Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/acpica/acpi_machdep.c
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1 /*- 2 * Copyright (c) 2001 Mitsuru IWASAKI 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/bus.h> 32 #include <sys/condvar.h> 33 #include <sys/conf.h> 34 #include <sys/fcntl.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/poll.h> 38 #include <sys/sysctl.h> 39 #include <sys/uio.h> 40 #include <vm/vm.h> 41 #include <vm/pmap.h> 42 43 #include <contrib/dev/acpica/acpi.h> 44 #include <contrib/dev/acpica/actables.h> 45 46 #include <dev/acpica/acpivar.h> 47 #include <dev/acpica/acpiio.h> 48 49 /* 50 * APM driver emulation 51 */ 52 53 #include <machine/apm_bios.h> 54 #include <machine/pc/bios.h> 55 56 #include <i386/bios/apm.h> 57 58 SYSCTL_DECL(_debug_acpi); 59 60 uint32_t acpi_resume_beep; 61 TUNABLE_INT("debug.acpi.resume_beep", &acpi_resume_beep); 62 SYSCTL_UINT(_debug_acpi, OID_AUTO, resume_beep, CTLFLAG_RW, &acpi_resume_beep, 63 0, "Beep the PC speaker when resuming"); 64 uint32_t acpi_reset_video; 65 TUNABLE_INT("hw.acpi.reset_video", &acpi_reset_video); 66 67 static int intr_model = ACPI_INTR_PIC; 68 static int apm_active; 69 static struct clonedevs *apm_clones; 70 71 MALLOC_DEFINE(M_APMDEV, "apmdev", "APM device emulation"); 72 73 static d_open_t apmopen; 74 static d_close_t apmclose; 75 static d_write_t apmwrite; 76 static d_ioctl_t apmioctl; 77 static d_poll_t apmpoll; 78 static d_kqfilter_t apmkqfilter; 79 static void apmreadfiltdetach(struct knote *kn); 80 static int apmreadfilt(struct knote *kn, long hint); 81 static struct filterops apm_readfiltops = 82 { 1, NULL, apmreadfiltdetach, apmreadfilt }; 83 84 static struct cdevsw apm_cdevsw = { 85 .d_version = D_VERSION, 86 .d_flags = D_TRACKCLOSE, 87 .d_open = apmopen, 88 .d_close = apmclose, 89 .d_write = apmwrite, 90 .d_ioctl = apmioctl, 91 .d_poll = apmpoll, 92 .d_name = "apm", 93 .d_kqfilter = apmkqfilter 94 }; 95 96 static int 97 acpi_capm_convert_battstate(struct acpi_battinfo *battp) 98 { 99 int state; 100 101 state = APM_UNKNOWN; 102 103 if (battp->state & ACPI_BATT_STAT_DISCHARG) { 104 if (battp->cap >= 50) 105 state = 0; /* high */ 106 else 107 state = 1; /* low */ 108 } 109 if (battp->state & ACPI_BATT_STAT_CRITICAL) 110 state = 2; /* critical */ 111 if (battp->state & ACPI_BATT_STAT_CHARGING) 112 state = 3; /* charging */ 113 114 /* If still unknown, determine it based on the battery capacity. */ 115 if (state == APM_UNKNOWN) { 116 if (battp->cap >= 50) 117 state = 0; /* high */ 118 else 119 state = 1; /* low */ 120 } 121 122 return (state); 123 } 124 125 static int 126 acpi_capm_convert_battflags(struct acpi_battinfo *battp) 127 { 128 int flags; 129 130 flags = 0; 131 132 if (battp->cap >= 50) 133 flags |= APM_BATT_HIGH; 134 else { 135 if (battp->state & ACPI_BATT_STAT_CRITICAL) 136 flags |= APM_BATT_CRITICAL; 137 else 138 flags |= APM_BATT_LOW; 139 } 140 if (battp->state & ACPI_BATT_STAT_CHARGING) 141 flags |= APM_BATT_CHARGING; 142 if (battp->state == ACPI_BATT_STAT_NOT_PRESENT) 143 flags = APM_BATT_NOT_PRESENT; 144 145 return (flags); 146 } 147 148 static int 149 acpi_capm_get_info(apm_info_t aip) 150 { 151 int acline; 152 struct acpi_battinfo batt; 153 154 aip->ai_infoversion = 1; 155 aip->ai_major = 1; 156 aip->ai_minor = 2; 157 aip->ai_status = apm_active; 158 aip->ai_capabilities= 0xff00; /* unknown */ 159 160 if (acpi_acad_get_acline(&acline)) 161 aip->ai_acline = APM_UNKNOWN; /* unknown */ 162 else 163 aip->ai_acline = acline; /* on/off */ 164 165 if (acpi_battery_get_battinfo(NULL, &batt) != 0) { 166 aip->ai_batt_stat = APM_UNKNOWN; 167 aip->ai_batt_life = APM_UNKNOWN; 168 aip->ai_batt_time = -1; /* unknown */ 169 aip->ai_batteries = ~0U; /* unknown */ 170 } else { 171 aip->ai_batt_stat = acpi_capm_convert_battstate(&batt); 172 aip->ai_batt_life = batt.cap; 173 aip->ai_batt_time = (batt.min == -1) ? -1 : batt.min * 60; 174 aip->ai_batteries = acpi_battery_get_units(); 175 } 176 177 return (0); 178 } 179 180 static int 181 acpi_capm_get_pwstatus(apm_pwstatus_t app) 182 { 183 device_t dev; 184 int acline, unit, error; 185 struct acpi_battinfo batt; 186 187 if (app->ap_device != PMDV_ALLDEV && 188 (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL)) 189 return (1); 190 191 if (app->ap_device == PMDV_ALLDEV) 192 error = acpi_battery_get_battinfo(NULL, &batt); 193 else { 194 unit = app->ap_device - PMDV_BATT0; 195 dev = devclass_get_device(devclass_find("battery"), unit); 196 if (dev != NULL) 197 error = acpi_battery_get_battinfo(dev, &batt); 198 else 199 error = ENXIO; 200 } 201 if (error) 202 return (1); 203 204 app->ap_batt_stat = acpi_capm_convert_battstate(&batt); 205 app->ap_batt_flag = acpi_capm_convert_battflags(&batt); 206 app->ap_batt_life = batt.cap; 207 app->ap_batt_time = (batt.min == -1) ? -1 : batt.min * 60; 208 209 if (acpi_acad_get_acline(&acline)) 210 app->ap_acline = APM_UNKNOWN; 211 else 212 app->ap_acline = acline; /* on/off */ 213 214 return (0); 215 } 216 217 /* Create single-use devices for /dev/apm and /dev/apmctl. */ 218 static void 219 apm_clone(void *arg, struct ucred *cred, char *name, int namelen, 220 struct cdev **dev) 221 { 222 int ctl_dev, unit; 223 224 if (*dev != NULL) 225 return; 226 if (strcmp(name, "apmctl") == 0) 227 ctl_dev = TRUE; 228 else if (strcmp(name, "apm") == 0) 229 ctl_dev = FALSE; 230 else 231 return; 232 233 /* Always create a new device and unit number. */ 234 unit = -1; 235 if (clone_create(&apm_clones, &apm_cdevsw, &unit, dev, 0)) { 236 if (ctl_dev) { 237 *dev = make_dev(&apm_cdevsw, unit2minor(unit), 238 UID_ROOT, GID_OPERATOR, 0660, "apmctl%d", unit); 239 } else { 240 *dev = make_dev(&apm_cdevsw, unit2minor(unit), 241 UID_ROOT, GID_OPERATOR, 0664, "apm%d", unit); 242 } 243 if (*dev != NULL) { 244 dev_ref(*dev); 245 (*dev)->si_flags |= SI_CHEAPCLONE; 246 } 247 } 248 } 249 250 /* Create a struct for tracking