drivers/acpi/tables.c

   1 /*
   2  *  acpi_tables.c - ACPI Boot-Time Table Parsing
   3  *
   4  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/sched.h>
  29 #include <linux/smp.h>
  30 #include <linux/string.h>
  31 #include <linux/types.h>
  32 #include <linux/irq.h>
  33 #include <linux/errno.h>
  34 #include <linux/acpi.h>
  35 #include <linux/bootmem.h>
  36
  37 #define PREFIX                  "ACPI: "
  38
  39 #define ACPI_MAX_TABLES         128
  40
  41 static char *acpi_table_signatures[ACPI_TABLE_COUNT] = {
  42         [ACPI_TABLE_UNKNOWN] = "????",
  43         [ACPI_APIC] = "APIC",
  44         [ACPI_BOOT] = "BOOT",
  45         [ACPI_DBGP] = "DBGP",
  46         [ACPI_DSDT] = "DSDT",
  47         [ACPI_ECDT] = "ECDT",
  48         [ACPI_ETDT] = "ETDT",
  49         [ACPI_FADT] = "FACP",
  50         [ACPI_FACS] = "FACS",
  51         [ACPI_OEMX] = "OEM",
  52         [ACPI_PSDT] = "PSDT",
  53         [ACPI_SBST] = "SBST",
  54         [ACPI_SLIT] = "SLIT",
  55         [ACPI_SPCR] = "SPCR",
  56         [ACPI_SRAT] = "SRAT",
  57         [ACPI_SSDT] = "SSDT",
  58         [ACPI_SPMI] = "SPMI",
  59         [ACPI_HPET] = "HPET",
  60         [ACPI_MCFG] = "MCFG",
  61 };
  62
  63 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
  64 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
  65
  66 /* System Description Table (RSDT/XSDT) */
  67 struct acpi_table_sdt {
  68         unsigned long pa;
  69         enum acpi_table_id id;
  70         unsigned long size;
  71 } __attribute__ ((packed));
  72
  73 static unsigned long sdt_pa;    /* Physical Address */
  74 static unsigned long sdt_count; /* Table count */
  75
  76 static struct acpi_table_sdt sdt_entry[ACPI_MAX_TABLES] __initdata;
  77 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
  78
  79 void acpi_table_print(struct acpi_table_header *header, unsigned long phys_addr)
  80 {
  81         char *name = NULL;
  82
  83         if (!header)
  84                 return;
  85
  86         /* Some table signatures aren't good table names */
  87
  88         if (!strncmp((char *)&header->signature,
  89                      acpi_table_signatures[ACPI_APIC],
  90                      sizeof(header->signature))) {
  91                 name = "MADT";
  92         } else if (!strncmp((char *)&header->signature,
  93                             acpi_table_signatures[ACPI_FADT],
  94                             sizeof(header->signature))) {
  95                 name = "FADT";
  96         } else
  97                 name = header->signature;
  98
  99         printk(KERN_DEBUG PREFIX
 100                "%.4s (v%3.3d %6.6s %8.8s 0x%08x %.4s 0x%08x) @ 0x%p\n", name,
 101                header->revision, header->oem_id, header->oem_table_id,
 102                header->oem_revision, header->asl_compiler_id,
 103                header->asl_compiler_revision, (void *)phys_addr);
 104 }
 105
 106 void acpi_table_print_madt_entry(acpi_table_entry_header * header)
 107 {
 108         if (!header)
 109                 return;
 110
 111         switch (header->type) {
 112
 113         case ACPI_MADT_LAPIC:
 114                 {
 115                         struct acpi_table_lapic *p =
 116                             (struct acpi_table_lapic *)header;
 117                         printk(KERN_INFO PREFIX
 118                                "LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
 119                                p->acpi_id, p->id,
 120                                p->flags.enabled ? "enabled" : "disabled");
 121                 }
 122                 break;
 123
 124         case ACPI_MADT_IOAPIC:
 125                 {
 126                         struct acpi_table_ioapic *p =
 127                             (struct acpi_table_ioapic *)header;
 128                         printk(KERN_INFO PREFIX
 129                                "IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
 130                                p->id, p->address, p->global_irq_base);
 131                 }
 132                 break;
 133
 134         case ACPI_MADT_INT_SRC_OVR:
 135                 {
 136                         struct acpi_table_int_src_ovr *p =
 137                             (struct acpi_table_int_src_ovr *)header;
 138                         printk(KERN_INFO PREFIX
 139                                "INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
 140                                p->bus, p->bus_irq, p->global_irq,
 141                                mps_inti_flags_polarity[p->flags.polarity],
 142                                mps_inti_flags_trigger[p->flags.trigger]);
 143                         if (p->flags.reserved)
 144                                 printk(KERN_INFO PREFIX
