FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/namespace/nsutils.c

     /******************************************************************************
      *
      * 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 - 2022, 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 <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   #include <contrib/dev/acpica/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 represention 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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