E1000_PBA
#define E1000_82542_PBA E1000_PBA
regs_buff[8] = rd32(E1000_PBA);
wr32(E1000_PBA, pba);
needed_tx_space = min_tx_space - (rd32(E1000_PBA) >> 16);
wr32(E1000_PBA, pba);