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Purpose of EL0 EL1 ..

techguyz

Hi all,

ARMV8 has number of exception levels as EL0 , EL1, EL2, EL3 .. How this is managed and what is the exact use case of the same ?

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  • 0 in reply to techguyz

    It only really applies to Cortex-A at present.

    - Most ARMv7-A processors (Cortex-A15, Cortex-A7 etc) support the four levels of privilege and the Virtualization Extensions. Sme of the earlier ones (e.g. Cortex-A9, Cortex-A5) do not support the Virtualization Extensions.

    - ARMv7-R does not include the Virtualization Extensions so processors like Cortex-R4, Cortex-R5, Cortex-R7 do not support the extra privilege level.

    - ARMv8-A includes everything I mentioned above (Cortex-A53, Cortex-A57 etc)

    - The full details of ARMv8-R have not yet been released but we do know that it includes support for the Hypervisor Mode and the Virtualization Extensions allowing implementation of a full Type 1 Hypervisor.

    Hope this helps.

    Chris

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  • 0 in reply to techguyz

    It only really applies to Cortex-A at present.

    - Most ARMv7-A processors (Cortex-A15, Cortex-A7 etc) support the four levels of privilege and the Virtualization Extensions. Sme of the earlier ones (e.g. Cortex-A9, Cortex-A5) do not support the Virtualization Extensions.

    - ARMv7-R does not include the Virtualization Extensions so processors like Cortex-R4, Cortex-R5, Cortex-R7 do not support the extra privilege level.

    - ARMv8-A includes everything I mentioned above (Cortex-A53, Cortex-A57 etc)

    - The full details of ARMv8-R have not yet been released but we do know that it includes support for the Hypervisor Mode and the Virtualization Extensions allowing implementation of a full Type 1 Hypervisor.

    Hope this helps.

    Chris

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