per-device suspend notification. */ 251 static struct apm_clone_data * 252 apm_create_clone(struct cdev *dev, struct acpi_softc *acpi_sc) 253 { 254 struct apm_clone_data *clone; 255 256 clone = malloc(sizeof(*clone), M_APMDEV, M_WAITOK); 257 clone->cdev = dev; 258 clone->acpi_sc = acpi_sc; 259 clone->notify_status = APM_EV_NONE; 260 bzero(&clone->sel_read, sizeof(clone->sel_read)); 261 knlist_init_mtx(&clone->sel_read.si_note, &acpi_mutex); 262 263 /* 264 * The acpi device is always managed by devd(8) and is considered 265 * writable (i.e., ack is required to allow suspend to proceed.) 266 */ 267 if (strcmp("acpi", devtoname(dev)) == 0) 268 clone->flags = ACPI_EVF_DEVD | ACPI_EVF_WRITE; 269 else 270 clone->flags = ACPI_EVF_NONE; 271 272 ACPI_LOCK(acpi); 273 STAILQ_INSERT_TAIL(&acpi_sc->apm_cdevs, clone, entries); 274 ACPI_UNLOCK(acpi); 275 return (clone); 276 } 277 278 static int 279 apmopen(struct cdev *dev, int flag, int fmt, d_thread_t *td) 280 { 281 struct acpi_softc *acpi_sc; 282 struct apm_clone_data *clone; 283 284 acpi_sc = devclass_get_softc(devclass_find("acpi"), 0); 285 clone = apm_create_clone(dev, acpi_sc); 286 dev->si_drv1 = clone; 287 288 /* If the device is opened for write, record that. */ 289 if ((flag & FWRITE) != 0) 290 clone->flags |= ACPI_EVF_WRITE; 291 292 return (0); 293 } 294 295 static int 296 apmclose(struct cdev *dev, int flag, int fmt, d_thread_t *td) 297 { 298 struct apm_clone_data *clone; 299 struct acpi_softc *acpi_sc; 300 301 clone = dev->si_drv1; 302 acpi_sc = clone->acpi_sc; 303 304 /* We are about to lose a reference so check if suspend should occur */ 305 if (acpi_sc->acpi_next_sstate != 0 && 306 clone->notify_status != APM_EV_ACKED) 307 acpi_AckSleepState(clone, 0); 308 309 /* Remove this clone's data from the list and free it. */ 310 ACPI_LOCK(acpi); 311 STAILQ_REMOVE(&acpi_sc->apm_cdevs, clone, apm_clone_data, entries); 312 knlist_destroy(&clone->sel_read.si_note); 313 ACPI_UNLOCK(acpi); 314 free(clone, M_APMDEV); 315 destroy_dev_sched(dev); 316 return (0); 317 } 318 319 static int 320 apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, d_thread_t *td) 321 { 322 int error; 323 struct apm_clone_data *clone; 324 struct acpi_softc *acpi_sc; 325 struct apm_info info; 326 struct apm_event_info *ev_info; 327 apm_info_old_t aiop; 328 329 error = 0; 330 clone = dev->si_drv1; 331 acpi_sc = clone->acpi_sc; 332 333 switch (cmd) { 334 case APMIO_SUSPEND: 335 if ((flag & FWRITE) == 0) 336 return (EPERM); 337 if (acpi_sc->acpi_next_sstate == 0) { 338 if (acpi_sc->acpi_suspend_sx != ACPI_STATE_S5) { 339 error = acpi_ReqSleepState(acpi_sc, 340 acpi_sc->acpi_suspend_sx); 341 } else { 342 printf( 343 "power off via apm suspend not supported\n"); 344 error = ENXIO; 345 } 346 } else 347 error = acpi_AckSleepState(clone, 0); 348 break; 349 case APMIO_STANDBY: 350 if ((flag & FWRITE) == 0) 351 return (EPERM); 352 if (acpi_sc->acpi_next_sstate == 0) { 353 if (acpi_sc->acpi_standby_sx != ACPI_STATE_S5) { 354 error = acpi_ReqSleepState(acpi_sc, 355 acpi_sc->acpi_standby_sx); 356 } else { 357 printf( 358 "power off via apm standby not supported\n"); 359 error = ENXIO; 360 } 361 } else 362 error = acpi_AckSleepState(clone, 0); 363 break; 364 case APMIO_NEXTEVENT: 365 printf("apm nextevent start\n"); 366 ACPI_LOCK(acpi); 367 if (acpi_sc->acpi_next_sstate != 0 && clone->notify_status == 368 APM_EV_NONE) { 369 ev_info = (struct apm_event_info *)addr; 370 if (acpi_sc->acpi_next_sstate <= ACPI_STATE_S3) 371 ev_info->type = PMEV_STANDBYREQ; 372 else 373 ev_info->type = PMEV_SUSPENDREQ; 374 ev_info->index = 0; 375 clone->notify_status = APM_EV_NOTIFIED; 376 printf("apm event returning %d\n", ev_info->type); 377 } else 378 error = EAGAIN; 379 ACPI_UNLOCK(acpi); 380 break; 381 case APMIO_GETINFO_OLD: 382 if (acpi_capm_get_info(&info)) 383 error = ENXIO; 384 aiop = (apm_info_old_t)addr; 385 aiop->ai_major = info.ai_major; 386 aiop->ai_minor = info.ai_minor; 387 aiop->ai_acline = info.ai_acline; 388 aiop->ai_batt_stat = info.ai_batt_stat; 389 aiop->ai_batt_life = info.ai_batt_life; 390 aiop->ai_status = info.ai_status; 391 break; 392 case APMIO_GETINFO: 393 if (acpi_capm_get_info((apm_info_t)addr)) 394 error = ENXIO; 395 break; 396 case APMIO_GETPWSTATUS: 397 if (acpi_capm_get_pwstatus((apm_pwstatus_t)addr)) 398 error = ENXIO; 399 break; 400 case APMIO_ENABLE: 401 if ((flag & FWRITE) == 0) 402 return (EPERM); 403 apm_active = 1; 404 break; 405 case APMIO_DISABLE: 406 if ((flag & FWRITE) == 0) 407 return (EPERM); 408 apm_active = 0; 409 break; 410 case APMIO_HALTCPU: 411 break; 412 case APMIO_NOTHALTCPU: 413 break; 414 case APMIO_DISPLAY: 415 if ((flag & FWRITE) == 0) 416 return (EPERM); 417 break; 418 case APMIO_BIOS: 419 if ((flag & FWRITE) == 0) 420 return (EPERM); 421 bzero(addr, sizeof(struct apm_bios_arg)); 422 break; 423 default: 424 error = EINVAL; 425 break; 426 } 427 428 return (error); 429 } 430 431 static int 432 apmwrite(struct cdev *dev, struct uio *uio, int ioflag) 433 { 434 return (uio->uio_resid); 435 } 436 437 static int 438 apmpoll(struct cdev *dev, int events, d_thread_t *td) 439 { 440 struct apm_clone_data *clone; 441 int revents; 442 443 revents = 0; 444 ACPI_LOCK(acpi); 445 clone = dev->si_drv1; 446 if (clone->acpi_sc->acpi_next_sstate) 447 revents |= events & (POLLIN | POLLRDNORM); 448 else 449 selrecord(td, &clone->sel_read); 450 ACPI_UNLOCK(acpi); 451 return (revents); 452 } 453 454 static int 455 apmkqfilter(struct cdev *dev, struct knote *kn) 456 { 457 struct apm_clone_data *clone; 458 459 ACPI_LOCK(acpi); 460 clone = dev->si_drv1; 461 kn->kn_hook = clone; 462 kn->kn_fop = &apm_readfiltops; 463 knlist_add(&clone->sel_read.si_note, kn, 0); 464 ACPI_UNLOCK(acpi); 465 return (0); 466 } 467 468 static void 469 apmreadfiltdetach(struct knote *kn) 470 { 471 struct apm_clone_data *clone; 472 473 ACPI_LOCK(acpi); 474 clone = kn->kn_hook; 475 knlist_remove(&clone->sel_read.si_note, kn, 0); 476 ACPI_UNLOCK(acpi); 477 } 478 479 static int 480 apmreadfilt(struct knote *kn, long hint) 481 { 482 struct apm_clone_data *clone; 483 int sleeping; 484 485 ACPI_LOCK(acpi); 486 clone = kn->kn_hook; 487 sleeping = clone->acpi_sc->acpi_next_sstate ? 