[GitHub/mt8127/android_kernel_alcatel_ttab.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_ID_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_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_COMPARE_NAME(table_ptr->signature, PSDT_SIG)) &&
	    (!ACPI_COMPARE_NAME(table_ptr->signature, SSDT_SIG))) {
		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_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
b229cf92	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
b229cf92	103	table_info.type = ACPI_TABLE_ID_SSDT;
4be44fcd LB	104	table_info.pointer = table;
4be44fcd LB	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	112	if (status == AE_ALREADY_EXISTS) {
52fc0b02	113
0c9938cc RM	114	/* Table already exists, just return the handle */
0c9938cc RM	115
4be44fcd	116	return_ACPI_STATUS(AE_OK);
0c9938cc	117	}
1da177e4 LT	118	goto cleanup;
	119	}
	120
	121	/* Add the table to the namespace */
	122
4be44fcd LB	123	status = acpi_ns_load_table(table_info.installed_desc, parent_node);
4be44fcd LB	124	if (ACPI_FAILURE(status)) {
52fc0b02	125
1da177e4 LT	126	/* Uninstall table on error */
1da177e4 LT	127
4be44fcd	128	(void)acpi_tb_uninstall_table(table_info.installed_desc);
1da177e4 LT	129	goto cleanup;
	130	}
	131
4be44fcd	132	return_ACPI_STATUS(AE_OK);
1da177e4	133
4be44fcd LB	134	cleanup:
4be44fcd LB	135	acpi_ut_remove_reference(obj_desc);
0c9938cc	136	*ddb_handle = NULL;
4be44fcd	137	return_ACPI_STATUS(status);
1da177e4 LT	138	}
1da177e4 LT	139
1da177e4 LT	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
4be44fcd LB	154	acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
4be44fcd LB	155	union acpi_operand_object **return_desc)
1da177e4	156	{
4be44fcd LB	157	acpi_status status;
	158	union acpi_operand_object **operand = &walk_state->operands[0];
	159	struct acpi_table_header *table;
	160	struct acpi_namespace_node *parent_node;
	161	struct acpi_namespace_node *start_node;
	162	struct acpi_namespace_node *parameter_node = NULL;
	163	union acpi_operand_object *ddb_handle;
1da177e4	164
b229cf92	165	ACPI_FUNCTION_TRACE(ex_load_table_op);
1da177e4 LT	166
	167	#if 0
	168	/*
	169	* Make sure that the signature does not match one of the tables that
	170	* is already loaded.
	171	*/
4be44fcd	172	status = acpi_tb_match_signature(operand[0]->string.pointer, NULL);
1da177e4	173	if (status == AE_OK) {
52fc0b02	174
1da177e4 LT	175	/* Signature matched -- don't allow override */
1da177e4 LT	176
4be44fcd	177	return_ACPI_STATUS(AE_ALREADY_EXISTS);
1da177e4 LT	178	}
	179	#endif
	180
	181	/* Find the ACPI table */
	182
4be44fcd LB	183	status = acpi_tb_find_table(operand[0]->string.pointer,
	184	operand[1]->string.pointer,
	185	operand[2]->string.pointer, &table);
	186	if (ACPI_FAILURE(status)) {
1da177e4	187	if (status != AE_NOT_FOUND) {
4be44fcd	188	return_ACPI_STATUS(status);
1da177e4 LT	189	}
	190
	191	/* Table not found, return an Integer=0 and AE_OK */
	192
4be44fcd	193	ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
1da177e4	194	if (!ddb_handle) {
4be44fcd	195	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	196	}
	197
	198	ddb_handle->integer.value = 0;
	199	*return_desc = ddb_handle;
	200
4be44fcd	201	return_ACPI_STATUS(AE_OK);
1da177e4 LT	202	}
	203
	204	/* Default nodes */
	205
	206	start_node = walk_state->scope_info->scope.node;
	207	parent_node = acpi_gbl_root_node;
	208
	209	/* root_path (optional parameter) */
	210
	211	if (operand[3]->string.length > 0) {
	212	/*
	213	* Find the node referenced by the root_path_string. This is the
	214	* location within the namespace where the table will be loaded.
