drivers/acpi/tables.c

   1 /*
   2  *  acpi_tables.c - ACPI Boot-Time Table Parsing
   3  *
   4  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19  *
  20  */
  21
  22 /* Uncomment next line to get verbose printout */
  23 /* #define DEBUG */
  24 #define pr_fmt(fmt) "ACPI: " fmt
  25
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/smp.h>
  29 #include <linux/string.h>
  30 #include <linux/types.h>
  31 #include <linux/irq.h>
  32 #include <linux/errno.h>
  33 #include <linux/acpi.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/earlycpio.h>
  36 #include <linux/memblock.h>
  37 #include "internal.h"
  38
  39 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  40 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  41 #endif
  42
  43 #define ACPI_MAX_TABLES         128
  44
  45 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
  46 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
  47
  48 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
  49
  50 static int acpi_apic_instance __initdata;
  51
  52 /*
  53  * Disable table checksum verification for the early stage due to the size
  54  * limitation of the current x86 early mapping implementation.
  55  */
  56 static bool acpi_verify_table_checksum __initdata = false;
  57
  58 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
  59 {
  60         if (!header)
  61                 return;
  62
  63         switch (header->type) {
  64
  65         case ACPI_MADT_TYPE_LOCAL_APIC:
  66                 {
  67                         struct acpi_madt_local_apic *p =
  68                             (struct acpi_madt_local_apic *)header;
  69                         pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
  70                                  p->processor_id, p->id,
  71                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  72                 }
  73                 break;
  74
  75         case ACPI_MADT_TYPE_LOCAL_X2APIC:
  76                 {
  77                         struct acpi_madt_local_x2apic *p =
  78                             (struct acpi_madt_local_x2apic *)header;
  79                         pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
  80                                  p->local_apic_id, p->uid,
  81                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  82                 }
  83                 break;
  84
  85         case ACPI_MADT_TYPE_IO_APIC:
  86                 {
  87                         struct acpi_madt_io_apic *p =
  88                             (struct acpi_madt_io_apic *)header;
  89                         pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
  90                                  p->id, p->address, p->global_irq_base);
  91                 }
  92                 break;
  93
  94         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  95                 {
  96                         struct acpi_madt_interrupt_override *p =
  97                             (struct acpi_madt_interrupt_override *)header;
  98                         pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
  99                                 p->bus, p->source_irq, p->global_irq,
 100                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 101                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
 102                         if (p->inti_flags  &
 103                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
 104                                 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
 105                                         p->inti_flags  &
 106                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
 107                 }
 108                 break;
 109
 110         case ACPI_MADT_TYPE_NMI_SOURCE:
 111                 {
 112                         struct acpi_madt_nmi_source *p =
 113                             (struct acpi_madt_nmi_source *)header;
 114                         pr_info("NMI_SRC (%s %s global_irq %d)\n",
 115                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 116                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 117                                 p->global_irq);
 118                 }
 119                 break;
 120
 121         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 122                 {
 123                         struct acpi_madt_local_apic_nmi *p =
 124                             (struct acpi_madt_local_apic_nmi *)header;
 125                         pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 126                                 p->processor_id,
 127                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
 128                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 129                                 p->lint);
 130                 }
 131                 break;
 132
 133         case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
 134                 {
 135                         u16 polarity, trigger;
 136                         struct acpi_madt_local_x2apic_nmi *p =
 137                             (struct acpi_madt_local_x2apic_nmi *)header;
 138
 139                         polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
 140                         trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 141
 142                         pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
 143                                 p->uid,
 144                                 mps_inti_flags_polarity[polarity],
 145                                 mps_inti_flags_trigger[trigger],
 146                                 p->lint);
 147                 }
 148                 break;
 149
 150         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 151                 {
 152                         struct acpi_madt_local_apic_override *p =
 153                             (struct acpi_madt_local_apic_override *)header;
 154                         pr_info("LAPIC_ADDR_OVR (address[%p])\n",
 155                                 (void *)(unsigned long)p->address);
 156                 }
 157                 break;
 158
 159         case ACPI_MADT_TYPE_IO_SAPIC:
 160                 {
 161                         struct acpi_madt_io_sapic *p =
 162                             (struct acpi_madt_io_sapic *)header;
 163                         pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 164                                  p->id, (void *)(unsigned long)p->address,
 165                                  p->global_irq_base);
 166                 }
 167                 break;
 168
 169         case ACPI_MADT_TYPE_LOCAL_SAPIC:
 170                 {
 171                         struct acpi_madt_local_sapic *p =
 172                             (struct acpi_madt_local_sapic *)header;
 173                         pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 174                                  p->processor_id, p->id, p->eid,
 175                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 176                 }
 177                 break;
 178
 179         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
 180                 {
 181                         struct acpi_madt_interrupt_source *p =
 182                             (struct acpi_madt_interrupt_source *)header;
 183                         pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
 184                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 185                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 186                                 p->type, p->id, p->eid, p->io_sapic_vector,
 187                                 p->global_irq);
 188                 }
 189                 break;
 190
 191         case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
 192                 {
 193                         struct acpi_madt_generic_interrupt *p =
 194                                 (struct acpi_madt_generic_interrupt *)header;
 195                         pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
 196                                  p->uid, p->base_address,
 197                                  p->arm_mpidr,
 198                                  (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 199
 200                 }
 201                 break;
 202
 203         case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
 204                 {
 205                         struct acpi_madt_generic_distributor *p =
 206                                 (struct acpi_madt_generic_distributor *)header;
 207                         pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
 208                                  p->gic_id, p->base_address,
 209                                  p->global_irq_base);
 210                 }
 211                 break;
 212
 213         default:
 214                 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
 215                         header->type);
 216                 break;
 217         }
 218 }
 219
 220 /**
 221  * acpi_parse_entries_array - for each proc_num find a suitable subtable
 222  *
 223  * @id: table id (for debugging purposes)
 224  * @table_size: single entry size
 225  * @table_header: where does the table start?
 226  * @proc: array of acpi_subtable_proc struct containing entry id
 227  *        and associated handler with it
 228  * @proc_num: how big proc is?
 229  * @max_entries: how many entries can we process?
 230  *
 231  * For each proc_num find a subtable with proc->id and run proc->handler
 232  * on it. Assumption is that there's only single handler for particular
 233  * entry id.
 234  *
 235  * On success returns sum of all matching entries for all proc handlers.
 236  * Otherwise, -ENODEV or -EINVAL is returned.
 237  */
 238 static int __init
 239 acpi_parse_entries_array(char *id, unsigned long table_size,
 240                 struct acpi_table_header *table_header,
 241                 struct acpi_subtable_proc *proc, int proc_num,
 242                 unsigned int max_entries)
 243 {
 244         struct acpi_subtable_header *entry;
 245         unsigned long table_end;
 246         int count = 0;
 247         int i;
 248
 249         if (acpi_disabled)
 250                 return -ENODEV;
 251
 252         if (!id)
 253                 return -EINVAL;
 254
 255         if (!table_size)
 256                 return -EINVAL;
 257
 258         if (!table_header) {
 259                 pr_warn("%4.4s not present\n", id);
 260                 return -ENODEV;
 261         }
 262
 263         table_end = (unsigned long)table_header + table_header->length;
 264
 265         /* Parse all entries looking for a match. */
 266
 267         entry = (struct acpi_subtable_header *)
 268             ((unsigned long)table_header + table_size);
 269
 270         while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
 271                table_end) {
 272                 if (max_entries && count >= max_entries)
 273                         break;
 274
 275                 for (i = 0; i < proc_num; i++) {
 276                         if (entry->type != proc[i].id)
 277                                 continue;
 278                         if (!proc[i].handler ||
 279                              proc[i].handler(entry, table_end))
 280                                 return -EINVAL;
 281
 282                         proc->count++;
 283                         break;
 284                 }
 285                 if (i != proc_num)
 286                         count++;
 287
 288                 /*
 289                  * If entry->length is 0, break from this loop to avoid
 290                  * infinite loop.
