C++ AcpiDsCreateWalkState函数代码示例

ACPI_STATUS
XfCrossReferenceNamespace (
    void)
{
    ACPI_WALK_STATE         *WalkState;


    /*
     * Create a new walk state for use when looking up names
     * within the namespace (Passed as context to the callbacks)
     */
    WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
    if (!WalkState)
    {
        return (AE_NO_MEMORY);
    }

    /* Walk the entire parse tree */

    TrWalkParseTree (AslGbl_ParseTreeRoot, ASL_WALK_VISIT_TWICE,
        XfNamespaceLocateBegin, XfNamespaceLocateEnd, WalkState);

    ACPI_FREE (WalkState);
    return (AE_OK);
}

ACPI_STATUS
LkCrossReferenceNamespace (
    void)
{
    ACPI_WALK_STATE         *WalkState;


    DbgPrint (ASL_DEBUG_OUTPUT, "\nCross referencing namespace\n\n");

    /*
     * Create a new walk state for use when looking up names
     * within the namespace (Passed as context to the callbacks)
     */
    WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
    if (!WalkState)
    {
        return (AE_NO_MEMORY);
    }

    /* Walk the entire parse tree */

    TrWalkParseTree (RootNode, ASL_WALK_VISIT_TWICE, LkNamespaceLocateBegin,
                        LkNamespaceLocateEnd, WalkState);
    return (AE_OK);
}

ACPI_STATUS
LdLoadNamespace (
    ACPI_PARSE_OBJECT       *RootOp)
{
    ACPI_WALK_STATE         *WalkState;


    DbgPrint (ASL_DEBUG_OUTPUT, "\nCreating namespace\n\n");

    /* Create a new walk state */

    WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
    if (!WalkState)
    {
        return (AE_NO_MEMORY);
    }

    /* Walk the entire parse tree, first pass */

    TrWalkParseTree (RootOp, ASL_WALK_VISIT_TWICE, LdNamespace1Begin,
        LdCommonNamespaceEnd, WalkState);

    /* Second pass to handle forward references */

    TrWalkParseTree (RootOp, ASL_WALK_VISIT_TWICE, LdNamespace2Begin,
        LdCommonNamespaceEnd, WalkState);

    /* Dump the namespace if debug is enabled */

    AcpiNsDumpTables (ACPI_NS_ALL, ACPI_UINT32_MAX);
    return (AE_OK);
}

ACPI_STATUS
AcpiDsAutoSerializeMethod (
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_OPERAND_OBJECT     *ObjDesc)
{
    ACPI_STATUS             Status;
    ACPI_PARSE_OBJECT       *Op = NULL;
    ACPI_WALK_STATE         *WalkState;


    ACPI_FUNCTION_TRACE_PTR (DsAutoSerializeMethod, Node);


    ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
        "Method auto-serialization parse [%4.4s] %p\n",
        AcpiUtGetNodeName (Node), Node));

    /* Create/Init a root op for the method parse tree */

    Op = AcpiPsAllocOp (AML_METHOD_OP);
    if (!Op)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    AcpiPsSetName (Op, Node->Name.Integer);
    Op->Common.Node = Node;

    /* Create and initialize a new walk state */

    WalkState = AcpiDsCreateWalkState (Node->OwnerId, NULL, NULL, NULL);
    if (!WalkState)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    Status = AcpiDsInitAmlWalk (WalkState, Op, Node, ObjDesc->Method.AmlStart,
                ObjDesc->Method.AmlLength, NULL, 0);
    if (ACPI_FAILURE (Status))
    {
        AcpiDsDeleteWalkState (WalkState);
        return_ACPI_STATUS (Status);
    }

    WalkState->DescendingCallback = AcpiDsDetectNamedOpcodes;

    /* Parse the method, scan for creation of named objects */

    Status = AcpiPsParseAml (WalkState);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    AcpiPsDeleteParseTree (Op);
    return_ACPI_STATUS (Status);
}

ACPI_STATUS
AcpiDbDisassembleMethod (
    char                    *Name)
{
    ACPI_STATUS             Status;
    ACPI_PARSE_OBJECT       *Op;
    ACPI_WALK_STATE         *WalkState;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_NAMESPACE_NODE     *Method;


    Method = AcpiDbConvertToNode (Name);
    if (!Method)
    {
        return (AE_BAD_PARAMETER);
    }

    ObjDesc = Method->Object;

