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+.. comment SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. COMMENT: COPYRIGHT (c) 2018.
+.. COMMENT: RTEMS Foundation, The RTEMS Documentation Project
+
+Preface
+*******
+
+The Real Time Executive for Multiprocessor Systems (RTEMS) operating
+systems is a layered system with each of the public APIs implemented in
+terms of a common foundation layer called the SuperCore. RTEMS provides
+full capabilities for management of tasks, interrupts time, and multiple
+processors in addition to those features typical of generic operating
+systems. RTEMS has been implemented in both the Ada and C programming
+languages.
+
+.. topic: RTEMS Mission Statement
+
+ RTEMS development aims to provide a free deterministic real-time operating
+ system targeted towards deeply embedded systems which is competitive
+ with closed source products. The RTEMS project encourages the support
+ and use of standard APIs in order to promote application portability
+ and ease porting other packages to the RTEMS environment. Source:
+ https://devel.rtems.org/wiki/Mission_Statement
+
+The RTEMS development effort uses an open development environment in
+which all users collaborate to improve RTEMS. The RTEMS cross development
+toolset is based upon the free GNU tools and the open source C Library
+newlib. RTEMS supports many host platforms and target architectures.