cmobject.c

winNT技术操作系统,国外开放的原代码和LIUX一样

	return;
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_init_static_object
 *
 * PARAMETERS:  Obj_desc            - Pointer to a "static" object - on stack
 *                                    or in the data segment.
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Initialize a static object.  Sets flags to disallow dynamic
 *              deletion of the object.
 *
 ******************************************************************************/

void
acpi_cm_init_static_object (
	ACPI_OPERAND_OBJECT     *obj_desc)
{


	if (!obj_desc) {
		return;
	}


	/*
	 * Clear the entire descriptor
	 */
	MEMSET ((void *) obj_desc, 0, sizeof (ACPI_OPERAND_OBJECT));


	/*
	 * Initialize the header fields
	 * 1) This is an ACPI_OPERAND_OBJECT  descriptor
	 * 2) The size is the full object (worst case)
	 * 3) The flags field indicates static allocation
	 * 4) Reference count starts at one (not really necessary since the
	 *    object can't be deleted, but keeps everything sane)
	 */

	obj_desc->common.data_type      = ACPI_DESC_TYPE_INTERNAL;
	obj_desc->common.flags          = AOPOBJ_STATIC_ALLOCATION;
	obj_desc->common.reference_count = 1;

	return;
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_get_simple_object_size
 *
 * PARAMETERS:  *Internal_object    - Pointer to the object we are examining
 *              *Ret_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 API user.
 *
 *              The length includes the object structure plus any additional
 *              needed space.
 *
 ******************************************************************************/

ACPI_STATUS
acpi_cm_get_simple_object_size (
	ACPI_OPERAND_OBJECT     *internal_object,
	u32                     *obj_length)
{
	u32                     length;
	ACPI_STATUS             status = AE_OK;


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

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


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

	length = sizeof (ACPI_OBJECT);

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

		*obj_length = (u32) ROUND_UP_TO_NATIVE_WORD (length);
		return (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 (internal_object->common.type) {

	case ACPI_TYPE_STRING:

		length += internal_object->string.length + 1;
		break;


	case ACPI_TYPE_BUFFER:

		length += 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 INTERNAL_TYPE_REFERENCE:

		/*
		 * The only type that should be here is opcode AML_NAMEPATH_OP -- since
		 * this means an object reference
		 */
		if (internal_object->reference.opcode != AML_NAMEPATH_OP) {
			status = AE_TYPE;
		}

		else {
			/*
			 * Get the actual length of the full pathname to this object.
			 * The reference will be converted to the pathname to the object
			 */
			length += ROUND_UP_TO_NATIVE_WORD (acpi_ns_get_pathname_length (internal_object->reference.node));
		}
		break;


	default:

		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 = (u32) ROUND_UP_TO_NATIVE_WORD (length);

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_get_element_length
 *
 * PARAMETERS:  ACPI_PKG_CALLBACK
 *
 * RETURN:      Status          - the status of the call
 *
 * DESCRIPTION: Get the length of one package element.
 *
 ******************************************************************************/

ACPI_STATUS
acpi_cm_get_element_length (
	u8                      object_type,
	ACPI_OPERAND_OBJECT     *source_object,
	ACPI_GENERIC_STATE      *state,
	void                    *context)
{
	ACPI_STATUS             status = AE_OK;
	ACPI_PKG_INFO           *info = (ACPI_PKG_INFO *) context;
	u32                     object_space;


	switch (object_type) {
	case 0:

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

		info->length += object_space;
		break;


	case 1:
		/* Package - nothing much to do here, let the walk handle it */

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

	default:
		return (AE_BAD_PARAMETER);
	}


	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_get_package_object_size
 *
 * PARAMETERS:  *Internal_object    - Pointer to the object we are examining
 *              *Ret_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 API user.
 *
 *              This is moderately complex since a package contains other
 *              objects including packages.
 *
 ******************************************************************************/

ACPI_STATUS
acpi_cm_get_package_object_size (
	ACPI_OPERAND_OBJECT     *internal_object,
	u32                     *obj_length)
{
	ACPI_STATUS             status;
	ACPI_PKG_INFO           info;


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

	status = acpi_cm_walk_package_tree (internal_object, NULL,
			 acpi_cm_get_element_length, &info);

	/*
	 * 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 += ROUND_UP_TO_NATIVE_WORD (sizeof (ACPI_OBJECT)) *
			  info.num_packages;

	/* Return the total package length */

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


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_get_object_size
 *
 * PARAMETERS:  *Internal_object    - Pointer to the object we are examining
 *              *Ret_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_cm_get_object_size(
	ACPI_OPERAND_OBJECT     *internal_object,
	u32                     *obj_length)
{
	ACPI_STATUS             status;


	if ((VALID_DESCRIPTOR_TYPE (internal_object, ACPI_DESC_TYPE_INTERNAL)) &&
		(IS_THIS_OBJECT_TYPE (internal_object, ACPI_TYPE_PACKAGE))) {
		status = acpi_cm_get_package_object_size (internal_object, obj_length);
	}

	else {
		status = acpi_cm_get_simple_object_size (internal_object, obj_length);
	}

	return (status);
}