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_or_acpilib; 39 40 /* 41 * Disable table checksum verification for the early stage due to the size 42 * limitation of the current x86 early mapping implementation. 43 */ 44 static bool acpi_verify_table_checksum __initdata_or_acpilib = false; 45 acpi_table_print_madt_entry(struct acpi_subtable_header * header)46 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 47 { 48 if (!header) 49 return; 50 51 switch (header->type) { 52 53 case ACPI_MADT_TYPE_LOCAL_APIC: 54 { 55 struct acpi_madt_local_apic *p = 56 (struct acpi_madt_local_apic *)header; 57 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 58 p->processor_id, p->id, 59 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 60 } 61 break; 62 63 case ACPI_MADT_TYPE_LOCAL_X2APIC: 64 { 65 struct acpi_madt_local_x2apic *p = 66 (struct acpi_madt_local_x2apic *)header; 67 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 68 p->local_apic_id, p->uid, 69 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 70 } 71 break; 72 73 case ACPI_MADT_TYPE_IO_APIC: 74 { 75 struct acpi_madt_io_apic *p = 76 (struct acpi_madt_io_apic *)header; 77 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 78 p->id, p->address, p->global_irq_base); 79 } 80 break; 81 82 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 83 { 84 struct acpi_madt_interrupt_override *p = 85 (struct acpi_madt_interrupt_override *)header; 86 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 87 p->bus, p->source_irq, p->global_irq, 88 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 89 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 90 if (p->inti_flags & 91 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 92 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 93 p->inti_flags & 94 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 95 } 96 break; 97 98 case ACPI_MADT_TYPE_NMI_SOURCE: 99 { 100 struct acpi_madt_nmi_source *p = 101 (struct acpi_madt_nmi_source *)header; 102 pr_info("NMI_SRC (%s %s global_irq %d)\n", 103 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 104 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 105 p->global_irq); 106 } 107 break; 108 109 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 110 { 111 struct acpi_madt_local_apic_nmi *p = 112 (struct acpi_madt_local_apic_nmi *)header; 113 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 114 p->processor_id, 115 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 116 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 117 p->lint); 118 } 119 break; 120 121 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 122 { 123 u16 polarity, trigger; 124 struct acpi_madt_local_x2apic_nmi *p = 125 (struct acpi_madt_local_x2apic_nmi *)header; 126 127 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 128 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 129 130 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 131 p->uid, 132 mps_inti_flags_polarity[polarity], 133 mps_inti_flags_trigger[trigger], 134 p->lint); 135 } 136 break; 137 138 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 139 { 140 struct acpi_madt_local_apic_override *p = 141 (struct acpi_madt_local_apic_override *)header; 142 pr_info("LAPIC_ADDR_OVR (address[0x%llx])\n", 143 p->address); 144 } 145 break; 146 147 case ACPI_MADT_TYPE_IO_SAPIC: 148 { 149 struct acpi_madt_io_sapic *p = 150 (struct acpi_madt_io_sapic *)header; 151 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 152 p->id, (void *)(unsigned long)p->address, 153 p->global_irq_base); 154 } 155 break; 156 157 case ACPI_MADT_TYPE_LOCAL_SAPIC: 158 { 159 struct acpi_madt_local_sapic *p = 160 (struct acpi_madt_local_sapic *)header; 161 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 162 p->processor_id, p->id, p->eid, 163 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 164 } 165 break; 166 167 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 168 { 169 struct acpi_madt_interrupt_source *p = 170 (struct acpi_madt_interrupt_source *)header; 171 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", 172 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 173 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 174 p->type, p->id, p->eid, p->io_sapic_vector, 175 p->global_irq); 176 } 177 break; 178 179 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 180 { 181 struct acpi_madt_generic_interrupt *p = 182 (struct acpi_madt_generic_interrupt *)header; 183 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 184 p->uid, p->base_address, 185 p->arm_mpidr, 186 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 