excreate.c

acpi tools for linux include acpiexec and acpixtract

/******************************************************************************
 *
 * Module Name: excreate - Named object creation
 *              $Revision: 1.117 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 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 __EXCREATE_C__

#include "acpi.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "acevents.h"
#include "actables.h"


#define _COMPONENT          ACPI_EXECUTER
        ACPI_MODULE_NAME    ("excreate")


#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
 *
 * FUNCTION:    AcpiExCreateAlias
 *
 * PARAMETERS:  WalkState            - Current state, contains operands
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new named alias
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExCreateAlias (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_NAMESPACE_NODE     *TargetNode;
    ACPI_NAMESPACE_NODE     *AliasNode;
    ACPI_STATUS             Status = AE_OK;


    ACPI_FUNCTION_TRACE (ExCreateAlias);


    /* Get the source/alias operands (both namespace nodes) */

    AliasNode =  (ACPI_NAMESPACE_NODE *) WalkState->Operands[0];
    TargetNode = (ACPI_NAMESPACE_NODE *) WalkState->Operands[1];

    if ((TargetNode->Type == ACPI_TYPE_LOCAL_ALIAS)  ||
        (TargetNode->Type == ACPI_TYPE_LOCAL_METHOD_ALIAS))
    {
        /*
         * Dereference an existing alias so that we don't create a chain
         * of aliases.  With this code, we guarantee that an alias is
         * always exactly one level of indirection away from the
         * actual aliased name.
         */
        TargetNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, TargetNode->Object);
    }

    /*
     * For objects that can never change (i.e., the NS node will
     * permanently point to the same object), we can simply attach
     * the object to the new NS node.  For other objects (such as
     * Integers, buffers, etc.), we have to point the Alias node
     * to the original Node.
     */
    switch (TargetNode->Type)
    {

    /* For these types, the sub-object can change dynamically via a Store */

    case ACPI_TYPE_INTEGER:
    case ACPI_TYPE_STRING:
    case ACPI_TYPE_BUFFER:
    case ACPI_TYPE_PACKAGE:
    case ACPI_TYPE_BUFFER_FIELD:

    /*
     * These types open a new scope, so we need the NS node in order to access
     * any children.
     */
    case ACPI_TYPE_DEVICE:
    case ACPI_TYPE_POWER:
    case ACPI_TYPE_PROCESSOR:
    case ACPI_TYPE_THERMAL:
    case ACPI_TYPE_LOCAL_SCOPE:

        /*
         * The new alias has the type ALIAS and points to the original
         * NS node, not the object itself.
         */
        AliasNode->Type = ACPI_TYPE_LOCAL_ALIAS;
        AliasNode->Object = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, TargetNode);
        break;

    case ACPI_TYPE_METHOD:

        /*
         * Control method aliases need to be differentiated
         */
        AliasNode->Type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
        AliasNode->Object = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, TargetNode);
        break;

    default:

        /* Attach the original source object to the new Alias Node */

        /*
         * The new alias assumes the type of the target, and it points
         * to the same object.  The reference count of the object has an
         * additional reference to prevent deletion out from under either the
         * target node or the alias Node
         */
        Status = AcpiNsAttachObject (AliasNode,
                    AcpiNsGetAttachedObject (TargetNode), TargetNode->Type);
        break;
    }

    /* Since both operands are Nodes, we don't need to delete them */

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExCreateEvent
 *
 * PARAMETERS:  WalkState           - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new event object
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExCreateEvent (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     *ObjDesc;


    ACPI_FUNCTION_TRACE (ExCreateEvent);


    ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_EVENT);
    if (!ObjDesc)
    {
        Status = AE_NO_MEMORY;
        goto Cleanup;
    }

    /*
     * Create the actual OS semaphore, with zero initial units -- meaning
     * that the event is created in an unsignalled state
     */
    Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0,
                &ObjDesc->Event.OsSemaphore);
    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    /* Attach object to the Node */

    Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) WalkState->Operands[0],
                ObjDesc, ACPI_TYPE_EVENT);

Cleanup:
    /*
     * Remove local reference to the object (on error, will cause deletion
     * of both object and semaphore if present.)
     */
    AcpiUtRemoveReference (ObjDesc);
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExCreateMutex
 *
 * PARAMETERS:  WalkState           - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new mutex object
 *
 *              Mutex (Name[0], SyncLevel[1])
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExCreateMutex (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *ObjDesc;


    ACPI_FUNCTION_TRACE_PTR (ExCreateMutex, ACPI_WALK_OPERANDS);