sys/platform/pc64/acpica5/acpi_madt.c

   1 /*
   2  * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Sepherosa Ziehau <sepherosa@gmail.com>
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/bus.h>
  37 #include <sys/kernel.h>
  38 #include <sys/systm.h>
  39
  40 #include <machine_base/isa/isa_intr.h>
  41 #include <machine_base/apic/lapic.h>
  42 #include <machine_base/apic/ioapic.h>
  43 #include <machine_base/apic/apicvar.h>
  44
  45 #include "acpi_sdt.h"
  46 #include "acpi_sdt_var.h"
  47
  48 extern int naps;
  49
  50 #define MADT_VPRINTF(fmt, arg...) \
  51 do { \
  52         if (bootverbose) \
  53                 kprintf("ACPI MADT: " fmt , ##arg); \
  54 } while (0)
  55
  56 /* Multiple APIC Description Table */
  57 struct acpi_madt {
  58         struct acpi_sdth        madt_hdr;
  59         uint32_t                madt_lapic_addr;
  60         uint32_t                madt_flags;
  61         uint8_t                 madt_ents[1];
  62 } __packed;
  63
  64 /* Common parts of MADT APIC structure */
  65 struct acpi_madt_ent {
  66         uint8_t                 me_type;        /* MADT_ENT_ */
  67         uint8_t                 me_len;
  68 } __packed;
  69
  70 #define MADT_ENT_LAPIC          0
  71 #define MADT_ENT_IOAPIC         1
  72 #define MADT_ENT_INTSRC         2
  73 #define MADT_ENT_LAPIC_ADDR     5
  74
  75 /* MADT Processor Local APIC */
  76 struct acpi_madt_lapic {
  77         struct acpi_madt_ent    ml_hdr;
  78         uint8_t                 ml_cpu_id;
  79         uint8_t                 ml_apic_id;
  80         uint32_t                ml_flags;       /* MADT_LAPIC_ */
  81 } __packed;
  82
  83 #define MADT_LAPIC_ENABLED      0x1
  84
  85 /* MADT I/O APIC */
  86 struct acpi_madt_ioapic {
  87         struct acpi_madt_ent    mio_hdr;
  88         uint8_t                 mio_apic_id;
  89         uint8_t                 mio_reserved;
  90         uint32_t                mio_addr;
  91         uint32_t                mio_gsi_base;
  92 } __packed;
  93
  94 /* MADT Interrupt Source Override */
  95 struct acpi_madt_intsrc {
  96         struct acpi_madt_ent    mint_hdr;
  97         uint8_t                 mint_bus;       /* MADT_INT_BUS_ */
  98         uint8_t                 mint_src;
  99         uint32_t                mint_gsi;
 100         uint16_t                mint_flags;     /* MADT_INT_ */
 101 } __packed;
 102
 103 #define MADT_INT_BUS_ISA        0
 104
 105 #define MADT_INT_POLA_MASK      0x3
 106 #define MADT_INT_POLA_SHIFT     0
 107 #define MADT_INT_POLA_CONFORM   0
 108 #define MADT_INT_POLA_HIGH      1
 109 #define MADT_INT_POLA_RSVD      2
 110 #define MADT_INT_POLA_LOW       3
 111 #define MADT_INT_TRIG_MASK      0xc
 112 #define MADT_INT_TRIG_SHIFT     2
 113 #define MADT_INT_TRIG_CONFORM   0
 114 #define MADT_INT_TRIG_EDGE      1
 115 #define MADT_INT_TRIG_RSVD      2
 116 #define MADT_INT_TRIG_LEVEL     3
 117
 118 /* MADT Local APIC Address Override */
 119 struct acpi_madt_lapic_addr {
 120         struct acpi_madt_ent    mla_hdr;
 121         uint16_t                mla_reserved;
 122         uint64_t                mla_lapic_addr;
 123 } __packed;
 124
 125 typedef int                     (*madt_iter_t)(void *,
 126                                     const struct acpi_madt_ent *);
 127
 128 static int                      madt_check(vm_paddr_t);
 129 static int                      madt_iterate_entries(struct acpi_madt *,
 130                                     madt_iter_t, void *);
 131
 132 static vm_paddr_t               madt_lapic_pass1(void);
 133 static int                      madt_lapic_pass2(int);
 134
 135 static int                      madt_lapic_enumerate(struct lapic_enumerator *);
 136 static int                      madt_lapic_probe(struct lapic_enumerator *);
