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