 291                  */
 292                 if (entry->length == 0) {
 293                         pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
 294                         return -EINVAL;
 295                 }
 296
 297                 entry = (struct acpi_subtable_header *)
 298                     ((unsigned long)entry + entry->length);
 299         }
 300
 301         if (max_entries && count > max_entries) {
 302                 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
 303                         id, proc->id, count - max_entries, count);
 304         }
 305
 306         return count;
 307 }
 308
 309 int __init
 310 acpi_parse_entries(char *id,
 311                         unsigned long table_size,
 312                         acpi_tbl_entry_handler handler,
 313                         struct acpi_table_header *table_header,
 314                         int entry_id, unsigned int max_entries)
 315 {
 316         struct acpi_subtable_proc proc = {
 317                 .id             = entry_id,
 318                 .handler        = handler,
 319         };
 320
 321         return acpi_parse_entries_array(id, table_size, table_header,
 322                         &proc, 1, max_entries);
 323 }
 324
 325 int __init
 326 acpi_table_parse_entries_array(char *id,
 327                          unsigned long table_size,
 328                          struct acpi_subtable_proc *proc, int proc_num,
 329                          unsigned int max_entries)
 330 {
 331         struct acpi_table_header *table_header = NULL;
 332         acpi_size tbl_size;
 333         int count;
 334         u32 instance = 0;
 335
 336         if (acpi_disabled)
 337                 return -ENODEV;
 338
 339         if (!id)
 340                 return -EINVAL;
 341
 342         if (!strncmp(id, ACPI_SIG_MADT, 4))
 343                 instance = acpi_apic_instance;
 344
 345         acpi_get_table_with_size(id, instance, &table_header, &tbl_size);
 346         if (!table_header) {
 347                 pr_warn("%4.4s not present\n", id);
 348                 return -ENODEV;
 349         }
 350
 351         count = acpi_parse_entries_array(id, table_size, table_header,
 352                         proc, proc_num, max_entries);
 353
 354         early_acpi_os_unmap_memory((char *)table_header, tbl_size);
 355         return count;
 356 }
 357
 358 int __init
 359 acpi_table_parse_entries(char *id,
 360                         unsigned long table_size,
 361                         int entry_id,
 362                         acpi_tbl_entry_handler handler,
 363                         unsigned int max_entries)
 364 {
 365         struct acpi_subtable_proc proc = {
 366                 .id             = entry_id,
 367                 .handler        = handler,
 368         };
 369
 370         return acpi_table_parse_entries_array(id, table_size, &proc, 1,
 371                                                 max_entries);
 372 }
 373
 374 int __init
 375 acpi_table_parse_madt(enum acpi_madt_type id,
 376                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 377 {
 378         return acpi_table_parse_entries(ACPI_SIG_MADT,
 379                                             sizeof(struct acpi_table_madt), id,
 380                                             handler, max_entries);
 381 }
 382
 383 /**
 384  * acpi_table_parse - find table with @id, run @handler on it
 385  * @id: table id to find
 386  * @handler: handler to run
 387  *
 388  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 389  * run @handler on it.
 390  *
 391  * Return 0 if table found, -errno if not.
 392  */
 393 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
 394 {
 395         struct acpi_table_header *table = NULL;
 396         acpi_size tbl_size;
 397
 398         if (acpi_disabled)
 399                 return -ENODEV;
 400
 401         if (!id || !handler)
 402                 return -EINVAL;
 403
 404         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
 405                 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
 406         else
 407                 acpi_get_table_with_size(id, 0, &table, &tbl_size);
 408
 409         if (table) {
 410                 handler(table);
 411                 early_acpi_os_unmap_memory(table, tbl_size);
 412                 return 0;
 413         } else
 414                 return -ENODEV;
 415 }
 416
 417 /*
 418  * The BIOS is supposed to supply a single APIC/MADT,
 419  * but some report two.  Provide a knob to use either.
