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diff --git a/os/rt/templates/chtypes.h b/os/rt/templates/chtypes.h
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+/*
+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+                 2011,2012,2013 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file    templates/chtypes.h
+ * @brief   System types template.
+ * @details The types defined in this file may change depending on the target
+ *          architecture. You may also try to optimize the size of the various
+ *          types in order to privilege size or performance, be careful in
+ *          doing so.
+ *
+ * @addtogroup types
+ * @details System types and macros.
+ * @{
+ */
+
+#ifndef _CHTYPES_H_
+#define _CHTYPES_H_
+
+#define __need_NULL
+#define __need_size_t
+#include <stddef.h>
+
+#if !defined(_STDINT_H) && !defined(__STDINT_H_)
+#include <stdint.h>
+#endif
+
+/**
+ * @brief   Thread mode flags, uint8_t is ok.
+ */
+typedef uint8_t         tmode_t;
+
+/**
+ * @brief   Thread state, uint8_t is ok.
+ */
+typedef uint8_t         tstate_t;
+
+/**
+ * @brief   Thread references counter, uint8_t is ok.
+ */
+typedef uint8_t         trefs_t;
+
+/**
+ * @brief   Priority, use the fastest unsigned type.
+ */
+typedef uint32_t        tprio_t;
+
+/**
+ * @brief   Message, use signed pointer equivalent.
+ */
+typedef int32_t         msg_t;
+
+/**
+ * @brief   Numeric event identifier, use fastest signed.
+ */
+typedef int32_t         eventid_t;
+
+/**
+ * @brief   Mask of event identifiers, recommended fastest unsigned.
+ */
+typedef uint32_t        eventmask_t;
+
+/**
+ * @brief   Mask of event flags, recommended fastest unsigned.
+ */
+typedef uint32_t        eventflags_t;
+
+/**
+ * @brief   System Time, recommended fastest unsigned.
+ */
+typedef uint32_t        systime_t;
+
+/**
+ * @brief   Counter, recommended fastest signed.
+ */
+typedef int32_t         cnt_t;
+
+#endif /* _CHTYPES_H_ */
+
+/** @} */