[U-Boot] [RFC PATCH 17/19] x86: Add initial memory barrier macros

These are available on other architecures, so add them on x86.

Signed-off-by: Simon Glass sjg@chromium.org --- arch/x86/include/asm/io.h | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 9b757d4..b12bdd8 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -234,4 +234,12 @@ static inline phys_addr_t virt_to_phys(void * vaddr) return (phys_addr_t)(vaddr); }

+/* + * TODO: The kernel offers some more advanced versions of barriers, it might + * have some advantages to use them instead of the simple one here. + */ +#define dmb() __asm__ __volatile__ ("" : : : "memory") +#define __iormb() dmb() +#define __iowmb() dmb() + #endif