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

/******************************************************************************
 *
 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2006, R. Byron Moore
 * 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/acinterp.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>
#include <acpi/acevents.h>
#include <acpi/actables.h>
#include <acpi/acdispat.h>

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exconfig")

/* Local prototypes */
static acpi_status
acpi_ex_add_table(struct acpi_table_header *table,
		  struct acpi_namespace_node *parent_node,
		  union acpi_operand_object **ddb_handle);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_add_table
 *
 * PARAMETERS:  Table               - Pointer to raw table
 *              parent_node         - Where to load the table (scope)
 *              ddb_handle          - Where to return the table handle.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Common function to Install and Load an ACPI table with a
 *              returned table handle.
 *
 ******************************************************************************/

static acpi_status
acpi_ex_add_table(struct acpi_table_header *table,
		  struct acpi_namespace_node *parent_node,
		  union acpi_operand_object **ddb_handle)
{
	acpi_status status;
	struct acpi_table_desc table_info;
	union acpi_operand_object *obj_desc;

	ACPI_FUNCTION_TRACE("ex_add_table");

	/* Create an object to be the table handle */

	obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
	if (!obj_desc) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Init the table handle */

	obj_desc->reference.opcode = AML_LOAD_OP;
	*ddb_handle = obj_desc;

	/* Install the new table into the local data structures */

	ACPI_MEMSET(&table_info, 0, sizeof(struct acpi_table_desc));

	table_info.type = ACPI_TABLE_SSDT;
	table_info.pointer = table;
	table_info.length = (acpi_size) table->length;
	table_info.allocation = ACPI_MEM_ALLOCATED;

	status = acpi_tb_install_table(&table_info);
	obj_desc->reference.object = table_info.installed_desc;

	if (ACPI_FAILURE(status)) {
		if (status == AE_ALREADY_EXISTS) {
			/* Table already exists, just return the handle */

			return_ACPI_STATUS(AE_OK);
		}
		goto cleanup;
	}

	/* Add the table to the namespace */

	status = acpi_ns_load_table(table_info.installed_desc, parent_node);
	if (ACPI_FAILURE(status)) {
		/* Uninstall table on error */

		(void)acpi_tb_uninstall_table(table_info.installed_desc);
		goto cleanup;
	}

	return_ACPI_STATUS(AE_OK);

      cleanup:
	acpi_ut_remove_reference(obj_desc);
	*ddb_handle = NULL;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_load_table_op
 *
 * PARAMETERS:  walk_state          - Current state with operands
 *              return_desc         - Where to store the return object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load an ACPI table
 *
 ******************************************************************************/

acpi_status
acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
		      union acpi_operand_object **return_desc)
{
	acpi_status status;
	union acpi_operand_object **operand = &walk_state->operands[0];
	struct acpi_table_header *table;
	struct acpi_namespace_node *parent_node;
	struct acpi_namespace_node *start_node;
	struct acpi_namespace_node *parameter_node = NULL;
	union acpi_operand_object *ddb_handle;

	ACPI_FUNCTION_TRACE("ex_load_table_op");

#if 0
	/*
	 * Make sure that the signature does not match one of the tables that
	 * is already loaded.
	 */
	status = acpi_tb_match_signature(operand[0]->string.pointer, NULL);
	if (status == AE_OK) {
		/* Signature matched -- don't allow override */

		return_ACPI_STATUS(AE_ALREADY_EXISTS);
	}
#endif

	/* Find the ACPI table */

	status = acpi_tb_find_table(operand[0]->string.pointer,
				    operand[1]->string.pointer,
				    operand[2]->string.pointer, &table);
	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND) {
			return_ACPI_STATUS(status);
		}

		/* Table not found, return an Integer=0 and AE_OK */

		ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
		if (!ddb_handle) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		ddb_handle->integer.value = 0;
		*return_desc = ddb_handle;

		return_ACPI_STATUS(AE_OK);
	}

	/* Default nodes */

	start_node = walk_state->scope_info->scope.node;
	parent_node = acpi_gbl_root_node;

