int reg, u_int datum) 236 { 237 238 outb(IO_RTC, reg); 239 outb(IO_RTC+1, datum); 240 } 241 242 u_long rtclock_tval; /* i8254 reload value for countdown */ 243 int rtclock_init = 0; 244 245 int clock_broken_latch = 0; 246 247 #ifdef CLOCK_PARANOIA 248 static int ticks[6]; 249 #endif 250 /* 251 * i8254 latch check routine: 252 * National Geode (formerly Cyrix MediaGX) has a serious bug in 253 * its built-in i8254-compatible clock module. 254 * machdep sets the variable 'clock_broken_latch' to indicate it. 255 */ 256 257 static unsigned int 258 gettick_broken_latch(void) 259 { 260 int v1, v2, v3; 261 int w1, w2, w3; 262 int s; 263 264 /* Don't want someone screwing with the counter while we're here. */ 265 s = splhigh(); 266 __cpu_simple_lock(&tmr_lock); 267 v1 = inb(IO_TIMER1+TIMER_CNTR0); 268 v1 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 269 v2 = inb(IO_TIMER1+TIMER_CNTR0); 270 v2 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 271 v3 = inb(IO_TIMER1+TIMER_CNTR0); 272 v3 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 273 __cpu_simple_unlock(&tmr_lock); 274 splx(s); 275 276 #ifdef CLOCK_PARANOIA 277 if (clock_debug) { 278 ticks[0] = ticks[3]; 279 ticks[1] = ticks[4]; 280 ticks[2] = ticks[5]; 281 ticks[3] = v1; 282 ticks[4] = v2; 283 ticks[5] = v3; 284 } 285 #endif 286 287 if (v1 >= v2 && v2 >= v3 && v1 - v3 < 0x200) 288 return (v2); 289 290 #define _swap_val(a, b) do { \ 291 int c = a; \ 292 a = b; \ 293 b = c; \ 294 } while (0) 295 296 /* 297 * sort v1 v2 v3 298 */ 299 if (v1 < v2) 300 _swap_val(v1, v2); 301 if (v2 < v3) 302 _swap_val(v2, v3); 303 if (v1 < v2) 304 _swap_val(v1, v2); 305 306 /* 307 * compute the middle value 308 */ 309 310 if (v1 - v3 < 0x200) 311 return (v2); 312 313 w1 = v2 - v3; 314 w2 = v3 - v1 + rtclock_tval; 315 w3 = v1 - v2; 316 if (w1 >= w2) { 317 if (w1 >= w3) 318 return (v1); 319 } else { 320 if (w2 >= w3) 321 return (v2); 322 } 323 return (v3); 324 } 325 326 /* minimal initialization, enough for delay() */ 327 void 328 initrtclock(u_long freq) 329 { 330 u_long tval; 331 332 /* 333 * Compute timer_count, the count-down count the timer will be 334 * set to. Also, correctly round 335 * this by carrying an extra bit through the division. 336 */ 337 tval = (freq * 2) / (u_long) hz; 338 tval = (tval / 2) + (tval & 0x1); 339 340 /* initialize 8254 clock */ 341 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT); 342 343 /* Correct rounding will buy us a better precision in timekeeping */ 344 outb(IO_TIMER1+TIMER_CNTR0, tval % 256); 345 outb(IO_TIMER1+TIMER_CNTR0, tval / 256); 346 347 rtclock_tval = tval ? tval : 0xFFFF; 348 rtclock_init = 1; 349 } 350 351 void 352 startrtclock(void) 353 { 354 int s; 355 356 if (!rtclock_init) 357 initrtclock(TIMER_FREQ); 358 359 /* Check diagnostic status */ 360 if ((s = mc146818_read(NULL, NVRAM_DIAG)) != 0) { /* XXX softc */ 361 char bits[128]; 362 printf("RTC BIOS diagnostic error %s\n", 363 bitmask_snprintf(s, NVRAM_DIAG_BITS, bits, sizeof(bits))); 364 } 365 366 tc_init(&i8254_timecounter); 367 368 init_TSC(); 369 rtc_register(); 370 } 371 372 /* 373 * Must be called at splsched(). 