187 188 } 189 break; 190 191 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 192 { 193 struct acpi_madt_generic_distributor *p = 194 (struct acpi_madt_generic_distributor *)header; 195 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 196 p->gic_id, p->base_address, 197 p->global_irq_base); 198 } 199 break; 200 201 case ACPI_MADT_TYPE_MULTIPROC_WAKEUP: 202 { 203 struct acpi_madt_multiproc_wakeup *p = 204 (struct acpi_madt_multiproc_wakeup *)header; 205 u64 reset_vector = 0; 206 207 if (p->version >= ACPI_MADT_MP_WAKEUP_VERSION_V1) 208 reset_vector = p->reset_vector; 209 210 pr_debug("MP Wakeup (version[%d], mailbox[%#llx], reset[%#llx])\n", 211 p->version, p->mailbox_address, reset_vector); 212 } 213 break; 214 215 case ACPI_MADT_TYPE_CORE_PIC: 216 { 217 struct acpi_madt_core_pic *p = (struct acpi_madt_core_pic *)header; 218 219 pr_debug("CORE PIC (processor_id[0x%02x] core_id[0x%02x] %s)\n", 220 p->processor_id, p->core_id, 221 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 222 } 223 break; 224 225 case ACPI_MADT_TYPE_RINTC: 226 { 227 struct acpi_madt_rintc *p = (struct acpi_madt_rintc *)header; 228 229 pr_debug("RISC-V INTC (acpi_uid[0x%04x] hart_id[0x%llx] %s)\n", 230 p->uid, p->hart_id, 231 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 232 } 233 break; 234 235 default: 236 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 237 header->type); 238 break; 239 } 240 } 241 acpi_table_parse_entries_array(char * id,unsigned long table_size,struct acpi_subtable_proc * proc,int proc_num,unsigned int max_entries)242 int __init_or_acpilib acpi_table_parse_entries_array( 243 char *id, unsigned long table_size, struct acpi_subtable_proc *proc, 244 int proc_num, unsigned int max_entries) 245 { 246 struct acpi_table_header *table_header = NULL; 247 int count; 248 u32 instance = 0; 249 250 if (acpi_disabled) 251 return -ENODEV; 252 253 if (!id) 254 return -EINVAL; 255 256 if (!table_size) 257 return -EINVAL; 258 259 if (!strncmp(id, ACPI_SIG_MADT, 4)) 260 instance = acpi_apic_instance; 261 262 acpi_get_table(id, instance, &table_header); 263 if (!table_header) { 264 pr_debug("%4.4s not present\n", id); 265 return -ENODEV; 266 } 267 268 count = acpi_parse_entries_array(id, table_size, 269 (union fw_table_header *)table_header, 270 0, proc, proc_num, max_entries); 271 272 acpi_put_table(table_header); 273 return count; 274 } 275 __acpi_table_parse_entries(char * id,unsigned long table_size,int entry_id,acpi_tbl_entry_handler handler,acpi_tbl_entry_handler_arg handler_arg,void * arg,unsigned int max_entries)276 static int __init_or_acpilib __acpi_table_parse_entries( 277 char *id, unsigned long table_size, int entry_id, 278 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg, 279 void *arg, unsigned int max_entries) 280 { 281 struct acpi_subtable_proc proc = { 282 .id = entry_id, 283 .handler = handler, 284 .handler_arg = handler_arg, 285 .arg = arg, 286 }; 287 288 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 289 max_entries); 290 } 291 292 int __init_or_acpilib acpi_table_parse_cedt(enum acpi_cedt_type id,acpi_tbl_entry_handler_arg handler_arg,void * arg)293 acpi_table_parse_cedt(enum acpi_cedt_type id, 294 acpi_tbl_entry_handler_arg handler_arg, void *arg) 295 { 296 return __acpi_table_parse_entries(ACPI_SIG_CEDT, 297 sizeof(struct acpi_table_cedt), id, 298 NULL, handler_arg, arg, 0); 299 } 300 EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt); 301 acpi_table_parse_entries(char * id,unsigned long table_size,int entry_id,acpi_tbl_entry_handler handler,unsigned int max_entries)302 int __init acpi_table_parse_entries(char *id, unsigned long table_size, 303 int entry_id, 304 acpi_tbl_entry_handler handler, 305 unsigned int max_entries) 306 { 307 return __acpi_table_parse_entries(id, table_size, entry_id, handler, 308 NULL, NULL, max_entries); 309 } 310 acpi_table_parse_madt(enum acpi_madt_type id,acpi_tbl_entry_handler handler,unsigned int max_entries)311 int __init acpi_table_parse_madt(enum acpi_madt_type id, 312 acpi_tbl_entry_handler handler, unsigned int max_entries) 313 { 314 return acpi_table_parse_entries(ACPI_SIG_MADT, 315 sizeof(struct acpi_table_madt), id, 316 handler, max_entries); 317 } 318 319 /** 320 * acpi_table_parse - find table with @id, run @handler on it 321 * @id: table id to find 322 * @handler: handler to run 323 * 324 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 325 * run @handler on it. 326 * 327 * Return 0 if table found, -errno if not. 328 */ acpi_table_parse(char * id,acpi_tbl_table_handler handler)329 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 330 { 331 struct acpi_table_header *table = NULL; 332 333 if (acpi_disabled) 334 return -ENODEV; 335 336 if (!id || !handler) 337 return -EINVAL; 338 339 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 340 acpi_get_table(id, acpi_apic_instance, &table); 341 else 342 acpi_get_table(id, 0, &table); 343 344 if (table) { 345 handler(table); 346 acpi_put_table(table); 347 return 0; 348 } else 349 return -ENODEV; 350 } 351 352 /* 353 * The BIOS is supposed to supply a single APIC/MADT, 354 * but some report two. Provide a knob to use either. 