	215	*/
4be44fcd LB	216	status =
	217	acpi_ns_get_node_by_path(operand[3]->string.pointer,
	218	start_node, ACPI_NS_SEARCH_PARENT,
	219	&parent_node);
	220	if (ACPI_FAILURE(status)) {
	221	return_ACPI_STATUS(status);
1da177e4 LT	222	}
	223	}
	224
	225	/* parameter_path (optional parameter) */
	226
	227	if (operand[4]->string.length > 0) {
	228	if ((operand[4]->string.pointer[0] != '\\') &&
4be44fcd	229	(operand[4]->string.pointer[0] != '^')) {
1da177e4 LT	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
4be44fcd LB	239	status =
	240	acpi_ns_get_node_by_path(operand[4]->string.pointer,
	241	start_node, ACPI_NS_SEARCH_PARENT,
	242	&parameter_node);
	243	if (ACPI_FAILURE(status)) {
	244	return_ACPI_STATUS(status);
1da177e4 LT	245	}
	246	}
	247
	248	/* Load the table into the namespace */
	249
4be44fcd LB	250	status = acpi_ex_add_table(table, parent_node, &ddb_handle);
	251	if (ACPI_FAILURE(status)) {
	252	return_ACPI_STATUS(status);
1da177e4 LT	253	}
	254
	255	/* Parameter Data (optional) */
	256
	257	if (parameter_node) {
52fc0b02	258
1da177e4 LT	259	/* Store the parameter data into the optional parameter object */
1da177e4 LT	260
4be44fcd LB	261	status = acpi_ex_store(operand[5],
	262	ACPI_CAST_PTR(union acpi_operand_object,
	263	parameter_node),
	264	walk_state);
	265	if (ACPI_FAILURE(status)) {
	266	(void)acpi_ex_unload_table(ddb_handle);
	267	return_ACPI_STATUS(status);
1da177e4 LT	268	}
	269	}
	270
	271	*return_desc = ddb_handle;
4be44fcd	272	return_ACPI_STATUS(status);
1da177e4 LT	273	}
1da177e4 LT	274
1da177e4 LT	275	/*******************************************************************************
	276	*
	277	* FUNCTION: acpi_ex_load_op
	278	*
	279	* PARAMETERS: obj_desc - Region or Field where the table will be
	280	* obtained
	281	* Target - Where a handle to the table will be stored
	282	* walk_state - Current state
	283	*
	284	* RETURN: Status
	285	*
	286	* DESCRIPTION: Load an ACPI table from a field or operation region
	287	*
	288	******************************************************************************/
	289
	290	acpi_status
4be44fcd LB	291	acpi_ex_load_op(union acpi_operand_object *obj_desc,
	292	union acpi_operand_object *target,
	293	struct acpi_walk_state *walk_state)
1da177e4	294	{
4be44fcd LB	295	acpi_status status;
	296	union acpi_operand_object *ddb_handle;
	297	union acpi_operand_object *buffer_desc = NULL;
	298	struct acpi_table_header *table_ptr = NULL;
	299	acpi_physical_address address;
	300	struct acpi_table_header table_header;
	301	u32 i;
1da177e4	302
b229cf92	303	ACPI_FUNCTION_TRACE(ex_load_op);
1da177e4 LT	304
	305	/* Object can be either an op_region or a Field */
	306
4be44fcd	307	switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
1da177e4 LT	308	case ACPI_TYPE_REGION:
1da177e4 LT	309
4be44fcd LB	310	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
	311	obj_desc,
	312	acpi_ut_get_object_type_name(obj_desc)));
1da177e4 LT	313
	314	/*
	315	* If the Region Address and Length have not been previously evaluated,
	316	* evaluate them now and save the results.
	317	*/
	318	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
4be44fcd LB	319	status = acpi_ds_get_region_arguments(obj_desc);
	320	if (ACPI_FAILURE(status)) {
	321	return_ACPI_STATUS(status);
1da177e4 LT	322	}
	323	}
	324
	325	/* Get the base physical address of the region */
	326
	327	address = obj_desc->region.address;
	328
	329	/* Get the table length from the table header */
	330
	331	table_header.length = 0;
	332	for (i = 0; i < 8; i++) {
4be44fcd LB	333	status =
	334	acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
	335	(acpi_physical_address)
	336	(i + address), 8,
	337	((u8 *) &
	338	table_header) + i);
	339	if (ACPI_FAILURE(status)) {
	340	return_ACPI_STATUS(status);
1da177e4 LT	341	}
	342	}
	343
	344	/* Sanity check the table length */
	345
4be44fcd LB	346	if (table_header.length < sizeof(struct acpi_table_header)) {
4be44fcd LB	347	return_ACPI_STATUS(AE_BAD_HEADER);
1da177e4 LT	348	}
	349
	350	/* Allocate a buffer for the entire table */
	351
8313524a	352	table_ptr = ACPI_ALLOCATE(table_header.length);
1da177e4	353	if (!table_ptr) {
4be44fcd	354	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	355	}
	356
	357	/* Get the entire table from the op region */
	358
	359	for (i = 0; i < table_header.length; i++) {
4be44fcd LB	360	status =
	361	acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
	362	(acpi_physical_address)
	363	(i + address), 8,
	364	((u8 *) table_ptr +
	365	i));
	366	if (ACPI_FAILURE(status)) {
1da177e4 LT	367	goto cleanup;
	368	}
	369	}
	370	break;
	371
1da177e4 LT	372	case ACPI_TYPE_LOCAL_REGION_FIELD:
	373	case ACPI_TYPE_LOCAL_BANK_FIELD:
	374	case ACPI_TYPE_LOCAL_INDEX_FIELD:
	375
4be44fcd LB	376	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Field %p %s\n",
	377	obj_desc,
	378	acpi_ut_get_object_type_name(obj_desc)));
1da177e4 LT	379
	380	/*
	381	* The length of the field must be at least as large as the table.
