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

     /*******************************************************************************
      *
      * Module Name: dsutils - Dispatcher utilities
      *
      ******************************************************************************/
     
     /******************************************************************************
      *
      * 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/amlcode.h>
   #include <contrib/dev/acpica/include/acdispat.h>
   #include <contrib/dev/acpica/include/acinterp.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   #include <contrib/dev/acpica/include/acdebug.h>
   
   #define _COMPONENT          ACPI_DISPATCHER
           ACPI_MODULE_NAME    ("dsutils")
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsClearImplicitReturn
    *
    * PARAMETERS:  WalkState           - Current State
    *
    * RETURN:      None.
    *
    * DESCRIPTION: Clear and remove a reference on an implicit return value. Used
    *              to delete "stale" return values (if enabled, the return value
    *              from every operator is saved at least momentarily, in case the
    *              parent method exits.)
    *
    ******************************************************************************/
   
   void
   AcpiDsClearImplicitReturn (
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_FUNCTION_NAME (DsClearImplicitReturn);
   
   
       /*
        * Slack must be enabled for this feature
        */
       if (!AcpiGbl_EnableInterpreterSlack)
       {
           return;
       }
   
       if (WalkState->ImplicitReturnObj)
       {
           /*
            * Delete any "stale" implicit return. However, in
            * complex statements, the implicit return value can be
            * bubbled up several levels.
            */
           ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
               "Removing reference on stale implicit return obj %p\n",
               WalkState->ImplicitReturnObj));
   
           AcpiUtRemoveReference (WalkState->ImplicitReturnObj);
           WalkState->ImplicitReturnObj = NULL;
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsDoImplicitReturn
    *
    * PARAMETERS:  ReturnDesc          - The return value
    *              WalkState           - Current State
    *              AddReference        - True if a reference should be added to the
    *                                    return object
    *
    * RETURN:      TRUE if implicit return enabled, FALSE otherwise
    *
    * DESCRIPTION: Implements the optional "implicit return".  We save the result
    *              of every ASL operator and control method invocation in case the
    *              parent method exit. Before storing a new return value, we
    *              delete the previous return value.
    *
    ******************************************************************************/
   
   BOOLEAN
   AcpiDsDoImplicitReturn (
       ACPI_OPERAND_OBJECT     *ReturnDesc,
       ACPI_WALK_STATE         *WalkState,
       BOOLEAN                 AddReference)
   {
       ACPI_FUNCTION_NAME (DsDoImplicitReturn);
   
   
       /*
        * Slack must be enabled for this feature, and we must
        * have a valid return object
        */
       if ((!AcpiGbl_EnableInterpreterSlack) ||
           (!ReturnDesc))
       {
           return (FALSE);
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
           "Result %p will be implicitly returned; Prev=%p\n",
           ReturnDesc,
           WalkState->ImplicitReturnObj));
   
       /*
        * Delete any "stale" implicit return value first. However, in
        * complex statements, the implicit return value can be
        * bubbled up several levels, so we don't clear the value if it
        * is the same as the ReturnDesc.
        */
       if (WalkState->ImplicitReturnObj)
       {
           if (WalkState->ImplicitReturnObj == ReturnDesc)
           {
               return (TRUE);
           }
           AcpiDsClearImplicitReturn (WalkState);
       }
   
       /* Save the implicit return value, add a reference if requested */
   
       WalkState->ImplicitReturnObj = ReturnDesc;
       if (AddReference)
       {
           AcpiUtAddReference (ReturnDesc);
       }
   
       return (TRUE);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsIsResultUsed
    *
    * PARAMETERS:  Op                  - Current Op
    *              WalkState           - Current State
    *
    * RETURN:      TRUE if result is used, FALSE otherwise
    *
    * DESCRIPTION: Check if a result object will be used by the parent
    *
    ******************************************************************************/
   
   BOOLEAN
   AcpiDsIsResultUsed (
       ACPI_PARSE_OBJECT       *Op,
       ACPI_WALK_STATE         *WalkState)
   {
       const ACPI_OPCODE_INFO  *ParentInfo;
   
