Index: uspace/lib/libc/include/sys/types.h
===================================================================
--- uspace/lib/libc/include/sys/types.h	(revision 72bde81acaa9c2c39b124ad814001c2046dbb66d)
+++ uspace/lib/libc/include/sys/types.h	(revision 46db10e9dce687ab447a98a868f099f0b792fcd5)
@@ -43,4 +43,8 @@
 typedef int mode_t;
 
+typedef volatile uint8_t ioport8_t;
+typedef volatile uint16_t ioport16_t;
+typedef volatile uint32_t ioport32_t;
+
 #endif