e8707b340f
Validates predefined ACPI objects that appear in the namespace, at the time they are evaluated. The argument count and the type of the returned object are validated. The purpose of this validation is to detect problems with the BIOS-exposed predefined ACPI objects before the results are returned to the ACPI-related drivers. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
319 lines
10 KiB
C
319 lines
10 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 - 2008, 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 <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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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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/*
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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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/*
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* Calculate the number of arguments being passed to the method
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*/
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info->param_count = 0;
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if (info->parameters) {
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while (info->parameters[info->param_count])
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info->param_count++;
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}
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/*
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* Warning if too few or too many arguments have been passed by the
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* caller. We don't want to abort here with an error because an
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* incorrect number of arguments may not cause the method to fail.
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* However, the method will fail if there are too few arguments passed
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* and the method attempts to use one of the missing ones.
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*/
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if (info->param_count < info->obj_desc->method.param_count) {
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ACPI_WARNING((AE_INFO,
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"Insufficient arguments - "
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"method [%4.4s] needs %d, found %d",
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acpi_ut_get_node_name(info->resolved_node),
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info->obj_desc->method.param_count,
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info->param_count));
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} else if (info->param_count >
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info->obj_desc->method.param_count) {
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ACPI_WARNING((AE_INFO,
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"Excess arguments - "
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"method [%4.4s] needs %d, found %d",
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acpi_ut_get_node_name(info->
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resolved_node),
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info->obj_desc->method.param_count,
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info->param_count));
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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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* 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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/* Validation of return values for ACPI-predefined methods and objects */
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if ((status == AE_OK) || (status == AE_CTRL_RETURN_VALUE)) {
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/*
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* If this is the first evaluation, check the return value. This
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* ensures that any warnings will only be emitted during the very
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* first evaluation of the object.
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*/
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if (!(node->flags & ANOBJ_EVALUATED)) {
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/*
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* Check for a predefined ACPI name. If found, validate the
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* returned object.
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*
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* Note: Ignore return status for now, emit warnings if there are
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* problems with the returned object. May change later to abort
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* the method on invalid return object.
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*/
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(void)acpi_ns_check_predefined_names(node,
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info->
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return_object);
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}
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/* Mark the node as having been evaluated */
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node->flags |= ANOBJ_EVALUATED;
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}
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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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