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NetBSD/sys/dev/acpi/acpica/Subsystem/pswalk.c

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/******************************************************************************
*
* Module Name: pswalk - Parser routines to walk parsed op tree(s)
* xRevision: 70 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2004, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pswalk.c,v 1.10 2004/02/14 16:57:25 kochi Exp $");
#include "acpi.h"
#include "acparser.h"
#include "acdispat.h"
#define _COMPONENT ACPI_PARSER
ACPI_MODULE_NAME ("pswalk")
/*******************************************************************************
*
* FUNCTION: AcpiPsGetNextWalkOp
*
* PARAMETERS: WalkState - Current state of the walk
* Op - Current Op to be walked
* AscendingCallback - Procedure called when Op is complete
*
* RETURN: Status
*
* DESCRIPTION: Get the next Op in a walk of the parse tree.
*
******************************************************************************/
ACPI_STATUS
AcpiPsGetNextWalkOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op,
ACPI_PARSE_UPWARDS AscendingCallback)
{
ACPI_PARSE_OBJECT *Next;
ACPI_PARSE_OBJECT *Parent;
ACPI_PARSE_OBJECT *GrandParent;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE_PTR ("PsGetNextWalkOp", Op);
/* Check for a argument only if we are descending in the tree */
if (WalkState->NextOpInfo != ACPI_NEXT_OP_UPWARD)
{
/* Look for an argument or child of the current op */
Next = AcpiPsGetArg (Op, 0);
if (Next)
{
/* Still going downward in tree (Op is not completed yet) */
WalkState->PrevOp = Op;
WalkState->NextOp = Next;
WalkState->NextOpInfo = ACPI_NEXT_OP_DOWNWARD;
return_ACPI_STATUS (AE_OK);
}
/*
* No more children, this Op is complete. Save Next and Parent
* in case the Op object gets deleted by the callback routine
*/
Next = Op->Common.Next;
Parent = Op->Common.Parent;
WalkState->Op = Op;
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
WalkState->Opcode = Op->Common.AmlOpcode;
Status = AscendingCallback (WalkState);
/*
* If we are back to the starting point, the walk is complete.
*/
if (Op == WalkState->Origin)
{
/* Reached the point of origin, the walk is complete */
WalkState->PrevOp = Op;
WalkState->NextOp = NULL;
return_ACPI_STATUS (Status);
}
/*
* Check for a sibling to the current op. A sibling means
* we are still going "downward" in the tree.
*/
if (Next)
{
/* There is a sibling, it will be next */
WalkState->PrevOp = Op;
WalkState->NextOp = Next;
WalkState->NextOpInfo = ACPI_NEXT_OP_DOWNWARD;
/* Continue downward */
return_ACPI_STATUS (Status);
}
/*
* Drop into the loop below because we are moving upwards in
* the tree
*/
}
else
{
/*
* We are resuming a walk, and we were (are) going upward in the tree.
* So, we want to drop into the parent loop below.
*/
Parent = Op;
}
/*
* Look for a sibling of the current Op's parent
* Continue moving up the tree until we find a node that has not been
* visited, or we get back to where we started.
*/
while (Parent)
{
/* We are moving up the tree, therefore this parent Op is complete */
GrandParent = Parent->Common.Parent;
Next = Parent->Common.Next;
WalkState->Op = Parent;
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Parent->Common.AmlOpcode);
WalkState->Opcode = Parent->Common.AmlOpcode;
Status = AscendingCallback (WalkState);
/*
* If we are back to the starting point, the walk is complete.
*/
if (Parent == WalkState->Origin)
{
/* Reached the point of origin, the walk is complete */
WalkState->PrevOp = Parent;
WalkState->NextOp = NULL;
return_ACPI_STATUS (Status);
}
/*
* If there is a sibling to this parent (it is not the starting point
* Op), then we will visit it.
*/
if (Next)
{
/* found sibling of parent */
WalkState->PrevOp = Parent;
WalkState->NextOp = Next;
WalkState->NextOpInfo = ACPI_NEXT_OP_DOWNWARD;
return_ACPI_STATUS (Status);
}
/* No siblings, no errors, just move up one more level in the tree */
Op = Parent;
Parent = GrandParent;
WalkState->PrevOp = Op;
}
/*
* Got all the way to the top of the tree, we must be done!
* However, the code should have terminated in the loop above
*/
WalkState->NextOp = NULL;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsDeleteCompletedOp
*
* PARAMETERS: State - Walk state
* Op - Completed op
*
* RETURN: AE_OK
*
* DESCRIPTION: Callback function for AcpiPsGetNextWalkOp(). Used during
* AcpiPsDeleteParse tree to delete Op objects when all sub-objects
* have been visited (and deleted.)
*
******************************************************************************/
ACPI_STATUS
AcpiPsDeleteCompletedOp (
ACPI_WALK_STATE *WalkState)
{
AcpiPsFreeOp (WalkState->Op);
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsDeleteParseTree
*
* PARAMETERS: SubtreeRoot - Root of tree (or subtree) to delete
*
* RETURN: None
*
* DESCRIPTION: Delete a portion of or an entire parse tree.
*
******************************************************************************/
void
AcpiPsDeleteParseTree (
ACPI_PARSE_OBJECT *SubtreeRoot)
{
ACPI_WALK_STATE *WalkState;
ACPI_THREAD_STATE *Thread;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE_PTR ("PsDeleteParseTree", SubtreeRoot);
if (!SubtreeRoot)
{
return_VOID;
}
/* Create and initialize a new walk list */
Thread = AcpiUtCreateThreadState ();
if (!Thread)
{
return_VOID;
}
WalkState = AcpiDsCreateWalkState (0, NULL, NULL, Thread);
if (!WalkState)
{
return_VOID;
}
WalkState->ParseFlags = 0;
WalkState->DescendingCallback = NULL;
WalkState->AscendingCallback = NULL;
WalkState->Origin = SubtreeRoot;
WalkState->NextOp = SubtreeRoot;
/* Head downward in the tree */
WalkState->NextOpInfo = ACPI_NEXT_OP_DOWNWARD;
/* Visit all nodes in the subtree */
while (WalkState->NextOp)
{
Status = AcpiPsGetNextWalkOp (WalkState, WalkState->NextOp,
AcpiPsDeleteCompletedOp);
if (ACPI_FAILURE (Status))
{
break;
}
}
/* We are done with this walk */
AcpiUtDeleteGenericState (ACPI_CAST_PTR (ACPI_GENERIC_STATE, Thread));
AcpiDsDeleteWalkState (WalkState);
return_VOID;
}
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