vt.c 94.4 KB
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/*
 *  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 <andrewm@uow.edu.au>
 *
 * Removed console_lock, enabled interrupts across all console operations
 * 13 March 2001, Andrew Morton
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 *
 * 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
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 */

#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>
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#include <linux/mutex.h>
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#include <linux/vt_kern.h>
#include <linux/selection.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/bootmem.h>
#include <linux/pm.h>
#include <linux/font.h>
#include <linux/bitops.h>

#include <asm/io.h>
#include <asm/system.h>
#include <asm/uaccess.h>

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#define MAX_NR_CON_DRIVER 16
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#define CON_DRIVER_FLAG_MODULE 1
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#define CON_DRIVER_FLAG_INIT   2
#define CON_DRIVER_FLAG_ATTR   4
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struct con_driver {
	const struct consw *con;
	const char *desc;
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	struct device *dev;
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	int node;
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	int first;
	int last;
	int flag;
};

static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
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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);
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static int set_vesa_blanking(char __user *p);
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static void set_cursor(struct vc_data *vc);
static void hide_cursor(struct vc_data *vc);
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static void console_callback(struct work_struct *ignored);
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static void blank_screen_t(unsigned long dummy);
static void set_palette(struct vc_data *vc);

static int printable;		/* Is console ready for printing? */
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static int default_utf8;
module_param(default_utf8, int, S_IRUGO | S_IWUSR);
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/*
 * 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 blankinterval = 10*60*HZ;
static int vesa_off_interval;

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static DECLARE_WORK(console_work, console_callback);
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/*
 * 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);

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static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
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static int blank_state;
static int blank_timer_expired;
enum {
	blank_off = 0,
	blank_normal_wait,
	blank_vesa_wait,
};

/*
 *	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)
#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 */

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static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
    u8 _underline, u8 _reverse, u8 _italic)
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{
	if (vc->vc_sw->con_build_attr)
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		return vc->vc_sw->con_build_attr(vc, _color, _intensity,
		       _blink, _underline, _reverse, _italic);
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#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 = vc->vc_color;
	if (!vc->vc_can_do_color)
		return _intensity |
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		       (_italic ? 2 : 0) |
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		       (_underline ? 4 : 0) |
		       (_reverse ? 8 : 0) |
		       (_blink ? 0x80 : 0);
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	if (_italic)
		a = (a & 0xF0) | vc->vc_itcolor;
	else if (_underline)
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		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)
{
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	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) | ' ';
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}

/* 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)
{
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	static int old_offset = -1;
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	static unsigned short old;
	static unsigned short oldx, oldy;

	WARN_CONSOLE_UNLOCKED();

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	if (old_offset != -1 && old_offset >= 0 &&
	    old_offset < vc->vc_screenbuf_size) {
		scr_writew(old, screenpos(vc, old_offset, 1));
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		if (DO_UPDATE(vc))
			vc->vc_sw->con_putc(vc, old, oldy, oldx);
	}
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	old_offset = offset;

	if (offset != -1 && offset >= 0 &&
	    offset < vc->vc_screenbuf_size) {
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		unsigned short new;
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		unsigned short *p;
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		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);
		}
	}
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}

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();
	}
}

/*
 *	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;

	    /* 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 */
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	    vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
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	    if (!vc)
		return -ENOMEM;
	    vc_cons[currcons].d = vc;
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	    INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
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	    visual_init(vc, currcons, 1);
	    if (!*vc->vc_uni_pagedir_loc)
		con_set_default_unimap(vc);
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	    if (!vc->vc_kmalloced)
		vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
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	    if (!vc->vc_screenbuf) {
		kfree(vc);
		vc_cons[currcons].d = NULL;
		return -ENOMEM;
	    }
	    vc->vc_kmalloced = 1;
	    vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
	}
	return 0;
}

static inline int resize_screen(struct vc_data *vc, int width, int height)
{
	/* 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);
	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)
int vc_resize(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;
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	unsigned int end;
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	unsigned short *newscreen;

	WARN_CONSOLE_UNLOCKED();

	if (!vc)
		return -ENXIO;

	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;

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	newscreen = kmalloc(new_screen_size, GFP_USER);
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	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);
	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;
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	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;
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			end = old_origin + (old_row_size * new_rows);
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		}
	} else
		/*
		 * Cursor near the top, copy contents from the top of buffer
		 */
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		end = (old_rows > new_rows) ? old_origin +
			(old_row_size * new_rows) :
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			vc->vc_scr_end;
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	update_attr(vc);

