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);
164 int global_cursor_default = -1;
165 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
168 * ignore_poke: don't unblank the screen when things are typed. This is
169 * mainly for the privacy of braille terminal users.
171 static int ignore_poke;
173 int do_poke_blanked_console;
176 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
177 static int vesa_off_interval;
178 static int blankinterval = 10*60;
179 core_param(consoleblank, blankinterval, int, 0444);
181 static DECLARE_WORK(console_work, console_callback);
184 * fg_console is the current virtual console,
185 * last_console is the last used one,
186 * want_console is the console we want to switch to,
190 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);
256 * Low-Level Functions
259 #define IS_FG(vc) ((vc)->vc_num == fg_console)
261 #ifdef VT_BUF_VRAM_ONLY
262 #define DO_UPDATE(vc) 0
264 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
272 p = (unsigned short *)(vc->vc_origin + offset);
273 else if (!vc->vc_sw->con_screen_pos)
274 p = (unsigned short *)(vc->vc_visible_origin + offset);
276 p = vc->vc_sw->con_screen_pos(vc, offset);
280 static inline void scrolldelta(int lines)
282 scrollback_delta += lines;
283 schedule_console_callback();
286 void schedule_console_callback(void)
288 schedule_work(&console_work);
291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
293 unsigned short *d, *s;
297 if (b > vc->vc_rows || t >= b || nr < 1)
299 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
301 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
302 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
303 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
304 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
305 vc->vc_size_row * nr);
308 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
315 if (b > vc->vc_rows || t >= b || nr < 1)
317 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
319 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
320 step = vc->vc_cols * nr;
321 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
322 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
327 #ifndef VT_BUF_VRAM_ONLY
328 unsigned int xx, yy, offset;
332 if (!vc->vc_sw->con_getxy) {
333 offset = (start - vc->vc_origin) / 2;
334 xx = offset % vc->vc_cols;
335 yy = offset / vc->vc_cols;
338 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
342 u16 attrib = scr_readw(p) & 0xff00;
345 while (xx < vc->vc_cols && count) {
346 if (attrib != (scr_readw(p) & 0xff00)) {
348 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
351 attrib = scr_readw(p) & 0xff00;
358 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
363 if (vc->vc_sw->con_getxy) {
365 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
371 void update_region(struct vc_data *vc, unsigned long start, int count)
373 WARN_CONSOLE_UNLOCKED();
377 do_update_region(vc, start, count);
382 /* Structure of attributes is hardware-dependent */
384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
385 u8 _underline, u8 _reverse, u8 _italic)
387 if (vc->vc_sw->con_build_attr)
388 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
389 _blink, _underline, _reverse, _italic);
391 #ifndef VT_BUF_VRAM_ONLY
393 * ++roman: I completely changed the attribute format for monochrome
394 * mode (!can_do_color). The formerly used MDA (monochrome display
395 * adapter) format didn't allow the combination of certain effects.