	/* root_path (optional parameter) */

	if (operand[3]->string.length > 0) {
		/*
		 * Find the node referenced by the root_path_string. This is the
		 * location within the namespace where the table will be loaded.
		 */
		status =
		    acpi_ns_get_node_by_path(operand[3]->string.pointer,
					     start_node, ACPI_NS_SEARCH_PARENT,
					     &parent_node);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* parameter_path (optional parameter) */

	if (operand[4]->string.length > 0) {
		if ((operand[4]->string.pointer[0] != '\\') &&
		    (operand[4]->string.pointer[0] != '^')) {
			/*
			 * Path is not absolute, so it will be relative to the node
			 * referenced by the root_path_string (or the NS root if omitted)
			 */
			start_node = parent_node;
		}

		/* Find the node referenced by the parameter_path_string */

		status =
		    acpi_ns_get_node_by_path(operand[4]->string.pointer,
					     start_node, ACPI_NS_SEARCH_PARENT,
					     &parameter_node);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* Load the table into the namespace */

	status = acpi_ex_add_table(table, parent_node, &ddb_handle);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Parameter Data (optional) */

	if (parameter_node) {
		/* Store the parameter data into the optional parameter object */

		status = acpi_ex_store(operand[5],
				       ACPI_CAST_PTR(union acpi_operand_object,
						     parameter_node),
				       walk_state);
		if (ACPI_FAILURE(status)) {
			(void)acpi_ex_unload_table(ddb_handle);
			return_ACPI_STATUS(status);
		}
	}

	*return_desc = ddb_handle;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_load_op
 *
 * PARAMETERS:  obj_desc        - Region or Field where the table will be
 *                                obtained
 *              Target          - Where a handle to the table will be stored
 *              walk_state      - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load an ACPI table from a field or operation region
 *
 ******************************************************************************/

acpi_status
acpi_ex_load_op(union acpi_operand_object *obj_desc,
		union acpi_operand_object *target,
		struct acpi_walk_state *walk_state)
{
	acpi_status status;
	union acpi_operand_object *ddb_handle;
	union acpi_operand_object *buffer_desc = NULL;
	struct acpi_table_header *table_ptr = NULL;
	acpi_physical_address address;
	struct acpi_table_header table_header;
	u32 i;

	ACPI_FUNCTION_TRACE("ex_load_op");

	/* Object can be either an op_region or a Field */

	switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
	case ACPI_TYPE_REGION:

		ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
				  obj_desc,
				  acpi_ut_get_object_type_name(obj_desc)));

		/*
		 * If the Region Address and Length have not been previously evaluated,
		 * evaluate them now and save the results.
		 */
		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
			status = acpi_ds_get_region_arguments(obj_desc);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}

		/* Get the base physical address of the region */

		address = obj_desc->region.address;

		/* Get the table length from the table header */

		table_header.length = 0;
		for (i = 0; i < 8; i++) {
			status =
			    acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
							   (acpi_physical_address)
							   (i + address), 8,
							   ((u8 *) &
							    table_header) + i);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}

		/* Sanity check the table length */

		if (table_header.length < sizeof(struct acpi_table_header)) {
			return_ACPI_STATUS(AE_BAD_HEADER);
		}

		/* Allocate a buffer for the entire table */

		table_ptr = ACPI_MEM_ALLOCATE(table_header.length);
		if (!table_ptr) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Get the entire table from the op region */

		for (i = 0; i < table_header.length; i++) {
			status =
			    acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
							   (acpi_physical_address)
							   (i + address), 8,
							   ((u8 *) table_ptr +
							    i));
			if (ACPI_FAILURE(status)) {
				goto cleanup;
			}
		}
		break;

	case ACPI_TYPE_LOCAL_REGION_FIELD:
	case ACPI_TYPE_LOCAL_BANK_FIELD:
	case ACPI_TYPE_LOCAL_INDEX_FIELD:

		ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Field %p %s\n",
				  obj_desc,
				  acpi_ut_get_object_type_name(obj_desc)));

		/*
		 * The length of the field must be at least as large as the table.
		 * Read the entire field and thus the entire table.  Buffer is
		 * allocated during the read.
		 */
		status =
		    acpi_ex_read_data_from_field(walk_state, obj_desc,
						 &buffer_desc);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		table_ptr = ACPI_CAST_PTR(struct acpi_table_header,
					  buffer_desc->buffer.pointer);

		/* All done with the buffer_desc, delete it */

		buffer_desc->buffer.pointer = NULL;
		acpi_ut_remove_reference(buffer_desc);

		/* Sanity check the table length */

		if (table_ptr->length < sizeof(struct acpi_table_header)) {
			status = AE_BAD_HEADER;
			goto cleanup;
		}
		break;

	default:
		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	/* The table must be either an SSDT or a PSDT */

	if ((!ACPI_STRNCMP(table_ptr->signature,
			   acpi_gbl_table_data[ACPI_TABLE_PSDT].signature,
			   acpi_gbl_table_data[ACPI_TABLE_PSDT].sig_length)) &&
	    (!ACPI_STRNCMP(table_ptr->signature,
			   acpi_gbl_table_data[ACPI_TABLE_SSDT].signature,
			   acpi_gbl_table_data[ACPI_TABLE_SSDT].sig_length))) {
		ACPI_ERROR((AE_INFO,
			    "Table has invalid signature [%4.4s], must be SSDT or PSDT",
			    table_ptr->signature));
		status = AE_BAD_SIGNATURE;
		goto cleanup;
	}

	/* Install the new table into the local data structures */

	status = acpi_ex_add_table(table_ptr, acpi_gbl_root_node, &ddb_handle);
	if (ACPI_FAILURE(status)) {
		/* On error, table_ptr was deallocated above */

		return_ACPI_STATUS(status);
	}

	/* Store the ddb_handle into the Target operand */

	status = acpi_ex_store(ddb_handle, target, walk_state);
	if (ACPI_FAILURE(status)) {
		(void)acpi_ex_unload_table(ddb_handle);

		/* table_ptr was deallocated above */

		return_ACPI_STATUS(status);
	}

      cleanup:
	if (ACPI_FAILURE(status)) {
		ACPI_MEM_FREE(table_ptr);
	}
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_unload_table
 *
 * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Unload an ACPI table
 *
 ******************************************************************************/

acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *table_desc = ddb_handle;
	struct acpi_table_desc *table_info;

	ACPI_FUNCTION_TRACE("ex_unload_table");

	/*
	 * Validate the handle
	 * Although the handle is partially validated in acpi_ex_reconfiguration(),
	 * when it calls acpi_ex_resolve_operands(), the handle is more completely
	 * validated here.
	 */
	if ((!ddb_handle) ||
	    (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
	    (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Get the actual table descriptor from the ddb_handle */

	table_info = (struct acpi_table_desc *)table_desc->reference.object;

	/*
	 * Delete the entire namespace under this table Node
	 * (Offset contains the table_id)
	 */
	acpi_ns_delete_namespace_by_owner(table_info->owner_id);
	acpi_ut_release_owner_id(&table_info->owner_id);

	/* Delete the table itself */

	(void)acpi_tb_uninstall_table(table_info->installed_desc);

