clock.c revision 1.30
1 /* $NetBSD: clock.c,v 1.30 2008/05/11 22:18:08 ad 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 1.30 2008/05/11 22:18:08 ad 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, /* private data */ 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 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 u_long psl; 422 423 /* Don't want someone screwing with the counter while we're here. */ 424 psl = x86_read_psl(); 425 x86_disable_intr(); 426 __cpu_simple_lock(&tmr_lock); 427 /* Select timer0 and latch counter value. */ 428 outb(IO_TIMER1 + TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 429 /* insb to make the read atomic */ 430 rdval = inb(IO_TIMER1+TIMER_CNTR0); 431 rdval |= (inb(IO_TIMER1+TIMER_CNTR0) << 8); 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 x86_write_psl(psl); 442 443 return (count); 444 } 445 446 unsigned int 447 gettick(void) 448 { 449 uint16_t rdval; 450 u_long psl; 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 psl = x86_read_psl(); 457 x86_disable_intr(); 458 __cpu_simple_lock(&tmr_lock); 459 /* Select counter 0 and latch it. */ 460 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 461 rdval = inb(IO_TIMER1+TIMER_CNTR0); 462 rdval |= (inb(IO_TIMER1+TIMER_CNTR0) << 8); 463 __cpu_simple_unlock(&tmr_lock); 464 x86_write_psl(psl); 465 466 return rdval; 467 } 468 469 /* 470 * Wait approximately `n' microseconds. 471 * Relies on timer 1 counting down from (TIMER_FREQ / hz) at TIMER_FREQ Hz. 472 * Note: timer had better have been programmed before this is first used! 473 * (Note that we use `rate generator' mode, which counts at 1:1; `square 474 * wave' mode counts at 2:1). 475 * Don't rely on this being particularly accurate. 476 */ 477 void 478 i8254_delay(unsigned int n) 479 { 480 unsigned int cur_tick, initial_tick; 481 int remaining; 482 483 /* allow DELAY() to be used before startrtclock() */ 484 if (!rtclock_init) 485 initrtclock(TIMER_FREQ); 486 487 /* 488 * Read the counter first, so that the rest of the setup overhead is 489 * counted. 490 */ 491 initial_tick = gettick(); 492 493 if (n <= UINT_MAX / TIMER_FREQ) { 494 /* 495 * For unsigned arithmetic, division can be replaced with 496 * multiplication with the inverse and a shift. 497 */ 498 remaining = n * TIMER_FREQ / 1000000; 499 } else { 500 /* This is a very long delay. 501 * Being slow here doesn't matter. 502 */ 503 remaining = (unsigned long long) n * TIMER_FREQ / 1000000; 504 } 505 506 while (remaining > 1) { 507 #ifdef CLOCK_PARANOIA 508 int delta; 509 cur_tick = gettick(); 510 if (cur_tick > initial_tick) 511 delta = rtclock_tval - (cur_tick - initial_tick); 512 else 513 delta = initial_tick - cur_tick; 514 if (delta < 0 || delta >= rtclock_tval / 2) { 515 DPRINTF(("delay: ignore ticks %.4x-%.4x", 516 initial_tick, cur_tick)); 517 if (clock_broken_latch) { 518 DPRINTF((" (%.4x %.4x %.4x %.4x %.4x %.4x)\n", 519 ticks[0], ticks[1], ticks[2], 520 ticks[3], ticks[4], ticks[5])); 521 } else { 522 DPRINTF(("\n")); 523 } 524 } else 525 remaining -= delta; 526 #else 527 cur_tick = gettick(); 528 if (cur_tick > initial_tick) 529 remaining -= rtclock_tval - (cur_tick - initial_tick); 530 else 531 remaining -= initial_tick - cur_tick; 532 #endif 533 initial_tick = cur_tick; 534 } 535 } 536 537 #if (NPCPPI > 0) 538 int 539 sysbeepmatch(device_t parent, cfdata_t match, void *aux) 540 { 541 return (!ppi_attached); 542 } 543 544 void 545 sysbeepattach(device_t parent, device_t self, 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 } 556 557 int 558 sysbeepdetach(device_t self, int flags) 559 { 560 pmf_device_deregister(self); 561 ppi_attached = 0; 562 return 0; 563 } 564 #endif 565 566 void 567 sysbeep(int pitch, int period) 568 { 569 #if (NPCPPI > 0) 570 if (ppi_attached) 571 pcppi_bell(ppicookie, pitch, period, 0); 572 #endif 573 } 574 575 void 576 i8254_initclocks(void) 577 { 578 579 /* 580 * XXX If you're doing strange things with multiple clocks, you might 581 * want to keep track of clock handlers. 582 */ 583 (void)isa_intr_establish(NULL, 0, IST_PULSE, IPL_CLOCK, 584 (int (*)(void *))clockintr, 0); 585 } 586 587 static void 588 rtcinit(void) 589 { 590 static int first_rtcopen_ever = 1; 591 592 if (!first_rtcopen_ever) 593 return; 594 first_rtcopen_ever = 0; 595 596 mc146818_write(NULL, MC_REGA, /* XXX softc */ 597 MC_BASE_32_KHz | MC_RATE_1024_Hz); 598 mc146818_write(NULL, MC_REGB, MC_REGB_24HR); /* XXX softc */ 599 } 600 601 static int 602 rtcget(mc_todregs *regs) 603 { 604 605 rtcinit(); 606 if ((mc146818_read(NULL, MC_REGD) & MC_REGD_VRT) == 0) /* XXX softc */ 607 return (-1); 608 MC146818_GETTOD(NULL, regs); /* XXX softc */ 609 return (0); 610 } 611 612 static void 613 rtcput(mc_todregs *regs) 614 { 615 616 rtcinit(); 617 MC146818_PUTTOD(NULL, regs); /* XXX softc */ 618 } 619 620 /* 621 * check whether the CMOS layout is "standard"-like (ie, not PS/2-like), 622 * to be called at splclock() 623 */ 624 static int 625 cmoscheck(void) 626 { 627 int i; 628 unsigned short cksum = 0; 629 630 for (i = 0x10; i <= 0x2d; i++) 631 cksum += mc146818_read(NULL, i); /* XXX softc */ 632 633 return (cksum == (mc146818_read(NULL, 0x2e) << 8) 634 + mc146818_read(NULL, 0x2f)); 635 } 636 637 #if NMCA > 0 638 /* 639 * Check whether the CMOS layout is PS/2 like, to be called at splclock(). 640 */ 641 static int cmoscheckps2(void); 642 static int 643 cmoscheckps2(void) 644 { 645 #if 0 646 /* Disabled until I find out the CRC checksum algorithm IBM uses */ 647 int i; 648 unsigned short cksum = 0; 649 650 for (i = 0x10; i <= 0x31; i++) 651 cksum += mc146818_read(NULL, i); /* XXX softc */ 652 653 return (cksum == (mc146818_read(NULL, 0x32) << 8) 654 + mc146818_read(NULL, 0x33)); 655 #else 656 /* Check 'incorrect checksum' bit of IBM PS/2 Diagnostic Status Byte */ 657 return ((mc146818_read(NULL, NVRAM_DIAG) & (1<<6)) == 0); 658 #endif 659 } 660 #endif /* NMCA > 0 */ 661 662 /* 663 * patchable to control century byte handling: 664 * 1: always update 665 * -1: never touch 666 * 0: try to figure out itself 667 */ 668 int rtc_update_century = 0; 669 670 /* 671 * Expand a two-digit year as read from the clock chip 672 * into full width. 673 * Being here, deal with the CMOS century byte. 674 */ 675 static int centb = NVRAM_CENTURY; 676 static int 677 clock_expandyear(int clockyear) 678 { 679 int s, clockcentury, cmoscentury; 680 681 clockcentury = (clockyear < 70) ? 