Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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/module.h> 38 #include <sys/poll.h> 39 #include <sys/sysctl.h> 40 #include <sys/uio.h> 41 #include <vm/vm.h> 42 #include <vm/pmap.h> 43 44 #include <contrib/dev/acpica/include/acpi.h> 45 #include <contrib/dev/acpica/include/accommon.h> 46 #include <contrib/dev/acpica/include/actables.h> 47 48 #include <dev/acpica/acpivar.h> 49 #include <dev/acpica/acpiio.h> 50 51 #include <machine/nexusvar.h> 52 53 /* 54 * APM driver emulation 55 */ 56 57 #include <machine/apm_bios.h> 58 #include <machine/pc/bios.h> 59 60 #include <i386/bios/apm.h> 61 62 uint32_t acpi_resume_beep; 63 TUNABLE_INT("debug.acpi.resume_beep", &acpi_resume_beep); 64 SYSCTL_UINT(_debug_acpi, OID_AUTO, resume_beep, CTLFLAG_RW, &acpi_resume_beep, 65 0, "Beep the PC speaker when resuming"); 66 uint32_t acpi_reset_video; 67 TUNABLE_INT("hw.acpi.reset_video", &acpi_reset_video); 68 69 static int intr_model = ACPI_INTR_PIC; 70 static int apm_active; 71 static struct clonedevs *apm_clones; 72 73 MALLOC_DEFINE(M_APMDEV, "apmdev", "APM device emulation"); 74 75 static d_open_t apmopen; 76 static d_close_t apmclose; 77 static d_write_t apmwrite; 78 static d_ioctl_t apmioctl; 79 static d_poll_t apmpoll; 80 static d_kqfilter_t apmkqfilter; 81 static void apmreadfiltdetach(struct knote *kn); 82 static int apmreadfilt(struct knote *kn, long hint); 83 static struct filterops apm_readfiltops = 84 { 1, NULL, apmreadfiltdetach, apmreadfilt }; 85 86 static struct cdevsw apm_cdevsw = { 87 .d_version = D_VERSION, 88 .d_flags = D_TRACKCLOSE | D_NEEDMINOR, 89 .d_open = apmopen, 90 .d_close = apmclose, 91 .d_write = apmwrite, 92 .d_ioctl = apmioctl, 93 .d_poll = apmpoll, 94 .d_name = "apm", 95 .d_kqfilter = apmkqfilter 96 }; 97 98 static int 99 acpi_capm_convert_battstate(struct acpi_battinfo *battp) 100 { 101 int state; 102 103 state = APM_UNKNOWN; 104 105 if (battp->state & ACPI_BATT_STAT_DISCHARG) { 106 if (battp->cap >= 50) 107 state = 0; /* high */ 108 else 109 state = 1; /* low */ 110 } 111 if (battp->state & ACPI_BATT_STAT_CRITICAL) 112 state = 2; /* critical */ 113 if (battp->state & ACPI_BATT_STAT_CHARGING) 114 state = 3; /* charging */ 115 116 /* If still unknown, determine it based on the battery capacity. */ 117 if (state == APM_UNKNOWN) { 118 if (battp->cap >= 50) 119 state = 0; /* high */ 120 else 121 state = 1; /* low */ 122 } 123 124 return (state); 125 } 126 127 static int 128 acpi_capm_convert_battflags(struct acpi_battinfo *battp) 129 { 130 int flags; 131 132 flags = 0; 133 134 if (battp->cap >= 50) 135 flags |= APM_BATT_HIGH; 136 else { 137 if (battp->state & ACPI_BATT_STAT_CRITICAL) 138 flags |= APM_BATT_CRITICAL; 139 else 140 flags |= APM_BATT_LOW; 141 } 142 if (battp->state & ACPI_BATT_STAT_CHARGING) 143 flags |= APM_BATT_CHARGING; 144 if (battp->state == ACPI_BATT_STAT_NOT_PRESENT) 145 flags = APM_BATT_NOT_PRESENT; 146 147 return (flags); 148 } 149 150 static int 151 acpi_capm_get_info(apm_info_t aip) 152 { 153 int acline; 154 struct