374 */ 375 static void 376 tickle_tc(void) 377 { 378 #if defined(MULTIPROCESSOR) 379 struct cpu_info *ci = curcpu(); 380 /* 381 * If we are not the primary CPU, we're not allowed to do 382 * any more work. 383 */ 384 if (CPU_IS_PRIMARY(ci) == 0) 385 return; 386 #endif 387 if (rtclock_tval && timecounter->tc_get_timecount == i8254_get_timecount) { 388 __cpu_simple_lock(&tmr_lock); 389 if (i8254_ticked) 390 i8254_ticked = 0; 391 else { 392 i8254_offset += rtclock_tval; 393 i8254_lastcount = 0; 394 } 395 __cpu_simple_unlock(&tmr_lock); 396 } 397 398 } 399 400 static int 401 clockintr(void *arg, struct intrframe *frame) 402 { 403 tickle_tc(); 404 405 hardclock((struct clockframe *)frame); 406 407 #if NMCA > 0 408 if (MCA_system) { 409 /* Reset PS/2 clock interrupt by asserting bit 7 of port 0x61 */ 410 outb(0x61, inb(0x61) | 0x80); 411 } 412 #endif 413 return -1; 414 } 415 416 u_int 417 i8254_get_timecount(struct timecounter *tc) 418 { 419 u_int count; 420 uint16_t rdval; 421 int s; 422 423 /* Don't want someone screwing with the counter while we're here. */ 424 s = splhigh(); 425 __cpu_simple_lock(&tmr_lock); 426 /* Select timer0 and latch counter value. */ 427 outb(IO_TIMER1 + TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 428 /* insb to make the read atomic */ 429 insb(IO_TIMER1+TIMER_CNTR0, &rdval, 2); 430 count = rtclock_tval - rdval; 431 if (rtclock_tval && (count < i8254_lastcount || !i8254_ticked)) { 432 i8254_ticked = 1; 433 i8254_offset += rtclock_tval; 434 } 435 i8254_lastcount = count; 436 count += i8254_offset; 437 __cpu_simple_unlock(&tmr_lock); 438 splx(s); 439 440 return (count); 441 } 442 443 unsigned int 444 gettick(void) 445 { 446 uint16_t rdval; 447 int s; 448 449 if (clock_broken_latch) 450 return (gettick_broken_latch()); 451 452 /* Don't want someone screwing with the counter while we're here. */ 453 s = splhigh(); 454 __cpu_simple_lock(&tmr_lock); 455 /* Select counter 0 and latch it. */ 456 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 457 /* insb to make the read atomic */ 458 insb(IO_TIMER1+TIMER_CNTR0, &rdval, 2); 459 __cpu_simple_unlock(&tmr_lock); 460 splx(s); 461 462 return rdval; 463 } 464 465 /* 466 * Wait approximately `n' microseconds. 467 * Relies on timer 1 counting down from (TIMER_FREQ / hz) at TIMER_FREQ Hz. 468 * Note: timer had better have been programmed before this is first used! 469 * (Note that we use `rate generator' mode, which counts at 1:1; `square 470 * wave' mode counts at 2:1). 471 * Don't rely on this being particularly accurate. 472 */ 473 void 474 i8254_delay(unsigned int n) 475 { 476 unsigned int cur_tick, initial_tick; 477 int remaining; 478 static const int delaytab[26] = { 479 0, 2, 3, 4, 5, 6, 7, 9, 10, 11, 480 12, 13, 15, 16, 17, 18, 19, 21, 22, 23, 481 24, 25, 27, 28, 29, 30, 482 }; 483 484 /* allow DELAY() to be used before startrtclock() */ 485 if (!rtclock_init) 486 initrtclock(TIMER_FREQ); 487 488 /* 489 * Read the counter first, so that the rest of the setup overhead is 490 * counted. 491 */ 492 initial_tick = gettick(); 493 494 if (n <= 25) 495 remaining = delaytab[n]; 496 else if (n <= UINT_MAX / TIMER_FREQ) { 497 /* 498 * For unsigned arithmetic, division can be replaced with 499 * multiplication with the inverse and a shift. 500 */ 501 remaining = n * TIMER_FREQ / 1000000; 502 } else { 503 /* This is a very long delay. 504 * Being slow here doesn't matter. 