2 * linux/drivers/char/vt.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
8 * Hopefully this will be a rather complete VT102 implementation.
10 * Beeping thanks to John T Kohl.
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
38 * Original m68k console driver modifications by
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/smp_lock.h>
93 #include <linux/tiocl.h>
94 #include <linux/kbd_kern.h>
95 #include <linux/consolemap.h>
96 #include <linux/timer.h>
97 #include <linux/interrupt.h>
98 #include <linux/workqueue.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103 #include <linux/device.h>
104 #include <linux/io.h>
105 #include <asm/system.h>
106 #include <linux/uaccess.h>
107 #include <linux/kdb.h>
108 #include <linux/ctype.h>
110 #define MAX_NR_CON_DRIVER 16
112 #define CON_DRIVER_FLAG_MODULE 1
113 #define CON_DRIVER_FLAG_INIT 2
114 #define CON_DRIVER_FLAG_ATTR 4
117 const struct consw
*con
;
126 static struct con_driver registered_con_driver
[MAX_NR_CON_DRIVER
];
127 const struct consw
*conswitchp
;
129 /* A bitmap for codes <32. A bit of 1 indicates that the code
130 * corresponding to that bit number invokes some special action
131 * (such as cursor movement) and should not be displayed as a
132 * glyph unless the disp_ctrl mode is explicitly enabled.
134 #define CTRL_ACTION 0x0d00ff81
135 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
138 * Here is the default bell parameters: 750HZ, 1/8th of a second
140 #define DEFAULT_BELL_PITCH 750
141 #define DEFAULT_BELL_DURATION (HZ/8)
143 struct vc vc_cons
[MAX_NR_CONSOLES
];
145 #ifndef VT_SINGLE_DRIVER
146 static const struct consw
*con_driver_map
[MAX_NR_CONSOLES
];
149 static int con_open(struct tty_struct
*, struct file
*);
150 static void vc_init(struct vc_data
*vc
, unsigned int rows
,
151 unsigned int cols
, int do_clear
);
152 static void gotoxy(struct vc_data
*vc
, int new_x
, int new_y
);
153 static void save_cur(struct vc_data
*vc
);
154 static void reset_terminal(struct vc_data
*vc
, int do_clear
);
155 static void con_flush_chars(struct tty_struct
*tty
);
156 static int set_vesa_blanking(char __user
*p
);
157 static void set_cursor(struct vc_data
*vc
);
158 static void hide_cursor(struct vc_data
*vc
);
159 static void console_callback(struct work_struct
*ignored
);
160 static void blank_screen_t(unsigned long dummy
);
161 static void set_palette(struct vc_data
*vc
);
163 static int printable
; /* Is console ready for printing? */
164 int default_utf8
= true;
165 module_param(default_utf8
, int, S_IRUGO
| S_IWUSR
);
166 int global_cursor_default
= -1;
167 module_param(global_cursor_default
, int, S_IRUGO
| S_IWUSR
);
169 static int cur_default
= CUR_DEFAULT
;
170 module_param(cur_default
, int, S_IRUGO
| S_IWUSR
);
173 * ignore_poke: don't unblank the screen when things are typed. This is
174 * mainly for the privacy of braille terminal users.
176 static int ignore_poke
;
178 int do_poke_blanked_console
;
181 static int vesa_blank_mode
; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
182 static int vesa_off_interval
;
183 static int blankinterval
= 10*60;
184 core_param(consoleblank
, blankinterval
, int, 0444);
186 static DECLARE_WORK(console_work
, console_callback
);
189 * fg_console is the current virtual console,
190 * last_console is the last used one,
191 * want_console is the console we want to switch to,
192 * saved_* variants are for save/restore around kernel debugger enter/leave
196 int want_console
= -1;
197 static int saved_fg_console
;
198 static int saved_last_console
;
199 static int saved_want_console
;
200 static int saved_vc_mode
;
201 static int saved_console_blanked
;
204 * For each existing display, we have a pointer to console currently visible
205 * on that display, allowing consoles other than fg_console to be refreshed
206 * appropriately. Unless the low-level driver supplies its own display_fg
207 * variable, we use this one for the "master display".
209 static struct vc_data
*master_display_fg
;
212 * Unfortunately, we need to delay tty echo when we're currently writing to the
213 * console since the code is (and always was) not re-entrant, so we schedule
214 * all flip requests to process context with schedule-task() and run it from
215 * console_callback().
219 * For the same reason, we defer scrollback to the console callback.
221 static int scrollback_delta
;
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
227 int (*console_blank_hook
)(int);
229 static DEFINE_TIMER(console_timer
, blank_screen_t
, 0, 0);
230 static int blank_state
;
231 static int blank_timer_expired
;
239 * /sys/class/tty/tty0/
241 * the attribute 'active' contains the name of the current vc
242 * console and it supports poll() to detect vc switches
244 static struct device
*tty0dev
;
247 * Notifier list for console events.
249 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list
);
251 int register_vt_notifier(struct notifier_block
*nb
)
253 return atomic_notifier_chain_register(&vt_notifier_list
, nb
);
255 EXPORT_SYMBOL_GPL(register_vt_notifier
);
257 int unregister_vt_notifier(struct notifier_block
*nb
)
259 return atomic_notifier_chain_unregister(&vt_notifier_list
, nb
);
261 EXPORT_SYMBOL_GPL(unregister_vt_notifier
);
263 static void notify_write(struct vc_data
*vc
, unsigned int unicode
)
265 struct vt_notifier_param param
= { .vc
= vc
, unicode
= unicode
};
266 atomic_notifier_call_chain(&vt_notifier_list
, VT_WRITE
, ¶m
);
269 static void notify_update(struct vc_data
*vc
)
271 struct vt_notifier_param param
= { .vc
= vc
};
272 atomic_notifier_call_chain(&vt_notifier_list
, VT_UPDATE
, ¶m
);
275 * Low-Level Functions
278 #define IS_FG(vc) ((vc)->vc_num == fg_console)
280 #ifdef VT_BUF_VRAM_ONLY
281 #define DO_UPDATE(vc) 0
283 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
286 static inline unsigned short *screenpos(struct vc_data
*vc
, int offset
, int viewed
)
291 p
= (unsigned short *)(vc
->vc_origin
+ offset
);
292 else if (!vc
->vc_sw
->con_screen_pos
)
293 p
= (unsigned short *)(vc
->vc_visible_origin
+ offset
);
295 p
= vc
->vc_sw
->con_screen_pos(vc
, offset
);
299 /* Called from the keyboard irq path.. */
300 static inline void scrolldelta(int lines
)
303 /* scrolldelta needs some kind of consistency lock, but the BKL was
304 and still is not protecting versus the scheduled back end */
305 scrollback_delta
+= lines
;
306 schedule_console_callback();
309 void schedule_console_callback(void)
311 schedule_work(&console_work
);
314 static void scrup(struct vc_data
*vc
, unsigned int t
, unsigned int b
, int nr
)
316 unsigned short *d
, *s
;
320 if (b
> vc
->vc_rows
|| t
>= b
|| nr
< 1)
322 if (CON_IS_VISIBLE(vc
) && vc
->vc_sw
->con_scroll(vc
, t
, b
, SM_UP
, nr
))
324 d
= (unsigned short *)(vc
->vc_origin
+ vc
->vc_size_row
* t
);
325 s
= (unsigned short *)(vc
->vc_origin
+ vc
->vc_size_row
* (t
+ nr
));
326 scr_memmovew(d
, s
, (b
- t
- nr
) * vc
->vc_size_row
);
327 scr_memsetw(d
+ (b
- t
- nr
) * vc
->vc_cols
, vc
->vc_video_erase_char
,
328 vc
->vc_size_row
* nr
);
331 static void scrdown(struct vc_data
*vc
, unsigned int t
, unsigned int b
, int nr
)
338 if (b
> vc
->vc_rows
|| t
>= b
|| nr
< 1)
340 if (CON_IS_VISIBLE(vc
) && vc
->vc_sw
->con_scroll(vc
, t
, b
, SM_DOWN
, nr
))
342 s
= (unsigned short *)(vc
->vc_origin
+ vc
->vc_size_row
* t
);
343 step
= vc
->vc_cols
* nr
;
344 scr_memmovew(s
+ step
, s
, (b
- t
- nr
) * vc
->vc_size_row
);
345 scr_memsetw(s
, vc
->vc_video_erase_char
, 2 * step
);
348 static void do_update_region(struct vc_data
*vc
, unsigned long start
, int count
)
350 #ifndef VT_BUF_VRAM_ONLY
351 unsigned int xx
, yy
, offset
;
355 if (!vc
->vc_sw
->con_getxy
) {
356 offset
= (start
- vc
->vc_origin
) / 2;
357 xx
= offset
% vc
->vc_cols
;
358 yy
= offset
/ vc
->vc_cols
;
361 start
= vc
->vc_sw
->con_getxy(vc
, start
, &nxx
, &nyy
);
365 u16 attrib
= scr_readw(p
) & 0xff00;
368 while (xx
< vc
->vc_cols
&& count
) {
369 if (attrib
!= (scr_readw(p
) & 0xff00)) {
371 vc
->vc_sw
->con_putcs(vc
, q
, p
-q
, yy
, startx
);
374 attrib
= scr_readw(p
) & 0xff00;
381 vc
->vc_sw
->con_putcs(vc
, q
, p
-q
, yy
, startx
);
386 if (vc
->vc_sw
->con_getxy
) {
388 start
= vc
->vc_sw
->con_getxy(vc
, start
, NULL
, NULL
);
394 void update_region(struct vc_data
*vc
, unsigned long start
, int count
)
396 WARN_CONSOLE_UNLOCKED();
400 do_update_region(vc
, start
, count
);
405 /* Structure of attributes is hardware-dependent */
407 static u8
build_attr(struct vc_data
*vc
, u8 _color
, u8 _intensity
, u8 _blink
,
408 u8 _underline
, u8 _reverse
, u8 _italic
)
410 if (vc
->vc_sw
->con_build_attr
)
411 return vc
->vc_sw
->con_build_attr(vc
, _color
, _intensity
,
412 _blink
, _underline
, _reverse
, _italic
);
414 #ifndef VT_BUF_VRAM_ONLY
416 * ++roman: I completely changed the attribute format for monochrome
417 * mode (!can_do_color). The formerly used MDA (monochrome display
418 * adapter) format didn't allow the combination of certain effects.
