forked from KolibriOS/kolibrios
792 lines
26 KiB
C
792 lines
26 KiB
C
/******************************************************************************
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*
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* Module Name: psparse - Parser top level AML parse routines
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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 - 2010, 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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/*
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* Parse the AML and build an operation tree as most interpreters,
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* like Perl, do. Parsing is done by hand rather than with a YACC
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* generated parser to tightly constrain stack and dynamic memory
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* usage. At the same time, parsing is kept flexible and the code
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* fairly compact by parsing based on a list of AML opcode
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* templates in AmlOpInfo[]
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "acparser.h"
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#include "acdispat.h"
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#include "amlcode.h"
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#include "acnamesp.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME ("psparse")
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsGetOpcodeSize
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*
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* PARAMETERS: Opcode - An AML opcode
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*
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* RETURN: Size of the opcode, in bytes (1 or 2)
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*
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* DESCRIPTION: Get the size of the current opcode.
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*
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******************************************************************************/
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UINT32
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AcpiPsGetOpcodeSize (
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UINT32 Opcode)
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{
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/* Extended (2-byte) opcode if > 255 */
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if (Opcode > 0x00FF)
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{
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return (2);
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}
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/* Otherwise, just a single byte opcode */
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return (1);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsPeekOpcode
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*
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* PARAMETERS: ParserState - A parser state object
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*
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* RETURN: Next AML opcode
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*
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* DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
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*
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******************************************************************************/
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UINT16
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AcpiPsPeekOpcode (
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ACPI_PARSE_STATE *ParserState)
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{
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UINT8 *Aml;
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UINT16 Opcode;
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Aml = ParserState->Aml;
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Opcode = (UINT16) ACPI_GET8 (Aml);
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if (Opcode == AML_EXTENDED_OP_PREFIX)
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{
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/* Extended opcode, get the second opcode byte */
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Aml++;
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Opcode = (UINT16) ((Opcode << 8) | ACPI_GET8 (Aml));
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}
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return (Opcode);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsCompleteThisOp
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*
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* PARAMETERS: WalkState - Current State
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* Op - Op to complete
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*
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* RETURN: Status
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*
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* DESCRIPTION: Perform any cleanup at the completion of an Op.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsCompleteThisOp (
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ACPI_WALK_STATE *WalkState,
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ACPI_PARSE_OBJECT *Op)
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{
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ACPI_PARSE_OBJECT *Prev;
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ACPI_PARSE_OBJECT *Next;
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const ACPI_OPCODE_INFO *ParentInfo;
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ACPI_PARSE_OBJECT *ReplacementOp = NULL;
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ACPI_STATUS Status = AE_OK;
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ACPI_FUNCTION_TRACE_PTR (PsCompleteThisOp, Op);
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/* Check for null Op, can happen if AML code is corrupt */
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if (!Op)
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{
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return_ACPI_STATUS (AE_OK); /* OK for now */
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}
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/* Delete this op and the subtree below it if asked to */
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if (((WalkState->ParseFlags & ACPI_PARSE_TREE_MASK) != ACPI_PARSE_DELETE_TREE) ||
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(WalkState->OpInfo->Class == AML_CLASS_ARGUMENT))
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{
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return_ACPI_STATUS (AE_OK);
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}
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/* Make sure that we only delete this subtree */
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if (Op->Common.Parent)
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{
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Prev = Op->Common.Parent->Common.Value.Arg;
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if (!Prev)
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{
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/* Nothing more to do */
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goto Cleanup;
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}
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/*
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* Check if we need to replace the operator and its subtree
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* with a return value op (placeholder op)
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*/
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ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode);
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switch (ParentInfo->Class)
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{
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case AML_CLASS_CONTROL:
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break;
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case AML_CLASS_CREATE:
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/*
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* These opcodes contain TermArg operands. The current
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* op must be replaced by a placeholder return op
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*/
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ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
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if (!ReplacementOp)
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{
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Status = AE_NO_MEMORY;
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}
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break;
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case AML_CLASS_NAMED_OBJECT:
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/*
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* These opcodes contain TermArg operands. The current
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* op must be replaced by a placeholder return op
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*/
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if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP) ||
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(Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP))
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{
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ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
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if (!ReplacementOp)
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{
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Status = AE_NO_MEMORY;
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}
