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 /******************************************************************************
  *
  * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
  *                        parents and siblings and Scope manipulation
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2024, 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.
  *
  *****************************************************************************
  *
  * Alternatively, you may choose to be licensed under the terms of the
  * following license:
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions, and the following disclaimer,
  *    without modification.
  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  *    substantially similar to the "NO WARRANTY" disclaimer below
  *    ("Disclaimer") and any redistribution must be conditioned upon
  *    including a substantially similar Disclaimer requirement for further
  *    binary redistribution.
  * 3. Neither the names of the above-listed copyright holders nor the names
  *    of any contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Alternatively, you may choose to be licensed under the terms of the
  * GNU General Public License ("GPL") version 2 as published by the Free
  * Software Foundation.
  *
  *****************************************************************************/
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acnamesp.h"
 #include "amlcode.h"
 
 #define _COMPONENT          ACPI_NAMESPACE
         ACPI_MODULE_NAME    ("nsutils")
 
 /* Local prototypes */
 
 #ifdef ACPI_OBSOLETE_FUNCTIONS
 ACPI_NAME
 AcpiNsFindParentName (
     ACPI_NAMESPACE_NODE     *NodeToSearch);
 #endif
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsPrintNodePathname
  *
  * PARAMETERS:  Node            - Object
  *              Message         - Prefix message
  *
  * DESCRIPTION: Print an object's full namespace pathname
  *              Manages allocation/freeing of a pathname buffer
  *
  ******************************************************************************/
 
 void
 AcpiNsPrintNodePathname (
     ACPI_NAMESPACE_NODE     *Node,
     const char              *Message)
 {
     ACPI_BUFFER             Buffer;
     ACPI_STATUS             Status;
 
 
     if (!Node)
     {
         AcpiOsPrintf ("[NULL NAME]");
         return;
     }
 
     /* Convert handle to full pathname and print it (with supplied message) */
 
     Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
 
     Status = AcpiNsHandleToPathname (Node, &Buffer, TRUE);
     if (ACPI_SUCCESS (Status))
     {
         if (Message)
         {
             AcpiOsPrintf ("%s ", Message);
         }
 
         AcpiOsPrintf ("%s", (char *) Buffer.Pointer);
         ACPI_FREE (Buffer.Pointer);
     }
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetType
  *
  * PARAMETERS:  Node        - Parent Node to be examined
  *
  * RETURN:      Type field from Node whose handle is passed
  *
  * DESCRIPTION: Return the type of a Namespace node
  *
  ******************************************************************************/
 
 ACPI_OBJECT_TYPE
 AcpiNsGetType (
     ACPI_NAMESPACE_NODE     *Node)
 {
     ACPI_FUNCTION_TRACE (NsGetType);
 
 
     if (!Node)
     {
         ACPI_WARNING ((AE_INFO, "Null Node parameter"));
         return_UINT8 (ACPI_TYPE_ANY);
     }
 
     return_UINT8 (Node->Type);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsLocal
  *
  * PARAMETERS:  Type        - A namespace object type
  *
  * RETURN:      LOCAL if names must be found locally in objects of the
  *              passed type, 0 if enclosing scopes should be searched
  *
  * DESCRIPTION: Returns scope rule for the given object type.
  *
  ******************************************************************************/
 
 UINT32
 AcpiNsLocal (
     ACPI_OBJECT_TYPE        Type)
 {
     ACPI_FUNCTION_TRACE (NsLocal);
 
 
     if (!AcpiUtValidObjectType (Type))
     {
         /* Type code out of range  */
 
         ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
         return_UINT32 (ACPI_NS_NORMAL);
     }
 
     return_UINT32 (AcpiGbl_NsProperties[Type] & ACPI_NS_LOCAL);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetInternalNameLength
  *
  * PARAMETERS:  Info            - Info struct initialized with the
  *                                external name pointer.
  *
  * RETURN:      None
  *
  * DESCRIPTION: Calculate the length of the internal (AML) namestring
  *              corresponding to the external (ASL) namestring.
  *
  ******************************************************************************/
 
 void
 AcpiNsGetInternalNameLength (
     ACPI_NAMESTRING_INFO    *Info)
 {
     const char              *NextExternalChar;
     UINT32                  i;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     NextExternalChar = Info->ExternalName;
     Info->NumCarats = 0;
     Info->NumSegments = 0;
     Info->FullyQualified = FALSE;
 