       ACPI_FUNCTION_TRACE_PTR (DsIsResultUsed, Op);
   
   
       /* Must have both an Op and a Result Object */
   
       if (!Op)
       {
           ACPI_ERROR ((AE_INFO, "Null Op"));
           return_UINT8 (TRUE);
       }
   
       /*
        * We know that this operator is not a
        * Return() operator (would not come here.) The following code is the
        * optional support for a so-called "implicit return". Some AML code
        * assumes that the last value of the method is "implicitly" returned
        * to the caller. Just save the last result as the return value.
        * NOTE: this is optional because the ASL language does not actually
        * support this behavior.
        */
       (void) AcpiDsDoImplicitReturn (WalkState->ResultObj, WalkState, TRUE);
   
       /*
        * Now determine if the parent will use the result
        *
        * If there is no parent, or the parent is a ScopeOp, we are executing
        * at the method level. An executing method typically has no parent,
        * since each method is parsed separately. A method invoked externally
        * via ExecuteControlMethod has a ScopeOp as the parent.
        */
       if ((!Op->Common.Parent) ||
           (Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP))
       {
           /* No parent, the return value cannot possibly be used */
   
           ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
               "At Method level, result of [%s] not used\n",
               AcpiPsGetOpcodeName (Op->Common.AmlOpcode)));
           return_UINT8 (FALSE);
       }
   
       /* Get info on the parent. The RootOp is AML_SCOPE */
   
       ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode);
       if (ParentInfo->Class == AML_CLASS_UNKNOWN)
       {
           ACPI_ERROR ((AE_INFO,
               "Unknown parent opcode Op=%p", Op));
           return_UINT8 (FALSE);
       }
   
       /*
        * Decide what to do with the result based on the parent. If
        * the parent opcode will not use the result, delete the object.
        * Otherwise leave it as is, it will be deleted when it is used
        * as an operand later.
        */
       switch (ParentInfo->Class)
       {
       case AML_CLASS_CONTROL:
   
           switch (Op->Common.Parent->Common.AmlOpcode)
           {
           case AML_RETURN_OP:
   
               /* Never delete the return value associated with a return opcode */
   
               goto ResultUsed;
   
           case AML_IF_OP:
           case AML_WHILE_OP:
               /*
                * If we are executing the predicate AND this is the predicate op,
                * we will use the return value
                */
               if ((WalkState->ControlState->Common.State ==
                       ACPI_CONTROL_PREDICATE_EXECUTING) &&
                   (WalkState->ControlState->Control.PredicateOp == Op))
               {
                   goto ResultUsed;
               }
               break;
   
           default:
   
               /* Ignore other control opcodes */
   
               break;
           }
   
           /* The general control opcode returns no result */
   
           goto ResultNotUsed;
   
       case AML_CLASS_CREATE:
           /*
            * These opcodes allow TermArg(s) as operands and therefore
            * the operands can be method calls. The result is used.
            */
           goto ResultUsed;
   
       case AML_CLASS_NAMED_OBJECT:
   
           if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP)       ||
               (Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP)  ||
               (Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP)      ||
               (Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP)       ||
               (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP) ||
               (Op->Common.Parent->Common.AmlOpcode == AML_INT_EVAL_SUBTREE_OP) ||
               (Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP))
           {
               /*
                * These opcodes allow TermArg(s) as operands and therefore
                * the operands can be method calls. The result is used.
                */
               goto ResultUsed;
           }
   
           goto ResultNotUsed;
   
       default:
           /*
            * In all other cases. the parent will actually use the return
            * object, so keep it.
            */
           goto ResultUsed;
       }
   
   
   ResultUsed:
       ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
           "Result of [%s] used by Parent [%s] Op=%p\n",
           AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
           AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op));
   
       return_UINT8 (TRUE);
   
