sys/x86/acpica/madt.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/bus.h>
  35 #include <sys/kernel.h>
  36 #include <sys/limits.h>
  37 #include <sys/malloc.h>
  38 #include <sys/smp.h>
  39 #include <vm/vm.h>
  40 #include <vm/pmap.h>
  41
  42 #include <x86/apicreg.h>
  43 #include <machine/intr_machdep.h>
  44 #include <x86/apicvar.h>
  45 #include <machine/md_var.h>
  46 #include <x86/vmware.h>
  47
  48 #include <contrib/dev/acpica/include/acpi.h>
  49 #include <contrib/dev/acpica/include/aclocal.h>
  50 #include <contrib/dev/acpica/include/actables.h>
  51
  52 #include <dev/acpica/acpivar.h>
  53 #include <dev/pci/pcivar.h>
  54
  55 /* These two arrays are indexed by APIC IDs. */
  56 static struct {
  57         void *io_apic;
  58         UINT32 io_vector;
  59 } *ioapics;
  60
  61 static struct lapic_info {
  62         u_int la_enabled;
  63         u_int la_acpi_id;
  64 } *lapics;
  65
  66 int madt_found_sci_override;
  67 static ACPI_TABLE_MADT *madt;
  68 static vm_paddr_t madt_physaddr;
  69 static vm_offset_t madt_length;
  70
  71 static MALLOC_DEFINE(M_MADT, "madt_table", "ACPI MADT Table Items");
  72
  73 static enum intr_polarity interrupt_polarity(UINT16 IntiFlags, UINT8 Source);
  74 static enum intr_trigger interrupt_trigger(UINT16 IntiFlags, UINT8 Source);
  75 static int      madt_find_cpu(u_int acpi_id, u_int *apic_id);
  76 static int      madt_find_interrupt(int intr, void **apic, u_int *pin);
  77 static void     madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg);
  78 static void     madt_parse_interrupt_override(
  79                     ACPI_MADT_INTERRUPT_OVERRIDE *intr);
  80 static void     madt_parse_ints(ACPI_SUBTABLE_HEADER *entry,
  81                     void *arg __unused);
  82 static void     madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi);
  83 static void     madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi);
  84 static int      madt_probe(void);
  85 static int      madt_probe_cpus(void);
  86 static void     madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry,
  87                     void *arg __unused);
  88 static void     madt_setup_cpus_handler(ACPI_SUBTABLE_HEADER *entry,
  89                     void *arg __unused);
  90 static void     madt_register(void *dummy);
  91 static int      madt_setup_local(void);
  92 static int      madt_setup_io(void);
  93 static void     madt_walk_table(acpi_subtable_handler *handler, void *arg);
  94
  95 static struct apic_enumerator madt_enumerator = {
  96         .apic_name = "MADT",
  97         .apic_probe = madt_probe,
  98         .apic_probe_cpus = madt_probe_cpus,
  99         .apic_setup_local = madt_setup_local,
 100         .apic_setup_io = madt_setup_io
 101 };
 102
 103 /*
 104  * Look for an ACPI Multiple APIC Description Table ("APIC")
 105  */
 106 static int
 107 madt_probe(void)
 108 {
 109
 110         madt_physaddr = acpi_find_table(ACPI_SIG_MADT);
 111         if (madt_physaddr == 0)
 112                 return (ENXIO);
 113         return (-50);
 114 }
 115
 116 /*
 117  * Run through the MP table enumerating CPUs.
 118  */
 119 static int
 120 madt_probe_cpus(void)
 121 {
 122
 123         madt = acpi_map_table(madt_physaddr, ACPI_SIG_MADT);
 124         madt_length = madt->Header.Length;
 125         KASSERT(madt != NULL, ("Unable to re-map MADT"));
 126         madt_walk_table(madt_probe_cpus_handler, NULL);
 127         acpi_unmap_table(madt);
 128         madt = NULL;
 129         return (0);
 130 }
 131
 132 /*
 133  * Initialize the local APIC on the BSP.
