nsload.c

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

/*
 * Copyright (C) 2000 - 2012, 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 ****\n"));

    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\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_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