355 * (don't you wish instance 0 and 1 were not the same?) 356 */ check_multiple_madt(void)357 static void __init check_multiple_madt(void) 358 { 359 struct acpi_table_header *table = NULL; 360 361 acpi_get_table(ACPI_SIG_MADT, 2, &table); 362 if (table) { 363 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 364 acpi_apic_instance); 365 pr_warn("If \"acpi_apic_instance=%d\" works better, " 366 "notify linux-acpi@vger.kernel.org\n", 367 acpi_apic_instance ? 0 : 2); 368 acpi_put_table(table); 369 370 } else 371 acpi_apic_instance = 0; 372 373 return; 374 } 375 acpi_table_taint(struct acpi_table_header * table)376 static void acpi_table_taint(struct acpi_table_header *table) 377 { 378 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 379 table->signature, table->oem_table_id); 380 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 381 } 382 383 #ifdef CONFIG_ACPI_TABLE_UPGRADE 384 static u64 acpi_tables_addr; 385 static int all_tables_size; 386 387 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ acpi_table_checksum(u8 * buffer,u32 length)388 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 389 { 390 u8 sum = 0; 391 u8 *end = buffer + length; 392 393 while (buffer < end) 394 sum = (u8) (sum + *(buffer++)); 395 return sum; 396 } 397 398 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 399 static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = { 400 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, 401 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, 402 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, 403 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, 404 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, 405 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, 406 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, 407 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, 408 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, 409 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, 410 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI, 411 ACPI_SIG_NBFT }; 412 413 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 414 415 #define NR_ACPI_INITRD_TABLES 64 416 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 417 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 418 419 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 420 acpi_table_upgrade(void)421 void __init acpi_table_upgrade(void) 422 { 423 void *data; 424 size_t size; 425 int sig, no, table_nr = 0, total_offset = 0; 426 long offset = 0; 427 struct acpi_table_header *table; 428 char cpio_path[32] = "kernel/firmware/acpi/"; 429 struct cpio_data file; 430 431 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) { 432 data = __initramfs_start; 433 size = __initramfs_size; 434 } else { 435 data = (void *)initrd_start; 436 size = initrd_end - initrd_start; 437 } 438 439 if (data == NULL || size == 0) 440 return; 441 442 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 443 file = find_cpio_data(cpio_path, data, size, &offset); 444 if (!file.data) 445 break; 446 447 data += offset; 448 size -= offset; 449 450 if (file.size < sizeof(struct acpi_table_header)) { 451 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 452 cpio_path, file.name); 453 continue; 454 } 455 456 table = file.data; 457 458 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++) 459 if (!memcmp(table->signature, table_sigs[sig], 4)) 460 break; 461 462 if (sig >= ARRAY_SIZE(table_sigs)) { 463 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 464 cpio_path, file.name); 465 continue; 466 } 467 if (file.size != table->length) { 468 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 469 cpio_path, file.name); 470 continue; 471 } 472 if (acpi_table_checksum(file.data, table->length)) { 473 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 474 cpio_path, file.name); 475 continue; 476 } 477 478 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 479 table->signature, cpio_path, file.name, table->length); 480 481 all_tables_size += table->length; 482 acpi_initrd_files[table_nr].data = file.data; 483 acpi_initrd_files[table_nr].size = file.size; 484 table_nr++; 485 } 486 if (table_nr == 0) 487 return; 488 489 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) { 490 pr_notice("kernel is locked down, ignoring table override\n"); 491 return; 492 } 493 494 acpi_tables_addr = 495 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE, 496 0, ACPI_TABLE_UPGRADE_MAX_PHYS); 497 if (!acpi_tables_addr) { 498 WARN_ON(1); 499 return; 500 } 501 /* 502 * Only calling e820_add_reserve does not work and the 503 * tables are invalid (memory got used) later. 