 134  */
 135 static int
 136 madt_setup_local(void)
 137 {
 138         ACPI_TABLE_DMAR *dmartbl;
 139         vm_paddr_t dmartbl_physaddr;
 140         const char *reason;
 141         char *hw_vendor;
 142         u_int p[4];
 143         int user_x2apic;
 144         bool bios_x2apic;
 145
 146         if ((cpu_feature2 & CPUID2_X2APIC) != 0) {
 147                 reason = NULL;
 148
 149                 /*
 150                  * Automatically detect several configurations where
 151                  * x2APIC mode is known to cause troubles.  User can
 152                  * override the setting with hw.x2apic_enable tunable.
 153                  */
 154                 dmartbl_physaddr = acpi_find_table(ACPI_SIG_DMAR);
 155                 if (dmartbl_physaddr != 0) {
 156                         dmartbl = acpi_map_table(dmartbl_physaddr,
 157                             ACPI_SIG_DMAR);
 158                         if ((dmartbl->Flags & ACPI_DMAR_X2APIC_OPT_OUT) != 0)
 159                                 reason = "by DMAR table";
 160                         acpi_unmap_table(dmartbl);
 161                 }
 162                 if (vm_guest == VM_GUEST_VMWARE) {
 163                         vmware_hvcall(VMW_HVCMD_GETVCPU_INFO, p);
 164                         if ((p[0] & VMW_VCPUINFO_VCPU_RESERVED) != 0 ||
 165                             (p[0] & VMW_VCPUINFO_LEGACY_X2APIC) == 0)
 166                                 reason =
 167                                     "inside VMWare without intr redirection";
 168                 } else if (vm_guest == VM_GUEST_XEN) {
 169                         reason = "due to running under XEN";
 170                 } else if (vm_guest == VM_GUEST_NO &&
 171                     CPUID_TO_FAMILY(cpu_id) == 0x6 &&
 172                     CPUID_TO_MODEL(cpu_id) == 0x2a) {
 173                         hw_vendor = kern_getenv("smbios.planar.maker");
 174                         /*
 175                          * It seems that some Lenovo and ASUS
 176                          * SandyBridge-based notebook BIOSes have a
 177                          * bug which prevents booting AP in x2APIC
 178                          * mode.  Since the only way to detect mobile
 179                          * CPU is to check northbridge pci id, which
 180                          * cannot be done that early, disable x2APIC
 181                          * for all Lenovo and ASUS SandyBridge
 182                          * machines.
 183                          */
 184                         if (hw_vendor != NULL) {
 185                                 if (!strcmp(hw_vendor, "LENOVO") ||
 186                                     !strcmp(hw_vendor,
 187                                     "ASUSTeK Computer Inc.")) {
 188                                         reason =
 189                                     "for a suspected SandyBridge BIOS bug";
 190                                 }
 191                                 freeenv(hw_vendor);
 192                         }
 193                 }
 194                 bios_x2apic = lapic_is_x2apic();
 195                 if (reason != NULL && bios_x2apic) {
 196                         if (bootverbose)
 197                                 printf("x2APIC should be disabled %s but "
 198                                     "already enabled by BIOS; enabling.\n",
 199                                      reason);
 200                         reason = NULL;
 201                 }
 202                 if (reason == NULL)
 203                         x2apic_mode = 1;
 204                 else if (bootverbose)
 205                         printf("x2APIC available but disabled %s\n", reason);
 206                 user_x2apic = x2apic_mode;
 207                 TUNABLE_INT_FETCH("hw.x2apic_enable", &user_x2apic);
 208                 if (user_x2apic != x2apic_mode) {
 209                         if (bios_x2apic && !user_x2apic)
 210                                 printf("x2APIC disabled by tunable and "
 211                                     "enabled by BIOS; ignoring tunable.");
 212                         else
 213                                 x2apic_mode = user_x2apic;
 214                 }
 215         }
 216
 217         /*
 218          * Truncate max_apic_id if not in x2APIC mode. Some structures
 219          * will already be allocated with the previous max_apic_id, but
 220          * at least we can prevent wasting more memory elsewhere.
 221          */
 222         if (!x2apic_mode)
 223                 max_apic_id = min(max_apic_id, xAPIC_MAX_APIC_ID);
 224
 225         madt = pmap_mapbios(madt_physaddr, madt_length);
 226         lapics = malloc(sizeof(*lapics) * (max_apic_id + 1), M_MADT,
 227             M_WAITOK | M_ZERO);
 228         madt_walk_table(madt_setup_cpus_handler, NULL);
 229
 230         lapic_init(madt->Address);
 231         printf("ACPI APIC Table: <%.*s %.*s>\n",
 232             (int)sizeof(madt->Header.OemId), madt->Header.OemId,
 233             (int)sizeof(madt->Header.OemTableId), madt->Header.OemTableId);
 234
 235         /*
 236          * We ignore 64-bit local APIC override entries.  Should we
 237          * perhaps emit a warning here if we find one?
