751 lines
26 KiB
C
751 lines
26 KiB
C
/*******************************************************************************
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*
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* Module Name: nsaccess - Top-level functions for accessing ACPI namespace
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* $Revision: 1.206 $
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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 - 2007, 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 __NSACCESS_C__
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#include <contrib/dev/acpica/acpi.h>
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#include <contrib/dev/acpica/amlcode.h>
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#include <contrib/dev/acpica/acnamesp.h>
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#include <contrib/dev/acpica/acdispat.h>
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME ("nsaccess")
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsRootInitialize
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Allocate and initialize the default root named objects
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*
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* MUTEX: Locks namespace for entire execution
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsRootInitialize (
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void)
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{
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ACPI_STATUS Status;
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const ACPI_PREDEFINED_NAMES *InitVal = NULL;
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ACPI_NAMESPACE_NODE *NewNode;
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ACPI_OPERAND_OBJECT *ObjDesc;
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ACPI_STRING Val = NULL;
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ACPI_FUNCTION_TRACE (NsRootInitialize);
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Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/*
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* The global root ptr is initially NULL, so a non-NULL value indicates
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* that AcpiNsRootInitialize() has already been called; just return.
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*/
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if (AcpiGbl_RootNode)
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{
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Status = AE_OK;
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goto UnlockAndExit;
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}
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/*
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* Tell the rest of the subsystem that the root is initialized
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* (This is OK because the namespace is locked)
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*/
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AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct;
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/* Enter the pre-defined names in the name table */
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"Entering predefined entries into namespace\n"));
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for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++)
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{
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/* _OSI is optional for now, will be permanent later */
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if (!ACPI_STRCMP (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod)
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{
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continue;
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}
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Status = AcpiNsLookup (NULL, InitVal->Name, InitVal->Type,
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ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH,
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NULL, &NewNode);
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if (ACPI_FAILURE (Status) || (!NewNode)) /* Must be on same line for code converter */
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{
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ACPI_EXCEPTION ((AE_INFO, Status,
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"Could not create predefined name %s",
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InitVal->Name));
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}
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/*
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* Name entered successfully.
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* If entry in PreDefinedNames[] specifies an
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* initial value, create the initial value.
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*/
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if (InitVal->Val)
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{
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Status = AcpiOsPredefinedOverride (InitVal, &Val);
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if (ACPI_FAILURE (Status))
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{
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ACPI_ERROR ((AE_INFO,
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"Could not override predefined %s",
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InitVal->Name));
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}
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if (!Val)
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{
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Val = InitVal->Val;
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}
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/*
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* Entry requests an initial value, allocate a
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* descriptor for it.
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*/
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ObjDesc = AcpiUtCreateInternalObject (InitVal->Type);
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if (!ObjDesc)
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{
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Status = AE_NO_MEMORY;
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goto UnlockAndExit;
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}
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/*
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* Convert value string from table entry to
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* internal representation. Only types actually
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* used for initial values are implemented here.
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*/
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switch (InitVal->Type)
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{
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case ACPI_TYPE_METHOD:
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ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val);
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ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID;
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#if defined (ACPI_ASL_COMPILER)
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/* Save the parameter count for the iASL compiler */
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NewNode->Value = ObjDesc->Method.ParamCount;
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#else
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/* Mark this as a very SPECIAL method */
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ObjDesc->Method.MethodFlags = AML_METHOD_INTERNAL_ONLY;
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#ifndef ACPI_DUMP_APP
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ObjDesc->Method.Implementation = AcpiUtOsiImplementation;
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#endif
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#endif
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break;
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case ACPI_TYPE_INTEGER:
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ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val);
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break;
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case ACPI_TYPE_STRING:
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/*
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* Build an object around the static string
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*/
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ObjDesc->String.Length = (UINT32) ACPI_STRLEN (Val);
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ObjDesc->String.Pointer = Val;
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ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
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break;
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case ACPI_TYPE_MUTEX:
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ObjDesc->Mutex.Node = NewNode;
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ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1);
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/* Create a mutex */
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Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex);
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if (ACPI_FAILURE (Status))
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{
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AcpiUtRemoveReference (ObjDesc);
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goto UnlockAndExit;
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}
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/* Special case for ACPI Global Lock */
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if (ACPI_STRCMP (InitVal->Name, "_GL_") == 0)
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{
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AcpiGbl_GlobalLockMutex = ObjDesc;
