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 "internal.h"
  25
  26 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  27 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  28 #endif
  29
  30 #define ACPI_MAX_TABLES         128
  31
  32 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
  33 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
  34
  35 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
  36
  37 static int acpi_apic_instance __initdata;
  38
  39 enum acpi_subtable_type {
  40         ACPI_SUBTABLE_COMMON,
  41         ACPI_SUBTABLE_HMAT,
  42 };
  43
  44 struct acpi_subtable_entry {
  45         union acpi_subtable_headers *hdr;
  46         enum acpi_subtable_type type;
  47 };
  48
  49 /*
  50  * Disable table checksum verification for the early stage due to the size
  51  * limitation of the current x86 early mapping implementation.
  52  */
  53 static bool acpi_verify_table_checksum __initdata = false;
  54
  55 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
  56 {
  57         if (!header)
  58                 return;
  59
  60         switch (header->type) {
  61
  62         case ACPI_MADT_TYPE_LOCAL_APIC:
  63                 {
  64                         struct acpi_madt_local_apic *p =
  65                             (struct acpi_madt_local_apic *)header;
  66                         pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
  67                                  p->processor_id, p->id,
  68                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  69                 }
  70                 break;
  71
  72         case ACPI_MADT_TYPE_LOCAL_X2APIC:
  73                 {
  74                         struct acpi_madt_local_x2apic *p =
  75                             (struct acpi_madt_local_x2apic *)header;
  76                         pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
  77                                  p->local_apic_id, p->uid,
  78                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  79                 }
  80                 break;
  81
  82         case ACPI_MADT_TYPE_IO_APIC:
  83                 {
  84                         struct acpi_madt_io_apic *p =
  85                             (struct acpi_madt_io_apic *)header;
  86                         pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
  87                                  p->id, p->address, p->global_irq_base);
  88                 }
  89                 break;
  90
  91         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  92                 {
  93                         struct acpi_madt_interrupt_override *p =
  94                             (struct acpi_madt_interrupt_override *)header;
  95                         pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
  96                                 p->bus, p->source_irq, p->global_irq,
  97                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
  98                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
  99                         if (p->inti_flags  &
 100                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
 101                                 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
 102                                         p->inti_flags  &
 103                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
 104                 }
 105                 break;
 106
 107         case ACPI_MADT_TYPE_NMI_SOURCE:
 108                 {
 109                         struct acpi_madt_nmi_source *p =
 110                             (struct acpi_madt_nmi_source *)header;
 111                         pr_info("NMI_SRC (%s %s global_irq %d)\n",
 112                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 113                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 114                                 p->global_irq);
 115                 }
 116                 break;
 117
 118         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 119                 {
 120                         struct acpi_madt_local_apic_nmi *p =
 121                             (struct acpi_madt_local_apic_nmi *)header;
 122                         pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 123                                 p->processor_id,
 124                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
 125                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 126                                 p->lint);
 127                 }
 128                 break;
 129
 130         case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
 131                 {
 132                         u16 polarity, trigger;
 133                         struct acpi_madt_local_x2apic_nmi *p =
 134                             (struct acpi_madt_local_x2apic_nmi *)header;
 135
 136                         polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
 137                         trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 138
 139                         pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
 140                                 p->uid,
 141                                 mps_inti_flags_polarity[polarity],
 142                                 mps_inti_flags_trigger[trigger],
 143                                 p->lint);
 144                 }
 145                 break;
 146
 147         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 148                 {
 149                         struct acpi_madt_local_apic_override *p =