 420  * (don't you wish instance 0 and 1 were not the same?)
 421  */
 422 static void __init check_multiple_madt(void)
 423 {
 424         struct acpi_table_header *table = NULL;
 425         acpi_size tbl_size;
 426
 427         acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
 428         if (table) {
 429                 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
 430                         acpi_apic_instance);
 431                 pr_warn("If \"acpi_apic_instance=%d\" works better, "
 432                         "notify linux-acpi@vger.kernel.org\n",
 433                         acpi_apic_instance ? 0 : 2);
 434                 early_acpi_os_unmap_memory(table, tbl_size);
 435
 436         } else
 437                 acpi_apic_instance = 0;
 438
 439         return;
 440 }
 441
 442 static void acpi_table_taint(struct acpi_table_header *table)
 443 {
 444         pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
 445                 table->signature, table->oem_table_id);
 446         add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 447 }
 448
 449 #ifdef CONFIG_ACPI_TABLE_UPGRADE
 450 static u64 acpi_tables_addr;
 451 static int all_tables_size;
 452
 453 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
 454 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
 455 {
 456         u8 sum = 0;
 457         u8 *end = buffer + length;
 458
 459         while (buffer < end)
 460                 sum = (u8) (sum + *(buffer++));
 461         return sum;
 462 }
 463
 464 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
 465 static const char * const table_sigs[] = {
 466         ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
 467         ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
 468         ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
 469         ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
 470         ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
 471         ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
 472         ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
 473         ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
 474         ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
 475
 476 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 477
 478 #define NR_ACPI_INITRD_TABLES 64
 479 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
 480 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
 481
 482 #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
 483
 484 static void __init acpi_table_initrd_init(void *data, size_t size)
 485 {
 486         int sig, no, table_nr = 0, total_offset = 0;
 487         long offset = 0;
 488         struct acpi_table_header *table;
 489         char cpio_path[32] = "kernel/firmware/acpi/";
 490         struct cpio_data file;
 491
 492         if (data == NULL || size == 0)
 493                 return;
 494
 495         for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
 496                 file = find_cpio_data(cpio_path, data, size, &offset);
 497                 if (!file.data)
 498                         break;
 499
 500                 data += offset;
 501                 size -= offset;
 502
 503                 if (file.size < sizeof(struct acpi_table_header)) {
 504                         pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
 505                                 cpio_path, file.name);
 506                         continue;
 507                 }
 508
 509                 table = file.data;
 510
 511                 for (sig = 0; table_sigs[sig]; sig++)
 512                         if (!memcmp(table->signature, table_sigs[sig], 4))
 513                                 break;
 514
 515                 if (!table_sigs[sig]) {
 516                         pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
 517                                 cpio_path, file.name);
 518                         continue;
 519                 }
 520                 if (file.size != table->length) {
 521                         pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
 522                                 cpio_path, file.name);
 523                         continue;
 524                 }
 525                 if (acpi_table_checksum(file.data, table->length)) {
 526                         pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
 527                                 cpio_path, file.name);
 528                         continue;
 529                 }
 530
 531                 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
 532                         table->signature, cpio_path, file.name, table->length);
 533
 534                 all_tables_size += table->length;
 535                 acpi_initrd_files[table_nr].data = file.data;
 536                 acpi_initrd_files[table_nr].size = file.size;
 537                 table_nr++;
 538         }
 539         if (table_nr == 0)
 540                 return;
 541
 542         acpi_tables_addr =
 543                 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
 544                                        all_tables_size, PAGE_SIZE);
 545         if (!acpi_tables_addr) {
 546                 WARN_ON(1);
 547                 return;
 548         }
 549         /*
 550          * Only calling e820_add_reserve does not work and the
 551          * tables are invalid (memory got used) later.
