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         ACPI_SUBTABLE_PRMT,
  43 };
  44
  45 struct acpi_subtable_entry {
  46         union acpi_subtable_headers *hdr;
  47         enum acpi_subtable_type type;
  48 };
  49
  50 /*
  51  * Disable table checksum verification for the early stage due to the size
  52  * limitation of the current x86 early mapping implementation.
  53  */
  54 static bool acpi_verify_table_checksum __initdata = false;
  55
  56 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
  57 {
  58         if (!header)
  59                 return;
  60
  61         switch (header->type) {
  62
  63         case ACPI_MADT_TYPE_LOCAL_APIC:
  64                 {
  65                         struct acpi_madt_local_apic *p =
  66                             (struct acpi_madt_local_apic *)header;
  67                         pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
  68                                  p->processor_id, p->id,
  69                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  70                 }
  71                 break;
  72
  73         case ACPI_MADT_TYPE_LOCAL_X2APIC:
  74                 {
  75                         struct acpi_madt_local_x2apic *p =
  76                             (struct acpi_madt_local_x2apic *)header;
  77                         pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
  78                                  p->local_apic_id, p->uid,
  79                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  80                 }
  81                 break;
  82
  83         case ACPI_MADT_TYPE_IO_APIC:
  84                 {
  85                         struct acpi_madt_io_apic *p =
  86                             (struct acpi_madt_io_apic *)header;
  87                         pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
  88                                  p->id, p->address, p->global_irq_base);
  89                 }
  90                 break;
  91
  92         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  93                 {
  94                         struct acpi_madt_interrupt_override *p =
  95                             (struct acpi_madt_interrupt_override *)header;
  96                         pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
  97                                 p->bus, p->source_irq, p->global_irq,
  98                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
  99                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
 100                         if (p->inti_flags  &
 101                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
 102                                 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
 103                                         p->inti_flags  &
 104                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
 105                 }
 106                 break;
 107
 108         case ACPI_MADT_TYPE_NMI_SOURCE:
 109                 {
 110                         struct acpi_madt_nmi_source *p =
 111                             (struct acpi_madt_nmi_source *)header;
 112                         pr_info("NMI_SRC (%s %s global_irq %d)\n",
 113                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 114                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 115                                 p->global_irq);
 116                 }
 117                 break;
 118
 119         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 120                 {
 121                         struct acpi_madt_local_apic_nmi *p =
 122                             (struct acpi_madt_local_apic_nmi *)header;
 123                         pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 124                                 p->processor_id,
 125                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
 126                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 127                                 p->lint);
 128                 }
 129                 break;
 130
 131         case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
 132                 {
 133                         u16 polarity, trigger;
 134                         struct acpi_madt_local_x2apic_nmi *p =
 135                             (struct acpi_madt_local_x2apic_nmi *)header;
 136
 137                         polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
 138                         trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 139
 140                         pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
 141                                 p->uid,
 142                                 mps_inti_flags_polarity[polarity],
 143                                 mps_inti_flags_trigger[trigger],
 144                                 p->lint);
 145                 }
 146                 break;
 147
 148         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 149                 {
 150                         struct acpi_madt_local_apic_override *p =
 151                             (struct acpi_madt_local_apic_override *)header;
 152                         pr_info("LAPIC_ADDR_OVR (address[%p])\n",
 153                                 (void *)(unsigned long)p->address);
 154                 }
 155                 break;
 156
 157         case ACPI_MADT_TYPE_IO_SAPIC:
 158                 {
 159                         struct acpi_madt_io_sapic *p =
 160                             (struct acpi_madt_io_sapic *)header;