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	while (old_origin < end) {
		scr_memcpyw((unsigned short *) new_origin,
			    (unsigned short *) old_origin, rlth);
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		if (rrem)
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			scr_memsetw((void *)(new_origin + rlth),
				    vc->vc_video_erase_char, rrem);
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		old_origin += old_row_size;
		new_origin += new_row_size;
	}
	if (new_scr_end > new_origin)
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		scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
			    new_scr_end - new_origin);
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	if (vc->vc_kmalloced)
		kfree(vc->vc_screenbuf);
	vc->vc_screenbuf = newscreen;
	vc->vc_kmalloced = 1;
	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 (vc->vc_tty) {
		struct winsize ws, *cws = &vc->vc_tty->winsize;

		memset(&ws, 0, sizeof(ws));
		ws.ws_row = vc->vc_rows;
		ws.ws_col = vc->vc_cols;
		ws.ws_ypixel = vc->vc_scan_lines;
		if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
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		    vc->vc_tty->pgrp)
			kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
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		*cws = ws;
	}

	if (CON_IS_VISIBLE(vc))
		update_screen(vc);
	return err;
}

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int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
{
	int rc;

	acquire_console_sem();
	rc = vc_resize(vc, cols, lines);
	release_console_sem();
	return rc;
}
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void vc_deallocate(unsigned int currcons)
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{
	WARN_CONSOLE_UNLOCKED();

	if (vc_cons_allocated(currcons)) {
		struct vc_data *vc = vc_cons[currcons].d;
		vc->vc_sw->con_deinit(vc);
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		put_pid(vc->vt_pid);
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		module_put(vc->vc_sw->owner);
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		if (vc->vc_kmalloced)
			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};

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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);

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/*
 * 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;
}

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;
}

static inline void bs(struct vc_data *vc)
{
	if (vc->vc_x) {
		vc->vc_pos -= 2;
		vc->vc_x--;
		vc->vc_need_wrap = 0;
	}
}

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;
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	vc->vc_italic = 0;
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	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;
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			case 3:
				vc->vc_italic = 1;
				break;
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			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;
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			case 23:
				vc->vc_italic = 0;
				break;
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			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 * HZ;
			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;
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	vc->vc_s_italic         = vc->vc_italic;
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	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;
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	vc->vc_italic		= vc->vc_s_italic;
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	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;
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	vc->vc_utf              = default_utf8;
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	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]	= 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);
		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] = 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];
1955
DEFINE_MUTEX(con_buf_mtx);
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/* is_double_width() is based on the wcwidth() implementation by
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 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
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 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
 */
struct interval {
	uint32_t first;
	uint32_t last;
};

static int bisearch(uint32_t ucs, const struct interval *table, int max)
{
	int min = 0;
	int mid;

	if (ucs < table[0].first || ucs > table[max].last)
		return 0;
	while (max >= min) {
		mid = (min + max) / 2;
		if (ucs > table[mid].last)
			min = mid + 1;
		else if (ucs < table[mid].first)
			max = mid - 1;
		else
			return 1;
	}
	return 0;
}

static int is_double_width(uint32_t ucs)
{
	static const struct interval double_width[] = {
		{ 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
		{ 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
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		{ 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
		{ 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
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	};
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	return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
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}

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/* 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;
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	unsigned char vc_attr;
	uint8_t rescan;
	uint8_t inverse;
	uint8_t width;
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	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;
	}
	release_console_sem();

	orig_buf = buf;
	orig_count = count;

	/* At this point 'buf' is guaranteed to be a kernel buffer
	 * and therefore no access to userspace (and therefore sleeping)
2051
	 * will be needed.  The con_buf_mtx serializes all tty based
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	 * console rendering and vcs write/read operations.  We hold
	 * the console spinlock during the entire write.
	 */

	acquire_console_sem();

	vc = tty->driver_data;
	if (vc == NULL) {
		printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
		release_console_sem();
		goto out;
	}

	himask = vc->vc_hi_font_mask;
	charmask = himask ? 0x1ff : 0xff;

