drivers/acpi/executer/exconfig.c - third_party/linux - Git at Google

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

 /*
  * Copyright (C) 2000 - 2007, 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(acpi_native_uint table_index,
 		  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(acpi_native_uint table_index,
 		  struct acpi_namespace_node *parent_node,
 		  union acpi_operand_object **ddb_handle)
 {
 	acpi_status status;
 	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 */

 	obj_desc->reference.object = ACPI_CAST_PTR(void, table_index);

 	/* Add the table to the namespace */

 	status = acpi_ns_load_table(table_index, parent_node);
 	if (ACPI_FAILURE(status)) {
 		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 from the RSDT/XSDT
  *
  ******************************************************************************/

 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];
 	acpi_native_uint table_index;
 	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;
 	struct acpi_table_header *table;

 	ACPI_FUNCTION_TRACE(ex_load_table_op);

 	/* Find the ACPI table in the RSDT/XSDT */

 	status = acpi_tb_find_table(operand[0]->string.pointer,
 				    operand[1]->string.pointer,
 				    operand[2]->string.pointer, &table_index);
 	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(start_node, operand[3]->string.pointer,
 				     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(start_node, operand[4]->string.pointer,
 				     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_index, 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);
 		}
 	}

 	status = acpi_get_table_by_index(table_index, &table);
 	if (ACPI_SUCCESS(status)) {
 		ACPI_INFO((AE_INFO,
 			   "Dynamic OEM Table Load - [%4.4s] OemId [%6.6s] OemTableId [%8.8s]",
 			   table->signature, table->oem_id,
 			   table->oem_table_id));
 	}

 	*return_desc = ddb_handle;
 	return_ACPI_STATUS(status);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ex_load_op
  *
  * PARAMETERS:  obj_desc        - Region or Buffer/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
  *
  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
  *       objects before this code is reached.
  *
  *       If source is an operation region, it must refer to system_memory, as
  *       per the ACPI specification.
  *
  ******************************************************************************/

 acpi_status
 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 		union acpi_operand_object *target,
 		struct acpi_walk_state *walk_state)
 {
 	union acpi_operand_object *ddb_handle;
 	struct acpi_table_desc table_desc;
 	acpi_native_uint table_index;
 	acpi_status status;

 	ACPI_FUNCTION_TRACE(ex_load_op);

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

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

 	switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 	case ACPI_TYPE_REGION:

 		/* Region must be system_memory (from ACPI spec) */

 		if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 		}

 		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);
 			}
 		}

 		table_desc.address = obj_desc->region.address;
 		table_desc.length = obj_desc->region.length;
 		table_desc.flags = ACPI_TABLE_ORIGIN_MAPPED;
 		break;

 	case ACPI_TYPE_BUFFER:	/* Buffer or resolved region_field */

 		/* Simply extract the buffer from the buffer object */

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

 		table_desc.pointer = ACPI_CAST_PTR(struct acpi_table_header,
 						   obj_desc->buffer.pointer);
 		table_desc.length = table_desc.pointer->length;
 		table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;

 		obj_desc->buffer.pointer = NULL;
 		break;

 	default:
 		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 	}

 	/*
 	 * Install the new table into the local data structures
 	 */
 	status = acpi_tb_add_table(&table_desc, &table_index);
 	if (ACPI_FAILURE(status)) {
 		goto cleanup;
 	}

 	status =
 	    acpi_ex_add_table(table_index, 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_tb_delete_table(&table_desc);
 	}
 	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;
 	acpi_native_uint table_index;

 	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 table index from the ddb_handle */

 	table_index = (acpi_native_uint) table_desc->reference.object;

 	/*
 	 * Delete the entire namespace under this table Node
 	 * (Offset contains the table_id)
 	 */
 	acpi_tb_delete_namespace_by_owner(table_index);
 	acpi_tb_release_owner_id(table_index);

 	acpi_tb_set_table_loaded_flag(table_index, FALSE);

