FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/dispatcher/dswstate.c

     /******************************************************************************
      *
      * Module Name: dswstate - Dispatcher parse tree walk management routines
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, 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.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acparser.h>
   #include <contrib/dev/acpica/include/acdispat.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   
   #define _COMPONENT          ACPI_DISPATCHER
           ACPI_MODULE_NAME    ("dswstate")
   
   /* Local prototypes */
   
   static ACPI_STATUS
   AcpiDsResultStackPush (
       ACPI_WALK_STATE         *WalkState);
   
   static ACPI_STATUS
   AcpiDsResultStackPop (
       ACPI_WALK_STATE         *WalkState);
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsResultPop
    *
    * PARAMETERS:  Object              - Where to return the popped object
    *              WalkState           - Current Walk state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Pop an object off the top of this walk's result stack
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsResultPop (
       ACPI_OPERAND_OBJECT     **Object,
       ACPI_WALK_STATE         *WalkState)
   {
       UINT32                  Index;
       ACPI_GENERIC_STATE      *State;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_NAME (DsResultPop);
   
   
       State = WalkState->Results;
   
       /* Incorrect state of result stack */
   
       if (State && !WalkState->ResultCount)
       {
           ACPI_ERROR ((AE_INFO, "No results on result stack"));
           return (AE_AML_INTERNAL);
       }
   
       if (!State && WalkState->ResultCount)
       {
           ACPI_ERROR ((AE_INFO, "No result state for result stack"));
           return (AE_AML_INTERNAL);
       }
   
       /* Empty result stack */
   
       if (!State)
       {
           ACPI_ERROR ((AE_INFO, "Result stack is empty! State=%p", WalkState));
           return (AE_AML_NO_RETURN_VALUE);
       }
   
       /* Return object of the top element and clean that top element result stack */
   
       WalkState->ResultCount--;
       Index = (UINT32) WalkState->ResultCount % ACPI_RESULTS_FRAME_OBJ_NUM;
   
       *Object = State->Results.ObjDesc [Index];
       if (!*Object)
       {
           ACPI_ERROR ((AE_INFO, "No result objects on result stack, State=%p",
               WalkState));
           return (AE_AML_NO_RETURN_VALUE);
       }
   
       State->Results.ObjDesc [Index] = NULL;
       if (Index == 0)
       {
           Status = AcpiDsResultStackPop (WalkState);
           if (ACPI_FAILURE (Status))
           {
               return (Status);
           }
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
           "Obj=%p [%s] Index=%X State=%p Num=%X\n", *Object,
           AcpiUtGetObjectTypeName (*Object),
           Index, WalkState, WalkState->ResultCount));
   
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsResultPush
    *
    * PARAMETERS:  Object              - Where to return the popped object
    *              WalkState           - Current Walk state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Push an object onto the current result stack
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsResultPush (
       ACPI_OPERAND_OBJECT     *Object,
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_GENERIC_STATE      *State;
       ACPI_STATUS             Status;
       UINT32                  Index;
   
   
       ACPI_FUNCTION_NAME (DsResultPush);
   
   
       if (WalkState->ResultCount > WalkState->ResultSize)
       {
           ACPI_ERROR ((AE_INFO, "Result stack is full"));
           return (AE_AML_INTERNAL);
       }
       else if (WalkState->ResultCount == WalkState->ResultSize)
       {
           /* Extend the result stack */
   
           Status = AcpiDsResultStackPush (WalkState);
           if (ACPI_FAILURE (Status))
           {
               ACPI_ERROR ((AE_INFO, "Failed to extend the result stack"));
               return (Status);
           }
       }
   
       if (!(WalkState->ResultCount < WalkState->ResultSize))
       {
           ACPI_ERROR ((AE_INFO, "No free elements in result stack"));
           return (AE_AML_INTERNAL);
       }
   
       State = WalkState->Results;
       if (!State)
       {
           ACPI_ERROR ((AE_INFO, "No result stack frame during push"));
           return (AE_AML_INTERNAL);
       }
   
       if (!Object)
       {
           ACPI_ERROR ((AE_INFO,
               "Null Object! Obj=%p State=%p Num=%u",
               Object, WalkState, WalkState->ResultCount));
           return (AE_BAD_PARAMETER);
       }
   
       /* Assign the address of object to the top free element of result stack */
   
       Index = (UINT32) WalkState->ResultCount % ACPI_RESULTS_FRAME_OBJ_NUM;
       State->Results.ObjDesc [Index] = Object;
       WalkState->ResultCount++;
   
       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
           Object, AcpiUtGetObjectTypeName ((ACPI_OPERAND_OBJECT *) Object),
           WalkState, WalkState->ResultCount, WalkState->CurrentResult));
   
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsResultStackPush
    *
    * PARAMETERS:  WalkState           - Current Walk state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Push an object onto the WalkState result stack
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcpiDsResultStackPush (
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_GENERIC_STATE      *State;
   
