drivers/acpi/tables.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_tables.c - ACPI Boot-Time Table Parsing
   4  *
   5  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  */
   7
   8 /* Uncomment next line to get verbose printout */
   9 /* #define DEBUG */
  10 #define pr_fmt(fmt) "ACPI: " fmt
  11
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/smp.h>
  15 #include <linux/string.h>
  16 #include <linux/types.h>
  17 #include <linux/irq.h>
  18 #include <linux/errno.h>
  19 #include <linux/acpi.h>
  20 #include <linux/memblock.h>
  21 #include <linux/earlycpio.h>
  22 #include <linux/initrd.h>
  23 #include <linux/security.h>
  24 #include <linux/kmemleak.h>
  25 #include "internal.h"
  26
  27 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  28 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  29 #endif
  30
  31 #define ACPI_MAX_TABLES         128
  32
  33 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
  34 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
  35
  36 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
  37
  38 static int acpi_apic_instance __initdata_or_acpilib;
  39
  40 enum acpi_subtable_type {
  41         ACPI_SUBTABLE_COMMON,
  42         ACPI_SUBTABLE_HMAT,
  43         ACPI_SUBTABLE_PRMT,
  44         ACPI_SUBTABLE_CEDT,
  45 };
  46
  47 struct acpi_subtable_entry {
  48         union acpi_subtable_headers *hdr;
  49         enum acpi_subtable_type type;
  50 };
  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_or_acpilib = 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[0x%llx])\n",
 155                                 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 static unsigned long __init_or_acpilib
 221 acpi_get_entry_type(struct acpi_subtable_entry *entry)
 222 {
 223         switch (entry->type) {
 224         case ACPI_SUBTABLE_COMMON:
 225                 return entry->hdr->common.type;
 226         case ACPI_SUBTABLE_HMAT:
 227                 return entry->hdr->hmat.type;
 228         case ACPI_SUBTABLE_PRMT:
 229                 return 0;
 230         case ACPI_SUBTABLE_CEDT:
 231                 return entry->hdr->cedt.type;
 232         }
 233         return 0;
 234 }
 235
 236 static unsigned long __init_or_acpilib
 237 acpi_get_entry_length(struct acpi_subtable_entry *entry)
 238 {
 239         switch (entry->type) {
 240         case ACPI_SUBTABLE_COMMON:
 241                 return entry->hdr->common.length;
 242         case ACPI_SUBTABLE_HMAT:
 243                 return entry->hdr->hmat.length;
 244         case ACPI_SUBTABLE_PRMT:
 245                 return entry->hdr->prmt.length;
 246         case ACPI_SUBTABLE_CEDT:
 247                 return entry->hdr->cedt.length;
 248         }
 249         return 0;
 250 }
 251
 252 static unsigned long __init_or_acpilib
 253 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
 254 {
 255         switch (entry->type) {
 256         case ACPI_SUBTABLE_COMMON:
 257                 return sizeof(entry->hdr->common);
 258         case ACPI_SUBTABLE_HMAT:
 259                 return sizeof(entry->hdr->hmat);
 260         case ACPI_SUBTABLE_PRMT:
 261                 return sizeof(entry->hdr->prmt);
 262         case ACPI_SUBTABLE_CEDT:
 263                 return sizeof(entry->hdr->cedt);
 264         }
 265         return 0;
 266 }
 267
 268 static enum acpi_subtable_type __init_or_acpilib
 269 acpi_get_subtable_type(char *id)
 270 {
 271         if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
 272                 return ACPI_SUBTABLE_HMAT;
 273         if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
 274                 return ACPI_SUBTABLE_PRMT;
 275         if (strncmp(id, ACPI_SIG_CEDT, 4) == 0)
 276                 return ACPI_SUBTABLE_CEDT;
 277         return ACPI_SUBTABLE_COMMON;
 278 }
 279
 280 static __init_or_acpilib bool has_handler(struct acpi_subtable_proc *proc)
 281 {
 282         return proc->handler || proc->handler_arg;
 283 }
 284
 285 static __init_or_acpilib int call_handler(struct acpi_subtable_proc *proc,
 286                                           union acpi_subtable_headers *hdr,
 287                                           unsigned long end)
 288 {
 289         if (proc->handler)
 290                 return proc->handler(hdr, end);
 291         if (proc->handler_arg)
 292                 return proc->handler_arg(hdr, proc->arg, end);
 293         return -EINVAL;
 294 }
 295
 296 /**
 297  * acpi_parse_entries_array - for each proc_num find a suitable subtable
 298  *
 299  * @id: table id (for debugging purposes)
 300  * @table_size: size of the root table
 301  * @table_header: where does the table start?
