:orphan:

.. title:: CONFIG_MAX_XLAT_TABLES

.. kconfig:: CONFIG_MAX_XLAT_TABLES

CONFIG_MAX_XLAT_TABLES
######################

*Maximum numbers of translation tables*

Type: ``int``

Help
====

.. code-block:: none

    This option specifies the maximum numbers of translation tables.
    Based on this, translation tables are allocated at compile time and
    used at runtime as needed.  If the runtime need exceeds preallocated
    numbers of translation tables, it will result in assert. Number of
    translation tables required is decided based on how many discrete
    memory regions (both normal and device memory) are present on given
    platform and how much granularity is required while assigning
    attributes to these memory regions.

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

\ :kconfig:`ARM_MMU <CONFIG_ARM_MMU>` && (\ :kconfig:`CPU_CORTEX_A <CONFIG_CPU_CORTEX_A>` || \ :kconfig:`CPU_AARCH64_CORTEX_R <CONFIG_CPU_AARCH64_CORTEX_R>`) && \ :kconfig:`ARM64 <CONFIG_ARM64>`

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

Defaults
========

- 20 if \ :kconfig:`USERSPACE <CONFIG_USERSPACE>` && \ :kconfig:`ARM64_VA_BITS <CONFIG_ARM64_VA_BITS>` >= 40
- 16 if \ :kconfig:`USERSPACE <CONFIG_USERSPACE>`
- 12 if \ :kconfig:`ARM64_VA_BITS <CONFIG_ARM64_VA_BITS>` >= 40
- 8

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



At ``<Zephyr Architecture>/arm64/core/Kconfig:243``

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 MAX_XLAT_TABLES
    	int "Maximum numbers of translation tables"
    	default 20 if USERSPACE && ARM64_VA_BITS >= 40
    	default 16 if USERSPACE
    	default 12 if ARM64_VA_BITS >= 40
    	default 8
    	depends on ARM_MMU && (CPU_CORTEX_A || CPU_AARCH64_CORTEX_R) && ARM64
    	help
    	  This option specifies the maximum numbers of translation tables.
    	  Based on this, translation tables are allocated at compile time and
    	  used at runtime as needed.  If the runtime need exceeds preallocated
    	  numbers of translation tables, it will result in assert. Number of
    	  translation tables required is decided based on how many discrete
    	  memory regions (both normal and device memory) are present on given
    	  platform and how much granularity is required while assigning
    	  attributes to these memory regions.

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