Tianocore/edk2.git/DynamicTablesPkg/Library/Common/AmlLib/ResourceData/AmlResourceData.h, branch master

DynamicTablesPkg: Replace include guards with #pragma once

2026-02-23T21:01:28+00:00

Replace traditional `#ifndef`/`#define`/`#endif` include guards with `#pragma` once. `#pragma once` is a widely supported preprocessor directive that prevents header files from being included multiple times. It is supported by all toolchains used to build edk2: GCC, Clang/LLVM, and MSVC. Compared to macro-based include guards, `#pragma once`: - Eliminates the risk of macro name collisions or copy/paste errors where two headers inadvertently use the same guard macro. - Eliminate inconsistency in the way include guard macros are named (e.g., some files use `__FILE_H__`, others use `FILE_H_`, etc.). - Reduces boilerplate (three lines replaced by one). - Avoids polluting the macro namespace with guard symbols. - Can improve build times as the preprocessor can skip re-opening the file entirely, rather than re-reading it to find the matching `#endif` ("multiple-include optimization"). - Note that some compilers may already optimize traditional include guards, by recognzining the idiomatic pattern. This change is made acknowledging that overall portability of the code will technically be reduced, as `#pragma once` is not part of the C/C++ standards. However, this is considered acceptable given: 1. edk2 already defines a subset of supported compilers in BaseTools/Conf/tools_def.template, all of which have supported `#pragma once` for over two decades. 2. There have been concerns raised to the project about inconsistent include guard naming and potential macro collisions. Approximate compiler support dates: - MSVC: Supported since Visual C++ 4.2 (1996) - GCC: Supported since 3.4 (2004) (http://gnu.ist.utl.pt/software/gcc/gcc-3.4/changes.html) - Clang (LLVM based): Since initial release in 2007 Signed-off-by: Michael Kubacki

DynamicTablesPkg: Apply uncrustify changes

2021-12-07T17:24:28+00:00

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737 Apply uncrustify changes to .c/.h files in the DynamicTablesPkg package Cc: Andrew Fish Cc: Leif Lindholm Cc: Michael D Kinney Signed-off-by: Michael Kubacki Reviewed-by: Sami Mujawar

DynamicTablesPkg: Add AmlRdSetEndTagChecksum()

2021-10-08T15:39:42+00:00

Add AmlRdSetEndTagChecksum(), setting the CheckSum value contained in a Resource Data element. ACPI 6.4, s6.4.2.9 "End Tag": "This checksum is generated such that adding it to the sum of all the data bytes will produce a zero sum." "If the checksum field is zero, the resource data is treated as if the checksum operation succeeded. Configuration proceeds normally." Reviewed-by: Sami Mujawar Signed-off-by: Pierre Gondois

DynamicTablesPkg: AML resource data helper

2020-08-13T18:00:06+00:00

Resource data are defined in the ACPI 6.3 specification, s6.4 "Resource Data Types for ACPI". They can be created using the ASL ResourceTemplate () statement, cf s19.3.3 "ASL Resource Templates". Resource data can be of the small or large type and are defined by their encoding. The resource data is stored in the Bytelist of a BufferOp node. To simplify operations on resource data, the resource data parser examines the Bytelist to detect the presence of resource data. If the data matches the encoding of resource data type(s), the parser fragments the resource data buffer into resource data elements (data nodes) and stores them in the variable arguments list of the BufferOp node. The resource data helper provides functions and macros to assist operations on resource data elements. Signed-off-by: Pierre Gondois Signed-off-by: Sami Mujawar Reviewed-by: Alexei Fedorov