diff --git a/include/reg.h b/include/reg.h
index d04d4ea..b5dd528 100644
--- a/include/reg.h
+++ b/include/reg.h
@@ -39,4 +39,6 @@
 #define writel(v, a) (*REG32(a) = (v))
 #define readl(a) (*REG32(a))
 
+#define writeb(v, a) (*REG8(a) = (v))
+#define readb(a) (*REG8(a))
 #endif