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

 *

 * Module Name: exresnte - AML Interpreter object resolution

 *

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

/*

 * Copyright (C) 2000 - 2015, Intel Corp.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#include 

#include "accommon.h"

#include "acdispat.h"

#include "acinterp.h"

#include "acnamesp.h"

#define _COMPONENT          ACPI_EXECUTER

ACPI_MODULE_NAME("exresnte")

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

 *

 * FUNCTION:    acpi_ex_resolve_node_to_value

 *

 * PARAMETERS:  object_ptr      - Pointer to a location that contains

 *                                a pointer to a NS node, and will receive a

 *                                pointer to the resolved object.

 *              walk_state      - Current state. Valid only if executing AML

 *                                code. NULL if simply resolving an object

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Resolve a Namespace node to a valued object

 *

 * Note: for some of the data types, the pointer attached to the Node

 * can be either a pointer to an actual internal object or a pointer into the

 * AML stream itself. These types are currently:

 *

 *      ACPI_TYPE_INTEGER

 *      ACPI_TYPE_STRING

 *      ACPI_TYPE_BUFFER

 *      ACPI_TYPE_MUTEX

 *      ACPI_TYPE_PACKAGE

 *

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

acpi_status

acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,

			      struct acpi_walk_state *walk_state)

{

	acpi_status status = AE_OK;

	union acpi_operand_object *source_desc;

	union acpi_operand_object *obj_desc = NULL;

	struct acpi_namespace_node *node;

	acpi_object_type entry_type;

	ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);

	/*

	 * The stack pointer points to a struct acpi_namespace_node (Node). Get the

	 * object that is attached to the Node.

	 */

	node = *object_ptr;

	source_desc = acpi_ns_get_attached_object(node);

	entry_type = acpi_ns_get_type((acpi_handle) node);

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",

			  node, source_desc,

			  acpi_ut_get_type_name(entry_type)));

	if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||

	    (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {

		/* There is always exactly one level of indirection */

		node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);

		source_desc = acpi_ns_get_attached_object(node);

		entry_type = acpi_ns_get_type((acpi_handle) node);

		*object_ptr = node;

	}

	/*

	 * Several object types require no further processing:

	 * 1) Device/Thermal objects don't have a "real" subobject, return the Node

	 * 2) Method locals and arguments have a pseudo-Node

	 * 3) 10/2007: Added method type to assist with Package construction.

	 */

	if ((entry_type == ACPI_TYPE_DEVICE) ||

	    (entry_type == ACPI_TYPE_THERMAL) ||

	    (entry_type == ACPI_TYPE_METHOD) ||

	    (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {

		return_ACPI_STATUS(AE_OK);

	}

	if (!source_desc) {

		ACPI_ERROR((AE_INFO, "No object attached to node [%4.4s] %p",

			    node->name.ascii, node));

		return_ACPI_STATUS(AE_AML_UNINITIALIZED_NODE);

	}

	/*

	 * Action is based on the type of the Node, which indicates the type

	 * of the attached object or pointer

	 */

	switch (entry_type) {

	case ACPI_TYPE_PACKAGE:

		if (source_desc->common.type != ACPI_TYPE_PACKAGE) {

			ACPI_ERROR((AE_INFO, "Object not a Package, type %s",

				    acpi_ut_get_object_type_name(source_desc)));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);

		}

		status = acpi_ds_get_package_arguments(source_desc);

		if (ACPI_SUCCESS(status)) {

			/* Return an additional reference to the object */

			obj_desc = source_desc;

			acpi_ut_add_reference(obj_desc);

		}

		break;

	case ACPI_TYPE_BUFFER:

		if (source_desc->common.type != ACPI_TYPE_BUFFER) {

			ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",

				    acpi_ut_get_object_type_name(source_desc)));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);

		}

		status = acpi_ds_get_buffer_arguments(source_desc);

		if (ACPI_SUCCESS(status)) {

			/* Return an additional reference to the object */

			obj_desc = source_desc;

			acpi_ut_add_reference(obj_desc);

		}

		break;

	case ACPI_TYPE_STRING:

		if (source_desc->common.type != ACPI_TYPE_STRING) {

			ACPI_ERROR((AE_INFO, "Object not a String, type %s",

				    acpi_ut_get_object_type_name(source_desc)));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);

		}

		/* Return an additional reference to the object */

		obj_desc = source_desc;

		acpi_ut_add_reference(obj_desc);

		break;

	case ACPI_TYPE_INTEGER:

		if (source_desc->common.type != ACPI_TYPE_INTEGER) {

			ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",

				    acpi_ut_get_object_type_name(source_desc)));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);

		}

		/* Return an additional reference to the object */

		obj_desc = source_desc;

		acpi_ut_add_reference(obj_desc);

		break;

	case ACPI_TYPE_BUFFER_FIELD:

	case ACPI_TYPE_LOCAL_REGION_FIELD:

	case ACPI_TYPE_LOCAL_BANK_FIELD:

	case ACPI_TYPE_LOCAL_INDEX_FIELD:

		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,

				  "FieldRead Node=%p SourceDesc=%p Type=%X\n",

				  node, source_desc, entry_type));

		status =

		    acpi_ex_read_data_from_field(walk_state, source_desc,

						 &obj_desc);

		break;

		/* For these objects, just return the object attached to the Node */

	case ACPI_TYPE_MUTEX:

	case ACPI_TYPE_POWER:

	case ACPI_TYPE_PROCESSOR:

	case ACPI_TYPE_EVENT:

	case ACPI_TYPE_REGION:

		/* Return an additional reference to the object */

		obj_desc = source_desc;

		acpi_ut_add_reference(obj_desc);

		break;

		/* TYPE_ANY is untyped, and thus there is no object associated with it */

	case ACPI_TYPE_ANY:

		ACPI_ERROR((AE_INFO,

			    "Untyped entry %p, no attached object!", node));

		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);	/* Cannot be AE_TYPE */

	case ACPI_TYPE_LOCAL_REFERENCE:

		switch (source_desc->reference.class) {

		case ACPI_REFCLASS_TABLE:	/* This is a ddb_handle */

		case ACPI_REFCLASS_REFOF:

		case ACPI_REFCLASS_INDEX:

			/* Return an additional reference to the object */

			obj_desc = source_desc;

			acpi_ut_add_reference(obj_desc);

			break;

		default:

			/* No named references are allowed here */

			ACPI_ERROR((AE_INFO,

				    "Unsupported Reference type 0x%X",

				    source_desc->reference.class));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);

		}

		break;

	default:

		/* Default case is for unknown types */

		ACPI_ERROR((AE_INFO,

			    "Node %p - Unknown object type 0x%X",

			    node, entry_type));

		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);

	}			/* switch (entry_type) */

	/* Return the object descriptor */

	*object_ptr = (void *)obj_desc;

	return_ACPI_STATUS(status);

}