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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19  *
  20  */
  21
  22 /* Uncomment next line to get verbose printout */
  23 /* #define DEBUG */
  24 #define pr_fmt(fmt) "ACPI: " fmt
  25
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/smp.h>
  29 #include <linux/string.h>
  30 #include <linux/types.h>
  31 #include <linux/irq.h>
  32 #include <linux/errno.h>
  33 #include <linux/acpi.h>
  34 #include <linux/memblock.h>
  35 #include <linux/earlycpio.h>
  36 #include <linux/initrd.h>
  37 #include "internal.h"
  38
  39 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  40 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  41 #endif
  42
  43 #define ACPI_MAX_TABLES         128
  44
  45 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
  46 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
  47
  48 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
  49
  50 static int acpi_apic_instance __initdata;
  51
  52 /*
  53  * Disable table checksum verification for the early stage due to the size
  54  * limitation of the current x86 early mapping implementation.
  55  */
  56 static bool acpi_verify_table_checksum __initdata = false;
  57
  58 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
  59 {
  60         if (!header)
  61                 return;
  62
  63         switch (header->type) {
  64
  65         case ACPI_MADT_TYPE_LOCAL_APIC:
  66                 {
  67                         struct acpi_madt_local_apic *p =
  68                             (struct acpi_madt_local_apic *)header;
  69                         pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
  70                                  p->processor_id, p->id,
  71                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  72                 }
  73                 break;
  74
  75         case ACPI_MADT_TYPE_LOCAL_X2APIC:
  76                 {
  77                         struct acpi_madt_local_x2apic *p =
  78                             (struct acpi_madt_local_x2apic *)header;
  79                         pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
  80                                  p->local_apic_id, p->uid,
  81                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  82                 }
  83                 break;
  84
  85         case ACPI_MADT_TYPE_IO_APIC:
  86                 {
  87                         struct acpi_madt_io_apic *p =
  88                             (struct acpi_madt_io_apic *)header;
  89                         pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
  90                                  p->id, p->address, p->global_irq_base);
  91                 }
  92                 break;
  93
  94         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  95                 {
  96                         struct acpi_madt_interrupt_override *p =
  97                             (struct acpi_madt_interrupt_override *)header;
  98                         pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
  99                                 p->bus, p->source_irq, p->global_irq,
 100                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 101                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
 102                         if (p->inti_flags  &
 103                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
 104                                 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
 105                                         p->inti_flags  &
 106                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
 107                 }
 108                 break;
 109
 110         case ACPI_MADT_TYPE_NMI_SOURCE:
 111                 {
 112                         struct acpi_madt_nmi_source *p =
 113                             (struct acpi_madt_nmi_source *)header;
 114                         pr_info("NMI_SRC (%s %s global_irq %d)\n",
 115                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 116                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 117                                 p->global_irq);
 118                 }
 119                 break;
 120
 121         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 122                 {
 123                         struct acpi_madt_local_apic_nmi *p =
 124                             (struct acpi_madt_local_apic_nmi *)header;
 125                         pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 126                                 p->processor_id,
 127                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
 128                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 129                                 p->lint);
 130                 }
 131                 break;
 132
 133         case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
 134                 {
 135                         u16 polarity, trigger;
 136                         struct acpi_madt_local_x2apic_nmi *p =
 137                             (struct acpi_madt_local_x2apic_nmi *)header;
 138
 139                         polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
 140                         trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 141
 142                         pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
 143                                 p->uid,
 144                                 mps_inti_flags_polarity[polarity],
 145                                 mps_inti_flags_trigger[trigger],
 146                                 p->lint);
 147                 }
 148                 break;
 149
 150         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 151                 {
 152                         struct acpi_madt_local_apic_override *p =
 153                             (struct acpi_madt_local_apic_override *)header;
 154                         pr_info("LAPIC_ADDR_OVR (address[%p])\n",
 155                                 (void *)(unsigned long)p->address);
 156                 }
 157                 break;
 158
 159         case ACPI_MADT_TYPE_IO_SAPIC:
 160                 {
 161                         struct acpi_madt_io_sapic *p =
 162                             (struct acpi_madt_io_sapic *)header;
 163                         pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 164                                  p->id, (void *)(unsigned long)p->address,
 165                                  p->global_irq_base);
 166                 }
 167                 break;
 168
 169         case ACPI_MADT_TYPE_LOCAL_SAPIC:
 170                 {
 171                         struct acpi_madt_local_sapic *p =
 172                             (struct acpi_madt_local_sapic *)header;
 173                         pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 174                                  p->processor_id, p->id, p->eid,
 175                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 176                 }
 177                 break;
 178
 179         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
 180                 {
 181                         struct acpi_madt_interrupt_source *p =
 182                             (struct acpi_madt_interrupt_source *)header;
 183                         pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
 184                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 185                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 186                                 p->type, p->id, p->eid, p->io_sapic_vector,
 187                                 p->global_irq);
 188                 }
 189                 break;
 190
 191         case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
 192                 {
 193                         struct acpi_madt_generic_interrupt *p =
 194                                 (struct acpi_madt_generic_interrupt *)header;
 195                         pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
 196                                  p->uid, p->base_address,
 197                                  p->arm_mpidr,
 198                                  (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 199
 200                 }
 201                 break;
 202
 203         case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
 204                 {
 205                         struct acpi_madt_generic_distributor *p =
 206                                 (struct acpi_madt_generic_distributor *)header;
 207                         pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
 208                                  p->gic_id, p->base_address,
 209                                  p->global_irq_base);
 210                 }
 211                 break;
 212
 213         default:
 214                 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
 215                         header->type);
 216                 break;
 217         }
 218 }
 219
 220 /**
 221  * acpi_parse_entries_array - for each proc_num find a suitable subtable
 222  *
 223  * @id: table id (for debugging purposes)
 224  * @table_size: size of the root table
 225  * @table_header: where does the table start?
