dsobject.c

acpi tools for linux include acpiexec and acpixtract

/******************************************************************************
 *
 * Module Name: dsobject - Dispatcher object management routines
 *              $Revision: 1.139 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 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 __DSOBJECT_C__

#include "acpi.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acnamesp.h"
#include "acinterp.h"

#define _COMPONENT          ACPI_DISPATCHER
        ACPI_MODULE_NAME    ("dsobject")

/* Local prototypes */

static ACPI_STATUS
AcpiDsBuildInternalObject (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op,
    ACPI_OPERAND_OBJECT     **ObjDescPtr);


#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
 *
 * FUNCTION:    AcpiDsBuildInternalObject
 *
 * PARAMETERS:  WalkState       - Current walk state
 *              Op              - Parser object to be translated
 *              ObjDescPtr      - Where the ACPI internal object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
 *              Simple objects are any objects other than a package object!
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiDsBuildInternalObject (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op,
    ACPI_OPERAND_OBJECT     **ObjDescPtr)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (DsBuildInternalObject);


    *ObjDescPtr = NULL;
    if (Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP)
    {
        /*
         * This is a named object reference. If this name was
         * previously looked up in the namespace, it was stored in this op.
         * Otherwise, go ahead and look it up now
         */
        if (!Op->Common.Node)
        {
            Status = AcpiNsLookup (WalkState->ScopeInfo,
                        Op->Common.Value.String,
                        ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
                        ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL,
                        ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &(Op->Common.Node)));
            if (ACPI_FAILURE (Status))
            {
                /* Check if we are resolving a named reference within a package */

                if ((Status == AE_NOT_FOUND) && (AcpiGbl_EnableInterpreterSlack) &&

                    ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
                     (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP)))
                {
                    /*
                     * We didn't find the target and we are populating elements
                     * of a package - ignore if slack enabled. Some ASL code
                     * contains dangling invalid references in packages and
                     * expects that no exception will be issued. Leave the
                     * element as a null element. It cannot be used, but it
                     * can be overwritten by subsequent ASL code - this is
                     * typically the case.
                     */
                    ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
                        "Ignoring unresolved reference in package [%4.4s]\n",
                        WalkState->ScopeInfo->Scope.Node->Name.Ascii));

                    return_ACPI_STATUS (AE_OK);
                }
                else
                {
                    ACPI_ERROR_NAMESPACE (Op->Common.Value.String, Status);
                }

                return_ACPI_STATUS (Status);
            }
        }

        /* Special object resolution for elements of a package */

        if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
            (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP))
        {
            /*
             * Attempt to resolve the node to a value before we insert it into
             * the package. If this is a reference to a common data type,
             * resolve it immediately. According to the ACPI spec, package
             * elements can only be "data objects" or method references.
             * Attempt to resolve to an Integer, Buffer, String or Package.
             * If cannot, return the named reference (for things like Devices,
             * Methods, etc.) Buffer Fields and Fields will resolve to simple
             * objects (int/buf/str/pkg).
             *
             * NOTE: References to things like Devices, Methods, Mutexes, etc.
             * will remain as named references. This behavior is not described
             * in the ACPI spec, but it appears to be an oversight.
             */
            ObjDesc = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Op->Common.Node);

            Status = AcpiExResolveNodeToValue (
                        ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ObjDesc),
                        WalkState);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }

            switch (Op->Common.Node->Type)
            {
            /*
             * For these types, we need the actual node, not the subobject.
             * However, the subobject did not get an extra reference count above.
             *
             * TBD: should ExResolveNodeToValue be changed to fix this?
             */
            case ACPI_TYPE_DEVICE:
            case ACPI_TYPE_THERMAL:

                AcpiUtAddReference (Op->Common.Node->Object);

                /*lint -fallthrough */
            /*
             * For these types, we need the actual node, not the subobject.
             * The subobject got an extra reference count in ExResolveNodeToValue.
             */
            case ACPI_TYPE_MUTEX:
            case ACPI_TYPE_METHOD:
            case ACPI_TYPE_POWER:
            case ACPI_TYPE_PROCESSOR:
            case ACPI_TYPE_EVENT:
            case ACPI_TYPE_REGION:

