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

     /******************************************************************************
      *
      * Module Name: nsxfname - Public interfaces to the ACPI subsystem
      *                         ACPI Namespace oriented interfaces
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
     * 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.
    *
    *****************************************************************************/
   
   #define EXPORT_ACPI_INTERFACES
   
   #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/acparser.h>
   #include <contrib/dev/acpica/include/amlcode.h>
   
   
   #define _COMPONENT          ACPI_NAMESPACE
           ACPI_MODULE_NAME    ("nsxfname")
   
   /* Local prototypes */
   
   static char *
   AcpiNsCopyDeviceId (
       ACPI_PNP_DEVICE_ID      *Dest,
       ACPI_PNP_DEVICE_ID      *Source,
       char                    *StringArea);
   
   
   /******************************************************************************
    *
    * FUNCTION:    AcpiGetHandle
    *
    * PARAMETERS:  Parent          - Object to search under (search scope).
    *              Pathname        - Pointer to an asciiz string containing the
    *                                name
    *              RetHandle       - Where the return handle is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This routine will search for a caller specified name in the
    *              name space. The caller can restrict the search region by
    *              specifying a non NULL parent. The parent value is itself a
    *              namespace handle.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetHandle (
       ACPI_HANDLE             Parent,
       ACPI_STRING             Pathname,
       ACPI_HANDLE             *RetHandle)
   {
       ACPI_STATUS             Status;
       ACPI_NAMESPACE_NODE     *Node = NULL;
       ACPI_NAMESPACE_NODE     *PrefixNode = NULL;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       /* Parameter Validation */
   
       if (!RetHandle || !Pathname)
       {
           return (AE_BAD_PARAMETER);
       }
   
       /* Convert a parent handle to a prefix node */
   
       if (Parent)
       {
           PrefixNode = AcpiNsValidateHandle (Parent);
           if (!PrefixNode)
           {
               return (AE_BAD_PARAMETER);
           }
       }
   
       /*
        * Valid cases are:
        * 1) Fully qualified pathname
        * 2) Parent + Relative pathname
        *
        * Error for <null Parent + relative path>
        */
       if (ACPI_IS_ROOT_PREFIX (Pathname[0]))
       {
           /* Pathname is fully qualified (starts with '\') */
   
           /* Special case for root-only, since we can't search for it */
   
           if (!strcmp (Pathname, ACPI_NS_ROOT_PATH))
           {
               *RetHandle = ACPI_CAST_PTR (ACPI_HANDLE, AcpiGbl_RootNode);
               return (AE_OK);
           }
       }
       else if (!PrefixNode)
       {
           /* Relative path with null prefix is disallowed */
   
           return (AE_BAD_PARAMETER);
       }
   
       /* Find the Node and convert to a handle */
   
       Status = AcpiNsGetNode (PrefixNode, Pathname, ACPI_NS_NO_UPSEARCH, &Node);
       if (ACPI_SUCCESS (Status))
       {
           *RetHandle = ACPI_CAST_PTR (ACPI_HANDLE, Node);
       }
   
       return (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetHandle)
   
   
   /******************************************************************************
    *
    * FUNCTION:    AcpiGetName
    *
    * PARAMETERS:  Handle          - Handle to be converted to a pathname
    *              NameType        - Full pathname or single segment
    *              Buffer          - Buffer for returned path
    *
    * RETURN:      Pointer to a string containing the fully qualified Name.
    *
    * DESCRIPTION: This routine returns the fully qualified name associated with
    *              the Handle parameter. This and the AcpiPathnameToHandle are
    *              complementary functions.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetName (
       ACPI_HANDLE             Handle,
       UINT32                  NameType,
       ACPI_BUFFER             *Buffer)
   {
       ACPI_STATUS             Status;
   
   
       /* Parameter validation */
   
       if (NameType > ACPI_NAME_TYPE_MAX)
       {
           return (AE_BAD_PARAMETER);
       }
   
       Status = AcpiUtValidateBuffer (Buffer);
       if (ACPI_FAILURE (Status))
       {
           return (Status);
       }
   
       /*
        * Wants the single segment ACPI name.
        * Validate handle and convert to a namespace Node
        */
       Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
       if (ACPI_FAILURE (Status))
       {
           return (Status);
       }
   
       if (NameType == ACPI_FULL_PATHNAME ||
           NameType == ACPI_FULL_PATHNAME_NO_TRAILING)
       {
           /* Get the full pathname (From the namespace root) */
   
           Status = AcpiNsHandleToPathname (Handle, Buffer,
               NameType == ACPI_FULL_PATHNAME ? FALSE : TRUE);
       }
       else
       {
           /* Get the single name */
   
           Status = AcpiNsHandleToName (Handle, Buffer);
       }
   
       (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
       return (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetName)
   