 145                                        "INT_SRC_OVR unexpected reserved flags: 0x%x\n",
 146                                        p->flags.reserved);
 147
 148                 }
 149                 break;
 150
 151         case ACPI_MADT_NMI_SRC:
 152                 {
 153                         struct acpi_table_nmi_src *p =
 154                             (struct acpi_table_nmi_src *)header;
 155                         printk(KERN_INFO PREFIX
 156                                "NMI_SRC (%s %s global_irq %d)\n",
 157                                mps_inti_flags_polarity[p->flags.polarity],
 158                                mps_inti_flags_trigger[p->flags.trigger],
 159                                p->global_irq);
 160                 }
 161                 break;
 162
 163         case ACPI_MADT_LAPIC_NMI:
 164                 {
 165                         struct acpi_table_lapic_nmi *p =
 166                             (struct acpi_table_lapic_nmi *)header;
 167                         printk(KERN_INFO PREFIX
 168                                "LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 169                                p->acpi_id,
 170                                mps_inti_flags_polarity[p->flags.polarity],
 171                                mps_inti_flags_trigger[p->flags.trigger],
 172                                p->lint);
 173                 }
 174                 break;
 175
 176         case ACPI_MADT_LAPIC_ADDR_OVR:
 177                 {
 178                         struct acpi_table_lapic_addr_ovr *p =
 179                             (struct acpi_table_lapic_addr_ovr *)header;
 180                         printk(KERN_INFO PREFIX
 181                                "LAPIC_ADDR_OVR (address[%p])\n",
 182                                (void *)(unsigned long)p->address);
 183                 }
 184                 break;
 185
 186         case ACPI_MADT_IOSAPIC:
 187                 {
 188                         struct acpi_table_iosapic *p =
 189                             (struct acpi_table_iosapic *)header;
 190                         printk(KERN_INFO PREFIX
 191                                "IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 192                                p->id, (void *)(unsigned long)p->address,
 193                                p->global_irq_base);
 194                 }
 195                 break;
 196
 197         case ACPI_MADT_LSAPIC:
 198                 {
 199                         struct acpi_table_lsapic *p =
 200                             (struct acpi_table_lsapic *)header;
 201                         printk(KERN_INFO PREFIX
 202                                "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 203                                p->acpi_id, p->id, p->eid,
 204                                p->flags.enabled ? "enabled" : "disabled");
 205                 }
 206                 break;
 207
 208         case ACPI_MADT_PLAT_INT_SRC:
 209                 {
 210                         struct acpi_table_plat_int_src *p =
 211                             (struct acpi_table_plat_int_src *)header;
 212                         printk(KERN_INFO PREFIX
 213                                "PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
 214                                mps_inti_flags_polarity[p->flags.polarity],
 215                                mps_inti_flags_trigger[p->flags.trigger],
 216                                p->type, p->id, p->eid, p->iosapic_vector,
 217                                p->global_irq);
 218                 }
 219                 break;
 220
 221         default:
 222                 printk(KERN_WARNING PREFIX
 223                        "Found unsupported MADT entry (type = 0x%x)\n",
 224                        header->type);
 225                 break;
 226         }
 227 }
 228
 229 static int
 230 acpi_table_compute_checksum(void *table_pointer, unsigned long length)
 231 {
 232         u8 *p = table_pointer;
 233         unsigned long remains = length;
 234         unsigned long sum = 0;
 235
 236         if (!p || !length)
 237                 return -EINVAL;
 238
 239         while (remains--)
 240                 sum += *p++;
 241
 242         return (sum & 0xFF);
 243 }
 244
 245 /*
 246  * acpi_get_table_header_early()
 247  * for acpi_blacklisted(), acpi_table_get_sdt()
 248  */
 249 int __init
 250 acpi_get_table_header_early(enum acpi_table_id id,
 251                             struct acpi_table_header **header)
 252 {
 253         unsigned int i;
 254         enum acpi_table_id temp_id;
 255
 256         /* DSDT is different from the rest */
 257         if (id == ACPI_DSDT)
 258                 temp_id = ACPI_FADT;
 259         else
 260                 temp_id = id;