 150                             (struct acpi_madt_local_apic_override *)header;
 151                         pr_info("LAPIC_ADDR_OVR (address[%p])\n",
 152                                 (void *)(unsigned long)p->address);
 153                 }
 154                 break;
 155
 156         case ACPI_MADT_TYPE_IO_SAPIC:
 157                 {
 158                         struct acpi_madt_io_sapic *p =
 159                             (struct acpi_madt_io_sapic *)header;
 160                         pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 161                                  p->id, (void *)(unsigned long)p->address,
 162                                  p->global_irq_base);
 163                 }
 164                 break;
 165
 166         case ACPI_MADT_TYPE_LOCAL_SAPIC:
 167                 {
 168                         struct acpi_madt_local_sapic *p =
 169                             (struct acpi_madt_local_sapic *)header;
 170                         pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 171                                  p->processor_id, p->id, p->eid,
 172                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 173                 }
 174                 break;
 175
 176         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
 177                 {
 178                         struct acpi_madt_interrupt_source *p =
 179                             (struct acpi_madt_interrupt_source *)header;
 180                         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",
 181                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 182                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 183                                 p->type, p->id, p->eid, p->io_sapic_vector,
 184                                 p->global_irq);
 185                 }
 186                 break;
 187
 188         case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
 189                 {
 190                         struct acpi_madt_generic_interrupt *p =
 191                                 (struct acpi_madt_generic_interrupt *)header;
 192                         pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
 193                                  p->uid, p->base_address,
 194                                  p->arm_mpidr,
 195                                  (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 196
 197                 }
 198                 break;
 199
 200         case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
 201                 {
 202                         struct acpi_madt_generic_distributor *p =
 203                                 (struct acpi_madt_generic_distributor *)header;
 204                         pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
 205                                  p->gic_id, p->base_address,
 206                                  p->global_irq_base);
 207                 }
 208                 break;
 209
 210         default:
 211                 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
 212                         header->type);
 213                 break;
 214         }
 215 }
 216
 217 static unsigned long __init
 218 acpi_get_entry_type(struct acpi_subtable_entry *entry)
 219 {
 220         switch (entry->type) {
 221         case ACPI_SUBTABLE_COMMON:
 222                 return entry->hdr->common.type;
 223         case ACPI_SUBTABLE_HMAT:
 224                 return entry->hdr->hmat.type;
 225         }
 226         return 0;
 227 }
 228
 229 static unsigned long __init
 230 acpi_get_entry_length(struct acpi_subtable_entry *entry)
 231 {
 232         switch (entry->type) {
 233         case ACPI_SUBTABLE_COMMON:
 234                 return entry->hdr->common.length;
 235         case ACPI_SUBTABLE_HMAT:
 236                 return entry->hdr->hmat.length;
 237         }
 238         return 0;
 239 }
 240
 241 static unsigned long __init
 242 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
 243 {
 244         switch (entry->type) {
 245         case ACPI_SUBTABLE_COMMON:
 246                 return sizeof(entry->hdr->common);
 247         case ACPI_SUBTABLE_HMAT:
 248                 return sizeof(entry->hdr->hmat);
 249         }
 250         return 0;
 251 }
 252
 253 static enum acpi_subtable_type __init
 254 acpi_get_subtable_type(char *id)
 255 {
 256         if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
 257                 return ACPI_SUBTABLE_HMAT;
 258         return ACPI_SUBTABLE_COMMON;
 259 }
 260
 261 /**
 262  * acpi_parse_entries_array - for each proc_num find a suitable subtable
 263  *
 264  * @id: table id (for debugging purposes)
 265  * @table_size: size of the root table
 266  * @table_header: where does the table start?
 267  * @proc: array of acpi_subtable_proc struct containing entry id
 268  *        and associated handler with it
 269  * @proc_num: how big proc is?
 270  * @max_entries: how many entries can we process?
 271  *
 272  * For each proc_num find a subtable with proc->id and run proc->handler
 273  * on it. Assumption is that there's only single handler for particular
 274  * entry id.
 275  *
 276  * The table_size is not the size of the complete ACPI table (the length
 277  * field in the header struct), but only the size of the root table; i.e.,
 278  * the offset from the very first byte of the complete ACPI table, to the
 279  * first byte of the very first subtable.
 280  *
 281  * On success returns sum of all matching entries for all proc handlers.
 282  * Otherwise, -ENODEV or -EINVAL is returned.
