/****************************************************************************** * * Module Name: nsrepair - Repair for objects returned by predefined methods * *****************************************************************************/ /* * Copyright (C) 2000 - 2009, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include #include "accommon.h" #include "acnamesp.h" #include "acpredef.h" #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nsrepair") /******************************************************************************* * * FUNCTION: acpi_ns_repair_object * * PARAMETERS: Data - Pointer to validation data structure * 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_repair_object(struct acpi_predefined_data *data, 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_size length; switch (return_object->common.type) { case ACPI_TYPE_BUFFER: /* Does the method/object legally return a string? */ if (!(expected_btypes & ACPI_RTYPE_STRING)) { return (AE_AML_OPERAND_TYPE); } /* * Have a Buffer, expected a String, convert. Use a to_string * conversion, no transform performed on the buffer data. The best * example of this is the _BIF method, where the string data from * the battery is often (incorrectly) returned as buffer object(s). */ length = 0; while ((length < return_object->buffer.length) && (return_object->buffer.pointer[length])) { length++; } /* Allocate a new string object */ new_object = acpi_ut_create_string_object(length); if (!new_object) { return (AE_NO_MEMORY); } /* * Copy the raw buffer data with no transform. String is already NULL * terminated at Length+1. */ ACPI_MEMCPY(new_object->string.pointer, return_object->buffer.pointer, length); /* * If the original object is a package element, we need to: * 1. Set the reference count of the new object to match the * reference count of the old object. * 2. Decrement the reference count of the original object. */ if (package_index != ACPI_NOT_PACKAGE_ELEMENT) { new_object->common.reference_count = return_object->common.reference_count; if (return_object->common.reference_count > 1) { return_object->common.reference_count--; } ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Converted Buffer to expected String at index %u", package_index)); } else { ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Converted Buffer to expected String")); } /* Delete old object, install the new return object */ acpi_ut_remove_reference(return_object); *return_object_ptr = new_object; data->flags |= ACPI_OBJECT_REPAIRED; return (AE_OK); default: break; } return (AE_AML_OPERAND_TYPE); } /******************************************************************************* * * FUNCTION: acpi_ns_repair_package_list * * PARAMETERS: Data - Pointer to validation data structure * obj_desc_ptr - Pointer to the object to repair. The new * package object is returned here, * overwriting the old object. * * 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 Packages. If the variable-length * is one, some BIOS code mistakenly simply declares a single * Package instead of a Package with one sub-Package. This * function attempts to repair this error by wrapping a Package * object around the original Package, creating the correct * Package with one sub-Package. * * Names that can be repaired in this manner include: * _ALR, _CSD, _HPX, _MLS, _PRT, _PSS, _TRT, TSS * ******************************************************************************/ acpi_status acpi_ns_repair_package_list(struct acpi_predefined_data *data, union acpi_operand_object **obj_desc_ptr) { union acpi_operand_object *pkg_obj_desc; /* * Create the new outer package and populate it. The new package will * have a single element, the lone subpackage. */ pkg_obj_desc = acpi_ut_create_package_object(1); if (!pkg_obj_desc) { return (AE_NO_MEMORY); } pkg_obj_desc->package.elements[0] = *obj_desc_ptr; /* Return the new object in the object pointer */ *obj_desc_ptr = pkg_obj_desc; data->flags |= ACPI_OBJECT_REPAIRED; ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, "Incorrectly formed Package, attempting repair")); return (AE_OK); }