1 : 0; 488 ACPI_UNLOCK(acpi); 489 return (sleeping); 490 } 491 492 int 493 acpi_machdep_init(device_t dev) 494 { 495 struct acpi_softc *acpi_sc; 496 497 acpi_sc = devclass_get_softc(devclass_find("acpi"), 0); 498 499 /* Create a clone for /dev/acpi also. */ 500 STAILQ_INIT(&acpi_sc->apm_cdevs); 501 acpi_sc->acpi_clone = apm_create_clone(acpi_sc->acpi_dev_t, acpi_sc); 502 clone_setup(&apm_clones); 503 EVENTHANDLER_REGISTER(dev_clone, apm_clone, 0, 1000); 504 acpi_install_wakeup_handler(acpi_sc); 505 506 if (intr_model == ACPI_INTR_PIC) 507 BUS_CONFIG_INTR(dev, AcpiGbl_FADT.SciInterrupt, 508 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); 509 else 510 acpi_SetIntrModel(intr_model); 511 512 SYSCTL_ADD_UINT(&acpi_sc->acpi_sysctl_ctx, 513 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO, 514 "reset_video", CTLFLAG_RW, &acpi_reset_video, 0, 515 "Call the VESA reset BIOS vector on the resume path"); 516 517 return (0); 518 } 519 520 void 521 acpi_SetDefaultIntrModel(int model) 522 { 523 524 intr_model = model; 525 } 526 527 /* Check BIOS date. If 1998 or older, disable ACPI. */ 528 int 529 acpi_machdep_quirks(int *quirks) 530 { 531 char *va; 532 int year; 533 534 /* BIOS address 0xffff5 contains the date in the format mm/dd/yy. */ 535 va = pmap_mapbios(0xffff0, 16); 536 sscanf(va + 11, "%2d", &year); 537 pmap_unmapbios((vm_offset_t)va, 16); 538 539 /* 540 * Date must be >= 1/1/1999 or we don't trust ACPI. Note that this 541 * check must be changed by my 114th birthday. 542 */ 543 if (year > 90 && year < 99) 544 *quirks = ACPI_Q_BROKEN; 545 546 return (0); 547 } 548 549 void 550 acpi_cpu_c1() 551 { 552 __asm __volatile("sti; hlt"); 553 } 554 555 /* 556 * Support for mapping ACPI tables during early boot. This abuses the 557 * crashdump map because the kernel cannot allocate KVA in 558 * pmap_mapbios() when this is used. This makes the following 559 * assumptions about how we use this KVA: pages 0 and 1 are used to 560 * map in the header of each table found via the RSDT or XSDT and 561 * pages 2 to n are used to map in the RSDT or XSDT. This has to use 562 * 2 pages for the table headers in case a header spans a page 563 * boundary. 564 * 565 * XXX: We don't ensure the table fits in the available address space 566 * in the crashdump map. 567 */ 568 569 /* 570 * Map some memory using the crashdump map. 'offset' is an offset in 571 * pages into the crashdump map to use for the start of the mapping. 