   
   ResultNotUsed:
       ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
           "Result of [%s] not used by Parent [%s] Op=%p\n",
           AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
           AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op));
   
       return_UINT8 (FALSE);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsDeleteResultIfNotUsed
    *
    * PARAMETERS:  Op              - Current parse Op
    *              ResultObj       - Result of the operation
    *              WalkState       - Current state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
    *              result descriptor, check if the parent opcode will actually use
    *              this result. If not, delete the result now so that it will
    *              not become orphaned.
    *
    ******************************************************************************/
   
   void
   AcpiDsDeleteResultIfNotUsed (
       ACPI_PARSE_OBJECT       *Op,
       ACPI_OPERAND_OBJECT     *ResultObj,
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed, ResultObj);
   
   
       if (!Op)
       {
           ACPI_ERROR ((AE_INFO, "Null Op"));
           return_VOID;
       }
   
       if (!ResultObj)
       {
           return_VOID;
       }
   
       if (!AcpiDsIsResultUsed (Op, WalkState))
       {
           /* Must pop the result stack (ObjDesc should be equal to ResultObj) */
   
           Status = AcpiDsResultPop (&ObjDesc, WalkState);
           if (ACPI_SUCCESS (Status))
           {
               AcpiUtRemoveReference (ResultObj);
           }
       }
   
       return_VOID;
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsResolveOperands
    *
    * PARAMETERS:  WalkState           - Current walk state with operands on stack
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Resolve all operands to their values. Used to prepare
    *              arguments to a control method invocation (a call from one
    *              method to another.)
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsResolveOperands (
       ACPI_WALK_STATE         *WalkState)
   {
       UINT32                  i;
       ACPI_STATUS             Status = AE_OK;
   
   
       ACPI_FUNCTION_TRACE_PTR (DsResolveOperands, WalkState);
   
   
       /*
        * Attempt to resolve each of the valid operands
        * Method arguments are passed by reference, not by value. This means
        * that the actual objects are passed, not copies of the objects.
        */
       for (i = 0; i < WalkState->NumOperands; i++)
       {
           Status = AcpiExResolveToValue (&WalkState->Operands[i], WalkState);
           if (ACPI_FAILURE (Status))
           {
               break;
           }
       }
   
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsClearOperands
    *
    * PARAMETERS:  WalkState           - Current walk state with operands on stack
    *
    * RETURN:      None
    *
    * DESCRIPTION: Clear all operands on the current walk state operand stack.
    *
    ******************************************************************************/
   
   void
   AcpiDsClearOperands (
       ACPI_WALK_STATE         *WalkState)
   {
       UINT32                  i;
   
   
       ACPI_FUNCTION_TRACE_PTR (DsClearOperands, WalkState);
   
   
       /* Remove a reference on each operand on the stack */
   
       for (i = 0; i < WalkState->NumOperands; i++)
       {
           /*
            * Remove a reference to all operands, including both
            * "Arguments" and "Targets".
            */
           AcpiUtRemoveReference (WalkState->Operands[i]);
           WalkState->Operands[i] = NULL;
       }
   
       WalkState->NumOperands = 0;
       return_VOID;
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsCreateOperand
    *
    * PARAMETERS:  WalkState       - Current walk state
    *              Arg             - Parse object for the argument
    *              ArgIndex        - Which argument (zero based)
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Translate a parse tree object that is an argument to an AML
    *              opcode to the equivalent interpreter object. This may include
    *              looking up a name or entering a new name into the internal
    *              namespace.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsCreateOperand (
       ACPI_WALK_STATE         *WalkState,
       ACPI_PARSE_OBJECT       *Arg,
       UINT32                  ArgIndex)
   {
       ACPI_STATUS             Status = AE_OK;
       char                    *NameString;
       UINT32                  NameLength;
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_PARSE_OBJECT       *ParentOp;
       UINT16                  Opcode;
       ACPI_INTERPRETER_MODE   InterpreterMode;
       const ACPI_OPCODE_INFO  *OpInfo;
   
   
       ACPI_FUNCTION_TRACE_PTR (DsCreateOperand, Arg);
   
