text: /******************************************************************************
   *
   * Module Name: nsload - namespace loading/expanding/contracting procedures
   *
   *****************************************************************************/
  
  /*
   * Copyright (C) 2000 - 2016, 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"
  #include "acinterp.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);
  
  	/* 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 ****\n"));
  
  	status = acpi_tb_allocate_owner_id(table_index);
  	if (ACPI_FAILURE(status)) {
  		goto unlock;
  	}
  
  	/*
  	 * 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_ns_parse_table(table_index, node);
  	if (ACPI_SUCCESS(status)) {
  		acpi_tb_set_table_loaded_flag(table_index, TRUE);
  	} else {
  		/*
  		 * On error, delete any namespace objects created by this table.
  		 * We cannot initialize these objects, so delete them. There are
  		 * a couple of expecially bad cases:
  		 * AE_ALREADY_EXISTS - namespace collision.
  		 * AE_NOT_FOUND - the target of a Scope operator does not
  		 * exist. This target of Scope must already exist in the
  		 * namespace, as per the ACPI specification.
  		 */
  		acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list.
  						  tables[table_index].owner_id);
  
  		acpi_tb_release_owner_id(table_index);
  		return_ACPI_STATUS(status);
  	}
  
  unlock:
  	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 Object Initialization\n"));
  
  	acpi_ex_enter_interpreter();
  	status = acpi_ds_initialize_objects(table_index, node);
  	acpi_ex_exit_interpreter();
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  			  "**** Completed Table Object Initialization\n"));
  
  	/*
  	 * Execute any module-level code that was detected during the table load
  	 * phase. Although illegal since ACPI 2.0, there are many machines that
  	 * contain this type of code. Each block of detected executable AML code
  	 * outside of any control method is wrapped with a temporary control
  	 * method object and placed on a global list. The methods on this list
  	 * are executed below.
  	 *
  	 * This case executes the module-level code for each table immediately
  	 * after the table has been loaded. This provides compatibility with
  	 * other ACPI implementations. Optionally, the execution can be deferred
  	 * until later, see acpi_initialize_objects.
  	 */
  	if (!acpi_gbl_parse_table_as_term_list
  	    && !acpi_gbl_group_module_level_code) {
  		acpi_ns_exec_module_code_list();
  	}
  
  	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\n",
  			      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
  