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https://github.com/Dasharo/edk2-upstream.git
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Michael Kubackiandmergify[bot]
7a934d0bef
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>
125 lines
5.2 KiB
C
125 lines
5.2 KiB
C
/** @file
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SMM Memory Attribute Protocol provides retrieval and update service
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for memory attributes in EFI SMM environment.
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Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#pragma once
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// {69B792EA-39CE-402D-A2A6-F721DE351DFE}
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#define EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL_GUID \
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{ \
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0x69b792ea, 0x39ce, 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } \
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}
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typedef struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL;
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/**
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This function set given attributes of the memory region specified by
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BaseAddress and Length.
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@param This The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
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@param BaseAddress The physical address that is the start address of
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a memory region.
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@param Length The size in bytes of the memory region.
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@param Attributes The bit mask of attributes to set for the memory
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region.
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@retval EFI_SUCCESS The attributes were set for the memory region.
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@retval EFI_INVALID_PARAMETER Length is zero.
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Attributes specified an illegal combination of
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attributes that cannot be set together.
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@retval EFI_UNSUPPORTED The processor does not support one or more
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bytes of the memory resource range specified
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by BaseAddress and Length.
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The bit mask of attributes is not supported for
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the memory resource range specified by
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BaseAddress and Length.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EDKII_SMM_SET_MEMORY_ATTRIBUTES)(
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IN EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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IN UINT64 Attributes
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);
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/**
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This function clears given attributes of the memory region specified by
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BaseAddress and Length.
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@param This The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
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@param BaseAddress The physical address that is the start address of
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a memory region.
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@param Length The size in bytes of the memory region.
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@param Attributes The bit mask of attributes to clear for the memory
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region.
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@retval EFI_SUCCESS The attributes were cleared for the memory region.
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@retval EFI_INVALID_PARAMETER Length is zero.
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Attributes specified an illegal combination of
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attributes that cannot be cleared together.
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@retval EFI_UNSUPPORTED The processor does not support one or more
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bytes of the memory resource range specified
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by BaseAddress and Length.
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The bit mask of attributes is not supported for
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the memory resource range specified by
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BaseAddress and Length.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES)(
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IN EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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IN UINT64 Attributes
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);
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/**
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This function retrieves the attributes of the memory region specified by
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BaseAddress and Length. If different attributes are got from different part
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of the memory region, EFI_NO_MAPPING will be returned.
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@param This The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
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@param BaseAddress The physical address that is the start address of
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a memory region.
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@param Length The size in bytes of the memory region.
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@param Attributes Pointer to attributes returned.
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@retval EFI_SUCCESS The attributes got for the memory region.
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@retval EFI_INVALID_PARAMETER Length is zero.
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Attributes is NULL.
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@retval EFI_NO_MAPPING Attributes are not consistent cross the memory
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region.
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@retval EFI_UNSUPPORTED The processor does not support one or more
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bytes of the memory resource range specified
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by BaseAddress and Length.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EDKII_SMM_GET_MEMORY_ATTRIBUTES)(
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IN EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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OUT UINT64 *Attributes
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);
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///
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/// SMM Memory Attribute Protocol provides services to retrieve or update
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/// attribute of memory in the EFI SMM environment.
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///
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struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL {
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EDKII_SMM_GET_MEMORY_ATTRIBUTES GetMemoryAttributes;
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EDKII_SMM_SET_MEMORY_ATTRIBUTES SetMemoryAttributes;
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EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES ClearMemoryAttributes;
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};
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extern EFI_GUID gEdkiiSmmMemoryAttributeProtocolGuid;
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