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 /*******************************************************************************
  *
  * Module Name: nssearch - Namespace search
  *
  ******************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
  * All rights reserved.
  *
  * 2. License
  *
  * 2.1. This is your license from Intel Corp. under its intellectual property
  * rights.  You may have additional license terms from the party that provided
  * you this software, covering your right to use that party's intellectual
  * property rights.
  *
  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  * copy of the source code appearing in this file ("Covered Code") an
  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  * base code distributed originally by Intel ("Original Intel Code") to copy,
  * make derivatives, distribute, use and display any portion of the Covered
  * Code in any form, with the right to sublicense such rights; and
  *
  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  * license (with the right to sublicense), under only those claims of Intel
  * patents that are infringed by the Original Intel Code, to make, use, sell,
  * offer to sell, and import the Covered Code and derivative works thereof
  * solely to the minimum extent necessary to exercise the above copyright
  * license, and in no event shall the patent license extend to any additions
  * to or modifications of the Original Intel Code.  No other license or right
  * is granted directly or by implication, estoppel or otherwise;
  *
  * The above copyright and patent license is granted only if the following
  * conditions are met:
  *
  * 3. Conditions
  *
  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification with rights to further distribute source must include
  * the above Copyright Notice, the above License, this list of Conditions,
  * and the following Disclaimer and Export Compliance provision.  In addition,
  * Licensee must cause all Covered Code to which Licensee contributes to
  * contain a file documenting the changes Licensee made to create that Covered
  * Code and the date of any change.  Licensee must include in that file the
  * documentation of any changes made by any predecessor Licensee.  Licensee
  * must include a prominent statement that the modification is derived,
  * directly or indirectly, from Original Intel Code.
  *
  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification without rights to further distribute source must
  * include the following Disclaimer and Export Compliance provision in the
  * documentation and/or other materials provided with distribution.  In
  * addition, Licensee may not authorize further sublicense of source of any
  * portion of the Covered Code, and must include terms to the effect that the
  * license from Licensee to its licensee is limited to the intellectual
  * property embodied in the software Licensee provides to its licensee, and
  * not to intellectual property embodied in modifications its licensee may
  * make.
  *
  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  * substantial portion of the Covered Code or modification must reproduce the
  * above Copyright Notice, and the following Disclaimer and Export Compliance
  * provision in the documentation and/or other materials provided with the
  * distribution.
  *
  * 3.4. Intel retains all right, title, and interest in and to the Original
  * Intel Code.
  *
  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  * Intel shall be used in advertising or otherwise to promote the sale, use or
  * other dealings in products derived from or relating to the Covered Code
  * without prior written authorization from Intel.
  *
  * 4. Disclaimer and Export Compliance
  *
  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  * PARTICULAR PURPOSE.
  *
  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  * LIMITED REMEDY.
  *
  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  * software or system incorporating such software without first obtaining any
  * required license or other approval from the U. S. Department of Commerce or
  * any other agency or department of the United States Government.  In the
  * event Licensee exports any such software from the United States or
  * re-exports any such software from a foreign destination, Licensee shall
  * ensure that the distribution and export/re-export of the software is in
  * compliance with all laws, regulations, orders, or other restrictions of the
  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  * any of its subsidiaries will export/re-export any technical data, process,
  * software, or service, directly or indirectly, to any country for which the
  * United States government or any agency thereof requires an export license,
  * other governmental approval, or letter of assurance, without first obtaining
  * such license, approval or letter.
  *
  *****************************************************************************/
 
 #define __NSSEARCH_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acnamesp.h"
 
 #ifdef ACPI_ASL_COMPILER
 #include "amlcode.h"
 #endif
 
 #define _COMPONENT          ACPI_NAMESPACE
         ACPI_MODULE_NAME    ("nssearch")
 
 /* Local prototypes */
 
 static ACPI_STATUS
 AcpiNsSearchParentTree (
     UINT32                  TargetName,
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_OBJECT_TYPE        Type,
     ACPI_NAMESPACE_NODE     **ReturnNode);
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsSearchOneScope
  *
  * PARAMETERS:  TargetName      - Ascii ACPI name to search for
  *              ParentNode      - Starting node where search will begin
  *              Type            - Object type to match
  *              ReturnNode      - Where the matched Named obj is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Search a single level of the namespace. Performs a
  *              simple search of the specified level, and does not add
  *              entries or search parents.
  *
  *
  *      Named object lists are built (and subsequently dumped) in the
  *      order in which the names are encountered during the namespace load;
  *
  *      All namespace searching is linear in this implementation, but
  *      could be easily modified to support any improved search
  *      algorithm. However, the linear search was chosen for simplicity
  *      and because the trees are small and the other interpreter
  *      execution overhead is relatively high.
  *
  *      Note: CPU execution analysis has shown that the AML interpreter spends
  *      a very small percentage of its time searching the namespace. Therefore,
  *      the linear search seems to be sufficient, as there would seem to be
  *      little value in improving the search.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsSearchOneScope (
     UINT32                  TargetName,
     ACPI_NAMESPACE_NODE     *ParentNode,
     ACPI_OBJECT_TYPE        Type,
     ACPI_NAMESPACE_NODE     **ReturnNode)
 {
     ACPI_NAMESPACE_NODE     *Node;
 
