asllookup.c

acpi tools for linux include acpiexec and acpixtract

    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    LsDisplayNamespace
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk the namespace an display information about each node
 *              in the tree.  Information is written to the optional
 *              namespace output file.
 *
 ******************************************************************************/

ACPI_STATUS
LsDisplayNamespace (
    void)
{
    ACPI_STATUS             Status;


    if (!Gbl_NsOutputFlag)
    {
        return (AE_OK);
    }

    Gbl_NumNamespaceObjects = 0;

    /* File header */

    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "Contents of ACPI Namespace\n\n");
    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "Count  Depth    Name - Type\n\n");

    /* Walk entire namespace from the root */

    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
                ACPI_UINT32_MAX, FALSE, LsDoOneNamespaceObject,
                NULL, NULL);

    /* Print the full pathname for each namespace node */

    FlPrintFile (ASL_FILE_NAMESPACE_OUTPUT, "\nNamespace pathnames\n\n");

    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
                ACPI_UINT32_MAX, FALSE, LsDoOnePathname,
                NULL, NULL);

    return (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    LsCompareOneNamespaceObject
 *
 * PARAMETERS:  ACPI_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Compare name of one object.
 *
 ******************************************************************************/

static ACPI_STATUS
LsCompareOneNamespaceObject (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_NAMESPACE_NODE     *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;


    /* Simply check the name */

    if (*((UINT32 *) (Context)) == Node->Name.Integer)
    {
        /* Abort walk if we found one instance */

        return (AE_CTRL_TRUE);
    }

    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    LkObjectExists
 *
 * PARAMETERS:  Name            - 4 char ACPI name
 *
 * RETURN:      TRUE if name exists in namespace
 *
 * DESCRIPTION: Walk the namespace to find an object
 *
 ******************************************************************************/

static BOOLEAN
LkObjectExists (
    char                    *Name)
{
    ACPI_STATUS             Status;


    /* Walk entire namespace from the supplied root */

    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
                ACPI_UINT32_MAX, FALSE, LsCompareOneNamespaceObject,
                Name, NULL);
    if (Status == AE_CTRL_TRUE)
    {
        /* At least one instance of the name was found */

        return (TRUE);
    }

    return (FALSE);
}


/*******************************************************************************
 *
 * FUNCTION:    LkGetNameOp
 *
 * PARAMETERS:  Op              - Current Op
 *
 * RETURN:      NameOp associated with the input op
 *
 * DESCRIPTION: Find the name declaration op associated with the operator
 *
 ******************************************************************************/

ACPI_PARSE_OBJECT *
LkGetNameOp (
    ACPI_PARSE_OBJECT       *Op)
{
    const ACPI_OPCODE_INFO  *OpInfo;
    ACPI_PARSE_OBJECT       *NameOp = Op;


    OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);


    /* Get the NamePath from the appropriate place */

    if (OpInfo->Flags & AML_NAMED)
    {
        /* For nearly all NAMED operators, the name reference is the first child */

        NameOp = Op->Asl.Child;
        if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
        {
            /*
             * ALIAS is the only oddball opcode, the name declaration
             * (alias name) is the second operand
             */
            NameOp = Op->Asl.Child->Asl.Next;
        }
    }
    else if (OpInfo->Flags & AML_CREATE)
    {
        /* Name must appear as the last parameter */

        NameOp = Op->Asl.Child;
        while (!(NameOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))
        {
            NameOp = NameOp->Asl.Next;
        }
    }

    return (NameOp);
}


/*******************************************************************************
 *
 * FUNCTION:    LkIsObjectUsed
 *
 * PARAMETERS:  ACPI_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check for an unreferenced namespace object and emit a warning.
 *              We have to be careful, because some types and names are
 *              typically or always unreferenced, we don't want to issue
 *              excessive warnings.
 *
 ******************************************************************************/

static ACPI_STATUS
LkIsObjectUsed (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);


    /* Referenced flag is set during the namespace xref */

    if (Node->Flags & ANOBJ_IS_REFERENCED)
    {
        return (AE_OK);
    }

    /*
     * Ignore names that start with an underscore,
     * these are the reserved ACPI names and are typically not referenced,
     * they are called by the host OS.
     */
    if (Node->Name.Ascii[0] == '_')
    {
        return (AE_OK);
    }

    /* There are some types that are typically not referenced, ignore them */

    switch (Node->Type)
    {
    case ACPI_TYPE_DEVICE:
    case ACPI_TYPE_PROCESSOR:
    case ACPI_TYPE_POWER:
    case ACPI_TYPE_LOCAL_RESOURCE:
        return (AE_OK);

    default:
        break;
    }

    /* All others are valid unreferenced namespace objects */

    if (Node->Op)
    {
        AslError (ASL_WARNING2, ASL_MSG_NOT_REFERENCED, LkGetNameOp (Node->Op), NULL);
    }
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    LkFindUnreferencedObjects
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Namespace walk to find objects that are not referenced in any
 *              way. Must be called after the namespace has been cross
 *              referenced.
 *
 ******************************************************************************/

void
LkFindUnreferencedObjects (
    void)
{

    /* Walk entire namespace from the supplied root */

    (void) AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
                ACPI_UINT32_MAX, FALSE, LkIsObjectUsed,
                NULL, NULL);
}


