--- /dev/null
+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ * IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#ifndef IOLIB_H
+#define IOLIB_H
+
+#include <stdint.h>
+
+#define addr_t volatile unsigned int
+#define addr8_t volatile unsigned char
+
+extern void halt_sys (unsigned int);
+
+extern void uart_send_byte(unsigned char b);
+extern void io_putchar(unsigned char);
+
+#endif