acpi_battinfo batt; 155 156 aip->ai_infoversion = 1; 157 aip->ai_major = 1; 158 aip->ai_minor = 2; 159 aip->ai_status = apm_active; 160 aip->ai_capabilities= 0xff00; /* unknown */ 161 162 if (acpi_acad_get_acline(&acline)) 163 aip->ai_acline = APM_UNKNOWN; /* unknown */ 164 else 165 aip->ai_acline = acline; /* on/off */ 166 167 if (acpi_battery_get_battinfo(NULL, &batt) != 0) { 168 aip->ai_batt_stat = APM_UNKNOWN; 169 aip->ai_batt_life = APM_UNKNOWN; 170 aip->ai_batt_time = -1; /* unknown */ 171 aip->ai_batteries = ~0U; /* unknown */ 172 } else { 173 aip->ai_batt_stat = acpi_capm_convert_battstate(&batt); 174 aip->ai_batt_life = batt.cap; 175 aip->ai_batt_time = (batt.min == -1) ? -1 : batt.min * 60; 176 aip->ai_batteries = acpi_battery_get_units(); 177 } 178 179 return (0); 180 } 181 182 static int 183 acpi_capm_get_pwstatus(apm_pwstatus_t app) 184 { 185 device_t dev; 186 int acline, unit, error; 187 struct acpi_battinfo batt; 188 189 if (app->ap_device != PMDV_ALLDEV && 190 (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL)) 191 return (1); 192 193 if (app->ap_device == PMDV_ALLDEV) 194 error = acpi_battery_get_battinfo(NULL, &batt); 195 else { 196 unit = app->ap_device - PMDV_BATT0; 197 dev = devclass_get_device(devclass_find("battery"), unit); 198 if (dev != NULL) 199 error = acpi_battery_get_battinfo(dev, &batt); 200 else 201 error = ENXIO; 202 } 203 if (error) 204 return (1); 205 206 app->ap_batt_stat = acpi_capm_convert_battstate(&batt); 207 app->ap_batt_flag = acpi_capm_convert_battflags(&batt); 208 app->ap_batt_life = batt.cap; 209 app->ap_batt_time = (batt.min == -1) ? -1 : batt.min * 60; 210 211 if (acpi_acad_get_acline(&acline)) 212 app->ap_acline = APM_UNKNOWN; 213 else 214 app->ap_acline = acline; /* on/off */ 215 216 return (0); 217 } 218 219 /* Create single-use devices for /dev/apm and /dev/apmctl. */ 220 static void 221 apm_clone(void *arg, struct ucred *cred, char *name, int namelen, 222 struct cdev **dev) 223 { 224 int ctl_dev, unit; 225 226 if (*dev != NULL) 227 return; 228 if (strcmp(name, "apmctl") == 0) 229 ctl_dev = TRUE; 230 else if (strcmp(name, "apm") == 0) 231 ctl_dev = FALSE; 232 else 233 return; 234 235 /* Always create a new device and unit number. */ 236 unit = -1; 237 if (clone_create(&apm_clones, &apm_cdevsw, &unit, dev, 0)) { 238 if (ctl_dev) { 239 *dev = make_dev(&apm_cdevsw, unit, 240 UID_ROOT, GID_OPERATOR, 0660, "apmctl%d", unit); 241 } else { 242 *dev = make_dev(&apm_cdevsw, unit, 243 UID_ROOT, GID_OPERATOR, 0664, "apm%d", unit); 244 } 245 if (*dev != NULL) { 246 dev_ref(*dev); 247 (*dev)->si_flags |= SI_CHEAPCLONE; 248 } 249 } 250 } 251 252 /* Create a struct for tracking per-device suspend notification. */ 253 static struct apm_clone_data * 254 apm_create_clone(struct cdev *dev, struct acpi_softc *acpi_sc) 255 { 256 struct apm_clone_data *clone; 257 258 clone = malloc(sizeof(*clone), M_APMDEV, M_WAITOK); 259 clone->cdev = dev; 260 clone->acpi_sc = acpi_sc; 261 clone->notify_status = APM_EV_NONE; 262 bzero(&clone->sel_read, sizeof(clone->sel_read)); 263 knlist_init_mtx(&clone->sel_read.si_note, &acpi_mutex); 264 265 /* 266 * The acpi device is always managed by devd(8) and is considered 267 * writable (i.e., ack is required to allow suspend to proceed.) 