    Op = AcpiPsCreateScopeOp ();
    if (!Op)
    {
        return (AE_NO_MEMORY);
    }

    /* Create and initialize a new walk state */

    WalkState = AcpiDsCreateWalkState (0, Op, NULL, NULL);
    if (!WalkState)
    {
        return (AE_NO_MEMORY);
    }

    Status = AcpiDsInitAmlWalk (WalkState, Op, NULL,
                    ObjDesc->Method.AmlStart,
                    ObjDesc->Method.AmlLength, NULL, ACPI_IMODE_LOAD_PASS1);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /* Parse the AML */

    WalkState->ParseFlags &= ~ACPI_PARSE_DELETE_TREE;
    WalkState->ParseFlags |= ACPI_PARSE_DISASSEMBLE;
    Status = AcpiPsParseAml (WalkState);

    AcpiDmDisassemble (NULL, Op, 0);
    AcpiPsDeleteParseTree (Op);
    return (AE_OK);
}

ACPI_STATUS
AcpiNsOneCompleteParse (
    UINT32                  PassNumber,
    ACPI_TABLE_DESC         *TableDesc)
{
    ACPI_PARSE_OBJECT       *ParseRoot;
    ACPI_STATUS             Status;
    ACPI_WALK_STATE         *WalkState;


    ACPI_FUNCTION_TRACE ("NsOneCompleteParse");


    /* Create and init a Root Node */

    ParseRoot = AcpiPsCreateScopeOp ();
    if (!ParseRoot)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }


    /* Create and initialize a new walk state */

    WalkState = AcpiDsCreateWalkState (TABLE_ID_DSDT,
                                    NULL, NULL, NULL);
    if (!WalkState)
    {
        AcpiPsFreeOp (ParseRoot);
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    Status = AcpiDsInitAmlWalk (WalkState, ParseRoot, NULL, TableDesc->AmlStart,
                    TableDesc->AmlLength, NULL, NULL, PassNumber);
    if (ACPI_FAILURE (Status))
    {
        AcpiDsDeleteWalkState (WalkState);
        return_ACPI_STATUS (Status);
    }

    /* Parse the AML */

    ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "*PARSE* pass %d parse\n", PassNumber));
    Status = AcpiPsParseAml (WalkState);

    AcpiPsDeleteParseTree (ParseRoot);
    return_ACPI_STATUS (Status);
}

void
AeDoObjectOverrides (
    void)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_WALK_STATE         *WalkState;
    int                     i;


    if (!InitFile)
    {
        return;
    }

    /* Create needed objects to be reused for each init entry */

    ObjDesc = AcpiUtCreateIntegerObject (0);
    WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
    NameBuffer[0] = '\\';

    /* Read the entire file line-by-line */

    while (fgets (LineBuffer, AE_FILE_BUFFER_SIZE, InitFile) != NULL)
    {
        if (sscanf (LineBuffer, "%s %s\n",
                &NameBuffer[1], ValueBuffer) != 2)
        {
            goto CleanupAndExit;
        }

        /* Add a root prefix if not present in the string */

        i = 0;
        if (NameBuffer[1] == '\\')
        {
            i = 1;
        }

        AeDoOneOverride (&NameBuffer[i], ValueBuffer, ObjDesc, WalkState);
    }

    /* Cleanup */

CleanupAndExit:
    fclose (InitFile);
    AcpiDsDeleteWalkState (WalkState);
    AcpiUtRemoveReference (ObjDesc);
}

void
AcpiDmConvertResourceIndexes (
    ACPI_PARSE_OBJECT       *ParseTreeRoot,
    ACPI_NAMESPACE_NODE     *NamespaceRoot)
{
    ACPI_STATUS             Status;
    ACPI_OP_WALK_INFO       Info;
    ACPI_WALK_STATE         *WalkState;


    if (!ParseTreeRoot)
    {
        return;
    }

    /* Create and initialize a new walk state */

    WalkState = AcpiDsCreateWalkState (0, ParseTreeRoot, NULL, NULL);
    if (!WalkState)
    {
        return;
    }

    Status = AcpiDsScopeStackPush (NamespaceRoot, NamespaceRoot->Type, WalkState);
    if (ACPI_FAILURE (Status))
    {
        return;
    }