 226  * @proc: array of acpi_subtable_proc struct containing entry id
 227  *        and associated handler with it
 228  * @proc_num: how big proc is?
 229  * @max_entries: how many entries can we process?
 230  *
 231  * For each proc_num find a subtable with proc->id and run proc->handler
 232  * on it. Assumption is that there's only single handler for particular
 233  * entry id.
 234  *
 235  * The table_size is not the size of the complete ACPI table (the length
 236  * field in the header struct), but only the size of the root table; i.e.,
 237  * the offset from the very first byte of the complete ACPI table, to the
 238  * first byte of the very first subtable.
 239  *
 240  * On success returns sum of all matching entries for all proc handlers.
 241  * Otherwise, -ENODEV or -EINVAL is returned.
 242  */
 243 static int __init
 244 acpi_parse_entries_array(char *id, unsigned long table_size,
 245                 struct acpi_table_header *table_header,
 246                 struct acpi_subtable_proc *proc, int proc_num,
 247                 unsigned int max_entries)
 248 {
 249         struct acpi_subtable_header *entry;
 250         unsigned long table_end;
 251         int count = 0;
 252         int errs = 0;
 253         int i;
 254
 255         if (acpi_disabled)
 256                 return -ENODEV;
 257
 258         if (!id)
 259                 return -EINVAL;
 260
 261         if (!table_size)
 262                 return -EINVAL;
 263
 264         if (!table_header) {
 265                 pr_warn("%4.4s not present\n", id);
 266                 return -ENODEV;
 267         }
 268
 269         table_end = (unsigned long)table_header + table_header->length;
 270
 271         /* Parse all entries looking for a match. */
 272
 273         entry = (struct acpi_subtable_header *)
 274             ((unsigned long)table_header + table_size);
 275
 276         while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
 277                table_end) {
 278                 if (max_entries && count >= max_entries)
 279                         break;
 280
 281                 for (i = 0; i < proc_num; i++) {
 282                         if (entry->type != proc[i].id)
 283                                 continue;
 284                         if (!proc[i].handler ||
 285                              (!errs && proc[i].handler(entry, table_end))) {
 286                                 errs++;
 287                                 continue;
 288                         }
 289
 290                         proc[i].count++;
 291                         break;
 292                 }
 293                 if (i != proc_num)
 294                         count++;
 295
 296                 /*
 297                  * If entry->length is 0, break from this loop to avoid
 298                  * infinite loop.
