struct parport {
  /* An artibrary name for the port. */
  const char *name;
  /* The base address of the port, if that has any meaning, or zero. */
  unsigned long base_addr;
  /* The ECR address of the port, if that has any meaning, or zero. */
  unsigned long hibase_addr;
  /* The filename associated with this port,
   * if that has any meaning, or NULL. */
  const char *filename;
};