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 "internal.h" 24 25 #ifdef CONFIG_ACPI_CUSTOM_DSDT 26 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 27 #endif 28 29 #define ACPI_MAX_TABLES 128 30 31 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 32 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 33 34 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 35 36 static int acpi_apic_instance __initdata; 37 38 enum acpi_subtable_type { 39 ACPI_SUBTABLE_COMMON, 40 ACPI_SUBTABLE_HMAT, 41 }; 42 43 struct acpi_subtable_entry { 44 union acpi_subtable_headers *hdr; 45 enum acpi_subtable_type type; 46 }; 47 48 /* 49 * Disable table checksum verification for the early stage due to the size 50 * limitation of the current x86 early mapping implementation. 51 */ 52 static bool acpi_verify_table_checksum __initdata = false; 53 54 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 55 { 56 if (!header) 57 return; 58 59 switch (header->type) { 60 61 case ACPI_MADT_TYPE_LOCAL_APIC: 62 { 63 struct acpi_madt_local_apic *p = 64 (struct acpi_madt_local_apic *)header; 65 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 66 p->processor_id, p->id, 67 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 68 } 69 break; 70 71 case ACPI_MADT_TYPE_LOCAL_X2APIC: 72 { 73 struct acpi_madt_local_x2apic *p = 74 (struct acpi_madt_local_x2apic *)header; 75 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 76 p->local_apic_id, p->uid, 77 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 78 } 79 break; 80 81 case ACPI_MADT_TYPE_IO_APIC: 82 { 83 struct acpi_madt_io_apic *p = 84 (struct acpi_madt_io_apic *)header; 85 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 86 p->id, p->address, p->global_irq_base); 87 } 88 break; 89 90 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 91 { 92 struct acpi_madt_interrupt_override *p = 93 (struct acpi_madt_interrupt_override *)header; 94 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 95 p->bus, p->source_irq, p->global_irq, 96 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 97 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 98 if (p->inti_flags & 99 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 100 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 101 p->inti_flags & 102 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 103 } 104 break; 105 106 case ACPI_MADT_TYPE_NMI_SOURCE: 107 { 108 struct acpi_madt_nmi_source *p = 109 (struct acpi_madt_nmi_source *)header; 110 pr_info("NMI_SRC (%s %s global_irq %d)\n", 111 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 112 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 113 p->global_irq); 114 } 115 break; 116 117 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 118 { 119 struct acpi_madt_local_apic_nmi *p = 120 (struct acpi_madt_local_apic_nmi *)header; 121 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 122 p->processor_id, 123 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 124 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 125 p->lint); 126 } 127 break; 128 129 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 130 { 131 u16 polarity, trigger; 132 struct acpi_madt_local_x2apic_nmi *p = 133 (struct acpi_madt_local_x2apic_nmi *)header; 134 135 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 136 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 137 138 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 139 p->uid, 140 mps_inti_flags_polarity[polarity], 141 mps_inti_flags_trigger[trigger], 142 p->lint); 143 } 144 break; 145 146 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 147 { 148 struct acpi_madt_local_apic_override *p = 149 (struct acpi_madt_local_apic_override *)header; 150 pr_info("LAPIC_ADDR_OVR (address[%p])\n", 151 (void *)(unsigned long)p->address); 152 } 153 break; 154 155 case ACPI_MADT_TYPE_IO_SAPIC: 156 { 157 struct acpi_madt_io_sapic *p = 158 (struct acpi_madt_io_sapic *)header; 159 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 160 p->id, (void *)(unsigned long)p->address, 161 p->global_irq_base); 162 } 163 break; 164 165 case ACPI_MADT_TYPE_LOCAL_SAPIC: 166 { 167 struct acpi_madt_local_sapic *p = 168 (struct acpi_madt_local_sapic *)header; 169 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 170 p->processor_id, p->id, p->eid, 171 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 172 } 173 break; 174 175 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 176 { 177 struct acpi_madt_interrupt_source *p = 178 (struct acpi_madt_interrupt_source *)header; 179 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", 180 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 181 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 182 p->type, p->id, p->eid, p->io_sapic_vector, 183 p->global_irq); 184 } 185 break; 186 187 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 188 { 189 struct acpi_madt_generic_interrupt *p = 190 (struct acpi_madt_generic_interrupt *)header; 191 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 192 p->uid, p->base_address, 193 p->arm_mpidr, 194 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 195 196 } 197 break; 198 199 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 