419 * Now the attribute is just a bit vector:
420 * Bit 0..1: intensity (0..2)
427 if (!vc
->vc_can_do_color
)
430 (_underline
? 4 : 0) |
434 a
= (a
& 0xF0) | vc
->vc_itcolor
;
436 a
= (a
& 0xf0) | vc
->vc_ulcolor
;
437 else if (_intensity
== 0)
438 a
= (a
& 0xf0) | vc
->vc_ulcolor
;
440 a
= ((a
) & 0x88) | ((((a
) >> 4) | ((a
) << 4)) & 0x77);
445 if (vc
->vc_hi_font_mask
== 0x100)
454 static void update_attr(struct vc_data
*vc
)
456 vc
->vc_attr
= build_attr(vc
, vc
->vc_color
, vc
->vc_intensity
,
457 vc
->vc_blink
, vc
->vc_underline
,
458 vc
->vc_reverse
^ vc
->vc_decscnm
, vc
->vc_italic
);
459 vc
->vc_video_erase_char
= (build_attr(vc
, vc
->vc_color
, 1, vc
->vc_blink
, 0, vc
->vc_decscnm
, 0) << 8) | ' ';
462 /* Note: inverting the screen twice should revert to the original state */
463 void invert_screen(struct vc_data
*vc
, int offset
, int count
, int viewed
)
467 WARN_CONSOLE_UNLOCKED();
470 p
= screenpos(vc
, offset
, viewed
);
471 if (vc
->vc_sw
->con_invert_region
)
472 vc
->vc_sw
->con_invert_region(vc
, p
, count
);
473 #ifndef VT_BUF_VRAM_ONLY
479 if (!vc
->vc_can_do_color
) {
486 } else if (vc
->vc_hi_font_mask
== 0x100) {
489 a
= ((a
) & 0x11ff) | (((a
) & 0xe000) >> 4) | (((a
) & 0x0e00) << 4);
496 a
= ((a
) & 0x88ff) | (((a
) & 0x7000) >> 4) | (((a
) & 0x0700) << 4);
504 do_update_region(vc
, (unsigned long) p
, count
);
507 /* used by selection: complement pointer position */
508 void complement_pos(struct vc_data
*vc
, int offset
)
510 static int old_offset
= -1;
511 static unsigned short old
;
512 static unsigned short oldx
, oldy
;
514 WARN_CONSOLE_UNLOCKED();
516 if (old_offset
!= -1 && old_offset
>= 0 &&
517 old_offset
< vc
->vc_screenbuf_size
) {
518 scr_writew(old
, screenpos(vc
, old_offset
, 1));
520 vc
->vc_sw
->con_putc(vc
, old
, oldy
, oldx
);
525 if (offset
!= -1 && offset
>= 0 &&
526 offset
< vc
->vc_screenbuf_size
) {
529 p
= screenpos(vc
, offset
, 1);
531 new = old
^ vc
->vc_complement_mask
;
534 oldx
= (offset
>> 1) % vc
->vc_cols
;
535 oldy
= (offset
>> 1) / vc
->vc_cols
;
536 vc
->vc_sw
->con_putc(vc
, new, oldy
, oldx
);
542 static void insert_char(struct vc_data
*vc
, unsigned int nr
)
544 unsigned short *p
, *q
= (unsigned short *)vc
->vc_pos
;
546 p
= q
+ vc
->vc_cols
- nr
- vc
->vc_x
;
548 scr_writew(scr_readw(p
), p
+ nr
);
549 scr_memsetw(q
, vc
->vc_video_erase_char
, nr
* 2);
550 vc
->vc_need_wrap
= 0;
552 unsigned short oldattr
= vc
->vc_attr
;
553 vc
->vc_sw
->con_bmove(vc
, vc
->vc_y
, vc
->vc_x
, vc
->vc_y
, vc
->vc_x
+ nr
, 1,
554 vc
->vc_cols
- vc
->vc_x
- nr
);
555 vc
->vc_attr
= vc
->vc_video_erase_char
>> 8;
557 vc
->vc_sw
->con_putc(vc
, vc
->vc_video_erase_char
, vc
->vc_y
, vc
->vc_x
+ nr
);
558 vc
->vc_attr
= oldattr
;
562 static void delete_char(struct vc_data
*vc
, unsigned int nr
)
564 unsigned int i
= vc
->vc_x
;
565 unsigned short *p
= (unsigned short *)vc
->vc_pos
;
567 while (++i
<= vc
->vc_cols
- nr
) {
568 scr_writew(scr_readw(p
+nr
), p
);
571 scr_memsetw(p
, vc
->vc_video_erase_char
, nr
* 2);
572 vc
->vc_need_wrap
= 0;
574 unsigned short oldattr
= vc
->vc_attr
;
575 vc
->vc_sw
->con_bmove(vc
, vc
->vc_y
, vc
->vc_x
+ nr
, vc
->vc_y
, vc
->vc_x
, 1,
576 vc
->vc_cols
- vc
->vc_x
- nr
);
577 vc
->vc_attr
= vc
->vc_video_erase_char
>> 8;
579 vc
->vc_sw
->con_putc(vc
, vc
->vc_video_erase_char
, vc
->vc_y
,
580 vc
->vc_cols
- 1 - nr
);
581 vc
->vc_attr
= oldattr
;
585 static int softcursor_original
;
587 static void add_softcursor(struct vc_data
*vc
)
589 int i
= scr_readw((u16
*) vc
->vc_pos
);
590 u32 type
= vc
->vc_cursor_type
;
592 if (! (type
& 0x10)) return;
593 if (softcursor_original
!= -1) return;
594 softcursor_original
= i
;
595 i
|= ((type
>> 8) & 0xff00 );
596 i
^= ((type
) & 0xff00 );
597 if ((type
& 0x20) && ((softcursor_original
& 0x7000) == (i
& 0x7000))) i
^= 0x7000;
598 if ((type
& 0x40) && ((i
& 0x700) == ((i
& 0x7000) >> 4))) i
^= 0x0700;
599 scr_writew(i
, (u16
*) vc
->vc_pos
);
601 vc
->vc_sw
->con_putc(vc
, i
, vc
->vc_y
, vc
->vc_x
);
604 static void hide_softcursor(struct vc_data
*vc
)
606 if (softcursor_original
!= -1) {
607 scr_writew(softcursor_original
, (u16
*)vc
->vc_pos
);
609 vc
->vc_sw
->con_putc(vc
, softcursor_original
,
611 softcursor_original
= -1;
615 static void hide_cursor(struct vc_data
*vc
)
619 vc
->vc_sw
->con_cursor(vc
, CM_ERASE
);
623 static void set_cursor(struct vc_data
*vc
)
625 if (!IS_FG(vc
) || console_blanked
||
626 vc
->vc_mode
== KD_GRAPHICS
)
632 if ((vc
->vc_cursor_type
& 0x0f) != 1)
633 vc
->vc_sw
->con_cursor(vc
, CM_DRAW
);
638 static void set_origin(struct vc_data
*vc
)
640 WARN_CONSOLE_UNLOCKED();
642 if (!CON_IS_VISIBLE(vc
) ||
643 !vc
->vc_sw
->con_set_origin
||
644 !vc
->vc_sw
->con_set_origin(vc
))
645 vc
->vc_origin
= (unsigned long)vc
->vc_screenbuf
;
646 vc
->vc_visible_origin
= vc
->vc_origin
;
647 vc
->vc_scr_end
= vc
->vc_origin
+ vc
->vc_screenbuf_size
;
648 vc
->vc_pos
= vc
->vc_origin
+ vc
->vc_size_row
* vc
->vc_y
+ 2 * vc
->vc_x
;
651 static inline void save_screen(struct vc_data
*vc
)
653 WARN_CONSOLE_UNLOCKED();
655 if (vc
->vc_sw
->con_save_screen
)
656 vc
->vc_sw
->con_save_screen(vc
);
660 * Redrawing of screen
663 static void clear_buffer_attributes(struct vc_data
*vc
)
665 unsigned short *p
= (unsigned short *)vc
->vc_origin
;
666 int count
= vc
->vc_screenbuf_size
/ 2;
667 int mask
= vc
->vc_hi_font_mask
| 0xff;
669 for (; count
> 0; count
--, p
++) {
670 scr_writew((scr_readw(p
)&mask
) | (vc
->vc_video_erase_char
& ~mask
), p
);
674 void redraw_screen(struct vc_data
*vc
, int is_switch
)
678 WARN_CONSOLE_UNLOCKED();
682 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
687 struct vc_data
*old_vc
= vc_cons
[fg_console
].d
;
690 if (!CON_IS_VISIBLE(vc
))
692 *vc
->vc_display_fg
= vc
;
693 fg_console
= vc
->vc_num
;
695 if (!CON_IS_VISIBLE(old_vc
)) {
700 sysfs_notify(&tty0dev
->kobj
, NULL
, "active");
708 int old_was_color
= vc
->vc_can_do_color
;
711 update
= vc
->vc_sw
->con_switch(vc
);
714 * If console changed from mono<->color, the best we can do
715 * is to clear the buffer attributes. As it currently stands,
716 * rebuilding new attributes from the old buffer is not doable
717 * without overly complex code.
719 if (old_was_color
!= vc
->vc_can_do_color
) {
721 clear_buffer_attributes(vc
);
724 /* Forcibly update if we're panicing */
725 if ((update
&& vc
->vc_mode
!= KD_GRAPHICS
) ||
726 vt_force_oops_output(vc
))
727 do_update_region(vc
, vc
->vc_origin
, vc
->vc_screenbuf_size
/ 2);
732 compute_shiftstate();
738 * Allocation, freeing and resizing of VTs.
741 int vc_cons_allocated(unsigned int i
)
743 return (i
< MAX_NR_CONSOLES
&& vc_cons
[i
].d
);
746 static void visual_init(struct vc_data
*vc
, int num
, int init
)
748 /* ++Geert: vc->vc_sw->con_init determines console size */
750 module_put(vc
->vc_sw
->owner
);
751 vc
->vc_sw
= conswitchp
;
752 #ifndef VT_SINGLE_DRIVER
753 if (con_driver_map
[num
])
754 vc
->vc_sw
= con_driver_map
[num
];
756 __module_get(vc
->vc_sw
->owner
);
758 vc
->vc_display_fg
= &master_display_fg
;
759 vc
->vc_uni_pagedir_loc
= &vc
->vc_uni_pagedir
;
760 vc
->vc_uni_pagedir
= 0;
761 vc
->vc_hi_font_mask
= 0;
762 vc
->vc_complement_mask
= 0;
763 vc
->vc_can_do_color
= 0;
764 vc
->vc_panic_force_write
= false;
765 vc
->vc_sw
->con_init(vc
, init
);
766 if (!vc
->vc_complement_mask
)
767 vc
->vc_complement_mask
= vc
->vc_can_do_color
? 0x7700 : 0x0800;
768 vc
->vc_s_complement_mask
= vc
->vc_complement_mask
;
769 vc
->vc_size_row
= vc
->vc_cols
<< 1;
770 vc
->vc_screenbuf_size
= vc
->vc_rows
* vc
->vc_size_row
;
773 int vc_allocate(unsigned int currcons
) /* return 0 on success */
775 WARN_CONSOLE_UNLOCKED();
777 if (currcons
>= MAX_NR_CONSOLES
)
779 if (!vc_cons
[currcons
].d
) {
781 struct vt_notifier_param param
;
783 /* prevent users from taking too much memory */
784 if (currcons
>= MAX_NR_USER_CONSOLES
&& !capable(CAP_SYS_RESOURCE
))
787 /* due to the granularity of kmalloc, we waste some memory here */
788 /* the alloc is done in two steps, to optimize the common situation
789 of a 25x80 console (structsize=216, screenbuf_size=4000) */
790 /* although the numbers above are not valid since long ago, the
791 point is still up-to-date and the comment still has its value
792 even if only as a historical artifact. --mj, July 1998 */
793 param
.vc
= vc
= kzalloc(sizeof(struct vc_data
), GFP_KERNEL
);
796 vc_cons
[currcons
].d
= vc
;
797 tty_port_init(&vc
->port
);
798 INIT_WORK(&vc_cons
[currcons
].SAK_work
, vc_SAK
);
799 visual_init(vc
, currcons
, 1);
800 if (!*vc
->vc_uni_pagedir_loc
)
801 con_set_default_unimap(vc
);
802 vc
->vc_screenbuf
= kmalloc(vc
->vc_screenbuf_size
, GFP_KERNEL
);
803 if (!vc
->vc_screenbuf
) {
805 vc_cons
[currcons
].d
= NULL
;
809 /* If no drivers have overridden us and the user didn't pass a
810 boot option, default to displaying the cursor */
811 if (global_cursor_default
== -1)
812 global_cursor_default
= 1;
814 vc_init(vc
, vc
->vc_rows
, vc
->vc_cols
, 1);
815 vcs_make_sysfs(currcons
);
816 atomic_notifier_call_chain(&vt_notifier_list
, VT_ALLOCATE
, ¶m
);
821 static inline int resize_screen(struct vc_data
*vc
, int width
, int height
,
824 /* Resizes the resolution of the display adapater */
827 if (vc
->vc_mode
!= KD_GRAPHICS
&& vc
->vc_sw
->con_resize
)
828 err
= vc
->vc_sw
->con_resize(vc
, width
, height
, user
);
834 * Change # of rows and columns (0 means unchanged/the size of fg_console)
835 * [this is to be used together with some user program
836 * like resize that changes the hardware videomode]
838 #define VC_RESIZE_MAXCOL (32767)
839 #define VC_RESIZE_MAXROW (32767)
842 * vc_do_resize - resizing method for the tty
843 * @tty: tty being resized
844 * @real_tty: real tty (different to tty if a pty/tty pair)
845 * @vc: virtual console private data
849 * Resize a virtual console, clipping according to the actual constraints.
850 * If the caller passes a tty structure then update the termios winsize
851 * information and perform any necessary signal handling.
853 * Caller must hold the console semaphore. Takes the termios mutex and
854 * ctrl_lock of the tty IFF a tty is passed.
857 static int vc_do_resize(struct tty_struct
*tty
, struct vc_data
*vc
,
858 unsigned int cols
, unsigned int lines
)
860 unsigned long old_origin
, new_origin
, new_scr_end
, rlth
, rrem
, err
= 0;
862 unsigned int old_cols
, old_rows
, old_row_size
, old_screen_size
;
863 unsigned int new_cols
, new_rows
, new_row_size
, new_screen_size
;
865 unsigned short *newscreen
;
867 WARN_CONSOLE_UNLOCKED();
872 user
= vc
->vc_resize_user
;
873 vc
->vc_resize_user
= 0;
875 if (cols
> VC_RESIZE_MAXCOL
|| lines
> VC_RESIZE_MAXROW
)
878 new_cols
= (cols
? cols
: vc
->vc_cols
);
879 new_rows
= (lines
? lines
: vc
->vc_rows
);
880 new_row_size
= new_cols
<< 1;
881 new_screen_size
= new_row_size
* new_rows
;
883 if (new_cols
== vc
->vc_cols
&& new_rows
== vc
->vc_rows
)
886 newscreen
= kmalloc(new_screen_size
, GFP_USER
);
890 old_rows
= vc
->vc_rows
;
891 old_cols
= vc
->vc_cols
;
892 old_row_size
= vc
->vc_size_row
;
893 old_screen_size
= vc
->vc_screenbuf_size
;
895 err
= resize_screen(vc
, new_cols
, new_rows
, user
);
901 vc
->vc_rows
= new_rows
;
902 vc
->vc_cols
= new_cols
;
903 vc
->vc_size_row
= new_row_size
;
904 vc
->vc_screenbuf_size
= new_screen_size
;
906 rlth
= min(old_row_size
, new_row_size
);
907 rrem
= new_row_size
- rlth
;
908 old_origin
= vc
->vc_origin
;
909 new_origin
= (long) newscreen
;
910 new_scr_end
= new_origin
+ new_screen_size
;
912 if (vc
->vc_y
> new_rows
) {
913 if (old_rows
- vc
->vc_y
< new_rows
) {
915 * Cursor near the bottom, copy contents from the
918 old_origin
+= (old_rows
- new_rows
) * old_row_size
;
921 * Cursor is in no man's land, copy 1/2 screenful
922 * from the top and bottom of cursor position
924 old_origin
+= (vc
->vc_y
- new_rows
/2) * old_row_size
;
928 end
= old_origin
+ old_row_size
* min(old_rows
, new_rows
);
932 while (old_origin
< end
) {
933 scr_memcpyw((unsigned short *) new_origin
,
934 (unsigned short *) old_origin
, rlth
);
936 scr_memsetw((void *)(new_origin
+ rlth
),
937 vc
->vc_video_erase_char
, rrem
);
938 old_origin
+= old_row_size
;
939 new_origin
+= new_row_size
;
941 if (new_scr_end
> new_origin
)
942 scr_memsetw((void *)new_origin
, vc
->vc_video_erase_char
,
943 new_scr_end
- new_origin
);
944 kfree(vc
->vc_screenbuf
);
945 vc
->vc_screenbuf
= newscreen
;
946 vc
->vc_screenbuf_size
= new_screen_size
;
949 /* do part of a reset_terminal() */
951 vc
->vc_bottom
= vc
->vc_rows
;
952 gotoxy(vc
, vc
->vc_x
, vc
->vc_y
);
956 /* Rewrite the requested winsize data with the actual
959 memset(&ws
, 0, sizeof(ws
));
960 ws
.ws_row
= vc
->vc_rows
;
961 ws
.ws_col
= vc
->vc_cols
;
962 ws
.ws_ypixel
= vc
->vc_scan_lines
;
963 tty_do_resize(tty
, &ws
);
966 if (CON_IS_VISIBLE(vc
))
968 vt_event_post(VT_EVENT_RESIZE
, vc
->vc_num
, vc
->vc_num
);
973 * vc_resize - resize a VT
974 * @vc: virtual console
978 * Resize a virtual console as seen from the console end of things. We
979 * use the common vc_do_resize methods to update the structures. The
980 * caller must hold the console sem to protect console internals and
984 int vc_resize(struct vc_data
*vc
, unsigned int cols
, unsigned int rows
)
986 return vc_do_resize(vc
->port
.tty
, vc
, cols
, rows
);
990 * vt_resize - resize a VT
991 * @tty: tty to resize
992 * @ws: winsize attributes
994 * Resize a virtual terminal. This is called by the tty layer as we
995 * register our own handler for resizing. The mutual helper does all
998 * Takes the console sem and the called methods then take the tty
999 * termios_mutex and the tty ctrl_lock in that order.
