Index: uspace/lib/c/arch/ppc32/include/ddi.h
===================================================================
--- uspace/lib/c/arch/ppc32/include/ddi.h	(revision 32186484f4f5808dccfde6e81e49e0d997ddb762)
+++ uspace/lib/c/arch/ppc32/include/ddi.h	(revision 297cb737a128894be4e31ffafb7da3e0005ff683)
@@ -52,15 +52,15 @@
 }
 
-static inline uint8_t arch_pio_read_8(ioport8_t *port)
+static inline uint8_t arch_pio_read_8(const ioport8_t *port)
 {
 	return *port;
 }
 
-static inline uint16_t arch_pio_read_16(ioport16_t *port)
+static inline uint16_t arch_pio_read_16(const ioport16_t *port)
 {
 	return *port;
 }
 
-static inline uint32_t arch_pio_read_32(ioport32_t *port)
+static inline uint32_t arch_pio_read_32(const ioport32_t *port)
 {
 	return *port;