	/* undraw cursor first */
	if (IS_FG(vc))
		hide_cursor(vc);

	while (!tty->stopped && count) {
		int orig = *buf;
		c = orig;
		buf++;
		n++;
		count--;
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		rescan = 0;
		inverse = 0;
		width = 1;
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		/* Do no translation at all in control states */
		if (vc->vc_state != ESnormal) {
			tc = c;
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		} else if (vc->vc_utf && !vc->vc_disp_ctrl) {
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		    /* 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
		     */
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rescan_last_byte:
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		    if ((c & 0xc0) == 0x80) {
			/* Continuation byte received */
			static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
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			if (vc->vc_utf_count) {
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			    vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
			    vc->vc_npar++;
			    if (--vc->vc_utf_count) {
				/* Still need some bytes */
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				continue;
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			    }
			    /* 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;
			}
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		    } else {
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			/* 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 */
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		    }
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		    /* 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;
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		} else {	/* no utf or alternate charset mode */
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		    tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
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		}

                /* 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 ||
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			    !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
				  vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
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			&& (c != 127 || vc->vc_disp_ctrl)
			&& (c != 128+27);

		if (vc->vc_state == ESnormal && ok) {
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			if (vc->vc_utf && !vc->vc_disp_ctrl) {
				if (is_double_width(c))
					width = 2;
			}
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			/* Now try to find out how to display it */
			tc = conv_uni_to_pc(vc, tc);
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			if (tc & ~charmask) {
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				if (tc == -1 || tc == -2) {
				    continue; /* nothing to display */
				}
				/* Glyph not found */
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				if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
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				    /* In legacy mode use the glyph we get by a 1:1 mapping.
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				       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. */
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				    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 = '?';
				    }
				}
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			}
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			if (!inverse) {
				vc_attr = vc->vc_attr;
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			} else {
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				/* 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);
				}
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				FLUSH
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			}
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			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);
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				}
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				if (!--width) break;

				tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
				if (tc < 0) tc = ' ';
			}

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			if (inverse) {
				FLUSH
			}

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			if (rescan) {
				rescan = 0;
				inverse = 0;
				width = 1;
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				c = orig;
				goto rescan_last_byte;
			}
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			continue;
		}
		FLUSH
		do_con_trol(tty, vc, orig);
	}
	FLUSH
	console_conditional_schedule();
	release_console_sem();

out:
	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.
 */
2285
static void console_callback(struct work_struct *ignored)
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{
	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;
	}

	release_console_sem();
}

2319
int set_console(int nr)
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{
2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336
	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;
	}

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	want_console = nr;
	schedule_console_callback();
2339 2340

	return 0;
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}

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 unsigned long printing;
	const ushort *start;
	ushort cnt = 0;
	ushort myx;

	/* console busy or not yet initialized */
	if (!printable || test_and_set_bit(0, &printing))
		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);
		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);

quit:
	clear_bit(0, &printing);
}

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 (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
		return -EINVAL;
	if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (get_user(type, p))
		return -EFAULT;
	ret = 0;
	switch (type)
	{
		case TIOCL_SETSEL:
			acquire_console_sem();
			ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
			release_console_sem();
			break;
		case TIOCL_PASTESEL:
			ret = paste_selection(tty);
			break;
		case TIOCL_UNBLANKSCREEN:
2495
			acquire_console_sem();
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			unblank_screen();
2497
			release_console_sem();
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			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:
2518
			ret = set_vesa_blanking(p);
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			break;
2520 2521 2522 2523
		case TIOCL_GETKMSGREDIRECT:
			data = kmsg_redirect;
			ret = __put_user(data, p);
			break;
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		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 */
2546
			acquire_console_sem();
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			ignore_poke = 1;
			do_blank_screen(0);
2549
			release_console_sem();
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			break;
		case TIOCL_BLANKEDSCREEN:
			ret = console_blanked;
			break;
		default:
			ret = -EINVAL;
			break;
	}
	return ret;
}

/*
 * /dev/ttyN handling
 */

static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
	int	retval;

	retval = do_con_write(tty, buf, count);
	con_flush_chars(tty);

	return retval;
}

static void con_put_char(struct tty_struct *tty, unsigned char ch)
{
	if (in_interrupt())
		return;	/* n_r3964 calls put_char() from interrupt context */
	do_con_write(tty, &ch, 1);
}

static int con_write_room(struct tty_struct *tty)
{
	if (tty->stopped)
		return 0;
	return 4096;		/* 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();
2664
	if (tty->driver_data == NULL) {
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		ret = vc_allocate(currcons);
		if (ret == 0) {
			struct vc_data *vc = vc_cons[currcons].d;
			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;
			}
			release_console_sem();
2676
			vcs_make_sysfs(tty);
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			return ret;
		}
	}
	release_console_sem();
	return ret;
}

