utobject.c

acpi tools for linux include acpiexec and acpixtract

 ******************************************************************************/

BOOLEAN
AcpiUtValidInternalObject (
    void                    *Object)
{

    ACPI_FUNCTION_NAME (UtValidInternalObject);


    /* Check for a null pointer */

    if (!Object)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "**** Null Object Ptr\n"));
        return (FALSE);
    }

    /* Check the descriptor type field */

    switch (ACPI_GET_DESCRIPTOR_TYPE (Object))
    {
    case ACPI_DESC_TYPE_OPERAND:

        /* The object appears to be a valid ACPI_OPERAND_OBJECT  */

        return (TRUE);

    default:
        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
                "%p is not not an ACPI operand obj [%s]\n",
                Object, AcpiUtGetDescriptorName (Object)));
        break;
    }

    return (FALSE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtAllocateObjectDescDbg
 *
 * PARAMETERS:  ModuleName          - Caller's module name (for error output)
 *              LineNumber          - Caller's line number (for error output)
 *              ComponentId         - Caller's component ID (for error output)
 *
 * RETURN:      Pointer to newly allocated object descriptor.  Null on error
 *
 * DESCRIPTION: Allocate a new object descriptor.  Gracefully handle
 *              error conditions.
 *
 ******************************************************************************/

void *
AcpiUtAllocateObjectDescDbg (
    char                    *ModuleName,
    UINT32                  LineNumber,
    UINT32                  ComponentId)
{
    ACPI_OPERAND_OBJECT     *Object;


    ACPI_FUNCTION_TRACE (UtAllocateObjectDescDbg);


    Object = AcpiOsAcquireObject (AcpiGbl_OperandCache);
    if (!Object)
    {
        ACPI_ERROR ((ModuleName, LineNumber,
            "Could not allocate an object descriptor"));

        return_PTR (NULL);
    }

    /* Mark the descriptor type */

    ACPI_SET_DESCRIPTOR_TYPE (Object, ACPI_DESC_TYPE_OPERAND);

    ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
            Object, (UINT32) sizeof (ACPI_OPERAND_OBJECT)));

    return_PTR (Object);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtDeleteObjectDesc
 *
 * PARAMETERS:  Object          - An Acpi internal object to be deleted
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
 *
 ******************************************************************************/

void
AcpiUtDeleteObjectDesc (
    ACPI_OPERAND_OBJECT     *Object)
{
    ACPI_FUNCTION_TRACE_PTR (UtDeleteObjectDesc, Object);


    /* Object must be an ACPI_OPERAND_OBJECT  */

    if (ACPI_GET_DESCRIPTOR_TYPE (Object) != ACPI_DESC_TYPE_OPERAND)
    {
        ACPI_ERROR ((AE_INFO,
            "%p is not an ACPI Operand object [%s]", Object,
            AcpiUtGetDescriptorName (Object)));
        return_VOID;
    }

    (void) AcpiOsReleaseObject (AcpiGbl_OperandCache, Object);
    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtGetSimpleObjectSize
 *
 * PARAMETERS:  InternalObject     - An ACPI operand object
 *              ObjLength          - Where the length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain a simple object for return to an external user.
 *
 *              The length includes the object structure plus any additional
 *              needed space.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiUtGetSimpleObjectSize (
    ACPI_OPERAND_OBJECT     *InternalObject,
    ACPI_SIZE               *ObjLength)
{
    ACPI_SIZE               Length;
    ACPI_STATUS             Status = AE_OK;


    ACPI_FUNCTION_TRACE_PTR (UtGetSimpleObjectSize, InternalObject);


    /*
     * Handle a null object (Could be a uninitialized package
     * element -- which is legal)
     */
    if (!InternalObject)
    {
        *ObjLength = 0;
        return_ACPI_STATUS (AE_OK);
    }

    /* Start with the length of the Acpi object */

    Length = sizeof (ACPI_OBJECT);

    if (ACPI_GET_DESCRIPTOR_TYPE (InternalObject) == ACPI_DESC_TYPE_NAMED)
    {
        /* Object is a named object (reference), just return the length */

        *ObjLength = ACPI_ROUND_UP_TO_NATIVE_WORD (Length);
        return_ACPI_STATUS (Status);
    }

    /*
     * The final length depends on the object type
     * Strings and Buffers are packed right up against the parent object and
     * must be accessed bytewise or there may be alignment problems on
     * certain processors
     */
    switch (ACPI_GET_OBJECT_TYPE (InternalObject))
    {
    case ACPI_TYPE_STRING:

        Length += (ACPI_SIZE) InternalObject->String.Length + 1;
        break;


    case ACPI_TYPE_BUFFER:

        Length += (ACPI_SIZE) InternalObject->Buffer.Length;
        break;


    case ACPI_TYPE_INTEGER:
    case ACPI_TYPE_PROCESSOR:
    case ACPI_TYPE_POWER:

        /*
         * No extra data for these types
         */
        break;


    case ACPI_TYPE_LOCAL_REFERENCE:

        switch (InternalObject->Reference.Opcode)
        {
        case AML_INT_NAMEPATH_OP:

            /*
             * Get the actual length of the full pathname to this object.
             * The reference will be converted to the pathname to the object
             */
            Length += ACPI_ROUND_UP_TO_NATIVE_WORD (
                        AcpiNsGetPathnameLength (InternalObject->Reference.Node));
            break;

        default:

            /*
             * No other reference opcodes are supported.
             * Notably, Locals and Args are not supported, but this may be
             * required eventually.
             */
            ACPI_ERROR ((AE_INFO,
                "Unsupported Reference opcode=%X in object %p",
                InternalObject->Reference.Opcode, InternalObject));
            Status = AE_TYPE;
            break;
        }
        break;


    default:

        ACPI_ERROR ((AE_INFO, "Unsupported type=%X in object %p",
            ACPI_GET_OBJECT_TYPE (InternalObject), InternalObject));
        Status = AE_TYPE;
        break;
    }

    /*
     * Account for the space required by the object rounded up to the next
     * multiple of the machine word size.  This keeps each object aligned
     * on a machine word boundary. (preventing alignment faults on some
     * machines.)
     */
    *ObjLength = ACPI_ROUND_UP_TO_NATIVE_WORD (Length);
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtGetElementLength
 *
 * PARAMETERS:  ACPI_PKG_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the length of one package element.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiUtGetElementLength (
    UINT8                   ObjectType,
    ACPI_OPERAND_OBJECT     *SourceObject,
    ACPI_GENERIC_STATE      *State,
    void                    *Context)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_PKG_INFO           *Info = (ACPI_PKG_INFO *) Context;
    ACPI_SIZE               ObjectSpace;


    switch (ObjectType)
    {
    case ACPI_COPY_TYPE_SIMPLE:

        /*
         * Simple object - just get the size (Null object/entry is handled
         * here also) and sum it into the running package length
         */
        Status = AcpiUtGetSimpleObjectSize (SourceObject, &ObjectSpace);
        if (ACPI_FAILURE (Status))
        {
            return (Status);
        }

        Info->Length += ObjectSpace;
        break;


    case ACPI_COPY_TYPE_PACKAGE:

        /* Package object - nothing much to do here, let the walk handle it */

        Info->NumPackages++;
        State->Pkg.ThisTargetObj = NULL;
        break;


    default:

        /* No other types allowed */

        return (AE_BAD_PARAMETER);
    }

    return (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtGetPackageObjectSize
 *
 * PARAMETERS:  InternalObject      - An ACPI internal object
 *              ObjLength           - Where the length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain a package object for return to an external user.
 *
 *              This is moderately complex since a package contains other
 *              objects including packages.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiUtGetPackageObjectSize (
    ACPI_OPERAND_OBJECT     *InternalObject,
    ACPI_SIZE               *ObjLength)
{
    ACPI_STATUS             Status;
    ACPI_PKG_INFO           Info;


    ACPI_FUNCTION_TRACE_PTR (UtGetPackageObjectSize, InternalObject);


    Info.Length      = 0;
    Info.ObjectSpace = 0;
    Info.NumPackages = 1;

    Status = AcpiUtWalkPackageTree (InternalObject, NULL,
                            AcpiUtGetElementLength, &Info);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * We have handled all of the objects in all levels of the package.
     * just add the length of the package objects themselves.
     * Round up to the next machine word.
     */
    Info.Length += ACPI_ROUND_UP_TO_NATIVE_WORD (sizeof (ACPI_OBJECT)) *
                    (ACPI_SIZE) Info.NumPackages;

    /* Return the total package length */

    *ObjLength = Info.Length;
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtGetObjectSize
 *
 * PARAMETERS:  InternalObject      - An ACPI internal object
 *              ObjLength           - Where the length will be returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain an object for return to an API user.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiUtGetObjectSize (
    ACPI_OPERAND_OBJECT     *InternalObject,
    ACPI_SIZE               *ObjLength)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_ENTRY ();


    if ((ACPI_GET_DESCRIPTOR_TYPE (InternalObject) == ACPI_DESC_TYPE_OPERAND) &&
        (ACPI_GET_OBJECT_TYPE (InternalObject) == ACPI_TYPE_PACKAGE))
    {
        Status = AcpiUtGetPackageObjectSize (InternalObject, ObjLength);
    }
    else
    {
        Status = AcpiUtGetSimpleObjectSize (InternalObject, ObjLength);
    }

    return (Status);
}