[U-Boot] [PATCH 12/20] x86: Add an mfence macro

Provide access to this x86 instruction from C code.

Signed-off-by: Simon Glass sjg@chromium.org ---

arch/x86/include/asm/cpu.h | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index c839291..37aa6b9 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -151,6 +151,11 @@ static inline int flag_is_changeable_p(uint32_t flag) return ((f1^f2) & flag) != 0; }

+static inline void mfence(void) +{ + __asm__ __volatile__("mfence\t\n" : : : "memory"); +} + /** * cpu_enable_paging_pae() - Enable PAE-paging *