utobject.c

linux-2.6.15.6

	if (!object) {
		_ACPI_REPORT_ERROR(module_name, line_number, component_id,
				   ("Could not allocate an object descriptor\n"));

		return_PTR(NULL);
	}

	/* Mark the descriptor type */
	memset(object, 0, sizeof(union acpi_operand_object));
	ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
			  object, (u32) sizeof(union acpi_operand_object)));

	return_PTR(object);
}

/*******************************************************************************
 *
 * 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;
	}

	(void)acpi_os_release_object(acpi_gbl_operand_cache, object);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_simple_object_size
 *
 * PARAMETERS:  internal_object    - An ACPI operand object
 *              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.
 *
 ******************************************************************************/

static 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.
 *
 ******************************************************************************/

static 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     - An ACPI internal object
 *              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.
 *
 ******************************************************************************/

static 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     - An ACPI internal object
 *              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);
}