   
       ACPI_FUNCTION_NAME (DsResultStackPush);
   
   
       /* Check for stack overflow */
   
       if (((UINT32) WalkState->ResultSize + ACPI_RESULTS_FRAME_OBJ_NUM) >
           ACPI_RESULTS_OBJ_NUM_MAX)
       {
           ACPI_ERROR ((AE_INFO, "Result stack overflow: State=%p Num=%u",
               WalkState, WalkState->ResultSize));
           return (AE_STACK_OVERFLOW);
       }
   
       State = AcpiUtCreateGenericState ();
       if (!State)
       {
           return (AE_NO_MEMORY);
       }
   
       State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_RESULT;
       AcpiUtPushGenericState (&WalkState->Results, State);
   
       /* Increase the length of the result stack by the length of frame */
   
       WalkState->ResultSize += ACPI_RESULTS_FRAME_OBJ_NUM;
   
       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Results=%p State=%p\n",
           State, WalkState));
   
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsResultStackPop
    *
    * PARAMETERS:  WalkState           - Current Walk state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Pop an object off of the WalkState result stack
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcpiDsResultStackPop (
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_GENERIC_STATE      *State;
   
   
       ACPI_FUNCTION_NAME (DsResultStackPop);
   
   
       /* Check for stack underflow */
   
       if (WalkState->Results == NULL)
       {
           ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
               "Result stack underflow - State=%p\n", WalkState));
           return (AE_AML_NO_OPERAND);
       }
   
       if (WalkState->ResultSize < ACPI_RESULTS_FRAME_OBJ_NUM)
       {
           ACPI_ERROR ((AE_INFO, "Insufficient result stack size"));
           return (AE_AML_INTERNAL);
       }
   
       State = AcpiUtPopGenericState (&WalkState->Results);
       AcpiUtDeleteGenericState (State);
   
       /* Decrease the length of result stack by the length of frame */
   
       WalkState->ResultSize -= ACPI_RESULTS_FRAME_OBJ_NUM;
   
       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
           "Result=%p RemainingResults=%X State=%p\n",
           State, WalkState->ResultCount, WalkState));
   
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsObjStackPush
    *
    * PARAMETERS:  Object              - Object to push
    *              WalkState           - Current Walk state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Push an object onto this walk's object/operand stack
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsObjStackPush (
       void                    *Object,
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_FUNCTION_NAME (DsObjStackPush);
   
   
       /* Check for stack overflow */
   
       if (WalkState->NumOperands >= ACPI_OBJ_NUM_OPERANDS)
       {
           ACPI_ERROR ((AE_INFO,
               "Object stack overflow! Obj=%p State=%p #Ops=%u",
               Object, WalkState, WalkState->NumOperands));
           return (AE_STACK_OVERFLOW);
       }
   
       /* Put the object onto the stack */
   
       WalkState->Operands [WalkState->OperandIndex] = Object;
       WalkState->NumOperands++;
   
       /* For the usual order of filling the operand stack */
   
       WalkState->OperandIndex++;
   
       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
           Object, AcpiUtGetObjectTypeName ((ACPI_OPERAND_OBJECT *) Object),
           WalkState, WalkState->NumOperands));
   
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsObjStackPop
    *
    * PARAMETERS:  PopCount            - Number of objects/entries to pop
    *              WalkState           - Current Walk state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
    *              deleted by this routine.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsObjStackPop (
       UINT32                  PopCount,
       ACPI_WALK_STATE         *WalkState)
   {
       UINT32                  i;
   
   
       ACPI_FUNCTION_NAME (DsObjStackPop);
   
   
       for (i = 0; i < PopCount; i++)
       {
           /* Check for stack underflow */
   
           if (WalkState->NumOperands == 0)
           {
               ACPI_ERROR ((AE_INFO,
                   "Object stack underflow! Count=%X State=%p #Ops=%u",
                   PopCount, WalkState, WalkState->NumOperands));
               return (AE_STACK_UNDERFLOW);
           }
   
           /* Just set the stack entry to null */
   
           WalkState->NumOperands--;
           WalkState->Operands [WalkState->NumOperands] = NULL;
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n",
           PopCount, WalkState, WalkState->NumOperands));
   
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsObjStackPopAndDelete
    *
    * PARAMETERS:  PopCount            - Number of objects/entries to pop
    *              WalkState           - Current Walk state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Pop this walk's object stack and delete each object that is
    *              popped off.
    *
    ******************************************************************************/
   
   void
   AcpiDsObjStackPopAndDelete (
       UINT32                  PopCount,
       ACPI_WALK_STATE         *WalkState)
   {
       INT32                   i;
       ACPI_OPERAND_OBJECT     *ObjDesc;
   