    Info.Flags = 0;
    Info.Level = 0;
    Info.WalkState = WalkState;
    AcpiDmWalkParseTree (ParseTreeRoot, AcpiDmResourceDescendingOp,
        AcpiDmCommonAscendingOp, &Info);
    ACPI_FREE (WalkState);
    return;
}

void
AcpiDmCrossReferenceNamespace (
    ACPI_PARSE_OBJECT       *ParseTreeRoot,
    ACPI_NAMESPACE_NODE     *NamespaceRoot,
    ACPI_OWNER_ID           OwnerId)
{
    ACPI_STATUS             Status;
    ACPI_OP_WALK_INFO       Info;
    ACPI_WALK_STATE         *WalkState;


    if (!ParseTreeRoot)
    {
        return;
    }

    /* Create and initialize a new walk state */

    WalkState = AcpiDsCreateWalkState (OwnerId, ParseTreeRoot, NULL, NULL);
    if (!WalkState)
    {
        return;
    }

    Status = AcpiDsScopeStackPush (NamespaceRoot, NamespaceRoot->Type, WalkState);
    if (ACPI_FAILURE (Status))
    {
        return;
    }

    Info.Flags = 0;
    Info.Level = 0;
    Info.WalkState = WalkState;
    AcpiDmWalkParseTree (ParseTreeRoot, AcpiDmXrefDescendingOp,
        AcpiDmCommonAscendingOp, &Info);
    ACPI_FREE (WalkState);
}

ACPI_STATUS
AcpiDsCallControlMethod (
    ACPI_THREAD_STATE       *Thread,
    ACPI_WALK_STATE         *ThisWalkState,
    ACPI_PARSE_OBJECT       *Op)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *MethodNode;
    ACPI_WALK_STATE         *NextWalkState = NULL;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_EVALUATE_INFO      *Info;
    UINT32                  i;


    ACPI_FUNCTION_TRACE_PTR (DsCallControlMethod, ThisWalkState);

    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Calling method %p, currentstate=%p\n",
        ThisWalkState->PrevOp, ThisWalkState));

    /*
     * Get the namespace entry for the control method we are about to call
     */
    MethodNode = ThisWalkState->MethodCallNode;
    if (!MethodNode)
    {
        return_ACPI_STATUS (AE_NULL_ENTRY);
    }

    ObjDesc = AcpiNsGetAttachedObject (MethodNode);
    if (!ObjDesc)
    {
        return_ACPI_STATUS (AE_NULL_OBJECT);
    }

    /* Init for new method, possibly wait on method mutex */

    Status = AcpiDsBeginMethodExecution (MethodNode, ObjDesc,
                ThisWalkState);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Begin method parse/execution. Create a new walk state */

    NextWalkState = AcpiDsCreateWalkState (ObjDesc->Method.OwnerId,
                        NULL, ObjDesc, Thread);
    if (!NextWalkState)
    {
        Status = AE_NO_MEMORY;
        goto Cleanup;
    }

    /*
     * The resolved arguments were put on the previous walk state's operand
     * stack. Operands on the previous walk state stack always
     * start at index 0. Also, null terminate the list of arguments
     */
    ThisWalkState->Operands [ThisWalkState->NumOperands] = NULL;

    /*
     * Allocate and initialize the evaluation information block
     * TBD: this is somewhat inefficient, should change interface to
     * DsInitAmlWalk. For now, keeps this struct off the CPU stack
     */
    Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
    if (!Info)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    Info->Parameters = &ThisWalkState->Operands[0];

    Status = AcpiDsInitAmlWalk (NextWalkState, NULL, MethodNode,
                ObjDesc->Method.AmlStart, ObjDesc->Method.AmlLength,
                Info, ACPI_IMODE_EXECUTE);

    ACPI_FREE (Info);
    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    /*
     * Delete the operands on the previous walkstate operand stack
     * (they were copied to new objects)
     */
    for (i = 0; i < ObjDesc->Method.ParamCount; i++)
    {
        AcpiUtRemoveReference (ThisWalkState->Operands [i]);
        ThisWalkState->Operands [i] = NULL;
    }

    /* Clear the operand stack */

    ThisWalkState->NumOperands = 0;

    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
        "**** Begin nested execution of [%4.4s] **** WalkState=%p\n",
        MethodNode->Name.Ascii, NextWalkState));
//.........这里部分代码省略.........