 299                  */
 300                 if (entry->length == 0) {
 301                         pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
 302                         return -EINVAL;
 303                 }
 304
 305                 entry = (struct acpi_subtable_header *)
 306                     ((unsigned long)entry + entry->length);
 307         }
 308
 309         if (max_entries && count > max_entries) {
 310                 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
 311                         id, proc->id, count);
 312         }
 313
 314         return errs ? -EINVAL : count;
 315 }
 316
 317 int __init
 318 acpi_table_parse_entries_array(char *id,
 319                          unsigned long table_size,
 320                          struct acpi_subtable_proc *proc, int proc_num,
 321                          unsigned int max_entries)
 322 {
 323         struct acpi_table_header *table_header = NULL;
 324         int count;
 325         u32 instance = 0;
 326
 327         if (acpi_disabled)
 328                 return -ENODEV;
 329
 330         if (!id)
 331                 return -EINVAL;
 332
 333         if (!strncmp(id, ACPI_SIG_MADT, 4))
 334                 instance = acpi_apic_instance;
 335
 336         acpi_get_table(id, instance, &table_header);
 337         if (!table_header) {
 338                 pr_warn("%4.4s not present\n", id);
 339                 return -ENODEV;
 340         }
 341
 342         count = acpi_parse_entries_array(id, table_size, table_header,
 343                         proc, proc_num, max_entries);
 344
 345         acpi_put_table(table_header);
 346         return count;
 347 }
 348
 349 int __init
 350 acpi_table_parse_entries(char *id,
 351                         unsigned long table_size,
 352                         int entry_id,
 353                         acpi_tbl_entry_handler handler,
 354                         unsigned int max_entries)
 355 {
 356         struct acpi_subtable_proc proc = {
 357                 .id             = entry_id,
 358                 .handler        = handler,
 359         };
 360
 361         return acpi_table_parse_entries_array(id, table_size, &proc, 1,
 362                                                 max_entries);
 363 }
 364
 365 int __init
 366 acpi_table_parse_madt(enum acpi_madt_type id,
 367                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 368 {
 369         return acpi_table_parse_entries(ACPI_SIG_MADT,
 370                                             sizeof(struct acpi_table_madt), id,
 371                                             handler, max_entries);
 372 }
 373
 374 /**
 375  * acpi_table_parse - find table with @id, run @handler on it
 376  * @id: table id to find
 377  * @handler: handler to run
 378  *
 379  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 380  * run @handler on it.
 381  *
 382  * Return 0 if table found, -errno if not.
 383  */
 384 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
 385 {
 386         struct acpi_table_header *table = NULL;
 387
 388         if (acpi_disabled)
 389                 return -ENODEV;
 390
 391         if (!id || !handler)
 392                 return -EINVAL;
 393
 394         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
 395                 acpi_get_table(id, acpi_apic_instance, &table);
 396         else
 397                 acpi_get_table(id, 0, &table);
 398
 399         if (table) {
 400                 handler(table);
 401                 acpi_put_table(table);
 402                 return 0;
 403         } else
 404                 return -ENODEV;
 405 }
 406
 407 /*
 408  * The BIOS is supposed to supply a single APIC/MADT,
 409  * but some report two.  Provide a knob to use either.
 410  * (don't you wish instance 0 and 1 were not the same?)
 411  */
 412 static void __init check_multiple_madt(void)
 413 {
 414         struct acpi_table_header *table = NULL;
 415
 416         acpi_get_table(ACPI_SIG_MADT, 2, &table);
 417         if (table) {
 418                 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
 419                         acpi_apic_instance);
 420                 pr_warn("If \"acpi_apic_instance=%d\" works better, "
 421                         "notify linux-acpi@vger.kernel.org\n",
 422                         acpi_apic_instance ? 0 : 2);
 423                 acpi_put_table(table);
 424
 425         } else
 426                 acpi_apic_instance = 0;
 427
 428         return;
 429 }
 430
 431 static void acpi_table_taint(struct acpi_table_header *table)
 432 {
 433         pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 434                 table->signature, table->oem_table_id);
 435         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 436 }
 437
 438 #ifdef CONFIG_ACPI_TABLE_UPGRADE
 439 static u64 acpi_tables_addr;
 440 static int all_tables_size;
 441
 442 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 443 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 444 {
 445         u8 sum = 0;
 446         u8 *end = buffer + length;
 447
 448         while (buffer < end)
 449                 sum = (u8) (sum + *(buffer++));
 450         return sum;
 451 }
 452
 453 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 454 static const char * const table_sigs[] = {
 455         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 456         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 457         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 458         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 459         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 460         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 461         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 462         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 463         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT,
 464         ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, NULL };
 465
 466 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 467
 468 #define NR_ACPI_INITRD_TABLES 64
 469 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
 470 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
 471
 472 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 473
 474 void __init acpi_table_upgrade(void)
 475 {
 476         void *data = (void *)initrd_start;
