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_table_parse_entries_array(char *id, 315 unsigned long table_size, 316 struct acpi_subtable_proc *proc, int proc_num, 317 unsigned int max_entries) 318 { 319 struct acpi_table_header *table_header = NULL; 320 int count; 321 u32 instance = 0; 322 323 if (acpi_disabled) 324 return -ENODEV; 325 326 if (!id) 327 return -EINVAL; 328 329 if (!strncmp(id, ACPI_SIG_MADT, 4)) 330 instance = acpi_apic_instance; 331 332 acpi_get_table(id, instance, &table_header); 333 if (!table_header) { 334 pr_warn("%4.4s not present\n", id); 335 return -ENODEV; 336 } 337 338 count = acpi_parse_entries_array(id, table_size, table_header, 339 proc, proc_num, max_entries); 340 341 acpi_put_table(table_header); 342 return count; 343 } 344 345 int __init 346 acpi_table_parse_entries(char *id, 347 unsigned long table_size, 348 int entry_id, 349 acpi_tbl_entry_handler handler, 350 unsigned int max_entries) 351 { 352 struct acpi_subtable_proc proc = { 353 .id = entry_id, 354 .handler = handler, 355 }; 356 357 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 358 max_entries); 359 } 360 361 int __init 362 acpi_table_parse_madt(enum acpi_madt_type id, 363 acpi_tbl_entry_handler handler, unsigned int max_entries) 364 { 365 return acpi_table_parse_entries(ACPI_SIG_MADT, 366 sizeof(struct acpi_table_madt), id, 367 handler, max_entries); 368 } 369 370 /** 371 * acpi_table_parse - find table with @id, run @handler on it 372 * @id: table id to find 373 * @handler: handler to run 374 * 375 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 376 * run @handler on it. 377 * 378 * Return 0 if table found, -errno if not. 379 */ 380 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 381 { 382 struct acpi_table_header *table = NULL; 383 384 if (acpi_disabled) 385 return -ENODEV; 386 387 if (!id || !handler) 388 return -EINVAL; 389 390 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 391 acpi_get_table(id, acpi_apic_instance, &table); 392 else 393 acpi_get_table(id, 0, &table); 394 395 if (table) { 396 handler(table); 397 acpi_put_table(table); 398 return 0; 399 } else 400 return -ENODEV; 401 } 402 403 /* 404 * The BIOS is supposed to supply a single APIC/MADT, 405 * but some report two. Provide a knob to use either. 406 * (don't you wish instance 0 and 1 were not the same?) 407 */ 408 static void __init check_multiple_madt(void) 409 { 410 struct acpi_table_header *table = NULL; 411 412 acpi_get_table(ACPI_SIG_MADT, 2, &table); 413 if (table) { 414 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 415 acpi_apic_instance); 416 pr_warn("If \"acpi_apic_instance=%d\" works better, " 417 "notify linux-acpi@vger.kernel.org\n", 418 acpi_apic_instance ? 0 : 2); 419 acpi_put_table(table); 420 421 } else 422 acpi_apic_instance = 0; 423 424 return; 425 } 426 427 static void acpi_table_taint(struct acpi_table_header *table) 428 { 429 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 430 table->signature, table->oem_table_id); 431 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 432 } 433 434 #ifdef CONFIG_ACPI_TABLE_UPGRADE 435 static u64 acpi_tables_addr; 436 static int all_tables_size; 437 438 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 439 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 440 { 441 u8 sum = 0; 442 u8 *end = buffer + length; 443 444 while (buffer < end) 445 sum = (u8) (sum + *(buffer++)); 446 return sum; 447 } 448 449 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 450 static const char * const table_sigs[] = { 451 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 452 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 453 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 454 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 455 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 456 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 457 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 458 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 459 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 460 461 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 462 463 #define NR_ACPI_INITRD_TABLES 64 464 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 465 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 466 467 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 468 469 void __init acpi_table_upgrade(void) 470 { 471 void *data = (void *)initrd_start; 472 size_t size = initrd_end - initrd_start; 473 int sig, no, table_nr = 0, total_offset = 0; 474 long offset = 0; 475 struct acpi_table_header *table; 476 char cpio_path[32] = "kernel/firmware/acpi/"; 477 struct cpio_data file; 478 479 if (data == NULL || size == 0) 480 return; 481 482 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 483 file = find_cpio_data(cpio_path, data, size, &offset); 484 if (!file.data) 485 break; 486 487 data += offset; 488 size -= offset; 489 490 if (file.size < sizeof(struct acpi_table_header)) { 491 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 492 cpio_path, file.name); 493 continue; 494 } 495 496 table = file.data; 497 498 for (sig = 0; table_sigs[sig]; sig++) 499 if (!memcmp(table->signature, table_sigs[sig], 4)) 500 break; 501 502 if (!table_sigs[sig]) { 503 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 504 cpio_path, file.name); 505 continue; 506 } 507 if (file.size != table->length) { 508 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 509 cpio_path, file.name); 510 continue; 511 } 512 if (acpi_table_checksum(file.data, table->length)) { 513 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 514 cpio_path, file.name); 515 continue; 516 } 517 518 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 519 table->signature, cpio_path, file.name, table->length); 520 521 all_tables_size += table->length; 522 acpi_initrd_files[table_nr].data = file.data; 523 acpi_initrd_files[table_nr].size = file.size; 524 table_nr++; 525 } 526 if (table_nr == 0) 527 return; 528 529 acpi_tables_addr = 530 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, 531 all_tables_size, PAGE_SIZE); 532 if (!acpi_tables_addr) { 533 WARN_ON(1); 534 return; 535 } 536 /* 537 * Only calling e820_add_reserve does not work and the 538 * tables are invalid (memory got used) later. 539 * memblock_reserve works as expected and the tables won't get modified. 540 * But it's not enough on X86 because ioremap will 541 * complain later (used by acpi_os_map_memory) that the pages 542 * that should get mapped are not marked "reserved". 543 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 544 * works fine. 545 */ 546 memblock_reserve(acpi_tables_addr, all_tables_size); 547 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 548 549 /* 550 * early_ioremap only can remap 256k one time. If we map all 551 * tables one time, we will hit the limit. Need to map chunks 552 * one by one during copying the same as that in relocate_initrd(). 553 */ 554 for (no = 0; no < table_nr; no++) { 555 unsigned char *src_p = acpi_initrd_files[no].data; 556 phys_addr_t size = acpi_initrd_files[no].size; 557 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 558 phys_addr_t slop, clen; 559 char *dest_p; 560 561 total_offset += size; 562 563 while (size) { 564 slop = dest_addr & ~PAGE_MASK; 565 clen = size; 566 if (clen > MAP_CHUNK_SIZE - slop) 567 clen = MAP_CHUNK_SIZE - slop; 568 dest_p = early_memremap(dest_addr & PAGE_MASK, 569 clen + slop); 570 memcpy(dest_p + slop, src_p, clen); 571 early_memunmap(dest_p, clen + slop); 572 src_p += clen; 573 dest_addr += clen; 574 size -= clen; 575 } 576 } 577 } 578 579 static acpi_status 580 acpi_table_initrd_override(struct acpi_table_header *existing_table, 581 acpi_physical_address *address, u32 *length) 582 { 583 int table_offset = 0; 584 int table_index = 0; 585 struct acpi_table_header *table; 586 u32 table_length; 587 588 *length = 0; 589 *address = 0; 590 if (!acpi_tables_addr) 591 return AE_OK; 592 593 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 594 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 595 ACPI_HEADER_SIZE); 596 if (table_offset + table->length > all_tables_size) { 597 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 598 WARN_ON(1); 599 return AE_OK; 600 } 601 602 table_length = table->length; 603 604 /* Only override tables matched */ 605 if (memcmp(existing_table->signature, table->signature, 4) || 606 memcmp(table->oem_id, existing_table->oem_id, 607 ACPI_OEM_ID_SIZE) || 608 memcmp(table->oem_table_id, existing_table->oem_table_id, 609 ACPI_OEM_TABLE_ID_SIZE)) { 610 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 611 goto next_table; 612 } 613 /* 614 * Mark the table to avoid being used in 615 * acpi_table_initrd_scan() and check the revision. 