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nsparse.c

/******************************************************************************
 *
 * Module Name: nsparse - namespace interface to AML parser
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, 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/acnamesp.h>
#include <acpi/acparser.h>
#include <acpi/acdispat.h>
#include <acpi/actables.h>

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsparse")

/*******************************************************************************
 *
 * 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
acpi_ns_one_complete_parse(acpi_native_uint pass_number,
                     acpi_native_uint table_index)
{
      union acpi_parse_object *parse_root;
      acpi_status status;
      acpi_native_uint aml_length;
      u8 *aml_start;
      struct acpi_walk_state *walk_state;
      struct acpi_table_header *table;
      acpi_owner_id owner_id;

      ACPI_FUNCTION_TRACE(ns_one_complete_parse);

      status = acpi_tb_get_owner_id(table_index, &owner_id);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      /* Create and init a Root Node */

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

      /* Create and initialize a new walk state */

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

      status = acpi_get_table_by_index(table_index, &table);
      if (ACPI_FAILURE(status)) {
            acpi_ds_delete_walk_state(walk_state);
            acpi_ps_free_op(parse_root);
            return_ACPI_STATUS(status);
      }

      /* Table must consist of at least a complete header */

      if (table->length < sizeof(struct acpi_table_header)) {
            status = AE_BAD_HEADER;
      } else {
            aml_start = (u8 *) table + sizeof(struct acpi_table_header);
            aml_length = table->length - sizeof(struct acpi_table_header);
            status = acpi_ds_init_aml_walk(walk_state, parse_root, NULL,
                                     aml_start, aml_length, NULL,
                                     (u8) pass_number);
      }

      if (ACPI_FAILURE(status)) {
            acpi_ds_delete_walk_state(walk_state);
            acpi_ps_delete_parse_tree(parse_root);
            return_ACPI_STATUS(status);
      }

      /* Parse the AML */

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

      acpi_ps_delete_parse_tree(parse_root);
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * 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
acpi_ns_parse_table(acpi_native_uint table_index,
                struct acpi_namespace_node *start_node)
{
      acpi_status status;

      ACPI_FUNCTION_TRACE(ns_parse_table);

      /*
       * 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.
       */
      ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 1\n"));
      status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS1, table_index);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      /*
       * 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.
       */
      ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 2\n"));
      status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS2, table_index);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      return_ACPI_STATUS(status);
}

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