Index: uspace/lib/c/arch/ia32/include/ddi.h
===================================================================
--- uspace/lib/c/arch/ia32/include/ddi.h	(revision 32186484f4f5808dccfde6e81e49e0d997ddb762)
+++ uspace/lib/c/arch/ia32/include/ddi.h	(revision d27a9c8f596ca95ee3af967261abc7c7ede2fa69)
@@ -39,5 +39,5 @@
 #define IO_SPACE_BOUNDARY  ((void *) (64 * 1024))
 
-static inline uint8_t arch_pio_read_8(ioport8_t *port)
+static inline uint8_t arch_pio_read_8(const ioport8_t *port)
 {
 	if (port < (ioport8_t *) IO_SPACE_BOUNDARY) {
@@ -55,5 +55,5 @@
 }
 
-static inline uint16_t arch_pio_read_16(ioport16_t *port)
+static inline uint16_t arch_pio_read_16(const ioport16_t *port)
 {
 	if (port < (ioport16_t *) IO_SPACE_BOUNDARY) {
@@ -71,5 +71,5 @@
 }
 
-static inline uint32_t arch_pio_read_32(ioport32_t *port)
+static inline uint32_t arch_pio_read_32(const ioport32_t *port)
 {
 	if (port < (ioport32_t *) IO_SPACE_BOUNDARY) {