Merge branch 'master' into upstream

1 files changed, 4209 insertions, 0 deletions

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
new file mode 100644
index 000000000000..a8ec48ed14d9
--- /dev/null
+++ b/drivers/tty/vt/vt.c
@@ -0,0 +1,4209 @@
+/*
+ *  linux/drivers/char/vt.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+/*
+ * Hopefully this will be a rather complete VT102 implementation.
+ *
+ * Beeping thanks to John T Kohl.
+ *
+ * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
+ *   Chars, and VT100 enhancements by Peter MacDonald.
+ *
+ * Copy and paste function by Andrew Haylett,
+ *   some enhancements by Alessandro Rubini.
+ *
+ * Code to check for different video-cards mostly by Galen Hunt,
+ * <g-hunt@ee.utah.edu>
+ *
+ * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
+ * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
+ *
+ * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
+ * Resizing of consoles, aeb, 940926
+ *
+ * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
+ * <poe@daimi.aau.dk>
+ *
+ * User-defined bell sound, new setterm control sequences and printk
+ * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
+ *
+ * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
+ *
+ * Merge with the abstract console driver by Geert Uytterhoeven
+ * <geert@linux-m68k.org>, Jan 1997.
+ *
+ *   Original m68k console driver modifications by
+ *
+ *     - Arno Griffioen <arno@usn.nl>
+ *     - David Carter <carter@cs.bris.ac.uk>
+ * 
+ *   The abstract console driver provides a generic interface for a text
+ *   console. It supports VGA text mode, frame buffer based graphical consoles
+ *   and special graphics processors that are only accessible through some
+ *   registers (e.g. a TMS340x0 GSP).
+ *
+ *   The interface to the hardware is specified using a special structure
+ *   (struct consw) which contains function pointers to console operations
+ *   (see <linux/console.h> for more information).
+ *
+ * Support for changeable cursor shape
+ * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
+ *
+ * Ported to i386 and con_scrolldelta fixed
+ * by Emmanuel Marty <core@ggi-project.org>, April 1998
+ *
+ * Resurrected character buffers in videoram plus lots of other trickery
+ * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
+ *
+ * Removed old-style timers, introduced console_timer, made timer
+ * deletion SMP-safe.  17Jun00, Andrew Morton
+ *
+ * Removed console_lock, enabled interrupts across all console operations
+ * 13 March 2001, Andrew Morton
+ *
+ * Fixed UTF-8 mode so alternate charset modes always work according
+ * to control sequences interpreted in do_con_trol function
+ * preserving backward VT100 semigraphics compatibility,
+ * malformed UTF sequences represented as sequences of replacement glyphs,
+ * original codes or '?' as a last resort if replacement glyph is undefined
+ * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/kd.h>
+#include <linux/slab.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/vt_kern.h>
+#include <linux/selection.h>
+#include <linux/smp_lock.h>
+#include <linux/tiocl.h>
+#include <linux/kbd_kern.h>
+#include <linux/consolemap.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/pm.h>
+#include <linux/font.h>
+#include <linux/bitops.h>
+#include <linux/notifier.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <asm/system.h>
+#include <linux/uaccess.h>
+#include <linux/kdb.h>
+#include <linux/ctype.h>
+
+#define MAX_NR_CON_DRIVER 16
+
+#define CON_DRIVER_FLAG_MODULE 1
+#define CON_DRIVER_FLAG_INIT   2
+#define CON_DRIVER_FLAG_ATTR   4
+
+struct con_driver {
+	const struct consw *con;
+	const char *desc;
+	struct device *dev;
+	int node;
+	int first;
+	int last;
+	int flag;
+};
+
+static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
+const struct consw *conswitchp;
+
+/* A bitmap for codes <32. A bit of 1 indicates that the code
+ * corresponding to that bit number invokes some special action
+ * (such as cursor movement) and should not be displayed as a
+ * glyph unless the disp_ctrl mode is explicitly enabled.
+ */
+#define CTRL_ACTION 0x0d00ff81
+#define CTRL_ALWAYS 0x0800f501	/* Cannot be overridden by disp_ctrl */
+
+/*
+ * Here is the default bell parameters: 750HZ, 1/8th of a second
+ */
+#define DEFAULT_BELL_PITCH	750
+#define DEFAULT_BELL_DURATION	(HZ/8)
+
+struct vc vc_cons [MAX_NR_CONSOLES];
+
+#ifndef VT_SINGLE_DRIVER
+static const struct consw *con_driver_map[MAX_NR_CONSOLES];
+#endif
+
+static int con_open(struct tty_struct *, struct file *);
+static void vc_init(struct vc_data *vc, unsigned int rows,
+		    unsigned int cols, int do_clear);
+static void gotoxy(struct vc_data *vc, int new_x, int new_y);
+static void save_cur(struct vc_data *vc);
+static void reset_terminal(struct vc_data *vc, int do_clear);
+static void con_flush_chars(struct tty_struct *tty);
+static int set_vesa_blanking(char __user *p);
+static void set_cursor(struct vc_data *vc);
+static void hide_cursor(struct vc_data *vc);
+static void console_callback(struct work_struct *ignored);
+static void blank_screen_t(unsigned long dummy);
+static void set_palette(struct vc_data *vc);
+
+static int printable;		/* Is console ready for printing? */
+int default_utf8 = true;
+module_param(default_utf8, int, S_IRUGO | S_IWUSR);
+int global_cursor_default = -1;
+module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
+
+static int cur_default = CUR_DEFAULT;
+module_param(cur_default, int, S_IRUGO | S_IWUSR);
+
+/*
+ * ignore_poke: don't unblank the screen when things are typed.  This is
+ * mainly for the privacy of braille terminal users.
+ */
+static int ignore_poke;
+
+int do_poke_blanked_console;
+int console_blanked;
+
+static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
+static int vesa_off_interval;
+static int blankinterval = 10*60;
+core_param(consoleblank, blankinterval, int, 0444);
+
+static DECLARE_WORK(console_work, console_callback);
+
+/*
+ * fg_console is the current virtual console,
+ * last_console is the last used one,
+ * want_console is the console we want to switch to,
+ * saved_* variants are for save/restore around kernel debugger enter/leave
+ */
+int fg_console;
+int last_console;
+int want_console = -1;
+static int saved_fg_console;
+static int saved_last_console;
+static int saved_want_console;
+static int saved_vc_mode;
+static int saved_console_blanked;
+
+/*
+ * For each existing display, we have a pointer to console currently visible
+ * on that display, allowing consoles other than fg_console to be refreshed
+ * appropriately. Unless the low-level driver supplies its own display_fg
+ * variable, we use this one for the "master display".
+ */
+static struct vc_data *master_display_fg;
+
+/*
+ * Unfortunately, we need to delay tty echo when we're currently writing to the
+ * console since the code is (and always was) not re-entrant, so we schedule
+ * all flip requests to process context with schedule-task() and run it from
+ * console_callback().
+ */
+
+/*
+ * For the same reason, we defer scrollback to the console callback.
+ */
+static int scrollback_delta;
+
+/*
+ * Hook so that the power management routines can (un)blank
+ * the console on our behalf.
+ */
+int (*console_blank_hook)(int);
+
+static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
+static int blank_state;
+static int blank_timer_expired;
+enum {
+	blank_off = 0,
+	blank_normal_wait,
+	blank_vesa_wait,
+};
+
+/*
+ * Notifier list for console events.
+ */
+static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
+
+int register_vt_notifier(struct notifier_block *nb)
+{
+	return atomic_notifier_chain_register(&vt_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_vt_notifier);
+
+int unregister_vt_notifier(struct notifier_block *nb)
+{
+	return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_vt_notifier);
+
+static void notify_write(struct vc_data *vc, unsigned int unicode)
+{
+	struct vt_notifier_param param = { .vc = vc, unicode = unicode };
+	atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
+}
+
+static void notify_update(struct vc_data *vc)
+{
+	struct vt_notifier_param param = { .vc = vc };
+	atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
+}
+/*
+ *	Low-Level Functions
+ */
+
+#define IS_FG(vc)	((vc)->vc_num == fg_console)
+
+#ifdef VT_BUF_VRAM_ONLY
+#define DO_UPDATE(vc)	0
+#else
+#define DO_UPDATE(vc)	(CON_IS_VISIBLE(vc) && !console_blanked)
+#endif
+
+static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
+{
+	unsigned short *p;
+	
+	if (!viewed)
+		p = (unsigned short *)(vc->vc_origin + offset);
+	else if (!vc->vc_sw->con_screen_pos)
+		p = (unsigned short *)(vc->vc_visible_origin + offset);
+	else
+		p = vc->vc_sw->con_screen_pos(vc, offset);
+	return p;
+}
+
+/* Called  from the keyboard irq path.. */
+static inline void scrolldelta(int lines)
+{
+	/* FIXME */
+	/* scrolldelta needs some kind of consistency lock, but the BKL was
+	   and still is not protecting versus the scheduled back end */
+	scrollback_delta += lines;
+	schedule_console_callback();
+}
+
+void schedule_console_callback(void)
+{
+	schedule_work(&console_work);
+}
+
+static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
+{
+	unsigned short *d, *s;
+
+	if (t+nr >= b)
+		nr = b - t - 1;
+	if (b > vc->vc_rows || t >= b || nr < 1)
+		return;
+	if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
+		return;
+	d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
+	s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
+	scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
+	scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
+		    vc->vc_size_row * nr);
+}
+
+static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
+{
+	unsigned short *s;
+	unsigned int step;
+
+	if (t+nr >= b)
+		nr = b - t - 1;
+	if (b > vc->vc_rows || t >= b || nr < 1)
+		return;
+	if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
+		return;
+	s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
+	step = vc->vc_cols * nr;
+	scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
+	scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
+}
+
+static void do_update_region(struct vc_data *vc, unsigned long start, int count)
+{
+#ifndef VT_BUF_VRAM_ONLY
+	unsigned int xx, yy, offset;
+	u16 *p;
+
+	p = (u16 *) start;
+	if (!vc->vc_sw->con_getxy) {
+		offset = (start - vc->vc_origin) / 2;
+		xx = offset % vc->vc_cols;
+		yy = offset / vc->vc_cols;
+	} else {
+		int nxx, nyy;
+		start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
+		xx = nxx; yy = nyy;
+	}
+	for(;;) {
+		u16 attrib = scr_readw(p) & 0xff00;
+		int startx = xx;
+		u16 *q = p;
+		while (xx < vc->vc_cols && count) {
+			if (attrib != (scr_readw(p) & 0xff00)) {
+				if (p > q)
+					vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
+				startx = xx;
+				q = p;
+				attrib = scr_readw(p) & 0xff00;
+			}
+			p++;
+			xx++;
+			count--;
+		}
+		if (p > q)
+			vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
+		if (!count)
+			break;
+		xx = 0;
+		yy++;
+		if (vc->vc_sw->con_getxy) {
+			p = (u16 *)start;
+			start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
+		}
+	}
+#endif
+}
+
+void update_region(struct vc_data *vc, unsigned long start, int count)
+{
+	WARN_CONSOLE_UNLOCKED();
+
+	if (DO_UPDATE(vc)) {
+		hide_cursor(vc);
+		do_update_region(vc, start, count);
+		set_cursor(vc);
+	}
+}
+
+/* Structure of attributes is hardware-dependent */
+
+static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
+    u8 _underline, u8 _reverse, u8 _italic)
+{
+	if (vc->vc_sw->con_build_attr)
+		return vc->vc_sw->con_build_attr(vc, _color, _intensity,
+		       _blink, _underline, _reverse, _italic);
+
+#ifndef VT_BUF_VRAM_ONLY
+/*
+ * ++roman: I completely changed the attribute format for monochrome
+ * mode (!can_do_color). The formerly used MDA (monochrome display
+ * adapter) format didn't allow the combination of certain effects.