 137
 138 static void                     madt_ioapic_enumerate(
 139                                     struct ioapic_enumerator *);
 140 static int                      madt_ioapic_probe(struct ioapic_enumerator *);
 141
 142 static vm_paddr_t               madt_phyaddr;
 143
 144 static void
 145 madt_probe(void)
 146 {
 147         vm_paddr_t madt_paddr;
 148
 149         KKASSERT(madt_phyaddr == 0);
 150
 151         madt_paddr = sdt_search(ACPI_MADT_SIG);
 152         if (madt_paddr == 0) {
 153                 kprintf("madt_probe: can't locate MADT\n");
 154                 return;
 155         }
 156
 157         /* Preliminary checks */
 158         if (madt_check(madt_paddr)) {
 159                 kprintf("madt_probe: madt_check failed\n");
 160                 return;
 161         }
 162
 163         madt_phyaddr = madt_paddr;
 164 }
 165 SYSINIT(madt_probe, SI_BOOT2_PRESMP, SI_ORDER_SECOND, madt_probe, 0);
 166
 167 static int
 168 madt_check(vm_paddr_t madt_paddr)
 169 {
 170         struct acpi_madt *madt;
 171         int error = 0;
 172
 173         KKASSERT(madt_paddr != 0);
 174
 175         madt = sdt_sdth_map(madt_paddr);
 176         KKASSERT(madt != NULL);
 177
 178         /*
 179          * MADT in ACPI specification 1.0 - 4.0
 180          */
 181         if (madt->madt_hdr.sdth_rev < 1 || madt->madt_hdr.sdth_rev > 3) {
 182                 kprintf("madt_check: unsupported MADT revision %d\n",
 183                         madt->madt_hdr.sdth_rev);
 184                 error = EOPNOTSUPP;
 185                 goto back;
 186         }
 187
 188         if (madt->madt_hdr.sdth_len <
 189             sizeof(*madt) - sizeof(madt->madt_ents)) {
 190                 kprintf("madt_check: invalid MADT length %u\n",
 191                         madt->madt_hdr.sdth_len);
 192                 error = EINVAL;
 193                 goto back;
 194         }
 195 back:
 196         sdt_sdth_unmap(&madt->madt_hdr);
 197         return error;
 198 }
 199
 200 static int
 201 madt_iterate_entries(struct acpi_madt *madt, madt_iter_t func, void *arg)
 202 {
 203         int size, cur, error;
 204
 205         size = madt->madt_hdr.sdth_len -
 206                (sizeof(*madt) - sizeof(madt->madt_ents));
 207         cur = 0;
 208         error = 0;
 209
 210         while (size - cur > sizeof(struct acpi_madt_ent)) {
 211                 const struct acpi_madt_ent *ent;
 212
 213                 ent = (const struct acpi_madt_ent *)&madt->madt_ents[cur];
 214                 if (ent->me_len < sizeof(*ent)) {
 215                         kprintf("madt_iterate_entries: invalid MADT "
 216                                 "entry len %d\n", ent->me_len);
 217                         error = EINVAL;
 218                         break;
 219                 }
 220                 if (ent->me_len > (size - cur)) {
 221                         kprintf("madt_iterate_entries: invalid MADT "
 222                                 "entry len %d, > table length\n", ent->me_len);
 223                         error = EINVAL;
 224                         break;
 225                 }
 226
 227                 cur += ent->me_len;
 228
 229                 /*
 230                  * Only Local APIC, I/O APIC and Interrupt Source Override
 231                  * are defined in ACPI specification 1.0 - 4.0
 232                  */
 233                 switch (ent->me_type) {
 234                 case MADT_ENT_LAPIC:
 235                         if (ent->me_len < sizeof(struct acpi_madt_lapic)) {
 236                                 kprintf("madt_iterate_entries: invalid MADT "
 237                                         "lapic entry len %d\n", ent->me_len);
 238                                 error = EINVAL;
