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/******************************************************************************

 *

 * Module Name: asllookup- Namespace lookup

 *

 *****************************************************************************/

/******************************************************************************

 *

 * 1. Copyright Notice

 *

 * Some or all of this work - Copyright (c) 1999 - 2010, 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.

 *

 *****************************************************************************/

#include "aslcompiler.h"

#include "aslcompiler.y.h"

#include "acparser.h"

#include "amlcode.h"

#include "acnamesp.h"

#include "acdispat.h"

#define _COMPONENT          ACPI_COMPILER

        ACPI_MODULE_NAME    ("asllookup")

/* Local prototypes */

static ACPI_STATUS

LsCompareOneNamespaceObject (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue);

static ACPI_STATUS

LsDoOneNamespaceObject (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue);

static BOOLEAN

LkObjectExists (

    char                    *Name);

static void

LkCheckFieldRange (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  RegionBitLength,

    UINT32                  FieldBitOffset,

    UINT32                  FieldBitLength,

    UINT32                  AccessBitWidth);

static ACPI_STATUS

LkNamespaceLocateBegin (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context);

static ACPI_STATUS

LkNamespaceLocateEnd (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context);

static ACPI_STATUS

LkIsObjectUsed (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue);

static ACPI_STATUS

LsDoOnePathname (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue);

void

LsSetupNsList (

    void                    *Handle);

ACPI_PARSE_OBJECT *

LkGetNameOp (

    ACPI_PARSE_OBJECT       *Op);

/*******************************************************************************

 *

 * FUNCTION:    LsDoOneNamespaceObject

 *

 * PARAMETERS:  ACPI_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Dump a namespace object to the namespace output file.

 *              Called during the walk of the namespace to dump all objects.

 *

 ******************************************************************************/

static ACPI_STATUS

LsDoOneNamespaceObject (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue)

{

    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;

    ACPI_OPERAND_OBJECT     *ObjDesc;

    ACPI_PARSE_OBJECT       *Op;

    Gbl_NumNamespaceObjects++;

    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "%5u  [%u]  %*s %4.4s - %s",

        Gbl_NumNamespaceObjects, Level, (Level * 3), " ",

        &Node->Name,

        AcpiUtGetTypeName (Node->Type));

    Op = Node->Op;

    ObjDesc = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Node->Object);

    if (!Op)

    {

        FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "\n");

        return (AE_OK);

    }

    if ((ObjDesc) &&

        (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc) == ACPI_DESC_TYPE_OPERAND))

    {

        switch (Node->Type)

        {

        case ACPI_TYPE_INTEGER:

            FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                "       [Initial Value   0x%8.8X%8.8X]",

                ACPI_FORMAT_UINT64 (ObjDesc->Integer.Value));

            break;

        case ACPI_TYPE_STRING:

            FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                "        [Initial Value   \"%s\"]",

                ObjDesc->String.Pointer);

            break;

        default:

            /* Nothing to do for other types */

            break;

        }

    }

    else

    {

        switch (Node->Type)

        {

        case ACPI_TYPE_INTEGER:

            if (Op->Asl.ParseOpcode == PARSEOP_NAME)

            {

                Op = Op->Asl.Child;

            }

            if ((Op->Asl.ParseOpcode == PARSEOP_NAMESEG)  ||

                (Op->Asl.ParseOpcode == PARSEOP_NAMESTRING))

            {

                Op = Op->Asl.Next;

            }

            FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                "       [Initial Value   0x%8.8X%8.8X]",

                ACPI_FORMAT_UINT64 (Op->Asl.Value.Integer));

            break;

        case ACPI_TYPE_STRING:

            if (Op->Asl.ParseOpcode == PARSEOP_NAME)

            {

                Op = Op->Asl.Child;

            }

            if ((Op->Asl.ParseOpcode == PARSEOP_NAMESEG)  ||

                (Op->Asl.ParseOpcode == PARSEOP_NAMESTRING))

            {

                Op = Op->Asl.Next;

            }

            FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                "        [Initial Value   \"%s\"]",

                Op->Asl.Value.String);

            break;

        case ACPI_TYPE_LOCAL_REGION_FIELD:

            if ((Op->Asl.ParseOpcode == PARSEOP_NAMESEG)  ||

                (Op->Asl.ParseOpcode == PARSEOP_NAMESTRING))

