1 /****************************************************************************** 2 * 3 * Module Name: tbxface - Public interfaces to the ACPI subsystem 4 * ACPI table oriented interfaces 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2012, Intel Corp. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45 #include <linux/export.h> 46 #include <acpi/acpi.h> 47 #include "accommon.h" 48 #include "acnamesp.h" 49 #include "actables.h" 50 51 #define _COMPONENT ACPI_TABLES 52 ACPI_MODULE_NAME("tbxface") 53 54 /* Local prototypes */ 55 static acpi_status acpi_tb_load_namespace(void); 56 57 static int no_auto_ssdt; 58 59 /******************************************************************************* 60 * 61 * FUNCTION: acpi_allocate_root_table 62 * 63 * PARAMETERS: initial_table_count - Size of initial_table_array, in number of 64 * struct acpi_table_desc structures 65 * 66 * RETURN: Status 67 * 68 * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and 69 * acpi_initialize_tables. 70 * 71 ******************************************************************************/ 72 73 acpi_status acpi_allocate_root_table(u32 initial_table_count) 74 { 75 76 acpi_gbl_root_table_list.max_table_count = initial_table_count; 77 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE; 78 79 return (acpi_tb_resize_root_table_list()); 80 } 81 82 /******************************************************************************* 83 * 84 * FUNCTION: acpi_initialize_tables 85 * 86 * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated 87 * struct acpi_table_desc structures. If NULL, the 88 * array is dynamically allocated. 89 * initial_table_count - Size of initial_table_array, in number of 90 * struct acpi_table_desc structures 91 * allow_realloc - Flag to tell Table Manager if resize of 92 * pre-allocated array is allowed. Ignored 93 * if initial_table_array is NULL. 94 * 95 * RETURN: Status 96 * 97 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT. 98 * 99 * NOTE: Allows static allocation of the initial table array in order 100 * to avoid the use of dynamic memory in confined environments 101 * such as the kernel boot sequence where it may not be available. 102 * 103 * If the host OS memory managers are initialized, use NULL for 104 * initial_table_array, and the table will be dynamically allocated. 105 * 106 ******************************************************************************/ 107 108 acpi_status __init 109 acpi_initialize_tables(struct acpi_table_desc * initial_table_array, 110 u32 initial_table_count, u8 allow_resize) 111 { 112 acpi_physical_address rsdp_address; 113 acpi_status status; 114 115 ACPI_FUNCTION_TRACE(acpi_initialize_tables); 116 117 /* 118 * Set up the Root Table Array 119 * Allocate the table array if requested 120 */ 121 if (!initial_table_array) { 122 status = acpi_allocate_root_table(initial_table_count); 123 if (ACPI_FAILURE(status)) { 124 return_ACPI_STATUS(status); 125 } 126 } else { 127 /* Root Table Array has been statically allocated by the host */ 128 129 ACPI_MEMSET(initial_table_array, 0, 130 (acpi_size) initial_table_count * 131 sizeof(struct acpi_table_desc)); 132 133 acpi_gbl_root_table_list.tables = initial_table_array; 134 acpi_gbl_root_table_list.max_table_count = initial_table_count; 135 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN; 136 if (allow_resize) { 137 acpi_gbl_root_table_list.flags |= 138 ACPI_ROOT_ALLOW_RESIZE; 139 } 140 } 141 142 /* Get the address of the RSDP */ 143 144 rsdp_address = acpi_os_get_root_pointer(); 145 if (!rsdp_address) { 146 return_ACPI_STATUS(AE_NOT_FOUND); 147 } 148 149 /* 150 * Get the root table (RSDT or XSDT) and extract all entries to the local 151 * Root Table Array. This array contains the information of the RSDT/XSDT 152 * in a common, more useable format. 