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 <linux/kmemleak.h> 25 #include "internal.h" 26 27 #ifdef CONFIG_ACPI_CUSTOM_DSDT 28 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 29 #endif 30 31 #define ACPI_MAX_TABLES 128 32 33 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 34 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 35 36 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 37 38 static int acpi_apic_instance __initdata; 39 40 enum acpi_subtable_type { 41 ACPI_SUBTABLE_COMMON, 42 ACPI_SUBTABLE_HMAT, 43 ACPI_SUBTABLE_PRMT, 44 }; 45 46 struct acpi_subtable_entry { 47 union acpi_subtable_headers *hdr; 48 enum acpi_subtable_type type; 49 }; 50 51 /* 52 * Disable table checksum verification for the early stage due to the size 53 * limitation of the current x86 early mapping implementation. 54 */ 55 static bool acpi_verify_table_checksum __initdata = false; 56 57 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 58 { 59 if (!header) 60 return; 61 62 switch (header->type) { 63 64 case ACPI_MADT_TYPE_LOCAL_APIC: 65 { 66 struct acpi_madt_local_apic *p = 67 (struct acpi_madt_local_apic *)header; 68 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 69 p->processor_id, p->id, 70 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 71 } 72 break; 73 74 case ACPI_MADT_TYPE_LOCAL_X2APIC: 75 { 76 struct acpi_madt_local_x2apic *p = 77 (struct acpi_madt_local_x2apic *)header; 78 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 79 p->local_apic_id, p->uid, 80 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 81 } 82 break; 83 84 case ACPI_MADT_TYPE_IO_APIC: 85 { 86 struct acpi_madt_io_apic *p = 87 (struct acpi_madt_io_apic *)header; 88 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 89 p->id, p->address, p->global_irq_base); 90 } 91 break; 92 93 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 94 { 95 struct acpi_madt_interrupt_override *p = 96 (struct acpi_madt_interrupt_override *)header; 97 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 98 p->bus, p->source_irq, p->global_irq, 99 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 100 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 101 if (p->inti_flags & 102 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 103 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 104 p->inti_flags & 105 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 106 } 107 break; 108 109 case ACPI_MADT_TYPE_NMI_SOURCE: 110 { 111 struct acpi_madt_nmi_source *p = 112 (struct acpi_madt_nmi_source *)header; 113 pr_info("NMI_SRC (%s %s global_irq %d)\n", 114 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 115 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 116 p->global_irq); 117 } 118 break; 119 120 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 121 { 122 struct acpi_madt_local_apic_nmi *p = 123 (struct acpi_madt_local_apic_nmi *)header; 124 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 125 p->processor_id, 126 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 127 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 128 p->lint); 129 } 130 break; 131 132 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 133 { 134 u16 polarity, trigger; 135 struct acpi_madt_local_x2apic_nmi *p = 136 (struct acpi_madt_local_x2apic_nmi *)header; 137 138 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 139 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 140 141 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 142 p->uid, 143 mps_inti_flags_polarity[polarity], 144 mps_inti_flags_trigger[trigger], 145 p->lint); 146 } 147 break; 148 149 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 150 { 151 struct acpi_madt_local_apic_override *p = 152 (struct acpi_madt_local_apic_override *)header; 153 pr_info("LAPIC_ADDR_OVR (address[%p])\n", 154 (void *)(unsigned long)p->address); 155 } 156 break; 157 158 case ACPI_MADT_TYPE_IO_SAPIC: 159 { 160 struct acpi_madt_io_sapic *p = 161 (struct acpi_madt_io_sapic *)header; 162 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 163 p->id, (void *)(unsigned long)p->address, 164 p->global_irq_base); 165 } 166 break; 167 168 case ACPI_MADT_TYPE_LOCAL_SAPIC: 169 { 170 struct acpi_madt_local_sapic *p = 171 (struct acpi_madt_local_sapic *)header; 172 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 173 p->processor_id, p->id, p->eid, 174 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 175 } 176 break; 177 178 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 179 { 180 struct acpi_madt_interrupt_source *p = 181 (struct acpi_madt_interrupt_source *)header; 182 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", 183 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 184 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 185 p->type, p->id, p->eid, p->io_sapic_vector, 186 p->global_irq); 187 } 188 break; 189 190 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 191 { 192 struct