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