 283  */
 284 static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
 285                 struct acpi_table_header *table_header,
 286                 struct acpi_subtable_proc *proc, int proc_num,
 287                 unsigned int max_entries)
 288 {
 289         struct acpi_subtable_entry entry;
 290         unsigned long table_end, subtable_len, entry_len;
 291         int count = 0;
 292         int errs = 0;
 293         int i;
 294
 295         if (acpi_disabled)
 296                 return -ENODEV;
 297
 298         if (!id)
 299                 return -EINVAL;
 300
 301         if (!table_size)
 302                 return -EINVAL;
 303
 304         if (!table_header) {
 305                 pr_warn("%4.4s not present\n", id);
 306                 return -ENODEV;
 307         }
 308
 309         table_end = (unsigned long)table_header + table_header->length;
 310
 311         /* Parse all entries looking for a match. */
 312
 313         entry.type = acpi_get_subtable_type(id);
 314         entry.hdr = (union acpi_subtable_headers *)
 315             ((unsigned long)table_header + table_size);
 316         subtable_len = acpi_get_subtable_header_length(&entry);
 317
 318         while (((unsigned long)entry.hdr) + subtable_len  < table_end) {
 319                 if (max_entries && count >= max_entries)
 320                         break;
 321
 322                 for (i = 0; i < proc_num; i++) {
 323                         if (acpi_get_entry_type(&entry) != proc[i].id)
 324                                 continue;
 325                         if (!proc[i].handler ||
 326                              (!errs && proc[i].handler(entry.hdr, table_end))) {
 327                                 errs++;
 328                                 continue;
 329                         }
 330
 331                         proc[i].count++;
 332                         break;
 333                 }
 334                 if (i != proc_num)
 335                         count++;
 336
 337                 /*
 338                  * If entry->length is 0, break from this loop to avoid
 339                  * infinite loop.
 340                  */
 341                 entry_len = acpi_get_entry_length(&entry);
 342                 if (entry_len == 0) {
 343                         pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
 344                         return -EINVAL;
 345                 }
 346
 347                 entry.hdr = (union acpi_subtable_headers *)
 348                     ((unsigned long)entry.hdr + entry_len);
 349         }
 350
 351         if (max_entries && count > max_entries) {
 352                 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
 353                         id, proc->id, count);
 354         }
 355
 356         return errs ? -EINVAL : count;
 357 }
 358
 359 int __init acpi_table_parse_entries_array(char *id,
 360                          unsigned long table_size,
 361                          struct acpi_subtable_proc *proc, int proc_num,
 362                          unsigned int max_entries)
 363 {
 364         struct acpi_table_header *table_header = NULL;
 365         int count;
 366         u32 instance = 0;
 367
 368         if (acpi_disabled)
 369                 return -ENODEV;
 370
 371         if (!id)
 372                 return -EINVAL;
 373
 374         if (!strncmp(id, ACPI_SIG_MADT, 4))
 375                 instance = acpi_apic_instance;
 376
 377         acpi_get_table(id, instance, &table_header);
 378         if (!table_header) {
 379                 pr_warn("%4.4s not present\n", id);
 380                 return -ENODEV;
 381         }
 382
 383         count = acpi_parse_entries_array(id, table_size, table_header,
 384                         proc, proc_num, max_entries);
 385
 386         acpi_put_table(table_header);
 387         return count;
 388 }
 389
 390 int __init acpi_table_parse_entries(char *id,
 391                         unsigned long table_size,
 392                         int entry_id,
 393                         acpi_tbl_entry_handler handler,
 394                         unsigned int max_entries)
 395 {
 396         struct acpi_subtable_proc proc = {
 397                 .id             = entry_id,
 398                 .handler        = handler,
 399         };
 400
 401         return acpi_table_parse_entries_array(id, table_size, &proc, 1,
 402                                                 max_entries);
 403 }
 404
 405 int __init acpi_table_parse_madt(enum acpi_madt_type id,
 406                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 407 {
 408         return acpi_table_parse_entries(ACPI_SIG_MADT,
 409                                             sizeof(struct acpi_table_madt), id,
 410                                             handler, max_entries);
 411 }
 412
 413 /**
 414  * acpi_table_parse - find table with @id, run @handler on it
 415  * @id: table id to find
 416  * @handler: handler to run
 417  *
 418  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 419  * run @handler on it.
 420  *
 421  * Return 0 if table found, -errno if not.
