Abstract
This paper describes how a dedicated Time Management Unit (TMU) is used to reduce the overhead of execution time control. While the implementation described here is for Ada 2012 and a GNAT bare-board run-time environment, the principles should be applicable to other languages and run-time systems. The TMU has been implemented as a peripheral unit for the Atmel AVR®32 UC3 series of microcontrollers, and test results from simulation with the syntheziable RTL code of this system-on-chip are presented.
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References
Atmel Corporation: AVR32 - Architecture Document (November 2007), http://atmel.com/dyn/resources/prod_documents/doc32000.pdf
Atmel Corporation: AVR32UC3 - Technical Reference Manual (March 2010), http://atmel.com/dyn/resources/prod_documents/doc32002.pdf
Burns, A., Wellings, A.: Programming execution-time servers in Ada 2005. In: Proc. 27th IEEE International Real-Time Systems Symposium, RTSS 2006, pp. 47–56 (December 2006)
Forsman, B.: A Time Management Unit (TMU) for Real-Time Systems. Master’s thesis. Norwegian University of Science and Technology, NTNU (2008)
Gregertsen, K.N.: Execution Time Management for AVR32 Ravenscar. Master’s thesis. Norwegian University of Science and Technology, NTNU (2008)
Gregertsen, K.N., Skavhaug, A.: Functional specification for a Time Management Unit. Presented at SAFECOMP 2010 (2010)
Gregertsen, K.N., Skavhaug, A.: An efficient and deterministic multi-tasking run-time environment for Ada and the Ravenscar profile on the Atmel AVR32 UC3 microcontroller. In: Design, Automation & Test in Europe Conference & Exhibition, DATE 2009, pp. 1572–1575 (April 2009)
Gregertsen, K.N., Skavhaug, A.: Execution-time control for interrupt handling. Ada Lett. 30 (2010)
Gregertsen, K.N., Skavhaug, A.: Implementing the new Ada 2005 timing event and execution time control features on the AVR32 architecture. Journal of Systems Architecture 56, 509–522 (2010)
Gregertsen, K.N., Skavhaug, A.: Implementation and usage of the new Ada 2012 execution-time control features. Ada User Journal 32(4), 265–275 (2011)
ISO/IEC: Ada Reference Manual - ISO/IEC 8652:1995(E) with Technical Corrigendum 1 and Amendment 1, http://www.adaic.com/standards/05rm/html/RM-TOC.html
ISO/IEC: Ada Reference Manual - ISO/IEC 8652:201x(E) (Draft 15), http://www.ada-auth.org/standards/ada12.html
Krishna, C.M., Shin, K.G.: Real-Time Systems. McGraw-Hill International Edition (1997)
Michell, S., Real, J.: Conclusions of the 14th International Real-Time Ada Workshop. Ada Lett. 30 (2010)
Rivas, M.A., Harbour, M.G.: Execution time monitoring and interrupt handlers: position statement. Ada Lett. 30 (2010)
Santos, O.M., Wellings, A.: Cost enforcement in the real-time specification for Java. Real-Time Systems 37(2), 139–179 (2007)
Skinnemoen, H., Skavhaug, A.: Hardware support for on-line execution time limiting of tasks in a low-power environment. In: EUROMICRO/DSD Work in Progress Session. Institute of system science, Johannes Kepler University, Linz (2003)
Søvik, S.J.: Hardware implementation of a Time Management Unit. Master’s thesis. NTNU (2010)
The Open Group: The Open Group base specifications issue 6, IEEE Std 1003.1, http://www.opengroup.org/onlinepubs/000095399/
Vardanega, T., Harbour, M.G., Pinho, L.M.: Session summary: language and distribution issues. Ada Lett. 30 (2010)
Wellings, A.J., Burns, A.: Real-Time Utilities for Ada 2005. In: Abdennahder, N., Kordon, F. (eds.) Ada-Europe 2007. LNCS, vol. 4498, pp. 1–14. Springer, Heidelberg (2007)
Wilhelm, R., et al.: The worst-case execution-time problem—overview of methods and survey of tools. Trans. on Embedded Computing Sys. 7(3), 1–53 (2008)
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Gregertsen, K.N., Skavhaug, A. (2012). Improving the Performance of Execution Time Control by Using a Hardware Time Management Unit. In: Brorsson, M., Pinho, L.M. (eds) Reliable Software Technologies – Ada-Europe 2012. Ada-Europe 2012. Lecture Notes in Computer Science, vol 7308. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30598-6_13
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DOI: https://doi.org/10.1007/978-3-642-30598-6_13
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