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88 lines
2.0 KiB
88 lines
2.0 KiB
// 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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