1 /****************************************************************************** 2 * 3 * Module Name: tbxface - ACPI table-oriented external interfaces 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #define EXPORT_ACPI_INTERFACES 153 154 #include "acpi.h" 155 #include "accommon.h" 156 #include "actables.h" 157 158 #define _COMPONENT ACPI_TABLES 159 ACPI_MODULE_NAME ("tbxface") 160 161 162 /******************************************************************************* 163 * 164 * FUNCTION: AcpiAllocateRootTable 165 * 166 * PARAMETERS: InitialTableCount - Size of InitialTableArray, in number of 167 * ACPI_TABLE_DESC structures 168 * 169 * RETURN: Status 170 * 171 * DESCRIPTION: Allocate a root table array. Used by iASL compiler and 172 * AcpiInitializeTables. 173 * 174 ******************************************************************************/ 175 176 ACPI_STATUS 177 AcpiAllocateRootTable ( 178 UINT32 InitialTableCount) 179 { 180 181 AcpiGbl_RootTableList.MaxTableCount = InitialTableCount; 182 AcpiGbl_RootTableList.Flags = ACPI_ROOT_ALLOW_RESIZE; 183 184 return (AcpiTbResizeRootTableList ()); 185 } 186 187 188 /******************************************************************************* 189 * 190 * FUNCTION: AcpiInitializeTables 191 * 192 * PARAMETERS: InitialTableArray - Pointer to an array of pre-allocated 193 * ACPI_TABLE_DESC structures. If NULL, the 194 * array is dynamically allocated. 195 * InitialTableCount - Size of InitialTableArray, in number of 196 * ACPI_TABLE_DESC structures 197 * AllowResize - Flag to tell Table Manager if resize of 198 * pre-allocated array is allowed. Ignored 199 * if InitialTableArray is NULL. 200 * 201 * RETURN: Status 202 * 203 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT. 204 * 205 * NOTE: Allows static allocation of the initial table array in order 206 * to avoid the use of dynamic memory in confined environments 207 * such as the kernel boot sequence where it may not be available. 208 * 209 * If the host OS memory managers are initialized, use NULL for 210 * InitialTableArray, and the table will be dynamically allocated. 211 * 212 ******************************************************************************/ 213 214 ACPI_STATUS ACPI_INIT_FUNCTION 215 AcpiInitializeTables ( 216 ACPI_TABLE_DESC *InitialTableArray, 217 UINT32 InitialTableCount, 218 BOOLEAN AllowResize) 219 { 220 ACPI_PHYSICAL_ADDRESS RsdpAddress; 221 ACPI_STATUS Status; 222 223 224 ACPI_FUNCTION_TRACE (AcpiInitializeTables); 225 226 227 /* 228 * Setup the Root Table Array and allocate the table array 229 * if requested 230 */ 231 if (!InitialTableArray) 232 { 233 Status = AcpiAllocateRootTable (InitialTableCount); 234 if (ACPI_FAILURE (Status)) 235 { 236 return_ACPI_STATUS (Status); 237 } 238 } 239 else 240 { 241 /* Root Table Array has been statically allocated by the host */ 242 243 memset (InitialTableArray, 0, 244 (ACPI_SIZE) InitialTableCount * sizeof (ACPI_TABLE_DESC)); 245 246 AcpiGbl_RootTableList.Tables = InitialTableArray; 247 AcpiGbl_RootTableList.MaxTableCount = InitialTableCount; 248 AcpiGbl_RootTableList.Flags = ACPI_ROOT_ORIGIN_UNKNOWN; 249 if (AllowResize) 250 { 251 AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ALLOW_RESIZE; 252 } 253 } 254 255 /* Get the address of the RSDP */ 256 257 RsdpAddress = AcpiOsGetRootPointer (); 258 if (!RsdpAddress) 259 { 260 return_ACPI_STATUS (AE_NOT_FOUND); 261 } 262 263 /* 264 * Get the root table (RSDT or XSDT) and extract all entries to the local 265 * Root Table Array. This array contains the information of the RSDT/XSDT 266 * in a common, more useable format. 267 */ 268 Status = AcpiTbParseRootTable (RsdpAddress); 269 return_ACPI_STATUS (Status); 270 } 271 272 ACPI_EXPORT_SYMBOL_INIT (AcpiInitializeTables) 273 274 275 /******************************************************************************* 276 * 277 * FUNCTION: AcpiReallocateRootTable 278 * 279 * PARAMETERS: None 280 * 281 * RETURN: Status 282 * 283 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the 284 * root list from the previously provided scratch area. Should 285 * be called once dynamic memory allocation is available in the 286 * kernel. 