8 #define DEFAULT_SERIAL_PORT 0x3f8 /* ttyS0 */
10 #define DLAB		0x80
12 #define TXR             0       /*  Transmit register (WRITE) */
13 #define RXR             0       /*  Receive register  (READ)  */
21 #define DLL             0       /*  Divisor Latch Low         */
31 	outb(0x3, port + LCR);	/* 8n1 */  in early_serial_init()
32 	outb(0, port + IER);	/* no interrupt */  in early_serial_init()
33 	outb(0, port + FCR);	/* no fifo */  in early_serial_init()
34 	outb(0x3, port + MCR);	/* DTR + RTS */  in early_serial_init()
39 	outb(divisor & 0xff, port + DLL);  in early_serial_init()
40 	outb((divisor >> 8) & 0xff, port + DLH);  in early_serial_init()
50 	int pos = 0;  in parse_earlyprintk()
51 	int port = 0;  in parse_earlyprintk()
53 	if (cmdline_find_option("earlyprintk", arg, sizeof(arg)) > 0) {  in parse_earlyprintk()
66 		 *	"serial,0x3f8,115200"  in parse_earlyprintk()
70 		if (pos == 7 && !strncmp(arg + pos, "0x", 2)) {  in parse_earlyprintk()
72 			if (port == 0 || arg + pos == e)  in parse_earlyprintk()
77 			static const int bases[] = { 0x3f8, 0x2f8 };  in parse_earlyprintk()
78 			int idx = 0;  in parse_earlyprintk()
92 		baud = simple_strtoull(arg + pos, &e, 0);  in parse_earlyprintk()
93 		if (baud == 0 || arg + pos == e)  in parse_earlyprintk()
121 	int port = 0;  in parse_console_uart8250()
124 	 * console=uart8250,io,0x3f8,115200n8  in parse_console_uart8250()
127 	if (cmdline_find_option("console", optstr, sizeof(optstr)) <= 0)  in parse_console_uart8250()
133 		port = simple_strtoull(options + 12, &options, 0);  in parse_console_uart8250()
135 		port = simple_strtoull(options + 8, &options, 0);  in parse_console_uart8250()
139 	if (options && (options[0] == ','))  in parse_console_uart8250()
140 		baud = simple_strtoull(options + 1, &options, 0);  in parse_console_uart8250()