120 struct console {  struct
122 	void	(*write)(struct console *, const char *, unsigned);  argument
123 	int	(*read)(struct console *, char *, unsigned);  argument
124 	struct tty_driver *(*device)(struct console *, int *);  argument
126 	int	(*setup)(struct console *, char *);  argument
127 	int	(*match)(struct console *, char *name, int idx, char *options);  argument
132 	struct	 console *next;  argument
142 extern struct console *early_console;
145 extern void register_console(struct console *);
146 extern int unregister_console(struct console *);
147 extern struct console *console_drivers;
155 extern void console_stop(struct console *);
156 extern void console_start(struct console *);
158 extern int braille_register_console(struct console *, int index,
160 extern int braille_unregister_console(struct console *);