RTEMS CPU Architecture Supplement
Different types of processors respond to the occurrence of an interrupt in its own unique fashion. In addition, each processor type provides a control mechanism to allow for the proper handling of an interrupt. The processor dependent response to the interrupt modifies the current execution state and results in a change in the execution stream. Most processors require that an interrupt handler utilize some special control mechanisms to return to the normal processing stream. Although RTEMS hides many of the processor dependent details of interrupt processing, it is important to understand how the RTEMS interrupt manager is mapped onto the processor's unique architecture. Discussed in this chapter are the ARM's interrupt response and control mechanisms as they pertain to RTEMS.
The ARM has 7 exception types:
Of these types, only IRQ and FIQ are handled through RTEMS's interrupt vectoring.
RTEMS CPU Architecture Supplement
Copyright © 1988-2004 OAR Corporation