 302  * @proc: array of acpi_subtable_proc struct containing entry id
 303  *        and associated handler with it
 304  * @proc_num: how big proc is?
 305  * @max_entries: how many entries can we process?
 306  *
 307  * For each proc_num find a subtable with proc->id and run proc->handler
 308  * on it. Assumption is that there's only single handler for particular
 309  * entry id.
 310  *
 311  * The table_size is not the size of the complete ACPI table (the length
 312  * field in the header struct), but only the size of the root table; i.e.,
 313  * the offset from the very first byte of the complete ACPI table, to the
 314  * first byte of the very first subtable.
 315  *
 316  * On success returns sum of all matching entries for all proc handlers.
 317  * Otherwise, -ENODEV or -EINVAL is returned.
 318  */
 319 static int __init_or_acpilib acpi_parse_entries_array(
 320         char *id, unsigned long table_size,
 321         struct acpi_table_header *table_header, struct acpi_subtable_proc *proc,
 322         int proc_num, unsigned int max_entries)
 323 {
 324         struct acpi_subtable_entry entry;
 325         unsigned long table_end, subtable_len, entry_len;
 326         int count = 0;
 327         int errs = 0;
 328         int i;
 329
 330         table_end = (unsigned long)table_header + table_header->length;
 331
 332         /* Parse all entries looking for a match. */
 333
 334         entry.type = acpi_get_subtable_type(id);
 335         entry.hdr = (union acpi_subtable_headers *)
 336             ((unsigned long)table_header + table_size);
 337         subtable_len = acpi_get_subtable_header_length(&entry);
 338
 339         while (((unsigned long)entry.hdr) + subtable_len  < table_end) {
 340                 if (max_entries && count >= max_entries)
 341                         break;
 342
 343                 for (i = 0; i < proc_num; i++) {
 344                         if (acpi_get_entry_type(&entry) != proc[i].id)
 345                                 continue;
 346                         if (!has_handler(&proc[i]) ||
 347                             (!errs &&
 348                              call_handler(&proc[i], entry.hdr, table_end))) {
 349                                 errs++;
 350                                 continue;
 351                         }
 352
 353                         proc[i].count++;
 354                         break;
 355                 }
 356                 if (i != proc_num)
 357                         count++;
 358
 359                 /*
 360                  * If entry->length is 0, break from this loop to avoid
 361                  * infinite loop.
