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 "internal.h" 25 26#ifdef CONFIG_ACPI_CUSTOM_DSDT 27#include CONFIG_ACPI_CUSTOM_DSDT_FILE 28#endif 29 30#define ACPI_MAX_TABLES 128 31 32static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 33static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 34 35static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 36 37static int acpi_apic_instance __initdata; 38 39enum acpi_subtable_type { 40 ACPI_SUBTABLE_COMMON, 41 ACPI_SUBTABLE_HMAT, 42}; 43 44struct acpi_subtable_entry { 45 union acpi_subtable_headers *hdr; 46 enum acpi_subtable_type type; 47}; 48 49/* 50 * Disable table checksum verification for the early stage due to the size 51 * limitation of the current x86 early mapping implementation. 52 */ 53static bool acpi_verify_table_checksum __initdata = false; 54 55void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 56{ 57 if (!header) 58 return; 59 60 switch (header->type) { 61 62 case ACPI_MADT_TYPE_LOCAL_APIC: 63 { 64 struct acpi_madt_local_apic *p = 65 (struct acpi_madt_local_apic *)header; 66 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 67 p->processor_id, p->id, 68 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 69 } 70 break; 71 72 case ACPI_MADT_TYPE_LOCAL_X2APIC: 73 { 74 struct acpi_madt_local_x2apic *p = 75 (struct acpi_madt_local_x2apic *)header; 76 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 77 p->local_apic_id, p->uid, 78 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 79 } 80 break; 81 82 case ACPI_MADT_TYPE_IO_APIC: 83 { 84 struct acpi_madt_io_apic *p = 85 (struct acpi_madt_io_apic *)header; 86 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 87 p->id, p->address, p->global_irq_base); 88 } 89 break; 90 91 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 92 { 93 struct acpi_madt_interrupt_override *p = 94 (struct acpi_madt_interrupt_override *)header; 95 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 96 p->bus, p->source_irq, p->global_irq, 97 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 98 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 99 if (p->inti_flags & 100 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 101 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 102 p->inti_flags & 103 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 104 } 105 break; 106 107 case ACPI_MADT_TYPE_NMI_SOURCE: 108 { 109 struct acpi_madt_nmi_source *p = 110 (struct acpi_madt_nmi_source *)header; 111 pr_info("NMI_SRC (%s %s global_irq %d)\n", 112 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 113 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 114 p->global_irq); 115 } 116 break; 117 118 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 119 { 120 struct acpi_madt_local_apic_nmi *p = 121 (struct acpi_madt_local_apic_nmi *)header; 122 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 123 p->processor_id, 124 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 125 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 126 p->lint); 127 } 128 break; 129 130 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 131 { 132 u16 polarity, trigger; 133 struct acpi_madt_local_x2apic_nmi *p = 134 (struct acpi_madt_local_x2apic_nmi *)header; 135 136 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 137 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 138 139 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 140 p->uid, 141 mps_inti_flags_polarity[polarity], 142 mps_inti_flags_trigger[trigger], 143 p->lint); 144 } 145 break; 146 147 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 148 { 149 struct acpi_madt_local_apic_override *p = 150 (struct acpi_madt_local_apic_override *)header; 151 pr_info("LAPIC_ADDR_OVR (address[%p])\n", 152 (void *)(unsigned long)p->address); 153 } 154 break; 155 156 case ACPI_MADT_TYPE_IO_SAPIC: 157 { 158 struct acpi_madt_io_sapic *p = 159 (struct acpi_madt_io_sapic *)header; 160 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 161 p->id, (void *)(unsigned long)p->address, 162 p->global_irq_base); 