diff --git a/include/minix/mmio.h b/include/minix/mmio.h
index 8c23a3520..60a41c952 100644
--- a/include/minix/mmio.h
+++ b/include/minix/mmio.h
@@ -1,6 +1,7 @@
 #ifndef __MMIO_H__
 #define __MMIO_H__
 
+#define REG16(x)(*((volatile uint16_t *)(x)))
 #define REG(x)(*((volatile uint32_t *)(x)))
 #define BIT(x)(0x1 << x)
 
@@ -30,4 +31,32 @@ set32(uint32_t address, uint32_t mask, uint32_t value)
 	val |= (value & mask);
 	write32(address, val);
 }
+
+/* Write a uint16_t value to a memory address. */
+static inline void
+write16(uint32_t address, uint16_t value)
+{
+	REG16(address) = value;
+}
+
+/* Read an uint16_t from a memory address */
+static inline uint16_t
+read16(uint32_t address)
+{
+	return REG16(address);
+}
+
+/* Set a 16 bits value depending on a mask */
+static inline void
+set16(uint32_t address, uint16_t mask, uint16_t value)
+{
+	uint16_t val;
+	val = read16(address);
+	/* clear the bits */
+	val &= ~(mask);
+	/* apply the value using the mask */
+	val |= (value & mask);
+	write16(address, val);
+}
+
 #endif /* __MMIO_H__ */