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exconfig.c

/******************************************************************************
 *
 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
 *
 *****************************************************************************/

/*
 * 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/acinterp.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>
#include <acpi/acevents.h>
#include <acpi/actables.h>
#include <acpi/acdispat.h>

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exconfig")

/* Local prototypes */
static acpi_status
acpi_ex_add_table(acpi_native_uint table_index,
              struct acpi_namespace_node *parent_node,
              union acpi_operand_object **ddb_handle);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_add_table
 *
 * PARAMETERS:  Table               - Pointer to raw table
 *              parent_node         - Where to load the table (scope)
 *              ddb_handle          - Where to return the table handle.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Common function to Install and Load an ACPI table with a
 *              returned table handle.
 *
 ******************************************************************************/

static acpi_status
acpi_ex_add_table(acpi_native_uint table_index,
              struct acpi_namespace_node *parent_node,
              union acpi_operand_object **ddb_handle)
{
      acpi_status status;
      union acpi_operand_object *obj_desc;

      ACPI_FUNCTION_TRACE(ex_add_table);

      /* Create an object to be the table handle */

      obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
      if (!obj_desc) {
            return_ACPI_STATUS(AE_NO_MEMORY);
      }

      /* Init the table handle */

      obj_desc->reference.opcode = AML_LOAD_OP;
      *ddb_handle = obj_desc;

      /* Install the new table into the local data structures */

      obj_desc->reference.object = ACPI_CAST_PTR(void, table_index);

      /* Add the table to the namespace */

      status = acpi_ns_load_table(table_index, parent_node);
      if (ACPI_FAILURE(status)) {
            acpi_ut_remove_reference(obj_desc);
            *ddb_handle = NULL;
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_load_table_op
 *
 * PARAMETERS:  walk_state          - Current state with operands
 *              return_desc         - Where to store the return object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 *
 ******************************************************************************/

acpi_status
acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
                  union acpi_operand_object **return_desc)
{
      acpi_status status;
      union acpi_operand_object **operand = &walk_state->operands[0];
      acpi_native_uint table_index;
      struct acpi_namespace_node *parent_node;
      struct acpi_namespace_node *start_node;
      struct acpi_namespace_node *parameter_node = NULL;
      union acpi_operand_object *ddb_handle;
      struct acpi_table_header *table;

      ACPI_FUNCTION_TRACE(ex_load_table_op);

      /* Find the ACPI table in the RSDT/XSDT */

      status = acpi_tb_find_table(operand[0]->string.pointer,
                            operand[1]->string.pointer,
                            operand[2]->string.pointer, &table_index);
      if (ACPI_FAILURE(status)) {
            if (status != AE_NOT_FOUND) {
                  return_ACPI_STATUS(status);
            }

            /* Table not found, return an Integer=0 and AE_OK */

            ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
            if (!ddb_handle) {
                  return_ACPI_STATUS(AE_NO_MEMORY);
            }

            ddb_handle->integer.value = 0;
            *return_desc = ddb_handle;

            return_ACPI_STATUS(AE_OK);
      }

      /* Default nodes */

      start_node = walk_state->scope_info->scope.node;
      parent_node = acpi_gbl_root_node;

      /* root_path (optional parameter) */

      if (operand[3]->string.length > 0) {
            /*
             * Find the node referenced by the root_path_string. This is the
             * location within the namespace where the table will be loaded.
             */
            status =
                acpi_ns_get_node(start_node, operand[3]->string.pointer,
                             ACPI_NS_SEARCH_PARENT, &parent_node);
            if (ACPI_FAILURE(status)) {
                  return_ACPI_STATUS(status);
            }
      }

      /* parameter_path (optional parameter) */

      if (operand[4]->string.length > 0) {
            if ((operand[4]->string.pointer[0] != '\\') &&
                (operand[4]->string.pointer[0] != '^')) {
                  /*
                   * Path is not absolute, so it will be relative to the node
                   * referenced by the root_path_string (or the NS root if omitted)
                   */
                  start_node = parent_node;
            }

            /* Find the node referenced by the parameter_path_string */

            status =
                acpi_ns_get_node(start_node, operand[4]->string.pointer,
                             ACPI_NS_SEARCH_PARENT, &parameter_node);
            if (ACPI_FAILURE(status)) {
                  return_ACPI_STATUS(status);
            }
      }

