NetBSD-5.0.2/sys/dist/acpica/exresolv.c
/******************************************************************************
*
* Module Name: exresolv - AML Interpreter object resolution
* $Revision: 1.4 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#define __EXRESOLV_C__
#include "acpi.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acparser.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exresolv")
/* Local prototypes */
static ACPI_STATUS
AcpiExResolveObjectToValue (
ACPI_OPERAND_OBJECT **StackPtr,
ACPI_WALK_STATE *WalkState);
/*******************************************************************************
*
* FUNCTION: AcpiExResolveToValue
*
* PARAMETERS: **StackPtr - Points to entry on ObjStack, which can
* be either an (ACPI_OPERAND_OBJECT *)
* or an ACPI_HANDLE.
* WalkState - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Convert Reference objects to values
*
******************************************************************************/
ACPI_STATUS
AcpiExResolveToValue (
ACPI_OPERAND_OBJECT **StackPtr,
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr);
if (!StackPtr || !*StackPtr)
{
ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
/*
* The entity pointed to by the StackPtr can be either
* 1) A valid ACPI_OPERAND_OBJECT, or
* 2) A ACPI_NAMESPACE_NODE (NamedObj)
*/
if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND)
{
Status = AcpiExResolveObjectToValue (StackPtr, WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (!*StackPtr)
{
ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
}
/*
* Object on the stack may have changed if AcpiExResolveObjectToValue()
* was called (i.e., we can't use an _else_ here.)
*/
if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED)
{
Status = AcpiExResolveNodeToValue (
ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr),
WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr));
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExResolveObjectToValue
*
* PARAMETERS: StackPtr - Pointer to an internal object
* WalkState - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Retrieve the value from an internal object. The Reference type
* uses the associated AML opcode to determine the value.
*
******************************************************************************/
static ACPI_STATUS
AcpiExResolveObjectToValue (
ACPI_OPERAND_OBJECT **StackPtr,
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status = AE_OK;
ACPI_OPERAND_OBJECT *StackDesc;
ACPI_OPERAND_OBJECT *ObjDesc = NULL;
UINT16 Opcode;
ACPI_FUNCTION_TRACE (ExResolveObjectToValue);
StackDesc = *StackPtr;
/* This is an ACPI_OPERAND_OBJECT */
switch (ACPI_GET_OBJECT_TYPE (StackDesc))
{
case ACPI_TYPE_LOCAL_REFERENCE:
Opcode = StackDesc->Reference.Opcode;
switch (Opcode)
{
case AML_LOCAL_OP:
case AML_ARG_OP:
/*
* Get the local from the method's state info
* Note: this increments the local's object reference count
*/
Status = AcpiDsMethodDataGetValue (Opcode,
StackDesc->Reference.Offset, WalkState, &ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n",
StackDesc->Reference.Offset, ObjDesc));
/*
* Now we can delete the original Reference Object and
* replace it with the resolved value
*/
AcpiUtRemoveReference (StackDesc);
*StackPtr = ObjDesc;
break;
case AML_INDEX_OP:
switch (StackDesc->Reference.TargetType)
{
case ACPI_TYPE_BUFFER_FIELD:
/* Just return - do not dereference */
break;
case ACPI_TYPE_PACKAGE:
/* If method call or CopyObject - do not dereference */
if ((WalkState->Opcode == AML_INT_METHODCALL_OP) ||
(WalkState->Opcode == AML_COPY_OP))
{
break;
}
/* Otherwise, dereference the PackageIndex to a package element */
ObjDesc = *StackDesc->Reference.Where;
if (ObjDesc)
{
/*
* Valid object descriptor, copy pointer to return value
* (i.e., dereference the package index)
* Delete the ref object, increment the returned object
*/
AcpiUtRemoveReference (StackDesc);
AcpiUtAddReference (ObjDesc);
*StackPtr = ObjDesc;
}
else
{
/*
* A NULL object descriptor means an uninitialized element of
* the package, can't dereference it
*/
ACPI_ERROR ((AE_INFO,
"Attempt to dereference an Index to NULL package element Idx=%p",
StackDesc));
Status = AE_AML_UNINITIALIZED_ELEMENT;
}
break;
default:
/* Invalid reference object */
ACPI_ERROR ((AE_INFO,
"Unknown TargetType %X in Index/Reference object %p",
StackDesc->Reference.TargetType, StackDesc));
Status = AE_AML_INTERNAL;
break;
}
break;
case AML_REF_OF_OP:
case AML_DEBUG_OP:
case AML_LOAD_OP:
/* Just leave the object as-is, do not dereference */
break;
case AML_INT_NAMEPATH_OP: /* Reference to a named object */
/* Dereference the name */
if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) ||
(StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))
{
/* These node types do not have 'real' subobjects */
*StackPtr = (void *) StackDesc->Reference.Node;
}
else
{
/* Get the object pointed to by the namespace node */
*StackPtr = (StackDesc->Reference.Node)->Object;
AcpiUtAddReference (*StackPtr);
}
AcpiUtRemoveReference (StackDesc);
break;
default:
ACPI_ERROR ((AE_INFO,
"Unknown Reference opcode %X (%s) in %p",
Opcode, AcpiPsGetOpcodeName (Opcode), StackDesc));
Status = AE_AML_INTERNAL;
break;
}
break;
case ACPI_TYPE_BUFFER:
Status = AcpiDsGetBufferArguments (StackDesc);
break;
case ACPI_TYPE_PACKAGE:
Status = AcpiDsGetPackageArguments (StackDesc);
break;
case ACPI_TYPE_BUFFER_FIELD:
case ACPI_TYPE_LOCAL_REGION_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
case ACPI_TYPE_LOCAL_INDEX_FIELD:
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "FieldRead SourceDesc=%p Type=%X\n",
StackDesc, ACPI_GET_OBJECT_TYPE (StackDesc)));
Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc);
/* Remove a reference to the original operand, then override */
AcpiUtRemoveReference (*StackPtr);
*StackPtr = (void *) ObjDesc;
break;
default:
break;
}
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiExResolveMultiple
*
* PARAMETERS: WalkState - Current state (contains AML opcode)
* Operand - Starting point for resolution
* ReturnType - Where the object type is returned
* ReturnDesc - Where the resolved object is returned
*
* RETURN: Status
*
* DESCRIPTION: Return the base object and type. Traverse a reference list if
* necessary to get to the base object.