            {

                Op = Op->Asl.Child;

            }

            FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                "   [Offset 0x%04X   Length 0x%04X bits]",

                Op->Asl.Parent->Asl.ExtraValue, (UINT32) Op->Asl.Value.Integer);

            break;

        case ACPI_TYPE_BUFFER_FIELD:

            switch (Op->Asl.ParseOpcode)

            {

            case PARSEOP_CREATEBYTEFIELD:

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "   [BYTE  ( 8 bit)]");

                break;

            case PARSEOP_CREATEDWORDFIELD:

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "   [DWORD (32 bit)]");

                break;

            case PARSEOP_CREATEQWORDFIELD:

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "   [QWORD (64 bit)]");

                break;

            case PARSEOP_CREATEWORDFIELD:

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "   [WORD  (16 bit)]");

                break;

            case PARSEOP_CREATEBITFIELD:

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "   [BIT   ( 1 bit)]");

                break;

            case PARSEOP_CREATEFIELD:

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "   [Arbitrary Bit Field]");

                break;

            default:

                break;

            }

            break;

        case ACPI_TYPE_PACKAGE:

            if (Op->Asl.ParseOpcode == PARSEOP_NAME)

            {

                Op = Op->Asl.Child;

            }

            if ((Op->Asl.ParseOpcode == PARSEOP_NAMESEG)  ||

                (Op->Asl.ParseOpcode == PARSEOP_NAMESTRING))

            {

                Op = Op->Asl.Next;

            }

            Op = Op->Asl.Child;

            if ((Op->Asl.ParseOpcode == PARSEOP_BYTECONST) ||

                (Op->Asl.ParseOpcode == PARSEOP_RAW_DATA))

            {

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                    "       [Initial Length  0x%.2X elements]",

                    Op->Asl.Value.Integer);

            }

            break;

        case ACPI_TYPE_BUFFER:

            if (Op->Asl.ParseOpcode == PARSEOP_NAME)

            {

                Op = Op->Asl.Child;

            }

            if ((Op->Asl.ParseOpcode == PARSEOP_NAMESEG)  ||

                (Op->Asl.ParseOpcode == PARSEOP_NAMESTRING))

            {

                Op = Op->Asl.Next;

            }

            Op = Op->Asl.Child;

            if (Op && (Op->Asl.ParseOpcode == PARSEOP_INTEGER))

            {

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                    "        [Initial Length  0x%.2X bytes]",

                    Op->Asl.Value.Integer);

            }

            break;

        case ACPI_TYPE_METHOD:

            FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                "        [Code Length     0x%.4X bytes]",

                Op->Asl.AmlSubtreeLength);

            break;

        case ACPI_TYPE_LOCAL_RESOURCE:

            FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                "  [Desc Offset     0x%.4X Bytes]", Node->Value);

            break;

        case ACPI_TYPE_LOCAL_RESOURCE_FIELD:

            if (Node->Flags & 0x80)

            {

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                    "   [Field Offset    0x%.4X Bits 0x%.4X Bytes]",

                    Node->Value, Node->Value / 8);

            }

            else

            {

                FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT,

                    "   [Field Offset    0x%.4X Bytes]", Node->Value);

            }

            break;

        default:

            /* Nothing to do for other types */

            break;

        }

    }

    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "\n");

    return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    LsSetupNsList

 *

 * PARAMETERS:  Handle          - local file handle

 *

 * RETURN:      None

 *

 * DESCRIPTION: Set the namespace output file to the input handle

 *

 ******************************************************************************/

void

LsSetupNsList (

    void                    *Handle)

{

    Gbl_NsOutputFlag = TRUE;

    Gbl_Files[ASL_FILE_NAMESPACE_OUTPUT].Handle = Handle;

}

/*******************************************************************************

 *

 * FUNCTION:    LsDoOnePathname

 *

 * PARAMETERS:  ACPI_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Print the full pathname for a namespace node.