505 */ 506 remaining = (unsigned long long) n * TIMER_FREQ / 1000000; 507 } 508 509 while (remaining > 0) { 510 #ifdef CLOCK_PARANOIA 511 int delta; 512 cur_tick = gettick(); 513 if (cur_tick > initial_tick) 514 delta = rtclock_tval - (cur_tick - initial_tick); 515 else 516 delta = initial_tick - cur_tick; 517 if (delta < 0 || delta >= rtclock_tval / 2) { 518 DPRINTF(("delay: ignore ticks %.4x-%.4x", 519 initial_tick, cur_tick)); 520 if (clock_broken_latch) { 521 DPRINTF((" (%.4x %.4x %.4x %.4x %.4x %.4x)\n", 522 ticks[0], ticks[1], ticks[2], 523 ticks[3], ticks[4], ticks[5])); 524 } else { 525 DPRINTF(("\n")); 526 } 527 } else 528 remaining -= delta; 529 #else 530 cur_tick = gettick(); 531 if (cur_tick > initial_tick) 532 remaining -= rtclock_tval - (cur_tick - initial_tick); 533 else 534 remaining -= initial_tick - cur_tick; 535 #endif 536 initial_tick = cur_tick; 537 } 538 } 539 540 #if (NPCPPI > 0) 541 int 542 sysbeepmatch(struct device *parent, struct cfdata *match, 543 void *aux) 544 { 545 return (!ppi_attached); 546 } 547 548 void 549 sysbeepattach(struct device *parent, struct device *self, 550 void *aux) 551 { 552 aprint_naive("\n"); 553 aprint_normal("\n"); 554 555 ppicookie = ((struct pcppi_attach_args *)aux)->pa_cookie; 556 ppi_attached = 1; 557 558 if (!pmf_device_register(self, NULL, NULL)) 559 aprint_error_dev(self, "couldn't establish power handler\n"); 560 } 561 #endif 562 563 void 564 sysbeep(int pitch, int period) 565 { 566 #if (NPCPPI > 0) 567 if (ppi_attached) 568 pcppi_bell(ppicookie, pitch, period, 0); 569 #endif 570 } 571 572 void 573 i8254_initclocks(void) 574 { 575 576 /* 577 * XXX If you're doing strange things with multiple clocks, you might 578 * want to keep track of clock handlers. 579 */ 580 (void)isa_intr_establish(NULL, 0, IST_PULSE, IPL_CLOCK, 581 (int (*)(void *))clockintr, 0); 582 } 583 584 static void 585 rtcinit(void) 586 { 587 static int first_rtcopen_ever = 1; 588 589 if (!first_rtcopen_ever) 590 return; 591 first_rtcopen_ever = 0; 592 593 mc146818_write(NULL, MC_REGA, /* XXX softc */ 594 MC_BASE_32_KHz | MC_RATE_1024_Hz); 595 mc146818_write(NULL, MC_REGB, MC_REGB_24HR); /* XXX softc */ 596 } 597 598 static int 599 rtcget(mc_todregs *regs) 600 { 601 602 rtcinit(); 603 if ((mc146818_read(NULL, MC_REGD) & MC_REGD_VRT) == 0) /* XXX softc */ 604 return (-1); 605 MC146818_GETTOD(NULL, regs); /* XXX softc */ 606 return (0); 607 } 608 609 static void 610 rtcput(mc_todregs *regs) 611 { 612 613 rtcinit(); 614 MC146818_PUTTOD(NULL, regs); /* XXX softc */ 615 } 616 617 /* 618 * check whether the CMOS layout is "standard"-like (ie, not PS/2-like), 619 * to be called at splclock() 620 */ 621 static int 622 cmoscheck(void) 623 { 624 int i; 625 unsigned short cksum = 0; 626 627 for (i = 0x10; i <= 0x2d; i++) 628 cksum += mc146818_read(NULL, i); /* XXX softc */ 629 630 return (cksum == (mc146818_read(NULL, 0x2e) << 8) 631 + mc146818_read(NULL, 0x2f)); 632 } 633 634 #if NMCA > 0 635 /* 636 * Check whether the CMOS layout is PS/2 like, to be called at splclock(). 637 */ 638 static int cmoscheckps2(void); 639 static int 640 cmoscheckps2(void) 641 { 642 #if 0 643 /* Disabled until I find out the CRC checksum algorithm IBM uses */ 644 int i; 645 unsigned short cksum = 0; 646 647 for (i = 0x10; i <= 0x31; i++) 648 cksum += mc146818_read(NULL, i); /* XXX softc */ 649 650 return (cksum == (mc146818_read(NULL, 0x32) << 8) 651 + mc146818_read(NULL, 0x33)); 652 #else 653 /* Check 'incorrect checksum' bit of IBM PS/2 Diagnostic Status Byte */ 654 return ((mc146818_read(NULL, NVRAM_DIAG) & (1<<6)) == 0); 655 #endif 656 } 657 #endif /* NMCA > 0 */ 658 659 /* 660 * patchable to control century byte handling: 661 * 1: always update 662 * -1: never touch 663 * 0: try to figure out itself 664 */ 665 int rtc_update_century = 0; 666 667 /* 668 * Expand a two-digit year as read from the clock chip 669 * into full width. 