nsparse.c 5.43 KB
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/******************************************************************************
 *
 * Module Name: nsparse - namespace interface to AML parser
 *
 *****************************************************************************/

/*
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 * Copyright (C) 2000 - 2006, R. Byron Moore
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 * 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/acnamesp.h>
#include <acpi/acparser.h>
#include <acpi/acdispat.h>

#define _COMPONENT          ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsparse")
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/*******************************************************************************
 *
 * FUNCTION:    ns_one_complete_parse
 *
 * PARAMETERS:  pass_number             - 1 or 2
 *              table_desc              - The table to be parsed.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform one complete parse of an ACPI/AML table.
 *
 ******************************************************************************/
acpi_status
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acpi_ns_one_complete_parse(u8 pass_number, struct acpi_table_desc *table_desc)
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{
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	union acpi_parse_object *parse_root;
	acpi_status status;
	struct acpi_walk_state *walk_state;
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	ACPI_FUNCTION_TRACE(ns_one_complete_parse);
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	/* Create and init a Root Node */

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	parse_root = acpi_ps_create_scope_op();
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	if (!parse_root) {
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		return_ACPI_STATUS(AE_NO_MEMORY);
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	}

	/* Create and initialize a new walk state */

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	walk_state = acpi_ds_create_walk_state(table_desc->owner_id,
					       NULL, NULL, NULL);
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	if (!walk_state) {
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		acpi_ps_free_op(parse_root);
		return_ACPI_STATUS(AE_NO_MEMORY);
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	}

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	status = acpi_ds_init_aml_walk(walk_state, parse_root, NULL,
				       table_desc->aml_start,
				       table_desc->aml_length, NULL,
				       pass_number);
	if (ACPI_FAILURE(status)) {
		acpi_ds_delete_walk_state(walk_state);
		return_ACPI_STATUS(status);
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	}

	/* Parse the AML */

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	ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "*PARSE* pass %d parse\n",
			  pass_number));
	status = acpi_ps_parse_aml(walk_state);
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	acpi_ps_delete_parse_tree(parse_root);
	return_ACPI_STATUS(status);
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}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_parse_table
 *
 * PARAMETERS:  table_desc      - An ACPI table descriptor for table to parse
 *              start_node      - Where to enter the table into the namespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
 *
 ******************************************************************************/

acpi_status
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acpi_ns_parse_table(struct acpi_table_desc *table_desc,
		    struct acpi_namespace_node *start_node)
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{
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	acpi_status status;
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	ACPI_FUNCTION_TRACE(ns_parse_table);
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	/*
	 * AML Parse, pass 1
	 *
	 * In this pass, we load most of the namespace.  Control methods
	 * are not parsed until later.  A parse tree is not created.  Instead,
	 * each Parser Op subtree is deleted when it is finished.  This saves
	 * a great deal of memory, and allows a small cache of parse objects
	 * to service the entire parse.  The second pass of the parse then
	 * performs another complete parse of the AML..
	 */
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	ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 1\n"));
	status = acpi_ns_one_complete_parse(1, table_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
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	}

	/*
	 * AML Parse, pass 2
	 *
	 * In this pass, we resolve forward references and other things
	 * that could not be completed during the first pass.
	 * Another complete parse of the AML is performed, but the
	 * overhead of this is compensated for by the fact that the
	 * parse objects are all cached.
	 */
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	ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 2\n"));
	status = acpi_ns_one_complete_parse(2, table_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
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	}

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	return_ACPI_STATUS(status);
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}