153 */ 154 status = acpi_tb_parse_root_table(rsdp_address); 155 return_ACPI_STATUS(status); 156 } 157 158 /******************************************************************************* 159 * 160 * FUNCTION: acpi_reallocate_root_table 161 * 162 * PARAMETERS: None 163 * 164 * RETURN: Status 165 * 166 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the 167 * root list from the previously provided scratch area. Should 168 * be called once dynamic memory allocation is available in the 169 * kernel 170 * 171 ******************************************************************************/ 172 acpi_status acpi_reallocate_root_table(void) 173 { 174 struct acpi_table_desc *tables; 175 acpi_size new_size; 176 acpi_size current_size; 177 178 ACPI_FUNCTION_TRACE(acpi_reallocate_root_table); 179 180 /* 181 * Only reallocate the root table if the host provided a static buffer 182 * for the table array in the call to acpi_initialize_tables. 183 */ 184 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) { 185 return_ACPI_STATUS(AE_SUPPORT); 186 } 187 188 /* 189 * Get the current size of the root table and add the default 190 * increment to create the new table size. 191 */ 192 current_size = (acpi_size) 193 acpi_gbl_root_table_list.current_table_count * 194 sizeof(struct acpi_table_desc); 195 196 new_size = current_size + 197 (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc)); 198 199 /* Create new array and copy the old array */ 200 201 tables = ACPI_ALLOCATE_ZEROED(new_size); 202 if (!tables) { 203 return_ACPI_STATUS(AE_NO_MEMORY); 204 } 205 206 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size); 207 208 /* 209 * Update the root table descriptor. The new size will be the current 210 * number of tables plus the increment, independent of the reserved 211 * size of the original table list. 212 */ 213 acpi_gbl_root_table_list.tables = tables; 214 acpi_gbl_root_table_list.max_table_count = 215 acpi_gbl_root_table_list.current_table_count + 216 ACPI_ROOT_TABLE_SIZE_INCREMENT; 217 acpi_gbl_root_table_list.flags = 218 ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE; 219 220 return_ACPI_STATUS(AE_OK); 221 } 222 223 /******************************************************************************* 224 * 225 * FUNCTION: acpi_load_table 226 * 227 * PARAMETERS: table_ptr - pointer to a buffer containing the entire 228 * table to be loaded 229 * 230 * RETURN: Status 231 * 232 * DESCRIPTION: This function is called to load a table from the caller's 233 * buffer. The buffer must contain an entire ACPI Table including 234 * a valid header. The header fields will be verified, and if it 235 * is determined that the table is invalid, the call will fail. 236 * 237 ******************************************************************************/ 238 acpi_status acpi_load_table(struct acpi_table_header *table_ptr) 239 { 240 acpi_status status; 241 u32 table_index; 242 struct acpi_table_desc table_desc; 243 244 if (!table_ptr) 245 return AE_BAD_PARAMETER; 246 247 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc)); 248 table_desc.pointer = table_ptr; 249 table_desc.length = table_ptr->length; 250 table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN; 251 252 /* 253 * Install the new table into the local data structures 254 */ 255 status = acpi_tb_add_table(&table_desc, &table_index); 256 if (ACPI_FAILURE(status)) { 257 return status; 258 } 259 status = acpi_ns_load_table(table_index, acpi_gbl_root_node); 260 return status; 261 } 262 263 ACPI_EXPORT_SYMBOL(acpi_load_table) 264 265 /******************************************************************************* 266 * 267 * FUNCTION: acpi_get_table_header 268 * 269 * PARAMETERS: Signature - ACPI signature of needed table 270 * Instance - Which instance (for SSDTs) 271 * out_table_header - The pointer to the table header to fill 272 * 273 * RETURN: Status and pointer to mapped table header 274 * 275 * DESCRIPTION: Finds an ACPI table header. 