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/* Create additional counting semaphore for global lock */
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Status = AcpiOsCreateSemaphore (
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1, 0, &AcpiGbl_GlobalLockSemaphore);
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if (ACPI_FAILURE (Status))
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{
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AcpiUtRemoveReference (ObjDesc);
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goto UnlockAndExit;
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}
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}
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break;
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default:
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ACPI_ERROR ((AE_INFO, "Unsupported initial type value %X",
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InitVal->Type));
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AcpiUtRemoveReference (ObjDesc);
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ObjDesc = NULL;
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continue;
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}
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/* Store pointer to value descriptor in the Node */
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Status = AcpiNsAttachObject (NewNode, ObjDesc,
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ACPI_GET_OBJECT_TYPE (ObjDesc));
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/* Remove local reference to the object */
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AcpiUtRemoveReference (ObjDesc);
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}
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}
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UnlockAndExit:
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(void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
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/* Save a handle to "_GPE", it is always present */
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if (ACPI_SUCCESS (Status))
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{
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Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
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&AcpiGbl_FadtGpeDevice);
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}
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsLookup
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*
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* PARAMETERS: ScopeInfo - Current scope info block
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* Pathname - Search pathname, in internal format
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* (as represented in the AML stream)
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* Type - Type associated with name
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* InterpreterMode - IMODE_LOAD_PASS2 => add name if not found
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* Flags - Flags describing the search restrictions
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* WalkState - Current state of the walk
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* ReturnNode - Where the Node is placed (if found
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* or created successfully)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Find or enter the passed name in the name space.
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* Log an error if name not found in Exec mode.
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*
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* MUTEX: Assumes namespace is locked.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsLookup (
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ACPI_GENERIC_STATE *ScopeInfo,
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char *Pathname,
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ACPI_OBJECT_TYPE Type,
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ACPI_INTERPRETER_MODE InterpreterMode,
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UINT32 Flags,
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ACPI_WALK_STATE *WalkState,
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ACPI_NAMESPACE_NODE **ReturnNode)
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{
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ACPI_STATUS Status;
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char *Path = Pathname;
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ACPI_NAMESPACE_NODE *PrefixNode;
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ACPI_NAMESPACE_NODE *CurrentNode = NULL;
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ACPI_NAMESPACE_NODE *ThisNode = NULL;
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UINT32 NumSegments;
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UINT32 NumCarats;
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ACPI_NAME SimpleName;
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ACPI_OBJECT_TYPE TypeToCheckFor;
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ACPI_OBJECT_TYPE ThisSearchType;
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UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT;
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UINT32 LocalFlags;
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ACPI_FUNCTION_TRACE (NsLookup);
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if (!ReturnNode)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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LocalFlags = Flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_SEARCH_PARENT);
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*ReturnNode = ACPI_ENTRY_NOT_FOUND;
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AcpiGbl_NsLookupCount++;
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if (!AcpiGbl_RootNode)
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{
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return_ACPI_STATUS (AE_NO_NAMESPACE);
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}
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/*
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* Get the prefix scope.
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* A null scope means use the root scope
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*/
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if ((!ScopeInfo) ||
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(!ScopeInfo->Scope.Node))
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Null scope prefix, using root node (%p)\n",
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AcpiGbl_RootNode));
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PrefixNode = AcpiGbl_RootNode;
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}
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else
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{
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PrefixNode = ScopeInfo->Scope.Node;
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if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED)
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{
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ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]",
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PrefixNode, AcpiUtGetDescriptorName (PrefixNode)));
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return_ACPI_STATUS (AE_AML_INTERNAL);
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}
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if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE))
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{
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/*
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* This node might not be a actual "scope" node (such as a
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* Device/Method, etc.) It could be a Package or other object node.
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* Backup up the tree to find the containing scope node.
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*/
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while (!AcpiNsOpensScope (PrefixNode->Type) &&
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PrefixNode->Type != ACPI_TYPE_ANY)
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{
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PrefixNode = AcpiNsGetParentNode (PrefixNode);
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}
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}
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}
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/* Save type TBD: may be no longer necessary */
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TypeToCheckFor = Type;
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/*
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* Begin examination of the actual pathname
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*/
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if (!Pathname)
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{
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/* A Null NamePath is allowed and refers to the root */
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NumSegments = 0;
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ThisNode = AcpiGbl_RootNode;
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Path = "";
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Null Pathname (Zero segments), Flags=%X\n", Flags));
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}
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else
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{
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/*
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* Name pointer is valid (and must be in internal name format)
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*
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* Check for scope prefixes:
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*
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* As represented in the AML stream, a namepath consists of an
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* optional scope prefix followed by a name segment part.
