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 <linux/acpi.h> 39 #include "internal.h" 40 41 #ifdef CONFIG_ACPI_CUSTOM_DSDT 42 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 43 #endif 44 45 #define ACPI_MAX_TABLES 128 46 47 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 48 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 49 50 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 51 52 static int acpi_apic_instance __initdata; 53 54 /* 55 * Disable table checksum verification for the early stage due to the size 56 * limitation of the current x86 early mapping implementation. 57 */ 58 static bool acpi_verify_table_checksum __initdata = false; 59 60 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 61 { 62 if (!header) 63 return; 64 65 switch (header->type) { 66 67 case ACPI_MADT_TYPE_LOCAL_APIC: 68 { 69 struct acpi_madt_local_apic *p = 70 (struct acpi_madt_local_apic *)header; 71 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 72 p->processor_id, p->id, 73 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 74 } 75 break; 76 77 case ACPI_MADT_TYPE_LOCAL_X2APIC: 78 { 79 struct acpi_madt_local_x2apic *p = 80 (struct acpi_madt_local_x2apic *)header; 81 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 82 p->local_apic_id, p->uid, 83 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 84 } 85 break; 86 87 case ACPI_MADT_TYPE_IO_APIC: 88 { 89 struct acpi_madt_io_apic *p = 90 (struct acpi_madt_io_apic *)header; 91 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 92 p->id, p->address, p->global_irq_base); 93 } 94 break; 95 96 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 97 { 98 struct acpi_madt_interrupt_override *p = 99 (struct acpi_madt_interrupt_override *)header; 100 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 101 p->bus, p->source_irq, p->global_irq, 102 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 103 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 104 if (p->inti_flags & 105 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 106 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 107 p->inti_flags & 108 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 109 } 110 break; 111 112 case ACPI_MADT_TYPE_NMI_SOURCE: 113 { 114 struct acpi_madt_nmi_source *p = 115 (struct acpi_madt_nmi_source *)header; 116 pr_info("NMI_SRC (%s %s global_irq %d)\n", 117 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 118 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 119 p->global_irq); 120 } 121 break; 122 123 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 124 { 125 struct acpi_madt_local_apic_nmi *p = 126 (struct acpi_madt_local_apic_nmi *)header; 127 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 128 p->processor_id, 129 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 130 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 131 p->lint); 132 } 133 break; 134 135 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 136 { 137 u16 polarity, trigger; 138 struct acpi_madt_local_x2apic_nmi *p = 139 (struct acpi_madt_local_x2apic_nmi *)header; 140 141 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 142 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 143 144 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 145 p->uid, 146 mps_inti_flags_polarity[polarity], 147 mps_inti_flags_trigger[trigger], 148 p->lint); 149 } 150 break; 151 152 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 153 { 154 struct acpi_madt_local_apic_override *p = 155 (struct acpi_madt_local_apic_override *)header; 156 pr_info("LAPIC_ADDR_OVR (address[%p])\n", 157 (void *)(unsigned long)p->address); 158 } 159 break; 160 161 case ACPI_MADT_TYPE_IO_SAPIC: 162 { 163 struct acpi_madt_io_sapic *p = 164 (struct acpi_madt_io_sapic *)header; 165 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 166 p->id, (void *)(unsigned long)p->address, 167 p->global_irq_base); 168 } 169 break; 170 171 case ACPI_MADT_TYPE_LOCAL_SAPIC: 172 { 173 struct acpi_madt_local_sapic *p = 174 (struct acpi_madt_local_sapic *)header; 175 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 176 p->processor_id, p->id, p->eid, 177 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 178 } 179 break; 180 181 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 182 { 183 struct acpi_madt_interrupt_source *p = 184 (struct acpi_madt_interrupt_source *)header; 185 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", 186 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 187 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 188 p->type, p->id, p->eid, p->io_sapic_vector, 189 p->global_irq); 190 } 191 break; 192 193 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 194 { 195 struct acpi_madt_generic_interrupt *p = 196 (struct acpi_madt_generic_interrupt *)header; 197 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 198 p->uid, p->base_address, 199 p->arm_mpidr, 200 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 201 202 } 203 break; 204 205 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 206 { 207 struct acpi_madt_generic_distributor *p = 208 (struct acpi_madt_generic_distributor *)header; 209 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 210 p->gic_id, p->base_address, 211 p->global_irq_base); 212 } 213 break; 214 215 default: 216 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 217 header->type); 218 break; 219 } 220 } 221 222 /** 223 * acpi_parse_entries_array - for each proc_num find a suitable subtable 224 * 225 * @id: table id (for debugging purposes) 226 * @table_size: single entry size 227 * @table_header: where does the table start? 