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vt.c

/*
 *  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>

#define MAX_NR_CON_DRIVER 16

#define CON_DRIVER_FLAG_MODULE 1
#define CON_DRIVER_FLAG_INIT   2
#define CON_DRIVER_FLAG_ATTR   4

00114 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);

/*
 * 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,
 * kmsg_redirect is the console for kernel messages,
 */
int fg_console;
int last_console;
int want_console = -1;
int kmsg_redirect;

/*
 * 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;
}

static inline void scrolldelta(int lines)
{
      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);
            }
            if (update && vc->vc_mode != KD_GRAPHICS)
                  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_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;
          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;
          }
          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 neccessary 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 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 end, 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;
                  end = vc->vc_scr_end;
            } 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 * new_rows);
            }
      } else
            /*
             * Cursor near the top, copy contents from the top of buffer
             */
            end = (old_rows > new_rows) ? old_origin +
                  (old_row_size * new_rows) :
                  vc->vc_scr_end;

      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);
      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->vc_tty
 */

int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
{
      return vc_do_resize(vc->vc_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            = 1;
      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 ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
                  vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
                  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
 */
02056 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;
      const unsigned char *orig_buf = NULL;
      int orig_count;

      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? */
          static int error = 0;
          if (!error) {
            error = 1;
            printk("con_write: tty %d not allocated\n", currcons+1);
          }
          release_console_sem();
          return 0;
      }
      orig_buf = buf;
      orig_count = count;

      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

/*
 *    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;

      /* console busy or not yet initialized */
      if (!printable)
            return;
      if (!spin_trylock(&printing_lock))
            return;

      if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
            vc = vc_cons[kmsg_redirect - 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)
            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;

      lock_kernel();

      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 = 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
                              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;
      }
      unlock_kernel();
      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->vc_tty) {
                        release_console_sem();
                        return -ERESTARTSYS;
                  }
                  tty->driver_data = vc;
                  vc->vc_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->vc_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);
            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,
      .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_PROM_CONSOLE
      prom_con_init();
#endif
#ifdef CONFIG_MDA_CONSOLE
      mda_console_init();
#endif
      return 0;
}

#ifndef VT_SINGLE_DRIVER
#include <linux/device.h>

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);

/**
 * 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);
      }
}
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;
      if (vc->vc_mode != KD_TEXT)
            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))
            /* 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);
}
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 = kmalloc(size, GFP_KERNEL);
      if (!font.data)
            return -ENOMEM;
      if (copy_from_user(font.data, op->data, size)) {
            kfree(font.data);
            return -EFAULT;
      }
      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);
      }
}

/*
 *    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);
#ifndef VT_SINGLE_DRIVER
EXPORT_SYMBOL(take_over_console);
EXPORT_SYMBOL(give_up_console);
#endif

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