[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / executer / exconfig.c

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

/*
 * Copyright (C) 2000 - 2005, 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);
	}

	/* 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);
	if (ACPI_FAILURE (status)) {
		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;
	}

	/* Init the table handle */

	obj_desc->reference.opcode = AML_LOAD_OP;
	obj_desc->reference.object = table_info.installed_desc;
	*ddb_handle = obj_desc;
	return_ACPI_STATUS (AE_OK);


cleanup:
	acpi_ut_remove_reference (obj_desc);
	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_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Table has invalid signature [%4.4s], must be SSDT or PSDT\n",
			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);

	/* 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	/*
	8	* Copyright (C) 2000 - 2005, R. Byron Moore
	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
	44
	45	#include <acpi/acpi.h>
	46	#include <acpi/acinterp.h>
	47	#include <acpi/amlcode.h>
	48	#include <acpi/acnamesp.h>
	49	#include <acpi/acevents.h>
	50	#include <acpi/actables.h>
	51	#include <acpi/acdispat.h>
	52
	53
	54	#define _COMPONENT ACPI_EXECUTER
	55	ACPI_MODULE_NAME ("exconfig")
	56
44f6c012 RM	57	/* Local prototypes */
	58
	59	static acpi_status
	60	acpi_ex_add_table (
	61	struct acpi_table_header *table,
	62	struct acpi_namespace_node *parent_node,
	63	union acpi_operand_object **ddb_handle);
	64
1da177e4 LT	65
	66	/*******************************************************************************
	67	*
	68	* FUNCTION: acpi_ex_add_table
	69	*
	70	* PARAMETERS: Table - Pointer to raw table
	71	* parent_node - Where to load the table (scope)
	72	* ddb_handle - Where to return the table handle.
	73	*
	74	* RETURN: Status
	75	*
	76	* DESCRIPTION: Common function to Install and Load an ACPI table with a
	77	* returned table handle.
	78	*
	79	******************************************************************************/
	80
44f6c012	81	static acpi_status
1da177e4 LT	82	acpi_ex_add_table (
	83	struct acpi_table_header *table,
	84	struct acpi_namespace_node *parent_node,
	85	union acpi_operand_object **ddb_handle)
	86	{
	87	acpi_status status;
	88	struct acpi_table_desc table_info;
	89	union acpi_operand_object *obj_desc;
	90
	91
	92	ACPI_FUNCTION_TRACE ("ex_add_table");
	93
	94
	95	/* Create an object to be the table handle */
	96
	97	obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_REFERENCE);
	98	if (!obj_desc) {
	99	return_ACPI_STATUS (AE_NO_MEMORY);
	100	}
	101
	102	/* Install the new table into the local data structures */
	103
	104	ACPI_MEMSET (&table_info, 0, sizeof (struct acpi_table_desc));
	105
44f6c012 RM	106	table_info.type = ACPI_TABLE_SSDT;
	107	table_info.pointer = table;
	108	table_info.length = (acpi_size) table->length;
	109	table_info.allocation = ACPI_MEM_ALLOCATED;
1da177e4 LT	110
	111	status = acpi_tb_install_table (&table_info);
	112	if (ACPI_FAILURE (status)) {
	113	goto cleanup;
	114	}
	115
	116	/* Add the table to the namespace */
	117
	118	status = acpi_ns_load_table (table_info.installed_desc, parent_node);
	119	if (ACPI_FAILURE (status)) {
	120	/* Uninstall table on error */
	121
	122	(void) acpi_tb_uninstall_table (table_info.installed_desc);
	123	goto cleanup;
	124	}
	125
	126	/* Init the table handle */
	127
	128	obj_desc->reference.opcode = AML_LOAD_OP;
	129	obj_desc->reference.object = table_info.installed_desc;
	130	*ddb_handle = obj_desc;
	131	return_ACPI_STATUS (AE_OK);
	132
	133
	134	cleanup:
	135	acpi_ut_remove_reference (obj_desc);
	136	return_ACPI_STATUS (status);
	137	}
	138
	139
	140	/*******************************************************************************
	141	*
	142	* FUNCTION: acpi_ex_load_table_op
	143	*
	144	* PARAMETERS: walk_state - Current state with operands
	145	* return_desc - Where to store the return object
	146	*
	147	* RETURN: Status
	148	*
	149	* DESCRIPTION: Load an ACPI table
	150	*
	151	******************************************************************************/
	152
	153	acpi_status
	154	acpi_ex_load_table_op (
	155	struct acpi_walk_state *walk_state,
	156	union acpi_operand_object **return_desc)
	157	{
	158	acpi_status status;
	159	union acpi_operand_object **operand = &walk_state->operands[0];
	160	struct acpi_table_header *table;
	161	struct acpi_namespace_node *parent_node;
	162	struct acpi_namespace_node *start_node;
	163	struct acpi_namespace_node *parameter_node = NULL;
	164	union acpi_operand_object *ddb_handle;
	165
	166
	167	ACPI_FUNCTION_TRACE ("ex_load_table_op");
	168
	169
	170	#if 0
	171	/*
	172	* Make sure that the signature does not match one of the tables that
	173	* is already loaded.
174	*/
175	status = acpi_tb_match_signature (operand[0]->string.pointer, NULL);
176	if (status == AE_OK) {
177	/* Signature matched -- don't allow override */
178
179	return_ACPI_STATUS (AE_ALREADY_EXISTS);
180	}
181	#endif
182
183	/* Find the ACPI table */
184
185	status = acpi_tb_find_table (operand[0]->string.pointer,
186	operand[1]->string.pointer,
187	operand[2]->string.pointer, &table);
188	if (ACPI_FAILURE (status)) {
189	if (status != AE_NOT_FOUND) {
190	return_ACPI_STATUS (status);
191	}
192
193	/* Table not found, return an Integer=0 and AE_OK */
194
195	ddb_handle = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
196	if (!ddb_handle) {
197	return_ACPI_STATUS (AE_NO_MEMORY);
198	}
199
200	ddb_handle->integer.value = 0;
201	*return_desc = ddb_handle;
202
203	return_ACPI_STATUS (AE_OK);
204	}
205
206	/* Default nodes */
207
208	start_node = walk_state->scope_info->scope.node;
209	parent_node = acpi_gbl_root_node;
210
211	/* root_path (optional parameter) */
212
213	if (operand[3]->string.length > 0) {
214	/*
215	* Find the node referenced by the root_path_string. This is the
216	* location within the namespace where the table will be loaded.
217	*/
218	status = acpi_ns_get_node_by_path (operand[3]->string.pointer, start_node,
219	ACPI_NS_SEARCH_PARENT, &parent_node);
220	if (ACPI_FAILURE (status)) {
221	return_ACPI_STATUS (status);
222	}
223	}
224
225	/* parameter_path (optional parameter) */
226
227	if (operand[4]->string.length > 0) {
228	if ((operand[4]->string.pointer[0] != '\\') &&
229	(operand[4]->string.pointer[0] != '^')) {
230	/*
231	* Path is not absolute, so it will be relative to the node
232	* referenced by the root_path_string (or the NS root if omitted)
233	*/
234	start_node = parent_node;
235	}
236
44f6c012 RM	237	/* Find the node referenced by the parameter_path_string */
44f6c012 RM	238
1da177e4	239	status = acpi_ns_get_node_by_path (operand[4]->string.pointer, start_node,
44f6c012	240	ACPI_NS_SEARCH_PARENT, &parameter_node);
1da177e4 LT	241	if (ACPI_FAILURE (status)) {
	242	return_ACPI_STATUS (status);
	243	}
	244	}
	245
	246	/* Load the table into the namespace */
	247
	248	status = acpi_ex_add_table (table, parent_node, &ddb_handle);
	249	if (ACPI_FAILURE (status)) {
	250	return_ACPI_STATUS (status);
	251	}
	252
	253	/* Parameter Data (optional) */
	254
	255	if (parameter_node) {
	256	/* Store the parameter data into the optional parameter object */
	257
