From 8a487a4417221412d1cd23d4e08253fc9413be51 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Wed, 10 Oct 2012 13:12:53 +0000 Subject: [PATCH] x86: Add initial memory barrier macros These are available on other architectures, so add them on x86. Signed-off-by: Simon Glass --- arch/x86/include/asm/io.h | 8 ++++++++ 1 file changed, 8 insertions(+) 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 -- 2.7.4