*
******************************************************************************/
ACPI_STATUS
AcpiExResolveMultiple (
ACPI_WALK_STATE *WalkState,
ACPI_OPERAND_OBJECT *Operand,
ACPI_OBJECT_TYPE *ReturnType,
ACPI_OPERAND_OBJECT **ReturnDesc)
{
ACPI_OPERAND_OBJECT *ObjDesc = (void *) Operand;
ACPI_NAMESPACE_NODE *Node;
ACPI_OBJECT_TYPE Type;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (AcpiExResolveMultiple);
/* Operand can be either a namespace node or an operand descriptor */
switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
{
case ACPI_DESC_TYPE_OPERAND:
Type = ObjDesc->Common.Type;
break;
case ACPI_DESC_TYPE_NAMED:
Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);
/* If we had an Alias node, use the attached object for type info */
if (Type == ACPI_TYPE_LOCAL_ALIAS)
{
Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);
}
break;
default:
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/* If type is anything other than a reference, we are done */
if (Type != ACPI_TYPE_LOCAL_REFERENCE)
{
goto Exit;
}
/*
* For reference objects created via the RefOf, Index, or Load/LoadTable
* operators, we need to get to the base object (as per the ACPI
* specification of the ObjectType and SizeOf operators). This means
* traversing the list of possibly many nested references.
*/
while (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_LOCAL_REFERENCE)
{
switch (ObjDesc->Reference.Opcode)
{
case AML_REF_OF_OP:
case AML_INT_NAMEPATH_OP:
/* Dereference the reference pointer */
if (ObjDesc->Reference.Opcode == AML_REF_OF_OP)
{
Node = ObjDesc->Reference.Object;
}
else /* AML_INT_NAMEPATH_OP */
{
Node = ObjDesc->Reference.Node;
}
/* All "References" point to a NS node */
if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
{
ACPI_ERROR ((AE_INFO,
"Not a NS node %p [%s]",
Node, AcpiUtGetDescriptorName (Node)));
return_ACPI_STATUS (AE_AML_INTERNAL);
}
/* Get the attached object */
ObjDesc = AcpiNsGetAttachedObject (Node);
if (!ObjDesc)
{
/* No object, use the NS node type */
Type = AcpiNsGetType (Node);
goto Exit;
}
/* Check for circular references */
if (ObjDesc == Operand)
{
return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);
}
break;
case AML_INDEX_OP:
/* Get the type of this reference (index into another object) */
Type = ObjDesc->Reference.TargetType;
if (Type != ACPI_TYPE_PACKAGE)
{
goto Exit;
}
/*
* The main object is a package, we want to get the type
* of the individual package element that is referenced by
* the index.
*
* This could of course in turn be another reference object.
*/
ObjDesc = *(ObjDesc->Reference.Where);
if (!ObjDesc)
{
/* NULL package elements are allowed */
Type = 0; /* Uninitialized */
goto Exit;
}
break;
case AML_LOAD_OP:
Type = ACPI_TYPE_DDB_HANDLE;
goto Exit;
case AML_LOCAL_OP:
case AML_ARG_OP:
if (ReturnDesc)
{
Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Opcode,
ObjDesc->Reference.Offset, WalkState, &ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
AcpiUtRemoveReference (ObjDesc);
}
else
{
Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Opcode,
ObjDesc->Reference.Offset, WalkState, &Node);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ObjDesc = AcpiNsGetAttachedObject (Node);
if (!ObjDesc)
{
Type = ACPI_TYPE_ANY;
goto Exit;
}
}
break;
case AML_DEBUG_OP:
/* The Debug Object is of type "DebugObject" */
Type = ACPI_TYPE_DEBUG_OBJECT;
goto Exit;
default:
ACPI_ERROR ((AE_INFO,
"Unknown Reference subtype %X",
ObjDesc->Reference.Opcode));
return_ACPI_STATUS (AE_AML_INTERNAL);
}
}
/*
* Now we are guaranteed to have an object that has not been created
* via the RefOf or Index operators.
*/
Type = ACPI_GET_OBJECT_TYPE (ObjDesc);
Exit:
/* Convert internal types to external types */
switch (Type)
{
case ACPI_TYPE_LOCAL_REGION_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
case ACPI_TYPE_LOCAL_INDEX_FIELD:
Type = ACPI_TYPE_FIELD_UNIT;
break;
case ACPI_TYPE_LOCAL_SCOPE:
/* Per ACPI Specification, Scope is untyped */
Type = ACPI_TYPE_ANY;
break;
default:
/* No change to Type required */
break;
}
*ReturnType = Type;
if (ReturnDesc)
{
*ReturnDesc = ObjDesc;
}
return_ACPI_STATUS (AE_OK);
}