tag	line	file	source code
UART_LCR_SBC	170	kernel/chr_drv/serial.c	outb_p(inb_p(port) | UART_LCR_SBC, port);
UART_LCR_SBC	172	kernel/chr_drv/serial.c	outb(inb_p(port) & ~UART_LCR_SBC, port);