io.h

/*
 * I/O Ports
 *
 * Copyright (C) 2009-2011 Udo Steinberg <udo@hypervisor.org>
 * Economic rights: Technische Universitaet Dresden (Germany)
 *
 * This file is part of the NOVA microhypervisor.
 *
 * NOVA is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * NOVA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License version 2 for more details.
 */
 
#pragma once
 
#include "compiler.h"
 
class Io
{
    public:
        template <typename T>
        ALWAYS_INLINE
        static inline unsigned in (unsigned port)
        {
            T val;
            asm volatile ("in %w1, %0" : "=a" (val) : "Nd" (port));
            return val;
        }
 
        template <typename T>
        ALWAYS_INLINE
        static inline void out (unsigned port, T val)
        {
            asm volatile ("out %0, %w1" : : "a" (val), "Nd" (port));
        }
};