 161                         pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 162                                  p->id, (void *)(unsigned long)p->address,
 163                                  p->global_irq_base);
 164                 }
 165                 break;
 166
 167         case ACPI_MADT_TYPE_LOCAL_SAPIC:
 168                 {
 169                         struct acpi_madt_local_sapic *p =
 170                             (struct acpi_madt_local_sapic *)header;
 171                         pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 172                                  p->processor_id, p->id, p->eid,
 173                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 174                 }
 175                 break;
 176
 177         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
 178                 {
 179                         struct acpi_madt_interrupt_source *p =
 180                             (struct acpi_madt_interrupt_source *)header;
 181                         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",
 182                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 183                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 184                                 p->type, p->id, p->eid, p->io_sapic_vector,
 185                                 p->global_irq);
 186                 }
 187                 break;
 188
 189         case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
 190                 {
 191                         struct acpi_madt_generic_interrupt *p =
 192                                 (struct acpi_madt_generic_interrupt *)header;
 193                         pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
 194                                  p->uid, p->base_address,
 195                                  p->arm_mpidr,
 196                                  (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 197
 198                 }
 199                 break;
 200
 201         case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
 202                 {
 203                         struct acpi_madt_generic_distributor *p =
 204                                 (struct acpi_madt_generic_distributor *)header;
 205                         pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
 206                                  p->gic_id, p->base_address,
 207                                  p->global_irq_base);
 208                 }
 209                 break;
 210
 211         default:
 212                 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
 213                         header->type);
 214                 break;
 215         }
 216 }
 217
 218 static unsigned long __init
 219 acpi_get_entry_type(struct acpi_subtable_entry *entry)
 220 {
 221         switch (entry->type) {
 222         case ACPI_SUBTABLE_COMMON:
 223                 return entry->hdr->common.type;
 224         case ACPI_SUBTABLE_HMAT:
 225                 return entry->hdr->hmat.type;
 226         case ACPI_SUBTABLE_PRMT:
 227                 return 0;
 228         }
 229         return 0;
 230 }
 231
 232 static unsigned long __init
 233 acpi_get_entry_length(struct acpi_subtable_entry *entry)
 234 {
 235         switch (entry->type) {
 236         case ACPI_SUBTABLE_COMMON:
 237                 return entry->hdr->common.length;
 238         case ACPI_SUBTABLE_HMAT:
 239                 return entry->hdr->hmat.length;
 240         case ACPI_SUBTABLE_PRMT:
 241                 return entry->hdr->prmt.length;
 242         }
 243         return 0;
 244 }
 245
 246 static unsigned long __init
 247 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
 248 {
 249         switch (entry->type) {
 250         case ACPI_SUBTABLE_COMMON:
 251                 return sizeof(entry->hdr->common);
 252         case ACPI_SUBTABLE_HMAT:
 253                 return sizeof(entry->hdr->hmat);
 254         case ACPI_SUBTABLE_PRMT:
 255                 return sizeof(entry->hdr->prmt);
 256         }
 257         return 0;
 258 }
 259
 260 static enum acpi_subtable_type __init
 261 acpi_get_subtable_type(char *id)
 262 {
 263         if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
 264                 return ACPI_SUBTABLE_HMAT;
 265         if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
 266                 return ACPI_SUBTABLE_PRMT;
 267         return ACPI_SUBTABLE_COMMON;
 268 }
 269
 270 /**
 271  * acpi_parse_entries_array - for each proc_num find a suitable subtable
 272  *
 273  * @id: table id (for debugging purposes)
 274  * @table_size: size of the root table
 275  * @table_header: where does the table start?
 276  * @proc: array of acpi_subtable_proc struct containing entry id
 277  *        and associated handler with it
 278  * @proc_num: how big proc is?
 279  * @max_entries: how many entries can we process?
 280  *
 281  * For each proc_num find a subtable with proc->id and run proc->handler
 282  * on it. Assumption is that there's only single handler for particular
 283  * entry id.
 284  *
 285  * The table_size is not the size of the complete ACPI table (the length
 286  * field in the header struct), but only the size of the root table; i.e.,
 287  * the offset from the very first byte of the complete ACPI table, to the
 288  * first byte of the very first subtable.
 289  *
 290  * On success returns sum of all matching entries for all proc handlers.
 291  * Otherwise, -ENODEV or -EINVAL is returned.
