// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: nspredef - Validation of ACPI predefined methods and objects
*
* Copyright (C) 2000 - 2025, Intel Corp.
*
*****************************************************************************/
#define ACPI_CREATE_PREDEFINED_TABLE
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acpredef.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME(
"nspredef")
/*******************************************************************************
*
* This module validates predefined ACPI objects that appear in the namespace,
* at the time they are evaluated (via acpi_evaluate_object). The purpose of this
* validation is to detect problems with BIOS-exposed predefined ACPI objects
* before the results are returned to the ACPI-related drivers.
*
* There are several areas that are validated:
*
* 1) The number of input arguments as defined by the method/object in the
* ASL is validated against the ACPI specification.
* 2) The type of the return object (if any) is validated against the ACPI
* specification.
* 3) For returned package objects, the count of package elements is
* validated, as well as the type of each package element. Nested
* packages are supported.
*
* For any problems found, a warning message is issued.
*
******************************************************************************/
/* Local prototypes */
static acpi_status
acpi_ns_check_reference(
struct acpi_evaluate_info *info,
union acpi_operand_object *return_object);
static u32 acpi_ns_get_bitmapped_type(
union acpi_operand_object *return_object);
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_return_value
*
* PARAMETERS: node - Namespace node for the method/object
* info - Method execution information block
* user_param_count - Number of parameters actually passed
* return_status - Status from the object evaluation
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status
*
* DESCRIPTION: Check the value returned from a predefined name.
*
******************************************************************************/
acpi_status
acpi_ns_check_return_value(
struct acpi_namespace_node *node,
struct acpi_evaluate_info *info,
u32 user_param_count,
acpi_status return_status,
union acpi_operand_object **return_object_ptr)
{
acpi_status status;
const union acpi_predefined_info *predefined;
ACPI_FUNCTION_TRACE(ns_check_return_value);
/* If not a predefined name, we cannot validate the return object */
predefined = info->predefined;
if (!predefined) {
return_ACPI_STATUS(AE_OK);
}
/*
* If the method failed or did not actually return an object, we cannot
* validate the return object
*/
if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
return_ACPI_STATUS(AE_OK);
}
/*
* Return value validation and possible repair.
*
* 1) Don't perform return value validation/repair if this feature
* has been disabled via a global option.
*
* 2) We have a return value, but if one wasn't expected, just exit,
* this is not a problem. For example, if the "Implicit Return"
* feature is enabled, methods will always return a value.
*
* 3) If the return value can be of any type, then we cannot perform
* any validation, just exit.
*/
if (acpi_gbl_disable_auto_repair ||
(!predefined->info.expected_btypes) ||
(predefined->info.expected_btypes == ACPI_RTYPE_ALL)) {
return_ACPI_STATUS(AE_OK);
}
/*
* Check that the type of the main return object is what is expected
* for this predefined name
*/
status = acpi_ns_check_object_type(info, return_object_ptr,
predefined->info.expected_btypes,
ACPI_NOT_PACKAGE_ELEMENT);
if (ACPI_FAILURE(status)) {
goto exit;
}
/*
*
* 4) If there is no return value and it is optional, just return
* AE_OK (_WAK).
*/
if (!(*return_object_ptr)) {
goto exit;
}
/*
* For returned Package objects, check the type of all sub-objects.
* Note: Package may have been newly created by call above.
*/
if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) {
info->parent_package = *return_object_ptr;
status = acpi_ns_check_package(info, return_object_ptr);
if (ACPI_FAILURE(status)) {
/* We might be able to fix some errors */
if ((status != AE_AML_OPERAND_TYPE) &&
(status != AE_AML_OPERAND_VALUE)) {
goto exit;
}
}
}
/*
* The return object was OK, or it was successfully repaired above.
* Now make some additional checks such as verifying that package
* objects are sorted correctly (if required) or buffer objects have
* the correct data width (bytes vs. dwords). These repairs are
* performed on a per-name basis, i.e., the code is specific to
* particular predefined names.
*/
status = acpi_ns_complex_repairs(info, node, status, return_object_ptr);
exit:
/*
* If the object validation failed or if we successfully repaired one
* or more objects, mark the parent node to suppress further warning
* messages during the next evaluation of the same method/object.
*/
if (ACPI_FAILURE(status) || (info->return_flags & ACPI_OBJECT_REPAIRED)) {
node->flags |= ANOBJ_EVALUATED;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_object_type
*
* PARAMETERS: info - Method execution information block
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
* expected_btypes - Bitmap of expected return type(s)
* package_index - Index of object within parent package (if
* applicable - ACPI_NOT_PACKAGE_ELEMENT
* otherwise)
*
* RETURN: Status
*
* DESCRIPTION: Check the type of the return object against the expected object
* type(s). Use of Btype allows multiple expected object types.