 552          * memblock_reserve works as expected and the tables won't get modified.
 553          * But it's not enough on X86 because ioremap will
 554          * complain later (used by acpi_os_map_memory) that the pages
 555          * that should get mapped are not marked "reserved".
 556          * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 557          * works fine.
 558          */
 559         memblock_reserve(acpi_tables_addr, all_tables_size);
 560         arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 561
 562         /*
 563          * early_ioremap only can remap 256k one time. If we map all
 564          * tables one time, we will hit the limit. Need to map chunks
 565          * one by one during copying the same as that in relocate_initrd().
 566          */
 567         for (no = 0; no < table_nr; no++) {
 568                 unsigned char *src_p = acpi_initrd_files[no].data;
 569                 phys_addr_t size = acpi_initrd_files[no].size;
 570                 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
 571                 phys_addr_t slop, clen;
 572                 char *dest_p;
 573
 574                 total_offset += size;
 575
 576                 while (size) {
 577                         slop = dest_addr & ~PAGE_MASK;
 578                         clen = size;
 579                         if (clen > MAP_CHUNK_SIZE - slop)
 580                                 clen = MAP_CHUNK_SIZE - slop;
 581                         dest_p = early_ioremap(dest_addr & PAGE_MASK,
 582                                                  clen + slop);
 583                         memcpy(dest_p + slop, src_p, clen);
 584                         early_iounmap(dest_p, clen + slop);
 585                         src_p += clen;
 586                         dest_addr += clen;
 587                         size -= clen;
 588                 }
 589         }
 590 }
 591
 592 static acpi_status
 593 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 594                            acpi_physical_address *address, u32 *length)
 595 {
 596         int table_offset = 0;
 597         int table_index = 0;
 598         struct acpi_table_header *table;
 599         u32 table_length;
 600
 601         *length = 0;
 602         *address = 0;
 603         if (!acpi_tables_addr)
 604                 return AE_OK;
 605
 606         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 607                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 608                                            ACPI_HEADER_SIZE);
 609                 if (table_offset + table->length > all_tables_size) {
 610                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 611                         WARN_ON(1);
 612                         return AE_OK;
 613                 }
 614
 615                 table_length = table->length;
 616
 617                 /* Only override tables matched */
 618                 if (memcmp(existing_table->signature, table->signature, 4) ||
 619                     memcmp(table->oem_id, existing_table->oem_id,
 620                            ACPI_OEM_ID_SIZE) ||
 621                     memcmp(table->oem_table_id, existing_table->oem_table_id,
 622                            ACPI_OEM_TABLE_ID_SIZE)) {
 623                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 624                         goto next_table;
 625                 }
 626                 /*
 627                  * Mark the table to avoid being used in
 628                  * acpi_table_initrd_scan() and check the revision.
 629                  */
 630                 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
 631                     existing_table->oem_revision >= table->oem_revision) {
 632                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 633                         goto next_table;
 634                 }
 635
 636                 *length = table_length;
 637                 *address = acpi_tables_addr + table_offset;
 638                 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
 639                         table->signature, table->oem_id,
 640                         table->oem_table_id);
 641                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 642                 break;
 643
 644 next_table:
 645                 table_offset += table_length;
 646                 table_index++;
 647         }
 648         return AE_OK;
 649 }
 650
 651 static void __init acpi_table_initrd_scan(void)
 652 {
 653         int table_offset = 0;
 654         int table_index = 0;
 655         u32 table_length;
 656         struct acpi_table_header *table;
 657
 658         if (!acpi_tables_addr)
 659                 return;
 660
 661         while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
 662                 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
 663                                            ACPI_HEADER_SIZE);
 664                 if (table_offset + table->length > all_tables_size) {
 665                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 666                         WARN_ON(1);
 667                         return;
 668                 }
 669
 670                 table_length = table->length;
 671
 672                 /* Skip RSDT/XSDT which should only be used for override */
 673                 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
 674                     ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
 675                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 676                         goto next_table;
 677                 }
 678                 /*
 679                  * Mark the table to avoid being used in
 680                  * acpi_table_initrd_override(). Though this is not possible
 681                  * because override is disabled in acpi_install_table().