 261
 262         /* Locate the table. */
 263
 264         for (i = 0; i < sdt_count; i++) {
 265                 if (sdt_entry[i].id != temp_id)
 266                         continue;
 267                 *header = (void *)
 268                     __acpi_map_table(sdt_entry[i].pa, sdt_entry[i].size);
 269                 if (!*header) {
 270                         printk(KERN_WARNING PREFIX "Unable to map %s\n",
 271                                acpi_table_signatures[temp_id]);
 272                         return -ENODEV;
 273                 }
 274                 break;
 275         }
 276
 277         if (!*header) {
 278                 printk(KERN_WARNING PREFIX "%s not present\n",
 279                        acpi_table_signatures[id]);
 280                 return -ENODEV;
 281         }
 282
 283         /* Map the DSDT header via the pointer in the FADT */
 284         if (id == ACPI_DSDT) {
 285                 struct fadt_descriptor *fadt =
 286                     (struct fadt_descriptor *)*header;
 287
 288                 if (fadt->header.revision == 3 && fadt->Xdsdt) {
 289                         *header = (void *)__acpi_map_table(fadt->Xdsdt,
 290                                                            sizeof(struct
 291                                                                   acpi_table_header));
 292                 } else if (fadt->dsdt) {
 293                         *header = (void *)__acpi_map_table(fadt->dsdt,
 294                                                            sizeof(struct
 295                                                                   acpi_table_header));
 296                 } else
 297                         *header = NULL;
 298
 299                 if (!*header) {
 300                         printk(KERN_WARNING PREFIX "Unable to map DSDT\n");
 301                         return -ENODEV;
 302                 }
 303         }
 304
 305         return 0;
 306 }
 307
 308 int __init
 309 acpi_table_parse_madt_family(enum acpi_table_id id,
 310                              unsigned long madt_size,
 311                              int entry_id,
 312                              acpi_madt_entry_handler handler,
 313                              unsigned int max_entries)
 314 {
 315         void *madt = NULL;
 316         acpi_table_entry_header *entry;
 317         unsigned int count = 0;
 318         unsigned long madt_end;
 319         unsigned int i;
 320
 321         if (!handler)
 322                 return -EINVAL;
 323
 324         /* Locate the MADT (if exists). There should only be one. */
 325
 326         for (i = 0; i < sdt_count; i++) {
 327                 if (sdt_entry[i].id != id)
 328                         continue;
 329                 madt = (void *)
 330                     __acpi_map_table(sdt_entry[i].pa, sdt_entry[i].size);
 331                 if (!madt) {
 332                         printk(KERN_WARNING PREFIX "Unable to map %s\n",
 333                                acpi_table_signatures[id]);
 334                         return -ENODEV;
 335                 }
 336                 break;
 337         }
 338
 339         if (!madt) {
 340                 printk(KERN_WARNING PREFIX "%s not present\n",
 341                        acpi_table_signatures[id]);
 342                 return -ENODEV;
 343         }
 344
 345         madt_end = (unsigned long)madt + sdt_entry[i].size;
 346
 347         /* Parse all entries looking for a match. */
 348
 349         entry = (acpi_table_entry_header *)
 350             ((unsigned long)madt + madt_size);
 351
 352         while (((unsigned long)entry) + sizeof(acpi_table_entry_header) <
 353                madt_end) {
 354                 if (entry->type == entry_id
 355                     && (!max_entries || count++ < max_entries))
 356                         if (handler(entry, madt_end))
 357                                 return -EINVAL;
 358
 359                 entry = (acpi_table_entry_header *)
 360                     ((unsigned long)entry + entry->length);
 361         }
 362         if (max_entries && count > max_entries) {
 363                 printk(KERN_WARNING PREFIX "[%s:0x%02x] ignored %i entries of "
 364                        "%i found\n", acpi_table_signatures[id], entry_id,
 365                        count - max_entries, count);
 366         }
 367
 368         return count;
 369 }
 370
 371 int __init
 372 acpi_table_parse_madt(enum acpi_madt_entry_id id,
 373                       acpi_madt_entry_handler handler, unsigned int max_entries)
 374 {
 375         return acpi_table_parse_madt_family(ACPI_APIC,
 376                                             sizeof(struct acpi_table_madt), id,
 377                                             handler, max_entries);
