// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: nsrepair - Repair for objects returned by predefined methods * * Copyright (C) 2000 - 2025, Intel Corp. * *****************************************************************************/ #include <acpi/acpi.h> #include "accommon.h" #include "acnamesp.h" #include "acinterp.h" #include "acpredef.h" #include "amlresrc.h" #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nsrepair") /******************************************************************************* * * This module attempts to repair or convert objects returned by the * predefined methods to an object type that is expected, as per the ACPI * specification. The need for this code is dictated by the many machines that * return incorrect types for the standard predefined methods. Performing these * conversions here, in one place, eliminates the need for individual ACPI * device drivers to do the same. Note: Most of these conversions are different * than the internal object conversion routines used for implicit object * conversion. * * The following conversions can be performed as necessary: * * Integer -> String * Integer -> Buffer * String -> Integer * String -> Buffer * Buffer -> Integer * Buffer -> String * Buffer -> Package of Integers * Package -> Package of one Package * * Additional conversions that are available: * Convert a null return or zero return value to an end_tag descriptor * Convert an ASCII string to a Unicode buffer * * An incorrect standalone object is wrapped with required outer package * * Additional possible repairs: * Required package elements that are NULL replaced by Integer/String/Buffer * ******************************************************************************/ /* Local prototypes */ static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct acpi_namespace_node *node, u32 return_btype, u32 package_index); /* * Special but simple repairs for some names. * * 2nd argument: Unexpected types that can be repaired */ static const struct acpi_simple_repair_info acpi_object_repair_info[] = { /* Resource descriptor conversions */ {"_CRS", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE, ACPI_NOT_PACKAGE_ELEMENT, acpi_ns_convert_to_resource}, {"_DMA", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE, ACPI_NOT_PACKAGE_ELEMENT, acpi_ns_convert_to_resource}, {"_PRS", ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER | ACPI_RTYPE_NONE, ACPI_NOT_PACKAGE_ELEMENT, acpi_ns_convert_to_resource}, /* Object reference conversions */ {"_DEP", ACPI_RTYPE_STRING, ACPI_ALL_PACKAGE_ELEMENTS, acpi_ns_convert_to_reference}, /* Unicode conversions */ {"_MLS", ACPI_RTYPE_STRING, 1, acpi_ns_convert_to_unicode}, {"_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER, ACPI_NOT_PACKAGE_ELEMENT, acpi_ns_convert_to_unicode}, {{0, 0, 0, 0}, 0, 0, NULL} /* Table terminator */ }; /******************************************************************************* * * FUNCTION: acpi_ns_simple_repair * * PARAMETERS: info - Method execution information block * expected_btypes - Object types expected * package_index - Index of object within parent package (if * applicable - ACPI_NOT_PACKAGE_ELEMENT * otherwise) * return_object_ptr - Pointer to the object returned from the * evaluation of a method or object * * RETURN: Status. AE_OK if repair was successful. * * DESCRIPTION: Attempt to repair/convert a return object of a type that was * not expected. * ******************************************************************************/ acpi_status acpi_ns_simple_repair(struct acpi_evaluate_info *info, u32 expected_btypes, u32 package_index, union acpi_operand_object **return_object_ptr) { union acpi_operand_object *return_object = *return_object_ptr; union acpi_operand_object *new_object = NULL; acpi_status status; const struct acpi_simple_repair_info *predefined; ACPI_FUNCTION_NAME(ns_simple_repair); /* * Special repairs for certain names that are in the repair table. * Check if this name is in the list of repairable names. */ predefined = acpi_ns_match_simple_repair(info->node, info->return_btype, package_index); if (predefined) { if (!return_object) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, ACPI_WARN_ALWAYS, "Missing expected return value")); } status = predefined->object_converter(info->node, return_object, &new_object); if (ACPI_FAILURE(status)) { /* A fatal error occurred during a conversion */ ACPI_EXCEPTION((AE_INFO, status, "During return object analysis")); return (status); } if (new_object) { goto object_repaired; } } /* * Do not perform simple object repair unless the return type is not * expected. */ if (info->return_btype & expected_btypes) { return (AE_OK); } /* * At this point, we know that the type of the returned object was not * one of the expected types for this predefined name. Attempt to * repair the object by converting it to one of the expected object * types for this predefined name. */ /* * If there is no return value, check if we require a return value for * this predefined name. Either one return value is expected, or none, * for both methods and other objects. * * Try to fix if there was no return object. Warning if failed to fix. */ if (!return_object) { if (expected_btypes) { if (!