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}
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else if ((Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) &&
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(WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2))
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{
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if ((Op->Common.AmlOpcode == AML_BUFFER_OP) ||
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(Op->Common.AmlOpcode == AML_PACKAGE_OP) ||
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(Op->Common.AmlOpcode == AML_VAR_PACKAGE_OP))
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{
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ReplacementOp = AcpiPsAllocOp (Op->Common.AmlOpcode);
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if (!ReplacementOp)
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{
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Status = AE_NO_MEMORY;
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}
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else
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{
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ReplacementOp->Named.Data = Op->Named.Data;
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ReplacementOp->Named.Length = Op->Named.Length;
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}
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}
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}
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break;
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default:
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ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
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if (!ReplacementOp)
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{
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Status = AE_NO_MEMORY;
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}
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}
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/* We must unlink this op from the parent tree */
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if (Prev == Op)
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{
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/* This op is the first in the list */
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if (ReplacementOp)
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{
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ReplacementOp->Common.Parent = Op->Common.Parent;
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ReplacementOp->Common.Value.Arg = NULL;
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ReplacementOp->Common.Node = Op->Common.Node;
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Op->Common.Parent->Common.Value.Arg = ReplacementOp;
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ReplacementOp->Common.Next = Op->Common.Next;
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}
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else
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{
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Op->Common.Parent->Common.Value.Arg = Op->Common.Next;
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}
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}
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/* Search the parent list */
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else while (Prev)
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{
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/* Traverse all siblings in the parent's argument list */
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Next = Prev->Common.Next;
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if (Next == Op)
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{
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if (ReplacementOp)
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{
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ReplacementOp->Common.Parent = Op->Common.Parent;
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ReplacementOp->Common.Value.Arg = NULL;
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ReplacementOp->Common.Node = Op->Common.Node;
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Prev->Common.Next = ReplacementOp;
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ReplacementOp->Common.Next = Op->Common.Next;
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Next = NULL;
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}
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else
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{
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Prev->Common.Next = Op->Common.Next;
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Next = NULL;
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}
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}
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Prev = Next;
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}
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}
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Cleanup:
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/* Now we can actually delete the subtree rooted at Op */
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AcpiPsDeleteParseTree (Op);
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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: AcpiPsNextParseState
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*
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* PARAMETERS: WalkState - Current state
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* Op - Current parse op
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* CallbackStatus - Status from previous operation
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*
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* RETURN: Status
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*
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* DESCRIPTION: Update the parser state based upon the return exception from
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* the parser callback.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsNextParseState (
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ACPI_WALK_STATE *WalkState,
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ACPI_PARSE_OBJECT *Op,
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ACPI_STATUS CallbackStatus)
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{
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ACPI_PARSE_STATE *ParserState = &WalkState->ParserState;
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ACPI_STATUS Status = AE_CTRL_PENDING;
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ACPI_FUNCTION_TRACE_PTR (PsNextParseState, Op);
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switch (CallbackStatus)
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{
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case AE_CTRL_TERMINATE:
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/*
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* A control method was terminated via a RETURN statement.
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* The walk of this method is complete.
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*/
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ParserState->Aml = ParserState->AmlEnd;
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Status = AE_CTRL_TERMINATE;
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break;
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case AE_CTRL_BREAK:
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ParserState->Aml = WalkState->AmlLastWhile;
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WalkState->ControlState->Common.Value = FALSE;
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Status = AE_CTRL_BREAK;
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break;
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case AE_CTRL_CONTINUE:
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ParserState->Aml = WalkState->AmlLastWhile;
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Status = AE_CTRL_CONTINUE;
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break;
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case AE_CTRL_PENDING:
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ParserState->Aml = WalkState->AmlLastWhile;
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break;
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#if 0
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case AE_CTRL_SKIP:
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ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
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Status = AE_OK;
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break;
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#endif
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case AE_CTRL_TRUE:
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/*
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* Predicate of an IF was true, and we are at the matching ELSE.
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* Just close out this package
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*/
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ParserState->Aml = AcpiPsGetNextPackageEnd (ParserState);
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Status = AE_CTRL_PENDING;
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break;
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case AE_CTRL_FALSE:
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/*
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* Either an IF/WHILE Predicate was false or we encountered a BREAK
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* opcode. In both cases, we do not execute the rest of the
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* package; We simply close out the parent (finishing the walk of
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* this branch of the tree) and continue execution at the parent
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* level.