 *

 ******************************************************************************/

static ACPI_STATUS

LsDoOnePathname (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue)

{

    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;

    ACPI_STATUS             Status;

    ACPI_BUFFER             TargetPath;

    TargetPath.Length = ACPI_ALLOCATE_LOCAL_BUFFER;

    Status = AcpiNsHandleToPathname (Node, &TargetPath);

    if (ACPI_FAILURE (Status))

    {

        return (Status);

    }

    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "%s\n", TargetPath.Pointer);

    ACPI_FREE (TargetPath.Pointer);

    return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    LsDisplayNamespace

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Walk the namespace an display information about each node

 *              in the tree.  Information is written to the optional

 *              namespace output file.

 *

 ******************************************************************************/

ACPI_STATUS

LsDisplayNamespace (

    void)

{

    ACPI_STATUS             Status;

    if (!Gbl_NsOutputFlag)

    {

        return (AE_OK);

    }

    Gbl_NumNamespaceObjects = 0;

    /* File header */

    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "Contents of ACPI Namespace\n\n");

    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "Count  Depth    Name - Type\n\n");

    /* Walk entire namespace from the root */

    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,

                ACPI_UINT32_MAX, FALSE, LsDoOneNamespaceObject, NULL,

                NULL, NULL);

    /* Print the full pathname for each namespace node */

    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "\nNamespace pathnames\n\n");

    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,

                ACPI_UINT32_MAX, FALSE, LsDoOnePathname, NULL,

                NULL, NULL);

    return (Status);

}

/*******************************************************************************

 *

 * FUNCTION:    LsCompareOneNamespaceObject

 *

 * PARAMETERS:  ACPI_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Compare name of one object.

 *

 ******************************************************************************/

static ACPI_STATUS

LsCompareOneNamespaceObject (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue)

{

    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;

    /* Simply check the name */

    if (*((UINT32 *) (Context)) == Node->Name.Integer)

    {

        /* Abort walk if we found one instance */

        return (AE_CTRL_TRUE);

    }

    return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    LkObjectExists

 *

 * PARAMETERS:  Name            - 4 char ACPI name

 *

 * RETURN:      TRUE if name exists in namespace

 *

 * DESCRIPTION: Walk the namespace to find an object

 *

 ******************************************************************************/

static BOOLEAN

LkObjectExists (

    char                    *Name)

{

    ACPI_STATUS             Status;

    /* Walk entire namespace from the supplied root */

    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,

                ACPI_UINT32_MAX, FALSE, LsCompareOneNamespaceObject, NULL,

                Name, NULL);

    if (Status == AE_CTRL_TRUE)

    {

        /* At least one instance of the name was found */

        return (TRUE);

    }

    return (FALSE);

}

/*******************************************************************************

 *

 * FUNCTION:    LkGetNameOp

 *

 * PARAMETERS:  Op              - Current Op

 *

 * RETURN:      NameOp associated with the input op

 *

 * DESCRIPTION: Find the name declaration op associated with the operator

 *

 ******************************************************************************/

ACPI_PARSE_OBJECT *

LkGetNameOp (

    ACPI_PARSE_OBJECT       *Op)

{

    const ACPI_OPCODE_INFO  *OpInfo;

    ACPI_PARSE_OBJECT       *NameOp = Op;

    OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);

    /* Get the NamePath from the appropriate place */

    if (OpInfo->Flags & AML_NAMED)

    {

        /* For nearly all NAMED operators, the name reference is the first child */

        NameOp = Op->Asl.Child;

        if (Op->Asl.AmlOpcode == AML_ALIAS_OP)

        {

            /*

             * ALIAS is the only oddball opcode, the name declaration

             * (alias name) is the second operand

             */

            NameOp = Op->Asl.Child->Asl.Next;

        }

    }

    else if (OpInfo->Flags & AML_CREATE)

    {

        /* Name must appear as the last parameter */

        NameOp = Op->Asl.Child;

        while (!(NameOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))

        {

            NameOp = NameOp->Asl.Next;

        }

    }

    return (NameOp);

}

/*******************************************************************************

 *

 * FUNCTION:    LkIsObjectUsed

 *

 * PARAMETERS:  ACPI_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Check for an unreferenced namespace object and emit a warning.

 *              We have to be careful, because some types and names are

 *              typically or always unreferenced, we don't want to issue

 *              excessive warnings.

