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_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 NULL }; 504 505 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 506 507 #define NR_ACPI_INITRD_TABLES 64 508 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 509 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 510 511 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 512 513 void __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; table_sigs[sig]; sig++) 551 if (!memcmp(table->signature, table_sigs[sig], 4)) 552 break; 553 554 if (!table_sigs[sig]) { 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 acpi_tables_addr = 582 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, 583 all_tables_size, PAGE_SIZE); 584 if (!acpi_tables_addr) { 585 WARN_ON(1); 586 return; 587 } 588 /* 589 * Only calling e820_add_reserve does not work and the 590 * tables are invalid (memory got used) later. 591 * memblock_reserve works as expected and the tables won't get modified. 592 * But it's not enough on X86 because ioremap will 593 * complain later (used by acpi_os_map_memory) that the pages 594 * that should get mapped are not marked "reserved". 595 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 596 * works fine. 597 */ 598 memblock_reserve(acpi_tables_addr, all_tables_size); 599 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 600 601 /* 602 * early_ioremap only can remap 256k one time. If we map all 603 * tables one time, we will hit the limit. Need to map chunks 604 * one by one during copying the same as that in relocate_initrd(). 605 */ 606 for (no = 0; no < table_nr; no++) { 607 unsigned char *src_p = acpi_initrd_files[no].data; 608 phys_addr_t size = acpi_initrd_files[no].size; 609 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 610 phys_addr_t slop, clen; 611 char *dest_p; 612 613 total_offset += size; 614 615 while (size) { 616 slop = dest_addr & ~PAGE_MASK; 617 clen = size; 618 if (clen > MAP_CHUNK_SIZE - slop) 619 clen = MAP_CHUNK_SIZE - slop; 620 dest_p = early_memremap(dest_addr & PAGE_MASK, 621 clen + slop); 622 memcpy(dest_p + slop, src_p, clen); 623 early_memunmap(dest_p, clen + slop); 624 src_p += clen; 625 dest_addr += clen; 626 size -= clen; 627 } 628 } 629 } 630 631 static acpi_status 632 acpi_table_initrd_override(struct acpi_table_header *existing_table, 633 acpi_physical_address *address, u32 *length) 634 { 635 int table_offset = 0; 636 int table_index = 0; 637 struct acpi_table_header *table; 638 u32 table_length; 639 640 *length = 0; 641 *address = 0; 642 if (!acpi_tables_addr) 643 return AE_OK; 644 645 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 646 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 647 ACPI_HEADER_SIZE); 648 if (table_offset + table->length > all_tables_size) { 649 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 650 WARN_ON(1); 651 return AE_OK; 652 } 653 654 table_length = table->length; 655 656 /* Only override tables matched */ 657 if (memcmp(existing_table->signature, table->signature, 4) || 658 memcmp(table->oem_id, existing_table->oem_id, 659 ACPI_OEM_ID_SIZE) || 660 memcmp(table->oem_table_id, existing_table->oem_table_id, 661 ACPI_OEM_TABLE_ID_SIZE)) { 662 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 663 goto next_table; 664 } 665 /* 666 * Mark the table to avoid being used in 667 * acpi_table_initrd_scan() and check the revision. 668 */ 669 if (test_and_set_bit(table_index, acpi_initrd_installed) || 670 existing_table->oem_revision >= table->oem_revision) { 671 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 672 goto next_table; 673 } 674 675 *length = table_length; 676 *address = acpi_tables_addr + table_offset; 677 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 678 table->signature, table->oem_id, 679 table->oem_table_id); 680 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 681 break; 682 683 next_table: 684 table_offset += table_length; 685 table_index++; 686 } 687 return AE_OK; 688 } 689 690 static void __init acpi_table_initrd_scan(void) 691 { 692 int table_offset = 0; 693 int table_index = 0; 694 u32 table_length; 695 struct acpi_table_header *table; 696 697 if (!acpi_tables_addr) 698 return; 699 700 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 701 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 702 ACPI_HEADER_SIZE); 703 if (table_offset + table->length > all_tables_size) { 704 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 705 WARN_ON(1); 706 return; 707 } 708 709 table_length = table->length; 710 711 /* Skip RSDT/XSDT which should only be used for override */ 712 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 713 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 714 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 715 goto next_table; 716 } 717 /* 718 * Mark the table to avoid being used in 719 * acpi_table_initrd_override(). Though this is not possible 720 * because override is disabled in acpi_install_table(). 721 */ 722 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 723 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 724 goto next_table; 725 } 726 727 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 728 table->signature, table->oem_id, 729 table->oem_table_id); 730 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 731 acpi_install_table(acpi_tables_addr + table_offset, TRUE); 732 next_table: 733 table_offset += table_length; 734 table_index++; 735 } 736 } 737 #else 738 static acpi_status 739 acpi_table_initrd_override(struct acpi_table_header *existing_table, 740 acpi_physical_address *address, 741 u32 *table_length) 742 { 743 *table_length = 0; 744 *address = 0; 745 return AE_OK; 746 } 747 748 static void __init acpi_table_initrd_scan(void) 749 { 750 } 751 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 752 753 acpi_status 754 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 755 acpi_physical_address *address, 756 u32 *table_length) 757 { 758 return acpi_table_initrd_override(existing_table, address, 759 table_length); 760 } 761 762 #ifdef CONFIG_ACPI_CUSTOM_DSDT 763 static void *amlcode __attribute__ ((weakref("AmlCode"))); 764 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); 765 #endif 766 767 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, 768 struct acpi_table_header **new_table) 769 { 770 if (!existing_table || !new_table) 771 return AE_BAD_PARAMETER; 772 773 *new_table = NULL; 774 775 #ifdef CONFIG_ACPI_CUSTOM_DSDT 776 if (!strncmp(existing_table->signature, "DSDT", 4)) { 777 *new_table = (struct acpi_table_header *)&amlcode; 778 if (!(*new_table)) 779 *new_table = (struct acpi_table_header *)&dsdt_amlcode; 780 } 781 #endif 782 if (*new_table != NULL) 783 acpi_table_taint(existing_table); 784 return AE_OK; 785 } 786 787 /* 788 * acpi_table_init() 789 * 790 * find RSDP, find and checksum SDT/XSDT. 791 * checksum all tables, print SDT/XSDT 792 * 793 * result: sdt_entry[] is initialized 794 */ 795 796 int __init acpi_table_init(void) 797 { 798 acpi_status status; 799 800 if (acpi_verify_table_checksum) { 801 pr_info("Early table checksum verification enabled\n"); 802 acpi_gbl_enable_table_validation = TRUE; 803 } else { 804 pr_info("Early table checksum verification disabled\n"); 805 acpi_gbl_enable_table_validation = FALSE; 806 } 807 808 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 809 if (ACPI_FAILURE(status)) 810 return -EINVAL; 811 acpi_table_initrd_scan(); 812 813 check_multiple_madt(); 814 return 0; 815 } 816 817 static int __init acpi_parse_apic_instance(char *str) 818 { 819 if (!str) 820 return -EINVAL; 821 822 if (kstrtoint(str, 0, &acpi_apic_instance)) 823 return -EINVAL; 824 825 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 826 827 return 0; 828 } 829 early_param("acpi_apic_instance", acpi_parse_apic_instance); 830 831 static int __init acpi_force_table_verification_setup(char *s) 832 { 833 acpi_verify_table_checksum = true; 834 835 return 0; 836 } 837 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 838 839 static int __init acpi_force_32bit_fadt_addr(char *s) 840 { 841 pr_info("Forcing 32 Bit FADT addresses\n"); 842 acpi_gbl_use32_bit_fadt_addresses = TRUE; 843 844 return 0; 845 } 846 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 847