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*/
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ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
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/* In the case of a BREAK, just force a predicate (if any) to FALSE */
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WalkState->ControlState->Common.Value = FALSE;
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Status = AE_CTRL_END;
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break;
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case AE_CTRL_TRANSFER:
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/* A method call (invocation) -- transfer control */
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Status = AE_CTRL_TRANSFER;
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WalkState->PrevOp = Op;
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WalkState->MethodCallOp = Op;
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WalkState->MethodCallNode = (Op->Common.Value.Arg)->Common.Node;
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/* Will return value (if any) be used by the caller? */
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WalkState->ReturnUsed = AcpiDsIsResultUsed (Op, WalkState);
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break;
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default:
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Status = CallbackStatus;
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if ((CallbackStatus & AE_CODE_MASK) == AE_CODE_CONTROL)
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{
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Status = AE_OK;
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}
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break;
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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: AcpiPsParseAml
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*
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* PARAMETERS: WalkState - Current state
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*
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*
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* RETURN: Status
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*
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* DESCRIPTION: Parse raw AML and return a tree of ops
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsParseAml (
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ACPI_WALK_STATE *WalkState)
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{
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ACPI_STATUS Status;
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ACPI_THREAD_STATE *Thread;
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ACPI_THREAD_STATE *PrevWalkList = AcpiGbl_CurrentWalkList;
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ACPI_WALK_STATE *PreviousWalkState;
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ACPI_FUNCTION_TRACE (PsParseAml);
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
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"Entered with WalkState=%p Aml=%p size=%X\n",
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WalkState, WalkState->ParserState.Aml,
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WalkState->ParserState.AmlSize));
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if (!WalkState->ParserState.Aml)
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{
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return_ACPI_STATUS (AE_NULL_OBJECT);
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}
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/* Create and initialize a new thread state */
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Thread = AcpiUtCreateThreadState ();
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if (!Thread)
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{
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if (WalkState->MethodDesc)
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{
|
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/* Executing a control method - additional cleanup */
|
|
|
|
AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
|
|
}
|
|
|
|
AcpiDsDeleteWalkState (WalkState);
|
|
return_ACPI_STATUS (AE_NO_MEMORY);
|
|
}
|
|
|
|
WalkState->Thread = Thread;
|
|
|
|
/*
|
|
* If executing a method, the starting SyncLevel is this method's
|
|
* SyncLevel
|
|
*/
|
|
if (WalkState->MethodDesc)
|
|
{
|
|
WalkState->Thread->CurrentSyncLevel = WalkState->MethodDesc->Method.SyncLevel;
|
|
}
|
|
|
|
AcpiDsPushWalkState (WalkState, Thread);
|
|
|
|
/*
|
|
* This global allows the AML debugger to get a handle to the currently
|
|
* executing control method.
|
|
*/
|
|
AcpiGbl_CurrentWalkList = Thread;
|
|
|
|
/*
|
|
* Execute the walk loop as long as there is a valid Walk State. This
|
|
* handles nested control method invocations without recursion.
|
|
*/
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", WalkState));
|
|
|
|
Status = AE_OK;
|
|
while (WalkState)
|
|
{
|
|
if (ACPI_SUCCESS (Status))
|
|
{
|
|
/*
|
|
* The ParseLoop executes AML until the method terminates
|
|
* or calls another method.
|
|
*/
|
|
Status = AcpiPsParseLoop (WalkState);
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
|
|
"Completed one call to walk loop, %s State=%p\n",
|
|
AcpiFormatException (Status), WalkState));
|
|
|
|
if (Status == AE_CTRL_TRANSFER)
|
|
{
|
|
/*
|
|
* A method call was detected.
|
|
* Transfer control to the called control method
|
|
*/
|
|
Status = AcpiDsCallControlMethod (Thread, WalkState, NULL);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
Status = AcpiDsMethodError (Status, WalkState);
|
|
}
|
|
|
|
/*
|
|
* If the transfer to the new method method call worked, a new walk
|
|
* state was created -- get it
|
|
*/
|
|
WalkState = AcpiDsGetCurrentWalkState (Thread);
|
|
continue;
|
|
}
|
|
else if (Status == AE_CTRL_TERMINATE)
|
|
{
|
|
Status = AE_OK;
|
|
}
|
|
else if ((Status != AE_OK) && (WalkState->MethodDesc))
|
|
{
|
|
/* Either the method parse or actual execution failed */
|
|
|
|
ACPI_ERROR_METHOD ("Method parse/execution failed",
|
|
WalkState->MethodNode, NULL, Status);
|
|
|
|
/* Check for possible multi-thread reentrancy problem */
|
|
|
|
if ((Status == AE_ALREADY_EXISTS) &&
|
|
(!WalkState->MethodDesc->Method.Mutex))
|
|
{
|
|
ACPI_INFO ((AE_INFO,
|
|
"Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error",
|
|
WalkState->MethodNode->Name.Ascii));
|
|
|
|
/*
|
|
* Method tried to create an object twice. The probable cause is
|
|
* that the method cannot handle reentrancy.
|
|
*
|
|
* The method is marked NotSerialized, but it tried to create
|
|
* a named object, causing the second thread entrance to fail.
|
|
* Workaround this problem by marking the method permanently
|
|
* as Serialized.
