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 32 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 33 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 34 35 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 36 37 static int acpi_apic_instance __initdata; 38 39 enum acpi_subtable_type { 40 ACPI_SUBTABLE_COMMON, 41 ACPI_SUBTABLE_HMAT, 42 }; 43 44 struct 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 */ 53 static bool acpi_verify_table_checksum __initdata = false; 54 55 void 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 default: 211 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 212 header->type); 213 break; 214 } 215 } 216 217 static unsigned long __init 218 acpi_get_entry_type(struct acpi_subtable_entry *entry) 219 { 220 switch (entry->type) { 221 case ACPI_SUBTABLE_COMMON: 222 return entry->hdr->common.type; 223 case ACPI_SUBTABLE_HMAT: 224 return entry->hdr->hmat.type; 225 } 226 return 0; 227 } 228 229 static unsigned long __init 230 acpi_get_entry_length(struct acpi_subtable_entry *entry) 231 { 232 switch (entry->type) { 233 case ACPI_SUBTABLE_COMMON: 234 return entry->hdr->common.length; 235 case ACPI_SUBTABLE_HMAT: 236 return entry->hdr->hmat.length; 237 } 238 return 0; 239 } 240 241 static unsigned long __init 242 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry) 243 { 244 switch (entry->type) { 245 case ACPI_SUBTABLE_COMMON: 246 return sizeof(entry->hdr->common); 247 case ACPI_SUBTABLE_HMAT: 248 return sizeof(entry->hdr->hmat); 249 } 250 return 0; 251 } 252 253 static enum acpi_subtable_type __init 254 acpi_get_subtable_type(char *id) 255 { 256 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0) 257 return ACPI_SUBTABLE_HMAT; 258 return ACPI_SUBTABLE_COMMON; 259 } 260 261 /** 262 * acpi_parse_entries_array - for each proc_num find a suitable subtable 263 * 264 * @id: table id (for debugging purposes) 265 * @table_size: size of the root table 266 * @table_header: where does the table start? 267 * @proc: array of acpi_subtable_proc struct containing entry id 268 * and associated handler with it 269 * @proc_num: how big proc is? 270 * @max_entries: how many entries can we process? 271 * 272 * For each proc_num find a subtable with proc->id and run proc->handler 273 * on it. Assumption is that there's only single handler for particular 274 * entry id. 275 * 276 * The table_size is not the size of the complete ACPI table (the length 277 * field in the header struct), but only the size of the root table; i.e., 278 * the offset from the very first byte of the complete ACPI table, to the 279 * first byte of the very first subtable. 280 * 281 * On success returns sum of all matching entries for all proc handlers. 282 * Otherwise, -ENODEV or -EINVAL is returned. 283 */ 284 static int __init acpi_parse_entries_array(char *id, unsigned long table_size, 285 struct acpi_table_header *table_header, 286 struct acpi_subtable_proc *proc, int proc_num, 287 unsigned int max_entries) 288 { 289 struct acpi_subtable_entry entry; 290 unsigned long table_end, subtable_len, entry_len; 291 int count = 0; 292 int errs = 0; 293 int i; 294 295 if (acpi_disabled) 296 return -ENODEV; 297 298 if (!id) 299 return -EINVAL; 300 301 if (!table_size) 302 return -EINVAL; 303 304 if (!table_header) { 305 pr_warn("%4.4s not present\n", id); 306 return -ENODEV; 307 } 308 309 table_end = (unsigned long)table_header + table_header->length; 310 311 /* Parse all entries looking for a match. */ 312 313 entry.type = acpi_get_subtable_type(id); 314 entry.hdr = (union acpi_subtable_headers *) 315 ((unsigned long)table_header + table_size); 316 subtable_len = acpi_get_subtable_header_length(&entry); 317 318 while (((unsigned long)entry.hdr) + subtable_len < table_end) { 319 if (max_entries && count >= max_entries) 320 break; 321 322 for (i = 0; i < proc_num; i++) { 323 if (acpi_get_entry_type(&entry) != proc[i].id) 324 continue; 325 if (!proc[i].handler || 326 (!errs && proc[i].handler(entry.hdr, table_end))) { 327 errs++; 328 continue; 329 } 330 331 proc[i].count++; 332 break; 333 } 334 if (i != proc_num) 335 count++; 336 337 /* 338 * If entry->length is 0, break from this loop to avoid 339 * infinite loop. 340 */ 341 entry_len = acpi_get_entry_length(&entry); 342 if (entry_len == 0) { 343 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); 344 return -EINVAL; 345 } 346 347 entry.hdr = (union acpi_subtable_headers *) 348 ((unsigned long)entry.hdr + entry_len); 349 } 350 351 if (max_entries && count > max_entries) { 352 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n", 353 id, proc->id, count); 354 } 355 356 return errs ? -EINVAL : count; 357 } 