1 /* 2 * acpi_tables.c - ACPI Boot-Time Table Parsing 3 * 4 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * 6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 19 * 20 */ 21 22 /* Uncomment next line to get verbose printout */ 23 /* #define DEBUG */ 24 #define pr_fmt(fmt) "ACPI: " fmt 25 26 #include <linux/init.h> 27 #include <linux/kernel.h> 28 #include <linux/smp.h> 29 #include <linux/string.h> 30 #include <linux/types.h> 31 #include <linux/irq.h> 32 #include <linux/errno.h> 33 #include <linux/acpi.h> 34 #include <linux/bootmem.h> 35 #include <linux/earlycpio.h> 36 #include <linux/memblock.h> 37 #include <linux/initrd.h> 38 #include "internal.h" 39 40 #ifdef CONFIG_ACPI_CUSTOM_DSDT 41 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 42 #endif 43 44 #define ACPI_MAX_TABLES 128 45 46 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 47 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 48 49 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 50 51 static int acpi_apic_instance __initdata; 52 53 /* 54 * Disable table checksum verification for the early stage due to the size 55 * limitation of the current x86 early mapping implementation. 56 */ 57 static bool acpi_verify_table_checksum __initdata = false; 58 59 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 60 { 61 if (!header) 62 return; 63 64 switch (header->type) { 65 66 case ACPI_MADT_TYPE_LOCAL_APIC: 67 { 68 struct acpi_madt_local_apic *p = 69 (struct acpi_madt_local_apic *)header; 70 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 71 p->processor_id, p->id, 72 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 73 } 74 break; 75 76 case ACPI_MADT_TYPE_LOCAL_X2APIC: 77 { 78 struct acpi_madt_local_x2apic *p = 79 (struct acpi_madt_local_x2apic *)header; 80 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 81 p->local_apic_id, p->uid, 82 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 83 } 84 break; 85 86 case ACPI_MADT_TYPE_IO_APIC: 87 { 88 struct acpi_madt_io_apic *p = 89 (struct acpi_madt_io_apic *)header; 90 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 91 p->id, p->address, p->global_irq_base); 92 } 93 break; 94 95 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 96 { 97 struct acpi_madt_interrupt_override *p = 98 (struct acpi_madt_interrupt_override *)header; 99 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 100 p->bus, p->source_irq, p->global_irq, 101 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 102 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 103 if (p->inti_flags & 104 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 105 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 106 p->inti_flags & 107 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 108 } 109 break; 110 111 case ACPI_MADT_TYPE_NMI_SOURCE: 112 { 113 struct acpi_madt_nmi_source *p = 114 (struct acpi_madt_nmi_source *)header; 115 pr_info("NMI_SRC (%s %s global_irq %d)\n", 116 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 117 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 118 p->global_irq); 119 } 120 break; 121 122 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 123 { 124 struct acpi_madt_local_apic_nmi *p = 125 (struct acpi_madt_local_apic_nmi *)header; 126 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 127 p->processor_id, 128 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 129 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 130 p->lint); 131 } 132 break; 133 134 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 135 { 136 u16 polarity, trigger; 137 struct acpi_madt_local_x2apic_nmi *p = 138 (struct acpi_madt_local_x2apic_nmi *)header; 139 140 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 141 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 142 143 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 144 p->uid, 145 mps_inti_flags_polarity[polarity], 146 mps_inti_flags_trigger[trigger], 147 p->lint); 148 } 149 break; 150 151 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 152 { 153 struct acpi_madt_local_apic_override *p = 154 (struct acpi_madt_local_apic_override *)header; 155 pr_info("LAPIC_ADDR_OVR (address[%p])\n", 156 (void *)(unsigned long)p->address); 157 } 158 break; 159 160 case ACPI_MADT_TYPE_IO_SAPIC: 161 { 162 struct acpi_madt_io_sapic *p = 163 (struct acpi_madt_io_sapic *)header; 164 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 165 p->id, (void *)(unsigned long)p->address, 166 p->global_irq_base); 167 } 168 break; 169 170 case ACPI_MADT_TYPE_LOCAL_SAPIC: 171 { 172 struct acpi_madt_local_sapic *p = 173 (struct acpi_madt_local_sapic *)header; 174 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 175 p->processor_id, p->id, p->eid, 176 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 177 } 178 break; 179 180 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 181 { 182 struct acpi_madt_interrupt_source *p = 183 (struct acpi_madt_interrupt_source *)header; 184 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", 185 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 186 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 187 p->type, p->id, p->eid, p->io_sapic_vector, 188 p->global_irq); 189 } 190 break; 191 192 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 193 { 194 struct acpi_madt_generic_interrupt *p = 195 (struct acpi_madt_generic_interrupt *)header; 196 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 197 p->uid, p->base_address, 198 p->arm_mpidr, 199 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 200 201 } 202 break; 203 204 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 205 { 206 struct acpi_madt_generic_distributor *p = 207 (struct acpi_madt_generic_distributor *)header; 208 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 209 p->gic_id, p->base_address, 210 p->global_irq_base); 211 } 212 break; 213 214 default: 215 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 216 header->type); 217 break; 218 } 219 } 220 221 /** 222 * acpi_parse_entries_array - for each proc_num find a suitable subtable 223 * 224 * @id: table id (for debugging purposes) 225 * @table_size: single entry size 226 * @table_header: where does the table start? 227 * @proc: array of acpi_subtable_proc struct containing entry id 228 * and associated handler with it 229 * @proc_num: how big proc is? 230 * @max_entries: how many entries can we process? 231 * 232 * For each proc_num find a subtable with proc->id and run proc->handler 233 * on it. Assumption is that there's only single handler for particular 234 * entry id. 235 * 236 * On success returns sum of all matching entries for all proc handlers. 237 * Otherwise, -ENODEV or -EINVAL is returned. 238 */ 239 static int __init 240 acpi_parse_entries_array(char *id, unsigned long table_size, 241 struct acpi_table_header *table_header, 242 struct acpi_subtable_proc *proc, int proc_num, 243 unsigned int max_entries) 244 { 245 struct acpi_subtable_header *entry; 246 unsigned long table_end; 247 int count = 0; 248 int errs = 0; 249 int i; 250 251 if (acpi_disabled) 252 return -ENODEV; 253 254 if (!id) 255 return -EINVAL; 256 257 if (!table_size) 258 return -EINVAL; 259 260 if (!table_header) { 261 pr_warn("%4.4s not present\n", id); 262 return -ENODEV; 263 } 264 265 table_end = (unsigned long)table_header + table_header->length; 266 267 /* Parse all entries looking for a match. */ 268 269 entry = (struct acpi_subtable_header *) 270 ((unsigned long)table_header + table_size); 271 272 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < 273 table_end) { 274 if (max_entries && count >= max_entries) 275 break; 276 277 for (i = 0; i < proc_num; i++) { 278 if (entry->type != proc[i].id) 279 continue; 280 if (!proc[i].handler || 281 (!errs && proc[i].handler(entry, table_end))) { 282 errs++; 283 continue; 284 } 285 286 proc[i].count++; 287 break; 288 } 289 if (i != proc_num) 290 count++; 291 292 /* 293 * If entry->length is 0, break from this loop to avoid 294 * infinite loop. 295 */ 296 if (entry->length == 0) { 297 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); 298 return -EINVAL; 299 } 300 301 entry = (struct acpi_subtable_header *) 302 ((unsigned long)entry + entry->length); 303 } 304 305 if (max_entries && count > max_entries) { 306 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n", 307 id, proc->id, count); 308 } 309 310 return errs ? -EINVAL : count; 311 } 312 313 int __init 314 acpi_parse_entries(char *id, 315 unsigned long table_size, 316 acpi_tbl_entry_handler handler, 317 struct acpi_table_header *table_header, 318 int entry_id, unsigned int max_entries) 319 { 320 struct acpi_subtable_proc proc = { 321 .id = entry_id, 322 .handler = handler, 323 }; 324 325 return acpi_parse_entries_array(id, table_size, table_header, 326 &proc, 1, max_entries); 327 } 328 329 int __init 330 acpi_table_parse_entries_array(char *id, 331 unsigned long table_size, 332 struct acpi_subtable_proc *proc, int proc_num, 333 unsigned int max_entries) 334 { 335 struct acpi_table_header *table_header = NULL; 336 int count; 337 u32 instance = 0; 338 339 if (acpi_disabled) 340 return -ENODEV; 341 342 if (!id) 343 return -EINVAL; 344 345 if (!strncmp(id, ACPI_SIG_MADT, 4)) 346 instance = acpi_apic_instance; 347 348 acpi_get_table(id, instance, &table_header); 349 if (!table_header) { 350 pr_warn("%4.4s not present\n", id); 351 return -ENODEV; 352 } 353 354 count = acpi_parse_entries_array(id, table_size, table_header, 355 proc, proc_num, max_entries); 356 357 acpi_put_table(table_header); 358 return count; 359 } 360 361 int __init 362 acpi_table_parse_entries(char *id, 363 unsigned long table_size, 364 int entry_id, 365 acpi_tbl_entry_handler handler, 366 unsigned int max_entries) 367 { 368 struct acpi_subtable_proc proc = { 369 .id = entry_id, 370 .handler = handler, 371 }; 372 373 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 374 max_entries); 375 } 376 377 int __init 378 acpi_table_parse_madt(enum acpi_madt_type id, 379 acpi_tbl_entry_handler handler, unsigned int max_entries) 380 { 381 return acpi_table_parse_entries(ACPI_SIG_MADT, 382 sizeof(struct acpi_table_madt), id, 383 handler, max_entries); 384 } 385 386 /** 387 * acpi_table_parse - find table with @id, run @handler on it 388 * @id: table id to find 389 * @handler: handler to run 390 * 391 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 392 * run @handler on it. 393 * 394 * Return 0 if table found, -errno if not. 395 */ 396 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 397 { 398 struct acpi_table_header *table = NULL; 399 400 if (acpi_disabled) 401 return -ENODEV; 402 403 if (!id || !handler) 404 return -EINVAL; 405 406 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 407 acpi_get_table(id, acpi_apic_instance, &table); 408 else 409 acpi_get_table(id, 0, &table); 410 411 if (table) { 412 handler(table); 413 acpi_put_table(table); 414 return 0; 415 } else 416 return -ENODEV; 417 } 418 419 /* 420 * The BIOS is supposed to supply a single APIC/MADT, 421 * but some report two. Provide a knob to use either. 422 * (don't you wish instance 0 and 1 were not the same?) 423 */ 424 static void __init check_multiple_madt(void) 425 { 426 struct acpi_table_header *table = NULL; 427 428 acpi_get_table(ACPI_SIG_MADT, 2, &table); 429 if (table) { 430 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 431 acpi_apic_instance); 432 pr_warn("If \"acpi_apic_instance=%d\" works better, " 433 "notify linux-acpi@vger.kernel.org\n", 434 acpi_apic_instance ? 0 : 2); 435 acpi_put_table(table); 436 437 } else 438 acpi_apic_instance = 0; 439 440 return; 441 } 442 443 static void acpi_table_taint(struct acpi_table_header *table) 444 { 445 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 446 table->signature, table->oem_table_id); 447 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 448 } 449 450 #ifdef CONFIG_ACPI_TABLE_UPGRADE 451 static u64 acpi_tables_addr; 452 static int all_tables_size; 453 454 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 455 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 456 { 457 u8 sum = 0; 458 u8 *end = buffer + length; 459 460 while (buffer < end) 461 sum = (u8) (sum + *(buffer++)); 462 return sum; 463 } 464 465 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 466 static const char * const table_sigs[] = { 467 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 468 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 469 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 470 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 471 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 472 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 473 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 474 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 475 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 476 477 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 478 479 #define NR_ACPI_INITRD_TABLES 64 480 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 481 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 482 483 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 484 485 void __init acpi_table_upgrade(void) 486 { 487 void *data = (void *)initrd_start; 488 size_t size = initrd_end - initrd_start; 489 int sig, no, table_nr = 0, total_offset = 0; 490 long offset = 0; 491 struct acpi_table_header *table; 492 char cpio_path[32] = "kernel/firmware/acpi/"; 493 struct cpio_data file; 494 495 if (data == NULL || size == 0) 496 return; 497 498 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 499 file = find_cpio_data(cpio_path, data, size, &offset); 500 if (!file.data) 501 break; 502 503 data += offset; 504 size -= offset; 505 506 if (file.size < sizeof(struct acpi_table_header)) { 507 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 508 cpio_path, file.name); 509 continue; 510 } 511 512 table = file.data; 513 514 for (sig = 0; table_sigs[sig]; sig++) 515 if (!memcmp(table->signature, table_sigs[sig], 4)) 516 break; 517 518 if (!table_sigs[sig]) { 519 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 520 cpio_path, file.name); 521 continue; 522 } 523 if (file.size != table->length) { 524 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 525 cpio_path, file.name); 526 continue; 527 } 528 if (acpi_table_checksum(file.data, table->length)) { 529 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 530 cpio_path, file.name); 531 continue; 532 } 533 534 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 535 table->signature, cpio_path, file.name, table->length); 536 537 all_tables_size += table->length; 538 acpi_initrd_files[table_nr].data = file.data; 539 acpi_initrd_files[table_nr].size = file.size; 540 table_nr++; 541 } 542 if (table_nr == 0) 543 return; 544 545 acpi_tables_addr = 546 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, 547 all_tables_size, PAGE_SIZE); 548 if (!acpi_tables_addr) { 549 WARN_ON(1); 550 return; 551 } 552 /* 553 * Only calling e820_add_reserve does not work and the 554 * tables are invalid (memory got used) later. 555 * memblock_reserve works as expected and the tables won't get modified. 556 * But it's not enough on X86 because ioremap will 557 * complain later (used by acpi_os_map_memory) that the pages 558 * that should get mapped are not marked "reserved". 559 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 560 * works fine. 561 */ 562 memblock_reserve(acpi_tables_addr, all_tables_size); 563 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 564 565 /* 566 * early_ioremap only can remap 256k one time. If we map all 567 * tables one time, we will hit the limit. Need to map chunks 568 * one by one during copying the same as that in relocate_initrd(). 569 */ 570 for (no = 0; no < table_nr; no++) { 571 unsigned char *src_p = acpi_initrd_files[no].data; 572 phys_addr_t size = acpi_initrd_files[no].size; 573 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 574 phys_addr_t slop, clen; 575 char *dest_p; 576 577 total_offset += size; 578 579 while (size) { 580 slop = dest_addr & ~PAGE_MASK; 581 clen = size; 582 if (clen > MAP_CHUNK_SIZE - slop) 583 clen = MAP_CHUNK_SIZE - slop; 584 dest_p = early_memremap(dest_addr & PAGE_MASK, 585 clen + slop); 586 memcpy(dest_p + slop, src_p, clen); 587 early_memunmap(dest_p, clen + slop); 588 src_p += clen; 589 dest_addr += clen; 590 size -= clen; 591 } 592 } 593 } 594 595 static acpi_status 596 acpi_table_initrd_override(struct acpi_table_header *existing_table, 597 acpi_physical_address *address, u32 *length) 598 { 599 int table_offset = 0; 600 int table_index = 0; 601 struct acpi_table_header *table; 602 u32 table_length; 603 604 *length = 0; 605 *address = 0; 606 if (!acpi_tables_addr) 607 return AE_OK; 608 609 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 610 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 611 ACPI_HEADER_SIZE); 612 if (table_offset + table->length > all_tables_size) { 613 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 614 WARN_ON(1); 615 return AE_OK; 616 } 617 618 table_length = table->length; 619 620 /* Only override tables matched */ 621 if (memcmp(existing_table->signature, table->signature, 4) || 622 memcmp(table->oem_id, existing_table->oem_id, 623 ACPI_OEM_ID_SIZE) || 624 memcmp(table->oem_table_id, existing_table->oem_table_id, 625 ACPI_OEM_TABLE_ID_SIZE)) { 626 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 627 goto next_table; 628 } 629 /* 630 * Mark the table to avoid being used in 631 * acpi_table_initrd_scan() and check the revision. 