1 /****************************************************************************** 2 * 3 * Module Name: evrgnini- ACPI AddressSpace (OpRegion) init 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 #include "acpi.h" 153 #include "accommon.h" 154 #include "acevents.h" 155 #include "acnamesp.h" 156 #include "acinterp.h" 157 158 #define _COMPONENT ACPI_EVENTS 159 ACPI_MODULE_NAME ("evrgnini") 160 161 /* Local prototypes */ 162 163 static BOOLEAN 164 AcpiEvIsPciRootBridge ( 165 ACPI_NAMESPACE_NODE *Node); 166 167 168 /******************************************************************************* 169 * 170 * FUNCTION: AcpiEvSystemMemoryRegionSetup 171 * 172 * PARAMETERS: Handle - Region we are interested in 173 * Function - Start or stop 174 * HandlerContext - Address space handler context 175 * RegionContext - Region specific context 176 * 177 * RETURN: Status 178 * 179 * DESCRIPTION: Setup a SystemMemory operation region 180 * 181 ******************************************************************************/ 182 183 ACPI_STATUS 184 AcpiEvSystemMemoryRegionSetup ( 185 ACPI_HANDLE Handle, 186 UINT32 Function, 187 void *HandlerContext, 188 void **RegionContext) 189 { 190 ACPI_OPERAND_OBJECT *RegionDesc = (ACPI_OPERAND_OBJECT *) Handle; 191 ACPI_MEM_SPACE_CONTEXT *LocalRegionContext; 192 193 194 ACPI_FUNCTION_TRACE (EvSystemMemoryRegionSetup); 195 196 197 if (Function == ACPI_REGION_DEACTIVATE) 198 { 199 if (*RegionContext) 200 { 201 LocalRegionContext = (ACPI_MEM_SPACE_CONTEXT *) *RegionContext; 202 203 /* Delete a cached mapping if present */ 204 205 if (LocalRegionContext->MappedLength) 206 { 207 AcpiOsUnmapMemory (LocalRegionContext->MappedLogicalAddress, 208 LocalRegionContext->MappedLength); 209 } 210 ACPI_FREE (LocalRegionContext); 211 *RegionContext = NULL; 212 } 213 return_ACPI_STATUS (AE_OK); 214 } 215 216 /* Create a new context */ 217 218 LocalRegionContext = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_MEM_SPACE_CONTEXT)); 219 if (!(LocalRegionContext)) 220 { 221 return_ACPI_STATUS (AE_NO_MEMORY); 222 } 223 224 /* Save the region length and address for use in the handler */ 225 226 LocalRegionContext->Length = RegionDesc->Region.Length; 227 LocalRegionContext->Address = RegionDesc->Region.Address; 228 229 *RegionContext = LocalRegionContext; 230 return_ACPI_STATUS (AE_OK); 231 } 232 233 234 /******************************************************************************* 235 * 236 * FUNCTION: AcpiEvIoSpaceRegionSetup 237 * 238 * PARAMETERS: Handle - Region we are interested in 239 * Function - Start or stop 240 * HandlerContext - Address space handler context 241 * RegionContext - Region specific context 242 * 243 * RETURN: Status 244 * 245 * DESCRIPTION: Setup a IO operation region 246 * 247 ******************************************************************************/ 248 249 ACPI_STATUS 250 AcpiEvIoSpaceRegionSetup ( 251 ACPI_HANDLE Handle, 252 UINT32 Function, 253 void *HandlerContext, 254 void **RegionContext) 255 { 256 ACPI_FUNCTION_TRACE (EvIoSpaceRegionSetup); 257 258 259 if (Function == ACPI_REGION_DEACTIVATE) 260 { 261 *RegionContext = NULL; 262 } 263 else 264 { 265 *RegionContext = HandlerContext; 266 } 267 268 return_ACPI_STATUS (AE_OK); 269 } 270 271 272 /******************************************************************************* 273 * 274 * FUNCTION: AcpiEvPciConfigRegionSetup 275 * 276 * PARAMETERS: Handle - Region we are interested in 277 * Function - Start or stop 