+#ifndef _16550_H_
+#define _16550_H_
+
+#include "vend.h"
+
+/* Must be accessed with DLAB low */
+#define UART_RX_BUF 0x00 /* read */
+#define UART_TX_BUF 0x00 /* write */
+#define UART_INT_ENABLE 0x01
+#define UART_INT_IDENT 0x02 /* read */
+#define UART_FIFO_CTL 0x02 /* write */
+#define UART_LINE_CTL 0x03
+#define UART_MODEM_CTL 0x04
+#define UART_LINE_STATUS 0x05
+#define UART_MODEM_STATUS 0x06
+#define UART_SCRATCH 0x07
+
+/* Same addresses as above, but accessed with DLAB high */
+#define UART_DLAB_LSB 0x00
+#define UART_DLAB_MSB 0x01
+
+extern volatile u8 _uart_regs[]; /* UART registers - fixed at link time */
+
+#endif /* _16550_H_ */