 239                         }
 240                         break;
 241
 242                 case MADT_ENT_IOAPIC:
 243                         if (ent->me_len < sizeof(struct acpi_madt_ioapic)) {
 244                                 kprintf("madt_iterate_entries: invalid MADT "
 245                                         "ioapic entry len %d\n", ent->me_len);
 246                                 error = EINVAL;
 247                         }
 248                         break;
 249
 250                 case MADT_ENT_INTSRC:
 251                         if (ent->me_len < sizeof(struct acpi_madt_intsrc)) {
 252                                 kprintf("madt_iterate_entries: invalid MADT "
 253                                         "intsrc entry len %d\n",
 254                                         ent->me_len);
 255                                 error = EINVAL;
 256                         }
 257                         break;
 258                 }
 259                 if (error)
 260                         break;
 261
 262                 error = func(arg, ent);
 263                 if (error)
 264                         break;
 265         }
 266         return error;
 267 }
 268
 269 static int
 270 madt_lapic_pass1_callback(void *xarg, const struct acpi_madt_ent *ent)
 271 {
 272         const struct acpi_madt_lapic_addr *lapic_addr_ent;
 273         uint64_t *addr64 = xarg;
 274
 275         if (ent->me_type != MADT_ENT_LAPIC_ADDR)
 276                 return 0;
 277         if (ent->me_len < sizeof(*lapic_addr_ent)) {
 278                 kprintf("madt_lapic_pass1: "
 279                         "invalid LAPIC address override length\n");
 280                 return 0;
 281         }
 282         lapic_addr_ent = (const struct acpi_madt_lapic_addr *)ent;
 283
 284         *addr64 = lapic_addr_ent->mla_lapic_addr;
 285         return 0;
 286 }
 287
 288 static vm_paddr_t
 289 madt_lapic_pass1(void)
 290 {
 291         struct acpi_madt *madt;
 292         vm_paddr_t lapic_addr;
 293         uint64_t lapic_addr64;
 294         int error;
 295
 296         KKASSERT(madt_phyaddr != 0);
 297
 298         madt = sdt_sdth_map(madt_phyaddr);
 299         KKASSERT(madt != NULL);
 300
 301         MADT_VPRINTF("LAPIC address 0x%x, flags %#x\n",
 302                      madt->madt_lapic_addr, madt->madt_flags);
 303         lapic_addr = madt->madt_lapic_addr;
 304
 305         lapic_addr64 = 0;
 306         error = madt_iterate_entries(madt, madt_lapic_pass1_callback,
 307                                      &lapic_addr64);
 308         if (error)
 309                 panic("madt_iterate_entries(pass1) failed");
 310
 311         if (lapic_addr64 != 0) {
 312                 kprintf("ACPI MADT: 64bits lapic address 0x%lx\n",
 313                         lapic_addr64);
 314                 lapic_addr = lapic_addr64;
 315         }
 316
 317         sdt_sdth_unmap(&madt->madt_hdr);
 318
 319         return lapic_addr;
 320 }
 321
 322 struct madt_lapic_pass2_cbarg {
 323         int     cpu;
 324         int     bsp_found;
 325         int     bsp_apic_id;
 326 };
 327
 328 static int
 329 madt_lapic_pass2_callback(void *xarg, const struct acpi_madt_ent *ent)
 330 {
 331         const struct acpi_madt_lapic *lapic_ent;
 332         struct madt_lapic_pass2_cbarg *arg = xarg;
 333
 334         if (ent->me_type != MADT_ENT_LAPIC)
 335                 return 0;
 336
 337         lapic_ent = (const struct acpi_madt_lapic *)ent;
 338         if (lapic_ent->ml_flags & MADT_LAPIC_ENABLED) {
 339                 MADT_VPRINTF("cpu id %d, apic id %d\n",
 340                              lapic_ent->ml_cpu_id, lapic_ent->ml_apic_id);
 341                 if (lapic_ent->ml_apic_id == arg->bsp_apic_id) {
