C++ AcpiNsGetNode函数代码示例

char *
MpGetDdnValue (
    char                    *DeviceName)
{
    ACPI_NAMESPACE_NODE     *DeviceNode;
    ACPI_NAMESPACE_NODE     *DdnNode;
    ACPI_STATUS             Status;


    Status = AcpiNsGetNode (NULL, DeviceName, ACPI_NS_NO_UPSEARCH,
        &DeviceNode);
    if (ACPI_FAILURE (Status))
    {
        goto ErrorExit;
    }

    Status = AcpiNsGetNode (DeviceNode, METHOD_NAME__DDN, ACPI_NS_NO_UPSEARCH,
        &DdnNode);
    if (ACPI_FAILURE (Status))
    {
        goto ErrorExit;
    }

    if ((DdnNode->Type != ACPI_TYPE_STRING) ||
        !DdnNode->Object)
    {
        goto ErrorExit;
    }

    return (DdnNode->Object->String.Pointer);


ErrorExit:
    return (NULL);
}

void
AcpiDbSetScope (
    char                    *Name)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    if (!Name || Name[0] == 0)
    {
        AcpiOsPrintf ("Current scope: %s\n", AcpiGbl_DbScopeBuf);
        return;
    }

    AcpiDbPrepNamestring (Name);

    if (Name[0] == '\\')
    {
        /* Validate new scope from the root */

        Status = AcpiNsGetNode (AcpiGbl_RootNode, Name, ACPI_NS_NO_UPSEARCH,
                    &Node);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        ACPI_STRCPY (AcpiGbl_DbScopeBuf, Name);
        ACPI_STRCAT (AcpiGbl_DbScopeBuf, "\\");
    }
    else
    {
        /* Validate new scope relative to old scope */

        Status = AcpiNsGetNode (AcpiGbl_DbScopeNode, Name, ACPI_NS_NO_UPSEARCH,
                    &Node);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        ACPI_STRCAT (AcpiGbl_DbScopeBuf, Name);
        ACPI_STRCAT (AcpiGbl_DbScopeBuf, "\\");
    }

    AcpiGbl_DbScopeNode = Node;
    AcpiOsPrintf ("New scope: %s\n", AcpiGbl_DbScopeBuf);
    return;

ErrorExit:

    AcpiOsPrintf ("Could not attach scope: %s, %s\n",
        Name, AcpiFormatException (Status));
}

void
AcpiNsReportMethodError (
    const char              *ModuleName,
    UINT32                  LineNumber,
    const char              *Message,
    ACPI_NAMESPACE_NODE     *PrefixNode,
    const char              *Path,
    ACPI_STATUS             MethodStatus)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node = PrefixNode;


    AcpiOsPrintf ("ACPI Error (%s-%04d): ", ModuleName, LineNumber);

    if (Path)
    {
        Status = AcpiNsGetNode (PrefixNode, Path, ACPI_NS_NO_UPSEARCH,
                    &Node);
        if (ACPI_FAILURE (Status))
        {
            AcpiOsPrintf ("[Could not get node by pathname]");
        }
    }

    AcpiNsPrintNodePathname (Node, Message);
    AcpiOsPrintf (", %s\n", AcpiFormatException (MethodStatus));
}

void
AcpiUtMethodError (
    const char              *ModuleName,
    UINT32                  LineNumber,
    const char              *Message,
    ACPI_NAMESPACE_NODE     *PrefixNode,
    const char              *Path,
    ACPI_STATUS             MethodStatus)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node = PrefixNode;


    ACPI_MSG_REDIRECT_BEGIN;
    AcpiOsPrintf (ACPI_MSG_ERROR);

    if (Path)
    {
        Status = AcpiNsGetNode (PrefixNode, Path,
            ACPI_NS_NO_UPSEARCH, &Node);
        if (ACPI_FAILURE (Status))
        {
            AcpiOsPrintf ("[Could not get node by pathname]");
        }
    }

    AcpiNsPrintNodePathname (Node, Message);
    AcpiOsPrintf (", %s", AcpiFormatException (MethodStatus));