 292  */
 293 static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
 294                 struct acpi_table_header *table_header,
 295                 struct acpi_subtable_proc *proc, int proc_num,
 296                 unsigned int max_entries)
 297 {
 298         struct acpi_subtable_entry entry;
 299         unsigned long table_end, subtable_len, entry_len;
 300         int count = 0;
 301         int errs = 0;
 302         int i;
 303
 304         table_end = (unsigned long)table_header + table_header->length;
 305
 306         /* Parse all entries looking for a match. */
 307
 308         entry.type = acpi_get_subtable_type(id);
 309         entry.hdr = (union acpi_subtable_headers *)
 310             ((unsigned long)table_header + table_size);
 311         subtable_len = acpi_get_subtable_header_length(&entry);
 312
 313         while (((unsigned long)entry.hdr) + subtable_len  < table_end) {
 314                 if (max_entries && count >= max_entries)
 315                         break;
 316
 317                 for (i = 0; i < proc_num; i++) {
 318                         if (acpi_get_entry_type(&entry) != proc[i].id)
 319                                 continue;
 320                         if (!proc[i].handler ||
 321                              (!errs && proc[i].handler(entry.hdr, table_end))) {
 322                                 errs++;
 323                                 continue;
 324                         }
 325
 326                         proc[i].count++;
 327                         break;
 328                 }
 329                 if (i != proc_num)
 330                         count++;
 331
 332                 /*
 333                  * If entry->length is 0, break from this loop to avoid
 334                  * infinite loop.
 335                  */
 336                 entry_len = acpi_get_entry_length(&entry);
 337                 if (entry_len == 0) {
 338                         pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
 339                         return -EINVAL;
 340                 }
 341
 342                 entry.hdr = (union acpi_subtable_headers *)
 343                     ((unsigned long)entry.hdr + entry_len);
 344         }
 345
 346         if (max_entries && count > max_entries) {
 347                 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
 348                         id, proc->id, count);
 349         }
 350
 351         return errs ? -EINVAL : count;
 352 }
 353
 354 int __init acpi_table_parse_entries_array(char *id,
 355                          unsigned long table_size,
 356                          struct acpi_subtable_proc *proc, int proc_num,
 357                          unsigned int max_entries)
 358 {
 359         struct acpi_table_header *table_header = NULL;
 360         int count;
 361         u32 instance = 0;
 362
 363         if (acpi_disabled)
 364                 return -ENODEV;
 365
 366         if (!id)
 367                 return -EINVAL;
 368
 369         if (!table_size)
 370                 return -EINVAL;
 371
 372         if (!strncmp(id, ACPI_SIG_MADT, 4))
 373                 instance = acpi_apic_instance;
 374
 375         acpi_get_table(id, instance, &table_header);
 376         if (!table_header) {
 377                 pr_warn("%4.4s not present\n", id);
 378                 return -ENODEV;
 379         }
 380
 381         count = acpi_parse_entries_array(id, table_size, table_header,
 382                         proc, proc_num, max_entries);
 383
 384         acpi_put_table(table_header);
 385         return count;
 386 }
 387
 388 int __init acpi_table_parse_entries(char *id,
 389                         unsigned long table_size,
 390                         int entry_id,
 391                         acpi_tbl_entry_handler handler,
 392                         unsigned int max_entries)
 393 {
 394         struct acpi_subtable_proc proc = {
 395                 .id             = entry_id,
 396                 .handler        = handler,
 397         };
 398
 399         return acpi_table_parse_entries_array(id, table_size, &proc, 1,
 400                                                 max_entries);
 401 }
 402
 403 int __init acpi_table_parse_madt(enum acpi_madt_type id,
 404                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 405 {
 406         return acpi_table_parse_entries(ACPI_SIG_MADT,
 407                                             sizeof(struct acpi_table_madt), id,
 408                                             handler, max_entries);
 409 }
 410
 411 /**
 412  * acpi_table_parse - find table with @id, run @handler on it
 413  * @id: table id to find
 414  * @handler: handler to run
 415  *
 416  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 417  * run @handler on it.
 418  *
 419  * Return 0 if table found, -errno if not.
 420  */
 421 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
 422 {
 423         struct acpi_table_header *table = NULL;
 424
 425         if (acpi_disabled)
 426                 return -ENODEV;
 427
 428         if (!id || !handler)
 429                 return -EINVAL;
 430
 431         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
 432                 acpi_get_table(id, acpi_apic_instance, &table);
 433         else
 434                 acpi_get_table(id, 0, &table);
 435
 436         if (table) {
 437                 handler(table);
 438                 acpi_put_table(table);
 439                 return 0;
 440         } else
 441                 return -ENODEV;
 442 }
 443
 444 /*
 445  * The BIOS is supposed to supply a single APIC/MADT,
 446  * but some report two.  Provide a knob to use either.