 422  */
 423 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
 424 {
 425         struct acpi_table_header *table = NULL;
 426
 427         if (acpi_disabled)
 428                 return -ENODEV;
 429
 430         if (!id || !handler)
 431                 return -EINVAL;
 432
 433         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
 434                 acpi_get_table(id, acpi_apic_instance, &table);
 435         else
 436                 acpi_get_table(id, 0, &table);
 437
 438         if (table) {
 439                 handler(table);
 440                 acpi_put_table(table);
 441                 return 0;
 442         } else
 443                 return -ENODEV;
 444 }
 445
 446 /*
 447  * The BIOS is supposed to supply a single APIC/MADT,
 448  * but some report two.  Provide a knob to use either.
 449  * (don't you wish instance 0 and 1 were not the same?)
 450  */
 451 static void __init check_multiple_madt(void)
 452 {
 453         struct acpi_table_header *table = NULL;
 454
 455         acpi_get_table(ACPI_SIG_MADT, 2, &table);
 456         if (table) {
 457                 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
 458                         acpi_apic_instance);
 459                 pr_warn("If \"acpi_apic_instance=%d\" works better, "
 460                         "notify linux-acpi@vger.kernel.org\n",
 461                         acpi_apic_instance ? 0 : 2);
 462                 acpi_put_table(table);
 463
 464         } else
 465                 acpi_apic_instance = 0;
 466
 467         return;
 468 }
 469
 470 static void acpi_table_taint(struct acpi_table_header *table)
 471 {
 472         pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 473                 table->signature, table->oem_table_id);
 474         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 475 }
 476
 477 #ifdef CONFIG_ACPI_TABLE_UPGRADE
 478 static u64 acpi_tables_addr;
 479 static int all_tables_size;
 480
 481 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 482 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 483 {
 484         u8 sum = 0;
 485         u8 *end = buffer + length;
 486
 487         while (buffer < end)
 488                 sum = (u8) (sum + *(buffer++));
 489         return sum;
 490 }
 491
 492 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 493 static const char * const table_sigs[] = {
 494         ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
 495         ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
 496         ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
 497         ACPI_SIG_ASF,  ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
 498         ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
 499         ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
 500         ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
 501         ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
 502         ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
 503         ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
 504         ACPI_SIG_NHLT, NULL };
 505
 506 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 507
 508 #define NR_ACPI_INITRD_TABLES 64
 509 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
 510 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
 511
 512 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 513
 514 void __init acpi_table_upgrade(void)
 515 {
 516         void *data;
 517         size_t size;
 518         int sig, no, table_nr = 0, total_offset = 0;
 519         long offset = 0;
 520         struct acpi_table_header *table;
 521         char cpio_path[32] = "kernel/firmware/acpi/";
 522         struct cpio_data file;
 523
 524         if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
 525                 data = __initramfs_start;
 526                 size = __initramfs_size;
 527         } else {
 528                 data = (void *)initrd_start;
 529                 size = initrd_end - initrd_start;
 530         }
 531
 532         if (data == NULL || size == 0)
 533                 return;
 534
 535         for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
 536                 file = find_cpio_data(cpio_path, data, size, &offset);
 537                 if (!file.data)
 538                         break;
 539
 540                 data += offset;
 541                 size -= offset;
 542
 543                 if (file.size < sizeof(struct acpi_table_header)) {
 544                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 545                                 cpio_path, file.name);
 546                         continue;
 547                 }
 548
 549                 table = file.data;
 550
 551                 for (sig = 0; table_sigs[sig]; sig++)
 552                         if (!memcmp(table->signature, table_sigs[sig], 4))
 553                                 break;
 554
 555                 if (!table_sigs[sig]) {
 556                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 557                                 cpio_path, file.name);
 558                         continue;
 559                 }
 560                 if (file.size != table->length) {
 561                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 562                                 cpio_path, file.name);
 563                         continue;
 564                 }
 565                 if (acpi_table_checksum(file.data, table->length)) {
 566                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 567                                 cpio_path, file.name);
 568                         continue;
 569                 }
 570
 571                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 572                         table->signature, cpio_path, file.name, table->length);
 573
 574                 all_tables_size += table->length;
 575                 acpi_initrd_files[table_nr].data = file.data;
 576                 acpi_initrd_files[table_nr].size = file.size;
 577                 table_nr++;
 578         }
 579         if (table_nr == 0)
 580                 return;
 581
 582         if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
 583                 pr_notice("kernel is locked down, ignoring table override\n");
 584                 return;
 585         }
 586
 587         acpi_tables_addr =
 588                 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
 589                                        all_tables_size, PAGE_SIZE);
 590         if (!acpi_tables_addr) {
 591                 WARN_ON(1);
 592                 return;
 593         }
 594         /*
 595          * Only calling e820_add_reserve does not work and the
 596          * tables are invalid (memory got used) later.