20 : 19; 682 clockyear += 100 * clockcentury; 683 684 if (rtc_update_century < 0) 685 return (clockyear); 686 687 s = splclock(); 688 if (cmoscheck()) 689 cmoscentury = mc146818_read(NULL, NVRAM_CENTURY); 690 #if NMCA > 0 691 else if (MCA_system && cmoscheckps2()) 692 cmoscentury = mc146818_read(NULL, (centb = 0x37)); 693 #endif 694 else 695 cmoscentury = 0; 696 splx(s); 697 if (!cmoscentury) { 698 #ifdef DIAGNOSTIC 699 printf("clock: unknown CMOS layout\n"); 700 #endif 701 return (clockyear); 702 } 703 cmoscentury = bcdtobin(cmoscentury); 704 705 if (cmoscentury != clockcentury) { 706 /* XXX note: saying "century is 20" might confuse the naive. */ 707 printf("WARNING: NVRAM century is %d but RTC year is %d\n", 708 cmoscentury, clockyear); 709 710 /* Kludge to roll over century. */ 711 if ((rtc_update_century > 0) || 712 ((cmoscentury == 19) && (clockcentury == 20) && 713 (clockyear == 2000))) { 714 printf("WARNING: Setting NVRAM century to %d\n", 715 clockcentury); 716 s = splclock(); 717 mc146818_write(NULL, centb, bintobcd(clockcentury)); 718 splx(s); 719 } 720 } else if (cmoscentury == 19 && rtc_update_century == 0) 721 rtc_update_century = 1; /* will update later in resettodr() */ 722 723 return (clockyear); 724 } 725 726 static int 727 rtc_get_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 728 { 729 int s; 730 mc_todregs rtclk; 731 732 s = splclock(); 733 if (rtcget(&rtclk)) { 734 splx(s); 735 return -1; 736 } 737 splx(s); 738 739 dt->dt_sec = bcdtobin(rtclk[MC_SEC]); 740 dt->dt_min = bcdtobin(rtclk[MC_MIN]); 741 dt->dt_hour = bcdtobin(rtclk[MC_HOUR]); 742 dt->dt_day = bcdtobin(rtclk[MC_DOM]); 743 dt->dt_mon = bcdtobin(rtclk[MC_MONTH]); 744 dt->dt_year = clock_expandyear(bcdtobin(rtclk[MC_YEAR])); 745 746 return 0; 747 } 748 749 static int 750 rtc_set_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 751 { 752 mc_todregs rtclk; 753 int century; 754 int s; 755 756 s = splclock(); 757 if (rtcget(&rtclk)) 758 memset(&rtclk, 0, sizeof(rtclk)); 759 splx(s); 760 761 rtclk[MC_SEC] = bintobcd(dt->dt_sec); 762 rtclk[MC_MIN] = bintobcd(dt->dt_min); 763 rtclk[MC_HOUR] = bintobcd(dt->dt_hour); 764 rtclk[MC_DOW] = dt->dt_wday + 1; 765 rtclk[MC_YEAR] = bintobcd(dt->dt_year % 100); 766 rtclk[MC_MONTH] = bintobcd(dt->dt_mon); 767 rtclk[MC_DOM] = bintobcd(dt->dt_day); 768 769 #ifdef DEBUG_CLOCK 770 printf("setclock: %x/%x/%x %x:%x:%x\n", rtclk[MC_YEAR], rtclk[MC_MONTH], 771 rtclk[MC_DOM], rtclk[MC_HOUR], rtclk[MC_MIN], rtclk[MC_SEC]); 772 #endif 773 s = splclock(); 774 rtcput(&rtclk); 775 if (rtc_update_century > 0) { 776 century = bintobcd(dt->dt_year / 100); 777 mc146818_write(NULL, centb, century); /* XXX softc */ 778 } 779 splx(s); 780 return 0; 781 782 } 783 784 static void 785 rtc_register(void) 786 { 787 static struct todr_chip_handle tch; 788 tch.todr_gettime_ymdhms = rtc_get_ymdhms; 789 tch.todr_settime_ymdhms = rtc_set_ymdhms; 790 tch.todr_setwen = NULL; 791 792 todr_attach(&tch); 793 } 794 795 void 796 setstatclockrate(int arg) 797 { 798 } 799
Indexes created Fri Sep 26 08:10:20 GMT 2025