504 * memblock_reserve works as expected and the tables won't get modified. 505 * But it's not enough on X86 because ioremap will 506 * complain later (used by acpi_os_map_memory) that the pages 507 * that should get mapped are not marked "reserved". 508 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 509 * works fine. 510 */ 511 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 512 513 kmemleak_ignore_phys(acpi_tables_addr); 514 515 /* 516 * early_ioremap only can remap 256k one time. If we map all 517 * tables one time, we will hit the limit. Need to map chunks 518 * one by one during copying the same as that in relocate_initrd(). 519 */ 520 for (no = 0; no < table_nr; no++) { 521 unsigned char *src_p = acpi_initrd_files[no].data; 522 phys_addr_t size = acpi_initrd_files[no].size; 523 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 524 phys_addr_t slop, clen; 525 char *dest_p; 526 527 total_offset += size; 528 529 while (size) { 530 slop = dest_addr & ~PAGE_MASK; 531 clen = size; 532 if (clen > MAP_CHUNK_SIZE - slop) 533 clen = MAP_CHUNK_SIZE - slop; 534 dest_p = early_memremap(dest_addr & PAGE_MASK, 535 clen + slop); 536 memcpy(dest_p + slop, src_p, clen); 537 early_memunmap(dest_p, clen + slop); 538 src_p += clen; 539 dest_addr += clen; 540 size -= clen; 541 } 542 } 543 } 544 545 static acpi_status acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * length)546 acpi_table_initrd_override(struct acpi_table_header *existing_table, 547 acpi_physical_address *address, u32 *length) 548 { 549 int table_offset = 0; 550 int table_index = 0; 551 struct acpi_table_header *table; 552 u32 table_length; 553 554 *length = 0; 555 *address = 0; 556 if (!acpi_tables_addr) 557 return AE_OK; 558 559 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 560 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 561 ACPI_HEADER_SIZE); 562 if (table_offset + table->length > all_tables_size) { 563 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 564 WARN_ON(1); 565 return AE_OK; 566 } 567 568 table_length = table->length; 569 570 /* Only override tables matched */ 571 if (memcmp(existing_table->signature, table->signature, 4) || 572 memcmp(table->oem_id, existing_table->oem_id, 573 ACPI_OEM_ID_SIZE) || 574 memcmp(table->oem_table_id, existing_table->oem_table_id, 575 ACPI_OEM_TABLE_ID_SIZE)) { 576 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 577 goto next_table; 578 } 579 /* 580 * Mark the table to avoid being used in 581 * acpi_table_initrd_scan() and check the revision. 582 */ 583 if (test_and_set_bit(table_index, acpi_initrd_installed) || 584 existing_table->oem_revision >= table->oem_revision) { 585 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 586 goto next_table; 587 } 588 589 *length = table_length; 590 *address = acpi_tables_addr + table_offset; 591 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 592 table->signature, table->oem_id, 593 table->oem_table_id); 594 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 595 break; 596 597 next_table: 598 table_offset += table_length; 599 table_index++; 600 } 601 return AE_OK; 602 } 603 acpi_table_initrd_scan(void)604 static void __init acpi_table_initrd_scan(void) 605 { 606 int table_offset = 0; 607 int table_index = 0; 608 u32 table_length; 609 struct acpi_table_header *table; 610 611 if (!acpi_tables_addr) 612 return; 613 614 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 615 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 616 ACPI_HEADER_SIZE); 617 if (table_offset + table->length > all_tables_size) { 618 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 619 WARN_ON(1); 620 return; 621 } 622 623 table_length = table->length; 624 625 /* Skip RSDT/XSDT which should only be used for override */ 626 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 627 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 628 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 629 goto next_table; 630 } 631 /* 632 * Mark the table to avoid being used in 633 * acpi_table_initrd_override(). Though this is not possible 634 * because override is disabled in acpi_install_physical_table(). 