--- /dev/null
+#ifndef _SYS_IO_H
+#define _SYS_IO_H
+
+#include <inttypes.h>
+
+static inline uint8_t inb(uint16_t p)
+{
+ uint8_t v;
+ asm volatile("inb %1,%0" : "=a" (v) : "Nd" (p));
+ return v;
+}
+
+static inline uint16_t inw(uint16_t p)
+{
+ uint16_t v;
+ asm volatile("inw %1,%0" : "=a" (v) : "Nd" (p));
+ return v;
+}
+
+static inline uint32_t inl(uint16_t p)
+{
+ uint32_t v;
+ asm volatile("inl %1,%0" : "=a" (v) : "Nd" (p));
+ return v;
+}
+
+static inline void outb(uint8_t v, uint16_t p)
+{
+ asm volatile("outb %0,%1" : : "a" (v), "Nd" (p));
+}
+
+static inline void outw(uint16_t v, uint16_t p)
+{
+ asm volatile("outw %0,%1" : : "a" (v), "Nd" (p));
+}
+
+static inline void outl(uint32_t v, uint16_t p)
+{
+ asm volatile("outl %0,%1" : : "a" (v), "Nd" (p));
+}
+
+#endif /* _SYS_IO_H */