454 lines
14 KiB
C
454 lines
14 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 - 2012, Intel Corp.
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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 "accommon.h"
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#include "acparser.h"
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#include "acinterp.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nseval")
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/* Local prototypes */
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static void
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acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
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struct acpi_evaluate_info *info);
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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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struct acpi_namespace_node *node;
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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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info->param_count = 0;
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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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node = 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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/* Count the number of arguments being passed to the method */
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if (info->parameters) {
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while (info->parameters[info->param_count]) {
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if (info->param_count > ACPI_METHOD_MAX_ARG) {
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return_ACPI_STATUS(AE_LIMIT);
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}
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info->param_count++;
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}
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}
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ACPI_DUMP_PATHNAME(info->resolved_node, "ACPI: 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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* Disallow certain object types. For these, "evaluation" is undefined.
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*/
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switch (info->resolved_node->type) {
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case ACPI_TYPE_DEVICE:
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case ACPI_TYPE_EVENT:
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case ACPI_TYPE_MUTEX:
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case ACPI_TYPE_REGION:
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case ACPI_TYPE_THERMAL:
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case ACPI_TYPE_LOCAL_SCOPE:
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ACPI_ERROR((AE_INFO,
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"[%4.4s] Evaluation of object type [%s] is not supported",
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info->resolved_node->name.ascii,
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acpi_ut_get_type_name(info->resolved_node->
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type)));
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return_ACPI_STATUS(AE_TYPE);
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default:
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break;
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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 input argument count against the ASL-defined count for a method.
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* Also check predefined names: argument count and return value against
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* the ACPI specification. Some incorrect return value types are repaired.
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*/
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(void)acpi_ns_check_predefined_names(node, info->param_count,
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status, &info->return_object);
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/* Check if there is a return value that must be dealt with */
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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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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_exec_module_code_list
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*
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* PARAMETERS: None
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*
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* RETURN: None. Exceptions during method execution are ignored, since
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* we cannot abort a table load.
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*
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* DESCRIPTION: Execute all elements of the global module-level code list.
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* Each element is executed as a single control method.
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*
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******************************************************************************/
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void acpi_ns_exec_module_code_list(void)
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{
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union acpi_operand_object *prev;
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union acpi_operand_object *next;
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struct acpi_evaluate_info *info;
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u32 method_count = 0;
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ACPI_FUNCTION_TRACE(ns_exec_module_code_list);
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/* Exit now if the list is empty */
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next = acpi_gbl_module_code_list;
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if (!next) {
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return_VOID;
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}
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/* Allocate the evaluation information block */
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info = ACPI_ALLOCATE(sizeof(struct acpi_evaluate_info));
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if (!info) {
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return_VOID;
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}
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/* Walk the list, executing each "method" */
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while (next) {
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prev = next;
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next = next->method.mutex;
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/* Clear the link field and execute the method */
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prev->method.mutex = NULL;
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acpi_ns_exec_module_code(prev, info);
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method_count++;
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/* Delete the (temporary) method object */
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acpi_ut_remove_reference(prev);
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}
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ACPI_INFO((AE_INFO,
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"Executed %u blocks of module-level executable AML code",
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method_count));
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ACPI_FREE(info);
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acpi_gbl_module_code_list = NULL;
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_exec_module_code
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*
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* PARAMETERS: method_obj - Object container for the module-level code
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* info - Info block for method evaluation
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*
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* RETURN: None. Exceptions during method execution are ignored, since
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* we cannot abort a table load.
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*
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* DESCRIPTION: Execute a control method containing a block of module-level
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* executable AML code. The control method is temporarily
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* installed to the root node, then evaluated.
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*
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******************************************************************************/
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static void
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acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
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struct acpi_evaluate_info *info)
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{
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union acpi_operand_object *parent_obj;
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struct acpi_namespace_node *parent_node;
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acpi_object_type type;
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acpi_status status;
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ACPI_FUNCTION_TRACE(ns_exec_module_code);
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/*
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* Get the parent node. We cheat by using the next_object field
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* of the method object descriptor.
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*/
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parent_node = ACPI_CAST_PTR(struct acpi_namespace_node,
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method_obj->method.next_object);
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type = acpi_ns_get_type(parent_node);
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/*
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* Get the region handler and save it in the method object. We may need
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* this if an operation region declaration causes a _REG method to be run.
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*
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* We can't do this in acpi_ps_link_module_code because
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* acpi_gbl_root_node->Object is NULL at PASS1.
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*/
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if ((type == ACPI_TYPE_DEVICE) && parent_node->object) {
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method_obj->method.dispatch.handler =
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parent_node->object->device.handler;
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}
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/* Must clear next_object (acpi_ns_attach_object needs the field) */
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method_obj->method.next_object = NULL;
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/* Initialize the evaluation information block */
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ACPI_MEMSET(info, 0, sizeof(struct acpi_evaluate_info));
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info->prefix_node = parent_node;
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/*
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* Get the currently attached parent object. Add a reference, because the
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* ref count will be decreased when the method object is installed to
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* the parent node.
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*/
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parent_obj = acpi_ns_get_attached_object(parent_node);
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if (parent_obj) {
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acpi_ut_add_reference(parent_obj);
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}
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/* Install the method (module-level code) in the parent node */
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status = acpi_ns_attach_object(parent_node, method_obj,
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ACPI_TYPE_METHOD);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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/* Execute the parent node as a control method */
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status = acpi_ns_evaluate(info);
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ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Executed module-level code at %p\n",
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method_obj->method.aml_start));
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/* Delete a possible implicit return value (in slack mode) */
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if (info->return_object) {
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acpi_ut_remove_reference(info->return_object);
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}
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/* Detach the temporary method object */
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acpi_ns_detach_object(parent_node);
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/* Restore the original parent object */
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if (parent_obj) {
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status = acpi_ns_attach_object(parent_node, parent_obj, type);
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} else {
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parent_node->type = (u8)type;
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}
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exit:
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if (parent_obj) {
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acpi_ut_remove_reference(parent_obj);
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}
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return_VOID;
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}
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