 342                         lapic_set_cpuid(0, lapic_ent->ml_apic_id);
 343                         arg->bsp_found = 1;
 344                 } else {
 345                         lapic_set_cpuid(arg->cpu, lapic_ent->ml_apic_id);
 346                         arg->cpu++;
 347                 }
 348         }
 349         return 0;
 350 }
 351
 352 static int
 353 madt_lapic_pass2(int bsp_apic_id)
 354 {
 355         struct acpi_madt *madt;
 356         struct madt_lapic_pass2_cbarg arg;
 357         int error;
 358
 359         MADT_VPRINTF("BSP apic id %d\n", bsp_apic_id);
 360
 361         KKASSERT(madt_phyaddr != 0);
 362
 363         madt = sdt_sdth_map(madt_phyaddr);
 364         KKASSERT(madt != NULL);
 365
 366         bzero(&arg, sizeof(arg));
 367         arg.cpu = 1;
 368         arg.bsp_apic_id = bsp_apic_id;
 369
 370         error = madt_iterate_entries(madt, madt_lapic_pass2_callback, &arg);
 371         if (error)
 372                 panic("madt_iterate_entries(pass2) failed");
 373
 374         KKASSERT(arg.bsp_found);
 375         naps = arg.cpu - 1; /* exclude BSP */
 376
 377         sdt_sdth_unmap(&madt->madt_hdr);
 378
 379         return 0;
 380 }
 381
 382 struct madt_lapic_probe_cbarg {
 383         int             cpu_count;
 384         vm_paddr_t      lapic_addr;
 385 };
 386
 387 static int
 388 madt_lapic_probe_callback(void *xarg, const struct acpi_madt_ent *ent)
 389 {
 390         struct madt_lapic_probe_cbarg *arg = xarg;
 391
 392         if (ent->me_type == MADT_ENT_LAPIC) {
 393                 const struct acpi_madt_lapic *lapic_ent;
 394
 395                 lapic_ent = (const struct acpi_madt_lapic *)ent;
 396                 if (lapic_ent->ml_flags & MADT_LAPIC_ENABLED)
 397                         arg->cpu_count++;
 398                 if (lapic_ent->ml_apic_id == APICID_MAX) {
 399                         kprintf("madt_lapic_probe: "
 400                             "invalid LAPIC apic id %d\n",
 401                             lapic_ent->ml_apic_id);
 402                         return EINVAL;
 403                 }
 404         } else if (ent->me_type == MADT_ENT_LAPIC_ADDR) {
 405                 const struct acpi_madt_lapic_addr *lapic_addr_ent;
 406
 407                 if (ent->me_len < sizeof(*lapic_addr_ent)) {
 408                         kprintf("madt_lapic_probe: "
 409                                 "invalid LAPIC address override length\n");
 410                         return 0;
 411                 }
 412                 lapic_addr_ent = (const struct acpi_madt_lapic_addr *)ent;
 413
 414                 if (lapic_addr_ent->mla_lapic_addr != 0)
 415                         arg->lapic_addr = lapic_addr_ent->mla_lapic_addr;
 416         }
 417         return 0;
 418 }
 419
 420 static int
 421 madt_lapic_probe(struct lapic_enumerator *e)
 422 {
 423         struct madt_lapic_probe_cbarg arg;
 424         struct acpi_madt *madt;
 425         int error;
 426
 427         if (madt_phyaddr == 0)
 428                 return ENXIO;
 429
 430         madt = sdt_sdth_map(madt_phyaddr);
 431         KKASSERT(madt != NULL);
 432
 433         bzero(&arg, sizeof(arg));
 434         arg.lapic_addr = madt->madt_lapic_addr;
 435
 436         error = madt_iterate_entries(madt, madt_lapic_probe_callback, &arg);
 437         if (!error) {
 438                 if (arg.cpu_count == 0) {
 439                         kprintf("madt_lapic_probe: no CPU is found\n");
 440                         error = EOPNOTSUPP;
 441                 }
 442                 if (arg.lapic_addr == 0) {
 443                         kprintf("madt_lapic_probe: zero LAPIC address\n");
 444                         error = EOPNOTSUPP;
 445                 }
 446         }
 447
 448         sdt_sdth_unmap(&madt->madt_hdr);
