utobject.c

h内核

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_object_desc
 *
 * 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
acpi_ut_delete_object_desc (
	union acpi_operand_object       *object)
{
	ACPI_FUNCTION_TRACE_PTR ("ut_delete_object_desc", object);


	/* Object must be an union acpi_operand_object    */

	if (ACPI_GET_DESCRIPTOR_TYPE (object) != ACPI_DESC_TYPE_OPERAND) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"%p is not an ACPI Operand object [%s]\n", object,
				acpi_ut_get_descriptor_name (object)));
		return_VOID;
	}

	acpi_ut_release_to_cache (ACPI_MEM_LIST_OPERAND, object);

	return_VOID;
}


#ifdef ACPI_ENABLE_OBJECT_CACHE
/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_object_cache
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Purge the global state object cache.  Used during subsystem
 *              termination.
 *
 ******************************************************************************/

void
acpi_ut_delete_object_cache (
	void)
{
	ACPI_FUNCTION_TRACE ("ut_delete_object_cache");


	acpi_ut_delete_generic_cache (ACPI_MEM_LIST_OPERAND);
	return_VOID;
}
#endif


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_simple_object_size
 *
 * PARAMETERS:  *internal_object    - Pointer to the object we are examining
 *              *obj_length         - 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.
 *
 ******************************************************************************/

acpi_status
acpi_ut_get_simple_object_size (
	union acpi_operand_object       *internal_object,
	acpi_size                       *obj_length)
{
	acpi_size                       length;
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE_PTR ("ut_get_simple_object_size", internal_object);


	/* Handle a null object (Could be a uninitialized package element -- which is legal) */

	if (!internal_object) {
		*obj_length = 0;
		return_ACPI_STATUS (AE_OK);
	}

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

	length = sizeof (union acpi_object);

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

		*obj_length = 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 (internal_object)) {
	case ACPI_TYPE_STRING:

		length += (acpi_size) internal_object->string.length + 1;
		break;


	case ACPI_TYPE_BUFFER:

		length += (acpi_size) internal_object->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 (internal_object->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 (acpi_ns_get_pathname_length (internal_object->reference.node));
			break;

		default:

			/*
			 * No other reference opcodes are supported.
			 * Notably, Locals and Args are not supported, but this may be
			 * required eventually.
			 */
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"Unsupported Reference opcode=%X in object %p\n",
				internal_object->reference.opcode, internal_object));
			status = AE_TYPE;
			break;
		}
		break;


	default:

		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unsupported type=%X in object %p\n",
			ACPI_GET_OBJECT_TYPE (internal_object), internal_object));
		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.)
	 */
	*obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD (length);
	return_ACPI_STATUS (status);
}


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

acpi_status
acpi_ut_get_element_length (
	u8                              object_type,
	union acpi_operand_object       *source_object,
	union acpi_generic_state        *state,
	void                            *context)
{
	acpi_status                     status = AE_OK;
	struct acpi_pkg_info            *info = (struct acpi_pkg_info *) context;
	acpi_size                       object_space;


	switch (object_type) {
	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 = acpi_ut_get_simple_object_size (source_object, &object_space);
		if (ACPI_FAILURE (status)) {
			return (status);
		}

		info->length += object_space;
		break;


	case ACPI_COPY_TYPE_PACKAGE:

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

		info->num_packages++;
		state->pkg.this_target_obj = NULL;
		break;


	default:

		/* No other types allowed */

		return (AE_BAD_PARAMETER);
	}

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_package_object_size
 *
 * PARAMETERS:  *internal_object    - Pointer to the object we are examining
 *              *obj_length         - 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.
 *
 ******************************************************************************/

acpi_status
acpi_ut_get_package_object_size (
	union acpi_operand_object       *internal_object,
	acpi_size                       *obj_length)
{
	acpi_status                     status;
	struct acpi_pkg_info            info;


	ACPI_FUNCTION_TRACE_PTR ("ut_get_package_object_size", internal_object);


	info.length      = 0;
	info.object_space = 0;
	info.num_packages = 1;

	status = acpi_ut_walk_package_tree (internal_object, NULL,
			 acpi_ut_get_element_length, &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 (union acpi_object)) *
			  (acpi_size) info.num_packages;

	/* Return the total package length */

	*obj_length = info.length;
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_object_size
 *
 * PARAMETERS:  *internal_object    - Pointer to the object we are examining
 *              *obj_length         - 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
acpi_ut_get_object_size(
	union acpi_operand_object       *internal_object,
	acpi_size                       *obj_length)
{
	acpi_status                     status;


	ACPI_FUNCTION_ENTRY ();


	if ((ACPI_GET_DESCRIPTOR_TYPE (internal_object) == ACPI_DESC_TYPE_OPERAND) &&
		(ACPI_GET_OBJECT_TYPE (internal_object) == ACPI_TYPE_PACKAGE)) {
		status = acpi_ut_get_package_object_size (internal_object, obj_length);
	}
	else {
		status = acpi_ut_get_simple_object_size (internal_object, obj_length);
	}

	return (status);
}