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 33 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 34 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 35 36 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 37 38 static 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 */ 44 static bool acpi_verify_table_checksum __initdata_or_acpilib = false; 45 46 void 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 } 227 228 int __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, table_header, 255 proc, proc_num, max_entries); 256 257 acpi_put_table(table_header); 258 return count; 259 } 260 261 static int __init_or_acpilib __acpi_table_parse_entries( 262 char *id, unsigned long table_size, int entry_id, 263 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg, 264 void *arg, unsigned int max_entries) 265 { 266 struct acpi_subtable_proc proc = { 267 .id = entry_id, 268 .handler = handler, 269 .handler_arg = handler_arg, 270 .arg = arg, 271 }; 272 273 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 274 max_entries); 275 } 276 277 int __init_or_acpilib 278 acpi_table_parse_cedt(enum acpi_cedt_type id, 279 acpi_tbl_entry_handler_arg handler_arg, void *arg) 280 { 281 return __acpi_table_parse_entries(ACPI_SIG_CEDT, 282 sizeof(struct acpi_table_cedt), id, 283 NULL, handler_arg, arg, 0); 284 } 285 EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt); 286 287 int __init acpi_table_parse_entries(char *id, unsigned long table_size, 288 int entry_id, 289 acpi_tbl_entry_handler handler, 290 unsigned int max_entries) 291 { 292 return __acpi_table_parse_entries(id, table_size, entry_id, handler, 293 NULL, NULL, max_entries); 294 } 295 296 int __init acpi_table_parse_madt(enum acpi_madt_type id, 297 acpi_tbl_entry_handler handler, unsigned int max_entries) 298 { 299 return acpi_table_parse_entries(ACPI_SIG_MADT, 300 sizeof(struct acpi_table_madt), id, 301 handler, max_entries); 302 } 303 304 /** 305 * acpi_table_parse - find table with @id, run @handler on it 306 * @id: table id to find 307 * @handler: handler to run 308 * 309 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 310 * run @handler on it. 311 * 312 * Return 0 if table found, -errno if not. 313 */ 314 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 315 { 316 struct acpi_table_header *table = NULL; 317 318 if (acpi_disabled) 319 return -ENODEV; 320 321 if (!id || !handler) 322 return -EINVAL; 323 324 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 325 acpi_get_table(id, acpi_apic_instance, &table); 326 else 327 acpi_get_table(id, 0, &table); 328 329 if (table) { 330 handler(table); 331 acpi_put_table(table); 332 return 0; 333 } else 334 return -ENODEV; 335 } 336 337 /* 338 * The BIOS is supposed to supply a single APIC/MADT, 339 * but some report two. Provide a knob to use either. 340 * (don't you wish instance 0 and 1 were not the same?) 341 */ 342 static void __init check_multiple_madt(void) 343 { 344 struct acpi_table_header *table = NULL; 345 346 acpi_get_table(ACPI_SIG_MADT, 2, &table); 347 if (table) { 348 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 349 acpi_apic_instance); 350 pr_warn("If \"acpi_apic_instance=%d\" works better, " 351 "notify linux-acpi@vger.kernel.org\n", 352 acpi_apic_instance ? 0 : 2); 353 acpi_put_table(table); 354 355 } else 356 acpi_apic_instance = 0; 357 358 return; 359 } 360 361 static void acpi_table_taint(struct acpi_table_header *table) 362 { 363 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 364 table->signature, table->oem_table_id); 365 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 366 } 367 368 #ifdef CONFIG_ACPI_TABLE_UPGRADE 369 static u64 acpi_tables_addr; 370 static int all_tables_size; 371 372 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 373 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 374 { 375 u8 sum = 0; 376 u8 *end = buffer + length; 377 378 while (buffer < end) 379 sum = (u8) (sum + *(buffer++)); 380 return sum; 381 } 382 383 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 384 static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = { 385 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, 386 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, 387 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, 388 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, 389 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, 390 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, 391 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, 392 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, 393 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, 394 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, 395 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI, 396 ACPI_SIG_NBFT }; 397 398 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 399 400 #define NR_ACPI_INITRD_TABLES 64 401 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 402 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 403 404 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 405 406 void __init acpi_table_upgrade(void) 407 { 408 void *data; 409 size_t size; 410 