Before you begin

This guide covers the basic operation of the GICv3 and v4 and the use of Shared Peripheral Interrupt (SPIs), Private Peripheral Interrupt (PPIs), and Software Generated Interrupts (SGIs).

This guide complements the Arm Generic Interrupt Controller Architecture Specification GIC architecture version 3.0 and 4.0. It is not a replacement or an alternative. Refer to the Arm Generic Interrupt Controller Architecture Specification GIC architecture version 3.0 and 4.0 for detailed descriptions of registers and behaviors.

GICv3 and GICv4 allow for several different configurations and use cases. For simplicity, this guide concentrates on a subset of those configurations and use cases, in which:

  • Two Security states are present.
  • Affinity routing is enabled for both Security states.
  • System register access is enabled at all Exception levels.
  • The connected processor, or processors, are Armv8-A compliant, implement all Exception levels and use AArch64 at all Exception levels.

This guide does not cover:

  • Legacy operation.
  • Use from an Exception level that is using AArch32.

This guide assumes that you are familiar with the Arm Exception model. If you want to learn about the Arm Exception model, you can read the Learn the Architecture: Exception model guide.

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