:orphan:

.. title:: CLFLUSH_INSTRUCTION_SUPPORTED

.. option:: CONFIG_CLFLUSH_INSTRUCTION_SUPPORTED

*CLFLUSH instruction supported*

Type: ``bool``

Help
====

An implementation of sys_cache_flush() that uses CLFLUSH is made
available, instead of the one using WBINVD.

This option should only be enabled if it is known in advance that the
CPU supports the CLFLUSH instruction. It disables runtime detection of
CLFLUSH support thereby reducing both memory footprint and boot time.

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

!\ :option:`CLFLUSH_DETECT <CONFIG_CLFLUSH_DETECT>` && \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>` && !\ :option:`X86_64 <CONFIG_X86_64>` && \ :option:`X86 <CONFIG_X86>`

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

Defaults
========

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

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

.. highlight:: kconfig

At ``arch/x86/core/Kconfig.ia32:156``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:29`` → ``arch/Kconfig:12`` → ``arch/x86/Kconfig:319``

Menu path: (Top) → X86 Architecture Options → Processor Capabilities

.. parsed-literal::

    config CLFLUSH_INSTRUCTION_SUPPORTED
    	bool "CLFLUSH instruction supported"
    	depends on !\ :option:`CLFLUSH_DETECT <CONFIG_CLFLUSH_DETECT>` && \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>` && !\ :option:`X86_64 <CONFIG_X86_64>` && \ :option:`X86 <CONFIG_X86>`
    	help
    	  An implementation of sys_cache_flush() that uses CLFLUSH is made
    	  available, instead of the one using WBINVD.
	  
    	  This option should only be enabled if it is known in advance that the
    	  CPU supports the CLFLUSH instruction. It disables runtime detection of
    	  CLFLUSH support thereby reducing both memory footprint and boot time.

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