163 } 164 break; 165 166 case ACPI_MADT_TYPE_LOCAL_SAPIC: 167 { 168 struct acpi_madt_local_sapic *p = 169 (struct acpi_madt_local_sapic *)header; 170 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 171 p->processor_id, p->id, p->eid, 172 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 173 } 174 break; 175 176 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 177 { 178 struct acpi_madt_interrupt_source *p = 179 (struct acpi_madt_interrupt_source *)header; 180 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", 181 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 182 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 183 p->type, p->id, p->eid, p->io_sapic_vector, 184 p->global_irq); 185 } 186 break; 187 188 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 189 { 190 struct acpi_madt_generic_interrupt *p = 191 (struct acpi_madt_generic_interrupt *)header; 192 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 193 p->uid, p->base_address, 194 p->arm_mpidr, 195 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 196 197 } 198 break; 199 200 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 201 { 202 struct acpi_madt_generic_distributor *p = 203 (struct acpi_madt_generic_distributor *)header; 204 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 205 p->gic_id, p->base_address, 206 p->global_irq_base); 207 } 208 break; 209 210 case ACPI_MADT_TYPE_CORE_PIC: 211 { 212 struct acpi_madt_core_pic *p = 213 (struct acpi_madt_core_pic *)header; 214 pr_debug("CORE PIC (processor_id[0x%02x] core_id[0x%02x] %s)\n", 215 p->processor_id, p->core_id, 216 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 217 } 218 break; 219 220 default: 221 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 222 header->type); 223 break; 224 } 225} 226 227static unsigned long __init 228acpi_get_entry_type(struct acpi_subtable_entry *entry) 229{ 230 switch (entry->type) { 231 case ACPI_SUBTABLE_COMMON: 232 return entry->hdr->common.type; 233 case ACPI_SUBTABLE_HMAT: 234 return entry->hdr->hmat.type; 235 } 236 return 0; 237} 238 239static unsigned long __init 240acpi_get_entry_length(struct acpi_subtable_entry *entry) 241{ 242 switch (entry->type) { 243 case ACPI_SUBTABLE_COMMON: 244 return entry->hdr->common.length; 245 case ACPI_SUBTABLE_HMAT: 246 return entry->hdr->hmat.length; 247 } 248 return 0; 249} 250 251static unsigned long __init 252acpi_get_subtable_header_length(struct acpi_subtable_entry *entry) 253{ 254 switch (entry->type) { 255 case ACPI_SUBTABLE_COMMON: 256 return sizeof(entry->hdr->common); 257 case ACPI_SUBTABLE_HMAT: 258 return sizeof(entry->hdr->hmat); 259 } 260 return 0; 261} 262 263static enum acpi_subtable_type __init 264acpi_get_subtable_type(char *id) 265{ 266 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0) 267 return ACPI_SUBTABLE_HMAT; 268 return ACPI_SUBTABLE_COMMON; 269} 270 271/** 272 * acpi_parse_entries_array - for each proc_num find a suitable subtable 273 * 274 * @id: table id (for debugging purposes) 275 * @table_size: size of the root table 276 * @table_header: where does the table start? 277 * @proc: array of acpi_subtable_proc struct containing entry id 278 * and associated handler with it 279 * @proc_num: how big proc is? 280 * @max_entries: how many entries can we process? 281 * 282 * For each proc_num find a subtable with proc->id and run proc->handler 283 * on it. Assumption is that there's only single handler for particular 284 * entry id. 285 * 286 * The table_size is not the size of the complete ACPI table (the length 287 * field in the header struct), but only the size of the root table; i.e., 288 * the offset from the very first byte of the complete ACPI table, to the 289 * first byte of the very first subtable. 290 * 291 * On success returns sum of all matching entries for all proc handlers. 292 * Otherwise, -ENODEV or -EINVAL is returned. 