 682                  */
 683                 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
 684                         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 685                         goto next_table;
 686                 }
 687
 688                 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
 689                         table->signature, table->oem_id,
 690                         table->oem_table_id);
 691                 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
 692                 acpi_install_table(acpi_tables_addr + table_offset, TRUE);
 693 next_table:
 694                 table_offset += table_length;
 695                 table_index++;
 696         }
 697 }
 698 #else
 699 static void __init acpi_table_initrd_init(void *data, size_t size)
 700 {
 701 }
 702
 703 static acpi_status
 704 acpi_table_initrd_override(struct acpi_table_header *existing_table,
 705                            acpi_physical_address *address,
 706                            u32 *table_length)
 707 {
 708         *table_length = 0;
 709         *address = 0;
 710         return AE_OK;
 711 }
 712
 713 static void __init acpi_table_initrd_scan(void)
 714 {
 715 }
 716 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
 717
 718 acpi_status
 719 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 720                                 acpi_physical_address *address,
 721                                 u32 *table_length)
 722 {
 723         return acpi_table_initrd_override(existing_table, address,
 724                                           table_length);
 725 }
 726
 727 acpi_status
 728 acpi_os_table_override(struct acpi_table_header *existing_table,
 729                        struct acpi_table_header **new_table)
 730 {
 731         if (!existing_table || !new_table)
 732                 return AE_BAD_PARAMETER;
 733
 734         *new_table = NULL;
 735
 736 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 737         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 738                 *new_table = (struct acpi_table_header *)AmlCode;
 739 #endif
 740         if (*new_table != NULL)
 741                 acpi_table_taint(existing_table);
 742         return AE_OK;
 743 }
 744
 745 void __init early_acpi_table_init(void *data, size_t size)
 746 {
 747         acpi_table_initrd_init(data, size);
 748 }
 749
 750 /*
 751  * acpi_table_init()
 752  *
 753  * find RSDP, find and checksum SDT/XSDT.
 754  * checksum all tables, print SDT/XSDT
 755  *
 756  * result: sdt_entry[] is initialized
 757  */
 758
 759 int __init acpi_table_init(void)
 760 {
 761         acpi_status status;
 762
 763         if (acpi_verify_table_checksum) {
 764                 pr_info("Early table checksum verification enabled\n");
 765                 acpi_gbl_verify_table_checksum = TRUE;
 766         } else {
 767                 pr_info("Early table checksum verification disabled\n");
 768                 acpi_gbl_verify_table_checksum = FALSE;
 769         }
 770
 771         status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 772         if (ACPI_FAILURE(status))
 773                 return -EINVAL;
 774         acpi_table_initrd_scan();
 775
 776         check_multiple_madt();
 777         return 0;
 778 }
 779
 780 static int __init acpi_parse_apic_instance(char *str)
 781 {
 782         if (!str)
 783                 return -EINVAL;
 784
 785         if (kstrtoint(str, 0, &acpi_apic_instance))
 786                 return -EINVAL;
 787
 788         pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
 789
 790         return 0;
 791 }
 792
 793 early_param("acpi_apic_instance", acpi_parse_apic_instance);
 794
 795 static int __init acpi_force_table_verification_setup(char *s)
 796 {
 797         acpi_verify_table_checksum = true;
 798
 799         return 0;
 800 }
 801
 802 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
 803
 804 static int __init acpi_force_32bit_fadt_addr(char *s)
 805 {
 806         pr_info("Forcing 32 Bit FADT addresses\n");
 807         acpi_gbl_use32_bit_fadt_addresses = TRUE;
 808
 809         return 0;
 810 }
 811
 812 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);