Tianocore/edk2.git/DynamicTablesPkg/Library/FdtHwInfoParserLib/Arm/GenericTimer/ArmGenericTimerParser.h, branch master

DynamicTablesPkg: Support EL2 virtual timer in ArmGenericTimerParser

2026-07-31T13:57:58+00:00

When edk2 runs as a kvmtool guest with nested virtualization enabled, the Arm architectural timer DT node contains five interrupt specifiers. The fifth interrupt describes the EL2 virtual timer. ArmGenericTimerParser currently expects exactly four timer interrupts. It therefore asserts when parsing the timer node generated for a nested virtualization guest. Determine the number of interrupt specifiers present in the DT and populate each architectural timer entry only when it is available. Add support for the EL2 virtual timer and use it to populate the VirtualPL2Timer fields in the generated GTDT information. Tested as a KVM guest at EL1 and EL2, with both E2H==0 and E2H==1. Signed-off-by: Marc Zyngier [Varshit Pandya: Rewrite commit message for clarity.] Ref: https://edk2.groups.io/g/devel/message/122008 Signed-off-by: Varshit Pandya

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: FdtHwInfoParserLib: Move ARM parsers to Arm directory

2024-07-29T13:44:55+00:00

Create an Arm directory in the FdtHwInfoParserLib as a preparation step to support other architectures. Suggested-by: Sunil V L Signed-off-by: Pierre Gondois Reviewed-by: Sami Mujawar