dswload2.c 18 KB
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 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
/******************************************************************************
 *
 * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2013, Intel Corp.
 * 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 "accommon.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acevents.h"

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dswload2")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load2_begin_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              out_op          - Wher to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 *
 ******************************************************************************/
acpi_status
acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
		       union acpi_parse_object **out_op)
{
	union acpi_parse_object *op;
	struct acpi_namespace_node *node;
	acpi_status status;
	acpi_object_type object_type;
	char *buffer_ptr;
	u32 flags;

	ACPI_FUNCTION_TRACE(ds_load2_begin_op);

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
			  walk_state));

	if (op) {
		if ((walk_state->control_state) &&
		    (walk_state->control_state->common.state ==
		     ACPI_CONTROL_CONDITIONAL_EXECUTING)) {

			/* We are executing a while loop outside of a method */

			status = acpi_ds_exec_begin_op(walk_state, out_op);
			return_ACPI_STATUS(status);
		}

		/* We only care about Namespace opcodes here */

		if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
		     (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
		    (!(walk_state->op_info->flags & AML_NAMED))) {
			return_ACPI_STATUS(AE_OK);
		}

		/* Get the name we are going to enter or lookup in the namespace */

		if (walk_state->opcode == AML_INT_NAMEPATH_OP) {

			/* For Namepath op, get the path string */

			buffer_ptr = op->common.value.string;
			if (!buffer_ptr) {

				/* No name, just exit */

				return_ACPI_STATUS(AE_OK);
			}
		} else {
			/* Get name from the op */

			buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
		}
	} else {
		/* Get the namestring from the raw AML */

		buffer_ptr =
		    acpi_ps_get_next_namestring(&walk_state->parser_state);
	}

	/* Map the opcode into an internal object type */

	object_type = walk_state->op_info->object_type;

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "State=%p Op=%p Type=%X\n", walk_state, op,
			  object_type));

	switch (walk_state->opcode) {
	case AML_FIELD_OP:
	case AML_BANK_FIELD_OP:
	case AML_INDEX_FIELD_OP:

		node = NULL;
		status = AE_OK;
		break;

	case AML_INT_NAMEPATH_OP:
		/*
		 * The name_path is an object reference to an existing object.
		 * Don't enter the name into the namespace, but look it up
		 * for use later.
		 */
		status =
		    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
				   object_type, ACPI_IMODE_EXECUTE,
				   ACPI_NS_SEARCH_PARENT, walk_state, &(node));
		break;

	case AML_SCOPE_OP:

		/* Special case for Scope(\) -> refers to the Root node */

		if (op && (op->named.node == acpi_gbl_root_node)) {
			node = op->named.node;

			status =
			    acpi_ds_scope_stack_push(node, object_type,
						     walk_state);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		} else {
			/*
			 * The Path is an object reference to an existing object.
			 * Don't enter the name into the namespace, but look it up
			 * for use later.
			 */
			status =
			    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
					   object_type, ACPI_IMODE_EXECUTE,
					   ACPI_NS_SEARCH_PARENT, walk_state,
					   &(node));
			if (ACPI_FAILURE(status)) {
#ifdef ACPI_ASL_COMPILER
				if (status == AE_NOT_FOUND) {
					status = AE_OK;
				} else {
					ACPI_ERROR_NAMESPACE(buffer_ptr,
							     status);
				}
#else
				ACPI_ERROR_NAMESPACE(buffer_ptr, status);
#endif
				return_ACPI_STATUS(status);
			}
		}

		/*
		 * We must check to make sure that the target is
		 * one of the opcodes that actually opens a scope
		 */
		switch (node->type) {
		case ACPI_TYPE_ANY:
		case ACPI_TYPE_LOCAL_SCOPE:	/* Scope */
		case ACPI_TYPE_DEVICE:
		case ACPI_TYPE_POWER:
		case ACPI_TYPE_PROCESSOR:
		case ACPI_TYPE_THERMAL:

			/* These are acceptable types */
			break;

		case ACPI_TYPE_INTEGER:
		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:

			/*
			 * These types we will allow, but we will change the type.
			 * This enables some existing code of the form:
			 *
			 *  Name (DEB, 0)
			 *  Scope (DEB) { ... }
			 */
			ACPI_WARNING((AE_INFO,
				      "Type override - [%4.4s] had invalid type (%s) "
				      "for Scope operator, changed to type ANY",
				      acpi_ut_get_node_name(node),
				      acpi_ut_get_type_name(node->type)));

			node->type = ACPI_TYPE_ANY;
			walk_state->scope_info->common.value = ACPI_TYPE_ANY;
			break;

		case ACPI_TYPE_METHOD:

			/*
			 * Allow scope change to root during execution of module-level
			 * code. Root is typed METHOD during this time.
			 */
			if ((node == acpi_gbl_root_node) &&
			    (walk_state->
			     parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
				break;
			}

			/*lint -fallthrough */

		default:

			/* All other types are an error */

			ACPI_ERROR((AE_INFO,
				    "Invalid type (%s) for target of "
				    "Scope operator [%4.4s] (Cannot override)",
				    acpi_ut_get_type_name(node->type),
				    acpi_ut_get_node_name(node)));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}
		break;

	default:

		/* All other opcodes */

		if (op && op->common.node) {

			/* This op/node was previously entered into the namespace */

			node = op->common.node;

			if (acpi_ns_opens_scope(object_type)) {
				status =
				    acpi_ds_scope_stack_push(node, object_type,
							     walk_state);
				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}
			}

			return_ACPI_STATUS(AE_OK);
		}

		/*
		 * Enter the named type into the internal namespace. We enter the name
		 * as we go downward in the parse tree. Any necessary subobjects that
		 * involve arguments to the opcode must be created as we go back up the
		 * parse tree later.
		 *
		 * Note: Name may already exist if we are executing a deferred opcode.
		 */
		if (walk_state->deferred_node) {

			/* This name is already in the namespace, get the node */

			node = walk_state->deferred_node;
			status = AE_OK;
			break;
		}

		flags = ACPI_NS_NO_UPSEARCH;
		if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {

			/* Execution mode, node cannot already exist, node is temporary */

			flags |= ACPI_NS_ERROR_IF_FOUND;

			if (!
			    (walk_state->
			     parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
				flags |= ACPI_NS_TEMPORARY;
			}
		}

		/* Add new entry or lookup existing entry */

		status =
		    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
				   object_type, ACPI_IMODE_LOAD_PASS2, flags,
				   walk_state, &node);

		if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "***New Node [%4.4s] %p is temporary\n",
					  acpi_ut_get_node_name(node), node));
		}
		break;
	}

	if (ACPI_FAILURE(status)) {
		ACPI_ERROR_NAMESPACE(buffer_ptr, status);
		return_ACPI_STATUS(status);
	}

	if (!op) {

		/* Create a new op */

		op = acpi_ps_alloc_op(walk_state->opcode);
		if (!op) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Initialize the new op */

		if (node) {
			op->named.name = node->name.integer;
		}
		*out_op = op;
	}

	/*
	 * Put the Node in the "op" object that the parser uses, so we
	 * can get it again quickly when this scope is closed
	 */
	op->common.node = node;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load2_end_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the loading of the namespace,
 *              both control methods and everything else.
 *
 ******************************************************************************/

acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
{
	union acpi_parse_object *op;
	acpi_status status = AE_OK;
	acpi_object_type object_type;
	struct acpi_namespace_node *node;
	union acpi_parse_object *arg;
	struct acpi_namespace_node *new_node;
#ifndef ACPI_NO_METHOD_EXECUTION
	u32 i;
	u8 region_space;
#endif

	ACPI_FUNCTION_TRACE(ds_load2_end_op);

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
			  walk_state->op_info->name, op, walk_state));

	/* Check if opcode had an associated namespace object */

	if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
		return_ACPI_STATUS(AE_OK);
	}

	if (op->common.aml_opcode == AML_SCOPE_OP) {
		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "Ending scope Op=%p State=%p\n", op,
				  walk_state));
	}

	object_type = walk_state->op_info->object_type;