1001 static int vt_resize(struct tty_struct
*tty
, struct winsize
*ws
)
1003 struct vc_data
*vc
= tty
->driver_data
;
1006 acquire_console_sem();
1007 ret
= vc_do_resize(tty
, vc
, ws
->ws_col
, ws
->ws_row
);
1008 release_console_sem();
1012 void vc_deallocate(unsigned int currcons
)
1014 WARN_CONSOLE_UNLOCKED();
1016 if (vc_cons_allocated(currcons
)) {
1017 struct vc_data
*vc
= vc_cons
[currcons
].d
;
1018 struct vt_notifier_param param
= { .vc
= vc
};
1020 atomic_notifier_call_chain(&vt_notifier_list
, VT_DEALLOCATE
, ¶m
);
1021 vcs_remove_sysfs(currcons
);
1022 vc
->vc_sw
->con_deinit(vc
);
1023 put_pid(vc
->vt_pid
);
1024 module_put(vc
->vc_sw
->owner
);
1025 kfree(vc
->vc_screenbuf
);
1026 if (currcons
>= MIN_NR_CONSOLES
)
1028 vc_cons
[currcons
].d
= NULL
;
1036 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1037 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1038 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1040 #define decarm VC_REPEAT
1041 #define decckm VC_CKMODE
1042 #define kbdapplic VC_APPLIC
1046 * this is what the terminal answers to a ESC-Z or csi0c query.
1048 #define VT100ID "\033[?1;2c"
1049 #define VT102ID "\033[?6c"
1051 unsigned char color_table
[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1052 8,12,10,14, 9,13,11,15 };
1054 /* the default colour table, for VGA+ colour systems */
1055 int default_red
[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1056 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1057 int default_grn
[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1058 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1059 int default_blu
[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1060 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1062 module_param_array(default_red
, int, NULL
, S_IRUGO
| S_IWUSR
);
1063 module_param_array(default_grn
, int, NULL
, S_IRUGO
| S_IWUSR
);
1064 module_param_array(default_blu
, int, NULL
, S_IRUGO
| S_IWUSR
);
1067 * gotoxy() must verify all boundaries, because the arguments
1068 * might also be negative. If the given position is out of
1069 * bounds, the cursor is placed at the nearest margin.
1071 static void gotoxy(struct vc_data
*vc
, int new_x
, int new_y
)
1078 if (new_x
>= vc
->vc_cols
)
1079 vc
->vc_x
= vc
->vc_cols
- 1;
1086 max_y
= vc
->vc_bottom
;
1089 max_y
= vc
->vc_rows
;
1093 else if (new_y
>= max_y
)
1094 vc
->vc_y
= max_y
- 1;
1097 vc
->vc_pos
= vc
->vc_origin
+ vc
->vc_y
* vc
->vc_size_row
+ (vc
->vc_x
<<1);
1098 vc
->vc_need_wrap
= 0;
1101 /* for absolute user moves, when decom is set */
1102 static void gotoxay(struct vc_data
*vc
, int new_x
, int new_y
)
1104 gotoxy(vc
, new_x
, vc
->vc_decom
? (vc
->vc_top
+ new_y
) : new_y
);
1107 void scrollback(struct vc_data
*vc
, int lines
)
1110 lines
= vc
->vc_rows
/ 2;
1111 scrolldelta(-lines
);
1114 void scrollfront(struct vc_data
*vc
, int lines
)
1117 lines
= vc
->vc_rows
/ 2;
1121 static void lf(struct vc_data
*vc
)
1123 /* don't scroll if above bottom of scrolling region, or
1124 * if below scrolling region
1126 if (vc
->vc_y
+ 1 == vc
->vc_bottom
)
1127 scrup(vc
, vc
->vc_top
, vc
->vc_bottom
, 1);
1128 else if (vc
->vc_y
< vc
->vc_rows
- 1) {
1130 vc
->vc_pos
+= vc
->vc_size_row
;
1132 vc
->vc_need_wrap
= 0;
1133 notify_write(vc
, '\n');
1136 static void ri(struct vc_data
*vc
)
1138 /* don't scroll if below top of scrolling region, or
1139 * if above scrolling region
1141 if (vc
->vc_y
== vc
->vc_top
)
1142 scrdown(vc
, vc
->vc_top
, vc
->vc_bottom
, 1);
1143 else if (vc
->vc_y
> 0) {
1145 vc
->vc_pos
-= vc
->vc_size_row
;
1147 vc
->vc_need_wrap
= 0;
1150 static inline void cr(struct vc_data
*vc
)
1152 vc
->vc_pos
-= vc
->vc_x
<< 1;
1153 vc
->vc_need_wrap
= vc
->vc_x
= 0;
1154 notify_write(vc
, '\r');
1157 static inline void bs(struct vc_data
*vc
)
1162 vc
->vc_need_wrap
= 0;
1163 notify_write(vc
, '\b');
1167 static inline void del(struct vc_data
*vc
)
1172 static void csi_J(struct vc_data
*vc
, int vpar
)
1175 unsigned short * start
;
1178 case 0: /* erase from cursor to end of display */
1179 count
= (vc
->vc_scr_end
- vc
->vc_pos
) >> 1;
1180 start
= (unsigned short *)vc
->vc_pos
;
1181 if (DO_UPDATE(vc
)) {
1182 /* do in two stages */
1183 vc
->vc_sw
->con_clear(vc
, vc
->vc_y
, vc
->vc_x
, 1,
1184 vc
->vc_cols
- vc
->vc_x
);
1185 vc
->vc_sw
->con_clear(vc
, vc
->vc_y
+ 1, 0,
1186 vc
->vc_rows
- vc
->vc_y
- 1,
1190 case 1: /* erase from start to cursor */
1191 count
= ((vc
->vc_pos
- vc
->vc_origin
) >> 1) + 1;
1192 start
= (unsigned short *)vc
->vc_origin
;
1193 if (DO_UPDATE(vc
)) {
1194 /* do in two stages */
1195 vc
->vc_sw
->con_clear(vc
, 0, 0, vc
->vc_y
,
1197 vc
->vc_sw
->con_clear(vc
, vc
->vc_y
, 0, 1,
1201 case 2: /* erase whole display */
1202 count
= vc
->vc_cols
* vc
->vc_rows
;
1203 start
= (unsigned short *)vc
->vc_origin
;
1205 vc
->vc_sw
->con_clear(vc
, 0, 0,
1212 scr_memsetw(start
, vc
->vc_video_erase_char
, 2 * count
);
1213 vc
->vc_need_wrap
= 0;
1216 static void csi_K(struct vc_data
*vc
, int vpar
)
1219 unsigned short * start
;
1222 case 0: /* erase from cursor to end of line */
1223 count
= vc
->vc_cols
- vc
->vc_x
;
1224 start
= (unsigned short *)vc
->vc_pos
;
1226 vc
->vc_sw
->con_clear(vc
, vc
->vc_y
, vc
->vc_x
, 1,
1227 vc
->vc_cols
- vc
->vc_x
);
1229 case 1: /* erase from start of line to cursor */
1230 start
= (unsigned short *)(vc
->vc_pos
- (vc
->vc_x
<< 1));
1231 count
= vc
->vc_x
+ 1;
1233 vc
->vc_sw
->con_clear(vc
, vc
->vc_y
, 0, 1,
1236 case 2: /* erase whole line */
1237 start
= (unsigned short *)(vc
->vc_pos
- (vc
->vc_x
<< 1));
1238 count
= vc
->vc_cols
;
1240 vc
->vc_sw
->con_clear(vc
, vc
->vc_y
, 0, 1,
1246 scr_memsetw(start
, vc
->vc_video_erase_char
, 2 * count
);
1247 vc
->vc_need_wrap
= 0;
1250 static void csi_X(struct vc_data
*vc
, int vpar
) /* erase the following vpar positions */
1256 count
= (vpar
> vc
->vc_cols
- vc
->vc_x
) ? (vc
->vc_cols
- vc
->vc_x
) : vpar
;
1258 scr_memsetw((unsigned short *)vc
->vc_pos
, vc
->vc_video_erase_char
, 2 * count
);
1260 vc
->vc_sw
->con_clear(vc
, vc
->vc_y
, vc
->vc_x
, 1, count
);
1261 vc
->vc_need_wrap
= 0;
1264 static void default_attr(struct vc_data
*vc
)
1266 vc
->vc_intensity
= 1;
1268 vc
->vc_underline
= 0;
1271 vc
->vc_color
= vc
->vc_def_color
;
1274 /* console_sem is held */
1275 static void csi_m(struct vc_data
*vc
)
1279 for (i
= 0; i
<= vc
->vc_npar
; i
++)
1280 switch (vc
->vc_par
[i
]) {
1281 case 0: /* all attributes off */
1285 vc
->vc_intensity
= 2;
1288 vc
->vc_intensity
= 0;
1294 vc
->vc_underline
= 1;
1302 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1303 * Select primary font, don't display
1304 * control chars if defined, don't set
1307 vc
->vc_translate
= set_translate(vc
->vc_charset
== 0
1309 : vc
->vc_G1_charset
, vc
);
1310 vc
->vc_disp_ctrl
= 0;
1311 vc
->vc_toggle_meta
= 0;
1313 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1314 * Select first alternate font, lets
1315 * chars < 32 be displayed as ROM chars.
1317 vc
->vc_translate
= set_translate(IBMPC_MAP
, vc
);
1318 vc
->vc_disp_ctrl
= 1;
1319 vc
->vc_toggle_meta
= 0;
1321 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1322 * Select second alternate font, toggle
1323 * high bit before displaying as ROM char.
1325 vc
->vc_translate
= set_translate(IBMPC_MAP
, vc
);
1326 vc
->vc_disp_ctrl
= 1;
1327 vc
->vc_toggle_meta
= 1;
1331 vc
->vc_intensity
= 1;
1337 vc
->vc_underline
= 0;
1345 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1346 * Enables underscore, white foreground
1347 * with white underscore (Linux - use
1348 * default foreground).
1350 vc
->vc_color
= (vc
->vc_def_color
& 0x0f) | (vc
->vc_color
& 0xf0);
1351 vc
->vc_underline
= 1;
1353 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1354 * Disable underline option.
1355 * Reset colour to default? It did this
1358 vc
->vc_color
= (vc
->vc_def_color
& 0x0f) | (vc
->vc_color
& 0xf0);
1359 vc
->vc_underline
= 0;
1362 vc
->vc_color
= (vc
->vc_def_color
& 0xf0) | (vc
->vc_color
& 0x0f);
1365 if (vc
->vc_par
[i
] >= 30 && vc
->vc_par
[i
] <= 37)
1366 vc
->vc_color
= color_table
[vc
->vc_par
[i
] - 30]
1367 | (vc
->vc_color
& 0xf0);
1368 else if (vc
->vc_par
[i
] >= 40 && vc
->vc_par
[i
] <= 47)
1369 vc
->vc_color
= (color_table
[vc
->vc_par
[i
] - 40] << 4)
1370 | (vc
->vc_color
& 0x0f);
1376 static void respond_string(const char *p
, struct tty_struct
*tty
)
1379 tty_insert_flip_char(tty
, *p
, 0);
1382 con_schedule_flip(tty
);
1385 static void cursor_report(struct vc_data
*vc
, struct tty_struct
*tty
)
1389 sprintf(buf
, "\033[%d;%dR", vc
->vc_y
+ (vc
->vc_decom
? vc
->vc_top
+ 1 : 1), vc
->vc_x
+ 1);
1390 respond_string(buf
, tty
);
1393 static inline void status_report(struct tty_struct
*tty
)
1395 respond_string("\033[0n", tty
); /* Terminal ok */
1398 static inline void respond_ID(struct tty_struct
* tty
)
1400 respond_string(VT102ID
, tty
);
1403 void mouse_report(struct tty_struct
*tty
, int butt
, int mrx
, int mry
)
1407 sprintf(buf
, "\033[M%c%c%c", (char)(' ' + butt
), (char)('!' + mrx
),
1409 respond_string(buf
, tty
);
1412 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1413 int mouse_reporting(void)
1415 return vc_cons
[fg_console
].d
->vc_report_mouse
;
1418 /* console_sem is held */
1419 static void set_mode(struct vc_data
*vc
, int on_off
)
1423 for (i
= 0; i
<= vc
->vc_npar
; i
++)
1425 switch(vc
->vc_par
[i
]) { /* DEC private modes set/reset */
1426 case 1: /* Cursor keys send ^[Ox/^[[x */
1428 set_kbd(vc
, decckm
);
1430 clr_kbd(vc
, decckm
);
1432 case 3: /* 80/132 mode switch unimplemented */
1433 vc
->vc_deccolm
= on_off
;
1435 vc_resize(deccolm
? 132 : 80, vc
->vc_rows
);
1436 /* this alone does not suffice; some user mode
1437 utility has to change the hardware regs */
1440 case 5: /* Inverted screen on/off */
1441 if (vc
->vc_decscnm
!= on_off
) {
1442 vc
->vc_decscnm
= on_off
;
1443 invert_screen(vc
, 0, vc
->vc_screenbuf_size
, 0);
1447 case 6: /* Origin relative/absolute */
1448 vc
->vc_decom
= on_off
;
1451 case 7: /* Autowrap on/off */
1452 vc
->vc_decawm
= on_off
;
1454 case 8: /* Autorepeat on/off */
1456 set_kbd(vc
, decarm
);
1458 clr_kbd(vc
, decarm
);
1461 vc
->vc_report_mouse
= on_off
? 1 : 0;
1463 case 25: /* Cursor on/off */
1464 vc
->vc_deccm
= on_off
;
1467 vc
->vc_report_mouse
= on_off
? 2 : 0;
1471 switch(vc
->vc_par
[i
]) { /* ANSI modes set/reset */
1472 case 3: /* Monitor (display ctrls) */
1473 vc
->vc_disp_ctrl
= on_off
;
1475 case 4: /* Insert Mode on/off */
1476 vc
->vc_decim
= on_off
;
1478 case 20: /* Lf, Enter == CrLf/Lf */
1488 /* console_sem is held */
1489 static void setterm_command(struct vc_data
*vc
)
1491 switch(vc
->vc_par
[0]) {
1492 case 1: /* set color for underline mode */
1493 if (vc
->vc_can_do_color
&&
1494 vc
->vc_par
[1] < 16) {
1495 vc
->vc_ulcolor
= color_table
[vc
->vc_par
[1]];
1496 if (vc
->vc_underline
)
1500 case 2: /* set color for half intensity mode */
1501 if (vc
->vc_can_do_color
&&
1502 vc
->vc_par
[1] < 16) {
1503 vc
->vc_halfcolor
= color_table
[vc
->vc_par
[1]];
1504 if (vc
->vc_intensity
== 0)
1508 case 8: /* store colors as defaults */
1509 vc
->vc_def_color
= vc
->vc_attr
;
1510 if (vc
->vc_hi_font_mask
== 0x100)
1511 vc
->vc_def_color
>>= 1;
1515 case 9: /* set blanking interval */
1516 blankinterval
= ((vc
->vc_par
[1] < 60) ? vc
->vc_par
[1] : 60) * 60;
1517 poke_blanked_console();
1519 case 10: /* set bell frequency in Hz */
1520 if (vc
->vc_npar
>= 1)
1521 vc
->vc_bell_pitch
= vc
->vc_par
[1];
1523 vc
->vc_bell_pitch
= DEFAULT_BELL_PITCH
;
1525 case 11: /* set bell duration in msec */
1526 if (vc
->vc_npar
>= 1)
1527 vc
->vc_bell_duration
= (vc
->vc_par
[1] < 2000) ?
