exresolv.c revision 167802
167754Smsmith 267754Smsmith/****************************************************************************** 367754Smsmith * 477424Smsmith * Module Name: exresolv - AML Interpreter object resolution 5167802Sjkim * $Revision: 1.142 $ 667754Smsmith * 767754Smsmith *****************************************************************************/ 867754Smsmith 967754Smsmith/****************************************************************************** 1067754Smsmith * 1167754Smsmith * 1. Copyright Notice 1267754Smsmith * 13167802Sjkim * Some or all of this work - Copyright (c) 1999 - 2007, Intel Corp. 1470243Smsmith * All rights reserved. 1567754Smsmith * 1667754Smsmith * 2. License 1767754Smsmith * 1867754Smsmith * 2.1. This is your license from Intel Corp. under its intellectual property 1967754Smsmith * rights. You may have additional license terms from the party that provided 2067754Smsmith * you this software, covering your right to use that party's intellectual 2167754Smsmith * property rights. 2267754Smsmith * 2367754Smsmith * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 2467754Smsmith * copy of the source code appearing in this file ("Covered Code") an 2567754Smsmith * irrevocable, perpetual, worldwide license under Intel's copyrights in the 2667754Smsmith * base code distributed originally by Intel ("Original Intel Code") to copy, 2767754Smsmith * make derivatives, distribute, use and display any portion of the Covered 2867754Smsmith * Code in any form, with the right to sublicense such rights; and 2967754Smsmith * 3067754Smsmith * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 3167754Smsmith * license (with the right to sublicense), under only those claims of Intel 3267754Smsmith * patents that are infringed by the Original Intel Code, to make, use, sell, 3367754Smsmith * offer to sell, and import the Covered Code and derivative works thereof 3467754Smsmith * solely to the minimum extent necessary to exercise the above copyright 3567754Smsmith * license, and in no event shall the patent license extend to any additions 3667754Smsmith * to or modifications of the Original Intel Code. No other license or right 3767754Smsmith * is granted directly or by implication, estoppel or otherwise; 3867754Smsmith * 3967754Smsmith * The above copyright and patent license is granted only if the following 4067754Smsmith * conditions are met: 4167754Smsmith * 4267754Smsmith * 3. Conditions 4367754Smsmith * 4467754Smsmith * 3.1. Redistribution of Source with Rights to Further Distribute Source. 4567754Smsmith * Redistribution of source code of any substantial portion of the Covered 4667754Smsmith * Code or modification with rights to further distribute source must include 4767754Smsmith * the above Copyright Notice, the above License, this list of Conditions, 4867754Smsmith * and the following Disclaimer and Export Compliance provision. In addition, 4967754Smsmith * Licensee must cause all Covered Code to which Licensee contributes to 5067754Smsmith * contain a file documenting the changes Licensee made to create that Covered 5167754Smsmith * Code and the date of any change. Licensee must include in that file the 5267754Smsmith * documentation of any changes made by any predecessor Licensee. Licensee 5367754Smsmith * must include a prominent statement that the modification is derived, 5467754Smsmith * directly or indirectly, from Original Intel Code. 5567754Smsmith * 5667754Smsmith * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 5767754Smsmith * Redistribution of source code of any substantial portion of the Covered 5867754Smsmith * Code or modification without rights to further distribute source must 5967754Smsmith * include the following Disclaimer and Export Compliance provision in the 6067754Smsmith * documentation and/or other