/*
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Ingo Molnar 已提交
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 * We take tty_mutex in here to prevent another thread from coming in via init_dev
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 * and taking a ref against the tty while we're in the process of forgetting
 * about it and cleaning things up.
 *
2689
 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
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 */
static void con_close(struct tty_struct *tty, struct file *filp)
{
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	mutex_lock(&tty_mutex);
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	acquire_console_sem();
	if (tty && tty->count == 1) {
		struct vc_data *vc = tty->driver_data;

		if (vc)
			vc->vc_tty = NULL;
		tty->driver_data = NULL;
		release_console_sem();
2702
		vcs_remove_sysfs(tty);
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		mutex_unlock(&tty_mutex);
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		/*
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		 * tty_mutex is released, but we still hold BKL, so there is
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		 * still exclusion against init_dev()
		 */
		return;
	}
	release_console_sem();
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	mutex_unlock(&tty_mutex);
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}

2714 2715 2716 2717 2718
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);

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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 */
2738 2739
	vc->vc_ulcolor         = default_underline_color;
	vc->vc_itcolor         = default_italic_color;
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	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;
2755
	unsigned int currcons = 0, i;
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	acquire_console_sem();

	if (conswitchp)
		display_desc = conswitchp->con_startup();
	if (!display_desc) {
		fg_console = 0;
		release_console_sem();
		return 0;
	}

2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782
	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;

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	if (blankinterval) {
		blank_state = blank_normal_wait;
		mod_timer(&console_timer, jiffies + blankinterval);
	}

	/*
	 * kmalloc is not running yet - we use the bootmem allocator.
	 */
	for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
		vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2793
		INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
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		visual_init(vc, currcons, 1);
		vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
		vc->vc_kmalloced = 0;
		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);

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static const struct tty_operations con_ops = {
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	.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,
};

int __init vty_init(void)
{
	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;
	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
2868 2869 2870 2871
#include <linux/device.h>

static struct class *vtconsole_class;

2872
int bind_con_driver(const struct consw *csw, int first, int last, int deflt)
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{
2874 2875 2876 2877
	struct module *owner = csw->owner;
	const char *desc = NULL;
	struct con_driver *con_driver;
	int i, j = -1, k = -1, retval = -ENODEV;
L
Linus Torvalds 已提交
2878 2879 2880 2881

	if (!try_module_get(owner))
		return -ENODEV;

2882 2883
	acquire_console_sem();

2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900
	/* 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;
L
Linus Torvalds 已提交
2901
	}
2902

L
Linus Torvalds 已提交
2903 2904 2905
	if (deflt) {
		if (conswitchp)
			module_put(conswitchp->owner);
2906

L
Linus Torvalds 已提交
2907 2908 2909 2910
		__module_get(owner);
		conswitchp = csw;
	}

2911 2912 2913
	first = max(first, con_driver->first);
	last = min(last, con_driver->last);

L
Linus Torvalds 已提交
2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
	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;
2927

2928 2929
		if (CON_IS_VISIBLE(vc)) {
			k = i;
L
Linus Torvalds 已提交
2930
			save_screen(vc);
2931 2932
		}

L
Linus Torvalds 已提交
2933 2934 2935 2936
		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);
2937
		set_origin(vc);
L
Linus Torvalds 已提交
2938 2939 2940 2941 2942 2943 2944 2945 2946
		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);
	}
2947

L
Linus Torvalds 已提交
2948 2949 2950
	printk("Console: switching ");
	if (!deflt)
		printk("consoles %d-%d ", first+1, last+1);
2951 2952 2953
	if (j >= 0) {
		struct vc_data *vc = vc_cons[j].d;

L
Linus Torvalds 已提交
2954
		printk("to %s %s %dx%d\n",
2955 2956 2957 2958 2959 2960 2961 2962
		       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
L
Linus Torvalds 已提交
2963 2964
		printk("to %s\n", desc);

2965 2966
	retval = 0;
err:
L
Linus Torvalds 已提交
2967 2968
	release_console_sem();
	module_put(owner);
2969 2970
	return retval;
};
2971
EXPORT_SYMBOL(bind_con_driver);
L
Linus Torvalds 已提交
2972

2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989
#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;
}

