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

 *

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

 *

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

/*

 * Copyright (C) 2000 - 2004, 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>

#define _COMPONENT          ACPI_NAMESPACE

         ACPI_MODULE_NAME    ("nsload")

#ifndef ACPI_NO_METHOD_EXECUTION

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

 *

 * FUNCTION:    acpi_ns_load_table

 *

 * PARAMETERS:  table_desc      - Descriptor 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 (

        struct acpi_table_desc          *table_desc,

        struct acpi_namespace_node      *node)

{

        acpi_status                     status;

        ACPI_FUNCTION_TRACE ("ns_load_table");

        /* Check if table contains valid AML (must be DSDT, PSDT, SSDT, etc.) */

        if (!(acpi_gbl_table_data[table_desc->type].flags & ACPI_TABLE_EXECUTABLE)) {

                /* Just ignore this table */

                return_ACPI_STATUS (AE_OK);

        }

        /* Check validity of the AML start and length */

        if (!table_desc->aml_start) {

                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null AML pointer\n"));

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "AML block at %p\n", table_desc->aml_start));

        /* Ignore table if there is no AML contained within */

        if (!table_desc->aml_length) {

                ACPI_REPORT_WARNING (("Zero-length AML block in table [%4.4s]\n", table_desc->pointer->signature));

                return_ACPI_STATUS (AE_OK);

        }

        /*

         * 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!

         */

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

        status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

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

        (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_desc, node);

        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,

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

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_ns_load_table_by_type

 *

 * PARAMETERS:  table_type          - Id of the table type to load

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Load an ACPI table or tables into the namespace.  All tables

 *              of the given type are loaded.  The mechanism allows this

 *              routine to be called repeatedly.

 *

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

acpi_status

acpi_ns_load_table_by_type (

        acpi_table_type                 table_type)

{

        u32                             i;

        acpi_status                     status;

        struct acpi_table_desc          *table_desc;

        ACPI_FUNCTION_TRACE ("ns_load_table_by_type");

        status = acpi_ut_acquire_mutex (ACPI_MTX_TABLES);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        /*

         * Table types supported are:

         * DSDT (one), SSDT/PSDT (multiple)

         */

        switch (table_type) {

        case ACPI_TABLE_DSDT:

                ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading DSDT\n"));

                table_desc = acpi_gbl_table_lists[ACPI_TABLE_DSDT].next;

                /* If table already loaded into namespace, just return */

                if (table_desc->loaded_into_namespace) {

                        goto unlock_and_exit;

                }

                /* Now load the single DSDT */

                status = acpi_ns_load_table (table_desc, acpi_gbl_root_node);

                if (ACPI_SUCCESS (status)) {

                        table_desc->loaded_into_namespace = TRUE;

                }

                break;

        case ACPI_TABLE_SSDT:

                ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading %d SSDTs\n",

                        acpi_gbl_table_lists[ACPI_TABLE_SSDT].count));

                /*

                 * Traverse list of SSDT tables

                 */

                table_desc = acpi_gbl_table_lists[ACPI_TABLE_SSDT].next;

                for (i = 0; i < acpi_gbl_table_lists[ACPI_TABLE_SSDT].count; i++) {

                        /*

                         * Only attempt to load table if it is not

                         * already loaded!

                         */

                        if (!table_desc->loaded_into_namespace) {

                                status = acpi_ns_load_table (table_desc, acpi_gbl_root_node);

                                if (ACPI_FAILURE (status)) {

                                        break;

                                }

                                table_desc->loaded_into_namespace = TRUE;

                        }

                        table_desc = table_desc->next;

                }

                break;

        case ACPI_TABLE_PSDT:

                ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Loading %d PSDTs\n",

                        acpi_gbl_table_lists[ACPI_TABLE_PSDT].count));

                /*

                 * Traverse list of PSDT tables

                 */

                table_desc = acpi_gbl_table_lists[ACPI_TABLE_PSDT].next;

                for (i = 0; i < acpi_gbl_table_lists[ACPI_TABLE_PSDT].count; i++) {

                        /* Only attempt to load table if it is not already loaded! */

                        if (!table_desc->loaded_into_namespace) {

                                status = acpi_ns_load_table (table_desc, acpi_gbl_root_node);

                                if (ACPI_FAILURE (status)) {

                                        break;

                                }

                                table_desc->loaded_into_namespace = TRUE;

                        }

                        table_desc = table_desc->next;

                }

                break;

        default:

                status = AE_SUPPORT;

                break;

        }

unlock_and_exit:

        (void) acpi_ut_release_mutex (ACPI_MTX_TABLES);

        return_ACPI_STATUS (status);

}

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

 *

 * 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_DEBUG_PRINT ((ACPI_DB_ERROR, "DSDT is not in memory\n"));

                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_DSDT);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        /* Ignore exceptions from these */

        (void) acpi_ns_load_table_by_type (ACPI_TABLE_SSDT);

        (void) acpi_ns_load_table_by_type (ACPI_TABLE_PSDT);

        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,

                "ACPI Namespace successfully loaded at root %p\n",

                acpi_gbl_root_node));

        return_ACPI_STATUS (status);

}

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

 *

 * 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.

 *

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

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 = 0;

        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,

                                         0, &dummy))) {

                                /*

                                 * There is at least one child of this object,

                                 * visit the object

                                 */

                                level++;

                                parent_handle = child_handle;

                                child_handle = 0;

                        }

                }

                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