clock.c revision 1.27
1 /* $NetBSD: clock.c,v 1.27 2008/03/05 22:47:53 cube 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 1.27 2008/03/05 22:47:53 cube 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 #include <sys/cpu.h> 140 #include <sys/intr.h> 141 142 #include <machine/pio.h> 143 #include <machine/cpufunc.h> 144 #include <machine/lock.h> 145 146 #include <dev/isa/isareg.h> 147 #include <dev/isa/isavar.h> 148 #include <dev/ic/mc146818reg.h> 149 #include <dev/ic/i8253reg.h> 150 #include <i386/isa/nvram.h> 151 #include <x86/x86/tsc.h> 152 #include <x86/lock.h> 153 #include <dev/clock_subr.h> 154 #include <machine/specialreg.h> 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(device_t, cfdata_t, void *); 168 void sysbeepattach(device_t, device_t, void *); 169 int sysbeepdetach(device_t, int); 170 171 CFATTACH_DECL_NEW(sysbeep, 0, 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 && 434 (!i8254_ticked || rtclock_tval == 0xFFFF))) { 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(device_t parent, cfdata_t match, void *aux) 539 { 540 return (!ppi_attached); 541 } 542 543 void 544 sysbeepattach(device_t parent, device_t self, void *aux) 545 { 546 aprint_naive("\n"); 547 aprint_normal("\n"); 548 549 ppicookie = ((struct pcppi_attach_args *)aux)->pa_cookie; 550 ppi_attached = 1; 551 552 if (!pmf_device_register(self, NULL, NULL)) 553 aprint_error_dev(self, "couldn't establish power handler\n"); 554 } 555 556 int 557 sysbeepdetach(device_t self, int flags) 558 { 559 pmf_device_deregister(self); 560 ppi_attached = 0; 561 return 0; 562 } 563 #endif 564 565 void 566 sysbeep(int pitch, int period) 567 { 568 #if (NPCPPI > 0) 569 if (ppi_attached) 570 pcppi_bell(ppicookie, pitch, period, 0); 571 #endif 572 } 573 574 void 575 i8254_initclocks(void) 576 { 577 578 /* 579 * XXX If you're doing strange things with multiple clocks, you might 580 * want to keep track of clock handlers. 581 */ 582 (void)isa_intr_establish(NULL, 0, IST_PULSE, IPL_CLOCK, 583 (int (*)(void *))clockintr, 0); 584 } 585 586 static void 587 rtcinit(void) 588 { 589 static int first_rtcopen_ever = 1; 590 591 if (!first_rtcopen_ever) 592 return; 593 first_rtcopen_ever = 0; 594 595 mc146818_write(NULL, MC_REGA, /* XXX softc */ 596 MC_BASE_32_KHz | MC_RATE_1024_Hz); 597 mc146818_write(NULL, MC_REGB, MC_REGB_24HR); /* XXX softc */ 598 } 599 600 static int 601 rtcget(mc_todregs *regs) 602 { 603 604 rtcinit(); 605 if ((mc146818_read(NULL, MC_REGD) & MC_REGD_VRT) == 0) /* XXX softc */ 606 return (-1); 607 MC146818_GETTOD(NULL, regs); /* XXX softc */ 608 return (0); 609 } 610 611 static void 612 rtcput(mc_todregs *regs) 613 { 614 615 rtcinit(); 616 MC146818_PUTTOD(NULL, regs); /* XXX softc */ 617 } 618 619 /* 620 * check whether the CMOS layout is "standard"-like (ie, not PS/2-like), 621 * to be called at splclock() 622 */ 623 static int 624 cmoscheck(void) 625 { 626 int i; 627 unsigned short cksum = 0; 628 629 for (i = 0x10; i <= 0x2d; i++) 630 cksum += mc146818_read(NULL, i); /* XXX softc */ 631 632 return (cksum == (mc146818_read(NULL, 0x2e) << 8) 633 + mc146818_read(NULL, 0x2f)); 634 } 635 636 #if NMCA > 0 637 /* 638 * Check whether the CMOS layout is PS/2 like, to be called at splclock(). 639 */ 640 static int cmoscheckps2(void); 641 static int 642 cmoscheckps2(void) 643 { 644 #if 0 645 /* Disabled until I find out the CRC checksum algorithm IBM uses */ 646 int i; 647 unsigned short cksum = 0; 648 649 for (i = 0x10; i <= 0x31; i++) 650 cksum += mc146818_read(NULL, i); /* XXX softc */ 651 652 return (cksum == (mc146818_read(NULL, 0x32) << 8) 653 + mc146818_read(NULL, 0x33)); 654 #else 655 /* Check 'incorrect checksum' bit of IBM PS/2 Diagnostic Status Byte */ 656 return ((mc146818_read(NULL, NVRAM_DIAG) & (1<<6)) == 0); 657 #endif 658 } 659 #endif /* NMCA > 0 */ 660 661 /* 662 * patchable to control century byte handling: 663 * 1: always update 664 * -1: never touch 665 * 0: try to figure out itself 666 */ 667 int rtc_update_century = 0; 668 669 /* 670 * Expand a two-digit year as read from the clock chip 671 * into full width. 