396 * Now the attribute is just a bit vector:
397 * Bit 0..1: intensity (0..2)
404 if (!vc->vc_can_do_color)
407 (_underline ? 4 : 0) |
411 a = (a & 0xF0) | vc->vc_itcolor;
413 a = (a & 0xf0) | vc->vc_ulcolor;
414 else if (_intensity == 0)
415 a = (a & 0xf0) | vc->vc_ulcolor;
417 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
422 if (vc->vc_hi_font_mask == 0x100)
431 static void update_attr(struct vc_data *vc)
433 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
434 vc->vc_blink, vc->vc_underline,
435 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
436 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
439 /* Note: inverting the screen twice should revert to the original state */
440 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
444 WARN_CONSOLE_UNLOCKED();
447 p = screenpos(vc, offset, viewed);
448 if (vc->vc_sw->con_invert_region)
449 vc->vc_sw->con_invert_region(vc, p, count);
450 #ifndef VT_BUF_VRAM_ONLY
456 if (!vc->vc_can_do_color) {
463 } else if (vc->vc_hi_font_mask == 0x100) {
466 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
473 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
481 do_update_region(vc, (unsigned long) p, count);
484 /* used by selection: complement pointer position */
485 void complement_pos(struct vc_data *vc, int offset)
487 static int old_offset = -1;
488 static unsigned short old;
489 static unsigned short oldx, oldy;
491 WARN_CONSOLE_UNLOCKED();
493 if (old_offset != -1 && old_offset >= 0 &&
494 old_offset < vc->vc_screenbuf_size) {
495 scr_writew(old, screenpos(vc, old_offset, 1));
497 vc->vc_sw->con_putc(vc, old, oldy, oldx);
502 if (offset != -1 && offset >= 0 &&
503 offset < vc->vc_screenbuf_size) {
506 p = screenpos(vc, offset, 1);
508 new = old ^ vc->vc_complement_mask;
511 oldx = (offset >> 1) % vc->vc_cols;
512 oldy = (offset >> 1) / vc->vc_cols;
513 vc->vc_sw->con_putc(vc, new, oldy, oldx);
519 static void insert_char(struct vc_data *vc, unsigned int nr)
521 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
523 p = q + vc->vc_cols - nr - vc->vc_x;
525 scr_writew(scr_readw(p), p + nr);
526 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
527 vc->vc_need_wrap = 0;
529 unsigned short oldattr = vc->vc_attr;
530 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
531 vc->vc_cols - vc->vc_x - nr);
532 vc->vc_attr = vc->vc_video_erase_char >> 8;
534 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
535 vc->vc_attr = oldattr;
539 static void delete_char(struct vc_data *vc, unsigned int nr)
541 unsigned int i = vc->vc_x;
542 unsigned short *p = (unsigned short *)vc->vc_pos;
544 while (++i <= vc->vc_cols - nr) {
545 scr_writew(scr_readw(p+nr), p);
548 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
549 vc->vc_need_wrap = 0;
551 unsigned short oldattr = vc->vc_attr;
552 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
553 vc->vc_cols - vc->vc_x - nr);
554 vc->vc_attr = vc->vc_video_erase_char >> 8;
556 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
557 vc->vc_cols - 1 - nr);
558 vc->vc_attr = oldattr;
562 static int softcursor_original;
564 static void add_softcursor(struct vc_data *vc)
566 int i = scr_readw((u16 *) vc->vc_pos);
567 u32 type = vc->vc_cursor_type;
569 if (! (type & 0x10)) return;
570 if (softcursor_original != -1) return;
571 softcursor_original = i;
572 i |= ((type >> 8) & 0xff00 );
573 i ^= ((type) & 0xff00 );
574 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
575 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
576 scr_writew(i, (u16 *) vc->vc_pos);
578 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
581 static void hide_softcursor(struct vc_data *vc)
583 if (softcursor_original != -1) {
584 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
586 vc->vc_sw->con_putc(vc, softcursor_original,
588 softcursor_original = -1;
592 static void hide_cursor(struct vc_data *vc)
596 vc->vc_sw->con_cursor(vc, CM_ERASE);
600 static void set_cursor(struct vc_data *vc)
602 if (!IS_FG(vc) || console_blanked ||
603 vc->vc_mode == KD_GRAPHICS)
609 if ((vc->vc_cursor_type & 0x0f) != 1)
610 vc->vc_sw->con_cursor(vc, CM_DRAW);
615 static void set_origin(struct vc_data *vc)
617 WARN_CONSOLE_UNLOCKED();
619 if (!CON_IS_VISIBLE(vc) ||
620 !vc->vc_sw->con_set_origin ||
621 !vc->vc_sw->con_set_origin(vc))
622 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
623 vc->vc_visible_origin = vc->vc_origin;
624 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
625 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
628 static inline void save_screen(struct vc_data *vc)
630 WARN_CONSOLE_UNLOCKED();
632 if (vc->vc_sw->con_save_screen)
633 vc->vc_sw->con_save_screen(vc);
637 * Redrawing of screen
640 static void clear_buffer_attributes(struct vc_data *vc)
642 unsigned short *p = (unsigned short *)vc->vc_origin;
643 int count = vc->vc_screenbuf_size / 2;
644 int mask = vc->vc_hi_font_mask | 0xff;
646 for (; count > 0; count--, p++) {
647 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
651 void redraw_screen(struct vc_data *vc, int is_switch)
655 WARN_CONSOLE_UNLOCKED();
659 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
664 struct vc_data *old_vc = vc_cons[fg_console].d;
667 if (!CON_IS_VISIBLE(vc))
669 *vc->vc_display_fg = vc;
670 fg_console = vc->vc_num;
672 if (!CON_IS_VISIBLE(old_vc)) {
683 int old_was_color = vc->vc_can_do_color;
686 update = vc->vc_sw->con_switch(vc);
689 * If console changed from mono<->color, the best we can do
690 * is to clear the buffer attributes. As it currently stands,
691 * rebuilding new attributes from the old buffer is not doable
692 * without overly complex code.