   
   /******************************************************************************
    *
    * FUNCTION:    AcpiNsCopyDeviceId
    *
    * PARAMETERS:  Dest                - Pointer to the destination PNP_DEVICE_ID
    *              Source              - Pointer to the source PNP_DEVICE_ID
    *              StringArea          - Pointer to where to copy the dest string
    *
    * RETURN:      Pointer to the next string area
    *
    * DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
    *
    ******************************************************************************/
   
   static char *
   AcpiNsCopyDeviceId (
       ACPI_PNP_DEVICE_ID      *Dest,
       ACPI_PNP_DEVICE_ID      *Source,
       char                    *StringArea)
   {
       /* Create the destination PNP_DEVICE_ID */
   
       Dest->String = StringArea;
       Dest->Length = Source->Length;
   
       /* Copy actual string and return a pointer to the next string area */
   
       memcpy (StringArea, Source->String, Source->Length);
       return (StringArea + Source->Length);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    AcpiGetObjectInfo
    *
    * PARAMETERS:  Handle              - Object Handle
    *              ReturnBuffer        - Where the info is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Returns information about an object as gleaned from the
    *              namespace node and possibly by running several standard
    *              control methods (Such as in the case of a device.)
    *
    * For Device and Processor objects, run the Device _HID, _UID, _CID,
    * _CLS, _ADR, _SxW, and _SxD methods.
    *
    * Note: Allocates the return buffer, must be freed by the caller.
    *
    * Note: This interface is intended to be used during the initial device
    * discovery namespace traversal. Therefore, no complex methods can be
    * executed, especially those that access operation regions. Therefore, do
    * not add any additional methods that could cause problems in this area.
    * Because of this reason support for the following methods has been removed:
    * 1) _SUB method was removed (11/2015)
    * 2) _STA method was removed (02/2018)
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetObjectInfo (
       ACPI_HANDLE             Handle,
       ACPI_DEVICE_INFO        **ReturnBuffer)
   {
       ACPI_NAMESPACE_NODE     *Node;
       ACPI_DEVICE_INFO        *Info;
       ACPI_PNP_DEVICE_ID_LIST *CidList = NULL;
       ACPI_PNP_DEVICE_ID      *Hid = NULL;
       ACPI_PNP_DEVICE_ID      *Uid = NULL;
       ACPI_PNP_DEVICE_ID      *Cls = NULL;
       char                    *NextIdString;
       ACPI_OBJECT_TYPE        Type;
       ACPI_NAME               Name;
       UINT8                   ParamCount= 0;
       UINT16                  Valid = 0;
       UINT32                  InfoSize;
       UINT32                  i;
       ACPI_STATUS             Status;
   
   
       /* Parameter validation */
   
       if (!Handle || !ReturnBuffer)
       {
           return (AE_BAD_PARAMETER);
       }
   
       Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
       if (ACPI_FAILURE (Status))
       {
           return (Status);
       }
   
       Node = AcpiNsValidateHandle (Handle);
       if (!Node)
       {
           (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
           return (AE_BAD_PARAMETER);
       }
   
       /* Get the namespace node data while the namespace is locked */
   
       InfoSize = sizeof (ACPI_DEVICE_INFO);
       Type = Node->Type;
       Name = Node->Name.Integer;
   
       if (Node->Type == ACPI_TYPE_METHOD)
       {
           ParamCount = Node->Object->Method.ParamCount;
       }
   
       Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
       if (ACPI_FAILURE (Status))
       {
           return (Status);
       }
   
       if ((Type == ACPI_TYPE_DEVICE) ||
           (Type == ACPI_TYPE_PROCESSOR))
       {
           /*
            * Get extra info for ACPI Device/Processor objects only:
            * Run the Device _HID, _UID, _CLS, and _CID methods.
            *
            * Note: none of these methods are required, so they may or may
            * not be present for this device. The Info->Valid bitfield is used
            * to indicate which methods were found and run successfully.
            */
   
           /* Execute the Device._HID method */
   
           Status = AcpiUtExecute_HID (Node, &Hid);
           if (ACPI_SUCCESS (Status))
           {
               InfoSize += Hid->Length;
               Valid |= ACPI_VALID_HID;
           }
   
           /* Execute the Device._UID method */
   
           Status = AcpiUtExecute_UID (Node, &Uid);
           if (ACPI_SUCCESS (Status))
           {
               InfoSize += Uid->Length;
               Valid |= ACPI_VALID_UID;
           }
   
           /* Execute the Device._CID method */
   
           Status = AcpiUtExecute_CID (Node, &CidList);
           if (ACPI_SUCCESS (Status))
           {
               /* Add size of CID strings and CID pointer array */
   
               InfoSize += (CidList->ListSize - sizeof (ACPI_PNP_DEVICE_ID_LIST));
               Valid |= ACPI_VALID_CID;
           }
   
