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/******************************************************************************

 *

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

 *

 *****************************************************************************/

/*

 * 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/acdispat.h>

#include <acpi/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(acpi_native_uint 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 ****\n"));

        status = acpi_tb_allocate_owner_id(table_index);

        if (ACPI_FAILURE(status)) {

                goto unlock;

        }

        status = acpi_ns_parse_table(table_index, node->child);

        if (ACPI_SUCCESS(status)) {

                acpi_tb_set_table_loaded_flag(table_index, TRUE);

        } else {

                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 ****\n"));

        status = acpi_ds_initialize_objects(table_index, node);

        ACPI_DEBUG_PRINT((ACPI_DB_INFO,

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

        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_delete_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