+ * Now the attribute is just a bit vector:
+ *  Bit 0..1: intensity (0..2)
+ *  Bit 2   : underline
+ *  Bit 3   : reverse
+ *  Bit 7   : blink
+ */
+	{
+	u8 a = _color;
+	if (!vc->vc_can_do_color)
+		return _intensity |
+		       (_italic ? 2 : 0) |
+		       (_underline ? 4 : 0) |
+		       (_reverse ? 8 : 0) |
+		       (_blink ? 0x80 : 0);
+	if (_italic)
+		a = (a & 0xF0) | vc->vc_itcolor;
+	else if (_underline)
+		a = (a & 0xf0) | vc->vc_ulcolor;
+	else if (_intensity == 0)
+		a = (a & 0xf0) | vc->vc_ulcolor;
+	if (_reverse)
+		a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
+	if (_blink)
+		a ^= 0x80;
+	if (_intensity == 2)
+		a ^= 0x08;
+	if (vc->vc_hi_font_mask == 0x100)
+		a <<= 1;
+	return a;
+	}
+#else
+	return 0;
+#endif
+}
+
+static void update_attr(struct vc_data *vc)
+{
+	vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
+	              vc->vc_blink, vc->vc_underline,
+	              vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
+	vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
+}
+
+/* Note: inverting the screen twice should revert to the original state */
+void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
+{
+	unsigned short *p;
+
+	WARN_CONSOLE_UNLOCKED();
+
+	count /= 2;
+	p = screenpos(vc, offset, viewed);
+	if (vc->vc_sw->con_invert_region)
+		vc->vc_sw->con_invert_region(vc, p, count);
+#ifndef VT_BUF_VRAM_ONLY
+	else {
+		u16 *q = p;
+		int cnt = count;
+		u16 a;
+
+		if (!vc->vc_can_do_color) {
+			while (cnt--) {
+			    a = scr_readw(q);
+			    a ^= 0x0800;
+			    scr_writew(a, q);
+			    q++;
+			}
+		} else if (vc->vc_hi_font_mask == 0x100) {
+			while (cnt--) {
+				a = scr_readw(q);
+				a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
+				scr_writew(a, q);
+				q++;
+			}
+		} else {
+			while (cnt--) {
+				a = scr_readw(q);
+				a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
+				scr_writew(a, q);
+				q++;
+			}
+		}
+	}
+#endif
+	if (DO_UPDATE(vc))
+		do_update_region(vc, (unsigned long) p, count);
+}
+
+/* used by selection: complement pointer position */
+void complement_pos(struct vc_data *vc, int offset)
+{
+	static int old_offset = -1;
+	static unsigned short old;
+	static unsigned short oldx, oldy;
+
+	WARN_CONSOLE_UNLOCKED();
+
+	if (old_offset != -1 && old_offset >= 0 &&
+	    old_offset < vc->vc_screenbuf_size) {
+		scr_writew(old, screenpos(vc, old_offset, 1));
+		if (DO_UPDATE(vc))
+			vc->vc_sw->con_putc(vc, old, oldy, oldx);
+	}
+
+	old_offset = offset;
+
+	if (offset != -1 && offset >= 0 &&
+	    offset < vc->vc_screenbuf_size) {
+		unsigned short new;
+		unsigned short *p;
+		p = screenpos(vc, offset, 1);
+		old = scr_readw(p);
+		new = old ^ vc->vc_complement_mask;
+		scr_writew(new, p);
+		if (DO_UPDATE(vc)) {
+			oldx = (offset >> 1) % vc->vc_cols;
+			oldy = (offset >> 1) / vc->vc_cols;
+			vc->vc_sw->con_putc(vc, new, oldy, oldx);
+		}
+	}
+
+}
+
+static void insert_char(struct vc_data *vc, unsigned int nr)
+{
+	unsigned short *p, *q = (unsigned short *)vc->vc_pos;
+
+	p = q + vc->vc_cols - nr - vc->vc_x;
+	while (--p >= q)
+		scr_writew(scr_readw(p), p + nr);
+	scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
+	vc->vc_need_wrap = 0;
+	if (DO_UPDATE(vc)) {
+		unsigned short oldattr = vc->vc_attr;
+		vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
+				     vc->vc_cols - vc->vc_x - nr);
+		vc->vc_attr = vc->vc_video_erase_char >> 8;
+		while (nr--)
+			vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
+		vc->vc_attr = oldattr;
+	}
+}
+
+static void delete_char(struct vc_data *vc, unsigned int nr)
+{
+	unsigned int i = vc->vc_x;
+	unsigned short *p = (unsigned short *)vc->vc_pos;
+
+	while (++i <= vc->vc_cols - nr) {
+		scr_writew(scr_readw(p+nr), p);
+		p++;
+	}
+	scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
+	vc->vc_need_wrap = 0;
+	if (DO_UPDATE(vc)) {
+		unsigned short oldattr = vc->vc_attr;
+		vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
+				     vc->vc_cols - vc->vc_x - nr);
+		vc->vc_attr = vc->vc_video_erase_char >> 8;
+		while (nr--)
+			vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
+				     vc->vc_cols - 1 - nr);
+		vc->vc_attr = oldattr;
+	}
+}
+
+static int softcursor_original;
+
+static void add_softcursor(struct vc_data *vc)
+{
+	int i = scr_readw((u16 *) vc->vc_pos);
+	u32 type = vc->vc_cursor_type;
+
+	if (! (type & 0x10)) return;
+	if (softcursor_original != -1) return;
+	softcursor_original = i;
+	i |= ((type >> 8) & 0xff00 );
+	i ^= ((type) & 0xff00 );
+	if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
+	if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
+	scr_writew(i, (u16 *) vc->vc_pos);
+	if (DO_UPDATE(vc))
+		vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
+}
+
+static void hide_softcursor(struct vc_data *vc)
+{
+	if (softcursor_original != -1) {
+		scr_writew(softcursor_original, (u16 *)vc->vc_pos);
+		if (DO_UPDATE(vc))
+			vc->vc_sw->con_putc(vc, softcursor_original,
+					vc->vc_y, vc->vc_x);
+		softcursor_original = -1;
+	}
+}
+
+static void hide_cursor(struct vc_data *vc)
+{
+	if (vc == sel_cons)
+		clear_selection();
+	vc->vc_sw->con_cursor(vc, CM_ERASE);
+	hide_softcursor(vc);
+}
+
+static void set_cursor(struct vc_data *vc)
+{
+	if (!IS_FG(vc) || console_blanked ||
+	    vc->vc_mode == KD_GRAPHICS)
+		return;
+	if (vc->vc_deccm) {
+		if (vc == sel_cons)
+			clear_selection();
+		add_softcursor(vc);
+		if ((vc->vc_cursor_type & 0x0f) != 1)
+			vc->vc_sw->con_cursor(vc, CM_DRAW);
+	} else
+		hide_cursor(vc);
+}
+
+static void set_origin(struct vc_data *vc)
+{
+	WARN_CONSOLE_UNLOCKED();
+
+	if (!CON_IS_VISIBLE(vc) ||
+	    !vc->vc_sw->con_set_origin ||
+	    !vc->vc_sw->con_set_origin(vc))
+		vc->vc_origin = (unsigned long)vc->vc_screenbuf;
+	vc->vc_visible_origin = vc->vc_origin;
+	vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
+	vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
+}
+
+static inline void save_screen(struct vc_data *vc)
+{
+	WARN_CONSOLE_UNLOCKED();
+
+	if (vc->vc_sw->con_save_screen)
+		vc->vc_sw->con_save_screen(vc);
+}
+
+/*
+ *	Redrawing of screen
+ */
+
+static void clear_buffer_attributes(struct vc_data *vc)
+{
+	unsigned short *p = (unsigned short *)vc->vc_origin;
+	int count = vc->vc_screenbuf_size / 2;
+	int mask = vc->vc_hi_font_mask | 0xff;
+
+	for (; count > 0; count--, p++) {
+		scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
+	}
+}
+
+void redraw_screen(struct vc_data *vc, int is_switch)
+{
+	int redraw = 0;
+
+	WARN_CONSOLE_UNLOCKED();
+
+	if (!vc) {
+		/* strange ... */
+		/* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
+		return;
+	}
+
+	if (is_switch) {
+		struct vc_data *old_vc = vc_cons[fg_console].d;
+		if (old_vc == vc)
+			return;
+		if (!CON_IS_VISIBLE(vc))
+			redraw = 1;
+		*vc->vc_display_fg = vc;
+		fg_console = vc->vc_num;
+		hide_cursor(old_vc);
+		if (!CON_IS_VISIBLE(old_vc)) {
+			save_screen(old_vc);
+			set_origin(old_vc);
+		}
+	} else {
+		hide_cursor(vc);
+		redraw = 1;
+	}
+
+	if (redraw) {
+		int update;
+		int old_was_color = vc->vc_can_do_color;
+
+		set_origin(vc);
+		update = vc->vc_sw->con_switch(vc);
+		set_palette(vc);
+		/*
+		 * If console changed from mono<->color, the best we can do
+		 * is to clear the buffer attributes. As it currently stands,
+		 * rebuilding new attributes from the old buffer is not doable
+		 * without overly complex code.
+		 */
+		if (old_was_color != vc->vc_can_do_color) {
+			update_attr(vc);
+			clear_buffer_attributes(vc);
+		}
+
+		/* Forcibly update if we're panicing */
+		if ((update && vc->vc_mode != KD_GRAPHICS) ||
+		    vt_force_oops_output(vc))
+			do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
+	}
+	set_cursor(vc);
+	if (is_switch) {
+		set_leds();
+		compute_shiftstate();
+		notify_update(vc);
+	}
+}
+
+/*
+ *	Allocation, freeing and resizing of VTs.
+ */
+
+int vc_cons_allocated(unsigned int i)
+{
+	return (i < MAX_NR_CONSOLES && vc_cons[i].d);
+}
+
+static void visual_init(struct vc_data *vc, int num, int init)
+{
+	/* ++Geert: vc->vc_sw->con_init determines console size */
+	if (vc->vc_sw)
+		module_put(vc->vc_sw->owner);
+	vc->vc_sw = conswitchp;
+#ifndef VT_SINGLE_DRIVER
+	if (con_driver_map[num])
+		vc->vc_sw = con_driver_map[num];
+#endif
+	__module_get(vc->vc_sw->owner);
+	vc->vc_num = num;
+	vc->vc_display_fg = &master_display_fg;
+	vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
+	vc->vc_uni_pagedir = 0;
+	vc->vc_hi_font_mask = 0;
+	vc->vc_complement_mask = 0;
+	vc->vc_can_do_color = 0;
+	vc->vc_panic_force_write = false;
+	vc->vc_sw->con_init(vc, init);
+	if (!vc->vc_complement_mask)
+		vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
+	vc->vc_s_complement_mask = vc->vc_complement_mask;
+	vc->vc_size_row = vc->vc_cols << 1;
+	vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
+}
+
+int vc_allocate(unsigned int currcons)	/* return 0 on success */
+{
+	WARN_CONSOLE_UNLOCKED();
+
+	if (currcons >= MAX_NR_CONSOLES)
+		return -ENXIO;
+	if (!vc_cons[currcons].d) {
+	    struct vc_data *vc;
+	    struct vt_notifier_param param;
+
+	    /* prevent users from taking too much memory */
+	    if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
+	      return -EPERM;
+
+	    /* due to the granularity of kmalloc, we waste some memory here */
+	    /* the alloc is done in two steps, to optimize the common situation
+	       of a 25x80 console (structsize=216, screenbuf_size=4000) */
+	    /* although the numbers above are not valid since long ago, the
+	       point is still up-to-date and the comment still has its value
+	       even if only as a historical artifact.  --mj, July 1998 */
+	    param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
+	    if (!vc)
+		return -ENOMEM;
+	    vc_cons[currcons].d = vc;
+	    tty_port_init(&vc->port);
+	    INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+	    visual_init(vc, currcons, 1);
+	    if (!*vc->vc_uni_pagedir_loc)
+		con_set_default_unimap(vc);
+	    vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
+	    if (!vc->vc_screenbuf) {
+		kfree(vc);
+		vc_cons[currcons].d = NULL;
+		return -ENOMEM;
+	    }
+
+	    /* If no drivers have overridden us and the user didn't pass a
+	       boot option, default to displaying the cursor */
+	    if (global_cursor_default == -1)
+		    global_cursor_default = 1;
+
+	    vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
+	    vcs_make_sysfs(currcons);
+	    atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
+	}
+	return 0;
+}
+
+static inline int resize_screen(struct vc_data *vc, int width, int height,
+				int user)
+{
+	/* Resizes the resolution of the display adapater */
+	int err = 0;
+
+	if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
+		err = vc->vc_sw->con_resize(vc, width, height, user);
+
+	return err;
+}
+
+/*
+ * Change # of rows and columns (0 means unchanged/the size of fg_console)
+ * [this is to be used together with some user program
+ * like resize that changes the hardware videomode]
+ */
+#define VC_RESIZE_MAXCOL (32767)
+#define VC_RESIZE_MAXROW (32767)
+
+/**
+ *	vc_do_resize	-	resizing method for the tty
+ *	@tty: tty being resized
+ *	@real_tty: real tty (different to tty if a pty/tty pair)
+ *	@vc: virtual console private data
+ *	@cols: columns
+ *	@lines: lines
+ *
+ *	Resize a virtual console, clipping according to the actual constraints.
+ *	If the caller passes a tty structure then update the termios winsize
+ *	information and perform any necessary signal handling.
+ *
+ *	Caller must hold the console semaphore. Takes the termios mutex and
+ *	ctrl_lock of the tty IFF a tty is passed.
+ */
+
+static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
+				unsigned int cols, unsigned int lines)
+{
+	unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
+	unsigned long end;
+	unsigned int old_cols, old_rows, old_row_size, old_screen_size;
+	unsigned int new_cols, new_rows, new_row_size, new_screen_size;
+	unsigned int user;
+	unsigned short *newscreen;
+
+	WARN_CONSOLE_UNLOCKED();
+
+	if (!vc)
+		return -ENXIO;
+
+	user = vc->vc_resize_user;
+	vc->vc_resize_user = 0;
+
+	if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
+		return -EINVAL;
+
+	new_cols = (cols ? cols : vc->vc_cols);
+	new_rows = (lines ? lines : vc->vc_rows);
+	new_row_size = new_cols << 1;
+	new_screen_size = new_row_size * new_rows;
+
+	if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
+		return 0;
+
+	newscreen = kmalloc(new_screen_size, GFP_USER);
+	if (!newscreen)
+		return -ENOMEM;
+
+	old_rows = vc->vc_rows;
+	old_cols = vc->vc_cols;
+	old_row_size = vc->vc_size_row;
+	old_screen_size = vc->vc_screenbuf_size;
+
+	err = resize_screen(vc, new_cols, new_rows, user);
+	if (err) {
+		kfree(newscreen);
+		return err;
+	}
+
+	vc->vc_rows = new_rows;
+	vc->vc_cols = new_cols;
+	vc->vc_size_row = new_row_size;
+	vc->vc_screenbuf_size = new_screen_size;
+
+	rlth = min(old_row_size, new_row_size);
+	rrem = new_row_size - rlth;
+	old_origin = vc->vc_origin;
+	new_origin = (long) newscreen;
+	new_scr_end = new_origin + new_screen_size;
+
+	if (vc->vc_y > new_rows) {
+		if (old_rows - vc->vc_y < new_rows) {
+			/*
+			 * Cursor near the bottom, copy contents from the
+			 * bottom of buffer
+			 */
+			old_origin += (old_rows - new_rows) * old_row_size;
+		} else {
+			/*
+			 * Cursor is in no man's land, copy 1/2 screenful
+			 * from the top and bottom of cursor position
+			 */
+			old_origin += (vc->vc_y - new_rows/2) * old_row_size;
+		}
+	}
+
+	end = old_origin + old_row_size * min(old_rows, new_rows);
+
+	update_attr(vc);
+
+	while (old_origin < end) {
+		scr_memcpyw((unsigned short *) new_origin,
+			    (unsigned short *) old_origin, rlth);
+		if (rrem)
+			scr_memsetw((void *)(new_origin + rlth),
+				    vc->vc_video_erase_char, rrem);
+		old_origin += old_row_size;
+		new_origin += new_row_size;
+	}
+	if (new_scr_end > new_origin)
+		scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
+			    new_scr_end - new_origin);
+	kfree(vc->vc_screenbuf);
+	vc->vc_screenbuf = newscreen;
+	vc->vc_screenbuf_size = new_screen_size;
+	set_origin(vc);
+
+	/* do part of a reset_terminal() */
+	vc->vc_top = 0;
+	vc->vc_bottom = vc->vc_rows;
+	gotoxy(vc, vc->vc_x, vc->vc_y);
+	save_cur(vc);
+
+	if (tty) {
+		/* Rewrite the requested winsize data with the actual
+		   resulting sizes */
+		struct winsize ws;
+		memset(&ws, 0, sizeof(ws));
+		ws.ws_row = vc->vc_rows;
+		ws.ws_col = vc->vc_cols;
+		ws.ws_ypixel = vc->vc_scan_lines;
+		tty_do_resize(tty, &ws);
+	}
+
+	if (CON_IS_VISIBLE(vc))
+		update_screen(vc);
+	vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
+	return err;
+}
+
+/**
+ *	vc_resize		-	resize a VT
+ *	@vc: virtual console
+ *	@cols: columns
+ *	@rows: rows
+ *
+ *	Resize a virtual console as seen from the console end of things. We
+ *	use the common vc_do_resize methods to update the structures. The
+ *	caller must hold the console sem to protect console internals and
+ *	vc->port.tty
+ */
+
+int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
+{
+	return vc_do_resize(vc->port.tty, vc, cols, rows);
+}
+
+/**
+ *	vt_resize		-	resize a VT
+ *	@tty: tty to resize
+ *	@ws: winsize attributes
+ *
+ *	Resize a virtual terminal. This is called by the tty layer as we
+ *	register our own handler for resizing. The mutual helper does all
+ *	the actual work.
+ *
+ *	Takes the console sem and the called methods then take the tty
+ *	termios_mutex and the tty ctrl_lock in that order.
