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139 lines
5.6 KiB
C
139 lines
5.6 KiB
C
/** @file
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Watchdog Timer Architectural Protocol as defined in PI Specification VOLUME 2 DXE
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Used to provide system watchdog timer services
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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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#ifndef __ARCH_PROTOCOL_WATCHDOG_TIMER_H__
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#define __ARCH_PROTOCOL_WATCHDOG_TIMER_H__
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///
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/// Global ID for the Watchdog Timer Architectural Protocol
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///
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#define EFI_WATCHDOG_TIMER_ARCH_PROTOCOL_GUID \
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{ 0x665E3FF5, 0x46CC, 0x11d4, {0x9A, 0x38, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D } }
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///
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/// Declare forward reference for the Timer Architectural Protocol
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///
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typedef struct _EFI_WATCHDOG_TIMER_ARCH_PROTOCOL EFI_WATCHDOG_TIMER_ARCH_PROTOCOL;
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/**
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A function of this type is called when the watchdog timer fires if a
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handler has been registered.
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@param Time The time in 100 ns units that has passed since the watchdog
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timer was armed. For the notify function to be called, this
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must be greater than TimerPeriod.
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@return None.
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**/
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typedef
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VOID
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(EFIAPI *EFI_WATCHDOG_TIMER_NOTIFY)(
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IN UINT64 Time
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);
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/**
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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
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unregistered.
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@retval EFI_ALREADY_STARTED NotifyFunction is not NULL, and a handler is already
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registered.
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@retval EFI_INVALID_PARAMETER NotifyFunction is NULL, and a handler was not
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previously registered.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_WATCHDOG_TIMER_REGISTER_HANDLER)(
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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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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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typedef
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EFI_STATUS
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(EFIAPI *EFI_WATCHDOG_TIMER_SET_TIMER_PERIOD)(
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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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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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typedef
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EFI_STATUS
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(EFIAPI *EFI_WATCHDOG_TIMER_GET_TIMER_PERIOD)(
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IN EFI_WATCHDOG_TIMER_ARCH_PROTOCOL *This,
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OUT UINT64 *TimerPeriod
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);
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///
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/// This protocol provides the services required to implement the Boot Service
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/// SetWatchdogTimer(). It provides a service to set the amount of time to wait
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/// before firing the watchdog timer, and it also provides a service to register
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/// a handler that is invoked when the watchdog timer fires. This protocol can
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/// implement the watchdog timer by using the event and timer Boot Services, or
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/// it can make use of custom hardware. When the watchdog timer fires, control
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/// will be passed to a handler if one has been registered. If no handler has
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/// been registered, or the registered handler returns, then the system will be
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/// reset by calling the Runtime Service ResetSystem().
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///
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struct _EFI_WATCHDOG_TIMER_ARCH_PROTOCOL {
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EFI_WATCHDOG_TIMER_REGISTER_HANDLER RegisterHandler;
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EFI_WATCHDOG_TIMER_SET_TIMER_PERIOD SetTimerPeriod;
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EFI_WATCHDOG_TIMER_GET_TIMER_PERIOD GetTimerPeriod;
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};
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extern EFI_GUID gEfiWatchdogTimerArchProtocolGuid;
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#endif
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