ACPI_STATUS
AcpiDbSecondPassParse (
    ACPI_PARSE_OBJECT       *Root)
{
    ACPI_PARSE_OBJECT       *Op = Root;
    ACPI_PARSE_OBJECT       *Method;
    ACPI_PARSE_OBJECT       *SearchOp;
    ACPI_PARSE_OBJECT       *StartOp;
    ACPI_STATUS             Status = AE_OK;
    UINT32                  BaseAmlOffset;
    ACPI_WALK_STATE         *WalkState;


    ACPI_FUNCTION_ENTRY ();


    AcpiOsPrintf ("Pass two parse ....\n");

    while (Op)
    {
        if (Op->Common.AmlOpcode == AML_METHOD_OP)
        {
            Method = Op;

            /* Create a new walk state for the parse */

            WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
            if (!WalkState)
            {
                return (AE_NO_MEMORY);
            }

            /* Init the Walk State */

            WalkState->ParserState.Aml          =
            WalkState->ParserState.AmlStart     = Method->Named.Data;
            WalkState->ParserState.AmlEnd       =
            WalkState->ParserState.PkgEnd       = Method->Named.Data +
                                                  Method->Named.Length;
            WalkState->ParserState.StartScope   = Op;

            WalkState->DescendingCallback       = AcpiDsLoad1BeginOp;
            WalkState->AscendingCallback        = AcpiDsLoad1EndOp;

            /* Perform the AML parse */

            Status = AcpiPsParseAml (WalkState);

            BaseAmlOffset = (Method->Common.Value.Arg)->Common.AmlOffset + 1;
            StartOp = (Method->Common.Value.Arg)->Common.Next;
            SearchOp = StartOp;

            while (SearchOp)
            {
                SearchOp->Common.AmlOffset += BaseAmlOffset;
                SearchOp = AcpiPsGetDepthNext (StartOp, SearchOp);
            }
        }

        if (Op->Common.AmlOpcode == AML_REGION_OP)
        {
            /* TBD: [Investigate] this isn't quite the right thing to do! */
            /*
             *
             * Method = (ACPI_DEFERRED_OP *) Op;
             * Status = AcpiPsParseAml (Op, Method->Body, Method->BodyLength);
             */
        }

        if (ACPI_FAILURE (Status))
        {
            break;
        }

        Op = AcpiPsGetDepthNext (Root, Op);
    }

    return (Status);
}

static ACPI_STATUS
AcpiDmDeferredParse (
    ACPI_PARSE_OBJECT       *Op,
    UINT8                   *Aml,
    UINT32                  AmlLength)
{
    ACPI_WALK_STATE         *WalkState;
    ACPI_STATUS             Status;
    ACPI_PARSE_OBJECT       *SearchOp;
    ACPI_PARSE_OBJECT       *StartOp;
    UINT32                  BaseAmlOffset;
    ACPI_PARSE_OBJECT       *NewRootOp;
    ACPI_PARSE_OBJECT       *ExtraOp;


    ACPI_FUNCTION_TRACE (DmDeferredParse);


    if (!Aml || !AmlLength)
    {
        return_ACPI_STATUS (AE_OK);
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Parsing deferred opcode %s [%4.4s]\n",
        Op->Common.AmlOpName, (char *) &Op->Named.Name));

    /* Need a new walk state to parse the AML */

    WalkState = AcpiDsCreateWalkState (0, Op, NULL, NULL);
    if (!WalkState)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    Status = AcpiDsInitAmlWalk (WalkState, Op, NULL, Aml,
        AmlLength, NULL, ACPI_IMODE_LOAD_PASS1);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Parse the AML for this deferred opcode */

    WalkState->ParseFlags &= ~ACPI_PARSE_DELETE_TREE;
    WalkState->ParseFlags |= ACPI_PARSE_DISASSEMBLE;
    Status = AcpiPsParseAml (WalkState);

    /*
     * We need to update all of the AML offsets, since the parser thought
     * that the method began at offset zero. In reality, it began somewhere
     * within the ACPI table, at the BaseAmlOffset. Walk the entire tree that
     * was just created and update the AmlOffset in each Op.
     */
    BaseAmlOffset = (Op->Common.Value.Arg)->Common.AmlOffset + 1;
    StartOp = (Op->Common.Value.Arg)->Common.Next;
    SearchOp = StartOp;

    while (SearchOp)
    {
        SearchOp->Common.AmlOffset += BaseAmlOffset;
        SearchOp = AcpiPsGetDepthNext (StartOp, SearchOp);
    }

