diff --git a/src/include/mmio.h b/src/include/mmio.h
new file mode 100644
index 0000000000..4f2c806cac
--- /dev/null
+++ b/src/include/mmio.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * mmio.h provides update*() as well as read/write*() from arch/mmio.h
+ */
+
+#ifndef __MMIO_H__
+#define __MMIO_H__
+
+#include <arch/mmio.h>
+#include <stdint.h>
+
+static __always_inline void update8(volatile void *addr, uint8_t mask, uint8_t or)
+{
+	uint8_t reg = read8(addr);
+	reg = (reg & mask) | or;
+	write8(addr, reg);
+}
+
+static __always_inline void update16(volatile void *addr, uint16_t mask, uint16_t or)
+{
+	uint16_t reg = read16(addr);
+	reg = (reg & mask) | or;
+	write16(addr, reg);
+}
+
+static __always_inline void update32(volatile void *addr, uint32_t mask, uint32_t or)
+{
+	uint32_t reg = read32(addr);
+	reg = (reg & mask) | or;
+	write32(addr, reg);
+}
+
+#endif /* __MMIO_H__ */