 449         return error;
 450 }
 451
 452 static int
 453 madt_lapic_enumerate(struct lapic_enumerator *e)
 454 {
 455         vm_paddr_t lapic_addr;
 456         int bsp_apic_id;
 457
 458         KKASSERT(madt_phyaddr != 0);
 459
 460         lapic_addr = madt_lapic_pass1();
 461         if (lapic_addr == 0)
 462                 panic("madt_lapic_enumerate: no local apic");
 463
 464         lapic_map(lapic_addr);
 465
 466         bsp_apic_id = APIC_ID(lapic->id);
 467         if (bsp_apic_id == APICID_MAX) {
 468                 /*
 469                  * XXX
 470                  * Some old brain dead BIOS will set BSP's LAPIC apic id
 471                  * to 255, though all LAPIC entries in MADT are valid.
 472                  */
 473                 kprintf("%s invalid BSP LAPIC apic id %d\n", __func__,
 474                     bsp_apic_id);
 475                 return EINVAL;
 476         }
 477
 478         if (madt_lapic_pass2(bsp_apic_id))
 479                 panic("madt_lapic_enumerate: madt_lapic_pass2 failed");
 480
 481         return 0;
 482 }
 483
 484 static struct lapic_enumerator  madt_lapic_enumerator = {
 485         .lapic_prio = LAPIC_ENUM_PRIO_MADT,
 486         .lapic_probe = madt_lapic_probe,
 487         .lapic_enumerate = madt_lapic_enumerate
 488 };
 489
 490 static void
 491 madt_lapic_enum_register(void)
 492 {
 493         int prio;
 494
 495         prio = LAPIC_ENUM_PRIO_MADT;
 496         kgetenv_int("hw.madt_lapic_prio", &prio);
 497         madt_lapic_enumerator.lapic_prio = prio;
 498
 499         lapic_enumerator_register(&madt_lapic_enumerator);
 500 }
 501 SYSINIT(madt_lapic, SI_BOOT2_PRESMP, SI_ORDER_ANY, madt_lapic_enum_register, 0);
 502
 503 struct madt_ioapic_probe_cbarg {
 504         int     ioapic_cnt;
 505         int     gsi_base0;
 506 };
 507
 508 static int
 509 madt_ioapic_probe_callback(void *xarg, const struct acpi_madt_ent *ent)
 510 {
 511         struct madt_ioapic_probe_cbarg *arg = xarg;
 512
 513         if (ent->me_type == MADT_ENT_INTSRC) {
 514                 const struct acpi_madt_intsrc *intsrc_ent;
 515                 int trig, pola;
 516
 517                 intsrc_ent = (const struct acpi_madt_intsrc *)ent;
 518
 519                 if (intsrc_ent->mint_src >= ISA_IRQ_CNT) {
 520                         kprintf("madt_ioapic_probe: invalid intsrc irq (%d)\n",
 521                                 intsrc_ent->mint_src);
 522                         return EINVAL;
 523                 }
 524
 525                 if (intsrc_ent->mint_bus != MADT_INT_BUS_ISA) {
 526                         kprintf("ACPI MADT: warning intsrc irq %d "
 527                                 "bus is not ISA (%d)\n",
 528                                 intsrc_ent->mint_src, intsrc_ent->mint_bus);
 529                 }
 530
 531                 trig = (intsrc_ent->mint_flags & MADT_INT_TRIG_MASK) >>
 532                        MADT_INT_TRIG_SHIFT;
 533                 if (trig == MADT_INT_TRIG_RSVD) {
 534                         kprintf("ACPI MADT: warning invalid intsrc irq %d "
 535                                 "trig, reserved\n", intsrc_ent->mint_src);
 536                 } else if (trig == MADT_INT_TRIG_LEVEL) {
 537                         MADT_VPRINTF("warning invalid intsrc irq %d "
 538                             "trig, level\n", intsrc_ent->mint_src);
 539                 }
 540
 541                 pola = (intsrc_ent->mint_flags & MADT_INT_POLA_MASK) >>
 542                        MADT_INT_POLA_SHIFT;
 543                 if (pola == MADT_INT_POLA_RSVD) {
 544                         kprintf("ACPI MADT: warning invalid intsrc irq %d "
 545                                 "pola, reserved\n", intsrc_ent->mint_src);
 546                 } else if (pola == MADT_INT_POLA_LOW) {