1528 vc
->vc_par
[1] * HZ
/ 1000 : 0;
1530 vc
->vc_bell_duration
= DEFAULT_BELL_DURATION
;
1532 case 12: /* bring specified console to the front */
1533 if (vc
->vc_par
[1] >= 1 && vc_cons_allocated(vc
->vc_par
[1] - 1))
1534 set_console(vc
->vc_par
[1] - 1);
1536 case 13: /* unblank the screen */
1537 poke_blanked_console();
1539 case 14: /* set vesa powerdown interval */
1540 vesa_off_interval
= ((vc
->vc_par
[1] < 60) ? vc
->vc_par
[1] : 60) * 60 * HZ
;
1542 case 15: /* activate the previous console */
1543 set_console(last_console
);
1548 /* console_sem is held */
1549 static void csi_at(struct vc_data
*vc
, unsigned int nr
)
1551 if (nr
> vc
->vc_cols
- vc
->vc_x
)
1552 nr
= vc
->vc_cols
- vc
->vc_x
;
1555 insert_char(vc
, nr
);
1558 /* console_sem is held */
1559 static void csi_L(struct vc_data
*vc
, unsigned int nr
)
1561 if (nr
> vc
->vc_rows
- vc
->vc_y
)
1562 nr
= vc
->vc_rows
- vc
->vc_y
;
1565 scrdown(vc
, vc
->vc_y
, vc
->vc_bottom
, nr
);
1566 vc
->vc_need_wrap
= 0;
1569 /* console_sem is held */
1570 static void csi_P(struct vc_data
*vc
, unsigned int nr
)
1572 if (nr
> vc
->vc_cols
- vc
->vc_x
)
1573 nr
= vc
->vc_cols
- vc
->vc_x
;
1576 delete_char(vc
, nr
);
1579 /* console_sem is held */
1580 static void csi_M(struct vc_data
*vc
, unsigned int nr
)
1582 if (nr
> vc
->vc_rows
- vc
->vc_y
)
1583 nr
= vc
->vc_rows
- vc
->vc_y
;
1586 scrup(vc
, vc
->vc_y
, vc
->vc_bottom
, nr
);
1587 vc
->vc_need_wrap
= 0;
1590 /* console_sem is held (except via vc_init->reset_terminal */
1591 static void save_cur(struct vc_data
*vc
)
1593 vc
->vc_saved_x
= vc
->vc_x
;
1594 vc
->vc_saved_y
= vc
->vc_y
;
1595 vc
->vc_s_intensity
= vc
->vc_intensity
;
1596 vc
->vc_s_italic
= vc
->vc_italic
;
1597 vc
->vc_s_underline
= vc
->vc_underline
;
1598 vc
->vc_s_blink
= vc
->vc_blink
;
1599 vc
->vc_s_reverse
= vc
->vc_reverse
;
1600 vc
->vc_s_charset
= vc
->vc_charset
;
1601 vc
->vc_s_color
= vc
->vc_color
;
1602 vc
->vc_saved_G0
= vc
->vc_G0_charset
;
1603 vc
->vc_saved_G1
= vc
->vc_G1_charset
;
1606 /* console_sem is held */
1607 static void restore_cur(struct vc_data
*vc
)
1609 gotoxy(vc
, vc
->vc_saved_x
, vc
->vc_saved_y
);
1610 vc
->vc_intensity
= vc
->vc_s_intensity
;
1611 vc
->vc_italic
= vc
->vc_s_italic
;
1612 vc
->vc_underline
= vc
->vc_s_underline
;
1613 vc
->vc_blink
= vc
->vc_s_blink
;
1614 vc
->vc_reverse
= vc
->vc_s_reverse
;
1615 vc
->vc_charset
= vc
->vc_s_charset
;
1616 vc
->vc_color
= vc
->vc_s_color
;
1617 vc
->vc_G0_charset
= vc
->vc_saved_G0
;
1618 vc
->vc_G1_charset
= vc
->vc_saved_G1
;
1619 vc
->vc_translate
= set_translate(vc
->vc_charset
? vc
->vc_G1_charset
: vc
->vc_G0_charset
, vc
);
1621 vc
->vc_need_wrap
= 0;
1624 enum { ESnormal
, ESesc
, ESsquare
, ESgetpars
, ESgotpars
, ESfunckey
,
1625 EShash
, ESsetG0
, ESsetG1
, ESpercent
, ESignore
, ESnonstd
,
1628 /* console_sem is held (except via vc_init()) */
1629 static void reset_terminal(struct vc_data
*vc
, int do_clear
)
1632 vc
->vc_bottom
= vc
->vc_rows
;
1633 vc
->vc_state
= ESnormal
;
1635 vc
->vc_translate
= set_translate(LAT1_MAP
, vc
);
1636 vc
->vc_G0_charset
= LAT1_MAP
;
1637 vc
->vc_G1_charset
= GRAF_MAP
;
1639 vc
->vc_need_wrap
= 0;
1640 vc
->vc_report_mouse
= 0;
1641 vc
->vc_utf
= default_utf8
;
1642 vc
->vc_utf_count
= 0;
1644 vc
->vc_disp_ctrl
= 0;
1645 vc
->vc_toggle_meta
= 0;
1650 vc
->vc_deccm
= global_cursor_default
;
1653 set_kbd(vc
, decarm
);
1654 clr_kbd(vc
, decckm
);
1655 clr_kbd(vc
, kbdapplic
);
1657 kbd_table
[vc
->vc_num
].lockstate
= 0;
1658 kbd_table
[vc
->vc_num
].slockstate
= 0;
1659 kbd_table
[vc
->vc_num
].ledmode
= LED_SHOW_FLAGS
;
1660 kbd_table
[vc
->vc_num
].ledflagstate
= kbd_table
[vc
->vc_num
].default_ledflagstate
;
1661 /* do not do set_leds here because this causes an endless tasklet loop
1662 when the keyboard hasn't been initialized yet */
1664 vc
->vc_cursor_type
= cur_default
;
1665 vc
->vc_complement_mask
= vc
->vc_s_complement_mask
;
1670 vc
->vc_tab_stop
[0] = 0x01010100;
1671 vc
->vc_tab_stop
[1] =
1672 vc
->vc_tab_stop
[2] =
1673 vc
->vc_tab_stop
[3] =
1674 vc
->vc_tab_stop
[4] =
1675 vc
->vc_tab_stop
[5] =
1676 vc
->vc_tab_stop
[6] =
1677 vc
->vc_tab_stop
[7] = 0x01010101;
1679 vc
->vc_bell_pitch
= DEFAULT_BELL_PITCH
;
1680 vc
->vc_bell_duration
= DEFAULT_BELL_DURATION
;
1688 /* console_sem is held */
1689 static void do_con_trol(struct tty_struct
*tty
, struct vc_data
*vc
, int c
)
1692 * Control characters can be used in the _middle_
1693 * of an escape sequence.
1699 if (vc
->vc_bell_duration
)
1700 kd_mksound(vc
->vc_bell_pitch
, vc
->vc_bell_duration
);
1706 vc
->vc_pos
-= (vc
->vc_x
<< 1);
1707 while (vc
->vc_x
< vc
->vc_cols
- 1) {
1709 if (vc
->vc_tab_stop
[vc
->vc_x
>> 5] & (1 << (vc
->vc_x
& 31)))
1712 vc
->vc_pos
+= (vc
->vc_x
<< 1);
1713 notify_write(vc
, '\t');
1715 case 10: case 11: case 12:
1717 if (!is_kbd(vc
, lnm
))
1724 vc
->vc_translate
= set_translate(vc
->vc_G1_charset
, vc
);
1725 vc
->vc_disp_ctrl
= 1;
1729 vc
->vc_translate
= set_translate(vc
->vc_G0_charset
, vc
);
1730 vc
->vc_disp_ctrl
= 0;
1733 vc
->vc_state
= ESnormal
;
1736 vc
->vc_state
= ESesc
;
1742 vc
->vc_state
= ESsquare
;
1745 switch(vc
->vc_state
) {
1747 vc
->vc_state
= ESnormal
;
1750 vc
->vc_state
= ESsquare
;
1753 vc
->vc_state
= ESnonstd
;
1756 vc
->vc_state
= ESpercent
;
1769 vc
->vc_tab_stop
[vc
->vc_x
>> 5] |= (1 << (vc
->vc_x
& 31));
1781 vc
->vc_state
= ESsetG0
;
1784 vc
->vc_state
= ESsetG1
;
1787 vc
->vc_state
= EShash
;
1790 reset_terminal(vc
, 1);
1792 case '>': /* Numeric keypad */
1793 clr_kbd(vc
, kbdapplic
);
1795 case '=': /* Appl. keypad */
1796 set_kbd(vc
, kbdapplic
);
1801 if (c
=='P') { /* palette escape sequence */
1802 for (vc
->vc_npar
= 0; vc
->vc_npar
< NPAR
; vc
->vc_npar
++)
1803 vc
->vc_par
[vc
->vc_npar
] = 0;
1805 vc
->vc_state
= ESpalette
;
1807 } else if (c
=='R') { /* reset palette */
1809 vc
->vc_state
= ESnormal
;
1811 vc
->vc_state
= ESnormal
;
1815 vc
->vc_par
[vc
->vc_npar
++] = hex_to_bin(c
);
1816 if (vc
->vc_npar
== 7) {
1817 int i
= vc
->vc_par
[0] * 3, j
= 1;
1818 vc
->vc_palette
[i
] = 16 * vc
->vc_par
[j
++];
1819 vc
->vc_palette
[i
++] += vc
->vc_par
[j
++];
1820 vc
->vc_palette
[i
] = 16 * vc
->vc_par
[j
++];
1821 vc
->vc_palette
[i
++] += vc
->vc_par
[j
++];
1822 vc
->vc_palette
[i
] = 16 * vc
->vc_par
[j
++];
1823 vc
->vc_palette
[i
] += vc
->vc_par
[j
];
1825 vc
->vc_state
= ESnormal
;
1828 vc
->vc_state
= ESnormal
;
1831 for (vc
->vc_npar
= 0; vc
->vc_npar
< NPAR
; vc
->vc_npar
++)
1832 vc
->vc_par
[vc
->vc_npar
] = 0;
1834 vc
->vc_state
= ESgetpars
;
1835 if (c
== '[') { /* Function key */
1836 vc
->vc_state
=ESfunckey
;
1839 vc
->vc_ques
= (c
== '?');
1843 if (c
== ';' && vc
->vc_npar
< NPAR
- 1) {
1846 } else if (c
>='0' && c
<='9') {
1847 vc
->vc_par
[vc
->vc_npar
] *= 10;
1848 vc
->vc_par
[vc
->vc_npar
] += c
- '0';
1851 vc
->vc_state
= ESgotpars
;
1853 vc
->vc_state
= ESnormal
;
1864 vc
->vc_cursor_type
= vc
->vc_par
[0] | (vc
->vc_par
[1] << 8) | (vc
->vc_par
[2] << 16);
1866 vc
->vc_cursor_type
= cur_default
;
1874 vc
->vc_complement_mask
= vc
->vc_par
[0] << 8 | vc
->vc_par
[1];
1876 vc
->vc_complement_mask
= vc
->vc_s_complement_mask
;
1882 if (vc
->vc_par
[0] == 5)
1884 else if (vc
->vc_par
[0] == 6)
1885 cursor_report(vc
, tty
);
1897 gotoxy(vc
, vc
->vc_par
[0], vc
->vc_y
);
1902 gotoxy(vc
, vc
->vc_x
, vc
->vc_y
- vc
->vc_par
[0]);
1907 gotoxy(vc
, vc
->vc_x
, vc
->vc_y
+ vc
->vc_par
[0]);
1912 gotoxy(vc
, vc
->vc_x
+ vc
->vc_par
[0], vc
->vc_y
);
1917 gotoxy(vc
, vc
->vc_x
- vc
->vc_par
[0], vc
->vc_y
);
1922 gotoxy(vc
, 0, vc
->vc_y
+ vc
->vc_par
[0]);
1927 gotoxy(vc
, 0, vc
->vc_y
- vc
->vc_par
[0]);
1932 gotoxay(vc
, vc
->vc_x
,vc
->vc_par
[0]);
1939 gotoxay(vc
, vc
->vc_par
[1], vc
->vc_par
[0]);
1942 csi_J(vc
, vc
->vc_par
[0]);
1945 csi_K(vc
, vc
->vc_par
[0]);
1948 csi_L(vc
, vc
->vc_par
[0]);
1951 csi_M(vc
, vc
->vc_par
[0]);
1954 csi_P(vc
, vc
->vc_par
[0]);
1962 vc
->vc_tab_stop
[vc
->vc_x
>> 5] &= ~(1 << (vc
->vc_x
& 31));
1963 else if (vc
->vc_par
[0] == 3) {
1964 vc
->vc_tab_stop
[0] =
1965 vc
->vc_tab_stop
[1] =
1966 vc
->vc_tab_stop
[2] =
1967 vc
->vc_tab_stop
[3] =
1968 vc
->vc_tab_stop
[4] =
1969 vc
->vc_tab_stop
[5] =
1970 vc
->vc_tab_stop
[6] =
1971 vc
->vc_tab_stop
[7] = 0;
1977 case 'q': /* DECLL - but only 3 leds */
1978 /* map 0,1,2,3 to 0,1,2,4 */
1979 if (vc
->vc_par
[0] < 4)
1980 setledstate(kbd_table
+ vc
->vc_num
,
1981 (vc
->vc_par
[0] < 3) ? vc
->vc_par
[0] : 4);
1987 vc
->vc_par
[1] = vc
->vc_rows
;
1988 /* Minimum allowed region is 2 lines */
1989 if (vc
->vc_par
[0] < vc
->vc_par
[1] &&
1990 vc
->vc_par
[1] <= vc
->vc_rows
) {
1991 vc
->vc_top
= vc
->vc_par
[0] - 1;
1992 vc
->vc_bottom
= vc
->vc_par
[1];
2003 csi_X(vc
, vc
->vc_par
[0]);
2006 csi_at(vc
, vc
->vc_par
[0]);
2008 case ']': /* setterm functions */
2009 setterm_command(vc
);
2014 vc
->vc_state
= ESnormal
;
2016 case '@': /* defined in ISO 2022 */
2019 case 'G': /* prelim official escape code */
2020 case '8': /* retained for compatibility */
2026 vc
->vc_state
= ESnormal
;
2029 vc
->vc_state
= ESnormal
;
2031 /* DEC screen alignment test. kludge :-) */
2032 vc
->vc_video_erase_char
=
2033 (vc
->vc_video_erase_char
& 0xff00) | 'E';
2035 vc
->vc_video_erase_char
=
2036 (vc
->vc_video_erase_char
& 0xff00) | ' ';
2037 do_update_region(vc
, vc
->vc_origin
, vc
->vc_screenbuf_size
/ 2);
2042 vc
->vc_G0_charset
= GRAF_MAP
;
2044 vc
->vc_G0_charset
= LAT1_MAP
;
2046 vc
->vc_G0_charset
= IBMPC_MAP
;
2048 vc
->vc_G0_charset
= USER_MAP
;
2049 if (vc
->vc_charset
== 0)
2050 vc
->vc_translate
= set_translate(vc
->vc_G0_charset
, vc
);
2051 vc
->vc_state
= ESnormal
;
2055 vc
->vc_G1_charset
= GRAF_MAP
;
2057 vc
->vc_G1_charset
= LAT1_MAP
;
2059 vc
->vc_G1_charset
= IBMPC_MAP
;
2061 vc
->vc_G1_charset
= USER_MAP
;
2062 if (vc
->vc_charset
== 1)
2063 vc
->vc_translate
= set_translate(vc
->vc_G1_charset
, vc
);
2064 vc
->vc_state
= ESnormal
;
2067 vc
->vc_state
= ESnormal
;
2071 /* This is a temporary buffer used to prepare a tty console write
2072 * so that we can easily avoid touching user space while holding the
2073 * console spinlock. It is allocated in con_init and is shared by
2074 * this code and the vc_screen read/write tty calls.