293 */ 294static int __init acpi_parse_entries_array(char *id, unsigned long table_size, 295 struct acpi_table_header *table_header, 296 struct acpi_subtable_proc *proc, int proc_num, 297 unsigned int max_entries) 298{ 299 struct acpi_subtable_entry entry; 300 unsigned long table_end, subtable_len, entry_len; 301 int count = 0; 302 int errs = 0; 303 int i; 304 305 table_end = (unsigned long)table_header + table_header->length; 306 307 /* Parse all entries looking for a match. */ 308 309 entry.type = acpi_get_subtable_type(id); 310 entry.hdr = (union acpi_subtable_headers *) 311 ((unsigned long)table_header + table_size); 312 subtable_len = acpi_get_subtable_header_length(&entry); 313 314 while (((unsigned long)entry.hdr) + subtable_len < table_end) { 315 if (max_entries && count >= max_entries) 316 break; 317 318 for (i = 0; i < proc_num; i++) { 319 if (acpi_get_entry_type(&entry) != proc[i].id) 320 continue; 321 if (!proc[i].handler || 322 (!errs && proc[i].handler(entry.hdr, table_end))) { 323 errs++; 324 continue; 325 } 326 327 proc[i].count++; 328 break; 329 } 330 if (i != proc_num) 331 count++; 332 333 /* 334 * If entry->length is 0, break from this loop to avoid 335 * infinite loop. 336 */ 337 entry_len = acpi_get_entry_length(&entry); 338 if (entry_len == 0) { 339 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); 340 return -EINVAL; 341 } 342 343 entry.hdr = (union acpi_subtable_headers *) 344 ((unsigned long)entry.hdr + entry_len); 345 } 346 347 if (max_entries && count > max_entries) { 348 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n", 349 id, proc->id, count); 350 } 351 352 return errs ? -EINVAL : count; 353} 354 355int __init acpi_table_parse_entries_array(char *id, 356 unsigned long table_size, 357 struct acpi_subtable_proc *proc, int proc_num, 358 unsigned int max_entries) 359{ 360 struct acpi_table_header *table_header = NULL; 361 int count; 362 u32 instance = 0; 363 364 if (acpi_disabled) 365 return -ENODEV; 366 367 if (!id) 368 return -EINVAL; 369 370 if (!table_size) 371 return -EINVAL; 372 373 if (!strncmp(id, ACPI_SIG_MADT, 4)) 374 instance = acpi_apic_instance; 375 376 acpi_get_table(id, instance, &table_header); 377 if (!table_header) { 378 pr_warn("%4.4s not present\n", id); 379 return -ENODEV; 380 } 381 382 count = acpi_parse_entries_array(id, table_size, table_header, 383 proc, proc_num, max_entries); 384 385 acpi_put_table(table_header); 386 return count; 387} 388 389int __init acpi_table_parse_entries(char *id, 390 unsigned long table_size, 391 int entry_id, 392 acpi_tbl_entry_handler handler, 393 unsigned int max_entries) 394{ 395 struct acpi_subtable_proc proc = { 396 .id = entry_id, 397 .handler = handler, 398 }; 399 400 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 401 max_entries); 402} 403 404int __init acpi_table_parse_madt(enum acpi_madt_type id, 405 acpi_tbl_entry_handler handler, unsigned int max_entries) 406{ 407 return acpi_table_parse_entries(ACPI_SIG_MADT, 408 sizeof(struct acpi_table_madt), id, 409 handler, max_entries); 410} 411 412/** 413 * acpi_table_parse - find table with @id, run @handler on it 414 * @id: table id to find 415 * @handler: handler to run 416 * 417 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 418 * run @handler on it. 419 * 420 * Return 0 if table found, -errno if not. 421 */ 422int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 423{ 424 struct acpi_table_header *table = NULL; 425 426 if (acpi_disabled) 427 return -ENODEV; 428 429 if (!id || !handler) 430 return -EINVAL; 431 432 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 433 acpi_get_table(id, acpi_apic_instance, &table); 434 else 435 acpi_get_table(id, 0, &table); 436 437 if (table) { 438 handler(table); 439 acpi_put_table(table); 440 return 0; 441 } else 442 return -ENODEV; 443} 444 445/* 446 * The BIOS is supposed to supply a single APIC/MADT, 447 * but some report two. Provide a knob to use either. 448 * (don't you wish instance 0 and 1 were not the same?) 449 */ 450static void __init check_multiple_madt(void) 451{ 452 struct acpi_table_header *table = NULL; 453 454 acpi_get_table(ACPI_SIG_MADT, 2, &table); 455 if (table) { 456 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 457 acpi_apic_instance); 458 pr_warn("If \"acpi_apic_instance=%d\" works better, " 459 "notify linux-acpi@vger.kernel.org\n", 460 acpi_apic_instance ? 