 362                  */
 363                 entry_len = acpi_get_entry_length(&entry);
 364                 if (entry_len == 0) {
 365                         pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
 366                         return -EINVAL;
 367                 }
 368
 369                 entry.hdr = (union acpi_subtable_headers *)
 370                     ((unsigned long)entry.hdr + entry_len);
 371         }
 372
 373         if (max_entries && count > max_entries) {
 374                 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
 375                         id, proc->id, count);
 376         }
 377
 378         return errs ? -EINVAL : count;
 379 }
 380
 381 int __init_or_acpilib acpi_table_parse_entries_array(
 382         char *id, unsigned long table_size, struct acpi_subtable_proc *proc,
 383         int proc_num, unsigned int max_entries)
 384 {
 385         struct acpi_table_header *table_header = NULL;
 386         int count;
 387         u32 instance = 0;
 388
 389         if (acpi_disabled)
 390                 return -ENODEV;
 391
 392         if (!id)
 393                 return -EINVAL;
 394
 395         if (!table_size)
 396                 return -EINVAL;
 397
 398         if (!strncmp(id, ACPI_SIG_MADT, 4))
 399                 instance = acpi_apic_instance;
 400
 401         acpi_get_table(id, instance, &table_header);
 402         if (!table_header) {
 403                 pr_debug("%4.4s not present\n", id);
 404                 return -ENODEV;
 405         }
 406
 407         count = acpi_parse_entries_array(id, table_size, table_header,
 408                         proc, proc_num, max_entries);
 409
 410         acpi_put_table(table_header);
 411         return count;
 412 }
 413
 414 static int __init_or_acpilib __acpi_table_parse_entries(
 415         char *id, unsigned long table_size, int entry_id,
 416         acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg,
 417         void *arg, unsigned int max_entries)
 418 {
 419         struct acpi_subtable_proc proc = {
 420                 .id             = entry_id,
 421                 .handler        = handler,
 422                 .handler_arg    = handler_arg,
 423                 .arg            = arg,
 424         };
 425
 426         return acpi_table_parse_entries_array(id, table_size, &proc, 1,
 427                                                 max_entries);
 428 }
 429
 430 int __init_or_acpilib
 431 acpi_table_parse_cedt(enum acpi_cedt_type id,
 432                       acpi_tbl_entry_handler_arg handler_arg, void *arg)
 433 {
 434         return __acpi_table_parse_entries(ACPI_SIG_CEDT,
 435                                           sizeof(struct acpi_table_cedt), id,
 436                                           NULL, handler_arg, arg, 0);
 437 }
 438 EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt);
 439
 440 int __init acpi_table_parse_entries(char *id, unsigned long table_size,
 441                                     int entry_id,
 442                                     acpi_tbl_entry_handler handler,
 443                                     unsigned int max_entries)
 444 {
 445         return __acpi_table_parse_entries(id, table_size, entry_id, handler,
 446                                           NULL, NULL, max_entries);
 447 }
 448
 449 int __init acpi_table_parse_madt(enum acpi_madt_type id,
 450                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 451 {
 452         return acpi_table_parse_entries(ACPI_SIG_MADT,
 453                                             sizeof(struct acpi_table_madt), id,
 454                                             handler, max_entries);
 455 }
 456
 457 /**
 458  * acpi_table_parse - find table with @id, run @handler on it
 459  * @id: table id to find
 460  * @handler: handler to run
 461  *
 462  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 463  * run @handler on it.
 464  *
 465  * Return 0 if table found, -errno if not.
 466  */
 467 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
 468 {
 469         struct acpi_table_header *table = NULL;
 470
 471         if (acpi_disabled)
 472                 return -ENODEV;
 473
 474         if (!id || !handler)
 475                 return -EINVAL;
 476
 477         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
 478                 acpi_get_table(id, acpi_apic_instance, &table);
 479         else
 480                 acpi_get_table(id, 0, &table);
 481
 482         if (table) {
 483                 handler(table);
 484                 acpi_put_table(table);
 485                 return 0;
 486         } else
 487                 return -ENODEV;
 488 }
 489
 490 /*
 491  * The BIOS is supposed to supply a single APIC/MADT,
 492  * but some report two.  Provide a knob to use either.
 493  * (don't you wish instance 0 and 1 were not the same?)