2076 * We have to allocate this statically in the kernel data section
2077 * since console_init (and thus con_init) are called before any
2078 * kernel memory allocation is available.
2080 char con_buf
[CON_BUF_SIZE
];
2081 DEFINE_MUTEX(con_buf_mtx
);
2083 /* is_double_width() is based on the wcwidth() implementation by
2084 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2085 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2092 static int bisearch(uint32_t ucs
, const struct interval
*table
, int max
)
2097 if (ucs
< table
[0].first
|| ucs
> table
[max
].last
)
2099 while (max
>= min
) {
2100 mid
= (min
+ max
) / 2;
2101 if (ucs
> table
[mid
].last
)
2103 else if (ucs
< table
[mid
].first
)
2111 static int is_double_width(uint32_t ucs
)
2113 static const struct interval double_width
[] = {
2114 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2115 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2116 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2117 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2119 return bisearch(ucs
, double_width
, ARRAY_SIZE(double_width
) - 1);
2122 /* acquires console_sem */
2123 static int do_con_write(struct tty_struct
*tty
, const unsigned char *buf
, int count
)
2125 #ifdef VT_BUF_VRAM_ONLY
2126 #define FLUSH do { } while(0);
2128 #define FLUSH if (draw_x >= 0) { \
2129 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2134 int c
, tc
, ok
, n
= 0, draw_x
= -1;
2135 unsigned int currcons
;
2136 unsigned long draw_from
= 0, draw_to
= 0;
2138 unsigned char vc_attr
;
2139 struct vt_notifier_param param
;
2143 u16 himask
, charmask
;
2150 acquire_console_sem();
2151 vc
= tty
->driver_data
;
2153 printk(KERN_ERR
"vt: argh, driver_data is NULL !\n");
2154 release_console_sem();
2158 currcons
= vc
->vc_num
;
2159 if (!vc_cons_allocated(currcons
)) {
2160 /* could this happen? */
2161 printk_once("con_write: tty %d not allocated\n", currcons
+1);
2162 release_console_sem();
2166 himask
= vc
->vc_hi_font_mask
;
2167 charmask
= himask
? 0x1ff : 0xff;
2169 /* undraw cursor first */
2175 while (!tty
->stopped
&& count
) {
2185 /* Do no translation at all in control states */
2186 if (vc
->vc_state
!= ESnormal
) {
2188 } else if (vc
->vc_utf
&& !vc
->vc_disp_ctrl
) {
2189 /* Combine UTF-8 into Unicode in vc_utf_char.
2190 * vc_utf_count is the number of continuation bytes still
2191 * expected to arrive.
2192 * vc_npar is the number of continuation bytes arrived so
2196 if ((c
& 0xc0) == 0x80) {
2197 /* Continuation byte received */
2198 static const uint32_t utf8_length_changes
[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2199 if (vc
->vc_utf_count
) {
2200 vc
->vc_utf_char
= (vc
->vc_utf_char
<< 6) | (c
& 0x3f);
2202 if (--vc
->vc_utf_count
) {
2203 /* Still need some bytes */
2206 /* Got a whole character */
2207 c
= vc
->vc_utf_char
;
2208 /* Reject overlong sequences */
2209 if (c
<= utf8_length_changes
[vc
->vc_npar
- 1] ||
2210 c
> utf8_length_changes
[vc
->vc_npar
])
2213 /* Unexpected continuation byte */
2214 vc
->vc_utf_count
= 0;
2218 /* Single ASCII byte or first byte of a sequence received */
2219 if (vc
->vc_utf_count
) {
2220 /* Continuation byte expected */
2222 vc
->vc_utf_count
= 0;
2224 } else if (c
> 0x7f) {
2225 /* First byte of a multibyte sequence received */
2227 if ((c
& 0xe0) == 0xc0) {
2228 vc
->vc_utf_count
= 1;
2229 vc
->vc_utf_char
= (c
& 0x1f);
2230 } else if ((c
& 0xf0) == 0xe0) {
2231 vc
->vc_utf_count
= 2;
2232 vc
->vc_utf_char
= (c
& 0x0f);
2233 } else if ((c
& 0xf8) == 0xf0) {
2234 vc
->vc_utf_count
= 3;
2235 vc
->vc_utf_char
= (c
& 0x07);
2236 } else if ((c
& 0xfc) == 0xf8) {
2237 vc
->vc_utf_count
= 4;
2238 vc
->vc_utf_char
= (c
& 0x03);
2239 } else if ((c
& 0xfe) == 0xfc) {
2240 vc
->vc_utf_count
= 5;
2241 vc
->vc_utf_char
= (c
& 0x01);
2243 /* 254 and 255 are invalid */
2246 if (vc
->vc_utf_count
) {
2247 /* Still need some bytes */
2251 /* Nothing to do if an ASCII byte was received */
2253 /* End of UTF-8 decoding. */
2254 /* c is the received character, or U+FFFD for invalid sequences. */
2255 /* Replace invalid Unicode code points with U+FFFD too */
2256 if ((c
>= 0xd800 && c
<= 0xdfff) || c
== 0xfffe || c
== 0xffff)
2259 } else { /* no utf or alternate charset mode */
2260 tc
= vc_translate(vc
, c
);
2264 if (atomic_notifier_call_chain(&vt_notifier_list
, VT_PREWRITE
,
2265 ¶m
) == NOTIFY_STOP
)
2268 /* If the original code was a control character we
2269 * only allow a glyph to be displayed if the code is
2270 * not normally used (such as for cursor movement) or
2271 * if the disp_ctrl mode has been explicitly enabled.
2272 * Certain characters (as given by the CTRL_ALWAYS
2273 * bitmap) are always displayed as control characters,
2274 * as the console would be pretty useless without
2275 * them; to display an arbitrary font position use the
2276 * direct-to-font zone in UTF-8 mode.
2278 ok
= tc
&& (c
>= 32 ||
2279 !(vc
->vc_disp_ctrl
? (CTRL_ALWAYS
>> c
) & 1 :
2280 vc
->vc_utf
|| ((CTRL_ACTION
>> c
) & 1)))
2281 && (c
!= 127 || vc
->vc_disp_ctrl
)
2284 if (vc
->vc_state
== ESnormal
&& ok
) {
2285 if (vc
->vc_utf
&& !vc
->vc_disp_ctrl
) {
2286 if (is_double_width(c
))
2289 /* Now try to find out how to display it */
2290 tc
= conv_uni_to_pc(vc
, tc
);
2291 if (tc
& ~charmask
) {
2292 if (tc
== -1 || tc
== -2) {
2293 continue; /* nothing to display */
2295 /* Glyph not found */
2296 if ((!(vc
->vc_utf
&& !vc
->vc_disp_ctrl
) || c
< 128) && !(c
& ~charmask
)) {
2297 /* In legacy mode use the glyph we get by a 1:1 mapping.
2298 This would make absolutely no sense with Unicode in mind,
2299 but do this for ASCII characters since a font may lack
2300 Unicode mapping info and we don't want to end up with
2301 having question marks only. */
2304 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2305 tc
= conv_uni_to_pc(vc
, 0xfffd);
2308 tc
= conv_uni_to_pc(vc
, '?');
2309 if (tc
< 0) tc
= '?';
2315 vc_attr
= vc
->vc_attr
;
2317 /* invert vc_attr */
2318 if (!vc
->vc_can_do_color
) {
2319 vc_attr
= (vc
->vc_attr
) ^ 0x08;
2320 } else if (vc
->vc_hi_font_mask
== 0x100) {
2321 vc_attr
= ((vc
->vc_attr
) & 0x11) | (((vc
->vc_attr
) & 0xe0) >> 4) | (((vc
->vc_attr
) & 0x0e) << 4);
2323 vc_attr
= ((vc
->vc_attr
) & 0x88) | (((vc
->vc_attr
) & 0x70) >> 4) | (((vc
->vc_attr
) & 0x07) << 4);
2329 if (vc
->vc_need_wrap
|| vc
->vc_decim
)
2331 if (vc
->vc_need_wrap
) {
2338 ((vc_attr
<< 8) & ~himask
) + ((tc
& 0x100) ? himask
: 0) + (tc
& 0xff) :
2339 (vc_attr
<< 8) + tc
,
2340 (u16
*) vc
->vc_pos
);
2341 if (DO_UPDATE(vc
) && draw_x
< 0) {
2343 draw_from
= vc
->vc_pos
;
2345 if (vc
->vc_x
== vc
->vc_cols
- 1) {
2346 vc
->vc_need_wrap
= vc
->vc_decawm
;
2347 draw_to
= vc
->vc_pos
+ 2;
2350 draw_to
= (vc
->vc_pos
+= 2);
2353 if (!--width
) break;
2355 tc
= conv_uni_to_pc(vc
, ' '); /* A space is printed in the second column */
2356 if (tc
< 0) tc
= ' ';
2358 notify_write(vc
, c
);
2369 goto rescan_last_byte
;
2374 do_con_trol(tty
, vc
, orig
);
2377 console_conditional_schedule();
2378 release_console_sem();
2385 * This is the console switching callback.
2387 * Doing console switching in a process context allows
2388 * us to do the switches asynchronously (needed when we want
2389 * to switch due to a keyboard interrupt). Synchronization
2390 * with other console code and prevention of re-entrancy is
2391 * ensured with console_sem.
2393 static void console_callback(struct work_struct
*ignored
)
2395 acquire_console_sem();
2397 if (want_console
>= 0) {
2398 if (want_console
!= fg_console
&&
2399 vc_cons_allocated(want_console
)) {
2400 hide_cursor(vc_cons
[fg_console
].d
);
2401 change_console(vc_cons
[want_console
].d
);
2402 /* we only changed when the console had already
2403 been allocated - a new console is not created
2404 in an interrupt routine */
2408 if (do_poke_blanked_console
) { /* do not unblank for a LED change */
2409 do_poke_blanked_console
= 0;
2410 poke_blanked_console();
2412 if (scrollback_delta
) {
2413 struct vc_data
*vc
= vc_cons
[fg_console
].d
;
2415 if (vc
->vc_mode
== KD_TEXT
)
2416 vc
->vc_sw
->con_scrolldelta(vc
, scrollback_delta
);
2417 scrollback_delta
= 0;
2419 if (blank_timer_expired
) {
2421 blank_timer_expired
= 0;
2423 notify_update(vc_cons
[fg_console
].d
);
2425 release_console_sem();
2428 int set_console(int nr
)
2430 struct vc_data
*vc
= vc_cons
[fg_console
].d
;
2432 if (!vc_cons_allocated(nr
) || vt_dont_switch
||
2433 (vc
->vt_mode
.mode
== VT_AUTO
&& vc
->vc_mode
== KD_GRAPHICS
)) {
2436 * Console switch will fail in console_callback() or
2437 * change_console() so there is no point scheduling
2440 * Existing set_console() users don't check the return
2441 * value so this shouldn't break anything
2447 schedule_console_callback();
2452 struct tty_driver
*console_driver
;
2454 #ifdef CONFIG_VT_CONSOLE
2457 * vt_kmsg_redirect() - Sets/gets the kernel message console
2458 * @new: The new virtual terminal number or -1 if the console should stay
2461 * By default, the kernel messages are always printed on the current virtual
2462 * console. However, the user may modify that default with the
2463 * TIOCL_SETKMSGREDIRECT ioctl call.
2465 * This function sets the kernel message console to be @new. It returns the old
2466 * virtual console number. The virtual terminal number 0 (both as parameter and
2467 * return value) means no redirection (i.e. always printed on the currently
2470 * The parameter -1 means that only the current console is returned, but the
2471 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2472 * case to make the code more understandable.
2474 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2475 * the parameter and always returns 0.
2477 int vt_kmsg_redirect(int new)
2479 static int kmsg_con
;
2482 return xchg(&kmsg_con
, new);
2488 * Console on virtual terminal
2490 * The console must be locked when we get here.
