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nsload.c

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

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