     /*
      * For the internal name, the required length is 4 bytes per segment,
      * plus 1 each for RootPrefix, MultiNamePrefixOp, segment count,
      * trailing null (which is not really needed, but no there's harm in
      * putting it there)
      *
      * strlen() + 1 covers the first NameSeg, which has no path separator
      */
     if (ACPI_IS_ROOT_PREFIX (*NextExternalChar))
     {
         Info->FullyQualified = TRUE;
         NextExternalChar++;
 
         /* Skip redundant RootPrefix, like \\_SB.PCI0.SBRG.EC0 */
 
         while (ACPI_IS_ROOT_PREFIX (*NextExternalChar))
         {
             NextExternalChar++;
         }
     }
     else
     {
         /* Handle Carat prefixes */
 
         while (ACPI_IS_PARENT_PREFIX (*NextExternalChar))
         {
             Info->NumCarats++;
             NextExternalChar++;
         }
     }
 
     /*
      * Determine the number of ACPI name "segments" by counting the number of
      * path separators within the string. Start with one segment since the
      * segment count is [(# separators) + 1], and zero separators is ok.
      */
     if (*NextExternalChar)
     {
         Info->NumSegments = 1;
         for (i = 0; NextExternalChar[i]; i++)
         {
             if (ACPI_IS_PATH_SEPARATOR (NextExternalChar[i]))
             {
                 Info->NumSegments++;
             }
         }
     }
 
     Info->Length = (ACPI_NAMESEG_SIZE * Info->NumSegments) +
         4 + Info->NumCarats;
 
     Info->NextExternalChar = NextExternalChar;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsBuildInternalName
  *
  * PARAMETERS:  Info            - Info struct fully initialized
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Construct the internal (AML) namestring
  *              corresponding to the external (ASL) namestring.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsBuildInternalName (
     ACPI_NAMESTRING_INFO    *Info)
 {
     UINT32                  NumSegments = Info->NumSegments;
     char                    *InternalName = Info->InternalName;
     const char              *ExternalName = Info->NextExternalChar;
     char                    *Result = NULL;
     UINT32                  i;
 
 
     ACPI_FUNCTION_TRACE (NsBuildInternalName);
 
 
     /* Setup the correct prefixes, counts, and pointers */
 
     if (Info->FullyQualified)
     {
         InternalName[0] = AML_ROOT_PREFIX;
 
         if (NumSegments <= 1)
         {
             Result = &InternalName[1];
         }
         else if (NumSegments == 2)
         {
             InternalName[1] = AML_DUAL_NAME_PREFIX;
             Result = &InternalName[2];
         }
         else
         {
             InternalName[1] = AML_MULTI_NAME_PREFIX;
             InternalName[2] = (char) NumSegments;
             Result = &InternalName[3];
         }
     }
     else
     {
         /*
          * Not fully qualified.
          * Handle Carats first, then append the name segments
          */
         i = 0;
         if (Info->NumCarats)
         {
             for (i = 0; i < Info->NumCarats; i++)
             {
                 InternalName[i] = AML_PARENT_PREFIX;
             }
         }
 
         if (NumSegments <= 1)
         {
             Result = &InternalName[i];
         }
         else if (NumSegments == 2)
         {
             InternalName[i] = AML_DUAL_NAME_PREFIX;
             Result = &InternalName[(ACPI_SIZE) i+1];
         }
         else
         {
             InternalName[i] = AML_MULTI_NAME_PREFIX;
             InternalName[(ACPI_SIZE) i+1] = (char) NumSegments;
             Result = &InternalName[(ACPI_SIZE) i+2];
         }
     }
 
     /* Build the name (minus path separators) */
 
     for (; NumSegments; NumSegments--)
     {
         for (i = 0; i < ACPI_NAMESEG_SIZE; i++)
         {
             if (ACPI_IS_PATH_SEPARATOR (*ExternalName) ||
                (*ExternalName == 0))
             {
                 /* Pad the segment with underscore(s) if segment is short */
 