694 if (old_was_color != vc->vc_can_do_color) {
696 clear_buffer_attributes(vc);
698 if (update && vc->vc_mode != KD_GRAPHICS)
699 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
704 compute_shiftstate();
710 * Allocation, freeing and resizing of VTs.
713 int vc_cons_allocated(unsigned int i)
715 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
718 static void visual_init(struct vc_data *vc, int num, int init)
720 /* ++Geert: vc->vc_sw->con_init determines console size */
722 module_put(vc->vc_sw->owner);
723 vc->vc_sw = conswitchp;
724 #ifndef VT_SINGLE_DRIVER
725 if (con_driver_map[num])
726 vc->vc_sw = con_driver_map[num];
728 __module_get(vc->vc_sw->owner);
730 vc->vc_display_fg = &master_display_fg;
731 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
732 vc->vc_uni_pagedir = 0;
733 vc->vc_hi_font_mask = 0;
734 vc->vc_complement_mask = 0;
735 vc->vc_can_do_color = 0;
736 vc->vc_sw->con_init(vc, init);
737 if (!vc->vc_complement_mask)
738 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
739 vc->vc_s_complement_mask = vc->vc_complement_mask;
740 vc->vc_size_row = vc->vc_cols << 1;
741 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
744 int vc_allocate(unsigned int currcons) /* return 0 on success */
746 WARN_CONSOLE_UNLOCKED();
748 if (currcons >= MAX_NR_CONSOLES)
750 if (!vc_cons[currcons].d) {
752 struct vt_notifier_param param;
754 /* prevent users from taking too much memory */
755 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
758 /* due to the granularity of kmalloc, we waste some memory here */
759 /* the alloc is done in two steps, to optimize the common situation
760 of a 25x80 console (structsize=216, screenbuf_size=4000) */
761 /* although the numbers above are not valid since long ago, the
762 point is still up-to-date and the comment still has its value
763 even if only as a historical artifact. --mj, July 1998 */
764 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
767 vc_cons[currcons].d = vc;
768 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
769 visual_init(vc, currcons, 1);
770 if (!*vc->vc_uni_pagedir_loc)
771 con_set_default_unimap(vc);
772 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
773 if (!vc->vc_screenbuf) {
775 vc_cons[currcons].d = NULL;
779 /* If no drivers have overridden us and the user didn't pass a
780 boot option, default to displaying the cursor */
781 if (global_cursor_default == -1)
782 global_cursor_default = 1;
784 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
785 vcs_make_sysfs(currcons);
786 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
791 static inline int resize_screen(struct vc_data *vc, int width, int height,
794 /* Resizes the resolution of the display adapater */
797 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
798 err = vc->vc_sw->con_resize(vc, width, height, user);
804 * Change # of rows and columns (0 means unchanged/the size of fg_console)
805 * [this is to be used together with some user program
806 * like resize that changes the hardware videomode]
808 #define VC_RESIZE_MAXCOL (32767)
809 #define VC_RESIZE_MAXROW (32767)
812 * vc_do_resize - resizing method for the tty
813 * @tty: tty being resized
814 * @real_tty: real tty (different to tty if a pty/tty pair)
815 * @vc: virtual console private data
819 * Resize a virtual console, clipping according to the actual constraints.
