[deliverable/linux.git] / drivers / acpi / executer / exresnte.c


/******************************************************************************
 *
 * Module Name: exresnte - AML Interpreter object resolution
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2008, 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 <acpi/acpi.h>
#include <acpi/accommon.h>
#include <acpi/acdispat.h>
#include <acpi/acinterp.h>
#include <acpi/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 %p", node));
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}

	/*
	 * 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 (ACPI_GET_OBJECT_TYPE(source_desc) != 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 (ACPI_GET_OBJECT_TYPE(source_desc) != 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 (ACPI_GET_OBJECT_TYPE(source_desc) != 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 (ACPI_GET_OBJECT_TYPE(source_desc) != 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 %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 %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);
}
Commit	Line	Data
1da177e4 LT	1
	2	/******************************************************************************
	3	*
	4	* Module Name: exresnte - AML Interpreter object resolution
	5	*
	6	*****************************************************************************/
	7
	8	/*
75a44ce0	9	* Copyright (C) 2000 - 2008, Intel Corp.
1da177e4 LT	10	* All rights reserved.
	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions
	14	* are met:
	15	* 1. Redistributions of source code must retain the above copyright
	16	* notice, this list of conditions, and the following disclaimer,
	17	* without modification.
	18	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	19	* substantially similar to the "NO WARRANTY" disclaimer below
	20	* ("Disclaimer") and any redistribution must be conditioned upon
	21	* including a substantially similar Disclaimer requirement for further
	22	* binary redistribution.
	23	* 3. Neither the names of the above-listed copyright holders nor the names
	24	* of any contributors may be used to endorse or promote products derived
	25	* from this software without specific prior written permission.
	26	*
	27	* Alternatively, this software may be distributed under the terms of the
	28	* GNU General Public License ("GPL") version 2 as published by the Free
	29	* Software Foundation.
	30	*
	31	* NO WARRANTY
	32	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	33	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	34	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	35	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	36	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	37	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	38	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	39	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	40	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	41	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	42	* POSSIBILITY OF SUCH DAMAGES.
	43	*/
	44
1da177e4	45	#include <acpi/acpi.h>
50df4d8b	46	#include <acpi/accommon.h>
1da177e4 LT	47	#include <acpi/acdispat.h>
	48	#include <acpi/acinterp.h>
	49	#include <acpi/acnamesp.h>
1da177e4	50
1da177e4	51	#define _COMPONENT ACPI_EXECUTER
4be44fcd	52	ACPI_MODULE_NAME("exresnte")
1da177e4 LT	53
	54	/*******************************************************************************
	55	*
	56	* FUNCTION: acpi_ex_resolve_node_to_value
	57	*
	58	* PARAMETERS: object_ptr - Pointer to a location that contains
	59	* a pointer to a NS node, and will receive a
	60	* pointer to the resolved object.
	61	* walk_state - Current state. Valid only if executing AML
	62	* code. NULL if simply resolving an object
	63	*
	64	* RETURN: Status
	65	*
	66	* DESCRIPTION: Resolve a Namespace node to a valued object
	67	*
	68	* Note: for some of the data types, the pointer attached to the Node
	69	* can be either a pointer to an actual internal object or a pointer into the
	70	* AML stream itself. These types are currently:
	71	*
	72	* ACPI_TYPE_INTEGER
	73	* ACPI_TYPE_STRING
	74	* ACPI_TYPE_BUFFER
	75	* ACPI_TYPE_MUTEX
	76	* ACPI_TYPE_PACKAGE
	77	*
	78	******************************************************************************/
1da177e4	79	acpi_status
4be44fcd LB	80	acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,
4be44fcd LB	81	struct acpi_walk_state *walk_state)
1da177e4	82	{
4be44fcd LB	83	acpi_status status = AE_OK;
	84	union acpi_operand_object *source_desc;
	85	union acpi_operand_object *obj_desc = NULL;
	86	struct acpi_namespace_node *node;
	87	acpi_object_type entry_type;
1da177e4	88
b229cf92	89	ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);
1da177e4 LT	90
	91	/*
	92	* The stack pointer points to a struct acpi_namespace_node (Node). Get the
	93	* object that is attached to the Node.