    /*
     * For Buffer and Package opcodes, link the newly parsed subtree
     * into the main parse tree
     */
    switch (Op->Common.AmlOpcode)
    {
    case AML_BUFFER_OP:
    case AML_PACKAGE_OP:
    case AML_VAR_PACKAGE_OP:

        switch (Op->Common.AmlOpcode)
        {
        case AML_PACKAGE_OP:

            ExtraOp = Op->Common.Value.Arg;
            NewRootOp = ExtraOp->Common.Next;
            ACPI_FREE (ExtraOp);
            break;

        case AML_VAR_PACKAGE_OP:
        case AML_BUFFER_OP:
        default:

            NewRootOp = Op->Common.Value.Arg;
            break;
        }

        Op->Common.Value.Arg = NewRootOp->Common.Value.Arg;

        /* Must point all parents to the main tree */

        StartOp = Op;
        SearchOp = StartOp;
        while (SearchOp)
        {
            if (SearchOp->Common.Parent == NewRootOp)
            {
//.........这里部分代码省略.........

static ACPI_STATUS
AcpiDsExecuteArguments (
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_NAMESPACE_NODE     *ScopeNode,
    UINT32                  AmlLength,
    UINT8                   *AmlStart)
{
    ACPI_STATUS             Status;
    ACPI_PARSE_OBJECT       *Op;
    ACPI_WALK_STATE         *WalkState;


    ACPI_FUNCTION_TRACE (DsExecuteArguments);


    /*
     * Allocate a new parser op to be the root of the parsed tree
     */
    Op = AcpiPsAllocOp (AML_INT_EVAL_SUBTREE_OP);
    if (!Op)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /* Save the Node for use in AcpiPsParseAml */

    Op->Common.Node = ScopeNode;

    /* Create and initialize a new parser state */

    WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
    if (!WalkState)
    {
        Status = AE_NO_MEMORY;
        goto Cleanup;
    }

    Status = AcpiDsInitAmlWalk (WalkState, Op, NULL, AmlStart,
                    AmlLength, NULL, ACPI_IMODE_LOAD_PASS1);
    if (ACPI_FAILURE (Status))
    {
        AcpiDsDeleteWalkState (WalkState);
        goto Cleanup;
    }

    /* Mark this parse as a deferred opcode */

    WalkState->ParseFlags = ACPI_PARSE_DEFERRED_OP;
    WalkState->DeferredNode = Node;

    /* Pass1: Parse the entire declaration */

    Status = AcpiPsParseAml (WalkState);
    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    /* Get and init the Op created above */

    Op->Common.Node = Node;
    AcpiPsDeleteParseTree (Op);

    /* Evaluate the deferred arguments */

    Op = AcpiPsAllocOp (AML_INT_EVAL_SUBTREE_OP);
    if (!Op)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    Op->Common.Node = ScopeNode;

    /* Create and initialize a new parser state */

    WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
    if (!WalkState)
    {
        Status = AE_NO_MEMORY;
        goto Cleanup;
    }

    /* Execute the opcode and arguments */

    Status = AcpiDsInitAmlWalk (WalkState, Op, NULL, AmlStart,
                    AmlLength, NULL, ACPI_IMODE_EXECUTE);
    if (ACPI_FAILURE (Status))
    {
        AcpiDsDeleteWalkState (WalkState);
        goto Cleanup;
    }

    /* Mark this execution as a deferred opcode */

    WalkState->DeferredNode = Node;
    Status = AcpiPsParseAml (WalkState);

Cleanup:
    AcpiPsDeleteParseTree (Op);
    return_ACPI_STATUS (Status);
//.........这里部分代码省略.........

ACPI_STATUS
OpcAmlConstantWalk (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{
    ACPI_WALK_STATE         *WalkState;
    ACPI_STATUS             Status = AE_OK;


    if (Op->Asl.CompileFlags == 0)
    {
        return (AE_OK);
    }

    /*
     * Only interested in subtrees that could possibly contain
     * expressions that can be evaluated at this time
     */
    if ((!(Op->Asl.CompileFlags & NODE_COMPILE_TIME_CONST)) ||
          (Op->Asl.CompileFlags & NODE_IS_TARGET))
    {
        return (AE_OK);
    }

    /* Create a new walk state */

    WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
    if (!WalkState)
    {
        return (AE_NO_MEMORY);
    }

    WalkState->NextOp = NULL;
    WalkState->Params = NULL;

