nsaccess.c

acpi tools for linux include acpiexec and acpixtract

/*******************************************************************************
 *
 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
 *              $Revision: 1.209 $
 *
 ******************************************************************************/

/******************************************************************************
 *
 * 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 __NSACCESS_C__

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


#define _COMPONENT          ACPI_NAMESPACE
        ACPI_MODULE_NAME    ("nsaccess")


/*******************************************************************************
 *
 * FUNCTION:    AcpiNsRootInitialize
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Allocate and initialize the default root named objects
 *
 * MUTEX:       Locks namespace for entire execution
 *
 ******************************************************************************/

ACPI_STATUS
AcpiNsRootInitialize (
    void)
{
    ACPI_STATUS                 Status;
    const ACPI_PREDEFINED_NAMES *InitVal = NULL;
    ACPI_NAMESPACE_NODE         *NewNode;
    ACPI_OPERAND_OBJECT         *ObjDesc;
    ACPI_STRING                 Val = NULL;


    ACPI_FUNCTION_TRACE (NsRootInitialize);


    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * The global root ptr is initially NULL, so a non-NULL value indicates
     * that AcpiNsRootInitialize() has already been called; just return.
     */
    if (AcpiGbl_RootNode)
    {
        Status = AE_OK;
        goto UnlockAndExit;
    }

    /*
     * Tell the rest of the subsystem that the root is initialized
     * (This is OK because the namespace is locked)
     */
    AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct;

    /* Enter the pre-defined names in the name table */

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
        "Entering predefined entries into namespace\n"));

    for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++)
    {
        /* _OSI is optional for now, will be permanent later */

        if (!ACPI_STRCMP (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod)
        {
            continue;
        }

        Status = AcpiNsLookup (NULL, InitVal->Name, InitVal->Type,
                        ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH,
                        NULL, &NewNode);

        if (ACPI_FAILURE (Status) || (!NewNode)) /* Must be on same line for code converter */
        {
            ACPI_EXCEPTION ((AE_INFO, Status,
                "Could not create predefined name %s",
                InitVal->Name));
        }

        /*
         * Name entered successfully.
         * If entry in PreDefinedNames[] specifies an
         * initial value, create the initial value.
         */
        if (InitVal->Val)
        {
            Status = AcpiOsPredefinedOverride (InitVal, &Val);
            if (ACPI_FAILURE (Status))
            {
                ACPI_ERROR ((AE_INFO,
                    "Could not override predefined %s",
                    InitVal->Name));
            }

            if (!Val)
            {
                Val = InitVal->Val;
            }

            /*
             * Entry requests an initial value, allocate a
             * descriptor for it.
             */
            ObjDesc = AcpiUtCreateInternalObject (InitVal->Type);
            if (!ObjDesc)
            {
                Status = AE_NO_MEMORY;
                goto UnlockAndExit;
            }

            /*
             * Convert value string from table entry to
             * internal representation. Only types actually
             * used for initial values are implemented here.
             */
            switch (InitVal->Type)
            {
            case ACPI_TYPE_METHOD:
                ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val);
                ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID;

#if defined (ACPI_ASL_COMPILER)

                /* Save the parameter count for the iASL compiler */

                NewNode->Value = ObjDesc->Method.ParamCount;
#else
                /* Mark this as a very SPECIAL method */

                ObjDesc->Method.MethodFlags = AML_METHOD_INTERNAL_ONLY;

#ifndef ACPI_DUMP_APP
                ObjDesc->Method.Implementation = AcpiUtOsiImplementation;
#endif
#endif
                break;

            case ACPI_TYPE_INTEGER:

                ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val);
                break;


            case ACPI_TYPE_STRING:

                /*
                 * Build an object around the static string
                 */
                ObjDesc->String.Length = (UINT32) ACPI_STRLEN (Val);
                ObjDesc->String.Pointer = Val;
                ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
                break;


            case ACPI_TYPE_MUTEX:

                ObjDesc->Mutex.Node = NewNode;
                ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1);

                /* Create a mutex */

                Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex);
                if (ACPI_FAILURE (Status))
                {
                    AcpiUtRemoveReference (ObjDesc);
                    goto UnlockAndExit;
                }

                /* Special case for ACPI Global Lock */

                if (ACPI_STRCMP (InitVal->Name, "_GL_") == 0)
                {
                    AcpiGbl_GlobalLockMutex = ObjDesc;

                    /* Create additional counting semaphore for global lock */

                    Status = AcpiOsCreateSemaphore (
                                1, 0, &AcpiGbl_GlobalLockSemaphore);
                    if (ACPI_FAILURE (Status))
                    {
                        AcpiUtRemoveReference (ObjDesc);
                        goto UnlockAndExit;
                    }
                }
                break;


            default:

                ACPI_ERROR ((AE_INFO, "Unsupported initial type value %X",
                    InitVal->Type));
                AcpiUtRemoveReference (ObjDesc);
                ObjDesc = NULL;
                continue;
            }

            /* Store pointer to value descriptor in the Node */

            Status = AcpiNsAttachObject (NewNode, ObjDesc,
                        ACPI_GET_OBJECT_TYPE (ObjDesc));

            /* Remove local reference to the object */

            AcpiUtRemoveReference (ObjDesc);
        }
    }


UnlockAndExit:
    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    /* Save a handle to "_GPE", it is always present */

    if (ACPI_SUCCESS (Status))
    {
        Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
                    &AcpiGbl_FadtGpeDevice);
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiNsLookup
 *
 * PARAMETERS:  ScopeInfo       - Current scope info block
 *              Pathname        - Search pathname, in internal format
 *                                (as represented in the AML stream)
 *              Type            - Type associated with name
 *              InterpreterMode - IMODE_LOAD_PASS2 => add name if not found
 *              Flags           - Flags describing the search restrictions
 *              WalkState       - Current state of the walk
 *              ReturnNode      - Where the Node is placed (if found
 *                                or created successfully)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Find or enter the passed name in the name space.
 *              Log an error if name not found in Exec mode.
 *
 * MUTEX:       Assumes namespace is locked.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiNsLookup (
    ACPI_GENERIC_STATE      *ScopeInfo,
    char                    *Pathname,
    ACPI_OBJECT_TYPE        Type,
    ACPI_INTERPRETER_MODE   InterpreterMode,
    UINT32                  Flags,
    ACPI_WALK_STATE         *WalkState,
    ACPI_NAMESPACE_NODE     **ReturnNode)
{
    ACPI_STATUS             Status;
    char                    *Path = Pathname;
    ACPI_NAMESPACE_NODE     *PrefixNode;
    ACPI_NAMESPACE_NODE     *CurrentNode = NULL;
    ACPI_NAMESPACE_NODE     *ThisNode = NULL;
    UINT32                  NumSegments;
    UINT32                  NumCarats;