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Arm Cortex-A55 Core Technical Reference Manual : About system control

About system control

The system registers control and provide status information for the functions that the core implements.

The main functions of the system registers are:

  • Overall system control and configuration.
  • MMU configuration and management.
  • Cache configuration and management.
  • System performance monitoring.
  • GIC configuration and management.

The system registers are accessible in the AArch64 and AArch32 Execution states. Some of the system registers are accessible through the external debug interface.