A Hardware Abstraction Layer in Java

Authors:
Martin Schoeberl;Stephan Korsholm;Tomas Kalibera;Anders P. Ravn
Affiliations:
Vienna University of Technology;Aalborg University;Purdue University;Aalborg University
Venue:
ACM Transactions on Embedded Computing Systems (TECS)
Year:
2011

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Abstract

Embedded systems use specialized hardware devices to interact with their environment, and since they have to be dependable, it is attractive to use a modern, type-safe programming language like Java to develop programs for them. Standard Java, as a platform-independent language, delegates access to devices, direct memory access, and interrupt handling to some underlying operating system or kernel, but in the embedded systems domain resources are scarce and a Java Virtual Machine (JVM) without an underlying middleware is an attractive architecture. The contribution of this article is a proposal for Java packages with hardware objects and interrupt handlers that interface to such a JVM. We provide implementations of the proposal directly in hardware, as extensions of standard interpreters, and finally with an operating system middleware. The latter solution is mainly seen as a migration path allowing Java programs to coexist with legacy system components. An important aspect of the proposal is that it is compatible with the Real-Time Specification for Java (RTSJ).