228 * @proc: array of acpi_subtable_proc struct containing entry id 229 * and associated handler with it 230 * @proc_num: how big proc is? 231 * @max_entries: how many entries can we process? 232 * 233 * For each proc_num find a subtable with proc->id and run proc->handler 234 * on it. Assumption is that there's only single handler for particular 235 * entry id. 236 * 237 * On success returns sum of all matching entries for all proc handlers. 238 * Otherwise, -ENODEV or -EINVAL is returned. 239 */ 240 static int __init 241 acpi_parse_entries_array(char *id, unsigned long table_size, 242 struct acpi_table_header *table_header, 243 struct acpi_subtable_proc *proc, int proc_num, 244 unsigned int max_entries) 245 { 246 struct acpi_subtable_header *entry; 247 unsigned long table_end; 248 int count = 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 proc[i].handler(entry, table_end)) 282 return -EINVAL; 283 284 proc->count++; 285 break; 286 } 287 if (i != proc_num) 288 count++; 289 290 /* 291 * If entry->length is 0, break from this loop to avoid 292 * infinite loop. 293 */ 294 if (entry->length == 0) { 295 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); 296 return -EINVAL; 297 } 298 299 entry = (struct acpi_subtable_header *) 300 ((unsigned long)entry + entry->length); 301 } 302 303 if (max_entries && count > max_entries) { 304 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n", 305 id, proc->id, count - max_entries, count); 306 } 307 308 return count; 309 } 310 311 int __init 312 acpi_parse_entries(char *id, 313 unsigned long table_size, 314 acpi_tbl_entry_handler handler, 315 struct acpi_table_header *table_header, 316 int entry_id, unsigned int max_entries) 317 { 318 struct acpi_subtable_proc proc = { 319 .id = entry_id, 320 .handler = handler, 321 }; 322 323 return acpi_parse_entries_array(id, table_size, table_header, 324 &proc, 1, max_entries); 325 } 326 327 int __init 328 acpi_table_parse_entries_array(char *id, 329 unsigned long table_size, 330 struct acpi_subtable_proc *proc, int proc_num, 331 unsigned int max_entries) 332 { 333 struct acpi_table_header *table_header = NULL; 334 acpi_size tbl_size; 335 int count; 336 u32 instance = 0; 337 338 if (acpi_disabled) 339 return -ENODEV; 340 341 if (!id) 342 return -EINVAL; 343 344 if (!strncmp(id, ACPI_SIG_MADT, 4)) 345 instance = acpi_apic_instance; 346 347 acpi_get_table_with_size(id, instance, &table_header, &tbl_size); 348 if (!table_header) { 349 pr_warn("%4.4s not present\n", id); 350 return -ENODEV; 351 } 352 353 count = acpi_parse_entries_array(id, table_size, table_header, 354 proc, proc_num, max_entries); 355 356 early_acpi_os_unmap_memory((char *)table_header, tbl_size); 357 return count; 358 } 359 360 int __init 361 acpi_table_parse_entries(char *id, 362 unsigned long table_size, 363 int entry_id, 364 acpi_tbl_entry_handler handler, 365 unsigned int max_entries) 366 { 367 struct acpi_subtable_proc proc = { 368 .id = entry_id, 369 .handler = handler, 370 }; 371 372 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 373 max_entries); 374 } 375 376 int __init 377 acpi_table_parse_madt(enum acpi_madt_type id, 378 acpi_tbl_entry_handler handler, unsigned int max_entries) 379 { 380 return acpi_table_parse_entries(ACPI_SIG_MADT, 381 sizeof(struct acpi_table_madt), id, 382 handler, max_entries); 383 } 384 385 /** 386 * acpi_table_parse - find table with @id, run @handler on it 387 * @id: table id to find 388 * @handler: handler to run 389 * 390 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 391 * run @handler on it. 392 * 393 * Return 0 if table found, -errno if not. 394 */ 395 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 396 { 397 struct acpi_table_header *table = NULL; 398 acpi_size tbl_size; 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_with_size(id, acpi_apic_instance, &table, &tbl_size); 408 else 409 acpi_get_table_with_size(id, 0, &table, &tbl_size); 410 411 if (table) { 412 handler(table); 413 early_acpi_os_unmap_memory(table, tbl_size); 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 acpi_size tbl_size; 428 429 acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size); 430 if (table) { 431 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 432 acpi_apic_instance); 433 pr_warn("If \"acpi_apic_instance=%d\" works better, " 434 "notify linux-acpi@vger.kernel.org\n", 435 acpi_apic_instance ? 