	382	* Read the entire field and thus the entire table. Buffer is
	383	* allocated during the read.
	384	*/
4be44fcd LB	385	status =
	386	acpi_ex_read_data_from_field(walk_state, obj_desc,
	387	&buffer_desc);
	388	if (ACPI_FAILURE(status)) {
	389	return_ACPI_STATUS(status);
1da177e4 LT	390	}
1da177e4 LT	391
4be44fcd LB	392	table_ptr = ACPI_CAST_PTR(struct acpi_table_header,
4be44fcd LB	393	buffer_desc->buffer.pointer);
1da177e4	394
88ac00f5 RM	395	/* All done with the buffer_desc, delete it */
	396
	397	buffer_desc->buffer.pointer = NULL;
4be44fcd	398	acpi_ut_remove_reference(buffer_desc);
88ac00f5 RM	399
88ac00f5 RM	400	/* Sanity check the table length */
1da177e4	401
4be44fcd	402	if (table_ptr->length < sizeof(struct acpi_table_header)) {
88ac00f5 RM	403	status = AE_BAD_HEADER;
88ac00f5 RM	404	goto cleanup;
1da177e4 LT	405	}
	406	break;
	407
1da177e4	408	default:
4be44fcd	409	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	410	}
	411
	412	/* The table must be either an SSDT or a PSDT */
	413
b229cf92 BM	414	if ((!ACPI_COMPARE_NAME(table_ptr->signature, PSDT_SIG)) &&
b229cf92 BM	415	(!ACPI_COMPARE_NAME(table_ptr->signature, SSDT_SIG))) {
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)) {
52fc0b02	427
88ac00f5 RM	428	/* On error, table_ptr was deallocated above */
88ac00f5 RM	429
4be44fcd	430	return_ACPI_STATUS(status);
1da177e4 LT	431	}
	432
	433	/* Store the ddb_handle into the Target operand */
	434
4be44fcd LB	435	status = acpi_ex_store(ddb_handle, target, walk_state);
	436	if (ACPI_FAILURE(status)) {
	437	(void)acpi_ex_unload_table(ddb_handle);
1da177e4	438
88ac00f5	439	/* table_ptr was deallocated above */
1da177e4	440
4be44fcd	441	return_ACPI_STATUS(status);
88ac00f5	442	}
1da177e4	443
4be44fcd LB	444	cleanup:
4be44fcd LB	445	if (ACPI_FAILURE(status)) {
8313524a	446	ACPI_FREE(table_ptr);
1da177e4	447	}
4be44fcd	448	return_ACPI_STATUS(status);
1da177e4 LT	449	}
1da177e4 LT	450
1da177e4 LT	451	/*******************************************************************************
	452	*
	453	* FUNCTION: acpi_ex_unload_table
	454	*
	455	* PARAMETERS: ddb_handle - Handle to a previously loaded table
	456	*
	457	* RETURN: Status
	458	*
	459	* DESCRIPTION: Unload an ACPI table
	460	*
	461	******************************************************************************/
	462
4be44fcd	463	acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
1da177e4	464	{
4be44fcd LB	465	acpi_status status = AE_OK;
	466	union acpi_operand_object *table_desc = ddb_handle;
	467	struct acpi_table_desc *table_info;
1da177e4	468
b229cf92	469	ACPI_FUNCTION_TRACE(ex_unload_table);
1da177e4 LT	470
	471	/*
	472	* Validate the handle
	473	* Although the handle is partially validated in acpi_ex_reconfiguration(),
	474	* when it calls acpi_ex_resolve_operands(), the handle is more completely
	475	* validated here.
	476	*/
	477	if ((!ddb_handle) \|\|
4be44fcd LB	478	(ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) \|\|
	479	(ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
	480	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	481	}
	482
	483	/* Get the actual table descriptor from the ddb_handle */
	484
4be44fcd	485	table_info = (struct acpi_table_desc *)table_desc->reference.object;
1da177e4 LT	486
	487	/*
	488	* Delete the entire namespace under this table Node
	489	* (Offset contains the table_id)
	490	*/
4be44fcd LB	491	acpi_ns_delete_namespace_by_owner(table_info->owner_id);
4be44fcd LB	492	acpi_ut_release_owner_id(&table_info->owner_id);
1da177e4 LT	493
	494	/* Delete the table itself */
	495
4be44fcd	496	(void)acpi_tb_uninstall_table(table_info->installed_desc);
1da177e4 LT	497
	498	/* Delete the table descriptor (ddb_handle) */
	499
4be44fcd LB	500	acpi_ut_remove_reference(table_desc);
4be44fcd LB	501	return_ACPI_STATUS(status);
1da177e4	502	}