materials provided with distribution. In 6167754Smsmith * addition, Licensee may not authorize further sublicense of source of any 6267754Smsmith * portion of the Covered Code, and must include terms to the effect that the 6367754Smsmith * license from Licensee to its licensee is limited to the intellectual 6467754Smsmith * property embodied in the software Licensee provides to its licensee, and 6567754Smsmith * not to intellectual property embodied in modifications its licensee may 6667754Smsmith * make. 6767754Smsmith * 6867754Smsmith * 3.3. Redistribution of Executable. Redistribution in executable form of any 6967754Smsmith * substantial portion of the Covered Code or modification must reproduce the 7067754Smsmith * above Copyright Notice, and the following Disclaimer and Export Compliance 7167754Smsmith * provision in the documentation and/or other materials provided with the 7267754Smsmith * distribution. 7367754Smsmith * 7467754Smsmith * 3.4. Intel retains all right, title, and interest in and to the Original 7567754Smsmith * Intel Code. 7667754Smsmith * 7767754Smsmith * 3.5. Neither the name Intel nor any other trademark owned or controlled by 7867754Smsmith * Intel shall be used in advertising or otherwise to promote the sale, use or 7967754Smsmith * other dealings in products derived from or relating to the Covered Code 8067754Smsmith * without prior written authorization from Intel. 8167754Smsmith * 8267754Smsmith * 4. Disclaimer and Export Compliance 8367754Smsmith * 8467754Smsmith * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 8567754Smsmith * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 8667754Smsmith * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 8767754Smsmith * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 8867754Smsmith * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 8967754Smsmith * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 9067754Smsmith * PARTICULAR PURPOSE. 9167754Smsmith * 9267754Smsmith * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 9367754Smsmith * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 9467754Smsmith * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 9567754Smsmith * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 9667754Smsmith * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 9767754Smsmith * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 9867754Smsmith * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 9967754Smsmith * LIMITED REMEDY. 10067754Smsmith * 10167754Smsmith * 4.3. Licensee shall not export, either directly or indirectly, any of this 10267754Smsmith * software or system incorporating such software without first obtaining any 10367754Smsmith * required license or other approval from the U. S. Department of Commerce or 10467754Smsmith * any other agency or department of the United States Government. In the 10567754Smsmith * event Licensee exports any such software from the United States or 10667754Smsmith * re-exports any such software from a foreign destination, Licensee shall 10767754Smsmith * ensure that the distribution and export/re-export of the software is in 10867754Smsmith * compliance with all laws, regulations, orders, or other restrictions of the 10967754Smsmith * U.S. Export Administration Regulations. Licensee agrees that neither it nor 11067754Smsmith * any of its subsidiaries will export/re-export any technical data, process, 11167754Smsmith * software, or service, directly or indirectly, to any country for which the 11267754Smsmith * United States government or any agency thereof requires an export license, 11367754Smsmith * other governmental approval, or letter of assurance, without first obtaining 11467754Smsmith * such license, approval or letter. 