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 <asm/fixmap.h> 26 #include "internal.h" 27 28 #ifdef CONFIG_ACPI_CUSTOM_DSDT 29 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 30 #endif 31 32 #define ACPI_MAX_TABLES 128 33 34 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 35 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 36 37 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 38 39 static int acpi_apic_instance __initdata_or_acpilib; 40 41 /* 42 * Disable table checksum verification for the early stage due to the size 43 * limitation of the current x86 early mapping implementation. 44 */ 45 static bool acpi_verify_table_checksum __initdata_or_acpilib = false; 46 47 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 48 { 49 if (!header) 50 return; 51 52 switch (header->type) { 53 54 case ACPI_MADT_TYPE_LOCAL_APIC: 55 { 56 struct acpi_madt_local_apic *p = 57 (struct acpi_madt_local_apic *)header; 58 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 59 p->processor_id, p->id, 60 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED)); 61 } 62 break; 63 64 case ACPI_MADT_TYPE_LOCAL_X2APIC: 65 { 66 struct acpi_madt_local_x2apic *p = 67 (struct acpi_madt_local_x2apic *)header; 68 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 69 p->local_apic_id, p->uid, 70 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED)); 71 } 72 break; 73 74 case ACPI_MADT_TYPE_IO_APIC: 75 { 76 struct acpi_madt_io_apic *p = 77 (struct acpi_madt_io_apic *)header; 78 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 79 p->id, p->address, p->global_irq_base); 80 } 81 break; 82 83 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 84 { 85 struct acpi_madt_interrupt_override *p = 86 (struct acpi_madt_interrupt_override *)header; 87 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 88 p->bus, p->source_irq, p->global_irq, 89 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 90 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 91 if (p->inti_flags & 92 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 93 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 94 p->inti_flags & 95 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 96 } 97 break; 98 99 case ACPI_MADT_TYPE_NMI_SOURCE: 100 { 101 struct acpi_madt_nmi_source *p = 102 (struct acpi_madt_nmi_source *)header; 103 pr_info("NMI_SRC (%s %s global_irq %d)\n", 104 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 105 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 106 p->global_irq); 107 } 108 break; 109 110 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 111 { 112 struct acpi_madt_local_apic_nmi *p = 113 (struct acpi_madt_local_apic_nmi *)header; 114 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 115 p->processor_id, 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->lint); 119 } 120 break; 121 122 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 123 { 124 u16 polarity, trigger; 125 struct acpi_madt_local_x2apic_nmi *p = 126 (struct acpi_madt_local_x2apic_nmi *)header; 127 128 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 129 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 130 131 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 132 p->uid, 133 mps_inti_flags_polarity[polarity], 134 mps_inti_flags_trigger[trigger], 135 p->lint); 136 } 137 break; 138 139 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 140 { 141 struct acpi_madt_local_apic_override *p = 142 (struct acpi_madt_local_apic_override *)header; 143 pr_info("LAPIC_ADDR_OVR (address[0x%llx])\n", 144 p->address); 145 } 146 break; 147 148 case ACPI_MADT_TYPE_IO_SAPIC: 149 { 150 struct acpi_madt_io_sapic *p = 151 (struct acpi_madt_io_sapic *)header; 152 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 153 p->id, (void *)(unsigned long)p->address, 154 p->global_irq_base); 155 } 156 break; 157 158 case ACPI_MADT_TYPE_LOCAL_SAPIC: 159 { 160 struct acpi_madt_local_sapic *p = 161 (struct acpi_madt_local_sapic *)header; 162 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 163 p->processor_id, p->id, p->eid, 164 str_enabled_disabled(p->lapic_flags & ACPI_MADT_ENABLED)); 165 } 166 break; 167 168 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 169 { 170 struct acpi_madt_interrupt_source *p = 171 (struct acpi_madt_interrupt_source *)header; 172 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", 173 