	/* Delete the table descriptor (ddb_handle) */

	acpi_ut_remove_reference(table_desc);
	return_ACPI_STATUS(status);
}
Commit	Line	Data
1da177e4 LT	1	/******************************************************************************
	2	*
	3	* Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
	4	*
	5	*****************************************************************************/
	6
	7	/*
4a90c7e8	8	* Copyright (C) 2000 - 2006, R. Byron Moore
1da177e4 LT	9	* All rights reserved.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions, and the following disclaimer,
	16	* without modification.
	17	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	18	* substantially similar to the "NO WARRANTY" disclaimer below
	19	* ("Disclaimer") and any redistribution must be conditioned upon
	20	* including a substantially similar Disclaimer requirement for further
	21	* binary redistribution.
	22	* 3. Neither the names of the above-listed copyright holders nor the names
	23	* of any contributors may be used to endorse or promote products derived
	24	* from this software without specific prior written permission.
	25	*
	26	* Alternatively, this software may be distributed under the terms of the
	27	* GNU General Public License ("GPL") version 2 as published by the Free
	28	* Software Foundation.
	29	*
	30	* NO WARRANTY
	31	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	32	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	33	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	34	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	35	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	36	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	37	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	38	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	39	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	40	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	41	* POSSIBILITY OF SUCH DAMAGES.
	42	*/
	43
1da177e4 LT	44	#include <acpi/acpi.h>
	45	#include <acpi/acinterp.h>
	46	#include <acpi/amlcode.h>
	47	#include <acpi/acnamesp.h>
	48	#include <acpi/acevents.h>
	49	#include <acpi/actables.h>
	50	#include <acpi/acdispat.h>
	51
1da177e4	52	#define _COMPONENT ACPI_EXECUTER
4be44fcd	53	ACPI_MODULE_NAME("exconfig")
1da177e4	54
44f6c012	55	/* Local prototypes */
44f6c012	56	static acpi_status
4be44fcd LB	57	acpi_ex_add_table(struct acpi_table_header *table,
	58	struct acpi_namespace_node *parent_node,
	59	union acpi_operand_object **ddb_handle);
1da177e4 LT	60
	61	/*******************************************************************************
	62	*
	63	* FUNCTION: acpi_ex_add_table
	64	*
	65	* PARAMETERS: Table - Pointer to raw table
	66	* parent_node - Where to load the table (scope)
	67	* ddb_handle - Where to return the table handle.
	68	*
	69	* RETURN: Status
	70	*
	71	* DESCRIPTION: Common function to Install and Load an ACPI table with a
	72	* returned table handle.
	73	*
	74	******************************************************************************/
	75
44f6c012	76	static acpi_status
4be44fcd LB	77	acpi_ex_add_table(struct acpi_table_header *table,
	78	struct acpi_namespace_node *parent_node,
	79	union acpi_operand_object **ddb_handle)
1da177e4	80	{
4be44fcd LB	81	acpi_status status;
	82	struct acpi_table_desc table_info;
	83	union acpi_operand_object *obj_desc;
1da177e4	84
4be44fcd	85	ACPI_FUNCTION_TRACE("ex_add_table");
1da177e4 LT	86