358 359 int __init acpi_table_parse_entries_array(char *id, 360 unsigned long table_size, 361 struct acpi_subtable_proc *proc, int proc_num, 362 unsigned int max_entries) 363 { 364 struct acpi_table_header *table_header = NULL; 365 int count; 366 u32 instance = 0; 367 368 if (acpi_disabled) 369 return -ENODEV; 370 371 if (!id) 372 return -EINVAL; 373 374 if (!strncmp(id, ACPI_SIG_MADT, 4)) 375 instance = acpi_apic_instance; 376 377 acpi_get_table(id, instance, &table_header); 378 if (!table_header) { 379 pr_warn("%4.4s not present\n", id); 380 return -ENODEV; 381 } 382 383 count = acpi_parse_entries_array(id, table_size, table_header, 384 proc, proc_num, max_entries); 385 386 acpi_put_table(table_header); 387 return count; 388 } 389 390 int __init acpi_table_parse_entries(char *id, 391 unsigned long table_size, 392 int entry_id, 393 acpi_tbl_entry_handler handler, 394 unsigned int max_entries) 395 { 396 struct acpi_subtable_proc proc = { 397 .id = entry_id, 398 .handler = handler, 399 }; 400 401 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 402 max_entries); 403 } 404 405 int __init acpi_table_parse_madt(enum acpi_madt_type id, 406 acpi_tbl_entry_handler handler, unsigned int max_entries) 407 { 408 return acpi_table_parse_entries(ACPI_SIG_MADT, 409 sizeof(struct acpi_table_madt), id, 410 handler, max_entries); 411 } 412 413 /** 414 * acpi_table_parse - find table with @id, run @handler on it 415 * @id: table id to find 416 * @handler: handler to run 417 * 418 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 419 * run @handler on it. 420 * 421 * Return 0 if table found, -errno if not. 422 */ 423 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 424 { 425 struct acpi_table_header *table = NULL; 426 427 if (acpi_disabled) 428 return -ENODEV; 429 430 if (!id || !handler) 431 return -EINVAL; 432 433 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 434 acpi_get_table(id, acpi_apic_instance, &table); 435 else 436 acpi_get_table(id, 0, &table); 437 438 if (table) { 439 handler(table); 440 acpi_put_table(table); 441 return 0; 442 } else 443 return -ENODEV; 444 } 445 446 /* 447 * The BIOS is supposed to supply a single APIC/MADT, 448 * but some report two. Provide a knob to use either. 449 * (don't you wish instance 0 and 1 were not the same?) 450 */ 451 static void __init check_multiple_madt(void) 452 { 453 struct acpi_table_header *table = NULL; 454 455 acpi_get_table(ACPI_SIG_MADT, 2, &table); 456 if (table) { 457 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 458 acpi_apic_instance); 459 pr_warn("If \"acpi_apic_instance=%d\" works better, " 460 "notify linux-acpi@vger.kernel.org\n", 461 acpi_apic_instance ? 0 : 2); 462 acpi_put_table(table); 463 464 } else 465 acpi_apic_instance = 0; 466 467 return; 468 } 469 470 static void acpi_table_taint(struct acpi_table_header *table) 471 { 472 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 473 table->signature, table->oem_table_id); 474 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 475 } 476 477 #ifdef CONFIG_ACPI_TABLE_UPGRADE 478 static u64 acpi_tables_addr; 479 static int all_tables_size; 480 481 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 482 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 483 { 484 u8 sum = 0; 485 u8 *end = buffer + length; 486 487 while (buffer < end) 488 sum = (u8) (sum + *(buffer++)); 489 return sum; 490 } 491 492 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 493 static const char * const table_sigs[] = { 494 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, 495 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, 496 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, 497 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, 498 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, 499 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, 500 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, 501 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, 502 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, 503 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, 504 NULL }; 505 506 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 507 508 #define NR_ACPI_INITRD_TABLES 64 509 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 510 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 511 512 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 513 514 void __init acpi_table_upgrade(void) 515 { 516 void *data; 517 size_t size; 518 int sig, no, table_nr = 0, total_offset = 0; 519 long offset = 0; 520 struct acpi_table_header *table; 521 char cpio_path[32] = "kernel/firmware/acpi/"; 522 struct cpio_data file; 523 