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