200 { 201 struct acpi_madt_generic_distributor *p = 202 (struct acpi_madt_generic_distributor *)header; 203 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 204 p->gic_id, p->base_address, 205 p->global_irq_base); 206 } 207 break; 208 209 default: 210 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 211 header->type); 212 break; 213 } 214 } 215 216 static unsigned long __init 217 acpi_get_entry_type(struct acpi_subtable_entry *entry) 218 { 219 switch (entry->type) { 220 case ACPI_SUBTABLE_COMMON: 221 return entry->hdr->common.type; 222 case ACPI_SUBTABLE_HMAT: 223 return entry->hdr->hmat.type; 224 } 225 return 0; 226 } 227 228 static unsigned long __init 229 acpi_get_entry_length(struct acpi_subtable_entry *entry) 230 { 231 switch (entry->type) { 232 case ACPI_SUBTABLE_COMMON: 233 return entry->hdr->common.length; 234 case ACPI_SUBTABLE_HMAT: 235 return entry->hdr->hmat.length; 236 } 237 return 0; 238 } 239 240 static unsigned long __init 241 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry) 242 { 243 switch (entry->type) { 244 case ACPI_SUBTABLE_COMMON: 245 return sizeof(entry->hdr->common); 246 case ACPI_SUBTABLE_HMAT: 247 return sizeof(entry->hdr->hmat); 248 } 249 return 0; 250 } 251 252 static enum acpi_subtable_type __init 253 acpi_get_subtable_type(char *id) 254 { 255 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0) 256 return ACPI_SUBTABLE_HMAT; 257 return ACPI_SUBTABLE_COMMON; 258 } 259 260 /** 261 * acpi_parse_entries_array - for each proc_num find a suitable subtable 262 * 263 * @id: table id (for debugging purposes) 264 * @table_size: size of the root table 265 * @table_header: where does the table start? 266 * @proc: array of acpi_subtable_proc struct containing entry id 267 * and associated handler with it 268 * @proc_num: how big proc is? 269 * @max_entries: how many entries can we process? 270 * 271 * For each proc_num find a subtable with proc->id and run proc->handler 272 * on it. Assumption is that there's only single handler for particular 273 * entry id. 274 * 275 * The table_size is not the size of the complete ACPI table (the length 276 * field in the header struct), but only the size of the root table; i.e., 277 * the offset from the very first byte of the complete ACPI table, to the 278 * first byte of the very first subtable. 279 * 280 * On success returns sum of all matching entries for all proc handlers. 281 * Otherwise, -ENODEV or -EINVAL is returned. 282 */ 283 static int __init acpi_parse_entries_array(char *id, unsigned long table_size, 284 struct acpi_table_header *table_header, 285 struct acpi_subtable_proc *proc, int proc_num, 286 unsigned int max_entries) 287 { 288 struct acpi_subtable_entry entry; 289 unsigned long table_end, subtable_len, entry_len; 290 int count = 0; 291 int errs = 0; 292 int i; 293 294 if (acpi_disabled) 295 return -ENODEV; 296 297 if (!id) 298 return -EINVAL; 299 300 if (!table_size) 301 return -EINVAL; 302 303 if (!table_header) { 304 pr_warn("%4.4s not present\n", id); 305 return -ENODEV; 306 } 307 308 table_end = (unsigned long)table_header + table_header->length; 309 310 /* Parse all entries looking for a match. */ 311 312 entry.type = acpi_get_subtable_type(id); 313 entry.hdr = (union acpi_subtable_headers *) 314 ((unsigned long)table_header + table_size); 315 subtable_len = acpi_get_subtable_header_length(&entry); 316 317 while (((unsigned long)entry.hdr) + subtable_len < table_end) { 318 if (max_entries && count >= max_entries) 319 break; 320 321 for (i = 0; i < proc_num; i++) { 322 if (acpi_get_entry_type(&entry) != proc[i].id) 323 continue; 324 if (!proc[i].handler || 325 (!errs && proc[i].handler(entry.hdr, table_end))) { 326 errs++; 327 continue; 328 } 329 330 proc[i].count++; 331 break; 332 } 333 if (i != proc_num) 334 count++; 335 336 /* 337 * If entry->length is 0, break from this loop to avoid 338 * infinite loop. 339 */ 340 entry_len = acpi_get_entry_length(&entry); 341 if (entry_len == 0) { 342 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); 343 return -EINVAL; 344 } 345 346 entry.hdr = (union acpi_subtable_headers *) 347 ((unsigned long)entry.hdr + entry_len); 348 } 349 350 if (max_entries && count > max_entries) { 351 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n", 352 id, proc->id, count); 353 } 354 355 return errs ? -EINVAL : count; 356 } 357 358 int __init acpi_table_parse_entries_array(char *id, 359 unsigned long table_size, 360 struct acpi_subtable_proc *proc, int proc_num, 361 unsigned int max_entries) 362 { 363 struct acpi_table_header *table_header = NULL; 364 int count; 365 u32 instance = 0; 366 367 if (acpi_disabled) 368 return -ENODEV; 369 370 if (!id) 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 } 388 389 int __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 } 403 404 int __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 */ 422 int __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 */ 450 static 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 } 468 469 static 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 477 static u64 acpi_tables_addr; 478 static int all_tables_size; 479 480 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 