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*
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* If present, the scope prefix is either a Root Prefix (in
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* which case the name is fully qualified), or one or more
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* Parent Prefixes (in which case the name's scope is relative
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* to the current scope).
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*/
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if (*Path == (UINT8) AML_ROOT_PREFIX)
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{
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/* Pathname is fully qualified, start from the root */
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ThisNode = AcpiGbl_RootNode;
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SearchParentFlag = ACPI_NS_NO_UPSEARCH;
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/* Point to name segment part */
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Path++;
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Path is absolute from root [%p]\n", ThisNode));
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}
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else
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{
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/* Pathname is relative to current scope, start there */
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Searching relative to prefix scope [%4.4s] (%p)\n",
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AcpiUtGetNodeName (PrefixNode), PrefixNode));
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/*
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* Handle multiple Parent Prefixes (carat) by just getting
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* the parent node for each prefix instance.
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*/
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ThisNode = PrefixNode;
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NumCarats = 0;
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while (*Path == (UINT8) AML_PARENT_PREFIX)
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{
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/* Name is fully qualified, no search rules apply */
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SearchParentFlag = ACPI_NS_NO_UPSEARCH;
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/*
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* Point past this prefix to the name segment
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* part or the next Parent Prefix
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*/
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Path++;
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/* Backup to the parent node */
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NumCarats++;
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ThisNode = AcpiNsGetParentNode (ThisNode);
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if (!ThisNode)
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{
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/* Current scope has no parent scope */
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ACPI_ERROR ((AE_INFO,
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"ACPI path has too many parent prefixes (^) - reached beyond root node"));
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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}
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if (SearchParentFlag == ACPI_NS_NO_UPSEARCH)
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{
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
|
|
"Search scope is [%4.4s], path has %d carat(s)\n",
|
|
AcpiUtGetNodeName (ThisNode), NumCarats));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Determine the number of ACPI name segments in this pathname.
|
|
*
|
|
* The segment part consists of either:
|
|
* - A Null name segment (0)
|
|
* - A DualNamePrefix followed by two 4-byte name segments
|
|
* - A MultiNamePrefix followed by a byte indicating the
|
|
* number of segments and the segments themselves.
|
|
* - A single 4-byte name segment
|
|
*
|
|
* Examine the name prefix opcode, if any, to determine the number of
|
|
* segments.
|
|
*/
|
|
switch (*Path)
|
|
{
|
|
case 0:
|
|
/*
|
|
* Null name after a root or parent prefixes. We already
|
|
* have the correct target node and there are no name segments.
|
|
*/
|
|
NumSegments = 0;
|
|
Type = ThisNode->Type;
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
|
|
"Prefix-only Pathname (Zero name segments), Flags=%X\n",
|
|
Flags));
|
|
break;
|
|
|
|
case AML_DUAL_NAME_PREFIX:
|
|
|
|
/* More than one NameSeg, search rules do not apply */
|
|
|
|
SearchParentFlag = ACPI_NS_NO_UPSEARCH;
|
|
|
|
/* Two segments, point to first name segment */
|
|
|
|
NumSegments = 2;
|
|
Path++;
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
|
|
"Dual Pathname (2 segments, Flags=%X)\n", Flags));
|
|
break;
|
|
|
|
case AML_MULTI_NAME_PREFIX_OP:
|
|
|
|
/* More than one NameSeg, search rules do not apply */
|
|
|
|
SearchParentFlag = ACPI_NS_NO_UPSEARCH;
|
|
|
|
/* Extract segment count, point to first name segment */
|
|
|
|
Path++;
|
|
NumSegments = (UINT32) (UINT8) *Path;
|
|
Path++;
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
|
|
"Multi Pathname (%d Segments, Flags=%X)\n",
|
|
NumSegments, Flags));
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* Not a Null name, no Dual or Multi prefix, hence there is
|
|
* only one name segment and Pathname is already pointing to it.
|
|
*/
|
|
NumSegments = 1;
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
|
|
"Simple Pathname (1 segment, Flags=%X)\n", Flags));
|
|
break;
|
|
}
|
|
|
|
ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path));
|
|
}
|
|
|
|
|
|
/*
|
|
* Search namespace for each segment of the name. Loop through and
|
|
* verify (or add to the namespace) each name segment.