int sig, no, table_nr = 0, total_offset = 0; 411 long offset = 0; 412 struct acpi_table_header *table; 413 char cpio_path[32] = "kernel/firmware/acpi/"; 414 struct cpio_data file; 415 416 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) { 417 data = __initramfs_start; 418 size = __initramfs_size; 419 } else { 420 data = (void *)initrd_start; 421 size = initrd_end - initrd_start; 422 } 423 424 if (data == NULL || size == 0) 425 return; 426 427 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 428 file = find_cpio_data(cpio_path, data, size, &offset); 429 if (!file.data) 430 break; 431 432 data += offset; 433 size -= offset; 434 435 if (file.size < sizeof(struct acpi_table_header)) { 436 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 437 cpio_path, file.name); 438 continue; 439 } 440 441 table = file.data; 442 443 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++) 444 if (!memcmp(table->signature, table_sigs[sig], 4)) 445 break; 446 447 if (sig >= ARRAY_SIZE(table_sigs)) { 448 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 449 cpio_path, file.name); 450 continue; 451 } 452 if (file.size != table->length) { 453 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 454 cpio_path, file.name); 455 continue; 456 } 457 if (acpi_table_checksum(file.data, table->length)) { 458 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 459 cpio_path, file.name); 460 continue; 461 } 462 463 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 464 table->signature, cpio_path, file.name, table->length); 465 466 all_tables_size += table->length; 467 acpi_initrd_files[table_nr].data = file.data; 468 acpi_initrd_files[table_nr].size = file.size; 469 table_nr++; 470 } 471 if (table_nr == 0) 472 return; 473 474 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) { 475 pr_notice("kernel is locked down, ignoring table override\n"); 476 return; 477 } 478 479 acpi_tables_addr = 480 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE, 481 0, ACPI_TABLE_UPGRADE_MAX_PHYS); 482 if (!acpi_tables_addr) { 483 WARN_ON(1); 484 return; 485 } 486 /* 487 * Only calling e820_add_reserve does not work and the 488 * tables are invalid (memory got used) later. 489 * memblock_reserve works as expected and the tables won't get modified. 490 * But it's not enough on X86 because ioremap will 491 * complain later (used by acpi_os_map_memory) that the pages 492 * that should get mapped are not marked "reserved". 493 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 494 * works fine. 495 */ 496 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 497 498 kmemleak_ignore_phys(acpi_tables_addr); 499 500 /* 501 * early_ioremap only can remap 256k one time. If we map all 502 * tables one time, we will hit the limit. Need to map chunks 503 * one by one during copying the same as that in relocate_initrd(). 504 */ 505 for (no = 0; no < table_nr; no++) { 506 unsigned char *src_p = acpi_initrd_files[no].data; 507 phys_addr_t size = acpi_initrd_files[no].size; 508 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 509 phys_addr_t slop, clen; 510 char *dest_p; 511 512 total_offset += size; 513 514 while (size) { 515 slop = dest_addr & ~PAGE_MASK; 516 clen = size; 517 if (clen > MAP_CHUNK_SIZE - slop) 518 clen = MAP_CHUNK_SIZE - slop; 519 dest_p = early_memremap(dest_addr & PAGE_MASK, 520 clen + slop); 521 memcpy(dest_p + slop, src_p, clen); 522 early_memunmap(dest_p, clen + slop); 523 src_p += clen; 524 dest_addr += clen; 525 size -= clen; 526 } 527 } 528 } 529 530 static acpi_status 531 acpi_table_initrd_override(struct acpi_table_header *existing_table, 532 acpi_physical_address *address, u32 *length) 533 { 534 int table_offset = 0; 535 int table_index = 0; 536 struct acpi_table_header *table; 537 u32 table_length; 538 539 *length = 0; 540 *address = 0; 541 if (!acpi_tables_addr) 542 return AE_OK; 543 544 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 545 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 546 ACPI_HEADER_SIZE); 547 if (table_offset + table->length > all_tables_size) { 548 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 549 WARN_ON(1); 550 return AE_OK; 551 } 552 553 table_length = table->length; 554 555 /* Only override tables matched */ 556 if (memcmp(existing_table->signature, table->signature, 4) || 557 memcmp(table->oem_id, existing_table->oem_id, 558 ACPI_OEM_ID_SIZE) || 559 memcmp(table->oem_table_id, existing_table->oem_table_id, 560 ACPI_OEM_TABLE_ID_SIZE)) { 561 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 562 goto next_table; 563 } 564 /* 565 * Mark the table to avoid being used in 566 * acpi_table_initrd_scan() and check the revision. 