 
     ACPI_FUNCTION_TRACE (NsSearchOneScope);
 
 
 #ifdef ACPI_DEBUG_OUTPUT
     if (ACPI_LV_NAMES & AcpiDbgLevel)
     {
         char                *ScopeName;
 
         ScopeName = AcpiNsGetExternalPathname (ParentNode);
         if (ScopeName)
         {
             ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
                 "Searching %s (%p) For [%4.4s] (%s)\n",
                 ScopeName, ParentNode, ACPI_CAST_PTR (char, &TargetName),
                 AcpiUtGetTypeName (Type)));
 
             ACPI_FREE (ScopeName);
         }
     }
 #endif
 
     /*
      * Search for name at this namespace level, which is to say that we
      * must search for the name among the children of this object
      */
     Node = ParentNode->Child;
     while (Node)
     {
         /* Check for match against the name */
 
         if (Node->Name.Integer == TargetName)
         {
             /* Resolve a control method alias if any */
 
             if (AcpiNsGetType (Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
             {
                 Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
             }
 
             /* Found matching entry */
 
             ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
                 "Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n",
                 ACPI_CAST_PTR (char, &TargetName),
                 AcpiUtGetTypeName (Node->Type),
                 Node, AcpiUtGetNodeName (ParentNode), ParentNode));
 
             *ReturnNode = Node;
             return_ACPI_STATUS (AE_OK);
         }
 
         /*
          * The last entry in the list points back to the parent,
          * so a flag is used to indicate the end-of-list
          */
         if (Node->Flags & ANOBJ_END_OF_PEER_LIST)
         {
             /* Searched entire list, we are done */
 
             break;
         }
 
         /* Didn't match name, move on to the next peer object */
 
         Node = Node->Peer;
     }
 
     /* Searched entire namespace level, not found */
 
     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
         "Name [%4.4s] (%s) not found in search in scope [%4.4s] "
         "%p first child %p\n",
         ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type),
         AcpiUtGetNodeName (ParentNode), ParentNode, ParentNode->Child));
 
     return_ACPI_STATUS (AE_NOT_FOUND);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsSearchParentTree
  *
  * PARAMETERS:  TargetName      - Ascii ACPI name to search for
  *              Node            - Starting node where search will begin
  *              Type            - Object type to match
  *              ReturnNode      - Where the matched Node is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Called when a name has not been found in the current namespace
  *              level. Before adding it or giving up, ACPI scope rules require
  *              searching enclosing scopes in cases identified by AcpiNsLocal().
  *
  *              "A name is located by finding the matching name in the current
  *              name space, and then in the parent name space. If the parent
  *              name space does not contain the name, the search continues
  *              recursively until either the name is found or the name space
  *              does not have a parent (the root of the name space). This
  *              indicates that the name is not found" (From ACPI Specification,
  *              section 5.3)
  *
  ******************************************************************************/
 
 static ACPI_STATUS
 AcpiNsSearchParentTree (
     UINT32                  TargetName,
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_OBJECT_TYPE        Type,
     ACPI_NAMESPACE_NODE     **ReturnNode)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *ParentNode;
 
 
     ACPI_FUNCTION_TRACE (NsSearchParentTree);
 
 
     ParentNode = AcpiNsGetParentNode (Node);
 
     /*
      * If there is no parent (i.e., we are at the root) or type is "local",
      * we won't be searching the parent tree.
      */
     if (!ParentNode)
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "[%4.4s] has no parent\n",
             ACPI_CAST_PTR (char, &TargetName)));
         return_ACPI_STATUS (AE_NOT_FOUND);
     }
 
     if (AcpiNsLocal (Type))
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
             "[%4.4s] type [%s] must be local to this scope (no parent search)\n",
             ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type)));
         return_ACPI_STATUS (AE_NOT_FOUND);
     }
 
     /* Search the parent tree */
 
     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
         "Searching parent [%4.4s] for [%4.4s]\n",
         AcpiUtGetNodeName (ParentNode), ACPI_CAST_PTR (char, &TargetName)));
 
     /* Search parents until target is found or we have backed up to the root */
 
     while (ParentNode)
     {
         /*
          * Search parent scope. Use TYPE_ANY because we don't care about the
          * object type at this point, we only care about the existence of
          * the actual name we are searching for. Typechecking comes later.
          */
         Status = AcpiNsSearchOneScope (
                     TargetName, ParentNode, ACPI_TYPE_ANY, ReturnNode);
         if (ACPI_SUCCESS (Status))
         {
             return_ACPI_STATUS (Status);
         }
 
