307 lines
9.1 KiB
C
307 lines
9.1 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/*******************************************************************************
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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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#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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/*******************************************************************************
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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 these fields
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* and more:
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* prefix_node - Prefix or Method/Object Node to execute
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* relative_path - 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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* 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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if (!info->node) {
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/*
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* Get the actual namespace node for the target object if we
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* need to. Handles these cases:
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*
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* 1) Null node, valid pathname from root (absolute path)
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* 2) Node and valid pathname (path relative to Node)
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* 3) Node, Null pathname
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*/
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status =
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acpi_ns_get_node(info->prefix_node, info->relative_pathname,
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ACPI_NS_NO_UPSEARCH, &info->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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/*
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* For a method alias, we must grab the actual method node so that
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* proper scoping context will be established before execution.
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*/
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if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
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info->node =
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ACPI_CAST_PTR(struct acpi_namespace_node,
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info->node->object);
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}
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/* Complete the info block initialization */
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info->return_object = NULL;
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info->node_flags = info->node->flags;
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info->obj_desc = acpi_ns_get_attached_object(info->node);
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
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info->relative_pathname, info->node,
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acpi_ns_get_attached_object(info->node)));
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/* Get info if we have a predefined name (_HID, etc.) */
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info->predefined =
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acpi_ut_match_predefined_method(info->node->name.ascii);
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/* Get the full pathname to the object, for use in warning messages */
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info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE);
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if (!info->full_pathname) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Optional object evaluation log */
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
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"%-26s: %s (%s)\n", " Enter evaluation",
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&info->full_pathname[1],
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acpi_ut_get_type_name(info->node->type)));
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/* Count the number of arguments being passed in */
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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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/* Warn on impossible argument count */
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if (info->param_count > ACPI_METHOD_NUM_ARGS) {
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ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
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ACPI_WARN_ALWAYS,
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"Excess arguments (%u) - using only %u",
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info->param_count,
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ACPI_METHOD_NUM_ARGS));
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info->param_count = ACPI_METHOD_NUM_ARGS;
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}
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}
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/*
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* For predefined names: Check that the declared argument count
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* matches the ACPI spec -- otherwise this is a BIOS error.
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*/
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acpi_ns_check_acpi_compliance(info->full_pathname, info->node,
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info->predefined);
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/*
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* For all names: Check that the incoming argument count for
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* this method/object matches the actual ASL/AML definition.
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*/
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acpi_ns_check_argument_count(info->full_pathname, info->node,
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info->param_count, info->predefined);
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/* For predefined names: Typecheck all incoming arguments */
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acpi_ns_check_argument_types(info);
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/*
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* Three major evaluation cases:
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*
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* 1) Object types that cannot be evaluated by definition
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* 2) The object is a control method -- execute it
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* 3) The object is not a method -- just return it's current value
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*/
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switch (acpi_ns_get_type(info->node)) {
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case ACPI_TYPE_ANY:
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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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/*
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* 1) Disallow evaluation of these object types. For these,
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* object evaluation is undefined.
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*/
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ACPI_ERROR((AE_INFO,
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"%s: This object type [%s] "
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"never contains data and cannot be evaluated",
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info->full_pathname,
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acpi_ut_get_type_name(info->node->type)));
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status = AE_TYPE;
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goto cleanup;
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case ACPI_TYPE_METHOD:
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/*
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* 2) 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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if (!info->obj_desc) {
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ACPI_ERROR((AE_INFO,
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"%s: Method has no attached sub-object",
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info->full_pathname));
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status = AE_NULL_OBJECT;
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goto cleanup;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"**** Execute method [%s] at AML address %p length %X\n",
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info->full_pathname,
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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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break;
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default:
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/*
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* 3) All other non-method objects -- get the current object value
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*/
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/*
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* Some objects require additional resolution steps (e.g., the Node
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* may be a field that must be read, etc.) -- we can't just grab
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* the object 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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* the 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 op_region.
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* The op_region access code assumes that the interpreter is locked.
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*/
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acpi_ex_enter_interpreter();
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/* TBD: resolve_node_to_value has a strange interface, fix */
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info->return_object =
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ACPI_CAST_PTR(union acpi_operand_object, info->node);
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status =
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acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
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(struct acpi_namespace_node,
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&info->return_object), NULL);
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acpi_ex_exit_interpreter();
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if (ACPI_FAILURE(status)) {
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info->return_object = NULL;
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goto cleanup;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returned 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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status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
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break;
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}
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/*
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* For predefined names, check the return value against the ACPI
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* specification. Some incorrect return value types are repaired.
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*/
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(void)acpi_ns_check_return_value(info->node, info, 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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} else if (ACPI_FAILURE(status)) {
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/* If return_object exists, delete it */
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if (info->return_object) {
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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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}
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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->relative_pathname));
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cleanup:
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/* Optional object evaluation log */
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
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"%-26s: %s\n", " Exit evaluation",
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&info->full_pathname[1]));
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/*
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* Namespace was unlocked by the handling acpi_ns* function, so we
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* just free the pathname and return
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*/
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ACPI_FREE(info->full_pathname);
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info->full_pathname = NULL;
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return_ACPI_STATUS(status);
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}
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