    /*
     * Examine the entire subtree -- all nodes must be constants
     * or type 3/4/5 opcodes
     */
    Status = TrWalkParseTree (Op, ASL_WALK_VISIT_DOWNWARD,
        OpcAmlCheckForConstant, NULL, WalkState);

    /*
     * Did we find an entire subtree that contains all constants
     * and type 3/4/5 opcodes?
     */
    switch (Status)
    {
    case AE_OK:

        /* Simple case, like Add(3,4) -> 7 */

        Status = TrSimpleConstantReduction (Op, WalkState);
        break;

    case AE_CTRL_RETURN_VALUE:

        /* More complex case, like Add(3,4,Local0) -> Store(7,Local0) */

        Status = TrTransformToStoreOp (Op, WalkState);
        break;

    case AE_TYPE:

        AcpiDsDeleteWalkState (WalkState);
        return (AE_OK);

    default:
        AcpiDsDeleteWalkState (WalkState);
        break;
    }

    if (ACPI_FAILURE (Status))
    {
        DbgPrint (ASL_PARSE_OUTPUT, "Cannot resolve, %s\n",
            AcpiFormatException (Status));

        /* We could not resolve the subtree for some reason */

        AslError (ASL_ERROR, ASL_MSG_CONSTANT_EVALUATION, Op,
            (char *) AcpiFormatException (Status));

        /* Set the subtree value to ZERO anyway. Eliminates further errors */

        OpcUpdateIntegerNode (Op, 0);
    }

    return (AE_OK);
}

ACPI_STATUS
AcpiNsOneCompleteParse (
    UINT32                  PassNumber,
    UINT32                  TableIndex,
    ACPI_NAMESPACE_NODE     *StartNode)
{
    ACPI_PARSE_OBJECT       *ParseRoot;
    ACPI_STATUS             Status;
    UINT32                  AmlLength;
    UINT8                   *AmlStart;
    ACPI_WALK_STATE         *WalkState;
    ACPI_TABLE_HEADER       *Table;
    ACPI_OWNER_ID           OwnerId;


    ACPI_FUNCTION_TRACE (NsOneCompleteParse);


    Status = AcpiGetTableByIndex (TableIndex, &Table);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Table must consist of at least a complete header */

    if (Table->Length < sizeof (ACPI_TABLE_HEADER))
    {
        return_ACPI_STATUS (AE_BAD_HEADER);
    }

    AmlStart = (UINT8 *) Table + sizeof (ACPI_TABLE_HEADER);
    AmlLength = Table->Length - sizeof (ACPI_TABLE_HEADER);

    Status = AcpiTbGetOwnerId (TableIndex, &OwnerId);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Create and init a Root Node */

    ParseRoot = AcpiPsCreateScopeOp (AmlStart);
    if (!ParseRoot)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /* Create and initialize a new walk state */

    WalkState = AcpiDsCreateWalkState (OwnerId, NULL, NULL, NULL);
    if (!WalkState)
    {
        AcpiPsFreeOp (ParseRoot);
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    Status = AcpiDsInitAmlWalk (WalkState, ParseRoot, NULL,
        AmlStart, AmlLength, NULL, (UINT8) PassNumber);
    if (ACPI_FAILURE (Status))
    {
        AcpiDsDeleteWalkState (WalkState);
        goto Cleanup;
    }

    /* Found OSDT table, enable the namespace override feature */

    if (ACPI_COMPARE_NAME(Table->Signature, ACPI_SIG_OSDT) &&
        PassNumber == ACPI_IMODE_LOAD_PASS1)
    {
        WalkState->NamespaceOverride = TRUE;
    }

    /* StartNode is the default location to load the table  */

    if (StartNode && StartNode != AcpiGbl_RootNode)
    {
        Status = AcpiDsScopeStackPush (
            StartNode, ACPI_TYPE_METHOD, WalkState);
        if (ACPI_FAILURE (Status))
        {
            AcpiDsDeleteWalkState (WalkState);
            goto Cleanup;
        }
    }

    /* Parse the AML */

    ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
        "*PARSE* pass %u parse\n", PassNumber));
    AcpiExEnterInterpreter ();
    Status = AcpiPsParseAml (WalkState);
    AcpiExExitInterpreter ();

Cleanup:
    AcpiPsDeleteParseTree (ParseRoot);
    return_ACPI_STATUS (Status);
}