384 lines
14 KiB
C
384 lines
14 KiB
C
/******************************************************************************
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*
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* Module Name: nswalk - Functions for walking the ACPI namespace
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* $Revision: 36 $
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*
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*****************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999 - 2004, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#define __NSWALK_C__
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#include "acpi.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME ("nswalk")
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsGetNextNode
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*
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* PARAMETERS: Type - Type of node to be searched for
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* ParentNode - Parent node whose children we are
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* getting
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* ChildNode - Previous child that was found.
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* The NEXT child will be returned
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*
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* RETURN: ACPI_NAMESPACE_NODE - Pointer to the NEXT child or NULL if
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* none is found.
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*
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* DESCRIPTION: Return the next peer node within the namespace. If Handle
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* is valid, Scope is ignored. Otherwise, the first node
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* within Scope is returned.
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*
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******************************************************************************/
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ACPI_NAMESPACE_NODE *
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AcpiNsGetNextNode (
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ACPI_OBJECT_TYPE Type,
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ACPI_NAMESPACE_NODE *ParentNode,
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ACPI_NAMESPACE_NODE *ChildNode)
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{
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ACPI_NAMESPACE_NODE *NextNode = NULL;
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ACPI_FUNCTION_ENTRY ();
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if (!ChildNode)
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{
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/* It's really the parent's _scope_ that we want */
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if (ParentNode->Child)
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{
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NextNode = ParentNode->Child;
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}
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}
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else
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{
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/* Start search at the NEXT node */
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NextNode = AcpiNsGetNextValidNode (ChildNode);
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}
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/* If any type is OK, we are done */
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if (Type == ACPI_TYPE_ANY)
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{
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/* NextNode is NULL if we are at the end-of-list */
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return (NextNode);
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}
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/* Must search for the node -- but within this scope only */
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while (NextNode)
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{
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/* If type matches, we are done */
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if (NextNode->Type == Type)
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{
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return (NextNode);
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}
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/* Otherwise, move on to the next node */
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NextNode = AcpiNsGetNextValidNode (NextNode);
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}
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/* Not found */
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return (NULL);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsWalkNamespace
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*
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* PARAMETERS: Type - ACPI_OBJECT_TYPE to search for
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* StartNode - Handle in namespace where search begins
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* MaxDepth - Depth to which search is to reach
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* UnlockBeforeCallback- Whether to unlock the NS before invoking
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* the callback routine
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* UserFunction - Called when an object of "Type" is found
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* Context - Passed to user function
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* ReturnValue - from the UserFunction if terminated early.
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* Otherwise, returns NULL.
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* RETURNS: Status
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*
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* DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
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* starting (and ending) at the node specified by StartHandle.
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* The UserFunction is called whenever a node that matches
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* the type parameter is found. If the user function returns
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* a non-zero value, the search is terminated immediately and this
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* value is returned to the caller.
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*
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* The point of this procedure is to provide a generic namespace
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* walk routine that can be called from multiple places to
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* provide multiple services; the User Function can be tailored
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* to each task, whether it is a print function, a compare
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* function, etc.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsWalkNamespace (
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ACPI_OBJECT_TYPE Type,
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ACPI_HANDLE StartNode,
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UINT32 MaxDepth,
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BOOLEAN UnlockBeforeCallback,
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ACPI_WALK_CALLBACK UserFunction,
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void *Context,
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void **ReturnValue)
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{
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ACPI_STATUS Status;
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ACPI_STATUS MutexStatus;
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ACPI_NAMESPACE_NODE *ChildNode;
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ACPI_NAMESPACE_NODE *ParentNode;
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ACPI_OBJECT_TYPE ChildType;
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UINT32 Level;
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ACPI_FUNCTION_TRACE ("NsWalkNamespace");
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/* Special case for the namespace Root Node */
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if (StartNode == ACPI_ROOT_OBJECT)
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{
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StartNode = AcpiGbl_RootNode;
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}
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/* Null child means "get first node" */
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ParentNode = StartNode;
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ChildNode = 0;
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ChildType = ACPI_TYPE_ANY;
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Level = 1;
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/*
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* Traverse the tree of nodes until we bubble back up to where we
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* started. When Level is zero, the loop is done because we have
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* bubbled up to (and passed) the original parent handle (StartEntry)
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*/
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while (Level > 0)
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{
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/* Get the next node in this scope. Null if not found */
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Status = AE_OK;
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ChildNode = AcpiNsGetNextNode (ACPI_TYPE_ANY, ParentNode, ChildNode);
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if (ChildNode)
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{
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/*
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* Found node, Get the type if we are not
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* searching for ANY
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*/
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if (Type != ACPI_TYPE_ANY)
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{
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ChildType = ChildNode->Type;
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}
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if (ChildType == Type)
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{
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/*
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* Found a matching node, invoke the user
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* callback function
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*/
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if (UnlockBeforeCallback)
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{
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MutexStatus = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (MutexStatus))
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{
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return_ACPI_STATUS (MutexStatus);
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}
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}
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Status = UserFunction (ChildNode, Level,
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Context, ReturnValue);
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if (UnlockBeforeCallback)
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{
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MutexStatus = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (MutexStatus))
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{
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return_ACPI_STATUS (MutexStatus);
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}
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}
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switch (Status)
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{
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case AE_OK:
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case AE_CTRL_DEPTH:
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/* Just keep going */
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break;
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case AE_CTRL_TERMINATE:
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/* Exit now, with OK status */
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return_ACPI_STATUS (AE_OK);
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default:
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/* All others are valid exceptions */
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return_ACPI_STATUS (Status);
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}
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}
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/*
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* Depth first search:
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* Attempt to go down another level in the namespace
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* if we are allowed to. Don't go any further if we
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* have reached the caller specified maximum depth
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* or if the user function has specified that the
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* maximum depth has been reached.
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*/
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if ((Level < MaxDepth) && (Status != AE_CTRL_DEPTH))
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{
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if (AcpiNsGetNextNode (ACPI_TYPE_ANY, ChildNode, 0))
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{
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/*
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* There is at least one child of this
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* node, visit the onde
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*/
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Level++;
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ParentNode = ChildNode;
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ChildNode = 0;
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}
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}
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}
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else
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{
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/*
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* No more children of this node (AcpiNsGetNextNode
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* failed), go back upwards in the namespace tree to
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* the node's parent.
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*/
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Level--;
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ChildNode = ParentNode;
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ParentNode = AcpiNsGetParentNode (ParentNode);
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}
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}
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/* Complete walk, not terminated by user function */
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return_ACPI_STATUS (AE_OK);
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}
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