11567754Smsmith * 11667754Smsmith *****************************************************************************/ 11767754Smsmith 11877424Smsmith#define __EXRESOLV_C__ 11967754Smsmith 120151600Sobrien#include <contrib/dev/acpica/acpi.h> 121151600Sobrien#include <contrib/dev/acpica/amlcode.h> 122151600Sobrien#include <contrib/dev/acpica/acdispat.h> 123151600Sobrien#include <contrib/dev/acpica/acinterp.h> 124151600Sobrien#include <contrib/dev/acpica/acnamesp.h> 125151600Sobrien#include <contrib/dev/acpica/acparser.h> 12667754Smsmith 12767754Smsmith 12877424Smsmith#define _COMPONENT ACPI_EXECUTER 12991116Smsmith ACPI_MODULE_NAME ("exresolv") 13067754Smsmith 131151937Sjkim/* Local prototypes */ 13267754Smsmith 133151937Sjkimstatic ACPI_STATUS 134151937SjkimAcpiExResolveObjectToValue ( 135151937Sjkim ACPI_OPERAND_OBJECT **StackPtr, 136151937Sjkim ACPI_WALK_STATE *WalkState); 137151937Sjkim 138151937Sjkim 13967754Smsmith/******************************************************************************* 14067754Smsmith * 14177424Smsmith * FUNCTION: AcpiExResolveToValue 14267754Smsmith * 14367754Smsmith * PARAMETERS: **StackPtr - Points to entry on ObjStack, which can 14477424Smsmith * be either an (ACPI_OPERAND_OBJECT *) 14567754Smsmith * or an ACPI_HANDLE. 14677424Smsmith * WalkState - Current method state 14767754Smsmith * 14867754Smsmith * RETURN: Status 14967754Smsmith * 15071867Smsmith * DESCRIPTION: Convert Reference objects to values 15167754Smsmith * 15267754Smsmith ******************************************************************************/ 15367754Smsmith 15467754SmsmithACPI_STATUS 15577424SmsmithAcpiExResolveToValue ( 15667754Smsmith ACPI_OPERAND_OBJECT **StackPtr, 15767754Smsmith ACPI_WALK_STATE *WalkState) 15867754Smsmith{ 15977424Smsmith ACPI_STATUS Status; 16067754Smsmith 16167754Smsmith 162167802Sjkim ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr); 16367754Smsmith 16467754Smsmith 16567754Smsmith if (!StackPtr || !*StackPtr) 16667754Smsmith { 167167802Sjkim ACPI_ERROR ((AE_INFO, "Internal - null pointer")); 16867754Smsmith return_ACPI_STATUS (AE_AML_NO_OPERAND); 16967754Smsmith } 17067754Smsmith 17167754Smsmith /* 17267754Smsmith * The entity pointed to by the StackPtr can be either 17367754Smsmith * 1) A valid ACPI_OPERAND_OBJECT, or 17467754Smsmith * 2) A ACPI_NAMESPACE_NODE (NamedObj) 17567754Smsmith */ 17699679Siwasaki if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND) 17767754Smsmith { 17877424Smsmith Status = AcpiExResolveObjectToValue (StackPtr, WalkState); 17967754Smsmith if (ACPI_FAILURE (Status)) 18067754Smsmith { 18167754Smsmith return_ACPI_STATUS (Status); 18267754Smsmith } 183151937Sjkim 184151937Sjkim if (!*StackPtr) 185151937Sjkim { 186167802Sjkim ACPI_ERROR ((AE_INFO, "Internal - null pointer")); 187151937Sjkim return_ACPI_STATUS (AE_AML_NO_OPERAND); 188151937Sjkim } 18967754Smsmith } 19067754Smsmith 19167754Smsmith /* 19277424Smsmith * Object on the stack may have changed if AcpiExResolveObjectToValue() 19367754Smsmith * was called (i.e., we can't use an _else_ here.) 19467754Smsmith */ 19591116Smsmith if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED) 19667754Smsmith { 19799679Siwasaki Status = AcpiExResolveNodeToValue ( 19899679Siwasaki ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr), 19977424Smsmith WalkState); 20077424Smsmith if (ACPI_FAILURE (Status)) 20177424Smsmith { 20277424Smsmith return_ACPI_STATUS (Status); 20377424Smsmith } 20467754Smsmith } 20567754Smsmith 20699146Siwasaki ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr)); 20777424Smsmith return_ACPI_STATUS (AE_OK); 20867754Smsmith} 20967754Smsmith 21067754Smsmith 21167754Smsmith/******************************************************************************* 21267754Smsmith * 21377424Smsmith * FUNCTION: AcpiExResolveObjectToValue 21467754Smsmith * 215151937Sjkim * PARAMETERS: StackPtr - Pointer to an internal object 21677424Smsmith * WalkState - Current method state 21767754Smsmith * 21867754Smsmith * RETURN: Status 21967754Smsmith * 220151937Sjkim * DESCRIPTION: Retrieve the value from an internal object. The Reference type 22167754Smsmith * uses the associated AML opcode to determine the value. 