There are two interfaces between the RPU MPCore and the RPU GIC.
- The distributor interface is used to assign the interrupts to each of the Cortex®-R5F MPCore processors.
- The CPU interface with a separate set of 4 KB memory-mapped registers for each CPU provides protection against unwanted accesses by one CPU to interrupts that are assigned to the other.
The RPU MPCores processors access the RPU_GIC interrupt controller through their peripheral interface switch. The low-latency peripheral interfaces are really designed for strongly ordered or device type accesses, which are restrictive by nature. Memory that is marked as strongly ordered or device type is typically sensitive to the number of reads or writes performed. Consequently, instructions that access strongly ordered or device memory are never abandoned when they have started accessing memory. These instructions always complete either all or none of their memory accesses. The same is true of all accesses to the low-latency peripheral port, regardless of the memory type.
See the Arm Documents section for a list of documents.