234 lines
7.9 KiB
C
234 lines
7.9 KiB
C
/*******************************************************************************
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*
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* Module Name: nseval - Object evaluation, includes control method execution
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2007, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acparser.h>
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#include <acpi/acinterp.h>
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#include <acpi/acnamesp.h>
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nseval")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_evaluate
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*
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* PARAMETERS: Info - Evaluation info block, contains:
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* prefix_node - Prefix or Method/Object Node to execute
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* Pathname - Name of method to execute, If NULL, the
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* Node is the object to execute
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* Parameters - List of parameters to pass to the method,
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* terminated by NULL. Params itself may be
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* NULL if no parameters are being passed.
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* return_object - Where to put method's return value (if
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* any). If NULL, no value is returned.
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* parameter_type - Type of Parameter list
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* return_object - Where to put method's return value (if
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* any). If NULL, no value is returned.
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* Flags - ACPI_IGNORE_RETURN_VALUE to delete return
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute a control method or return the current value of an
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* ACPI namespace object.
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*
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* MUTEX: Locks interpreter
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*
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******************************************************************************/
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acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ns_evaluate);
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if (!info) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Initialize the return value to an invalid object */
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info->return_object = NULL;
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/*
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* Get the actual namespace node for the target object. Handles these cases:
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*
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* 1) Null node, Pathname (absolute path)
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* 2) Node, Pathname (path relative to Node)
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* 3) Node, Null Pathname
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*/
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status = acpi_ns_get_node(info->prefix_node, info->pathname,
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ACPI_NS_NO_UPSEARCH, &info->resolved_node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/*
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* For a method alias, we must grab the actual method node so that proper
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* scoping context will be established before execution.
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*/
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if (acpi_ns_get_type(info->resolved_node) ==
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ACPI_TYPE_LOCAL_METHOD_ALIAS) {
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info->resolved_node =
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ACPI_CAST_PTR(struct acpi_namespace_node,
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info->resolved_node->object);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", info->pathname,
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info->resolved_node,
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acpi_ns_get_attached_object(info->resolved_node)));
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/*
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* Two major cases here:
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*
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* 1) The object is a control method -- execute it
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* 2) The object is not a method -- just return it's current value
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*/
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if (acpi_ns_get_type(info->resolved_node) == ACPI_TYPE_METHOD) {
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/*
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* 1) Object is a control method - execute it
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*/
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/* Verify that there is a method object associated with this node */
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info->obj_desc =
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acpi_ns_get_attached_object(info->resolved_node);
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if (!info->obj_desc) {
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ACPI_ERROR((AE_INFO,
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"Control method has no attached sub-object"));
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return_ACPI_STATUS(AE_NULL_OBJECT);
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}
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ACPI_DUMP_PATHNAME(info->resolved_node, "Execute Method:",
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ACPI_LV_INFO, _COMPONENT);
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Method at AML address %p Length %X\n",
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info->obj_desc->method.aml_start + 1,
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info->obj_desc->method.aml_length - 1));
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/*
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* Any namespace deletion must acquire both the namespace and
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* interpreter locks to ensure that no thread is using the portion of
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* the namespace that is being deleted.
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*
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* Execute the method via the interpreter. The interpreter is locked
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* here before calling into the AML parser
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*/
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acpi_ex_enter_interpreter();
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status = acpi_ps_execute_method(info);
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acpi_ex_exit_interpreter();
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} else {
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/*
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* 2) Object is not a method, return its current value
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*/
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/*
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* Objects require additional resolution steps (e.g., the Node may be
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* a field that must be read, etc.) -- we can't just grab the object
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* out of the node.
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*
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* Use resolve_node_to_value() to get the associated value.
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*
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* NOTE: we can get away with passing in NULL for a walk state because
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* resolved_node is guaranteed to not be a reference to either a method
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* local or a method argument (because this interface is never called
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* from a running method.)
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*
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* Even though we do not directly invoke the interpreter for object
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* resolution, we must lock it because we could access an opregion.
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* The opregion access code assumes that the interpreter is locked.
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*/
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acpi_ex_enter_interpreter();
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/* Function has a strange interface */
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status =
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acpi_ex_resolve_node_to_value(&info->resolved_node, NULL);
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acpi_ex_exit_interpreter();
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/*
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* If acpi_ex_resolve_node_to_value() succeeded, the return value was placed
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* in resolved_node.
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*/
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if (ACPI_SUCCESS(status)) {
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status = AE_CTRL_RETURN_VALUE;
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info->return_object =
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ACPI_CAST_PTR(union acpi_operand_object,
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info->resolved_node);
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"Returning object %p [%s]\n",
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info->return_object,
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acpi_ut_get_object_type_name(info->
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return_object)));
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}
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}
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/*
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* Check if there is a return value that must be dealt with
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*/
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if (status == AE_CTRL_RETURN_VALUE) {
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/* If caller does not want the return value, delete it */
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if (info->flags & ACPI_IGNORE_RETURN_VALUE) {
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acpi_ut_remove_reference(info->return_object);
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info->return_object = NULL;
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}
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/* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
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status = AE_OK;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"*** Completed evaluation of object %s ***\n",
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info->pathname));
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/*
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* Namespace was unlocked by the handling acpi_ns* function, so we
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* just return
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*/
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return_ACPI_STATUS(status);
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}
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