+ */
+static int vt_resize(struct tty_struct *tty, struct winsize *ws)
+{
+	struct vc_data *vc = tty->driver_data;
+	int ret;
+
+	acquire_console_sem();
+	ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
+	release_console_sem();
+	return ret;
+}
+
+void vc_deallocate(unsigned int currcons)
+{
+	WARN_CONSOLE_UNLOCKED();
+
+	if (vc_cons_allocated(currcons)) {
+		struct vc_data *vc = vc_cons[currcons].d;
+		struct vt_notifier_param param = { .vc = vc };
+
+		atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
+		vcs_remove_sysfs(currcons);
+		vc->vc_sw->con_deinit(vc);
+		put_pid(vc->vt_pid);
+		module_put(vc->vc_sw->owner);
+		kfree(vc->vc_screenbuf);
+		if (currcons >= MIN_NR_CONSOLES)
+			kfree(vc);
+		vc_cons[currcons].d = NULL;
+	}
+}
+
+/*
+ *	VT102 emulator
+ */
+
+#define set_kbd(vc, x)	set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
+#define clr_kbd(vc, x)	clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
+#define is_kbd(vc, x)	vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
+
+#define decarm		VC_REPEAT
+#define decckm		VC_CKMODE
+#define kbdapplic	VC_APPLIC
+#define lnm		VC_CRLF
+
+/*
+ * this is what the terminal answers to a ESC-Z or csi0c query.
+ */
+#define VT100ID "\033[?1;2c"
+#define VT102ID "\033[?6c"
+
+unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
+				       8,12,10,14, 9,13,11,15 };
+
+/* the default colour table, for VGA+ colour systems */
+int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
+    0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
+int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
+    0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
+int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
+    0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
+
+module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
+module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
+module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
+
+/*
+ * gotoxy() must verify all boundaries, because the arguments
+ * might also be negative. If the given position is out of
+ * bounds, the cursor is placed at the nearest margin.
+ */
+static void gotoxy(struct vc_data *vc, int new_x, int new_y)
+{
+	int min_y, max_y;
+
+	if (new_x < 0)
+		vc->vc_x = 0;
+	else {
+		if (new_x >= vc->vc_cols)
+			vc->vc_x = vc->vc_cols - 1;
+		else
+			vc->vc_x = new_x;
+	}
+
+ 	if (vc->vc_decom) {
+		min_y = vc->vc_top;
+		max_y = vc->vc_bottom;
+	} else {
+		min_y = 0;
+		max_y = vc->vc_rows;
+	}
+	if (new_y < min_y)
+		vc->vc_y = min_y;
+	else if (new_y >= max_y)
+		vc->vc_y = max_y - 1;
+	else
+		vc->vc_y = new_y;
+	vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
+	vc->vc_need_wrap = 0;
+}
+
+/* for absolute user moves, when decom is set */
+static void gotoxay(struct vc_data *vc, int new_x, int new_y)
+{
+	gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
+}
+
+void scrollback(struct vc_data *vc, int lines)
+{
+	if (!lines)
+		lines = vc->vc_rows / 2;
+	scrolldelta(-lines);
+}
+
+void scrollfront(struct vc_data *vc, int lines)
+{
+	if (!lines)
+		lines = vc->vc_rows / 2;
+	scrolldelta(lines);
+}
+
+static void lf(struct vc_data *vc)
+{
+    	/* don't scroll if above bottom of scrolling region, or
+	 * if below scrolling region
+	 */
+    	if (vc->vc_y + 1 == vc->vc_bottom)
+		scrup(vc, vc->vc_top, vc->vc_bottom, 1);
+	else if (vc->vc_y < vc->vc_rows - 1) {
+	    	vc->vc_y++;
+		vc->vc_pos += vc->vc_size_row;
+	}
+	vc->vc_need_wrap = 0;
+	notify_write(vc, '\n');
+}
+
+static void ri(struct vc_data *vc)
+{
+    	/* don't scroll if below top of scrolling region, or
+	 * if above scrolling region
+	 */
+	if (vc->vc_y == vc->vc_top)
+		scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
+	else if (vc->vc_y > 0) {
+		vc->vc_y--;
+		vc->vc_pos -= vc->vc_size_row;
+	}
+	vc->vc_need_wrap = 0;
+}
+
+static inline void cr(struct vc_data *vc)
+{
+	vc->vc_pos -= vc->vc_x << 1;
+	vc->vc_need_wrap = vc->vc_x = 0;
+	notify_write(vc, '\r');
+}
+
+static inline void bs(struct vc_data *vc)
+{
+	if (vc->vc_x) {
+		vc->vc_pos -= 2;
+		vc->vc_x--;
+		vc->vc_need_wrap = 0;
+		notify_write(vc, '\b');
+	}
+}
+
+static inline void del(struct vc_data *vc)
+{
+	/* ignored */
+}
+
+static void csi_J(struct vc_data *vc, int vpar)
+{
+	unsigned int count;
+	unsigned short * start;
+
+	switch (vpar) {
+		case 0:	/* erase from cursor to end of display */
+			count = (vc->vc_scr_end - vc->vc_pos) >> 1;
+			start = (unsigned short *)vc->vc_pos;
+			if (DO_UPDATE(vc)) {
+				/* do in two stages */
+				vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
+					      vc->vc_cols - vc->vc_x);
+				vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
+					      vc->vc_rows - vc->vc_y - 1,
+					      vc->vc_cols);
+			}
+			break;
+		case 1:	/* erase from start to cursor */
+			count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
+			start = (unsigned short *)vc->vc_origin;
+			if (DO_UPDATE(vc)) {
+				/* do in two stages */
+				vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
+					      vc->vc_cols);
+				vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
+					      vc->vc_x + 1);
+			}
+			break;
+		case 2: /* erase whole display */
+			count = vc->vc_cols * vc->vc_rows;
+			start = (unsigned short *)vc->vc_origin;
+			if (DO_UPDATE(vc))
+				vc->vc_sw->con_clear(vc, 0, 0,
+					      vc->vc_rows,
+					      vc->vc_cols);
+			break;
+		default:
+			return;
+	}
+	scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
+	vc->vc_need_wrap = 0;
+}
+
+static void csi_K(struct vc_data *vc, int vpar)
+{
+	unsigned int count;
+	unsigned short * start;
+
+	switch (vpar) {
+		case 0:	/* erase from cursor to end of line */
+			count = vc->vc_cols - vc->vc_x;
+			start = (unsigned short *)vc->vc_pos;
+			if (DO_UPDATE(vc))
+				vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
+						     vc->vc_cols - vc->vc_x);
+			break;
+		case 1:	/* erase from start of line to cursor */
+			start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
+			count = vc->vc_x + 1;
+			if (DO_UPDATE(vc))
+				vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
+						     vc->vc_x + 1);
+			break;
+		case 2: /* erase whole line */
+			start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
+			count = vc->vc_cols;
+			if (DO_UPDATE(vc))
+				vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
+					      vc->vc_cols);
+			break;
+		default:
+			return;
+	}
+	scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
+	vc->vc_need_wrap = 0;
+}
+
+static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
+{					  /* not vt100? */
+	int count;
+
+	if (!vpar)
+		vpar++;
+	count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
+
+	scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
+	if (DO_UPDATE(vc))
+		vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
+	vc->vc_need_wrap = 0;
+}
+
+static void default_attr(struct vc_data *vc)
+{
+	vc->vc_intensity = 1;
+	vc->vc_italic = 0;
+	vc->vc_underline = 0;
+	vc->vc_reverse = 0;
+	vc->vc_blink = 0;
+	vc->vc_color = vc->vc_def_color;
+}
+
+/* console_sem is held */
+static void csi_m(struct vc_data *vc)
+{
+	int i;
+
+	for (i = 0; i <= vc->vc_npar; i++)
+		switch (vc->vc_par[i]) {
+			case 0:	/* all attributes off */
+				default_attr(vc);
+				break;
+			case 1:
+				vc->vc_intensity = 2;
+				break;
+			case 2:
+				vc->vc_intensity = 0;
+				break;
+			case 3:
+				vc->vc_italic = 1;
+				break;
+			case 4:
+				vc->vc_underline = 1;
+				break;
+			case 5:
+				vc->vc_blink = 1;
+				break;
+			case 7:
+				vc->vc_reverse = 1;
+				break;
+			case 10: /* ANSI X3.64-1979 (SCO-ish?)
+				  * Select primary font, don't display
+				  * control chars if defined, don't set
+				  * bit 8 on output.
+				  */
+				vc->vc_translate = set_translate(vc->vc_charset == 0
+						? vc->vc_G0_charset
+						: vc->vc_G1_charset, vc);
+				vc->vc_disp_ctrl = 0;
+				vc->vc_toggle_meta = 0;
+				break;
+			case 11: /* ANSI X3.64-1979 (SCO-ish?)
+				  * Select first alternate font, lets
+				  * chars < 32 be displayed as ROM chars.
+				  */
+				vc->vc_translate = set_translate(IBMPC_MAP, vc);
+				vc->vc_disp_ctrl = 1;
+				vc->vc_toggle_meta = 0;
+				break;
+			case 12: /* ANSI X3.64-1979 (SCO-ish?)
+				  * Select second alternate font, toggle
+				  * high bit before displaying as ROM char.
+				  */
+				vc->vc_translate = set_translate(IBMPC_MAP, vc);
+				vc->vc_disp_ctrl = 1;
+				vc->vc_toggle_meta = 1;
+				break;
+			case 21:
+			case 22:
+				vc->vc_intensity = 1;
+				break;
+			case 23:
+				vc->vc_italic = 0;
+				break;
+			case 24:
+				vc->vc_underline = 0;
+				break;
+			case 25:
+				vc->vc_blink = 0;
+				break;
+			case 27:
+				vc->vc_reverse = 0;
+				break;
+			case 38: /* ANSI X3.64-1979 (SCO-ish?)
+				  * Enables underscore, white foreground
+				  * with white underscore (Linux - use
+				  * default foreground).
+				  */
+				vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
+				vc->vc_underline = 1;
+				break;
+			case 39: /* ANSI X3.64-1979 (SCO-ish?)
+				  * Disable underline option.
+				  * Reset colour to default? It did this
+				  * before...
+				  */
+				vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
+				vc->vc_underline = 0;
+				break;
+			case 49:
+				vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
+				break;
+			default:
+				if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
+					vc->vc_color = color_table[vc->vc_par[i] - 30]
+						| (vc->vc_color & 0xf0);
+				else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
+					vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
+						| (vc->vc_color & 0x0f);
+				break;
+		}
+	update_attr(vc);
+}
+
+static void respond_string(const char *p, struct tty_struct *tty)
+{
+	while (*p) {
+		tty_insert_flip_char(tty, *p, 0);
+		p++;
+	}
+	con_schedule_flip(tty);
+}
+
+static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
+{
+	char buf[40];
+
+	sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
+	respond_string(buf, tty);
+}
+
+static inline void status_report(struct tty_struct *tty)
+{
+	respond_string("\033[0n", tty);	/* Terminal ok */
+}
+
+static inline void respond_ID(struct tty_struct * tty)
+{
+	respond_string(VT102ID, tty);
+}
+
+void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
+{
+	char buf[8];
+
+	sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
+		(char)('!' + mry));
+	respond_string(buf, tty);
+}
+
+/* invoked via ioctl(TIOCLINUX) and through set_selection */
+int mouse_reporting(void)
+{
+	return vc_cons[fg_console].d->vc_report_mouse;
+}
+
+/* console_sem is held */
+static void set_mode(struct vc_data *vc, int on_off)
+{
+	int i;
+
+	for (i = 0; i <= vc->vc_npar; i++)
+		if (vc->vc_ques) {
+			switch(vc->vc_par[i]) {	/* DEC private modes set/reset */
+			case 1:			/* Cursor keys send ^[Ox/^[[x */
+				if (on_off)
+					set_kbd(vc, decckm);
+				else
+					clr_kbd(vc, decckm);
+				break;
+			case 3:	/* 80/132 mode switch unimplemented */
+				vc->vc_deccolm = on_off;
+#if 0
+				vc_resize(deccolm ? 132 : 80, vc->vc_rows);
+				/* this alone does not suffice; some user mode
+				   utility has to change the hardware regs */
+#endif
+				break;
+			case 5:			/* Inverted screen on/off */
+				if (vc->vc_decscnm != on_off) {
+					vc->vc_decscnm = on_off;
+					invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
+					update_attr(vc);
+				}
+				break;
+			case 6:			/* Origin relative/absolute */
+				vc->vc_decom = on_off;
+				gotoxay(vc, 0, 0);
+				break;
+			case 7:			/* Autowrap on/off */
+				vc->vc_decawm = on_off;
+				break;
+			case 8:			/* Autorepeat on/off */
+				if (on_off)
+					set_kbd(vc, decarm);
+				else
+					clr_kbd(vc, decarm);
+				break;
+			case 9:
+				vc->vc_report_mouse = on_off ? 1 : 0;
+				break;
+			case 25:		/* Cursor on/off */
+				vc->vc_deccm = on_off;
+				break;
+			case 1000:
+				vc->vc_report_mouse = on_off ? 2 : 0;
+				break;
+			}
+		} else {
+			switch(vc->vc_par[i]) {	/* ANSI modes set/reset */
+			case 3:			/* Monitor (display ctrls) */
+				vc->vc_disp_ctrl = on_off;
+				break;
+			case 4:			/* Insert Mode on/off */
+				vc->vc_decim = on_off;
+				break;
+			case 20:		/* Lf, Enter == CrLf/Lf */
+				if (on_off)
+					set_kbd(vc, lnm);
+				else
+					clr_kbd(vc, lnm);
+				break;
+			}
+		}
+}
+
+/* console_sem is held */
+static void setterm_command(struct vc_data *vc)
+{
+	switch(vc->vc_par[0]) {
+		case 1:	/* set color for underline mode */
+			if (vc->vc_can_do_color &&
+					vc->vc_par[1] < 16) {
+				vc->vc_ulcolor = color_table[vc->vc_par[1]];
+				if (vc->vc_underline)
+					update_attr(vc);
+			}
+			break;
+		case 2:	/* set color for half intensity mode */
+			if (vc->vc_can_do_color &&
+					vc->vc_par[1] < 16) {
+				vc->vc_halfcolor = color_table[vc->vc_par[1]];
+				if (vc->vc_intensity == 0)
+					update_attr(vc);
+			}
+			break;
+		case 8:	/* store colors as defaults */
+			vc->vc_def_color = vc->vc_attr;
+			if (vc->vc_hi_font_mask == 0x100)
+				vc->vc_def_color >>= 1;
+			default_attr(vc);
+			update_attr(vc);
+			break;
+		case 9:	/* set blanking interval */
+			blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
+			poke_blanked_console();
+			break;
+		case 10: /* set bell frequency in Hz */
+			if (vc->vc_npar >= 1)
+				vc->vc_bell_pitch = vc->vc_par[1];
+			else
+				vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
+			break;
+		case 11: /* set bell duration in msec */