278 * HandlerContext - Address space handler context 279 * RegionContext - Region specific context 280 * 281 * RETURN: Status 282 * 283 * DESCRIPTION: Setup a PCI_Config operation region 284 * 285 * MUTEX: Assumes namespace is not locked 286 * 287 ******************************************************************************/ 288 289 ACPI_STATUS 290 AcpiEvPciConfigRegionSetup ( 291 ACPI_HANDLE Handle, 292 UINT32 Function, 293 void *HandlerContext, 294 void **RegionContext) 295 { 296 ACPI_STATUS Status = AE_OK; 297 UINT64 PciValue; 298 ACPI_PCI_ID *PciId = *RegionContext; 299 ACPI_OPERAND_OBJECT *HandlerObj; 300 ACPI_NAMESPACE_NODE *ParentNode; 301 ACPI_NAMESPACE_NODE *PciRootNode; 302 ACPI_NAMESPACE_NODE *PciDeviceNode; 303 ACPI_OPERAND_OBJECT *RegionObj = (ACPI_OPERAND_OBJECT *) Handle; 304 305 306 ACPI_FUNCTION_TRACE (EvPciConfigRegionSetup); 307 308 309 HandlerObj = RegionObj->Region.Handler; 310 if (!HandlerObj) 311 { 312 /* 313 * No installed handler. This shouldn't happen because the dispatch 314 * routine checks before we get here, but we check again just in case. 315 */ 316 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, 317 "Attempting to init a region %p, with no handler\n", RegionObj)); 318 return_ACPI_STATUS (AE_NOT_EXIST); 319 } 320 321 *RegionContext = NULL; 322 if (Function == ACPI_REGION_DEACTIVATE) 323 { 324 if (PciId) 325 { 326 ACPI_FREE (PciId); 327 } 328 return_ACPI_STATUS (Status); 329 } 330 331 ParentNode = RegionObj->Region.Node->Parent; 332 333 /* 334 * Get the _SEG and _BBN values from the device upon which the handler 335 * is installed. 336 * 337 * We need to get the _SEG and _BBN objects relative to the PCI BUS device. 338 * This is the device the handler has been registered to handle. 339 */ 340 341 /* 342 * If the AddressSpace.Node is still pointing to the root, we need 343 * to scan upward for a PCI Root bridge and re-associate the OpRegion 344 * handlers with that device. 345 */ 346 if (HandlerObj->AddressSpace.Node == AcpiGbl_RootNode) 347 { 348 /* Start search from the parent object */ 349 350 PciRootNode = ParentNode; 351 while (PciRootNode != AcpiGbl_RootNode) 352 { 353 /* Get the _HID/_CID in order to detect a RootBridge */ 354 355 if (AcpiEvIsPciRootBridge (PciRootNode)) 356 { 357 /* Install a handler for this PCI root bridge */ 358 359 Status = AcpiInstallAddressSpaceHandler ( 360 (ACPI_HANDLE) PciRootNode, 361 ACPI_ADR_SPACE_PCI_CONFIG, 362 ACPI_DEFAULT_HANDLER, NULL, NULL); 363 if (ACPI_FAILURE (Status)) 364 { 365 if (Status == AE_SAME_HANDLER) 366 { 367 /* 368 * It is OK if the handler is already installed on the 369 * root bridge. Still need to return a context object 370 * for the new PCI_Config operation region, however. 371 */ 372 Status = AE_OK; 373 } 374 else 375 { 376 ACPI_EXCEPTION ((AE_INFO, Status, 377 "Could not install PciConfig handler " 378 "for Root Bridge %4.4s", 379 AcpiUtGetNodeName (PciRootNode))); 380 } 381 } 382 break; 383 } 384 385 PciRootNode = PciRootNode->Parent; 386 } 387 388 /* PCI root bridge not found, use namespace root node */ 389 } 390 else 391 { 392 PciRootNode = HandlerObj->AddressSpace.Node; 393 } 394 395 /* 396 * If this region is now initialized, we are done. 397 * (InstallAddressSpaceHandler could have initialized it) 398 */ 399 if (RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE) 400 { 401 return_ACPI_STATUS (AE_OK); 402 } 403 404 /* Region is still not initialized. Create a new context */ 405 406 PciId = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_PCI_ID)); 407 if (!PciId) 408 { 409 return_ACPI_STATUS (AE_NO_MEMORY); 410 } 411 412 /* 413 * For PCI_Config space access, we need the segment, bus, device and 414 * function numbers. Acquire them here. 415 * 416 * Find the parent device object. (This allows the operation region to be 417 * within a subscope under the device, such as a control method.) 