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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¶
!CLFLUSH_DETECT && CACHE_FLUSHING && X86
(Includes any dependencies from if’s and menus.)
Defaults¶
No defaults. Implicitly defaults to n.
Kconfig definition¶
At arch/x86/Kconfig:267
Included via Kconfig:10 → Kconfig.zephyr:29 → arch/Kconfig:15
Menu path: (top menu) → X86 Architecture Options → Processor Capabilities
config CLFLUSH_INSTRUCTION_SUPPORTED
bool
prompt "CLFLUSH instruction supported" if !CLFLUSH_DETECT && CACHE_FLUSHING && X86
depends on !CLFLUSH_DETECT && CACHE_FLUSHING && 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.
(Definitions include propagated dependencies, including from if’s and menus.)