 *

 ******************************************************************************/

static ACPI_STATUS

LkIsObjectUsed (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue)

{

    ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);

    /* Referenced flag is set during the namespace xref */

    if (Node->Flags & ANOBJ_IS_REFERENCED)

    {

        return (AE_OK);

    }

    /*

     * Ignore names that start with an underscore,

     * these are the reserved ACPI names and are typically not referenced,

     * they are called by the host OS.

     */

    if (Node->Name.Ascii[0] == '_')

    {

        return (AE_OK);

    }

    /* There are some types that are typically not referenced, ignore them */

    switch (Node->Type)

    {

    case ACPI_TYPE_DEVICE:

    case ACPI_TYPE_PROCESSOR:

    case ACPI_TYPE_POWER:

    case ACPI_TYPE_LOCAL_RESOURCE:

        return (AE_OK);

    default:

        break;

    }

    /* All others are valid unreferenced namespace objects */

    if (Node->Op)

    {

        AslError (ASL_WARNING2, ASL_MSG_NOT_REFERENCED, LkGetNameOp (Node->Op), NULL);

    }

    return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    LkFindUnreferencedObjects

 *

 * PARAMETERS:  None

 *

 * RETURN:      None

 *

 * DESCRIPTION: Namespace walk to find objects that are not referenced in any

 *              way. Must be called after the namespace has been cross

 *              referenced.

 *

 ******************************************************************************/

void

LkFindUnreferencedObjects (

    void)

{

    /* Walk entire namespace from the supplied root */

    (void) AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,

                ACPI_UINT32_MAX, FALSE, LkIsObjectUsed, NULL,

                NULL, NULL);

}

/*******************************************************************************

 *

 * FUNCTION:    LkCrossReferenceNamespace

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Perform a cross reference check of the parse tree against the

 *              namespace.  Every named referenced within the parse tree

 *              should be get resolved with a namespace lookup.  If not, the

 *              original reference in the ASL code is invalid -- i.e., refers

 *              to a non-existent object.

 *

 * NOTE:  The ASL "External" operator causes the name to be inserted into the

 *        namespace so that references to the external name will be resolved

 *        correctly here.

 *

 ******************************************************************************/

ACPI_STATUS

LkCrossReferenceNamespace (

    void)

{

    ACPI_WALK_STATE         *WalkState;

    DbgPrint (ASL_DEBUG_OUTPUT, "\nCross referencing namespace\n\n");

    /*

     * Create a new walk state for use when looking up names

     * within the namespace (Passed as context to the callbacks)

     */

    WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);

    if (!WalkState)

    {

        return AE_NO_MEMORY;

    }

    /* Walk the entire parse tree */

    TrWalkParseTree (RootNode, ASL_WALK_VISIT_TWICE, LkNamespaceLocateBegin,

                        LkNamespaceLocateEnd, WalkState);

    return AE_OK;

}

/*******************************************************************************

 *

 * FUNCTION:    LkCheckFieldRange

 *

 * PARAMETERS:  RegionBitLength     - Length of entire parent region

 *              FieldBitOffset      - Start of the field unit (within region)

 *              FieldBitLength      - Entire length of field unit

 *              AccessBitWidth      - Access width of the field unit

 *

 * RETURN:      None

 *

 * DESCRIPTION: Check one field unit to make sure it fits in the parent

 *              op region.

 *

 * Note: AccessBitWidth must be either 8,16,32, or 64

 *

 ******************************************************************************/

static void

LkCheckFieldRange (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  RegionBitLength,

    UINT32                  FieldBitOffset,

    UINT32                  FieldBitLength,

    UINT32                  AccessBitWidth)

{

    UINT32                  FieldEndBitOffset;

    /*

     * Check each field unit against the region size.  The entire

     * field unit (start offset plus length) must fit within the

     * region.