22267754Smsmith * 22367754Smsmith ******************************************************************************/ 22467754Smsmith 225151937Sjkimstatic ACPI_STATUS 22677424SmsmithAcpiExResolveObjectToValue ( 22767754Smsmith ACPI_OPERAND_OBJECT **StackPtr, 22867754Smsmith ACPI_WALK_STATE *WalkState) 22967754Smsmith{ 23077424Smsmith ACPI_STATUS Status = AE_OK; 23167754Smsmith ACPI_OPERAND_OBJECT *StackDesc; 232167802Sjkim ACPI_OPERAND_OBJECT *ObjDesc = NULL; 23367754Smsmith UINT16 Opcode; 23467754Smsmith 23567754Smsmith 236167802Sjkim ACPI_FUNCTION_TRACE (ExResolveObjectToValue); 23767754Smsmith 23867754Smsmith 23967754Smsmith StackDesc = *StackPtr; 24067754Smsmith 24167754Smsmith /* This is an ACPI_OPERAND_OBJECT */ 24267754Smsmith 24399679Siwasaki switch (ACPI_GET_OBJECT_TYPE (StackDesc)) 24467754Smsmith { 245107325Siwasaki case ACPI_TYPE_LOCAL_REFERENCE: 24667754Smsmith 24777424Smsmith Opcode = StackDesc->Reference.Opcode; 24867754Smsmith 24967754Smsmith switch (Opcode) 25067754Smsmith { 25167754Smsmith case AML_LOCAL_OP: 25277424Smsmith case AML_ARG_OP: 25367754Smsmith 25467754Smsmith /* 25567754Smsmith * Get the local from the method's state info 25667754Smsmith * Note: this increments the local's object reference count 25767754Smsmith */ 25877424Smsmith Status = AcpiDsMethodDataGetValue (Opcode, 25977424Smsmith StackDesc->Reference.Offset, WalkState, &ObjDesc); 26067754Smsmith if (ACPI_FAILURE (Status)) 26167754Smsmith { 26267754Smsmith return_ACPI_STATUS (Status); 26367754Smsmith } 26467754Smsmith 265129684Snjl ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n", 266129684Snjl StackDesc->Reference.Offset, ObjDesc)); 267129684Snjl 26867754Smsmith /* 26967754Smsmith * Now we can delete the original Reference Object and 270129684Snjl * replace it with the resolved value 27167754Smsmith */ 27277424Smsmith AcpiUtRemoveReference (StackDesc); 27367754Smsmith *StackPtr = ObjDesc; 27467754Smsmith break; 27567754Smsmith 27667754Smsmith 27767754Smsmith case AML_INDEX_OP: 27867754Smsmith 27967754Smsmith switch (StackDesc->Reference.TargetType) 28067754Smsmith { 28167754Smsmith case ACPI_TYPE_BUFFER_FIELD: 28267754Smsmith 28367754Smsmith /* Just return - leave the Reference on the stack */ 28467754Smsmith break; 28567754Smsmith 28667754Smsmith 28767754Smsmith case ACPI_TYPE_PACKAGE: 28899679Siwasaki 28967754Smsmith ObjDesc = *StackDesc->Reference.Where; 29067754Smsmith if (ObjDesc) 29167754Smsmith { 29267754Smsmith /* 29367754Smsmith * Valid obj descriptor, copy pointer to return value 29467754Smsmith * (i.e., dereference the package index) 29567754Smsmith * Delete the ref object, increment the returned object 29667754Smsmith */ 29777424Smsmith AcpiUtRemoveReference (StackDesc); 29877424Smsmith AcpiUtAddReference (ObjDesc); 29967754Smsmith *StackPtr = ObjDesc; 30067754Smsmith } 30167754Smsmith else 30267754Smsmith { 30367754Smsmith /* 30467754Smsmith * A NULL object descriptor means an unitialized element of 30577424Smsmith * the package, can't dereference it 30667754Smsmith */ 307167802Sjkim ACPI_ERROR ((AE_INFO, 308167802Sjkim "Attempt to deref an Index to NULL pkg element Idx=%p", 30977424Smsmith StackDesc)); 31067754Smsmith Status = AE_AML_UNINITIALIZED_ELEMENT; 31167754Smsmith } 31267754Smsmith break; 31367754Smsmith 31499679Siwasaki 31567754Smsmith default: 31699679Siwasaki 31777424Smsmith /* Invalid reference object */ 31867754Smsmith 319167802Sjkim ACPI_ERROR ((AE_INFO, 320167802Sjkim "Unknown TargetType %X in Index/Reference obj %p", 32167754Smsmith