276 * 277 * NOTE: Caller is responsible in unmapping the header with 278 * acpi_os_unmap_memory 279 * 280 ******************************************************************************/ 281 acpi_status 282 acpi_get_table_header(char *signature, 283 u32 instance, struct acpi_table_header *out_table_header) 284 { 285 u32 i; 286 u32 j; 287 struct acpi_table_header *header; 288 289 /* Parameter validation */ 290 291 if (!signature || !out_table_header) { 292 return (AE_BAD_PARAMETER); 293 } 294 295 /* Walk the root table list */ 296 297 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count; 298 i++) { 299 if (!ACPI_COMPARE_NAME 300 (&(acpi_gbl_root_table_list.tables[i].signature), 301 signature)) { 302 continue; 303 } 304 305 if (++j < instance) { 306 continue; 307 } 308 309 if (!acpi_gbl_root_table_list.tables[i].pointer) { 310 if ((acpi_gbl_root_table_list.tables[i].flags & 311 ACPI_TABLE_ORIGIN_MASK) == 312 ACPI_TABLE_ORIGIN_MAPPED) { 313 header = 314 acpi_os_map_memory(acpi_gbl_root_table_list. 315 tables[i].address, 316 sizeof(struct 317 acpi_table_header)); 318 if (!header) { 319 return AE_NO_MEMORY; 320 } 321 ACPI_MEMCPY(out_table_header, header, 322 sizeof(struct acpi_table_header)); 323 acpi_os_unmap_memory(header, 324 sizeof(struct 325 acpi_table_header)); 326 } else { 327 return AE_NOT_FOUND; 328 } 329 } else { 330 ACPI_MEMCPY(out_table_header, 331 acpi_gbl_root_table_list.tables[i].pointer, 332 sizeof(struct acpi_table_header)); 333 } 334 return (AE_OK); 335 } 336 337 return (AE_NOT_FOUND); 338 } 339 340 ACPI_EXPORT_SYMBOL(acpi_get_table_header) 341 342 /******************************************************************************* 343 * 344 * FUNCTION: acpi_unload_table_id 345 * 346 * PARAMETERS: id - Owner ID of the table to be removed. 347 * 348 * RETURN: Status 349 * 350 * DESCRIPTION: This routine is used to force the unload of a table (by id) 351 * 352 ******************************************************************************/ 353 acpi_status acpi_unload_table_id(acpi_owner_id id) 354 { 355 int i; 356 acpi_status status = AE_NOT_EXIST; 357 358 ACPI_FUNCTION_TRACE(acpi_unload_table_id); 359 360 /* Find table in the global table list */ 361 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { 362 if (id != acpi_gbl_root_table_list.tables[i].owner_id) { 363 continue; 364 } 365 /* 366 * Delete all namespace objects owned by this table. Note that these 367 * objects can appear anywhere in the namespace by virtue of the AML 368 * "Scope" operator. Thus, we need to track ownership by an ID, not 369 * simply a position within the hierarchy 370 */ 371 acpi_tb_delete_namespace_by_owner(i); 372 status = acpi_tb_release_owner_id(i); 373 acpi_tb_set_table_loaded_flag(i, FALSE); 374 break; 375 } 376 return_ACPI_STATUS(status); 377 } 378 379 ACPI_EXPORT_SYMBOL(acpi_unload_table_id) 380 381 /******************************************************************************* 382 * 383 * FUNCTION: acpi_get_table_with_size 384 * 385 * PARAMETERS: Signature - ACPI signature of needed table 386 * Instance - Which instance (for SSDTs) 387 * out_table - Where the pointer to the table is returned 388 * 389 * RETURN: Status and pointer to table 390 * 391 * DESCRIPTION: Finds and verifies an ACPI table. 392 * 393 ******************************************************************************/ 394 acpi_status 395 acpi_get_table_with_size(char *signature, 396 u32 instance, struct acpi_table_header **out_table, 397 acpi_size *tbl_size) 398 { 399 u32 i; 400 u32 j; 401 acpi_status status; 402 403 /* Parameter validation */ 404 405 if (!signature || !out_table) { 406 return (AE_BAD_PARAMETER); 407 } 408 409 /* Walk the root table list */ 410 411 for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count; 412 i++) { 413 if (!ACPI_COMPARE_NAME 414 (&(acpi_gbl_root_table_list.tables[i].signature), 415 signature)) { 416 continue; 417 } 418 419 if (++j < instance) { 420 continue; 421 } 422 423 status = 424 acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]); 425 if (ACPI_SUCCESS(status)) { 426 *out_table = acpi_gbl_root_table_list.tables[i].pointer; 427 *tbl_size = acpi_gbl_root_table_list.tables[i].length; 428 } 429 430 if (!acpi_gbl_permanent_mmap) { 431 acpi_gbl_root_table_list.tables[i].pointer = NULL; 432 } 433 434 return (status); 435 } 436 437 return (AE_NOT_FOUND); 438 } 439 440 acpi_status 441 acpi_get_table(char *signature, 442 u32 instance, struct acpi_table_header **out_table) 443 { 444 acpi_size tbl_size; 445 446 return acpi_get_table_with_size(signature, 447 instance, out_table, &tbl_size); 448 } 449 ACPI_EXPORT_SYMBOL(acpi_get_table) 450 451 /******************************************************************************* 