572 */ 573 static void * 574 table_map(vm_paddr_t pa, int offset, vm_offset_t length) 575 { 576 vm_offset_t va, off; 577 void *data; 578 579 off = pa & PAGE_MASK; 580 length = roundup(length + off, PAGE_SIZE); 581 pa = pa & PG_FRAME; 582 va = (vm_offset_t)pmap_kenter_temporary(pa, offset) + 583 (offset * PAGE_SIZE); 584 data = (void *)(va + off); 585 length -= PAGE_SIZE; 586 while (length > 0) { 587 va += PAGE_SIZE; 588 pa += PAGE_SIZE; 589 length -= PAGE_SIZE; 590 pmap_kenter(va, pa); 591 invlpg(va); 592 } 593 return (data); 594 } 595 596 /* Unmap memory previously mapped with table_map(). */ 597 static void 598 table_unmap(void *data, vm_offset_t length) 599 { 600 vm_offset_t va, off; 601 602 va = (vm_offset_t)data; 603 off = va & PAGE_MASK; 604 length = roundup(length + off, PAGE_SIZE); 605 va &= ~PAGE_MASK; 606 while (length > 0) { 607 pmap_kremove(va); 608 invlpg(va); 609 va += PAGE_SIZE; 610 length -= PAGE_SIZE; 611 } 612 } 613 614 /* 615 * Map a table at a given offset into the crashdump map. It first 616 * maps the header to determine the table length and then maps the 617 * entire table. 618 */ 619 static void * 620 map_table(vm_paddr_t pa, int offset, const char *sig) 621 { 622 ACPI_TABLE_HEADER *header; 623 vm_offset_t length; 624 void *table; 625 626 header = table_map(pa, offset, sizeof(ACPI_TABLE_HEADER)); 627 if (strncmp(header->Signature, sig, ACPI_NAME_SIZE) != 0) { 628 table_unmap(header, sizeof(ACPI_TABLE_HEADER)); 629 return (NULL); 630 } 631 length = header->Length; 632 table_unmap(header, sizeof(ACPI_TABLE_HEADER)); 633 table = table_map(pa, offset, length); 634 if (ACPI_FAILURE(AcpiTbChecksum(table, length))) { 635 if (bootverbose) 636 printf("ACPI: Failed checksum for table %s\n", sig); 637 #if (ACPI_CHECKSUM_ABORT) 638 table_unmap(table, length); 639 return (NULL); 640 #endif 641 } 642 return (table); 643 } 644 645 /* 646 * See if a given ACPI table is the requested table. Returns the 647 * length of the able if it matches or zero on failure. 648 */ 649 static int 650 probe_table(vm_paddr_t address, const char *sig) 651 { 652 ACPI_TABLE_HEADER *table; 653 654 table = table_map(address, 0, sizeof(ACPI_TABLE_HEADER)); 655 if (table == NULL) { 656 if (bootverbose) 657 printf("ACPI: Failed to map table at 0x%jx\n", 658 (uintmax_t)address); 659 return (0); 660 } 661 if (bootverbose) 662 printf("Table '%.4s' at 0x%jx\n", table->Signature, 663 (uintmax_t)address); 664 665 if (strncmp(table->Signature, sig, ACPI_NAME_SIZE) != 0) { 666 table_unmap(table, sizeof(ACPI_TABLE_HEADER)); 667 return (0); 668 } 669 table_unmap(table, sizeof(ACPI_TABLE_HEADER)); 670 return (1); 671 } 672 673 /* 674 * Try to map a table at a given physical address previously returned 675 * by acpi_find_table(). 676 */ 677 void * 678 acpi_map_table(vm_paddr_t pa, const char *sig) 679 { 680 681 return (map_table(pa, 0, sig)); 682 } 683 684 /* Unmap a table previously mapped via acpi_map_table(). */ 685 void 686 acpi_unmap_table(void *table) 687 { 688 ACPI_TABLE_HEADER *header; 689 690 header = (ACPI_TABLE_HEADER *)table; 691 table_unmap(table, header->Length); 692 } 693 694 /* 695 * Return the physical address of the requested table or zero if one 696 * is not found. 