StackDesc->Reference.TargetType, StackDesc)); 32267754Smsmith Status = AE_AML_INTERNAL; 32367754Smsmith break; 32467754Smsmith } 32567754Smsmith break; 32667754Smsmith 32767754Smsmith 328100966Siwasaki case AML_REF_OF_OP: 32967754Smsmith case AML_DEBUG_OP: 330123315Snjl case AML_LOAD_OP: 33167754Smsmith 33267754Smsmith /* Just leave the object as-is */ 333100966Siwasaki 33467754Smsmith break; 33567754Smsmith 336151937Sjkim case AML_INT_NAMEPATH_OP: /* Reference to a named object */ 33767754Smsmith 338167802Sjkim /* Dereference the name */ 339151937Sjkim 340167802Sjkim if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) || 341167802Sjkim (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL)) 342167802Sjkim { 343167802Sjkim /* These node types do not have 'real' subobjects */ 344167802Sjkim 345167802Sjkim *StackPtr = (void *) StackDesc->Reference.Node; 346167802Sjkim } 347167802Sjkim else 348167802Sjkim { 349167802Sjkim /* Get the object pointed to by the namespace node */ 350167802Sjkim 351167802Sjkim *StackPtr = (StackDesc->Reference.Node)->Object; 352167802Sjkim AcpiUtAddReference (*StackPtr); 353167802Sjkim } 354167802Sjkim 355151937Sjkim AcpiUtRemoveReference (StackDesc); 356151937Sjkim break; 357151937Sjkim 35867754Smsmith default: 35967754Smsmith 360167802Sjkim ACPI_ERROR ((AE_INFO, 361167802Sjkim "Unknown Reference opcode %X (%s) in %p", 362123315Snjl Opcode, AcpiPsGetOpcodeName (Opcode), StackDesc)); 36367754Smsmith Status = AE_AML_INTERNAL; 36477424Smsmith break; 36599679Siwasaki } 36699679Siwasaki break; 36767754Smsmith 36867754Smsmith 36999146Siwasaki case ACPI_TYPE_BUFFER: 37099146Siwasaki 37199146Siwasaki Status = AcpiDsGetBufferArguments (StackDesc); 37299146Siwasaki break; 37399146Siwasaki 37499146Siwasaki 37599146Siwasaki case ACPI_TYPE_PACKAGE: 37699146Siwasaki 37799146Siwasaki Status = AcpiDsGetPackageArguments (StackDesc); 37899146Siwasaki break; 37999146Siwasaki 38099146Siwasaki 38177424Smsmith case ACPI_TYPE_BUFFER_FIELD: 382107325Siwasaki case ACPI_TYPE_LOCAL_REGION_FIELD: 383107325Siwasaki case ACPI_TYPE_LOCAL_BANK_FIELD: 384107325Siwasaki case ACPI_TYPE_LOCAL_INDEX_FIELD: 38567754Smsmith 38687031Smsmith ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "FieldRead SourceDesc=%p Type=%X\n", 38799679Siwasaki StackDesc, ACPI_GET_OBJECT_TYPE (StackDesc))); 38867754Smsmith 38999146Siwasaki Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc); 390167802Sjkim 391167802Sjkim /* Remove a reference to the original operand, then override */ 392167802Sjkim 393167802Sjkim AcpiUtRemoveReference (*StackPtr); 39467754Smsmith *StackPtr = (void *) ObjDesc; 39567754Smsmith break; 39667754Smsmith 39767754Smsmith default: 39867754Smsmith break; 39987031Smsmith } 40067754Smsmith 40167754Smsmith return_ACPI_STATUS (Status); 40267754Smsmith} 40367754Smsmith 40467754Smsmith 405104470Siwasaki/******************************************************************************* 406104470Siwasaki * 407104470Siwasaki * FUNCTION: AcpiExResolveMultiple 408104470Siwasaki * 409104470Siwasaki * PARAMETERS: WalkState - Current state (contains AML opcode) 410104470Siwasaki * Operand - Starting point for resolution 411104470Siwasaki * ReturnType - Where the object type is returned 412104470Siwasaki * ReturnDesc - Where the resolved object is returned 413104470Siwasaki * 414104470Siwasaki * RETURN: Status 415104470Siwasaki * 416104470Siwasaki * DESCRIPTION: Return the base object and type. Traverse a reference list if 417104470Siwasaki * necessary to get to the base object. 