820 * If the caller passes a tty structure then update the termios winsize
821 * information and perform any neccessary signal handling.
823 * Caller must hold the console semaphore. Takes the termios mutex and
824 * ctrl_lock of the tty IFF a tty is passed.
827 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
828 unsigned int cols, unsigned int lines)
830 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
831 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
832 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
833 unsigned int end, user;
834 unsigned short *newscreen;
836 WARN_CONSOLE_UNLOCKED();
841 user = vc->vc_resize_user;
842 vc->vc_resize_user = 0;
844 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
847 new_cols = (cols ? cols : vc->vc_cols);
848 new_rows = (lines ? lines : vc->vc_rows);
849 new_row_size = new_cols << 1;
850 new_screen_size = new_row_size * new_rows;
852 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
855 newscreen = kmalloc(new_screen_size, GFP_USER);
859 old_rows = vc->vc_rows;
860 old_cols = vc->vc_cols;
861 old_row_size = vc->vc_size_row;
862 old_screen_size = vc->vc_screenbuf_size;
864 err = resize_screen(vc, new_cols, new_rows, user);
870 vc->vc_rows = new_rows;
871 vc->vc_cols = new_cols;
872 vc->vc_size_row = new_row_size;
873 vc->vc_screenbuf_size = new_screen_size;
875 rlth = min(old_row_size, new_row_size);
876 rrem = new_row_size - rlth;
877 old_origin = vc->vc_origin;
878 new_origin = (long) newscreen;
879 new_scr_end = new_origin + new_screen_size;
881 if (vc->vc_y > new_rows) {
882 if (old_rows - vc->vc_y < new_rows) {
884 * Cursor near the bottom, copy contents from the
887 old_origin += (old_rows - new_rows) * old_row_size;
888 end = vc->vc_scr_end;
891 * Cursor is in no man's land, copy 1/2 screenful
892 * from the top and bottom of cursor position
894 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
895 end = old_origin + (old_row_size * new_rows);
899 * Cursor near the top, copy contents from the top of buffer
901 end = (old_rows > new_rows) ? old_origin +
902 (old_row_size * new_rows) :
907 while (old_origin < end) {
908 scr_memcpyw((unsigned short *) new_origin,
909 (unsigned short *) old_origin, rlth);
911 scr_memsetw((void *)(new_origin + rlth),
912 vc->vc_video_erase_char, rrem);
913 old_origin += old_row_size;
914 new_origin += new_row_size;
916 if (new_scr_end > new_origin)
917 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
918 new_scr_end - new_origin);
919 kfree(vc->vc_screenbuf);
920 vc->vc_screenbuf = newscreen;
921 vc->vc_screenbuf_size = new_screen_size;
924 /* do part of a reset_terminal() */
926 vc->vc_bottom = vc->vc_rows;
927 gotoxy(vc, vc->vc_x, vc->vc_y);
931 /* Rewrite the requested winsize data with the actual
934 memset(&ws, 0, sizeof(ws));
935 ws.ws_row = vc->vc_rows;
936 ws.ws_col = vc->vc_cols;
937 ws.ws_ypixel = vc->vc_scan_lines;
938 tty_do_resize(tty, &ws);
941 if (CON_IS_VISIBLE(vc))
943 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
948 * vc_resize - resize a VT
949 * @vc: virtual console
953 * Resize a virtual console as seen from the console end of things. We
954 * use the common vc_do_resize methods to update the structures. The
955 * caller must hold the console sem to protect console internals and
959 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
961 return vc_do_resize(vc->vc_tty, vc, cols, rows);
965 * vt_resize - resize a VT
966 * @tty: tty to resize
967 * @ws: winsize attributes
969 * Resize a virtual terminal. This is called by the tty layer as we
970 * register our own handler for resizing. The mutual helper does all
973 * Takes the console sem and the called methods then take the tty
974 * termios_mutex and the tty ctrl_lock in that order.