	/*
	 * Get the Node/name from the earlier lookup
	 * (It was saved in the *op structure)
	 */
	node = op->common.node;

	/*
	 * Put the Node on the object stack (Contains the ACPI Name of
	 * this object)
	 */
	walk_state->operands[0] = (void *)node;
	walk_state->num_operands = 1;

	/* Pop the scope stack */

	if (acpi_ns_opens_scope(object_type) &&
	    (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "(%s) Popping scope for Op %p\n",
				  acpi_ut_get_type_name(object_type), op));

		status = acpi_ds_scope_stack_pop(walk_state);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}
	}

	/*
	 * Named operations are as follows:
	 *
	 * AML_ALIAS
	 * AML_BANKFIELD
	 * AML_CREATEBITFIELD
	 * AML_CREATEBYTEFIELD
	 * AML_CREATEDWORDFIELD
	 * AML_CREATEFIELD
	 * AML_CREATEQWORDFIELD
	 * AML_CREATEWORDFIELD
	 * AML_DATA_REGION
	 * AML_DEVICE
	 * AML_EVENT
	 * AML_FIELD
	 * AML_INDEXFIELD
	 * AML_METHOD
	 * AML_METHODCALL
	 * AML_MUTEX
	 * AML_NAME
	 * AML_NAMEDFIELD
	 * AML_OPREGION
	 * AML_POWERRES
	 * AML_PROCESSOR
	 * AML_SCOPE
	 * AML_THERMALZONE
	 */

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
			  acpi_ps_get_opcode_name(op->common.aml_opcode),
			  walk_state, op, node));

	/* Decode the opcode */

	arg = op->common.value.arg;

	switch (walk_state->op_info->type) {
#ifndef ACPI_NO_METHOD_EXECUTION

	case AML_TYPE_CREATE_FIELD:
		/*
		 * Create the field object, but the field buffer and index must
		 * be evaluated later during the execution phase
		 */
		status = acpi_ds_create_buffer_field(op, walk_state);
		break;

	case AML_TYPE_NAMED_FIELD:
		/*
		 * If we are executing a method, initialize the field
		 */
		if (walk_state->method_node) {
			status = acpi_ds_init_field_objects(op, walk_state);
		}

		switch (op->common.aml_opcode) {
		case AML_INDEX_FIELD_OP:

			status =
			    acpi_ds_create_index_field(op,
						       (acpi_handle) arg->
						       common.node, walk_state);
			break;

		case AML_BANK_FIELD_OP:

			status =
			    acpi_ds_create_bank_field(op, arg->common.node,
						      walk_state);
			break;

		case AML_FIELD_OP:

			status =
			    acpi_ds_create_field(op, arg->common.node,
						 walk_state);
			break;

		default:

			/* All NAMED_FIELD opcodes must be handled above */
			break;
		}
		break;

	case AML_TYPE_NAMED_SIMPLE:

		status = acpi_ds_create_operands(walk_state, arg);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		switch (op->common.aml_opcode) {
		case AML_PROCESSOR_OP:

			status = acpi_ex_create_processor(walk_state);
			break;

		case AML_POWER_RES_OP:

			status = acpi_ex_create_power_resource(walk_state);
			break;

		case AML_MUTEX_OP:

			status = acpi_ex_create_mutex(walk_state);
			break;

		case AML_EVENT_OP:

			status = acpi_ex_create_event(walk_state);
			break;

		case AML_ALIAS_OP:

			status = acpi_ex_create_alias(walk_state);
			break;

		default:

			/* Unknown opcode */

			status = AE_OK;
			goto cleanup;
		}

		/* Delete operands */

		for (i = 1; i < walk_state->num_operands; i++) {
			acpi_ut_remove_reference(walk_state->operands[i]);
			walk_state->operands[i] = NULL;
		}

		break;
#endif				/* ACPI_NO_METHOD_EXECUTION */

	case AML_TYPE_NAMED_COMPLEX:

		switch (op->common.aml_opcode) {
#ifndef ACPI_NO_METHOD_EXECUTION
		case AML_REGION_OP:
		case AML_DATA_REGION_OP:

			if (op->common.aml_opcode == AML_REGION_OP) {
				region_space = (acpi_adr_space_type)
				    ((op->common.value.arg)->common.value.
				     integer);
			} else {
				region_space = ACPI_ADR_SPACE_DATA_TABLE;
			}