   
       /* A valid name must be looked up in the namespace */
   
       if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
           (Arg->Common.Value.String) &&
           !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
       {
           ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", Arg));
   
           /* Get the entire name string from the AML stream */
   
           Status = AcpiExGetNameString (ACPI_TYPE_ANY,
               Arg->Common.Value.Buffer, &NameString, &NameLength);
   
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
   
           /* All prefixes have been handled, and the name is in NameString */
   
           /*
            * Special handling for BufferField declarations. This is a deferred
            * opcode that unfortunately defines the field name as the last
            * parameter instead of the first. We get here when we are performing
            * the deferred execution, so the actual name of the field is already
            * in the namespace. We don't want to attempt to look it up again
            * because we may be executing in a different scope than where the
            * actual opcode exists.
            */
           if ((WalkState->DeferredNode) &&
               (WalkState->DeferredNode->Type == ACPI_TYPE_BUFFER_FIELD) &&
               (ArgIndex == (UINT32)
                   ((WalkState->Opcode == AML_CREATE_FIELD_OP) ? 3 : 2)))
           {
               ObjDesc = ACPI_CAST_PTR (
                   ACPI_OPERAND_OBJECT, WalkState->DeferredNode);
               Status = AE_OK;
           }
           else    /* All other opcodes */
           {
               /*
                * Differentiate between a namespace "create" operation
                * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
                * IMODE_EXECUTE) in order to support the creation of
                * namespace objects during the execution of control methods.
                */
               ParentOp = Arg->Common.Parent;
               OpInfo = AcpiPsGetOpcodeInfo (ParentOp->Common.AmlOpcode);
   
               if ((OpInfo->Flags & AML_NSNODE) &&
                   (ParentOp->Common.AmlOpcode != AML_INT_METHODCALL_OP) &&
                   (ParentOp->Common.AmlOpcode != AML_REGION_OP) &&
                   (ParentOp->Common.AmlOpcode != AML_INT_NAMEPATH_OP))
               {
                   /* Enter name into namespace if not found */
   
                   InterpreterMode = ACPI_IMODE_LOAD_PASS2;
               }
               else
               {
                   /* Return a failure if name not found */
   
                   InterpreterMode = ACPI_IMODE_EXECUTE;
               }
   
               Status = AcpiNsLookup (WalkState->ScopeInfo, NameString,
                   ACPI_TYPE_ANY, InterpreterMode,
                   ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, WalkState,
                   ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ObjDesc));
               /*
                * The only case where we pass through (ignore) a NOT_FOUND
                * error is for the CondRefOf opcode.
                */
               if (Status == AE_NOT_FOUND)
               {
                   if (ParentOp->Common.AmlOpcode == AML_CONDITIONAL_REF_OF_OP)
                   {
                       /*
                        * For the Conditional Reference op, it's OK if
                        * the name is not found;  We just need a way to
                        * indicate this to the interpreter, set the
                        * object to the root
                        */
                       ObjDesc = ACPI_CAST_PTR (
                           ACPI_OPERAND_OBJECT, AcpiGbl_RootNode);
                       Status = AE_OK;
                   }
                   else if (ParentOp->Common.AmlOpcode == AML_EXTERNAL_OP)
                   {
                       /*
                        * This opcode should never appear here. It is used only
                        * by AML disassemblers and is surrounded by an If(0)
                        * by the ASL compiler.
                        *
                        * Therefore, if we see it here, it is a serious error.
                        */
                       Status = AE_AML_BAD_OPCODE;
                   }
                   else
                   {
                       /*
                        * We just plain didn't find it -- which is a
                        * very serious error at this point
                        */
                       Status = AE_AML_NAME_NOT_FOUND;
                   }
               }
   
               if (ACPI_FAILURE (Status))
               {
                   ACPI_ERROR_NAMESPACE (WalkState->ScopeInfo,
                       NameString, Status);
               }
           }
   
           /* Free the namestring created above */
   
           ACPI_FREE (NameString);
   