    ACPI_MSG_SUFFIX;
    ACPI_MSG_REDIRECT_END;
}

static ACPI_STATUS
AcpiNsRepair_TSS (
    ACPI_EVALUATE_INFO      *Info,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
{
    ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    /*
     * We can only sort the _TSS return package if there is no _PSS in the
     * same scope. This is because if _PSS is present, the ACPI specification
     * dictates that the _TSS Power Dissipation field is to be ignored, and
     * therefore some BIOSs leave garbage values in the _TSS Power field(s).
     * In this case, it is best to just return the _TSS package as-is.
     * (May, 2011)
     */
    Status = AcpiNsGetNode (Info->Node, "^_PSS",
        ACPI_NS_NO_UPSEARCH, &Node);
    if (ACPI_SUCCESS (Status))
    {
        return (AE_OK);
    }

    Status = AcpiNsCheckSortedList (Info, ReturnObject, 0, 5, 1,
                ACPI_SORT_DESCENDING, "PowerDissipation");

    return (Status);
}

char *
MpGetHidValue (
    ACPI_NAMESPACE_NODE     *DeviceNode)
{
    ACPI_NAMESPACE_NODE     *HidNode;
    char                    *HidString;
    ACPI_STATUS             Status;


    Status = AcpiNsGetNode (DeviceNode, METHOD_NAME__HID,
        ACPI_NS_NO_UPSEARCH, &HidNode);
    if (ACPI_FAILURE (Status))
    {
        goto ErrorExit;
    }

    /* If only partial namespace, get the _HID from the parse tree */

    if (!HidNode->Object)
    {
        return (MpGetHidFromParseTree (HidNode));
    }

    /* Handle the different _HID flavors */

    switch (HidNode->Type)
    {
    case ACPI_TYPE_STRING:

        return (HidNode->Object->String.Pointer);

    case ACPI_TYPE_INTEGER:

        /* Convert EISAID to a string */

        HidString = UtLocalCacheCalloc (ACPI_EISAID_STRING_SIZE);
        AcpiExEisaIdToString (HidString, HidNode->Object->Integer.Value);
        return (HidString);

    case ACPI_TYPE_METHOD:

        return ("-Method-");

    default:

        FlPrintFile (ASL_FILE_MAP_OUTPUT, "BAD HID TYPE: %u", HidNode->Type);
        break;
    }


ErrorExit:
    return ("-No HID-");
}

char *
MpGetHidViaNamestring (
    char                    *DeviceName)
{
    ACPI_NAMESPACE_NODE     *DeviceNode;
    ACPI_STATUS             Status;


    Status = AcpiNsGetNode (NULL, DeviceName, ACPI_NS_NO_UPSEARCH,
        &DeviceNode);
    if (ACPI_FAILURE (Status))
    {
        goto ErrorExit;
    }

    return (MpGetHidValue (DeviceNode));


ErrorExit:
    return ("-No HID-");
}

//.........这里部分代码省略.........
            switch (InitVal->Type)
            {
            case ACPI_TYPE_METHOD:

                ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val);
                ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID;

#if defined (ACPI_ASL_COMPILER)

                /* Save the parameter count for the iASL compiler */

                NewNode->Value = ObjDesc->Method.ParamCount;
#else
                /* Mark this as a very SPECIAL method */

                ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY;
                ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation;
#endif
                break;

            case ACPI_TYPE_INTEGER:

                ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val);
                break;

            case ACPI_TYPE_STRING:

                /* Build an object around the static string */

                ObjDesc->String.Length = (UINT32) strlen (Val);
                ObjDesc->String.Pointer = Val;
                ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
                break;

            case ACPI_TYPE_MUTEX:

                ObjDesc->Mutex.Node = NewNode;
                ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1);

                /* Create a mutex */

                Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex);
                if (ACPI_FAILURE (Status))
                {
                    AcpiUtRemoveReference (ObjDesc);
                    goto UnlockAndExit;
                }

                /* Special case for ACPI Global Lock */

                if (strcmp (InitVal->Name, "_GL_") == 0)
                {
                    AcpiGbl_GlobalLockMutex = ObjDesc;

                    /* Create additional counting semaphore for global lock */

                    Status = AcpiOsCreateSemaphore (
                        1, 0, &AcpiGbl_GlobalLockSemaphore);
                    if (ACPI_FAILURE (Status))
                    {
                        AcpiUtRemoveReference (ObjDesc);
                        goto UnlockAndExit;
                    }
                }
                break;

            default:

                ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X",
                    InitVal->Type));
                AcpiUtRemoveReference (ObjDesc);
                ObjDesc = NULL;
                continue;
            }

            /* Store pointer to value descriptor in the Node */

            Status = AcpiNsAttachObject (NewNode, ObjDesc,
                ObjDesc->Common.Type);

            /* Remove local reference to the object */

            AcpiUtRemoveReference (ObjDesc);
        }
    }


UnlockAndExit:
    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    /* Save a handle to "_GPE", it is always present */

    if (ACPI_SUCCESS (Status))
    {
        Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
            &AcpiGbl_FadtGpeDevice);
    }

    return_ACPI_STATUS (Status);
}

ACPI_STATUS
AcpiExLoadTableOp (
    ACPI_WALK_STATE         *WalkState,
    ACPI_OPERAND_OBJECT     **ReturnDesc)
{
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
    ACPI_NAMESPACE_NODE     *ParentNode;
    ACPI_NAMESPACE_NODE     *StartNode;
    ACPI_NAMESPACE_NODE     *ParameterNode = NULL;
    ACPI_OPERAND_OBJECT     *DdbHandle;
    ACPI_TABLE_HEADER       *Table;
    UINT32                  TableIndex;


    ACPI_FUNCTION_TRACE (ExLoadTableOp);


    /* Validate lengths for the SignatureString, OEMIDString, OEMTableID */

    if ((Operand[0]->String.Length > ACPI_NAME_SIZE) ||
        (Operand[1]->String.Length > ACPI_OEM_ID_SIZE) ||
        (Operand[2]->String.Length > ACPI_OEM_TABLE_ID_SIZE))
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Find the ACPI table in the RSDT/XSDT */

    Status = AcpiTbFindTable (Operand[0]->String.Pointer,
                              Operand[1]->String.Pointer,
                              Operand[2]->String.Pointer, &TableIndex);
    if (ACPI_FAILURE (Status))
    {
        if (Status != AE_NOT_FOUND)
        {
            return_ACPI_STATUS (Status);
        }

        /* Table not found, return an Integer=0 and AE_OK */

        DdbHandle = AcpiUtCreateIntegerObject ((UINT64) 0);
        if (!DdbHandle)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        *ReturnDesc = DdbHandle;
        return_ACPI_STATUS (AE_OK);
    }

    /* Default nodes */

    StartNode = WalkState->ScopeInfo->Scope.Node;
    ParentNode = AcpiGbl_RootNode;

    /* RootPath (optional parameter) */

    if (Operand[3]->String.Length > 0)
    {
        /*
         * Find the node referenced by the RootPathString.  This is the
         * location within the namespace where the table will be loaded.
         */
        Status = AcpiNsGetNode (StartNode, Operand[3]->String.Pointer,
                    ACPI_NS_SEARCH_PARENT, &ParentNode);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }

    /* ParameterPath (optional parameter) */

    if (Operand[4]->String.Length > 0)
    {
        if ((Operand[4]->String.Pointer[0] != '\\') &&
            (Operand[4]->String.Pointer[0] != '^'))
        {
            /*
             * Path is not absolute, so it will be relative to the node
             * referenced by the RootPathString (or the NS root if omitted)
             */
            StartNode = ParentNode;
        }

        /* Find the node referenced by the ParameterPathString */

        Status = AcpiNsGetNode (StartNode, Operand[4]->String.Pointer,
                    ACPI_NS_SEARCH_PARENT, &ParameterNode);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }

    /* Load the table into the namespace */

    Status = AcpiExAddTable (TableIndex, ParentNode, &DdbHandle);
    if (ACPI_FAILURE (Status))
//.........这里部分代码省略.........

