C++ AcpiNsLookup函数代码示例

static ACPI_STATUS
LdNamespace1Begin (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{
    ACPI_WALK_STATE         *WalkState = (ACPI_WALK_STATE *) Context;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_PARSE_OBJECT       *MethodOp;
    ACPI_STATUS             Status;
    ACPI_OBJECT_TYPE        ObjectType;
    ACPI_OBJECT_TYPE        ActualObjectType = ACPI_TYPE_ANY;
    char                    *Path;
    UINT32                  Flags = ACPI_NS_NO_UPSEARCH;
    ACPI_PARSE_OBJECT       *Arg;
    UINT32                  i;
    BOOLEAN                 ForceNewScope = FALSE;


    ACPI_FUNCTION_NAME (LdNamespace1Begin);
    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op %p [%s]\n",
        Op, Op->Asl.ParseOpName));

    /*
     * We are only interested in opcodes that have an associated name
     * (or multiple names)
     */
    switch (Op->Asl.AmlOpcode)
    {
    case AML_BANK_FIELD_OP:
    case AML_INDEX_FIELD_OP:
    case AML_FIELD_OP:

        Status = LdLoadFieldElements (Op, WalkState);
        return (Status);

    case AML_INT_CONNECTION_OP:


        if (Op->Asl.Child->Asl.AmlOpcode != AML_INT_NAMEPATH_OP)
        {
            break;
        }
        Arg = Op->Asl.Child;

        Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Asl.ExternalName,
            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
            WalkState, &Node);
        if (ACPI_FAILURE (Status))
        {
            break;
        }

        if (Node->Type == ACPI_TYPE_BUFFER)
        {
            Arg->Asl.Node = Node;

            Arg = Node->Op->Asl.Child;  /* Get namepath */
            Arg = Arg->Asl.Next;        /* Get actual buffer */
            Arg = Arg->Asl.Child;       /* Buffer length */
            Arg = Arg->Asl.Next;        /* RAW_DATA buffer */
        }
        break;

    default:

        /* All other opcodes go below */

        break;
    }

    /* Check if this object has already been installed in the namespace */

    if (Op->Asl.Node)
    {
        return (AE_OK);
    }

    Path = Op->Asl.Namepath;
    if (!Path)
    {
        return (AE_OK);
    }

    /* Map the raw opcode into an internal object type */

    switch (Op->Asl.ParseOpcode)
    {
    case PARSEOP_NAME:

        Arg = Op->Asl.Child;  /* Get the NameSeg/NameString node */
        Arg = Arg->Asl.Next;  /* First peer is the object to be associated with the name */

        /*
         * If this name refers to a ResourceTemplate, we will need to open
         * a new scope so that the resource subfield names can be entered into
         * the namespace underneath this name
         */
        if (Op->Asl.CompileFlags & NODE_IS_RESOURCE_DESC)
        {
//.........这里部分代码省略.........

static ACPI_STATUS
LdNamespace2Begin (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{
    ACPI_WALK_STATE         *WalkState = (ACPI_WALK_STATE *) Context;
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_OBJECT_TYPE        ObjectType;
    BOOLEAN                 ForceNewScope = FALSE;
    ACPI_PARSE_OBJECT       *Arg;
    char                    *Path;
    ACPI_NAMESPACE_NODE     *TargetNode;


    ACPI_FUNCTION_NAME (LdNamespace2Begin);
    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op %p [%s]\n",
        Op, Op->Asl.ParseOpName));


    /* Ignore Ops with no namespace node */

    Node = Op->Asl.Node;
    if (!Node)
    {
        return (AE_OK);
    }

    /* Get the type to determine if we should push the scope */

    if ((Op->Asl.ParseOpcode == PARSEOP_DEFAULT_ARG) &&
        (Op->Asl.CompileFlags == NODE_IS_RESOURCE_DESC))
    {
        ObjectType = ACPI_TYPE_LOCAL_RESOURCE;
    }
    else
    {
        ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode);
    }

    /* Push scope for Resource Templates */

    if (Op->Asl.ParseOpcode == PARSEOP_NAME)
    {
        if (Op->Asl.CompileFlags & NODE_IS_RESOURCE_DESC)
        {
            ForceNewScope = TRUE;
        }
    }