         /* Not found here, go up another level (until we reach the root) */
 
         ParentNode = AcpiNsGetParentNode (ParentNode);
     }
 
     /* Not found in parent tree */
 
     return_ACPI_STATUS (AE_NOT_FOUND);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsSearchAndEnter
  *
  * PARAMETERS:  TargetName          - Ascii ACPI name to search for (4 chars)
  *              WalkState           - Current state of the walk
  *              Node                - Starting node where search will begin
  *              InterpreterMode     - Add names only in ACPI_MODE_LOAD_PASS_x.
  *                                    Otherwise,search only.
  *              Type                - Object type to match
  *              Flags               - Flags describing the search restrictions
  *              ReturnNode          - Where the Node is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Search for a name segment in a single namespace level,
  *              optionally adding it if it is not found. If the passed
  *              Type is not Any and the type previously stored in the
  *              entry was Any (i.e. unknown), update the stored type.
  *
  *              In ACPI_IMODE_EXECUTE, search only.
  *              In other modes, search and add if not found.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsSearchAndEnter (
     UINT32                  TargetName,
     ACPI_WALK_STATE         *WalkState,
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_INTERPRETER_MODE   InterpreterMode,
     ACPI_OBJECT_TYPE        Type,
     UINT32                  Flags,
     ACPI_NAMESPACE_NODE     **ReturnNode)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *NewNode;
 
 
     ACPI_FUNCTION_TRACE (NsSearchAndEnter);
 
 
     /* Parameter validation */
 
     if (!Node || !TargetName || !ReturnNode)
     {
         ACPI_ERROR ((AE_INFO,
             "Null parameter: Node %p Name %X ReturnNode %p",
             Node, TargetName, ReturnNode));
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /*
      * Name must consist of valid ACPI characters. We will repair the name if
      * necessary because we don't want to abort because of this, but we want
      * all namespace names to be printable. A warning message is appropriate.
      *
      * This issue came up because there are in fact machines that exhibit
      * this problem, and we want to be able to enable ACPI support for them,
      * even though there are a few bad names.
      */
     AcpiUtRepairName (ACPI_CAST_PTR (char, &TargetName));
 
     /* Try to find the name in the namespace level specified by the caller */
 
     *ReturnNode = ACPI_ENTRY_NOT_FOUND;
     Status = AcpiNsSearchOneScope (TargetName, Node, Type, ReturnNode);
     if (Status != AE_NOT_FOUND)
     {
         /*
          * If we found it AND the request specifies that a find is an error,
          * return the error
          */
         if ((Status == AE_OK) &&
             (Flags & ACPI_NS_ERROR_IF_FOUND))
         {
             Status = AE_ALREADY_EXISTS;
         }
 
 #ifdef ACPI_ASL_COMPILER
         if (*ReturnNode && (*ReturnNode)->Type == ACPI_TYPE_ANY)
         {
             (*ReturnNode)->Flags |= ANOBJ_IS_EXTERNAL;
         }
 #endif
 
         /* Either found it or there was an error: finished either way */
 
         return_ACPI_STATUS (Status);
     }
 
     /*
      * The name was not found. If we are NOT performing the first pass
      * (name entry) of loading the namespace, search the parent tree (all the
      * way to the root if necessary.) We don't want to perform the parent
      * search when the namespace is actually being loaded. We want to perform
      * the search when namespace references are being resolved (load pass 2)
      * and during the execution phase.
      */
     if ((InterpreterMode != ACPI_IMODE_LOAD_PASS1) &&
         (Flags & ACPI_NS_SEARCH_PARENT))
     {
         /*
          * Not found at this level - search parent tree according to the
          * ACPI specification
          */
         Status = AcpiNsSearchParentTree (TargetName, Node, Type, ReturnNode);
         if (ACPI_SUCCESS (Status))
         {
             return_ACPI_STATUS (Status);
         }
     }
 
     /* In execute mode, just search, never add names. Exit now */
 
     if (InterpreterMode == ACPI_IMODE_EXECUTE)
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
             "%4.4s Not found in %p [Not adding]\n",
             ACPI_CAST_PTR (char, &TargetName), Node));
 
         return_ACPI_STATUS (AE_NOT_FOUND);
     }
 
     /* Create the new named object */
 
     NewNode = AcpiNsCreateNode (TargetName);
     if (!NewNode)
     {
         return_ACPI_STATUS (AE_NO_MEMORY);
     }
 
 #ifdef ACPI_ASL_COMPILER
 
     /* Node is an object defined by an External() statement */
 
     if (Flags & ACPI_NS_EXTERNAL ||
         (WalkState && WalkState->Opcode == AML_SCOPE_OP))
     {
         NewNode->Flags |= ANOBJ_IS_EXTERNAL;
     }
 #endif
 
     if (Flags & ACPI_NS_TEMPORARY)
     {
         NewNode->Flags |= ANOBJ_TEMPORARY;
     }
 
     /* Install the new object into the parent's list of children */
 
     AcpiNsInstallNode (WalkState, Node, NewNode, Type);
     *ReturnNode = NewNode;
     return_ACPI_STATUS (AE_OK);
 }