/*++ | |
Copyright (c) 2004, Intel Corporation. All rights reserved.<BR> | |
This program and the accompanying materials | |
are licensed and made available under the terms and conditions of the BSD License | |
which accompanies this distribution. The full text of the license may be found at | |
http://opensource.org/licenses/bsd-license.php | |
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
Module Name: | |
WatchdogTimer.h | |
Abstract: | |
Watchdog Timer Architectural Protocol as defined in the DXE CIS | |
Used to provide system watchdog timer services | |
--*/ | |
#ifndef _ARCH_PROTOCOL_WATCHDOG_TIMER_H_ | |
#define _ARCH_PROTOCOL_WATCHDOG_TIMER_H_ | |
// | |
// Global ID for the Watchdog Timer Architectural Protocol | |
// | |
#define EFI_WATCHDOG_TIMER_ARCH_PROTOCOL_GUID \ | |
{ 0x665E3FF5, 0x46CC, 0x11d4, {0x9A, 0x38, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D} } | |
// | |
// Declare forward reference for the Timer Architectural Protocol | |
// | |
EFI_FORWARD_DECLARATION (EFI_WATCHDOG_TIMER_ARCH_PROTOCOL); | |
typedef | |
VOID | |
(EFIAPI *EFI_WATCHDOG_TIMER_NOTIFY) ( | |
IN UINT64 Time | |
); | |
/*++ | |
Routine Description: | |
A function of this type is called when the watchdog timer fires if a | |
handler has been registered. | |
Arguments: | |
Time - The time in 100 ns units that has passed since the watchdog | |
timer was armed. For the notify function to be called, this | |
must be greater than TimerPeriod. | |
Returns: | |
None. | |
--*/ | |
typedef | |
EFI_STATUS | |
(EFIAPI *EFI_WATCHDOG_TIMER_REGISTER_HANDLER) ( | |
IN EFI_WATCHDOG_TIMER_ARCH_PROTOCOL *This, | |
IN EFI_WATCHDOG_TIMER_NOTIFY NotifyFunction | |
); | |
/*++ | |
Routine Description: | |
This function registers a handler that is to be invoked when the watchdog | |
timer fires. By default, the EFI_WATCHDOG_TIMER protocol will call the | |
Runtime Service ResetSystem() when the watchdog timer fires. If a | |
NotifyFunction is registered, then the NotifyFunction will be called before | |
the Runtime Service ResetSystem() is called. If NotifyFunction is NULL, then | |
the watchdog handler is unregistered. If a watchdog handler is registered, | |
then EFI_SUCCESS is returned. If an attempt is made to register a handler | |
when a handler is already registered, then EFI_ALREADY_STARTED is returned. | |
If an attempt is made to uninstall a handler when a handler is not installed, | |
then return EFI_INVALID_PARAMETER. | |
Arguments: | |
This - The EFI_WATCHDOG_TIMER_ARCH_PROTOCOL instance. | |
NotifyFunction - The function to call when the watchdog timer fires. If this | |
is NULL, then the handler will be unregistered. | |
Returns: | |
EFI_SUCCESS - The watchdog timer handler was registered or | |
unregistered. | |
EFI_ALREADY_STARTED - NotifyFunction is not NULL, and a handler is already | |
registered. | |
EFI_INVALID_PARAMETER - NotifyFunction is NULL, and a handler was not | |
previously registered. | |
--*/ | |
typedef | |
EFI_STATUS | |
(EFIAPI *EFI_WATCHDOG_TIMER_SET_TIMER_PERIOD) ( | |
IN EFI_WATCHDOG_TIMER_ARCH_PROTOCOL *This, | |
IN UINT64 TimerPeriod | |
); | |
/*++ | |
Routine Description: | |
This function sets the amount of time to wait before firing the watchdog | |
timer to TimerPeriod 100 nS units. If TimerPeriod is 0, then the watchdog | |
timer is disabled. | |
Arguments: | |
This - The EFI_WATCHDOG_TIMER_ARCH_PROTOCOL instance. | |
TimerPeriod - The amount of time in 100 nS units to wait before the watchdog | |
timer is fired. If TimerPeriod is zero, then the watchdog | |
timer is disabled. | |
Returns: | |
EFI_SUCCESS - The watchdog timer has been programmed to fire in Time | |
100 nS units. | |
EFI_DEVICE_ERROR - A watchdog timer could not be programmed due to a device | |
error. | |
--*/ | |
typedef | |
EFI_STATUS | |
(EFIAPI *EFI_WATCHDOG_TIMER_GET_TIMER_PERIOD) ( | |
IN EFI_WATCHDOG_TIMER_ARCH_PROTOCOL *This, | |
OUT UINT64 *TimerPeriod | |
); | |
/*++ | |
Routine Description: | |
This function retrieves the amount of time the system will wait before firing | |
the watchdog timer. This period is returned in TimerPeriod, and EFI_SUCCESS | |
is returned. If TimerPeriod is NULL, then EFI_INVALID_PARAMETER is returned. | |
Arguments: | |
This - The EFI_WATCHDOG_TIMER_ARCH_PROTOCOL instance. | |
TimerPeriod - A pointer to the amount of time in 100 nS units that the system | |
will wait before the watchdog timer is fired. If TimerPeriod of | |
zero is returned, then the watchdog timer is disabled. | |
Returns: | |
EFI_SUCCESS - The amount of time that the system will wait before | |
firing the watchdog timer was returned in TimerPeriod. | |
EFI_INVALID_PARAMETER - TimerPeriod is NULL. | |
--*/ | |
// | |
// Interface stucture for the Watchdog Timer Architectural Protocol | |
// | |
struct _EFI_WATCHDOG_TIMER_ARCH_PROTOCOL { | |
EFI_WATCHDOG_TIMER_REGISTER_HANDLER RegisterHandler; | |
EFI_WATCHDOG_TIMER_SET_TIMER_PERIOD SetTimerPeriod; | |
EFI_WATCHDOG_TIMER_GET_TIMER_PERIOD GetTimerPeriod; | |
}; | |
/*++ | |
Protocol Description: | |
This protocol provides the services required to implement the Boot Service | |
SetWatchdogTimer(). It provides a service to set the amount of time to wait | |
before firing the watchdog timer, and it also provides a service to register | |
a handler that is invoked when the watchdog timer fires. This protocol can | |
implement the watchdog timer by using the event and timer Boot Services, or | |
it can make use of custom hardware. When the watchdog timer fires, control | |
will be passed to a handler if one has been registered. If no handler has | |
been registered, or the registered handler returns, then the system will be | |
reset by calling the Runtime Service ResetSystem(). | |
Parameters: | |
RegisterHandler - Registers a handler that is invoked when the watchdog | |
timer fires. | |
SetTimerPeriod - Sets the amount of time in 100 ns units to wait before the | |
watchdog timer is fired. If this function is supported, | |
then the watchdog timer period will be rounded up to the | |
nearest supported watchdog timer period. | |
GetTimerPeriod - Retrieves the amount of time in 100 ns units that the | |
system will wait before the watchdog timer is fired. | |
--*/ | |
extern EFI_GUID gEfiWatchdogTimerArchProtocolGuid; | |
#endif | |