The Uni file standard specifies that comments begin with the
characters "//". The following files contained incorrectly
formatted C-style comments and have been updated:
EmbeddedPkg/Drivers/ConsolePrefDxe/ConsolePrefHii.uni
EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformHii.uni
EmbeddedPkg/Drivers/MemoryAttributeManagerDxe/MemoryAttributeManagerDxeHii.uni
The problems were identified during testing of the parser
https://github.com/xpahos/edk2-idea.
Signed-off-by: Alexander Gryanko <xpahos@gmail.com>
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 <michael.kubacki@microsoft.com>
Introduce a driver that allows users to disable the EFI Memory Attribute
protocol through an HII setup option, in order to work around a broken
version of rhboot's shim used in some distros (e.g. CentOS Stream 9)
which incorrectly invokes the protocol and results in a Synchronous
Exception.
Default is enabled, which can also be overridden at build time by
changing `gEmbeddedTokenSpaceGuid.PcdMemoryAttributeEnabledDefault`.
It is only applicable to ARM64 and there isn't any other technical
reason for disabling this security feature.
See:
- https://github.com/microsoft/mu_silicon_arm_tiano/issues/124
- https://edk2.groups.io/g/devel/topic/99631663
- https://github.com/tianocore/edk2/pull/5840
Signed-off-by: Mario Bălănică <mariobalanica02@gmail.com>