 447  * (don't you wish instance 0 and 1 were not the same?)
 448  */
 449 static void __init check_multiple_madt(void)
 450 {
 451         struct acpi_table_header *table = NULL;
 452
 453         acpi_get_table(ACPI_SIG_MADT, 2, &table);
 454         if (table) {
 455                 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
 456                         acpi_apic_instance);
 457                 pr_warn("If \"acpi_apic_instance=%d\" works better, "
 458                         "notify linux-acpi@vger.kernel.org\n",
 459                         acpi_apic_instance ? 0 : 2);
 460                 acpi_put_table(table);
 461
 462         } else
 463                 acpi_apic_instance = 0;
 464
 465         return;
 466 }
 467
 468 static void acpi_table_taint(struct acpi_table_header *table)
 469 {
 470         pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 471                 table->signature, table->oem_table_id);
 472         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 473 }
 474
 475 #ifdef CONFIG_ACPI_TABLE_UPGRADE
 476 static u64 acpi_tables_addr;
 477 static int all_tables_size;
 478
 479 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 480 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 481 {
 482         u8 sum = 0;
 483         u8 *end = buffer + length;
 484
 485         while (buffer < end)
 486                 sum = (u8) (sum + *(buffer++));
 487         return sum;
 488 }
 489
 490 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 491 static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
 492         ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
 493         ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
 494         ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
 495         ACPI_SIG_ASF,  ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
 496         ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
 497         ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
 498         ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
 499         ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
 500         ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
 501         ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
 502         ACPI_SIG_NHLT };
 503
 504 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 505
 506 #define NR_ACPI_INITRD_TABLES 64
 507 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
 508 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
 509
 510 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 511
 512 void __init acpi_table_upgrade(void)
 513 {
 514         void *data;
 515         size_t size;
 516         int sig, no, table_nr = 0, total_offset = 0;
 517         long offset = 0;
 518         struct acpi_table_header *table;
 519         char cpio_path[32] = "kernel/firmware/acpi/";
 520         struct cpio_data file;
 521
 522         if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
 523                 data = __initramfs_start;
 524                 size = __initramfs_size;
 525         } else {
 526                 data = (void *)initrd_start;
 527                 size = initrd_end - initrd_start;
 528         }
 529
 530         if (data == NULL || size == 0)
 531                 return;
 532
 533         for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
 534                 file = find_cpio_data(cpio_path, data, size, &offset);
 535                 if (!file.data)
 536                         break;
 537
 538                 data += offset;
 539                 size -= offset;
 540
 541                 if (file.size < sizeof(struct acpi_table_header)) {
 542                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 543                                 cpio_path, file.name);
 544                         continue;
 545                 }
 546
 547                 table = file.data;
 548
 549                 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
 550                         if (!memcmp(table->signature, table_sigs[sig], 4))
 551                                 break;
 552
 553                 if (sig >= ARRAY_SIZE(table_sigs)) {
 554                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 555                                 cpio_path, file.name);
 556                         continue;
 557                 }
 558                 if (file.size != table->length) {
 559                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 560                                 cpio_path, file.name);
 561                         continue;
 562                 }
 563                 if (acpi_table_checksum(file.data, table->length)) {
 564                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 565                                 cpio_path, file.name);
 566                         continue;
 567                 }
 568
 569                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 570                         table->signature, cpio_path, file.name, table->length);
 571
 572                 all_tables_size += table->length;
 573                 acpi_initrd_files[table_nr].data = file.data;
 574                 acpi_initrd_files[table_nr].size = file.size;
 575                 table_nr++;
 576         }
 577         if (table_nr == 0)
 578                 return;
 579
 580         if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
 581                 pr_notice("kernel is locked down, ignoring table override\n");
 582                 return;
 583         }
 584
 585         acpi_tables_addr =
 586                 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
 587                                        all_tables_size, PAGE_SIZE);
 588         if (!acpi_tables_addr) {
 589                 WARN_ON(1);
 590                 return;
 591         }
 592         /*
 593          * Only calling e820_add_reserve does not work and the
 594          * tables are invalid (memory got used) later.
 595          * memblock_reserve works as expected and the tables won't get modified.