    /* Push the scope stack */

    if (ForceNewScope || AcpiNsOpensScope (ObjectType))
    {
        Status = AcpiDsScopeStackPush (Node, ObjectType, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }

    if (Op->Asl.ParseOpcode == PARSEOP_ALIAS)
    {
        /* Complete the alias node by getting and saving the target node */

        /* First child is the alias target */

        Arg = Op->Asl.Child;

        /* Get the target pathname */

        Path = Arg->Asl.Namepath;
        if (!Path)
        {
            Status = UtInternalizeName (Arg->Asl.ExternalName, &Path);
            if (ACPI_FAILURE (Status))
            {
                return (Status);
            }
        }

        /* Get the NS node associated with the target. It must exist. */

        Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ACPI_TYPE_ANY,
            ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
            WalkState, &TargetNode);
        if (ACPI_FAILURE (Status))
        {
            if (Status == AE_NOT_FOUND)
            {
                AslError (ASL_ERROR, ASL_MSG_NOT_FOUND, Op,
                    Op->Asl.ExternalName);

                /*
                 * The name was not found, go ahead and create it.
                 * This prevents more errors later.
                 */
                Status = AcpiNsLookup (WalkState->ScopeInfo, Path,
                    ACPI_TYPE_ANY,
//.........这里部分代码省略.........

ACPI_STATUS
AcpiDsBuildInternalObject (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op,
    ACPI_OPERAND_OBJECT     **ObjDescPtr)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (DsBuildInternalObject);


    *ObjDescPtr = NULL;
    if (Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP)
    {
        /*
         * This is a named object reference. If this name was
         * previously looked up in the namespace, it was stored in
         * this op. Otherwise, go ahead and look it up now
         */
        if (!Op->Common.Node)
        {
            /* Check if we are resolving a named reference within a package */

            if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
                (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP))
            {
                /*
                 * We won't resolve package elements here, we will do this
                 * after all ACPI tables are loaded into the namespace. This
                 * behavior supports both forward references to named objects
                 * and external references to objects in other tables.
                 */
                goto CreateNewObject;
            }
            else
            {
                Status = AcpiNsLookup (WalkState->ScopeInfo,
                    Op->Common.Value.String,
                    ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
                    ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL,
                    ACPI_CAST_INDIRECT_PTR (
                        ACPI_NAMESPACE_NODE, &(Op->Common.Node)));
                if (ACPI_FAILURE (Status))
                {
                    ACPI_ERROR_NAMESPACE (WalkState->ScopeInfo,
                        Op->Common.Value.String, Status);
                    return_ACPI_STATUS (Status);
                }
            }
        }
    }

CreateNewObject:

    /* Create and init a new internal ACPI object */

    ObjDesc = AcpiUtCreateInternalObject (
        (AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode))->ObjectType);
    if (!ObjDesc)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    Status = AcpiDsInitObjectFromOp (
        WalkState, Op, Op->Common.AmlOpcode, &ObjDesc);
    if (ACPI_FAILURE (Status))
    {
        AcpiUtRemoveReference (ObjDesc);
        return_ACPI_STATUS (Status);
    }

    /*
     * Handling for unresolved package reference elements.
     * These are elements that are namepaths.
     */
    if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
        (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP))
    {
        ObjDesc->Reference.Resolved = TRUE;

        if ((Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
            !ObjDesc->Reference.Node)
        {
            /*
             * Name was unresolved above.
             * Get the prefix node for later lookup
             */
            ObjDesc->Reference.Node = WalkState->ScopeInfo->Scope.Node;
            ObjDesc->Reference.Aml = Op->Common.Aml;
            ObjDesc->Reference.Resolved = FALSE;
        }
    }

    *ObjDescPtr = ObjDesc;
    return_ACPI_STATUS (Status);
}

ACPI_STATUS
AcpiNsEvaluateRelative (
    ACPI_NAMESPACE_NODE     *Handle,
    char                    *Pathname,
    ACPI_OPERAND_OBJECT     **Params,
    ACPI_OPERAND_OBJECT     **ReturnObject)
{
    ACPI_NAMESPACE_NODE     *PrefixNode;
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node = NULL;
    char                    *InternalPath = NULL;
    ACPI_GENERIC_STATE      ScopeInfo;