481 static 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: */ 492 static const char * const table_sigs[] = { 493 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 494 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 495 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 496 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 497 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 498 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 499 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 500 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 501 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT, 502 ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, NULL }; 503 504 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 505 506 #define NR_ACPI_INITRD_TABLES 64 507 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 508 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 509 510 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 511 512 void __init acpi_table_upgrade(void) 513 { 514 void *data; 515 size_t size; 516 int sig, no, table_nr = 0, total_offset = 0; 517 long offset = 0; 518 struct acpi_table_header *table; 519 char cpio_path[32] = "kernel/firmware/acpi/"; 520 struct cpio_data file; 521 522 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) { 523 data = __initramfs_start; 524 size = __initramfs_size; 525 } else { 526 data = (void *)initrd_start; 527 size = initrd_end - initrd_start; 528 } 529 530 if (data == NULL || size == 0) 531 return; 532 533 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 534 file = find_cpio_data(cpio_path, data, size, &offset); 535 if (!file.data) 536 break; 537 538 data += offset; 539 size -= offset; 540 541 if (file.size < sizeof(struct acpi_table_header)) { 542 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 543 cpio_path, file.name); 544 continue; 545 } 546 547 table = file.data; 548 549 for (sig = 0; table_sigs[sig]; sig++) 550 if (!memcmp(table->signature, table_sigs[sig], 4)) 551 break; 552 553 if (!table_sigs[sig]) { 554 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 555 cpio_path, file.name); 556 continue; 557 } 558 if (file.size != table->length) { 559 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 560 cpio_path, file.name); 561 continue; 562 } 563 if (acpi_table_checksum(file.data, table->length)) { 564 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 565 cpio_path, file.name); 566 continue; 567 } 568 569 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 570 table->signature, cpio_path, file.name, table->length); 571 572 all_tables_size += table->length; 573 acpi_initrd_files[table_nr].data = file.data; 574 acpi_initrd_files[table_nr].size = file.size; 575 table_nr++; 576 } 577 if (table_nr == 0) 578 return; 579 580 acpi_tables_addr = 581 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, 582 all_tables_size, PAGE_SIZE); 583 if (!acpi_tables_addr) { 584 WARN_ON(1); 585 return; 586 } 587 /* 588 * Only calling e820_add_reserve does not work and the 589 * tables are invalid (memory got used) later. 590 * memblock_reserve works as expected and the tables won't get modified. 591 * But it's not enough on X86 because ioremap will 592 * complain later (used by acpi_os_map_memory) that the pages 593 * that should get mapped are not marked "reserved". 594 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 595 * works fine. 596 */ 597 memblock_reserve(acpi_tables_addr, all_tables_size); 598 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 599 600 /* 601 * early_ioremap only can remap 256k one time. If we map all 602 * tables one time, we will hit the limit. Need to map chunks 603 * one by one during copying the same as that in relocate_initrd(). 604 */ 605 for (no = 0; no < table_nr; no++) { 606 unsigned char *src_p = acpi_initrd_files[no].data; 607 phys_addr_t size = acpi_initrd_files[no].size; 608 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 609 phys_addr_t slop, clen; 610 char *dest_p; 611 612 total_offset += size; 613 614 while (size) { 615 slop = dest_addr & ~PAGE_MASK; 616 clen = size; 617 if (clen > MAP_CHUNK_SIZE - slop) 618 clen = MAP_CHUNK_SIZE - slop; 619 dest_p = early_memremap(dest_addr & PAGE_MASK, 620 clen + slop); 621 memcpy(dest_p + slop, src_p, clen); 622 early_memunmap(dest_p, clen + slop); 623 src_p += clen; 624 dest_addr += clen; 625 size -= clen; 626 } 627 } 628 } 629 630 static acpi_status 631 acpi_table_initrd_override(struct acpi_table_header *existing_table, 632 acpi_physical_address *address, u32 *length) 633 { 634 int table_offset = 0; 635 int table_index = 0; 636 struct acpi_table_header *table; 637 u32 table_length; 638 639 *length = 0; 640 *address = 0; 641 if (!acpi_tables_addr) 642 return AE_OK; 643 644 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 645 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 646 ACPI_HEADER_SIZE); 647 if (table_offset + table->length > all_tables_size) { 648 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 649 WARN_ON(1); 650 return AE_OK; 651 } 652 653 table_length = table->length; 654 655 /* Only override tables matched */ 656 if (memcmp(existing_table->signature, table->signature, 4) || 657 memcmp(table->oem_id, existing_table->oem_id, 658 ACPI_OEM_ID_SIZE) || 659 memcmp(table->oem_table_id, existing_table->oem_table_id, 660 ACPI_OEM_TABLE_ID_SIZE)) { 661 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 662 goto next_table; 663 } 664 /* 665 * Mark the table to avoid being used in 666 * acpi_table_initrd_scan() and check the revision. 