44f6c012 RM	258	status = acpi_ex_store (operand[5],
44f6c012 RM	259	ACPI_CAST_PTR (union acpi_operand_object, parameter_node),
1da177e4 LT	260	walk_state);
	261	if (ACPI_FAILURE (status)) {
	262	(void) acpi_ex_unload_table (ddb_handle);
	263	return_ACPI_STATUS (status);
	264	}
	265	}
	266
	267	*return_desc = ddb_handle;
	268	return_ACPI_STATUS (status);
	269	}
	270
	271
	272	/*******************************************************************************
	273	*
	274	* FUNCTION: acpi_ex_load_op
	275	*
	276	* PARAMETERS: obj_desc - Region or Field where the table will be
	277	* obtained
	278	* Target - Where a handle to the table will be stored
	279	* walk_state - Current state
	280	*
	281	* RETURN: Status
	282	*
	283	* DESCRIPTION: Load an ACPI table from a field or operation region
	284	*
	285	******************************************************************************/
	286
	287	acpi_status
	288	acpi_ex_load_op (
	289	union acpi_operand_object *obj_desc,
	290	union acpi_operand_object *target,
	291	struct acpi_walk_state *walk_state)
	292	{
	293	acpi_status status;
	294	union acpi_operand_object *ddb_handle;
	295	union acpi_operand_object *buffer_desc = NULL;
	296	struct acpi_table_header *table_ptr = NULL;
	297	acpi_physical_address address;
	298	struct acpi_table_header table_header;
	299	u32 i;
	300
	301	ACPI_FUNCTION_TRACE ("ex_load_op");
	302
	303
	304	/* Object can be either an op_region or a Field */
	305
	306	switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
	307	case ACPI_TYPE_REGION:
	308
	309	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Load from Region %p %s\n",
	310	obj_desc, acpi_ut_get_object_type_name (obj_desc)));
	311
	312	/*
	313	* If the Region Address and Length have not been previously evaluated,
	314	* evaluate them now and save the results.
	315	*/
	316	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
	317	status = acpi_ds_get_region_arguments (obj_desc);
	318	if (ACPI_FAILURE (status)) {
	319	return_ACPI_STATUS (status);
	320	}
	321	}
	322
	323	/* Get the base physical address of the region */
324
325	address = obj_desc->region.address;
326
327	/* Get the table length from the table header */
328
329	table_header.length = 0;
330	for (i = 0; i < 8; i++) {
331	status = acpi_ev_address_space_dispatch (obj_desc, ACPI_READ,
332	(acpi_physical_address) (i + address), 8,
333	((u8 *) &table_header) + i);
334	if (ACPI_FAILURE (status)) {
335	return_ACPI_STATUS (status);
336	}
337	}
338
339	/* Sanity check the table length */
340
341	if (table_header.length < sizeof (struct acpi_table_header)) {
342	return_ACPI_STATUS (AE_BAD_HEADER);
343	}
344
345	/* Allocate a buffer for the entire table */
346
347	table_ptr = ACPI_MEM_ALLOCATE (table_header.length);
348	if (!table_ptr) {
349	return_ACPI_STATUS (AE_NO_MEMORY);
350	}
351
352	/* Get the entire table from the op region */
353
354	for (i = 0; i < table_header.length; i++) {
355	status = acpi_ev_address_space_dispatch (obj_desc, ACPI_READ,
356	(acpi_physical_address) (i + address), 8,
357	((u8 *) table_ptr + i));
358	if (ACPI_FAILURE (status)) {
359	goto cleanup;
360	}
361	}
362	break;
363
364
365	case ACPI_TYPE_LOCAL_REGION_FIELD:
366	case ACPI_TYPE_LOCAL_BANK_FIELD:
367	case ACPI_TYPE_LOCAL_INDEX_FIELD:
368
369	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Load from Field %p %s\n",
370	obj_desc, acpi_ut_get_object_type_name (obj_desc)));
371
372	/*
373	* The length of the field must be at least as large as the table.
374	* Read the entire field and thus the entire table. Buffer is
375	* allocated during the read.
376	*/