+			if (vc->vc_npar >= 1)
+				vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
+					vc->vc_par[1] * HZ / 1000 : 0;
+			else
+				vc->vc_bell_duration = DEFAULT_BELL_DURATION;
+			break;
+		case 12: /* bring specified console to the front */
+			if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
+				set_console(vc->vc_par[1] - 1);
+			break;
+		case 13: /* unblank the screen */
+			poke_blanked_console();
+			break;
+		case 14: /* set vesa powerdown interval */
+			vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
+			break;
+		case 15: /* activate the previous console */
+			set_console(last_console);
+			break;
+	}
+}
+
+/* console_sem is held */
+static void csi_at(struct vc_data *vc, unsigned int nr)
+{
+	if (nr > vc->vc_cols - vc->vc_x)
+		nr = vc->vc_cols - vc->vc_x;
+	else if (!nr)
+		nr = 1;
+	insert_char(vc, nr);
+}
+
+/* console_sem is held */
+static void csi_L(struct vc_data *vc, unsigned int nr)
+{
+	if (nr > vc->vc_rows - vc->vc_y)
+		nr = vc->vc_rows - vc->vc_y;
+	else if (!nr)
+		nr = 1;
+	scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
+	vc->vc_need_wrap = 0;
+}
+
+/* console_sem is held */
+static void csi_P(struct vc_data *vc, unsigned int nr)
+{
+	if (nr > vc->vc_cols - vc->vc_x)
+		nr = vc->vc_cols - vc->vc_x;
+	else if (!nr)
+		nr = 1;
+	delete_char(vc, nr);
+}
+
+/* console_sem is held */
+static void csi_M(struct vc_data *vc, unsigned int nr)
+{
+	if (nr > vc->vc_rows - vc->vc_y)
+		nr = vc->vc_rows - vc->vc_y;
+	else if (!nr)
+		nr=1;
+	scrup(vc, vc->vc_y, vc->vc_bottom, nr);
+	vc->vc_need_wrap = 0;
+}
+
+/* console_sem is held (except via vc_init->reset_terminal */
+static void save_cur(struct vc_data *vc)
+{
+	vc->vc_saved_x		= vc->vc_x;
+	vc->vc_saved_y		= vc->vc_y;
+	vc->vc_s_intensity	= vc->vc_intensity;
+	vc->vc_s_italic         = vc->vc_italic;
+	vc->vc_s_underline	= vc->vc_underline;
+	vc->vc_s_blink		= vc->vc_blink;
+	vc->vc_s_reverse	= vc->vc_reverse;
+	vc->vc_s_charset	= vc->vc_charset;
+	vc->vc_s_color		= vc->vc_color;
+	vc->vc_saved_G0		= vc->vc_G0_charset;
+	vc->vc_saved_G1		= vc->vc_G1_charset;
+}
+
+/* console_sem is held */
+static void restore_cur(struct vc_data *vc)
+{
+	gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
+	vc->vc_intensity	= vc->vc_s_intensity;
+	vc->vc_italic		= vc->vc_s_italic;
+	vc->vc_underline	= vc->vc_s_underline;
+	vc->vc_blink		= vc->vc_s_blink;
+	vc->vc_reverse		= vc->vc_s_reverse;
+	vc->vc_charset		= vc->vc_s_charset;
+	vc->vc_color		= vc->vc_s_color;
+	vc->vc_G0_charset	= vc->vc_saved_G0;
+	vc->vc_G1_charset	= vc->vc_saved_G1;
+	vc->vc_translate	= set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
+	update_attr(vc);
+	vc->vc_need_wrap = 0;
+}
+
+enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
+	EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
+	ESpalette };
+
+/* console_sem is held (except via vc_init()) */
+static void reset_terminal(struct vc_data *vc, int do_clear)
+{
+	vc->vc_top		= 0;
+	vc->vc_bottom		= vc->vc_rows;
+	vc->vc_state		= ESnormal;
+	vc->vc_ques		= 0;
+	vc->vc_translate	= set_translate(LAT1_MAP, vc);
+	vc->vc_G0_charset	= LAT1_MAP;
+	vc->vc_G1_charset	= GRAF_MAP;
+	vc->vc_charset		= 0;
+	vc->vc_need_wrap	= 0;
+	vc->vc_report_mouse	= 0;
+	vc->vc_utf              = default_utf8;
+	vc->vc_utf_count	= 0;
+
+	vc->vc_disp_ctrl	= 0;
+	vc->vc_toggle_meta	= 0;
+
+	vc->vc_decscnm		= 0;
+	vc->vc_decom		= 0;
+	vc->vc_decawm		= 1;
+	vc->vc_deccm		= global_cursor_default;
+	vc->vc_decim		= 0;
+
+	set_kbd(vc, decarm);
+	clr_kbd(vc, decckm);
+	clr_kbd(vc, kbdapplic);
+	clr_kbd(vc, lnm);
+	kbd_table[vc->vc_num].lockstate = 0;
+	kbd_table[vc->vc_num].slockstate = 0;
+	kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
+	kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
+	/* do not do set_leds here because this causes an endless tasklet loop
+	   when the keyboard hasn't been initialized yet */
+
+	vc->vc_cursor_type = cur_default;
+	vc->vc_complement_mask = vc->vc_s_complement_mask;
+
+	default_attr(vc);
+	update_attr(vc);
+
+	vc->vc_tab_stop[0]	= 0x01010100;
+	vc->vc_tab_stop[1]	=
+	vc->vc_tab_stop[2]	=
+	vc->vc_tab_stop[3]	=
+	vc->vc_tab_stop[4]	=
+	vc->vc_tab_stop[5]	=
+	vc->vc_tab_stop[6]	=
+	vc->vc_tab_stop[7]	= 0x01010101;
+
+	vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
+	vc->vc_bell_duration = DEFAULT_BELL_DURATION;
+
+	gotoxy(vc, 0, 0);
+	save_cur(vc);
+	if (do_clear)
+	    csi_J(vc, 2);
+}
+
+/* console_sem is held */
+static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
+{
+	/*
+	 *  Control characters can be used in the _middle_
+	 *  of an escape sequence.
+	 */
+	switch (c) {
+	case 0:
+		return;
+	case 7:
+		if (vc->vc_bell_duration)
+			kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
+		return;
+	case 8:
+		bs(vc);
+		return;
+	case 9:
+		vc->vc_pos -= (vc->vc_x << 1);
+		while (vc->vc_x < vc->vc_cols - 1) {
+			vc->vc_x++;
+			if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
+				break;
+		}
+		vc->vc_pos += (vc->vc_x << 1);
+		notify_write(vc, '\t');
+		return;
+	case 10: case 11: case 12:
+		lf(vc);
+		if (!is_kbd(vc, lnm))
+			return;
+	case 13:
+		cr(vc);
+		return;
+	case 14:
+		vc->vc_charset = 1;
+		vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
+		vc->vc_disp_ctrl = 1;
+		return;
+	case 15:
+		vc->vc_charset = 0;
+		vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
+		vc->vc_disp_ctrl = 0;
+		return;
+	case 24: case 26:
+		vc->vc_state = ESnormal;
+		return;
+	case 27:
+		vc->vc_state = ESesc;
+		return;
+	case 127:
+		del(vc);
+		return;
+	case 128+27:
+		vc->vc_state = ESsquare;
+		return;
+	}
+	switch(vc->vc_state) {
+	case ESesc:
+		vc->vc_state = ESnormal;
+		switch (c) {
+		case '[':
+			vc->vc_state = ESsquare;
+			return;
+		case ']':
+			vc->vc_state = ESnonstd;
+			return;
+		case '%':
+			vc->vc_state = ESpercent;
+			return;
+		case 'E':
+			cr(vc);
+			lf(vc);
+			return;
+		case 'M':
+			ri(vc);
+			return;
+		case 'D':
+			lf(vc);
+			return;
+		case 'H':
+			vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
+			return;
+		case 'Z':
+			respond_ID(tty);
+			return;
+		case '7':
+			save_cur(vc);
+			return;
+		case '8':
+			restore_cur(vc);
+			return;
+		case '(':
+			vc->vc_state = ESsetG0;
+			return;
+		case ')':
+			vc->vc_state = ESsetG1;
+			return;
+		case '#':
+			vc->vc_state = EShash;
+			return;
+		case 'c':
+			reset_terminal(vc, 1);
+			return;
+		case '>':  /* Numeric keypad */
+			clr_kbd(vc, kbdapplic);
+			return;
+		case '=':  /* Appl. keypad */
+			set_kbd(vc, kbdapplic);
+			return;
+		}
+		return;
+	case ESnonstd:
+		if (c=='P') {   /* palette escape sequence */
+			for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
+				vc->vc_par[vc->vc_npar] = 0;
+			vc->vc_npar = 0;
+			vc->vc_state = ESpalette;
+			return;
+		} else if (c=='R') {   /* reset palette */
+			reset_palette(vc);
+			vc->vc_state = ESnormal;
+		} else
+			vc->vc_state = ESnormal;
+		return;
+	case ESpalette:
+		if (isxdigit(c)) {
+			vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
+			if (vc->vc_npar == 7) {
+				int i = vc->vc_par[0] * 3, j = 1;
+				vc->vc_palette[i] = 16 * vc->vc_par[j++];
+				vc->vc_palette[i++] += vc->vc_par[j++];
+				vc->vc_palette[i] = 16 * vc->vc_par[j++];
+				vc->vc_palette[i++] += vc->vc_par[j++];
+				vc->vc_palette[i] = 16 * vc->vc_par[j++];
+				vc->vc_palette[i] += vc->vc_par[j];
+				set_palette(vc);
+				vc->vc_state = ESnormal;
+			}
+		} else
+			vc->vc_state = ESnormal;
+		return;
+	case ESsquare:
+		for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
+			vc->vc_par[vc->vc_npar] = 0;
+		vc->vc_npar = 0;
+		vc->vc_state = ESgetpars;
+		if (c == '[') { /* Function key */
+			vc->vc_state=ESfunckey;
+			return;
+		}
+		vc->vc_ques = (c == '?');
+		if (vc->vc_ques)
+			return;
+	case ESgetpars:
+		if (c == ';' && vc->vc_npar < NPAR - 1) {
+			vc->vc_npar++;
+			return;
+		} else if (c>='0' && c<='9') {
+			vc->vc_par[vc->vc_npar] *= 10;
+			vc->vc_par[vc->vc_npar] += c - '0';
+			return;
+		} else
+			vc->vc_state = ESgotpars;
+	case ESgotpars:
+		vc->vc_state = ESnormal;
+		switch(c) {
+		case 'h':
+			set_mode(vc, 1);
+			return;
+		case 'l':
+			set_mode(vc, 0);
+			return;
+		case 'c':
+			if (vc->vc_ques) {
+				if (vc->vc_par[0])
+					vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
+				else
+					vc->vc_cursor_type = cur_default;
+				return;
+			}
+			break;
+		case 'm':
+			if (vc->vc_ques) {
+				clear_selection();
+				if (vc->vc_par[0])
+					vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
+				else
+					vc->vc_complement_mask = vc->vc_s_complement_mask;
+				return;
+			}
+			break;
+		case 'n':
+			if (!vc->vc_ques) {
+				if (vc->vc_par[0] == 5)
+					status_report(tty);
+				else if (vc->vc_par[0] == 6)
+					cursor_report(vc, tty);
+			}
+			return;
+		}
+		if (vc->vc_ques) {
+			vc->vc_ques = 0;
+			return;
+		}
+		switch(c) {
+		case 'G': case '`':
+			if (vc->vc_par[0])
+				vc->vc_par[0]--;
+			gotoxy(vc, vc->vc_par[0], vc->vc_y);
+			return;
+		case 'A':
+			if (!vc->vc_par[0])
+				vc->vc_par[0]++;
+			gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
+			return;
+		case 'B': case 'e':
+			if (!vc->vc_par[0])
+				vc->vc_par[0]++;
+			gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
+			return;
+		case 'C': case 'a':
+			if (!vc->vc_par[0])
+				vc->vc_par[0]++;
+			gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
+			return;
+		case 'D':
+			if (!vc->vc_par[0])
+				vc->vc_par[0]++;
+			gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
+			return;
+		case 'E':
+			if (!vc->vc_par[0])
+				vc->vc_par[0]++;
+			gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
+			return;
+		case 'F':
+			if (!vc->vc_par[0])
+				vc->vc_par[0]++;
+			gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
+			return;
+		case 'd':
+			if (vc->vc_par[0])
+				vc->vc_par[0]--;
+			gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
+			return;
+		case 'H': case 'f':
+			if (vc->vc_par[0])
+				vc->vc_par[0]--;
+			if (vc->vc_par[1])
+				vc->vc_par[1]--;
+			gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
+			return;
+		case 'J':
+			csi_J(vc, vc->vc_par[0]);
+			return;
+		case 'K':
+			csi_K(vc, vc->vc_par[0]);
+			return;
+		case 'L':
+			csi_L(vc, vc->vc_par[0]);
+			return;
+		case 'M':
+			csi_M(vc, vc->vc_par[0]);
+			return;
+		case 'P':
+			csi_P(vc, vc->vc_par[0]);
+			return;
+		case 'c':
+			if (!vc->vc_par[0])
+				respond_ID(tty);
+			return;
+		case 'g':
+			if (!vc->vc_par[0])
+				vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
+			else if (vc->vc_par[0] == 3) {
+				vc->vc_tab_stop[0] =
+					vc->vc_tab_stop[1] =
+					vc->vc_tab_stop[2] =
+					vc->vc_tab_stop[3] =
+					vc->vc_tab_stop[4] =
+					vc->vc_tab_stop[5] =
+					vc->vc_tab_stop[6] =
+					vc->vc_tab_stop[7] = 0;
+			}
+			return;
+		case 'm':
+			csi_m(vc);
+			return;
+		case 'q': /* DECLL - but only 3 leds */
+			/* map 0,1,2,3 to 0,1,2,4 */
+			if (vc->vc_par[0] < 4)
+				setledstate(kbd_table + vc->vc_num,
+					    (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
+			return;
+		case 'r':
+			if (!vc->vc_par[0])
+				vc->vc_par[0]++;
+			if (!vc->vc_par[1])
+				vc->vc_par[1] = vc->vc_rows;
+			/* Minimum allowed region is 2 lines */
+			if (vc->vc_par[0] < vc->vc_par[1] &&
+			    vc->vc_par[1] <= vc->vc_rows) {
+				vc->vc_top = vc->vc_par[0] - 1;
+				vc->vc_bottom = vc->vc_par[1];
+				gotoxay(vc, 0, 0);
+			}
+			return;
+		case 's':
+			save_cur(vc);
+			return;
+		case 'u':
+			restore_cur(vc);
+			return;
+		case 'X':
+			csi_X(vc, vc->vc_par[0]);
+			return;
+		case '@':
+			csi_at(vc, vc->vc_par[0]);
+			return;
+		case ']': /* setterm functions */
+			setterm_command(vc);
+			return;
+		}
+		return;
+	case ESpercent:
+		vc->vc_state = ESnormal;
+		switch (c) {
+		case '@':  /* defined in ISO 2022 */
+			vc->vc_utf = 0;
+			return;
+		case 'G':  /* prelim official escape code */
+		case '8':  /* retained for compatibility */
+			vc->vc_utf = 1;
+			return;
+		}
+		return;
+	case ESfunckey:
+		vc->vc_state = ESnormal;
+		return;
+	case EShash:
+		vc->vc_state = ESnormal;
+		if (c == '8') {
+			/* DEC screen alignment test. kludge :-) */
+			vc->vc_video_erase_char =
+				(vc->vc_video_erase_char & 0xff00) | 'E';
+			csi_J(vc, 2);
+			vc->vc_video_erase_char =
+				(vc->vc_video_erase_char & 0xff00) | ' ';
+			do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
+		}
+		return;
+	case ESsetG0:
+		if (c == '0')
+			vc->vc_G0_charset = GRAF_MAP;
+		else if (c == 'B')
+			vc->vc_G0_charset = LAT1_MAP;
+		else if (c == 'U')
+			vc->vc_G0_charset = IBMPC_MAP;
+		else if (c == 'K')
+			vc->vc_G0_charset = USER_MAP;
+		if (vc->vc_charset == 0)
+			vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
+		vc->vc_state = ESnormal;
+		return;
+	case ESsetG1:
+		if (c == '0')
+			vc->vc_G1_charset = GRAF_MAP;
+		else if (c == 'B')
+			vc->vc_G1_charset = LAT1_MAP;
+		else if (c == 'U')
+			vc->vc_G1_charset = IBMPC_MAP;
+		else if (c == 'K')
+			vc->vc_G1_charset = USER_MAP;
+		if (vc->vc_charset == 1)
+			vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
+		vc->vc_state = ESnormal;
+		return;
+	default:
+		vc->vc_state = ESnormal;
+	}
+}
+
+/* This is a temporary buffer used to prepare a tty console write
+ * so that we can easily avoid touching user space while holding the
+ * console spinlock.  It is allocated in con_init and is shared by
+ * this code and the vc_screen read/write tty calls.