287 * 288 ******************************************************************************/ 289 290 ACPI_STATUS ACPI_INIT_FUNCTION 291 AcpiReallocateRootTable ( 292 void) 293 { 294 ACPI_STATUS Status; 295 ACPI_TABLE_DESC *TableDesc; 296 UINT32 i, j; 297 298 299 ACPI_FUNCTION_TRACE (AcpiReallocateRootTable); 300 301 302 /* 303 * If there are tables unverified, it is required to reallocate the 304 * root table list to clean up invalid table entries. Otherwise only 305 * reallocate the root table list if the host provided a static buffer 306 * for the table array in the call to AcpiInitializeTables(). 307 */ 308 if ((AcpiGbl_RootTableList.Flags & ACPI_ROOT_ORIGIN_ALLOCATED) && 309 AcpiGbl_EnableTableValidation) 310 { 311 return_ACPI_STATUS (AE_SUPPORT); 312 } 313 314 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES); 315 316 /* 317 * Ensure OS early boot logic, which is required by some hosts. If the 318 * table state is reported to be wrong, developers should fix the 319 * issue by invoking AcpiPutTable() for the reported table during the 320 * early stage. 321 */ 322 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i) 323 { 324 TableDesc = &AcpiGbl_RootTableList.Tables[i]; 325 if (TableDesc->Pointer) 326 { 327 ACPI_ERROR ((AE_INFO, 328 "Table [%4.4s] is not invalidated during early boot stage", 329 TableDesc->Signature.Ascii)); 330 } 331 } 332 333 if (!AcpiGbl_EnableTableValidation) 334 { 335 /* 336 * Now it's safe to do full table validation. We can do deferred 337 * table initilization here once the flag is set. 338 */ 339 AcpiGbl_EnableTableValidation = TRUE; 340 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i) 341 { 342 TableDesc = &AcpiGbl_RootTableList.Tables[i]; 343 if (!(TableDesc->Flags & ACPI_TABLE_IS_VERIFIED)) 344 { 345 Status = AcpiTbVerifyTempTable (TableDesc, NULL, &j); 346 if (ACPI_FAILURE (Status)) 347 { 348 AcpiTbUninstallTable (TableDesc); 349 } 350 } 351 } 352 } 353 354 AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ALLOW_RESIZE; 355 Status = AcpiTbResizeRootTableList (); 356 AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ORIGIN_ALLOCATED; 357 358 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES); 359 return_ACPI_STATUS (Status); 360 } 361 362 ACPI_EXPORT_SYMBOL_INIT (AcpiReallocateRootTable) 363 364 365 /******************************************************************************* 366 * 367 * FUNCTION: AcpiGetTableHeader 368 * 369 * PARAMETERS: Signature - ACPI signature of needed table 370 * Instance - Which instance (for SSDTs) 371 * OutTableHeader - The pointer to the table header to fill 372 * 373 * RETURN: Status and pointer to mapped table header 374 * 375 * DESCRIPTION: Finds an ACPI table header. 376 * 377 * NOTE: Caller is responsible in unmapping the header with 378 * AcpiOsUnmapMemory 379 * 380 ******************************************************************************/ 381 382 ACPI_STATUS 383 AcpiGetTableHeader ( 384 char *Signature, 385 UINT32 Instance, 386 ACPI_TABLE_HEADER *OutTableHeader) 387 { 388 UINT32 i; 389 UINT32 j; 390 ACPI_TABLE_HEADER *Header; 391 392 393 /* Parameter validation */ 394 395 if (!Signature || !OutTableHeader) 396 { 397 return (AE_BAD_PARAMETER); 398 } 399 400 /* Walk the root table list */ 401 402 for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++) 403 { 404 if (!ACPI_COMPARE_NAME ( 405 &(AcpiGbl_RootTableList.Tables[i].Signature), Signature)) 406 { 407 continue; 408 } 409 410 if (++j < Instance) 411 { 412 continue; 413 } 414 415 if (!AcpiGbl_RootTableList.Tables[i].Pointer) 416 { 417 if ((AcpiGbl_RootTableList.Tables[i].Flags & 418 ACPI_TABLE_ORIGIN_MASK) == 419 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL) 