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 174 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 175 p->type, p->id, p->eid, p->io_sapic_vector, 176 p->global_irq); 177 } 178 break; 179 180 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 181 { 182 struct acpi_madt_generic_interrupt *p = 183 (struct acpi_madt_generic_interrupt *)header; 184 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 185 p->uid, p->base_address, 186 p->arm_mpidr, 187 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED)); 188 189 } 190 break; 191 192 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 193 { 194 struct acpi_madt_generic_distributor *p = 195 (struct acpi_madt_generic_distributor *)header; 196 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 197 p->gic_id, p->base_address, 198 p->global_irq_base); 199 } 200 break; 201 202 case ACPI_MADT_TYPE_MULTIPROC_WAKEUP: 203 { 204 struct acpi_madt_multiproc_wakeup *p = 205 (struct acpi_madt_multiproc_wakeup *)header; 206 u64 reset_vector = 0; 207 208 if (p->version >= ACPI_MADT_MP_WAKEUP_VERSION_V1) 209 reset_vector = p->reset_vector; 210 211 pr_debug("MP Wakeup (version[%d], mailbox[%#llx], reset[%#llx])\n", 212 p->version, p->mailbox_address, reset_vector); 213 } 214 break; 215 216 case ACPI_MADT_TYPE_CORE_PIC: 217 { 218 struct acpi_madt_core_pic *p = (struct acpi_madt_core_pic *)header; 219 220 pr_debug("CORE PIC (processor_id[0x%02x] core_id[0x%02x] %s)\n", 221 p->processor_id, p->core_id, 222 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED)); 223 } 224 break; 225 226 case ACPI_MADT_TYPE_RINTC: 227 { 228 struct acpi_madt_rintc *p = (struct acpi_madt_rintc *)header; 229 230 pr_debug("RISC-V INTC (acpi_uid[0x%04x] hart_id[0x%llx] %s)\n", 231 p->uid, p->hart_id, 232 str_enabled_disabled(p->flags & ACPI_MADT_ENABLED)); 233 } 234 break; 235 236 default: 237 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 238 header->type); 239 break; 240 } 241 } 242 243 int __init_or_acpilib acpi_table_parse_entries_array( 244 char *id, unsigned long table_size, struct acpi_subtable_proc *proc, 245 int proc_num, unsigned int max_entries) 246 { 247 struct acpi_table_header *table_header = NULL; 248 int count; 249 u32 instance = 0; 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 (!strncmp(id, ACPI_SIG_MADT, 4)) 261 instance = acpi_apic_instance; 262 263 acpi_get_table(id, instance, &table_header); 264 if (!table_header) { 265 pr_debug("%4.4s not present\n", id); 266 return -ENODEV; 267 } 268 269 count = acpi_parse_entries_array(id, table_size, 270 (union fw_table_header *)table_header, 271 0, proc, proc_num, max_entries); 272 273 acpi_put_table(table_header); 274 return count; 275 } 276 277 static int __init_or_acpilib __acpi_table_parse_entries( 278 char *id, unsigned long table_size, int entry_id, 279 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg, 280 void *arg, unsigned int max_entries) 281 { 282 struct acpi_subtable_proc proc = { 283 .id = entry_id, 284 .handler = handler, 285 .handler_arg = handler_arg, 286 .arg = arg, 287 }; 288 289 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 290 max_entries); 291 } 292 293 int __init_or_acpilib 294 acpi_table_parse_cedt(enum acpi_cedt_type id, 295 acpi_tbl_entry_handler_arg handler_arg, void *arg) 296 { 297 return __acpi_table_parse_entries(ACPI_SIG_CEDT, 298 sizeof(struct acpi_table_cedt), id, 299 NULL, handler_arg, arg, 0); 300 } 301 EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt); 302 303 int __init acpi_table_parse_entries(char *id, unsigned long table_size, 304 int entry_id, 305 acpi_tbl_entry_handler handler, 306 unsigned int max_entries) 307 { 308 return __acpi_table_parse_entries(id, table_size, entry_id, handler, 309 NULL, NULL, max_entries); 310 } 311 312 int __init acpi_table_parse_madt(enum acpi_madt_type id, 313 acpi_tbl_entry_handler handler, unsigned int max_entries) 314 { 315 return acpi_table_parse_entries(ACPI_SIG_MADT, 316 sizeof(struct acpi_table_madt), id, 317 handler, max_entries); 318 } 319 320 /** 321 * acpi_table_parse - find table with @id, run @handler on it 322 * @id: table id to find 323 * @handler: handler to run 324 * 325 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 326 * run @handler on it. 327 * 328 * Return 0 if table found, -errno if not. 329 */ 330 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 331 { 332 struct acpi_table_header *table = NULL; 333 334 if (acpi_disabled) 335 return -ENODEV; 336 337 if (!id || !handler) 338 return -EINVAL; 339 340 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 341 acpi_get_table(id, acpi_apic_instance, &table); 342 else 343 acpi_get_table(id, 0, &table); 344 345 if (table) { 346 handler(table); 347 acpi_put_table(table); 348 return 0; 349 } else 350 return -ENODEV; 351 } 352 353 /* 354 * The BIOS is supposed to supply a single APIC/MADT, 355 * but some report two. Provide a knob to use either. 