1. 根目录:
2. include
3. linux
4. vt_kern.h

#ifndef _VT_KERN_H
#define _VT_KERN_H

/*
 * this really is an extension of the vc_cons structure in console.c, but
 * with information needed by the vt package
 */

#include <linux/vt.h>
#include <linux/kd.h>
#include <linux/tty.h>
#include <linux/mutex.h>
#include <linux/console_struct.h>
#include <linux/mm.h>
#include <linux/consolemap.h>
#include <linux/notifier.h>

/*
 * Presently, a lot of graphics programs do not restore the contents of
 * the higher font pages.  Defining this flag will avoid use of them, but
 * will lose support for PIO_FONTRESET.  Note that many font operations are
 * not likely to work with these programs anyway; they need to be
 * fixed.  The linux/Documentation directory includes a code snippet
 * to save and restore the text font.
 */
#ifdef CONFIG_VGA_CONSOLE
#define BROKEN_GRAPHICS_PROGRAMS 1
#endif

extern void kd_mksound(unsigned int hz, unsigned int ticks);
extern int kbd_rate(struct kbd_repeat *rep);
extern int fg_console, last_console, want_console;

/* console.c */

int vc_allocate(unsigned int console);
int vc_cons_allocated(unsigned int console);
int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines);
void vc_deallocate(unsigned int console);
void reset_palette(struct vc_data *vc);
void do_blank_screen(int entering_gfx);
void do_unblank_screen(int leaving_gfx);
void unblank_screen(void);
void poke_blanked_console(void);
int con_font_op(struct vc_data *vc, struct console_font_op *op);
int con_set_cmap(unsigned char __user *cmap);
int con_get_cmap(unsigned char __user *cmap);
void scrollback(struct vc_data *vc, int lines);
void scrollfront(struct vc_data *vc, int lines);
void update_region(struct vc_data *vc, unsigned long start, int count);
void redraw_screen(struct vc_data *vc, int is_switch);
#define update_screen(x) redraw_screen(x, 0)
#define switch_screen(x) redraw_screen(x, 1)

struct tty_struct;
int tioclinux(struct tty_struct *tty, unsigned long arg);

#ifdef CONFIG_CONSOLE_TRANSLATIONS
/* consolemap.c */

struct unimapinit;
struct unipair;

int con_set_trans_old(unsigned char __user * table);
int con_get_trans_old(unsigned char __user * table);
int con_set_trans_new(unsigned short __user * table);
int con_get_trans_new(unsigned short __user * table);
int con_clear_unimap(struct vc_data *vc, struct unimapinit *ui);
int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list);
int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list);
int con_set_default_unimap(struct vc_data *vc);
void con_free_unimap(struct vc_data *vc);
void con_protect_unimap(struct vc_data *vc, int rdonly);
int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc);

#define vc_translate(vc, c) ((vc)->vc_translate[(c) |			\
					((vc)->vc_toggle_meta ? 0x80 : 0)])
#else
static inline int con_set_trans_old(unsigned char __user *table)
{
	return 0;
}
static inline int con_get_trans_old(unsigned char __user *table)
{
	return -EINVAL;
}
static inline int con_set_trans_new(unsigned short __user *table)
{
	return 0;
}
static inline int con_get_trans_new(unsigned short __user *table)
{
	return -EINVAL;
}
static inline int con_clear_unimap(struct vc_data *vc, struct unimapinit *ui)
{
	return 0;
}
static inline
int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
{
	return 0;
}
static inline
int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct,
		   struct unipair __user *list)
{
	return -EINVAL;
}
static inline int con_set_default_unimap(struct vc_data *vc)
{
	return 0;
}
static inline void con_free_unimap(struct vc_data *vc)
{
}
static inline void con_protect_unimap(struct vc_data *vc, int rdonly)
{
}
static inline
int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
{
	return 0;
}

#define vc_translate(vc, c) (c)
#endif

/* vt.c */
void vt_event_post(unsigned int event, unsigned int old, unsigned int new);
int vt_waitactive(int n);
void change_console(struct vc_data *new_vc);
void reset_vc(struct vc_data *vc);
extern int unbind_con_driver(const struct consw *csw, int first, int last,
			     int deflt);
int vty_init(const struct file_operations *console_fops);

static inline bool vt_force_oops_output(struct vc_data *vc)
{
	if (oops_in_progress && vc->vc_panic_force_write)
		return true;
	return false;
}

extern char vt_dont_switch;
extern int default_utf8;
extern int global_cursor_default;

struct vt_spawn_console {
	spinlock_t lock;
	struct pid *pid;
	int sig;
};
extern struct vt_spawn_console vt_spawn_con;

extern int vt_move_to_console(unsigned int vt, int alloc);

/* Interfaces for VC notification of character events (for accessibility etc) */

struct vt_notifier_param {
	struct vc_data *vc;	/* VC on which the update happened */
	unsigned int c;		/* Printed char */
};

extern int register_vt_notifier(struct notifier_block *nb);
extern int unregister_vt_notifier(struct notifier_block *nb);

extern void hide_boot_cursor(bool hide);

#endif /* _VT_KERN_H */