      /* Load the table into the namespace */

      status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      /* Parameter Data (optional) */

      if (parameter_node) {

            /* Store the parameter data into the optional parameter object */

            status = acpi_ex_store(operand[5],
                               ACPI_CAST_PTR(union acpi_operand_object,
                                         parameter_node),
                               walk_state);
            if (ACPI_FAILURE(status)) {
                  (void)acpi_ex_unload_table(ddb_handle);
                  return_ACPI_STATUS(status);
            }
      }

      status = acpi_get_table_by_index(table_index, &table);
      if (ACPI_SUCCESS(status)) {
            ACPI_INFO((AE_INFO,
                     "Dynamic OEM Table Load - [%4.4s] OemId [%6.6s] OemTableId [%8.8s]",
                     table->signature, table->oem_id,
                     table->oem_table_id));
      }

      *return_desc = ddb_handle;
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_load_op
 *
 * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 *                                obtained
 *              Target          - Where a handle to the table will be stored
 *              walk_state      - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load an ACPI table from a field or operation region
 *
 * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 *       objects before this code is reached.
 *
 *       If source is an operation region, it must refer to system_memory, as
 *       per the ACPI specification.
 *
 ******************************************************************************/

acpi_status
acpi_ex_load_op(union acpi_operand_object *obj_desc,
            union acpi_operand_object *target,
            struct acpi_walk_state *walk_state)
{
      union acpi_operand_object *ddb_handle;
      struct acpi_table_desc table_desc;
      acpi_native_uint table_index;
      acpi_status status;

      ACPI_FUNCTION_TRACE(ex_load_op);

      ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));

      /* Source Object can be either an op_region or a Buffer/Field */

      switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
      case ACPI_TYPE_REGION:

            /* Region must be system_memory (from ACPI spec) */

            if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
                  return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
            }

            ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
                          obj_desc,
                          acpi_ut_get_object_type_name(obj_desc)));

            /*
             * If the Region Address and Length have not been previously evaluated,
             * evaluate them now and save the results.
             */
            if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
                  status = acpi_ds_get_region_arguments(obj_desc);
                  if (ACPI_FAILURE(status)) {
                        return_ACPI_STATUS(status);
                  }
            }

            table_desc.address = obj_desc->region.address;
            table_desc.length = obj_desc->region.length;
            table_desc.flags = ACPI_TABLE_ORIGIN_MAPPED;
            break;

      case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */

            /* Simply extract the buffer from the buffer object */

            ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                          "Load from Buffer or Field %p %s\n", obj_desc,
                          acpi_ut_get_object_type_name(obj_desc)));

            table_desc.pointer = ACPI_CAST_PTR(struct acpi_table_header,
                                       obj_desc->buffer.pointer);
            table_desc.length = table_desc.pointer->length;
            table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;

            obj_desc->buffer.pointer = NULL;
            break;

      default:
            return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
      }

      /*
       * Install the new table into the local data structures
       */
      status = acpi_tb_add_table(&table_desc, &table_index);
      if (ACPI_FAILURE(status)) {
            goto cleanup;
      }

      status =
          acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
      if (ACPI_FAILURE(status)) {

            /* On error, table_ptr was deallocated above */

            return_ACPI_STATUS(status);
      }

      /* Store the ddb_handle into the Target operand */

      status = acpi_ex_store(ddb_handle, target, walk_state);
      if (ACPI_FAILURE(status)) {
            (void)acpi_ex_unload_table(ddb_handle);

            /* table_ptr was deallocated above */

            return_ACPI_STATUS(status);
      }

      cleanup:
      if (ACPI_FAILURE(status)) {
            acpi_tb_delete_table(&table_desc);
      }
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_unload_table
 *
 * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Unload an ACPI table
 *
 ******************************************************************************/

acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
{
      acpi_status status = AE_OK;
      union acpi_operand_object *table_desc = ddb_handle;
      acpi_native_uint table_index;

      ACPI_FUNCTION_TRACE(ex_unload_table);

      /*
       * Validate the handle
       * Although the handle is partially validated in acpi_ex_reconfiguration(),
       * when it calls acpi_ex_resolve_operands(), the handle is more completely
       * validated here.
       */
      if ((!ddb_handle) ||
          (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
          (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
            return_ACPI_STATUS(AE_BAD_PARAMETER);
      }

      /* Get the table index from the ddb_handle */

      table_index = (acpi_native_uint) table_desc->reference.object;

      /*
       * Delete the entire namespace under this table Node
       * (Offset contains the table_id)
       */
      acpi_tb_delete_namespace_by_owner(table_index);
      acpi_tb_release_owner_id(table_index);

      acpi_tb_set_table_loaded_flag(table_index, FALSE);

      /* Delete the table descriptor (ddb_handle) */

      acpi_ut_remove_reference(table_desc);
      return_ACPI_STATUS(status);
}

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