source: npl/mediabox/lcdproc_edwin/src/server/drivers/port.h

/*-----------------------------------------------------------------------------
 * port.h (by damianf@wpi.edu)
 * Low level I/O functions taken from led-stat.txt
 * 
 * Jan 22 95
 *
 * DOS part (tested only with DOS version of GCC, DJGPP)
 * by M.Prinke <m.prinke@trashcan.mcnet.de> 3/97
 */

/* #define DOS */

#ifndef PORT_H
#define PORT_H
#endif

#ifndef DOS
static inline int port_in( int port )
{
   unsigned char value;
  __asm__ volatile ("inb %1,%0"
                    : "=a" (value)
                    : "d" ((unsigned short)port));
   return value;
}

static inline void port_out( unsigned short int port, unsigned char val )
{
  __asm__ volatile (
                    "outb %0,%1\n"
                    :
                    : "a" (val), "d" (port)
                    );
}
#else
#include <pc.h>

static inline int port_in( int port )
{
   unsigned char value;
   value = inportb((unsigned short) port);
   return (int)value;
}

static inline void port_out( unsigned int port, unsigned char val )
{
   outportb((unsigned short) port, val);
}
#endif

/**** END OF FILE ****/