 378 }
 379
 380 int __init acpi_table_parse(enum acpi_table_id id, acpi_table_handler handler)
 381 {
 382         int count = 0;
 383         unsigned int i = 0;
 384
 385         if (!handler)
 386                 return -EINVAL;
 387
 388         for (i = 0; i < sdt_count; i++) {
 389                 if (sdt_entry[i].id != id)
 390                         continue;
 391                 count++;
 392                 if (count == 1)
 393                         handler(sdt_entry[i].pa, sdt_entry[i].size);
 394
 395                 else
 396                         printk(KERN_WARNING PREFIX
 397                                "%d duplicate %s table ignored.\n", count,
 398                                acpi_table_signatures[id]);
 399         }
 400
 401         return count;
 402 }
 403
 404 static int __init acpi_table_get_sdt(struct acpi_table_rsdp *rsdp)
 405 {
 406         struct acpi_table_header *header = NULL;
 407         unsigned int i, id = 0;
 408
 409         if (!rsdp)
 410                 return -EINVAL;
 411
 412         /* First check XSDT (but only on ACPI 2.0-compatible systems) */
 413
 414         if ((rsdp->revision >= 2) && rsdp->xsdt_physical_address) {
 415
 416                 struct acpi_table_xsdt *mapped_xsdt = NULL;
 417
 418                 sdt_pa = rsdp->xsdt_physical_address;
 419
 420                 /* map in just the header */
 421                 header = (struct acpi_table_header *)
 422                     __acpi_map_table(sdt_pa, sizeof(struct acpi_table_header));
 423
 424                 if (!header) {
 425                         printk(KERN_WARNING PREFIX
 426                                "Unable to map XSDT header\n");
 427                         return -ENODEV;
 428                 }
 429
 430                 /* remap in the entire table before processing */
 431                 mapped_xsdt = (struct acpi_table_xsdt *)
 432                     __acpi_map_table(sdt_pa, header->length);
 433                 if (!mapped_xsdt) {
 434                         printk(KERN_WARNING PREFIX "Unable to map XSDT\n");
 435                         return -ENODEV;
 436                 }
 437                 header = &mapped_xsdt->header;
 438
 439                 if (strncmp(header->signature, "XSDT", 4)) {
 440                         printk(KERN_WARNING PREFIX
 441                                "XSDT signature incorrect\n");
 442                         return -ENODEV;
 443                 }
 444
 445                 if (acpi_table_compute_checksum(header, header->length)) {
 446                         printk(KERN_WARNING PREFIX "Invalid XSDT checksum\n");
 447                         return -ENODEV;
 448                 }
 449
 450                 sdt_count =
 451                     (header->length - sizeof(struct acpi_table_header)) >> 3;
 452                 if (sdt_count > ACPI_MAX_TABLES) {
 453                         printk(KERN_WARNING PREFIX
 454                                "Truncated %lu XSDT entries\n",
 455                                (sdt_count - ACPI_MAX_TABLES));
 456                         sdt_count = ACPI_MAX_TABLES;
 457                 }
 458
 459                 for (i = 0; i < sdt_count; i++)
 460                         sdt_entry[i].pa = (unsigned long)mapped_xsdt->table_offset_entry[i];
 461         }
 462
 463         /* Then check RSDT */
 464
 465         else if (rsdp->rsdt_physical_address) {
 466
 467                 struct acpi_table_rsdt *mapped_rsdt = NULL;
 468
 469                 sdt_pa = rsdp->rsdt_physical_address;
 470
 471                 /* map in just the header */
 472                 header = (struct acpi_table_header *)
 473                     __acpi_map_table(sdt_pa, sizeof(struct acpi_table_header));
 474                 if (!header) {
 475                         printk(KERN_WARNING PREFIX
 476                                "Unable to map RSDT header\n");
 477                         return -ENODEV;
 478                 }
 479
 480                 /* remap in the entire table before processing */
 481                 mapped_rsdt = (struct acpi_table_rsdt *)
 482                     __acpi_map_table(sdt_pa, header->length);
 483                 if (!mapped_rsdt) {
 484                         printk(KERN_WARNING PREFIX "Unable to map RSDT\n");
 485                         return -ENODEV;
 486                 }
 487                 header = &mapped_rsdt->header;
 488
 489                 if (strncmp(header->signature, "RSDT", 4)) {
 490                         printk(KERN_WARNING PREFIX
 491                                "RSDT signature incorrect\n");
 492                         return -ENODEV;
 493                 }
 494
 495                 if (acpi_table_compute_checksum(header, header->length)) {
 496                         printk(KERN_WARNING PREFIX "Invalid RSDT checksum\n");
 497                         return -ENODEV;
 498                 }
 499
 500                 sdt_count =
 501                     (header->length - sizeof(struct acpi_table_header)) >> 2;
 502                 if (sdt_count > ACPI_MAX_TABLES) {
 503                         printk(KERN_WARNING PREFIX
 504                                "Truncated %lu RSDT entries\n",
 505                                (sdt_count - ACPI_MAX_TABLES));
 506                         sdt_count = ACPI_MAX_TABLES;
 507                 }
 508
 509                 for (i = 0; i < sdt_count; i++)
 510                         sdt_entry[i].pa = (unsigned long)mapped_rsdt->table_offset_entry[i];
 511         }
 512
 513         else {
 514                 printk(KERN_WARNING PREFIX
 515                        "No System Description Table (RSDT/XSDT) specified in RSDP\n");
 516                 return -ENODEV;
 517         }
 518
 519         acpi_table_print(header, sdt_pa);
 520
 521         for (i = 0; i < sdt_count; i++) {
 522
 523                 /* map in just the header */
 524                 header = (struct acpi_table_header *)
 525                     __acpi_map_table(sdt_entry[i].pa,
 526                                      sizeof(struct acpi_table_header));
 527                 if (!header)
 528                         continue;
 529
 530                 /* remap in the entire table before processing */
 531                 header = (struct acpi_table_header *)
 532                     __acpi_map_table(sdt_entry[i].pa, header->length);
 533                 if (!header)
 534                         continue;
 535
 536                 acpi_table_print(header, sdt_entry[i].pa);
 537
 538                 if (acpi_table_compute_checksum(header, header->length)) {
 539                         printk(KERN_WARNING "  >>> ERROR: Invalid checksum\n");
 540                         continue;
 541                 }
 542
 543                 sdt_entry[i].size = header->length;
 544
 545                 for (id = 0; id < ACPI_TABLE_COUNT; id++) {
 546                         if (!strncmp((char *)&header->signature,
 547                                      acpi_table_signatures[id],
 548                                      sizeof(header->signature))) {
 549                                 sdt_entry[i].id = id;
 550                         }
 551                 }
 552         }
 553
 554         /*
 555          * The DSDT is *not* in the RSDT (why not? no idea.) but we want
 556          * to print its info, because this is what people usually blacklist
 557          * against. Unfortunately, we don't know the phys_addr, so just
 558          * print 0. Maybe no one will notice.
 559          */
 560         if (!acpi_get_table_header_early(ACPI_DSDT, &header))
 561                 acpi_table_print(header, 0);
 562
 563         return 0;
 564 }
 565
 566 /*
 567  * acpi_table_init()
 568  *
 569  * find RSDP, find and checksum SDT/XSDT.
 570  * checksum all tables, print SDT/XSDT
 571  *
 572  * result: sdt_entry[] is initialized
 573  */
 574
 575 int __init acpi_table_init(void)
 576 {
 577         struct acpi_table_rsdp *rsdp = NULL;
 578         unsigned long rsdp_phys = 0;
 579         int result = 0;
 580
 581         /* Locate and map the Root System Description Table (RSDP) */
 582
 583         rsdp_phys = acpi_find_rsdp();
 584         if (!rsdp_phys) {
 585                 printk(KERN_ERR PREFIX "Unable to locate RSDP\n");
 586                 return -ENODEV;
 587         }
 588
 589         rsdp = (struct acpi_table_rsdp *)__acpi_map_table(rsdp_phys,
 590                 sizeof(struct acpi_table_rsdp));
 591         if (!rsdp) {
 592                 printk(KERN_WARNING PREFIX "Unable to map RSDP\n");
 593                 return -ENODEV;
 594         }
 595
 596         printk(KERN_DEBUG PREFIX
 597                "RSDP (v%3.3d %6.6s                                ) @ 0x%p\n",
 598                rsdp->revision, rsdp->oem_id, (void *)rsdp_phys);
 599
 600         if (rsdp->revision < 2)
 601                 result =
 602                     acpi_table_compute_checksum(rsdp, ACPI_RSDP_REV0_SIZE);
 603         else
 604                 result =
 605                     acpi_table_compute_checksum(rsdp, rsdp->length);
 606
 607         if (result) {
 608                 printk(KERN_WARNING "  >>> ERROR: Invalid checksum\n");
 609                 return -ENODEV;
 610         }
 611
 612         /* Locate and map the System Description table (RSDT/XSDT) */
 613
 614         if (acpi_table_get_sdt(rsdp))
 615                 return -ENODEV;
 616
 617         acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 618
 619         return 0;
 620 }