*
******************************************************************************/
acpi_status
acpi_ns_check_object_type(
struct acpi_evaluate_info *info,
union acpi_operand_object **return_object_ptr,
u32 expected_btypes, u32 package_index)
{
union acpi_operand_object *return_object = *return_object_ptr;
acpi_status status = AE_OK;
char type_buffer[96];
/* Room for 10 types */
/* A Namespace node should not get here, but make sure */
if (return_object &&
ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
info->node_flags,
"Invalid return type - Found a Namespace node [%4.4s] type %s",
return_object->node.name.ascii,
acpi_ut_get_type_name(return_object->node.
type)));
return (AE_AML_OPERAND_TYPE);
}
/*
* Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
* The bitmapped type allows multiple possible return types.
*
* Note, the cases below must handle all of the possible types returned
* from all of the predefined names (including elements of returned
* packages)
*/
info->return_btype = acpi_ns_get_bitmapped_type(return_object);
if (info->return_btype == ACPI_RTYPE_ANY) {
/* Not one of the supported objects, must be incorrect */
goto type_error_exit;
}
/* For reference objects, check that the reference type is correct */
if ((info->return_btype & expected_btypes) == ACPI_RTYPE_REFERENCE) {
status = acpi_ns_check_reference(info, return_object);
return (status);
}
/* Attempt simple repair of the returned object if necessary */
status = acpi_ns_simple_repair(info, expected_btypes,
package_index, return_object_ptr);
if (ACPI_SUCCESS(status)) {
return (AE_OK);
/* Successful repair */
}
type_error_exit:
/* Create a string with all expected types for this predefined object */
acpi_ut_get_expected_return_types(type_buffer, expected_btypes);
if (!return_object) {
ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
info->node_flags,
"Expected return object of type %s",
type_buffer));
}
else if (package_index == ACPI_NOT_PACKAGE_ELEMENT) {
ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
info->node_flags,
"Return type mismatch - found %s, expected %s",
acpi_ut_get_object_type_name
(return_object), type_buffer));
}
else {
ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
info->node_flags,
"Return Package type mismatch at index %u - "
"found %s, expected %s", package_index,
acpi_ut_get_object_type_name
(return_object), type_buffer));
}
return (AE_AML_OPERAND_TYPE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_reference
*
* PARAMETERS: info - Method execution information block
* return_object - Object returned from the evaluation of a
* method or object
*
* RETURN: Status
*
* DESCRIPTION: Check a returned reference object for the correct reference
* type. The only reference type that can be returned from a
* predefined method is a named reference. All others are invalid.
*
******************************************************************************/
static acpi_status
acpi_ns_check_reference(
struct acpi_evaluate_info *info,
union acpi_operand_object *return_object)
{
/*
* Check the reference object for the correct reference type (opcode).
* The only type of reference that can be converted to a union acpi_object is
* a reference to a named object (reference class: NAME)
*/
if (return_object->reference.
class == ACPI_REFCLASS_NAME) {
return (AE_OK);
}
ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
"Return type mismatch - unexpected reference object type [%s] %2.2X",
acpi_ut_get_reference_name(return_object),
return_object->reference.
class));
return (AE_AML_OPERAND_TYPE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_get_bitmapped_type
*
* PARAMETERS: return_object - Object returned from method/obj evaluation
*
* RETURN: Object return type. ACPI_RTYPE_ANY indicates that the object
* type is not supported. ACPI_RTYPE_NONE indicates that no
* object was returned (return_object is NULL).
*
* DESCRIPTION: Convert object type into a bitmapped object return type.
*
******************************************************************************/
static u32 acpi_ns_get_bitmapped_type(
union acpi_operand_object *return_object)
{
u32 return_btype;
if (!return_object) {
return (ACPI_RTYPE_NONE);
}
/* Map acpi_object_type to internal bitmapped type */
switch (return_object->common.type) {
case ACPI_TYPE_INTEGER:
return_btype = ACPI_RTYPE_INTEGER;
break;
case ACPI_TYPE_BUFFER:
return_btype = ACPI_RTYPE_BUFFER;
break;
case ACPI_TYPE_STRING:
return_btype = ACPI_RTYPE_STRING;
break;
case ACPI_TYPE_PACKAGE:
return_btype = ACPI_RTYPE_PACKAGE;
break;
case ACPI_TYPE_LOCAL_REFERENCE:
return_btype = ACPI_RTYPE_REFERENCE;
break;
default:
/* Not one of the supported objects, must be incorrect */
return_btype = ACPI_RTYPE_ANY;
break;
}
return (return_btype);
}