268 */ 269 if (strcmp("acpi", devtoname(dev)) == 0) 270 clone->flags = ACPI_EVF_DEVD | ACPI_EVF_WRITE; 271 else 272 clone->flags = ACPI_EVF_NONE; 273 274 ACPI_LOCK(acpi); 275 STAILQ_INSERT_TAIL(&acpi_sc->apm_cdevs, clone, entries); 276 ACPI_UNLOCK(acpi); 277 return (clone); 278 } 279 280 static int 281 apmopen(struct cdev *dev, int flag, int fmt, struct thread *td) 282 { 283 struct acpi_softc *acpi_sc; 284 struct apm_clone_data *clone; 285 286 acpi_sc = devclass_get_softc(devclass_find("acpi"), 0); 287 clone = apm_create_clone(dev, acpi_sc); 288 dev->si_drv1 = clone; 289 290 /* If the device is opened for write, record that. */ 291 if ((flag & FWRITE) != 0) 292 clone->flags |= ACPI_EVF_WRITE; 293 294 return (0); 295 } 296 297 static int 298 apmclose(struct cdev *dev, int flag, int fmt, struct thread *td) 299 { 300 struct apm_clone_data *clone; 301 struct acpi_softc *acpi_sc; 302 303 clone = dev->si_drv1; 304 acpi_sc = clone->acpi_sc; 305 306 /* We are about to lose a reference so check if suspend should occur */ 307 if (acpi_sc->acpi_next_sstate != 0 && 308 clone->notify_status != APM_EV_ACKED) 309 acpi_AckSleepState(clone, 0); 310 311 /* Remove this clone's data from the list and free it. */ 312 ACPI_LOCK(acpi); 313 STAILQ_REMOVE(&acpi_sc->apm_cdevs, clone, apm_clone_data, entries); 314 seldrain(&clone->sel_read); 315 knlist_destroy(&clone->sel_read.si_note); 316 ACPI_UNLOCK(acpi); 317 free(clone, M_APMDEV); 318 destroy_dev_sched(dev); 319 return (0); 320 } 321 322 static int 323 apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td) 324 { 325 int error; 326 struct apm_clone_data *clone; 327 struct acpi_softc *acpi_sc; 328 struct apm_info info; 329 struct apm_event_info *ev_info; 330 apm_info_old_t aiop; 331 332 error = 0; 333 clone = dev->si_drv1; 334 acpi_sc = clone->acpi_sc; 335 336 switch (cmd) { 337 case APMIO_SUSPEND: 338 if ((flag & FWRITE) == 0) 339 return (EPERM); 340 if (acpi_sc->acpi_next_sstate == 0) { 341 if (acpi_sc->acpi_suspend_sx != ACPI_STATE_S5) { 342 error = acpi_ReqSleepState(acpi_sc, 343 acpi_sc->acpi_suspend_sx); 344 } else { 345 printf( 346 "power off via apm suspend not supported\n"); 347 error = ENXIO; 348 } 349 } else 350 error = acpi_AckSleepState(clone, 0); 351 break; 352 case APMIO_STANDBY: 353 if ((flag & FWRITE) == 0) 354 return (EPERM); 355 if (acpi_sc->acpi_next_sstate == 0) { 356 if (acpi_sc->acpi_standby_sx != ACPI_STATE_S5) { 357 error = acpi_ReqSleepState(acpi_sc, 358 acpi_sc->acpi_standby_sx); 359 } else { 360 printf( 361 "power off via apm standby not supported\n"); 362 error = ENXIO; 363 } 364 } else 365 error = acpi_AckSleepState(clone, 0); 366 break; 367 case APMIO_NEXTEVENT: 368 printf("apm nextevent start\n"); 369 ACPI_LOCK(acpi); 370 if (acpi_sc->acpi_next_sstate != 0 && clone->notify_status == 371 APM_EV_NONE) { 372 ev_info = (struct apm_event_info *)addr; 