1 /****************************************************************************** 2 * 3 * Module Name: dspkginit - Completion of deferred package initialization 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2022, 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 <contrib/dev/acpica/include/acpi.h> 153 #include <contrib/dev/acpica/include/accommon.h> 154 #include <contrib/dev/acpica/include/acnamesp.h> 155 #include <contrib/dev/acpica/include/amlcode.h> 156 #include <contrib/dev/acpica/include/acdispat.h> 157 #include <contrib/dev/acpica/include/acinterp.h> 158 #include <contrib/dev/acpica/include/acparser.h> 159 160 161 #define _COMPONENT ACPI_NAMESPACE 162 ACPI_MODULE_NAME ("dspkginit") 163 164 165 /* Local prototypes */ 166 167 static void 168 AcpiDsResolvePackageElement ( 169 ACPI_OPERAND_OBJECT **Element); 170 171 172 /******************************************************************************* 173 * 174 * FUNCTION: AcpiDsBuildInternalPackageObj 175 * 176 * PARAMETERS: WalkState - Current walk state 177 * Op - Parser object to be translated 178 * ElementCount - Number of elements in the package - this is 179 * the NumElements argument to Package() 180 * ObjDescPtr - Where the ACPI internal object is returned 181 * 182 * RETURN: Status 183 * 184 * DESCRIPTION: Translate a parser Op package object to the equivalent 185 * namespace object 186 * 187 * NOTE: The number of elements in the package will be always be the NumElements 188 * count, regardless of the number of elements in the package list. If 189 * NumElements is smaller, only that many package list elements are used. 190 * if NumElements is larger, the Package object is padded out with 191 * objects of type Uninitialized (as per ACPI spec.) 192 * 193 * Even though the ASL compilers do not allow NumElements to be smaller 194 * than the Package list length (for the fixed length package opcode), some 195 * BIOS code modifies the AML on the fly to adjust the NumElements, and 196 * this code compensates for that. This also provides compatibility with 197 * other AML interpreters. 198 * 199 ******************************************************************************/ 200 201 ACPI_STATUS 202 AcpiDsBuildInternalPackageObj ( 203 ACPI_WALK_STATE *WalkState, 204 ACPI_PARSE_OBJECT *Op, 205 UINT32 ElementCount, 206 ACPI_OPERAND_OBJECT **ObjDescPtr) 207 { 208 ACPI_PARSE_OBJECT *Arg; 209 ACPI_PARSE_OBJECT *Parent; 210 ACPI_OPERAND_OBJECT *ObjDesc = NULL; 211 ACPI_STATUS Status = AE_OK; 212 BOOLEAN ModuleLevelCode = FALSE; 213 UINT16 ReferenceCount; 214 UINT32 Index; 215 UINT32 i; 216 217 218 ACPI_FUNCTION_TRACE (DsBuildInternalPackageObj); 219 220 221 /* Check if we are executing module level code */ 222 223 if (WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL) 224 { 225 ModuleLevelCode = TRUE; 226 } 227 228 /* Find the parent of a possibly nested package */ 229 230 Parent = Op->Common.Parent; 231 while ((Parent->Common.AmlOpcode == AML_PACKAGE_OP) || 232 (Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP)) 233 { 234 Parent = Parent->Common.Parent; 235 } 236 237 /* 238 * If we are evaluating a Named package object of the form: 239 * Name (xxxx, Package) 240 * the package object already exists, otherwise it must be created. 241 */ 242 ObjDesc = *ObjDescPtr; 243 if (!ObjDesc) 244 { 245 ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_PACKAGE); 246 *ObjDescPtr = ObjDesc; 247 if (!ObjDesc) 248 { 249 return_ACPI_STATUS (AE_NO_MEMORY); 250 } 251 252 ObjDesc->Package.Node = Parent->Common.Node; 253 } 254 255 if (ObjDesc->Package.Flags & AOPOBJ_DATA_VALID) /* Just in case */ 256 { 257 return_ACPI_STATUS (AE_OK); 258 } 259 260 /* 261 * Allocate the element array (array of pointers to the individual 262 * objects) if necessary. the count is based on the NumElements 263 * parameter. Add an extra pointer slot so that the list is always 264 * null terminated. 