418104470Siwasaki * 419104470Siwasaki ******************************************************************************/ 420104470Siwasaki 421104470SiwasakiACPI_STATUS 422104470SiwasakiAcpiExResolveMultiple ( 423104470Siwasaki ACPI_WALK_STATE *WalkState, 424104470Siwasaki ACPI_OPERAND_OBJECT *Operand, 425104470Siwasaki ACPI_OBJECT_TYPE *ReturnType, 426104470Siwasaki ACPI_OPERAND_OBJECT **ReturnDesc) 427104470Siwasaki{ 428104470Siwasaki ACPI_OPERAND_OBJECT *ObjDesc = (void *) Operand; 429104470Siwasaki ACPI_NAMESPACE_NODE *Node; 430104470Siwasaki ACPI_OBJECT_TYPE Type; 431138287Smarks ACPI_STATUS Status; 432104470Siwasaki 433104470Siwasaki 434167802Sjkim ACPI_FUNCTION_TRACE (AcpiExResolveMultiple); 435104470Siwasaki 436104470Siwasaki 437151937Sjkim /* Operand can be either a namespace node or an operand descriptor */ 438138287Smarks 439138287Smarks switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)) 440138287Smarks { 441138287Smarks case ACPI_DESC_TYPE_OPERAND: 442138287Smarks Type = ObjDesc->Common.Type; 443138287Smarks break; 444138287Smarks 445138287Smarks case ACPI_DESC_TYPE_NAMED: 446138287Smarks Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type; 447138287Smarks ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc); 448138287Smarks 449138287Smarks /* If we had an Alias node, use the attached object for type info */ 450138287Smarks 451138287Smarks if (Type == ACPI_TYPE_LOCAL_ALIAS) 452138287Smarks { 453138287Smarks Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type; 454138287Smarks ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc); 455138287Smarks } 456138287Smarks break; 457138287Smarks 458138287Smarks default: 459138287Smarks return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 460138287Smarks } 461138287Smarks 462151937Sjkim /* If type is anything other than a reference, we are done */ 463138287Smarks 464138287Smarks if (Type != ACPI_TYPE_LOCAL_REFERENCE) 465138287Smarks { 466138287Smarks goto Exit; 467138287Smarks } 468138287Smarks 469138287Smarks /* 470104470Siwasaki * For reference objects created via the RefOf or Index operators, 471114237Snjl * we need to get to the base object (as per the ACPI specification 472114237Snjl * of the ObjectType and SizeOf operators). This means traversing 473104470Siwasaki * the list of possibly many nested references. 474104470Siwasaki */ 475107325Siwasaki while (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_REFERENCE) 476104470Siwasaki { 477104470Siwasaki switch (ObjDesc->Reference.Opcode) 478104470Siwasaki { 479104470Siwasaki case AML_REF_OF_OP: 480167802Sjkim case AML_INT_NAMEPATH_OP: 481104470Siwasaki 482104470Siwasaki /* Dereference the reference pointer */ 483104470Siwasaki 484167802Sjkim if (ObjDesc->Reference.Opcode == AML_REF_OF_OP) 485167802Sjkim { 486167802Sjkim Node = ObjDesc->Reference.Object; 487167802Sjkim } 488167802Sjkim else /* AML_INT_NAMEPATH_OP */ 489167802Sjkim { 490167802Sjkim Node = ObjDesc->Reference.Node; 491167802Sjkim } 492104470Siwasaki 493104470Siwasaki /* All "References" point to a NS node */ 494104470Siwasaki 495104470Siwasaki if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED) 496104470Siwasaki { 497167802Sjkim ACPI_ERROR ((AE_INFO, 498167802Sjkim "Not a NS node %p [%s]", 499151937Sjkim Node, AcpiUtGetDescriptorName (Node))); 500104470Siwasaki return_ACPI_STATUS (AE_AML_INTERNAL); 501104470Siwasaki } 502104470Siwasaki 503104470Siwasaki /* Get the attached object */ 504104470Siwasaki 505104470Siwasaki ObjDesc = AcpiNsGetAttachedObject (Node); 506104470Siwasaki if (!ObjDesc) 507104470Siwasaki { 508104470Siwasaki /* No object, use the NS node type */ 509104470Siwasaki 510104470Siwasaki Type = AcpiNsGetType (Node); 511104470Siwasaki goto Exit; 512104470Siwasaki } 513104470Siwasaki 514104470Siwasaki /* Check for circular references */ 515104470Siwasaki 516104470Siwasaki if (ObjDesc == Operand) 517104470Siwasaki { 518104470Siwasaki return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE); 519104470Siwasaki } 520104470Siwasaki break; 521104470Siwasaki 522104470Siwasaki 523104470Siwasaki case AML_INDEX_OP: 524104470Siwasaki 525104470Siwasaki /* Get the type of this reference (index into another object) */ 526104470Siwasaki 527104470Siwasaki Type = ObjDesc->Reference.TargetType; 528104470Siwasaki if (Type != ACPI_TYPE_PACKAGE) 529104470Siwasaki { 530104470Siwasaki goto Exit; 531104470Siwasaki } 532104470Siwasaki 533104470Siwasaki /* 534104470Siwasaki * The main object is a package, we want to get the type 535104470Siwasaki * of the individual package element that is referenced by 536104470Siwasaki * the index. 