| /****************************************************************************** |
| * |
| * 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 <acpi/acpi.h> |
| #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; |
| |
| /* |
| * 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. Only a limited number of repairs are possible. |
| */ |
| 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); |
| break; |
| |
| case ACPI_TYPE_INTEGER: |
| |
| /* Does the method/object legally return a string? */ |
| |
| if (expected_btypes & ACPI_RTYPE_STRING) { |
| /* |
| * The only supported Integer-to-String conversion is to convert |
| * an integer of value 0 to a NULL string. The last element of |
| * _BIF and _BIX packages occasionally need this fix. |
| */ |
| if (return_object->integer.value != 0) { |
| return (AE_AML_OPERAND_TYPE); |
| } |
| |
| /* Allocate a new NULL string object */ |
| |
| new_object = acpi_ut_create_string_object(0); |
| if (!new_object) { |
| return (AE_NO_MEMORY); |
| } |
| } else { |
| return (AE_AML_OPERAND_TYPE); |
| } |
| break; |
| |
| default: |
| |
| /* We cannot repair this object */ |
| |
| return (AE_AML_OPERAND_TYPE); |
| } |
| |
| /* Object was successfully repaired */ |
| |
| /* |
| * 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 %s to expected %s at index %u", |
| acpi_ut_get_object_type_name |
| (return_object), |
| acpi_ut_get_object_type_name(new_object), |
| package_index)); |
| } else { |
| ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags, |
| "Converted %s to expected %s", |
| 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; |
| data->flags |= ACPI_OBJECT_REPAIRED; |
| return (AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * 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); |
| } |