2990
int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
L
Linus Torvalds 已提交
2991
{
2992 2993 2994 2995
	struct module *owner = csw->owner;
	const struct consw *defcsw = NULL;
	struct con_driver *con_driver = NULL, *con_back = NULL;
	int i, retval = -ENODEV;
L
Linus Torvalds 已提交
2996

2997 2998 2999 3000 3001 3002 3003 3004 3005 3006
	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 &&
3007
		    con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3008 3009 3010 3011 3012 3013 3014 3015 3016 3017
			retval = 0;
			break;
		}
	}

	if (retval) {
		release_console_sem();
		goto err;
	}

3018 3019
	retval = -ENODEV;

3020 3021 3022 3023 3024
	/* check if backup driver exists */
	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
		con_back = &registered_con_driver[i];

		if (con_back->con &&
3025
		    !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045
			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++) {
L
Linus Torvalds 已提交
3046 3047 3048 3049
		if (con_driver_map[i] == csw) {
			module_put(csw->owner);
			con_driver_map[i] = NULL;
		}
3050 3051 3052
	}

	if (!con_is_bound(defcsw)) {
3053 3054
		const struct consw *defconsw = conswitchp;

3055 3056
		defcsw->con_startup();
		con_back->flag |= CON_DRIVER_FLAG_INIT;
3057 3058 3059 3060 3061
		/*
		 * vgacon may change the default driver to point
		 * to dummycon, we restore it here...
		 */
		conswitchp = defconsw;
3062 3063 3064 3065 3066 3067
	}

	if (!con_is_bound(csw))
		con_driver->flag &= ~CON_DRIVER_FLAG_INIT;

	release_console_sem();
3068 3069
	/* ignore return value, binding should not fail */
	bind_con_driver(defcsw, first, last, deflt);
3070 3071 3072 3073 3074
err:
	module_put(owner);
	return retval;

}
3075
EXPORT_SYMBOL(unbind_con_driver);
3076

3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165
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;
}
3166 3167 3168 3169 3170 3171 3172 3173 3174 3175
#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 */
3176

3177
static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3178 3179
			  const char *buf, size_t count)
{
3180
	struct con_driver *con = dev_get_drvdata(dev);
3181 3182 3183 3184 3185 3186 3187 3188 3189 3190
	int bind = simple_strtoul(buf, NULL, 0);

	if (bind)
		vt_bind(con);
	else
		vt_unbind(con);

	return count;
}

3191 3192
static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
			 char *buf)
3193
{
3194
	struct con_driver *con = dev_get_drvdata(dev);
3195 3196 3197 3198 3199
	int bind = con_is_bound(con->con);

	return snprintf(buf, PAGE_SIZE, "%i\n", bind);
}

3200 3201
static ssize_t show_name(struct device *dev, struct device_attribute *attr,
			 char *buf)
3202
{
3203
	struct con_driver *con = dev_get_drvdata(dev);
3204 3205 3206 3207 3208 3209 3210

	return snprintf(buf, PAGE_SIZE, "%s %s\n",
			(con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
			 con->desc);

}

3211
static struct device_attribute device_attrs[] = {
3212 3213 3214 3215
	__ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
	__ATTR(name, S_IRUGO, show_name, NULL),
};

3216
static int vtconsole_init_device(struct con_driver *con)
3217 3218
{
	int i;
3219
	int error = 0;
3220

3221
	con->flag |= CON_DRIVER_FLAG_ATTR;
3222 3223 3224
	dev_set_drvdata(con->dev, con);
	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
		error = device_create_file(con->dev, &device_attrs[i]);
3225 3226 3227
		if (error)
			break;
	}
3228

3229 3230
	if (error) {
		while (--i >= 0)
3231
			device_remove_file(con->dev, &device_attrs[i]);
3232 3233 3234 3235
		con->flag &= ~CON_DRIVER_FLAG_ATTR;
	}

	return error;
3236 3237
}

3238
static void vtconsole_deinit_device(struct con_driver *con)
3239 3240 3241
{
	int i;

3242
	if (con->flag & CON_DRIVER_FLAG_ATTR) {
3243 3244
		for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
			device_remove_file(con->dev, &device_attrs[i]);
3245 3246
		con->flag &= ~CON_DRIVER_FLAG_ATTR;
	}
3247 3248
}