632 */ 633 if (test_and_set_bit(table_index, acpi_initrd_installed) || 634 existing_table->oem_revision >= table->oem_revision) { 635 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 636 goto next_table; 637 } 638 639 *length = table_length; 640 *address = acpi_tables_addr + table_offset; 641 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 642 table->signature, table->oem_id, 643 table->oem_table_id); 644 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 645 break; 646 647 next_table: 648 table_offset += table_length; 649 table_index++; 650 } 651 return AE_OK; 652 } 653 654 static void __init acpi_table_initrd_scan(void) 655 { 656 int table_offset = 0; 657 int table_index = 0; 658 u32 table_length; 659 struct acpi_table_header *table; 660 661 if (!acpi_tables_addr) 662 return; 663 664 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 665 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 666 ACPI_HEADER_SIZE); 667 if (table_offset + table->length > all_tables_size) { 668 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 669 WARN_ON(1); 670 return; 671 } 672 673 table_length = table->length; 674 675 /* Skip RSDT/XSDT which should only be used for override */ 676 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) || 677 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) { 678 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 679 goto next_table; 680 } 681 /* 682 * Mark the table to avoid being used in 683 * acpi_table_initrd_override(). Though this is not possible 684 * because override is disabled in acpi_install_table(). 685 */ 686 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 687 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 688 goto next_table; 689 } 690 691 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 692 table->signature, table->oem_id, 693 table->oem_table_id); 694 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 695 acpi_install_table(acpi_tables_addr + table_offset, TRUE); 696 next_table: 697 table_offset += table_length; 698 table_index++; 699 } 700 } 701 #else 702 static acpi_status 703 acpi_table_initrd_override(struct acpi_table_header *existing_table, 704 acpi_physical_address *address, 705 u32 *table_length) 706 { 707 *table_length = 0; 708 *address = 0; 709 return AE_OK; 710 } 711 712 static void __init acpi_table_initrd_scan(void) 713 { 714 } 715 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 716 717 acpi_status 718 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 719 acpi_physical_address *address, 720 u32 *table_length) 721 { 722 return acpi_table_initrd_override(existing_table, address, 723 table_length); 724 } 725 726 acpi_status 727 acpi_os_table_override(struct acpi_table_header *existing_table, 728 struct acpi_table_header **new_table) 729 { 730 if (!existing_table || !new_table) 731 return AE_BAD_PARAMETER; 732 733 *new_table = NULL; 734 735 #ifdef CONFIG_ACPI_CUSTOM_DSDT 736 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 737 *new_table = (struct acpi_table_header *)AmlCode; 738 #endif 739 if (*new_table != NULL) 740 acpi_table_taint(existing_table); 741 return AE_OK; 742 } 743 744 /* 745 * acpi_table_init() 746 * 747 * find RSDP, find and checksum SDT/XSDT. 748 * checksum all tables, print SDT/XSDT 749 * 750 * result: sdt_entry[] is initialized 751 */ 752 753 int __init acpi_table_init(void) 754 { 755 acpi_status status; 756 757 if (acpi_verify_table_checksum) { 758 pr_info("Early table checksum verification enabled\n"); 759 acpi_gbl_verify_table_checksum = TRUE; 760 } else { 761 pr_info("Early table checksum verification disabled\n"); 762 acpi_gbl_verify_table_checksum = FALSE; 763 } 764 765 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 766 if (ACPI_FAILURE(status)) 767 return -EINVAL; 768 acpi_table_initrd_scan(); 769 770 check_multiple_madt(); 771 return 0; 772 } 773 774 static int __init acpi_parse_apic_instance(char *str) 775 { 776 if (!str) 777 return -EINVAL; 778 779 if (kstrtoint(str, 0, &acpi_apic_instance)) 780 return -EINVAL; 781 782 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 783 784 return 0; 785 } 786 787 early_param("acpi_apic_instance", acpi_parse_apic_instance); 788 789 static int __init acpi_force_table_verification_setup(char *s) 790 { 791 acpi_verify_table_checksum = true; 792 793 return 0; 794 } 795 796 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 797 798 static int __init acpi_force_32bit_fadt_addr(char *s) 799 { 800 pr_info("Forcing 32 Bit FADT addresses\n"); 801 acpi_gbl_use32_bit_fadt_addresses = TRUE; 802 803 return 0; 804 } 805 806 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 807