                 Result[i] = '_';
             }
             else
             {
                 /* Convert the character to uppercase and save it */
 
                 Result[i] = (char) toupper ((int) *ExternalName);
                 ExternalName++;
             }
         }
 
         /* Now we must have a path separator, or the pathname is bad */
 
         if (!ACPI_IS_PATH_SEPARATOR (*ExternalName) &&
             (*ExternalName != 0))
         {
             return_ACPI_STATUS (AE_BAD_PATHNAME);
         }
 
         /* Move on the next segment */
 
         ExternalName++;
         Result += ACPI_NAMESEG_SIZE;
     }
 
     /* Terminate the string */
 
     *Result = 0;
 
     if (Info->FullyQualified)
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n",
             InternalName, InternalName));
     }
     else
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
             InternalName, InternalName));
     }
 
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsInternalizeName
  *
  * PARAMETERS:  *ExternalName           - External representation of name
  *              **Converted Name        - Where to return the resulting
  *                                        internal representation of the name
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
  *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
  *
  *******************************************************************************/
 
 ACPI_STATUS
 AcpiNsInternalizeName (
     const char              *ExternalName,
     char                    **ConvertedName)
 {
     char                    *InternalName;
     ACPI_NAMESTRING_INFO    Info;
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (NsInternalizeName);
 
 
     if ((!ExternalName)      ||
         (*ExternalName == 0) ||
         (!ConvertedName))
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Get the length of the new internal name */
 
     Info.ExternalName = ExternalName;
     AcpiNsGetInternalNameLength (&Info);
 
     /* We need a segment to store the internal  name */
 
     InternalName = ACPI_ALLOCATE_ZEROED (Info.Length);
     if (!InternalName)
     {
         return_ACPI_STATUS (AE_NO_MEMORY);
     }
 
     /* Build the name */
 
     Info.InternalName = InternalName;
     Status = AcpiNsBuildInternalName (&Info);
     if (ACPI_FAILURE (Status))
     {
         ACPI_FREE (InternalName);
         return_ACPI_STATUS (Status);
     }
 
     *ConvertedName = InternalName;
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsExternalizeName
  *
  * PARAMETERS:  InternalNameLength  - Length of the internal name below
  *              InternalName        - Internal representation of name
  *              ConvertedNameLength - Where the length is returned
  *              ConvertedName       - Where the resulting external name
  *                                    is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
  *              to its external (printable) form (e.g. "\_PR_.CPU0")
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsExternalizeName (
     UINT32                  InternalNameLength,
     const char              *InternalName,
     UINT32                  *ConvertedNameLength,
     char                    **ConvertedName)
 {
     UINT32                  NamesIndex = 0;
     UINT32                  NumSegments = 0;
     UINT32                  RequiredLength;
     UINT32                  PrefixLength = 0;
     UINT32                  i = 0;
     UINT32                  j = 0;
 
 
     ACPI_FUNCTION_TRACE (NsExternalizeName);
 
 
     if (!InternalNameLength     ||
         !InternalName           ||
         !ConvertedName)
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Check for a prefix (one '\' | one or more '^') */
 
     switch (InternalName[0])
     {
     case AML_ROOT_PREFIX:
 
         PrefixLength = 1;
         break;
 
     case AML_PARENT_PREFIX:
 
         for (i = 0; i < InternalNameLength; i++)
         {
             if (ACPI_IS_PARENT_PREFIX (InternalName[i]))
             {
                 PrefixLength = i + 1;
             }
             else
             {
                 break;
             }
         }
 
         if (i == InternalNameLength)
         {
             PrefixLength = i;
         }
 
         break;
 
     default:
 
         break;
     }
 
     /*
      * Check for object names. Note that there could be 0-255 of these
      * 4-byte elements.
      */
     if (PrefixLength < InternalNameLength)
     {
         switch (InternalName[PrefixLength])
         {
         case AML_MULTI_NAME_PREFIX:
 
             /* <count> 4-byte names */
 
             NamesIndex = PrefixLength + 2;
             NumSegments = (UINT8)
                 InternalName[(ACPI_SIZE) PrefixLength + 1];
             break;
 
         case AML_DUAL_NAME_PREFIX:
 