	87	/* Create an object to be the table handle */
	88
4be44fcd	89	obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
1da177e4	90	if (!obj_desc) {
4be44fcd	91	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	92	}
1da177e4 LT	93
0c9938cc RM	94	/* Init the table handle */
	95
	96	obj_desc->reference.opcode = AML_LOAD_OP;
	97	*ddb_handle = obj_desc;
	98
1da177e4 LT	99	/* Install the new table into the local data structures */
1da177e4 LT	100
4be44fcd	101	ACPI_MEMSET(&table_info, 0, sizeof(struct acpi_table_desc));
1da177e4	102
4be44fcd LB	103	table_info.type = ACPI_TABLE_SSDT;
	104	table_info.pointer = table;
	105	table_info.length = (acpi_size) table->length;
44f6c012	106	table_info.allocation = ACPI_MEM_ALLOCATED;
1da177e4	107
4be44fcd	108	status = acpi_tb_install_table(&table_info);
0c9938cc RM	109	obj_desc->reference.object = table_info.installed_desc;
0c9938cc RM	110
4be44fcd	111	if (ACPI_FAILURE(status)) {
0c9938cc RM	112	if (status == AE_ALREADY_EXISTS) {
	113	/* Table already exists, just return the handle */
	114
4be44fcd	115	return_ACPI_STATUS(AE_OK);
0c9938cc	116	}
1da177e4 LT	117	goto cleanup;
	118	}
	119
	120	/* Add the table to the namespace */
	121
4be44fcd LB	122	status = acpi_ns_load_table(table_info.installed_desc, parent_node);
4be44fcd LB	123	if (ACPI_FAILURE(status)) {
1da177e4 LT	124	/* Uninstall table on error */
1da177e4 LT	125
4be44fcd	126	(void)acpi_tb_uninstall_table(table_info.installed_desc);
1da177e4 LT	127	goto cleanup;
	128	}
	129
4be44fcd	130	return_ACPI_STATUS(AE_OK);
1da177e4	131
4be44fcd LB	132	cleanup:
4be44fcd LB	133	acpi_ut_remove_reference(obj_desc);
0c9938cc	134	*ddb_handle = NULL;
4be44fcd	135	return_ACPI_STATUS(status);
1da177e4 LT	136	}
1da177e4 LT	137
1da177e4 LT	138	/*******************************************************************************
	139	*
	140	* FUNCTION: acpi_ex_load_table_op
	141	*
	142	* PARAMETERS: walk_state - Current state with operands
	143	* return_desc - Where to store the return object
	144	*
	145	* RETURN: Status
	146	*
	147	* DESCRIPTION: Load an ACPI table
	148	*
	149	******************************************************************************/
	150
	151	acpi_status
4be44fcd LB	152	acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
4be44fcd LB	153	union acpi_operand_object **return_desc)
1da177e4	154	{
4be44fcd LB	155	acpi_status status;
	156	union acpi_operand_object **operand = &walk_state->operands[0];
	157	struct acpi_table_header *table;
	158	struct acpi_namespace_node *parent_node;
	159	struct acpi_namespace_node *start_node;
	160	struct acpi_namespace_node *parameter_node = NULL;
	161	union acpi_operand_object *ddb_handle;
1da177e4	162
4be44fcd	163	ACPI_FUNCTION_TRACE("ex_load_table_op");
1da177e4 LT	164
	165	#if 0
	166	/*
	167	* Make sure that the signature does not match one of the tables that
	168	* is already loaded.
	169	*/
4be44fcd	170	status = acpi_tb_match_signature(operand[0]->string.pointer, NULL);
1da177e4 LT	171	if (status == AE_OK) {
	172	/* Signature matched -- don't allow override */
	173
4be44fcd	174	return_ACPI_STATUS(AE_ALREADY_EXISTS);
1da177e4 LT	175	}
	176	#endif
	177
	178	/* Find the ACPI table */
	179
4be44fcd LB	180	status = acpi_tb_find_table(operand[0]->string.pointer,
	181	operand[1]->string.pointer,
	182	operand[2]->string.pointer, &table);
	183	if (ACPI_FAILURE(status)) {
1da177e4	184	if (status != AE_NOT_FOUND) {
4be44fcd	185	return_ACPI_STATUS(status);