3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318
/**
 * 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;
3319 3320
			con_driver->node = i;
			con_driver->flag = CON_DRIVER_FLAG_MODULE |
3321 3322 3323 3324 3325 3326 3327 3328
			                   CON_DRIVER_FLAG_INIT;
			con_driver->first = first;
			con_driver->last = last;
			retval = 0;
			break;
		}
	}

3329 3330 3331
	if (retval)
		goto err;

3332 3333 3334
	con_driver->dev = device_create(vtconsole_class, NULL,
					MKDEV(0, con_driver->node),
					"vtcon%i", con_driver->node);
3335

3336 3337
	if (IS_ERR(con_driver->dev)) {
		printk(KERN_WARNING "Unable to create device for %s; "
3338
		       "errno = %ld\n", con_driver->desc,
3339 3340
		       PTR_ERR(con_driver->dev));
		con_driver->dev = NULL;
3341
	} else {
3342
		vtconsole_init_device(con_driver);
3343
	}
3344

3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376
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 &&
3377
		    con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3378 3379 3380
			vtconsole_deinit_device(con_driver);
			device_destroy(vtconsole_class,
				       MKDEV(0, con_driver->node));
3381 3382
			con_driver->con = NULL;
			con_driver->desc = NULL;
3383
			con_driver->dev = NULL;
3384
			con_driver->node = 0;
3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411
			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)
3412
		bind_con_driver(csw, first, last, deflt);
3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425

	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);
}

3426
static int __init vtconsole_class_init(void)
3427
{
3428
	int i;
3429

3430 3431 3432 3433 3434 3435
	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;
	}
3436

3437
	/* Add system drivers to sysfs */
3438 3439 3440
	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
		struct con_driver *con = &registered_con_driver[i];

3441 3442 3443 3444
		if (con->con && !con->dev) {
			con->dev = device_create(vtconsole_class, NULL,
						 MKDEV(0, con->node),
						 "vtcon%i", con->node);
3445

3446
			if (IS_ERR(con->dev)) {
3447
				printk(KERN_WARNING "Unable to create "
3448 3449 3450
				       "device for %s; errno = %ld\n",
				       con->desc, PTR_ERR(con->dev));
				con->dev = NULL;
3451
			} else {
3452
				vtconsole_init_device(con);
3453
			}
3454 3455 3456 3457 3458
		}
	}

	return 0;
}
3459
postcore_initcall(vtconsole_class_init);
3460

L
Linus Torvalds 已提交
3461 3462 3463 3464 3465 3466
#endif

/*
 *	Screen blanking
 */

3467
static int set_vesa_blanking(char __user *p)
L
Linus Torvalds 已提交
3468
{
3469 3470 3471 3472 3473 3474 3475
	unsigned int mode;

	if (get_user(mode, p + 1))
		return -EFAULT;

	vesa_blank_mode = (mode < 4) ? mode : 0;
	return 0;
L
Linus Torvalds 已提交
3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487
}

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;
V
Ville Syrjala 已提交
3488
			vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
L
Linus Torvalds 已提交
3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517
		}
		return;
	}
	if (blank_state != blank_normal_wait)
		return;
	blank_state = blank_off;

	/* 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;
		set_origin(vc);
		return;
	}

	/* 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 */
V
Ville Syrjala 已提交
3518
	i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
L
Linus Torvalds 已提交
3519 3520 3521 3522 3523 3524 3525
	console_blanked = fg_console + 1;
	if (i)
		set_origin(vc);

	if (console_blank_hook && console_blank_hook(1))
		return;

V
Ville Syrjala 已提交
3526
	if (vesa_off_interval && vesa_blank_mode) {
N
Nishanth Aravamudan 已提交
3527
		blank_state = blank_vesa_wait;
L
Linus Torvalds 已提交
3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588
		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);
		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);
}

/*
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Ingo Molnar 已提交
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 * We defer the timer blanking to work queue so it can take the console mutex
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 * (console operations can still happen at irq time, but only from printk which
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Ingo Molnar 已提交
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 * has the console mutex. Not perfect yet, but better than no locking
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 */
static void blank_screen_t(unsigned long dummy)
{
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Jan Beulich 已提交
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	if (unlikely(!keventd_up())) {
		mod_timer(&console_timer, jiffies + blankinterval);
		return;
	}
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	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);
		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;
}

/* 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)
{
3933
	hide_cursor(vc);
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	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);
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Alan Cox 已提交
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EXPORT_SYMBOL(vc_lock_resize);
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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