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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¶
SOC_APOLLO_LAKE
|| SOC_ATOM
|| SOC_ELKHART_LAKE
|| SOC_IA32
|| (CACHE_MANAGEMENT
&& !X86_64
&& X86
)
(Includes any dependencies from ifs and menus.)
Defaults¶
y if
CACHE_MANAGEMENT
y if
CACHE_MANAGEMENT
y if
CACHE_MANAGEMENT
y if
CACHE_MANAGEMENT
Kconfig definitions¶
At <Zephyr>/soc/x86/apollo_lake/Kconfig.defconfig:44
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:19
→ <BuildDir>/Kconfig/Kconfig.soc.defconfig:1
Menu path: (Top)
config CLFLUSH_DETECT bool default y ifCACHE_MANAGEMENT
depends onSOC_APOLLO_LAKE
At <Zephyr>/soc/x86/atom/Kconfig.defconfig:14
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:19
→ <BuildDir>/Kconfig/Kconfig.soc.defconfig:1
Menu path: (Top)
config CLFLUSH_DETECT bool default y ifCACHE_MANAGEMENT
depends onSOC_ATOM
At <Zephyr>/soc/x86/elkhart_lake/Kconfig.defconfig:44
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:19
→ <BuildDir>/Kconfig/Kconfig.soc.defconfig:1
Menu path: (Top)
config CLFLUSH_DETECT bool default y ifCACHE_MANAGEMENT
depends onSOC_ELKHART_LAKE
At <Zephyr>/soc/x86/ia32/Kconfig.defconfig:14
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:19
→ <BuildDir>/Kconfig/Kconfig.soc.defconfig:1
Menu path: (Top)
config CLFLUSH_DETECT bool default y ifCACHE_MANAGEMENT
depends onSOC_IA32
At <Zephyr>/arch/x86/core/Kconfig.ia32:167
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:29
→ <Zephyr>/arch/Kconfig:12
→ <Zephyr>/arch/x86/Kconfig:326
Menu path: (Top) → X86 Architecture Options → Processor Capabilities
config CLFLUSH_DETECT bool "Detect support of CLFLUSH instruction at runtime" depends onCACHE_MANAGEMENT
&& !X86_64
&&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.)