373 if (acpi_sc->acpi_next_sstate <= ACPI_STATE_S3) 374 ev_info->type = PMEV_STANDBYREQ; 375 else 376 ev_info->type = PMEV_SUSPENDREQ; 377 ev_info->index = 0; 378 clone->notify_status = APM_EV_NOTIFIED; 379 printf("apm event returning %d\n", ev_info->type); 380 } else 381 error = EAGAIN; 382 ACPI_UNLOCK(acpi); 383 break; 384 case APMIO_GETINFO_OLD: 385 if (acpi_capm_get_info(&info)) 386 error = ENXIO; 387 aiop = (apm_info_old_t)addr; 388 aiop->ai_major = info.ai_major; 389 aiop->ai_minor = info.ai_minor; 390 aiop->ai_acline = info.ai_acline; 391 aiop->ai_batt_stat = info.ai_batt_stat; 392 aiop->ai_batt_life = info.ai_batt_life; 393 aiop->ai_status = info.ai_status; 394 break; 395 case APMIO_GETINFO: 396 if (acpi_capm_get_info((apm_info_t)addr)) 397 error = ENXIO; 398 break; 399 case APMIO_GETPWSTATUS: 400 if (acpi_capm_get_pwstatus((apm_pwstatus_t)addr)) 401 error = ENXIO; 402 break; 403 case APMIO_ENABLE: 404 if ((flag & FWRITE) == 0) 405 return (EPERM); 406 apm_active = 1; 407 break; 408 case APMIO_DISABLE: 409 if ((flag & FWRITE) == 0) 410 return (EPERM); 411 apm_active = 0; 412 break; 413 case APMIO_HALTCPU: 414 break; 415 case APMIO_NOTHALTCPU: 416 break; 417 case APMIO_DISPLAY: 418 if ((flag & FWRITE) == 0) 419 return (EPERM); 420 break; 421 case APMIO_BIOS: 422 if ((flag & FWRITE) == 0) 423 return (EPERM); 424 bzero(addr, sizeof(struct apm_bios_arg)); 425 break; 426 default: 427 error = EINVAL; 428 break; 429 } 430 431 return (error); 432 } 433 434 static int 435 apmwrite(struct cdev *dev, struct uio *uio, int ioflag) 436 { 437 return (uio->uio_resid); 438 } 439 440 static int 441 apmpoll(struct cdev *dev, int events, struct thread *td) 442 { 443 struct apm_clone_data *clone; 444 int revents; 445 446 revents = 0; 447 ACPI_LOCK(acpi); 448 clone = dev->si_drv1; 449 if (clone->acpi_sc->acpi_next_sstate) 450 revents |= events & (POLLIN | POLLRDNORM); 451 else 452 selrecord(td, &clone->sel_read); 453 ACPI_UNLOCK(acpi); 454 return (revents); 455 } 456 457 static int 458 apmkqfilter(struct cdev *dev, struct knote *kn) 459 { 460 struct apm_clone_data *clone; 461 462 ACPI_LOCK(acpi); 463 clone = dev->si_drv1; 464 kn->kn_hook = clone; 465 kn->kn_fop = &apm_readfiltops; 466 knlist_add(&clone->sel_read.si_note, kn, 0); 467 ACPI_UNLOCK(acpi); 468 return (0); 469 } 470 471 static void 472 apmreadfiltdetach(struct knote *kn) 473 { 474 struct apm_clone_data *clone; 475 476 ACPI_LOCK(acpi); 477 clone = kn->kn_hook; 478 knlist_remove(&clone->sel_read.si_note, kn, 0); 479 ACPI_UNLOCK(acpi); 480 } 481 482 static int 483 apmreadfilt(struct knote *kn, long hint) 484 { 485 struct apm_clone_data *clone; 486 int sleeping; 487 488 ACPI_LOCK(acpi); 489 clone = kn->kn_hook; 490 sleeping = clone->acpi_sc->acpi_next_sstate ? 