265 */ 266 if (!ObjDesc->Package.Elements) 267 { 268 ObjDesc->Package.Elements = ACPI_ALLOCATE_ZEROED ( 269 ((ACPI_SIZE) ElementCount + 1) * sizeof (void *)); 270 271 if (!ObjDesc->Package.Elements) 272 { 273 AcpiUtDeleteObjectDesc (ObjDesc); 274 return_ACPI_STATUS (AE_NO_MEMORY); 275 } 276 277 ObjDesc->Package.Count = ElementCount; 278 } 279 280 /* First arg is element count. Second arg begins the initializer list */ 281 282 Arg = Op->Common.Value.Arg; 283 Arg = Arg->Common.Next; 284 285 /* 286 * If we are executing module-level code, we will defer the 287 * full resolution of the package elements in order to support 288 * forward references from the elements. This provides 289 * compatibility with other ACPI implementations. 290 */ 291 if (ModuleLevelCode) 292 { 293 ObjDesc->Package.AmlStart = WalkState->Aml; 294 ObjDesc->Package.AmlLength = 0; 295 296 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_PARSE, 297 "%s: Deferring resolution of Package elements\n", 298 ACPI_GET_FUNCTION_NAME)); 299 } 300 301 /* 302 * Initialize the elements of the package, up to the NumElements count. 303 * Package is automatically padded with uninitialized (NULL) elements 304 * if NumElements is greater than the package list length. Likewise, 305 * Package is truncated if NumElements is less than the list length. 306 */ 307 for (i = 0; Arg && (i < ElementCount); i++) 308 { 309 if (Arg->Common.AmlOpcode == AML_INT_RETURN_VALUE_OP) 310 { 311 if (!Arg->Common.Node) 312 { 313 /* 314 * This is the case where an expression has returned a value. 315 * The use of expressions (TermArgs) within individual 316 * package elements is not supported by the AML interpreter, 317 * even though the ASL grammar supports it. Example: 318 * 319 * Name (INT1, 0x1234) 320 * 321 * Name (PKG3, Package () { 322 * Add (INT1, 0xAAAA0000) 323 * }) 324 * 325 * 1) No known AML interpreter supports this type of construct 326 * 2) This fixes a fault if the construct is encountered 327 */ 328 ACPI_EXCEPTION ((AE_INFO, AE_SUPPORT, 329 "Expressions within package elements are not supported")); 330 331 /* Cleanup the return object, it is not needed */ 332 333 AcpiUtRemoveReference (WalkState->Results->Results.ObjDesc[0]); 334 return_ACPI_STATUS (AE_SUPPORT); 335 } 336 337 if (Arg->Common.Node->Type == ACPI_TYPE_METHOD) 338 { 339 /* 340 * A method reference "looks" to the parser to be a method 341 * invocation, so we special case it here 342 */ 343 Arg->Common.AmlOpcode = AML_INT_NAMEPATH_OP; 344 Status = AcpiDsBuildInternalObject ( 345 WalkState, Arg, &ObjDesc->Package.Elements[i]); 346 } 347 else 348 { 349 /* This package element is already built, just get it */ 350 351 ObjDesc->Package.Elements[i] = 352 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Arg->Common.Node); 353 } 354 } 355 else 356 { 357 Status = AcpiDsBuildInternalObject ( 358 WalkState, Arg, &ObjDesc->Package.Elements[i]); 359 if (Status == AE_NOT_FOUND) 360 { 361 ACPI_ERROR ((AE_INFO, "%-48s", "****DS namepath not found")); 362 } 363 364 if (!ModuleLevelCode) 365 { 366 /* 367 * Initialize this package element. This function handles the 368 * resolution of named references within the package. 369 * Forward references from module-level code are deferred 370 * until all ACPI tables are loaded. 371 */ 372 AcpiDsInitPackageElement (0, ObjDesc->Package.Elements[i], 373 NULL, &ObjDesc->Package.Elements[i]); 374 } 375 } 376 377 if (*ObjDescPtr) 378 { 379 /* Existing package, get existing reference count */ 380 381 ReferenceCount = (*ObjDescPtr)->Common.ReferenceCount; 382 if (ReferenceCount > 1) 383 { 384 /* Make new element ref count match original ref count */ 385 /* TBD: Probably need an AcpiUtAddReferences function */ 386 387 for (Index = 0; Index < ((UINT32) ReferenceCount - 1); Index++) 388 { 389 AcpiUtAddReference ((ObjDesc->Package.Elements[i])); 390 } 391 } 392 } 393 394 Arg = Arg->Common.Next; 395 } 396 397 /* Check for match between NumElements and actual length of PackageList */ 398 399 if (Arg) 400 { 401 /* 402 * NumElements was exhausted, but there are remaining elements in 403 * the PackageList. Truncate the package to NumElements. 404 * 405 * Note: technically, this is an error, from ACPI spec: "It is an 406 * error for NumElements to be less than the number of elements in 407 * the PackageList". However, we just print a message and no 408 * exception is returned. This provides compatibility with other 409 * ACPI implementations. Some firmware implementations will alter 410 * the NumElements on the fly, possibly creating this type of 411 * ill-formed package object. 