acpi_madt_generic_interrupt *p = 193 (struct acpi_madt_generic_interrupt *)header; 194 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 195 p->uid, p->base_address, 196 p->arm_mpidr, 197 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 198 199 } 200 break; 201 202 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 203 { 204 struct acpi_madt_generic_distributor *p = 205 (struct acpi_madt_generic_distributor *)header; 206 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 207 p->gic_id, p->base_address, 208 p->global_irq_base); 209 } 210 break; 211 212 default: 213 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 214 header->type); 215 break; 216 } 217 } 218 219 static unsigned long __init 220 acpi_get_entry_type(struct acpi_subtable_entry *entry) 221 { 222 switch (entry->type) { 223 case ACPI_SUBTABLE_COMMON: 224 return entry->hdr->common.type; 225 case ACPI_SUBTABLE_HMAT: 226 return entry->hdr->hmat.type; 227 case ACPI_SUBTABLE_PRMT: 228 return 0; 229 } 230 return 0; 231 } 232 233 static unsigned long __init 234 acpi_get_entry_length(struct acpi_subtable_entry *entry) 235 { 236 switch (entry->type) { 237 case ACPI_SUBTABLE_COMMON: 238 return entry->hdr->common.length; 239 case ACPI_SUBTABLE_HMAT: 240 return entry->hdr->hmat.length; 241 case ACPI_SUBTABLE_PRMT: 242 return entry->hdr->prmt.length; 243 } 244 return 0; 245 } 246 247 static unsigned long __init 248 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry) 249 { 250 switch (entry->type) { 251 case ACPI_SUBTABLE_COMMON: 252 return sizeof(entry->hdr->common); 253 case ACPI_SUBTABLE_HMAT: 254 return sizeof(entry->hdr->hmat); 255 case ACPI_SUBTABLE_PRMT: 256 return sizeof(entry->hdr->prmt); 257 } 258 return 0; 259 } 260 261 static enum acpi_subtable_type __init 262 acpi_get_subtable_type(char *id) 263 { 264 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0) 265 return ACPI_SUBTABLE_HMAT; 266 if (strncmp(id, ACPI_SIG_PRMT, 4) == 0) 267 return ACPI_SUBTABLE_PRMT; 268 return ACPI_SUBTABLE_COMMON; 269 } 270 271 /** 272 * acpi_parse_entries_array - for each proc_num find a suitable subtable 273 * 274 * @id: table id (for debugging purposes) 275 * @table_size: size of the root table 276 * @table_header: where does the table start? 277 * @proc: array of acpi_subtable_proc struct containing entry id 278 * and associated handler with it 279 * @proc_num: how big proc is? 280 * @max_entries: how many entries can we process? 281 * 282 * For each proc_num find a subtable with proc->id and run proc->handler 283 * on it. Assumption is that there's only single handler for particular 284 * entry id. 285 * 286 * The table_size is not the size of the complete ACPI table (the length 287 * field in the header struct), but only the size of the root table; i.e., 288 * the offset from the very first byte of the complete ACPI table, to the 289 * first byte of the very first subtable. 290 * 291 * On success returns sum of all matching entries for all proc handlers. 292 * Otherwise, -ENODEV or -EINVAL is returned. 293 */ 294 static int __init acpi_parse_entries_array(char *id, unsigned long table_size, 295 struct acpi_table_header *table_header, 296 struct acpi_subtable_proc *proc, int proc_num, 297 unsigned int max_entries) 298 { 299 struct acpi_subtable_entry entry; 300 unsigned long table_end, subtable_len, entry_len; 301 int count = 0; 302 int errs = 0; 303 int i; 304 305 table_end = (unsigned long)table_header + table_header->length; 306 307 /* Parse all entries looking for a match. */ 308 309 entry.type = acpi_get_subtable_type(id); 310 entry.hdr = (union acpi_subtable_headers *) 311 ((unsigned long)table_header + table_size); 312 subtable_len = acpi_get_subtable_header_length(&entry); 313 314 while (((unsigned long)entry.hdr) + subtable_len < table_end) { 315 if (max_entries && count >= max_entries) 316 break; 317 318 for (i = 0; i < proc_num; i++) { 319 if (acpi_get_entry_type(&entry) != proc[i].id) 320 continue; 321 if (!proc[i].handler || 322 (!errs && proc[i].handler(entry.hdr, table_end))) { 323 errs++; 324 continue; 325 } 326 327 proc[i].count++; 328 break; 329 } 330 if (i != proc_num) 331 count++; 332 333 /* 334 * If entry->length is 0, break from this loop to avoid 335 * infinite loop. 336 */ 337 entry_len = acpi_get_entry_length(&entry); 338 if (entry_len == 0) { 339 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); 340 return -EINVAL; 341 } 342 343 entry.hdr = (union acpi_subtable_headers *) 344 ((unsigned long)entry.hdr + entry_len); 345 } 346 347 if (max_entries && count > max_entries) { 348 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n", 349 id, proc->id, count); 350 } 351 352 return errs ? -EINVAL : count; 353 } 354 355 int __init acpi_table_parse_entries_array(char *id, 356 unsigned long table_size, 357 struct acpi_subtable_proc *proc, int proc_num, 358 unsigned int max_entries) 359 { 360 struct acpi_table_header *table_header = NULL; 361 int count; 362 u32 instance = 0; 363 