0 : 2); 436 early_acpi_os_unmap_memory(table, tbl_size); 437 438 } else 439 acpi_apic_instance = 0; 440 441 return; 442 } 443 444 static void acpi_table_taint(struct acpi_table_header *table) 445 { 446 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 447 table->signature, table->oem_table_id); 448 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 449 } 450 451 #ifdef CONFIG_ACPI_TABLE_UPGRADE 452 static u64 acpi_tables_addr; 453 static int all_tables_size; 454 455 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 456 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 457 { 458 u8 sum = 0; 459 u8 *end = buffer + length; 460 461 while (buffer < end) 462 sum = (u8) (sum + *(buffer++)); 463 return sum; 464 } 465 466 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 467 static const char * const table_sigs[] = { 468 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 469 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 470 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 471 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 472 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 473 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 474 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 475 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 476 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 477 478 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 479 480 #define NR_ACPI_INITRD_TABLES 64 481 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 482 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 483 484 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 485 486 void __init acpi_table_upgrade(void) 487 { 488 void *data = (void *)initrd_start; 489 size_t size = initrd_end - initrd_start; 490 int sig, no, table_nr = 0, total_offset = 0; 491 long offset = 0; 492 struct acpi_table_header *table; 493 char cpio_path[32] = "kernel/firmware/acpi/"; 494 struct cpio_data file; 495 496 if (data == NULL || size == 0) 497 return; 498 499 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 500 file = find_cpio_data(cpio_path, data, size, &offset); 501 if (!file.data) 502 break; 503 504 data += offset; 505 size -= offset; 506 507 if (file.size < sizeof(struct acpi_table_header)) { 508 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 509 cpio_path, file.name); 510 continue; 511 } 512 513 table = file.data; 514 515 for (sig = 0; table_sigs[sig]; sig++) 516 if (!memcmp(table->signature, table_sigs[sig], 4)) 517 break; 518 519 if (!table_sigs[sig]) { 520 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 521 cpio_path, file.name); 522 continue; 523 } 524 if (file.size != table->length) { 525 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 526 cpio_path, file.name); 527 continue; 528 } 529 if (acpi_table_checksum(file.data, table->length)) { 530 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 531 cpio_path, file.name); 532 continue; 533 } 534 535 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 536 table->signature, cpio_path, file.name, table->length); 537 538 all_tables_size += table->length; 539 acpi_initrd_files[table_nr].data = file.data; 540 acpi_initrd_files[table_nr].size = file.size; 541 table_nr++; 542 } 543 if (table_nr == 0) 544 return; 545 546 acpi_tables_addr = 547 memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, 548 all_tables_size, PAGE_SIZE); 549 if (!acpi_tables_addr) { 550 WARN_ON(1); 551 return; 552 } 553 /* 554 * Only calling e820_add_reserve does not work and the 555 * tables are invalid (memory got used) later. 556 * memblock_reserve works as expected and the tables won't get modified. 557 * But it's not enough on X86 because ioremap will 558 * complain later (used by acpi_os_map_memory) that the pages 559 * that should get mapped are not marked "reserved". 560 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 561 * works fine. 562 */ 563 memblock_reserve(acpi_tables_addr, all_tables_size); 564 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 565 566 /* 567 * early_ioremap only can remap 256k one time. If we map all 568 * tables one time, we will hit the limit. Need to map chunks 569 * one by one during copying the same as that in relocate_initrd(). 570 */ 571 for (no = 0; no < table_nr; no++) { 572 unsigned char *src_p = acpi_initrd_files[no].data; 573 phys_addr_t size = acpi_initrd_files[no].size; 574 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 575 phys_addr_t slop, clen; 576 char *dest_p; 577 578 total_offset += size; 579 580 while (size) { 581 slop = dest_addr & ~PAGE_MASK; 582 clen = size; 583 if (clen > MAP_CHUNK_SIZE - slop) 584 clen = MAP_CHUNK_SIZE - slop; 585 dest_p = early_memremap(dest_addr & PAGE_MASK, 586 clen + slop); 587 memcpy(dest_p + slop, src_p, clen); 588 early_memunmap(dest_p, clen + slop); 589 src_p += clen; 590 dest_addr += clen; 591 size -= clen; 592 } 593 } 594 } 595 596 static acpi_status 597 acpi_table_initrd_override(struct acpi_table_header *existing_table, 598 acpi_physical_address *address, u32 *length) 599 { 600 int table_offset = 0; 601 int table_index = 0; 602 struct acpi_table_header *table; 603 u32 table_length; 604 605 *length = 0; 606 *address = 0; 607 if (!acpi_tables_addr) 608 return AE_OK; 609 610 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 611 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 612 ACPI_HEADER_SIZE); 613 if (table_offset + table->length > all_tables_size) { 614 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 615 WARN_ON(1); 616 return AE_OK; 617 } 618 619 table_length = table->length; 620 621 /* Only override tables matched */ 622 if (memcmp(existing_table->signature, table->signature, 4) || 623 memcmp(table->oem_id, existing_table->oem_id, 624 ACPI_OEM_ID_SIZE) || 625 memcmp(table->oem_table_id, existing_table->oem_table_id, 626 ACPI_OEM_TABLE_ID_SIZE)) { 627 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 628 goto next_table; 629 } 630 /* 631 * Mark the table to avoid being used in 632 * acpi_table_initrd_scan() and check the revision. 