dsobject.c

h内核

	/*
	 * Allocate the pointer array (array of pointers to the
	 * individual objects). Add an extra pointer slot so
	 * that the list is always null terminated.
	 */
	obj_desc->package.elements = ACPI_MEM_CALLOCATE (
			 ((acpi_size) obj_desc->package.count + 1) * sizeof (void *));

	if (!obj_desc->package.elements) {
		acpi_ut_delete_object_desc (obj_desc);
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	/*
	 * Now init the elements of the package
	 */
	i = 0;
	arg = op->common.value.arg;
	arg = arg->common.next;
	while (arg) {
		if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
			/* Object (package or buffer) is already built */

			obj_desc->package.elements[i] = ACPI_CAST_PTR (union acpi_operand_object, arg->common.node);
		}
		else {
			status = acpi_ds_build_internal_object (walk_state, arg,
					  &obj_desc->package.elements[i]);
		}

		i++;
		arg = arg->common.next;
	}

	obj_desc->package.flags |= AOPOBJ_DATA_VALID;
	op->common.node = (struct acpi_namespace_node *) obj_desc;
	return_ACPI_STATUS (status);
}


/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_create_node
 *
 * PARAMETERS:  walk_state      - Current walk state
 *              Node            - NS Node to be initialized
 *              Op              - Parser object to be translated
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create the object to be associated with a namespace node
 *
 ****************************************************************************/

acpi_status
acpi_ds_create_node (
	struct acpi_walk_state          *walk_state,
	struct acpi_namespace_node      *node,
	union acpi_parse_object         *op)
{
	acpi_status                     status;
	union acpi_operand_object       *obj_desc;


	ACPI_FUNCTION_TRACE_PTR ("ds_create_node", op);


	/*
	 * Because of the execution pass through the non-control-method
	 * parts of the table, we can arrive here twice.  Only init
	 * the named object node the first time through
	 */
	if (acpi_ns_get_attached_object (node)) {
		return_ACPI_STATUS (AE_OK);
	}

	if (!op->common.value.arg) {
		/* No arguments, there is nothing to do */

		return_ACPI_STATUS (AE_OK);
	}

	/* Build an internal object for the argument(s) */

	status = acpi_ds_build_internal_object (walk_state, op->common.value.arg, &obj_desc);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/* Re-type the object according to its argument */

	node->type = ACPI_GET_OBJECT_TYPE (obj_desc);

	/* Attach obj to node */

	status = acpi_ns_attach_object (node, obj_desc, node->type);

	/* Remove local reference to the object */

	acpi_ut_remove_reference (obj_desc);
	return_ACPI_STATUS (status);
}

#endif /* ACPI_NO_METHOD_EXECUTION */


/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_init_object_from_op
 *
 * PARAMETERS:  walk_state      - Current walk state
 *              Op              - Parser op used to init the internal object
 *              Opcode          - AML opcode associated with the object
 *              ret_obj_desc    - Namespace object to be initialized
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize a namespace object from a parser Op and its
 *              associated arguments.  The namespace object is a more compact
 *              representation of the Op and its arguments.
 *
 ****************************************************************************/

acpi_status
acpi_ds_init_object_from_op (
	struct acpi_walk_state          *walk_state,
	union acpi_parse_object         *op,
	u16                             opcode,
	union acpi_operand_object       **ret_obj_desc)
{
	const struct acpi_opcode_info   *op_info;
	union acpi_operand_object       *obj_desc;
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE ("ds_init_object_from_op");


	obj_desc = *ret_obj_desc;
	op_info = acpi_ps_get_opcode_info (opcode);
	if (op_info->class == AML_CLASS_UNKNOWN) {
		/* Unknown opcode */

		return_ACPI_STATUS (AE_TYPE);
	}

	/* Perform per-object initialization */

	switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
	case ACPI_TYPE_BUFFER:

		/*
		 * Defer evaluation of Buffer term_arg operand
		 */
		obj_desc->buffer.node     = (struct acpi_namespace_node *) walk_state->operands[0];
		obj_desc->buffer.aml_start = op->named.data;
		obj_desc->buffer.aml_length = op->named.length;
		break;


	case ACPI_TYPE_PACKAGE:

		/*
		 * Defer evaluation of Package term_arg operand
		 */
		obj_desc->package.node     = (struct acpi_namespace_node *) walk_state->operands[0];
		obj_desc->package.aml_start = op->named.data;
		obj_desc->package.aml_length = op->named.length;
		break;


	case ACPI_TYPE_INTEGER:

		switch (op_info->type) {
		case AML_TYPE_CONSTANT:
			/*
			 * Resolve AML Constants here - AND ONLY HERE!
			 * All constants are integers.
			 * We mark the integer with a flag that indicates that it started life
			 * as a constant -- so that stores to constants will perform as expected (noop).
			 * (zero_op is used as a placeholder for optional target operands.)
			 */
			obj_desc->common.flags = AOPOBJ_AML_CONSTANT;

			switch (opcode) {
			case AML_ZERO_OP:

				obj_desc->integer.value = 0;
				break;

			case AML_ONE_OP:

				obj_desc->integer.value = 1;
				break;

			case AML_ONES_OP:

				obj_desc->integer.value = ACPI_INTEGER_MAX;

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

#ifndef ACPI_NO_METHOD_EXECUTION
				acpi_ex_truncate_for32bit_table (obj_desc);
#endif
				break;

			case AML_REVISION_OP:

				obj_desc->integer.value = ACPI_CA_VERSION;
				break;

			default:

				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown constant opcode %X\n", opcode));
				status = AE_AML_OPERAND_TYPE;
				break;
			}
			break;


		case AML_TYPE_LITERAL:

			obj_desc->integer.value = op->common.value.integer;
			break;


		default:
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Integer type %X\n", op_info->type));
			status = AE_AML_OPERAND_TYPE;
			break;
		}
		break;


	case ACPI_TYPE_STRING:

		obj_desc->string.pointer = op->common.value.string;
		obj_desc->string.length = (u32) ACPI_STRLEN (op->common.value.string);

		/*
		 * The string is contained in the ACPI table, don't ever try
		 * to delete it
		 */
		obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
		break;


	case ACPI_TYPE_METHOD:
		break;


	case ACPI_TYPE_LOCAL_REFERENCE:

		switch (op_info->type) {
		case AML_TYPE_LOCAL_VARIABLE:

			/* Split the opcode into a base opcode + offset */

			obj_desc->reference.opcode = AML_LOCAL_OP;
			obj_desc->reference.offset = opcode - AML_LOCAL_OP;

#ifndef ACPI_NO_METHOD_EXECUTION
			status = acpi_ds_method_data_get_node (AML_LOCAL_OP, obj_desc->reference.offset,
					 walk_state, (struct acpi_namespace_node **) &obj_desc->reference.object);
#endif
			break;


		case AML_TYPE_METHOD_ARGUMENT:

			/* Split the opcode into a base opcode + offset */

			obj_desc->reference.opcode = AML_ARG_OP;
			obj_desc->reference.offset = opcode - AML_ARG_OP;

#ifndef ACPI_NO_METHOD_EXECUTION
			status = acpi_ds_method_data_get_node (AML_ARG_OP, obj_desc->reference.offset,
					 walk_state, (struct acpi_namespace_node **) &obj_desc->reference.object);
#endif
			break;

		default: /* Other literals, etc.. */

			if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
				/* Node was saved in Op */

				obj_desc->reference.node = op->common.node;
			}

			obj_desc->reference.opcode = opcode;
			break;
		}
		break;


	default:

		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unimplemented data type: %X\n",
			ACPI_GET_OBJECT_TYPE (obj_desc)));

		status = AE_AML_OPERAND_TYPE;
		break;
	}

	return_ACPI_STATUS (status);
}