1da177e4 LT	186	}
	187
	188	/* Table not found, return an Integer=0 and AE_OK */
	189
4be44fcd	190	ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
1da177e4	191	if (!ddb_handle) {
4be44fcd	192	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	193	}
	194
	195	ddb_handle->integer.value = 0;
	196	*return_desc = ddb_handle;
	197
4be44fcd	198	return_ACPI_STATUS(AE_OK);
1da177e4 LT	199	}
	200
	201	/* Default nodes */
	202
	203	start_node = walk_state->scope_info->scope.node;
	204	parent_node = acpi_gbl_root_node;
	205
	206	/* root_path (optional parameter) */
	207
	208	if (operand[3]->string.length > 0) {
	209	/*
	210	* Find the node referenced by the root_path_string. This is the
	211	* location within the namespace where the table will be loaded.
	212	*/
4be44fcd LB	213	status =
	214	acpi_ns_get_node_by_path(operand[3]->string.pointer,
	215	start_node, ACPI_NS_SEARCH_PARENT,
	216	&parent_node);
	217	if (ACPI_FAILURE(status)) {
	218	return_ACPI_STATUS(status);
1da177e4 LT	219	}
	220	}
	221
	222	/* parameter_path (optional parameter) */
	223
	224	if (operand[4]->string.length > 0) {
	225	if ((operand[4]->string.pointer[0] != '\\') &&
4be44fcd	226	(operand[4]->string.pointer[0] != '^')) {
1da177e4 LT	227	/*
	228	* Path is not absolute, so it will be relative to the node
	229	* referenced by the root_path_string (or the NS root if omitted)
	230	*/
	231	start_node = parent_node;
	232	}
	233
44f6c012 RM	234	/* Find the node referenced by the parameter_path_string */
44f6c012 RM	235
4be44fcd LB	236	status =
	237	acpi_ns_get_node_by_path(operand[4]->string.pointer,
	238	start_node, ACPI_NS_SEARCH_PARENT,
	239	&parameter_node);
	240	if (ACPI_FAILURE(status)) {
	241	return_ACPI_STATUS(status);
1da177e4 LT	242	}
	243	}
	244
	245	/* Load the table into the namespace */
	246
4be44fcd LB	247	status = acpi_ex_add_table(table, parent_node, &ddb_handle);
	248	if (ACPI_FAILURE(status)) {
	249	return_ACPI_STATUS(status);
1da177e4 LT	250	}
	251
	252	/* Parameter Data (optional) */
	253
	254	if (parameter_node) {
	255	/* Store the parameter data into the optional parameter object */
	256
4be44fcd LB	257	status = acpi_ex_store(operand[5],
	258	ACPI_CAST_PTR(union acpi_operand_object,
	259	parameter_node),
	260	walk_state);
	261	if (ACPI_FAILURE(status)) {
	262	(void)acpi_ex_unload_table(ddb_handle);
	263	return_ACPI_STATUS(status);
1da177e4 LT	264	}
	265	}
	266
	267	*return_desc = ddb_handle;
4be44fcd	268	return_ACPI_STATUS(status);
1da177e4 LT	269	}
1da177e4 LT	270
1da177e4 LT	271	/*******************************************************************************
	272	*
	273	* FUNCTION: acpi_ex_load_op
	274	*
	275	* PARAMETERS: obj_desc - Region or Field where the table will be
	276	* obtained
	277	* Target - Where a handle to the table will be stored
	278	* walk_state - Current state
	279	*
	280	* RETURN: Status
	281	*
	282	* DESCRIPTION: Load an ACPI table from a field or operation region
	283	*
	284	******************************************************************************/
	285
	286	acpi_status
4be44fcd LB	287	acpi_ex_load_op(union acpi_operand_object *obj_desc,
	288	union acpi_operand_object *target,
	289	struct acpi_walk_state *walk_state)
1da177e4	290	{
4be44fcd LB	291	acpi_status status;
	292	union acpi_operand_object *ddb_handle;
	293	union acpi_operand_object *buffer_desc = NULL;
	294	struct acpi_table_header *table_ptr = NULL;