418 */ 419 PciDeviceNode = RegionObj->Region.Node; 420 while (PciDeviceNode && (PciDeviceNode->Type != ACPI_TYPE_DEVICE)) 421 { 422 PciDeviceNode = PciDeviceNode->Parent; 423 } 424 425 if (!PciDeviceNode) 426 { 427 ACPI_FREE (PciId); 428 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 429 } 430 431 /* 432 * Get the PCI device and function numbers from the _ADR object 433 * contained in the parent's scope. 434 */ 435 Status = AcpiUtEvaluateNumericObject (METHOD_NAME__ADR, 436 PciDeviceNode, &PciValue); 437 438 /* 439 * The default is zero, and since the allocation above zeroed the data, 440 * just do nothing on failure. 441 */ 442 if (ACPI_SUCCESS (Status)) 443 { 444 PciId->Device = ACPI_HIWORD (ACPI_LODWORD (PciValue)); 445 PciId->Function = ACPI_LOWORD (ACPI_LODWORD (PciValue)); 446 } 447 448 /* The PCI segment number comes from the _SEG method */ 449 450 Status = AcpiUtEvaluateNumericObject (METHOD_NAME__SEG, 451 PciRootNode, &PciValue); 452 if (ACPI_SUCCESS (Status)) 453 { 454 PciId->Segment = ACPI_LOWORD (PciValue); 455 } 456 457 /* The PCI bus number comes from the _BBN method */ 458 459 Status = AcpiUtEvaluateNumericObject (METHOD_NAME__BBN, 460 PciRootNode, &PciValue); 461 if (ACPI_SUCCESS (Status)) 462 { 463 PciId->Bus = ACPI_LOWORD (PciValue); 464 } 465 466 /* Complete/update the PCI ID for this device */ 467 468 Status = AcpiHwDerivePciId (PciId, PciRootNode, RegionObj->Region.Node); 469 if (ACPI_FAILURE (Status)) 470 { 471 ACPI_FREE (PciId); 472 return_ACPI_STATUS (Status); 473 } 474 475 *RegionContext = PciId; 476 return_ACPI_STATUS (AE_OK); 477 } 478 479 480 /******************************************************************************* 481 * 482 * FUNCTION: AcpiEvIsPciRootBridge 483 * 484 * PARAMETERS: Node - Device node being examined 485 * 486 * RETURN: TRUE if device is a PCI/PCI-Express Root Bridge 487 * 488 * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by 489 * examining the _HID and _CID for the device. 490 * 491 ******************************************************************************/ 492 493 static BOOLEAN 494 AcpiEvIsPciRootBridge ( 495 ACPI_NAMESPACE_NODE *Node) 496 { 497 ACPI_STATUS Status; 498 ACPI_PNP_DEVICE_ID *Hid; 499 ACPI_PNP_DEVICE_ID_LIST *Cid; 500 UINT32 i; 501 BOOLEAN Match; 502 503 504 /* Get the _HID and check for a PCI Root Bridge */ 505 506 Status = AcpiUtExecute_HID (Node, &Hid); 507 if (ACPI_FAILURE (Status)) 508 { 509 return (FALSE); 510 } 511 512 Match = AcpiUtIsPciRootBridge (Hid->String); 513 ACPI_FREE (Hid); 514 515 if (Match) 516 { 517 return (TRUE); 518 } 519 520 /* The _HID did not match. Get the _CID and check for a PCI Root Bridge */ 521 522 Status = AcpiUtExecute_CID (Node, &Cid); 523 if (ACPI_FAILURE (Status)) 524 { 525 return (FALSE); 526 } 527 528 /* Check all _CIDs in the returned list */ 529 530 for (i = 0; i < Cid->Count; i++) 531 { 532 if (AcpiUtIsPciRootBridge (Cid->Ids[i].String)) 533 { 534 ACPI_FREE (Cid); 535 return (TRUE); 536 } 537 } 538 539 ACPI_FREE (Cid); 540 return (FALSE); 541 } 542 543 544 /******************************************************************************* 545 * 546 * FUNCTION: AcpiEvPciBarRegionSetup 547 * 548 * PARAMETERS: Handle - Region we are interested in 549 * Function - Start or stop 550 * HandlerContext - Address space handler context 551 * RegionContext - Region specific context 552 * 553 * RETURN: Status 554 * 555 * DESCRIPTION: Setup a PciBAR operation region 556 * 557 * MUTEX: Assumes namespace is not locked 558 * 559 ******************************************************************************/ 560 561 ACPI_STATUS 562 AcpiEvPciBarRegionSetup ( 563 ACPI_HANDLE Handle, 564 UINT32 Function, 565 void *HandlerContext, 566 void **RegionContext) 567 { 568 ACPI_FUNCTION_TRACE (EvPciBarRegionSetup); 569 570 571 return_ACPI_STATUS (AE_OK); 572 } 573 574 575 /******************************************************************************* 576 * 577 * FUNCTION: AcpiEvCmosRegionSetup 578 * 579 * PARAMETERS: Handle - Region we are interested in 580 * Function - Start or stop 581 * HandlerContext - Address space handler context 582 * RegionContext - Region specific context 583 * 584 * RETURN: Status 585 * 586 * DESCRIPTION: Setup a CMOS operation region 587 * 588 * MUTEX: Assumes namespace is not locked 589 * 590 ******************************************************************************/ 591 592 ACPI_STATUS 593 AcpiEvCmosRegionSetup ( 594 ACPI_HANDLE Handle, 595 UINT32 Function, 596 void *HandlerContext, 597 void **RegionContext) 598 { 599 ACPI_FUNCTION_TRACE (EvCmosRegionSetup); 600 601 602 return_ACPI_STATUS (AE_OK); 603 } 604 605 606 /******************************************************************************* 607 * 608 * FUNCTION: AcpiEvDefaultRegionSetup 609 * 610 * PARAMETERS: Handle - Region we are interested in 611 * Function - Start or stop 612 * HandlerContext - Address space handler context 613 * RegionContext - Region specific context 614 * 615 * RETURN: Status 616 * 617 * DESCRIPTION: Default region initialization 618 * 619 ******************************************************************************/ 620 621 ACPI_STATUS 622 AcpiEvDefaultRegionSetup ( 623 ACPI_HANDLE Handle, 624 UINT32 Function, 625 void *HandlerContext, 626 void **RegionContext) 627 { 628 ACPI_FUNCTION_TRACE (EvDefaultRegionSetup); 629 630 631 if (Function == ACPI_REGION_DEACTIVATE) 632 { 633 *RegionContext = NULL; 634 } 635 else 636 { 637 *RegionContext = HandlerContext; 638 } 639 640 return_ACPI_STATUS (AE_OK); 641 } 642 643 644 /******************************************************************************* 645 * 646 * FUNCTION: AcpiEvInitializeRegion 647 * 648 * PARAMETERS: RegionObj - Region we are initializing 649 * 650 * RETURN: Status 651 * 652 * DESCRIPTION: Initializes the region, finds any _REG methods and saves them 653 * for execution at a later time 654 * 655 * Get the appropriate address space handler for a newly 656 * created region. 657 * 658 * This also performs address space specific initialization. For 659 * example, PCI regions must have an _ADR object that contains 660 * a PCI address in the scope of the definition. This address is 661 * required to perform an access to PCI config space. 662 * 663 * MUTEX: Interpreter should be unlocked, because we may run the _REG 664 * method for this region. 