 596          * But it's not enough on X86 because ioremap will
 597          * complain later (used by acpi_os_map_memory) that the pages
 598          * that should get mapped are not marked "reserved".
 599          * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
 600          * works fine.
 601          */
 602         memblock_reserve(acpi_tables_addr, all_tables_size);
 603         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 604
 605         /*
 606          * early_ioremap only can remap 256k one time. If we map all
 607          * tables one time, we will hit the limit. Need to map chunks
 608          * one by one during copying the same as that in relocate_initrd().
 609          */
 610         for (no = 0; no < table_nr; no++) {
 611                 unsigned char *src_p = acpi_initrd_files[no].data;
 612                 phys_addr_t size = acpi_initrd_files[no].size;
 613                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 614                 phys_addr_t slop, clen;
 615                 char *dest_p;
 616
 617                 total_offset += size;
 618
 619                 while (size) {
 620                         slop = dest_addr & ~PAGE_MASK;
 621                         clen = size;
 622                         if (clen > MAP_CHUNK_SIZE - slop)
 623                                 clen = MAP_CHUNK_SIZE - slop;
 624                         dest_p = early_memremap(dest_addr & PAGE_MASK,
 625                                                 clen + slop);
 626                         memcpy(dest_p + slop, src_p, clen);
 627                         early_memunmap(dest_p, clen + slop);
 628                         src_p += clen;
 629                         dest_addr += clen;
 630                         size -= clen;
 631                 }
 632         }
 633 }
 634
 635 static acpi_status
 636 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 637                            acpi_physical_address *address, u32 *length)
 638 {
 639         int table_offset = 0;
 640         int table_index = 0;
 641         struct acpi_table_header *table;
 642         u32 table_length;
 643
 644         *length = 0;
 645         *address = 0;
 646         if (!acpi_tables_addr)
 647                 return AE_OK;
 648
 649         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 650                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 651                                            ACPI_HEADER_SIZE);
 652                 if (table_offset + table->length > all_tables_size) {
 653                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 654                         WARN_ON(1);
 655                         return AE_OK;
 656                 }
 657
 658                 table_length = table->length;
 659
 660                 /* Only override tables matched */
 661                 if (memcmp(existing_table->signature, table->signature, 4) ||
 662                     memcmp(table->oem_id, existing_table->oem_id,
 663                            ACPI_OEM_ID_SIZE) ||
 664                     memcmp(table->oem_table_id, existing_table->oem_table_id,
 665                            ACPI_OEM_TABLE_ID_SIZE)) {
 666                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 667                         goto next_table;
 668                 }
 669                 /*
 670                  * Mark the table to avoid being used in
 671                  * acpi_table_initrd_scan() and check the revision.
 672                  */
 673                 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
 674                     existing_table->oem_revision >= table->oem_revision) {
 675                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 676                         goto next_table;
 677                 }
 678
 679                 *length = table_length;
 680                 *address = acpi_tables_addr + table_offset;
 681                 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
 682                         table->signature, table->oem_id,
 683                         table->oem_table_id);
 684                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 685                 break;
 686
 687 next_table:
 688                 table_offset += table_length;
 689                 table_index++;
 690         }
 691         return AE_OK;
 692 }
 693
 694 static void __init acpi_table_initrd_scan(void)
 695 {
 696         int table_offset = 0;
 697         int table_index = 0;
 698         u32 table_length;
 699         struct acpi_table_header *table;
 700
 701         if (!acpi_tables_addr)
 702                 return;
 703
 704         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 705                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 706                                            ACPI_HEADER_SIZE);
 707                 if (table_offset + table->length > all_tables_size) {
 708                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 709                         WARN_ON(1);
 710                         return;
 711                 }
 712
 713                 table_length = table->length;
 714
 715                 /* Skip RSDT/XSDT which should only be used for override */
 716                 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
 717                     ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
 718                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 719                         goto next_table;
 720                 }
 721                 /*
 722                  * Mark the table to avoid being used in
 723                  * acpi_table_initrd_override(). Though this is not possible
 724                  * because override is disabled in acpi_install_table().