616 */ 617 if (test_and_set_bit(table_index, acpi_initrd_installed) || 618 existing_table->oem_revision >= table->oem_revision) { 619 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 620 goto next_table; 621 } 622 623 *length = table_length; 624 *address = acpi_tables_addr + table_offset; 625 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 626 table->signature, table->oem_id, 627 table->oem_table_id); 628 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 629 break; 630 631 next_table: 632 table_offset += table_length; 633 table_index++; 634 } 635 return AE_OK; 636 } 637 638 static void __init acpi_table_initrd_scan(void) 639 { 640 int table_offset = 0; 641 int table_index = 0; 642 u32 table_length; 643 struct acpi_table_header *table; 644 645 if (!acpi_tables_addr) 646 return; 647 648 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 649 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 650 ACPI_HEADER_SIZE); 651 if (table_offset + table->length > all_tables_size) { 652 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 653 WARN_ON(1); 654 return; 655 } 656 657 table_length = table->length; 658 659 /* Skip RSDT/XSDT which should only be used for override */ 660 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) || 661 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) { 662 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 663 goto next_table; 664 } 665 /* 666 * Mark the table to avoid being used in 667 * acpi_table_initrd_override(). Though this is not possible 668 * because override is disabled in acpi_install_table(). 669 */ 670 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 671 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 672 goto next_table; 673 } 674 675 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 676 table->signature, table->oem_id, 677 table->oem_table_id); 678 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 679 acpi_install_table(acpi_tables_addr + table_offset, TRUE); 680 next_table: 681 table_offset += table_length; 682 table_index++; 683 } 684 } 685 #else 686 static acpi_status 687 acpi_table_initrd_override(struct acpi_table_header *existing_table, 688 acpi_physical_address *address, 689 u32 *table_length) 690 { 691 *table_length = 0; 692 *address = 0; 693 return AE_OK; 694 } 695 696 static void __init acpi_table_initrd_scan(void) 697 { 698 } 699 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 700 701 acpi_status 702 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 703 acpi_physical_address *address, 704 u32 *table_length) 705 { 706 return acpi_table_initrd_override(existing_table, address, 707 table_length); 708 } 709 710 acpi_status 711 acpi_os_table_override(struct acpi_table_header *existing_table, 712 struct acpi_table_header **new_table) 713 { 714 if (!existing_table || !new_table) 715 return AE_BAD_PARAMETER; 716 717 *new_table = NULL; 718 719 #ifdef CONFIG_ACPI_CUSTOM_DSDT 720 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 721 *new_table = (struct acpi_table_header *)AmlCode; 722 #endif 723 if (*new_table != NULL) 724 acpi_table_taint(existing_table); 725 return AE_OK; 726 } 727 728 /* 729 * acpi_table_init() 730 * 731 * find RSDP, find and checksum SDT/XSDT. 732 * checksum all tables, print SDT/XSDT 733 * 734 * result: sdt_entry[] is initialized 735 */ 736 737 int __init acpi_table_init(void) 738 { 739 acpi_status status; 740 741 if (acpi_verify_table_checksum) { 742 pr_info("Early table checksum verification enabled\n"); 743 acpi_gbl_enable_table_validation = TRUE; 744 } else { 745 pr_info("Early table checksum verification disabled\n"); 746 acpi_gbl_enable_table_validation = FALSE; 747 } 748 749 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 750 if (ACPI_FAILURE(status)) 751 return -EINVAL; 752 acpi_table_initrd_scan(); 753 754 check_multiple_madt(); 755 return 0; 756 } 757 758 static int __init acpi_parse_apic_instance(char *str) 759 { 760 if (!str) 761 return -EINVAL; 762 763 if (kstrtoint(str, 0, &acpi_apic_instance)) 764 return -EINVAL; 765 766 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 767 768 return 0; 769 } 770 771 early_param("acpi_apic_instance", acpi_parse_apic_instance); 772 773 static int __init acpi_force_table_verification_setup(char *s) 774 { 775 acpi_verify_table_checksum = true; 776 777 return 0; 778 } 779 780 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 781 782 static int __init acpi_force_32bit_fadt_addr(char *s) 783 { 784 pr_info("Forcing 32 Bit FADT addresses\n"); 785 acpi_gbl_use32_bit_fadt_addresses = TRUE; 786 787 return 0; 788 } 789 790 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 791