 477         size_t size = initrd_end - initrd_start;
 478         int sig, no, table_nr = 0, total_offset = 0;
 479         long offset = 0;
 480         struct acpi_table_header *table;
 481         char cpio_path[32] = "kernel/firmware/acpi/";
 482         struct cpio_data file;
 483
 484         if (data == NULL || size == 0)
 485                 return;
 486
 487         for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
 488                 file = find_cpio_data(cpio_path, data, size, &offset);
 489                 if (!file.data)
 490                         break;
 491
 492                 data += offset;
 493                 size -= offset;
 494
 495                 if (file.size < sizeof(struct acpi_table_header)) {
 496                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 497                                 cpio_path, file.name);
 498                         continue;
 499                 }
 500
 501                 table = file.data;
 502
 503                 for (sig = 0; table_sigs[sig]; sig++)
 504                         if (!memcmp(table->signature, table_sigs[sig], 4))
 505                                 break;
 506
 507                 if (!table_sigs[sig]) {
 508                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 509                                 cpio_path, file.name);
 510                         continue;
 511                 }
 512                 if (file.size != table->length) {
 513                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 514                                 cpio_path, file.name);
 515                         continue;
 516                 }
 517                 if (acpi_table_checksum(file.data, table->length)) {
 518                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 519                                 cpio_path, file.name);
 520                         continue;
 521                 }
 522
 523                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 524                         table->signature, cpio_path, file.name, table->length);
 525
 526                 all_tables_size += table->length;
 527                 acpi_initrd_files[table_nr].data = file.data;
 528                 acpi_initrd_files[table_nr].size = file.size;
 529                 table_nr++;
 530         }
 531         if (table_nr == 0)
 532                 return;
 533
 534         acpi_tables_addr =
 535                 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
 536                                        all_tables_size, PAGE_SIZE);
 537         if (!acpi_tables_addr) {
 538                 WARN_ON(1);
 539                 return;
 540         }
 541         /*
 542          * Only calling e820_add_reserve does not work and the
 543          * tables are invalid (memory got used) later.
 544          * memblock_reserve works as expected and the tables won't get modified.
 545          * But it's not enough on X86 because ioremap will
 546          * complain later (used by acpi_os_map_memory) that the pages
 547          * that should get mapped are not marked "reserved".
 548          * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
 549          * works fine.
 550          */
 551         memblock_reserve(acpi_tables_addr, all_tables_size);
 552         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 553
 554         /*
 555          * early_ioremap only can remap 256k one time. If we map all
 556          * tables one time, we will hit the limit. Need to map chunks
 557          * one by one during copying the same as that in relocate_initrd().
 558          */
 559         for (no = 0; no < table_nr; no++) {
 560                 unsigned char *src_p = acpi_initrd_files[no].data;
 561                 phys_addr_t size = acpi_initrd_files[no].size;
 562                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 563                 phys_addr_t slop, clen;
 564                 char *dest_p;
 565
 566                 total_offset += size;
 567
 568                 while (size) {
 569                         slop = dest_addr & ~PAGE_MASK;
 570                         clen = size;
 571                         if (clen > MAP_CHUNK_SIZE - slop)
 572                                 clen = MAP_CHUNK_SIZE - slop;
 573                         dest_p = early_memremap(dest_addr & PAGE_MASK,
 574                                                 clen + slop);
 575                         memcpy(dest_p + slop, src_p, clen);
 576                         early_memunmap(dest_p, clen + slop);
 577                         src_p += clen;
 578                         dest_addr += clen;
 579                         size -= clen;
 580                 }
 581         }
 582 }
 583
 584 static acpi_status
 585 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 586                            acpi_physical_address *address, u32 *length)
 587 {
 588         int table_offset = 0;
 589         int table_index = 0;
 590         struct acpi_table_header *table;
 591         u32 table_length;
 592
 593         *length = 0;
 594         *address = 0;
 595         if (!acpi_tables_addr)
 596                 return AE_OK;
 597
 598         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 599                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 600                                            ACPI_HEADER_SIZE);
 601                 if (table_offset + table->length > all_tables_size) {
 602                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 603                         WARN_ON(1);
 604                         return AE_OK;
 605                 }
 606
 607                 table_length = table->length;
 608
 609                 /* Only override tables matched */
 610                 if (memcmp(existing_table->signature, table->signature, 4) ||
 611                     memcmp(table->oem_id, existing_table->oem_id,
 612                            ACPI_OEM_ID_SIZE) ||
 613                     memcmp(table->oem_table_id, existing_table->oem_table_id,
 614                            ACPI_OEM_TABLE_ID_SIZE)) {
 615                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 616                         goto next_table;
 617                 }
 618                 /*
 619                  * Mark the table to avoid being used in
 620                  * acpi_table_initrd_scan() and check the revision.
