#include <linux/console.h>#include <linux/init.h>#include <linux/serial_reg.h>#include <asm/io.h>#define PORT(offset) (0x3f8 + (offset))static inline unsigned int serial_in(int offset){	return inb(PORT(offset));}static inline void serial_out(int offset, int value){	outb(value, PORT(offset));}int prom_putchar(char c){	while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)		;	serial_out(UART_TX, c);	return 1;}