/** @file
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IPMI Os watchdog timer Driver.
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Copyright (c) 2018 - 2019, 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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#include <Uefi.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/IpmiCommandLib.h>
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#include <IndustryStandard/Ipmi.h>
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BOOLEAN mOsWdtFlag = FALSE;
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EFI_EVENT mExitBootServicesEvent;
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VOID
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EFIAPI
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EnableEfiOsBootWdtHandler (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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/*++
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Routine Description:
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Enable the OS Boot Watchdog Timer.
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Is called only on legacy or EFI OS boot.
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Arguments:
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Event - Event type
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*Context - Context for the event
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Returns:
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None
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--*/
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{
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EFI_STATUS Status;
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IPMI_SET_WATCHDOG_TIMER_REQUEST SetWatchdogTimer;
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UINT8 CompletionCode;
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IPMI_GET_WATCHDOG_TIMER_RESPONSE GetWatchdogTimer;
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static BOOLEAN OsWdtEventHandled = FALSE;
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DEBUG((DEBUG_ERROR, "!!! EnableEfiOsBootWdtHandler()!!!\n"));
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//
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// Make sure it processes once only. And proceess it only if OsWdtFlag==TRUE;
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//
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if (OsWdtEventHandled || !mOsWdtFlag) {
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return ;
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}
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OsWdtEventHandled = TRUE;
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Status = IpmiGetWatchdogTimer (&GetWatchdogTimer);
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if (EFI_ERROR (Status)) {
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return ;
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}
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ZeroMem (&SetWatchdogTimer, sizeof(SetWatchdogTimer));
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//
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// Just flip the Timer Use bit. This should release the timer.
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//
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SetWatchdogTimer.TimerUse.Bits.TimerRunning = 1;
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SetWatchdogTimer.TimerUse.Bits.TimerUse = IPMI_WATCHDOG_TIMER_OS_LOADER;
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SetWatchdogTimer.TimerActions.Uint8 = IPMI_WATCHDOG_TIMER_ACTION_HARD_RESET;
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SetWatchdogTimer.TimerUseExpirationFlagsClear &= ~BIT4;
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SetWatchdogTimer.TimerUseExpirationFlagsClear |= BIT1 | BIT2;
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SetWatchdogTimer.InitialCountdownValue = 600; // 100ms / count
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Status = IpmiSetWatchdogTimer (&SetWatchdogTimer, &CompletionCode);
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return ;
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}
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EFI_STATUS
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EFIAPI
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DriverInit (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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/*++
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Routine Description:
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This is the standard EFI driver point. This function intitializes
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the private data required for creating ASRR Driver.
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Arguments:
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As required for DXE driver enrty routine.
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ImageHandle - ImageHandle of the loaded driver
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SystemTable - Pointer to the System Table
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Returns:
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@retval EFI_SUCCESS Protocol successfully started and installed.
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@retval EFI_OUT_OF_RESOURCES The event could not be allocated.
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--*/
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{
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EFI_STATUS Status;
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Status = gBS->CreateEvent (
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EVT_SIGNAL_EXIT_BOOT_SERVICES,
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TPL_NOTIFY,
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EnableEfiOsBootWdtHandler,
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NULL,
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&mExitBootServicesEvent
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);
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return Status;
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}
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