1 : 0; 491 ACPI_UNLOCK(acpi); 492 return (sleeping); 493 } 494 495 int 496 acpi_machdep_init(device_t dev) 497 { 498 struct acpi_softc *acpi_sc; 499 500 acpi_sc = devclass_get_softc(devclass_find("acpi"), 0); 501 502 /* Create a clone for /dev/acpi also. */ 503 STAILQ_INIT(&acpi_sc->apm_cdevs); 504 acpi_sc->acpi_clone = apm_create_clone(acpi_sc->acpi_dev_t, acpi_sc); 505 clone_setup(&apm_clones); 506 EVENTHANDLER_REGISTER(dev_clone, apm_clone, 0, 1000); 507 acpi_install_wakeup_handler(acpi_sc); 508 509 if (intr_model == ACPI_INTR_PIC) 510 BUS_CONFIG_INTR(dev, AcpiGbl_FADT.SciInterrupt, 511 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); 512 else 513 acpi_SetIntrModel(intr_model); 514 515 SYSCTL_ADD_UINT(&acpi_sc->acpi_sysctl_ctx, 516 SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO, 517 "reset_video", CTLFLAG_RW, &acpi_reset_video, 0, 518 "Call the VESA reset BIOS vector on the resume path"); 519 520 return (0); 521 } 522 523 void 524 acpi_SetDefaultIntrModel(int model) 525 { 526 527 intr_model = model; 528 } 529 530 /* Check BIOS date. If 1998 or older, disable ACPI. */ 531 int 532 acpi_machdep_quirks(int *quirks) 533 { 534 char *va; 535 int year; 536 537 /* BIOS address 0xffff5 contains the date in the format mm/dd/yy. */ 538 va = pmap_mapbios(0xffff0, 16); 539 sscanf(va + 11, "%2d", &year); 540 pmap_unmapbios((vm_offset_t)va, 16); 541 542 /* 543 * Date must be >= 1/1/1999 or we don't trust ACPI. Note that this 544 * check must be changed by my 114th birthday. 545 */ 546 if (year > 90 && year < 99) 547 *quirks = ACPI_Q_BROKEN; 548 549 return (0); 550 } 551 552 void 553 acpi_cpu_c1() 554 { 555 __asm __volatile("sti; hlt"); 556 } 557 558 /* 559 * Support for mapping ACPI tables during early boot. This abuses the 560 * crashdump map because the kernel cannot allocate KVA in 561 * pmap_mapbios() when this is used. This makes the following 562 * assumptions about how we use this KVA: pages 0 and 1 are used to 563 * map in the header of each table found via the RSDT or XSDT and 564 * pages 2 to n are used to map in the RSDT or XSDT. This has to use 565 * 2 pages for the table headers in case a header spans a page 566 * boundary. 567 * 568 * XXX: We don't ensure the table fits in the available address space 569 * in the crashdump map. 570 */ 571 572 /* 573 * Map some memory using the crashdump map. 'offset' is an offset in 574 * pages into the crashdump map to use for the start of the mapping. 575 */ 576 static void * 577 table_map(vm_paddr_t pa, int offset, vm_offset_t length) 578 { 579 vm_offset_t va, off; 580 void *data; 581 582 off = pa & PAGE_MASK; 583 length = roundup(length + off, PAGE_SIZE); 584 pa = pa & PG_FRAME; 585 va = (vm_offset_t)pmap_kenter_temporary(pa, offset) + 586 (offset * PAGE_SIZE); 587 data = (void *)(va + off); 588 length -= PAGE_SIZE; 589 while (length > 0) { 590 va += PAGE_SIZE; 591 pa += PAGE_SIZE; 592 length -= PAGE_SIZE; 593 pmap_kenter(va, pa); 594 invlpg(va); 595 } 596 return (data); 597 } 598 599 /* Unmap memory previously mapped with table_map(). */ 600 static void 601 table_unmap(void *data, vm_offset_t length) 602 { 603 vm_offset_t va, off; 604 605 va = (vm_offset_t)data; 606 off = va & PAGE_MASK; 607 length = roundup(length + off, PAGE_SIZE); 608 va &= ~PAGE_MASK; 609 while (length > 0) { 610 pmap_kremove(va); 611 invlpg(va); 612 va += PAGE_SIZE; 613 length -= PAGE_SIZE; 614 } 615 } 616 617 /* 618 * Map a table at a given offset into the crashdump map. It first 619 * maps the header to determine the table length and then maps the 620 * entire table. 