   
       ACPI_FUNCTION_NAME (DsObjStackPopAndDelete);
   
   
       if (PopCount == 0)
       {
           return;
       }
   
       for (i = (INT32) PopCount - 1; i >= 0; i--)
       {
           if (WalkState->NumOperands == 0)
           {
               return;
           }
   
           /* Pop the stack and delete an object if present in this stack entry */
   
           WalkState->NumOperands--;
           ObjDesc = WalkState->Operands [i];
           if (ObjDesc)
           {
               AcpiUtRemoveReference (WalkState->Operands [i]);
               WalkState->Operands [i] = NULL;
           }
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
           PopCount, WalkState, WalkState->NumOperands));
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsGetCurrentWalkState
    *
    * PARAMETERS:  Thread          - Get current active state for this Thread
    *
    * RETURN:      Pointer to the current walk state
    *
    * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
    *              walk state.)
    *
    ******************************************************************************/
   
   ACPI_WALK_STATE *
   AcpiDsGetCurrentWalkState (
       ACPI_THREAD_STATE       *Thread)
   {
       ACPI_FUNCTION_NAME (DsGetCurrentWalkState);
   
   
       if (!Thread)
       {
           return (NULL);
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Current WalkState %p\n",
           Thread->WalkStateList));
   
       return (Thread->WalkStateList);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsPushWalkState
    *
    * PARAMETERS:  WalkState       - State to push
    *              Thread          - Thread state object
    *
    * RETURN:      None
    *
    * DESCRIPTION: Place the Thread state at the head of the state list
    *
    ******************************************************************************/
   
   void
   AcpiDsPushWalkState (
       ACPI_WALK_STATE         *WalkState,
       ACPI_THREAD_STATE       *Thread)
   {
       ACPI_FUNCTION_TRACE (DsPushWalkState);
   
   
       WalkState->Next = Thread->WalkStateList;
       Thread->WalkStateList = WalkState;
   
       return_VOID;
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsPopWalkState
    *
    * PARAMETERS:  Thread      - Current thread state
    *
    * RETURN:      A WalkState object popped from the thread's stack
    *
    * DESCRIPTION: Remove and return the walkstate object that is at the head of
    *              the walk stack for the given walk list. NULL indicates that
    *              the list is empty.
    *
    ******************************************************************************/
   
   ACPI_WALK_STATE *
   AcpiDsPopWalkState (
       ACPI_THREAD_STATE       *Thread)
   {
       ACPI_WALK_STATE         *WalkState;
   
   
       ACPI_FUNCTION_TRACE (DsPopWalkState);
   
   
       WalkState = Thread->WalkStateList;
   
       if (WalkState)
       {
           /* Next walk state becomes the current walk state */
   
           Thread->WalkStateList = WalkState->Next;
   
           /*
            * Don't clear the NEXT field, this serves as an indicator
            * that there is a parent WALK STATE
            * Do Not: WalkState->Next = NULL;
            */
       }
   
       return_PTR (WalkState);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsCreateWalkState
    *
    * PARAMETERS:  OwnerId         - ID for object creation
    *              Origin          - Starting point for this walk
    *              MethodDesc      - Method object
    *              Thread          - Current thread state
    *
    * RETURN:      Pointer to the new walk state.
    *
    * DESCRIPTION: Allocate and initialize a new walk state. The current walk
    *              state is set to this new state.
    *
    ******************************************************************************/
   
   ACPI_WALK_STATE *
   AcpiDsCreateWalkState (
       ACPI_OWNER_ID           OwnerId,
       ACPI_PARSE_OBJECT       *Origin,
       ACPI_OPERAND_OBJECT     *MethodDesc,
       ACPI_THREAD_STATE       *Thread)
   {
       ACPI_WALK_STATE         *WalkState;
   
   
       ACPI_FUNCTION_TRACE (DsCreateWalkState);
   
   
       WalkState = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_WALK_STATE));
       if (!WalkState)
       {
           return_PTR (NULL);
       }
   
       WalkState->DescriptorType = ACPI_DESC_TYPE_WALK;
       WalkState->MethodDesc = MethodDesc;
       WalkState->OwnerId = OwnerId;
       WalkState->Origin = Origin;
       WalkState->Thread = Thread;
   
       WalkState->ParserState.StartOp = Origin;
   
       /* Init the method args/local */
   
   #ifndef ACPI_CONSTANT_EVAL_ONLY
       AcpiDsMethodDataInit (WalkState);
   #endif
   