 238          */
 239         return (0);
 240 }
 241
 242 /*
 243  * Enumerate I/O APICs and setup interrupt sources.
 244  */
 245 static int
 246 madt_setup_io(void)
 247 {
 248         void *ioapic;
 249         u_int pin;
 250         int i;
 251
 252         KASSERT(lapics != NULL, ("local APICs not initialized"));
 253
 254         /* Try to initialize ACPI so that we can access the FADT. */
 255         i = acpi_Startup();
 256         if (ACPI_FAILURE(i)) {
 257                 printf("MADT: ACPI Startup failed with %s\n",
 258                     AcpiFormatException(i));
 259                 printf("Try disabling either ACPI or apic support.\n");
 260                 panic("Using MADT but ACPI doesn't work");
 261         }
 262
 263         ioapics = malloc(sizeof(*ioapics) * (IOAPIC_MAX_ID + 1), M_MADT,
 264             M_WAITOK | M_ZERO);
 265
 266         /* First, we run through adding I/O APIC's. */
 267         madt_walk_table(madt_parse_apics, NULL);
 268
 269         /* Second, we run through the table tweaking interrupt sources. */
 270         madt_walk_table(madt_parse_ints, NULL);
 271
 272         /*
 273          * If there was not an explicit override entry for the SCI,
 274          * force it to use level trigger and active-low polarity.
 275          */
 276         if (!madt_found_sci_override) {
 277                 if (madt_find_interrupt(AcpiGbl_FADT.SciInterrupt, &ioapic,
 278                     &pin) != 0)
 279                         printf("MADT: Could not find APIC for SCI IRQ %u\n",
 280                             AcpiGbl_FADT.SciInterrupt);
 281                 else {
 282                         printf(
 283         "MADT: Forcing active-low polarity and level trigger for SCI\n");
 284                         ioapic_set_polarity(ioapic, pin, INTR_POLARITY_LOW);
 285                         ioapic_set_triggermode(ioapic, pin, INTR_TRIGGER_LEVEL);
 286                 }
 287         }
 288
 289         /* Third, we register all the I/O APIC's. */
 290         for (i = 0; i <= IOAPIC_MAX_ID; i++)
 291                 if (ioapics[i].io_apic != NULL)
 292                         ioapic_register(ioapics[i].io_apic);
 293
 294         /* Finally, we throw the switch to enable the I/O APIC's. */
 295         acpi_SetDefaultIntrModel(ACPI_INTR_APIC);
 296
 297         free(ioapics, M_MADT);
 298         ioapics = NULL;
 299
 300         /* NB: this is the last use of the lapics array. */
 301         free(lapics, M_MADT);
 302         lapics = NULL;
 303
 304         return (0);
 305 }
 306
 307 static void
 308 madt_register(void *dummy __unused)
 309 {
 310
 311         apic_register_enumerator(&madt_enumerator);
 312 }
 313 SYSINIT(madt_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, madt_register, NULL);
 314
 315 /*
 316  * Call the handler routine for each entry in the MADT table.
 317  */
 318 static void
 319 madt_walk_table(acpi_subtable_handler *handler, void *arg)
 320 {
 321
 322         acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length,
 323             handler, arg);
 324 }
 325
 326 static void
 327 madt_parse_cpu(unsigned int apic_id, unsigned int flags)
 328 {
 329
 330         if (!(flags & ACPI_MADT_ENABLED) ||
 331 #ifdef SMP
 332             mp_ncpus == MAXCPU ||
 333 #endif
 334             apic_id > MAX_APIC_ID)
 335                 return;
 336
 337 #ifdef SMP
 338         mp_ncpus++;
 339         mp_maxid = mp_ncpus - 1;
 340 #endif
 341         max_apic_id = max(apic_id, max_apic_id);
 342 }
 343
 344 static void
 345 madt_add_cpu(u_int acpi_id, u_int apic_id, u_int flags)
 346 {
 347         struct lapic_info *la;
 348
 349         /*
 350          * The MADT does not include a BSP flag, so we have to let the
 351          * MP code figure out which CPU is the BSP on its own.
