ioports.h

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#ifndef _IOPORTS_H_
#define _IOPORTS_H_

#define outb(value, port) \
  __asm__ volatile ("outb %b0,%w1" \
        ::"a" (value),"Nd" (port))

#define inb(port) \
({ \
  unsigned char _v; \
  __asm__ volatile ("inb %w1,%0" \
        :"=a" (_v) \
        :"Nd" (port)); \
  _v; \
})

#define outw(value, port) \
  __asm__ volatile ("outw %w0,%w1" \
        ::"a" (value),"Nd" (port)) 

#define inw(port) \
({ \
  unsigned int _v; \
  __asm__ volatile ("inw %w1,%w0" \
        :"=a" (_v) \
        :"Nd" (port)); \
  _v; \
})

#define outl(value, port) \
  __asm__ volatile ("outl %0,%w1" \
        ::"a" (value),"Nd" (port))

#define inl(port) \
({ \
  unsigned int _v; \
  __asm__ volatile ("inl %w1,%0" \
        :"=a" (_v) \
        :"Nd" (port)); \
  _v; \
})

#endif /* _IOPORTS_H_ */