           /* Check status from the lookup */
   
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
   
           /* Put the resulting object onto the current object stack */
   
           Status = AcpiDsObjStackPush (ObjDesc, WalkState);
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
   
           AcpiDbDisplayArgumentObject (ObjDesc, WalkState);
       }
       else
       {
           /* Check for null name case */
   
           if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
               !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
           {
               /*
                * If the name is null, this means that this is an
                * optional result parameter that was not specified
                * in the original ASL. Create a Zero Constant for a
                * placeholder. (Store to a constant is a Noop.)
                */
               Opcode = AML_ZERO_OP;       /* Has no arguments! */
   
               ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
                   "Null namepath: Arg=%p\n", Arg));
           }
           else
           {
               Opcode = Arg->Common.AmlOpcode;
           }
   
           /* Get the object type of the argument */
   
           OpInfo = AcpiPsGetOpcodeInfo (Opcode);
           if (OpInfo->ObjectType == ACPI_TYPE_INVALID)
           {
               return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
           }
   
           if ((OpInfo->Flags & AML_HAS_RETVAL) ||
               (Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
           {
               /*
                * Use value that was already previously returned
                * by the evaluation of this argument
                */
               Status = AcpiDsResultPop (&ObjDesc, WalkState);
               if (ACPI_FAILURE (Status))
               {
                   /*
                    * Only error is underflow, and this indicates
                    * a missing or null operand!
                    */
                   ACPI_EXCEPTION ((AE_INFO, Status,
                       "Missing or null operand"));
                   return_ACPI_STATUS (Status);
               }
           }
           else
           {
               /* Create an ACPI_INTERNAL_OBJECT for the argument */
   
               ObjDesc = AcpiUtCreateInternalObject (OpInfo->ObjectType);
               if (!ObjDesc)
               {
                   return_ACPI_STATUS (AE_NO_MEMORY);
               }
   
               /* Initialize the new object */
   
               Status = AcpiDsInitObjectFromOp (
                   WalkState, Arg, Opcode, &ObjDesc);
               if (ACPI_FAILURE (Status))
               {
                   AcpiUtDeleteObjectDesc (ObjDesc);
                   return_ACPI_STATUS (Status);
               }
           }
   
           /* Put the operand object on the object stack */
   
           Status = AcpiDsObjStackPush (ObjDesc, WalkState);
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
   
           AcpiDbDisplayArgumentObject (ObjDesc, WalkState);
       }
   
       return_ACPI_STATUS (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsCreateOperands
    *
    * PARAMETERS:  WalkState           - Current state
    *              FirstArg            - First argument of a parser argument tree
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Convert an operator's arguments from a parse tree format to
    *              namespace objects and place those argument object on the object
    *              stack in preparation for evaluation by the interpreter.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsCreateOperands (
       ACPI_WALK_STATE         *WalkState,
       ACPI_PARSE_OBJECT       *FirstArg)
   {
       ACPI_STATUS             Status = AE_OK;
       ACPI_PARSE_OBJECT       *Arg;
       ACPI_PARSE_OBJECT       *Arguments[ACPI_OBJ_NUM_OPERANDS];
       UINT32                  ArgCount = 0;
       UINT32                  Index = WalkState->NumOperands;
       UINT32                  i;
   
   
       ACPI_FUNCTION_TRACE_PTR (DsCreateOperands, FirstArg);
   
   
       /* Get all arguments in the list */
   
       Arg = FirstArg;
       while (Arg)
       {
           if (Index >= ACPI_OBJ_NUM_OPERANDS)
           {
               return_ACPI_STATUS (AE_BAD_DATA);
           }
   
           Arguments[Index] = Arg;
           WalkState->Operands [Index] = NULL;
   
           /* Move on to next argument, if any */
   
           Arg = Arg->Common.Next;
           ArgCount++;
           Index++;
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
           "NumOperands %d, ArgCount %d, Index %d\n",
           WalkState->NumOperands, ArgCount, Index));
   