 352          */
 353         if (bootverbose)
 354                 printf("MADT: Found CPU APIC ID %u ACPI ID %u: %s\n",
 355                     apic_id, acpi_id, flags & ACPI_MADT_ENABLED ?
 356                     "enabled" : "disabled");
 357         if (!(flags & ACPI_MADT_ENABLED))
 358                 return;
 359         if (apic_id > max_apic_id) {
 360                 printf("MADT: Ignoring local APIC ID %u (too high)\n",
 361                     apic_id);
 362                 return;
 363         }
 364
 365         la = &lapics[apic_id];
 366         KASSERT(la->la_enabled == 0, ("Duplicate local APIC ID %u", apic_id));
 367         la->la_enabled = 1;
 368         la->la_acpi_id = acpi_id;
 369         lapic_create(apic_id, 0);
 370 }
 371
 372 static void
 373 madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg)
 374 {
 375         ACPI_MADT_LOCAL_APIC *proc;
 376         ACPI_MADT_LOCAL_X2APIC *x2apic;
 377
 378         switch (entry->Type) {
 379         case ACPI_MADT_TYPE_LOCAL_APIC:
 380                 proc = (ACPI_MADT_LOCAL_APIC *)entry;
 381                 madt_parse_cpu(proc->Id, proc->LapicFlags);
 382                 break;
 383         case ACPI_MADT_TYPE_LOCAL_X2APIC:
 384                 x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry;
 385                 madt_parse_cpu(x2apic->LocalApicId, x2apic->LapicFlags);
 386                 break;
 387         }
 388 }
 389
 390 static void
 391 madt_setup_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg)
 392 {
 393         ACPI_MADT_LOCAL_APIC *proc;
 394         ACPI_MADT_LOCAL_X2APIC *x2apic;
 395
 396         switch (entry->Type) {
 397         case ACPI_MADT_TYPE_LOCAL_APIC:
 398                 proc = (ACPI_MADT_LOCAL_APIC *)entry;
 399                 madt_add_cpu(proc->ProcessorId, proc->Id, proc->LapicFlags);
 400                 break;
 401         case ACPI_MADT_TYPE_LOCAL_X2APIC:
 402                 x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry;
 403                 madt_add_cpu(x2apic->Uid, x2apic->LocalApicId,
 404                     x2apic->LapicFlags);
 405                 break;
 406         }
 407 }
 408
 409
 410 /*
 411  * Add an I/O APIC from an entry in the table.
 412  */
 413 static void
 414 madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
 415 {
 416         ACPI_MADT_IO_APIC *apic;
 417
 418         switch (entry->Type) {
 419         case ACPI_MADT_TYPE_IO_APIC:
 420                 apic = (ACPI_MADT_IO_APIC *)entry;
 421                 if (bootverbose)
 422                         printf(
 423                             "MADT: Found IO APIC ID %u, Interrupt %u at %p\n",
 424                             apic->Id, apic->GlobalIrqBase,
 425                             (void *)(uintptr_t)apic->Address);
 426                 if (apic->Id > IOAPIC_MAX_ID)
 427                         panic("%s: I/O APIC ID %u too high", __func__,
 428                             apic->Id);
 429                 if (ioapics[apic->Id].io_apic != NULL)
 430                         panic("%s: Double APIC ID %u", __func__, apic->Id);
 431                 ioapics[apic->Id].io_apic = ioapic_create(apic->Address,
 432                     apic->Id, apic->GlobalIrqBase);
 433                 ioapics[apic->Id].io_vector = apic->GlobalIrqBase;
 434                 break;
 435         default:
 436                 break;
 437         }
 438 }
 439
 440 /*
 441  * Determine properties of an interrupt source.  Note that for ACPI these
 442  * functions are only used for ISA interrupts, so we assume ISA bus values
 443  * (Active Hi, Edge Triggered) for conforming values except for the ACPI
 444  * SCI for which we use Active Lo, Level Triggered.