0 : 2); 461 acpi_put_table(table); 462 463 } else 464 acpi_apic_instance = 0; 465 466 return; 467} 468 469static void acpi_table_taint(struct acpi_table_header *table) 470{ 471 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 472 table->signature, table->oem_table_id); 473 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 474} 475 476#ifdef CONFIG_ACPI_TABLE_UPGRADE 477static u64 acpi_tables_addr; 478static int all_tables_size; 479 480/* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 481static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 482{ 483 u8 sum = 0; 484 u8 *end = buffer + length; 485 486 while (buffer < end) 487 sum = (u8) (sum + *(buffer++)); 488 return sum; 489} 490 491/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 492static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = { 493 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, 494 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, 495 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, 496 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, 497 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, 498 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, 499 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, 500 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, 501 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, 502 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, 503 ACPI_SIG_NHLT }; 504 505#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 506 507#define NR_ACPI_INITRD_TABLES 64 508static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 509static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 510 511#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 512 513void __init acpi_table_upgrade(void) 514{ 515 void *data; 516 size_t size; 517 int sig, no, table_nr = 0, total_offset = 0; 518 long offset = 0; 519 struct acpi_table_header *table; 520 char cpio_path[32] = "kernel/firmware/acpi/"; 521 struct cpio_data file; 522 523 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) { 524 data = __initramfs_start; 525 size = __initramfs_size; 526 } else { 527 data = (void *)initrd_start; 528 size = initrd_end - initrd_start; 529 } 530 531 if (data == NULL || size == 0) 532 return; 533 534 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 535 file = find_cpio_data(cpio_path, data, size, &offset); 536 if (!file.data) 537 break; 538 539 data += offset; 540 size -= offset; 541 542 if (file.size < sizeof(struct acpi_table_header)) { 543 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 544 cpio_path, file.name); 545 continue; 546 } 547 548 table = file.data; 549 550 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++) 551 if (!memcmp(table->signature, table_sigs[sig], 4)) 552 break; 553 554 if (sig >= ARRAY_SIZE(table_sigs)) { 555 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 556 cpio_path, file.name); 557 continue; 558 } 559 if (file.size != table->length) { 560 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 561 cpio_path, file.name); 562 continue; 563 } 564 if (acpi_table_checksum(file.data, table->length)) { 565 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 566 cpio_path, file.name); 567 continue; 568 } 569 570 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 571 table->signature, cpio_path, file.name, table->length); 572 573 all_tables_size += table->length; 574 acpi_initrd_files[table_nr].data = file.data; 575 acpi_initrd_files[table_nr].size = file.size; 576 table_nr++; 577 } 578 if (table_nr == 0) 579 return; 580 581 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) { 582 pr_notice("kernel is locked down, ignoring table override\n"); 583 return; 584 } 585 586 acpi_tables_addr = 587 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, 588 all_tables_size, PAGE_SIZE); 589 if (!acpi_tables_addr) { 590 WARN_ON(1); 591 return; 592 } 593 /* 594 * Only calling e820_add_reserve does not work and the 595 * tables are invalid (memory got used) later. 