           /* Execute the Device._CLS method */
   
           Status = AcpiUtExecute_CLS (Node, &Cls);
           if (ACPI_SUCCESS (Status))
           {
               InfoSize += Cls->Length;
               Valid |= ACPI_VALID_CLS;
           }
       }
   
       /*
        * Now that we have the variable-length data, we can allocate the
        * return buffer
        */
       Info = ACPI_ALLOCATE_ZEROED (InfoSize);
       if (!Info)
       {
           Status = AE_NO_MEMORY;
           goto Cleanup;
       }
   
       /* Get the fixed-length data */
   
       if ((Type == ACPI_TYPE_DEVICE) ||
           (Type == ACPI_TYPE_PROCESSOR))
       {
           /*
            * Get extra info for ACPI Device/Processor objects only:
            * Run the _ADR and, SxW, and _SxD methods.
            *
            * Notes: none of these methods are required, so they may or may
            * not be present for this device. The Info->Valid bitfield is used
            * to indicate which methods were found and run successfully.
            */
   
           /* Execute the Device._ADR method */
   
           Status = AcpiUtEvaluateNumericObject (METHOD_NAME__ADR, Node,
               &Info->Address);
           if (ACPI_SUCCESS (Status))
           {
               Valid |= ACPI_VALID_ADR;
           }
   
           /* Execute the Device._SxW methods */
   
           Status = AcpiUtExecutePowerMethods (Node,
               AcpiGbl_LowestDstateNames, ACPI_NUM_SxW_METHODS,
               Info->LowestDstates);
           if (ACPI_SUCCESS (Status))
           {
               Valid |= ACPI_VALID_SXWS;
           }
   
           /* Execute the Device._SxD methods */
   
           Status = AcpiUtExecutePowerMethods (Node,
               AcpiGbl_HighestDstateNames, ACPI_NUM_SxD_METHODS,
               Info->HighestDstates);
           if (ACPI_SUCCESS (Status))
           {
               Valid |= ACPI_VALID_SXDS;
           }
       }
   
       /*
        * Create a pointer to the string area of the return buffer.
        * Point to the end of the base ACPI_DEVICE_INFO structure.
        */
       NextIdString = ACPI_CAST_PTR (char, Info->CompatibleIdList.Ids);
       if (CidList)
       {
           /* Point past the CID PNP_DEVICE_ID array */
   
           NextIdString += ((ACPI_SIZE) CidList->Count * sizeof (ACPI_PNP_DEVICE_ID));
       }
   
       /*
        * Copy the HID, UID, and CIDs to the return buffer. The variable-length
        * strings are copied to the reserved area at the end of the buffer.
        *
        * For HID and CID, check if the ID is a PCI Root Bridge.
        */
       if (Hid)
       {
           NextIdString = AcpiNsCopyDeviceId (&Info->HardwareId,
               Hid, NextIdString);
   
           if (AcpiUtIsPciRootBridge (Hid->String))
           {
               Info->Flags |= ACPI_PCI_ROOT_BRIDGE;
           }
       }
   
       if (Uid)
       {
           NextIdString = AcpiNsCopyDeviceId (&Info->UniqueId,
               Uid, NextIdString);
       }
   
       if (CidList)
       {
           Info->CompatibleIdList.Count = CidList->Count;
           Info->CompatibleIdList.ListSize = CidList->ListSize;
   
           /* Copy each CID */
   
           for (i = 0; i < CidList->Count; i++)
           {
               NextIdString = AcpiNsCopyDeviceId (&Info->CompatibleIdList.Ids[i],
                   &CidList->Ids[i], NextIdString);
   
               if (AcpiUtIsPciRootBridge (CidList->Ids[i].String))
               {
                   Info->Flags |= ACPI_PCI_ROOT_BRIDGE;
               }
           }
       }
   
       if (Cls)
       {
          (void) AcpiNsCopyDeviceId (&Info->ClassCode,
               Cls, NextIdString);
       }
   
       /* Copy the fixed-length data */
   
       Info->InfoSize = InfoSize;
       Info->Type = Type;
       Info->Name = Name;
       Info->ParamCount = ParamCount;
       Info->Valid = Valid;
   
       *ReturnBuffer = Info;
       Status = AE_OK;
   
   
   Cleanup:
       if (Hid)
       {
           ACPI_FREE (Hid);
       }
       if (Uid)
       {
           ACPI_FREE (Uid);
       }
       if (CidList)
       {
           ACPI_FREE (CidList);
       }
       if (Cls)
       {
           ACPI_FREE (Cls);
       }
       return (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetObjectInfo)
   