672 * Being here, deal with the CMOS century byte. 673 */ 674 static int centb = NVRAM_CENTURY; 675 static int 676 clock_expandyear(int clockyear) 677 { 678 int s, clockcentury, cmoscentury; 679 680 clockcentury = (clockyear < 70) ? 20 : 19; 681 clockyear += 100 * clockcentury; 682 683 if (rtc_update_century < 0) 684 return (clockyear); 685 686 s = splclock(); 687 if (cmoscheck()) 688 cmoscentury = mc146818_read(NULL, NVRAM_CENTURY); 689 #if NMCA > 0 690 else if (MCA_system && cmoscheckps2()) 691 cmoscentury = mc146818_read(NULL, (centb = 0x37)); 692 #endif 693 else 694 cmoscentury = 0; 695 splx(s); 696 if (!cmoscentury) { 697 #ifdef DIAGNOSTIC 698 printf("clock: unknown CMOS layout\n"); 699 #endif 700 return (clockyear); 701 } 702 cmoscentury = bcdtobin(cmoscentury); 703 704 if (cmoscentury != clockcentury) { 705 /* XXX note: saying "century is 20" might confuse the naive. */ 706 printf("WARNING: NVRAM century is %d but RTC year is %d\n", 707 cmoscentury, clockyear); 708 709 /* Kludge to roll over century. */ 710 if ((rtc_update_century > 0) || 711 ((cmoscentury == 19) && (clockcentury == 20) && 712 (clockyear == 2000))) { 713 printf("WARNING: Setting NVRAM century to %d\n", 714 clockcentury); 715 s = splclock(); 716 mc146818_write(NULL, centb, bintobcd(clockcentury)); 717 splx(s); 718 } 719 } else if (cmoscentury == 19 && rtc_update_century == 0) 720 rtc_update_century = 1; /* will update later in resettodr() */ 721 722 return (clockyear); 723 } 724 725 static int 726 rtc_get_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 727 { 728 int s; 729 mc_todregs rtclk; 730 731 s = splclock(); 732 if (rtcget(&rtclk)) { 733 splx(s); 734 return -1; 735 } 736 splx(s); 737 738 dt->dt_sec = bcdtobin(rtclk[MC_SEC]); 739 dt->dt_min = bcdtobin(rtclk[MC_MIN]); 740 dt->dt_hour = bcdtobin(rtclk[MC_HOUR]); 741 dt->dt_day = bcdtobin(rtclk[MC_DOM]); 742 dt->dt_mon = bcdtobin(rtclk[MC_MONTH]); 743 dt->dt_year = clock_expandyear(bcdtobin(rtclk[MC_YEAR])); 744 745 return 0; 746 } 747 748 static int 749 rtc_set_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 750 { 751 mc_todregs rtclk; 752 int century; 753 int s; 754 755 s = splclock(); 756 if (rtcget(&rtclk)) 757 memset(&rtclk, 0, sizeof(rtclk)); 758 splx(s); 759 760 rtclk[MC_SEC] = bintobcd(dt->dt_sec); 761 rtclk[MC_MIN] = bintobcd(dt->dt_min); 762 rtclk[MC_HOUR] = bintobcd(dt->dt_hour); 763 rtclk[MC_DOW] = dt->dt_wday + 1; 764 rtclk[MC_YEAR] = bintobcd(dt->dt_year % 100); 765 rtclk[MC_MONTH] = bintobcd(dt->dt_mon); 766 rtclk[MC_DOM] = bintobcd(dt->dt_day); 767 768 #ifdef DEBUG_CLOCK 769 printf("setclock: %x/%x/%x %x:%x:%x\n", rtclk[MC_YEAR], rtclk[MC_MONTH], 770 rtclk[MC_DOM], rtclk[MC_HOUR], rtclk[MC_MIN], rtclk[MC_SEC]); 771 #endif 772 s = splclock(); 773 rtcput(&rtclk); 774 if (rtc_update_century > 0) { 775 century = bintobcd(dt->dt_year / 100); 776 mc146818_write(NULL, centb, century); /* XXX softc */ 777 } 778 splx(s); 779 return 0; 780 781 } 782 783 static void 784 rtc_register(void) 785 { 786 static struct todr_chip_handle tch; 787 tch.todr_gettime_ymdhms = rtc_get_ymdhms; 788 tch.todr_settime_ymdhms = rtc_set_ymdhms; 789 tch.todr_setwen = NULL; 790 791 todr_attach(&tch); 792 } 793 794 void 795 setstatclockrate(int arg) 796 { 797 } 798
Indexes created Wed Sep 24 05:09:52 GMT 2025