             /* Two 4-byte names */
 
             NamesIndex = PrefixLength + 1;
             NumSegments = 2;
             break;
 
         case 0:
 
             /* NullName */
 
             NamesIndex = 0;
             NumSegments = 0;
             break;
 
         default:
 
             /* one 4-byte name */
 
             NamesIndex = PrefixLength;
             NumSegments = 1;
             break;
         }
     }
 
     /*
      * Calculate the length of ConvertedName, which equals the length
      * of the prefix, length of all object names, length of any required
      * punctuation ('.') between object names, plus the NULL terminator.
      */
     RequiredLength = PrefixLength + (4 * NumSegments) +
         ((NumSegments > 0) ? (NumSegments - 1) : 0) + 1;
 
     /*
      * Check to see if we're still in bounds. If not, there's a problem
      * with InternalName (invalid format).
      */
     if (RequiredLength > InternalNameLength)
     {
         ACPI_ERROR ((AE_INFO, "Invalid internal name"));
         return_ACPI_STATUS (AE_BAD_PATHNAME);
     }
 
     /* Build the ConvertedName */
 
     *ConvertedName = ACPI_ALLOCATE_ZEROED (RequiredLength);
     if (!(*ConvertedName))
     {
         return_ACPI_STATUS (AE_NO_MEMORY);
     }
 
     j = 0;
 
     for (i = 0; i < PrefixLength; i++)
     {
         (*ConvertedName)[j++] = InternalName[i];
     }
 
     if (NumSegments > 0)
     {
         for (i = 0; i < NumSegments; i++)
         {
             if (i > 0)
             {
                 (*ConvertedName)[j++] = '.';
             }
 
             /* Copy and validate the 4-char name segment */
 
             ACPI_COPY_NAMESEG (&(*ConvertedName)[j],
                 &InternalName[NamesIndex]);
             AcpiUtRepairName (&(*ConvertedName)[j]);
 
             j += ACPI_NAMESEG_SIZE;
             NamesIndex += ACPI_NAMESEG_SIZE;
         }
     }
 
     if (ConvertedNameLength)
     {
         *ConvertedNameLength = (UINT32) RequiredLength;
     }
 
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsValidateHandle
  *
  * PARAMETERS:  Handle          - Handle to be validated and typecast to a
  *                                namespace node.
  *
  * RETURN:      A pointer to a namespace node
  *
  * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
  *              cases for the root node.
  *
  * NOTE: Real integer handles would allow for more verification
  *       and keep all pointers within this subsystem - however this introduces
  *       more overhead and has not been necessary to this point. Drivers
  *       holding handles are typically notified before a node becomes invalid
  *       due to a table unload.
  *
  ******************************************************************************/
 
 ACPI_NAMESPACE_NODE *
 AcpiNsValidateHandle (
     ACPI_HANDLE             Handle)
 {
 
     ACPI_FUNCTION_ENTRY ();
 
 
     /* Parameter validation */
 
     if ((!Handle) || (Handle == ACPI_ROOT_OBJECT))
     {
         return (AcpiGbl_RootNode);
     }
 
     /* We can at least attempt to verify the handle */
 
     if (ACPI_GET_DESCRIPTOR_TYPE (Handle) != ACPI_DESC_TYPE_NAMED)
     {
         return (NULL);
     }
 
     return (ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Handle));
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsTerminate
  *
  * PARAMETERS:  none
  *
  * RETURN:      none
  *
  * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
  *
  ******************************************************************************/
 
 void
 AcpiNsTerminate (
     void)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (NsTerminate);
 
 
     /*
      * Free the entire namespace -- all nodes and all objects
      * attached to the nodes
      */
     AcpiNsDeleteNamespaceSubtree (AcpiGbl_RootNode);
 
     /* Delete any objects attached to the root node */
 
     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
     if (ACPI_FAILURE (Status))
     {
         return_VOID;
     }
 
     AcpiNsDeleteNode (AcpiGbl_RootNode);
     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 
     ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n"));
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsOpensScope
  *
  * PARAMETERS:  Type        - A valid namespace type
  *
  * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
  *              to the ACPI specification, else 0
  *
  ******************************************************************************/
 