356 * (don't you wish instance 0 and 1 were not the same?) 357 */ 358 static void __init check_multiple_madt(void) 359 { 360 struct acpi_table_header *table = NULL; 361 362 acpi_get_table(ACPI_SIG_MADT, 2, &table); 363 if (table) { 364 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 365 acpi_apic_instance); 366 pr_warn("If \"acpi_apic_instance=%d\" works better, " 367 "notify linux-acpi@vger.kernel.org\n", 368 acpi_apic_instance ? 0 : 2); 369 acpi_put_table(table); 370 371 } else 372 acpi_apic_instance = 0; 373 374 return; 375 } 376 377 static void acpi_table_taint(struct acpi_table_header *table) 378 { 379 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 380 table->signature, table->oem_table_id); 381 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 382 } 383 384 #ifdef CONFIG_ACPI_TABLE_UPGRADE 385 static u64 acpi_tables_addr; 386 static int all_tables_size; 387 388 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 389 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 390 { 391 u8 sum = 0; 392 u8 *end = buffer + length; 393 394 while (buffer < end) 395 sum = (u8) (sum + *(buffer++)); 396 return sum; 397 } 398 399 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 400 static const char table_sigs[][ACPI_NAMESEG_SIZE] __nonstring_array __initconst = { 401 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, 402 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, 403 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, 404 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, 405 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, 406 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, 407 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, 408 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, 409 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, 410 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, 411 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI, 412 ACPI_SIG_NBFT, ACPI_SIG_SWFT, ACPI_SIG_MPAM}; 413 414 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 415 416 #define NR_ACPI_INITRD_TABLES 64 417 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 418 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 419 420 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 421 422 void __init acpi_table_upgrade(void) 423 { 424 void *data; 425 size_t size; 426 int sig, no, table_nr = 0, total_offset = 0; 427 long offset = 0; 428 struct acpi_table_header *table; 429 char cpio_path[32] = "kernel/firmware/acpi/"; 430 struct cpio_data file; 431 432 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) { 433 data = __initramfs_start; 434 size = __initramfs_size; 435 } else { 436 data = (void *)initrd_start; 437 size = initrd_end - initrd_start; 438 } 439 440 if (data == NULL || size == 0) 441 return; 442 443 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 444 file = find_cpio_data(cpio_path, data, size, &offset); 445 if (!file.data) 446 break; 447 448 data += offset; 449 size -= offset; 450 451 if (file.size < sizeof(struct acpi_table_header)) { 452 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 453 cpio_path, file.name); 454 continue; 455 } 456 457 table = file.data; 458 459 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++) 460 if (!memcmp(table->signature, table_sigs[sig], 4)) 461 break; 462 463 if (sig >= ARRAY_SIZE(table_sigs)) { 464 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 465 cpio_path, file.name); 466 continue; 467 } 468 if (file.size != table->length) { 469 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 470 cpio_path, file.name); 471 continue; 472 } 473 if (acpi_table_checksum(file.data, table->length)) { 474 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 475 cpio_path, file.name); 476 continue; 477 } 478 479 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 480 table->signature, cpio_path, file.name, table->length); 481 482 all_tables_size += table->length; 483 acpi_initrd_files[table_nr].data = file.data; 484 acpi_initrd_files[table_nr].size = file.size; 485 table_nr++; 486 } 487 if (table_nr == 0) 488 return; 489 490 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) { 491 pr_notice("kernel is locked down, ignoring table override\n"); 492 return; 493 } 494 495 acpi_tables_addr = 496 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE, 497 0, ACPI_TABLE_UPGRADE_MAX_PHYS); 498 if (!acpi_tables_addr) { 499 WARN_ON(1); 500 return; 501 } 502 /* 503 * Only calling e820_add_reserve does not work and the 504 * tables are invalid (memory got used) later. 