io_regblock_port.h

/*
 * Copyright (C) 2012 Technische Universität Dresden.
 * Author(s): Adam Lackorzynski <adam@os.inf.tu-dresden.de>
 *
 * License: see LICENSE.spdx (in this directory or the directories above)
 */
#pragma once
 
#include "io_regblock.h"
 
namespace L4
{
  class Io_register_block_port : public Io_register_block
  {
  public:
    Io_register_block_port(unsigned long base)
    : _base(base)
    {}
 
    unsigned long addr(unsigned long reg) const override { return _base + reg; }
 
    unsigned char  read8(unsigned long reg) const override
    {
      unsigned char val;
      asm volatile("inb %w1, %b0" : "=a" (val) : "Nd" (_base + reg));
      return val;
    }
 
    unsigned short read16(unsigned long reg) const override
    {
      unsigned short val;
      asm volatile("inw %w1, %w0" : "=a" (val) : "Nd" (_base + reg));
      return val;
    }
 
    unsigned int   read32(unsigned long reg) const override
    {
      unsigned int val;
      asm volatile("in %w1, %0" : "=a" (val) : "Nd" (_base + reg));
      return val;
    }
 
    void write8(unsigned long reg, unsigned char val) const override
    { asm volatile("outb %b0, %w1" : : "a" (val), "Nd" (_base + reg)); }
 
    void write16(unsigned long reg, unsigned short val) const override
    { asm volatile("outw %w0, %w1" : : "a" (val), "Nd" (_base + reg)); }
 
    void write32(unsigned long reg, unsigned int val) const override
    { asm volatile("out %0, %w1" : : "a" (val), "Nd" (_base + reg)); }
 
    void delay() const override
    { asm volatile ("outb %al,$0x80"); }
 
  private:
    unsigned long _base;
  };
}