 494  */
 495 static void __init check_multiple_madt(void)
 496 {
 497         struct acpi_table_header *table = NULL;
 498
 499         acpi_get_table(ACPI_SIG_MADT, 2, &table);
 500         if (table) {
 501                 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
 502                         acpi_apic_instance);
 503                 pr_warn("If \"acpi_apic_instance=%d\" works better, "
 504                         "notify linux-acpi@vger.kernel.org\n",
 505                         acpi_apic_instance ? 0 : 2);
 506                 acpi_put_table(table);
 507
 508         } else
 509                 acpi_apic_instance = 0;
 510
 511         return;
 512 }
 513
 514 static void acpi_table_taint(struct acpi_table_header *table)
 515 {
 516         pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 517                 table->signature, table->oem_table_id);
 518         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 519 }
 520
 521 #ifdef CONFIG_ACPI_TABLE_UPGRADE
 522 static u64 acpi_tables_addr;
 523 static int all_tables_size;
 524
 525 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 526 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 527 {
 528         u8 sum = 0;
 529         u8 *end = buffer + length;
 530
 531         while (buffer < end)
 532                 sum = (u8) (sum + *(buffer++));
 533         return sum;
 534 }
 535
 536 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 537 static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
 538         ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
 539         ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
 540         ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
 541         ACPI_SIG_ASF,  ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
 542         ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
 543         ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
 544         ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
 545         ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
 546         ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
 547         ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
 548         ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI };
 549
 550 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 551
 552 #define NR_ACPI_INITRD_TABLES 64
 553 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
 554 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
 555
 556 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 557
 558 void __init acpi_table_upgrade(void)
 559 {
 560         void *data;
 561         size_t size;
 562         int sig, no, table_nr = 0, total_offset = 0;
 563         long offset = 0;
 564         struct acpi_table_header *table;
 565         char cpio_path[32] = "kernel/firmware/acpi/";
 566         struct cpio_data file;
 567
 568         if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
 569                 data = __initramfs_start;
 570                 size = __initramfs_size;
 571         } else {
 572                 data = (void *)initrd_start;
 573                 size = initrd_end - initrd_start;
 574         }
 575
 576         if (data == NULL || size == 0)
 577                 return;
 578
 579         for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
 580                 file = find_cpio_data(cpio_path, data, size, &offset);
 581                 if (!file.data)
 582                         break;
 583
 584                 data += offset;
 585                 size -= offset;
 586
 587                 if (file.size < sizeof(struct acpi_table_header)) {
 588                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 589                                 cpio_path, file.name);
 590                         continue;
 591                 }
 592
 593                 table = file.data;
 594
 595                 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
 596                         if (!memcmp(table->signature, table_sigs[sig], 4))
 597                                 break;
 598
 599                 if (sig >= ARRAY_SIZE(table_sigs)) {
 600                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 601                                 cpio_path, file.name);
 602                         continue;
 603                 }
 604                 if (file.size != table->length) {
 605                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 606                                 cpio_path, file.name);
 607                         continue;
 608                 }
 609                 if (acpi_table_checksum(file.data, table->length)) {
 610                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 611                                 cpio_path, file.name);
 612                         continue;
 613                 }
 614
 615                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 616                         table->signature, cpio_path, file.name, table->length);
 617
 618                 all_tables_size += table->length;
 619                 acpi_initrd_files[table_nr].data = file.data;
 620                 acpi_initrd_files[table_nr].size = file.size;
 621                 table_nr++;
 622         }
 623         if (table_nr == 0)
 624                 return;
 625
 626         if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
 627                 pr_notice("kernel is locked down, ignoring table override\n");
 628                 return;
 629         }
 630
 631         acpi_tables_addr =
 632                 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE,
 633                                           0, ACPI_TABLE_UPGRADE_MAX_PHYS);
 634         if (!acpi_tables_addr) {
 635                 WARN_ON(1);
 636                 return;
 637         }
 638         /*
 639          * Only calling e820_add_reserve does not work and the
 640          * tables are invalid (memory got used) later.
 641          * memblock_reserve works as expected and the tables won't get modified.
 642          * But it's not enough on X86 because ioremap will
 643          * complain later (used by acpi_os_map_memory) that the pages
 644          * that should get mapped are not marked "reserved".
 645          * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
 646          * works fine.
 647          */
 648         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 649
 650         kmemleak_ignore_phys(acpi_tables_addr);
 651
 652         /*
 653          * early_ioremap only can remap 256k one time. If we map all
 654          * tables one time, we will hit the limit. Need to map chunks
 655          * one by one during copying the same as that in relocate_initrd().