524 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) { 525 data = __initramfs_start; 526 size = __initramfs_size; 527 } else { 528 data = (void *)initrd_start; 529 size = initrd_end - initrd_start; 530 } 531 532 if (data == NULL || size == 0) 533 return; 534 535 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 536 file = find_cpio_data(cpio_path, data, size, &offset); 537 if (!file.data) 538 break; 539 540 data += offset; 541 size -= offset; 542 543 if (file.size < sizeof(struct acpi_table_header)) { 544 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 545 cpio_path, file.name); 546 continue; 547 } 548 549 table = file.data; 550 551 for (sig = 0; table_sigs[sig]; sig++) 552 if (!memcmp(table->signature, table_sigs[sig], 4)) 553 break; 554 555 if (!table_sigs[sig]) { 556 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 557 cpio_path, file.name); 558 continue; 559 } 560 if (file.size != table->length) { 561 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 562 cpio_path, file.name); 563 continue; 564 } 565 if (acpi_table_checksum(file.data, table->length)) { 566 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 567 cpio_path, file.name); 568 continue; 569 } 570 571 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 572 table->signature, cpio_path, file.name, table->length); 573 574 all_tables_size += table->length; 575 acpi_initrd_files[table_nr].data = file.data; 576 acpi_initrd_files[table_nr].size = file.size; 577 table_nr++; 578 } 579 if (table_nr == 0) 580 return; 581 582 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) { 583 pr_notice("kernel is locked down, ignoring table override\n"); 584 return; 585 } 586 587 acpi_tables_addr = 588 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, 589 all_tables_size, PAGE_SIZE); 590 if (!acpi_tables_addr) { 591 WARN_ON(1); 592 return; 593 } 594 /* 595 * Only calling e820_add_reserve does not work and the 596 * tables are invalid (memory got used) later. 597 * memblock_reserve works as expected and the tables won't get modified. 598 * But it's not enough on X86 because ioremap will 599 * complain later (used by acpi_os_map_memory) that the pages 600 * that should get mapped are not marked "reserved". 601 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 602 * works fine. 603 */ 604 memblock_reserve(acpi_tables_addr, all_tables_size); 605 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 606 607 /* 608 * early_ioremap only can remap 256k one time. If we map all 609 * tables one time, we will hit the limit. Need to map chunks 610 * one by one during copying the same as that in relocate_initrd(). 611 */ 612 for (no = 0; no < table_nr; no++) { 613 unsigned char *src_p = acpi_initrd_files[no].data; 614 phys_addr_t size = acpi_initrd_files[no].size; 615 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 616 phys_addr_t slop, clen; 617 char *dest_p; 618 619 total_offset += size; 620 621 while (size) { 622 slop = dest_addr & ~PAGE_MASK; 623 clen = size; 624 if (clen > MAP_CHUNK_SIZE - slop) 625 clen = MAP_CHUNK_SIZE - slop; 626 dest_p = early_memremap(dest_addr & PAGE_MASK, 627 clen + slop); 628 memcpy(dest_p + slop, src_p, clen); 629 early_memunmap(dest_p, clen + slop); 630 src_p += clen; 631 dest_addr += clen; 632 size -= clen; 633 } 634 } 635 } 636 637 static acpi_status 638 acpi_table_initrd_override(struct acpi_table_header *existing_table, 639 acpi_physical_address *address, u32 *length) 640 { 641 int table_offset = 0; 642 int table_index = 0; 643 struct acpi_table_header *table; 644 u32 table_length; 645 646 *length = 0; 647 *address = 0; 648 if (!acpi_tables_addr) 649 return AE_OK; 650 651 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 652 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 653 ACPI_HEADER_SIZE); 654 if (table_offset + table->length > all_tables_size) { 655 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 656 WARN_ON(1); 657 return AE_OK; 658 } 659 660 table_length = table->length; 661 662 /* Only override tables matched */ 663 if (memcmp(existing_table->signature, table->signature, 4) || 664 memcmp(table->oem_id, existing_table->oem_id, 665 ACPI_OEM_ID_SIZE) || 666 memcmp(table->oem_table_id, existing_table->oem_table_id, 667 ACPI_OEM_TABLE_ID_SIZE)) { 668 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 669 goto next_table; 670 } 671 /* 672 * Mark the table to avoid being used in 673 * acpi_table_initrd_scan() and check the revision. 