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x86: Add initial memory barrier macros

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

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2012-10-10 13:12:53 +00:00
parent 8abebe3ead
commit 8a487a4417
1 changed files with 8 additions and 0 deletions
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8
arch/x86/include/asm/io.h
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@ -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