633 */ 634 if (test_and_set_bit(table_index, acpi_initrd_installed) || 635 existing_table->oem_revision >= table->oem_revision) { 636 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 637 goto next_table; 638 } 639 640 *length = table_length; 641 *address = acpi_tables_addr + table_offset; 642 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 643 table->signature, table->oem_id, 644 table->oem_table_id); 645 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 646 break; 647 648 next_table: 649 table_offset += table_length; 650 table_index++; 651 } 652 return AE_OK; 653 } 654 655 static void __init acpi_table_initrd_scan(void) 656 { 657 int table_offset = 0; 658 int table_index = 0; 659 u32 table_length; 660 struct acpi_table_header *table; 661 662 if (!acpi_tables_addr) 663 return; 664 665 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 666 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 667 ACPI_HEADER_SIZE); 668 if (table_offset + table->length > all_tables_size) { 669 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 670 WARN_ON(1); 671 return; 672 } 673 674 table_length = table->length; 675 676 /* Skip RSDT/XSDT which should only be used for override */ 677 if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) || 678 ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) { 679 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 680 goto next_table; 681 } 682 /* 683 * Mark the table to avoid being used in 684 * acpi_table_initrd_override(). Though this is not possible 685 * because override is disabled in acpi_install_table(). 686 */ 687 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 688 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 689 goto next_table; 690 } 691 692 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 693 table->signature, table->oem_id, 694 table->oem_table_id); 695 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 696 acpi_install_table(acpi_tables_addr + table_offset, TRUE); 697 next_table: 698 table_offset += table_length; 699 table_index++; 700 } 701 } 702 #else 703 static acpi_status 704 acpi_table_initrd_override(struct acpi_table_header *existing_table, 705 acpi_physical_address *address, 706 u32 *table_length) 707 { 708 *table_length = 0; 709 *address = 0; 710 return AE_OK; 711 } 712 713 static void __init acpi_table_initrd_scan(void) 714 { 715 } 716 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 717 718 acpi_status 719 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 720 acpi_physical_address *address, 721 u32 *table_length) 722 { 723 return acpi_table_initrd_override(existing_table, address, 724 table_length); 725 } 726 727 acpi_status 728 acpi_os_table_override(struct acpi_table_header *existing_table, 729 struct acpi_table_header **new_table) 730 { 731 if (!existing_table || !new_table) 732 return AE_BAD_PARAMETER; 733 734 *new_table = NULL; 735 736 #ifdef CONFIG_ACPI_CUSTOM_DSDT 737 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 738 *new_table = (struct acpi_table_header *)AmlCode; 739 #endif 740 if (*new_table != NULL) 741 acpi_table_taint(existing_table); 742 return AE_OK; 743 } 744 745 /* 746 * acpi_table_init() 747 * 748 * find RSDP, find and checksum SDT/XSDT. 749 * checksum all tables, print SDT/XSDT 750 * 751 * result: sdt_entry[] is initialized 752 */ 753 754 int __init acpi_table_init(void) 755 { 756 acpi_status status; 757 758 if (acpi_verify_table_checksum) { 759 pr_info("Early table checksum verification enabled\n"); 760 acpi_gbl_verify_table_checksum = TRUE; 761 } else { 762 pr_info("Early table checksum verification disabled\n"); 763 acpi_gbl_verify_table_checksum = FALSE; 764 } 765 766 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 767 if (ACPI_FAILURE(status)) 768 return -EINVAL; 769 acpi_table_initrd_scan(); 770 771 check_multiple_madt(); 772 return 0; 773 } 774 775 static int __init acpi_parse_apic_instance(char *str) 776 { 777 if (!str) 778 return -EINVAL; 779 780 if (kstrtoint(str, 0, &acpi_apic_instance)) 781 return -EINVAL; 782 783 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 784 785 return 0; 786 } 787 788 early_param("acpi_apic_instance", acpi_parse_apic_instance); 789 790 static int __init acpi_force_table_verification_setup(char *s) 791 { 792 acpi_verify_table_checksum = true; 793 794 return 0; 795 } 796 797 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 798 799 static int __init acpi_force_32bit_fadt_addr(char *s) 800 { 801 pr_info("Forcing 32 Bit FADT addresses\n"); 802 acpi_gbl_use32_bit_fadt_addresses = TRUE; 803 804 return 0; 805 } 806 807 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 808