+ *
+ * We have to allocate this statically in the kernel data section
+ * since console_init (and thus con_init) are called before any
+ * kernel memory allocation is available.
+ */
+char con_buf[CON_BUF_SIZE];
+DEFINE_MUTEX(con_buf_mtx);
+
+/* is_double_width() is based on the wcwidth() implementation by
+ * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
+ * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
+ */
+struct interval {
+	uint32_t first;
+	uint32_t last;
+};
+
+static int bisearch(uint32_t ucs, const struct interval *table, int max)
+{
+	int min = 0;
+	int mid;
+
+	if (ucs < table[0].first || ucs > table[max].last)
+		return 0;
+	while (max >= min) {
+		mid = (min + max) / 2;
+		if (ucs > table[mid].last)
+			min = mid + 1;
+		else if (ucs < table[mid].first)
+			max = mid - 1;
+		else
+			return 1;
+	}
+	return 0;
+}
+
+static int is_double_width(uint32_t ucs)
+{
+	static const struct interval double_width[] = {
+		{ 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
+		{ 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
+		{ 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
+		{ 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
+	};
+	return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
+}
+
+/* acquires console_sem */
+static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+#ifdef VT_BUF_VRAM_ONLY
+#define FLUSH do { } while(0);
+#else
+#define FLUSH if (draw_x >= 0) { \
+	vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
+	draw_x = -1; \
+	}
+#endif
+
+	int c, tc, ok, n = 0, draw_x = -1;
+	unsigned int currcons;
+	unsigned long draw_from = 0, draw_to = 0;
+	struct vc_data *vc;
+	unsigned char vc_attr;
+	struct vt_notifier_param param;
+	uint8_t rescan;
+	uint8_t inverse;
+	uint8_t width;
+	u16 himask, charmask;
+
+	if (in_interrupt())
+		return count;
+
+	might_sleep();
+
+	acquire_console_sem();
+	vc = tty->driver_data;
+	if (vc == NULL) {
+		printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
+		release_console_sem();
+		return 0;
+	}
+
+	currcons = vc->vc_num;
+	if (!vc_cons_allocated(currcons)) {
+	    /* could this happen? */
+		printk_once("con_write: tty %d not allocated\n", currcons+1);
+	    release_console_sem();
+	    return 0;
+	}
+
+	himask = vc->vc_hi_font_mask;
+	charmask = himask ? 0x1ff : 0xff;
+
+	/* undraw cursor first */
+	if (IS_FG(vc))
+		hide_cursor(vc);
+
+	param.vc = vc;
+
+	while (!tty->stopped && count) {
+		int orig = *buf;
+		c = orig;
+		buf++;
+		n++;
+		count--;
+		rescan = 0;
+		inverse = 0;
+		width = 1;
+
+		/* Do no translation at all in control states */
+		if (vc->vc_state != ESnormal) {
+			tc = c;
+		} else if (vc->vc_utf && !vc->vc_disp_ctrl) {
+		    /* Combine UTF-8 into Unicode in vc_utf_char.
+		     * vc_utf_count is the number of continuation bytes still
+		     * expected to arrive.
+		     * vc_npar is the number of continuation bytes arrived so
+		     * far
+		     */
+rescan_last_byte:
+		    if ((c & 0xc0) == 0x80) {
+			/* Continuation byte received */
+			static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
+			if (vc->vc_utf_count) {
+			    vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
+			    vc->vc_npar++;
+			    if (--vc->vc_utf_count) {
+				/* Still need some bytes */
+				continue;
+			    }
+			    /* Got a whole character */
+			    c = vc->vc_utf_char;
+			    /* Reject overlong sequences */
+			    if (c <= utf8_length_changes[vc->vc_npar - 1] ||
+					c > utf8_length_changes[vc->vc_npar])
+				c = 0xfffd;
+			} else {
+			    /* Unexpected continuation byte */
+			    vc->vc_utf_count = 0;
+			    c = 0xfffd;
+			}
+		    } else {
+			/* Single ASCII byte or first byte of a sequence received */
+			if (vc->vc_utf_count) {
+			    /* Continuation byte expected */
+			    rescan = 1;
+			    vc->vc_utf_count = 0;
+			    c = 0xfffd;
+			} else if (c > 0x7f) {
+			    /* First byte of a multibyte sequence received */
+			    vc->vc_npar = 0;
+			    if ((c & 0xe0) == 0xc0) {
+				vc->vc_utf_count = 1;
+				vc->vc_utf_char = (c & 0x1f);
+			    } else if ((c & 0xf0) == 0xe0) {
+				vc->vc_utf_count = 2;
+				vc->vc_utf_char = (c & 0x0f);
+			    } else if ((c & 0xf8) == 0xf0) {
+				vc->vc_utf_count = 3;
+				vc->vc_utf_char = (c & 0x07);
+			    } else if ((c & 0xfc) == 0xf8) {
+				vc->vc_utf_count = 4;
+				vc->vc_utf_char = (c & 0x03);
+			    } else if ((c & 0xfe) == 0xfc) {
+				vc->vc_utf_count = 5;
+				vc->vc_utf_char = (c & 0x01);
+			    } else {
+				/* 254 and 255 are invalid */
+				c = 0xfffd;
+			    }
+			    if (vc->vc_utf_count) {
+				/* Still need some bytes */
+				continue;
+			    }
+			}
+			/* Nothing to do if an ASCII byte was received */
+		    }
+		    /* End of UTF-8 decoding. */
+		    /* c is the received character, or U+FFFD for invalid sequences. */
+		    /* Replace invalid Unicode code points with U+FFFD too */
+		    if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
+			c = 0xfffd;
+		    tc = c;
+		} else {	/* no utf or alternate charset mode */
+		    tc = vc_translate(vc, c);
+		}
+
+		param.c = tc;
+		if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
+					&param) == NOTIFY_STOP)
+			continue;
+
+                /* If the original code was a control character we
+                 * only allow a glyph to be displayed if the code is
+                 * not normally used (such as for cursor movement) or
+                 * if the disp_ctrl mode has been explicitly enabled.
+                 * Certain characters (as given by the CTRL_ALWAYS
+                 * bitmap) are always displayed as control characters,
+                 * as the console would be pretty useless without
+                 * them; to display an arbitrary font position use the
+                 * direct-to-font zone in UTF-8 mode.
+                 */
+                ok = tc && (c >= 32 ||
+			    !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
+				  vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
+			&& (c != 127 || vc->vc_disp_ctrl)
+			&& (c != 128+27);
+
+		if (vc->vc_state == ESnormal && ok) {
+			if (vc->vc_utf && !vc->vc_disp_ctrl) {
+				if (is_double_width(c))
+					width = 2;
+			}
+			/* Now try to find out how to display it */
+			tc = conv_uni_to_pc(vc, tc);
+			if (tc & ~charmask) {
+				if (tc == -1 || tc == -2) {
+				    continue; /* nothing to display */
+				}
+				/* Glyph not found */
+				if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
+				    /* In legacy mode use the glyph we get by a 1:1 mapping.
+				       This would make absolutely no sense with Unicode in mind,
+				       but do this for ASCII characters since a font may lack
+				       Unicode mapping info and we don't want to end up with
+				       having question marks only. */
+				    tc = c;
+				} else {
+				    /* Display U+FFFD. If it's not found, display an inverse question mark. */
+				    tc = conv_uni_to_pc(vc, 0xfffd);
+				    if (tc < 0) {
+					inverse = 1;
+					tc = conv_uni_to_pc(vc, '?');
+					if (tc < 0) tc = '?';
+				    }
+				}
+			}
+
+			if (!inverse) {
+				vc_attr = vc->vc_attr;
+			} else {
+				/* invert vc_attr */
+				if (!vc->vc_can_do_color) {
+					vc_attr = (vc->vc_attr) ^ 0x08;
+				} else if (vc->vc_hi_font_mask == 0x100) {
+					vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
+				} else {
+					vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
+				}
+				FLUSH
+			}
+
+			while (1) {
+				if (vc->vc_need_wrap || vc->vc_decim)
+					FLUSH
+				if (vc->vc_need_wrap) {
+					cr(vc);
+					lf(vc);
+				}
+				if (vc->vc_decim)
+					insert_char(vc, 1);
+				scr_writew(himask ?
+					     ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
+					     (vc_attr << 8) + tc,
+					   (u16 *) vc->vc_pos);
+				if (DO_UPDATE(vc) && draw_x < 0) {
+					draw_x = vc->vc_x;
+					draw_from = vc->vc_pos;
+				}
+				if (vc->vc_x == vc->vc_cols - 1) {
+					vc->vc_need_wrap = vc->vc_decawm;
+					draw_to = vc->vc_pos + 2;
+				} else {
+					vc->vc_x++;
+					draw_to = (vc->vc_pos += 2);
+				}
+
+				if (!--width) break;
+
+				tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
+				if (tc < 0) tc = ' ';
+			}
+			notify_write(vc, c);
+
+			if (inverse) {
+				FLUSH
+			}
+
+			if (rescan) {
+				rescan = 0;
+				inverse = 0;
+				width = 1;
+				c = orig;
+				goto rescan_last_byte;
+			}
+			continue;
+		}
+		FLUSH
+		do_con_trol(tty, vc, orig);
+	}
+	FLUSH
+	console_conditional_schedule();
+	release_console_sem();
+	notify_update(vc);
+	return n;
+#undef FLUSH
+}
+
+/*
+ * This is the console switching callback.
+ *
+ * Doing console switching in a process context allows
+ * us to do the switches asynchronously (needed when we want
+ * to switch due to a keyboard interrupt).  Synchronization
+ * with other console code and prevention of re-entrancy is
+ * ensured with console_sem.
+ */
+static void console_callback(struct work_struct *ignored)
+{
+	acquire_console_sem();
+
+	if (want_console >= 0) {
+		if (want_console != fg_console &&
+		    vc_cons_allocated(want_console)) {
+			hide_cursor(vc_cons[fg_console].d);
+			change_console(vc_cons[want_console].d);
+			/* we only changed when the console had already
+			   been allocated - a new console is not created
+			   in an interrupt routine */
+		}
+		want_console = -1;
+	}
+	if (do_poke_blanked_console) { /* do not unblank for a LED change */
+		do_poke_blanked_console = 0;
+		poke_blanked_console();
+	}
+	if (scrollback_delta) {
+		struct vc_data *vc = vc_cons[fg_console].d;
+		clear_selection();
+		if (vc->vc_mode == KD_TEXT)
+			vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
+		scrollback_delta = 0;
+	}
+	if (blank_timer_expired) {
+		do_blank_screen(0);
+		blank_timer_expired = 0;
+	}
+	notify_update(vc_cons[fg_console].d);
+
+	release_console_sem();
+}
+
+int set_console(int nr)
+{
+	struct vc_data *vc = vc_cons[fg_console].d;
+
+	if (!vc_cons_allocated(nr) || vt_dont_switch ||
+		(vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
+
+		/*
+		 * Console switch will fail in console_callback() or
+		 * change_console() so there is no point scheduling
+		 * the callback
+		 *
+		 * Existing set_console() users don't check the return
+		 * value so this shouldn't break anything
+		 */
+		return -EINVAL;
+	}
+
+	want_console = nr;
+	schedule_console_callback();
+
+	return 0;
+}
+
+struct tty_driver *console_driver;
+
+#ifdef CONFIG_VT_CONSOLE
+
+/**
+ * vt_kmsg_redirect() - Sets/gets the kernel message console
+ * @new:	The new virtual terminal number or -1 if the console should stay
+ * 		unchanged
+ *
+ * By default, the kernel messages are always printed on the current virtual
+ * console. However, the user may modify that default with the
+ * TIOCL_SETKMSGREDIRECT ioctl call.
+ *
+ * This function sets the kernel message console to be @new. It returns the old
+ * virtual console number. The virtual terminal number 0 (both as parameter and
+ * return value) means no redirection (i.e. always printed on the currently
+ * active console).
+ *
+ * The parameter -1 means that only the current console is returned, but the
+ * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
+ * case to make the code more understandable.
+ *
+ * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
+ * the parameter and always returns 0.
+ */
+int vt_kmsg_redirect(int new)
+{
+	static int kmsg_con;
+
+	if (new != -1)
+		return xchg(&kmsg_con, new);
+	else
+		return kmsg_con;
+}
+
+/*
+ *	Console on virtual terminal
+ *
+ * The console must be locked when we get here.
