E1000_EXTCNF_CTRL_SWFLAG
if (!(extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG))
extcnf_ctrl |= E1000_EXTCNF_CTRL_SWFLAG;
if (extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG)
extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
if (extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG) {
extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;