text: /******************************************************************************
   *
   * Module Name: exstoren - AML Interpreter object store support,
   *                        Store to Node (namespace object)
   *
   *****************************************************************************/
  
  /*
   * Copyright (C) 2000 - 2015, 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 "acinterp.h"
  #include "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 (source_desc->common.type == 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 ((source_desc->common.type != ACPI_TYPE_INTEGER) &&
  		    (source_desc->common.type != ACPI_TYPE_BUFFER) &&
  		    (source_desc->common.type != ACPI_TYPE_STRING) &&
  		    !((source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
  		      (source_desc->reference.class == ACPI_REFCLASS_TABLE))) {
  
  			/* 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 (source_desc->common.type != dest_desc->common.type) {
  		/*
  		 * 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(dest_desc->common.type,
  							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 (dest_desc->common.type) {
  	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 */
  
  		(void)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);
  }
  