452 * 453 * FUNCTION: acpi_get_table_by_index 454 * 455 * PARAMETERS: table_index - Table index 456 * Table - Where the pointer to the table is returned 457 * 458 * RETURN: Status and pointer to the table 459 * 460 * DESCRIPTION: Obtain a table by an index into the global table list. 461 * 462 ******************************************************************************/ 463 acpi_status 464 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table) 465 { 466 acpi_status status; 467 468 ACPI_FUNCTION_TRACE(acpi_get_table_by_index); 469 470 /* Parameter validation */ 471 472 if (!table) { 473 return_ACPI_STATUS(AE_BAD_PARAMETER); 474 } 475 476 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 477 478 /* Validate index */ 479 480 if (table_index >= acpi_gbl_root_table_list.current_table_count) { 481 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 482 return_ACPI_STATUS(AE_BAD_PARAMETER); 483 } 484 485 if (!acpi_gbl_root_table_list.tables[table_index].pointer) { 486 487 /* Table is not mapped, map it */ 488 489 status = 490 acpi_tb_verify_table(&acpi_gbl_root_table_list. 491 tables[table_index]); 492 if (ACPI_FAILURE(status)) { 493 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 494 return_ACPI_STATUS(status); 495 } 496 } 497 498 *table = acpi_gbl_root_table_list.tables[table_index].pointer; 499 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 500 return_ACPI_STATUS(AE_OK); 501 } 502 503 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index) 504 505 /******************************************************************************* 506 * 507 * FUNCTION: acpi_tb_load_namespace 508 * 509 * PARAMETERS: None 510 * 511 * RETURN: Status 512 * 513 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in 514 * the RSDT/XSDT. 515 * 516 ******************************************************************************/ 517 static acpi_status acpi_tb_load_namespace(void) 518 { 519 acpi_status status; 520 u32 i; 521 struct acpi_table_header *new_dsdt; 522 523 ACPI_FUNCTION_TRACE(tb_load_namespace); 524 525 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 526 527 /* 528 * Load the namespace. The DSDT is required, but any SSDT and 529 * PSDT tables are optional. Verify the DSDT. 530 */ 531 if (!acpi_gbl_root_table_list.current_table_count || 532 !ACPI_COMPARE_NAME(& 533 (acpi_gbl_root_table_list. 534 tables[ACPI_TABLE_INDEX_DSDT].signature), 535 ACPI_SIG_DSDT) 536 || 537 ACPI_FAILURE(acpi_tb_verify_table 538 (&acpi_gbl_root_table_list. 539 tables[ACPI_TABLE_INDEX_DSDT]))) { 540 status = AE_NO_ACPI_TABLES; 541 goto unlock_and_exit; 542 } 543 544 /* 545 * Save the DSDT pointer for simple access. This is the mapped memory 546 * address. We must take care here because the address of the .Tables 547 * array can change dynamically as tables are loaded at run-time. Note: 548 * .Pointer field is not validated until after call to acpi_tb_verify_table. 549 */ 550 acpi_gbl_DSDT = 551 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer; 552 553 /* 554 * Optionally copy the entire DSDT to local memory (instead of simply 555 * mapping it.) There are some BIOSs that corrupt or replace the original 556 * DSDT, creating the need for this option. Default is FALSE, do not copy 557 * the DSDT. 558 */ 559 if (acpi_gbl_copy_dsdt_locally) { 560 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT); 561 if (new_dsdt) { 562 acpi_gbl_DSDT = new_dsdt; 563 } 564 } 565 566 /* 567 * Save the original DSDT header for detection of table corruption 568 * and/or replacement of the DSDT from outside the OS. 569 */ 570 ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, 571 sizeof(struct acpi_table_header)); 572 573 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 574 575 /* Load and parse tables */ 576 577 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node); 578 if (ACPI_FAILURE(status)) { 579 return_ACPI_STATUS(status); 580 } 581 582 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ 583 584 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 585 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { 586 if ((!ACPI_COMPARE_NAME 587 (&(acpi_gbl_root_table_list.tables[i].signature), 588 ACPI_SIG_SSDT) 589 && 590 !ACPI_COMPARE_NAME(& 591 (acpi_gbl_root_table_list.tables[i]. 