2493 static void vt_console_print(struct console
*co
, const char *b
, unsigned count
)
2495 struct vc_data
*vc
= vc_cons
[fg_console
].d
;
2497 static DEFINE_SPINLOCK(printing_lock
);
2498 const ushort
*start
;
2503 /* console busy or not yet initialized */
2506 if (!spin_trylock(&printing_lock
))
2509 kmsg_console
= vt_get_kmsg_redirect();
2510 if (kmsg_console
&& vc_cons_allocated(kmsg_console
- 1))
2511 vc
= vc_cons
[kmsg_console
- 1].d
;
2513 /* read `x' only after setting currcons properly (otherwise
2514 the `x' macro will read the x of the foreground console). */
2517 if (!vc_cons_allocated(fg_console
)) {
2519 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2523 if (vc
->vc_mode
!= KD_TEXT
&& !vt_force_oops_output(vc
))
2526 /* undraw cursor first */
2530 start
= (ushort
*)vc
->vc_pos
;
2532 /* Contrived structure to try to emulate original need_wrap behaviour
2533 * Problems caused when we have need_wrap set on '\n' character */
2536 if (c
== 10 || c
== 13 || c
== 8 || vc
->vc_need_wrap
) {
2538 if (CON_IS_VISIBLE(vc
))
2539 vc
->vc_sw
->con_putcs(vc
, start
, cnt
, vc
->vc_y
, vc
->vc_x
);
2541 if (vc
->vc_need_wrap
)
2545 if (c
== 8) { /* backspace */
2547 start
= (ushort
*)vc
->vc_pos
;
2554 start
= (ushort
*)vc
->vc_pos
;
2556 if (c
== 10 || c
== 13)
2559 scr_writew((vc
->vc_attr
<< 8) + c
, (unsigned short *)vc
->vc_pos
);
2560 notify_write(vc
, c
);
2562 if (myx
== vc
->vc_cols
- 1) {
2563 vc
->vc_need_wrap
= 1;
2570 if (CON_IS_VISIBLE(vc
))
2571 vc
->vc_sw
->con_putcs(vc
, start
, cnt
, vc
->vc_y
, vc
->vc_x
);
2573 if (vc
->vc_x
== vc
->vc_cols
) {
2575 vc
->vc_need_wrap
= 1;
2582 spin_unlock(&printing_lock
);
2585 static struct tty_driver
*vt_console_device(struct console
*c
, int *index
)
2587 *index
= c
->index
? c
->index
-1 : fg_console
;
2588 return console_driver
;
2591 static struct console vt_console_driver
= {
2593 .write
= vt_console_print
,
2594 .device
= vt_console_device
,
2595 .unblank
= unblank_screen
,
2596 .flags
= CON_PRINTBUFFER
,
2602 * Handling of Linux-specific VC ioctls
2606 * Generally a bit racy with respect to console_sem().
2608 * There are some functions which don't need it.
2610 * There are some functions which can sleep for arbitrary periods
2611 * (paste_selection) but we don't need the lock there anyway.
2613 * set_selection has locking, and definitely needs it
2616 int tioclinux(struct tty_struct
*tty
, unsigned long arg
)
2619 char __user
*p
= (char __user
*)arg
;
2623 if (current
->signal
->tty
!= tty
&& !capable(CAP_SYS_ADMIN
))
2625 if (get_user(type
, p
))
2632 acquire_console_sem();
2633 ret
= set_selection((struct tiocl_selection __user
*)(p
+1), tty
);
2634 release_console_sem();
2636 case TIOCL_PASTESEL
:
2637 ret
= paste_selection(tty
);
2639 case TIOCL_UNBLANKSCREEN
:
2640 acquire_console_sem();
2642 release_console_sem();
2644 case TIOCL_SELLOADLUT
:
2645 ret
= sel_loadlut(p
);
2647 case TIOCL_GETSHIFTSTATE
:
2650 * Make it possible to react to Shift+Mousebutton.
2651 * Note that 'shift_state' is an undocumented
2652 * kernel-internal variable; programs not closely
2653 * related to the kernel should not use this.
2656 ret
= __put_user(data
, p
);
2658 case TIOCL_GETMOUSEREPORTING
:
2659 data
= mouse_reporting();
2660 ret
= __put_user(data
, p
);
2662 case TIOCL_SETVESABLANK
:
2663 ret
= set_vesa_blanking(p
);
2665 case TIOCL_GETKMSGREDIRECT
:
2666 data
= vt_get_kmsg_redirect();
2667 ret
= __put_user(data
, p
);
2669 case TIOCL_SETKMSGREDIRECT
:
2670 if (!capable(CAP_SYS_ADMIN
)) {
2673 if (get_user(data
, p
+1))
2676 vt_kmsg_redirect(data
);
2679 case TIOCL_GETFGCONSOLE
:
2682 case TIOCL_SCROLLCONSOLE
:
2683 if (get_user(lines
, (s32 __user
*)(p
+4))) {
2686 scrollfront(vc_cons
[fg_console
].d
, lines
);
2690 case TIOCL_BLANKSCREEN
: /* until explicitly unblanked, not only poked */
2691 acquire_console_sem();
2694 release_console_sem();
2696 case TIOCL_BLANKEDSCREEN
:
2697 ret
= console_blanked
;
2707 * /dev/ttyN handling
2710 static int con_write(struct tty_struct
*tty
, const unsigned char *buf
, int count
)
2714 retval
= do_con_write(tty
, buf
, count
);
2715 con_flush_chars(tty
);
2720 static int con_put_char(struct tty_struct
*tty
, unsigned char ch
)
2723 return 0; /* n_r3964 calls put_char() from interrupt context */
2724 return do_con_write(tty
, &ch
, 1);
2727 static int con_write_room(struct tty_struct
*tty
)
2731 return 32768; /* No limit, really; we're not buffering */
2734 static int con_chars_in_buffer(struct tty_struct
*tty
)
2736 return 0; /* we're not buffering */
2740 * con_throttle and con_unthrottle are only used for
2741 * paste_selection(), which has to stuff in a large number of
2744 static void con_throttle(struct tty_struct
*tty
)
2748 static void con_unthrottle(struct tty_struct
*tty
)
2750 struct vc_data
*vc
= tty
->driver_data
;
2752 wake_up_interruptible(&vc
->paste_wait
);
2756 * Turn the Scroll-Lock LED on when the tty is stopped
2758 static void con_stop(struct tty_struct
*tty
)
2763 console_num
= tty
->index
;
2764 if (!vc_cons_allocated(console_num
))
2766 set_vc_kbd_led(kbd_table
+ console_num
, VC_SCROLLOCK
);
2771 * Turn the Scroll-Lock LED off when the console is started
2773 static void con_start(struct tty_struct
*tty
)
2778 console_num
= tty
->index
;
2779 if (!vc_cons_allocated(console_num
))
2781 clr_vc_kbd_led(kbd_table
+ console_num
, VC_SCROLLOCK
);
2785 static void con_flush_chars(struct tty_struct
*tty
)
2789 if (in_interrupt()) /* from flush_to_ldisc */
2792 /* if we race with con_close(), vt may be null */
2793 acquire_console_sem();
2794 vc
= tty
->driver_data
;
2797 release_console_sem();
2801 * Allocate the console screen memory.
2803 static int con_open(struct tty_struct
*tty
, struct file
*filp
)
2805 unsigned int currcons
= tty
->index
;
2808 acquire_console_sem();
2809 if (tty
->driver_data
== NULL
) {
2810 ret
= vc_allocate(currcons
);
2812 struct vc_data
*vc
= vc_cons
[currcons
].d
;
2814 /* Still being freed */
2816 release_console_sem();
2817 return -ERESTARTSYS
;
2819 tty
->driver_data
= vc
;
2822 if (!tty
->winsize
.ws_row
&& !tty
->winsize
.ws_col
) {
2823 tty
->winsize
.ws_row
= vc_cons
[currcons
].d
->vc_rows
;
2824 tty
->winsize
.ws_col
= vc_cons
[currcons
].d
->vc_cols
;
2827 tty
->termios
->c_iflag
|= IUTF8
;
2829 tty
->termios
->c_iflag
&= ~IUTF8
;
2830 release_console_sem();
2834 release_console_sem();
2838 static void con_close(struct tty_struct
*tty
, struct file
*filp
)
2840 /* Nothing to do - we defer to shutdown */
2843 static void con_shutdown(struct tty_struct
*tty
)
2845 struct vc_data
*vc
= tty
->driver_data
;
2847 acquire_console_sem();
2848 vc
->port
.tty
= NULL
;
2849 release_console_sem();
2853 static int default_italic_color
= 2; // green (ASCII)
2854 static int default_underline_color
= 3; // cyan (ASCII)
2855 module_param_named(italic
, default_italic_color
, int, S_IRUGO
| S_IWUSR
);
2856 module_param_named(underline
, default_underline_color
, int, S_IRUGO
| S_IWUSR
);
2858 static void vc_init(struct vc_data
*vc
, unsigned int rows
,
2859 unsigned int cols
, int do_clear
)
2865 vc
->vc_size_row
= cols
<< 1;
2866 vc
->vc_screenbuf_size
= vc
->vc_rows
* vc
->vc_size_row
;
2869 vc
->vc_pos
= vc
->vc_origin
;
2871 for (j
=k
=0; j
<16; j
++) {
2872 vc
->vc_palette
[k
++] = default_red
[j
] ;
2873 vc
->vc_palette
[k
++] = default_grn
[j
] ;
2874 vc
->vc_palette
[k
++] = default_blu
[j
] ;
2876 vc
->vc_def_color
= 0x07; /* white */
2877 vc
->vc_ulcolor
= default_underline_color
;
2878 vc
->vc_itcolor
= default_italic_color
;
2879 vc
->vc_halfcolor
= 0x08; /* grey */
2880 init_waitqueue_head(&vc
->paste_wait
);
2881 reset_terminal(vc
, do_clear
);
2885 * This routine initializes console interrupts, and does nothing
2886 * else. If you want the screen to clear, call tty_write with
2887 * the appropriate escape-sequence.
2890 static int __init
con_init(void)
2892 const char *display_desc
= NULL
;
2894 unsigned int currcons
= 0, i
;
2896 acquire_console_sem();
2899 display_desc
= conswitchp
->con_startup();
2900 if (!display_desc
) {
2902 release_console_sem();
2906 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
2907 struct con_driver
*con_driver
= ®istered_con_driver
[i
];
2909 if (con_driver
->con
== NULL
) {
2910 con_driver
->con
= conswitchp
;
2911 con_driver
->desc
= display_desc
;
2912 con_driver
->flag
= CON_DRIVER_FLAG_INIT
;
2913 con_driver
->first
= 0;
2914 con_driver
->last
= MAX_NR_CONSOLES
- 1;
2919 for (i
= 0; i
< MAX_NR_CONSOLES
; i
++)
2920 con_driver_map
[i
] = conswitchp
;
2922 if (blankinterval
) {
2923 blank_state
= blank_normal_wait
;
2924 mod_timer(&console_timer
, jiffies
+ (blankinterval
* HZ
));
2927 for (currcons
= 0; currcons
< MIN_NR_CONSOLES
; currcons
++) {
2928 vc_cons
[currcons
].d
= vc
= kzalloc(sizeof(struct vc_data
), GFP_NOWAIT
);
2929 INIT_WORK(&vc_cons
[currcons
].SAK_work
, vc_SAK
);
2930 tty_port_init(&vc
->port
);
2931 visual_init(vc
, currcons
, 1);
2932 vc
->vc_screenbuf
= kzalloc(vc
->vc_screenbuf_size
, GFP_NOWAIT
);
2933 vc_init(vc
, vc
->vc_rows
, vc
->vc_cols
,
2934 currcons
|| !vc
->vc_sw
->con_save_screen
);
2936 currcons
= fg_console
= 0;
2937 master_display_fg
= vc
= vc_cons
[currcons
].d
;
2940 gotoxy(vc
, vc
->vc_x
, vc
->vc_y
);
2943 printk("Console: %s %s %dx%d",
2944 vc
->vc_can_do_color
? "colour" : "mono",
2945 display_desc
, vc
->vc_cols
, vc
->vc_rows
);
2949 release_console_sem();
2951 #ifdef CONFIG_VT_CONSOLE
2952 register_console(&vt_console_driver
);
2956 console_initcall(con_init
);
2958 static const struct tty_operations con_ops
= {
2962 .write_room
= con_write_room
,
2963 .put_char
= con_put_char
,
2964 .flush_chars
= con_flush_chars
,
2965 .chars_in_buffer
= con_chars_in_buffer
,
2967 #ifdef CONFIG_COMPAT
2968 .compat_ioctl
= vt_compat_ioctl
,
2972 .throttle
= con_throttle
,
2973 .unthrottle
= con_unthrottle
,
2974 .resize
= vt_resize
,
2975 .shutdown
= con_shutdown
2978 static struct cdev vc0_cdev
;
2980 static ssize_t
show_tty_active(struct device
*dev
,
2981 struct device_attribute
*attr
, char *buf
)
2983 return sprintf(buf
, "tty%d\n", fg_console
+ 1);
2985 static DEVICE_ATTR(active
, S_IRUGO
, show_tty_active
, NULL
);
2987 int __init
vty_init(const struct file_operations
*console_fops
)
2989 cdev_init(&vc0_cdev
, console_fops
);
2990 if (cdev_add(&vc0_cdev
, MKDEV(TTY_MAJOR
, 0), 1) ||
2991 register_chrdev_region(MKDEV(TTY_MAJOR
, 0), 1, "/dev/vc/0") < 0)
2992 panic("Couldn't register /dev/tty0 driver\n");
2993 tty0dev
= device_create(tty_class
, NULL
, MKDEV(TTY_MAJOR
, 0), NULL
, "tty0");
2994 if (IS_ERR(tty0dev
))
2997 device_create_file(tty0dev
, &dev_attr_active
);
3001 console_driver
= alloc_tty_driver(MAX_NR_CONSOLES
);
3002 if (!console_driver
)
3003 panic("Couldn't allocate console driver\n");
3004 console_driver
->owner
= THIS_MODULE
;
3005 console_driver
->name
= "tty";
3006 console_driver
->name_base
= 1;
3007 console_driver
->major
= TTY_MAJOR
;
3008 console_driver
->minor_start
= 1;
3009 console_driver
->type
= TTY_DRIVER_TYPE_CONSOLE
;
3010 console_driver
->init_termios
= tty_std_termios
;
3012 console_driver
->init_termios
.c_iflag
|= IUTF8
;
3013 console_driver
->flags
= TTY_DRIVER_REAL_RAW
| TTY_DRIVER_RESET_TERMIOS
;
3014 tty_set_operations(console_driver
, &con_ops
);
3015 if (tty_register_driver(console_driver
))
3016 panic("Couldn't register console driver\n");
3019 #ifdef CONFIG_MDA_CONSOLE
3025 #ifndef VT_SINGLE_DRIVER
3027 static struct class *vtconsole_class
;
3029 static int bind_con_driver(const struct consw
*csw
, int first
, int last
,
3032 struct module
*owner
= csw
->owner
;
3033 const char *desc
= NULL
;
3034 struct con_driver
*con_driver
;
3035 int i
, j
= -1, k
= -1, retval
= -ENODEV
;
3037 if (!try_module_get(owner
))
3040 acquire_console_sem();
3042 /* check if driver is registered */
3043 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
3044 con_driver
= ®istered_con_driver
[i
];
3046 if (con_driver
->con
== csw
) {
3047 desc
= con_driver
->desc
;
3056 if (!(con_driver
->flag
& CON_DRIVER_FLAG_INIT
)) {
3058 con_driver
->flag
|= CON_DRIVER_FLAG_INIT
;
3063 module_put(conswitchp
->owner
);
3065 __module_get(owner
);
3069 first
= max(first
, con_driver
->first
);
3070 last
= min(last
, con_driver
->last
);
3072 for (i
= first
; i
<= last
; i
++) {
3074 struct vc_data
*vc
= vc_cons
[i
].d
;
3076 if (con_driver_map
[i
])
3077 module_put(con_driver_map
[i
]->owner
);
3078 __module_get(owner
);
3079 con_driver_map
[i
] = csw
;
3081 if (!vc
|| !vc
->vc_sw
)
3086 if (CON_IS_VISIBLE(vc
)) {
3091 old_was_color
= vc
->vc_can_do_color
;
3092 vc
->vc_sw
->con_deinit(vc
);
3093 vc
->vc_origin
= (unsigned long)vc
->vc_screenbuf
;
3094 visual_init(vc
, i
, 0);
3098 /* If the console changed between mono <-> color, then
3099 * the attributes in the screenbuf will be wrong. The
3100 * following resets all attributes to something sane.