 445  */
 446 static enum intr_polarity
 447 interrupt_polarity(UINT16 IntiFlags, UINT8 Source)
 448 {
 449
 450         switch (IntiFlags & ACPI_MADT_POLARITY_MASK) {
 451         default:
 452                 printf("WARNING: Bogus Interrupt Polarity. Assume CONFORMS\n");
 453                 /* FALLTHROUGH*/
 454         case ACPI_MADT_POLARITY_CONFORMS:
 455                 if (Source == AcpiGbl_FADT.SciInterrupt)
 456                         return (INTR_POLARITY_LOW);
 457                 else
 458                         return (INTR_POLARITY_HIGH);
 459         case ACPI_MADT_POLARITY_ACTIVE_HIGH:
 460                 return (INTR_POLARITY_HIGH);
 461         case ACPI_MADT_POLARITY_ACTIVE_LOW:
 462                 return (INTR_POLARITY_LOW);
 463         }
 464 }
 465
 466 static enum intr_trigger
 467 interrupt_trigger(UINT16 IntiFlags, UINT8 Source)
 468 {
 469
 470         switch (IntiFlags & ACPI_MADT_TRIGGER_MASK) {
 471         default:
 472                 printf("WARNING: Bogus Interrupt Trigger Mode. Assume CONFORMS.\n");
 473                 /*FALLTHROUGH*/
 474         case ACPI_MADT_TRIGGER_CONFORMS:
 475                 if (Source == AcpiGbl_FADT.SciInterrupt)
 476                         return (INTR_TRIGGER_LEVEL);
 477                 else
 478                         return (INTR_TRIGGER_EDGE);
 479         case ACPI_MADT_TRIGGER_EDGE:
 480                 return (INTR_TRIGGER_EDGE);
 481         case ACPI_MADT_TRIGGER_LEVEL:
 482                 return (INTR_TRIGGER_LEVEL);
 483         }
 484 }
 485
 486 /*
 487  * Find the local APIC ID associated with a given ACPI Processor ID.
 488  */
 489 static int
 490 madt_find_cpu(u_int acpi_id, u_int *apic_id)
 491 {
 492         int i;
 493
 494         for (i = 0; i <= max_apic_id; i++) {
 495                 if (!lapics[i].la_enabled)
 496                         continue;
 497                 if (lapics[i].la_acpi_id != acpi_id)
 498                         continue;
 499                 *apic_id = i;
 500                 return (0);
 501         }
 502         return (ENOENT);
 503 }
 504
 505 /*
 506  * Find the IO APIC and pin on that APIC associated with a given global
 507  * interrupt.
 508  */
 509 static int
 510 madt_find_interrupt(int intr, void **apic, u_int *pin)
 511 {
 512         int i, best;
 513
 514         best = -1;
 515         for (i = 0; i <= IOAPIC_MAX_ID; i++) {
 516                 if (ioapics[i].io_apic == NULL ||
 517                     ioapics[i].io_vector > intr)
 518                         continue;
 519                 if (best == -1 ||
 520                     ioapics[best].io_vector < ioapics[i].io_vector)
 521                         best = i;
 522         }
 523         if (best == -1)
 524                 return (ENOENT);
 525         *apic = ioapics[best].io_apic;
 526         *pin = intr - ioapics[best].io_vector;
 527         if (*pin > 32)
 528                 printf("WARNING: Found intpin of %u for vector %d\n", *pin,
 529                     intr);
 530         return (0);
 531 }
 532
 533 void
 534 madt_parse_interrupt_values(void *entry,
 535     enum intr_trigger *trig, enum intr_polarity *pol)
 536 {
 537         ACPI_MADT_INTERRUPT_OVERRIDE *intr;
 538         char buf[64];
 539
 540         intr = entry;
 541
 542         if (bootverbose)
 543                 printf("MADT: Interrupt override: source %u, irq %u\n",
 544                     intr->SourceIrq, intr->GlobalIrq);
 545         KASSERT(intr->Bus == 0, ("bus for interrupt overrides must be zero"));
 546
 547         /*
 548          * Lookup the appropriate trigger and polarity modes for this
 549          * entry.
 550          */
 551         *trig = interrupt_trigger(intr->IntiFlags, intr->SourceIrq);
 552         *pol = interrupt_polarity(intr->IntiFlags, intr->SourceIrq);
 553
 554         /*
 555          * If the SCI is identity mapped but has edge trigger and
 556          * active-hi polarity or the force_sci_lo tunable is set,
 557          * force it to use level/lo.
