// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI watchdog
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*
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* Copyright (c) 2017 Heinrich Schuchardt
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*/
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#include <common.h>
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#include <efi_loader.h>
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/* Conversion factor from seconds to multiples of 100ns */
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#define EFI_SECONDS_TO_100NS 10000000ULL
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static struct efi_event *watchdog_timer_event;
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/*
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* Reset the system when the watchdog event is notified.
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*
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* @event: the watchdog event
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* @context: not used
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*/
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static void EFIAPI efi_watchdog_timer_notify(struct efi_event *event,
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void *context)
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{
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EFI_ENTRY("%p, %p", event, context);
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printf("\nEFI: Watchdog timeout\n");
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EFI_CALL_VOID(efi_runtime_services.reset_system(EFI_RESET_COLD,
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EFI_SUCCESS, 0, NULL));
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EFI_EXIT(EFI_UNSUPPORTED);
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}
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/*
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* Reset the watchdog timer.
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*
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* This function is used by the SetWatchdogTimer service.
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*
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* @timeout: seconds before reset by watchdog
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* @return: status code
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*/
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efi_status_t efi_set_watchdog(unsigned long timeout)
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{
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efi_status_t r;
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if (timeout)
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/* Reset watchdog */
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r = efi_set_timer(watchdog_timer_event, EFI_TIMER_RELATIVE,
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EFI_SECONDS_TO_100NS * timeout);
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else
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/* Deactivate watchdog */
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r = efi_set_timer(watchdog_timer_event, EFI_TIMER_STOP, 0);
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return r;
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}
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/*
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* Initialize the EFI watchdog.
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*
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* This function is called by efi_init_obj_list()
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*/
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efi_status_t efi_watchdog_register(void)
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{
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efi_status_t r;
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/*
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* Create a timer event.
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*/
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r = efi_create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
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efi_watchdog_timer_notify, NULL, NULL,
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&watchdog_timer_event);
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if (r != EFI_SUCCESS) {
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printf("ERROR: Failed to register watchdog event\n");
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return r;
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}
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/*
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* The UEFI standard requires that the watchdog timer is set to five
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* minutes when invoking an EFI boot option.
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*
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* Unified Extensible Firmware Interface (UEFI), version 2.7 Errata A
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* 7.5. Miscellaneous Boot Services - EFI_BOOT_SERVICES.SetWatchdogTimer
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*/
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r = efi_set_watchdog(300);
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if (r != EFI_SUCCESS) {
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printf("ERROR: Failed to set watchdog timer\n");
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return r;
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}
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return EFI_SUCCESS;
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}
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