 656          */
 657         for (no = 0; no < table_nr; no++) {
 658                 unsigned char *src_p = acpi_initrd_files[no].data;
 659                 phys_addr_t size = acpi_initrd_files[no].size;
 660                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 661                 phys_addr_t slop, clen;
 662                 char *dest_p;
 663
 664                 total_offset += size;
 665
 666                 while (size) {
 667                         slop = dest_addr & ~PAGE_MASK;
 668                         clen = size;
 669                         if (clen > MAP_CHUNK_SIZE - slop)
 670                                 clen = MAP_CHUNK_SIZE - slop;
 671                         dest_p = early_memremap(dest_addr & PAGE_MASK,
 672                                                 clen + slop);
 673                         memcpy(dest_p + slop, src_p, clen);
 674                         early_memunmap(dest_p, clen + slop);
 675                         src_p += clen;
 676                         dest_addr += clen;
 677                         size -= clen;
 678                 }
 679         }
 680 }
 681
 682 static acpi_status
 683 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 684                            acpi_physical_address *address, u32 *length)
 685 {
 686         int table_offset = 0;
 687         int table_index = 0;
 688         struct acpi_table_header *table;
 689         u32 table_length;
 690
 691         *length = 0;
 692         *address = 0;
 693         if (!acpi_tables_addr)
 694                 return AE_OK;
 695
 696         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 697                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 698                                            ACPI_HEADER_SIZE);
 699                 if (table_offset + table->length > all_tables_size) {
 700                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 701                         WARN_ON(1);
 702                         return AE_OK;
 703                 }
 704
 705                 table_length = table->length;
 706
 707                 /* Only override tables matched */
 708                 if (memcmp(existing_table->signature, table->signature, 4) ||
 709                     memcmp(table->oem_id, existing_table->oem_id,
 710                            ACPI_OEM_ID_SIZE) ||
 711                     memcmp(table->oem_table_id, existing_table->oem_table_id,
 712                            ACPI_OEM_TABLE_ID_SIZE)) {
 713                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 714                         goto next_table;
 715                 }
 716                 /*
 717                  * Mark the table to avoid being used in
 718                  * acpi_table_initrd_scan() and check the revision.
 719                  */
 720                 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
 721                     existing_table->oem_revision >= table->oem_revision) {
 722                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 723                         goto next_table;
 724                 }
 725
 726                 *length = table_length;
 727                 *address = acpi_tables_addr + table_offset;
 728                 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
 729                         table->signature, table->oem_id,
 730                         table->oem_table_id);
 731                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 732                 break;
 733
 734 next_table:
 735                 table_offset += table_length;
 736                 table_index++;
 737         }
 738         return AE_OK;
 739 }
 740
 741 static void __init acpi_table_initrd_scan(void)
 742 {
 743         int table_offset = 0;
 744         int table_index = 0;
 745         u32 table_length;
 746         struct acpi_table_header *table;
 747
 748         if (!acpi_tables_addr)
 749                 return;
 750
 751         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 752                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 753                                            ACPI_HEADER_SIZE);
 754                 if (table_offset + table->length > all_tables_size) {
 755                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 756                         WARN_ON(1);
 757                         return;
 758                 }
 759
 760                 table_length = table->length;
 761
 762                 /* Skip RSDT/XSDT which should only be used for override */
 763                 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
 764                     ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
 765                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 766                         goto next_table;
 767                 }
 768                 /*
 769                  * Mark the table to avoid being used in
 770                  * acpi_table_initrd_override(). Though this is not possible
 771                  * because override is disabled in acpi_install_physical_table().
