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diff --git a/include/distortos/internal/scheduler/lowLevelInitialization.hpp b/include/distortos/internal/scheduler/lowLevelInitialization.hpp
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+++ b/include/distortos/internal/scheduler/lowLevelInitialization.hpp
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+/**
+ * \file
+ * \brief internal::lowLevelInitialization() declaration
+ *
+ * \author Copyright (C) 2015 Kamil Szczygiel http://www.distortec.com http://www.freddiechopin.info
+ *
+ * \par License
+ * This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not
+ * distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDE_DISTORTOS_INTERNAL_SCHEDULER_LOWLEVELINITIALIZATION_HPP_
+#define INCLUDE_DISTORTOS_INTERNAL_SCHEDULER_LOWLEVELINITIALIZATION_HPP_
+
+namespace distortos
+{
+
+namespace internal
+{
+
+/*---------------------------------------------------------------------------------------------------------------------+
+| global functions' declarations
++---------------------------------------------------------------------------------------------------------------------*/
+
+/**
+ * \brief Low level system initialization
+ *
+ * 1. Initializes main instance of system's Scheduler;
+ * 2. Initializes main thread with its group;
+ * 3. Starts idle thread;
+ * 4. Initializes main instance of Mutex used for malloc() and free() locking;
+ * 5. Initializes main instance of DeferredThreadDeleter (only if CONFIG_THREAD_DETACH_ENABLE option is enabled);
+ *
+ * This function is called before constructors for global and static objects from __libc_init_array() via address in
+ * distortosPreinitArray[].
+ */
+
+void lowLevelInitialization();
+
+}	// namespace internal
+
+}	// namespace distortos
+
+#endif	// INCLUDE_DISTORTOS_INTERNAL_SCHEDULER_LOWLEVELINITIALIZATION_HPP_