364 if (acpi_disabled) 365 return -ENODEV; 366 367 if (!id) 368 return -EINVAL; 369 370 if (!table_size) 371 return -EINVAL; 372 373 if (!strncmp(id, ACPI_SIG_MADT, 4)) 374 instance = acpi_apic_instance; 375 376 acpi_get_table(id, instance, &table_header); 377 if (!table_header) { 378 pr_warn("%4.4s not present\n", id); 379 return -ENODEV; 380 } 381 382 count = acpi_parse_entries_array(id, table_size, table_header, 383 proc, proc_num, max_entries); 384 385 acpi_put_table(table_header); 386 return count; 387 } 388 389 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 table_sigs[][ACPI_NAMESEG_SIZE] __initconst = { 493 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, 494 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, 495 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, 496 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, 497 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, 498 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, 499 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, 500 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, 501 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, 502 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, 503 ACPI_SIG_NHLT }; 504 505 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 506 507 #define NR_ACPI_INITRD_TABLES 64 508 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; sig < ARRAY_SIZE(table_sigs); sig++) 551 if (!memcmp(table->signature, table_sigs[sig], 4)) 552 break; 553 554 if (sig >= ARRAY_SIZE(table_sigs)) { 555 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 556 cpio_path, file.name); 557 continue; 558 } 559 if (file.size != table->length) { 560 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 561 cpio_path, file.name); 562 continue; 563 } 564 if (acpi_table_checksum(file.data, table->length)) { 565 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 566 cpio_path, file.name); 567 continue; 568 } 569 570 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 571 table->signature, cpio_path, file.name, table->length); 572 573 all_tables_size += table->length; 574 acpi_initrd_files[table_nr].data = file.data; 575 acpi_initrd_files[table_nr].size = file.size; 576 table_nr++; 577 } 578 if (table_nr == 0) 579 return; 580 581 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) { 582 pr_notice("kernel is locked down, ignoring table override\n"); 583 return; 584 } 585 586 acpi_tables_addr = 587 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE, 588 0, ACPI_TABLE_UPGRADE_MAX_PHYS); 589 if (!acpi_tables_addr) { 590 WARN_ON(1); 591 return; 592 } 593 /* 594 * Only calling e820_add_reserve does not work and the 595 * tables are invalid (memory got used) later. 596 * memblock_reserve works as expected and the tables won't get modified. 597 * But it's not enough on X86 because ioremap will 598 * complain later (used by acpi_os_map_memory) that the pages 599 * that should get mapped are not marked "reserved". 600 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 601 * works fine. 602 */ 603 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 604 605 kmemleak_ignore_phys(acpi_tables_addr); 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_locate_initial_tables() 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_locate_initial_tables(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; 817 818 return 0; 819 } 820 821 void __init acpi_reserve_initial_tables(void) 822 { 823 int i; 824 825 for (i = 0; i < ACPI_MAX_TABLES; i++) { 826 struct acpi_table_desc *table_desc = &initial_tables[i]; 827 u64 start = table_desc->address; 828 u64 size = table_desc->length; 829 830 if (!start || !size) 831 break; 832 833 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n", 834 table_desc->signature.ascii, start, start + size - 1); 835 836 memblock_reserve(start, size); 837 } 838 } 839 840 void __init acpi_table_init_complete(void) 841 { 842 acpi_table_initrd_scan(); 843 check_multiple_madt(); 844 } 845 846 int __init acpi_table_init(void) 847 { 848 int ret; 849 850 ret = acpi_locate_initial_tables(); 851 if (ret) 852 return ret; 853 854 acpi_table_init_complete(); 855 856 return 0; 857 } 858 859 static int __init acpi_parse_apic_instance(char *str) 860 { 861 if (!str) 862 return -EINVAL; 863 864 if (kstrtoint(str, 0, &acpi_apic_instance)) 865 return -EINVAL; 866 867 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 868 869 return 0; 870 } 871 early_param("acpi_apic_instance", acpi_parse_apic_instance); 872 873 static int __init acpi_force_table_verification_setup(char *s) 874 { 875 acpi_verify_table_checksum = true; 876 877 return 0; 878 } 879 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 880 881 static int __init acpi_force_32bit_fadt_addr(char *s) 882 { 883 pr_info("Forcing 32 Bit FADT addresses\n"); 884 acpi_gbl_use32_bit_fadt_addresses = TRUE; 885 886 return 0; 887 } 888 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 889