			/*
			 * The op_region is not fully parsed at this time. The only valid
			 * argument is the space_id. (We must save the address of the
			 * AML of the address and length operands)
			 *
			 * If we have a valid region, initialize it. The namespace is
			 * unlocked at this point.
			 *
			 * Need to unlock interpreter if it is locked (if we are running
			 * a control method), in order to allow _REG methods to be run
			 * during acpi_ev_initialize_region.
			 */
			if (walk_state->method_node) {
				/*
				 * Executing a method: initialize the region and unlock
				 * the interpreter
				 */
				status =
				    acpi_ex_create_region(op->named.data,
							  op->named.length,
							  region_space,
							  walk_state);
				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}

				acpi_ex_exit_interpreter();
			}

			status =
			    acpi_ev_initialize_region
			    (acpi_ns_get_attached_object(node), FALSE);
			if (walk_state->method_node) {
				acpi_ex_enter_interpreter();
			}

			if (ACPI_FAILURE(status)) {
				/*
				 *  If AE_NOT_EXIST is returned, it is not fatal
				 *  because many regions get created before a handler
				 *  is installed for said region.
				 */
				if (AE_NOT_EXIST == status) {
					status = AE_OK;
				}
			}
			break;

		case AML_NAME_OP:

			status = acpi_ds_create_node(walk_state, node, op);
			break;

		case AML_METHOD_OP:
			/*
			 * method_op pkg_length name_string method_flags term_list
			 *
			 * Note: We must create the method node/object pair as soon as we
			 * see the method declaration. This allows later pass1 parsing
			 * of invocations of the method (need to know the number of
			 * arguments.)
			 */
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
					  walk_state, op, op->named.node));

			if (!acpi_ns_get_attached_object(op->named.node)) {
				walk_state->operands[0] =
				    ACPI_CAST_PTR(void, op->named.node);
				walk_state->num_operands = 1;

				status =
				    acpi_ds_create_operands(walk_state,
							    op->common.value.
							    arg);
				if (ACPI_SUCCESS(status)) {
					status =
					    acpi_ex_create_method(op->named.
								  data,
								  op->named.
								  length,
								  walk_state);
				}
				walk_state->operands[0] = NULL;
				walk_state->num_operands = 0;

				if (ACPI_FAILURE(status)) {
					return_ACPI_STATUS(status);
				}
			}
			break;

#endif				/* ACPI_NO_METHOD_EXECUTION */

		default:

			/* All NAMED_COMPLEX opcodes must be handled above */
			break;
		}
		break;

	case AML_CLASS_INTERNAL:

		/* case AML_INT_NAMEPATH_OP: */
		break;

	case AML_CLASS_METHOD_CALL:

		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
				  walk_state, op, node));

		/*
		 * Lookup the method name and save the Node
		 */
		status =
		    acpi_ns_lookup(walk_state->scope_info,
				   arg->common.value.string, ACPI_TYPE_ANY,
				   ACPI_IMODE_LOAD_PASS2,
				   ACPI_NS_SEARCH_PARENT |
				   ACPI_NS_DONT_OPEN_SCOPE, walk_state,
				   &(new_node));
		if (ACPI_SUCCESS(status)) {
			/*
			 * Make sure that what we found is indeed a method
			 * We didn't search for a method on purpose, to see if the name
			 * would resolve
			 */
			if (new_node->type != ACPI_TYPE_METHOD) {
				status = AE_AML_OPERAND_TYPE;
			}

			/* We could put the returned object (Node) on the object stack for
			 * later, but for now, we will put it in the "op" object that the
			 * parser uses, so we can get it again at the end of this scope
			 */
			op->common.node = new_node;
		} else {
			ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
		}
		break;

	default:

		break;
	}

cleanup:

	/* Remove the Node pushed at the very beginning */

	walk_state->operands[0] = NULL;
	walk_state->num_operands = 0;
	return_ACPI_STATUS(status);
}