    ACPI_FUNCTION_TRACE ("NsEvaluateRelative");


    /*
     * Must have a valid object handle
     */
    if (!Handle)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Build an internal name string for the method */

    Status = AcpiNsInternalizeName (Pathname, &InternalPath);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Get the prefix handle and Node */

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    PrefixNode = AcpiNsMapHandleToNode (Handle);
    if (!PrefixNode)
    {
        (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
        Status = AE_BAD_PARAMETER;
        goto Cleanup;
    }

    /* Lookup the name in the namespace */

    ScopeInfo.Scope.Node = PrefixNode;
    Status = AcpiNsLookup (&ScopeInfo, InternalPath, ACPI_TYPE_ANY,
                            ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
                            &Node);

    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    if (ACPI_FAILURE (Status))
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Object [%s] not found [%s]\n",
            Pathname, AcpiFormatException (Status)));
        goto Cleanup;
    }

    /*
     * Now that we have a handle to the object, we can attempt
     * to evaluate it.
     */
    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
        Pathname, Node, AcpiNsGetAttachedObject (Node)));

    Status = AcpiNsEvaluateByHandle (Node, Params, ReturnObject);

    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
        Pathname));

Cleanup:

    ACPI_MEM_FREE (InternalPath);
    return_ACPI_STATUS (Status);
}

ACPI_STATUS
AcpiNsGetNodeUnlocked (
    ACPI_NAMESPACE_NODE     *PrefixNode,
    const char              *Pathname,
    UINT32                  Flags,
    ACPI_NAMESPACE_NODE     **ReturnNode)
{
    ACPI_GENERIC_STATE      ScopeInfo;
    ACPI_STATUS             Status;
    char                    *InternalPath;


    ACPI_FUNCTION_TRACE_PTR (NsGetNodeUnlocked, ACPI_CAST_PTR (char, Pathname));


    /* Simplest case is a null pathname */

    if (!Pathname)
    {
        *ReturnNode = PrefixNode;
        if (!PrefixNode)
        {
            *ReturnNode = AcpiGbl_RootNode;
        }

        return_ACPI_STATUS (AE_OK);
    }

    /* Quick check for a reference to the root */

    if (ACPI_IS_ROOT_PREFIX (Pathname[0]) && (!Pathname[1]))
    {
        *ReturnNode = AcpiGbl_RootNode;
        return_ACPI_STATUS (AE_OK);
    }

    /* Convert path to internal representation */

    Status = AcpiNsInternalizeName (Pathname, &InternalPath);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Setup lookup scope (search starting point) */

    ScopeInfo.Scope.Node = PrefixNode;

    /* Lookup the name in the namespace */

    Status = AcpiNsLookup (&ScopeInfo, InternalPath, ACPI_TYPE_ANY,
        ACPI_IMODE_EXECUTE, (Flags | ACPI_NS_DONT_OPEN_SCOPE),
        NULL, ReturnNode);
    if (ACPI_FAILURE (Status))
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s, %s\n",
            Pathname, AcpiFormatException (Status)));
    }

    ACPI_FREE (InternalPath);
    return_ACPI_STATUS (Status);
}

ACPI_STATUS
AcpiDsLoad1BeginOp (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       **OutOp)
{
    ACPI_PARSE_OBJECT       *Op;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;
    ACPI_OBJECT_TYPE        ObjectType;
    char                    *Path;
    UINT32                  Flags;


    ACPI_FUNCTION_TRACE (DsLoad1BeginOp);


    Op = WalkState->Op;
    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p State=%p\n", Op, WalkState));

    /* We are only interested in opcodes that have an associated name */

    if (Op)
    {
        if (!(WalkState->OpInfo->Flags & AML_NAMED))
        {
            *OutOp = Op;
            return_ACPI_STATUS (AE_OK);
        }

        /* Check if this object has already been installed in the namespace */

        if (Op->Common.Node)
        {
            *OutOp = Op;
            return_ACPI_STATUS (AE_OK);
        }
    }