	94	*/
4be44fcd LB	95	node = *object_ptr;
	96	source_desc = acpi_ns_get_attached_object(node);
	97	entry_type = acpi_ns_get_type((acpi_handle) node);
1da177e4	98
b229cf92	99	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
4be44fcd LB	100	node, source_desc,
4be44fcd LB	101	acpi_ut_get_type_name(entry_type)));
1da177e4 LT	102
1da177e4 LT	103	if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) \|\|
4be44fcd	104	(entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
52fc0b02	105
1da177e4 LT	106	/* There is always exactly one level of indirection */
1da177e4 LT	107
4be44fcd LB	108	node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
	109	source_desc = acpi_ns_get_attached_object(node);
	110	entry_type = acpi_ns_get_type((acpi_handle) node);
1da177e4 LT	111	*object_ptr = node;
	112	}
	113
	114	/*
	115	* Several object types require no further processing:
4c90ece2	116	* 1) Device/Thermal objects don't have a "real" subobject, return the Node
1da177e4	117	* 2) Method locals and arguments have a pseudo-Node
b160987d	118	* 3) 10/2007: Added method type to assist with Package construction.
1da177e4	119	*/
4c90ece2 BM	120	if ((entry_type == ACPI_TYPE_DEVICE) \|\|
4c90ece2 BM	121	(entry_type == ACPI_TYPE_THERMAL) \|\|
b160987d	122	(entry_type == ACPI_TYPE_METHOD) \|\|
4be44fcd LB	123	(node->flags & (ANOBJ_METHOD_ARG \| ANOBJ_METHOD_LOCAL))) {
4be44fcd LB	124	return_ACPI_STATUS(AE_OK);
1da177e4 LT	125	}
	126
	127	if (!source_desc) {
b8e4d893	128	ACPI_ERROR((AE_INFO, "No object attached to node %p", node));
4be44fcd	129	return_ACPI_STATUS(AE_AML_NO_OPERAND);
1da177e4 LT	130	}
	131
	132	/*
	133	* Action is based on the type of the Node, which indicates the type
	134	* of the attached object or pointer
	135	*/
	136	switch (entry_type) {
	137	case ACPI_TYPE_PACKAGE:
	138
4be44fcd	139	if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_PACKAGE) {
b8e4d893 BM	140	ACPI_ERROR((AE_INFO, "Object not a Package, type %s",
b8e4d893 BM	141	acpi_ut_get_object_type_name(source_desc)));
4be44fcd	142	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	143	}
1da177e4 LT	144
4be44fcd LB	145	status = acpi_ds_get_package_arguments(source_desc);
4be44fcd LB	146	if (ACPI_SUCCESS(status)) {
52fc0b02	147
1da177e4 LT	148	/* Return an additional reference to the object */
	149
	150	obj_desc = source_desc;
4be44fcd	151	acpi_ut_add_reference(obj_desc);
1da177e4 LT	152	}
	153	break;
	154
1da177e4 LT	155	case ACPI_TYPE_BUFFER:
1da177e4 LT	156
4be44fcd	157	if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) {
b8e4d893 BM	158	ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",
b8e4d893 BM	159	acpi_ut_get_object_type_name(source_desc)));
4be44fcd	160	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	161	}
1da177e4 LT	162
4be44fcd LB	163	status = acpi_ds_get_buffer_arguments(source_desc);
4be44fcd LB	164	if (ACPI_SUCCESS(status)) {
52fc0b02	165
1da177e4 LT	166	/* Return an additional reference to the object */
	167
	168	obj_desc = source_desc;
4be44fcd	169	acpi_ut_add_reference(obj_desc);
1da177e4 LT	170	}
	171	break;
	172
1da177e4 LT	173	case ACPI_TYPE_STRING:
1da177e4 LT	174
4be44fcd	175	if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) {
b8e4d893 BM	176	ACPI_ERROR((AE_INFO, "Object not a String, type %s",
b8e4d893 BM	177	acpi_ut_get_object_type_name(source_desc)));