/*******************************************************************************
 *
 * FUNCTION:    LkCrossReferenceNamespace
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform a cross reference check of the parse tree against the
 *              namespace.  Every named referenced within the parse tree
 *              should be get resolved with a namespace lookup.  If not, the
 *              original reference in the ASL code is invalid -- i.e., refers
 *              to a non-existent object.
 *
 * NOTE:  The ASL "External" operator causes the name to be inserted into the
 *        namespace so that references to the external name will be resolved
 *        correctly here.
 *
 ******************************************************************************/

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;
}


/*******************************************************************************
 *
 * FUNCTION:    LkCheckFieldRange
 *
 * PARAMETERS:  RegionBitLength     - Length of entire parent region
 *              FieldBitOffset      - Start of the field unit (within region)
 *              FieldBitLength      - Entire length of field unit
 *              AccessBitWidth      - Access width of the field unit
 *
 * RETURN:      None
 *
 * DESCRIPTION: Check one field unit to make sure it fits in the parent
 *              op region.
 *
 * Note: AccessBitWidth must be either 8,16,32, or 64
 *
 ******************************************************************************/

static void
LkCheckFieldRange (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  RegionBitLength,
    UINT32                  FieldBitOffset,
    UINT32                  FieldBitLength,
    UINT32                  AccessBitWidth)
{
    UINT32                  FieldEndBitOffset;


    /*
     * Check each field unit against the region size.  The entire
     * field unit (start offset plus length) must fit within the
     * region.
     */
    FieldEndBitOffset = FieldBitOffset + FieldBitLength;

    if (FieldEndBitOffset > RegionBitLength)
    {
        /* Field definition itself is beyond the end-of-region */

        AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_OFFSET, Op, NULL);
        return;
    }

    /*
     * Now check that the field plus AccessWidth doesn't go beyond
     * the end-of-region.  Assumes AccessBitWidth is a power of 2
     */
    FieldEndBitOffset = ACPI_ROUND_UP (FieldEndBitOffset, AccessBitWidth);

    if (FieldEndBitOffset > RegionBitLength)
    {
        /* Field definition combined with the access is beyond EOR */

        AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_ACCESS_WIDTH, Op, NULL);
    }
}

/*******************************************************************************
 *
 * FUNCTION:    LkNamespaceLocateBegin
 *
 * PARAMETERS:  ASL_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during cross-reference.  For named
 *              object references, attempt to locate the name in the
 *              namespace.
 *
 * NOTE: ASL references to named fields within resource descriptors are
 *       resolved to integer values here.  Therefore, this step is an
 *       important part of the code generation.  We don't know that the
 *       name refers to a resource descriptor until now.
 *
 ******************************************************************************/

static ACPI_STATUS
LkNamespaceLocateBegin (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  Level,
    void                    *Context)
{
    ACPI_WALK_STATE         *WalkState = (ACPI_WALK_STATE *) Context;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;
    ACPI_OBJECT_TYPE        ObjectType;
    char                    *Path;
    UINT8                   PassedArgs;
    ACPI_PARSE_OBJECT       *NextOp;
    ACPI_PARSE_OBJECT       *OwningOp;
    ACPI_PARSE_OBJECT       *SpaceIdOp;
    UINT32                  MinimumLength;
    UINT32                  Temp;
    const ACPI_OPCODE_INFO  *OpInfo;
    UINT32                  Flags;


    ACPI_FUNCTION_TRACE_PTR (LkNamespaceLocateBegin, Op);

    /*
     * If this node is the actual declaration of a name
     * [such as the XXXX name in "Method (XXXX)"],
     * we are not interested in it here.  We only care about names that are
     * references to other objects within the namespace and the parent objects
     * of name declarations
     */
    if (Op->Asl.CompileFlags & NODE_IS_NAME_DECLARATION)
    {
        return (AE_OK);
    }

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

    OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);

    if ((!(OpInfo->Flags & AML_NAMED)) &&
        (!(OpInfo->Flags & AML_CREATE)) &&
        (Op->Asl.ParseOpcode != PARSEOP_NAMESTRING) &&
        (Op->Asl.ParseOpcode != PARSEOP_NAMESEG)    &&
        (Op->Asl.ParseOpcode != PARSEOP_METHODCALL))
    {
        return (AE_OK);
    }

    /*
     * We must enable the "search-to-root" for single NameSegs, but
     * we have to be very careful about opening up scopes
     */
    Flags = ACPI_NS_SEARCH_PARENT;
    if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) ||
        (Op->Asl.ParseOpcode == PARSEOP_NAMESEG)    ||
        (Op->Asl.ParseOpcode == PARSEOP_METHODCALL))
    {
        /*
         * These are name references, do not push the scope stack
         * for them.
         */
        Flags |= ACPI_NS_DONT_OPEN_SCOPE;
    }

    /* Get the NamePath from the appropriate place */

    if (OpInfo->Flags & AML_NAMED)
    {
        /* For nearly all NAMED operators, the name reference is the first child */

        Path = Op->Asl.Child->Asl.Value.String;
        if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
        {
            /*
             * ALIAS is the only oddball opcode, the name declaration
             * (alias name) is the second operand
             */
            Path = Op->Asl.Child->Asl.Next->Asl.Value.String;
        }
    }
    else if (OpInfo->Flags & AML_CREATE)
    {