976 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
978 struct vc_data *vc = tty->driver_data;
981 acquire_console_sem();
982 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
983 release_console_sem();
987 void vc_deallocate(unsigned int currcons)
989 WARN_CONSOLE_UNLOCKED();
991 if (vc_cons_allocated(currcons)) {
992 struct vc_data *vc = vc_cons[currcons].d;
993 struct vt_notifier_param param = { .vc = vc };
995 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
996 vcs_remove_sysfs(currcons);
997 vc->vc_sw->con_deinit(vc);
999 module_put(vc->vc_sw->owner);
1000 kfree(vc->vc_screenbuf);
1001 if (currcons >= MIN_NR_CONSOLES)
1003 vc_cons[currcons].d = NULL;
1011 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1012 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1013 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1015 #define decarm VC_REPEAT
1016 #define decckm VC_CKMODE
1017 #define kbdapplic VC_APPLIC
1021 * this is what the terminal answers to a ESC-Z or csi0c query.
1023 #define VT100ID "\033[?1;2c"
1024 #define VT102ID "\033[?6c"
1026 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1027 8,12,10,14, 9,13,11,15 };
1029 /* the default colour table, for VGA+ colour systems */
1030 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1031 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1032 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1033 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1034 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1035 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1037 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1038 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1039 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1042 * gotoxy() must verify all boundaries, because the arguments
1043 * might also be negative. If the given position is out of
1044 * bounds, the cursor is placed at the nearest margin.
1046 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1053 if (new_x >= vc->vc_cols)
1054 vc->vc_x = vc->vc_cols - 1;
1061 max_y = vc->vc_bottom;
1064 max_y = vc->vc_rows;
1068 else if (new_y >= max_y)
1069 vc->vc_y = max_y - 1;
1072 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1073 vc->vc_need_wrap = 0;
1076 /* for absolute user moves, when decom is set */
1077 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1079 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1082 void scrollback(struct vc_data *vc, int lines)
1085 lines = vc->vc_rows / 2;
1086 scrolldelta(-lines);
1089 void scrollfront(struct vc_data *vc, int lines)
1092 lines = vc->vc_rows / 2;
1096 static void lf(struct vc_data *vc)
1098 /* don't scroll if above bottom of scrolling region, or
1099 * if below scrolling region
1101 if (vc->vc_y + 1 == vc->vc_bottom)
1102 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1103 else if (vc->vc_y < vc->vc_rows - 1) {
1105 vc->vc_pos += vc->vc_size_row;
1107 vc->vc_need_wrap = 0;
1108 notify_write(vc, '\n');
1111 static void ri(struct vc_data *vc)
1113 /* don't scroll if below top of scrolling region, or
1114 * if above scrolling region
1116 if (vc->vc_y == vc->vc_top)
1117 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1118 else if (vc->vc_y > 0) {
1120 vc->vc_pos -= vc->vc_size_row;
1122 vc->vc_need_wrap = 0;
1125 static inline void cr(struct vc_data *vc)
1127 vc->vc_pos -= vc->vc_x << 1;
1128 vc->vc_need_wrap = vc->vc_x = 0;
1129 notify_write(vc, '\r');
1132 static inline void bs(struct vc_data *vc)
1137 vc->vc_need_wrap = 0;
1138 notify_write(vc, '\b');
1142 static inline void del(struct vc_data *vc)
1147 static void csi_J(struct vc_data *vc, int vpar)
