RTEMS 4.10.1 On-Line Library

ARM Specific Information Interrupt Processing

RTEMS CPU Architecture Supplement

2.4: Interrupt Processing

ARM Specific Information Interrupt Levels

ARM Specific Information Interrupt Stack

The ARMv5 (and compatible) architecture has seven exception types:

Reset
Undefined
Software Interrupt (SWI)
Prefetch Abort
Data Abort
Interrupt (IRQ)
Fast Interrupt (FIQ)

Of these types only the IRQ has explicit operating system support. It is intentional that the FIQ is not supported by the operating system. Without operating system support for the FIQ it is not necessary to disable them during critical sections of the system.

RTEMS CPU Architecture Supplement