       /* Put the new state at the head of the walk list */
   
       if (Thread)
       {
           AcpiDsPushWalkState (WalkState, Thread);
       }
   
       return_PTR (WalkState);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsInitAmlWalk
    *
    * PARAMETERS:  WalkState       - New state to be initialized
    *              Op              - Current parse op
    *              MethodNode      - Control method NS node, if any
    *              AmlStart        - Start of AML
    *              AmlLength       - Length of AML
    *              Info            - Method info block (params, etc.)
    *              PassNumber      - 1, 2, or 3
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsInitAmlWalk (
       ACPI_WALK_STATE         *WalkState,
       ACPI_PARSE_OBJECT       *Op,
       ACPI_NAMESPACE_NODE     *MethodNode,
       UINT8                   *AmlStart,
       UINT32                  AmlLength,
       ACPI_EVALUATE_INFO      *Info,
       UINT8                   PassNumber)
   {
       ACPI_STATUS             Status;
       ACPI_PARSE_STATE        *ParserState = &WalkState->ParserState;
       ACPI_PARSE_OBJECT       *ExtraOp;
   
   
       ACPI_FUNCTION_TRACE (DsInitAmlWalk);
   
   
       WalkState->ParserState.Aml =
       WalkState->ParserState.AmlStart = AmlStart;
       WalkState->ParserState.AmlEnd =
       WalkState->ParserState.PkgEnd = AmlStart + AmlLength;
   
       /* The NextOp of the NextWalk will be the beginning of the method */
   
       WalkState->NextOp = NULL;
       WalkState->PassNumber = PassNumber;
   
       if (Info)
       {
           WalkState->Params = Info->Parameters;
           WalkState->CallerReturnDesc = &Info->ReturnObject;
       }
   
       Status = AcpiPsInitScope (&WalkState->ParserState, Op);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       if (MethodNode)
       {
           WalkState->ParserState.StartNode = MethodNode;
           WalkState->WalkType = ACPI_WALK_METHOD;
           WalkState->MethodNode = MethodNode;
           WalkState->MethodDesc = AcpiNsGetAttachedObject (MethodNode);
   
           /* Push start scope on scope stack and make it current  */
   
           Status = AcpiDsScopeStackPush (
               MethodNode, ACPI_TYPE_METHOD, WalkState);
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
   
           /* Init the method arguments */
   
           Status = AcpiDsMethodDataInitArgs (WalkState->Params,
                       ACPI_METHOD_NUM_ARGS, WalkState);
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
       }
       else
       {
           /*
            * Setup the current scope.
            * Find a Named Op that has a namespace node associated with it.
            * search upwards from this Op. Current scope is the first
            * Op with a namespace node.
            */
           ExtraOp = ParserState->StartOp;
           while (ExtraOp && !ExtraOp->Common.Node)
           {
               ExtraOp = ExtraOp->Common.Parent;
           }
   
           if (!ExtraOp)
           {
               ParserState->StartNode = NULL;
           }
           else
           {
               ParserState->StartNode = ExtraOp->Common.Node;
           }
   
           if (ParserState->StartNode)
           {
               /* Push start scope on scope stack and make it current  */
   
               Status = AcpiDsScopeStackPush (ParserState->StartNode,
                   ParserState->StartNode->Type, WalkState);
               if (ACPI_FAILURE (Status))
               {
                   return_ACPI_STATUS (Status);
               }
           }
       }
   
       Status = AcpiDsInitCallbacks (WalkState, PassNumber);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsDeleteWalkState
    *
    * PARAMETERS:  WalkState       - State to delete
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Delete a walk state including all internal data structures
    *
    ******************************************************************************/
   
   void
   AcpiDsDeleteWalkState (
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_GENERIC_STATE      *State;
   
   
       ACPI_FUNCTION_TRACE_PTR (DsDeleteWalkState, WalkState);
   
   
       if (!WalkState)
       {
           return_VOID;
       }
   
       if (WalkState->DescriptorType != ACPI_DESC_TYPE_WALK)
       {
           ACPI_ERROR ((AE_INFO, "%p is not a valid walk state",
               WalkState));
           return_VOID;
       }
   
       /* There should not be any open scopes */
   
       if (WalkState->ParserState.Scope)
       {
           ACPI_ERROR ((AE_INFO, "%p walk still has a scope list",
               WalkState));
           AcpiPsCleanupScope (&WalkState->ParserState);
       }
   
       /* Always must free any linked control states */
   
       while (WalkState->ControlState)
       {
           State = WalkState->ControlState;
           WalkState->ControlState = State->Common.Next;
   
           AcpiUtDeleteGenericState (State);
       }
   
       /* Always must free any linked parse states */
   
       while (WalkState->ScopeInfo)
       {
           State = WalkState->ScopeInfo;
           WalkState->ScopeInfo = State->Common.Next;
   
           AcpiUtDeleteGenericState (State);
       }
   
       /* Always must free any stacked result states */
   
       while (WalkState->Results)
       {
           State = WalkState->Results;
           WalkState->Results = State->Common.Next;
   
           AcpiUtDeleteGenericState (State);
       }
   
       ACPI_FREE (WalkState);
       return_VOID;
   }

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