/******************************************************************************* * * Module Name: nseval - Object evaluation, includes control method execution * ******************************************************************************/ /* * Copyright (C) 2000 - 2006, 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/acparser.h> #include <acpi/acinterp.h> #include <acpi/acnamesp.h> #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nseval") /******************************************************************************* * * FUNCTION: acpi_ns_evaluate * * PARAMETERS: Info - Evaluation info block, contains: * prefix_node - Prefix or Method/Object Node to execute * Pathname - Name of method to execute, If NULL, the * Node is the object to execute * Parameters - List of parameters to pass to the method, * terminated by NULL. Params itself may be * NULL if no parameters are being passed. * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * parameter_type - Type of Parameter list * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * Flags - ACPI_IGNORE_RETURN_VALUE to delete return * * RETURN: Status * * DESCRIPTION: Execute a control method or return the current value of an * ACPI namespace object. * * MUTEX: Locks interpreter * ******************************************************************************/ acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info) { acpi_status status; ACPI_FUNCTION_TRACE(ns_evaluate); if (!info) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Initialize the return value to an invalid object */ info->return_object = NULL; /* * Get the actual namespace node for the target object. Handles these cases: * * 1) Null node, Pathname (absolute path) * 2) Node, Pathname (path relative to Node) * 3) Node, Null Pathname */ status = acpi_ns_get_node(info->prefix_node, info->pathname, ACPI_NS_NO_UPSEARCH, &info->resolved_node); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* * For a method alias, we must grab the actual method node so that proper * scoping context will be established before execution. */ if (acpi_ns_get_type(info->resolved_node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) { info->resolved_node = ACPI_CAST_PTR(struct acpi_namespace_node, info->resolved_node->object); } ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", info->pathname, info->resolved_node, acpi_ns_get_attached_object(info->resolved_node))); /* * Two major cases here: * * 1) The object is a control method -- execute it * 2) The object is not a method -- just return it's current value */ if (acpi_ns_get_type(info->resolved_node) == ACPI_TYPE_METHOD) { /* * 1) Object is a control method - execute it */ /* Verify that there is a method object associated with this node */ info->obj_desc = acpi_ns_get_attached_object(info->resolved_node); if (!info->obj_desc) { ACPI_ERROR((AE_INFO, "Control method has no attached sub-object")); return_ACPI_STATUS(AE_NULL_OBJECT); } ACPI_DUMP_PATHNAME(info->resolved_node, "Execute Method:", ACPI_LV_INFO, _COMPONENT); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Method at AML address %p Length %X\n", info->obj_desc->method.aml_start + 1, info->obj_desc->method.aml_length - 1)); /* * Any namespace deletion must acquire both the namespace and * interpreter locks to ensure that no thread is using the portion of * the namespace that is being deleted. * * Execute the method via the interpreter. The interpreter is locked * here before calling into the AML parser */ acpi_ex_enter_interpreter(); status = acpi_ps_execute_method(info); acpi_ex_exit_interpreter(); } else { /* * 2) Object is not a method, return its current value */ /* * Objects require additional resolution steps (e.g., the Node may be * a field that must be read, etc.) -- we can't just grab the object * out of the node. * * Use resolve_node_to_value() to get the associated value. * * NOTE: we can get away with passing in NULL for a walk state because * resolved_node is guaranteed to not be a reference to either a method * local or a method argument (because this interface is never called * from a running method.) * * Even though we do not directly invoke the interpreter for object * resolution, we must lock it because we could access an opregion. * The opregion access code assumes that the interpreter is locked. */ acpi_ex_enter_interpreter(); /* Function has a strange interface */ status = acpi_ex_resolve_node_to_value(&info->resolved_node, NULL); acpi_ex_exit_interpreter(); /* * If acpi_ex_resolve_node_to_value() succeeded, the return value was placed * in resolved_node. */ if (ACPI_SUCCESS(status)) { status = AE_CTRL_RETURN_VALUE; info->return_object = ACPI_CAST_PTR(union acpi_operand_object, info->resolved_node); ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returning object %p [%s]\n", info->return_object, acpi_ut_get_object_type_name(info-> return_object))); } } /* * Check if there is a return value that must be dealt with */ if (status == AE_CTRL_RETURN_VALUE) { /* If caller does not want the return value, delete it */ if (info->flags & ACPI_IGNORE_RETURN_VALUE) { acpi_ut_remove_reference(info->return_object); info->return_object = NULL; } /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */ status = AE_OK; } ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "*** Completed evaluation of object %s ***\n", info->pathname)); /* * Namespace was unlocked by the handling acpi_ns* function, so we * just return */ return_ACPI_STATUS(status); }