   
   /******************************************************************************
    *
    * FUNCTION:    AcpiInstallMethod
    *
    * PARAMETERS:  Buffer         - An ACPI table containing one control method
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Install a control method into the namespace. If the method
    *              name already exists in the namespace, it is overwritten. The
    *              input buffer must contain a valid DSDT or SSDT containing a
    *              single control method.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiInstallMethod (
       UINT8                   *Buffer)
   {
       ACPI_TABLE_HEADER       *Table = ACPI_CAST_PTR (ACPI_TABLE_HEADER, Buffer);
       UINT8                   *AmlBuffer;
       UINT8                   *AmlStart;
       char                    *Path;
       ACPI_NAMESPACE_NODE     *Node;
       ACPI_OPERAND_OBJECT     *MethodObj;
       ACPI_PARSE_STATE        ParserState;
       UINT32                  AmlLength;
       UINT16                  Opcode;
       UINT8                   MethodFlags;
       ACPI_STATUS             Status;
   
   
       /* Parameter validation */
   
       if (!Buffer)
       {
           return (AE_BAD_PARAMETER);
       }
   
       /* Table must be a DSDT or SSDT */
   
       if (!ACPI_COMPARE_NAMESEG (Table->Signature, ACPI_SIG_DSDT) &&
           !ACPI_COMPARE_NAMESEG (Table->Signature, ACPI_SIG_SSDT))
       {
           return (AE_BAD_HEADER);
       }
   
       /* First AML opcode in the table must be a control method */
   
       ParserState.Aml = Buffer + sizeof (ACPI_TABLE_HEADER);
       Opcode = AcpiPsPeekOpcode (&ParserState);
       if (Opcode != AML_METHOD_OP)
       {
           return (AE_BAD_PARAMETER);
       }
   
       /* Extract method information from the raw AML */
   
       ParserState.Aml += AcpiPsGetOpcodeSize (Opcode);
       ParserState.PkgEnd = AcpiPsGetNextPackageEnd (&ParserState);
       Path = AcpiPsGetNextNamestring (&ParserState);
   
       MethodFlags = *ParserState.Aml++;
       AmlStart = ParserState.Aml;
       AmlLength = (UINT32) ACPI_PTR_DIFF (ParserState.PkgEnd, AmlStart);
   
       /*
        * Allocate resources up-front. We don't want to have to delete a new
        * node from the namespace if we cannot allocate memory.
        */
       AmlBuffer = ACPI_ALLOCATE (AmlLength);
       if (!AmlBuffer)
       {
           return (AE_NO_MEMORY);
       }
   
       MethodObj = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
       if (!MethodObj)
       {
           ACPI_FREE (AmlBuffer);
           return (AE_NO_MEMORY);
       }
   
       /* Lock namespace for AcpiNsLookup, we may be creating a new node */
   
       Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
       if (ACPI_FAILURE (Status))
       {
           goto ErrorExit;
       }
   
       /* The lookup either returns an existing node or creates a new one */
   
       Status = AcpiNsLookup (NULL, Path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
           ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND, NULL, &Node);
   
       (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
   
       if (ACPI_FAILURE (Status)) /* NsLookup */
       {
           if (Status != AE_ALREADY_EXISTS)
           {
               goto ErrorExit;
           }
   
           /* Node existed previously, make sure it is a method node */
   
           if (Node->Type != ACPI_TYPE_METHOD)
           {
               Status = AE_TYPE;
               goto ErrorExit;
           }
       }
   
       /* Copy the method AML to the local buffer */
   
       memcpy (AmlBuffer, AmlStart, AmlLength);
   
       /* Initialize the method object with the new method's information */
   
       MethodObj->Method.AmlStart = AmlBuffer;
       MethodObj->Method.AmlLength = AmlLength;
   
       MethodObj->Method.ParamCount = (UINT8)
           (MethodFlags & AML_METHOD_ARG_COUNT);
   
       if (MethodFlags & AML_METHOD_SERIALIZED)
       {
           MethodObj->Method.InfoFlags = ACPI_METHOD_SERIALIZED;
   
           MethodObj->Method.SyncLevel = (UINT8)
               ((MethodFlags & AML_METHOD_SYNC_LEVEL) >> 4);
       }
   
       /*
        * Now that it is complete, we can attach the new method object to
        * the method Node (detaches/deletes any existing object)
        */
       Status = AcpiNsAttachObject (Node, MethodObj, ACPI_TYPE_METHOD);
   
       /*
        * Flag indicates AML buffer is dynamic, must be deleted later.
        * Must be set only after attach above.
        */
       Node->Flags |= ANOBJ_ALLOCATED_BUFFER;
   
       /* Remove local reference to the method object */
   
       AcpiUtRemoveReference (MethodObj);
       return (Status);
   
   
   ErrorExit:
   
       ACPI_FREE (AmlBuffer);
       ACPI_FREE (MethodObj);
       return (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiInstallMethod)

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