       /* Create the interpreter arguments, in reverse order */
   
       Index--;
       for (i = 0; i < ArgCount; i++)
       {
           Arg = Arguments[Index];
           WalkState->OperandIndex = (UINT8) Index;
   
           Status = AcpiDsCreateOperand (WalkState, Arg, Index);
           if (ACPI_FAILURE (Status))
           {
               goto Cleanup;
           }
   
           ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
               "Created Arg #%u (%p) %u args total\n",
               Index, Arg, ArgCount));
           Index--;
       }
   
       return_ACPI_STATUS (Status);
   
   
   Cleanup:
       /*
        * We must undo everything done above; meaning that we must
        * pop everything off of the operand stack and delete those
        * objects
        */
       AcpiDsObjStackPopAndDelete (ArgCount, WalkState);
   
       ACPI_EXCEPTION ((AE_INFO, Status, "While creating Arg %u", Index));
       return_ACPI_STATUS (Status);
   }
   
   
   /*****************************************************************************
    *
    * FUNCTION:    AcpiDsEvaluateNamePath
    *
    * PARAMETERS:  WalkState       - Current state of the parse tree walk,
    *                                the opcode of current operation should be
    *                                AML_INT_NAMEPATH_OP
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Translate the -NamePath- parse tree object to the equivalent
    *              interpreter object, convert it to value, if needed, duplicate
    *              it, if needed, and push it onto the current result stack.
    *
    ****************************************************************************/
   
   ACPI_STATUS
   AcpiDsEvaluateNamePath (
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_STATUS             Status = AE_OK;
       ACPI_PARSE_OBJECT       *Op = WalkState->Op;
       ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
       ACPI_OPERAND_OBJECT     *NewObjDesc;
       UINT8                   Type;
   
   
       ACPI_FUNCTION_TRACE_PTR (DsEvaluateNamePath, WalkState);
   
   
       if (!Op->Common.Parent)
       {
           /* This happens after certain exception processing */
   
           goto Exit;
       }
   
       if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
           (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP) ||
           (Op->Common.Parent->Common.AmlOpcode == AML_REF_OF_OP))
       {
           /* TBD: Should we specify this feature as a bit of OpInfo->Flags of these opcodes? */
   
           goto Exit;
       }
   
       Status = AcpiDsCreateOperand (WalkState, Op, 0);
       if (ACPI_FAILURE (Status))
       {
           goto Exit;
       }
   
       if (Op->Common.Flags & ACPI_PARSEOP_TARGET)
       {
           NewObjDesc = *Operand;
           goto PushResult;
       }
   
       Type = (*Operand)->Common.Type;
   
       Status = AcpiExResolveToValue (Operand, WalkState);
       if (ACPI_FAILURE (Status))
       {
           goto Exit;
      }
  
      if (Type == ACPI_TYPE_INTEGER)
      {
          /* It was incremented by AcpiExResolveToValue */
  
          AcpiUtRemoveReference (*Operand);
  
          Status = AcpiUtCopyIobjectToIobject (
              *Operand, &NewObjDesc, WalkState);
          if (ACPI_FAILURE (Status))
          {
              goto Exit;
          }
      }
      else
      {
          /*
           * The object either was anew created or is
           * a Namespace node - don't decrement it.
           */
          NewObjDesc = *Operand;
      }
  
      /* Cleanup for name-path operand */
  
      Status = AcpiDsObjStackPop (1, WalkState);
      if (ACPI_FAILURE (Status))
      {
          WalkState->ResultObj = NewObjDesc;
          goto Exit;
      }
  
  PushResult:
  
      WalkState->ResultObj = NewObjDesc;
  
      Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
      if (ACPI_SUCCESS (Status))
      {
          /* Force to take it from stack */
  
          Op->Common.Flags |= ACPI_PARSEOP_IN_STACK;
      }
  
  Exit:
  
      return_ACPI_STATUS (Status);
  }

Cache object: f43a8e114355a50345afc19f9e3eea12