505 * memblock_reserve works as expected and the tables won't get modified. 506 * But it's not enough on X86 because ioremap will 507 * complain later (used by acpi_os_map_memory) that the pages 508 * that should get mapped are not marked "reserved". 509 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 510 * works fine. 511 */ 512 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 513 514 kmemleak_ignore_phys(acpi_tables_addr); 515 516 /* 517 * early_ioremap only can remap 256k one time. If we map all 518 * tables one time, we will hit the limit. Need to map chunks 519 * one by one during copying the same as that in relocate_initrd(). 520 */ 521 for (no = 0; no < table_nr; no++) { 522 unsigned char *src_p = acpi_initrd_files[no].data; 523 phys_addr_t size = acpi_initrd_files[no].size; 524 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 525 phys_addr_t slop, clen; 526 char *dest_p; 527 528 total_offset += size; 529 530 while (size) { 531 slop = dest_addr & ~PAGE_MASK; 532 clen = size; 533 if (clen > MAP_CHUNK_SIZE - slop) 534 clen = MAP_CHUNK_SIZE - slop; 535 dest_p = early_memremap(dest_addr & PAGE_MASK, 536 clen + slop); 537 memcpy(dest_p + slop, src_p, clen); 538 early_memunmap(dest_p, clen + slop); 539 src_p += clen; 540 dest_addr += clen; 541 size -= clen; 542 } 543 } 544 } 545 546 static acpi_status 547 acpi_table_initrd_override(struct acpi_table_header *existing_table, 548 acpi_physical_address *address, u32 *length) 549 { 550 int table_offset = 0; 551 int table_index = 0; 552 struct acpi_table_header *table; 553 u32 table_length; 554 555 *length = 0; 556 *address = 0; 557 if (!acpi_tables_addr) 558 return AE_OK; 559 560 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 561 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 562 ACPI_HEADER_SIZE); 563 if (table_offset + table->length > all_tables_size) { 564 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 565 WARN_ON(1); 566 return AE_OK; 567 } 568 569 table_length = table->length; 570 571 /* Only override tables matched */ 572 if (memcmp(existing_table->signature, table->signature, 4) || 573 memcmp(table->oem_id, existing_table->oem_id, 574 ACPI_OEM_ID_SIZE) || 575 memcmp(table->oem_table_id, existing_table->oem_table_id, 576 ACPI_OEM_TABLE_ID_SIZE)) { 577 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 578 goto next_table; 579 } 580 /* 581 * Mark the table to avoid being used in 582 * acpi_table_initrd_scan() and check the revision. 583 */ 584 if (test_and_set_bit(table_index, acpi_initrd_installed) || 585 existing_table->oem_revision >= table->oem_revision) { 586 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 587 goto next_table; 588 } 589 590 *length = table_length; 591 *address = acpi_tables_addr + table_offset; 592 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 593 table->signature, table->oem_id, 594 table->oem_table_id); 595 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 596 break; 597 598 next_table: 599 table_offset += table_length; 600 table_index++; 601 } 602 return AE_OK; 603 } 604 605 static void __init acpi_table_initrd_scan(void) 606 { 607 int table_offset = 0; 608 int table_index = 0; 609 u32 table_length; 610 struct acpi_table_header *table; 611 612 if (!acpi_tables_addr) 613 return; 614 615 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 616 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 617 ACPI_HEADER_SIZE); 618 if (table_offset + table->length > all_tables_size) { 619 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 620 WARN_ON(1); 621 return; 622 } 623 624 table_length = table->length; 625 626 /* Skip RSDT/XSDT which should only be used for override */ 627 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 628 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 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_override(). Though this is not possible 635 * because override is disabled in acpi_install_physical_table(). 