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Green Hills Software Extends FACE 3.0 Conformance to Include Intel Architecture
INTEGRITY-178 tuMP Is Still the Only Operating System Certified Conformant to the Latest Version of the FACE Technical Standard(PresseBox) ( Bonn, )
Published in November 2017, Version 3.0 of the FACE Technical Standard requires any Operating System Segment (OSS) that claims support for multicore partitions to meet ARINC-653 Part 1 Supplement 4, including the ability for “Multiple processes within a partition scheduled to execute concurrently on different processor cores.” Simplistic multi-processing architectures, such as Asymmetric Multi-Processing (AMP), are not sufficient to meet the requirements of Supplement 4. INTEGRITY-178 tuMP implements a richer set of multi-processing functionality, allowing any combination of AMP, Bound Multi-Processing (BMP), and Symmetric Multi-Processing (SMP). BMP is an enhanced and restricted form of SMP that can statically bind an application’s ARINC-653 processes to a specific set of cores, allowing the system architect to more tightly control the concurrent operation of multiple cores. The INTEGRITY-178 tuMP implements AMP, BMP, and SMP on all of its FACE-conformant architectures, including Intel, Arm, and Power Architectures.
“Green Hills Software stands alone in our commitment to both FACE certification and support for the broadest set of software multi-processing architectures,” said Dan O'Dowd, founder and chief executive officer of Green Hills Software. “The ability of the INTEGRITY-178 tuMP multicore RTOS to execute a multi-threaded application across multiple processor cores within a time partition enables optimal performance, portability, and sustainment for Integrated Modular Avionics (IMA).”
Meeting worst-case execution times (WCET) while multiple cores are executing concurrently can be very challenging no matter the choice of AMP, SMP, or BMP. Contention from multiple cores trying to access a given shared resource, such as memory or I/O, can create interference between cores. Certification authorities have emphasized their concerns about such interference by including objectives for interference identification, mitigation, and verification in the CAST-32A position paper. As a true multicore IMA operating system with a proven 9-year service history, INTEGRITY-178 tuMP includes both a fully capable multicore scheduler and support for bandwidth allocation and management of shared processor resource access. The supported bandwidth management technique emulates a high-rate hardware-based approach to ensure continuous allocation enforcement. These capabilities greatly lower integration and certification risk, while also enabling the integrator to manage significant software retest costs that would occur when a software application changes or is added.
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