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diff --git a/changes.txt b/changes.txt index f2d6243e5ce4c..61afab31cb201 100644 --- a/changes.txt +++ b/changes.txt @@ -1,4 +1,72 @@ ---------------------------------------- +09 February 2018. Summary of changes for version 20180209: + + +1) ACPICA kernel-resident subsystem: + +Completed the final integration of the recent changes to Package Object +handling and the module-level AML code support. This allows forward +references from individual package elements when the package object is +declared from within module-level code blocks. Provides compatibility +with other ACPI implementations. + +The new architecture for the AML module-level code has been completed and +is now the default for the ACPICA code. This new architecture executes +the module-level code in-line as the ACPI table is loaded/parsed instead +of the previous architecture which deferred this code until after the +table was fully loaded. This solves some ASL code ordering issues and +provides compatibility with other ACPI implementations. At this time, +there is an option to fallback to the earlier architecture, but this +support is deprecated and is planned to be completely removed later this +year. + +Added a compile-time option to ignore AE_NOT_FOUND exceptions during +resolution of named reference elements within Package objects. Although +this is potentially a serious problem, it can generate a lot of +noise/errors on platforms whose firmware carries around a bunch of unused +Package objects. To disable these errors, define +ACPI_IGNORE_PACKAGE_RESOLUTION_ERRORS in the OS-specific header. All +errors are always reported for ACPICA applications such as AcpiExec. + +Fixed a regression related to the explicit type-conversion AML operators +(ToXXXX). The regression was introduced early in 2017 but was not seen +until recently because these operators are not fully supported by other +ACPI implementations and are thus rarely used by firmware developers. The +operators are defined by the ACPI specification to not implement the +"implicit result object conversion". The regression incorrectly +introduced this object conversion for the following explicit conversion +operators: + ToInteger + ToString + ToBuffer + ToDecimalString + ToHexString + ToBCD + FromBCD + + +2) iASL Compiler/Disassembler and Tools: + +iASL: Fixed a problem with the compiler constant folding feature as +related to the ToXXXX explicit conversion operators. These operators do +not support the "implicit result object conversion" by definition. Thus, +ASL expressions that use these operators cannot be folded to a simple +Store operator because Store implements the implicit conversion. This +change uses the CopyObject operator for the ToXXXX operator folding +instead. CopyObject is defined to not implement implicit result +conversions and is thus appropriate for folding the ToXXXX operators. + +iASL: Changed the severity of an error condition to a simple warning for +the case where a symbol is declared both locally and as an external +symbol. This accommodates existing ASL code. + +AcpiExec: The -ep option to enable the new architecture for module-level +code has been removed. It is replaced by the -dp option which instead has +the opposite effect: it disables the new architecture (the default) and +enables the legacy architecture. When the legacy code is removed in the +future, the -dp option will be removed also. + +---------------------------------------- 05 January 2018. Summary of changes for version 20180105: |