665 * 666 * NOTE: Possible incompliance: 667 * There is a behavior conflict in automatic _REG execution: 668 * 1. When the interpreter is evaluating a method, we can only 669 * automatically run _REG for the following case: 670 * Method(_REG, 2) {} 671 * OperationRegion (OPR1, 0x80, 0x1000010, 0x4) 672 * 2. When the interpreter is loading a table, we can also 673 * automatically run _REG for the following case: 674 * OperationRegion (OPR1, 0x80, 0x1000010, 0x4) 675 * Method(_REG, 2) {} 676 * Though this may not be compliant to the de-facto standard, the 677 * logic is kept in order not to trigger regressions. And keeping 678 * this logic should be taken care by the caller of this function. 679 * 680 ******************************************************************************/ 681 682 ACPI_STATUS 683 AcpiEvInitializeRegion ( 684 ACPI_OPERAND_OBJECT *RegionObj) 685 { 686 ACPI_OPERAND_OBJECT *HandlerObj; 687 ACPI_OPERAND_OBJECT *ObjDesc; 688 ACPI_ADR_SPACE_TYPE SpaceId; 689 ACPI_NAMESPACE_NODE *Node; 690 691 692 ACPI_FUNCTION_TRACE (EvInitializeRegion); 693 694 695 if (!RegionObj) 696 { 697 return_ACPI_STATUS (AE_BAD_PARAMETER); 698 } 699 700 if (RegionObj->Common.Flags & AOPOBJ_OBJECT_INITIALIZED) 701 { 702 return_ACPI_STATUS (AE_OK); 703 } 704 705 RegionObj->Common.Flags |= AOPOBJ_OBJECT_INITIALIZED; 706 707 Node = RegionObj->Region.Node->Parent; 708 SpaceId = RegionObj->Region.SpaceId; 709 710 /* 711 * The following loop depends upon the root Node having no parent 712 * ie: AcpiGbl_RootNode->Parent being set to NULL 713 */ 714 while (Node) 715 { 716 /* Check to see if a handler exists */ 717 718 HandlerObj = NULL; 719 ObjDesc = AcpiNsGetAttachedObject (Node); 720 if (ObjDesc) 721 { 722 /* Can only be a handler if the object exists */ 723 724 switch (Node->Type) 725 { 726 case ACPI_TYPE_DEVICE: 727 case ACPI_TYPE_PROCESSOR: 728 case ACPI_TYPE_THERMAL: 729 730 HandlerObj = ObjDesc->CommonNotify.Handler; 731 break; 732 733 case ACPI_TYPE_METHOD: 734 /* 735 * If we are executing module level code, the original 736 * Node's object was replaced by this Method object and we 737 * saved the handler in the method object. 738 * 739 * Note: Only used for the legacy MLC support. Will 740 * be removed in the future. 741 * 742 * See AcpiNsExecModuleCode 743 */ 744 if (!AcpiGbl_ExecuteTablesAsMethods && 745 ObjDesc->Method.InfoFlags & ACPI_METHOD_MODULE_LEVEL) 746 { 747 HandlerObj = ObjDesc->Method.Dispatch.Handler; 748 } 749 break; 750 751 default: 752 753 /* Ignore other objects */ 754 755 break; 756 } 757 758 HandlerObj = AcpiEvFindRegionHandler (SpaceId, HandlerObj); 759 if (HandlerObj) 760 { 761 /* Found correct handler */ 762 763 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, 764 "Found handler %p for region %p in obj %p\n", 765 HandlerObj, RegionObj, ObjDesc)); 766 767 (void) AcpiEvAttachRegion (HandlerObj, RegionObj, FALSE); 768 769 /* 770 * Tell all users that this region is usable by 771 * running the _REG method 772 */ 773 AcpiExExitInterpreter (); 774 (void) AcpiEvExecuteRegMethod (RegionObj, ACPI_REG_CONNECT); 775 AcpiExEnterInterpreter (); 776 return_ACPI_STATUS (AE_OK); 777 } 778 } 779 780 /* This node does not have the handler we need; Pop up one level */ 781 782 Node = Node->Parent; 783 } 784 785 /* 786 * If we get here, there is no handler for this region. This is not 787 * fatal because many regions get created before a handler is installed 788 * for said region. 789 */ 790 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, 791 "No handler for RegionType %s(%X) (RegionObj %p)\n", 792 AcpiUtGetRegionName (SpaceId), SpaceId, RegionObj)); 793 794 return_ACPI_STATUS (AE_OK); 795 } 796