    Path = AcpiPsGetNextNamestring (&WalkState->ParserState);

    /* Map the raw opcode into an internal object type */

    ObjectType = WalkState->OpInfo->ObjectType;

    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
        "State=%p Op=%p [%s]\n", WalkState, Op, AcpiUtGetTypeName (ObjectType)));

    switch (WalkState->Opcode)
    {
    case AML_SCOPE_OP:
        /*
         * The target name of the Scope() operator must exist at this point so
         * that we can actually open the scope to enter new names underneath it.
         * Allow search-to-root for single namesegs.
         */
        Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType,
                        ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT, WalkState, &(Node));
#ifdef ACPI_ASL_COMPILER
        if (Status == AE_NOT_FOUND)
        {
            /*
             * Table disassembly:
             * Target of Scope() not found. Generate an External for it, and
             * insert the name into the namespace.
             */
            AcpiDmAddOpToExternalList (Op, Path, ACPI_TYPE_DEVICE, 0, 0);
            Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType,
                       ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
                       WalkState, &Node);
        }
#endif
        if (ACPI_FAILURE (Status))
        {
            ACPI_ERROR_NAMESPACE (Path, Status);
            return_ACPI_STATUS (Status);
        }

        /*
         * Check to make sure that the target is
         * one of the opcodes that actually opens a scope
         */
        switch (Node->Type)
        {
        case ACPI_TYPE_ANY:
        case ACPI_TYPE_LOCAL_SCOPE:         /* Scope  */
        case ACPI_TYPE_DEVICE:
        case ACPI_TYPE_POWER:
        case ACPI_TYPE_PROCESSOR:
        case ACPI_TYPE_THERMAL:

            /* These are acceptable types */
            break;

        case ACPI_TYPE_INTEGER:
        case ACPI_TYPE_STRING:
        case ACPI_TYPE_BUFFER:
            /*
             * These types we will allow, but we will change the type.
             * This enables some existing code of the form:
             *
//.........这里部分代码省略.........

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_COND_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
//.........这里部分代码省略.........

static ACPI_STATUS
OptOptimizeNameDeclaration (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_WALK_STATE         *WalkState,
    ACPI_NAMESPACE_NODE     *CurrentNode,
    ACPI_NAMESPACE_NODE     *TargetNode,
    char                    *AmlNameString,
    char                    **NewPath)
{
    ACPI_STATUS             Status;
    char                    *NewPathExternal;
    ACPI_NAMESPACE_NODE     *Node;


    ACPI_FUNCTION_TRACE (OptOptimizeNameDeclaration);


    if (((CurrentNode == AcpiGbl_RootNode) ||
        (Op->Common.Parent->Asl.ParseOpcode == PARSEOP_DEFINITION_BLOCK)) &&
            (ACPI_IS_ROOT_PREFIX (AmlNameString[0])))
    {
        /*
         * The current scope is the root, and the namepath has a root prefix
         * that is therefore extraneous. Remove it.
         */
        *NewPath = &AmlNameString[1];

        /* Debug output */

        Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, *NewPath,
            NULL, &NewPathExternal);
        if (ACPI_FAILURE (Status))
        {
            AslCoreSubsystemError (Op, Status, "Externalizing NamePath",
                ASL_NO_ABORT);
            return (Status);
        }

        /*
         * Check to make sure that the optimization finds the node we are
         * looking for. This is simply a sanity check on the new
         * path that has been created.
         *
         * We know that we are at the root, so NULL is used for the scope.
         */
        Status = AcpiNsLookup (NULL, *NewPath,
            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
            ACPI_NS_DONT_OPEN_SCOPE, WalkState, &(Node));
        if (ACPI_SUCCESS (Status))
        {
            /* Found the namepath, but make sure the node is correct */

            if (Node == TargetNode)
            {
                /* The lookup matched the node, accept this optimization */

                AslError (ASL_OPTIMIZATION, ASL_MSG_NAME_OPTIMIZATION,
                    Op, NewPathExternal);

                ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
                    "AT ROOT:   %-24s", NewPathExternal));
            }
            else
            {
                /* Node is not correct, do not use this optimization */

                Status = AE_NOT_FOUND;
                ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
                    " ***** WRONG NODE"));
                AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op,
                    "Not using optimized name - found wrong node");
            }
        }
        else
        {
            /* The lookup failed, we obviously cannot use this optimization */

            ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
                " ***** NOT FOUND"));
            AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op,
                "Not using optimized name - did not find node");
        }

        ACPI_FREE (NewPathExternal);
        return (Status);
    }

    /* Could not optimize */

    return (AE_NOT_FOUND);
}

static ACPI_STATUS
AcpiDmLoadDescendingOp (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{
    ACPI_OP_WALK_INFO       *Info = Context;
    const ACPI_OPCODE_INFO  *OpInfo;
    ACPI_WALK_STATE         *WalkState;
    ACPI_OBJECT_TYPE        ObjectType;
    ACPI_STATUS             Status;
    char                    *Path = NULL;
    ACPI_PARSE_OBJECT       *NextOp;
    ACPI_NAMESPACE_NODE     *Node;
    char                    FieldPath[5];
    BOOLEAN                 PreDefined = FALSE;
    UINT8                   PreDefineIndex = 0;


    WalkState = Info->WalkState;
    OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
    ObjectType = OpInfo->ObjectType;
    ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode);

    /* Only interested in operators that create new names */

    if (!(OpInfo->Flags & AML_NAMED) &&
        !(OpInfo->Flags & AML_CREATE))
    {
        goto Exit;
    }

    /* Get the NamePath from the appropriate place */

    if (OpInfo->Flags & AML_NAMED)
    {
        /* For all named operators, get the new name */

        Path = (char *) Op->Named.Path;

        if (!Path && Op->Common.AmlOpcode == AML_INT_NAMEDFIELD_OP)
        {
            *ACPI_CAST_PTR (UINT32, &FieldPath[0]) = Op->Named.Name;
            FieldPath[4] = 0;
            Path = FieldPath;
        }
    }
    else if (OpInfo->Flags & AML_CREATE)
    {
        /* New name is the last child */

        NextOp = Op->Common.Value.Arg;

        while (NextOp->Common.Next)
        {
            NextOp = NextOp->Common.Next;
        }
        Path = NextOp->Common.Value.String;
    }

    if (!Path)
    {
        goto Exit;
    }

    /* Insert the name into the namespace */

    Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType,
                ACPI_IMODE_LOAD_PASS2, ACPI_NS_DONT_OPEN_SCOPE,
                WalkState, &Node);

    Op->Common.Node = Node;

    if (ACPI_SUCCESS (Status))
    {
        /* Check if it's a predefined node */

        while (AcpiGbl_PreDefinedNames[PreDefineIndex].Name)
        {
            if (!ACPI_STRNCMP (Node->Name.Ascii,
                AcpiGbl_PreDefinedNames[PreDefineIndex].Name, 4))
            {
                PreDefined = TRUE;
                break;
            }

            PreDefineIndex++;
        }

        /*
         * Set node owner id if it satisfies all the following conditions:
         * 1) Not a predefined node, _SB_ etc
         * 2) Not the root node
         * 3) Not a node created by Scope
         */

        if (!PreDefined && Node != AcpiGbl_RootNode &&
            Op->Common.AmlOpcode != AML_SCOPE_OP)
        {
            Node->OwnerId = WalkState->OwnerId;
//.........这里部分代码省略.........

static ACPI_STATUS
AcpiDmXrefDescendingOp (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{
    ACPI_OP_WALK_INFO       *Info = Context;
    const ACPI_OPCODE_INFO  *OpInfo;
    ACPI_WALK_STATE         *WalkState;
    ACPI_OBJECT_TYPE        ObjectType;
    ACPI_OBJECT_TYPE        ObjectType2;
    ACPI_STATUS             Status;
    char                    *Path = NULL;
    ACPI_PARSE_OBJECT       *NextOp;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_OPERAND_OBJECT     *Object;


