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/*******************************************************************************

 *

 * Module Name: nseval - Object evaluation, includes control method execution

 *

 ******************************************************************************/

/*

 * 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/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);

}