:orphan:

.. title:: CLFLUSH_DETECT

.. option:: CONFIG_CLFLUSH_DETECT

*Detect support of CLFLUSH instruction at runtime*

Type: ``bool``

Help
====

This option should be enabled if it is not known in advance whether the
CPU supports the CLFLUSH instruction or not.

The CPU is queried at boot time to determine which of the multiple
implementations of sys_cache_flush() linked into the image is the
correct one to use.

If the CPU's support (or lack thereof) of CLFLUSH is known in advance, then
disable this option and set CLFLUSH_INSTRUCTION_SUPPORTED as appropriate.

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

\ :option:`SOC_APOLLO_LAKE <CONFIG_SOC_APOLLO_LAKE>` || \ :option:`SOC_ATOM <CONFIG_SOC_ATOM>` || \ :option:`SOC_ELKHART_LAKE <CONFIG_SOC_ELKHART_LAKE>` || \ :option:`SOC_IA32 <CONFIG_SOC_IA32>` || (\ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>` && !\ :option:`X86_64 <CONFIG_X86_64>` && \ :option:`X86 <CONFIG_X86>`)

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

Defaults
========

- y if \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>`
- y if \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>`
- y if \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>`
- y if \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>`

Kconfig definitions
===================

.. highlight:: kconfig

At ``soc/x86/apollo_lake/Kconfig.defconfig:44``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:19`` → ``/home/runner/work/bridle/bridle/workspace/build/Kconfig/Kconfig.soc.defconfig:1``

Menu path: (Top)

.. parsed-literal::

    config CLFLUSH_DETECT
    	bool
    	default y if \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>`
    	depends on \ :option:`SOC_APOLLO_LAKE <CONFIG_SOC_APOLLO_LAKE>`

----

At ``soc/x86/atom/Kconfig.defconfig:14``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:19`` → ``/home/runner/work/bridle/bridle/workspace/build/Kconfig/Kconfig.soc.defconfig:1``

Menu path: (Top)

.. parsed-literal::

    config CLFLUSH_DETECT
    	bool
    	default y if \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>`
    	depends on \ :option:`SOC_ATOM <CONFIG_SOC_ATOM>`

----

At ``soc/x86/elkhart_lake/Kconfig.defconfig:44``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:19`` → ``/home/runner/work/bridle/bridle/workspace/build/Kconfig/Kconfig.soc.defconfig:1``

Menu path: (Top)

.. parsed-literal::

    config CLFLUSH_DETECT
    	bool
    	default y if \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>`
    	depends on \ :option:`SOC_ELKHART_LAKE <CONFIG_SOC_ELKHART_LAKE>`

----

At ``soc/x86/ia32/Kconfig.defconfig:14``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:19`` → ``/home/runner/work/bridle/bridle/workspace/build/Kconfig/Kconfig.soc.defconfig:1``

Menu path: (Top)

.. parsed-literal::

    config CLFLUSH_DETECT
    	bool
    	default y if \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>`
    	depends on \ :option:`SOC_IA32 <CONFIG_SOC_IA32>`

----

At ``arch/x86/core/Kconfig.ia32:167``

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_DETECT
    	bool "Detect support of CLFLUSH instruction at runtime"
    	depends on \ :option:`CACHE_MANAGEMENT <CONFIG_CACHE_MANAGEMENT>` && !\ :option:`X86_64 <CONFIG_X86_64>` && \ :option:`X86 <CONFIG_X86>`
    	help
    	  This option should be enabled if it is not known in advance whether the
    	  CPU supports the CLFLUSH instruction or not.
	  
    	  The CPU is queried at boot time to determine which of the multiple
    	  implementations of sys_cache_flush() linked into the image is the
    	  correct one to use.
	  
    	  If the CPU's support (or lack thereof) of CLFLUSH is known in advance, then
    	  disable this option and set CLFLUSH_INSTRUCTION_SUPPORTED as appropriate.

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