	295	acpi_physical_address address;
	296	struct acpi_table_header table_header;
	297	u32 i;
1da177e4	298
4be44fcd	299	ACPI_FUNCTION_TRACE("ex_load_op");
1da177e4 LT	300
	301	/* Object can be either an op_region or a Field */
	302
4be44fcd	303	switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
1da177e4 LT	304	case ACPI_TYPE_REGION:
1da177e4 LT	305
4be44fcd LB	306	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
	307	obj_desc,
	308	acpi_ut_get_object_type_name(obj_desc)));
1da177e4 LT	309
	310	/*
	311	* If the Region Address and Length have not been previously evaluated,
	312	* evaluate them now and save the results.
	313	*/
	314	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
4be44fcd LB	315	status = acpi_ds_get_region_arguments(obj_desc);
	316	if (ACPI_FAILURE(status)) {
	317	return_ACPI_STATUS(status);
1da177e4 LT	318	}
	319	}
	320
	321	/* Get the base physical address of the region */
	322
	323	address = obj_desc->region.address;
	324
	325	/* Get the table length from the table header */
	326
	327	table_header.length = 0;
	328	for (i = 0; i < 8; i++) {
4be44fcd LB	329	status =
	330	acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
	331	(acpi_physical_address)
	332	(i + address), 8,
	333	((u8 *) &
	334	table_header) + i);
	335	if (ACPI_FAILURE(status)) {
	336	return_ACPI_STATUS(status);
1da177e4 LT	337	}
	338	}
	339
	340	/* Sanity check the table length */
	341
4be44fcd LB	342	if (table_header.length < sizeof(struct acpi_table_header)) {
4be44fcd LB	343	return_ACPI_STATUS(AE_BAD_HEADER);
1da177e4 LT	344	}
	345
	346	/* Allocate a buffer for the entire table */
	347
4be44fcd	348	table_ptr = ACPI_MEM_ALLOCATE(table_header.length);
1da177e4	349	if (!table_ptr) {
4be44fcd	350	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	351	}
	352
	353	/* Get the entire table from the op region */
	354
	355	for (i = 0; i < table_header.length; i++) {
4be44fcd LB	356	status =
	357	acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
	358	(acpi_physical_address)
	359	(i + address), 8,
	360	((u8 *) table_ptr +
	361	i));
	362	if (ACPI_FAILURE(status)) {
1da177e4 LT	363	goto cleanup;
	364	}
	365	}
	366	break;
	367
1da177e4 LT	368	case ACPI_TYPE_LOCAL_REGION_FIELD:
	369	case ACPI_TYPE_LOCAL_BANK_FIELD:
	370	case ACPI_TYPE_LOCAL_INDEX_FIELD:
	371
4be44fcd LB	372	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Field %p %s\n",
	373	obj_desc,
	374	acpi_ut_get_object_type_name(obj_desc)));
1da177e4 LT	375
	376	/*
	377	* The length of the field must be at least as large as the table.
	378	* Read the entire field and thus the entire table. Buffer is
	379	* allocated during the read.
	380	*/
4be44fcd LB	381	status =
	382	acpi_ex_read_data_from_field(walk_state, obj_desc,
	383	&buffer_desc);
	384	if (ACPI_FAILURE(status)) {
	385	return_ACPI_STATUS(status);
1da177e4 LT	386	}
1da177e4 LT	387
4be44fcd LB	388	table_ptr = ACPI_CAST_PTR(struct acpi_table_header,
4be44fcd LB	389	buffer_desc->buffer.pointer);
1da177e4	390
88ac00f5 RM	391	/* All done with the buffer_desc, delete it */
	392
	393	buffer_desc->buffer.pointer = NULL;
4be44fcd	394	acpi_ut_remove_reference(buffer_desc);
88ac00f5 RM	395
88ac00f5 RM	396	/* Sanity check the table length */
1da177e4	397
4be44fcd	398	if (table_ptr->length < sizeof(struct acpi_table_header)) {
88ac00f5 RM	399	status = AE_BAD_HEADER;
88ac00f5 RM	400	goto cleanup;
1da177e4 LT	401	}
	402	break;
	403
1da177e4	404	default:
4be44fcd	405	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	406	}
	407
	408	/* The table must be either an SSDT or a PSDT */
	409
4be44fcd LB	410	if ((!ACPI_STRNCMP(table_ptr->signature,
	411	acpi_gbl_table_data[ACPI_TABLE_PSDT].signature,
	412	acpi_gbl_table_data[ACPI_TABLE_PSDT].sig_length)) &&
	413	(!ACPI_STRNCMP(table_ptr->signature,
	414	acpi_gbl_table_data[ACPI_TABLE_SSDT].signature,
	415	acpi_gbl_table_data[ACPI_TABLE_SSDT].sig_length))) {
b8e4d893 BM	416	ACPI_ERROR((AE_INFO,
	417	"Table has invalid signature [%4.4s], must be SSDT or PSDT",
	418	table_ptr->signature));
1da177e4 LT	419	status = AE_BAD_SIGNATURE;
	420	goto cleanup;
	421	}
	422
	423	/* Install the new table into the local data structures */
	424
4be44fcd LB	425	status = acpi_ex_add_table(table_ptr, acpi_gbl_root_node, &ddb_handle);
4be44fcd LB	426	if (ACPI_FAILURE(status)) {
88ac00f5 RM	427	/* On error, table_ptr was deallocated above */
88ac00f5 RM	428
4be44fcd	429	return_ACPI_STATUS(status);
1da177e4 LT	430	}
	431
	432	/* Store the ddb_handle into the Target operand */
	433
4be44fcd LB	434	status = acpi_ex_store(ddb_handle, target, walk_state);
	435	if (ACPI_FAILURE(status)) {
	436	(void)acpi_ex_unload_table(ddb_handle);
1da177e4	437
88ac00f5	438	/* table_ptr was deallocated above */
1da177e4	439
4be44fcd	440	return_ACPI_STATUS(status);
88ac00f5	441	}
1da177e4	442
4be44fcd LB	443	cleanup:
	444	if (ACPI_FAILURE(status)) {
	445	ACPI_MEM_FREE(table_ptr);
1da177e4	446	}
4be44fcd	447	return_ACPI_STATUS(status);
1da177e4 LT	448	}
1da177e4 LT	449
1da177e4 LT	450	/*******************************************************************************
	451	*
	452	* FUNCTION: acpi_ex_unload_table
	453	*
	454	* PARAMETERS: ddb_handle - Handle to a previously loaded table
	455	*
	456	* RETURN: Status
	457	*
	458	* DESCRIPTION: Unload an ACPI table
	459	*
	460	******************************************************************************/
	461
4be44fcd	462	acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
1da177e4	463	{
4be44fcd LB	464	acpi_status status = AE_OK;
	465	union acpi_operand_object *table_desc = ddb_handle;
	466	struct acpi_table_desc *table_info;
1da177e4	467
4be44fcd	468	ACPI_FUNCTION_TRACE("ex_unload_table");
1da177e4 LT	469
	470	/*
	471	* Validate the handle
	472	* Although the handle is partially validated in acpi_ex_reconfiguration(),
	473	* when it calls acpi_ex_resolve_operands(), the handle is more completely
	474	* validated here.
	475	*/
	476	if ((!ddb_handle) \|\|
4be44fcd LB	477	(ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) \|\|
	478	(ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
	479	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	480	}
	481
	482	/* Get the actual table descriptor from the ddb_handle */
	483
4be44fcd	484	table_info = (struct acpi_table_desc *)table_desc->reference.object;
1da177e4 LT	485
	486	/*
	487	* Delete the entire namespace under this table Node
	488	* (Offset contains the table_id)
	489	*/
4be44fcd LB	490	acpi_ns_delete_namespace_by_owner(table_info->owner_id);
4be44fcd LB	491	acpi_ut_release_owner_id(&table_info->owner_id);
1da177e4 LT	492
	493	/* Delete the table itself */
	494
4be44fcd	495	(void)acpi_tb_uninstall_table(table_info->installed_desc);
1da177e4 LT	496
	497	/* Delete the table descriptor (ddb_handle) */
	498
4be44fcd LB	499	acpi_ut_remove_reference(table_desc);
4be44fcd LB	500	return_ACPI_STATUS(status);
1da177e4	501	}