420 { 421 Header = AcpiOsMapMemory ( 422 AcpiGbl_RootTableList.Tables[i].Address, 423 sizeof (ACPI_TABLE_HEADER)); 424 if (!Header) 425 { 426 return (AE_NO_MEMORY); 427 } 428 429 memcpy (OutTableHeader, Header, sizeof (ACPI_TABLE_HEADER)); 430 AcpiOsUnmapMemory (Header, sizeof (ACPI_TABLE_HEADER)); 431 } 432 else 433 { 434 return (AE_NOT_FOUND); 435 } 436 } 437 else 438 { 439 memcpy (OutTableHeader, 440 AcpiGbl_RootTableList.Tables[i].Pointer, 441 sizeof (ACPI_TABLE_HEADER)); 442 } 443 444 return (AE_OK); 445 } 446 447 return (AE_NOT_FOUND); 448 } 449 450 ACPI_EXPORT_SYMBOL (AcpiGetTableHeader) 451 452 453 /******************************************************************************* 454 * 455 * FUNCTION: AcpiGetTable 456 * 457 * PARAMETERS: Signature - ACPI signature of needed table 458 * Instance - Which instance (for SSDTs) 459 * OutTable - Where the pointer to the table is returned 460 * 461 * RETURN: Status and pointer to the requested table 462 * 463 * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the 464 * RSDT/XSDT. 465 * Note that an early stage AcpiGetTable() call must be paired 466 * with an early stage AcpiPutTable() call. otherwise the table 467 * pointer mapped by the early stage mapping implementation may be 468 * erroneously unmapped by the late stage unmapping implementation 469 * in an AcpiPutTable() invoked during the late stage. 470 * 471 ******************************************************************************/ 472 473 ACPI_STATUS 474 AcpiGetTable ( 475 char *Signature, 476 UINT32 Instance, 477 ACPI_TABLE_HEADER **OutTable) 478 { 479 UINT32 i; 480 UINT32 j; 481 ACPI_STATUS Status = AE_NOT_FOUND; 482 ACPI_TABLE_DESC *TableDesc; 483 484 485 /* Parameter validation */ 486 487 if (!Signature || !OutTable) 488 { 489 return (AE_BAD_PARAMETER); 490 } 491 492 /* 493 * Note that the following line is required by some OSPMs, they only 494 * check if the returned table is NULL instead of the returned status 495 * to determined if this function is succeeded. 496 */ 497 *OutTable = NULL; 498 499 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES); 500 501 /* Walk the root table list */ 502 503 for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++) 504 { 505 TableDesc = &AcpiGbl_RootTableList.Tables[i]; 506 507 if (!ACPI_COMPARE_NAME (&TableDesc->Signature, Signature)) 508 { 509 continue; 510 } 511 512 if (++j < Instance) 513 { 514 continue; 515 } 516 517 Status = AcpiTbGetTable (TableDesc, OutTable); 518 break; 519 } 520 521 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES); 522 return (Status); 523 } 524 525 ACPI_EXPORT_SYMBOL (AcpiGetTable) 526 527 528 /******************************************************************************* 529 * 530 * FUNCTION: AcpiPutTable 531 * 532 * PARAMETERS: Table - The pointer to the table 533 * 534 * RETURN: None 535 * 536 * DESCRIPTION: Release a table returned by AcpiGetTable() and its clones. 537 * Note that it is not safe if this function was invoked after an 538 * uninstallation happened to the original table descriptor. 539 * Currently there is no OSPMs' requirement to handle such 540 * situations. 541 * 542 ******************************************************************************/ 543 544 void 545 AcpiPutTable ( 546 ACPI_TABLE_HEADER *Table) 547 { 548 UINT32 i; 549 ACPI_TABLE_DESC *TableDesc; 550 551 552 ACPI_FUNCTION_TRACE (AcpiPutTable); 553 554 555 if (!Table) 556 { 557 return_VOID; 558 } 559 560 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES); 561 562 /* Walk the root table list */ 563 564 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++) 565 { 566 TableDesc = &AcpiGbl_RootTableList.Tables[i]; 567 568 if (TableDesc->Pointer != Table) 569 { 570 continue; 571 } 572 573 AcpiTbPutTable (TableDesc); 574 break; 575 } 576 577 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES); 578 return_VOID; 579 } 580 581 ACPI_EXPORT_SYMBOL (AcpiPutTable) 582 583 584 /******************************************************************************* 585 * 586 * FUNCTION: AcpiGetTableByIndex 587 * 588 * PARAMETERS: TableIndex - Table index 589 * OutTable - Where the pointer to the table is returned 590 * 591 * RETURN: Status and pointer to the requested table 592 * 593 * DESCRIPTION: Obtain a table by an index into the global table list. Used 594 * internally also. 595 * 596 ******************************************************************************/ 597 598 ACPI_STATUS 599 AcpiGetTableByIndex ( 600 UINT32 TableIndex, 601 ACPI_TABLE_HEADER **OutTable) 602 { 603 ACPI_STATUS Status; 604 605 606 ACPI_FUNCTION_TRACE (AcpiGetTableByIndex); 607 608 609 /* Parameter validation */ 610 611 if (!OutTable) 612 { 613 return_ACPI_STATUS (AE_BAD_PARAMETER); 614 } 615 616 /* 617 * Note that the following line is required by some OSPMs, they only 618 * check if the returned table is NULL instead of the returned status 619 * to determined if this function is succeeded. 620 */ 621 *OutTable = NULL; 622 623 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES); 624 625 /* Validate index */ 626 627 if (TableIndex >= AcpiGbl_RootTableList.CurrentTableCount) 628 { 629 Status = AE_BAD_PARAMETER; 630 goto UnlockAndExit; 631 } 632 633 Status = AcpiTbGetTable ( 634 &AcpiGbl_RootTableList.Tables[TableIndex], OutTable); 635 636 UnlockAndExit: 637 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES); 638 return_ACPI_STATUS (Status); 639 } 640 641 ACPI_EXPORT_SYMBOL (AcpiGetTableByIndex) 642 643 644 /******************************************************************************* 645 * 646 * FUNCTION: AcpiInstallTableHandler 647 * 648 * PARAMETERS: Handler - Table event handler 649 * Context - Value passed to the handler on each event 650 * 651 * RETURN: Status 652 * 653 * DESCRIPTION: Install a global table event handler. 654 * 655 ******************************************************************************/ 656 657 ACPI_STATUS 658 AcpiInstallTableHandler ( 659 ACPI_TABLE_HANDLER Handler, 660 void *Context) 661 { 662 ACPI_STATUS Status; 663 664 665 ACPI_FUNCTION_TRACE (AcpiInstallTableHandler); 666 667 668 if (!Handler) 669 { 670 return_ACPI_STATUS (AE_BAD_PARAMETER); 671 } 672 673 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 674 if (ACPI_FAILURE (Status)) 675 { 676 return_ACPI_STATUS (Status); 677 } 678 679 /* Don't allow more than one handler */ 680 681 if (AcpiGbl_TableHandler) 682 { 683 Status = AE_ALREADY_EXISTS; 684 goto Cleanup; 685 } 686 687 /* Install the handler */ 688 689 AcpiGbl_TableHandler = Handler; 690 AcpiGbl_TableHandlerContext = Context; 691 692 Cleanup: 693 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 694 return_ACPI_STATUS (Status); 695 } 696 697 ACPI_EXPORT_SYMBOL (AcpiInstallTableHandler) 698 699 700 /******************************************************************************* 701 * 702 * FUNCTION: AcpiRemoveTableHandler 703 * 704 * PARAMETERS: Handler - Table event handler that was installed 705 * previously. 706 * 707 * RETURN: Status 708 * 709 * DESCRIPTION: Remove a table event handler 710 * 711 ******************************************************************************/ 712 713 ACPI_STATUS 714 AcpiRemoveTableHandler ( 715 ACPI_TABLE_HANDLER Handler) 716 { 717 ACPI_STATUS Status; 718 719 720 ACPI_FUNCTION_TRACE (AcpiRemoveTableHandler); 721 722 723 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 724 if (ACPI_FAILURE (Status)) 725 { 726 return_ACPI_STATUS (Status); 727 } 728 729 /* Make sure that the installed handler is the same */ 730 731 if (!Handler || 732 Handler != AcpiGbl_TableHandler) 733 { 734 Status = AE_BAD_PARAMETER; 735 goto Cleanup; 736 } 737 738 /* Remove the handler */ 739 740 AcpiGbl_TableHandler = NULL; 741 742 Cleanup: 743 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 744 return_ACPI_STATUS (Status); 745 } 746 747 ACPI_EXPORT_SYMBOL (AcpiRemoveTableHandler) 748