636 */ 637 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 638 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 639 goto next_table; 640 } 641 642 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 643 table->signature, table->oem_id, 644 table->oem_table_id); 645 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 646 acpi_install_physical_table(acpi_tables_addr + table_offset); 647 next_table: 648 table_offset += table_length; 649 table_index++; 650 } 651 } 652 #else 653 static acpi_status 654 acpi_table_initrd_override(struct acpi_table_header *existing_table, 655 acpi_physical_address *address, 656 u32 *table_length) 657 { 658 *table_length = 0; 659 *address = 0; 660 return AE_OK; 661 } 662 663 static void __init acpi_table_initrd_scan(void) 664 { 665 } 666 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 667 668 acpi_status 669 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 670 acpi_physical_address *address, 671 u32 *table_length) 672 { 673 return acpi_table_initrd_override(existing_table, address, 674 table_length); 675 } 676 677 #ifdef CONFIG_ACPI_CUSTOM_DSDT 678 static void *amlcode __attribute__ ((weakref("AmlCode"))); 679 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); 680 #endif 681 682 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, 683 struct acpi_table_header **new_table) 684 { 685 if (!existing_table || !new_table) 686 return AE_BAD_PARAMETER; 687 688 *new_table = NULL; 689 690 #ifdef CONFIG_ACPI_CUSTOM_DSDT 691 if (!strncmp(existing_table->signature, "DSDT", 4)) { 692 *new_table = (struct acpi_table_header *)&amlcode; 693 if (!(*new_table)) 694 *new_table = (struct acpi_table_header *)&dsdt_amlcode; 695 } 696 #endif 697 if (*new_table != NULL) 698 acpi_table_taint(existing_table); 699 return AE_OK; 700 } 701 702 /* 703 * acpi_locate_initial_tables() 704 * 705 * Get the RSDP, then find and checksum all the ACPI tables. 706 * 707 * result: initial_tables[] is initialized, and points to 708 * a list of ACPI tables. 709 */ 710 int __init acpi_locate_initial_tables(void) 711 { 712 acpi_status status; 713 714 if (acpi_verify_table_checksum) { 715 pr_info("Early table checksum verification enabled\n"); 716 acpi_gbl_enable_table_validation = TRUE; 717 } else { 718 pr_info("Early table checksum verification disabled\n"); 719 acpi_gbl_enable_table_validation = FALSE; 720 } 721 722 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 723 if (ACPI_FAILURE(status)) { 724 const char *msg = acpi_format_exception(status); 725 726 pr_warn("Failed to initialize tables, status=0x%x (%s)", status, msg); 727 return -EINVAL; 728 } 729 730 return 0; 731 } 732 733 void __init acpi_reserve_initial_tables(void) 734 { 735 int i; 736 737 for (i = 0; i < ACPI_MAX_TABLES; i++) { 738 struct acpi_table_desc *table_desc = &initial_tables[i]; 739 u64 start = table_desc->address; 740 u64 size = table_desc->length; 741 742 if (!start || !size) 743 break; 744 745 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n", 746 table_desc->signature.ascii, start, start + size - 1); 747 748 memblock_reserve(start, size); 749 } 750 } 751 752 void __init acpi_table_init_complete(void) 753 { 754 acpi_table_initrd_scan(); 755 check_multiple_madt(); 756 } 757 758 int __init acpi_table_init(void) 759 { 760 int ret; 761 762 ret = acpi_locate_initial_tables(); 763 if (ret) 764 return ret; 765 766 acpi_table_init_complete(); 767 768 return 0; 769 } 770 771 static int __init acpi_parse_apic_instance(char *str) 772 { 773 if (!str) 774 return -EINVAL; 775 776 if (kstrtoint(str, 0, &acpi_apic_instance)) 777 return -EINVAL; 778 779 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 780 781 return 0; 782 } 783 early_param("acpi_apic_instance", acpi_parse_apic_instance); 784 785 static int __init acpi_force_table_verification_setup(char *s) 786 { 787 acpi_verify_table_checksum = true; 788 789 return 0; 790 } 791 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 792 793 static int __init acpi_force_32bit_fadt_addr(char *s) 794 { 795 pr_info("Forcing 32 Bit FADT addresses\n"); 796 acpi_gbl_use32_bit_fadt_addresses = TRUE; 797 798 return 0; 799 } 800 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 801