|
|
*/
|
|
WalkState->MethodDesc->Method.MethodFlags |= AML_METHOD_SERIALIZED;
|
|
WalkState->MethodDesc->Method.SyncLevel = 0;
|
|
}
|
|
}
|
|
|
|
/* We are done with this walk, move on to the parent if any */
|
|
|
|
WalkState = AcpiDsPopWalkState (Thread);
|
|
|
|
/* Reset the current scope to the beginning of scope stack */
|
|
|
|
AcpiDsScopeStackClear (WalkState);
|
|
|
|
/*
|
|
* If we just returned from the execution of a control method or if we
|
|
* encountered an error during the method parse phase, there's lots of
|
|
* cleanup to do
|
|
*/
|
|
if (((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) == ACPI_PARSE_EXECUTE) ||
|
|
(ACPI_FAILURE (Status)))
|
|
{
|
|
AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
|
|
}
|
|
|
|
/* Delete this walk state and all linked control states */
|
|
|
|
AcpiPsCleanupScope (&WalkState->ParserState);
|
|
PreviousWalkState = WalkState;
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
|
|
"ReturnValue=%p, ImplicitValue=%p State=%p\n",
|
|
WalkState->ReturnDesc, WalkState->ImplicitReturnObj, WalkState));
|
|
|
|
/* Check if we have restarted a preempted walk */
|
|
|
|
WalkState = AcpiDsGetCurrentWalkState (Thread);
|
|
if (WalkState)
|
|
{
|
|
if (ACPI_SUCCESS (Status))
|
|
{
|
|
/*
|
|
* There is another walk state, restart it.
|
|
* If the method return value is not used by the parent,
|
|
* The object is deleted
|
|
*/
|
|
if (!PreviousWalkState->ReturnDesc)
|
|
{
|
|
/*
|
|
* In slack mode execution, if there is no return value
|
|
* we should implicitly return zero (0) as a default value.
|
|
*/
|
|
if (AcpiGbl_EnableInterpreterSlack &&
|
|
!PreviousWalkState->ImplicitReturnObj)
|
|
{
|
|
PreviousWalkState->ImplicitReturnObj =
|
|
AcpiUtCreateIntegerObject ((UINT64) 0);
|
|
if (!PreviousWalkState->ImplicitReturnObj)
|
|
{
|
|
return_ACPI_STATUS (AE_NO_MEMORY);
|
|
}
|
|
}
|
|
|
|
/* Restart the calling control method */
|
|
|
|
Status = AcpiDsRestartControlMethod (WalkState,
|
|
PreviousWalkState->ImplicitReturnObj);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* We have a valid return value, delete any implicit
|
|
* return value.
|
|
*/
|
|
AcpiDsClearImplicitReturn (PreviousWalkState);
|
|
|
|
Status = AcpiDsRestartControlMethod (WalkState,
|
|
PreviousWalkState->ReturnDesc);
|
|
}
|
|
if (ACPI_SUCCESS (Status))
|
|
{
|
|
WalkState->WalkType |= ACPI_WALK_METHOD_RESTART;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* On error, delete any return object or implicit return */
|
|
|
|
AcpiUtRemoveReference (PreviousWalkState->ReturnDesc);
|
|
AcpiDsClearImplicitReturn (PreviousWalkState);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Just completed a 1st-level method, save the final internal return
|
|
* value (if any)
|
|
*/
|
|
else if (PreviousWalkState->CallerReturnDesc)
|
|
{
|
|
if (PreviousWalkState->ImplicitReturnObj)
|
|
{
|
|
*(PreviousWalkState->CallerReturnDesc) =
|
|
PreviousWalkState->ImplicitReturnObj;
|
|
}
|
|
else
|
|
{
|
|
/* NULL if no return value */
|
|
|
|
*(PreviousWalkState->CallerReturnDesc) =
|
|
PreviousWalkState->ReturnDesc;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (PreviousWalkState->ReturnDesc)
|
|
{
|
|
/* Caller doesn't want it, must delete it */
|
|
|
|
AcpiUtRemoveReference (PreviousWalkState->ReturnDesc);
|
|
}
|
|
if (PreviousWalkState->ImplicitReturnObj)
|
|
{
|
|
/* Caller doesn't want it, must delete it */
|
|
|
|
AcpiUtRemoveReference (PreviousWalkState->ImplicitReturnObj);
|
|
}
|
|
}
|
|
|
|
AcpiDsDeleteWalkState (PreviousWalkState);
|
|
}
|
|
|
|
/* Normal exit */
|
|
|
|
AcpiExReleaseAllMutexes (Thread);
|
|
AcpiUtDeleteGenericState (ACPI_CAST_PTR (ACPI_GENERIC_STATE, Thread));
|
|
AcpiGbl_CurrentWalkList = PrevWalkList;
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
|