4be44fcd	178	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	179	}
	180
	181	/* Return an additional reference to the object */
	182
	183	obj_desc = source_desc;
4be44fcd	184	acpi_ut_add_reference(obj_desc);
1da177e4 LT	185	break;
1da177e4 LT	186
1da177e4 LT	187	case ACPI_TYPE_INTEGER:
1da177e4 LT	188
4be44fcd	189	if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) {
b8e4d893 BM	190	ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",
b8e4d893 BM	191	acpi_ut_get_object_type_name(source_desc)));
4be44fcd	192	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	193	}
	194
	195	/* Return an additional reference to the object */
	196
	197	obj_desc = source_desc;
4be44fcd	198	acpi_ut_add_reference(obj_desc);
1da177e4 LT	199	break;
1da177e4 LT	200
1da177e4 LT	201	case ACPI_TYPE_BUFFER_FIELD:
	202	case ACPI_TYPE_LOCAL_REGION_FIELD:
	203	case ACPI_TYPE_LOCAL_BANK_FIELD:
	204	case ACPI_TYPE_LOCAL_INDEX_FIELD:
	205
4be44fcd	206	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
b229cf92	207	"FieldRead Node=%p SourceDesc=%p Type=%X\n",
4be44fcd	208	node, source_desc, entry_type));
1da177e4	209
4be44fcd LB	210	status =
	211	acpi_ex_read_data_from_field(walk_state, source_desc,
	212	&obj_desc);
1da177e4 LT	213	break;
1da177e4 LT	214
4be44fcd	215	/* For these objects, just return the object attached to the Node */
44f6c012	216
1da177e4	217	case ACPI_TYPE_MUTEX:
1da177e4 LT	218	case ACPI_TYPE_POWER:
1da177e4 LT	219	case ACPI_TYPE_PROCESSOR:
1da177e4 LT	220	case ACPI_TYPE_EVENT:
	221	case ACPI_TYPE_REGION:
	222
	223	/* Return an additional reference to the object */
	224
	225	obj_desc = source_desc;
4be44fcd	226	acpi_ut_add_reference(obj_desc);
1da177e4 LT	227	break;
1da177e4 LT	228
4be44fcd	229	/* TYPE_ANY is untyped, and thus there is no object associated with it */
1da177e4 LT	230
	231	case ACPI_TYPE_ANY:
	232
b8e4d893 BM	233	ACPI_ERROR((AE_INFO,
b8e4d893 BM	234	"Untyped entry %p, no attached object!", node));
1da177e4	235
4be44fcd	236	return_ACPI_STATUS(AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */
1da177e4 LT	237
	238	case ACPI_TYPE_LOCAL_REFERENCE:
	239
1044f1f6 BM	240	switch (source_desc->reference.class) {
	241	case ACPI_REFCLASS_TABLE: /* This is a ddb_handle */
	242	case ACPI_REFCLASS_REFOF:
	243	case ACPI_REFCLASS_INDEX:
1da177e4	244
1da177e4 LT	245	/* Return an additional reference to the object */
	246
	247	obj_desc = source_desc;
4be44fcd	248	acpi_ut_add_reference(obj_desc);
1da177e4 LT	249	break;
	250
	251	default:
	252	/* No named references are allowed here */
	253
b8e4d893	254	ACPI_ERROR((AE_INFO,
1044f1f6 BM	255	"Unsupported Reference type %X",
1044f1f6 BM	256	source_desc->reference.class));
1da177e4	257
4be44fcd	258	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	259	}
	260	break;
	261
1da177e4 LT	262	default:
1da177e4 LT	263
44f6c012 RM	264	/* Default case is for unknown types */
44f6c012 RM	265
b8e4d893 BM	266	ACPI_ERROR((AE_INFO,
	267	"Node %p - Unknown object type %X",
	268	node, entry_type));
1da177e4	269
4be44fcd	270	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4	271
4be44fcd	272	} /* switch (entry_type) */
1da177e4	273
44f6c012	274	/* Return the object descriptor */
1da177e4	275
4be44fcd LB	276	object_ptr = (void )obj_desc;
4be44fcd LB	277	return_ACPI_STATUS(status);
1da177e4	278	}