Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 7/19/2024
Public

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3.6.3.2. Exception Levels

The Cortex* -A55 core support 4 exception levels:
  • EL0 has the lowest software execution privilege, and execution in EL0 is called unprivileged execution. This execution level may be used for application software.
  • EL1 provides support for operating systems.
  • EL2 provides support for processor virtualization or hypervisor mode.
  • EL3 provides support for the secure monitor.
As the exception level increases from 1 to 3, the software execution privilege increases.