(expected_btypes & ACPI_RTYPE_NONE) && package_index != ACPI_NOT_PACKAGE_ELEMENT) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, ACPI_WARN_ALWAYS, "Found unexpected NULL package element")); status = acpi_ns_repair_null_element(info, expected_btypes, package_index, return_object_ptr); if (ACPI_SUCCESS(status)) { return (AE_OK); /* Repair was successful */ } } if (expected_btypes != ACPI_RTYPE_NONE) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, ACPI_WARN_ALWAYS, "Missing expected return value")); return (AE_AML_NO_RETURN_VALUE); } } } if (expected_btypes & ACPI_RTYPE_INTEGER) { status = acpi_ns_convert_to_integer(return_object, &new_object); if (ACPI_SUCCESS(status)) { goto object_repaired; } } if (expected_btypes & ACPI_RTYPE_STRING) { status = acpi_ns_convert_to_string(return_object, &new_object); if (ACPI_SUCCESS(status)) { goto object_repaired; } } if (expected_btypes & ACPI_RTYPE_BUFFER) { status = acpi_ns_convert_to_buffer(return_object, &new_object); if (ACPI_SUCCESS(status)) { goto object_repaired; } } if (expected_btypes & ACPI_RTYPE_PACKAGE) { /* * A package is expected. We will wrap the existing object with a * new package object. It is often the case that if a variable-length * package is required, but there is only a single object needed, the * BIOS will return that object instead of wrapping it with a Package * object. Note: after the wrapping, the package will be validated * for correct contents (expected object type or types). */ status = acpi_ns_wrap_with_package(info, return_object, &new_object); if (ACPI_SUCCESS(status)) { /* * The original object just had its reference count * incremented for being inserted into the new package. */ *return_object_ptr = new_object; /* New Package object */ info->return_flags |= ACPI_OBJECT_REPAIRED; return (AE_OK); } } /* We cannot repair this object */ return (AE_AML_OPERAND_TYPE); object_repaired: /* Object was successfully repaired */ if (package_index != ACPI_NOT_PACKAGE_ELEMENT) { /* Update reference count of new object */ if (!(info->return_flags & ACPI_OBJECT_WRAPPED)) { new_object->common.reference_count = return_object->common.reference_count; } ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Converted %s to expected %s at Package index %u\n", info->full_pathname, acpi_ut_get_object_type_name(return_object), acpi_ut_get_object_type_name(new_object), package_index)); } else { ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Converted %s to expected %s\n", info->full_pathname, acpi_ut_get_object_type_name(return_object), acpi_ut_get_object_type_name(new_object))); } /* Delete old object, install the new return object */ acpi_ut_remove_reference(return_object); *return_object_ptr = new_object; info->return_flags |= ACPI_OBJECT_REPAIRED; return (AE_OK); } /****************************************************************************** * * FUNCTION: acpi_ns_match_simple_repair * * PARAMETERS: node - Namespace node for the method/object * return_btype - Object type that was returned * package_index - Index of object within parent package (if * applicable - ACPI_NOT_PACKAGE_ELEMENT * otherwise) * * RETURN: Pointer to entry in repair table. NULL indicates not found. * * DESCRIPTION: Check an object name against the repairable object list. * *****************************************************************************/ static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct acpi_namespace_node *node, u32 return_btype, u32 package_index) { const struct acpi_simple_repair_info *this_name; /* Search info table for a repairable predefined method/object name */ this_name = acpi_object_repair_info; while (this_name->object_converter) { if (ACPI_COMPARE_NAMESEG(node->name.ascii, this_name->name)) { /* Check if we can actually repair this name/type combination */ if ((return_btype & this_name->unexpected_btypes) && (this_name->package_index == ACPI_ALL_PACKAGE_ELEMENTS || package_index == this_name->package_index)) { return (this_name); } return (NULL); } this_name++; } return (NULL); /* Name was not found in the repair table */ } /******************************************************************************* * * FUNCTION: acpi_ns_repair_null_element * * PARAMETERS: info - Method execution information block * expected_btypes - Object types expected * package_index - Index of object within parent package (if * applicable - ACPI_NOT_PACKAGE_ELEMENT * otherwise) * return_object_ptr - Pointer to the object returned from the * evaluation of a method or object * * RETURN: Status. AE_OK if repair was successful. * * DESCRIPTION: Attempt to repair a NULL element of a returned Package object. * ******************************************************************************/ acpi_status acpi_ns_repair_null_element(struct acpi_evaluate_info *info, u32 expected_btypes, u32 package_index, union acpi_operand_object **return_object_ptr) { union acpi_operand_object *return_object = *return_object_ptr; union acpi_operand_object *new_object; ACPI_FUNCTION_NAME(ns_repair_null_element); /* No