537104470Siwasaki * 538104470Siwasaki * This could of course in turn be another reference object. 539104470Siwasaki */ 540104470Siwasaki ObjDesc = *(ObjDesc->Reference.Where); 541151937Sjkim if (!ObjDesc) 542151937Sjkim { 543151937Sjkim /* NULL package elements are allowed */ 544151937Sjkim 545151937Sjkim Type = 0; /* Uninitialized */ 546151937Sjkim goto Exit; 547151937Sjkim } 548104470Siwasaki break; 549104470Siwasaki 550104470Siwasaki 551138287Smarks case AML_LOCAL_OP: 552138287Smarks case AML_ARG_OP: 553138287Smarks 554138287Smarks if (ReturnDesc) 555138287Smarks { 556138287Smarks Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Opcode, 557151937Sjkim ObjDesc->Reference.Offset, WalkState, &ObjDesc); 558138287Smarks if (ACPI_FAILURE (Status)) 559138287Smarks { 560138287Smarks return_ACPI_STATUS (Status); 561138287Smarks } 562138287Smarks AcpiUtRemoveReference (ObjDesc); 563138287Smarks } 564138287Smarks else 565138287Smarks { 566138287Smarks Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Opcode, 567138287Smarks ObjDesc->Reference.Offset, WalkState, &Node); 568138287Smarks if (ACPI_FAILURE (Status)) 569138287Smarks { 570138287Smarks return_ACPI_STATUS (Status); 571138287Smarks } 572138287Smarks 573138287Smarks ObjDesc = AcpiNsGetAttachedObject (Node); 574138287Smarks if (!ObjDesc) 575138287Smarks { 576138287Smarks Type = ACPI_TYPE_ANY; 577138287Smarks goto Exit; 578138287Smarks } 579138287Smarks } 580138287Smarks break; 581138287Smarks 582138287Smarks 583104470Siwasaki case AML_DEBUG_OP: 584104470Siwasaki 585104470Siwasaki /* The Debug Object is of type "DebugObject" */ 586104470Siwasaki 587104470Siwasaki Type = ACPI_TYPE_DEBUG_OBJECT; 588104470Siwasaki goto Exit; 589104470Siwasaki 590104470Siwasaki 591104470Siwasaki default: 592104470Siwasaki 593167802Sjkim ACPI_ERROR ((AE_INFO, 594167802Sjkim "Unknown Reference subtype %X", 595104470Siwasaki ObjDesc->Reference.Opcode)); 596104470Siwasaki return_ACPI_STATUS (AE_AML_INTERNAL); 597104470Siwasaki } 598104470Siwasaki } 599104470Siwasaki 600104470Siwasaki /* 601104470Siwasaki * Now we are guaranteed to have an object that has not been created 602104470Siwasaki * via the RefOf or Index operators. 603104470Siwasaki */ 604104470Siwasaki Type = ACPI_GET_OBJECT_TYPE (ObjDesc); 605104470Siwasaki 606104470Siwasaki 607104470SiwasakiExit: 608104470Siwasaki /* Convert internal types to external types */ 609104470Siwasaki 610104470Siwasaki switch (Type) 611104470Siwasaki { 612107325Siwasaki case ACPI_TYPE_LOCAL_REGION_FIELD: 613107325Siwasaki case ACPI_TYPE_LOCAL_BANK_FIELD: 614107325Siwasaki case ACPI_TYPE_LOCAL_INDEX_FIELD: 615104470Siwasaki 616104470Siwasaki Type = ACPI_TYPE_FIELD_UNIT; 617104470Siwasaki break; 618104470Siwasaki 619107325Siwasaki case ACPI_TYPE_LOCAL_SCOPE: 620107325Siwasaki 621107325Siwasaki /* Per ACPI Specification, Scope is untyped */ 622107325Siwasaki 623107325Siwasaki Type = ACPI_TYPE_ANY; 624107325Siwasaki break; 625107325Siwasaki 626104470Siwasaki default: 627104470Siwasaki /* No change to Type required */ 628104470Siwasaki break; 629104470Siwasaki } 630104470Siwasaki 631104470Siwasaki *ReturnType = Type; 632104470Siwasaki if (ReturnDesc) 633104470Siwasaki { 634104470Siwasaki *ReturnDesc = ObjDesc; 635104470Siwasaki } 636104470Siwasaki return_ACPI_STATUS (AE_OK); 637104470Siwasaki} 638104470Siwasaki 639104470Siwasaki 640