                /* We will create a reference object for these types below */
                break;

            default:
                /*
                 * All other types - the node was resolved to an actual
                 * object, we are done.
                 */
                goto Exit;
            }
        }
    }

    /* Create and init a new internal ACPI object */

    ObjDesc = AcpiUtCreateInternalObject (
                (AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode))->ObjectType);
    if (!ObjDesc)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    Status = AcpiDsInitObjectFromOp (WalkState, Op, Op->Common.AmlOpcode,
                &ObjDesc);
    if (ACPI_FAILURE (Status))
    {
        AcpiUtRemoveReference (ObjDesc);
        return_ACPI_STATUS (Status);
    }

Exit:
    *ObjDescPtr = ObjDesc;
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsBuildInternalBufferObj
 *
 * PARAMETERS:  WalkState       - Current walk state
 *              Op              - Parser object to be translated
 *              BufferLength    - Length of the buffer
 *              ObjDescPtr      - Where the ACPI internal object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Translate a parser Op package object to the equivalent
 *              namespace object
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDsBuildInternalBufferObj (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  BufferLength,
    ACPI_OPERAND_OBJECT     **ObjDescPtr)
{
    ACPI_PARSE_OBJECT       *Arg;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_PARSE_OBJECT       *ByteList;
    UINT32                  ByteListLength = 0;


    ACPI_FUNCTION_TRACE (DsBuildInternalBufferObj);


    /*
     * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
     * The buffer object already exists (from the NS node), otherwise it must
     * be created.
     */
    ObjDesc = *ObjDescPtr;
    if (!ObjDesc)
    {
        /* Create a new buffer object */

        ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_BUFFER);
        *ObjDescPtr = ObjDesc;
        if (!ObjDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }
    }

    /*
     * Second arg is the buffer data (optional) ByteList can be either
     * individual bytes or a string initializer.  In either case, a
     * ByteList appears in the AML.
     */
    Arg = Op->Common.Value.Arg;         /* skip first arg */

    ByteList = Arg->Named.Next;
    if (ByteList)
    {
        if (ByteList->Common.AmlOpcode != AML_INT_BYTELIST_OP)
        {
            ACPI_ERROR ((AE_INFO,
                "Expecting bytelist, got AML opcode %X in op %p",
                ByteList->Common.AmlOpcode, ByteList));

            AcpiUtRemoveReference (ObjDesc);
            return (AE_TYPE);
        }

        ByteListLength = (UINT32) ByteList->Common.Value.Integer;
    }

    /*
     * The buffer length (number of bytes) will be the larger of:
     * 1) The specified buffer length and
     * 2) The length of the initializer byte list
     */
    ObjDesc->Buffer.Length = BufferLength;
    if (ByteListLength > BufferLength)
    {
        ObjDesc->Buffer.Length = ByteListLength;
    }

    /* Allocate the buffer */

    if (ObjDesc->Buffer.Length == 0)
    {
        ObjDesc->Buffer.Pointer = NULL;
        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
            "Buffer defined with zero length in AML, creating\n"));
    }
    else
    {
        ObjDesc->Buffer.Pointer = ACPI_ALLOCATE_ZEROED (
                                        ObjDesc->Buffer.Length);
        if (!ObjDesc->Buffer.Pointer)
        {
            AcpiUtDeleteObjectDesc (ObjDesc);
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Initialize buffer from the ByteList (if present) */

        if (ByteList)
        {
            ACPI_MEMCPY (ObjDesc->Buffer.Pointer, ByteList->Named.Data,
                         ByteListLength);
        }
    }

    ObjDesc->Buffer.Flags |= AOPOBJ_DATA_VALID;
    Op->Common.Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjDesc);
    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsBuildInternalPackageObj
 *
 * PARAMETERS:  WalkState       - Current walk state
 *              Op              - Parser object to be translated
 *              ElementCount    - Number of elements in the package - this is
 *                                the NumElements argument to Package()
 *              ObjDescPtr      - Where the ACPI internal object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Translate a parser Op package object to the equivalent
 *              namespace object
 *