 772                  */
 773                 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
 774                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 775                         goto next_table;
 776                 }
 777
 778                 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
 779                         table->signature, table->oem_id,
 780                         table->oem_table_id);
 781                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 782                 acpi_install_physical_table(acpi_tables_addr + table_offset);
 783 next_table:
 784                 table_offset += table_length;
 785                 table_index++;
 786         }
 787 }
 788 #else
 789 static acpi_status
 790 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 791                            acpi_physical_address *address,
 792                            u32 *table_length)
 793 {
 794         *table_length = 0;
 795         *address = 0;
 796         return AE_OK;
 797 }
 798
 799 static void __init acpi_table_initrd_scan(void)
 800 {
 801 }
 802 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
 803
 804 acpi_status
 805 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 806                                 acpi_physical_address *address,
 807                                 u32 *table_length)
 808 {
 809         return acpi_table_initrd_override(existing_table, address,
 810                                           table_length);
 811 }
 812
 813 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 814 static void *amlcode __attribute__ ((weakref("AmlCode")));
 815 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
 816 #endif
 817
 818 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
 819                        struct acpi_table_header **new_table)
 820 {
 821         if (!existing_table || !new_table)
 822                 return AE_BAD_PARAMETER;
 823
 824         *new_table = NULL;
 825
 826 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 827         if (!strncmp(existing_table->signature, "DSDT", 4)) {
 828                 *new_table = (struct acpi_table_header *)&amlcode;
 829                 if (!(*new_table))
 830                         *new_table = (struct acpi_table_header *)&dsdt_amlcode;
 831         }
 832 #endif
 833         if (*new_table != NULL)
 834                 acpi_table_taint(existing_table);
 835         return AE_OK;
 836 }
 837
 838 /*
 839  * acpi_locate_initial_tables()
 840  *
 841  * find RSDP, find and checksum SDT/XSDT.
 842  * checksum all tables, print SDT/XSDT
 843  *
 844  * result: sdt_entry[] is initialized
 845  */
 846
 847 int __init acpi_locate_initial_tables(void)
 848 {
 849         acpi_status status;
 850
 851         if (acpi_verify_table_checksum) {
 852                 pr_info("Early table checksum verification enabled\n");
 853                 acpi_gbl_enable_table_validation = TRUE;
 854         } else {
 855                 pr_info("Early table checksum verification disabled\n");
 856                 acpi_gbl_enable_table_validation = FALSE;
 857         }
 858
 859         status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 860         if (ACPI_FAILURE(status))
 861                 return -EINVAL;
 862
 863         return 0;
 864 }
 865
 866 void __init acpi_reserve_initial_tables(void)
 867 {
 868         int i;
 869
 870         for (i = 0; i < ACPI_MAX_TABLES; i++) {
 871                 struct acpi_table_desc *table_desc = &initial_tables[i];
 872                 u64 start = table_desc->address;
 873                 u64 size = table_desc->length;
 874
 875                 if (!start || !size)
 876                         break;
 877
 878                 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
 879                         table_desc->signature.ascii, start, start + size - 1);
 880
 881                 memblock_reserve(start, size);
 882         }
 883 }
 884
 885 void __init acpi_table_init_complete(void)
 886 {
 887         acpi_table_initrd_scan();
 888         check_multiple_madt();
 889 }
 890
 891 int __init acpi_table_init(void)
 892 {
 893         int ret;
 894
 895         ret = acpi_locate_initial_tables();
 896         if (ret)
 897                 return ret;
 898
 899         acpi_table_init_complete();
 900
 901         return 0;
 902 }
 903
 904 static int __init acpi_parse_apic_instance(char *str)
 905 {
 906         if (!str)
 907                 return -EINVAL;
 908
 909         if (kstrtoint(str, 0, &acpi_apic_instance))
 910                 return -EINVAL;
 911
 912         pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
 913
 914         return 0;
 915 }
 916 early_param("acpi_apic_instance", acpi_parse_apic_instance);
 917
 918 static int __init acpi_force_table_verification_setup(char *s)
 919 {
 920         acpi_verify_table_checksum = true;
 921
 922         return 0;
 923 }
 924 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
 925
 926 static int __init acpi_force_32bit_fadt_addr(char *s)
 927 {
 928         pr_info("Forcing 32 Bit FADT addresses\n");
 929         acpi_gbl_use32_bit_fadt_addresses = TRUE;
 930
 931         return 0;
 932 }
 933 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);