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diff --git a/circuitpython/supervisor/shared/safe_mode.h b/circuitpython/supervisor/shared/safe_mode.h
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+++ b/circuitpython/supervisor/shared/safe_mode.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_SUPERVISOR_SAFE_MODE_H
+#define MICROPY_INCLUDED_SUPERVISOR_SAFE_MODE_H
+
+#include "py/mpconfig.h"
+
+typedef enum {
+    NO_SAFE_MODE = 0,
+    BROWNOUT,
+    HARD_CRASH,
+    USER_SAFE_MODE,
+    HEAP_OVERWRITTEN,
+    MANUAL_SAFE_MODE,
+    MICROPY_NLR_JUMP_FAIL,
+    MICROPY_FATAL_ERROR,
+    GC_ALLOC_OUTSIDE_VM,
+    PROGRAMMATIC_SAFE_MODE,
+    NORDIC_SOFT_DEVICE_ASSERT,
+    FLASH_WRITE_FAIL,
+    MEM_MANAGE,
+    WATCHDOG_RESET,
+    USB_TOO_MANY_ENDPOINTS,
+    USB_TOO_MANY_INTERFACE_NAMES,
+    USB_BOOT_DEVICE_NOT_INTERFACE_ZERO,
+    NO_HEAP,
+    NO_CIRCUITPY,
+} safe_mode_t;
+
+safe_mode_t wait_for_safe_mode_reset(void);
+
+void safe_mode_on_next_reset(safe_mode_t reason);
+void reset_into_safe_mode(safe_mode_t reason) NORETURN;
+
+void print_safe_mode_message(safe_mode_t reason);
+
+#endif  // MICROPY_INCLUDED_SUPERVISOR_SAFE_MODE_H