 	/* Delete the table descriptor (ddb_handle) */

 	acpi_ut_remove_reference(table_desc);
 	return_ACPI_STATUS(status);
 }
	/******************************************************************************
	*
	* Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
	*
	*****************************************************************************/

	/*
	* Copyright (C) 2000 - 2007, 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(acpi_native_uint table_index,
	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(acpi_native_uint table_index,
	struct acpi_namespace_node *parent_node,
	union acpi_operand_object **ddb_handle)
	{
	acpi_status status;
	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 */

	obj_desc->reference.object = ACPI_CAST_PTR(void, table_index);

	/* Add the table to the namespace */

	status = acpi_ns_load_table(table_index, parent_node);
	if (ACPI_FAILURE(status)) {
	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 from the RSDT/XSDT
	*
	******************************************************************************/

	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];
	acpi_native_uint table_index;
	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;
	struct acpi_table_header *table;

	ACPI_FUNCTION_TRACE(ex_load_table_op);

	/* Find the ACPI table in the RSDT/XSDT */

	status = acpi_tb_find_table(operand[0]->string.pointer,
	operand[1]->string.pointer,
	operand[2]->string.pointer, &table_index);
	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(start_node, operand[3]->string.pointer,
	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(start_node, operand[4]->string.pointer,
	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_index, 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);
	}
	}

	status = acpi_get_table_by_index(table_index, &table);
	if (ACPI_SUCCESS(status)) {
	ACPI_INFO((AE_INFO,
	"Dynamic OEM Table Load - [%4.4s] OemId [%6.6s] OemTableId [%8.8s]",
	table->signature, table->oem_id,
	table->oem_table_id));
	}

	*return_desc = ddb_handle;
	return_ACPI_STATUS(status);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ex_load_op
	*
	* PARAMETERS: obj_desc - Region or Buffer/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
	*
	* NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
	* objects before this code is reached.
	*
	* If source is an operation region, it must refer to system_memory, as
	* per the ACPI specification.
	*
	******************************************************************************/

	acpi_status
	acpi_ex_load_op(union acpi_operand_object *obj_desc,
	union acpi_operand_object *target,
	struct acpi_walk_state *walk_state)
	{
	union acpi_operand_object *ddb_handle;
	struct acpi_table_desc table_desc;
	acpi_native_uint table_index;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ex_load_op);

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

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

	switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
	case ACPI_TYPE_REGION:

	/* Region must be system_memory (from ACPI spec) */

	if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	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);
	}
	}

	table_desc.address = obj_desc->region.address;
	table_desc.length = obj_desc->region.length;
	table_desc.flags = ACPI_TABLE_ORIGIN_MAPPED;
	break;

	case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */

	/* Simply extract the buffer from the buffer object */

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

	table_desc.pointer = ACPI_CAST_PTR(struct acpi_table_header,
	obj_desc->buffer.pointer);
	table_desc.length = table_desc.pointer->length;
	table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;

	obj_desc->buffer.pointer = NULL;
	break;

	default:
	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	/*
	* Install the new table into the local data structures
	*/
	status = acpi_tb_add_table(&table_desc, &table_index);
	if (ACPI_FAILURE(status)) {
	goto cleanup;
	}

	status =
	acpi_ex_add_table(table_index, 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_tb_delete_table(&table_desc);
	}
	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;
	acpi_native_uint table_index;

	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 table index from the ddb_handle */

	table_index = (acpi_native_uint) table_desc->reference.object;

	/*
	* Delete the entire namespace under this table Node
	* (Offset contains the table_id)
	*/
	acpi_tb_delete_namespace_by_owner(table_index);
	acpi_tb_release_owner_id(table_index);

	acpi_tb_set_table_loaded_flag(table_index, FALSE);

	/* Delete the table descriptor (ddb_handle) */

	acpi_ut_remove_reference(table_desc);
	return_ACPI_STATUS(status);
	}