635 */ 636 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 637 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 638 goto next_table; 639 } 640 641 pr_info("Table Upgrade: install [%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 acpi_install_physical_table(acpi_tables_addr + table_offset); 646 next_table: 647 table_offset += table_length; 648 table_index++; 649 } 650 } 651 #else 652 static acpi_status acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)653 acpi_table_initrd_override(struct acpi_table_header *existing_table, 654 acpi_physical_address *address, 655 u32 *table_length) 656 { 657 *table_length = 0; 658 *address = 0; 659 return AE_OK; 660 } 661 acpi_table_initrd_scan(void)662 static void __init acpi_table_initrd_scan(void) 663 { 664 } 665 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 666 667 acpi_status acpi_os_physical_table_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)668 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 669 acpi_physical_address *address, 670 u32 *table_length) 671 { 672 return acpi_table_initrd_override(existing_table, address, 673 table_length); 674 } 675 676 #ifdef CONFIG_ACPI_CUSTOM_DSDT 677 static void *amlcode __attribute__ ((weakref("AmlCode"))); 678 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); 679 #endif 680 acpi_os_table_override(struct acpi_table_header * existing_table,struct acpi_table_header ** new_table)681 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, 682 struct acpi_table_header **new_table) 683 { 684 if (!existing_table || !new_table) 685 return AE_BAD_PARAMETER; 686 687 *new_table = NULL; 688 689 #ifdef CONFIG_ACPI_CUSTOM_DSDT 690 if (!strncmp(existing_table->signature, "DSDT", 4)) { 691 *new_table = (struct acpi_table_header *)&amlcode; 692 if (!(*new_table)) 693 *new_table = (struct acpi_table_header *)&dsdt_amlcode; 694 } 695 #endif 696 if (*new_table != NULL) 697 acpi_table_taint(existing_table); 698 return AE_OK; 699 } 700 701 /* 702 * acpi_locate_initial_tables() 703 * 704 * Get the RSDP, then find and checksum all the ACPI tables. 705 * 706 * result: initial_tables[] is initialized, and points to 707 * a list of ACPI tables. 708 */ acpi_locate_initial_tables(void)709 int __init acpi_locate_initial_tables(void) 710 { 711 acpi_status status; 712 713 if (acpi_verify_table_checksum) { 714 pr_info("Early table checksum verification enabled\n"); 715 acpi_gbl_enable_table_validation = TRUE; 716 } else { 717 pr_info("Early table checksum verification disabled\n"); 718 acpi_gbl_enable_table_validation = FALSE; 719 } 720 721 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 722 if (ACPI_FAILURE(status)) 723 return -EINVAL; 724 725 return 0; 726 } 727 acpi_reserve_initial_tables(void)728 void __init acpi_reserve_initial_tables(void) 729 { 730 int i; 731 732 for (i = 0; i < ACPI_MAX_TABLES; i++) { 733 struct acpi_table_desc *table_desc = &initial_tables[i]; 734 u64 start = table_desc->address; 735 u64 size = table_desc->length; 736 737 if (!start || !size) 738 break; 739 740 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n", 741 table_desc->signature.ascii, start, start + size - 1); 742 743 memblock_reserve(start, size); 744 } 745 } 746 acpi_table_init_complete(void)747 void __init acpi_table_init_complete(void) 748 { 749 acpi_table_initrd_scan(); 750 check_multiple_madt(); 751 } 752 acpi_table_init(void)753 int __init acpi_table_init(void) 754 { 755 int ret; 756 757 ret = acpi_locate_initial_tables(); 758 if (ret) 759 return ret; 760 761 acpi_table_init_complete(); 762 763 return 0; 764 } 765 acpi_parse_apic_instance(char * str)766 static int __init acpi_parse_apic_instance(char *str) 767 { 768 if (!str) 769 return -EINVAL; 770 771 if (kstrtoint(str, 0, &acpi_apic_instance)) 772 return -EINVAL; 773 774 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 775 776 return 0; 777 } 778 early_param("acpi_apic_instance", acpi_parse_apic_instance); 779 acpi_force_table_verification_setup(char * s)780 static int __init acpi_force_table_verification_setup(char *s) 781 { 782 acpi_verify_table_checksum = true; 783 784 return 0; 785 } 786 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 787 acpi_force_32bit_fadt_addr(char * s)788 static int __init acpi_force_32bit_fadt_addr(char *s) 789 { 790 pr_info("Forcing 32 Bit FADT addresses\n"); 791 acpi_gbl_use32_bit_fadt_addresses = TRUE; 792 793 return 0; 794 } 795 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 796