 558          */
 559         if (intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) {
 560                 madt_found_sci_override = 1;
 561                 if (getenv_string("hw.acpi.sci.trigger", buf, sizeof(buf))) {
 562                         if (tolower(buf[0]) == 'e')
 563                                 *trig = INTR_TRIGGER_EDGE;
 564                         else if (tolower(buf[0]) == 'l')
 565                                 *trig = INTR_TRIGGER_LEVEL;
 566                         else
 567                                 panic(
 568                                 "Invalid trigger %s: must be 'edge' or 'level'",
 569                                     buf);
 570                         printf("MADT: Forcing SCI to %s trigger\n",
 571                             *trig == INTR_TRIGGER_EDGE ? "edge" : "level");
 572                 }
 573                 if (getenv_string("hw.acpi.sci.polarity", buf, sizeof(buf))) {
 574                         if (tolower(buf[0]) == 'h')
 575                                 *pol = INTR_POLARITY_HIGH;
 576                         else if (tolower(buf[0]) == 'l')
 577                                 *pol = INTR_POLARITY_LOW;
 578                         else
 579                                 panic(
 580                                 "Invalid polarity %s: must be 'high' or 'low'",
 581                                     buf);
 582                         printf("MADT: Forcing SCI to active %s polarity\n",
 583                             *pol == INTR_POLARITY_HIGH ? "high" : "low");
 584                 }
 585         }
 586 }
 587
 588 /*
 589  * Parse an interrupt source override for an ISA interrupt.
 590  */
 591 static void
 592 madt_parse_interrupt_override(ACPI_MADT_INTERRUPT_OVERRIDE *intr)
 593 {
 594         void *new_ioapic, *old_ioapic;
 595         u_int new_pin, old_pin;
 596         enum intr_trigger trig;
 597         enum intr_polarity pol;
 598
 599         if (acpi_quirks & ACPI_Q_MADT_IRQ0 && intr->SourceIrq == 0 &&
 600             intr->GlobalIrq == 2) {
 601                 if (bootverbose)
 602                         printf("MADT: Skipping timer override\n");
 603                 return;
 604         }
 605
 606         if (madt_find_interrupt(intr->GlobalIrq, &new_ioapic, &new_pin) != 0) {
 607                 printf("MADT: Could not find APIC for vector %u (IRQ %u)\n",
 608                     intr->GlobalIrq, intr->SourceIrq);
 609                 return;
 610         }
 611
 612         madt_parse_interrupt_values(intr, &trig, &pol);
 613
 614         /* Remap the IRQ if it is mapped to a different interrupt vector. */
 615         if (intr->SourceIrq != intr->GlobalIrq) {
 616                 /*
 617                  * If the SCI is remapped to a non-ISA global interrupt,
 618                  * then override the vector we use to setup and allocate
 619                  * the interrupt.
 620                  */
 621                 if (intr->GlobalIrq > 15 &&
 622                     intr->SourceIrq == AcpiGbl_FADT.SciInterrupt)
 623                         acpi_OverrideInterruptLevel(intr->GlobalIrq);
 624                 else
 625                         ioapic_remap_vector(new_ioapic, new_pin,
 626                             intr->SourceIrq);
 627                 if (madt_find_interrupt(intr->SourceIrq, &old_ioapic,
 628                     &old_pin) != 0)
 629                         printf("MADT: Could not find APIC for source IRQ %u\n",
 630                             intr->SourceIrq);
 631                 else if (ioapic_get_vector(old_ioapic, old_pin) ==
 632                     intr->SourceIrq)
 633                         ioapic_disable_pin(old_ioapic, old_pin);
 634         }
 635
 636         /* Program the polarity and trigger mode. */
 637         ioapic_set_triggermode(new_ioapic, new_pin, trig);
 638         ioapic_set_polarity(new_ioapic, new_pin, pol);
 639 }
 640
 641 /*
 642  * Parse an entry for an NMI routed to an IO APIC.
