diff --git a/kernel/serial.h b/kernel/serial.h
index cfaad95..1f7af5d 100644
--- a/kernel/serial.h
+++ b/kernel/serial.h
@@ -12,6 +12,10 @@ void serial_init();
 int serial_read(int port_no);
 int serial_read_nonblock(int port_no);
 void serial_write(int port_no, char a);
+#define serial_putchar serial_write
+
+int serial_getchar(int port_no);
+
 
 int serial_device_probe( int unit, int *blocksize, int *nblocks, char *info );
 int serial_device_read( int unit, void *data, int length, int offset );