670 * Being here, deal with the CMOS century byte. 671 */ 672 static int centb = NVRAM_CENTURY; 673 static int 674 clock_expandyear(int clockyear) 675 { 676 int s, clockcentury, cmoscentury; 677 678 clockcentury = (clockyear < 70) ? 20 : 19; 679 clockyear += 100 * clockcentury; 680 681 if (rtc_update_century < 0) 682 return (clockyear); 683 684 s = splclock(); 685 if (cmoscheck()) 686 cmoscentury = mc146818_read(NULL, NVRAM_CENTURY); 687 #if NMCA > 0 688 else if (MCA_system && cmoscheckps2()) 689 cmoscentury = mc146818_read(NULL, (centb = 0x37)); 690 #endif 691 else 692 cmoscentury = 0; 693 splx(s); 694 if (!cmoscentury) { 695 #ifdef DIAGNOSTIC 696 printf("clock: unknown CMOS layout\n"); 697 #endif 698 return (clockyear); 699 } 700 cmoscentury = bcdtobin(cmoscentury); 701 702 if (cmoscentury != clockcentury) { 703 /* XXX note: saying "century is 20" might confuse the naive. */ 704 printf("WARNING: NVRAM century is %d but RTC year is %d\n", 705 cmoscentury, clockyear); 706 707 /* Kludge to roll over century. */ 708 if ((rtc_update_century > 0) || 709 ((cmoscentury == 19) && (clockcentury == 20) && 710 (clockyear == 2000))) { 711 printf("WARNING: Setting NVRAM century to %d\n", 712 clockcentury); 713 s = splclock(); 714 mc146818_write(NULL, centb, bintobcd(clockcentury)); 715 splx(s); 716 } 717 } else if (cmoscentury == 19 && rtc_update_century == 0) 718 rtc_update_century = 1; /* will update later in resettodr() */ 719 720 return (clockyear); 721 } 722 723 static int 724 rtc_get_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 725 { 726 int s; 727 mc_todregs rtclk; 728 729 s = splclock(); 730 if (rtcget(&rtclk)) { 731 splx(s); 732 return -1; 733 } 734 splx(s); 735 736 dt->dt_sec = bcdtobin(rtclk[MC_SEC]); 737 dt->dt_min = bcdtobin(rtclk[MC_MIN]); 738 dt->dt_hour = bcdtobin(rtclk[MC_HOUR]); 739 dt->dt_day = bcdtobin(rtclk[MC_DOM]); 740 dt->dt_mon = bcdtobin(rtclk[MC_MONTH]); 741 dt->dt_year = clock_expandyear(bcdtobin(rtclk[MC_YEAR])); 742 743 return 0; 744 } 745 746 static int 747 rtc_set_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 748 { 749 mc_todregs rtclk; 750 int century; 751 int s; 752 753 s = splclock(); 754 if (rtcget(&rtclk)) 755 memset(&rtclk, 0, sizeof(rtclk)); 756 splx(s); 757 758 rtclk[MC_SEC] = bintobcd(dt->dt_sec); 759 rtclk[MC_MIN] = bintobcd(dt->dt_min); 760 rtclk[MC_HOUR] = bintobcd(dt->dt_hour); 761 rtclk[MC_DOW] = dt->dt_wday + 1; 762 rtclk[MC_YEAR] = bintobcd(dt->dt_year % 100); 763 rtclk[MC_MONTH] = bintobcd(dt->dt_mon); 764 rtclk[MC_DOM] = bintobcd(dt->dt_day); 765 766 #ifdef DEBUG_CLOCK 767 printf("setclock: %x/%x/%x %x:%x:%x\n", rtclk[MC_YEAR], rtclk[MC_MONTH], 768 rtclk[MC_DOM], rtclk[MC_HOUR], rtclk[MC_MIN], rtclk[MC_SEC]); 769 #endif 770 s = splclock(); 771 rtcput(&rtclk); 772 if (rtc_update_century > 0) { 773 century = bintobcd(dt->dt_year / 100); 774 mc146818_write(NULL, centb, century); /* XXX softc */ 775 } 776 splx(s); 777 return 0; 778 779 } 780 781 static void 782 rtc_register(void) 783 { 784 static struct todr_chip_handle tch; 785 tch.todr_gettime_ymdhms = rtc_get_ymdhms; 786 tch.todr_settime_ymdhms = rtc_set_ymdhms; 787 tch.todr_setwen = NULL; 788 789 todr_attach(&tch); 790 } 791 792 void 793 setstatclockrate(int arg) 794 { 795 } 796
Indexes created Thu Sep 25 16:09:42 GMT 2025