Security extensions support
The Interrupt Controller permits all implemented interrupts to be individually defined as Secure or Non-secure.
You can program Secure interrupts to use either the IRQ or FIQ interrupt mechanism of a Cortex®â€‘A9 processor through the FIQen bit in the ICPICR Register. Non-secure interrupts are always signaled using the IRQ mechanism of a Cortexâ€‘A9 processor.
This section contains the following subsections: