exstore.c

linux-2.6.15.6

	case AML_INDEX_OP:

		/* Storing to an Index (pointer into a packager or buffer) */

		status =
		    acpi_ex_store_object_to_index(source_desc, ref_desc,
						  walk_state);
		break;

	case AML_LOCAL_OP:
	case AML_ARG_OP:

		/* Store to a method local/arg  */

		status =
		    acpi_ds_store_object_to_local(ref_desc->reference.opcode,
						  ref_desc->reference.offset,
						  source_desc, walk_state);
		break;

	case AML_DEBUG_OP:

		/*
		 * Storing to the Debug object causes the value stored to be
		 * displayed and otherwise has no effect -- see ACPI Specification
		 */
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "**** Write to Debug Object: Object %p %s ****:\n\n",
				  source_desc,
				  acpi_ut_get_object_type_name(source_desc)));

		acpi_ex_do_debug_object(source_desc, 0, 0);
		break;

	default:

		ACPI_REPORT_ERROR(("ex_store: Unknown Reference opcode %X\n",
				   ref_desc->reference.opcode));
		ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_ERROR);

		status = AE_AML_INTERNAL;
		break;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_object_to_index
 *
 * PARAMETERS:  *source_desc            - Value to be stored
 *              *dest_desc              - Named object to receive the value
 *              walk_state              - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to indexed Buffer or Package element
 *
 ******************************************************************************/

static acpi_status
acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
			      union acpi_operand_object *index_desc,
			      struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *new_desc;
	u8 value = 0;
	u32 i;

	ACPI_FUNCTION_TRACE("ex_store_object_to_index");

	/*
	 * Destination must be a reference pointer, and
	 * must point to either a buffer or a package
	 */
	switch (index_desc->reference.target_type) {
	case ACPI_TYPE_PACKAGE:
		/*
		 * Storing to a package element. Copy the object and replace
		 * any existing object with the new object. No implicit
		 * conversion is performed.
		 *
		 * The object at *(index_desc->Reference.Where) is the
		 * element within the package that is to be modified.
		 * The parent package object is at index_desc->Reference.Object
		 */
		obj_desc = *(index_desc->reference.where);

		status =
		    acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc,
						    walk_state);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		if (obj_desc) {
			/* Decrement reference count by the ref count of the parent package */

			for (i = 0; i < ((union acpi_operand_object *)
					 index_desc->reference.object)->common.
			     reference_count; i++) {
				acpi_ut_remove_reference(obj_desc);
			}
		}

		*(index_desc->reference.where) = new_desc;

		/* Increment ref count by the ref count of the parent package-1 */

		for (i = 1; i < ((union acpi_operand_object *)
				 index_desc->reference.object)->common.
		     reference_count; i++) {
			acpi_ut_add_reference(new_desc);
		}

		break;

	case ACPI_TYPE_BUFFER_FIELD:

		/*
		 * Store into a Buffer or String (not actually a real buffer_field)
		 * at a location defined by an Index.
		 *
		 * The first 8-bit element of the source object is written to the
		 * 8-bit Buffer location defined by the Index destination object,
		 * according to the ACPI 2.0 specification.
		 */

		/*
		 * Make sure the target is a Buffer or String. An error should
		 * not happen here, since the reference_object was constructed
		 * by the INDEX_OP code.
		 */
		obj_desc = index_desc->reference.object;
		if ((ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_BUFFER) &&
		    (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_STRING)) {
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/*
		 * The assignment of the individual elements will be slightly
		 * different for each source type.
		 */
		switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
		case ACPI_TYPE_INTEGER:

			/* Use the least-significant byte of the integer */

			value = (u8) (source_desc->integer.value);
			break;

		case ACPI_TYPE_BUFFER:
		case ACPI_TYPE_STRING:

			/* Note: Takes advantage of common string/buffer fields */

			value = source_desc->buffer.pointer[0];
			break;

		default:

			/* All other types are invalid */

			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					  "Source must be Integer/Buffer/String type, not %s\n",
					  acpi_ut_get_object_type_name
					  (source_desc)));
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/* Store the source value into the target buffer byte */

		obj_desc->buffer.pointer[index_desc->reference.offset] = value;
		break;

	default:
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Target is not a Package or buffer_field\n"));
		status = AE_AML_OPERAND_TYPE;
		break;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_object_to_node
 *
 * PARAMETERS:  source_desc             - Value to be stored
 *              Node                    - Named object to receive the value
 *              walk_state              - Current walk state
 *              implicit_conversion     - Perform implicit conversion (yes/no)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to the named object.
 *
 *              The Assignment of an object to a named object is handled here
 *              The value 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.
 *
 *              Assumes parameters are already validated.
 *
 ******************************************************************************/

acpi_status
acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
			     struct acpi_namespace_node *node,
			     struct acpi_walk_state *walk_state,
			     u8 implicit_conversion)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *target_desc;
	union acpi_operand_object *new_desc;
	acpi_object_type target_type;

	ACPI_FUNCTION_TRACE_PTR("ex_store_object_to_node", source_desc);

	/* Get current type of the node, and object attached to Node */

	target_type = acpi_ns_get_type(node);
	target_desc = acpi_ns_get_attached_object(node);

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
			  source_desc,
			  acpi_ut_get_object_type_name(source_desc), node,
			  acpi_ut_get_type_name(target_type)));

	/*
	 * Resolve the source object to an actual value
	 * (If it is a reference object)
	 */
	status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* If no implicit conversion, drop into the default case below */

	if ((!implicit_conversion) || (walk_state->opcode == AML_COPY_OP)) {
		/* Force execution of default (no implicit conversion) */

		target_type = ACPI_TYPE_ANY;
	}

	/* Do the actual store operation */

	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:

		/* For fields, copy the source data to the target field. */

		status = acpi_ex_write_data_to_field(source_desc, target_desc,
						     &walk_state->result_obj);
		break;

	case ACPI_TYPE_INTEGER:
	case ACPI_TYPE_STRING:
	case ACPI_TYPE_BUFFER:

		/*
		 * These target types are all of type Integer/String/Buffer, and
		 * therefore support implicit conversion before the store.
		 *
		 * Copy and/or convert the source object to a new target object
		 */
		status =
		    acpi_ex_store_object_to_object(source_desc, target_desc,
						   &new_desc, walk_state);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		if (new_desc != target_desc) {
			/*
			 * Store the new new_desc as the new value of the Name, and set
			 * the Name's type to that of the value being stored in it.
			 * source_desc reference count is incremented by attach_object.
			 *
			 * Note: This may change the type of the node if an explicit store
			 * has been performed such that the node/object type has been
			 * changed.
			 */
			status =
			    acpi_ns_attach_object(node, new_desc,
						  new_desc->common.type);

			ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
					  "Store %s into %s via Convert/Attach\n",
					  acpi_ut_get_object_type_name
					  (source_desc),
					  acpi_ut_get_object_type_name
					  (new_desc)));
		}
		break;

	default:

		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
				  acpi_ut_get_object_type_name(source_desc),
				  source_desc, node));

		/* No conversions for all other types.  Just attach the source object */

		status = acpi_ns_attach_object(node, source_desc,
					       ACPI_GET_OBJECT_TYPE
					       (source_desc));
		break;
	}

	return_ACPI_STATUS(status);
}