3102 if (old_was_color
!= vc
->vc_can_do_color
)
3103 clear_buffer_attributes(vc
);
3106 printk("Console: switching ");
3108 printk("consoles %d-%d ", first
+1, last
+1);
3110 struct vc_data
*vc
= vc_cons
[j
].d
;
3112 printk("to %s %s %dx%d\n",
3113 vc
->vc_can_do_color
? "colour" : "mono",
3114 desc
, vc
->vc_cols
, vc
->vc_rows
);
3121 printk("to %s\n", desc
);
3125 release_console_sem();
3130 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3131 static int con_is_graphics(const struct consw
*csw
, int first
, int last
)
3135 for (i
= first
; i
<= last
; i
++) {
3136 struct vc_data
*vc
= vc_cons
[i
].d
;
3138 if (vc
&& vc
->vc_mode
== KD_GRAPHICS
) {
3148 * unbind_con_driver - unbind a console driver
3149 * @csw: pointer to console driver to unregister
3150 * @first: first in range of consoles that @csw should be unbound from
3151 * @last: last in range of consoles that @csw should be unbound from
3152 * @deflt: should next bound console driver be default after @csw is unbound?
3154 * To unbind a driver from all possible consoles, pass 0 as @first and
3155 * %MAX_NR_CONSOLES as @last.
3157 * @deflt controls whether the console that ends up replacing @csw should be
3158 * the default console.
3161 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3164 int unbind_con_driver(const struct consw
*csw
, int first
, int last
, int deflt
)
3166 struct module
*owner
= csw
->owner
;
3167 const struct consw
*defcsw
= NULL
;
3168 struct con_driver
*con_driver
= NULL
, *con_back
= NULL
;
3169 int i
, retval
= -ENODEV
;
3171 if (!try_module_get(owner
))
3174 acquire_console_sem();
3176 /* check if driver is registered and if it is unbindable */
3177 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
3178 con_driver
= ®istered_con_driver
[i
];
3180 if (con_driver
->con
== csw
&&
3181 con_driver
->flag
& CON_DRIVER_FLAG_MODULE
) {
3188 release_console_sem();
3194 /* check if backup driver exists */
3195 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
3196 con_back
= ®istered_con_driver
[i
];
3198 if (con_back
->con
&&
3199 !(con_back
->flag
& CON_DRIVER_FLAG_MODULE
)) {
3200 defcsw
= con_back
->con
;
3207 release_console_sem();
3211 if (!con_is_bound(csw
)) {
3212 release_console_sem();
3216 first
= max(first
, con_driver
->first
);
3217 last
= min(last
, con_driver
->last
);
3219 for (i
= first
; i
<= last
; i
++) {
3220 if (con_driver_map
[i
] == csw
) {
3221 module_put(csw
->owner
);
3222 con_driver_map
[i
] = NULL
;
3226 if (!con_is_bound(defcsw
)) {
3227 const struct consw
*defconsw
= conswitchp
;
3229 defcsw
->con_startup();
3230 con_back
->flag
|= CON_DRIVER_FLAG_INIT
;
3232 * vgacon may change the default driver to point
3233 * to dummycon, we restore it here...
3235 conswitchp
= defconsw
;
3238 if (!con_is_bound(csw
))
3239 con_driver
->flag
&= ~CON_DRIVER_FLAG_INIT
;
3241 release_console_sem();
3242 /* ignore return value, binding should not fail */
3243 bind_con_driver(defcsw
, first
, last
, deflt
);
3249 EXPORT_SYMBOL(unbind_con_driver
);
3251 static int vt_bind(struct con_driver
*con
)
3253 const struct consw
*defcsw
= NULL
, *csw
= NULL
;
3254 int i
, more
= 1, first
= -1, last
= -1, deflt
= 0;
3256 if (!con
->con
|| !(con
->flag
& CON_DRIVER_FLAG_MODULE
) ||
3257 con_is_graphics(con
->con
, con
->first
, con
->last
))
3262 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
3263 struct con_driver
*con
= ®istered_con_driver
[i
];
3265 if (con
->con
&& !(con
->flag
& CON_DRIVER_FLAG_MODULE
)) {
3277 for (i
= con
->first
; i
<= con
->last
; i
++) {
3278 if (con_driver_map
[i
] == defcsw
) {
3283 } else if (first
!= -1)
3287 if (first
== 0 && last
== MAX_NR_CONSOLES
-1)
3291 bind_con_driver(csw
, first
, last
, deflt
);
3302 static int vt_unbind(struct con_driver
*con
)
3304 const struct consw
*csw
= NULL
;
3305 int i
, more
= 1, first
= -1, last
= -1, deflt
= 0;
3307 if (!con
->con
|| !(con
->flag
& CON_DRIVER_FLAG_MODULE
) ||
3308 con_is_graphics(con
->con
, con
->first
, con
->last
))
3316 for (i
= con
->first
; i
<= con
->last
; i
++) {
3317 if (con_driver_map
[i
] == csw
) {
3322 } else if (first
!= -1)
3326 if (first
== 0 && last
== MAX_NR_CONSOLES
-1)
3330 unbind_con_driver(csw
, first
, last
, deflt
);
3341 static inline int vt_bind(struct con_driver
*con
)
3345 static inline int vt_unbind(struct con_driver
*con
)
3349 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3351 static ssize_t
store_bind(struct device
*dev
, struct device_attribute
*attr
,
3352 const char *buf
, size_t count
)
3354 struct con_driver
*con
= dev_get_drvdata(dev
);
3355 int bind
= simple_strtoul(buf
, NULL
, 0);
3365 static ssize_t
show_bind(struct device
*dev
, struct device_attribute
*attr
,
3368 struct con_driver
*con
= dev_get_drvdata(dev
);
3369 int bind
= con_is_bound(con
->con
);
3371 return snprintf(buf
, PAGE_SIZE
, "%i\n", bind
);
3374 static ssize_t
show_name(struct device
*dev
, struct device_attribute
*attr
,
3377 struct con_driver
*con
= dev_get_drvdata(dev
);
3379 return snprintf(buf
, PAGE_SIZE
, "%s %s\n",
3380 (con
->flag
& CON_DRIVER_FLAG_MODULE
) ? "(M)" : "(S)",
3385 static struct device_attribute device_attrs
[] = {
3386 __ATTR(bind
, S_IRUGO
|S_IWUSR
, show_bind
, store_bind
),
3387 __ATTR(name
, S_IRUGO
, show_name
, NULL
),
3390 static int vtconsole_init_device(struct con_driver
*con
)
3395 con
->flag
|= CON_DRIVER_FLAG_ATTR
;
3396 dev_set_drvdata(con
->dev
, con
);
3397 for (i
= 0; i
< ARRAY_SIZE(device_attrs
); i
++) {
3398 error
= device_create_file(con
->dev
, &device_attrs
[i
]);
3405 device_remove_file(con
->dev
, &device_attrs
[i
]);
3406 con
->flag
&= ~CON_DRIVER_FLAG_ATTR
;
3412 static void vtconsole_deinit_device(struct con_driver
*con
)
3416 if (con
->flag
& CON_DRIVER_FLAG_ATTR
) {
3417 for (i
= 0; i
< ARRAY_SIZE(device_attrs
); i
++)
3418 device_remove_file(con
->dev
, &device_attrs
[i
]);
3419 con
->flag
&= ~CON_DRIVER_FLAG_ATTR
;
3424 * con_is_bound - checks if driver is bound to the console
3425 * @csw: console driver
3427 * RETURNS: zero if unbound, nonzero if bound
3429 * Drivers can call this and if zero, they should release
3430 * all resources allocated on con_startup()
3432 int con_is_bound(const struct consw
*csw
)
3436 for (i
= 0; i
< MAX_NR_CONSOLES
; i
++) {
3437 if (con_driver_map
[i
] == csw
) {
3445 EXPORT_SYMBOL(con_is_bound
);
3448 * con_debug_enter - prepare the console for the kernel debugger
3449 * @sw: console driver
3451 * Called when the console is taken over by the kernel debugger, this
3452 * function needs to save the current console state, then put the console
3453 * into a state suitable for the kernel debugger.
3456 * Zero on success, nonzero if a failure occurred when trying to prepare
3457 * the console for the debugger.
3459 int con_debug_enter(struct vc_data
*vc
)
3463 saved_fg_console
= fg_console
;
3464 saved_last_console
= last_console
;
3465 saved_want_console
= want_console
;
3466 saved_vc_mode
= vc
->vc_mode
;
3467 saved_console_blanked
= console_blanked
;
3468 vc
->vc_mode
= KD_TEXT
;
3469 console_blanked
= 0;
3470 if (vc
->vc_sw
->con_debug_enter
)
3471 ret
= vc
->vc_sw
->con_debug_enter(vc
);
3472 #ifdef CONFIG_KGDB_KDB
3473 /* Set the initial LINES variable if it is not already set */
3474 if (vc
->vc_rows
< 999) {
3477 const char *setargs
[3] = {
3482 if (kdbgetintenv(setargs
[0], &linecount
)) {
3483 snprintf(lns
, 4, "%i", vc
->vc_rows
);
3484 kdb_set(2, setargs
);
3487 #endif /* CONFIG_KGDB_KDB */
3490 EXPORT_SYMBOL_GPL(con_debug_enter
);
3493 * con_debug_leave - restore console state
3494 * @sw: console driver
3496 * Restore the console state to what it was before the kernel debugger
3500 * Zero on success, nonzero if a failure occurred when trying to restore
3503 int con_debug_leave(void)
3508 fg_console
= saved_fg_console
;
3509 last_console
= saved_last_console
;
3510 want_console
= saved_want_console
;
3511 console_blanked
= saved_console_blanked
;
3512 vc_cons
[fg_console
].d
->vc_mode
= saved_vc_mode
;
3514 vc
= vc_cons
[fg_console
].d
;
3515 if (vc
->vc_sw
->con_debug_leave
)
3516 ret
= vc
->vc_sw
->con_debug_leave(vc
);
3519 EXPORT_SYMBOL_GPL(con_debug_leave
);
3522 * register_con_driver - register console driver to console layer
3523 * @csw: console driver
3524 * @first: the first console to take over, minimum value is 0
3525 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3527 * DESCRIPTION: This function registers a console driver which can later
3528 * bind to a range of consoles specified by @first and @last. It will
3529 * also initialize the console driver by calling con_startup().
3531 int register_con_driver(const struct consw
*csw
, int first
, int last
)
3533 struct module
*owner
= csw
->owner
;
3534 struct con_driver
*con_driver
;
3538 if (!try_module_get(owner
))
3541 acquire_console_sem();
3543 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
3544 con_driver
= ®istered_con_driver
[i
];
3546 /* already registered */
3547 if (con_driver
->con
== csw
)
3554 desc
= csw
->con_startup();
3561 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
3562 con_driver
= ®istered_con_driver
[i
];
3564 if (con_driver
->con
== NULL
) {
3565 con_driver
->con
= csw
;
3566 con_driver
->desc
= desc
;
3567 con_driver
->node
= i
;
3568 con_driver
->flag
= CON_DRIVER_FLAG_MODULE
|
3569 CON_DRIVER_FLAG_INIT
;
3570 con_driver
->first
= first
;
3571 con_driver
->last
= last
;
3580 con_driver
->dev
= device_create(vtconsole_class
, NULL
,
3581 MKDEV(0, con_driver
->node
),
3585 if (IS_ERR(con_driver
->dev
)) {
3586 printk(KERN_WARNING
"Unable to create device for %s; "
3587 "errno = %ld\n", con_driver
->desc
,
3588 PTR_ERR(con_driver
->dev
));
3589 con_driver
->dev
= NULL
;
3591 vtconsole_init_device(con_driver
);
3595 release_console_sem();
3599 EXPORT_SYMBOL(register_con_driver
);
3602 * unregister_con_driver - unregister console driver from console layer
3603 * @csw: console driver
3605 * DESCRIPTION: All drivers that registers to the console layer must
3606 * call this function upon exit, or if the console driver is in a state
3607 * where it won't be able to handle console services, such as the
3608 * framebuffer console without loaded framebuffer drivers.
3610 * The driver must unbind first prior to unregistration.
3612 int unregister_con_driver(const struct consw
*csw
)
3614 int i
, retval
= -ENODEV
;
3616 acquire_console_sem();
3618 /* cannot unregister a bound driver */
3619 if (con_is_bound(csw
))
3622 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
3623 struct con_driver
*con_driver
= ®istered_con_driver
[i
];
3625 if (con_driver
->con
== csw
&&
3626 con_driver
->flag
& CON_DRIVER_FLAG_MODULE
) {
3627 vtconsole_deinit_device(con_driver
);
3628 device_destroy(vtconsole_class
,
3629 MKDEV(0, con_driver
->node
));
3630 con_driver
->con
= NULL
;
3631 con_driver
->desc
= NULL
;
3632 con_driver
->dev
= NULL
;
3633 con_driver
->node
= 0;
3634 con_driver
->flag
= 0;
3635 con_driver
->first
= 0;
3636 con_driver
->last
= 0;
3642 release_console_sem();
3645 EXPORT_SYMBOL(unregister_con_driver
);
3648 * If we support more console drivers, this function is used
3649 * when a driver wants to take over some existing consoles
3650 * and become default driver for newly opened ones.
3652 * take_over_console is basically a register followed by unbind
3654 int take_over_console(const struct consw
*csw
, int first
, int last
, int deflt
)
3658 err
= register_con_driver(csw
, first
, last
);
3661 bind_con_driver(csw
, first
, last
, deflt
);
3667 * give_up_console is a wrapper to unregister_con_driver. It will only
3668 * work if driver is fully unbound.