412 */ 413 while (Arg) 414 { 415 /* 416 * We must delete any package elements that were created earlier 417 * and are not going to be used because of the package truncation. 418 */ 419 if (Arg->Common.Node) 420 { 421 AcpiUtRemoveReference ( 422 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Arg->Common.Node)); 423 Arg->Common.Node = NULL; 424 } 425 426 /* Find out how many elements there really are */ 427 428 i++; 429 Arg = Arg->Common.Next; 430 } 431 432 ACPI_INFO (( 433 "Actual Package length (%u) is larger than " 434 "NumElements field (%u), truncated", 435 i, ElementCount)); 436 } 437 else if (i < ElementCount) 438 { 439 /* 440 * Arg list (elements) was exhausted, but we did not reach 441 * NumElements count. 442 * 443 * Note: this is not an error, the package is padded out 444 * with NULLs as per the ACPI specification. 445 */ 446 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO, 447 "%s: Package List length (%u) smaller than NumElements " 448 "count (%u), padded with null elements\n", 449 ACPI_GET_FUNCTION_NAME, i, ElementCount)); 450 } 451 452 /* Module-level packages will be resolved later */ 453 454 if (!ModuleLevelCode) 455 { 456 ObjDesc->Package.Flags |= AOPOBJ_DATA_VALID; 457 } 458 459 Op->Common.Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjDesc); 460 return_ACPI_STATUS (Status); 461 } 462 463 464 /******************************************************************************* 465 * 466 * FUNCTION: AcpiDsInitPackageElement 467 * 468 * PARAMETERS: ACPI_PKG_CALLBACK 469 * 470 * RETURN: Status 471 * 472 * DESCRIPTION: Resolve a named reference element within a package object 473 * 474 ******************************************************************************/ 475 476 ACPI_STATUS 477 AcpiDsInitPackageElement ( 478 UINT8 ObjectType, 479 ACPI_OPERAND_OBJECT *SourceObject, 480 ACPI_GENERIC_STATE *State, 481 void *Context) 482 { 483 ACPI_OPERAND_OBJECT **ElementPtr; 484 485 486 ACPI_FUNCTION_TRACE (DsInitPackageElement); 487 488 489 if (!SourceObject) 490 { 491 return_ACPI_STATUS (AE_OK); 492 } 493 494 /* 495 * The following code is a bit of a hack to workaround a (current) 496 * limitation of the ACPI_PKG_CALLBACK interface. We need a pointer 497 * to the location within the element array because a new object 498 * may be created and stored there. 499 */ 500 if (Context) 501 { 502 /* A direct call was made to this function */ 503 504 ElementPtr = (ACPI_OPERAND_OBJECT **) Context; 505 } 506 else 507 { 508 /* Call came from AcpiUtWalkPackageTree */ 509 510 ElementPtr = State->Pkg.ThisTargetObj; 511 } 512 513 /* We are only interested in reference objects/elements */ 514 515 if (SourceObject->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) 516 { 517 /* Attempt to resolve the (named) reference to a namespace node */ 518 519 AcpiDsResolvePackageElement (ElementPtr); 520 } 521 else if (SourceObject->Common.Type == ACPI_TYPE_PACKAGE) 522 { 523 SourceObject->Package.Flags |= AOPOBJ_DATA_VALID; 524 } 525 526 return_ACPI_STATUS (AE_OK); 527 } 528 529 530 /******************************************************************************* 531 * 532 * FUNCTION: AcpiDsResolvePackageElement 533 * 534 * PARAMETERS: ElementPtr - Pointer to a reference object 535 * 536 * RETURN: Possible new element is stored to the indirect ElementPtr 537 * 538 * DESCRIPTION: Resolve a package element that is a reference to a named 539 * object. 540 * 541 ******************************************************************************/ 542 543 static void 544 AcpiDsResolvePackageElement ( 545 ACPI_OPERAND_OBJECT **ElementPtr) 546 { 547 ACPI_STATUS Status; 548 ACPI_STATUS Status2; 549 ACPI_GENERIC_STATE ScopeInfo; 550 ACPI_OPERAND_OBJECT *Element = *ElementPtr; 551 ACPI_NAMESPACE_NODE *ResolvedNode; 552 ACPI_NAMESPACE_NODE *OriginalNode; 553 char *ExternalPath = ""; 554 ACPI_OBJECT_TYPE Type; 555 556 557 ACPI_FUNCTION_TRACE (DsResolvePackageElement); 558 559 560 /* Check if reference element is already resolved */ 561 562 if (Element->Reference.Resolved) 563 { 564 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_PARSE, 565 "%s: Package element is already resolved\n", 566 ACPI_GET_FUNCTION_NAME)); 567 568 return_VOID; 569 } 