+ */
+
+static void vt_console_print(struct console *co, const char *b, unsigned count)
+{
+	struct vc_data *vc = vc_cons[fg_console].d;
+	unsigned char c;
+	static DEFINE_SPINLOCK(printing_lock);
+	const ushort *start;
+	ushort cnt = 0;
+	ushort myx;
+	int kmsg_console;
+
+	/* console busy or not yet initialized */
+	if (!printable)
+		return;
+	if (!spin_trylock(&printing_lock))
+		return;
+
+	kmsg_console = vt_get_kmsg_redirect();
+	if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
+		vc = vc_cons[kmsg_console - 1].d;
+
+	/* read `x' only after setting currcons properly (otherwise
+	   the `x' macro will read the x of the foreground console). */
+	myx = vc->vc_x;
+
+	if (!vc_cons_allocated(fg_console)) {
+		/* impossible */
+		/* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
+		goto quit;
+	}
+
+	if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
+		goto quit;
+
+	/* undraw cursor first */
+	if (IS_FG(vc))
+		hide_cursor(vc);
+
+	start = (ushort *)vc->vc_pos;
+
+	/* Contrived structure to try to emulate original need_wrap behaviour
+	 * Problems caused when we have need_wrap set on '\n' character */
+	while (count--) {
+		c = *b++;
+		if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
+			if (cnt > 0) {
+				if (CON_IS_VISIBLE(vc))
+					vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
+				vc->vc_x += cnt;
+				if (vc->vc_need_wrap)
+					vc->vc_x--;
+				cnt = 0;
+			}
+			if (c == 8) {		/* backspace */
+				bs(vc);
+				start = (ushort *)vc->vc_pos;
+				myx = vc->vc_x;
+				continue;
+			}
+			if (c != 13)
+				lf(vc);
+			cr(vc);
+			start = (ushort *)vc->vc_pos;
+			myx = vc->vc_x;
+			if (c == 10 || c == 13)
+				continue;
+		}
+		scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
+		notify_write(vc, c);
+		cnt++;
+		if (myx == vc->vc_cols - 1) {
+			vc->vc_need_wrap = 1;
+			continue;
+		}
+		vc->vc_pos += 2;
+		myx++;
+	}
+	if (cnt > 0) {
+		if (CON_IS_VISIBLE(vc))
+			vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
+		vc->vc_x += cnt;
+		if (vc->vc_x == vc->vc_cols) {
+			vc->vc_x--;
+			vc->vc_need_wrap = 1;
+		}
+	}
+	set_cursor(vc);
+	notify_update(vc);
+
+quit:
+	spin_unlock(&printing_lock);
+}
+
+static struct tty_driver *vt_console_device(struct console *c, int *index)
+{
+	*index = c->index ? c->index-1 : fg_console;
+	return console_driver;
+}
+
+static struct console vt_console_driver = {
+	.name		= "tty",
+	.write		= vt_console_print,
+	.device		= vt_console_device,
+	.unblank	= unblank_screen,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+};
+#endif
+
+/*
+ *	Handling of Linux-specific VC ioctls
+ */
+
+/*
+ * Generally a bit racy with respect to console_sem().
+ *
+ * There are some functions which don't need it.
+ *
+ * There are some functions which can sleep for arbitrary periods
+ * (paste_selection) but we don't need the lock there anyway.
+ *
+ * set_selection has locking, and definitely needs it
+ */
+
+int tioclinux(struct tty_struct *tty, unsigned long arg)
+{
+	char type, data;
+	char __user *p = (char __user *)arg;
+	int lines;
+	int ret;
+
+	if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	if (get_user(type, p))
+		return -EFAULT;
+	ret = 0;
+
+	switch (type)
+	{
+		case TIOCL_SETSEL:
+			acquire_console_sem();
+			ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
+			release_console_sem();
+			break;
+		case TIOCL_PASTESEL:
+			ret = paste_selection(tty);
+			break;
+		case TIOCL_UNBLANKSCREEN:
+			acquire_console_sem();
+			unblank_screen();
+			release_console_sem();
+			break;
+		case TIOCL_SELLOADLUT:
+			ret = sel_loadlut(p);
+			break;
+		case TIOCL_GETSHIFTSTATE:
+
+	/*
+	 * Make it possible to react to Shift+Mousebutton.
+	 * Note that 'shift_state' is an undocumented
+	 * kernel-internal variable; programs not closely
+	 * related to the kernel should not use this.
+	 */
+	 		data = shift_state;
+			ret = __put_user(data, p);
+			break;
+		case TIOCL_GETMOUSEREPORTING:
+			data = mouse_reporting();
+			ret = __put_user(data, p);
+			break;
+		case TIOCL_SETVESABLANK:
+			ret = set_vesa_blanking(p);
+			break;
+		case TIOCL_GETKMSGREDIRECT:
+			data = vt_get_kmsg_redirect();
+			ret = __put_user(data, p);
+			break;
+		case TIOCL_SETKMSGREDIRECT:
+			if (!capable(CAP_SYS_ADMIN)) {
+				ret = -EPERM;
+			} else {
+				if (get_user(data, p+1))
+					ret = -EFAULT;
+				else
+					vt_kmsg_redirect(data);
+			}
+			break;
+		case TIOCL_GETFGCONSOLE:
+			ret = fg_console;
+			break;
+		case TIOCL_SCROLLCONSOLE:
+			if (get_user(lines, (s32 __user *)(p+4))) {
+				ret = -EFAULT;
+			} else {
+				scrollfront(vc_cons[fg_console].d, lines);
+				ret = 0;
+			}
+			break;
+		case TIOCL_BLANKSCREEN:	/* until explicitly unblanked, not only poked */
+			acquire_console_sem();
+			ignore_poke = 1;
+			do_blank_screen(0);
+			release_console_sem();
+			break;
+		case TIOCL_BLANKEDSCREEN:
+			ret = console_blanked;
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+	}
+	return ret;
+}
+
+/*
+ * /dev/ttyN handling
+ */
+
+static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+	int	retval;
+
+	retval = do_con_write(tty, buf, count);
+	con_flush_chars(tty);
+
+	return retval;
+}
+
+static int con_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	if (in_interrupt())
+		return 0;	/* n_r3964 calls put_char() from interrupt context */
+	return do_con_write(tty, &ch, 1);
+}
+
+static int con_write_room(struct tty_struct *tty)
+{
+	if (tty->stopped)
+		return 0;
+	return 32768;		/* No limit, really; we're not buffering */
+}
+
+static int con_chars_in_buffer(struct tty_struct *tty)
+{
+	return 0;		/* we're not buffering */
+}
+
+/*
+ * con_throttle and con_unthrottle are only used for
+ * paste_selection(), which has to stuff in a large number of
+ * characters...
+ */
+static void con_throttle(struct tty_struct *tty)
+{
+}
+
+static void con_unthrottle(struct tty_struct *tty)
+{
+	struct vc_data *vc = tty->driver_data;
+
+	wake_up_interruptible(&vc->paste_wait);
+}
+
+/*
+ * Turn the Scroll-Lock LED on when the tty is stopped
+ */
+static void con_stop(struct tty_struct *tty)
+{
+	int console_num;
+	if (!tty)
+		return;
+	console_num = tty->index;
+	if (!vc_cons_allocated(console_num))
+		return;
+	set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
+	set_leds();
+}
+
+/*
+ * Turn the Scroll-Lock LED off when the console is started
+ */
+static void con_start(struct tty_struct *tty)
+{
+	int console_num;
+	if (!tty)
+		return;
+	console_num = tty->index;
+	if (!vc_cons_allocated(console_num))
+		return;
+	clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
+	set_leds();
+}
+
+static void con_flush_chars(struct tty_struct *tty)
+{
+	struct vc_data *vc;
+
+	if (in_interrupt())	/* from flush_to_ldisc */
+		return;
+
+	/* if we race with con_close(), vt may be null */
+	acquire_console_sem();
+	vc = tty->driver_data;
+	if (vc)
+		set_cursor(vc);
+	release_console_sem();
+}
+
+/*
+ * Allocate the console screen memory.
+ */
+static int con_open(struct tty_struct *tty, struct file *filp)
+{
+	unsigned int currcons = tty->index;
+	int ret = 0;
+
+	acquire_console_sem();
+	if (tty->driver_data == NULL) {
+		ret = vc_allocate(currcons);
+		if (ret == 0) {
+			struct vc_data *vc = vc_cons[currcons].d;
+
+			/* Still being freed */
+			if (vc->port.tty) {
+				release_console_sem();
+				return -ERESTARTSYS;
+			}
+			tty->driver_data = vc;
+			vc->port.tty = tty;
+
+			if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
+				tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
+				tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
+			}
+			if (vc->vc_utf)
+				tty->termios->c_iflag |= IUTF8;
+			else
+				tty->termios->c_iflag &= ~IUTF8;
+			release_console_sem();
+			return ret;
+		}
+	}
+	release_console_sem();
+	return ret;
+}
+
+static void con_close(struct tty_struct *tty, struct file *filp)
+{
+	/* Nothing to do - we defer to shutdown */
+}
+
+static void con_shutdown(struct tty_struct *tty)
+{
+	struct vc_data *vc = tty->driver_data;
+	BUG_ON(vc == NULL);
+	acquire_console_sem();
+	vc->port.tty = NULL;
+	release_console_sem();
+	tty_shutdown(tty);
+}
+
+static int default_italic_color    = 2; // green (ASCII)
+static int default_underline_color = 3; // cyan (ASCII)
+module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
+module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
+
+static void vc_init(struct vc_data *vc, unsigned int rows,
+		    unsigned int cols, int do_clear)
+{
+	int j, k ;
+
+	vc->vc_cols = cols;
+	vc->vc_rows = rows;
+	vc->vc_size_row = cols << 1;
+	vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
+
+	set_origin(vc);
+	vc->vc_pos = vc->vc_origin;
+	reset_vc(vc);
+	for (j=k=0; j<16; j++) {
+		vc->vc_palette[k++] = default_red[j] ;
+		vc->vc_palette[k++] = default_grn[j] ;
+		vc->vc_palette[k++] = default_blu[j] ;
+	}
+	vc->vc_def_color       = 0x07;   /* white */
+	vc->vc_ulcolor         = default_underline_color;
+	vc->vc_itcolor         = default_italic_color;
+	vc->vc_halfcolor       = 0x08;   /* grey */
+	init_waitqueue_head(&vc->paste_wait);
+	reset_terminal(vc, do_clear);
+}
+
+/*
+ * This routine initializes console interrupts, and does nothing
+ * else. If you want the screen to clear, call tty_write with
+ * the appropriate escape-sequence.
+ */
+
+static int __init con_init(void)
+{
+	const char *display_desc = NULL;
+	struct vc_data *vc;
+	unsigned int currcons = 0, i;
+
+	acquire_console_sem();
+
+	if (conswitchp)
+		display_desc = conswitchp->con_startup();
+	if (!display_desc) {
+		fg_console = 0;
+		release_console_sem();
+		return 0;
+	}
+
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		struct con_driver *con_driver = &registered_con_driver[i];
+
+		if (con_driver->con == NULL) {
+			con_driver->con = conswitchp;
+			con_driver->desc = display_desc;
+			con_driver->flag = CON_DRIVER_FLAG_INIT;
+			con_driver->first = 0;
+			con_driver->last = MAX_NR_CONSOLES - 1;
+			break;
+		}
+	}
+
+	for (i = 0; i < MAX_NR_CONSOLES; i++)
+		con_driver_map[i] = conswitchp;
+
+	if (blankinterval) {
+		blank_state = blank_normal_wait;
+		mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+	}
+
+	for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
+		vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
+		INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+		tty_port_init(&vc->port);
+		visual_init(vc, currcons, 1);
+		vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
+		vc_init(vc, vc->vc_rows, vc->vc_cols,
+			currcons || !vc->vc_sw->con_save_screen);
+	}
+	currcons = fg_console = 0;
+	master_display_fg = vc = vc_cons[currcons].d;
+	set_origin(vc);
+	save_screen(vc);
+	gotoxy(vc, vc->vc_x, vc->vc_y);
+	csi_J(vc, 0);
+	update_screen(vc);
+	printk("Console: %s %s %dx%d",
+		vc->vc_can_do_color ? "colour" : "mono",
+		display_desc, vc->vc_cols, vc->vc_rows);
+	printable = 1;
+	printk("\n");
+
+	release_console_sem();
+
+#ifdef CONFIG_VT_CONSOLE
+	register_console(&vt_console_driver);
+#endif
+	return 0;
+}
+console_initcall(con_init);
+
+static const struct tty_operations con_ops = {
+	.open = con_open,
+	.close = con_close,
+	.write = con_write,
+	.write_room = con_write_room,
+	.put_char = con_put_char,
+	.flush_chars = con_flush_chars,
+	.chars_in_buffer = con_chars_in_buffer,
+	.ioctl = vt_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = vt_compat_ioctl,
+#endif
+	.stop = con_stop,
+	.start = con_start,
+	.throttle = con_throttle,
+	.unthrottle = con_unthrottle,
+	.resize = vt_resize,
+	.shutdown = con_shutdown
+};
+
+static struct cdev vc0_cdev;
+
+int __init vty_init(const struct file_operations *console_fops)
+{
+	cdev_init(&vc0_cdev, console_fops);
+	if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
+	    register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
+		panic("Couldn't register /dev/tty0 driver\n");
+	device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
+
+	vcs_init();
+
+	console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
+	if (!console_driver)
+		panic("Couldn't allocate console driver\n");
+	console_driver->owner = THIS_MODULE;
+	console_driver->name = "tty";
+	console_driver->name_base = 1;
+	console_driver->major = TTY_MAJOR;
+	console_driver->minor_start = 1;
+	console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
+	console_driver->init_termios = tty_std_termios;
+	if (default_utf8)
+		console_driver->init_termios.c_iflag |= IUTF8;
+	console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
+	tty_set_operations(console_driver, &con_ops);
+	if (tty_register_driver(console_driver))
+		panic("Couldn't register console driver\n");
+	kbd_init();
+	console_map_init();
+#ifdef CONFIG_MDA_CONSOLE
+	mda_console_init();
+#endif
+	return 0;
+}
+
+#ifndef VT_SINGLE_DRIVER
+
+static struct class *vtconsole_class;
+
+static int bind_con_driver(const struct consw *csw, int first, int last,
+			   int deflt)
+{
+	struct module *owner = csw->owner;
+	const char *desc = NULL;
+	struct con_driver *con_driver;
+	int i, j = -1, k = -1, retval = -ENODEV;
+
+	if (!try_module_get(owner))
+		return -ENODEV;
+
+	acquire_console_sem();
+
+	/* check if driver is registered */
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		con_driver = &registered_con_driver[i];
+
+		if (con_driver->con == csw) {
+			desc = con_driver->desc;
+			retval = 0;
+			break;
+		}
+	}
+
+	if (retval)
+		goto err;
+
+	if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
+		csw->con_startup();
+		con_driver->flag |= CON_DRIVER_FLAG_INIT;
+	}
+
+	if (deflt) {
+		if (conswitchp)
+			module_put(conswitchp->owner);
+
+		__module_get(owner);
+		conswitchp = csw;
+	}
+
+	first = max(first, con_driver->first);
+	last = min(last, con_driver->last);
+
+	for (i = first; i <= last; i++) {
+		int old_was_color;
+		struct vc_data *vc = vc_cons[i].d;
+
+		if (con_driver_map[i])
+			module_put(con_driver_map[i]->owner);
+		__module_get(owner);
+		con_driver_map[i] = csw;
+
+		if (!vc || !vc->vc_sw)
+			continue;
+
+		j = i;
+
+		if (CON_IS_VISIBLE(vc)) {
+			k = i;
+			save_screen(vc);
+		}
+
+		old_was_color = vc->vc_can_do_color;
+		vc->vc_sw->con_deinit(vc);
+		vc->vc_origin = (unsigned long)vc->vc_screenbuf;
+		visual_init(vc, i, 0);
+		set_origin(vc);
+		update_attr(vc);
+
+		/* If the console changed between mono <-> color, then
+		 * the attributes in the screenbuf will be wrong.  The
+		 * following resets all attributes to something sane.