 725                  */
 726                 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
 727                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 728                         goto next_table;
 729                 }
 730
 731                 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
 732                         table->signature, table->oem_id,
 733                         table->oem_table_id);
 734                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 735                 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
 736 next_table:
 737                 table_offset += table_length;
 738                 table_index++;
 739         }
 740 }
 741 #else
 742 static acpi_status
 743 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 744                            acpi_physical_address *address,
 745                            u32 *table_length)
 746 {
 747         *table_length = 0;
 748         *address = 0;
 749         return AE_OK;
 750 }
 751
 752 static void __init acpi_table_initrd_scan(void)
 753 {
 754 }
 755 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
 756
 757 acpi_status
 758 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 759                                 acpi_physical_address *address,
 760                                 u32 *table_length)
 761 {
 762         return acpi_table_initrd_override(existing_table, address,
 763                                           table_length);
 764 }
 765
 766 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 767 static void *amlcode __attribute__ ((weakref("AmlCode")));
 768 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
 769 #endif
 770
 771 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
 772                        struct acpi_table_header **new_table)
 773 {
 774         if (!existing_table || !new_table)
 775                 return AE_BAD_PARAMETER;
 776
 777         *new_table = NULL;
 778
 779 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 780         if (!strncmp(existing_table->signature, "DSDT", 4)) {
 781                 *new_table = (struct acpi_table_header *)&amlcode;
 782                 if (!(*new_table))
 783                         *new_table = (struct acpi_table_header *)&dsdt_amlcode;
 784         }
 785 #endif
 786         if (*new_table != NULL)
 787                 acpi_table_taint(existing_table);
 788         return AE_OK;
 789 }
 790
 791 /*
 792  * acpi_locate_initial_tables()
 793  *
 794  * find RSDP, find and checksum SDT/XSDT.
 795  * checksum all tables, print SDT/XSDT
 796  *
 797  * result: sdt_entry[] is initialized
 798  */
 799
 800 int __init acpi_locate_initial_tables(void)
 801 {
 802         acpi_status status;
 803
 804         if (acpi_verify_table_checksum) {
 805                 pr_info("Early table checksum verification enabled\n");
 806                 acpi_gbl_enable_table_validation = TRUE;
 807         } else {
 808                 pr_info("Early table checksum verification disabled\n");
 809                 acpi_gbl_enable_table_validation = FALSE;
 810         }
 811
 812         status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 813         if (ACPI_FAILURE(status))
 814                 return -EINVAL;
 815
 816         return 0;
 817 }
 818
 819 void __init acpi_reserve_initial_tables(void)
 820 {
 821         int i;
 822
 823         for (i = 0; i < ACPI_MAX_TABLES; i++) {
 824                 struct acpi_table_desc *table_desc = &initial_tables[i];
 825                 u64 start = table_desc->address;
 826                 u64 size = table_desc->length;
 827
 828                 if (!start || !size)
 829                         break;
 830
 831                 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
 832                         table_desc->signature.ascii, start, start + size - 1);
 833
 834                 memblock_reserve(start, size);
 835         }
 836 }
 837
 838 void __init acpi_table_init_complete(void)
 839 {
 840         acpi_table_initrd_scan();
 841         check_multiple_madt();
 842 }
 843
 844 int __init acpi_table_init(void)
 845 {
 846         int ret;
 847
 848         ret = acpi_locate_initial_tables();
 849         if (ret)
 850                 return ret;
 851
 852         acpi_table_init_complete();
 853
 854         return 0;
 855 }
 856
 857 static int __init acpi_parse_apic_instance(char *str)
 858 {
 859         if (!str)
 860                 return -EINVAL;
 861
 862         if (kstrtoint(str, 0, &acpi_apic_instance))
 863                 return -EINVAL;
 864
 865         pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
 866
 867         return 0;
 868 }
 869 early_param("acpi_apic_instance", acpi_parse_apic_instance);
 870
 871 static int __init acpi_force_table_verification_setup(char *s)
 872 {
 873         acpi_verify_table_checksum = true;
 874
 875         return 0;
 876 }
 877 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
 878
 879 static int __init acpi_force_32bit_fadt_addr(char *s)
 880 {
 881         pr_info("Forcing 32 Bit FADT addresses\n");
 882         acpi_gbl_use32_bit_fadt_addresses = TRUE;
 883
 884         return 0;
 885 }
 886 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);