Interrupts Generated by the PPU Processor
The PPU generates a system interrupt when the APB programming interface detects an address decode error.
GIC System Interrupt Controller
The PPU receives all system interrupts into its GIC interrupt controller. These interrupts are masked the PMC global registers. The interrupts are listed in the System Interrupts chapter.
Inter-processor Interrupts
The PPU processor is a hardwired IPI agent. This enables the PLM firmware to receive and establish communication channels between itself and other IPI processor agents. The IPI is described in Inter-Processor Interrupts.