ACPI_STATUS
AcpiEvMatchPrwAndGpe (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_GPE_WALK_INFO      *WalkInfo = ACPI_CAST_PTR (ACPI_GPE_WALK_INFO, Context);
    ACPI_NAMESPACE_NODE     *GpeDevice;
    ACPI_GPE_BLOCK_INFO     *GpeBlock;
    ACPI_NAMESPACE_NODE     *TargetGpeDevice;
    ACPI_NAMESPACE_NODE     *PrwNode;
    ACPI_GPE_EVENT_INFO     *GpeEventInfo;
    ACPI_OPERAND_OBJECT     *PkgDesc;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    UINT32                  GpeNumber;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (EvMatchPrwAndGpe);


    /* Check for a _PRW method under this device */

    Status = AcpiNsGetNode (ObjHandle, METHOD_NAME__PRW,
                ACPI_NS_NO_UPSEARCH, &PrwNode);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (AE_OK);
    }

    /* Check if requested OwnerId matches this OwnerId */

    if ((WalkInfo->ExecuteByOwnerId) &&
        (PrwNode->OwnerId != WalkInfo->OwnerId))
    {
        return_ACPI_STATUS (AE_OK);
    }

    /* Execute the _PRW */

    Status = AcpiUtEvaluateObject (PrwNode, NULL,
                ACPI_BTYPE_PACKAGE, &PkgDesc);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (AE_OK);
    }

    /* The returned _PRW package must have at least two elements */

    if (PkgDesc->Package.Count < 2)
    {
        goto Cleanup;
    }

    /* Extract pointers from the input context */

    GpeDevice = WalkInfo->GpeDevice;
    GpeBlock = WalkInfo->GpeBlock;

    /*
     * The _PRW object must return a package, we are only interested
     * in the first element
     */
    ObjDesc = PkgDesc->Package.Elements[0];

    if (ObjDesc->Common.Type == ACPI_TYPE_INTEGER)
    {
        /* Use FADT-defined GPE device (from definition of _PRW) */

        TargetGpeDevice = NULL;
        if (GpeDevice)
        {
            TargetGpeDevice = AcpiGbl_FadtGpeDevice;
        }

        /* Integer is the GPE number in the FADT described GPE blocks */

        GpeNumber = (UINT32) ObjDesc->Integer.Value;
    }
    else if (ObjDesc->Common.Type == ACPI_TYPE_PACKAGE)
    {
        /* Package contains a GPE reference and GPE number within a GPE block */

        if ((ObjDesc->Package.Count < 2) ||
            ((ObjDesc->Package.Elements[0])->Common.Type !=
                ACPI_TYPE_LOCAL_REFERENCE) ||
            ((ObjDesc->Package.Elements[1])->Common.Type !=
                ACPI_TYPE_INTEGER))
        {
            goto Cleanup;
        }

        /* Get GPE block reference and decode */

        TargetGpeDevice = ObjDesc->Package.Elements[0]->Reference.Node;
        GpeNumber = (UINT32) ObjDesc->Package.Elements[1]->Integer.Value;
    }
    else
    {
//.........这里部分代码省略.........

ACPI_STATUS
AcpiGetHandle (
    ACPI_HANDLE             Parent,
    ACPI_STRING             Pathname,
    ACPI_HANDLE             *RetHandle)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node = NULL;
    ACPI_NAMESPACE_NODE     *PrefixNode = NULL;


    FUNCTION_ENTRY ();


    /* Ensure that ACPI has been initialized */

    ACPI_IS_INITIALIZATION_COMPLETE (Status);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /* Parameter Validation */

    if (!RetHandle || !Pathname)
    {
        return (AE_BAD_PARAMETER);
    }

    /* Convert a parent handle to a prefix node */

    if (Parent)
    {
        AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);

        PrefixNode = AcpiNsConvertHandleToEntry (Parent);
        if (!PrefixNode)
        {
            AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
            return (AE_BAD_PARAMETER);
        }

        AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
    }

    /* Special case for root, since we can't search for it */

    if (STRCMP (Pathname, NS_ROOT_PATH) == 0)
    {
        *RetHandle = AcpiNsConvertEntryToHandle (AcpiGbl_RootNode);
        return (AE_OK);
    }

    /*
     *  Find the Node and convert to a handle
     */
    Status = AcpiNsGetNode (Pathname, PrefixNode, &Node);

    *RetHandle = NULL;
    if (ACPI_SUCCESS (Status))
    {
        *RetHandle = AcpiNsConvertEntryToHandle (Node);
    }

    return (Status);
}

ACPI_STATUS
AcpiGetHandle (
    ACPI_HANDLE             Parent,
    ACPI_STRING             Pathname,
    ACPI_HANDLE             *RetHandle)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node = NULL;
    ACPI_NAMESPACE_NODE     *PrefixNode = NULL;