    WalkState = Info->WalkState;
    OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
    ObjectType = OpInfo->ObjectType;
    ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode);

    if ((!(OpInfo->Flags & AML_NAMED)) &&
        (!(OpInfo->Flags & AML_CREATE)) &&
        (Op->Common.AmlOpcode != AML_INT_NAMEPATH_OP))
    {
        goto Exit;
    }

    /* Get the NamePath from the appropriate place */

    if (OpInfo->Flags & AML_NAMED)
    {
        if ((Op->Common.AmlOpcode == AML_ALIAS_OP) ||
            (Op->Common.AmlOpcode == AML_SCOPE_OP))
        {
            /*
             * Only these two operators refer to an existing name,
             * first argument
             */
            Path = (char *) Op->Named.Path;
        }
    }
    else if (OpInfo->Flags & AML_CREATE)
    {
        /* Referenced Buffer Name is the first child */

        NextOp = Op->Common.Value.Arg;
        if (NextOp->Common.AmlOpcode == AML_INT_NAMEPATH_OP)
        {
            Path = NextOp->Common.Value.String;
        }
    }
    else
    {
        Path = Op->Common.Value.String;
    }

    if (!Path)
    {
        goto Exit;
    }

    /*
     * Lookup the name in the namespace.  Name must exist at this point, or it
     * is an invalid reference.
     *
     * The namespace is also used as a lookup table for references to resource
     * descriptors and the fields within them.
     */
    Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ACPI_TYPE_ANY,
                ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
                WalkState, &Node);
    if (ACPI_FAILURE (Status))
    {
        if (Status == AE_NOT_FOUND)
        {
            AcpiDmAddToExternalList (Path, (UINT8) ObjectType, 0);

            /*
             * We could install this into the namespace, but we catch duplicate
             * externals when they are added to the list.
             */
#if 0
            Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ACPI_TYPE_ANY,
                       ACPI_IMODE_LOAD_PASS1, ACPI_NS_DONT_OPEN_SCOPE,
                       WalkState, &Node);
#endif
        }
    }

    /*
     * Found the node in external table, add it to external list
     * Node->OwnerId == 0 indicates built-in ACPI Names, _OS_ etc
     */
    else if (Node->OwnerId && WalkState->OwnerId != Node->OwnerId)
    {
        ObjectType2 = ObjectType;

//.........这里部分代码省略.........

ACPI_STATUS
AcpiNsConvertToReference (
    ACPI_NAMESPACE_NODE     *Scope,
    ACPI_OPERAND_OBJECT     *OriginalObject,
    ACPI_OPERAND_OBJECT     **ReturnObject)
{
    ACPI_OPERAND_OBJECT     *NewObject = NULL;
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_GENERIC_STATE      ScopeInfo;
    char                    *Name;


    ACPI_FUNCTION_NAME (NsConvertToReference);


    /* Convert path into internal presentation */

    Status = AcpiNsInternalizeName (OriginalObject->String.Pointer, &Name);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Find the namespace node */

    ScopeInfo.Scope.Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Scope);
    Status = AcpiNsLookup (&ScopeInfo, Name,
        ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
        ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL, &Node);
    if (ACPI_FAILURE (Status))
    {
        /* Check if we are resolving a named reference within a package */

        ACPI_ERROR_NAMESPACE (&ScopeInfo,
            OriginalObject->String.Pointer, Status);
        goto ErrorExit;
    }

    /* Create and init a new internal ACPI object */

    NewObject = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
    if (!NewObject)
    {
        Status = AE_NO_MEMORY;
        goto ErrorExit;
    }
    NewObject->Reference.Node = Node;
    NewObject->Reference.Object = Node->Object;
    NewObject->Reference.Class = ACPI_REFCLASS_NAME;

    /*
     * Increase reference of the object if needed (the object is likely a
     * null for device nodes).
     */
    AcpiUtAddReference (Node->Object);

ErrorExit:
    ACPI_FREE (Name);
    *ReturnObject = NewObject;
    return (AE_OK);
}

void
AcpiPsGetNextNamepath (
    ACPI_PARSE_STATE        *ParserState,
    ACPI_PARSE_OBJECT       *Arg,
    UINT32                  *ArgCount,
    BOOLEAN                 MethodCall)
{
    NATIVE_CHAR             *Path;
    ACPI_PARSE_OBJECT       *NameOp;
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *MethodNode = NULL;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_GENERIC_STATE      ScopeInfo;