570 571 /* Element must be a reference object of correct type */ 572 573 ScopeInfo.Scope.Node = Element->Reference.Node; /* Prefix node */ 574 575 Status = AcpiNsLookup (&ScopeInfo, (char *) Element->Reference.Aml, 576 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, 577 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, 578 NULL, &ResolvedNode); 579 if (ACPI_FAILURE (Status)) 580 { 581 if ((Status == AE_NOT_FOUND) && AcpiGbl_IgnorePackageResolutionErrors) 582 { 583 /* 584 * Optionally be silent about the NOT_FOUND case for the referenced 585 * name. Although this is potentially a serious problem, 586 * it can generate a lot of noise/errors on platforms whose 587 * firmware carries around a bunch of unused Package objects. 588 * To disable these errors, set this global to TRUE: 589 * AcpiGbl_IgnorePackageResolutionErrors 590 * 591 * If the AML actually tries to use such a package, the unresolved 592 * element(s) will be replaced with NULL elements. 593 */ 594 595 /* Referenced name not found, set the element to NULL */ 596 597 AcpiUtRemoveReference (*ElementPtr); 598 *ElementPtr = NULL; 599 return_VOID; 600 } 601 602 Status2 = AcpiNsExternalizeName (ACPI_UINT32_MAX, 603 (char *) Element->Reference.Aml, NULL, &ExternalPath); 604 605 ACPI_EXCEPTION ((AE_INFO, Status, 606 "While resolving a named reference package element - %s", 607 ExternalPath)); 608 if (ACPI_SUCCESS (Status2)) 609 { 610 ACPI_FREE (ExternalPath); 611 } 612 613 /* Could not resolve name, set the element to NULL */ 614 615 AcpiUtRemoveReference (*ElementPtr); 616 *ElementPtr = NULL; 617 return_VOID; 618 } 619 else if (ResolvedNode->Type == ACPI_TYPE_ANY) 620 { 621 /* Named reference not resolved, return a NULL package element */ 622 623 ACPI_ERROR ((AE_INFO, 624 "Could not resolve named package element [%4.4s] in [%4.4s]", 625 ResolvedNode->Name.Ascii, ScopeInfo.Scope.Node->Name.Ascii)); 626 *ElementPtr = NULL; 627 return_VOID; 628 } 629 630 /* 631 * Special handling for Alias objects. We need ResolvedNode to point 632 * to the Alias target. This effectively "resolves" the alias. 633 */ 634 if (ResolvedNode->Type == ACPI_TYPE_LOCAL_ALIAS) 635 { 636 ResolvedNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, 637 ResolvedNode->Object); 638 } 639 640 /* Update the reference object */ 641 642 Element->Reference.Resolved = TRUE; 643 Element->Reference.Node = ResolvedNode; 644 Type = Element->Reference.Node->Type; 645 646 /* 647 * Attempt to resolve the node to a value before we insert it into 648 * the package. If this is a reference to a common data type, 649 * resolve it immediately. According to the ACPI spec, package 650 * elements can only be "data objects" or method references. 651 * Attempt to resolve to an Integer, Buffer, String or Package. 652 * If cannot, return the named reference (for things like Devices, 653 * Methods, etc.) Buffer Fields and Fields will resolve to simple 654 * objects (int/buf/str/pkg). 655 * 656 * NOTE: References to things like Devices, Methods, Mutexes, etc. 657 * will remain as named references. This behavior is not described 658 * in the ACPI spec, but it appears to be an oversight. 659 */ 660 OriginalNode = ResolvedNode; 661 Status = AcpiExResolveNodeToValue (&ResolvedNode, NULL); 662 if (ACPI_FAILURE (Status)) 663 { 664 return_VOID; 665 } 666 667 switch (Type) 668 { 669 /* 670 * These object types are a result of named references, so we will 671 * leave them as reference objects. In other words, these types 672 * have no intrinsic "value". 673 */ 674 case ACPI_TYPE_DEVICE: 675 case ACPI_TYPE_THERMAL: 676 case ACPI_TYPE_METHOD: 677 break; 678 679 case ACPI_TYPE_MUTEX: 680 case ACPI_TYPE_POWER: 681 case ACPI_TYPE_PROCESSOR: 682 case ACPI_TYPE_EVENT: 683 case ACPI_TYPE_REGION: 684 685 /* AcpiExResolveNodeToValue gave these an extra reference */ 686 687 AcpiUtRemoveReference (OriginalNode->Object); 688 break; 689 690 default: 691 /* 692 * For all other types - the node was resolved to an actual 693 * operand object with a value, return the object. Remove 694 * a reference on the existing object. 695 */ 696 AcpiUtRemoveReference (Element); 697 *ElementPtr = (ACPI_OPERAND_OBJECT *) ResolvedNode; 698 break; 699 } 700 701 return_VOID; 702 } 703