567 */ 568 if (test_and_set_bit(table_index, acpi_initrd_installed) || 569 existing_table->oem_revision >= table->oem_revision) { 570 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 571 goto next_table; 572 } 573 574 *length = table_length; 575 *address = acpi_tables_addr + table_offset; 576 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 577 table->signature, table->oem_id, 578 table->oem_table_id); 579 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 580 break; 581 582 next_table: 583 table_offset += table_length; 584 table_index++; 585 } 586 return AE_OK; 587 } 588 589 static void __init acpi_table_initrd_scan(void) 590 { 591 int table_offset = 0; 592 int table_index = 0; 593 u32 table_length; 594 struct acpi_table_header *table; 595 596 if (!acpi_tables_addr) 597 return; 598 599 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 600 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 601 ACPI_HEADER_SIZE); 602 if (table_offset + table->length > all_tables_size) { 603 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 604 WARN_ON(1); 605 return; 606 } 607 608 table_length = table->length; 609 610 /* Skip RSDT/XSDT which should only be used for override */ 611 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 612 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 613 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 614 goto next_table; 615 } 616 /* 617 * Mark the table to avoid being used in 618 * acpi_table_initrd_override(). Though this is not possible 619 * because override is disabled in acpi_install_physical_table(). 620 */ 621 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 622 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 623 goto next_table; 624 } 625 626 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 627 table->signature, table->oem_id, 628 table->oem_table_id); 629 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 630 acpi_install_physical_table(acpi_tables_addr + table_offset); 631 next_table: 632 table_offset += table_length; 633 table_index++; 634 } 635 } 636 #else 637 static acpi_status 638 acpi_table_initrd_override(struct acpi_table_header *existing_table, 639 acpi_physical_address *address, 640 u32 *table_length) 641 { 642 *table_length = 0; 643 *address = 0; 644 return AE_OK; 645 } 646 647 static void __init acpi_table_initrd_scan(void) 648 { 649 } 650 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 651 652 acpi_status 653 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 654 acpi_physical_address *address, 655 u32 *table_length) 656 { 657 return acpi_table_initrd_override(existing_table, address, 658 table_length); 659 } 660 661 #ifdef CONFIG_ACPI_CUSTOM_DSDT 662 static void *amlcode __attribute__ ((weakref("AmlCode"))); 663 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); 664 #endif 665 666 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, 667 struct acpi_table_header **new_table) 668 { 669 if (!existing_table || !new_table) 670 return AE_BAD_PARAMETER; 671 672 *new_table = NULL; 673 674 #ifdef CONFIG_ACPI_CUSTOM_DSDT 675 if (!strncmp(existing_table->signature, "DSDT", 4)) { 676 *new_table = (struct acpi_table_header *)&amlcode; 677 if (!(*new_table)) 678 *new_table = (struct acpi_table_header *)&dsdt_amlcode; 679 } 680 #endif 681 if (*new_table != NULL) 682 acpi_table_taint(existing_table); 683 return AE_OK; 684 } 685 686 /* 687 * acpi_locate_initial_tables() 688 * 689 * Get the RSDP, then find and checksum all the ACPI tables. 690 * 691 * result: initial_tables[] is initialized, and points to 692 * a list of ACPI tables. 693 */ 694 int __init acpi_locate_initial_tables(void) 695 { 696 acpi_status status; 697 698 if (acpi_verify_table_checksum) { 699 pr_info("Early table checksum verification enabled\n"); 700 acpi_gbl_enable_table_validation = TRUE; 701 } else { 702 pr_info("Early table checksum verification disabled\n"); 703 acpi_gbl_enable_table_validation = FALSE; 704 } 705 706 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 707 if (ACPI_FAILURE(status)) 708 return -EINVAL; 709 710 return 0; 711 } 712 713 void __init acpi_reserve_initial_tables(void) 714 { 715 int i; 716 717 for (i = 0; i < ACPI_MAX_TABLES; i++) { 718 struct acpi_table_desc *table_desc = &initial_tables[i]; 719 u64 start = table_desc->address; 720 u64 size = table_desc->length; 721 722 if (!start || !size) 723 break; 724 725 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n", 726 table_desc->signature.ascii, start, start + size - 1); 727 728 memblock_reserve(start, size); 729 } 730 } 731 732 void __init acpi_table_init_complete(void) 733 { 734 acpi_table_initrd_scan(); 735 check_multiple_madt(); 736 } 737 738 int __init acpi_table_init(void) 739 { 740 int ret; 741 742 ret = acpi_locate_initial_tables(); 743 if (ret) 744 return ret; 745 746 acpi_table_init_complete(); 747 748 return 0; 749 } 750 751 static int __init acpi_parse_apic_instance(char *str) 752 { 753 if (!str) 754 return -EINVAL; 755 756 if (kstrtoint(str, 0, &acpi_apic_instance)) 757 return -EINVAL; 758 759 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 760 761 return 0; 762 } 763 early_param("acpi_apic_instance", acpi_parse_apic_instance); 764 765 static int __init acpi_force_table_verification_setup(char *s) 766 { 767 acpi_verify_table_checksum = true; 768 769 return 0; 770 } 771 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 772 773 static int __init acpi_force_32bit_fadt_addr(char *s) 774 { 775 pr_info("Forcing 32 Bit FADT addresses\n"); 776 acpi_gbl_use32_bit_fadt_addresses = TRUE; 777 778 return 0; 779 } 780 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 781