RTEMS 4.9.3 On-Line Library

Board Support Packages Interrupt Stack Requirements

RTEMS C User's Guide

21.2.1: Interrupt Stack Requirements

The worst-case stack usage by interrupt service routines must be taken into account when designing an application. If the processor supports interrupt nesting, the stack usage must include the deepest nest level. The worst-case stack usage must account for the following requirements:

Processor's interrupt stack frame
Processor's subroutine call stack frame
RTEMS system calls
Registers saved on stack
Application subroutine calls

The size of the interrupt stack must be greater than or equal to the confugured minimum stack size.

RTEMS C User's Guide