596 * memblock_reserve works as expected and the tables won't get modified. 597 * But it's not enough on X86 because ioremap will 598 * complain later (used by acpi_os_map_memory) that the pages 599 * that should get mapped are not marked "reserved". 600 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 601 * works fine. 602 */ 603 memblock_reserve(acpi_tables_addr, all_tables_size); 604 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 605 606 /* 607 * early_ioremap only can remap 256k one time. If we map all 608 * tables one time, we will hit the limit. Need to map chunks 609 * one by one during copying the same as that in relocate_initrd(). 610 */ 611 for (no = 0; no < table_nr; no++) { 612 unsigned char *src_p = acpi_initrd_files[no].data; 613 phys_addr_t size = acpi_initrd_files[no].size; 614 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 615 phys_addr_t slop, clen; 616 char *dest_p; 617 618 total_offset += size; 619 620 while (size) { 621 slop = dest_addr & ~PAGE_MASK; 622 clen = size; 623 if (clen > MAP_CHUNK_SIZE - slop) 624 clen = MAP_CHUNK_SIZE - slop; 625 dest_p = early_memremap(dest_addr & PAGE_MASK, 626 clen + slop); 627 memcpy(dest_p + slop, src_p, clen); 628 early_memunmap(dest_p, clen + slop); 629 src_p += clen; 630 dest_addr += clen; 631 size -= clen; 632 } 633 } 634} 635 636static acpi_status 637acpi_table_initrd_override(struct acpi_table_header *existing_table, 638 acpi_physical_address *address, u32 *length) 639{ 640 int table_offset = 0; 641 int table_index = 0; 642 struct acpi_table_header *table; 643 u32 table_length; 644 645 *length = 0; 646 *address = 0; 647 if (!acpi_tables_addr) 648 return AE_OK; 649 650 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 651 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 652 ACPI_HEADER_SIZE); 653 if (table_offset + table->length > all_tables_size) { 654 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 655 WARN_ON(1); 656 return AE_OK; 657 } 658 659 table_length = table->length; 660 661 /* Only override tables matched */ 662 if (memcmp(existing_table->signature, table->signature, 4) || 663 memcmp(table->oem_id, existing_table->oem_id, 664 ACPI_OEM_ID_SIZE) || 665 memcmp(table->oem_table_id, existing_table->oem_table_id, 666 ACPI_OEM_TABLE_ID_SIZE)) { 667 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 668 goto next_table; 669 } 670 /* 671 * Mark the table to avoid being used in 672 * acpi_table_initrd_scan() and check the revision. 673 */ 674 if (test_and_set_bit(table_index, acpi_initrd_installed) || 675 existing_table->oem_revision >= table->oem_revision) { 676 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 677 goto next_table; 678 } 679 680 *length = table_length; 681 *address = acpi_tables_addr + table_offset; 682 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 683 table->signature, table->oem_id, 684 table->oem_table_id); 685 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 686 break; 687 688next_table: 689 table_offset += table_length; 690 table_index++; 691 } 692 return AE_OK; 693} 694 695static void __init acpi_table_initrd_scan(void) 696{ 697 int table_offset = 0; 698 int table_index = 0; 699 u32 table_length; 700 struct acpi_table_header *table; 701 702 if (!acpi_tables_addr) 703 return; 704 705 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 706 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 707 ACPI_HEADER_SIZE); 708 if (table_offset + table->length > all_tables_size) { 709 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 710 WARN_ON(1); 711 return; 712 } 713 714 table_length = table->length; 715 716 /* Skip RSDT/XSDT which should only be used for override */ 717 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 718 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 719 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 720 goto next_table; 721 } 722 /* 723 * Mark the table to avoid being used in 724 * acpi_table_initrd_override(). Though this is not possible 725 * because override is disabled in acpi_install_table(). 