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exstoren.c

/******************************************************************************
 *
 * Module Name: exstoren - AML Interpreter object store support,
 *                        Store to Node (namespace object)
 *
 *****************************************************************************/

/*
 * 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>

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exstoren")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_resolve_object
 *
 * PARAMETERS:  source_desc_ptr     - Pointer to the source object
 *              target_type         - Current type of the target
 *              walk_state          - Current walk state
 *
 * RETURN:      Status, resolved object in source_desc_ptr.
 *
 * DESCRIPTION: Resolve an object.  If the object is a reference, dereference
 *              it and return the actual object in the source_desc_ptr.
 *
 ******************************************************************************/
acpi_status
acpi_ex_resolve_object(union acpi_operand_object **source_desc_ptr,
                   acpi_object_type target_type,
                   struct acpi_walk_state *walk_state)
{
      union acpi_operand_object *source_desc = *source_desc_ptr;
      acpi_status status = AE_OK;

      ACPI_FUNCTION_TRACE(ex_resolve_object);

      /* Ensure we have a Target that can be stored to */

      switch (target_type) {
      case ACPI_TYPE_BUFFER_FIELD:
      case ACPI_TYPE_LOCAL_REGION_FIELD:
      case ACPI_TYPE_LOCAL_BANK_FIELD:
      case ACPI_TYPE_LOCAL_INDEX_FIELD:
            /*
             * These cases all require only Integers or values that
             * can be converted to Integers (Strings or Buffers)
             */

      case ACPI_TYPE_INTEGER:
      case ACPI_TYPE_STRING:
      case ACPI_TYPE_BUFFER:

            /*
             * Stores into a Field/Region or into a Integer/Buffer/String
             * are all essentially the same.  This case handles the
             * "interchangeable" types Integer, String, and Buffer.
             */
            if (ACPI_GET_OBJECT_TYPE(source_desc) ==
                ACPI_TYPE_LOCAL_REFERENCE) {

                  /* Resolve a reference object first */

                  status =
                      acpi_ex_resolve_to_value(source_desc_ptr,
                                         walk_state);
                  if (ACPI_FAILURE(status)) {
                        break;
                  }
            }

            /* For copy_object, no further validation necessary */

            if (walk_state->opcode == AML_COPY_OP) {
                  break;
            }

            /* Must have a Integer, Buffer, or String */

            if ((ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) &&
                (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) &&
                (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) &&
                !((ACPI_GET_OBJECT_TYPE(source_desc) ==
                   ACPI_TYPE_LOCAL_REFERENCE)
                  && (source_desc->reference.opcode == AML_LOAD_OP))) {

                  /* Conversion successful but still not a valid type */

                  ACPI_ERROR((AE_INFO,
                            "Cannot assign type %s to %s (must be type Int/Str/Buf)",
                            acpi_ut_get_object_type_name(source_desc),
                            acpi_ut_get_type_name(target_type)));
                  status = AE_AML_OPERAND_TYPE;
            }
            break;

      case ACPI_TYPE_LOCAL_ALIAS:
      case ACPI_TYPE_LOCAL_METHOD_ALIAS:

            /*
             * All aliases should have been resolved earlier, during the
             * operand resolution phase.
             */
            ACPI_ERROR((AE_INFO, "Store into an unresolved Alias object"));
            status = AE_AML_INTERNAL;
            break;

      case ACPI_TYPE_PACKAGE:
      default:

            /*
             * All other types than Alias and the various Fields come here,
             * including the untyped case - ACPI_TYPE_ANY.
             */
            break;
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_object_to_object
 *
 * PARAMETERS:  source_desc         - Object to store
 *              dest_desc           - Object to receive a copy of the source
 *              new_desc            - New object if dest_desc is obsoleted
 *              walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: "Store" an object to another object.  This may include
 *              converting the source type to the target type (implicit
 *              conversion), and a copy of the value of the source to
 *              the target.
 *
 *              The Assignment of an object to another (not named) object
 *              is handled here.
 *              The Source passed in will replace the current value (if any)
 *              with the input value.
 *
 *              When storing into an object the data is converted to the
 *              target object type then stored in the object.  This means
 *              that the target object type (for an initialized target) will
 *              not be changed by a store operation.
 *
 *              This module allows destination types of Number, String,
 *              Buffer, and Package.
 *
 *              Assumes parameters are already validated.  NOTE: source_desc
 *              resolution (from a reference object) must be performed by
 *              the caller if necessary.
 *
 ******************************************************************************/

acpi_status
acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
                         union acpi_operand_object *dest_desc,
                         union acpi_operand_object **new_desc,
                         struct acpi_walk_state *walk_state)
{
      union acpi_operand_object *actual_src_desc;
      acpi_status status = AE_OK;

      ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_object, source_desc);

      actual_src_desc = source_desc;
      if (!dest_desc) {
            /*
             * There is no destination object (An uninitialized node or
             * package element), so we can simply copy the source object
             * creating a new destination object
             */
            status =
                acpi_ut_copy_iobject_to_iobject(actual_src_desc, new_desc,
                                        walk_state);
            return_ACPI_STATUS(status);
      }

      if (ACPI_GET_OBJECT_TYPE(source_desc) !=
          ACPI_GET_OBJECT_TYPE(dest_desc)) {
            /*
             * The source type does not match the type of the destination.
             * Perform the "implicit conversion" of the source to the current type
             * of the target as per the ACPI specification.
             *
             * If no conversion performed, actual_src_desc = source_desc.
             * Otherwise, actual_src_desc is a temporary object to hold the
             * converted object.
             */
            status =
                acpi_ex_convert_to_target_type(ACPI_GET_OBJECT_TYPE
                                       (dest_desc), source_desc,
                                       &actual_src_desc,
                                       walk_state);
            if (ACPI_FAILURE(status)) {
                  return_ACPI_STATUS(status);
            }

            if (source_desc == actual_src_desc) {
                  /*
                   * No conversion was performed. Return the source_desc as the
                   * new object.
                   */
                  *new_desc = source_desc;
                  return_ACPI_STATUS(AE_OK);
            }
      }

      /*
       * We now have two objects of identical types, and we can perform a
       * copy of the *value* of the source object.
       */
      switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
      case ACPI_TYPE_INTEGER:

            dest_desc->integer.value = actual_src_desc->integer.value;

            /* Truncate value if we are executing from a 32-bit ACPI table */

            acpi_ex_truncate_for32bit_table(dest_desc);
            break;

      case ACPI_TYPE_STRING:

            status =
                acpi_ex_store_string_to_string(actual_src_desc, dest_desc);
            break;

      case ACPI_TYPE_BUFFER:

            status =
                acpi_ex_store_buffer_to_buffer(actual_src_desc, dest_desc);
            break;

      case ACPI_TYPE_PACKAGE:

            status =
                acpi_ut_copy_iobject_to_iobject(actual_src_desc, &dest_desc,
                                        walk_state);
            break;

      default:
            /*
             * All other types come here.
             */
            ACPI_WARNING((AE_INFO, "Store into type %s not implemented",
                        acpi_ut_get_object_type_name(dest_desc)));

            status = AE_NOT_IMPLEMENTED;
            break;
      }

      if (actual_src_desc != source_desc) {

            /* Delete the intermediate (temporary) source object */

            acpi_ut_remove_reference(actual_src_desc);
      }

      *new_desc = dest_desc;
      return_ACPI_STATUS(status);
}

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