     */

    FieldEndBitOffset = FieldBitOffset + FieldBitLength;

    if (FieldEndBitOffset > RegionBitLength)

    {

        /* Field definition itself is beyond the end-of-region */

        AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_OFFSET, Op, NULL);

        return;

    }

    /*

     * Now check that the field plus AccessWidth doesn't go beyond

     * the end-of-region.  Assumes AccessBitWidth is a power of 2

     */

    FieldEndBitOffset = ACPI_ROUND_UP (FieldEndBitOffset, AccessBitWidth);

    if (FieldEndBitOffset > RegionBitLength)

    {

        /* Field definition combined with the access is beyond EOR */

        AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_ACCESS_WIDTH, Op, NULL);

    }

}

/*******************************************************************************

 *

 * FUNCTION:    LkNamespaceLocateBegin

 *

 * PARAMETERS:  ASL_WALK_CALLBACK

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Descending callback used during cross-reference.  For named

 *              object references, attempt to locate the name in the

 *              namespace.

 *

 * NOTE: ASL references to named fields within resource descriptors are

 *       resolved to integer values here.  Therefore, this step is an

 *       important part of the code generation.  We don't know that the

 *       name refers to a resource descriptor until now.

 *

 ******************************************************************************/

static ACPI_STATUS

LkNamespaceLocateBegin (

    ACPI_PARSE_OBJECT       *Op,

    UINT32                  Level,

    void                    *Context)

{

    ACPI_WALK_STATE         *WalkState = (ACPI_WALK_STATE *) Context;

    ACPI_NAMESPACE_NODE     *Node;

    ACPI_STATUS             Status;

    ACPI_OBJECT_TYPE        ObjectType;

    char                    *Path;

    UINT8                   PassedArgs;

    ACPI_PARSE_OBJECT       *NextOp;

    ACPI_PARSE_OBJECT       *OwningOp;

    ACPI_PARSE_OBJECT       *SpaceIdOp;

    UINT32                  MinimumLength;

    UINT32                  Temp;

    const ACPI_OPCODE_INFO  *OpInfo;

    UINT32                  Flags;

    ACPI_FUNCTION_TRACE_PTR (LkNamespaceLocateBegin, Op);

    /*

     * If this node is the actual declaration of a name

     * [such as the XXXX name in "Method (XXXX)"],

     * we are not interested in it here.  We only care about names that are

     * references to other objects within the namespace and the parent objects

     * of name declarations

     */

    if (Op->Asl.CompileFlags & NODE_IS_NAME_DECLARATION)

    {

        return (AE_OK);

    }

    /* We are only interested in opcodes that have an associated name */

    OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);

    if ((!(OpInfo->Flags & AML_NAMED)) &&

        (!(OpInfo->Flags & AML_CREATE)) &&

        (Op->Asl.ParseOpcode != PARSEOP_NAMESTRING) &&

        (Op->Asl.ParseOpcode != PARSEOP_NAMESEG)    &&

        (Op->Asl.ParseOpcode != PARSEOP_METHODCALL))

    {

        return (AE_OK);

    }

    /*

     * One special case: CondRefOf operator - we don't care if the name exists

     * or not at this point, just ignore it, the point of the operator is to

     * determine if the name exists at runtime.

     */

    if ((Op->Asl.Parent) &&

        (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF))

    {

        return (AE_OK);

    }

    /*

     * We must enable the "search-to-root" for single NameSegs, but

     * we have to be very careful about opening up scopes

     */

    Flags = ACPI_NS_SEARCH_PARENT;

    if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) ||

        (Op->Asl.ParseOpcode == PARSEOP_NAMESEG)    ||

        (Op->Asl.ParseOpcode == PARSEOP_METHODCALL))

    {

        /*

         * These are name references, do not push the scope stack

         * for them.

         */

        Flags |= ACPI_NS_DONT_OPEN_SCOPE;

    }

    /* Get the NamePath from the appropriate place */

    if (OpInfo->Flags & AML_NAMED)

    {

        /* For nearly all NAMED operators, the name reference is the first child */

        Path = Op->Asl.Child->Asl.Value.String;

        if (Op->Asl.AmlOpcode == AML_ALIAS_OP)

        {

            /*

             * ALIAS is the only oddball opcode, the name declaration

             * (alias name) is the second operand

             */

            Path = Op->Asl.Child->Asl.Next->Asl.Value.String;

        }

    }

    else if (OpInfo->Flags & AML_CREATE)

    {

        /* Name must appear as the last parameter */

        NextOp = Op->Asl.Child;

        while (!(NextOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))

        {

            NextOp = NextOp->Asl.Next;

        }

        Path = NextOp->Asl.Value.String;

    }

    else

    {

        Path = Op->Asl.Value.String;

    }

    ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode);

    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,

        "Type=%s\n", AcpiUtGetTypeName (ObjectType)));

    /*

     * Lookup the name in the namespace.  Name must exist at this point, or it

     * is an invalid reference.