726 */ 727 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 728 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 729 goto next_table; 730 } 731 732 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 733 table->signature, table->oem_id, 734 table->oem_table_id); 735 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 736 acpi_install_table(acpi_tables_addr + table_offset, TRUE); 737next_table: 738 table_offset += table_length; 739 table_index++; 740 } 741} 742#else 743static acpi_status 744acpi_table_initrd_override(struct acpi_table_header *existing_table, 745 acpi_physical_address *address, 746 u32 *table_length) 747{ 748 *table_length = 0; 749 *address = 0; 750 return AE_OK; 751} 752 753static void __init acpi_table_initrd_scan(void) 754{ 755} 756#endif /* CONFIG_ACPI_TABLE_UPGRADE */ 757 758acpi_status 759acpi_os_physical_table_override(struct acpi_table_header *existing_table, 760 acpi_physical_address *address, 761 u32 *table_length) 762{ 763 return acpi_table_initrd_override(existing_table, address, 764 table_length); 765} 766 767#ifdef CONFIG_ACPI_CUSTOM_DSDT 768static void *amlcode __attribute__ ((weakref("AmlCode"))); 769static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); 770#endif 771 772acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, 773 struct acpi_table_header **new_table) 774{ 775 if (!existing_table || !new_table) 776 return AE_BAD_PARAMETER; 777 778 *new_table = NULL; 779 780#ifdef CONFIG_ACPI_CUSTOM_DSDT 781 if (!strncmp(existing_table->signature, "DSDT", 4)) { 782 *new_table = (struct acpi_table_header *)&amlcode; 783 if (!(*new_table)) 784 *new_table = (struct acpi_table_header *)&dsdt_amlcode; 785 } 786#endif 787 if (*new_table != NULL) 788 acpi_table_taint(existing_table); 789 return AE_OK; 790} 791 792/* 793 * acpi_locate_initial_tables() 794 * 795 * find RSDP, find and checksum SDT/XSDT. 796 * checksum all tables, print SDT/XSDT 797 * 798 * result: sdt_entry[] is initialized 799 */ 800 801int __init acpi_locate_initial_tables(void) 802{ 803 acpi_status status; 804 805 if (acpi_verify_table_checksum) { 806 pr_info("Early table checksum verification enabled\n"); 807 acpi_gbl_enable_table_validation = TRUE; 808 } else { 809 pr_info("Early table checksum verification disabled\n"); 810 acpi_gbl_enable_table_validation = FALSE; 811 } 812 813 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 814 if (ACPI_FAILURE(status)) 815 return -EINVAL; 816 817 return 0; 818} 819 820void __init acpi_reserve_initial_tables(void) 821{ 822 int i; 823 824 for (i = 0; i < ACPI_MAX_TABLES; i++) { 825 struct acpi_table_desc *table_desc = &initial_tables[i]; 826 u64 start = table_desc->address; 827 u64 size = table_desc->length; 828 829 if (!start || !size) 830 break; 831 832 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n", 833 table_desc->signature.ascii, start, start + size - 1); 834 835 memblock_reserve(start, size); 836 } 837} 838 839void __init acpi_table_init_complete(void) 840{ 841 acpi_table_initrd_scan(); 842 check_multiple_madt(); 843} 844 845int __init acpi_table_init(void) 846{ 847 int ret; 848 849 ret = acpi_locate_initial_tables(); 850 if (ret) 851 return ret; 852 853 acpi_table_init_complete(); 854 855 return 0; 856} 857 858static int __init acpi_parse_apic_instance(char *str) 859{ 860 if (!str) 861 return -EINVAL; 862 863 if (kstrtoint(str, 0, &acpi_apic_instance)) 864 return -EINVAL; 865 866 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 867 868 return 0; 869} 870early_param("acpi_apic_instance", acpi_parse_apic_instance); 871 872static int __init acpi_force_table_verification_setup(char *s) 873{ 874 acpi_verify_table_checksum = true; 875 876 return 0; 877} 878early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 879 880static int __init acpi_force_32bit_fadt_addr(char *s) 881{ 882 pr_info("Forcing 32 Bit FADT addresses\n"); 883 acpi_gbl_use32_bit_fadt_addresses = TRUE; 884 885 return 0; 886} 887early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 888