1150 unsigned short * start;
1153 case 0: /* erase from cursor to end of display */
1154 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1155 start = (unsigned short *)vc->vc_pos;
1156 if (DO_UPDATE(vc)) {
1157 /* do in two stages */
1158 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1159 vc->vc_cols - vc->vc_x);
1160 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1161 vc->vc_rows - vc->vc_y - 1,
1165 case 1: /* erase from start to cursor */
1166 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1167 start = (unsigned short *)vc->vc_origin;
1168 if (DO_UPDATE(vc)) {
1169 /* do in two stages */
1170 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1172 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1176 case 2: /* erase whole display */
1177 count = vc->vc_cols * vc->vc_rows;
1178 start = (unsigned short *)vc->vc_origin;
1180 vc->vc_sw->con_clear(vc, 0, 0,
1187 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1188 vc->vc_need_wrap = 0;
1191 static void csi_K(struct vc_data *vc, int vpar)
1194 unsigned short * start;
1197 case 0: /* erase from cursor to end of line */
1198 count = vc->vc_cols - vc->vc_x;
1199 start = (unsigned short *)vc->vc_pos;
1201 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1202 vc->vc_cols - vc->vc_x);
1204 case 1: /* erase from start of line to cursor */
1205 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1206 count = vc->vc_x + 1;
1208 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1211 case 2: /* erase whole line */
1212 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1213 count = vc->vc_cols;
1215 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1221 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1222 vc->vc_need_wrap = 0;
1225 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1231 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1233 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1235 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1236 vc->vc_need_wrap = 0;
1239 static void default_attr(struct vc_data *vc)
1241 vc->vc_intensity = 1;
1243 vc->vc_underline = 0;
1246 vc->vc_color = vc->vc_def_color;
1249 /* console_sem is held */
1250 static void csi_m(struct vc_data *vc)
1254 for (i = 0; i <= vc->vc_npar; i++)
1255 switch (vc->vc_par[i]) {
1256 case 0: /* all attributes off */
1260 vc->vc_intensity = 2;
1263 vc->vc_intensity = 0;
1269 vc->vc_underline = 1;
1277 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1278 * Select primary font, don't display
1279 * control chars if defined, don't set
1282 vc->vc_translate = set_translate(vc->vc_charset == 0
1284 : vc->vc_G1_charset, vc);
1285 vc->vc_disp_ctrl = 0;
1286 vc->vc_toggle_meta = 0;
1288 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1289 * Select first alternate font, lets
1290 * chars < 32 be displayed as ROM chars.
1292 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1293 vc->vc_disp_ctrl = 1;
1294 vc->vc_toggle_meta = 0;
1296 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1297 * Select second alternate font, toggle
1298 * high bit before displaying as ROM char.
1300 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1301 vc->vc_disp_ctrl = 1;
1302 vc->vc_toggle_meta = 1;
1306 vc->vc_intensity = 1;
1312 vc->vc_underline = 0;
1320 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1321 * Enables underscore, white foreground
1322 * with white underscore (Linux - use
1323 * default foreground).
1325 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1326 vc->vc_underline = 1;
1328 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1329 * Disable underline option.