674 */ 675 if (test_and_set_bit(table_index, acpi_initrd_installed) || 676 existing_table->oem_revision >= table->oem_revision) { 677 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 678 goto next_table; 679 } 680 681 *length = table_length; 682 *address = acpi_tables_addr + table_offset; 683 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 684 table->signature, table->oem_id, 685 table->oem_table_id); 686 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 687 break; 688 689 next_table: 690 table_offset += table_length; 691 table_index++; 692 } 693 return AE_OK; 694 } 695 696 static void __init acpi_table_initrd_scan(void) 697 { 698 int table_offset = 0; 699 int table_index = 0; 700 u32 table_length; 701 struct acpi_table_header *table; 702 703 if (!acpi_tables_addr) 704 return; 705 706 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 707 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 708 ACPI_HEADER_SIZE); 709 if (table_offset + table->length > all_tables_size) { 710 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 711 WARN_ON(1); 712 return; 713 } 714 715 table_length = table->length; 716 717 /* Skip RSDT/XSDT which should only be used for override */ 718 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 719 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 720 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 721 goto next_table; 722 } 723 /* 724 * Mark the table to avoid being used in 725 * acpi_table_initrd_override(). Though this is not possible 726 * because override is disabled in acpi_install_table(). 727 */ 728 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 729 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 730 goto next_table; 731 } 732 733 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 734 table->signature, table->oem_id, 735 table->oem_table_id); 736 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 737 acpi_install_table(acpi_tables_addr + table_offset, TRUE); 738 next_table: 739 table_offset += table_length; 740 table_index++; 741 } 742 } 743 #else 744 static acpi_status 745 acpi_table_initrd_override(struct acpi_table_header *existing_table, 746 acpi_physical_address *address, 747 u32 *table_length) 748 { 749 *table_length = 0; 750 *address = 0; 751 return AE_OK; 752 } 753 754 static void __init acpi_table_initrd_scan(void) 755 { 756 } 757 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 758 759 acpi_status 760 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 761 acpi_physical_address *address, 762 u32 *table_length) 763 { 764 return acpi_table_initrd_override(existing_table, address, 765 table_length); 766 } 767 768 #ifdef CONFIG_ACPI_CUSTOM_DSDT 769 static void *amlcode __attribute__ ((weakref("AmlCode"))); 770 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); 771 #endif 772 773 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, 774 struct acpi_table_header **new_table) 775 { 776 if (!existing_table || !new_table) 777 return AE_BAD_PARAMETER; 778 779 *new_table = NULL; 780 781 #ifdef CONFIG_ACPI_CUSTOM_DSDT 782 if (!strncmp(existing_table->signature, "DSDT", 4)) { 783 *new_table = (struct acpi_table_header *)&amlcode; 784 if (!(*new_table)) 785 *new_table = (struct acpi_table_header *)&dsdt_amlcode; 786 } 787 #endif 788 if (*new_table != NULL) 789 acpi_table_taint(existing_table); 790 return AE_OK; 791 } 792 793 /* 794 * acpi_table_init() 795 * 796 * find RSDP, find and checksum SDT/XSDT. 797 * checksum all tables, print SDT/XSDT 798 * 799 * result: sdt_entry[] is initialized 800 */ 801 802 int __init acpi_table_init(void) 803 { 804 acpi_status status; 805 806 if (acpi_verify_table_checksum) { 807 pr_info("Early table checksum verification enabled\n"); 808 acpi_gbl_enable_table_validation = TRUE; 809 } else { 810 pr_info("Early table checksum verification disabled\n"); 811 acpi_gbl_enable_table_validation = FALSE; 812 } 813 814 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 815 if (ACPI_FAILURE(status)) 816 return -EINVAL; 817 acpi_table_initrd_scan(); 818 819 check_multiple_madt(); 820 return 0; 821 } 822 823 static int __init acpi_parse_apic_instance(char *str) 824 { 825 if (!str) 826 return -EINVAL; 827 828 if (kstrtoint(str, 0, &acpi_apic_instance)) 829 return -EINVAL; 830 831 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 832 833 return 0; 834 } 835 early_param("acpi_apic_instance", acpi_parse_apic_instance); 836 837 static int __init acpi_force_table_verification_setup(char *s) 838 { 839 acpi_verify_table_checksum = true; 840 841 return 0; 842 } 843 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 844 845 static int __init acpi_force_32bit_fadt_addr(char *s) 846 { 847 pr_info("Forcing 32 Bit FADT addresses\n"); 848 acpi_gbl_use32_bit_fadt_addresses = TRUE; 849 850 return 0; 851 } 852 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 853