 621                  */
 622                 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
 623                     existing_table->oem_revision >= table->oem_revision) {
 624                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 625                         goto next_table;
 626                 }
 627
 628                 *length = table_length;
 629                 *address = acpi_tables_addr + table_offset;
 630                 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
 631                         table->signature, table->oem_id,
 632                         table->oem_table_id);
 633                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 634                 break;
 635
 636 next_table:
 637                 table_offset += table_length;
 638                 table_index++;
 639         }
 640         return AE_OK;
 641 }
 642
 643 static void __init acpi_table_initrd_scan(void)
 644 {
 645         int table_offset = 0;
 646         int table_index = 0;
 647         u32 table_length;
 648         struct acpi_table_header *table;
 649
 650         if (!acpi_tables_addr)
 651                 return;
 652
 653         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 654                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 655                                            ACPI_HEADER_SIZE);
 656                 if (table_offset + table->length > all_tables_size) {
 657                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 658                         WARN_ON(1);
 659                         return;
 660                 }
 661
 662                 table_length = table->length;
 663
 664                 /* Skip RSDT/XSDT which should only be used for override */
 665                 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
 666                     ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
 667                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 668                         goto next_table;
 669                 }
 670                 /*
 671                  * Mark the table to avoid being used in
 672                  * acpi_table_initrd_override(). Though this is not possible
 673                  * because override is disabled in acpi_install_table().
 674                  */
 675                 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
 676                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 677                         goto next_table;
 678                 }
 679
 680                 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
 681                         table->signature, table->oem_id,
 682                         table->oem_table_id);
 683                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 684                 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
 685 next_table:
 686                 table_offset += table_length;
 687                 table_index++;
 688         }
 689 }
 690 #else
 691 static acpi_status
 692 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 693                            acpi_physical_address *address,
 694                            u32 *table_length)
 695 {
 696         *table_length = 0;
 697         *address = 0;
 698         return AE_OK;
 699 }
 700
 701 static void __init acpi_table_initrd_scan(void)
 702 {
 703 }
 704 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
 705
 706 acpi_status
 707 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 708                                 acpi_physical_address *address,
 709                                 u32 *table_length)
 710 {
 711         return acpi_table_initrd_override(existing_table, address,
 712                                           table_length);
 713 }
 714
 715 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 716 static void *amlcode __attribute__ ((weakref("AmlCode")));
 717 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
 718 #endif
 719
 720 acpi_status
 721 acpi_os_table_override(struct acpi_table_header *existing_table,
 722                        struct acpi_table_header **new_table)
 723 {
 724         if (!existing_table || !new_table)
 725                 return AE_BAD_PARAMETER;
 726
 727         *new_table = NULL;
 728
 729 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 730         if (!strncmp(existing_table->signature, "DSDT", 4)) {
 731                 *new_table = (struct acpi_table_header *)&amlcode;
 732                 if (!(*new_table))
 733                         *new_table = (struct acpi_table_header *)&dsdt_amlcode;
 734         }
 735 #endif
 736         if (*new_table != NULL)
 737                 acpi_table_taint(existing_table);
 738         return AE_OK;
 739 }
 740
 741 /*
 742  * acpi_table_init()
 743  *
 744  * find RSDP, find and checksum SDT/XSDT.
 745  * checksum all tables, print SDT/XSDT
 746  *
 747  * result: sdt_entry[] is initialized
 748  */
 749
 750 int __init acpi_table_init(void)
 751 {
 752         acpi_status status;
 753
 754         if (acpi_verify_table_checksum) {
 755                 pr_info("Early table checksum verification enabled\n");
 756                 acpi_gbl_enable_table_validation = TRUE;
 757         } else {
 758                 pr_info("Early table checksum verification disabled\n");
 759                 acpi_gbl_enable_table_validation = FALSE;
 760         }
 761
 762         status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 763         if (ACPI_FAILURE(status))
 764                 return -EINVAL;
 765         acpi_table_initrd_scan();
 766
 767         check_multiple_madt();
 768         return 0;
 769 }
 770
 771 static int __init acpi_parse_apic_instance(char *str)
 772 {
 773         if (!str)
 774                 return -EINVAL;
 775
 776         if (kstrtoint(str, 0, &acpi_apic_instance))
 777                 return -EINVAL;
 778
 779         pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
 780
 781         return 0;
 782 }
 783
 784 early_param("acpi_apic_instance", acpi_parse_apic_instance);
 785
 786 static int __init acpi_force_table_verification_setup(char *s)
 787 {
 788         acpi_verify_table_checksum = true;
 789
 790         return 0;
 791 }
 792
 793 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
 794
 795 static int __init acpi_force_32bit_fadt_addr(char *s)
 796 {
 797         pr_info("Forcing 32 Bit FADT addresses\n");
 798         acpi_gbl_use32_bit_fadt_addresses = TRUE;
 799
 800         return 0;
 801 }
 802
 803 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);