exconfig.c 14.1 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
/******************************************************************************
 *
 * 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")

R
Robert Moore 已提交
57 58 59 60 61 62 63 64
/* 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);

L
Linus Torvalds 已提交
65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

/*******************************************************************************
 *
 * 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.
 *
 ******************************************************************************/

R
Robert Moore 已提交
81
static acpi_status
L
Linus Torvalds 已提交
82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105
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));

R
Robert Moore 已提交
106 107 108 109
	table_info.type      = ACPI_TABLE_SSDT;
	table_info.pointer   = table;
	table_info.length    = (acpi_size) table->length;
	table_info.allocation = ACPI_MEM_ALLOCATED;
L
Linus Torvalds 已提交
110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236

	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;
		}

R
Robert Moore 已提交
237 238
		/* Find the node referenced by the parameter_path_string */

L
Linus Torvalds 已提交
239
		status = acpi_ns_get_node_by_path (operand[4]->string.pointer, start_node,
R
Robert Moore 已提交
240
				 ACPI_NS_SEARCH_PARENT, &parameter_node);
L
Linus Torvalds 已提交
241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257
		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 */

R
Robert Moore 已提交
258 259
		status = acpi_ex_store (operand[5],
				 ACPI_CAST_PTR (union acpi_operand_object, parameter_node),
L
Linus Torvalds 已提交
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378
				 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)) {
379
			return_ACPI_STATUS (status);
L
Linus Torvalds 已提交
380 381
		}

R
Robert Moore 已提交
382 383
		table_ptr = ACPI_CAST_PTR (struct acpi_table_header,
				  buffer_desc->buffer.pointer);
L
Linus Torvalds 已提交
384

385 386 387 388 389 390
		/* All done with the buffer_desc, delete it */

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

		/* Sanity check the table length */
L
Linus Torvalds 已提交
391 392

		if (table_ptr->length < sizeof (struct acpi_table_header)) {
393 394
			status = AE_BAD_HEADER;
			goto cleanup;
L
Linus Torvalds 已提交
395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421
		}
		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)) {
422 423 424
		/* On error, table_ptr was deallocated above */

		return_ACPI_STATUS (status);
L
Linus Torvalds 已提交
425 426 427 428 429 430 431 432
	}

	/* 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);

433
		/* table_ptr was deallocated above */
L
Linus Torvalds 已提交
434

435 436
		return_ACPI_STATUS (status);
	}
L
Linus Torvalds 已提交
437 438

cleanup:
439
	if (ACPI_FAILURE (status)) {
L
Linus Torvalds 已提交
440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501
		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->table_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);
}