621 */ 622 static void * 623 map_table(vm_paddr_t pa, int offset, const char *sig) 624 { 625 ACPI_TABLE_HEADER *header; 626 vm_offset_t length; 627 void *table; 628 629 header = table_map(pa, offset, sizeof(ACPI_TABLE_HEADER)); 630 if (strncmp(header->Signature, sig, ACPI_NAME_SIZE) != 0) { 631 table_unmap(header, sizeof(ACPI_TABLE_HEADER)); 632 return (NULL); 633 } 634 length = header->Length; 635 table_unmap(header, sizeof(ACPI_TABLE_HEADER)); 636 table = table_map(pa, offset, length); 637 if (ACPI_FAILURE(AcpiTbChecksum(table, length))) { 638 if (bootverbose) 639 printf("ACPI: Failed checksum for table %s\n", sig); 640 #if (ACPI_CHECKSUM_ABORT) 641 table_unmap(table, length); 642 return (NULL); 643 #endif 644 } 645 return (table); 646 } 647 648 /* 649 * See if a given ACPI table is the requested table. Returns the 650 * length of the able if it matches or zero on failure. 651 */ 652 static int 653 probe_table(vm_paddr_t address, const char *sig) 654 { 655 ACPI_TABLE_HEADER *table; 656 657 table = table_map(address, 0, sizeof(ACPI_TABLE_HEADER)); 658 if (table == NULL) { 659 if (bootverbose) 660 printf("ACPI: Failed to map table at 0x%jx\n", 661 (uintmax_t)address); 662 return (0); 663 } 664 if (bootverbose) 665 printf("Table '%.4s' at 0x%jx\n", table->Signature, 666 (uintmax_t)address); 667 668 if (strncmp(table->Signature, sig, ACPI_NAME_SIZE) != 0) { 669 table_unmap(table, sizeof(ACPI_TABLE_HEADER)); 670 return (0); 671 } 672 table_unmap(table, sizeof(ACPI_TABLE_HEADER)); 673 return (1); 674 } 675 676 /* 677 * Try to map a table at a given physical address previously returned 678 * by acpi_find_table(). 679 */ 680 void * 681 acpi_map_table(vm_paddr_t pa, const char *sig) 682 { 683 684 return (map_table(pa, 0, sig)); 685 } 686 687 /* Unmap a table previously mapped via acpi_map_table(). */ 688 void 689 acpi_unmap_table(void *table) 690 { 691 ACPI_TABLE_HEADER *header; 692 693 header = (ACPI_TABLE_HEADER *)table; 694 table_unmap(table, header->Length); 695 } 696 697 /* 698 * Return the physical address of the requested table or zero if one 699 * is not found. 700 */ 701 vm_paddr_t 702 acpi_find_table(const char *sig) 703 { 704 ACPI_PHYSICAL_ADDRESS rsdp_ptr; 705 ACPI_TABLE_RSDP *rsdp; 706 ACPI_TABLE_RSDT *rsdt; 707 ACPI_TABLE_XSDT *xsdt; 708 ACPI_TABLE_HEADER *table; 709 vm_paddr_t addr; 710 int i, count; 711 712 if (resource_disabled("acpi", 0)) 713 return (0); 714 715 /* 716 * Map in the RSDP. Since ACPI uses AcpiOsMapMemory() which in turn 717 * calls pmap_mapbios() to find the RSDP, we assume that we can use 718 * pmap_mapbios() to map the RSDP. 719 */ 720 if ((rsdp_ptr = AcpiOsGetRootPointer()) == 0) 721 return (0); 722 rsdp = pmap_mapbios(rsdp_ptr, sizeof(ACPI_TABLE_RSDP)); 723 if (rsdp == NULL) { 724 if (bootverbose) 725 printf("ACPI: Failed to map RSDP\n"); 726 return (0); 727 } 728 729 /* 730 * For ACPI >= 2.0, use the XSDT if it is available. 