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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
  • Memory Management Unit (MMU) configuration and management
  • Cache configuration and management
  • System performance monitoring
  • GIC configuration and management

The system registers are accessible in the AArch64 EL0-EL3 and AArch32 EL0 Execution state. Some of the system registers are accessible through the external debug interface.

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