+		 */
+		if (old_was_color != vc->vc_can_do_color)
+			clear_buffer_attributes(vc);
+	}
+
+	printk("Console: switching ");
+	if (!deflt)
+		printk("consoles %d-%d ", first+1, last+1);
+	if (j >= 0) {
+		struct vc_data *vc = vc_cons[j].d;
+
+		printk("to %s %s %dx%d\n",
+		       vc->vc_can_do_color ? "colour" : "mono",
+		       desc, vc->vc_cols, vc->vc_rows);
+
+		if (k >= 0) {
+			vc = vc_cons[k].d;
+			update_screen(vc);
+		}
+	} else
+		printk("to %s\n", desc);
+
+	retval = 0;
+err:
+	release_console_sem();
+	module_put(owner);
+	return retval;
+};
+
+#ifdef CONFIG_VT_HW_CONSOLE_BINDING
+static int con_is_graphics(const struct consw *csw, int first, int last)
+{
+	int i, retval = 0;
+
+	for (i = first; i <= last; i++) {
+		struct vc_data *vc = vc_cons[i].d;
+
+		if (vc && vc->vc_mode == KD_GRAPHICS) {
+			retval = 1;
+			break;
+		}
+	}
+
+	return retval;
+}
+
+/**
+ * unbind_con_driver - unbind a console driver
+ * @csw: pointer to console driver to unregister
+ * @first: first in range of consoles that @csw should be unbound from
+ * @last: last in range of consoles that @csw should be unbound from
+ * @deflt: should next bound console driver be default after @csw is unbound?
+ *
+ * To unbind a driver from all possible consoles, pass 0 as @first and
+ * %MAX_NR_CONSOLES as @last.
+ *
+ * @deflt controls whether the console that ends up replacing @csw should be
+ * the default console.
+ *
+ * RETURNS:
+ * -ENODEV if @csw isn't a registered console driver or can't be unregistered
+ * or 0 on success.
+ */
+int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
+{
+	struct module *owner = csw->owner;
+	const struct consw *defcsw = NULL;
+	struct con_driver *con_driver = NULL, *con_back = NULL;
+	int i, retval = -ENODEV;
+
+	if (!try_module_get(owner))
+		return -ENODEV;
+
+	acquire_console_sem();
+
+	/* check if driver is registered and if it is unbindable */
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		con_driver = &registered_con_driver[i];
+
+		if (con_driver->con == csw &&
+		    con_driver->flag & CON_DRIVER_FLAG_MODULE) {
+			retval = 0;
+			break;
+		}
+	}
+
+	if (retval) {
+		release_console_sem();
+		goto err;
+	}
+
+	retval = -ENODEV;
+
+	/* check if backup driver exists */
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		con_back = &registered_con_driver[i];
+
+		if (con_back->con &&
+		    !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
+			defcsw = con_back->con;
+			retval = 0;
+			break;
+		}
+	}
+
+	if (retval) {
+		release_console_sem();
+		goto err;
+	}
+
+	if (!con_is_bound(csw)) {
+		release_console_sem();
+		goto err;
+	}
+
+	first = max(first, con_driver->first);
+	last = min(last, con_driver->last);
+
+	for (i = first; i <= last; i++) {
+		if (con_driver_map[i] == csw) {
+			module_put(csw->owner);
+			con_driver_map[i] = NULL;
+		}
+	}
+
+	if (!con_is_bound(defcsw)) {
+		const struct consw *defconsw = conswitchp;
+
+		defcsw->con_startup();
+		con_back->flag |= CON_DRIVER_FLAG_INIT;
+		/*
+		 * vgacon may change the default driver to point
+		 * to dummycon, we restore it here...
+		 */
+		conswitchp = defconsw;
+	}
+
+	if (!con_is_bound(csw))
+		con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
+
+	release_console_sem();
+	/* ignore return value, binding should not fail */
+	bind_con_driver(defcsw, first, last, deflt);
+err:
+	module_put(owner);
+	return retval;
+
+}
+EXPORT_SYMBOL(unbind_con_driver);
+
+static int vt_bind(struct con_driver *con)
+{
+	const struct consw *defcsw = NULL, *csw = NULL;
+	int i, more = 1, first = -1, last = -1, deflt = 0;
+
+ 	if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
+	    con_is_graphics(con->con, con->first, con->last))
+		goto err;
+
+	csw = con->con;
+
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		struct con_driver *con = &registered_con_driver[i];
+
+		if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
+			defcsw = con->con;
+			break;
+		}
+	}
+
+	if (!defcsw)
+		goto err;
+
+	while (more) {
+		more = 0;
+
+		for (i = con->first; i <= con->last; i++) {
+			if (con_driver_map[i] == defcsw) {
+				if (first == -1)
+					first = i;
+				last = i;
+				more = 1;
+			} else if (first != -1)
+				break;
+		}
+
+		if (first == 0 && last == MAX_NR_CONSOLES -1)
+			deflt = 1;
+
+		if (first != -1)
+			bind_con_driver(csw, first, last, deflt);
+
+		first = -1;
+		last = -1;
+		deflt = 0;
+	}
+
+err:
+	return 0;
+}
+
+static int vt_unbind(struct con_driver *con)
+{
+	const struct consw *csw = NULL;
+	int i, more = 1, first = -1, last = -1, deflt = 0;
+
+ 	if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
+	    con_is_graphics(con->con, con->first, con->last))
+		goto err;
+
+	csw = con->con;
+
+	while (more) {
+		more = 0;
+
+		for (i = con->first; i <= con->last; i++) {
+			if (con_driver_map[i] == csw) {
+				if (first == -1)
+					first = i;
+				last = i;
+				more = 1;
+			} else if (first != -1)
+				break;
+		}
+
+		if (first == 0 && last == MAX_NR_CONSOLES -1)
+			deflt = 1;
+
+		if (first != -1)
+			unbind_con_driver(csw, first, last, deflt);
+
+		first = -1;
+		last = -1;
+		deflt = 0;
+	}
+
+err:
+	return 0;
+}
+#else
+static inline int vt_bind(struct con_driver *con)
+{
+	return 0;
+}
+static inline int vt_unbind(struct con_driver *con)
+{
+	return 0;
+}
+#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
+
+static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct con_driver *con = dev_get_drvdata(dev);
+	int bind = simple_strtoul(buf, NULL, 0);
+
+	if (bind)
+		vt_bind(con);
+	else
+		vt_unbind(con);
+
+	return count;
+}
+
+static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct con_driver *con = dev_get_drvdata(dev);
+	int bind = con_is_bound(con->con);
+
+	return snprintf(buf, PAGE_SIZE, "%i\n", bind);
+}
+
+static ssize_t show_name(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct con_driver *con = dev_get_drvdata(dev);
+
+	return snprintf(buf, PAGE_SIZE, "%s %s\n",
+			(con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
+			 con->desc);
+
+}
+
+static struct device_attribute device_attrs[] = {
+	__ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
+	__ATTR(name, S_IRUGO, show_name, NULL),
+};
+
+static int vtconsole_init_device(struct con_driver *con)
+{
+	int i;
+	int error = 0;
+
+	con->flag |= CON_DRIVER_FLAG_ATTR;
+	dev_set_drvdata(con->dev, con);
+	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
+		error = device_create_file(con->dev, &device_attrs[i]);
+		if (error)
+			break;
+	}
+
+	if (error) {
+		while (--i >= 0)
+			device_remove_file(con->dev, &device_attrs[i]);
+		con->flag &= ~CON_DRIVER_FLAG_ATTR;
+	}
+
+	return error;
+}
+
+static void vtconsole_deinit_device(struct con_driver *con)
+{
+	int i;
+
+	if (con->flag & CON_DRIVER_FLAG_ATTR) {
+		for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
+			device_remove_file(con->dev, &device_attrs[i]);
+		con->flag &= ~CON_DRIVER_FLAG_ATTR;
+	}
+}
+
+/**
+ * con_is_bound - checks if driver is bound to the console
+ * @csw: console driver
+ *
+ * RETURNS: zero if unbound, nonzero if bound
+ *
+ * Drivers can call this and if zero, they should release
+ * all resources allocated on con_startup()
+ */
+int con_is_bound(const struct consw *csw)
+{
+	int i, bound = 0;
+
+	for (i = 0; i < MAX_NR_CONSOLES; i++) {
+		if (con_driver_map[i] == csw) {
+			bound = 1;
+			break;
+		}
+	}
+
+	return bound;
+}
+EXPORT_SYMBOL(con_is_bound);
+
+/**
+ * con_debug_enter - prepare the console for the kernel debugger
+ * @sw: console driver
+ *
+ * Called when the console is taken over by the kernel debugger, this
+ * function needs to save the current console state, then put the console
+ * into a state suitable for the kernel debugger.
+ *
+ * RETURNS:
+ * Zero on success, nonzero if a failure occurred when trying to prepare
+ * the console for the debugger.
+ */
+int con_debug_enter(struct vc_data *vc)
+{
+	int ret = 0;
+
+	saved_fg_console = fg_console;
+	saved_last_console = last_console;
+	saved_want_console = want_console;
+	saved_vc_mode = vc->vc_mode;
+	saved_console_blanked = console_blanked;
+	vc->vc_mode = KD_TEXT;
+	console_blanked = 0;
+	if (vc->vc_sw->con_debug_enter)
+		ret = vc->vc_sw->con_debug_enter(vc);
+#ifdef CONFIG_KGDB_KDB
+	/* Set the initial LINES variable if it is not already set */
+	if (vc->vc_rows < 999) {
+		int linecount;
+		char lns[4];
+		const char *setargs[3] = {
+			"set",
+			"LINES",
+			lns,
+		};
+		if (kdbgetintenv(setargs[0], &linecount)) {
+			snprintf(lns, 4, "%i", vc->vc_rows);
+			kdb_set(2, setargs);
+		}
+	}
+#endif /* CONFIG_KGDB_KDB */
+	return ret;
+}
+EXPORT_SYMBOL_GPL(con_debug_enter);
+
+/**
+ * con_debug_leave - restore console state
+ * @sw: console driver
+ *
+ * Restore the console state to what it was before the kernel debugger
+ * was invoked.
+ *
+ * RETURNS:
+ * Zero on success, nonzero if a failure occurred when trying to restore
+ * the console.
+ */
+int con_debug_leave(void)
+{
+	struct vc_data *vc;
+	int ret = 0;
+
+	fg_console = saved_fg_console;
+	last_console = saved_last_console;
+	want_console = saved_want_console;
+	console_blanked = saved_console_blanked;
+	vc_cons[fg_console].d->vc_mode = saved_vc_mode;
+
+	vc = vc_cons[fg_console].d;
+	if (vc->vc_sw->con_debug_leave)
+		ret = vc->vc_sw->con_debug_leave(vc);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(con_debug_leave);
+
+/**
+ * register_con_driver - register console driver to console layer
+ * @csw: console driver
+ * @first: the first console to take over, minimum value is 0
+ * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
+ *
+ * DESCRIPTION: This function registers a console driver which can later
+ * bind to a range of consoles specified by @first and @last. It will
+ * also initialize the console driver by calling con_startup().
+ */
+int register_con_driver(const struct consw *csw, int first, int last)
+{
+	struct module *owner = csw->owner;
+	struct con_driver *con_driver;
+	const char *desc;
+	int i, retval = 0;
+
+	if (!try_module_get(owner))
+		return -ENODEV;
+
+	acquire_console_sem();
+
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		con_driver = &registered_con_driver[i];
+
+		/* already registered */
+		if (con_driver->con == csw)
+			retval = -EINVAL;
+	}
+
+	if (retval)
+		goto err;
+
+	desc = csw->con_startup();
+
+	if (!desc)
+		goto err;
+
+	retval = -EINVAL;
+
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		con_driver = &registered_con_driver[i];
+
+		if (con_driver->con == NULL) {
+			con_driver->con = csw;
+			con_driver->desc = desc;
+			con_driver->node = i;
+			con_driver->flag = CON_DRIVER_FLAG_MODULE |
+			                   CON_DRIVER_FLAG_INIT;
+			con_driver->first = first;
+			con_driver->last = last;
+			retval = 0;
+			break;
+		}
+	}
+
+	if (retval)
+		goto err;
+
+	con_driver->dev = device_create(vtconsole_class, NULL,
+						MKDEV(0, con_driver->node),
+						NULL, "vtcon%i",
+						con_driver->node);
+
+	if (IS_ERR(con_driver->dev)) {
+		printk(KERN_WARNING "Unable to create device for %s; "
+		       "errno = %ld\n", con_driver->desc,
+		       PTR_ERR(con_driver->dev));
+		con_driver->dev = NULL;
+	} else {
+		vtconsole_init_device(con_driver);
+	}
+
+err:
+	release_console_sem();
+	module_put(owner);
+	return retval;
+}
+EXPORT_SYMBOL(register_con_driver);
+
+/**
+ * unregister_con_driver - unregister console driver from console layer
+ * @csw: console driver
+ *
+ * DESCRIPTION: All drivers that registers to the console layer must
+ * call this function upon exit, or if the console driver is in a state
+ * where it won't be able to handle console services, such as the
+ * framebuffer console without loaded framebuffer drivers.
+ *
+ * The driver must unbind first prior to unregistration.
+ */
+int unregister_con_driver(const struct consw *csw)
+{
+	int i, retval = -ENODEV;
+
+	acquire_console_sem();
+
+	/* cannot unregister a bound driver */
+	if (con_is_bound(csw))
+		goto err;
+
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		struct con_driver *con_driver = &registered_con_driver[i];
+
+		if (con_driver->con == csw &&
+		    con_driver->flag & CON_DRIVER_FLAG_MODULE) {
+			vtconsole_deinit_device(con_driver);
+			device_destroy(vtconsole_class,
+				       MKDEV(0, con_driver->node));
+			con_driver->con = NULL;
+			con_driver->desc = NULL;
+			con_driver->dev = NULL;
+			con_driver->node = 0;
+			con_driver->flag = 0;
+			con_driver->first = 0;
+			con_driver->last = 0;
+			retval = 0;
+			break;
+		}
+	}
+err:
+	release_console_sem();
+	return retval;
+}
+EXPORT_SYMBOL(unregister_con_driver);
+
+/*
+ *	If we support more console drivers, this function is used
+ *	when a driver wants to take over some existing consoles
+ *	and become default driver for newly opened ones.
+ *
+ *      take_over_console is basically a register followed by unbind
+ */
+int take_over_console(const struct consw *csw, int first, int last, int deflt)
+{
+	int err;
+
+	err = register_con_driver(csw, first, last);
+
+	if (!err)
+		bind_con_driver(csw, first, last, deflt);
+
+	return err;
+}
+
+/*
+ * give_up_console is a wrapper to unregister_con_driver. It will only
+ * work if driver is fully unbound.
