scope:

This document introduces the concepts and principles specified within ARINC 653 to support the API, including vocabulary and definitions, and system architecture.

Both the interface and the behavior of the API services are specified in ARINC 653. Behavior is specified to the extent needed to describe functionality relevant to calling applications.

Where necessary, assumptions are made as to the support or behavior provided by the CSW and hardware. This document should not be construed as a specification for the CSW or hardware. However, where the CSW or hardware does not coincide with the stated assumptions, the API behaviors specified in ARINC 653 may not match the actual behavior.

ARINC 653 is intended for use in a partitioned software environment. In order to assure a high degree of portability, aspects of the partitioned environment are discussed and assumed. However, ARINC 653 does not define the complete system, hardware, and software requirements for partitioning nor does it provide guidance on proper implementation of partitioning, and in particular, robust partitioning. It must not be construed that compliance to ARINC 653 assures robust partitioning.