    ACPI_FUNCTION_ENTRY ();


    /* Parameter Validation */

    if (!RetHandle || !Pathname)
    {
        return (AE_BAD_PARAMETER);
    }

    /* Convert a parent handle to a prefix node */

    if (Parent)
    {
        PrefixNode = AcpiNsMapHandleToNode (Parent);
        if (!PrefixNode)
        {
            return (AE_BAD_PARAMETER);
        }
    }

    /*
     * Valid cases are:
     * 1) Fully qualified pathname
     * 2) Parent + Relative pathname
     *
     * Error for <null Parent + relative path>
     */
    if (AcpiNsValidRootPrefix (Pathname[0]))
    {
        /* Pathname is fully qualified (starts with '\') */

        /* Special case for root-only, since we can't search for it */

        if (!ACPI_STRCMP (Pathname, ACPI_NS_ROOT_PATH))
        {
            *RetHandle = AcpiNsConvertEntryToHandle (AcpiGbl_RootNode);
            return (AE_OK);
        }
    }
    else if (!PrefixNode)
    {
        /* Relative path with null prefix is disallowed */

        return (AE_BAD_PARAMETER);
    }

    /* Find the Node and convert to a handle */

    Status = AcpiNsGetNode (PrefixNode, Pathname, ACPI_NS_NO_UPSEARCH, &Node);
    if (ACPI_SUCCESS (Status))
    {
        *RetHandle = AcpiNsConvertEntryToHandle (Node);
    }

    return (Status);
}

ACPI_STATUS
AcpiNsEvaluate (
    ACPI_EVALUATE_INFO      *Info)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    ACPI_FUNCTION_TRACE (NsEvaluate);


    if (!Info)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Initialize the return value to an invalid object */

    Info->ReturnObject = NULL;
    Info->ParamCount = 0;

    /*
     * Get the actual namespace node for the target object. Handles these cases:
     *
     * 1) Null node, Pathname (absolute path)
     * 2) Node, Pathname (path relative to Node)
     * 3) Node, Null Pathname
     */
    Status = AcpiNsGetNode (Info->PrefixNode, Info->Pathname,
                ACPI_NS_NO_UPSEARCH, &Info->ResolvedNode);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * For a method alias, we must grab the actual method node so that proper
     * scoping context will be established before execution.
     */
    if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
    {
        Info->ResolvedNode =
            ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Info->ResolvedNode->Object);
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n", Info->Pathname,
        Info->ResolvedNode, AcpiNsGetAttachedObject (Info->ResolvedNode)));

    Node = Info->ResolvedNode;

    /*
     * Two major cases here:
     *
     * 1) The object is a control method -- execute it
     * 2) The object is not a method -- just return it's current value
     */
    if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_METHOD)
    {
        /*
         * 1) Object is a control method - execute it
         */

        /* Verify that there is a method object associated with this node */

        Info->ObjDesc = AcpiNsGetAttachedObject (Info->ResolvedNode);
        if (!Info->ObjDesc)
        {
            ACPI_ERROR ((AE_INFO, "Control method has no attached sub-object"));
            return_ACPI_STATUS (AE_NULL_OBJECT);
        }

        /* Count the number of arguments being passed to the method */

        if (Info->Parameters)
        {
            while (Info->Parameters[Info->ParamCount])
            {
                if (Info->ParamCount > ACPI_METHOD_MAX_ARG)
                {
                    return_ACPI_STATUS (AE_LIMIT);
                }
                Info->ParamCount++;
            }
        }

        ACPI_DUMP_PATHNAME (Info->ResolvedNode, "ACPI: Execute Method",
            ACPI_LV_INFO, _COMPONENT);

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
            "Method at AML address %p Length %X\n",
            Info->ObjDesc->Method.AmlStart + 1,
            Info->ObjDesc->Method.AmlLength - 1));

        /*
         * Any namespace deletion must acquire both the namespace and
         * interpreter locks to ensure that no thread is using the portion of
         * the namespace that is being deleted.
         *
         * Execute the method via the interpreter. The interpreter is locked
         * here before calling into the AML parser
//.........这里部分代码省略.........

