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>
108 #define MAX_NR_CON_DRIVER 16
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
115 const struct consw *con;
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
141 struct vc vc_cons [MAX_NR_CONSOLES];
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
161 static int printable; /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
166 * ignore_poke: don't unblank the screen when things are typed. This is
167 * mainly for the privacy of braille terminal users.
169 static int ignore_poke;
171 int do_poke_blanked_console;
174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
175 static int vesa_off_interval;
176 static int blankinterval = 10*60;
177 core_param(consoleblank, blankinterval, int, 0444);
179 static DECLARE_WORK(console_work, console_callback);
182 * fg_console is the current virtual console,
183 * last_console is the last used one,
184 * want_console is the console we want to switch to,
185 * kmsg_redirect is the console for kernel messages,
189 int want_console = -1;
193 * For each existing display, we have a pointer to console currently visible
194 * on that display, allowing consoles other than fg_console to be refreshed
195 * appropriately. Unless the low-level driver supplies its own display_fg
196 * variable, we use this one for the "master display".
198 static struct vc_data *master_display_fg;
201 * Unfortunately, we need to delay tty echo when we're currently writing to the
202 * console since the code is (and always was) not re-entrant, so we schedule
203 * all flip requests to process context with schedule-task() and run it from
204 * console_callback().
208 * For the same reason, we defer scrollback to the console callback.
210 static int scrollback_delta;
213 * Hook so that the power management routines can (un)blank
214 * the console on our behalf.
216 int (*console_blank_hook)(int);
218 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
219 static int blank_state;
220 static int blank_timer_expired;
228 * Notifier list for console events.
230 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
232 int register_vt_notifier(struct notifier_block *nb)
234 return atomic_notifier_chain_register(&vt_notifier_list, nb);
236 EXPORT_SYMBOL_GPL(register_vt_notifier);
238 int unregister_vt_notifier(struct notifier_block *nb)
240 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
242 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
244 static void notify_write(struct vc_data *vc, unsigned int unicode)
246 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
247 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
250 static void notify_update(struct vc_data *vc)
252 struct vt_notifier_param param = { .vc = vc };
253 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
257 * Low-Level Functions
260 #define IS_FG(vc) ((vc)->vc_num == fg_console)
262 #ifdef VT_BUF_VRAM_ONLY
263 #define DO_UPDATE(vc) 0
265 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
268 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
273 p = (unsigned short *)(vc->vc_origin + offset);
274 else if (!vc->vc_sw->con_screen_pos)
275 p = (unsigned short *)(vc->vc_visible_origin + offset);
277 p = vc->vc_sw->con_screen_pos(vc, offset);
281 static inline void scrolldelta(int lines)
283 scrollback_delta += lines;
284 schedule_console_callback();
287 void schedule_console_callback(void)
289 schedule_work(&console_work);
292 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
294 unsigned short *d, *s;
298 if (b > vc->vc_rows || t >= b || nr < 1)
300 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
302 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
303 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
304 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
305 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
306 vc->vc_size_row * nr);
309 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
316 if (b > vc->vc_rows || t >= b || nr < 1)
318 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
320 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
321 step = vc->vc_cols * nr;
322 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
323 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
326 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
328 #ifndef VT_BUF_VRAM_ONLY
329 unsigned int xx, yy, offset;
333 if (!vc->vc_sw->con_getxy) {
334 offset = (start - vc->vc_origin) / 2;
335 xx = offset % vc->vc_cols;
336 yy = offset / vc->vc_cols;
339 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
343 u16 attrib = scr_readw(p) & 0xff00;
346 while (xx < vc->vc_cols && count) {
347 if (attrib != (scr_readw(p) & 0xff00)) {
349 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
352 attrib = scr_readw(p) & 0xff00;
359 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
364 if (vc->vc_sw->con_getxy) {
366 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
372 void update_region(struct vc_data *vc, unsigned long start, int count)
374 WARN_CONSOLE_UNLOCKED();
378 do_update_region(vc, start, count);
383 /* Structure of attributes is hardware-dependent */
385 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
386 u8 _underline, u8 _reverse, u8 _italic)
388 if (vc->vc_sw->con_build_attr)
389 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
390 _blink, _underline, _reverse, _italic);
392 #ifndef VT_BUF_VRAM_ONLY
394 * ++roman: I completely changed the attribute format for monochrome
395 * mode (!can_do_color). The formerly used MDA (monochrome display
396 * adapter) format didn't allow the combination of certain effects.
397 * Now the attribute is just a bit vector:
398 * Bit 0..1: intensity (0..2)
405 if (!vc->vc_can_do_color)
408 (_underline ? 4 : 0) |
412 a = (a & 0xF0) | vc->vc_itcolor;
414 a = (a & 0xf0) | vc->vc_ulcolor;
415 else if (_intensity == 0)
416 a = (a & 0xf0) | vc->vc_ulcolor;
418 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
423 if (vc->vc_hi_font_mask == 0x100)
432 static void update_attr(struct vc_data *vc)
434 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
435 vc->vc_blink, vc->vc_underline,
436 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
437 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
440 /* Note: inverting the screen twice should revert to the original state */
441 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
445 WARN_CONSOLE_UNLOCKED();
448 p = screenpos(vc, offset, viewed);
449 if (vc->vc_sw->con_invert_region)
450 vc->vc_sw->con_invert_region(vc, p, count);
451 #ifndef VT_BUF_VRAM_ONLY
457 if (!vc->vc_can_do_color) {
464 } else if (vc->vc_hi_font_mask == 0x100) {
467 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
474 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
482 do_update_region(vc, (unsigned long) p, count);
485 /* used by selection: complement pointer position */
486 void complement_pos(struct vc_data *vc, int offset)
488 static int old_offset = -1;
489 static unsigned short old;
490 static unsigned short oldx, oldy;
492 WARN_CONSOLE_UNLOCKED();
494 if (old_offset != -1 && old_offset >= 0 &&
495 old_offset < vc->vc_screenbuf_size) {
496 scr_writew(old, screenpos(vc, old_offset, 1));
498 vc->vc_sw->con_putc(vc, old, oldy, oldx);
503 if (offset != -1 && offset >= 0 &&
504 offset < vc->vc_screenbuf_size) {
507 p = screenpos(vc, offset, 1);
509 new = old ^ vc->vc_complement_mask;
512 oldx = (offset >> 1) % vc->vc_cols;
513 oldy = (offset >> 1) / vc->vc_cols;
514 vc->vc_sw->con_putc(vc, new, oldy, oldx);
520 static void insert_char(struct vc_data *vc, unsigned int nr)
522 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
524 p = q + vc->vc_cols - nr - vc->vc_x;
526 scr_writew(scr_readw(p), p + nr);
527 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
528 vc->vc_need_wrap = 0;
530 unsigned short oldattr = vc->vc_attr;
531 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
532 vc->vc_cols - vc->vc_x - nr);
533 vc->vc_attr = vc->vc_video_erase_char >> 8;
535 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
536 vc->vc_attr = oldattr;
540 static void delete_char(struct vc_data *vc, unsigned int nr)
542 unsigned int i = vc->vc_x;
543 unsigned short *p = (unsigned short *)vc->vc_pos;
545 while (++i <= vc->vc_cols - nr) {
546 scr_writew(scr_readw(p+nr), p);
549 scr_memsetw(p, 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 + nr, vc->vc_y, vc->vc_x, 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,
558 vc->vc_cols - 1 - nr);
559 vc->vc_attr = oldattr;
563 static int softcursor_original;
565 static void add_softcursor(struct vc_data *vc)
567 int i = scr_readw((u16 *) vc->vc_pos);
568 u32 type = vc->vc_cursor_type;
570 if (! (type & 0x10)) return;
571 if (softcursor_original != -1) return;
572 softcursor_original = i;
573 i |= ((type >> 8) & 0xff00 );
574 i ^= ((type) & 0xff00 );
575 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
576 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
577 scr_writew(i, (u16 *) vc->vc_pos);
579 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
582 static void hide_softcursor(struct vc_data *vc)
584 if (softcursor_original != -1) {
585 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
587 vc->vc_sw->con_putc(vc, softcursor_original,
589 softcursor_original = -1;
593 static void hide_cursor(struct vc_data *vc)
597 vc->vc_sw->con_cursor(vc, CM_ERASE);
601 static void set_cursor(struct vc_data *vc)
603 if (!IS_FG(vc) || console_blanked ||
604 vc->vc_mode == KD_GRAPHICS)
610 if ((vc->vc_cursor_type & 0x0f) != 1)
611 vc->vc_sw->con_cursor(vc, CM_DRAW);
616 static void set_origin(struct vc_data *vc)
618 WARN_CONSOLE_UNLOCKED();
620 if (!CON_IS_VISIBLE(vc) ||
621 !vc->vc_sw->con_set_origin ||
622 !vc->vc_sw->con_set_origin(vc))
623 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
624 vc->vc_visible_origin = vc->vc_origin;
625 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
626 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
629 static inline void save_screen(struct vc_data *vc)
631 WARN_CONSOLE_UNLOCKED();
633 if (vc->vc_sw->con_save_screen)
634 vc->vc_sw->con_save_screen(vc);
638 * Redrawing of screen
641 static void clear_buffer_attributes(struct vc_data *vc)
643 unsigned short *p = (unsigned short *)vc->vc_origin;
644 int count = vc->vc_screenbuf_size / 2;
645 int mask = vc->vc_hi_font_mask | 0xff;
647 for (; count > 0; count--, p++) {
648 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
652 void redraw_screen(struct vc_data *vc, int is_switch)
656 WARN_CONSOLE_UNLOCKED();
660 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
665 struct vc_data *old_vc = vc_cons[fg_console].d;
668 if (!CON_IS_VISIBLE(vc))
670 *vc->vc_display_fg = vc;
671 fg_console = vc->vc_num;
673 if (!CON_IS_VISIBLE(old_vc)) {
684 int old_was_color = vc->vc_can_do_color;
687 update = vc->vc_sw->con_switch(vc);
690 * If console changed from mono<->color, the best we can do
691 * is to clear the buffer attributes. As it currently stands,
692 * rebuilding new attributes from the old buffer is not doable
693 * without overly complex code.
695 if (old_was_color != vc->vc_can_do_color) {
697 clear_buffer_attributes(vc);
699 if (update && vc->vc_mode != KD_GRAPHICS)
700 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
705 compute_shiftstate();
711 * Allocation, freeing and resizing of VTs.
714 int vc_cons_allocated(unsigned int i)
716 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
719 static void visual_init(struct vc_data *vc, int num, int init)
721 /* ++Geert: vc->vc_sw->con_init determines console size */
723 module_put(vc->vc_sw->owner);
724 vc->vc_sw = conswitchp;
725 #ifndef VT_SINGLE_DRIVER
726 if (con_driver_map[num])
727 vc->vc_sw = con_driver_map[num];
729 __module_get(vc->vc_sw->owner);
731 vc->vc_display_fg = &master_display_fg;
732 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
733 vc->vc_uni_pagedir = 0;
734 vc->vc_hi_font_mask = 0;
735 vc->vc_complement_mask = 0;
736 vc->vc_can_do_color = 0;
737 vc->vc_sw->con_init(vc, init);
738 if (!vc->vc_complement_mask)
739 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
740 vc->vc_s_complement_mask = vc->vc_complement_mask;
741 vc->vc_size_row = vc->vc_cols << 1;
742 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
745 int vc_allocate(unsigned int currcons) /* return 0 on success */
747 WARN_CONSOLE_UNLOCKED();
749 if (currcons >= MAX_NR_CONSOLES)
751 if (!vc_cons[currcons].d) {
753 struct vt_notifier_param param;
755 /* prevent users from taking too much memory */
756 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
759 /* due to the granularity of kmalloc, we waste some memory here */
760 /* the alloc is done in two steps, to optimize the common situation
761 of a 25x80 console (structsize=216, screenbuf_size=4000) */
762 /* although the numbers above are not valid since long ago, the
763 point is still up-to-date and the comment still has its value
764 even if only as a historical artifact. --mj, July 1998 */
765 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
768 vc_cons[currcons].d = vc;
769 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
770 visual_init(vc, currcons, 1);
771 if (!*vc->vc_uni_pagedir_loc)
772 con_set_default_unimap(vc);
773 if (!vc->vc_kmalloced)
774 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
775 if (!vc->vc_screenbuf) {
777 vc_cons[currcons].d = NULL;
780 vc->vc_kmalloced = 1;
781 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
782 vcs_make_sysfs(currcons);
783 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
788 static inline int resize_screen(struct vc_data *vc, int width, int height,
791 /* Resizes the resolution of the display adapater */
794 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
795 err = vc->vc_sw->con_resize(vc, width, height, user);
801 * Change # of rows and columns (0 means unchanged/the size of fg_console)
802 * [this is to be used together with some user program
803 * like resize that changes the hardware videomode]
805 #define VC_RESIZE_MAXCOL (32767)
806 #define VC_RESIZE_MAXROW (32767)
809 * vc_do_resize - resizing method for the tty
810 * @tty: tty being resized
811 * @real_tty: real tty (different to tty if a pty/tty pair)
812 * @vc: virtual console private data
816 * Resize a virtual console, clipping according to the actual constraints.
817 * If the caller passes a tty structure then update the termios winsize
818 * information and perform any neccessary signal handling.
820 * Caller must hold the console semaphore. Takes the termios mutex and
821 * ctrl_lock of the tty IFF a tty is passed.
824 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
825 unsigned int cols, unsigned int lines)
827 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
828 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
829 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
830 unsigned int end, user;
831 unsigned short *newscreen;
833 WARN_CONSOLE_UNLOCKED();
838 user = vc->vc_resize_user;
839 vc->vc_resize_user = 0;
841 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
844 new_cols = (cols ? cols : vc->vc_cols);
845 new_rows = (lines ? lines : vc->vc_rows);
846 new_row_size = new_cols << 1;
847 new_screen_size = new_row_size * new_rows;
849 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
852 newscreen = kmalloc(new_screen_size, GFP_USER);
856 old_rows = vc->vc_rows;
857 old_cols = vc->vc_cols;
858 old_row_size = vc->vc_size_row;
859 old_screen_size = vc->vc_screenbuf_size;
861 err = resize_screen(vc, new_cols, new_rows, user);
867 vc->vc_rows = new_rows;
868 vc->vc_cols = new_cols;
869 vc->vc_size_row = new_row_size;
870 vc->vc_screenbuf_size = new_screen_size;
872 rlth = min(old_row_size, new_row_size);
873 rrem = new_row_size - rlth;
874 old_origin = vc->vc_origin;
875 new_origin = (long) newscreen;
876 new_scr_end = new_origin + new_screen_size;
878 if (vc->vc_y > new_rows) {
879 if (old_rows - vc->vc_y < new_rows) {
881 * Cursor near the bottom, copy contents from the
884 old_origin += (old_rows - new_rows) * old_row_size;
885 end = vc->vc_scr_end;
888 * Cursor is in no man's land, copy 1/2 screenful
889 * from the top and bottom of cursor position
891 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
892 end = old_origin + (old_row_size * new_rows);
896 * Cursor near the top, copy contents from the top of buffer
898 end = (old_rows > new_rows) ? old_origin +
899 (old_row_size * new_rows) :
904 while (old_origin < end) {
905 scr_memcpyw((unsigned short *) new_origin,
906 (unsigned short *) old_origin, rlth);
908 scr_memsetw((void *)(new_origin + rlth),
909 vc->vc_video_erase_char, rrem);
910 old_origin += old_row_size;
911 new_origin += new_row_size;
913 if (new_scr_end > new_origin)
914 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
915 new_scr_end - new_origin);
916 if (vc->vc_kmalloced)
917 kfree(vc->vc_screenbuf);
918 vc->vc_screenbuf = newscreen;
919 vc->vc_kmalloced = 1;
920 vc->vc_screenbuf_size = new_screen_size;
923 /* do part of a reset_terminal() */
925 vc->vc_bottom = vc->vc_rows;
926 gotoxy(vc, vc->vc_x, vc->vc_y);
930 /* Rewrite the requested winsize data with the actual
933 memset(&ws, 0, sizeof(ws));
934 ws.ws_row = vc->vc_rows;
935 ws.ws_col = vc->vc_cols;
936 ws.ws_ypixel = vc->vc_scan_lines;
937 tty_do_resize(tty, &ws);
940 if (CON_IS_VISIBLE(vc))
946 * vc_resize - resize a VT
947 * @vc: virtual console
951 * Resize a virtual console as seen from the console end of things. We
952 * use the common vc_do_resize methods to update the structures. The
953 * caller must hold the console sem to protect console internals and
957 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
959 return vc_do_resize(vc->vc_tty, vc, cols, rows);
963 * vt_resize - resize a VT
964 * @tty: tty to resize
965 * @ws: winsize attributes
967 * Resize a virtual terminal. This is called by the tty layer as we
968 * register our own handler for resizing. The mutual helper does all
971 * Takes the console sem and the called methods then take the tty
972 * termios_mutex and the tty ctrl_lock in that order.
974 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
976 struct vc_data *vc = tty->driver_data;
979 acquire_console_sem();
980 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
981 release_console_sem();
985 void vc_deallocate(unsigned int currcons)
987 WARN_CONSOLE_UNLOCKED();
989 if (vc_cons_allocated(currcons)) {
990 struct vc_data *vc = vc_cons[currcons].d;
991 struct vt_notifier_param param = { .vc = vc };
993 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
994 vcs_remove_sysfs(currcons);
995 vc->vc_sw->con_deinit(vc);
997 module_put(vc->vc_sw->owner);
998 if (vc->vc_kmalloced)
999 kfree(vc->vc_screenbuf);
1000 if (currcons >= MIN_NR_CONSOLES)
1002 vc_cons[currcons].d = NULL;
1010 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1011 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1012 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1014 #define decarm VC_REPEAT
1015 #define decckm VC_CKMODE
1016 #define kbdapplic VC_APPLIC
1020 * this is what the terminal answers to a ESC-Z or csi0c query.
1022 #define VT100ID "\033[?1;2c"
1023 #define VT102ID "\033[?6c"
1025 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1026 8,12,10,14, 9,13,11,15 };
1028 /* the default colour table, for VGA+ colour systems */
1029 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1030 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1031 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1032 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1033 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1034 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1036 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1037 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1038 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1041 * gotoxy() must verify all boundaries, because the arguments
1042 * might also be negative. If the given position is out of
1043 * bounds, the cursor is placed at the nearest margin.
1045 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1052 if (new_x >= vc->vc_cols)
1053 vc->vc_x = vc->vc_cols - 1;
1060 max_y = vc->vc_bottom;
1063 max_y = vc->vc_rows;
1067 else if (new_y >= max_y)
1068 vc->vc_y = max_y - 1;
1071 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1072 vc->vc_need_wrap = 0;
1075 /* for absolute user moves, when decom is set */
1076 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1078 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1081 void scrollback(struct vc_data *vc, int lines)
1084 lines = vc->vc_rows / 2;
1085 scrolldelta(-lines);
1088 void scrollfront(struct vc_data *vc, int lines)
1091 lines = vc->vc_rows / 2;
1095 static void lf(struct vc_data *vc)
1097 /* don't scroll if above bottom of scrolling region, or
1098 * if below scrolling region
1100 if (vc->vc_y + 1 == vc->vc_bottom)
1101 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1102 else if (vc->vc_y < vc->vc_rows - 1) {
1104 vc->vc_pos += vc->vc_size_row;
1106 vc->vc_need_wrap = 0;
1107 notify_write(vc, '\n');
1110 static void ri(struct vc_data *vc)
1112 /* don't scroll if below top of scrolling region, or
1113 * if above scrolling region
1115 if (vc->vc_y == vc->vc_top)
1116 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1117 else if (vc->vc_y > 0) {
1119 vc->vc_pos -= vc->vc_size_row;
1121 vc->vc_need_wrap = 0;
1124 static inline void cr(struct vc_data *vc)
1126 vc->vc_pos -= vc->vc_x << 1;
1127 vc->vc_need_wrap = vc->vc_x = 0;
1128 notify_write(vc, '\r');
1131 static inline void bs(struct vc_data *vc)
1136 vc->vc_need_wrap = 0;
1137 notify_write(vc, '\b');
1141 static inline void del(struct vc_data *vc)
1146 static void csi_J(struct vc_data *vc, int vpar)
1149 unsigned short * start;
1152 case 0: /* erase from cursor to end of display */
1153 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1154 start = (unsigned short *)vc->vc_pos;
1155 if (DO_UPDATE(vc)) {
1156 /* do in two stages */
1157 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1158 vc->vc_cols - vc->vc_x);
1159 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1160 vc->vc_rows - vc->vc_y - 1,
1164 case 1: /* erase from start to cursor */
1165 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1166 start = (unsigned short *)vc->vc_origin;
1167 if (DO_UPDATE(vc)) {
1168 /* do in two stages */
1169 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1171 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1175 case 2: /* erase whole display */
1176 count = vc->vc_cols * vc->vc_rows;
1177 start = (unsigned short *)vc->vc_origin;
1179 vc->vc_sw->con_clear(vc, 0, 0,
1186 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1187 vc->vc_need_wrap = 0;
1190 static void csi_K(struct vc_data *vc, int vpar)
1193 unsigned short * start;
1196 case 0: /* erase from cursor to end of line */
1197 count = vc->vc_cols - vc->vc_x;
1198 start = (unsigned short *)vc->vc_pos;
1200 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1201 vc->vc_cols - vc->vc_x);
1203 case 1: /* erase from start of line to cursor */
1204 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1205 count = vc->vc_x + 1;
1207 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1210 case 2: /* erase whole line */
1211 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1212 count = vc->vc_cols;
1214 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1220 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1221 vc->vc_need_wrap = 0;
1224 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1230 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1232 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1234 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1235 vc->vc_need_wrap = 0;
1238 static void default_attr(struct vc_data *vc)
1240 vc->vc_intensity = 1;
1242 vc->vc_underline = 0;
1245 vc->vc_color = vc->vc_def_color;
1248 /* console_sem is held */
1249 static void csi_m(struct vc_data *vc)
1253 for (i = 0; i <= vc->vc_npar; i++)
1254 switch (vc->vc_par[i]) {
1255 case 0: /* all attributes off */
1259 vc->vc_intensity = 2;
1262 vc->vc_intensity = 0;
1268 vc->vc_underline = 1;
1276 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1277 * Select primary font, don't display
1278 * control chars if defined, don't set
1281 vc->vc_translate = set_translate(vc->vc_charset == 0
1283 : vc->vc_G1_charset, vc);
1284 vc->vc_disp_ctrl = 0;
1285 vc->vc_toggle_meta = 0;
1287 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1288 * Select first alternate font, lets
1289 * chars < 32 be displayed as ROM chars.
1291 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1292 vc->vc_disp_ctrl = 1;
1293 vc->vc_toggle_meta = 0;
1295 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1296 * Select second alternate font, toggle
1297 * high bit before displaying as ROM char.
1299 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1300 vc->vc_disp_ctrl = 1;
1301 vc->vc_toggle_meta = 1;
1305 vc->vc_intensity = 1;
1311 vc->vc_underline = 0;
1319 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1320 * Enables underscore, white foreground
1321 * with white underscore (Linux - use
1322 * default foreground).
1324 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1325 vc->vc_underline = 1;
1327 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1328 * Disable underline option.
1329 * Reset colour to default? It did this
1332 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1333 vc->vc_underline = 0;
1336 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1339 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1340 vc->vc_color = color_table[vc->vc_par[i] - 30]
1341 | (vc->vc_color & 0xf0);
1342 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1343 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1344 | (vc->vc_color & 0x0f);
1350 static void respond_string(const char *p, struct tty_struct *tty)
1353 tty_insert_flip_char(tty, *p, 0);
1356 con_schedule_flip(tty);
1359 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1363 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1364 respond_string(buf, tty);
1367 static inline void status_report(struct tty_struct *tty)
1369 respond_string("\033[0n", tty); /* Terminal ok */
1372 static inline void respond_ID(struct tty_struct * tty)
1374 respond_string(VT102ID, tty);
1377 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1381 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1383 respond_string(buf, tty);
1386 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1387 int mouse_reporting(void)
1389 return vc_cons[fg_console].d->vc_report_mouse;
1392 /* console_sem is held */
1393 static void set_mode(struct vc_data *vc, int on_off)
1397 for (i = 0; i <= vc->vc_npar; i++)
1399 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1400 case 1: /* Cursor keys send ^[Ox/^[[x */
1402 set_kbd(vc, decckm);
1404 clr_kbd(vc, decckm);
1406 case 3: /* 80/132 mode switch unimplemented */
1407 vc->vc_deccolm = on_off;
1409 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1410 /* this alone does not suffice; some user mode
1411 utility has to change the hardware regs */
1414 case 5: /* Inverted screen on/off */
1415 if (vc->vc_decscnm != on_off) {
1416 vc->vc_decscnm = on_off;
1417 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1421 case 6: /* Origin relative/absolute */
1422 vc->vc_decom = on_off;
1425 case 7: /* Autowrap on/off */
1426 vc->vc_decawm = on_off;
1428 case 8: /* Autorepeat on/off */
1430 set_kbd(vc, decarm);
1432 clr_kbd(vc, decarm);
1435 vc->vc_report_mouse = on_off ? 1 : 0;
1437 case 25: /* Cursor on/off */
1438 vc->vc_deccm = on_off;
1441 vc->vc_report_mouse = on_off ? 2 : 0;
1445 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1446 case 3: /* Monitor (display ctrls) */
1447 vc->vc_disp_ctrl = on_off;
1449 case 4: /* Insert Mode on/off */
1450 vc->vc_decim = on_off;
1452 case 20: /* Lf, Enter == CrLf/Lf */
1462 /* console_sem is held */
1463 static void setterm_command(struct vc_data *vc)
1465 switch(vc->vc_par[0]) {
1466 case 1: /* set color for underline mode */
1467 if (vc->vc_can_do_color &&
1468 vc->vc_par[1] < 16) {
1469 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1470 if (vc->vc_underline)
1474 case 2: /* set color for half intensity mode */
1475 if (vc->vc_can_do_color &&
1476 vc->vc_par[1] < 16) {
1477 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1478 if (vc->vc_intensity == 0)
1482 case 8: /* store colors as defaults */
1483 vc->vc_def_color = vc->vc_attr;
1484 if (vc->vc_hi_font_mask == 0x100)
1485 vc->vc_def_color >>= 1;
1489 case 9: /* set blanking interval */
1490 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1491 poke_blanked_console();
1493 case 10: /* set bell frequency in Hz */
1494 if (vc->vc_npar >= 1)
1495 vc->vc_bell_pitch = vc->vc_par[1];
1497 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1499 case 11: /* set bell duration in msec */
1500 if (vc->vc_npar >= 1)
1501 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1502 vc->vc_par[1] * HZ / 1000 : 0;
1504 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1506 case 12: /* bring specified console to the front */
1507 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1508 set_console(vc->vc_par[1] - 1);
1510 case 13: /* unblank the screen */
1511 poke_blanked_console();
1513 case 14: /* set vesa powerdown interval */
1514 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1516 case 15: /* activate the previous console */
1517 set_console(last_console);
1522 /* console_sem is held */
1523 static void csi_at(struct vc_data *vc, unsigned int nr)
1525 if (nr > vc->vc_cols - vc->vc_x)
1526 nr = vc->vc_cols - vc->vc_x;
1529 insert_char(vc, nr);
1532 /* console_sem is held */
1533 static void csi_L(struct vc_data *vc, unsigned int nr)
1535 if (nr > vc->vc_rows - vc->vc_y)
1536 nr = vc->vc_rows - vc->vc_y;
1539 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1540 vc->vc_need_wrap = 0;
1543 /* console_sem is held */
1544 static void csi_P(struct vc_data *vc, unsigned int nr)
1546 if (nr > vc->vc_cols - vc->vc_x)
1547 nr = vc->vc_cols - vc->vc_x;
1550 delete_char(vc, nr);
1553 /* console_sem is held */
1554 static void csi_M(struct vc_data *vc, unsigned int nr)
1556 if (nr > vc->vc_rows - vc->vc_y)
1557 nr = vc->vc_rows - vc->vc_y;
1560 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1561 vc->vc_need_wrap = 0;
1564 /* console_sem is held (except via vc_init->reset_terminal */
1565 static void save_cur(struct vc_data *vc)
1567 vc->vc_saved_x = vc->vc_x;
1568 vc->vc_saved_y = vc->vc_y;
1569 vc->vc_s_intensity = vc->vc_intensity;
1570 vc->vc_s_italic = vc->vc_italic;
1571 vc->vc_s_underline = vc->vc_underline;
1572 vc->vc_s_blink = vc->vc_blink;
1573 vc->vc_s_reverse = vc->vc_reverse;
1574 vc->vc_s_charset = vc->vc_charset;
1575 vc->vc_s_color = vc->vc_color;
1576 vc->vc_saved_G0 = vc->vc_G0_charset;
1577 vc->vc_saved_G1 = vc->vc_G1_charset;
1580 /* console_sem is held */
1581 static void restore_cur(struct vc_data *vc)
1583 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1584 vc->vc_intensity = vc->vc_s_intensity;
1585 vc->vc_italic = vc->vc_s_italic;
1586 vc->vc_underline = vc->vc_s_underline;
1587 vc->vc_blink = vc->vc_s_blink;
1588 vc->vc_reverse = vc->vc_s_reverse;
1589 vc->vc_charset = vc->vc_s_charset;
1590 vc->vc_color = vc->vc_s_color;
1591 vc->vc_G0_charset = vc->vc_saved_G0;
1592 vc->vc_G1_charset = vc->vc_saved_G1;
1593 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1595 vc->vc_need_wrap = 0;
1598 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1599 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1602 /* console_sem is held (except via vc_init()) */
1603 static void reset_terminal(struct vc_data *vc, int do_clear)
1606 vc->vc_bottom = vc->vc_rows;
1607 vc->vc_state = ESnormal;
1609 vc->vc_translate = set_translate(LAT1_MAP, vc);
1610 vc->vc_G0_charset = LAT1_MAP;
1611 vc->vc_G1_charset = GRAF_MAP;
1613 vc->vc_need_wrap = 0;
1614 vc->vc_report_mouse = 0;
1615 vc->vc_utf = default_utf8;
1616 vc->vc_utf_count = 0;
1618 vc->vc_disp_ctrl = 0;
1619 vc->vc_toggle_meta = 0;
1627 set_kbd(vc, decarm);
1628 clr_kbd(vc, decckm);
1629 clr_kbd(vc, kbdapplic);
1631 kbd_table[vc->vc_num].lockstate = 0;
1632 kbd_table[vc->vc_num].slockstate = 0;
1633 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1634 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1635 /* do not do set_leds here because this causes an endless tasklet loop
1636 when the keyboard hasn't been initialized yet */
1638 vc->vc_cursor_type = CUR_DEFAULT;
1639 vc->vc_complement_mask = vc->vc_s_complement_mask;
1644 vc->vc_tab_stop[0] = 0x01010100;
1645 vc->vc_tab_stop[1] =
1646 vc->vc_tab_stop[2] =
1647 vc->vc_tab_stop[3] =
1648 vc->vc_tab_stop[4] =
1649 vc->vc_tab_stop[5] =
1650 vc->vc_tab_stop[6] =
1651 vc->vc_tab_stop[7] = 0x01010101;
1653 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1654 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1662 /* console_sem is held */
1663 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1666 * Control characters can be used in the _middle_
1667 * of an escape sequence.
1673 if (vc->vc_bell_duration)
1674 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1680 vc->vc_pos -= (vc->vc_x << 1);
1681 while (vc->vc_x < vc->vc_cols - 1) {
1683 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1686 vc->vc_pos += (vc->vc_x << 1);
1687 notify_write(vc, '\t');
1689 case 10: case 11: case 12:
1691 if (!is_kbd(vc, lnm))
1698 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1699 vc->vc_disp_ctrl = 1;
1703 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1704 vc->vc_disp_ctrl = 0;
1707 vc->vc_state = ESnormal;
1710 vc->vc_state = ESesc;
1716 vc->vc_state = ESsquare;
1719 switch(vc->vc_state) {
1721 vc->vc_state = ESnormal;
1724 vc->vc_state = ESsquare;
1727 vc->vc_state = ESnonstd;
1730 vc->vc_state = ESpercent;
1743 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1755 vc->vc_state = ESsetG0;
1758 vc->vc_state = ESsetG1;
1761 vc->vc_state = EShash;
1764 reset_terminal(vc, 1);
1766 case '>': /* Numeric keypad */
1767 clr_kbd(vc, kbdapplic);
1769 case '=': /* Appl. keypad */
1770 set_kbd(vc, kbdapplic);
1775 if (c=='P') { /* palette escape sequence */
1776 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1777 vc->vc_par[vc->vc_npar] = 0;
1779 vc->vc_state = ESpalette;
1781 } else if (c=='R') { /* reset palette */
1783 vc->vc_state = ESnormal;
1785 vc->vc_state = ESnormal;
1788 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1789 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1790 if (vc->vc_npar == 7) {
1791 int i = vc->vc_par[0] * 3, j = 1;
1792 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1793 vc->vc_palette[i++] += vc->vc_par[j++];
1794 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1795 vc->vc_palette[i++] += vc->vc_par[j++];
1796 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1797 vc->vc_palette[i] += vc->vc_par[j];
1799 vc->vc_state = ESnormal;
1802 vc->vc_state = ESnormal;
1805 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1806 vc->vc_par[vc->vc_npar] = 0;
1808 vc->vc_state = ESgetpars;
1809 if (c == '[') { /* Function key */
1810 vc->vc_state=ESfunckey;
1813 vc->vc_ques = (c == '?');
1817 if (c == ';' && vc->vc_npar < NPAR - 1) {
1820 } else if (c>='0' && c<='9') {
1821 vc->vc_par[vc->vc_npar] *= 10;
1822 vc->vc_par[vc->vc_npar] += c - '0';
1825 vc->vc_state = ESgotpars;
1827 vc->vc_state = ESnormal;
1838 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1840 vc->vc_cursor_type = CUR_DEFAULT;
1848 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1850 vc->vc_complement_mask = vc->vc_s_complement_mask;
1856 if (vc->vc_par[0] == 5)
1858 else if (vc->vc_par[0] == 6)
1859 cursor_report(vc, tty);
1871 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1876 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1881 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1886 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1891 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1896 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1901 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1906 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1913 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1916 csi_J(vc, vc->vc_par[0]);
1919 csi_K(vc, vc->vc_par[0]);
1922 csi_L(vc, vc->vc_par[0]);
1925 csi_M(vc, vc->vc_par[0]);
1928 csi_P(vc, vc->vc_par[0]);
1936 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1937 else if (vc->vc_par[0] == 3) {
1938 vc->vc_tab_stop[0] =
1939 vc->vc_tab_stop[1] =
1940 vc->vc_tab_stop[2] =
1941 vc->vc_tab_stop[3] =
1942 vc->vc_tab_stop[4] =
1943 vc->vc_tab_stop[5] =
1944 vc->vc_tab_stop[6] =
1945 vc->vc_tab_stop[7] = 0;
1951 case 'q': /* DECLL - but only 3 leds */
1952 /* map 0,1,2,3 to 0,1,2,4 */
1953 if (vc->vc_par[0] < 4)
1954 setledstate(kbd_table + vc->vc_num,
1955 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1961 vc->vc_par[1] = vc->vc_rows;
1962 /* Minimum allowed region is 2 lines */
1963 if (vc->vc_par[0] < vc->vc_par[1] &&
1964 vc->vc_par[1] <= vc->vc_rows) {
1965 vc->vc_top = vc->vc_par[0] - 1;
1966 vc->vc_bottom = vc->vc_par[1];
1977 csi_X(vc, vc->vc_par[0]);
1980 csi_at(vc, vc->vc_par[0]);
1982 case ']': /* setterm functions */
1983 setterm_command(vc);
1988 vc->vc_state = ESnormal;
1990 case '@': /* defined in ISO 2022 */
1993 case 'G': /* prelim official escape code */
1994 case '8': /* retained for compatibility */
2000 vc->vc_state = ESnormal;
2003 vc->vc_state = ESnormal;
2005 /* DEC screen alignment test. kludge :-) */
2006 vc->vc_video_erase_char =
2007 (vc->vc_video_erase_char & 0xff00) | 'E';
2009 vc->vc_video_erase_char =
2010 (vc->vc_video_erase_char & 0xff00) | ' ';
2011 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2016 vc->vc_G0_charset = GRAF_MAP;
2018 vc->vc_G0_charset = LAT1_MAP;
2020 vc->vc_G0_charset = IBMPC_MAP;
2022 vc->vc_G0_charset = USER_MAP;
2023 if (vc->vc_charset == 0)
2024 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2025 vc->vc_state = ESnormal;
2029 vc->vc_G1_charset = GRAF_MAP;
2031 vc->vc_G1_charset = LAT1_MAP;
2033 vc->vc_G1_charset = IBMPC_MAP;
2035 vc->vc_G1_charset = USER_MAP;
2036 if (vc->vc_charset == 1)
2037 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2038 vc->vc_state = ESnormal;
2041 vc->vc_state = ESnormal;
2045 /* This is a temporary buffer used to prepare a tty console write
2046 * so that we can easily avoid touching user space while holding the
2047 * console spinlock. It is allocated in con_init and is shared by
2048 * this code and the vc_screen read/write tty calls.
2050 * We have to allocate this statically in the kernel data section
2051 * since console_init (and thus con_init) are called before any
2052 * kernel memory allocation is available.
2054 char con_buf[CON_BUF_SIZE];
2055 DEFINE_MUTEX(con_buf_mtx);
2057 /* is_double_width() is based on the wcwidth() implementation by
2058 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2059 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2066 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2071 if (ucs < table[0].first || ucs > table[max].last)
2073 while (max >= min) {
2074 mid = (min + max) / 2;
2075 if (ucs > table[mid].last)
2077 else if (ucs < table[mid].first)
2085 static int is_double_width(uint32_t ucs)
2087 static const struct interval double_width[] = {
2088 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2089 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2090 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2091 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2093 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2096 /* acquires console_sem */
2097 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2099 #ifdef VT_BUF_VRAM_ONLY
2100 #define FLUSH do { } while(0);
2102 #define FLUSH if (draw_x >= 0) { \
2103 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2108 int c, tc, ok, n = 0, draw_x = -1;
2109 unsigned int currcons;
2110 unsigned long draw_from = 0, draw_to = 0;
2112 unsigned char vc_attr;
2113 struct vt_notifier_param param;
2117 u16 himask, charmask;
2118 const unsigned char *orig_buf = NULL;
2126 acquire_console_sem();
2127 vc = tty->driver_data;
2129 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2130 release_console_sem();
2134 currcons = vc->vc_num;
2135 if (!vc_cons_allocated(currcons)) {
2136 /* could this happen? */
2137 static int error = 0;
2140 printk("con_write: tty %d not allocated\n", currcons+1);
2142 release_console_sem();
2148 himask = vc->vc_hi_font_mask;
2149 charmask = himask ? 0x1ff : 0xff;
2151 /* undraw cursor first */
2157 while (!tty->stopped && count) {
2167 /* Do no translation at all in control states */
2168 if (vc->vc_state != ESnormal) {
2170 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2171 /* Combine UTF-8 into Unicode in vc_utf_char.
2172 * vc_utf_count is the number of continuation bytes still
2173 * expected to arrive.
2174 * vc_npar is the number of continuation bytes arrived so
2178 if ((c & 0xc0) == 0x80) {
2179 /* Continuation byte received */
2180 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2181 if (vc->vc_utf_count) {
2182 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2184 if (--vc->vc_utf_count) {
2185 /* Still need some bytes */
2188 /* Got a whole character */
2189 c = vc->vc_utf_char;
2190 /* Reject overlong sequences */
2191 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2192 c > utf8_length_changes[vc->vc_npar])
2195 /* Unexpected continuation byte */
2196 vc->vc_utf_count = 0;
2200 /* Single ASCII byte or first byte of a sequence received */
2201 if (vc->vc_utf_count) {
2202 /* Continuation byte expected */
2204 vc->vc_utf_count = 0;
2206 } else if (c > 0x7f) {
2207 /* First byte of a multibyte sequence received */
2209 if ((c & 0xe0) == 0xc0) {
2210 vc->vc_utf_count = 1;
2211 vc->vc_utf_char = (c & 0x1f);
2212 } else if ((c & 0xf0) == 0xe0) {
2213 vc->vc_utf_count = 2;
2214 vc->vc_utf_char = (c & 0x0f);
2215 } else if ((c & 0xf8) == 0xf0) {
2216 vc->vc_utf_count = 3;
2217 vc->vc_utf_char = (c & 0x07);
2218 } else if ((c & 0xfc) == 0xf8) {
2219 vc->vc_utf_count = 4;
2220 vc->vc_utf_char = (c & 0x03);
2221 } else if ((c & 0xfe) == 0xfc) {
2222 vc->vc_utf_count = 5;
2223 vc->vc_utf_char = (c & 0x01);
2225 /* 254 and 255 are invalid */
2228 if (vc->vc_utf_count) {
2229 /* Still need some bytes */
2233 /* Nothing to do if an ASCII byte was received */
2235 /* End of UTF-8 decoding. */
2236 /* c is the received character, or U+FFFD for invalid sequences. */
2237 /* Replace invalid Unicode code points with U+FFFD too */
2238 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2241 } else { /* no utf or alternate charset mode */
2242 tc = vc_translate(vc, c);
2246 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2247 ¶m) == NOTIFY_STOP)
2250 /* If the original code was a control character we
2251 * only allow a glyph to be displayed if the code is
2252 * not normally used (such as for cursor movement) or
2253 * if the disp_ctrl mode has been explicitly enabled.
2254 * Certain characters (as given by the CTRL_ALWAYS
2255 * bitmap) are always displayed as control characters,
2256 * as the console would be pretty useless without
2257 * them; to display an arbitrary font position use the
2258 * direct-to-font zone in UTF-8 mode.
2260 ok = tc && (c >= 32 ||
2261 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2262 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2263 && (c != 127 || vc->vc_disp_ctrl)
2266 if (vc->vc_state == ESnormal && ok) {
2267 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2268 if (is_double_width(c))
2271 /* Now try to find out how to display it */
2272 tc = conv_uni_to_pc(vc, tc);
2273 if (tc & ~charmask) {
2274 if (tc == -1 || tc == -2) {
2275 continue; /* nothing to display */
2277 /* Glyph not found */
2278 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2279 /* In legacy mode use the glyph we get by a 1:1 mapping.
2280 This would make absolutely no sense with Unicode in mind,
2281 but do this for ASCII characters since a font may lack
2282 Unicode mapping info and we don't want to end up with
2283 having question marks only. */
2286 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2287 tc = conv_uni_to_pc(vc, 0xfffd);
2290 tc = conv_uni_to_pc(vc, '?');
2291 if (tc < 0) tc = '?';
2297 vc_attr = vc->vc_attr;
2299 /* invert vc_attr */
2300 if (!vc->vc_can_do_color) {
2301 vc_attr = (vc->vc_attr) ^ 0x08;
2302 } else if (vc->vc_hi_font_mask == 0x100) {
2303 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2305 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2311 if (vc->vc_need_wrap || vc->vc_decim)
2313 if (vc->vc_need_wrap) {
2320 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2321 (vc_attr << 8) + tc,
2322 (u16 *) vc->vc_pos);
2323 if (DO_UPDATE(vc) && draw_x < 0) {
2325 draw_from = vc->vc_pos;
2327 if (vc->vc_x == vc->vc_cols - 1) {
2328 vc->vc_need_wrap = vc->vc_decawm;
2329 draw_to = vc->vc_pos + 2;
2332 draw_to = (vc->vc_pos += 2);
2335 if (!--width) break;
2337 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2338 if (tc < 0) tc = ' ';
2340 notify_write(vc, c);
2351 goto rescan_last_byte;
2356 do_con_trol(tty, vc, orig);
2359 console_conditional_schedule();
2360 release_console_sem();
2367 * This is the console switching callback.
2369 * Doing console switching in a process context allows
2370 * us to do the switches asynchronously (needed when we want
2371 * to switch due to a keyboard interrupt). Synchronization
2372 * with other console code and prevention of re-entrancy is
2373 * ensured with console_sem.
2375 static void console_callback(struct work_struct *ignored)
2377 acquire_console_sem();
2379 if (want_console >= 0) {
2380 if (want_console != fg_console &&
2381 vc_cons_allocated(want_console)) {
2382 hide_cursor(vc_cons[fg_console].d);
2383 change_console(vc_cons[want_console].d);
2384 /* we only changed when the console had already
2385 been allocated - a new console is not created
2386 in an interrupt routine */
2390 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2391 do_poke_blanked_console = 0;
2392 poke_blanked_console();
2394 if (scrollback_delta) {
2395 struct vc_data *vc = vc_cons[fg_console].d;
2397 if (vc->vc_mode == KD_TEXT)
2398 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2399 scrollback_delta = 0;
2401 if (blank_timer_expired) {
2403 blank_timer_expired = 0;
2405 notify_update(vc_cons[fg_console].d);
2407 release_console_sem();
2410 int set_console(int nr)
2412 struct vc_data *vc = vc_cons[fg_console].d;
2414 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2415 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2418 * Console switch will fail in console_callback() or
2419 * change_console() so there is no point scheduling
2422 * Existing set_console() users don't check the return
2423 * value so this shouldn't break anything
2429 schedule_console_callback();
2434 struct tty_driver *console_driver;
2436 #ifdef CONFIG_VT_CONSOLE
2439 * Console on virtual terminal
2441 * The console must be locked when we get here.
2444 static void vt_console_print(struct console *co, const char *b, unsigned count)
2446 struct vc_data *vc = vc_cons[fg_console].d;
2448 static DEFINE_SPINLOCK(printing_lock);
2449 const ushort *start;
2453 /* console busy or not yet initialized */
2456 if (!spin_trylock(&printing_lock))
2459 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2460 vc = vc_cons[kmsg_redirect - 1].d;
2462 /* read `x' only after setting currcons properly (otherwise
2463 the `x' macro will read the x of the foreground console). */
2466 if (!vc_cons_allocated(fg_console)) {
2468 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2472 if (vc->vc_mode != KD_TEXT)
2475 /* undraw cursor first */
2479 start = (ushort *)vc->vc_pos;
2481 /* Contrived structure to try to emulate original need_wrap behaviour
2482 * Problems caused when we have need_wrap set on '\n' character */
2485 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2487 if (CON_IS_VISIBLE(vc))
2488 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2490 if (vc->vc_need_wrap)
2494 if (c == 8) { /* backspace */
2496 start = (ushort *)vc->vc_pos;
2503 start = (ushort *)vc->vc_pos;
2505 if (c == 10 || c == 13)
2508 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2509 notify_write(vc, c);
2511 if (myx == vc->vc_cols - 1) {
2512 vc->vc_need_wrap = 1;
2519 if (CON_IS_VISIBLE(vc))
2520 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2522 if (vc->vc_x == vc->vc_cols) {
2524 vc->vc_need_wrap = 1;
2531 spin_unlock(&printing_lock);
2534 static struct tty_driver *vt_console_device(struct console *c, int *index)
2536 *index = c->index ? c->index-1 : fg_console;
2537 return console_driver;
2540 static struct console vt_console_driver = {
2542 .write = vt_console_print,
2543 .device = vt_console_device,
2544 .unblank = unblank_screen,
2545 .flags = CON_PRINTBUFFER,
2551 * Handling of Linux-specific VC ioctls
2555 * Generally a bit racy with respect to console_sem().
2557 * There are some functions which don't need it.
2559 * There are some functions which can sleep for arbitrary periods
2560 * (paste_selection) but we don't need the lock there anyway.
2562 * set_selection has locking, and definitely needs it
2565 int tioclinux(struct tty_struct *tty, unsigned long arg)
2568 char __user *p = (char __user *)arg;
2572 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2574 if (get_user(type, p))
2583 acquire_console_sem();
2584 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2585 release_console_sem();
2587 case TIOCL_PASTESEL:
2588 ret = paste_selection(tty);
2590 case TIOCL_UNBLANKSCREEN:
2591 acquire_console_sem();
2593 release_console_sem();
2595 case TIOCL_SELLOADLUT:
2596 ret = sel_loadlut(p);
2598 case TIOCL_GETSHIFTSTATE:
2601 * Make it possible to react to Shift+Mousebutton.
2602 * Note that 'shift_state' is an undocumented
2603 * kernel-internal variable; programs not closely
2604 * related to the kernel should not use this.
2607 ret = __put_user(data, p);
2609 case TIOCL_GETMOUSEREPORTING:
2610 data = mouse_reporting();
2611 ret = __put_user(data, p);
2613 case TIOCL_SETVESABLANK:
2614 ret = set_vesa_blanking(p);
2616 case TIOCL_GETKMSGREDIRECT:
2617 data = kmsg_redirect;
2618 ret = __put_user(data, p);
2620 case TIOCL_SETKMSGREDIRECT:
2621 if (!capable(CAP_SYS_ADMIN)) {
2624 if (get_user(data, p+1))
2627 kmsg_redirect = data;
2630 case TIOCL_GETFGCONSOLE:
2633 case TIOCL_SCROLLCONSOLE:
2634 if (get_user(lines, (s32 __user *)(p+4))) {
2637 scrollfront(vc_cons[fg_console].d, lines);
2641 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2642 acquire_console_sem();
2645 release_console_sem();
2647 case TIOCL_BLANKEDSCREEN:
2648 ret = console_blanked;
2659 * /dev/ttyN handling
2662 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2666 retval = do_con_write(tty, buf, count);
2667 con_flush_chars(tty);
2672 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2675 return 0; /* n_r3964 calls put_char() from interrupt context */
2676 return do_con_write(tty, &ch, 1);
2679 static int con_write_room(struct tty_struct *tty)
2683 return 32768; /* No limit, really; we're not buffering */
2686 static int con_chars_in_buffer(struct tty_struct *tty)
2688 return 0; /* we're not buffering */
2692 * con_throttle and con_unthrottle are only used for
2693 * paste_selection(), which has to stuff in a large number of
2696 static void con_throttle(struct tty_struct *tty)
2700 static void con_unthrottle(struct tty_struct *tty)
2702 struct vc_data *vc = tty->driver_data;
2704 wake_up_interruptible(&vc->paste_wait);
2708 * Turn the Scroll-Lock LED on when the tty is stopped
2710 static void con_stop(struct tty_struct *tty)
2715 console_num = tty->index;
2716 if (!vc_cons_allocated(console_num))
2718 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2723 * Turn the Scroll-Lock LED off when the console is started
2725 static void con_start(struct tty_struct *tty)
2730 console_num = tty->index;
2731 if (!vc_cons_allocated(console_num))
2733 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2737 static void con_flush_chars(struct tty_struct *tty)
2741 if (in_interrupt()) /* from flush_to_ldisc */
2744 /* if we race with con_close(), vt may be null */
2745 acquire_console_sem();
2746 vc = tty->driver_data;
2749 release_console_sem();
2753 * Allocate the console screen memory.
2755 static int con_open(struct tty_struct *tty, struct file *filp)
2757 unsigned int currcons = tty->index;
2760 acquire_console_sem();
2761 if (tty->driver_data == NULL) {
2762 ret = vc_allocate(currcons);
2764 struct vc_data *vc = vc_cons[currcons].d;
2766 /* Still being freed */
2768 release_console_sem();
2769 return -ERESTARTSYS;
2771 tty->driver_data = vc;
2774 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2775 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2776 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2779 tty->termios->c_iflag |= IUTF8;
2781 tty->termios->c_iflag &= ~IUTF8;
2782 release_console_sem();
2786 release_console_sem();
2790 static void con_close(struct tty_struct *tty, struct file *filp)
2792 /* Nothing to do - we defer to shutdown */
2795 static void con_shutdown(struct tty_struct *tty)
2797 struct vc_data *vc = tty->driver_data;
2799 acquire_console_sem();
2801 release_console_sem();
2805 static int default_italic_color = 2; // green (ASCII)
2806 static int default_underline_color = 3; // cyan (ASCII)
2807 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2808 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2810 static void vc_init(struct vc_data *vc, unsigned int rows,
2811 unsigned int cols, int do_clear)
2817 vc->vc_size_row = cols << 1;
2818 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2821 vc->vc_pos = vc->vc_origin;
2823 for (j=k=0; j<16; j++) {
2824 vc->vc_palette[k++] = default_red[j] ;
2825 vc->vc_palette[k++] = default_grn[j] ;
2826 vc->vc_palette[k++] = default_blu[j] ;
2828 vc->vc_def_color = 0x07; /* white */
2829 vc->vc_ulcolor = default_underline_color;
2830 vc->vc_itcolor = default_italic_color;
2831 vc->vc_halfcolor = 0x08; /* grey */
2832 init_waitqueue_head(&vc->paste_wait);
2833 reset_terminal(vc, do_clear);
2837 * This routine initializes console interrupts, and does nothing
2838 * else. If you want the screen to clear, call tty_write with
2839 * the appropriate escape-sequence.
2842 static int __init con_init(void)
2844 const char *display_desc = NULL;
2846 unsigned int currcons = 0, i;
2848 acquire_console_sem();
2851 display_desc = conswitchp->con_startup();
2852 if (!display_desc) {
2854 release_console_sem();
2858 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2859 struct con_driver *con_driver = ®istered_con_driver[i];
2861 if (con_driver->con == NULL) {
2862 con_driver->con = conswitchp;
2863 con_driver->desc = display_desc;
2864 con_driver->flag = CON_DRIVER_FLAG_INIT;
2865 con_driver->first = 0;
2866 con_driver->last = MAX_NR_CONSOLES - 1;
2871 for (i = 0; i < MAX_NR_CONSOLES; i++)
2872 con_driver_map[i] = conswitchp;
2874 if (blankinterval) {
2875 blank_state = blank_normal_wait;
2876 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2879 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2880 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2881 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2882 visual_init(vc, currcons, 1);
2883 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2884 vc->vc_kmalloced = 0;
2885 vc_init(vc, vc->vc_rows, vc->vc_cols,
2886 currcons || !vc->vc_sw->con_save_screen);
2888 currcons = fg_console = 0;
2889 master_display_fg = vc = vc_cons[currcons].d;
2892 gotoxy(vc, vc->vc_x, vc->vc_y);
2895 printk("Console: %s %s %dx%d",
2896 vc->vc_can_do_color ? "colour" : "mono",
2897 display_desc, vc->vc_cols, vc->vc_rows);
2901 release_console_sem();
2903 #ifdef CONFIG_VT_CONSOLE
2904 register_console(&vt_console_driver);
2908 console_initcall(con_init);
2910 static const struct tty_operations con_ops = {
2914 .write_room = con_write_room,
2915 .put_char = con_put_char,
2916 .flush_chars = con_flush_chars,
2917 .chars_in_buffer = con_chars_in_buffer,
2921 .throttle = con_throttle,
2922 .unthrottle = con_unthrottle,
2923 .resize = vt_resize,
2924 .shutdown = con_shutdown
2927 static struct cdev vc0_cdev;
2929 int __init vty_init(const struct file_operations *console_fops)
2931 cdev_init(&vc0_cdev, console_fops);
2932 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2933 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2934 panic("Couldn't register /dev/tty0 driver\n");
2935 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2939 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2940 if (!console_driver)
2941 panic("Couldn't allocate console driver\n");
2942 console_driver->owner = THIS_MODULE;
2943 console_driver->name = "tty";
2944 console_driver->name_base = 1;
2945 console_driver->major = TTY_MAJOR;
2946 console_driver->minor_start = 1;
2947 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2948 console_driver->init_termios = tty_std_termios;
2950 console_driver->init_termios.c_iflag |= IUTF8;
2951 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2952 tty_set_operations(console_driver, &con_ops);
2953 if (tty_register_driver(console_driver))
2954 panic("Couldn't register console driver\n");
2957 #ifdef CONFIG_PROM_CONSOLE
2960 #ifdef CONFIG_MDA_CONSOLE
2966 #ifndef VT_SINGLE_DRIVER
2967 #include <linux/device.h>
2969 static struct class *vtconsole_class;
2971 static int bind_con_driver(const struct consw *csw, int first, int last,
2974 struct module *owner = csw->owner;
2975 const char *desc = NULL;
2976 struct con_driver *con_driver;
2977 int i, j = -1, k = -1, retval = -ENODEV;
2979 if (!try_module_get(owner))
2982 acquire_console_sem();
2984 /* check if driver is registered */
2985 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2986 con_driver = ®istered_con_driver[i];
2988 if (con_driver->con == csw) {
2989 desc = con_driver->desc;
2998 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3000 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3005 module_put(conswitchp->owner);
3007 __module_get(owner);
3011 first = max(first, con_driver->first);
3012 last = min(last, con_driver->last);
3014 for (i = first; i <= last; i++) {
3016 struct vc_data *vc = vc_cons[i].d;
3018 if (con_driver_map[i])
3019 module_put(con_driver_map[i]->owner);
3020 __module_get(owner);
3021 con_driver_map[i] = csw;
3023 if (!vc || !vc->vc_sw)
3028 if (CON_IS_VISIBLE(vc)) {
3033 old_was_color = vc->vc_can_do_color;
3034 vc->vc_sw->con_deinit(vc);
3035 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3036 visual_init(vc, i, 0);
3040 /* If the console changed between mono <-> color, then
3041 * the attributes in the screenbuf will be wrong. The
3042 * following resets all attributes to something sane.
3044 if (old_was_color != vc->vc_can_do_color)
3045 clear_buffer_attributes(vc);
3048 printk("Console: switching ");
3050 printk("consoles %d-%d ", first+1, last+1);
3052 struct vc_data *vc = vc_cons[j].d;
3054 printk("to %s %s %dx%d\n",
3055 vc->vc_can_do_color ? "colour" : "mono",
3056 desc, vc->vc_cols, vc->vc_rows);
3063 printk("to %s\n", desc);
3067 release_console_sem();
3072 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3073 static int con_is_graphics(const struct consw *csw, int first, int last)
3077 for (i = first; i <= last; i++) {
3078 struct vc_data *vc = vc_cons[i].d;
3080 if (vc && vc->vc_mode == KD_GRAPHICS) {
3090 * unbind_con_driver - unbind a console driver
3091 * @csw: pointer to console driver to unregister
3092 * @first: first in range of consoles that @csw should be unbound from
3093 * @last: last in range of consoles that @csw should be unbound from
3094 * @deflt: should next bound console driver be default after @csw is unbound?
3096 * To unbind a driver from all possible consoles, pass 0 as @first and
3097 * %MAX_NR_CONSOLES as @last.
3099 * @deflt controls whether the console that ends up replacing @csw should be
3100 * the default console.
3103 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3106 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3108 struct module *owner = csw->owner;
3109 const struct consw *defcsw = NULL;
3110 struct con_driver *con_driver = NULL, *con_back = NULL;
3111 int i, retval = -ENODEV;
3113 if (!try_module_get(owner))
3116 acquire_console_sem();
3118 /* check if driver is registered and if it is unbindable */
3119 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3120 con_driver = ®istered_con_driver[i];
3122 if (con_driver->con == csw &&
3123 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3130 release_console_sem();
3136 /* check if backup driver exists */
3137 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3138 con_back = ®istered_con_driver[i];
3140 if (con_back->con &&
3141 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3142 defcsw = con_back->con;
3149 release_console_sem();
3153 if (!con_is_bound(csw)) {
3154 release_console_sem();
3158 first = max(first, con_driver->first);
3159 last = min(last, con_driver->last);
3161 for (i = first; i <= last; i++) {
3162 if (con_driver_map[i] == csw) {
3163 module_put(csw->owner);
3164 con_driver_map[i] = NULL;
3168 if (!con_is_bound(defcsw)) {
3169 const struct consw *defconsw = conswitchp;
3171 defcsw->con_startup();
3172 con_back->flag |= CON_DRIVER_FLAG_INIT;
3174 * vgacon may change the default driver to point
3175 * to dummycon, we restore it here...
3177 conswitchp = defconsw;
3180 if (!con_is_bound(csw))
3181 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3183 release_console_sem();
3184 /* ignore return value, binding should not fail */
3185 bind_con_driver(defcsw, first, last, deflt);
3191 EXPORT_SYMBOL(unbind_con_driver);
3193 static int vt_bind(struct con_driver *con)
3195 const struct consw *defcsw = NULL, *csw = NULL;
3196 int i, more = 1, first = -1, last = -1, deflt = 0;
3198 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3199 con_is_graphics(con->con, con->first, con->last))
3204 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3205 struct con_driver *con = ®istered_con_driver[i];
3207 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3219 for (i = con->first; i <= con->last; i++) {
3220 if (con_driver_map[i] == defcsw) {
3225 } else if (first != -1)
3229 if (first == 0 && last == MAX_NR_CONSOLES -1)
3233 bind_con_driver(csw, first, last, deflt);
3244 static int vt_unbind(struct con_driver *con)
3246 const struct consw *csw = NULL;
3247 int i, more = 1, first = -1, last = -1, deflt = 0;
3249 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3250 con_is_graphics(con->con, con->first, con->last))
3258 for (i = con->first; i <= con->last; i++) {
3259 if (con_driver_map[i] == csw) {
3264 } else if (first != -1)
3268 if (first == 0 && last == MAX_NR_CONSOLES -1)
3272 unbind_con_driver(csw, first, last, deflt);
3283 static inline int vt_bind(struct con_driver *con)
3287 static inline int vt_unbind(struct con_driver *con)
3291 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3293 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3294 const char *buf, size_t count)
3296 struct con_driver *con = dev_get_drvdata(dev);
3297 int bind = simple_strtoul(buf, NULL, 0);
3307 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3310 struct con_driver *con = dev_get_drvdata(dev);
3311 int bind = con_is_bound(con->con);
3313 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3316 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3319 struct con_driver *con = dev_get_drvdata(dev);
3321 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3322 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3327 static struct device_attribute device_attrs[] = {
3328 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3329 __ATTR(name, S_IRUGO, show_name, NULL),
3332 static int vtconsole_init_device(struct con_driver *con)
3337 con->flag |= CON_DRIVER_FLAG_ATTR;
3338 dev_set_drvdata(con->dev, con);
3339 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3340 error = device_create_file(con->dev, &device_attrs[i]);
3347 device_remove_file(con->dev, &device_attrs[i]);
3348 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3354 static void vtconsole_deinit_device(struct con_driver *con)
3358 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3359 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3360 device_remove_file(con->dev, &device_attrs[i]);
3361 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3366 * con_is_bound - checks if driver is bound to the console
3367 * @csw: console driver
3369 * RETURNS: zero if unbound, nonzero if bound
3371 * Drivers can call this and if zero, they should release
3372 * all resources allocated on con_startup()
3374 int con_is_bound(const struct consw *csw)
3378 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3379 if (con_driver_map[i] == csw) {
3387 EXPORT_SYMBOL(con_is_bound);
3390 * register_con_driver - register console driver to console layer
3391 * @csw: console driver
3392 * @first: the first console to take over, minimum value is 0
3393 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3395 * DESCRIPTION: This function registers a console driver which can later
3396 * bind to a range of consoles specified by @first and @last. It will
3397 * also initialize the console driver by calling con_startup().
3399 int register_con_driver(const struct consw *csw, int first, int last)
3401 struct module *owner = csw->owner;
3402 struct con_driver *con_driver;
3406 if (!try_module_get(owner))
3409 acquire_console_sem();
3411 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3412 con_driver = ®istered_con_driver[i];
3414 /* already registered */
3415 if (con_driver->con == csw)
3422 desc = csw->con_startup();
3429 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3430 con_driver = ®istered_con_driver[i];
3432 if (con_driver->con == NULL) {
3433 con_driver->con = csw;
3434 con_driver->desc = desc;
3435 con_driver->node = i;
3436 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3437 CON_DRIVER_FLAG_INIT;
3438 con_driver->first = first;
3439 con_driver->last = last;
3448 con_driver->dev = device_create(vtconsole_class, NULL,
3449 MKDEV(0, con_driver->node),
3453 if (IS_ERR(con_driver->dev)) {
3454 printk(KERN_WARNING "Unable to create device for %s; "
3455 "errno = %ld\n", con_driver->desc,
3456 PTR_ERR(con_driver->dev));
3457 con_driver->dev = NULL;
3459 vtconsole_init_device(con_driver);
3463 release_console_sem();
3467 EXPORT_SYMBOL(register_con_driver);
3470 * unregister_con_driver - unregister console driver from console layer
3471 * @csw: console driver
3473 * DESCRIPTION: All drivers that registers to the console layer must
3474 * call this function upon exit, or if the console driver is in a state
3475 * where it won't be able to handle console services, such as the
3476 * framebuffer console without loaded framebuffer drivers.
3478 * The driver must unbind first prior to unregistration.
3480 int unregister_con_driver(const struct consw *csw)
3482 int i, retval = -ENODEV;
3484 acquire_console_sem();
3486 /* cannot unregister a bound driver */
3487 if (con_is_bound(csw))
3490 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3491 struct con_driver *con_driver = ®istered_con_driver[i];
3493 if (con_driver->con == csw &&
3494 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3495 vtconsole_deinit_device(con_driver);
3496 device_destroy(vtconsole_class,
3497 MKDEV(0, con_driver->node));
3498 con_driver->con = NULL;
3499 con_driver->desc = NULL;
3500 con_driver->dev = NULL;
3501 con_driver->node = 0;
3502 con_driver->flag = 0;
3503 con_driver->first = 0;
3504 con_driver->last = 0;
3510 release_console_sem();
3513 EXPORT_SYMBOL(unregister_con_driver);
3516 * If we support more console drivers, this function is used
3517 * when a driver wants to take over some existing consoles
3518 * and become default driver for newly opened ones.
3520 * take_over_console is basically a register followed by unbind
3522 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3526 err = register_con_driver(csw, first, last);
3529 bind_con_driver(csw, first, last, deflt);
3535 * give_up_console is a wrapper to unregister_con_driver. It will only
3536 * work if driver is fully unbound.
3538 void give_up_console(const struct consw *csw)
3540 unregister_con_driver(csw);
3543 static int __init vtconsole_class_init(void)
3547 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3548 if (IS_ERR(vtconsole_class)) {
3549 printk(KERN_WARNING "Unable to create vt console class; "
3550 "errno = %ld\n", PTR_ERR(vtconsole_class));
3551 vtconsole_class = NULL;
3554 /* Add system drivers to sysfs */
3555 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3556 struct con_driver *con = ®istered_con_driver[i];
3558 if (con->con && !con->dev) {
3559 con->dev = device_create(vtconsole_class, NULL,
3560 MKDEV(0, con->node),
3564 if (IS_ERR(con->dev)) {
3565 printk(KERN_WARNING "Unable to create "
3566 "device for %s; errno = %ld\n",
3567 con->desc, PTR_ERR(con->dev));
3570 vtconsole_init_device(con);
3577 postcore_initcall(vtconsole_class_init);
3585 static int set_vesa_blanking(char __user *p)
3589 if (get_user(mode, p + 1))
3592 vesa_blank_mode = (mode < 4) ? mode : 0;
3596 void do_blank_screen(int entering_gfx)
3598 struct vc_data *vc = vc_cons[fg_console].d;
3601 WARN_CONSOLE_UNLOCKED();
3603 if (console_blanked) {
3604 if (blank_state == blank_vesa_wait) {
3605 blank_state = blank_off;
3606 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3611 /* entering graphics mode? */
3615 vc->vc_sw->con_blank(vc, -1, 1);
3616 console_blanked = fg_console + 1;
3617 blank_state = blank_off;
3622 if (blank_state != blank_normal_wait)
3624 blank_state = blank_off;
3626 /* don't blank graphics */
3627 if (vc->vc_mode != KD_TEXT) {
3628 console_blanked = fg_console + 1;
3633 del_timer_sync(&console_timer);
3634 blank_timer_expired = 0;
3637 /* In case we need to reset origin, blanking hook returns 1 */
3638 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3639 console_blanked = fg_console + 1;
3643 if (console_blank_hook && console_blank_hook(1))
3646 if (vesa_off_interval && vesa_blank_mode) {
3647 blank_state = blank_vesa_wait;
3648 mod_timer(&console_timer, jiffies + vesa_off_interval);
3651 EXPORT_SYMBOL(do_blank_screen);
3654 * Called by timer as well as from vt_console_driver
3656 void do_unblank_screen(int leaving_gfx)
3660 /* This should now always be called from a "sane" (read: can schedule)
3661 * context for the sake of the low level drivers, except in the special
3662 * case of oops_in_progress
3664 if (!oops_in_progress)
3667 WARN_CONSOLE_UNLOCKED();
3670 if (!console_blanked)
3672 if (!vc_cons_allocated(fg_console)) {
3674 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3677 vc = vc_cons[fg_console].d;
3678 if (vc->vc_mode != KD_TEXT)
3679 return; /* but leave console_blanked != 0 */
3681 if (blankinterval) {
3682 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3683 blank_state = blank_normal_wait;
3686 console_blanked = 0;
3687 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3688 /* Low-level driver cannot restore -> do it ourselves */
3690 if (console_blank_hook)
3691 console_blank_hook(0);
3695 EXPORT_SYMBOL(do_unblank_screen);
3698 * This is called by the outside world to cause a forced unblank, mostly for
3699 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3700 * call it with 1 as an argument and so force a mode restore... that may kill
3701 * X or at least garbage the screen but would also make the Oops visible...
3703 void unblank_screen(void)
3705 do_unblank_screen(0);
3709 * We defer the timer blanking to work queue so it can take the console mutex
3710 * (console operations can still happen at irq time, but only from printk which
3711 * has the console mutex. Not perfect yet, but better than no locking
3713 static void blank_screen_t(unsigned long dummy)
3715 if (unlikely(!keventd_up())) {
3716 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3719 blank_timer_expired = 1;
3720 schedule_work(&console_work);
3723 void poke_blanked_console(void)
3725 WARN_CONSOLE_UNLOCKED();
3727 /* Add this so we quickly catch whoever might call us in a non
3728 * safe context. Nowadays, unblank_screen() isn't to be called in
3729 * atomic contexts and is allowed to schedule (with the special case
3730 * of oops_in_progress, but that isn't of any concern for this
3735 /* This isn't perfectly race free, but a race here would be mostly harmless,
3736 * at worse, we'll do a spurrious blank and it's unlikely
3738 del_timer(&console_timer);
3739 blank_timer_expired = 0;
3741 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3743 if (console_blanked)
3745 else if (blankinterval) {
3746 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3747 blank_state = blank_normal_wait;
3755 static void set_palette(struct vc_data *vc)
3757 WARN_CONSOLE_UNLOCKED();
3759 if (vc->vc_mode != KD_GRAPHICS)
3760 vc->vc_sw->con_set_palette(vc, color_table);
3763 static int set_get_cmap(unsigned char __user *arg, int set)
3767 WARN_CONSOLE_UNLOCKED();
3769 for (i = 0; i < 16; i++)
3771 get_user(default_red[i], arg++);
3772 get_user(default_grn[i], arg++);
3773 get_user(default_blu[i], arg++);
3775 put_user(default_red[i], arg++);
3776 put_user(default_grn[i], arg++);
3777 put_user(default_blu[i], arg++);
3780 for (i = 0; i < MAX_NR_CONSOLES; i++)
3781 if (vc_cons_allocated(i)) {
3782 for (j = k = 0; j < 16; j++) {
3783 vc_cons[i].d->vc_palette[k++] = default_red[j];
3784 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3785 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3787 set_palette(vc_cons[i].d);
3794 * Load palette into the DAC registers. arg points to a colour
3795 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3798 int con_set_cmap(unsigned char __user *arg)
3802 acquire_console_sem();
3803 rc = set_get_cmap (arg,1);
3804 release_console_sem();
3809 int con_get_cmap(unsigned char __user *arg)
3813 acquire_console_sem();
3814 rc = set_get_cmap (arg,0);
3815 release_console_sem();
3820 void reset_palette(struct vc_data *vc)
3823 for (j=k=0; j<16; j++) {
3824 vc->vc_palette[k++] = default_red[j];
3825 vc->vc_palette[k++] = default_grn[j];
3826 vc->vc_palette[k++] = default_blu[j];
3834 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3835 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3836 * depending on width) reserved for each character which is kinda wasty, but
3837 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3838 * is upto the actual low-level console-driver convert data into its favorite
3839 * format (maybe we should add a `fontoffset' field to the `display'
3840 * structure so we won't have to convert the fontdata all the time.
3844 #define max_font_size 65536
3846 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3848 struct console_font font;
3852 if (vc->vc_mode != KD_TEXT)
3856 font.data = kmalloc(max_font_size, GFP_KERNEL);
3862 acquire_console_sem();
3863 if (vc->vc_sw->con_font_get)
3864 rc = vc->vc_sw->con_font_get(vc, &font);
3867 release_console_sem();
3872 c = (font.width+7)/8 * 32 * font.charcount;
3874 if (op->data && font.charcount > op->charcount)
3876 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3877 if (font.width > op->width || font.height > op->height)
3880 if (font.width != 8)
3882 else if ((op->height && font.height > op->height) ||
3889 op->height = font.height;
3890 op->width = font.width;
3891 op->charcount = font.charcount;
3893 if (op->data && copy_to_user(op->data, font.data, c))
3901 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3903 struct console_font font;
3907 if (vc->vc_mode != KD_TEXT)
3911 if (op->charcount > 512)
3913 if (!op->height) { /* Need to guess font height [compat] */
3915 u8 __user *charmap = op->data;
3918 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3919 so that we can get rid of this soon */
3920 if (!(op->flags & KD_FONT_FLAG_OLD))
3922 for (h = 32; h > 0; h--)
3923 for (i = 0; i < op->charcount; i++) {
3924 if (get_user(tmp, &charmap[32*i+h-1]))
3933 if (op->width <= 0 || op->width > 32 || op->height > 32)
3935 size = (op->width+7)/8 * 32 * op->charcount;
3936 if (size > max_font_size)
3938 font.charcount = op->charcount;
3939 font.height = op->height;
3940 font.width = op->width;
3941 font.data = kmalloc(size, GFP_KERNEL);
3944 if (copy_from_user(font.data, op->data, size)) {
3948 acquire_console_sem();
3949 if (vc->vc_sw->con_font_set)
3950 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3953 release_console_sem();
3958 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3960 struct console_font font = {.width = op->width, .height = op->height};
3961 char name[MAX_FONT_NAME];
3965 if (vc->vc_mode != KD_TEXT)
3970 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3973 name[MAX_FONT_NAME - 1] = 0;
3975 acquire_console_sem();
3976 if (vc->vc_sw->con_font_default)
3977 rc = vc->vc_sw->con_font_default(vc, &font, s);
3980 release_console_sem();
3982 op->width = font.width;
3983 op->height = font.height;
3988 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3990 int con = op->height;
3993 if (vc->vc_mode != KD_TEXT)
3996 acquire_console_sem();
3997 if (!vc->vc_sw->con_font_copy)
3999 else if (con < 0 || !vc_cons_allocated(con))
4001 else if (con == vc->vc_num) /* nothing to do */
4004 rc = vc->vc_sw->con_font_copy(vc, con);
4005 release_console_sem();
4009 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4012 case KD_FONT_OP_SET:
4013 return con_font_set(vc, op);
4014 case KD_FONT_OP_GET:
4015 return con_font_get(vc, op);
4016 case KD_FONT_OP_SET_DEFAULT:
4017 return con_font_default(vc, op);
4018 case KD_FONT_OP_COPY:
4019 return con_font_copy(vc, op);
4025 * Interface exported to selection and vcs.
4028 /* used by selection */
4029 u16 screen_glyph(struct vc_data *vc, int offset)
4031 u16 w = scr_readw(screenpos(vc, offset, 1));
4034 if (w & vc->vc_hi_font_mask)
4038 EXPORT_SYMBOL_GPL(screen_glyph);
4040 /* used by vcs - note the word offset */
4041 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4043 return screenpos(vc, 2 * w_offset, viewed);
4046 void getconsxy(struct vc_data *vc, unsigned char *p)
4052 void putconsxy(struct vc_data *vc, unsigned char *p)
4055 gotoxy(vc, p[0], p[1]);
4059 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4061 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4062 return softcursor_original;
4063 return scr_readw(org);
4066 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4068 scr_writew(val, org);
4069 if ((unsigned long)org == vc->vc_pos) {
4070 softcursor_original = -1;
4076 * Visible symbols for modules
4079 EXPORT_SYMBOL(color_table);
4080 EXPORT_SYMBOL(default_red);
4081 EXPORT_SYMBOL(default_grn);
4082 EXPORT_SYMBOL(default_blu);
4083 EXPORT_SYMBOL(update_region);
4084 EXPORT_SYMBOL(redraw_screen);
4085 EXPORT_SYMBOL(vc_resize);
4086 EXPORT_SYMBOL(fg_console);
4087 EXPORT_SYMBOL(console_blank_hook);
4088 EXPORT_SYMBOL(console_blanked);
4089 EXPORT_SYMBOL(vc_cons);
4090 #ifndef VT_SINGLE_DRIVER
4091 EXPORT_SYMBOL(take_over_console);
4092 EXPORT_SYMBOL(give_up_console);