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authorSimon Glass <sjg@chromium.org>2012-10-10 13:12:53 +0000
committerSimon Glass <sjg@chromium.org>2012-11-28 11:40:03 -0800
commit8a487a4417221412d1cd23d4e08253fc9413be51 (patch)
tree853821ae5b83367759d54912cba48fe893b04f6a
parent8abebe3eadb35222a1147078da4010b4cbfe5858 (diff)
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x86: Add initial memory barrier macros
These are available on other architectures, so add them on x86. Signed-off-by: Simon Glass <sjg@chromium.org>
-rw-r--r--arch/x86/include/asm/io.h8
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