com_lsr
if (inb(comc_port + com_lsr) & LSR_TXRDY) {
return (inb(comc_port + com_lsr) & LSR_RXRDY);
while (inb(comc_port + com_lsr) & LSR_RXRDY && ++tries < TRY_COUNT);
#define REG_LSR com_lsr