394 lines
13 KiB
C
394 lines
13 KiB
C
/******************************************************************************
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*
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* Module Name: pswalk - Parser routines to walk parsed op tree(s)
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* $Revision: 67 $
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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 - 2002, 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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#include "acpi.h"
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#include "acparser.h"
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#include "acdispat.h"
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME ("pswalk")
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsGetNextWalkOp
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*
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* PARAMETERS: WalkState - Current state of the walk
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* Op - Current Op to be walked
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* AscendingCallback - Procedure called when Op is complete
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get the next Op in a walk of the parse tree.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsGetNextWalkOp (
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ACPI_WALK_STATE *WalkState,
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ACPI_PARSE_OBJECT *Op,
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ACPI_PARSE_UPWARDS AscendingCallback)
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{
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ACPI_PARSE_OBJECT *Next;
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ACPI_PARSE_OBJECT *Parent;
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ACPI_PARSE_OBJECT *GrandParent;
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE_PTR ("PsGetNextWalkOp", Op);
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/* Check for a argument only if we are descending in the tree */
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if (WalkState->NextOpInfo != ACPI_NEXT_OP_UPWARD)
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{
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/* Look for an argument or child of the current op */
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Next = AcpiPsGetArg (Op, 0);
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if (Next)
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{
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/* Still going downward in tree (Op is not completed yet) */
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WalkState->PrevOp = Op;
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WalkState->NextOp = Next;
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WalkState->NextOpInfo = ACPI_NEXT_OP_DOWNWARD;
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return_ACPI_STATUS (AE_OK);
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}
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/*
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* No more children, this Op is complete. Save Next and Parent
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* in case the Op object gets deleted by the callback routine
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*/
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Next = Op->Common.Next;
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Parent = Op->Common.Parent;
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WalkState->Op = Op;
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WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
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WalkState->Opcode = Op->Common.AmlOpcode;
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Status = AscendingCallback (WalkState);
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/*
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* If we are back to the starting point, the walk is complete.
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*/
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if (Op == WalkState->Origin)
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{
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/* Reached the point of origin, the walk is complete */
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WalkState->PrevOp = Op;
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WalkState->NextOp = NULL;
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return_ACPI_STATUS (Status);
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}
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/*
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* Check for a sibling to the current op. A sibling means
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* we are still going "downward" in the tree.
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*/
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if (Next)
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{
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/* There is a sibling, it will be next */
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WalkState->PrevOp = Op;
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WalkState->NextOp = Next;
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WalkState->NextOpInfo = ACPI_NEXT_OP_DOWNWARD;
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/* Continue downward */
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return_ACPI_STATUS (Status);
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}
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/*
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* Drop into the loop below because we are moving upwards in
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* the tree
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*/
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}
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else
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{
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/*
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* We are resuming a walk, and we were (are) going upward in the tree.
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* So, we want to drop into the parent loop below.
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*/
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Parent = Op;
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}
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/*
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* Look for a sibling of the current Op's parent
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* Continue moving up the tree until we find a node that has not been
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* visited, or we get back to where we started.
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*/
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while (Parent)
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{
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/* We are moving up the tree, therefore this parent Op is complete */
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GrandParent = Parent->Common.Parent;
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Next = Parent->Common.Next;
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WalkState->Op = Parent;
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WalkState->OpInfo = AcpiPsGetOpcodeInfo (Parent->Common.AmlOpcode);
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WalkState->Opcode = Parent->Common.AmlOpcode;
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Status = AscendingCallback (WalkState);
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/*
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* If we are back to the starting point, the walk is complete.
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*/
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if (Parent == WalkState->Origin)
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{
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/* Reached the point of origin, the walk is complete */
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WalkState->PrevOp = Parent;
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WalkState->NextOp = NULL;
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return_ACPI_STATUS (Status);
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}
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/*
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* If there is a sibling to this parent (it is not the starting point
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* Op), then we will visit it.
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*/
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if (Next)
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{
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/* found sibling of parent */
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WalkState->PrevOp = Parent;
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WalkState->NextOp = Next;
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WalkState->NextOpInfo = ACPI_NEXT_OP_DOWNWARD;
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return_ACPI_STATUS (Status);
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}
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/* No siblings, no errors, just move up one more level in the tree */
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Op = Parent;
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Parent = GrandParent;
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WalkState->PrevOp = Op;
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}
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/*
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* Got all the way to the top of the tree, we must be done!
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* However, the code should have terminated in the loop above
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*/
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WalkState->NextOp = NULL;
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsDeleteCompletedOp
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*
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* PARAMETERS: State - Walk state
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* Op - Completed op
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*
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* RETURN: AE_OK
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*
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* DESCRIPTION: Callback function for AcpiPsGetNextWalkOp(). Used during
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* AcpiPsDeleteParse tree to delete Op objects when all sub-objects
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* have been visited (and deleted.)
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsDeleteCompletedOp (
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ACPI_WALK_STATE *WalkState)
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{
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AcpiPsFreeOp (WalkState->Op);
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsDeleteParseTree
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*
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* PARAMETERS: SubtreeRoot - Root of tree (or subtree) to delete
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*
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* RETURN: None
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*
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* DESCRIPTION: Delete a portion of or an entire parse tree.
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*
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******************************************************************************/
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void
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AcpiPsDeleteParseTree (
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ACPI_PARSE_OBJECT *SubtreeRoot)
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{
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ACPI_WALK_STATE *WalkState;
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ACPI_THREAD_STATE *Thread;
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE_PTR ("PsDeleteParseTree", SubtreeRoot);
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if (!SubtreeRoot)
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{
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return_VOID;
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}
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/* Create and initialize a new walk list */
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Thread = AcpiUtCreateThreadState ();
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if (!Thread)
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{
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return_VOID;
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}
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WalkState = AcpiDsCreateWalkState (TABLE_ID_DSDT, NULL, NULL, Thread);
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if (!WalkState)
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{
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return_VOID;
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}
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WalkState->ParseFlags = 0;
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WalkState->DescendingCallback = NULL;
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WalkState->AscendingCallback = NULL;
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WalkState->Origin = SubtreeRoot;
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WalkState->NextOp = SubtreeRoot;
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/* Head downward in the tree */
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WalkState->NextOpInfo = ACPI_NEXT_OP_DOWNWARD;
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/* Visit all nodes in the subtree */
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while (WalkState->NextOp)
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{
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Status = AcpiPsGetNextWalkOp (WalkState, WalkState->NextOp,
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AcpiPsDeleteCompletedOp);
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if (ACPI_FAILURE (Status))
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{
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break;
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}
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}
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/* We are done with this walk */
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AcpiUtDeleteGenericState (ACPI_CAST_PTR (ACPI_GENERIC_STATE, Thread));
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AcpiDsDeleteWalkState (WalkState);
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return_VOID;
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}
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