592 signature), ACPI_SIG_PSDT)) 593 || 594 ACPI_FAILURE(acpi_tb_verify_table 595 (&acpi_gbl_root_table_list.tables[i]))) { 596 continue; 597 } 598 599 if (no_auto_ssdt) { 600 printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n"); 601 continue; 602 } 603 604 /* Ignore errors while loading tables, get as many as possible */ 605 606 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 607 (void)acpi_ns_load_table(i, acpi_gbl_root_node); 608 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 609 } 610 611 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n")); 612 613 unlock_and_exit: 614 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 615 return_ACPI_STATUS(status); 616 } 617 618 /******************************************************************************* 619 * 620 * FUNCTION: acpi_load_tables 621 * 622 * PARAMETERS: None 623 * 624 * RETURN: Status 625 * 626 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT 627 * 628 ******************************************************************************/ 629 630 acpi_status acpi_load_tables(void) 631 { 632 acpi_status status; 633 634 ACPI_FUNCTION_TRACE(acpi_load_tables); 635 636 /* Load the namespace from the tables */ 637 638 status = acpi_tb_load_namespace(); 639 if (ACPI_FAILURE(status)) { 640 ACPI_EXCEPTION((AE_INFO, status, 641 "While loading namespace from ACPI tables")); 642 } 643 644 return_ACPI_STATUS(status); 645 } 646 647 ACPI_EXPORT_SYMBOL(acpi_load_tables) 648 649 650 /******************************************************************************* 651 * 652 * FUNCTION: acpi_install_table_handler 653 * 654 * PARAMETERS: Handler - Table event handler 655 * Context - Value passed to the handler on each event 656 * 657 * RETURN: Status 658 * 659 * DESCRIPTION: Install table event handler 660 * 661 ******************************************************************************/ 662 acpi_status 663 acpi_install_table_handler(acpi_tbl_handler handler, void *context) 664 { 665 acpi_status status; 666 667 ACPI_FUNCTION_TRACE(acpi_install_table_handler); 668 669 if (!handler) { 670 return_ACPI_STATUS(AE_BAD_PARAMETER); 671 } 672 673 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); 674 if (ACPI_FAILURE(status)) { 675 return_ACPI_STATUS(status); 676 } 677 678 /* Don't allow more than one handler */ 679 680 if (acpi_gbl_table_handler) { 681 status = AE_ALREADY_EXISTS; 682 goto cleanup; 683 } 684 685 /* Install the handler */ 686 687 acpi_gbl_table_handler = handler; 688 acpi_gbl_table_handler_context = context; 689 690 cleanup: 691 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); 692 return_ACPI_STATUS(status); 693 } 694 695 ACPI_EXPORT_SYMBOL(acpi_install_table_handler) 696 697 /******************************************************************************* 698 * 699 * FUNCTION: acpi_remove_table_handler 700 * 701 * PARAMETERS: Handler - Table event handler that was installed 702 * previously. 703 * 704 * RETURN: Status 705 * 706 * DESCRIPTION: Remove table event handler 707 * 708 ******************************************************************************/ 709 acpi_status acpi_remove_table_handler(acpi_tbl_handler handler) 710 { 711 acpi_status status; 712 713 ACPI_FUNCTION_TRACE(acpi_remove_table_handler); 714 715 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); 716 if (ACPI_FAILURE(status)) { 717 return_ACPI_STATUS(status); 718 } 719 720 /* Make sure that the installed handler is the same */ 721 722 if (!handler || handler != acpi_gbl_table_handler) { 723 status = AE_BAD_PARAMETER; 724 goto cleanup; 725 } 726 727 /* Remove the handler */ 728 729 acpi_gbl_table_handler = NULL; 730 731 cleanup: 732 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); 733 return_ACPI_STATUS(status); 734 } 735 736 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler) 737 738 739 static int __init acpi_no_auto_ssdt_setup(char *s) { 740 741 printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n"); 742 743 no_auto_ssdt = 1; 744 745 return 1; 746 } 747 748 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup); 749