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¶

SOC_APOLLO_LAKE || SOC_ATOM || SOC_IA32 || SOC_SERIES_QUARK_X1000 || (CACHE_FLUSHING && X86)

(Includes any dependencies from if’s and menus.)

Defaults¶

“y” if CACHE_FLUSHING && SOC_APOLLO_LAKE
“y” if CACHE_FLUSHING && SOC_ATOM
“y” if CACHE_FLUSHING && SOC_IA32
“y” if CACHE_FLUSHING && SOC_SERIES_QUARK_X1000

Kconfig definitions¶

At arch/x86/soc/apollo_lake/Kconfig.defconfig:19

Included via Kconfig:10 → Kconfig.zephyr:20

Menu path: (top menu)

config CLFLUSH_DETECT
    bool
    default "y" if CACHE_FLUSHING && SOC_APOLLO_LAKE
    depends on SOC_APOLLO_LAKE

At arch/x86/soc/atom/Kconfig.defconfig:18

Included via Kconfig:10 → Kconfig.zephyr:20

Menu path: (top menu)

config CLFLUSH_DETECT
    bool
    default "y" if CACHE_FLUSHING && SOC_ATOM
    depends on SOC_ATOM

At arch/x86/soc/ia32/Kconfig.defconfig:18

Included via Kconfig:10 → Kconfig.zephyr:20

Menu path: (top menu)

config CLFLUSH_DETECT
    bool
    default "y" if CACHE_FLUSHING && SOC_IA32
    depends on SOC_IA32

At arch/x86/soc/intel_quark/quark_x1000/Kconfig.defconfig.series:18

Included via Kconfig:10 → Kconfig.zephyr:20 → arch/x86/soc/intel_quark/Kconfig.defconfig:1

Menu path: (top menu)

config CLFLUSH_DETECT
    bool
    default "y" if CACHE_FLUSHING && SOC_SERIES_QUARK_X1000
    depends on SOC_SERIES_QUARK_X1000

At arch/x86/Kconfig:236

Included via Kconfig:10 → Kconfig.zephyr:23 → arch/Kconfig:16

Menu path: (top menu) → X86 Architecture Options → Processor Capabilities

config CLFLUSH_DETECT
    bool
    prompt "Detect support of CLFLUSH instruction at runtime" if CACHE_FLUSHING && X86
    depends on CACHE_FLUSHING && 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.

(Definitions include propagated dependencies, including from if’s and menus.)