 UINT32
 AcpiNsOpensScope (
     ACPI_OBJECT_TYPE        Type)
 {
     ACPI_FUNCTION_ENTRY ();
 
 
     if (Type > ACPI_TYPE_LOCAL_MAX)
     {
         /* type code out of range  */
 
         ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
         return (ACPI_NS_NORMAL);
     }
 
     return (((UINT32) AcpiGbl_NsProperties[Type]) & ACPI_NS_NEWSCOPE);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetNodeUnlocked
  *
  * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
  *                            \ (backslash) and ^ (carat) prefixes, and the
  *                            . (period) to separate segments are supported.
  *              PrefixNode   - Root of subtree to be searched, or NS_ALL for the
  *                            root of the name space. If Name is fully
  *                            qualified (first INT8 is '\'), the passed value
  *                            of Scope will not be accessed.
  *              Flags       - Used to indicate whether to perform upsearch or
  *                            not.
  *              ReturnNode  - Where the Node is returned
  *
  * DESCRIPTION: Look up a name relative to a given scope and return the
  *              corresponding Node. NOTE: Scope can be null.
  *
  * MUTEX:       Doesn't locks namespace
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsGetNodeUnlocked (
     ACPI_NAMESPACE_NODE     *PrefixNode,
     const char              *Pathname,
     UINT32                  Flags,
     ACPI_NAMESPACE_NODE     **ReturnNode)
 {
     ACPI_GENERIC_STATE      ScopeInfo;
     ACPI_STATUS             Status;
     char                    *InternalPath;
 
 
     ACPI_FUNCTION_TRACE_PTR (NsGetNodeUnlocked, ACPI_CAST_PTR (char, Pathname));
 
 
     /* Simplest case is a null pathname */
 
     if (!Pathname)
     {
         *ReturnNode = PrefixNode;
         if (!PrefixNode)
         {
             *ReturnNode = AcpiGbl_RootNode;
         }
 
         return_ACPI_STATUS (AE_OK);
     }
 
     /* Quick check for a reference to the root */
 
     if (ACPI_IS_ROOT_PREFIX (Pathname[0]) && (!Pathname[1]))
     {
         *ReturnNode = AcpiGbl_RootNode;
         return_ACPI_STATUS (AE_OK);
     }
 
     /* Convert path to internal representation */
 
     Status = AcpiNsInternalizeName (Pathname, &InternalPath);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /* Setup lookup scope (search starting point) */
 
     ScopeInfo.Scope.Node = PrefixNode;
 
     /* Lookup the name in the namespace */
 
     Status = AcpiNsLookup (&ScopeInfo, InternalPath, ACPI_TYPE_ANY,
         ACPI_IMODE_EXECUTE, (Flags | ACPI_NS_DONT_OPEN_SCOPE),
         NULL, ReturnNode);
     if (ACPI_FAILURE (Status))
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s, %s\n",
             Pathname, AcpiFormatException (Status)));
     }
 
     ACPI_FREE (InternalPath);
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetNode
  *
  * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
  *                            \ (backslash) and ^ (carat) prefixes, and the
  *                            . (period) to separate segments are supported.
  *              PrefixNode   - Root of subtree to be searched, or NS_ALL for the
  *                            root of the name space. If Name is fully
  *                            qualified (first INT8 is '\'), the passed value
  *                            of Scope will not be accessed.
  *              Flags       - Used to indicate whether to perform upsearch or
  *                            not.
  *              ReturnNode  - Where the Node is returned
  *
  * DESCRIPTION: Look up a name relative to a given scope and return the
  *              corresponding Node. NOTE: Scope can be null.
  *
  * MUTEX:       Locks namespace
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsGetNode (
     ACPI_NAMESPACE_NODE     *PrefixNode,
     const char              *Pathname,
     UINT32                  Flags,
     ACPI_NAMESPACE_NODE     **ReturnNode)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE_PTR (NsGetNode, ACPI_CAST_PTR (char, Pathname));
 
 
     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     Status = AcpiNsGetNodeUnlocked (PrefixNode, Pathname,
         Flags, ReturnNode);
 
     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
     return_ACPI_STATUS (Status);
 }

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