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@@ -0,0 +1,89 @@
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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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+ * SPDX-License-Identifier: GPL-2.0+
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+ */
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+
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+#include <common.h>
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+#include <efi_loader.h>
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+
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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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+
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+static struct efi_event *watchdog_timer_event;
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+
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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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+
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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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+
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+ EFI_EXIT(EFI_UNSUPPORTED);
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+}
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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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+
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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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+/*
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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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+int efi_watchdog_register(void)
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+{
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+ efi_status_t r;
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+
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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,
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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 0;
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+}
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