377	status = acpi_ex_read_data_from_field (walk_state, obj_desc, &buffer_desc);
378	if (ACPI_FAILURE (status)) {
88ac00f5	379	return_ACPI_STATUS (status);
1da177e4 LT	380	}
1da177e4 LT	381
44f6c012 RM	382	table_ptr = ACPI_CAST_PTR (struct acpi_table_header,
44f6c012 RM	383	buffer_desc->buffer.pointer);
1da177e4	384
88ac00f5 RM	385	/* All done with the buffer_desc, delete it */
	386
	387	buffer_desc->buffer.pointer = NULL;
	388	acpi_ut_remove_reference (buffer_desc);
	389
	390	/* Sanity check the table length */
1da177e4 LT	391
1da177e4 LT	392	if (table_ptr->length < sizeof (struct acpi_table_header)) {
88ac00f5 RM	393	status = AE_BAD_HEADER;
88ac00f5 RM	394	goto cleanup;
1da177e4 LT	395	}
	396	break;
	397
	398
	399	default:
	400	return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
	401	}
	402
	403	/* The table must be either an SSDT or a PSDT */
	404
	405	if ((!ACPI_STRNCMP (table_ptr->signature,
	406	acpi_gbl_table_data[ACPI_TABLE_PSDT].signature,
	407	acpi_gbl_table_data[ACPI_TABLE_PSDT].sig_length)) &&
	408	(!ACPI_STRNCMP (table_ptr->signature,
	409	acpi_gbl_table_data[ACPI_TABLE_SSDT].signature,
	410	acpi_gbl_table_data[ACPI_TABLE_SSDT].sig_length))) {
	411	ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
	412	"Table has invalid signature [%4.4s], must be SSDT or PSDT\n",
	413	table_ptr->signature));
	414	status = AE_BAD_SIGNATURE;
	415	goto cleanup;
	416	}
	417
	418	/* Install the new table into the local data structures */
	419
	420	status = acpi_ex_add_table (table_ptr, acpi_gbl_root_node, &ddb_handle);
	421	if (ACPI_FAILURE (status)) {
88ac00f5 RM	422	/* On error, table_ptr was deallocated above */
	423
	424	return_ACPI_STATUS (status);
1da177e4 LT	425	}
	426
	427	/* Store the ddb_handle into the Target operand */
	428
	429	status = acpi_ex_store (ddb_handle, target, walk_state);
	430	if (ACPI_FAILURE (status)) {
	431	(void) acpi_ex_unload_table (ddb_handle);
1da177e4	432
88ac00f5	433	/* table_ptr was deallocated above */
1da177e4	434
88ac00f5 RM	435	return_ACPI_STATUS (status);
88ac00f5 RM	436	}
1da177e4 LT	437
1da177e4 LT	438	cleanup:
88ac00f5	439	if (ACPI_FAILURE (status)) {
1da177e4 LT	440	ACPI_MEM_FREE (table_ptr);
	441	}
	442	return_ACPI_STATUS (status);
	443	}
	444
	445
	446	/*******************************************************************************
	447	*
	448	* FUNCTION: acpi_ex_unload_table
	449	*
	450	* PARAMETERS: ddb_handle - Handle to a previously loaded table
	451	*
	452	* RETURN: Status
	453	*
	454	* DESCRIPTION: Unload an ACPI table
	455	*
	456	******************************************************************************/
	457
	458	acpi_status
	459	acpi_ex_unload_table (
	460	union acpi_operand_object *ddb_handle)
	461	{
	462	acpi_status status = AE_OK;
	463	union acpi_operand_object *table_desc = ddb_handle;
	464	struct acpi_table_desc *table_info;
	465
	466
	467	ACPI_FUNCTION_TRACE ("ex_unload_table");
	468
	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) \|\|
	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);
	480	}
	481
	482	/* Get the actual table descriptor from the ddb_handle */
	483
	484	table_info = (struct acpi_table_desc *) table_desc->reference.object;
	485
	486	/*
	487	* Delete the entire namespace under this table Node
	488	* (Offset contains the table_id)
	489	*/
f9f4601f	490	acpi_ns_delete_namespace_by_owner (table_info->owner_id);
1da177e4 LT	491
	492	/* Delete the table itself */
	493
	494	(void) acpi_tb_uninstall_table (table_info->installed_desc);
	495
	496	/* Delete the table descriptor (ddb_handle) */
	497
	498	acpi_ut_remove_reference (table_desc);
	499	return_ACPI_STATUS (status);
	500	}
	501