ACPI_STATUS
AcpiNsEvaluate (
    ACPI_EVALUATE_INFO      *Info)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (NsEvaluate);


    if (!Info)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    if (!Info->Node)
    {
        /*
         * Get the actual namespace node for the target object if we
         * need to. Handles these cases:
         *
         * 1) Null node, valid pathname from root (absolute path)
         * 2) Node and valid pathname (path relative to Node)
         * 3) Node, Null pathname
         */
        Status = AcpiNsGetNode (Info->PrefixNode, Info->RelativePathname,
            ACPI_NS_NO_UPSEARCH, &Info->Node);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }

    /*
     * For a method alias, we must grab the actual method node so that
     * proper scoping context will be established before execution.
     */
    if (AcpiNsGetType (Info->Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
    {
        Info->Node = ACPI_CAST_PTR (
            ACPI_NAMESPACE_NODE, Info->Node->Object);
    }

    /* Complete the info block initialization */

    Info->ReturnObject = NULL;
    Info->NodeFlags = Info->Node->Flags;
    Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);

    ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
        Info->RelativePathname, Info->Node,
        AcpiNsGetAttachedObject (Info->Node)));

    /* Get info if we have a predefined name (_HID, etc.) */

    Info->Predefined = AcpiUtMatchPredefinedMethod (Info->Node->Name.Ascii);

    /* Get the full pathname to the object, for use in warning messages */

    Info->FullPathname = AcpiNsGetExternalPathname (Info->Node);
    if (!Info->FullPathname)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /* Count the number of arguments being passed in */

    Info->ParamCount = 0;
    if (Info->Parameters)
    {
        while (Info->Parameters[Info->ParamCount])
        {
            Info->ParamCount++;
        }

        /* Warn on impossible argument count */

        if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
        {
            ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
                "Excess arguments (%u) - using only %u",
                Info->ParamCount, ACPI_METHOD_NUM_ARGS));

            Info->ParamCount = ACPI_METHOD_NUM_ARGS;
        }
    }

    /*
     * For predefined names: Check that the declared argument count
     * matches the ACPI spec -- otherwise this is a BIOS error.
     */
    AcpiNsCheckAcpiCompliance (Info->FullPathname, Info->Node,
        Info->Predefined);

    /*
     * For all names: Check that the incoming argument count for
     * this method/object matches the actual ASL/AML definition.
     */
    AcpiNsCheckArgumentCount (Info->FullPathname, Info->Node,
        Info->ParamCount, Info->Predefined);
//.........这里部分代码省略.........

void
AcpiDbSetScope (
    char                    *Name)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    if (!Name || Name[0] == 0)
    {
        AcpiOsPrintf ("Current scope: %s\n", AcpiGbl_DbScopeBuf);
        return;
    }

    AcpiDbPrepNamestring (Name);

    if (ACPI_IS_ROOT_PREFIX (Name[0]))
    {
        /* Validate new scope from the root */

        Status = AcpiNsGetNode (AcpiGbl_RootNode, Name, ACPI_NS_NO_UPSEARCH,
                    &Node);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        AcpiGbl_DbScopeBuf[0] = 0;
    }
    else
    {
        /* Validate new scope relative to old scope */

        Status = AcpiNsGetNode (AcpiGbl_DbScopeNode, Name, ACPI_NS_NO_UPSEARCH,
                    &Node);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }
    }

    /* Build the final pathname */

    if (AcpiUtSafeStrcat (AcpiGbl_DbScopeBuf, sizeof (AcpiGbl_DbScopeBuf),
        Name))
    {
        Status = AE_BUFFER_OVERFLOW;
        goto ErrorExit;
    }

    if (AcpiUtSafeStrcat (AcpiGbl_DbScopeBuf, sizeof (AcpiGbl_DbScopeBuf),
        "\\"))
    {
        Status = AE_BUFFER_OVERFLOW;
        goto ErrorExit;
    }

    AcpiGbl_DbScopeNode = Node;
    AcpiOsPrintf ("New scope: %s\n", AcpiGbl_DbScopeBuf);
    return;

ErrorExit:

    AcpiOsPrintf ("Could not attach scope: %s, %s\n",
        Name, AcpiFormatException (Status));
}