|
|
*
|
|
* The object type is significant only at the last name
|
|
* segment. (We don't care about the types along the path, only
|
|
* the type of the final target object.)
|
|
*/
|
|
ThisSearchType = ACPI_TYPE_ANY;
|
|
CurrentNode = ThisNode;
|
|
while (NumSegments && CurrentNode)
|
|
{
|
|
NumSegments--;
|
|
if (!NumSegments)
|
|
{
|
|
/*
|
|
* This is the last segment, enable typechecking
|
|
*/
|
|
ThisSearchType = Type;
|
|
|
|
/*
|
|
* Only allow automatic parent search (search rules) if the caller
|
|
* requested it AND we have a single, non-fully-qualified NameSeg
|
|
*/
|
|
if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) &&
|
|
(Flags & ACPI_NS_SEARCH_PARENT))
|
|
{
|
|
LocalFlags |= ACPI_NS_SEARCH_PARENT;
|
|
}
|
|
|
|
/* Set error flag according to caller */
|
|
|
|
if (Flags & ACPI_NS_ERROR_IF_FOUND)
|
|
{
|
|
LocalFlags |= ACPI_NS_ERROR_IF_FOUND;
|
|
}
|
|
}
|
|
|
|
/* Extract one ACPI name from the front of the pathname */
|
|
|
|
ACPI_MOVE_32_TO_32 (&SimpleName, Path);
|
|
|
|
/* Try to find the single (4 character) ACPI name */
|
|
|
|
Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode,
|
|
InterpreterMode, ThisSearchType, LocalFlags, &ThisNode);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
if (Status == AE_NOT_FOUND)
|
|
{
|
|
/* Name not found in ACPI namespace */
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
|
|
"Name [%4.4s] not found in scope [%4.4s] %p\n",
|
|
(char *) &SimpleName, (char *) &CurrentNode->Name,
|
|
CurrentNode));
|
|
}
|
|
|
|
*ReturnNode = ThisNode;
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
/*
|
|
* Sanity typecheck of the target object:
|
|
*
|
|
* If 1) This is the last segment (NumSegments == 0)
|
|
* 2) And we are looking for a specific type
|
|
* (Not checking for TYPE_ANY)
|
|
* 3) Which is not an alias
|
|
* 4) Which is not a local type (TYPE_SCOPE)
|
|
* 5) And the type of target object is known (not TYPE_ANY)
|
|
* 6) And target object does not match what we are looking for
|
|
*
|
|
* Then we have a type mismatch. Just warn and ignore it.
|
|
*/
|
|
if ((NumSegments == 0) &&
|
|
(TypeToCheckFor != ACPI_TYPE_ANY) &&
|
|
(TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) &&
|
|
(TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) &&
|
|
(TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) &&
|
|
(ThisNode->Type != ACPI_TYPE_ANY) &&
|
|
(ThisNode->Type != TypeToCheckFor))
|
|
{
|
|
/* Complain about a type mismatch */
|
|
|
|
ACPI_WARNING ((AE_INFO,
|
|
"NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
|
|
ACPI_CAST_PTR (char, &SimpleName),
|
|
AcpiUtGetTypeName (ThisNode->Type),
|
|
AcpiUtGetTypeName (TypeToCheckFor)));
|
|
}
|
|
|
|
/*
|
|
* If this is the last name segment and we are not looking for a
|
|
* specific type, but the type of found object is known, use that type
|
|
* to see if it opens a scope.
|
|
*/
|
|
if ((NumSegments == 0) && (Type == ACPI_TYPE_ANY))
|
|
{
|
|
Type = ThisNode->Type;
|
|
}
|
|
|
|
/* Point to next name segment and make this node current */
|
|
|
|
Path += ACPI_NAME_SIZE;
|
|
CurrentNode = ThisNode;
|
|
}
|
|
|
|
/*
|
|
* Always check if we need to open a new scope
|
|
*/
|
|
if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState))
|
|
{
|
|
/*
|
|
* If entry is a type which opens a scope, push the new scope on the
|
|
* scope stack.
|
|
*/
|
|
if (AcpiNsOpensScope (Type))
|
|
{
|
|
Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
}
|
|
}
|
|
|
|
*ReturnNode = ThisNode;
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|