unsigned char port_byte_in(unsigned short port) {
  unsigned char result;
  asm("in %%dx, %%al":"=a"(result):"d"(port));
  return result;
}

void port_byte_out(unsigned short port,unsigned char data) {
  asm("out %%al, %%dx":: "a"(data),"d"(port));
}

unsigned short port_word_in(unsigned short port) {
  unsigned short result;
  asm("in %%dx, %%ax":"=a"(result):"d"(port));
  return result;
}

void port_word_out(unsigned short port,unsigned short data) {
  asm("out %%ax, %%dx":: "a" (data), "d" (port));
}

unsigned long port_long_in(unsigned short port) {
  unsigned long result;
  asm("inl %%dx, %%eax":"=a"(result):"d"(port));
  return result;
}

void port_long_out(unsigned short port,unsigned long data) {
  asm("outl %%eax, %%dx":: "a" (data), "d" (port));
}