667 */ 668 if (test_and_set_bit(table_index, acpi_initrd_installed) || 669 existing_table->oem_revision >= table->oem_revision) { 670 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 671 goto next_table; 672 } 673 674 *length = table_length; 675 *address = acpi_tables_addr + table_offset; 676 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 677 table->signature, table->oem_id, 678 table->oem_table_id); 679 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 680 break; 681 682 next_table: 683 table_offset += table_length; 684 table_index++; 685 } 686 return AE_OK; 687 } 688 689 static void __init acpi_table_initrd_scan(void) 690 { 691 int table_offset = 0; 692 int table_index = 0; 693 u32 table_length; 694 struct acpi_table_header *table; 695 696 if (!acpi_tables_addr) 697 return; 698 699 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 700 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 701 ACPI_HEADER_SIZE); 702 if (table_offset + table->length > all_tables_size) { 703 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 704 WARN_ON(1); 705 return; 706 } 707 708 table_length = table->length; 709 710 /* Skip RSDT/XSDT which should only be used for override */ 711 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 712 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 713 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 714 goto next_table; 715 } 716 /* 717 * Mark the table to avoid being used in 718 * acpi_table_initrd_override(). Though this is not possible 719 * because override is disabled in acpi_install_table(). 720 */ 721 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 722 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 723 goto next_table; 724 } 725 726 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 727 table->signature, table->oem_id, 728 table->oem_table_id); 729 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 730 acpi_install_table(acpi_tables_addr + table_offset, TRUE); 731 next_table: 732 table_offset += table_length; 733 table_index++; 734 } 735 } 736 #else 737 static acpi_status 738 acpi_table_initrd_override(struct acpi_table_header *existing_table, 739 acpi_physical_address *address, 740 u32 *table_length) 741 { 742 *table_length = 0; 743 *address = 0; 744 return AE_OK; 745 } 746 747 static void __init acpi_table_initrd_scan(void) 748 { 749 } 750 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 751 752 acpi_status 753 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 754 acpi_physical_address *address, 755 u32 *table_length) 756 { 757 return acpi_table_initrd_override(existing_table, address, 758 table_length); 759 } 760 761 #ifdef CONFIG_ACPI_CUSTOM_DSDT 762 static void *amlcode __attribute__ ((weakref("AmlCode"))); 763 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); 764 #endif 765 766 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, 767 struct acpi_table_header **new_table) 768 { 769 if (!existing_table || !new_table) 770 return AE_BAD_PARAMETER; 771 772 *new_table = NULL; 773 774 #ifdef CONFIG_ACPI_CUSTOM_DSDT 775 if (!strncmp(existing_table->signature, "DSDT", 4)) { 776 *new_table = (struct acpi_table_header *)&amlcode; 777 if (!(*new_table)) 778 *new_table = (struct acpi_table_header *)&dsdt_amlcode; 779 } 780 #endif 781 if (*new_table != NULL) 782 acpi_table_taint(existing_table); 783 return AE_OK; 784 } 785 786 /* 787 * acpi_table_init() 788 * 789 * find RSDP, find and checksum SDT/XSDT. 790 * checksum all tables, print SDT/XSDT 791 * 792 * result: sdt_entry[] is initialized 793 */ 794 795 int __init acpi_table_init(void) 796 { 797 acpi_status status; 798 799 if (acpi_verify_table_checksum) { 800 pr_info("Early table checksum verification enabled\n"); 801 acpi_gbl_enable_table_validation = TRUE; 802 } else { 803 pr_info("Early table checksum verification disabled\n"); 804 acpi_gbl_enable_table_validation = FALSE; 805 } 806 807 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 808 if (ACPI_FAILURE(status)) 809 return -EINVAL; 810 acpi_table_initrd_scan(); 811 812 check_multiple_madt(); 813 return 0; 814 } 815 816 static int __init acpi_parse_apic_instance(char *str) 817 { 818 if (!str) 819 return -EINVAL; 820 821 if (kstrtoint(str, 0, &acpi_apic_instance)) 822 return -EINVAL; 823 824 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 825 826 return 0; 827 } 828 early_param("acpi_apic_instance", acpi_parse_apic_instance); 829 830 static int __init acpi_force_table_verification_setup(char *s) 831 { 832 acpi_verify_table_checksum = true; 833 834 return 0; 835 } 836 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 837 838 static int __init acpi_force_32bit_fadt_addr(char *s) 839 { 840 pr_info("Forcing 32 Bit FADT addresses\n"); 841 acpi_gbl_use32_bit_fadt_addresses = TRUE; 842 843 return 0; 844 } 845 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 846