    FUNCTION_TRACE ("PsGetNextNamepath");


    Path = AcpiPsGetNextNamestring (ParserState);
    if (!Path || !MethodCall)
    {
        /* Null name case, create a null namepath object */

        AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
        Arg->Value.Name = Path;
        return_VOID;
    }


    if (MethodCall)
    {
        /*
         * Lookup the name in the internal namespace
         */
        ScopeInfo.Scope.Node = NULL;
        Node = ParserState->StartNode;
        if (Node)
        {
            ScopeInfo.Scope.Node = Node;
        }

        /*
         * Lookup object.  We don't want to add anything new to the namespace
         * here, however.  So we use MODE_EXECUTE.  Allow searching of the
         * parent tree, but don't open a new scope -- we just want to lookup the
         * object  (MUST BE mode EXECUTE to perform upsearch)
         */
        Status = AcpiNsLookup (&ScopeInfo, Path, ACPI_TYPE_ANY, IMODE_EXECUTE,
                                NS_SEARCH_PARENT | NS_DONT_OPEN_SCOPE, NULL,
                                &Node);
        if (ACPI_SUCCESS (Status))
        {
            if (Node->Type == ACPI_TYPE_METHOD)
            {
                MethodNode = Node;
                ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "method - %p Path=%p\n",
                    MethodNode, Path));

                NameOp = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
                if (NameOp)
                {
                    /* Change arg into a METHOD CALL and attach name to it */

                    AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);

                    NameOp->Value.Name = Path;

                    /* Point METHODCALL/NAME to the METHOD Node */

                    NameOp->Node = MethodNode;
                    AcpiPsAppendArg (Arg, NameOp);

                    if (!(ACPI_OPERAND_OBJECT  *) MethodNode->Object)
                    {
                        return_VOID;
                    }

                    *ArgCount = ((ACPI_OPERAND_OBJECT  *) MethodNode->Object)->Method.ParamCount;
                }

                return_VOID;
            }

            /*
             * Else this is normal named object reference.
             * Just init the NAMEPATH object with the pathname.
             * (See code below)
             */
        }
    }

    /*
     * Either we didn't find the object in the namespace, or the object is
     * something other than a control method.  Just initialize the Op with the
     * pathname.
     */
    AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
    Arg->Value.Name = Path;


//.........这里部分代码省略.........

ACPI_STATUS
AcpiNsEvaluateByName (
    char                    *Pathname,
    ACPI_OPERAND_OBJECT     **Params,
    ACPI_OPERAND_OBJECT     **ReturnObject)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node = NULL;
    char                    *InternalPath = NULL;


    ACPI_FUNCTION_TRACE ("NsEvaluateByName");


    /* Build an internal name string for the method */

    Status = AcpiNsInternalizeName (Pathname, &InternalPath);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Lookup the name in the namespace */

    Status = AcpiNsLookup (NULL, InternalPath, ACPI_TYPE_ANY,
                            ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
                            &Node);

    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    if (ACPI_FAILURE (Status))
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Object at [%s] was not found, status=%.4X\n",
            Pathname, Status));
        goto Cleanup;
    }

    /*
     * Now that we have a handle to the object, we can attempt
     * to evaluate it.
     */
    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
        Pathname, Node, AcpiNsGetAttachedObject (Node)));

    Status = AcpiNsEvaluateByHandle (Node, Params, ReturnObject);

    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
        Pathname));


Cleanup:

    /* Cleanup */

    if (InternalPath)
    {
        ACPI_MEM_FREE (InternalPath);
    }

    return_ACPI_STATUS (Status);
}

static ACPI_STATUS
OptSearchToRoot (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_WALK_STATE         *WalkState,
    ACPI_NAMESPACE_NODE     *CurrentNode,
    ACPI_NAMESPACE_NODE     *TargetNode,
    ACPI_BUFFER             *TargetPath,
    char                    **NewPath)
{
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_GENERIC_STATE      ScopeInfo;
    ACPI_STATUS             Status;
    char                    *Path;