731 * Otherwise, use the RSDT. We map the XSDT or RSDT at page 2 732 * in the crashdump area. Pages 0 and 1 are used to map in the 733 * headers of candidate ACPI tables. 734 */ 735 addr = 0; 736 if (rsdp->Revision >= 2 && rsdp->XsdtPhysicalAddress != 0) { 737 /* 738 * AcpiOsGetRootPointer only verifies the checksum for 739 * the version 1.0 portion of the RSDP. Version 2.0 has 740 * an additional checksum that we verify first. 741 */ 742 if (AcpiTbChecksum((UINT8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)) { 743 if (bootverbose) 744 printf("ACPI: RSDP failed extended checksum\n"); 745 return (0); 746 } 747 xsdt = map_table(rsdp->XsdtPhysicalAddress, 2, ACPI_SIG_XSDT); 748 if (xsdt == NULL) { 749 if (bootverbose) 750 printf("ACPI: Failed to map XSDT\n"); 751 return (0); 752 } 753 count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) / 754 sizeof(UINT64); 755 for (i = 0; i < count; i++) 756 if (probe_table(xsdt->TableOffsetEntry[i], sig)) { 757 addr = xsdt->TableOffsetEntry[i]; 758 break; 759 } 760 acpi_unmap_table(xsdt); 761 } else { 762 rsdt = map_table(rsdp->RsdtPhysicalAddress, 2, ACPI_SIG_RSDT); 763 if (rsdt == NULL) { 764 if (bootverbose) 765 printf("ACPI: Failed to map RSDT\n"); 766 return (0); 767 } 768 count = (rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) / 769 sizeof(UINT32); 770 for (i = 0; i < count; i++) 771 if (probe_table(rsdt->TableOffsetEntry[i], sig)) { 772 addr = rsdt->TableOffsetEntry[i]; 773 break; 774 } 775 acpi_unmap_table(rsdt); 776 } 777 pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP)); 778 if (addr == 0) { 779 if (bootverbose) 780 printf("ACPI: No %s table found\n", sig); 781 return (0); 782 } 783 if (bootverbose) 784 printf("%s: Found table at 0x%jx\n", sig, (uintmax_t)addr); 785 786 /* 787 * Verify that we can map the full table and that its checksum is 788 * correct, etc. 789 */ 790 table = map_table(addr, 0, sig); 791 if (table == NULL) 792 return (0); 793 acpi_unmap_table(table); 794 795 return (addr); 796 } 797 798 /* 799 * ACPI nexus(4) driver. 800 */ 801 static int 802 nexus_acpi_probe(device_t dev) 803 { 804 int error; 805 806 error = acpi_identify(); 807 if (error) 808 return (error); 809 810 return (BUS_PROBE_DEFAULT); 811 } 812 813 static int 814 nexus_acpi_attach(device_t dev) 815 { 816 817 nexus_init_resources(); 818 bus_generic_probe(dev); 819 if (BUS_ADD_CHILD(dev, 10, "acpi", 0) == NULL) 820 panic("failed to add acpi0 device"); 821 822 return (bus_generic_attach(dev)); 823 } 824 825 static device_method_t nexus_acpi_methods[] = { 826 /* Device interface */ 827 DEVMETHOD(device_probe, nexus_acpi_probe), 828 DEVMETHOD(device_attach, nexus_acpi_attach), 829 830 { 0, 0 } 831 }; 832 833 DEFINE_CLASS_1(nexus, nexus_acpi_driver, nexus_acpi_methods, 1, nexus_driver); 834 static devclass_t nexus_devclass; 835 836 DRIVER_MODULE(nexus_acpi, root, nexus_acpi_driver, nexus_devclass, 0, 0);
Cache object: 8e663b2616a87dd0bd1952129b9b48e9
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