/******************************************************************************
   *
   * Module Name: nsload - namespace loading/expanding/contracting procedures
   *
   *****************************************************************************/
  
  /*

   * Copyright (C) 2000 - 2008, 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 "acnamesp.h"
  #include "acdispat.h"
  #include "actables.h"

  #define _COMPONENT          ACPI_NAMESPACE

  ACPI_MODULE_NAME("nsload")

  /* Local prototypes */

  #ifdef ACPI_FUTURE_IMPLEMENTATION

  acpi_status acpi_ns_unload_namespace(acpi_handle handle);

  static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);

  #endif

  #ifndef ACPI_NO_METHOD_EXECUTION

  /*******************************************************************************
   *
   * FUNCTION:    acpi_ns_load_table
   *

   * PARAMETERS:  table_index     - Index for table to be loaded

   *              Node            - Owning NS node
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Load one ACPI table into the namespace
   *
   ******************************************************************************/
  
  acpi_status

  acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)

  {

  	acpi_status status;

  	ACPI_FUNCTION_TRACE(ns_load_table);

  	/*
  	 * Parse the table and load the namespace with all named
  	 * objects found within.  Control methods are NOT parsed
  	 * at this time.  In fact, the control methods cannot be
  	 * parsed until the entire namespace is loaded, because
  	 * if a control method makes a forward reference (call)
  	 * to another control method, we can't continue parsing
  	 * because we don't know how many arguments to parse next!
  	 */

  	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	/* If table already loaded into namespace, just return */
  
  	if (acpi_tb_is_table_loaded(table_index)) {
  		status = AE_ALREADY_EXISTS;
  		goto unlock;
  	}

  	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  			  "**** Loading table into namespace ****
  "));

  	status = acpi_tb_allocate_owner_id(table_index);

  	if (ACPI_FAILURE(status)) {

  		goto unlock;

  	}

  	status = acpi_ns_parse_table(table_index, node);

  	if (ACPI_SUCCESS(status)) {
  		acpi_tb_set_table_loaded_flag(table_index, TRUE);
  	} else {

  		(void)acpi_tb_release_owner_id(table_index);

  	}
  
        unlock:

  	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

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

  	}
  
  	/*
  	 * Now we can parse the control methods.  We always parse
  	 * them here for a sanity check, and if configured for
  	 * just-in-time parsing, we delete the control method
  	 * parse trees.
  	 */

  	ACPI_DEBUG_PRINT((ACPI_DB_INFO,

  			  "**** Begin Table Method Parsing and Object Initialization
  "));

  	status = acpi_ds_initialize_objects(table_index, node);

  	ACPI_DEBUG_PRINT((ACPI_DB_INFO,

  			  "**** Completed Table Method Parsing and Object Initialization
  "));

  	return_ACPI_STATUS(status);

  }

  #ifdef ACPI_OBSOLETE_FUNCTIONS

  /*******************************************************************************
   *
   * FUNCTION:    acpi_load_namespace
   *
   * PARAMETERS:  None
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
   *              (DSDT points to either the BIOS or a buffer.)
   *
   ******************************************************************************/

  acpi_status acpi_ns_load_namespace(void)

  {

  	acpi_status status;

  	ACPI_FUNCTION_TRACE(acpi_load_name_space);

  
  	/* There must be at least a DSDT installed */
  
  	if (acpi_gbl_DSDT == NULL) {

  		ACPI_ERROR((AE_INFO, "DSDT is not in memory"));

  		return_ACPI_STATUS(AE_NO_ACPI_TABLES);

  	}
  
  	/*
  	 * Load the namespace.  The DSDT is required,
  	 * but the SSDT and PSDT tables are optional.
  	 */

  	status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);

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

  	}
  
  	/* Ignore exceptions from these */

  	(void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
  	(void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);

  	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
  			      "ACPI Namespace successfully loaded at root %p
  ",
  			      acpi_gbl_root_node));

  	return_ACPI_STATUS(status);

  }

  #endif

  #ifdef ACPI_FUTURE_IMPLEMENTATION

  /*******************************************************************************
   *
   * FUNCTION:    acpi_ns_delete_subtree
   *
   * PARAMETERS:  start_handle        - Handle in namespace where search begins
   *
   * RETURNS      Status
   *
   * DESCRIPTION: Walks the namespace starting at the given handle and deletes
   *              all objects, entries, and scopes in the entire subtree.
   *
   *              Namespace/Interpreter should be locked or the subsystem should
   *              be in shutdown before this routine is called.
   *
   ******************************************************************************/

  static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)

  {

  	acpi_status status;
  	acpi_handle child_handle;
  	acpi_handle parent_handle;
  	acpi_handle next_child_handle;
  	acpi_handle dummy;
  	u32 level;

  	ACPI_FUNCTION_TRACE(ns_delete_subtree);

  
  	parent_handle = start_handle;
  	child_handle = NULL;

  	level = 1;

  
  	/*
  	 * Traverse the tree of objects until we bubble back up
  	 * to where we started.
  	 */
  	while (level > 0) {

  		/* Attempt to get the next object in this scope */

  		status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
  					      child_handle, &next_child_handle);

  
  		child_handle = next_child_handle;
  
  		/* Did we get a new object? */

  		if (ACPI_SUCCESS(status)) {

  			/* Check if this object has any children */

  			if (ACPI_SUCCESS
  			    (acpi_get_next_object
  			     (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {

  				/*
  				 * There is at least one child of this object,
  				 * visit the object
  				 */
  				level++;
  				parent_handle = child_handle;
  				child_handle = NULL;
  			}

  		} else {

  			/*
  			 * No more children in this object, go back up to
  			 * the object's parent
  			 */
  			level--;
  
  			/* Delete all children now */

  			acpi_ns_delete_children(child_handle);

  
  			child_handle = parent_handle;

  			status = acpi_get_parent(parent_handle, &parent_handle);
  			if (ACPI_FAILURE(status)) {
  				return_ACPI_STATUS(status);

  			}
  		}
  	}
  
  	/* Now delete the starting object, and we are done */

  	acpi_ns_remove_node(child_handle);

  	return_ACPI_STATUS(AE_OK);

  }

  /*******************************************************************************
   *
   *  FUNCTION:       acpi_ns_unload_name_space
   *
   *  PARAMETERS:     Handle          - Root of namespace subtree to be deleted
   *
   *  RETURN:         Status
   *
   *  DESCRIPTION:    Shrinks the namespace, typically in response to an undocking
   *                  event.  Deletes an entire subtree starting from (and
   *                  including) the given handle.
   *
   ******************************************************************************/

  acpi_status acpi_ns_unload_namespace(acpi_handle handle)

  {

  	acpi_status status;

  	ACPI_FUNCTION_TRACE(ns_unload_name_space);

  
  	/* Parameter validation */
  
  	if (!acpi_gbl_root_node) {

  		return_ACPI_STATUS(AE_NO_NAMESPACE);

  	}
  
  	if (!handle) {

  		return_ACPI_STATUS(AE_BAD_PARAMETER);

  	}
  
  	/* This function does the real work */

  	status = acpi_ns_delete_subtree(handle);

  	return_ACPI_STATUS(status);

  }

  #endif

  #endif