 643  */
 644 static void
 645 madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi)
 646 {
 647         void *ioapic;
 648         u_int pin;
 649
 650         if (madt_find_interrupt(nmi->GlobalIrq, &ioapic, &pin) != 0) {
 651                 printf("MADT: Could not find APIC for vector %u\n",
 652                     nmi->GlobalIrq);
 653                 return;
 654         }
 655
 656         ioapic_set_nmi(ioapic, pin);
 657         if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
 658                 ioapic_set_triggermode(ioapic, pin,
 659                     interrupt_trigger(nmi->IntiFlags, 0));
 660         if (!(nmi->IntiFlags & ACPI_MADT_POLARITY_CONFORMS))
 661                 ioapic_set_polarity(ioapic, pin,
 662                     interrupt_polarity(nmi->IntiFlags, 0));
 663 }
 664
 665 /*
 666  * Parse an entry for an NMI routed to a local APIC LVT pin.
 667  */
 668 static void
 669 madt_handle_local_nmi(u_int acpi_id, UINT8 Lint, UINT16 IntiFlags)
 670 {
 671         u_int apic_id, pin;
 672
 673         if (acpi_id == 0xffffffff)
 674                 apic_id = APIC_ID_ALL;
 675         else if (madt_find_cpu(acpi_id, &apic_id) != 0) {
 676                 if (bootverbose)
 677                         printf("MADT: Ignoring local NMI routed to "
 678                             "ACPI CPU %u\n", acpi_id);
 679                 return;
 680         }
 681         if (Lint == 0)
 682                 pin = APIC_LVT_LINT0;
 683         else
 684                 pin = APIC_LVT_LINT1;
 685         lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI);
 686         if (!(IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
 687                 lapic_set_lvt_triggermode(apic_id, pin,
 688                     interrupt_trigger(IntiFlags, 0));
 689         if (!(IntiFlags & ACPI_MADT_POLARITY_CONFORMS))
 690                 lapic_set_lvt_polarity(apic_id, pin,
 691                     interrupt_polarity(IntiFlags, 0));
 692 }
 693
 694 static void
 695 madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi)
 696 {
 697
 698         madt_handle_local_nmi(nmi->ProcessorId == 0xff ? 0xffffffff :
 699             nmi->ProcessorId, nmi->Lint, nmi->IntiFlags);
 700 }
 701
 702 static void
 703 madt_parse_local_x2apic_nmi(ACPI_MADT_LOCAL_X2APIC_NMI *nmi)
 704 {
 705
 706         madt_handle_local_nmi(nmi->Uid, nmi->Lint, nmi->IntiFlags);
 707 }
 708
 709 /*
 710  * Parse interrupt entries.
 711  */
 712 static void
 713 madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
 714 {
 715
 716         switch (entry->Type) {
 717         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
 718                 madt_parse_interrupt_override(
 719                         (ACPI_MADT_INTERRUPT_OVERRIDE *)entry);
 720                 break;
 721         case ACPI_MADT_TYPE_NMI_SOURCE:
 722                 madt_parse_nmi((ACPI_MADT_NMI_SOURCE *)entry);
 723                 break;
 724         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 725                 madt_parse_local_nmi((ACPI_MADT_LOCAL_APIC_NMI *)entry);
 726                 break;
 727         case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
 728                 madt_parse_local_x2apic_nmi(
 729                     (ACPI_MADT_LOCAL_X2APIC_NMI *)entry);
 730                 break;
 731         }
 732 }
 733
 734 /*
 735  * Setup per-CPU ACPI IDs.
 736  */
 737 static void
 738 madt_set_ids(void *dummy)
 739 {
 740         struct lapic_info *la;
 741         struct pcpu *pc;
 742         u_int i;
 743
 744         if (madt == NULL)
 745                 return;
 746
 747         KASSERT(lapics != NULL, ("local APICs not initialized"));
 748
 749         CPU_FOREACH(i) {
 750                 pc = pcpu_find(i);
 751                 KASSERT(pc != NULL, ("no pcpu data for CPU %u", i));
 752                 la = &lapics[pc->pc_apic_id];
 753                 if (!la->la_enabled)
 754                         panic("APIC: CPU with APIC ID %u is not enabled",
 755                             pc->pc_apic_id);
 756                 pc->pc_acpi_id = la->la_acpi_id;
 757                 if (bootverbose)
 758                         printf("APIC: CPU %u has ACPI ID %u\n", i,
 759                             la->la_acpi_id);
 760         }
 761 }
 762 SYSINIT(madt_set_ids, SI_SUB_CPU, SI_ORDER_MIDDLE, madt_set_ids, NULL);