 547                         MADT_VPRINTF("warning invalid intsrc irq %d "
 548                             "pola, low\n", intsrc_ent->mint_src);
 549                 }
 550         } else if (ent->me_type == MADT_ENT_IOAPIC) {
 551                 const struct acpi_madt_ioapic *ioapic_ent;
 552
 553                 ioapic_ent = (const struct acpi_madt_ioapic *)ent;
 554                 if (ioapic_ent->mio_addr == 0) {
 555                         kprintf("madt_ioapic_probe: zero IOAPIC address\n");
 556                         return EINVAL;
 557                 }
 558                 if (ioapic_ent->mio_apic_id == APICID_MAX) {
 559                         kprintf("madt_ioapic_probe: "
 560                             "invalid IOAPIC apic id %d\n",
 561                             ioapic_ent->mio_apic_id);
 562                         return EINVAL;
 563                 }
 564
 565                 arg->ioapic_cnt++;
 566                 if (ioapic_ent->mio_gsi_base == 0)
 567                         arg->gsi_base0 = 1;
 568         }
 569         return 0;
 570 }
 571
 572 static int
 573 madt_ioapic_probe(struct ioapic_enumerator *e)
 574 {
 575         struct madt_ioapic_probe_cbarg arg;
 576         struct acpi_madt *madt;
 577         int error;
 578
 579         if (madt_phyaddr == 0)
 580                 return ENXIO;
 581
 582         madt = sdt_sdth_map(madt_phyaddr);
 583         KKASSERT(madt != NULL);
 584
 585         bzero(&arg, sizeof(arg));
 586
 587         error = madt_iterate_entries(madt, madt_ioapic_probe_callback, &arg);
 588         if (!error) {
 589                 if (arg.ioapic_cnt == 0) {
 590                         kprintf("madt_ioapic_probe: no IOAPIC\n");
 591                         error = ENXIO;
 592                 }
 593                 if (!arg.gsi_base0) {
 594                         kprintf("madt_ioapic_probe: no GSI base 0\n");
 595                         error = EINVAL;
 596                 }
 597         }
 598
 599         sdt_sdth_unmap(&madt->madt_hdr);
 600         return error;
 601 }
 602
 603 static int
 604 madt_ioapic_enum_callback(void *xarg, const struct acpi_madt_ent *ent)
 605 {
 606         if (ent->me_type == MADT_ENT_INTSRC) {
 607                 const struct acpi_madt_intsrc *intsrc_ent;
 608                 enum intr_trigger trig;
 609                 enum intr_polarity pola;
 610 #ifdef foo
 611                 int ent_trig, ent_pola;
 612 #endif
 613
 614                 intsrc_ent = (const struct acpi_madt_intsrc *)ent;
 615
 616                 KKASSERT(intsrc_ent->mint_src < ISA_IRQ_CNT);
 617                 if (intsrc_ent->mint_bus != MADT_INT_BUS_ISA)
 618                         return 0;
 619
 620 #ifdef foo
 621                 ent_trig = (intsrc_ent->mint_flags & MADT_INT_TRIG_MASK) >>
 622                     MADT_INT_TRIG_SHIFT;
 623                 if (ent_trig == MADT_INT_TRIG_RSVD)
 624                         return 0;
 625                 else if (ent_trig == MADT_INT_TRIG_LEVEL)
 626                         trig = INTR_TRIGGER_LEVEL;
 627                 else
 628                         trig = INTR_TRIGGER_EDGE;
 629
 630                 ent_pola = (intsrc_ent->mint_flags & MADT_INT_POLA_MASK) >>
 631                     MADT_INT_POLA_SHIFT;
 632                 if (ent_pola == MADT_INT_POLA_RSVD)
 633                         return 0;
 634                 else if (ent_pola == MADT_INT_POLA_LOW)
 635                         pola = INTR_POLARITY_LOW;
 636                 else
 637                         pola = INTR_POLARITY_HIGH;
 638 #else
 639                 /*
 640                  * We ignore the polarity and trigger changes, since
 641                  * most of them are wrong or useless at best.