 597          * memblock_reserve works as expected and the tables won't get modified.
 598          * But it's not enough on X86 because ioremap will
 599          * complain later (used by acpi_os_map_memory) that the pages
 600          * that should get mapped are not marked "reserved".
 601          * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
 602          * works fine.
 603          */
 604         memblock_reserve(acpi_tables_addr, all_tables_size);
 605         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 606
 607         /*
 608          * early_ioremap only can remap 256k one time. If we map all
 609          * tables one time, we will hit the limit. Need to map chunks
 610          * one by one during copying the same as that in relocate_initrd().
 611          */
 612         for (no = 0; no < table_nr; no++) {
 613                 unsigned char *src_p = acpi_initrd_files[no].data;
 614                 phys_addr_t size = acpi_initrd_files[no].size;
 615                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 616                 phys_addr_t slop, clen;
 617                 char *dest_p;
 618
 619                 total_offset += size;
 620
 621                 while (size) {
 622                         slop = dest_addr & ~PAGE_MASK;
 623                         clen = size;
 624                         if (clen > MAP_CHUNK_SIZE - slop)
 625                                 clen = MAP_CHUNK_SIZE - slop;
 626                         dest_p = early_memremap(dest_addr & PAGE_MASK,
 627                                                 clen + slop);
 628                         memcpy(dest_p + slop, src_p, clen);
 629                         early_memunmap(dest_p, clen + slop);
 630                         src_p += clen;
 631                         dest_addr += clen;
 632                         size -= clen;
 633                 }
 634         }
 635 }
 636
 637 static acpi_status
 638 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 639                            acpi_physical_address *address, u32 *length)
 640 {
 641         int table_offset = 0;
 642         int table_index = 0;
 643         struct acpi_table_header *table;
 644         u32 table_length;
 645
 646         *length = 0;
 647         *address = 0;
 648         if (!acpi_tables_addr)
 649                 return AE_OK;
 650
 651         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 652                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 653                                            ACPI_HEADER_SIZE);
 654                 if (table_offset + table->length > all_tables_size) {
 655                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 656                         WARN_ON(1);
 657                         return AE_OK;
 658                 }
 659
 660                 table_length = table->length;
 661
 662                 /* Only override tables matched */
 663                 if (memcmp(existing_table->signature, table->signature, 4) ||
 664                     memcmp(table->oem_id, existing_table->oem_id,
 665                            ACPI_OEM_ID_SIZE) ||
 666                     memcmp(table->oem_table_id, existing_table->oem_table_id,
 667                            ACPI_OEM_TABLE_ID_SIZE)) {
 668                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 669                         goto next_table;
 670                 }
 671                 /*
 672                  * Mark the table to avoid being used in
 673                  * acpi_table_initrd_scan() and check the revision.