repair needed if return object is non-NULL */ if (return_object) { return (AE_OK); } /* * Attempt to repair a NULL element of a Package object. This applies to * predefined names that return a fixed-length package and each element * is required. It does not apply to variable-length packages where NULL * elements are allowed, especially at the end of the package. */ if (expected_btypes & ACPI_RTYPE_INTEGER) { /* Need an integer - create a zero-value integer */ new_object = acpi_ut_create_integer_object((u64)0); } else if (expected_btypes & ACPI_RTYPE_STRING) { /* Need a string - create a NULL string */ new_object = acpi_ut_create_string_object(0); } else if (expected_btypes & ACPI_RTYPE_BUFFER) { /* Need a buffer - create a zero-length buffer */ new_object = acpi_ut_create_buffer_object(0); } else { /* Error for all other expected types */ return (AE_AML_OPERAND_TYPE); } if (!new_object) { return (AE_NO_MEMORY); } /* Set the reference count according to the parent Package object */ new_object->common.reference_count = info->parent_package->common.reference_count; ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Converted NULL package element to expected %s at index %u\n", info->full_pathname, acpi_ut_get_object_type_name(new_object), package_index)); *return_object_ptr = new_object; info->return_flags |= ACPI_OBJECT_REPAIRED; return (AE_OK); } /****************************************************************************** * * FUNCTION: acpi_ns_remove_null_elements * * PARAMETERS: info - Method execution information block * package_type - An acpi_return_package_types value * obj_desc - A Package object * * RETURN: None. * * DESCRIPTION: Remove all NULL package elements from packages that contain * a variable number of subpackages. For these types of * packages, NULL elements can be safely removed. * *****************************************************************************/ void acpi_ns_remove_null_elements(struct acpi_evaluate_info *info, u8 package_type, union acpi_operand_object *obj_desc) { union acpi_operand_object **source; union acpi_operand_object **dest; u32 count; u32 new_count; u32 i; ACPI_FUNCTION_NAME(ns_remove_null_elements); /* * We can safely remove all NULL elements from these package types: * PTYPE1_VAR packages contain a variable number of simple data types. * PTYPE2 packages contain a variable number of subpackages. */ switch (package_type) { case ACPI_PTYPE1_VAR: case ACPI_PTYPE2: case ACPI_PTYPE2_COUNT: case ACPI_PTYPE2_PKG_COUNT: case ACPI_PTYPE2_FIXED: case ACPI_PTYPE2_MIN: case ACPI_PTYPE2_REV_FIXED: case ACPI_PTYPE2_FIX_VAR: break; default: case ACPI_PTYPE2_VAR_VAR: case ACPI_PTYPE1_FIXED: case ACPI_PTYPE1_OPTION: return; } count = obj_desc->package.count; new_count = count; source = obj_desc->package.elements; dest = source; /* Examine all elements of the package object, remove nulls */ for (i = 0; i < count; i++) { if (!*source) { new_count--; } else { *dest = *source; dest++; } source++; } /* Update parent package if any null elements were removed */ if (new_count < count) { ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Found and removed %u NULL elements\n", info->full_pathname, (count - new_count))); /* NULL terminate list and update the package count */ *dest = NULL; obj_desc->package.count = new_count; } } /******************************************************************************* * * FUNCTION: acpi_ns_wrap_with_package * * PARAMETERS: info - Method execution information block * original_object - Pointer to the object to repair. * obj_desc_ptr - The new package object is returned here * * RETURN: Status, new object in *obj_desc_ptr * * DESCRIPTION: Repair a common problem with objects that are defined to * return a variable-length Package of sub-objects. If there is * only one sub-object, some BIOS code mistakenly simply declares * the single object instead of a Package with one sub-object. * This function attempts to repair this error by wrapping a * Package object around the original object, creating the * correct and expected Package with one sub-object. * * Names that can be repaired in this manner include: * _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS, * _BCL, _DOD, _FIX, _Sx * ******************************************************************************/ acpi_status acpi_ns_wrap_with_package(struct acpi_evaluate_info *info, union acpi_operand_object *original_object, union acpi_operand_object **obj_desc_ptr) { union acpi_operand_object *pkg_obj_desc; ACPI_FUNCTION_NAME(ns_wrap_with_package); /* * Create the new outer package and populate it. The new * package will have a single element, the lone sub-object. */ pkg_obj_desc = acpi_ut_create_package_object(1); if (!pkg_obj_desc) { return (AE_NO_MEMORY); } pkg_obj_desc->package.elements[0] = original_object; ACPI_DEBUG_PRINT((ACPI_DB_REPAIR, "%s: Wrapped %s with expected Package object\n", info->full_pathname, acpi_ut_get_object_type_name(original_object))); /* Return the new object in the object pointer */ *obj_desc_ptr = pkg_obj_desc; info->return_flags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED; return (AE_OK); }