     *

     * The namespace is also used as a lookup table for references to resource

     * descriptors and the fields within them.

     */

    Gbl_NsLookupCount++;

    Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType,

                ACPI_IMODE_EXECUTE, Flags, WalkState, &(Node));

    if (ACPI_FAILURE (Status))

    {

        if (Status == AE_NOT_FOUND)

        {

            /*

             * We didn't find the name reference by path -- we can qualify this

             * a little better before we print an error message

             */

            if (strlen (Path) == ACPI_NAME_SIZE)

            {

                /* A simple, one-segment ACPI name */

                if (LkObjectExists (Path))

                {

                    /*

                     * There exists such a name, but we couldn't get to it

                     * from this scope

                     */

                    AslError (ASL_ERROR, ASL_MSG_NOT_REACHABLE, Op,

                        Op->Asl.ExternalName);

                }

                else

                {

                    /* The name doesn't exist, period */

                    AslError (ASL_ERROR, ASL_MSG_NOT_EXIST,

                        Op, Op->Asl.ExternalName);

                }

            }

            else

            {

                /* Check for a fully qualified path */

                if (Path[0] == AML_ROOT_PREFIX)

                {

                    /* Gave full path, the object does not exist */

                    AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, Op,

                        Op->Asl.ExternalName);

                }

                else

                {

                    /*

                     * We can't tell whether it doesn't exist or just

                     * can't be reached.

                     */

                    AslError (ASL_ERROR, ASL_MSG_NOT_FOUND, Op,

                        Op->Asl.ExternalName);

                }

            }

            Status = AE_OK;

        }

        return (Status);

    }

    /* Check for a reference vs. name declaration */

    if (!(OpInfo->Flags & AML_NAMED) &&

        !(OpInfo->Flags & AML_CREATE))

    {

        /* This node has been referenced, mark it for reference check */

        Node->Flags |= ANOBJ_IS_REFERENCED;

    }

    /* Attempt to optimize the NamePath */

    OptOptimizeNamePath (Op, OpInfo->Flags, WalkState, Path, Node);

    /*

     * 1) Dereference an alias (A name reference that is an alias)

     *    Aliases are not nested, the alias always points to the final object

     */

    if ((Op->Asl.ParseOpcode != PARSEOP_ALIAS) &&

        (Node->Type == ACPI_TYPE_LOCAL_ALIAS))

    {

        /* This node points back to the original PARSEOP_ALIAS */

        NextOp = Node->Op;

        /* The first child is the alias target op */

        NextOp = NextOp->Asl.Child;

        /* That in turn points back to original target alias node */

        if (NextOp->Asl.Node)

        {

            Node = NextOp->Asl.Node;

        }

        /* Else - forward reference to alias, will be resolved later */

    }

    /* 2) Check for a reference to a resource descriptor */

    if ((Node->Type == ACPI_TYPE_LOCAL_RESOURCE_FIELD) ||

             (Node->Type == ACPI_TYPE_LOCAL_RESOURCE))

    {

        /*

         * This was a reference to a field within a resource descriptor.  Extract

         * the associated field offset (either a bit or byte offset depending on

         * the field type) and change the named reference into an integer for

         * AML code generation

         */

        Temp = Node->Value;

        if (Node->Flags & ANOBJ_IS_BIT_OFFSET)

        {

            Op->Asl.CompileFlags |= NODE_IS_BIT_OFFSET;

        }

        /* Perform BitOffset <--> ByteOffset conversion if necessary */

        switch (Op->Asl.Parent->Asl.AmlOpcode)

        {

        case AML_CREATE_FIELD_OP:

            /* We allow a Byte offset to Bit Offset conversion for this op */

            if (!(Op->Asl.CompileFlags & NODE_IS_BIT_OFFSET))

            {

                /* Simply multiply byte offset times 8 to get bit offset */