com_lsr
sp->ioaddr + com_lsr, 1, &data);
EFI_ISA_ACPI_MEMORY_WIDTH_8_BIT, sp->ioaddr + com_lsr,
sp->ioaddr + com_lsr, 1, &control);
if (inb(sp->ioaddr + com_lsr) & LSR_TXRDY) {
return (inb(sp->ioaddr + com_lsr) & LSR_RXRDY);
} while (inb(sp->ioaddr + com_lsr) & LSR_RXRDY && ++tries < TRY_COUNT);
#define REG_LSR com_lsr