697 */ 698 vm_paddr_t 699 acpi_find_table(const char *sig) 700 { 701 ACPI_PHYSICAL_ADDRESS rsdp_ptr; 702 ACPI_TABLE_RSDP *rsdp; 703 ACPI_TABLE_RSDT *rsdt; 704 ACPI_TABLE_XSDT *xsdt; 705 ACPI_TABLE_HEADER *table; 706 vm_paddr_t addr; 707 int i, count; 708 709 if (resource_disabled("acpi", 0)) 710 return (0); 711 712 /* 713 * Map in the RSDP. Since ACPI uses AcpiOsMapMemory() which in turn 714 * calls pmap_mapbios() to find the RSDP, we assume that we can use 715 * pmap_mapbios() to map the RSDP. 716 */ 717 if ((rsdp_ptr = AcpiOsGetRootPointer()) == 0) 718 return (0); 719 rsdp = pmap_mapbios(rsdp_ptr, sizeof(ACPI_TABLE_RSDP)); 720 if (rsdp == NULL) { 721 if (bootverbose) 722 printf("ACPI: Failed to map RSDP\n"); 723 return (0); 724 } 725 726 /* 727 * For ACPI >= 2.0, use the XSDT if it is available. 728 * Otherwise, use the RSDT. We map the XSDT or RSDT at page 2 729 * in the crashdump area. Pages 0 and 1 are used to map in the 730 * headers of candidate ACPI tables. 731 */ 732 addr = 0; 733 if (rsdp->Revision >= 2 && rsdp->XsdtPhysicalAddress != 0) { 734 /* 735 * AcpiOsGetRootPointer only verifies the checksum for 736 * the version 1.0 portion of the RSDP. Version 2.0 has 737 * an additional checksum that we verify first. 738 */ 739 if (AcpiTbChecksum((UINT8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)) { 740 if (bootverbose) 741 printf("ACPI: RSDP failed extended checksum\n"); 742 return (0); 743 } 744 xsdt = map_table(rsdp->XsdtPhysicalAddress, 2, ACPI_SIG_XSDT); 745 if (xsdt == NULL) { 746 if (bootverbose) 747 printf("ACPI: Failed to map XSDT\n"); 748 return (0); 749 } 750 count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) / 751 sizeof(UINT64); 752 for (i = 0; i < count; i++) 753 if (probe_table(xsdt->TableOffsetEntry[i], sig)) { 754 addr = xsdt->TableOffsetEntry[i]; 755 break; 756 } 757 acpi_unmap_table(xsdt); 758 } else { 759 rsdt = map_table(rsdp->RsdtPhysicalAddress, 2, ACPI_SIG_RSDT); 760 if (rsdt == NULL) { 761 if (bootverbose) 762 printf("ACPI: Failed to map RSDT\n"); 763 return (0); 764 } 765 count = (rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) / 766 sizeof(UINT32); 767 for (i = 0; i < count; i++) 768 if (probe_table(rsdt->TableOffsetEntry[i], sig)) { 769 addr = rsdt->TableOffsetEntry[i]; 770 break; 771 } 772 acpi_unmap_table(rsdt); 773 } 774 pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP)); 775 if (addr == 0) { 776 if (bootverbose) 777 printf("ACPI: No %s table found\n", sig); 778 return (0); 779 } 780 if (bootverbose) 781 printf("%s: Found table at 0x%jx\n", sig, (uintmax_t)addr); 782 783 /* 784 * Verify that we can map the full table and that its checksum is 785 * correct, etc. 786 */ 787 table = map_table(addr, 0, sig); 788 if (table == NULL) 789 return (0); 790 acpi_unmap_table(table); 791 792 return (addr); 793 }
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