:orphan:

.. title:: CONFIG_ARMV8_A

.. kconfig:: CONFIG_ARMV8_A

CONFIG_ARMV8_A
##############

*(No prompt -- not directly user assignable.)*

Type: ``bool``

Help
====

.. code-block:: none

    This option signifies the use of an ARMv8-A processor
    implementation.

    From https://developer.arm.com/products/architecture/cpu-architecture/a-profile:
    The Armv8-A architecture introduces the ability to use 64-bit and
    32-bit Execution states, known as AArch64 and AArch32 respectively.
    The AArch64 Execution state supports the A64 instruction set, holds
    addresses in 64-bit registers and allows instructions in the base
    instruction set to use 64-bit registers for their processing. The AArch32
    Execution state is a 32-bit Execution state that preserves backwards
    compatibility with the Armv7-A architecture and enhances that profile
    so that it can support some features included in the AArch64 state.
    It supports the T32 and A32 instruction sets.

Direct dependencies
===================

\ :kconfig:`CPU_CORTEX_A <CONFIG_CPU_CORTEX_A>` && \ :kconfig:`ARM64 <CONFIG_ARM64>`

*(Includes any dependencies from ifs and menus.)*

Defaults
========

No defaults. Implicitly defaults to ``n``.

Symbols selected by this symbol
===============================

- \ :kconfig:`ATOMIC_OPERATIONS_BUILTIN <CONFIG_ATOMIC_OPERATIONS_BUILTIN>`
- \ :kconfig:`CPU_HAS_MMU <CONFIG_CPU_HAS_MMU>`
- \ :kconfig:`ARCH_HAS_USERSPACE <CONFIG_ARCH_HAS_USERSPACE>` if \ :kconfig:`ARM_MMU <CONFIG_ARM_MMU>`

Symbols that select this symbol
===============================

- \ :kconfig:`CPU_CORTEX_A53 <CONFIG_CPU_CORTEX_A53>`
- \ :kconfig:`CPU_CORTEX_A72 <CONFIG_CPU_CORTEX_A72>`

Kconfig definition
==================



At ``<Zephyr Architecture>/arm64/core/Kconfig:102``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:39`` → ``<Zephyr Architecture>/Kconfig:12`` → ``<Zephyr Architecture>/arm64/Kconfig:32``

Menu path: (Top) → ARM64 Options

.. code-block:: kconfig

    config ARMV8_A
    	bool
    	select ATOMIC_OPERATIONS_BUILTIN
    	select CPU_HAS_MMU
    	select ARCH_HAS_USERSPACE if ARM_MMU
    	depends on CPU_CORTEX_A && ARM64
    	help
    	  This option signifies the use of an ARMv8-A processor
    	  implementation.
	  
    	  From https://developer.arm.com/products/architecture/cpu-architecture/a-profile:
    	  The Armv8-A architecture introduces the ability to use 64-bit and
    	  32-bit Execution states, known as AArch64 and AArch32 respectively.
    	  The AArch64 Execution state supports the A64 instruction set, holds
    	  addresses in 64-bit registers and allows instructions in the base
    	  instruction set to use 64-bit registers for their processing. The AArch32
    	  Execution state is a 32-bit Execution state that preserves backwards
    	  compatibility with the Armv7-A architecture and enhances that profile
    	  so that it can support some features included in the AArch64 state.
    	  It supports the T32 and A32 instruction sets.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*