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 * Notifier list for console events.
241 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
243 int register_vt_notifier(struct notifier_block *nb)
245 return atomic_notifier_chain_register(&vt_notifier_list, nb);
247 EXPORT_SYMBOL_GPL(register_vt_notifier);
249 int unregister_vt_notifier(struct notifier_block *nb)
251 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
253 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
255 static void notify_write(struct vc_data *vc, unsigned int unicode)
257 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
258 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
261 static void notify_update(struct vc_data *vc)
263 struct vt_notifier_param param = { .vc = vc };
264 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
267 * Low-Level Functions
270 #define IS_FG(vc) ((vc)->vc_num == fg_console)
272 #ifdef VT_BUF_VRAM_ONLY
273 #define DO_UPDATE(vc) 0
275 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
278 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
283 p = (unsigned short *)(vc->vc_origin + offset);
284 else if (!vc->vc_sw->con_screen_pos)
285 p = (unsigned short *)(vc->vc_visible_origin + offset);
287 p = vc->vc_sw->con_screen_pos(vc, offset);
291 /* Called from the keyboard irq path.. */
292 static inline void scrolldelta(int lines)
295 /* scrolldelta needs some kind of consistency lock, but the BKL was
296 and still is not protecting versus the scheduled back end */
297 scrollback_delta += lines;
298 schedule_console_callback();
301 void schedule_console_callback(void)
303 schedule_work(&console_work);
306 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
308 unsigned short *d, *s;
312 if (b > vc->vc_rows || t >= b || nr < 1)
314 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
316 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
317 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
318 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
319 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
320 vc->vc_size_row * nr);
323 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
330 if (b > vc->vc_rows || t >= b || nr < 1)
332 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
334 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
335 step = vc->vc_cols * nr;
336 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
337 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
340 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
342 #ifndef VT_BUF_VRAM_ONLY
343 unsigned int xx, yy, offset;
347 if (!vc->vc_sw->con_getxy) {
348 offset = (start - vc->vc_origin) / 2;
349 xx = offset % vc->vc_cols;
350 yy = offset / vc->vc_cols;
353 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
357 u16 attrib = scr_readw(p) & 0xff00;
360 while (xx < vc->vc_cols && count) {
361 if (attrib != (scr_readw(p) & 0xff00)) {
363 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
366 attrib = scr_readw(p) & 0xff00;
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (vc->vc_sw->con_getxy) {
380 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
386 void update_region(struct vc_data *vc, unsigned long start, int count)
388 WARN_CONSOLE_UNLOCKED();
392 do_update_region(vc, start, count);
397 /* Structure of attributes is hardware-dependent */
399 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
400 u8 _underline, u8 _reverse, u8 _italic)
402 if (vc->vc_sw->con_build_attr)
403 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
404 _blink, _underline, _reverse, _italic);
406 #ifndef VT_BUF_VRAM_ONLY
408 * ++roman: I completely changed the attribute format for monochrome
409 * mode (!can_do_color). The formerly used MDA (monochrome display
410 * adapter) format didn't allow the combination of certain effects.
411 * Now the attribute is just a bit vector:
412 * Bit 0..1: intensity (0..2)
419 if (!vc->vc_can_do_color)
422 (_underline ? 4 : 0) |
426 a = (a & 0xF0) | vc->vc_itcolor;
428 a = (a & 0xf0) | vc->vc_ulcolor;
429 else if (_intensity == 0)
430 a = (a & 0xf0) | vc->vc_ulcolor;
432 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
437 if (vc->vc_hi_font_mask == 0x100)
446 static void update_attr(struct vc_data *vc)
448 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
449 vc->vc_blink, vc->vc_underline,
450 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
451 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
454 /* Note: inverting the screen twice should revert to the original state */
455 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
459 WARN_CONSOLE_UNLOCKED();
462 p = screenpos(vc, offset, viewed);
463 if (vc->vc_sw->con_invert_region)
464 vc->vc_sw->con_invert_region(vc, p, count);
465 #ifndef VT_BUF_VRAM_ONLY
471 if (!vc->vc_can_do_color) {
478 } else if (vc->vc_hi_font_mask == 0x100) {
481 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
488 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
496 do_update_region(vc, (unsigned long) p, count);
499 /* used by selection: complement pointer position */
500 void complement_pos(struct vc_data *vc, int offset)
502 static int old_offset = -1;
503 static unsigned short old;
504 static unsigned short oldx, oldy;
506 WARN_CONSOLE_UNLOCKED();
508 if (old_offset != -1 && old_offset >= 0 &&
509 old_offset < vc->vc_screenbuf_size) {
510 scr_writew(old, screenpos(vc, old_offset, 1));
512 vc->vc_sw->con_putc(vc, old, oldy, oldx);
517 if (offset != -1 && offset >= 0 &&
518 offset < vc->vc_screenbuf_size) {
521 p = screenpos(vc, offset, 1);
523 new = old ^ vc->vc_complement_mask;
526 oldx = (offset >> 1) % vc->vc_cols;
527 oldy = (offset >> 1) / vc->vc_cols;
528 vc->vc_sw->con_putc(vc, new, oldy, oldx);
534 static void insert_char(struct vc_data *vc, unsigned int nr)
536 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
538 p = q + vc->vc_cols - nr - vc->vc_x;
540 scr_writew(scr_readw(p), p + nr);
541 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
542 vc->vc_need_wrap = 0;
544 unsigned short oldattr = vc->vc_attr;
545 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
546 vc->vc_cols - vc->vc_x - nr);
547 vc->vc_attr = vc->vc_video_erase_char >> 8;
549 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
550 vc->vc_attr = oldattr;
554 static void delete_char(struct vc_data *vc, unsigned int nr)
556 unsigned int i = vc->vc_x;
557 unsigned short *p = (unsigned short *)vc->vc_pos;
559 while (++i <= vc->vc_cols - nr) {
560 scr_writew(scr_readw(p+nr), p);
563 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
564 vc->vc_need_wrap = 0;
566 unsigned short oldattr = vc->vc_attr;
567 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
568 vc->vc_cols - vc->vc_x - nr);
569 vc->vc_attr = vc->vc_video_erase_char >> 8;
571 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
572 vc->vc_cols - 1 - nr);
573 vc->vc_attr = oldattr;
577 static int softcursor_original;
579 static void add_softcursor(struct vc_data *vc)
581 int i = scr_readw((u16 *) vc->vc_pos);
582 u32 type = vc->vc_cursor_type;
584 if (! (type & 0x10)) return;
585 if (softcursor_original != -1) return;
586 softcursor_original = i;
587 i |= ((type >> 8) & 0xff00 );
588 i ^= ((type) & 0xff00 );
589 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
590 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
591 scr_writew(i, (u16 *) vc->vc_pos);
593 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
596 static void hide_softcursor(struct vc_data *vc)
598 if (softcursor_original != -1) {
599 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
601 vc->vc_sw->con_putc(vc, softcursor_original,
603 softcursor_original = -1;
607 static void hide_cursor(struct vc_data *vc)
611 vc->vc_sw->con_cursor(vc, CM_ERASE);
615 static void set_cursor(struct vc_data *vc)
617 if (!IS_FG(vc) || console_blanked ||
618 vc->vc_mode == KD_GRAPHICS)
624 if ((vc->vc_cursor_type & 0x0f) != 1)
625 vc->vc_sw->con_cursor(vc, CM_DRAW);
630 static void set_origin(struct vc_data *vc)
632 WARN_CONSOLE_UNLOCKED();
634 if (!CON_IS_VISIBLE(vc) ||
635 !vc->vc_sw->con_set_origin ||
636 !vc->vc_sw->con_set_origin(vc))
637 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
638 vc->vc_visible_origin = vc->vc_origin;
639 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
640 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
643 static inline void save_screen(struct vc_data *vc)
645 WARN_CONSOLE_UNLOCKED();
647 if (vc->vc_sw->con_save_screen)
648 vc->vc_sw->con_save_screen(vc);
652 * Redrawing of screen
655 static void clear_buffer_attributes(struct vc_data *vc)
657 unsigned short *p = (unsigned short *)vc->vc_origin;
658 int count = vc->vc_screenbuf_size / 2;
659 int mask = vc->vc_hi_font_mask | 0xff;
661 for (; count > 0; count--, p++) {
662 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
666 void redraw_screen(struct vc_data *vc, int is_switch)
670 WARN_CONSOLE_UNLOCKED();
674 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
679 struct vc_data *old_vc = vc_cons[fg_console].d;
682 if (!CON_IS_VISIBLE(vc))
684 *vc->vc_display_fg = vc;
685 fg_console = vc->vc_num;
687 if (!CON_IS_VISIBLE(old_vc)) {
698 int old_was_color = vc->vc_can_do_color;
701 update = vc->vc_sw->con_switch(vc);
704 * If console changed from mono<->color, the best we can do
705 * is to clear the buffer attributes. As it currently stands,
706 * rebuilding new attributes from the old buffer is not doable
707 * without overly complex code.
709 if (old_was_color != vc->vc_can_do_color) {
711 clear_buffer_attributes(vc);
714 /* Forcibly update if we're panicing */
715 if ((update && vc->vc_mode != KD_GRAPHICS) ||
716 vt_force_oops_output(vc))
717 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
722 compute_shiftstate();
728 * Allocation, freeing and resizing of VTs.
731 int vc_cons_allocated(unsigned int i)
733 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
736 static void visual_init(struct vc_data *vc, int num, int init)
738 /* ++Geert: vc->vc_sw->con_init determines console size */
740 module_put(vc->vc_sw->owner);
741 vc->vc_sw = conswitchp;
742 #ifndef VT_SINGLE_DRIVER
743 if (con_driver_map[num])
744 vc->vc_sw = con_driver_map[num];
746 __module_get(vc->vc_sw->owner);
748 vc->vc_display_fg = &master_display_fg;
749 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
750 vc->vc_uni_pagedir = 0;
751 vc->vc_hi_font_mask = 0;
752 vc->vc_complement_mask = 0;
753 vc->vc_can_do_color = 0;
754 vc->vc_panic_force_write = false;
755 vc->vc_sw->con_init(vc, init);
756 if (!vc->vc_complement_mask)
757 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
758 vc->vc_s_complement_mask = vc->vc_complement_mask;
759 vc->vc_size_row = vc->vc_cols << 1;
760 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
763 int vc_allocate(unsigned int currcons) /* return 0 on success */
765 WARN_CONSOLE_UNLOCKED();
767 if (currcons >= MAX_NR_CONSOLES)
769 if (!vc_cons[currcons].d) {
771 struct vt_notifier_param param;
773 /* prevent users from taking too much memory */
774 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
777 /* due to the granularity of kmalloc, we waste some memory here */
778 /* the alloc is done in two steps, to optimize the common situation
779 of a 25x80 console (structsize=216, screenbuf_size=4000) */
780 /* although the numbers above are not valid since long ago, the
781 point is still up-to-date and the comment still has its value
782 even if only as a historical artifact. --mj, July 1998 */
783 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
786 vc_cons[currcons].d = vc;
787 tty_port_init(&vc->port);
788 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
789 visual_init(vc, currcons, 1);
790 if (!*vc->vc_uni_pagedir_loc)
791 con_set_default_unimap(vc);
792 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
793 if (!vc->vc_screenbuf) {
795 vc_cons[currcons].d = NULL;
799 /* If no drivers have overridden us and the user didn't pass a
800 boot option, default to displaying the cursor */
801 if (global_cursor_default == -1)
802 global_cursor_default = 1;
804 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
805 vcs_make_sysfs(currcons);
806 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
811 static inline int resize_screen(struct vc_data *vc, int width, int height,
814 /* Resizes the resolution of the display adapater */
817 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
818 err = vc->vc_sw->con_resize(vc, width, height, user);
824 * Change # of rows and columns (0 means unchanged/the size of fg_console)
825 * [this is to be used together with some user program
826 * like resize that changes the hardware videomode]
828 #define VC_RESIZE_MAXCOL (32767)
829 #define VC_RESIZE_MAXROW (32767)
832 * vc_do_resize - resizing method for the tty
833 * @tty: tty being resized
834 * @real_tty: real tty (different to tty if a pty/tty pair)
835 * @vc: virtual console private data
839 * Resize a virtual console, clipping according to the actual constraints.
840 * If the caller passes a tty structure then update the termios winsize
841 * information and perform any necessary signal handling.
843 * Caller must hold the console semaphore. Takes the termios mutex and
844 * ctrl_lock of the tty IFF a tty is passed.
847 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
848 unsigned int cols, unsigned int lines)
850 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
852 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
853 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
855 unsigned short *newscreen;
857 WARN_CONSOLE_UNLOCKED();
862 user = vc->vc_resize_user;
863 vc->vc_resize_user = 0;
865 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
868 new_cols = (cols ? cols : vc->vc_cols);
869 new_rows = (lines ? lines : vc->vc_rows);
870 new_row_size = new_cols << 1;
871 new_screen_size = new_row_size * new_rows;
873 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
876 newscreen = kmalloc(new_screen_size, GFP_USER);
880 old_rows = vc->vc_rows;
881 old_cols = vc->vc_cols;
882 old_row_size = vc->vc_size_row;
883 old_screen_size = vc->vc_screenbuf_size;
885 err = resize_screen(vc, new_cols, new_rows, user);
891 vc->vc_rows = new_rows;
892 vc->vc_cols = new_cols;
893 vc->vc_size_row = new_row_size;
894 vc->vc_screenbuf_size = new_screen_size;
896 rlth = min(old_row_size, new_row_size);
897 rrem = new_row_size - rlth;
898 old_origin = vc->vc_origin;
899 new_origin = (long) newscreen;
900 new_scr_end = new_origin + new_screen_size;
902 if (vc->vc_y > new_rows) {
903 if (old_rows - vc->vc_y < new_rows) {
905 * Cursor near the bottom, copy contents from the
908 old_origin += (old_rows - new_rows) * old_row_size;
909 end = vc->vc_scr_end;
912 * Cursor is in no man's land, copy 1/2 screenful
913 * from the top and bottom of cursor position
915 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
916 end = old_origin + (old_row_size * new_rows);
920 * Cursor near the top, copy contents from the top of buffer
922 end = (old_rows > new_rows) ? old_origin +
923 (old_row_size * new_rows) :
928 while (old_origin < end) {
929 scr_memcpyw((unsigned short *) new_origin,
930 (unsigned short *) old_origin, rlth);
932 scr_memsetw((void *)(new_origin + rlth),
933 vc->vc_video_erase_char, rrem);
934 old_origin += old_row_size;
935 new_origin += new_row_size;
937 if (new_scr_end > new_origin)
938 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
939 new_scr_end - new_origin);
940 kfree(vc->vc_screenbuf);
941 vc->vc_screenbuf = newscreen;
942 vc->vc_screenbuf_size = new_screen_size;
945 /* do part of a reset_terminal() */
947 vc->vc_bottom = vc->vc_rows;
948 gotoxy(vc, vc->vc_x, vc->vc_y);
952 /* Rewrite the requested winsize data with the actual
955 memset(&ws, 0, sizeof(ws));
956 ws.ws_row = vc->vc_rows;
957 ws.ws_col = vc->vc_cols;
958 ws.ws_ypixel = vc->vc_scan_lines;
959 tty_do_resize(tty, &ws);
962 if (CON_IS_VISIBLE(vc))
964 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
969 * vc_resize - resize a VT
970 * @vc: virtual console
974 * Resize a virtual console as seen from the console end of things. We
975 * use the common vc_do_resize methods to update the structures. The
976 * caller must hold the console sem to protect console internals and
980 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
982 return vc_do_resize(vc->port.tty, vc, cols, rows);
986 * vt_resize - resize a VT
987 * @tty: tty to resize
988 * @ws: winsize attributes
990 * Resize a virtual terminal. This is called by the tty layer as we
991 * register our own handler for resizing. The mutual helper does all
994 * Takes the console sem and the called methods then take the tty
995 * termios_mutex and the tty ctrl_lock in that order.
997 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
999 struct vc_data *vc = tty->driver_data;
1002 acquire_console_sem();
1003 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1004 release_console_sem();
1008 void vc_deallocate(unsigned int currcons)
1010 WARN_CONSOLE_UNLOCKED();
1012 if (vc_cons_allocated(currcons)) {
1013 struct vc_data *vc = vc_cons[currcons].d;
1014 struct vt_notifier_param param = { .vc = vc };
1016 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1017 vcs_remove_sysfs(currcons);
1018 vc->vc_sw->con_deinit(vc);
1019 put_pid(vc->vt_pid);
1020 module_put(vc->vc_sw->owner);
1021 kfree(vc->vc_screenbuf);
1022 if (currcons >= MIN_NR_CONSOLES)
1024 vc_cons[currcons].d = NULL;
1032 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1033 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1034 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1036 #define decarm VC_REPEAT
1037 #define decckm VC_CKMODE
1038 #define kbdapplic VC_APPLIC
1042 * this is what the terminal answers to a ESC-Z or csi0c query.
1044 #define VT100ID "\033[?1;2c"
1045 #define VT102ID "\033[?6c"
1047 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1048 8,12,10,14, 9,13,11,15 };
1050 /* the default colour table, for VGA+ colour systems */
1051 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1052 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1053 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1054 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1055 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1056 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1058 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1059 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1060 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1063 * gotoxy() must verify all boundaries, because the arguments
1064 * might also be negative. If the given position is out of
1065 * bounds, the cursor is placed at the nearest margin.
1067 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1074 if (new_x >= vc->vc_cols)
1075 vc->vc_x = vc->vc_cols - 1;
1082 max_y = vc->vc_bottom;
1085 max_y = vc->vc_rows;
1089 else if (new_y >= max_y)
1090 vc->vc_y = max_y - 1;
1093 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1094 vc->vc_need_wrap = 0;
1097 /* for absolute user moves, when decom is set */
1098 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1100 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1103 void scrollback(struct vc_data *vc, int lines)
1106 lines = vc->vc_rows / 2;
1107 scrolldelta(-lines);
1110 void scrollfront(struct vc_data *vc, int lines)
1113 lines = vc->vc_rows / 2;
1117 static void lf(struct vc_data *vc)
1119 /* don't scroll if above bottom of scrolling region, or
1120 * if below scrolling region
1122 if (vc->vc_y + 1 == vc->vc_bottom)
1123 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1124 else if (vc->vc_y < vc->vc_rows - 1) {
1126 vc->vc_pos += vc->vc_size_row;
1128 vc->vc_need_wrap = 0;
1129 notify_write(vc, '\n');
1132 static void ri(struct vc_data *vc)
1134 /* don't scroll if below top of scrolling region, or
1135 * if above scrolling region
1137 if (vc->vc_y == vc->vc_top)
1138 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1139 else if (vc->vc_y > 0) {
1141 vc->vc_pos -= vc->vc_size_row;
1143 vc->vc_need_wrap = 0;
1146 static inline void cr(struct vc_data *vc)
1148 vc->vc_pos -= vc->vc_x << 1;
1149 vc->vc_need_wrap = vc->vc_x = 0;
1150 notify_write(vc, '\r');
1153 static inline void bs(struct vc_data *vc)
1158 vc->vc_need_wrap = 0;
1159 notify_write(vc, '\b');
1163 static inline void del(struct vc_data *vc)
1168 static void csi_J(struct vc_data *vc, int vpar)
1171 unsigned short * start;
1174 case 0: /* erase from cursor to end of display */
1175 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1176 start = (unsigned short *)vc->vc_pos;
1177 if (DO_UPDATE(vc)) {
1178 /* do in two stages */
1179 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1180 vc->vc_cols - vc->vc_x);
1181 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1182 vc->vc_rows - vc->vc_y - 1,
1186 case 1: /* erase from start to cursor */
1187 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1188 start = (unsigned short *)vc->vc_origin;
1189 if (DO_UPDATE(vc)) {
1190 /* do in two stages */
1191 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1193 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1197 case 2: /* erase whole display */
1198 count = vc->vc_cols * vc->vc_rows;
1199 start = (unsigned short *)vc->vc_origin;
1201 vc->vc_sw->con_clear(vc, 0, 0,
1208 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1209 vc->vc_need_wrap = 0;
1212 static void csi_K(struct vc_data *vc, int vpar)
1215 unsigned short * start;
1218 case 0: /* erase from cursor to end of line */
1219 count = vc->vc_cols - vc->vc_x;
1220 start = (unsigned short *)vc->vc_pos;
1222 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1223 vc->vc_cols - vc->vc_x);
1225 case 1: /* erase from start of line to cursor */
1226 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1227 count = vc->vc_x + 1;
1229 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1232 case 2: /* erase whole line */
1233 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1234 count = vc->vc_cols;
1236 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1242 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1243 vc->vc_need_wrap = 0;
1246 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1252 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1254 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1256 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1257 vc->vc_need_wrap = 0;
1260 static void default_attr(struct vc_data *vc)
1262 vc->vc_intensity = 1;
1264 vc->vc_underline = 0;
1267 vc->vc_color = vc->vc_def_color;
1270 /* console_sem is held */
1271 static void csi_m(struct vc_data *vc)
1275 for (i = 0; i <= vc->vc_npar; i++)
1276 switch (vc->vc_par[i]) {
1277 case 0: /* all attributes off */
1281 vc->vc_intensity = 2;
1284 vc->vc_intensity = 0;
1290 vc->vc_underline = 1;
1298 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1299 * Select primary font, don't display
1300 * control chars if defined, don't set
1303 vc->vc_translate = set_translate(vc->vc_charset == 0
1305 : vc->vc_G1_charset, vc);
1306 vc->vc_disp_ctrl = 0;
1307 vc->vc_toggle_meta = 0;
1309 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1310 * Select first alternate font, lets
1311 * chars < 32 be displayed as ROM chars.
1313 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1314 vc->vc_disp_ctrl = 1;
1315 vc->vc_toggle_meta = 0;
1317 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1318 * Select second alternate font, toggle
1319 * high bit before displaying as ROM char.
1321 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1322 vc->vc_disp_ctrl = 1;
1323 vc->vc_toggle_meta = 1;
1327 vc->vc_intensity = 1;
1333 vc->vc_underline = 0;
1341 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1342 * Enables underscore, white foreground
1343 * with white underscore (Linux - use
1344 * default foreground).
1346 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1347 vc->vc_underline = 1;
1349 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1350 * Disable underline option.
1351 * Reset colour to default? It did this
1354 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1355 vc->vc_underline = 0;
1358 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1361 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1362 vc->vc_color = color_table[vc->vc_par[i] - 30]
1363 | (vc->vc_color & 0xf0);
1364 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1365 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1366 | (vc->vc_color & 0x0f);
1372 static void respond_string(const char *p, struct tty_struct *tty)
1375 tty_insert_flip_char(tty, *p, 0);
1378 con_schedule_flip(tty);
1381 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1385 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1386 respond_string(buf, tty);
1389 static inline void status_report(struct tty_struct *tty)
1391 respond_string("\033[0n", tty); /* Terminal ok */
1394 static inline void respond_ID(struct tty_struct * tty)
1396 respond_string(VT102ID, tty);
1399 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1403 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1405 respond_string(buf, tty);
1408 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1409 int mouse_reporting(void)
1411 return vc_cons[fg_console].d->vc_report_mouse;
1414 /* console_sem is held */
1415 static void set_mode(struct vc_data *vc, int on_off)
1419 for (i = 0; i <= vc->vc_npar; i++)
1421 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1422 case 1: /* Cursor keys send ^[Ox/^[[x */
1424 set_kbd(vc, decckm);
1426 clr_kbd(vc, decckm);
1428 case 3: /* 80/132 mode switch unimplemented */
1429 vc->vc_deccolm = on_off;
1431 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1432 /* this alone does not suffice; some user mode
1433 utility has to change the hardware regs */
1436 case 5: /* Inverted screen on/off */
1437 if (vc->vc_decscnm != on_off) {
1438 vc->vc_decscnm = on_off;
1439 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1443 case 6: /* Origin relative/absolute */
1444 vc->vc_decom = on_off;
1447 case 7: /* Autowrap on/off */
1448 vc->vc_decawm = on_off;
1450 case 8: /* Autorepeat on/off */
1452 set_kbd(vc, decarm);
1454 clr_kbd(vc, decarm);
1457 vc->vc_report_mouse = on_off ? 1 : 0;
1459 case 25: /* Cursor on/off */
1460 vc->vc_deccm = on_off;
1463 vc->vc_report_mouse = on_off ? 2 : 0;
1467 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1468 case 3: /* Monitor (display ctrls) */
1469 vc->vc_disp_ctrl = on_off;
1471 case 4: /* Insert Mode on/off */
1472 vc->vc_decim = on_off;
1474 case 20: /* Lf, Enter == CrLf/Lf */
1484 /* console_sem is held */
1485 static void setterm_command(struct vc_data *vc)
1487 switch(vc->vc_par[0]) {
1488 case 1: /* set color for underline mode */
1489 if (vc->vc_can_do_color &&
1490 vc->vc_par[1] < 16) {
1491 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1492 if (vc->vc_underline)
1496 case 2: /* set color for half intensity mode */
1497 if (vc->vc_can_do_color &&
1498 vc->vc_par[1] < 16) {
1499 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1500 if (vc->vc_intensity == 0)
1504 case 8: /* store colors as defaults */
1505 vc->vc_def_color = vc->vc_attr;
1506 if (vc->vc_hi_font_mask == 0x100)
1507 vc->vc_def_color >>= 1;
1511 case 9: /* set blanking interval */
1512 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1513 poke_blanked_console();
1515 case 10: /* set bell frequency in Hz */
1516 if (vc->vc_npar >= 1)
1517 vc->vc_bell_pitch = vc->vc_par[1];
1519 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1521 case 11: /* set bell duration in msec */
1522 if (vc->vc_npar >= 1)
1523 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1524 vc->vc_par[1] * HZ / 1000 : 0;
1526 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1528 case 12: /* bring specified console to the front */
1529 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1530 set_console(vc->vc_par[1] - 1);
1532 case 13: /* unblank the screen */
1533 poke_blanked_console();
1535 case 14: /* set vesa powerdown interval */
1536 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1538 case 15: /* activate the previous console */
1539 set_console(last_console);
1544 /* console_sem is held */
1545 static void csi_at(struct vc_data *vc, unsigned int nr)
1547 if (nr > vc->vc_cols - vc->vc_x)
1548 nr = vc->vc_cols - vc->vc_x;
1551 insert_char(vc, nr);
1554 /* console_sem is held */
1555 static void csi_L(struct vc_data *vc, unsigned int nr)
1557 if (nr > vc->vc_rows - vc->vc_y)
1558 nr = vc->vc_rows - vc->vc_y;
1561 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1562 vc->vc_need_wrap = 0;
1565 /* console_sem is held */
1566 static void csi_P(struct vc_data *vc, unsigned int nr)
1568 if (nr > vc->vc_cols - vc->vc_x)
1569 nr = vc->vc_cols - vc->vc_x;
1572 delete_char(vc, nr);
1575 /* console_sem is held */
1576 static void csi_M(struct vc_data *vc, unsigned int nr)
1578 if (nr > vc->vc_rows - vc->vc_y)
1579 nr = vc->vc_rows - vc->vc_y;
1582 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1583 vc->vc_need_wrap = 0;
1586 /* console_sem is held (except via vc_init->reset_terminal */
1587 static void save_cur(struct vc_data *vc)
1589 vc->vc_saved_x = vc->vc_x;
1590 vc->vc_saved_y = vc->vc_y;
1591 vc->vc_s_intensity = vc->vc_intensity;
1592 vc->vc_s_italic = vc->vc_italic;
1593 vc->vc_s_underline = vc->vc_underline;
1594 vc->vc_s_blink = vc->vc_blink;
1595 vc->vc_s_reverse = vc->vc_reverse;
1596 vc->vc_s_charset = vc->vc_charset;
1597 vc->vc_s_color = vc->vc_color;
1598 vc->vc_saved_G0 = vc->vc_G0_charset;
1599 vc->vc_saved_G1 = vc->vc_G1_charset;
1602 /* console_sem is held */
1603 static void restore_cur(struct vc_data *vc)
1605 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1606 vc->vc_intensity = vc->vc_s_intensity;
1607 vc->vc_italic = vc->vc_s_italic;
1608 vc->vc_underline = vc->vc_s_underline;
1609 vc->vc_blink = vc->vc_s_blink;
1610 vc->vc_reverse = vc->vc_s_reverse;
1611 vc->vc_charset = vc->vc_s_charset;
1612 vc->vc_color = vc->vc_s_color;
1613 vc->vc_G0_charset = vc->vc_saved_G0;
1614 vc->vc_G1_charset = vc->vc_saved_G1;
1615 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1617 vc->vc_need_wrap = 0;
1620 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1621 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1624 /* console_sem is held (except via vc_init()) */
1625 static void reset_terminal(struct vc_data *vc, int do_clear)
1628 vc->vc_bottom = vc->vc_rows;
1629 vc->vc_state = ESnormal;
1631 vc->vc_translate = set_translate(LAT1_MAP, vc);
1632 vc->vc_G0_charset = LAT1_MAP;
1633 vc->vc_G1_charset = GRAF_MAP;
1635 vc->vc_need_wrap = 0;
1636 vc->vc_report_mouse = 0;
1637 vc->vc_utf = default_utf8;
1638 vc->vc_utf_count = 0;
1640 vc->vc_disp_ctrl = 0;
1641 vc->vc_toggle_meta = 0;
1646 vc->vc_deccm = global_cursor_default;
1649 set_kbd(vc, decarm);
1650 clr_kbd(vc, decckm);
1651 clr_kbd(vc, kbdapplic);
1653 kbd_table[vc->vc_num].lockstate = 0;
1654 kbd_table[vc->vc_num].slockstate = 0;
1655 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1656 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1657 /* do not do set_leds here because this causes an endless tasklet loop
1658 when the keyboard hasn't been initialized yet */
1660 vc->vc_cursor_type = cur_default;
1661 vc->vc_complement_mask = vc->vc_s_complement_mask;
1666 vc->vc_tab_stop[0] = 0x01010100;
1667 vc->vc_tab_stop[1] =
1668 vc->vc_tab_stop[2] =
1669 vc->vc_tab_stop[3] =
1670 vc->vc_tab_stop[4] =
1671 vc->vc_tab_stop[5] =
1672 vc->vc_tab_stop[6] =
1673 vc->vc_tab_stop[7] = 0x01010101;
1675 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1676 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1684 /* console_sem is held */
1685 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1688 * Control characters can be used in the _middle_
1689 * of an escape sequence.
1695 if (vc->vc_bell_duration)
1696 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1702 vc->vc_pos -= (vc->vc_x << 1);
1703 while (vc->vc_x < vc->vc_cols - 1) {
1705 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1708 vc->vc_pos += (vc->vc_x << 1);
1709 notify_write(vc, '\t');
1711 case 10: case 11: case 12:
1713 if (!is_kbd(vc, lnm))
1720 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1721 vc->vc_disp_ctrl = 1;
1725 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1726 vc->vc_disp_ctrl = 0;
1729 vc->vc_state = ESnormal;
1732 vc->vc_state = ESesc;
1738 vc->vc_state = ESsquare;
1741 switch(vc->vc_state) {
1743 vc->vc_state = ESnormal;
1746 vc->vc_state = ESsquare;
1749 vc->vc_state = ESnonstd;
1752 vc->vc_state = ESpercent;
1765 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1777 vc->vc_state = ESsetG0;
1780 vc->vc_state = ESsetG1;
1783 vc->vc_state = EShash;
1786 reset_terminal(vc, 1);
1788 case '>': /* Numeric keypad */
1789 clr_kbd(vc, kbdapplic);
1791 case '=': /* Appl. keypad */
1792 set_kbd(vc, kbdapplic);
1797 if (c=='P') { /* palette escape sequence */
1798 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1799 vc->vc_par[vc->vc_npar] = 0;
1801 vc->vc_state = ESpalette;
1803 } else if (c=='R') { /* reset palette */
1805 vc->vc_state = ESnormal;
1807 vc->vc_state = ESnormal;
1811 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1812 if (vc->vc_npar == 7) {
1813 int i = vc->vc_par[0] * 3, j = 1;
1814 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1815 vc->vc_palette[i++] += vc->vc_par[j++];
1816 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1817 vc->vc_palette[i++] += vc->vc_par[j++];
1818 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1819 vc->vc_palette[i] += vc->vc_par[j];
1821 vc->vc_state = ESnormal;
1824 vc->vc_state = ESnormal;
1827 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1828 vc->vc_par[vc->vc_npar] = 0;
1830 vc->vc_state = ESgetpars;
1831 if (c == '[') { /* Function key */
1832 vc->vc_state=ESfunckey;
1835 vc->vc_ques = (c == '?');
1839 if (c == ';' && vc->vc_npar < NPAR - 1) {
1842 } else if (c>='0' && c<='9') {
1843 vc->vc_par[vc->vc_npar] *= 10;
1844 vc->vc_par[vc->vc_npar] += c - '0';
1847 vc->vc_state = ESgotpars;
1849 vc->vc_state = ESnormal;
1860 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1862 vc->vc_cursor_type = cur_default;
1870 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1872 vc->vc_complement_mask = vc->vc_s_complement_mask;
1878 if (vc->vc_par[0] == 5)
1880 else if (vc->vc_par[0] == 6)
1881 cursor_report(vc, tty);
1893 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1898 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1903 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1908 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1913 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1918 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1923 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1928 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1935 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1938 csi_J(vc, vc->vc_par[0]);
1941 csi_K(vc, vc->vc_par[0]);
1944 csi_L(vc, vc->vc_par[0]);
1947 csi_M(vc, vc->vc_par[0]);
1950 csi_P(vc, vc->vc_par[0]);
1958 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1959 else if (vc->vc_par[0] == 3) {
1960 vc->vc_tab_stop[0] =
1961 vc->vc_tab_stop[1] =
1962 vc->vc_tab_stop[2] =
1963 vc->vc_tab_stop[3] =
1964 vc->vc_tab_stop[4] =
1965 vc->vc_tab_stop[5] =
1966 vc->vc_tab_stop[6] =
1967 vc->vc_tab_stop[7] = 0;
1973 case 'q': /* DECLL - but only 3 leds */
1974 /* map 0,1,2,3 to 0,1,2,4 */
1975 if (vc->vc_par[0] < 4)
1976 setledstate(kbd_table + vc->vc_num,
1977 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1983 vc->vc_par[1] = vc->vc_rows;
1984 /* Minimum allowed region is 2 lines */
1985 if (vc->vc_par[0] < vc->vc_par[1] &&
1986 vc->vc_par[1] <= vc->vc_rows) {
1987 vc->vc_top = vc->vc_par[0] - 1;
1988 vc->vc_bottom = vc->vc_par[1];
1999 csi_X(vc, vc->vc_par[0]);
2002 csi_at(vc, vc->vc_par[0]);
2004 case ']': /* setterm functions */
2005 setterm_command(vc);
2010 vc->vc_state = ESnormal;
2012 case '@': /* defined in ISO 2022 */
2015 case 'G': /* prelim official escape code */
2016 case '8': /* retained for compatibility */
2022 vc->vc_state = ESnormal;
2025 vc->vc_state = ESnormal;
2027 /* DEC screen alignment test. kludge :-) */
2028 vc->vc_video_erase_char =
2029 (vc->vc_video_erase_char & 0xff00) | 'E';
2031 vc->vc_video_erase_char =
2032 (vc->vc_video_erase_char & 0xff00) | ' ';
2033 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2038 vc->vc_G0_charset = GRAF_MAP;
2040 vc->vc_G0_charset = LAT1_MAP;
2042 vc->vc_G0_charset = IBMPC_MAP;
2044 vc->vc_G0_charset = USER_MAP;
2045 if (vc->vc_charset == 0)
2046 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2047 vc->vc_state = ESnormal;
2051 vc->vc_G1_charset = GRAF_MAP;
2053 vc->vc_G1_charset = LAT1_MAP;
2055 vc->vc_G1_charset = IBMPC_MAP;
2057 vc->vc_G1_charset = USER_MAP;
2058 if (vc->vc_charset == 1)
2059 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2060 vc->vc_state = ESnormal;
2063 vc->vc_state = ESnormal;
2067 /* This is a temporary buffer used to prepare a tty console write
2068 * so that we can easily avoid touching user space while holding the
2069 * console spinlock. It is allocated in con_init and is shared by
2070 * this code and the vc_screen read/write tty calls.
2072 * We have to allocate this statically in the kernel data section
2073 * since console_init (and thus con_init) are called before any
2074 * kernel memory allocation is available.
2076 char con_buf[CON_BUF_SIZE];
2077 DEFINE_MUTEX(con_buf_mtx);
2079 /* is_double_width() is based on the wcwidth() implementation by
2080 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2081 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2088 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2093 if (ucs < table[0].first || ucs > table[max].last)
2095 while (max >= min) {
2096 mid = (min + max) / 2;
2097 if (ucs > table[mid].last)
2099 else if (ucs < table[mid].first)
2107 static int is_double_width(uint32_t ucs)
2109 static const struct interval double_width[] = {
2110 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2111 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2112 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2113 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2115 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2118 /* acquires console_sem */
2119 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2121 #ifdef VT_BUF_VRAM_ONLY
2122 #define FLUSH do { } while(0);
2124 #define FLUSH if (draw_x >= 0) { \
2125 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2130 int c, tc, ok, n = 0, draw_x = -1;
2131 unsigned int currcons;
2132 unsigned long draw_from = 0, draw_to = 0;
2134 unsigned char vc_attr;
2135 struct vt_notifier_param param;
2139 u16 himask, charmask;
2146 acquire_console_sem();
2147 vc = tty->driver_data;
2149 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2150 release_console_sem();
2154 currcons = vc->vc_num;
2155 if (!vc_cons_allocated(currcons)) {
2156 /* could this happen? */
2157 printk_once("con_write: tty %d not allocated\n", currcons+1);
2158 release_console_sem();
2162 himask = vc->vc_hi_font_mask;
2163 charmask = himask ? 0x1ff : 0xff;
2165 /* undraw cursor first */
2171 while (!tty->stopped && count) {
2181 /* Do no translation at all in control states */
2182 if (vc->vc_state != ESnormal) {
2184 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2185 /* Combine UTF-8 into Unicode in vc_utf_char.
2186 * vc_utf_count is the number of continuation bytes still
2187 * expected to arrive.
2188 * vc_npar is the number of continuation bytes arrived so
2192 if ((c & 0xc0) == 0x80) {
2193 /* Continuation byte received */
2194 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2195 if (vc->vc_utf_count) {
2196 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2198 if (--vc->vc_utf_count) {
2199 /* Still need some bytes */
2202 /* Got a whole character */
2203 c = vc->vc_utf_char;
2204 /* Reject overlong sequences */
2205 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2206 c > utf8_length_changes[vc->vc_npar])
2209 /* Unexpected continuation byte */
2210 vc->vc_utf_count = 0;
2214 /* Single ASCII byte or first byte of a sequence received */
2215 if (vc->vc_utf_count) {
2216 /* Continuation byte expected */
2218 vc->vc_utf_count = 0;
2220 } else if (c > 0x7f) {
2221 /* First byte of a multibyte sequence received */
2223 if ((c & 0xe0) == 0xc0) {
2224 vc->vc_utf_count = 1;
2225 vc->vc_utf_char = (c & 0x1f);
2226 } else if ((c & 0xf0) == 0xe0) {
2227 vc->vc_utf_count = 2;
2228 vc->vc_utf_char = (c & 0x0f);
2229 } else if ((c & 0xf8) == 0xf0) {
2230 vc->vc_utf_count = 3;
2231 vc->vc_utf_char = (c & 0x07);
2232 } else if ((c & 0xfc) == 0xf8) {
2233 vc->vc_utf_count = 4;
2234 vc->vc_utf_char = (c & 0x03);
2235 } else if ((c & 0xfe) == 0xfc) {
2236 vc->vc_utf_count = 5;
2237 vc->vc_utf_char = (c & 0x01);
2239 /* 254 and 255 are invalid */
2242 if (vc->vc_utf_count) {
2243 /* Still need some bytes */
2247 /* Nothing to do if an ASCII byte was received */
2249 /* End of UTF-8 decoding. */
2250 /* c is the received character, or U+FFFD for invalid sequences. */
2251 /* Replace invalid Unicode code points with U+FFFD too */
2252 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2255 } else { /* no utf or alternate charset mode */
2256 tc = vc_translate(vc, c);
2260 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2261 ¶m) == NOTIFY_STOP)
2264 /* If the original code was a control character we
2265 * only allow a glyph to be displayed if the code is
2266 * not normally used (such as for cursor movement) or
2267 * if the disp_ctrl mode has been explicitly enabled.
2268 * Certain characters (as given by the CTRL_ALWAYS
2269 * bitmap) are always displayed as control characters,
2270 * as the console would be pretty useless without
2271 * them; to display an arbitrary font position use the
2272 * direct-to-font zone in UTF-8 mode.
2274 ok = tc && (c >= 32 ||
2275 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2276 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2277 && (c != 127 || vc->vc_disp_ctrl)
2280 if (vc->vc_state == ESnormal && ok) {
2281 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2282 if (is_double_width(c))
2285 /* Now try to find out how to display it */
2286 tc = conv_uni_to_pc(vc, tc);
2287 if (tc & ~charmask) {
2288 if (tc == -1 || tc == -2) {
2289 continue; /* nothing to display */
2291 /* Glyph not found */
2292 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2293 /* In legacy mode use the glyph we get by a 1:1 mapping.
2294 This would make absolutely no sense with Unicode in mind,
2295 but do this for ASCII characters since a font may lack
2296 Unicode mapping info and we don't want to end up with
2297 having question marks only. */
2300 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2301 tc = conv_uni_to_pc(vc, 0xfffd);
2304 tc = conv_uni_to_pc(vc, '?');
2305 if (tc < 0) tc = '?';
2311 vc_attr = vc->vc_attr;
2313 /* invert vc_attr */
2314 if (!vc->vc_can_do_color) {
2315 vc_attr = (vc->vc_attr) ^ 0x08;
2316 } else if (vc->vc_hi_font_mask == 0x100) {
2317 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2319 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2325 if (vc->vc_need_wrap || vc->vc_decim)
2327 if (vc->vc_need_wrap) {
2334 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2335 (vc_attr << 8) + tc,
2336 (u16 *) vc->vc_pos);
2337 if (DO_UPDATE(vc) && draw_x < 0) {
2339 draw_from = vc->vc_pos;
2341 if (vc->vc_x == vc->vc_cols - 1) {
2342 vc->vc_need_wrap = vc->vc_decawm;
2343 draw_to = vc->vc_pos + 2;
2346 draw_to = (vc->vc_pos += 2);
2349 if (!--width) break;
2351 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2352 if (tc < 0) tc = ' ';
2354 notify_write(vc, c);
2365 goto rescan_last_byte;
2370 do_con_trol(tty, vc, orig);
2373 console_conditional_schedule();
2374 release_console_sem();
2381 * This is the console switching callback.
2383 * Doing console switching in a process context allows
2384 * us to do the switches asynchronously (needed when we want
2385 * to switch due to a keyboard interrupt). Synchronization
2386 * with other console code and prevention of re-entrancy is
2387 * ensured with console_sem.
2389 static void console_callback(struct work_struct *ignored)
2391 acquire_console_sem();
2393 if (want_console >= 0) {
2394 if (want_console != fg_console &&
2395 vc_cons_allocated(want_console)) {
2396 hide_cursor(vc_cons[fg_console].d);
2397 change_console(vc_cons[want_console].d);
2398 /* we only changed when the console had already
2399 been allocated - a new console is not created
2400 in an interrupt routine */
2404 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2405 do_poke_blanked_console = 0;
2406 poke_blanked_console();
2408 if (scrollback_delta) {
2409 struct vc_data *vc = vc_cons[fg_console].d;
2411 if (vc->vc_mode == KD_TEXT)
2412 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2413 scrollback_delta = 0;
2415 if (blank_timer_expired) {
2417 blank_timer_expired = 0;
2419 notify_update(vc_cons[fg_console].d);
2421 release_console_sem();
2424 int set_console(int nr)
2426 struct vc_data *vc = vc_cons[fg_console].d;
2428 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2429 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2432 * Console switch will fail in console_callback() or
2433 * change_console() so there is no point scheduling
2436 * Existing set_console() users don't check the return
2437 * value so this shouldn't break anything
2443 schedule_console_callback();
2448 struct tty_driver *console_driver;
2450 #ifdef CONFIG_VT_CONSOLE
2453 * vt_kmsg_redirect() - Sets/gets the kernel message console
2454 * @new: The new virtual terminal number or -1 if the console should stay
2457 * By default, the kernel messages are always printed on the current virtual
2458 * console. However, the user may modify that default with the
2459 * TIOCL_SETKMSGREDIRECT ioctl call.
2461 * This function sets the kernel message console to be @new. It returns the old
2462 * virtual console number. The virtual terminal number 0 (both as parameter and
2463 * return value) means no redirection (i.e. always printed on the currently
2466 * The parameter -1 means that only the current console is returned, but the
2467 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2468 * case to make the code more understandable.
2470 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2471 * the parameter and always returns 0.
2473 int vt_kmsg_redirect(int new)
2475 static int kmsg_con;
2478 return xchg(&kmsg_con, new);
2484 * Console on virtual terminal
2486 * The console must be locked when we get here.
2489 static void vt_console_print(struct console *co, const char *b, unsigned count)
2491 struct vc_data *vc = vc_cons[fg_console].d;
2493 static DEFINE_SPINLOCK(printing_lock);
2494 const ushort *start;
2499 /* console busy or not yet initialized */
2502 if (!spin_trylock(&printing_lock))
2505 kmsg_console = vt_get_kmsg_redirect();
2506 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2507 vc = vc_cons[kmsg_console - 1].d;
2509 /* read `x' only after setting currcons properly (otherwise
2510 the `x' macro will read the x of the foreground console). */
2513 if (!vc_cons_allocated(fg_console)) {
2515 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2519 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2522 /* undraw cursor first */
2526 start = (ushort *)vc->vc_pos;
2528 /* Contrived structure to try to emulate original need_wrap behaviour
2529 * Problems caused when we have need_wrap set on '\n' character */
2532 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2534 if (CON_IS_VISIBLE(vc))
2535 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2537 if (vc->vc_need_wrap)
2541 if (c == 8) { /* backspace */
2543 start = (ushort *)vc->vc_pos;
2550 start = (ushort *)vc->vc_pos;
2552 if (c == 10 || c == 13)
2555 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2556 notify_write(vc, c);
2558 if (myx == vc->vc_cols - 1) {
2559 vc->vc_need_wrap = 1;
2566 if (CON_IS_VISIBLE(vc))
2567 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2569 if (vc->vc_x == vc->vc_cols) {
2571 vc->vc_need_wrap = 1;
2578 spin_unlock(&printing_lock);
2581 static struct tty_driver *vt_console_device(struct console *c, int *index)
2583 *index = c->index ? c->index-1 : fg_console;
2584 return console_driver;
2587 static struct console vt_console_driver = {
2589 .write = vt_console_print,
2590 .device = vt_console_device,
2591 .unblank = unblank_screen,
2592 .flags = CON_PRINTBUFFER,
2598 * Handling of Linux-specific VC ioctls
2602 * Generally a bit racy with respect to console_sem().
2604 * There are some functions which don't need it.
2606 * There are some functions which can sleep for arbitrary periods
2607 * (paste_selection) but we don't need the lock there anyway.
2609 * set_selection has locking, and definitely needs it
2612 int tioclinux(struct tty_struct *tty, unsigned long arg)
2615 char __user *p = (char __user *)arg;
2619 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2621 if (get_user(type, p))
2628 acquire_console_sem();
2629 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2630 release_console_sem();
2632 case TIOCL_PASTESEL:
2633 ret = paste_selection(tty);
2635 case TIOCL_UNBLANKSCREEN:
2636 acquire_console_sem();
2638 release_console_sem();
2640 case TIOCL_SELLOADLUT:
2641 ret = sel_loadlut(p);
2643 case TIOCL_GETSHIFTSTATE:
2646 * Make it possible to react to Shift+Mousebutton.
2647 * Note that 'shift_state' is an undocumented
2648 * kernel-internal variable; programs not closely
2649 * related to the kernel should not use this.
2652 ret = __put_user(data, p);
2654 case TIOCL_GETMOUSEREPORTING:
2655 data = mouse_reporting();
2656 ret = __put_user(data, p);
2658 case TIOCL_SETVESABLANK:
2659 ret = set_vesa_blanking(p);
2661 case TIOCL_GETKMSGREDIRECT:
2662 data = vt_get_kmsg_redirect();
2663 ret = __put_user(data, p);
2665 case TIOCL_SETKMSGREDIRECT:
2666 if (!capable(CAP_SYS_ADMIN)) {
2669 if (get_user(data, p+1))
2672 vt_kmsg_redirect(data);
2675 case TIOCL_GETFGCONSOLE:
2678 case TIOCL_SCROLLCONSOLE:
2679 if (get_user(lines, (s32 __user *)(p+4))) {
2682 scrollfront(vc_cons[fg_console].d, lines);
2686 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2687 acquire_console_sem();
2690 release_console_sem();
2692 case TIOCL_BLANKEDSCREEN:
2693 ret = console_blanked;
2703 * /dev/ttyN handling
2706 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2710 retval = do_con_write(tty, buf, count);
2711 con_flush_chars(tty);
2716 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2719 return 0; /* n_r3964 calls put_char() from interrupt context */
2720 return do_con_write(tty, &ch, 1);
2723 static int con_write_room(struct tty_struct *tty)
2727 return 32768; /* No limit, really; we're not buffering */
2730 static int con_chars_in_buffer(struct tty_struct *tty)
2732 return 0; /* we're not buffering */
2736 * con_throttle and con_unthrottle are only used for
2737 * paste_selection(), which has to stuff in a large number of
2740 static void con_throttle(struct tty_struct *tty)
2744 static void con_unthrottle(struct tty_struct *tty)
2746 struct vc_data *vc = tty->driver_data;
2748 wake_up_interruptible(&vc->paste_wait);
2752 * Turn the Scroll-Lock LED on when the tty is stopped
2754 static void con_stop(struct tty_struct *tty)
2759 console_num = tty->index;
2760 if (!vc_cons_allocated(console_num))
2762 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2767 * Turn the Scroll-Lock LED off when the console is started
2769 static void con_start(struct tty_struct *tty)
2774 console_num = tty->index;
2775 if (!vc_cons_allocated(console_num))
2777 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2781 static void con_flush_chars(struct tty_struct *tty)
2785 if (in_interrupt()) /* from flush_to_ldisc */
2788 /* if we race with con_close(), vt may be null */
2789 acquire_console_sem();
2790 vc = tty->driver_data;
2793 release_console_sem();
2797 * Allocate the console screen memory.
2799 static int con_open(struct tty_struct *tty, struct file *filp)
2801 unsigned int currcons = tty->index;
2804 acquire_console_sem();
2805 if (tty->driver_data == NULL) {
2806 ret = vc_allocate(currcons);
2808 struct vc_data *vc = vc_cons[currcons].d;
2810 /* Still being freed */
2812 release_console_sem();
2813 return -ERESTARTSYS;
2815 tty->driver_data = vc;
2818 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2819 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2820 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2823 tty->termios->c_iflag |= IUTF8;
2825 tty->termios->c_iflag &= ~IUTF8;
2826 release_console_sem();
2830 release_console_sem();
2834 static void con_close(struct tty_struct *tty, struct file *filp)
2836 /* Nothing to do - we defer to shutdown */
2839 static void con_shutdown(struct tty_struct *tty)
2841 struct vc_data *vc = tty->driver_data;
2843 acquire_console_sem();
2844 vc->port.tty = NULL;
2845 release_console_sem();
2849 static int default_italic_color = 2; // green (ASCII)
2850 static int default_underline_color = 3; // cyan (ASCII)
2851 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2852 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2854 static void vc_init(struct vc_data *vc, unsigned int rows,
2855 unsigned int cols, int do_clear)
2861 vc->vc_size_row = cols << 1;
2862 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2865 vc->vc_pos = vc->vc_origin;
2867 for (j=k=0; j<16; j++) {
2868 vc->vc_palette[k++] = default_red[j] ;
2869 vc->vc_palette[k++] = default_grn[j] ;
2870 vc->vc_palette[k++] = default_blu[j] ;
2872 vc->vc_def_color = 0x07; /* white */
2873 vc->vc_ulcolor = default_underline_color;
2874 vc->vc_itcolor = default_italic_color;
2875 vc->vc_halfcolor = 0x08; /* grey */
2876 init_waitqueue_head(&vc->paste_wait);
2877 reset_terminal(vc, do_clear);
2881 * This routine initializes console interrupts, and does nothing
2882 * else. If you want the screen to clear, call tty_write with
2883 * the appropriate escape-sequence.
2886 static int __init con_init(void)
2888 const char *display_desc = NULL;
2890 unsigned int currcons = 0, i;
2892 acquire_console_sem();
2895 display_desc = conswitchp->con_startup();
2896 if (!display_desc) {
2898 release_console_sem();
2902 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2903 struct con_driver *con_driver = ®istered_con_driver[i];
2905 if (con_driver->con == NULL) {
2906 con_driver->con = conswitchp;
2907 con_driver->desc = display_desc;
2908 con_driver->flag = CON_DRIVER_FLAG_INIT;
2909 con_driver->first = 0;
2910 con_driver->last = MAX_NR_CONSOLES - 1;
2915 for (i = 0; i < MAX_NR_CONSOLES; i++)
2916 con_driver_map[i] = conswitchp;
2918 if (blankinterval) {
2919 blank_state = blank_normal_wait;
2920 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2923 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2924 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2925 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2926 tty_port_init(&vc->port);
2927 visual_init(vc, currcons, 1);
2928 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2929 vc_init(vc, vc->vc_rows, vc->vc_cols,
2930 currcons || !vc->vc_sw->con_save_screen);
2932 currcons = fg_console = 0;
2933 master_display_fg = vc = vc_cons[currcons].d;
2936 gotoxy(vc, vc->vc_x, vc->vc_y);
2939 printk("Console: %s %s %dx%d",
2940 vc->vc_can_do_color ? "colour" : "mono",
2941 display_desc, vc->vc_cols, vc->vc_rows);
2945 release_console_sem();
2947 #ifdef CONFIG_VT_CONSOLE
2948 register_console(&vt_console_driver);
2952 console_initcall(con_init);
2954 static const struct tty_operations con_ops = {
2958 .write_room = con_write_room,
2959 .put_char = con_put_char,
2960 .flush_chars = con_flush_chars,
2961 .chars_in_buffer = con_chars_in_buffer,
2963 #ifdef CONFIG_COMPAT
2964 .compat_ioctl = vt_compat_ioctl,
2968 .throttle = con_throttle,
2969 .unthrottle = con_unthrottle,
2970 .resize = vt_resize,
2971 .shutdown = con_shutdown
2974 static struct cdev vc0_cdev;
2976 int __init vty_init(const struct file_operations *console_fops)
2978 cdev_init(&vc0_cdev, console_fops);
2979 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2980 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2981 panic("Couldn't register /dev/tty0 driver\n");
2982 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2986 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2987 if (!console_driver)
2988 panic("Couldn't allocate console driver\n");
2989 console_driver->owner = THIS_MODULE;
2990 console_driver->name = "tty";
2991 console_driver->name_base = 1;
2992 console_driver->major = TTY_MAJOR;
2993 console_driver->minor_start = 1;
2994 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2995 console_driver->init_termios = tty_std_termios;
2997 console_driver->init_termios.c_iflag |= IUTF8;
2998 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2999 tty_set_operations(console_driver, &con_ops);
3000 if (tty_register_driver(console_driver))
3001 panic("Couldn't register console driver\n");
3004 #ifdef CONFIG_MDA_CONSOLE
3010 #ifndef VT_SINGLE_DRIVER
3012 static struct class *vtconsole_class;
3014 static int bind_con_driver(const struct consw *csw, int first, int last,
3017 struct module *owner = csw->owner;
3018 const char *desc = NULL;
3019 struct con_driver *con_driver;
3020 int i, j = -1, k = -1, retval = -ENODEV;
3022 if (!try_module_get(owner))
3025 acquire_console_sem();
3027 /* check if driver is registered */
3028 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3029 con_driver = ®istered_con_driver[i];
3031 if (con_driver->con == csw) {
3032 desc = con_driver->desc;
3041 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3043 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3048 module_put(conswitchp->owner);
3050 __module_get(owner);
3054 first = max(first, con_driver->first);
3055 last = min(last, con_driver->last);
3057 for (i = first; i <= last; i++) {
3059 struct vc_data *vc = vc_cons[i].d;
3061 if (con_driver_map[i])
3062 module_put(con_driver_map[i]->owner);
3063 __module_get(owner);
3064 con_driver_map[i] = csw;
3066 if (!vc || !vc->vc_sw)
3071 if (CON_IS_VISIBLE(vc)) {
3076 old_was_color = vc->vc_can_do_color;
3077 vc->vc_sw->con_deinit(vc);
3079 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3080 visual_init(vc, i, 0);
3084 /* If the console changed between mono <-> color, then
3085 * the attributes in the screenbuf will be wrong. The
3086 * following resets all attributes to something sane.
3088 if (old_was_color != vc->vc_can_do_color)
3089 clear_buffer_attributes(vc);
3092 printk("Console: switching ");
3094 printk("consoles %d-%d ", first+1, last+1);
3096 struct vc_data *vc = vc_cons[j].d;
3098 printk("to %s %s %dx%d\n",
3099 vc->vc_can_do_color ? "colour" : "mono",
3100 desc, vc->vc_cols, vc->vc_rows);
3107 printk("to %s\n", desc);
3111 release_console_sem();
3116 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3117 static int con_is_graphics(const struct consw *csw, int first, int last)
3121 for (i = first; i <= last; i++) {
3122 struct vc_data *vc = vc_cons[i].d;
3124 if (vc && vc->vc_mode == KD_GRAPHICS) {
3134 * unbind_con_driver - unbind a console driver
3135 * @csw: pointer to console driver to unregister
3136 * @first: first in range of consoles that @csw should be unbound from
3137 * @last: last in range of consoles that @csw should be unbound from
3138 * @deflt: should next bound console driver be default after @csw is unbound?
3140 * To unbind a driver from all possible consoles, pass 0 as @first and
3141 * %MAX_NR_CONSOLES as @last.
3143 * @deflt controls whether the console that ends up replacing @csw should be
3144 * the default console.
3147 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3150 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3152 struct module *owner = csw->owner;
3153 const struct consw *defcsw = NULL;
3154 struct con_driver *con_driver = NULL, *con_back = NULL;
3155 int i, retval = -ENODEV;
3157 if (!try_module_get(owner))
3160 acquire_console_sem();
3162 /* check if driver is registered and if it is unbindable */
3163 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3164 con_driver = ®istered_con_driver[i];
3166 if (con_driver->con == csw &&
3167 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3174 release_console_sem();
3180 /* check if backup driver exists */
3181 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3182 con_back = ®istered_con_driver[i];
3184 if (con_back->con &&
3185 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3186 defcsw = con_back->con;
3193 release_console_sem();
3197 if (!con_is_bound(csw)) {
3198 release_console_sem();
3202 first = max(first, con_driver->first);
3203 last = min(last, con_driver->last);
3205 for (i = first; i <= last; i++) {
3206 if (con_driver_map[i] == csw) {
3207 module_put(csw->owner);
3208 con_driver_map[i] = NULL;
3212 if (!con_is_bound(defcsw)) {
3213 const struct consw *defconsw = conswitchp;
3215 defcsw->con_startup();
3216 con_back->flag |= CON_DRIVER_FLAG_INIT;
3218 * vgacon may change the default driver to point
3219 * to dummycon, we restore it here...
3221 conswitchp = defconsw;
3224 if (!con_is_bound(csw))
3225 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3227 release_console_sem();
3228 /* ignore return value, binding should not fail */
3229 bind_con_driver(defcsw, first, last, deflt);
3235 EXPORT_SYMBOL(unbind_con_driver);
3237 static int vt_bind(struct con_driver *con)
3239 const struct consw *defcsw = NULL, *csw = NULL;
3240 int i, more = 1, first = -1, last = -1, deflt = 0;
3242 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3243 con_is_graphics(con->con, con->first, con->last))
3248 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3249 struct con_driver *con = ®istered_con_driver[i];
3251 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3263 for (i = con->first; i <= con->last; i++) {
3264 if (con_driver_map[i] == defcsw) {
3269 } else if (first != -1)
3273 if (first == 0 && last == MAX_NR_CONSOLES -1)
3277 bind_con_driver(csw, first, last, deflt);
3288 static int vt_unbind(struct con_driver *con)
3290 const struct consw *csw = NULL;
3291 int i, more = 1, first = -1, last = -1, deflt = 0;
3293 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3294 con_is_graphics(con->con, con->first, con->last))
3302 for (i = con->first; i <= con->last; i++) {
3303 if (con_driver_map[i] == csw) {
3308 } else if (first != -1)
3312 if (first == 0 && last == MAX_NR_CONSOLES -1)
3316 unbind_con_driver(csw, first, last, deflt);
3327 static inline int vt_bind(struct con_driver *con)
3331 static inline int vt_unbind(struct con_driver *con)
3335 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3337 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3338 const char *buf, size_t count)
3340 struct con_driver *con = dev_get_drvdata(dev);
3341 int bind = simple_strtoul(buf, NULL, 0);
3351 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3354 struct con_driver *con = dev_get_drvdata(dev);
3355 int bind = con_is_bound(con->con);
3357 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3360 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3363 struct con_driver *con = dev_get_drvdata(dev);
3365 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3366 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3371 static struct device_attribute device_attrs[] = {
3372 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3373 __ATTR(name, S_IRUGO, show_name, NULL),
3376 static int vtconsole_init_device(struct con_driver *con)
3381 con->flag |= CON_DRIVER_FLAG_ATTR;
3382 dev_set_drvdata(con->dev, con);
3383 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3384 error = device_create_file(con->dev, &device_attrs[i]);
3391 device_remove_file(con->dev, &device_attrs[i]);
3392 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3398 static void vtconsole_deinit_device(struct con_driver *con)
3402 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3403 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3404 device_remove_file(con->dev, &device_attrs[i]);
3405 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3410 * con_is_bound - checks if driver is bound to the console
3411 * @csw: console driver
3413 * RETURNS: zero if unbound, nonzero if bound
3415 * Drivers can call this and if zero, they should release
3416 * all resources allocated on con_startup()
3418 int con_is_bound(const struct consw *csw)
3422 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3423 if (con_driver_map[i] == csw) {
3431 EXPORT_SYMBOL(con_is_bound);
3434 * con_debug_enter - prepare the console for the kernel debugger
3435 * @sw: console driver
3437 * Called when the console is taken over by the kernel debugger, this
3438 * function needs to save the current console state, then put the console
3439 * into a state suitable for the kernel debugger.
3442 * Zero on success, nonzero if a failure occurred when trying to prepare
3443 * the console for the debugger.
3445 int con_debug_enter(struct vc_data *vc)
3449 saved_fg_console = fg_console;
3450 saved_last_console = last_console;
3451 saved_want_console = want_console;
3452 saved_vc_mode = vc->vc_mode;
3453 saved_console_blanked = console_blanked;
3454 vc->vc_mode = KD_TEXT;
3455 console_blanked = 0;
3456 if (vc->vc_sw->con_debug_enter)
3457 ret = vc->vc_sw->con_debug_enter(vc);
3458 #ifdef CONFIG_KGDB_KDB
3459 /* Set the initial LINES variable if it is not already set */
3460 if (vc->vc_rows < 999) {
3463 const char *setargs[3] = {
3468 if (kdbgetintenv(setargs[0], &linecount)) {
3469 snprintf(lns, 4, "%i", vc->vc_rows);
3470 kdb_set(2, setargs);
3473 #endif /* CONFIG_KGDB_KDB */
3476 EXPORT_SYMBOL_GPL(con_debug_enter);
3479 * con_debug_leave - restore console state
3480 * @sw: console driver
3482 * Restore the console state to what it was before the kernel debugger
3486 * Zero on success, nonzero if a failure occurred when trying to restore
3489 int con_debug_leave(void)
3494 fg_console = saved_fg_console;
3495 last_console = saved_last_console;
3496 want_console = saved_want_console;
3497 console_blanked = saved_console_blanked;
3498 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3500 vc = vc_cons[fg_console].d;
3501 if (vc->vc_sw->con_debug_leave)
3502 ret = vc->vc_sw->con_debug_leave(vc);
3505 EXPORT_SYMBOL_GPL(con_debug_leave);
3508 * register_con_driver - register console driver to console layer
3509 * @csw: console driver
3510 * @first: the first console to take over, minimum value is 0
3511 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3513 * DESCRIPTION: This function registers a console driver which can later
3514 * bind to a range of consoles specified by @first and @last. It will
3515 * also initialize the console driver by calling con_startup().
3517 int register_con_driver(const struct consw *csw, int first, int last)
3519 struct module *owner = csw->owner;
3520 struct con_driver *con_driver;
3524 if (!try_module_get(owner))
3527 acquire_console_sem();
3529 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3530 con_driver = ®istered_con_driver[i];
3532 /* already registered */
3533 if (con_driver->con == csw)
3540 desc = csw->con_startup();
3547 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3548 con_driver = ®istered_con_driver[i];
3550 if (con_driver->con == NULL) {
3551 con_driver->con = csw;
3552 con_driver->desc = desc;
3553 con_driver->node = i;
3554 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3555 CON_DRIVER_FLAG_INIT;
3556 con_driver->first = first;
3557 con_driver->last = last;
3566 con_driver->dev = device_create(vtconsole_class, NULL,
3567 MKDEV(0, con_driver->node),
3571 if (IS_ERR(con_driver->dev)) {
3572 printk(KERN_WARNING "Unable to create device for %s; "
3573 "errno = %ld\n", con_driver->desc,
3574 PTR_ERR(con_driver->dev));
3575 con_driver->dev = NULL;
3577 vtconsole_init_device(con_driver);
3581 release_console_sem();
3585 EXPORT_SYMBOL(register_con_driver);
3588 * unregister_con_driver - unregister console driver from console layer
3589 * @csw: console driver
3591 * DESCRIPTION: All drivers that registers to the console layer must
3592 * call this function upon exit, or if the console driver is in a state
3593 * where it won't be able to handle console services, such as the
3594 * framebuffer console without loaded framebuffer drivers.
3596 * The driver must unbind first prior to unregistration.
3598 int unregister_con_driver(const struct consw *csw)
3600 int i, retval = -ENODEV;
3602 acquire_console_sem();
3604 /* cannot unregister a bound driver */
3605 if (con_is_bound(csw))
3608 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3609 struct con_driver *con_driver = ®istered_con_driver[i];
3611 if (con_driver->con == csw &&
3612 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3613 vtconsole_deinit_device(con_driver);
3614 device_destroy(vtconsole_class,
3615 MKDEV(0, con_driver->node));
3616 con_driver->con = NULL;
3617 con_driver->desc = NULL;
3618 con_driver->dev = NULL;
3619 con_driver->node = 0;
3620 con_driver->flag = 0;
3621 con_driver->first = 0;
3622 con_driver->last = 0;
3628 release_console_sem();
3631 EXPORT_SYMBOL(unregister_con_driver);
3634 * If we support more console drivers, this function is used
3635 * when a driver wants to take over some existing consoles
3636 * and become default driver for newly opened ones.
3638 * take_over_console is basically a register followed by unbind
3640 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3644 err = register_con_driver(csw, first, last);
3647 bind_con_driver(csw, first, last, deflt);
3653 * give_up_console is a wrapper to unregister_con_driver. It will only
3654 * work if driver is fully unbound.
3656 void give_up_console(const struct consw *csw)
3658 unregister_con_driver(csw);
3661 static int __init vtconsole_class_init(void)
3665 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3666 if (IS_ERR(vtconsole_class)) {
3667 printk(KERN_WARNING "Unable to create vt console class; "
3668 "errno = %ld\n", PTR_ERR(vtconsole_class));
3669 vtconsole_class = NULL;
3672 /* Add system drivers to sysfs */
3673 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3674 struct con_driver *con = ®istered_con_driver[i];
3676 if (con->con && !con->dev) {
3677 con->dev = device_create(vtconsole_class, NULL,
3678 MKDEV(0, con->node),
3682 if (IS_ERR(con->dev)) {
3683 printk(KERN_WARNING "Unable to create "
3684 "device for %s; errno = %ld\n",
3685 con->desc, PTR_ERR(con->dev));
3688 vtconsole_init_device(con);
3695 postcore_initcall(vtconsole_class_init);
3703 static int set_vesa_blanking(char __user *p)
3707 if (get_user(mode, p + 1))
3710 vesa_blank_mode = (mode < 4) ? mode : 0;
3714 void do_blank_screen(int entering_gfx)
3716 struct vc_data *vc = vc_cons[fg_console].d;
3719 WARN_CONSOLE_UNLOCKED();
3721 if (console_blanked) {
3722 if (blank_state == blank_vesa_wait) {
3723 blank_state = blank_off;
3724 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3729 /* entering graphics mode? */
3733 vc->vc_sw->con_blank(vc, -1, 1);
3734 console_blanked = fg_console + 1;
3735 blank_state = blank_off;
3740 if (blank_state != blank_normal_wait)
3742 blank_state = blank_off;
3744 /* don't blank graphics */
3745 if (vc->vc_mode != KD_TEXT) {
3746 console_blanked = fg_console + 1;
3751 del_timer_sync(&console_timer);
3752 blank_timer_expired = 0;
3755 /* In case we need to reset origin, blanking hook returns 1 */
3756 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3757 console_blanked = fg_console + 1;
3761 if (console_blank_hook && console_blank_hook(1))
3764 if (vesa_off_interval && vesa_blank_mode) {
3765 blank_state = blank_vesa_wait;
3766 mod_timer(&console_timer, jiffies + vesa_off_interval);
3768 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3770 EXPORT_SYMBOL(do_blank_screen);
3773 * Called by timer as well as from vt_console_driver
3775 void do_unblank_screen(int leaving_gfx)
3779 /* This should now always be called from a "sane" (read: can schedule)
3780 * context for the sake of the low level drivers, except in the special
3781 * case of oops_in_progress
3783 if (!oops_in_progress)
3786 WARN_CONSOLE_UNLOCKED();
3789 if (!console_blanked)
3791 if (!vc_cons_allocated(fg_console)) {
3793 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3796 vc = vc_cons[fg_console].d;
3797 /* Try to unblank in oops case too */
3798 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3799 return; /* but leave console_blanked != 0 */
3801 if (blankinterval) {
3802 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3803 blank_state = blank_normal_wait;
3806 console_blanked = 0;
3807 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3808 /* Low-level driver cannot restore -> do it ourselves */
3810 if (console_blank_hook)
3811 console_blank_hook(0);
3814 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3816 EXPORT_SYMBOL(do_unblank_screen);
3819 * This is called by the outside world to cause a forced unblank, mostly for
3820 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3821 * call it with 1 as an argument and so force a mode restore... that may kill
3822 * X or at least garbage the screen but would also make the Oops visible...
3824 void unblank_screen(void)
3826 do_unblank_screen(0);
3830 * We defer the timer blanking to work queue so it can take the console mutex
3831 * (console operations can still happen at irq time, but only from printk which
3832 * has the console mutex. Not perfect yet, but better than no locking
3834 static void blank_screen_t(unsigned long dummy)
3836 if (unlikely(!keventd_up())) {
3837 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3840 blank_timer_expired = 1;
3841 schedule_work(&console_work);
3844 void poke_blanked_console(void)
3846 WARN_CONSOLE_UNLOCKED();
3848 /* Add this so we quickly catch whoever might call us in a non
3849 * safe context. Nowadays, unblank_screen() isn't to be called in
3850 * atomic contexts and is allowed to schedule (with the special case
3851 * of oops_in_progress, but that isn't of any concern for this
3856 /* This isn't perfectly race free, but a race here would be mostly harmless,
3857 * at worse, we'll do a spurrious blank and it's unlikely
3859 del_timer(&console_timer);
3860 blank_timer_expired = 0;
3862 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3864 if (console_blanked)
3866 else if (blankinterval) {
3867 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3868 blank_state = blank_normal_wait;
3876 static void set_palette(struct vc_data *vc)
3878 WARN_CONSOLE_UNLOCKED();
3880 if (vc->vc_mode != KD_GRAPHICS)
3881 vc->vc_sw->con_set_palette(vc, color_table);
3884 static int set_get_cmap(unsigned char __user *arg, int set)
3888 WARN_CONSOLE_UNLOCKED();
3890 for (i = 0; i < 16; i++)
3892 get_user(default_red[i], arg++);
3893 get_user(default_grn[i], arg++);
3894 get_user(default_blu[i], arg++);
3896 put_user(default_red[i], arg++);
3897 put_user(default_grn[i], arg++);
3898 put_user(default_blu[i], arg++);
3901 for (i = 0; i < MAX_NR_CONSOLES; i++)
3902 if (vc_cons_allocated(i)) {
3903 for (j = k = 0; j < 16; j++) {
3904 vc_cons[i].d->vc_palette[k++] = default_red[j];
3905 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3906 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3908 set_palette(vc_cons[i].d);
3915 * Load palette into the DAC registers. arg points to a colour
3916 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3919 int con_set_cmap(unsigned char __user *arg)
3923 acquire_console_sem();
3924 rc = set_get_cmap (arg,1);
3925 release_console_sem();
3930 int con_get_cmap(unsigned char __user *arg)
3934 acquire_console_sem();
3935 rc = set_get_cmap (arg,0);
3936 release_console_sem();
3941 void reset_palette(struct vc_data *vc)
3944 for (j=k=0; j<16; j++) {
3945 vc->vc_palette[k++] = default_red[j];
3946 vc->vc_palette[k++] = default_grn[j];
3947 vc->vc_palette[k++] = default_blu[j];
3955 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3956 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3957 * depending on width) reserved for each character which is kinda wasty, but
3958 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3959 * is upto the actual low-level console-driver convert data into its favorite
3960 * format (maybe we should add a `fontoffset' field to the `display'
3961 * structure so we won't have to convert the fontdata all the time.
3965 #define max_font_size 65536
3967 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3969 struct console_font font;
3973 if (vc->vc_mode != KD_TEXT)
3977 font.data = kmalloc(max_font_size, GFP_KERNEL);
3983 acquire_console_sem();
3984 if (vc->vc_sw->con_font_get)
3985 rc = vc->vc_sw->con_font_get(vc, &font);
3988 release_console_sem();
3993 c = (font.width+7)/8 * 32 * font.charcount;
3995 if (op->data && font.charcount > op->charcount)
3997 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3998 if (font.width > op->width || font.height > op->height)
4001 if (font.width != 8)
4003 else if ((op->height && font.height > op->height) ||
4010 op->height = font.height;
4011 op->width = font.width;
4012 op->charcount = font.charcount;
4014 if (op->data && copy_to_user(op->data, font.data, c))
4022 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4024 struct console_font font;
4028 if (vc->vc_mode != KD_TEXT)
4032 if (op->charcount > 512)
4034 if (!op->height) { /* Need to guess font height [compat] */
4036 u8 __user *charmap = op->data;
4039 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4040 so that we can get rid of this soon */
4041 if (!(op->flags & KD_FONT_FLAG_OLD))
4043 for (h = 32; h > 0; h--)
4044 for (i = 0; i < op->charcount; i++) {
4045 if (get_user(tmp, &charmap[32*i+h-1]))
4054 if (op->width <= 0 || op->width > 32 || op->height > 32)
4056 size = (op->width+7)/8 * 32 * op->charcount;
4057 if (size > max_font_size)
4059 font.charcount = op->charcount;
4060 font.height = op->height;
4061 font.width = op->width;
4062 font.data = memdup_user(op->data, size);
4063 if (IS_ERR(font.data))
4064 return PTR_ERR(font.data);
4065 acquire_console_sem();
4066 if (vc->vc_sw->con_font_set)
4067 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4070 release_console_sem();
4075 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4077 struct console_font font = {.width = op->width, .height = op->height};
4078 char name[MAX_FONT_NAME];
4082 if (vc->vc_mode != KD_TEXT)
4087 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4090 name[MAX_FONT_NAME - 1] = 0;
4092 acquire_console_sem();
4093 if (vc->vc_sw->con_font_default)
4094 rc = vc->vc_sw->con_font_default(vc, &font, s);
4097 release_console_sem();
4099 op->width = font.width;
4100 op->height = font.height;
4105 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4107 int con = op->height;
4110 if (vc->vc_mode != KD_TEXT)
4113 acquire_console_sem();
4114 if (!vc->vc_sw->con_font_copy)
4116 else if (con < 0 || !vc_cons_allocated(con))
4118 else if (con == vc->vc_num) /* nothing to do */
4121 rc = vc->vc_sw->con_font_copy(vc, con);
4122 release_console_sem();
4126 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4129 case KD_FONT_OP_SET:
4130 return con_font_set(vc, op);
4131 case KD_FONT_OP_GET:
4132 return con_font_get(vc, op);
4133 case KD_FONT_OP_SET_DEFAULT:
4134 return con_font_default(vc, op);
4135 case KD_FONT_OP_COPY:
4136 return con_font_copy(vc, op);
4142 * Interface exported to selection and vcs.
4145 /* used by selection */
4146 u16 screen_glyph(struct vc_data *vc, int offset)
4148 u16 w = scr_readw(screenpos(vc, offset, 1));
4151 if (w & vc->vc_hi_font_mask)
4155 EXPORT_SYMBOL_GPL(screen_glyph);
4157 /* used by vcs - note the word offset */
4158 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4160 return screenpos(vc, 2 * w_offset, viewed);
4163 void getconsxy(struct vc_data *vc, unsigned char *p)
4169 void putconsxy(struct vc_data *vc, unsigned char *p)
4172 gotoxy(vc, p[0], p[1]);
4176 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4178 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4179 return softcursor_original;
4180 return scr_readw(org);
4183 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4185 scr_writew(val, org);
4186 if ((unsigned long)org == vc->vc_pos) {
4187 softcursor_original = -1;
4193 * Visible symbols for modules
4196 EXPORT_SYMBOL(color_table);
4197 EXPORT_SYMBOL(default_red);
4198 EXPORT_SYMBOL(default_grn);
4199 EXPORT_SYMBOL(default_blu);
4200 EXPORT_SYMBOL(update_region);
4201 EXPORT_SYMBOL(redraw_screen);
4202 EXPORT_SYMBOL(vc_resize);
4203 EXPORT_SYMBOL(fg_console);
4204 EXPORT_SYMBOL(console_blank_hook);
4205 EXPORT_SYMBOL(console_blanked);
4206 EXPORT_SYMBOL(vc_cons);
4207 EXPORT_SYMBOL(global_cursor_default);
4208 #ifndef VT_SINGLE_DRIVER
4209 EXPORT_SYMBOL(take_over_console);
4210 EXPORT_SYMBOL(give_up_console);