 674                  */
 675                 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
 676                     existing_table->oem_revision >= table->oem_revision) {
 677                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 678                         goto next_table;
 679                 }
 680
 681                 *length = table_length;
 682                 *address = acpi_tables_addr + table_offset;
 683                 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
 684                         table->signature, table->oem_id,
 685                         table->oem_table_id);
 686                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 687                 break;
 688
 689 next_table:
 690                 table_offset += table_length;
 691                 table_index++;
 692         }
 693         return AE_OK;
 694 }
 695
 696 static void __init acpi_table_initrd_scan(void)
 697 {
 698         int table_offset = 0;
 699         int table_index = 0;
 700         u32 table_length;
 701         struct acpi_table_header *table;
 702
 703         if (!acpi_tables_addr)
 704                 return;
 705
 706         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 707                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 708                                            ACPI_HEADER_SIZE);
 709                 if (table_offset + table->length > all_tables_size) {
 710                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 711                         WARN_ON(1);
 712                         return;
 713                 }
 714
 715                 table_length = table->length;
 716
 717                 /* Skip RSDT/XSDT which should only be used for override */
 718                 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
 719                     ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
 720                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 721                         goto next_table;
 722                 }
 723                 /*
 724                  * Mark the table to avoid being used in
 725                  * acpi_table_initrd_override(). Though this is not possible
 726                  * because override is disabled in acpi_install_table().
 727                  */
 728                 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
 729                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 730                         goto next_table;
 731                 }
 732
 733                 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
 734                         table->signature, table->oem_id,
 735                         table->oem_table_id);
 736                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 737                 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
 738 next_table:
 739                 table_offset += table_length;
 740                 table_index++;
 741         }
 742 }
 743 #else
 744 static acpi_status
 745 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 746                            acpi_physical_address *address,
 747                            u32 *table_length)
 748 {
 749         *table_length = 0;
 750         *address = 0;
 751         return AE_OK;
 752 }
 753
 754 static void __init acpi_table_initrd_scan(void)
 755 {
 756 }
 757 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
 758
 759 acpi_status
 760 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 761                                 acpi_physical_address *address,
 762                                 u32 *table_length)
 763 {
 764         return acpi_table_initrd_override(existing_table, address,
 765                                           table_length);
 766 }
 767
 768 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 769 static void *amlcode __attribute__ ((weakref("AmlCode")));
 770 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
 771 #endif
 772
 773 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
 774                        struct acpi_table_header **new_table)
 775 {
 776         if (!existing_table || !new_table)
 777                 return AE_BAD_PARAMETER;
 778
 779         *new_table = NULL;
 780
 781 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 782         if (!strncmp(existing_table->signature, "DSDT", 4)) {
 783                 *new_table = (struct acpi_table_header *)&amlcode;
 784                 if (!(*new_table))
 785                         *new_table = (struct acpi_table_header *)&dsdt_amlcode;
 786         }
 787 #endif
 788         if (*new_table != NULL)
 789                 acpi_table_taint(existing_table);
 790         return AE_OK;
 791 }
 792
 793 /*
 794  * acpi_table_init()
 795  *
 796  * find RSDP, find and checksum SDT/XSDT.
 797  * checksum all tables, print SDT/XSDT
 798  *
 799  * result: sdt_entry[] is initialized
 800  */
 801
 802 int __init acpi_table_init(void)
 803 {
 804         acpi_status status;
 805
 806         if (acpi_verify_table_checksum) {
 807                 pr_info("Early table checksum verification enabled\n");
 808                 acpi_gbl_enable_table_validation = TRUE;
 809         } else {
 810                 pr_info("Early table checksum verification disabled\n");
 811                 acpi_gbl_enable_table_validation = FALSE;
 812         }
 813
 814         status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 815         if (ACPI_FAILURE(status))
 816                 return -EINVAL;
 817         acpi_table_initrd_scan();
 818
 819         check_multiple_madt();
 820         return 0;
 821 }
 822
 823 static int __init acpi_parse_apic_instance(char *str)
 824 {
 825         if (!str)
 826                 return -EINVAL;
 827
 828         if (kstrtoint(str, 0, &acpi_apic_instance))
 829                 return -EINVAL;
 830
 831         pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
 832
 833         return 0;
 834 }
 835 early_param("acpi_apic_instance", acpi_parse_apic_instance);
 836
 837 static int __init acpi_force_table_verification_setup(char *s)
 838 {
 839         acpi_verify_table_checksum = true;
 840
 841         return 0;
 842 }
 843 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
 844
 845 static int __init acpi_force_32bit_fadt_addr(char *s)
 846 {
 847         pr_info("Forcing 32 Bit FADT addresses\n");
 848         acpi_gbl_use32_bit_fadt_addresses = TRUE;
 849
 850         return 0;
 851 }
 852 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);