    ACPI_FUNCTION_NAME (OptSearchToRoot);


    /*
     * Check if search-to-root can be utilized. Use the last NameSeg of
     * the NamePath and 1) See if can be found and 2) If found, make
     * sure that it is the same node that we want. If there is another
     * name in the search path before the one we want, the nodes will
     * not match, and we cannot use this optimization.
     */
    Path = &(((char *) TargetPath->Pointer)[
        TargetPath->Length - ACPI_NAME_SIZE]),
    ScopeInfo.Scope.Node = CurrentNode;

    /* Lookup the NameSeg using SEARCH_PARENT (search-to-root) */

    Status = AcpiNsLookup (&ScopeInfo, Path, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
        ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
        WalkState, &(Node));
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /*
     * We found the name, but we must check to make sure that the node
     * matches. Otherwise, there is another identical name in the search
     * path that precludes the use of this optimization.
     */
    if (Node != TargetNode)
    {
        /*
         * This means that another object with the same name was found first,
         * and we cannot use this optimization.
         */
        return (AE_NOT_FOUND);
    }

    /* Found the node, we can use this optimization */

    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS,
        "NAMESEG:   %-24s", Path));

    /* We must allocate a new string for the name (TargetPath gets deleted) */

    *NewPath = UtStringCacheCalloc (ACPI_NAME_SIZE + 1);
    strcpy (*NewPath, Path);

    if (strncmp (*NewPath, "_T_", 3))
    {
        AslError (ASL_OPTIMIZATION, ASL_MSG_SINGLE_NAME_OPTIMIZATION,
            Op, *NewPath);
    }

    return (AE_OK);
}

ACPI_STATUS
AcpiNsRootInitialize (
    void)
{
    ACPI_STATUS                 Status;
    const ACPI_PREDEFINED_NAMES *InitVal = NULL;
    ACPI_NAMESPACE_NODE         *NewNode;
    ACPI_OPERAND_OBJECT         *ObjDesc;
    ACPI_STRING                 Val = NULL;


    ACPI_FUNCTION_TRACE (NsRootInitialize);


    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * The global root ptr is initially NULL, so a non-NULL value indicates
     * that AcpiNsRootInitialize() has already been called; just return.
     */
    if (AcpiGbl_RootNode)
    {
        Status = AE_OK;
        goto UnlockAndExit;
    }

    /*
     * Tell the rest of the subsystem that the root is initialized
     * (This is OK because the namespace is locked)
     */
    AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct;

    /* Enter the pre-defined names in the name table */

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
        "Entering predefined entries into namespace\n"));

    for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++)
    {
        /* _OSI is optional for now, will be permanent later */

        if (!ACPI_STRCMP (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod)
        {
            continue;
        }

        Status = AcpiNsLookup (NULL, __UNCONST(InitVal->Name), InitVal->Type,
                        ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH,
                        NULL, &NewNode);

        if (ACPI_FAILURE (Status) || (!NewNode)) /* Must be on same line for code converter */
        {
            ACPI_EXCEPTION ((AE_INFO, Status,
                "Could not create predefined name %s",
                InitVal->Name));
        }

        /*
         * Name entered successfully. If entry in PreDefinedNames[] specifies
         * an initial value, create the initial value.
         */
        if (InitVal->Val)
        {
            Status = AcpiOsPredefinedOverride (InitVal, &Val);
            if (ACPI_FAILURE (Status))
            {
                ACPI_ERROR ((AE_INFO,
                    "Could not override predefined %s",
                    InitVal->Name));
            }

            if (!Val)
            {
                Val = __UNCONST(InitVal->Val);
            }

            /*
             * Entry requests an initial value, allocate a
             * descriptor for it.
             */
            ObjDesc = AcpiUtCreateInternalObject (InitVal->Type);
            if (!ObjDesc)
            {
                Status = AE_NO_MEMORY;
                goto UnlockAndExit;
            }

            /*
             * Convert value string from table entry to
             * internal representation. Only types actually
             * used for initial values are implemented here.
             */
            switch (InitVal->Type)
            {
            case ACPI_TYPE_METHOD:
                ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val);
//.........这里部分代码省略.........