Index: uspace/lib/c/include/ddi.h
===================================================================
--- uspace/lib/c/include/ddi.h	(revision 0aae87a68b103134fdc85e357962274d6849b220)
+++ uspace/lib/c/include/ddi.h	(revision 711a38b37af771adb8914e35f8d91da5b5d2ef07)
@@ -36,5 +36,7 @@
 #define LIBC_DDI_H_
 
+#include <bool.h>
 #include <sys/types.h>
+#include <sys/time.h>
 #include <abi/ddi/irq.h>
 #include <task.h>
@@ -50,6 +52,73 @@
 extern int dmamem_unmap_anonymous(void *);
 
-extern int iospace_enable(task_id_t, void *, unsigned long);
 extern int pio_enable(void *, size_t, void **);
+
+typedef void (*trace_fnc)(const volatile void *place, uint32_t val,
+    volatile void* base, size_t size, void *data, bool write);
+
+extern int pio_trace_enable(void *, size_t, trace_fnc, void *);
+extern void pio_trace_log(const volatile void *, uint32_t val, bool write);
+extern void pio_trace_disable(void *);
+
+extern void pio_write_8(ioport8_t *, uint8_t);
+extern void pio_write_16(ioport16_t *, uint16_t);
+extern void pio_write_32(ioport32_t *, uint32_t);
+
+extern uint8_t pio_read_8(const ioport8_t *);
+extern uint16_t pio_read_16(const ioport16_t *);
+extern uint32_t pio_read_32(const ioport32_t *);
+
+static inline uint8_t pio_change_8(
+    ioport8_t *reg, uint8_t val, uint8_t mask, useconds_t delay)
+{
+	uint8_t v = pio_read_8(reg);
+	udelay(delay);
+	pio_write_8(reg, (v & ~mask) | val);
+	return v;
+}
+
+static inline uint16_t pio_change_16(
+    ioport16_t *reg, uint16_t val, uint16_t mask, useconds_t delay)
+{
+	uint16_t v = pio_read_16(reg);
+	udelay(delay);
+	pio_write_16(reg, (v & ~mask) | val);
+	return v;
+}
+
+static inline uint32_t pio_change_32(
+    ioport32_t *reg, uint32_t val, uint32_t mask, useconds_t delay)
+{
+	uint32_t v = pio_read_32(reg);
+	udelay(delay);
+	pio_write_32(reg, (v & ~mask) | val);
+	return v;
+}
+
+static inline uint8_t pio_set_8(ioport8_t *r, uint8_t v, useconds_t d)
+{
+	return pio_change_8(r, v, 0, d);
+}
+static inline uint16_t pio_set_16(ioport16_t *r, uint16_t v, useconds_t d)
+{
+	return pio_change_16(r, v, 0, d);
+}
+static inline uint32_t pio_set_32(ioport32_t *r, uint32_t v, useconds_t d)
+{
+	return pio_change_32(r, v, 0, d);
+}
+
+static inline uint8_t pio_clear_8(ioport8_t *r, uint8_t v, useconds_t d)
+{
+	return pio_change_8(r, 0, v, d);
+}
+static inline uint16_t pio_clear_16(ioport16_t *r, uint16_t v, useconds_t d)
+{
+	return pio_change_16(r, 0, v, d);
+}
+static inline uint32_t pio_clear_32(ioport32_t *r, uint32_t v, useconds_t d)
+{
+	return pio_change_32(r, 0, v, d);
+}
 
 extern int irq_register(int, int, int, irq_code_t *);
Index: uspace/lib/c/include/macros.h
===================================================================
--- uspace/lib/c/include/macros.h	(revision 0aae87a68b103134fdc85e357962274d6849b220)
+++ uspace/lib/c/include/macros.h	(revision 711a38b37af771adb8914e35f8d91da5b5d2ef07)
@@ -62,4 +62,10 @@
 #endif
 
+#define _paddname(line) PADD_ ## line ## __
+#define _padd(width, line) uint ## width ## _t _paddname(line)
+#define PADD32 _padd(32, __LINE__)
+#define PADD16 _padd(16, __LINE__)
+#define PADD8 _padd(8, __LINE__)
+
 /** @}
  */