Symbol: SB_OPTR_IMR0
drivers/tty/serial/8250/8250_pci.c
2148
outb(0xff, iobase + SB_OPTR_IMR0);
drivers/tty/serial/8250/8250_pci.c
2163
outb(0x00, iobase + SB_OPTR_IMR0);