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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>
96 lines
4 KiB
C
96 lines
4 KiB
C
/** @file
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The internal include file for WatchDogTimer module.
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Copyright (c) 2006 - 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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#include <Uefi.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiDriverEntryPoint.h>
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#include <Library/ReportStatusCodeLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Protocol/WatchdogTimer.h>
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/**
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Registers a handler that is to be invoked when the watchdog timer fires.
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This function registers a handler that is to be invoked when the watchdog
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timer fires. By default, the EFI_WATCHDOG_TIMER protocol will call the
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Runtime Service ResetSystem() when the watchdog timer fires. If a
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NotifyFunction is registered, then the NotifyFunction will be called before
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the Runtime Service ResetSystem() is called. If NotifyFunction is NULL, then
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the watchdog handler is unregistered. If a watchdog handler is registered,
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then EFI_SUCCESS is returned. If an attempt is made to register a handler
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when a handler is already registered, then EFI_ALREADY_STARTED is returned.
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If an attempt is made to uninstall a handler when a handler is not installed,
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then return EFI_INVALID_PARAMETER.
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@param This The EFI_WATCHDOG_TIMER_ARCH_PROTOCOL instance.
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@param NotifyFunction The function to call when the watchdog timer fires. If this
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is NULL, then the handler will be unregistered.
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@retval EFI_SUCCESS The watchdog timer handler was registered or unregistered.
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@retval EFI_ALREADY_STARTED NotifyFunction is not NULL, and a handler is already registered.
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@retval EFI_INVALID_PARAMETER NotifyFunction is NULL, and a handler was not previously registered.
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**/
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EFI_STATUS
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EFIAPI
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WatchdogTimerDriverRegisterHandler (
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IN EFI_WATCHDOG_TIMER_ARCH_PROTOCOL *This,
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IN EFI_WATCHDOG_TIMER_NOTIFY NotifyFunction
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);
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/**
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Sets the amount of time in the future to fire the watchdog timer.
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This function sets the amount of time to wait before firing the watchdog
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timer to TimerPeriod 100 ns units. If TimerPeriod is 0, then the watchdog
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timer is disabled.
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@param This The EFI_WATCHDOG_TIMER_ARCH_PROTOCOL instance.
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@param TimerPeriod The amount of time in 100 ns units to wait before the watchdog
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timer is fired. If TimerPeriod is zero, then the watchdog
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timer is disabled.
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@retval EFI_SUCCESS The watchdog timer has been programmed to fire in Time
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100 ns units.
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@retval EFI_DEVICE_ERROR A watchdog timer could not be programmed due to a device
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error.
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**/
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EFI_STATUS
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EFIAPI
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WatchdogTimerDriverSetTimerPeriod (
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IN EFI_WATCHDOG_TIMER_ARCH_PROTOCOL *This,
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IN UINT64 TimerPeriod
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);
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/**
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Retrieves the amount of time in 100 ns units that the system will wait before firing the watchdog timer.
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This function retrieves the amount of time the system will wait before firing
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the watchdog timer. This period is returned in TimerPeriod, and EFI_SUCCESS
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is returned. If TimerPeriod is NULL, then EFI_INVALID_PARAMETER is returned.
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@param This The EFI_WATCHDOG_TIMER_ARCH_PROTOCOL instance.
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@param TimerPeriod A pointer to the amount of time in 100 ns units that the system
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will wait before the watchdog timer is fired. If TimerPeriod of
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zero is returned, then the watchdog timer is disabled.
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@retval EFI_SUCCESS The amount of time that the system will wait before
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firing the watchdog timer was returned in TimerPeriod.
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@retval EFI_INVALID_PARAMETER TimerPeriod is NULL.
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**/
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EFI_STATUS
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EFIAPI
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WatchdogTimerDriverGetTimerPeriod (
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IN EFI_WATCHDOG_TIMER_ARCH_PROTOCOL *This,
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IN UINT64 *TimerPeriod
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);
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