+ */
+void give_up_console(const struct consw *csw)
+{
+	unregister_con_driver(csw);
+}
+
+static int __init vtconsole_class_init(void)
+{
+	int i;
+
+	vtconsole_class = class_create(THIS_MODULE, "vtconsole");
+	if (IS_ERR(vtconsole_class)) {
+		printk(KERN_WARNING "Unable to create vt console class; "
+		       "errno = %ld\n", PTR_ERR(vtconsole_class));
+		vtconsole_class = NULL;
+	}
+
+	/* Add system drivers to sysfs */
+	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+		struct con_driver *con = &registered_con_driver[i];
+
+		if (con->con && !con->dev) {
+			con->dev = device_create(vtconsole_class, NULL,
+							 MKDEV(0, con->node),
+							 NULL, "vtcon%i",
+							 con->node);
+
+			if (IS_ERR(con->dev)) {
+				printk(KERN_WARNING "Unable to create "
+				       "device for %s; errno = %ld\n",
+				       con->desc, PTR_ERR(con->dev));
+				con->dev = NULL;
+			} else {
+				vtconsole_init_device(con);
+			}
+		}
+	}
+
+	return 0;
+}
+postcore_initcall(vtconsole_class_init);
+
+#endif
+
+/*
+ *	Screen blanking
+ */
+
+static int set_vesa_blanking(char __user *p)
+{
+	unsigned int mode;
+
+	if (get_user(mode, p + 1))
+		return -EFAULT;
+
+	vesa_blank_mode = (mode < 4) ? mode : 0;
+	return 0;
+}
+
+void do_blank_screen(int entering_gfx)
+{
+	struct vc_data *vc = vc_cons[fg_console].d;
+	int i;
+
+	WARN_CONSOLE_UNLOCKED();
+
+	if (console_blanked) {
+		if (blank_state == blank_vesa_wait) {
+			blank_state = blank_off;
+			vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
+		}
+		return;
+	}
+
+	/* entering graphics mode? */
+	if (entering_gfx) {
+		hide_cursor(vc);
+		save_screen(vc);
+		vc->vc_sw->con_blank(vc, -1, 1);
+		console_blanked = fg_console + 1;
+		blank_state = blank_off;
+		set_origin(vc);
+		return;
+	}
+
+	if (blank_state != blank_normal_wait)
+		return;
+	blank_state = blank_off;
+
+	/* don't blank graphics */
+	if (vc->vc_mode != KD_TEXT) {
+		console_blanked = fg_console + 1;
+		return;
+	}
+
+	hide_cursor(vc);
+	del_timer_sync(&console_timer);
+	blank_timer_expired = 0;
+
+	save_screen(vc);
+	/* In case we need to reset origin, blanking hook returns 1 */
+	i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
+	console_blanked = fg_console + 1;
+	if (i)
+		set_origin(vc);
+
+	if (console_blank_hook && console_blank_hook(1))
+		return;
+
+	if (vesa_off_interval && vesa_blank_mode) {
+		blank_state = blank_vesa_wait;
+		mod_timer(&console_timer, jiffies + vesa_off_interval);
+	}
+	vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
+}
+EXPORT_SYMBOL(do_blank_screen);
+
+/*
+ * Called by timer as well as from vt_console_driver
+ */
+void do_unblank_screen(int leaving_gfx)
+{
+	struct vc_data *vc;
+
+	/* This should now always be called from a "sane" (read: can schedule)
+	 * context for the sake of the low level drivers, except in the special
+	 * case of oops_in_progress
+	 */
+	if (!oops_in_progress)
+		might_sleep();
+
+	WARN_CONSOLE_UNLOCKED();
+
+	ignore_poke = 0;
+	if (!console_blanked)
+		return;
+	if (!vc_cons_allocated(fg_console)) {
+		/* impossible */
+		printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
+		return;
+	}
+	vc = vc_cons[fg_console].d;
+	/* Try to unblank in oops case too */
+	if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
+		return; /* but leave console_blanked != 0 */
+
+	if (blankinterval) {
+		mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+		blank_state = blank_normal_wait;
+	}
+
+	console_blanked = 0;
+	if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
+		/* Low-level driver cannot restore -> do it ourselves */
+		update_screen(vc);
+	if (console_blank_hook)
+		console_blank_hook(0);
+	set_palette(vc);
+	set_cursor(vc);
+	vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
+}
+EXPORT_SYMBOL(do_unblank_screen);
+
+/*
+ * This is called by the outside world to cause a forced unblank, mostly for
+ * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
+ * call it with 1 as an argument and so force a mode restore... that may kill
+ * X or at least garbage the screen but would also make the Oops visible...
+ */
+void unblank_screen(void)
+{
+	do_unblank_screen(0);
+}
+
+/*
+ * We defer the timer blanking to work queue so it can take the console mutex
+ * (console operations can still happen at irq time, but only from printk which
+ * has the console mutex. Not perfect yet, but better than no locking
+ */
+static void blank_screen_t(unsigned long dummy)
+{
+	if (unlikely(!keventd_up())) {
+		mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+		return;
+	}
+	blank_timer_expired = 1;
+	schedule_work(&console_work);
+}
+
+void poke_blanked_console(void)
+{
+	WARN_CONSOLE_UNLOCKED();
+
+	/* Add this so we quickly catch whoever might call us in a non
+	 * safe context. Nowadays, unblank_screen() isn't to be called in
+	 * atomic contexts and is allowed to schedule (with the special case
+	 * of oops_in_progress, but that isn't of any concern for this
+	 * function. --BenH.
+	 */
+	might_sleep();
+
+	/* This isn't perfectly race free, but a race here would be mostly harmless,
+	 * at worse, we'll do a spurrious blank and it's unlikely
+	 */
+	del_timer(&console_timer);
+	blank_timer_expired = 0;
+
+	if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
+		return;
+	if (console_blanked)
+		unblank_screen();
+	else if (blankinterval) {
+		mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+		blank_state = blank_normal_wait;
+	}
+}
+
+/*
+ *	Palettes
+ */
+
+static void set_palette(struct vc_data *vc)
+{
+	WARN_CONSOLE_UNLOCKED();
+
+	if (vc->vc_mode != KD_GRAPHICS)
+		vc->vc_sw->con_set_palette(vc, color_table);
+}
+
+static int set_get_cmap(unsigned char __user *arg, int set)
+{
+    int i, j, k;
+
+    WARN_CONSOLE_UNLOCKED();
+
+    for (i = 0; i < 16; i++)
+	if (set) {
+	    get_user(default_red[i], arg++);
+	    get_user(default_grn[i], arg++);
+	    get_user(default_blu[i], arg++);
+	} else {
+	    put_user(default_red[i], arg++);
+	    put_user(default_grn[i], arg++);
+	    put_user(default_blu[i], arg++);
+	}
+    if (set) {
+	for (i = 0; i < MAX_NR_CONSOLES; i++)
+	    if (vc_cons_allocated(i)) {
+		for (j = k = 0; j < 16; j++) {
+		    vc_cons[i].d->vc_palette[k++] = default_red[j];
+		    vc_cons[i].d->vc_palette[k++] = default_grn[j];
+		    vc_cons[i].d->vc_palette[k++] = default_blu[j];
+		}
+		set_palette(vc_cons[i].d);
+	    }
+    }
+    return 0;
+}
+
+/*
+ * Load palette into the DAC registers. arg points to a colour
+ * map, 3 bytes per colour, 16 colours, range from 0 to 255.
+ */
+
+int con_set_cmap(unsigned char __user *arg)
+{
+	int rc;
+
+	acquire_console_sem();
+	rc = set_get_cmap (arg,1);
+	release_console_sem();
+
+	return rc;
+}
+
+int con_get_cmap(unsigned char __user *arg)
+{
+	int rc;
+
+	acquire_console_sem();
+	rc = set_get_cmap (arg,0);
+	release_console_sem();
+
+	return rc;
+}
+
+void reset_palette(struct vc_data *vc)
+{
+	int j, k;
+	for (j=k=0; j<16; j++) {
+		vc->vc_palette[k++] = default_red[j];
+		vc->vc_palette[k++] = default_grn[j];
+		vc->vc_palette[k++] = default_blu[j];
+	}
+	set_palette(vc);
+}
+
+/*
+ *  Font switching
+ *
+ *  Currently we only support fonts up to 32 pixels wide, at a maximum height
+ *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
+ *  depending on width) reserved for each character which is kinda wasty, but 
+ *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
+ *  is upto the actual low-level console-driver convert data into its favorite
+ *  format (maybe we should add a `fontoffset' field to the `display'
+ *  structure so we won't have to convert the fontdata all the time.
+ *  /Jes
+ */
+
+#define max_font_size 65536
+
+static int con_font_get(struct vc_data *vc, struct console_font_op *op)
+{
+	struct console_font font;
+	int rc = -EINVAL;
+	int c;
+
+	if (vc->vc_mode != KD_TEXT)
+		return -EINVAL;
+
+	if (op->data) {
+		font.data = kmalloc(max_font_size, GFP_KERNEL);
+		if (!font.data)
+			return -ENOMEM;
+	} else
+		font.data = NULL;
+
+	acquire_console_sem();
+	if (vc->vc_sw->con_font_get)
+		rc = vc->vc_sw->con_font_get(vc, &font);
+	else
+		rc = -ENOSYS;
+	release_console_sem();
+
+	if (rc)
+		goto out;
+
+	c = (font.width+7)/8 * 32 * font.charcount;
+
+	if (op->data && font.charcount > op->charcount)
+		rc = -ENOSPC;
+	if (!(op->flags & KD_FONT_FLAG_OLD)) {
+		if (font.width > op->width || font.height > op->height) 
+			rc = -ENOSPC;
+	} else {
+		if (font.width != 8)
+			rc = -EIO;
+		else if ((op->height && font.height > op->height) ||
+			 font.height > 32)
+			rc = -ENOSPC;
+	}
+	if (rc)
+		goto out;
+
+	op->height = font.height;
+	op->width = font.width;
+	op->charcount = font.charcount;
+
+	if (op->data && copy_to_user(op->data, font.data, c))
+		rc = -EFAULT;
+
+out:
+	kfree(font.data);
+	return rc;
+}
+
+static int con_font_set(struct vc_data *vc, struct console_font_op *op)
+{
+	struct console_font font;
+	int rc = -EINVAL;
+	int size;
+
+	if (vc->vc_mode != KD_TEXT)
+		return -EINVAL;
+	if (!op->data)
+		return -EINVAL;
+	if (op->charcount > 512)
+		return -EINVAL;
+	if (!op->height) {		/* Need to guess font height [compat] */
+		int h, i;
+		u8 __user *charmap = op->data;
+		u8 tmp;
+		
+		/* If from KDFONTOP ioctl, don't allow things which can be done in userland,
+		   so that we can get rid of this soon */
+		if (!(op->flags & KD_FONT_FLAG_OLD))
+			return -EINVAL;
+		for (h = 32; h > 0; h--)
+			for (i = 0; i < op->charcount; i++) {
+				if (get_user(tmp, &charmap[32*i+h-1]))
+					return -EFAULT;
+				if (tmp)
+					goto nonzero;
+			}
+		return -EINVAL;
+	nonzero:
+		op->height = h;
+	}
+	if (op->width <= 0 || op->width > 32 || op->height > 32)
+		return -EINVAL;
+	size = (op->width+7)/8 * 32 * op->charcount;
+	if (size > max_font_size)
+		return -ENOSPC;
+	font.charcount = op->charcount;
+	font.height = op->height;
+	font.width = op->width;
+	font.data = memdup_user(op->data, size);
+	if (IS_ERR(font.data))
+		return PTR_ERR(font.data);
+	acquire_console_sem();
+	if (vc->vc_sw->con_font_set)
+		rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
+	else
+		rc = -ENOSYS;
+	release_console_sem();
+	kfree(font.data);
+	return rc;
+}
+
+static int con_font_default(struct vc_data *vc, struct console_font_op *op)
+{
+	struct console_font font = {.width = op->width, .height = op->height};
+	char name[MAX_FONT_NAME];
+	char *s = name;
+	int rc;
+
+	if (vc->vc_mode != KD_TEXT)
+		return -EINVAL;
+
+	if (!op->data)
+		s = NULL;
+	else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
+		return -EFAULT;
+	else
+		name[MAX_FONT_NAME - 1] = 0;
+
+	acquire_console_sem();
+	if (vc->vc_sw->con_font_default)
+		rc = vc->vc_sw->con_font_default(vc, &font, s);
+	else
+		rc = -ENOSYS;
+	release_console_sem();
+	if (!rc) {
+		op->width = font.width;
+		op->height = font.height;
+	}
+	return rc;
+}
+
+static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
+{
+	int con = op->height;
+	int rc;
+
+	if (vc->vc_mode != KD_TEXT)
+		return -EINVAL;
+
+	acquire_console_sem();
+	if (!vc->vc_sw->con_font_copy)
+		rc = -ENOSYS;
+	else if (con < 0 || !vc_cons_allocated(con))
+		rc = -ENOTTY;
+	else if (con == vc->vc_num)	/* nothing to do */
+		rc = 0;
+	else
+		rc = vc->vc_sw->con_font_copy(vc, con);
+	release_console_sem();
+	return rc;
+}
+
+int con_font_op(struct vc_data *vc, struct console_font_op *op)
+{
+	switch (op->op) {
+	case KD_FONT_OP_SET:
+		return con_font_set(vc, op);
+	case KD_FONT_OP_GET:
+		return con_font_get(vc, op);
+	case KD_FONT_OP_SET_DEFAULT:
+		return con_font_default(vc, op);
+	case KD_FONT_OP_COPY:
+		return con_font_copy(vc, op);
+	}
+	return -ENOSYS;
+}
+
+/*
+ *	Interface exported to selection and vcs.
+ */
+
+/* used by selection */
+u16 screen_glyph(struct vc_data *vc, int offset)
+{
+	u16 w = scr_readw(screenpos(vc, offset, 1));
+	u16 c = w & 0xff;
+
+	if (w & vc->vc_hi_font_mask)
+		c |= 0x100;
+	return c;
+}
+EXPORT_SYMBOL_GPL(screen_glyph);
+
+/* used by vcs - note the word offset */
+unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
+{
+	return screenpos(vc, 2 * w_offset, viewed);
+}
+
+void getconsxy(struct vc_data *vc, unsigned char *p)
+{
+	p[0] = vc->vc_x;
+	p[1] = vc->vc_y;
+}
+
+void putconsxy(struct vc_data *vc, unsigned char *p)
+{
+	hide_cursor(vc);
+	gotoxy(vc, p[0], p[1]);
+	set_cursor(vc);
+}
+
+u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
+{
+	if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
+		return softcursor_original;
+	return scr_readw(org);
+}
+
+void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
+{
+	scr_writew(val, org);
+	if ((unsigned long)org == vc->vc_pos) {
+		softcursor_original = -1;
+		add_softcursor(vc);
+	}
+}
+
+void vcs_scr_updated(struct vc_data *vc)
+{
+	notify_update(vc);
+}
+
+/*
+ *	Visible symbols for modules
+ */
+
+EXPORT_SYMBOL(color_table);
+EXPORT_SYMBOL(default_red);
+EXPORT_SYMBOL(default_grn);
+EXPORT_SYMBOL(default_blu);
+EXPORT_SYMBOL(update_region);
+EXPORT_SYMBOL(redraw_screen);
+EXPORT_SYMBOL(vc_resize);
+EXPORT_SYMBOL(fg_console);
+EXPORT_SYMBOL(console_blank_hook);
+EXPORT_SYMBOL(console_blanked);
+EXPORT_SYMBOL(vc_cons);
+EXPORT_SYMBOL(global_cursor_default);
+#ifndef VT_SINGLE_DRIVER
+EXPORT_SYMBOL(take_over_console);
+EXPORT_SYMBOL(give_up_console);
+#endif