3670 void give_up_console(const struct consw
*csw
)
3672 unregister_con_driver(csw
);
3675 static int __init
vtconsole_class_init(void)
3679 vtconsole_class
= class_create(THIS_MODULE
, "vtconsole");
3680 if (IS_ERR(vtconsole_class
)) {
3681 printk(KERN_WARNING
"Unable to create vt console class; "
3682 "errno = %ld\n", PTR_ERR(vtconsole_class
));
3683 vtconsole_class
= NULL
;
3686 /* Add system drivers to sysfs */
3687 for (i
= 0; i
< MAX_NR_CON_DRIVER
; i
++) {
3688 struct con_driver
*con
= ®istered_con_driver
[i
];
3690 if (con
->con
&& !con
->dev
) {
3691 con
->dev
= device_create(vtconsole_class
, NULL
,
3692 MKDEV(0, con
->node
),
3696 if (IS_ERR(con
->dev
)) {
3697 printk(KERN_WARNING
"Unable to create "
3698 "device for %s; errno = %ld\n",
3699 con
->desc
, PTR_ERR(con
->dev
));
3702 vtconsole_init_device(con
);
3709 postcore_initcall(vtconsole_class_init
);
3717 static int set_vesa_blanking(char __user
*p
)
3721 if (get_user(mode
, p
+ 1))
3724 vesa_blank_mode
= (mode
< 4) ? mode
: 0;
3728 void do_blank_screen(int entering_gfx
)
3730 struct vc_data
*vc
= vc_cons
[fg_console
].d
;
3733 WARN_CONSOLE_UNLOCKED();
3735 if (console_blanked
) {
3736 if (blank_state
== blank_vesa_wait
) {
3737 blank_state
= blank_off
;
3738 vc
->vc_sw
->con_blank(vc
, vesa_blank_mode
+ 1, 0);
3743 /* entering graphics mode? */
3747 vc
->vc_sw
->con_blank(vc
, -1, 1);
3748 console_blanked
= fg_console
+ 1;
3749 blank_state
= blank_off
;
3754 if (blank_state
!= blank_normal_wait
)
3756 blank_state
= blank_off
;
3758 /* don't blank graphics */
3759 if (vc
->vc_mode
!= KD_TEXT
) {
3760 console_blanked
= fg_console
+ 1;
3765 del_timer_sync(&console_timer
);
3766 blank_timer_expired
= 0;
3769 /* In case we need to reset origin, blanking hook returns 1 */
3770 i
= vc
->vc_sw
->con_blank(vc
, vesa_off_interval
? 1 : (vesa_blank_mode
+ 1), 0);
3771 console_blanked
= fg_console
+ 1;
3775 if (console_blank_hook
&& console_blank_hook(1))
3778 if (vesa_off_interval
&& vesa_blank_mode
) {
3779 blank_state
= blank_vesa_wait
;
3780 mod_timer(&console_timer
, jiffies
+ vesa_off_interval
);
3782 vt_event_post(VT_EVENT_BLANK
, vc
->vc_num
, vc
->vc_num
);
3784 EXPORT_SYMBOL(do_blank_screen
);
3787 * Called by timer as well as from vt_console_driver
3789 void do_unblank_screen(int leaving_gfx
)
3793 /* This should now always be called from a "sane" (read: can schedule)
3794 * context for the sake of the low level drivers, except in the special
3795 * case of oops_in_progress
3797 if (!oops_in_progress
)
3800 WARN_CONSOLE_UNLOCKED();
3803 if (!console_blanked
)
3805 if (!vc_cons_allocated(fg_console
)) {
3807 printk("unblank_screen: tty %d not allocated ??\n", fg_console
+1);
3810 vc
= vc_cons
[fg_console
].d
;
3811 /* Try to unblank in oops case too */
3812 if (vc
->vc_mode
!= KD_TEXT
&& !vt_force_oops_output(vc
))
3813 return; /* but leave console_blanked != 0 */
3815 if (blankinterval
) {
3816 mod_timer(&console_timer
, jiffies
+ (blankinterval
* HZ
));
3817 blank_state
= blank_normal_wait
;
3820 console_blanked
= 0;
3821 if (vc
->vc_sw
->con_blank(vc
, 0, leaving_gfx
) || vt_force_oops_output(vc
))
3822 /* Low-level driver cannot restore -> do it ourselves */
3824 if (console_blank_hook
)
3825 console_blank_hook(0);
3828 vt_event_post(VT_EVENT_UNBLANK
, vc
->vc_num
, vc
->vc_num
);
3830 EXPORT_SYMBOL(do_unblank_screen
);
3833 * This is called by the outside world to cause a forced unblank, mostly for
3834 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3835 * call it with 1 as an argument and so force a mode restore... that may kill
3836 * X or at least garbage the screen but would also make the Oops visible...
3838 void unblank_screen(void)
3840 do_unblank_screen(0);
3844 * We defer the timer blanking to work queue so it can take the console mutex
3845 * (console operations can still happen at irq time, but only from printk which
3846 * has the console mutex. Not perfect yet, but better than no locking
3848 static void blank_screen_t(unsigned long dummy
)
3850 if (unlikely(!keventd_up())) {
3851 mod_timer(&console_timer
, jiffies
+ (blankinterval
* HZ
));
3854 blank_timer_expired
= 1;
3855 schedule_work(&console_work
);
3858 void poke_blanked_console(void)
3860 WARN_CONSOLE_UNLOCKED();
3862 /* Add this so we quickly catch whoever might call us in a non
3863 * safe context. Nowadays, unblank_screen() isn't to be called in
3864 * atomic contexts and is allowed to schedule (with the special case
3865 * of oops_in_progress, but that isn't of any concern for this
3870 /* This isn't perfectly race free, but a race here would be mostly harmless,
3871 * at worse, we'll do a spurrious blank and it's unlikely
3873 del_timer(&console_timer
);
3874 blank_timer_expired
= 0;
3876 if (ignore_poke
|| !vc_cons
[fg_console
].d
|| vc_cons
[fg_console
].d
->vc_mode
== KD_GRAPHICS
)
3878 if (console_blanked
)
3880 else if (blankinterval
) {
3881 mod_timer(&console_timer
, jiffies
+ (blankinterval
* HZ
));
3882 blank_state
= blank_normal_wait
;
3890 static void set_palette(struct vc_data
*vc
)
3892 WARN_CONSOLE_UNLOCKED();
3894 if (vc
->vc_mode
!= KD_GRAPHICS
)
3895 vc
->vc_sw
->con_set_palette(vc
, color_table
);
3898 static int set_get_cmap(unsigned char __user
*arg
, int set
)
3902 WARN_CONSOLE_UNLOCKED();
3904 for (i
= 0; i
< 16; i
++)
3906 get_user(default_red
[i
], arg
++);
3907 get_user(default_grn
[i
], arg
++);
3908 get_user(default_blu
[i
], arg
++);
3910 put_user(default_red
[i
], arg
++);
3911 put_user(default_grn
[i
], arg
++);
3912 put_user(default_blu
[i
], arg
++);
3915 for (i
= 0; i
< MAX_NR_CONSOLES
; i
++)
3916 if (vc_cons_allocated(i
)) {
3917 for (j
= k
= 0; j
< 16; j
++) {
3918 vc_cons
[i
].d
->vc_palette
[k
++] = default_red
[j
];
3919 vc_cons
[i
].d
->vc_palette
[k
++] = default_grn
[j
];
3920 vc_cons
[i
].d
->vc_palette
[k
++] = default_blu
[j
];
3922 set_palette(vc_cons
[i
].d
);
3929 * Load palette into the DAC registers. arg points to a colour
3930 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3933 int con_set_cmap(unsigned char __user
*arg
)
3937 acquire_console_sem();
3938 rc
= set_get_cmap (arg
,1);
3939 release_console_sem();
3944 int con_get_cmap(unsigned char __user
*arg
)
3948 acquire_console_sem();
3949 rc
= set_get_cmap (arg
,0);
3950 release_console_sem();
3955 void reset_palette(struct vc_data
*vc
)
3958 for (j
=k
=0; j
<16; j
++) {
3959 vc
->vc_palette
[k
++] = default_red
[j
];
3960 vc
->vc_palette
[k
++] = default_grn
[j
];
3961 vc
->vc_palette
[k
++] = default_blu
[j
];
3969 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3970 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3971 * depending on width) reserved for each character which is kinda wasty, but
3972 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3973 * is upto the actual low-level console-driver convert data into its favorite
3974 * format (maybe we should add a `fontoffset' field to the `display'
3975 * structure so we won't have to convert the fontdata all the time.
3979 #define max_font_size 65536
3981 static int con_font_get(struct vc_data
*vc
, struct console_font_op
*op
)
3983 struct console_font font
;
3987 if (vc
->vc_mode
!= KD_TEXT
)
3991 font
.data
= kmalloc(max_font_size
, GFP_KERNEL
);
3997 acquire_console_sem();
3998 if (vc
->vc_sw
->con_font_get
)
3999 rc
= vc
->vc_sw
->con_font_get(vc
, &font
);
4002 release_console_sem();
4007 c
= (font
.width
+7)/8 * 32 * font
.charcount
;
4009 if (op
->data
&& font
.charcount
> op
->charcount
)
4011 if (!(op
->flags
& KD_FONT_FLAG_OLD
)) {
4012 if (font
.width
> op
->width
|| font
.height
> op
->height
)
4015 if (font
.width
!= 8)
4017 else if ((op
->height
&& font
.height
> op
->height
) ||
4024 op
->height
= font
.height
;
4025 op
->width
= font
.width
;
4026 op
->charcount
= font
.charcount
;
4028 if (op
->data
&& copy_to_user(op
->data
, font
.data
, c
))
4036 static int con_font_set(struct vc_data
*vc
, struct console_font_op
*op
)
4038 struct console_font font
;
4042 if (vc
->vc_mode
!= KD_TEXT
)
4046 if (op
->charcount
> 512)
4048 if (!op
->height
) { /* Need to guess font height [compat] */
4050 u8 __user
*charmap
= op
->data
;
4053 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4054 so that we can get rid of this soon */
4055 if (!(op
->flags
& KD_FONT_FLAG_OLD
))
4057 for (h
= 32; h
> 0; h
--)
4058 for (i
= 0; i
< op
->charcount
; i
++) {
4059 if (get_user(tmp
, &charmap
[32*i
+h
-1]))
4068 if (op
->width
<= 0 || op
->width
> 32 || op
->height
> 32)
4070 size
= (op
->width
+7)/8 * 32 * op
->charcount
;
4071 if (size
> max_font_size
)
4073 font
.charcount
= op
->charcount
;
4074 font
.height
= op
->height
;
4075 font
.width
= op
->width
;
4076 font
.data
= memdup_user(op
->data
, size
);
4077 if (IS_ERR(font
.data
))
4078 return PTR_ERR(font
.data
);
4079 acquire_console_sem();
4080 if (vc
->vc_sw
->con_font_set
)
4081 rc
= vc
->vc_sw
->con_font_set(vc
, &font
, op
->flags
);
4084 release_console_sem();
4089 static int con_font_default(struct vc_data
*vc
, struct console_font_op
*op
)
4091 struct console_font font
= {.width
= op
->width
, .height
= op
->height
};
4092 char name
[MAX_FONT_NAME
];
4096 if (vc
->vc_mode
!= KD_TEXT
)
4101 else if (strncpy_from_user(name
, op
->data
, MAX_FONT_NAME
- 1) < 0)
4104 name
[MAX_FONT_NAME
- 1] = 0;
4106 acquire_console_sem();
4107 if (vc
->vc_sw
->con_font_default
)
4108 rc
= vc
->vc_sw
->con_font_default(vc
, &font
, s
);
4111 release_console_sem();
4113 op
->width
= font
.width
;
4114 op
->height
= font
.height
;
4119 static int con_font_copy(struct vc_data
*vc
, struct console_font_op
*op
)
4121 int con
= op
->height
;
4124 if (vc
->vc_mode
!= KD_TEXT
)
4127 acquire_console_sem();
4128 if (!vc
->vc_sw
->con_font_copy
)
4130 else if (con
< 0 || !vc_cons_allocated(con
))
4132 else if (con
== vc
->vc_num
) /* nothing to do */
4135 rc
= vc
->vc_sw
->con_font_copy(vc
, con
);
4136 release_console_sem();
4140 int con_font_op(struct vc_data
*vc
, struct console_font_op
*op
)
4143 case KD_FONT_OP_SET
:
4144 return con_font_set(vc
, op
);
4145 case KD_FONT_OP_GET
:
4146 return con_font_get(vc
, op
);
4147 case KD_FONT_OP_SET_DEFAULT
:
4148 return con_font_default(vc
, op
);
4149 case KD_FONT_OP_COPY
:
4150 return con_font_copy(vc
, op
);
4156 * Interface exported to selection and vcs.
4159 /* used by selection */
4160 u16
screen_glyph(struct vc_data
*vc
, int offset
)
4162 u16 w
= scr_readw(screenpos(vc
, offset
, 1));
4165 if (w
& vc
->vc_hi_font_mask
)
4169 EXPORT_SYMBOL_GPL(screen_glyph
);
4171 /* used by vcs - note the word offset */
4172 unsigned short *screen_pos(struct vc_data
*vc
, int w_offset
, int viewed
)
4174 return screenpos(vc
, 2 * w_offset
, viewed
);
4177 void getconsxy(struct vc_data
*vc
, unsigned char *p
)
4183 void putconsxy(struct vc_data
*vc
, unsigned char *p
)
4186 gotoxy(vc
, p
[0], p
[1]);
4190 u16
vcs_scr_readw(struct vc_data
*vc
, const u16
*org
)
4192 if ((unsigned long)org
== vc
->vc_pos
&& softcursor_original
!= -1)
4193 return softcursor_original
;
4194 return scr_readw(org
);
4197 void vcs_scr_writew(struct vc_data
*vc
, u16 val
, u16
*org
)
4199 scr_writew(val
, org
);
4200 if ((unsigned long)org
== vc
->vc_pos
) {
4201 softcursor_original
= -1;
4206 void vcs_scr_updated(struct vc_data
*vc
)
4212 * Visible symbols for modules
4215 EXPORT_SYMBOL(color_table
);
4216 EXPORT_SYMBOL(default_red
);
4217 EXPORT_SYMBOL(default_grn
);
4218 EXPORT_SYMBOL(default_blu
);
4219 EXPORT_SYMBOL(update_region
);
4220 EXPORT_SYMBOL(redraw_screen
);
4221 EXPORT_SYMBOL(vc_resize
);
4222 EXPORT_SYMBOL(fg_console
);
4223 EXPORT_SYMBOL(console_blank_hook
);
4224 EXPORT_SYMBOL(console_blanked
);
4225 EXPORT_SYMBOL(vc_cons
);
4226 EXPORT_SYMBOL(global_cursor_default
);
4227 #ifndef VT_SINGLE_DRIVER
4228 EXPORT_SYMBOL(take_over_console
);
4229 EXPORT_SYMBOL(give_up_console
);