 642                  */
 643                 if (intsrc_ent->mint_src == intsrc_ent->mint_gsi) {
 644                         /* Nothing changed */
 645                         return 0;
 646                 }
 647                 trig = INTR_TRIGGER_EDGE;
 648                 pola = INTR_POLARITY_HIGH;
 649 #endif
 650
 651                 MADT_VPRINTF("INTSRC irq %d -> gsi %u %s/%s\n",
 652                              intsrc_ent->mint_src, intsrc_ent->mint_gsi,
 653                              intr_str_trigger(trig), intr_str_polarity(pola));
 654                 ioapic_intsrc(intsrc_ent->mint_src, intsrc_ent->mint_gsi,
 655                               trig, pola);
 656         } else if (ent->me_type == MADT_ENT_IOAPIC) {
 657                 const struct acpi_madt_ioapic *ioapic_ent;
 658                 uint32_t ver;
 659                 void *addr;
 660                 int npin;
 661
 662                 ioapic_ent = (const struct acpi_madt_ioapic *)ent;
 663                 MADT_VPRINTF("IOAPIC addr 0x%08x, apic id %d, gsi base %u\n",
 664                              ioapic_ent->mio_addr, ioapic_ent->mio_apic_id,
 665                              ioapic_ent->mio_gsi_base);
 666
 667                 addr = ioapic_map(ioapic_ent->mio_addr);
 668
 669                 ver = ioapic_read(addr, IOAPIC_VER);
 670                 npin = ((ver & IOART_VER_MAXREDIR) >> MAXREDIRSHIFT) + 1;
 671
 672                 ioapic_add(addr, ioapic_ent->mio_gsi_base, npin);
 673         }
 674         return 0;
 675 }
 676
 677 static void
 678 madt_ioapic_enumerate(struct ioapic_enumerator *e)
 679 {
 680         struct acpi_madt *madt;
 681         int error;
 682
 683         KKASSERT(madt_phyaddr != 0);
 684
 685         madt = sdt_sdth_map(madt_phyaddr);
 686         KKASSERT(madt != NULL);
 687
 688         error = madt_iterate_entries(madt, madt_ioapic_enum_callback, NULL);
 689         if (error)
 690                 panic("madt_ioapic_enumerate failed");
 691
 692         sdt_sdth_unmap(&madt->madt_hdr);
 693 }
 694
 695 static struct ioapic_enumerator madt_ioapic_enumerator = {
 696         .ioapic_prio = IOAPIC_ENUM_PRIO_MADT,
 697         .ioapic_probe = madt_ioapic_probe,
 698         .ioapic_enumerate = madt_ioapic_enumerate
 699 };
 700
 701 static void
 702 madt_ioapic_enum_register(void)
 703 {
 704         int prio;
 705
 706         prio = IOAPIC_ENUM_PRIO_MADT;
 707         kgetenv_int("hw.madt_ioapic_prio", &prio);
 708         madt_ioapic_enumerator.ioapic_prio = prio;
 709
 710         ioapic_enumerator_register(&madt_ioapic_enumerator);
 711 }
 712 SYSINIT(madt_ioapic, SI_BOOT2_PRESMP, SI_ORDER_ANY,
 713         madt_ioapic_enum_register, 0);