9560b6dea8
- 99% of the code is Intel's ACPICA. The license is compliant with BSD and GNU and virtually all systems that use ACPI use this code, For instance it is part of the Linux kernel. - The only minix specific files are acpi.c osminixxf.c platform/acminix.h and include/minix/acpi.h - At the moment the driver does not register interrupt hooks which I believe is mainly for handling PnP, events like "battery level is low" and power management. Should not be difficult to add it if need be. - The interface to the outside world is virtually non-existent except a trivial message based service for PCI driver to query which device is connected to what IRQ line. This will evolve as more components start using this driver. VM, Scheduler and IOMMU are the possible users right now. - because of dependency on a native 64bit (long long, part of c99) it is compiled only with a gnu-like compilers which in case of Minix includes gcc llvm-gcc and clang
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,
|
|
"Entered with WalkState=%p Aml=%p size=%X\n",
|
|
WalkState, WalkState->ParserState.Aml,
|
|
WalkState->ParserState.AmlSize));
|
|
|
|
if (!WalkState->ParserState.Aml)
|
|
{
|
|
return_ACPI_STATUS (AE_NULL_OBJECT);
|
|
}
|
|
|
|
/* Create and initialize a new thread state */
|
|
|
|
Thread = AcpiUtCreateThreadState ();
|
|
if (!Thread)
|
|
{
|
|
if (WalkState->MethodDesc)
|
|
{
|
|
/* 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);
|
|
}
|
|
|
|
|