1330 * Reset colour to default? It did this
1333 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1334 vc->vc_underline = 0;
1337 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1340 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1341 vc->vc_color = color_table[vc->vc_par[i] - 30]
1342 | (vc->vc_color & 0xf0);
1343 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1344 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1345 | (vc->vc_color & 0x0f);
1351 static void respond_string(const char *p, struct tty_struct *tty)
1354 tty_insert_flip_char(tty, *p, 0);
1357 con_schedule_flip(tty);
1360 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1364 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1365 respond_string(buf, tty);
1368 static inline void status_report(struct tty_struct *tty)
1370 respond_string("\033[0n", tty); /* Terminal ok */
1373 static inline void respond_ID(struct tty_struct * tty)
1375 respond_string(VT102ID, tty);
1378 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1382 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1384 respond_string(buf, tty);
1387 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1388 int mouse_reporting(void)
1390 return vc_cons[fg_console].d->vc_report_mouse;
1393 /* console_sem is held */
1394 static void set_mode(struct vc_data *vc, int on_off)
1398 for (i = 0; i <= vc->vc_npar; i++)
1400 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1401 case 1: /* Cursor keys send ^[Ox/^[[x */
1403 set_kbd(vc, decckm);
1405 clr_kbd(vc, decckm);
1407 case 3: /* 80/132 mode switch unimplemented */
1408 vc->vc_deccolm = on_off;
1410 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1411 /* this alone does not suffice; some user mode
1412 utility has to change the hardware regs */
1415 case 5: /* Inverted screen on/off */
1416 if (vc->vc_decscnm != on_off) {
1417 vc->vc_decscnm = on_off;
1418 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1422 case 6: /* Origin relative/absolute */
1423 vc->vc_decom = on_off;
1426 case 7: /* Autowrap on/off */
1427 vc->vc_decawm = on_off;
1429 case 8: /* Autorepeat on/off */
1431 set_kbd(vc, decarm);
1433 clr_kbd(vc, decarm);
1436 vc->vc_report_mouse = on_off ? 1 : 0;
1438 case 25: /* Cursor on/off */
1439 vc->vc_deccm = on_off;
1442 vc->vc_report_mouse = on_off ? 2 : 0;
1446 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1447 case 3: /* Monitor (display ctrls) */
1448 vc->vc_disp_ctrl = on_off;
1450 case 4: /* Insert Mode on/off */
1451 vc->vc_decim = on_off;
1453 case 20: /* Lf, Enter == CrLf/Lf */
1463 /* console_sem is held */
1464 static void setterm_command(struct vc_data *vc)
1466 switch(vc->vc_par[0]) {
1467 case 1: /* set color for underline mode */
1468 if (vc->vc_can_do_color &&
1469 vc->vc_par[1] < 16) {
1470 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1471 if (vc->vc_underline)
1475 case 2: /* set color for half intensity mode */
1476 if (vc->vc_can_do_color &&
1477 vc->vc_par[1] < 16) {
1478 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1479 if (vc->vc_intensity == 0)
1483 case 8: /* store colors as defaults */
1484 vc->vc_def_color = vc->vc_attr;
1485 if (vc->vc_hi_font_mask == 0x100)
1486 vc->vc_def_color >>= 1;
1490 case 9: /* set blanking interval */
1491 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1492 poke_blanked_console();
1494 case 10: /* set bell frequency in Hz */
1495 if (vc->vc_npar >= 1)
1496 vc->vc_bell_pitch = vc->vc_par[1];
1498 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1500 case 11: /* set bell duration in msec */
1501 if (vc->vc_npar >= 1)
1502 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1503 vc->vc_par[1] * HZ / 1000 : 0;
1505 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1507 case 12: /* bring specified console to the front */
1508 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1509 set_console(vc->vc_par[1] - 1);
1511 case 13: /* unblank the screen */
1512 poke_blanked_console();
1514 case 14: /* set vesa powerdown interval */
1515 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1517 case 15: /* activate the previous console */
1518 set_console(last_console);
1523 /* console_sem is held */
1524 static void csi_at(struct vc_data *vc, unsigned int nr)
1526 if (nr > vc->vc_cols - vc->vc_x)
1527 nr = vc->vc_cols - vc->vc_x;
1530 insert_char(vc, nr);
1533 /* console_sem is held */
1534 static void csi_L(struct vc_data *vc, unsigned int nr)
1536 if (nr > vc->vc_rows - vc->vc_y)
1537 nr = vc->vc_rows - vc->vc_y;
1540 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1541 vc->vc_need_wrap = 0;
1544 /* console_sem is held */
1545 static void csi_P(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 delete_char(vc, nr);
1554 /* console_sem is held */
1555 static void csi_M(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 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1562 vc->vc_need_wrap = 0;
1565 /* console_sem is held (except via vc_init->reset_terminal */
1566 static void save_cur(struct vc_data *vc)
1568 vc->vc_saved_x = vc->vc_x;
1569 vc->vc_saved_y = vc->vc_y;
1570 vc->vc_s_intensity = vc->vc_intensity;
1571 vc->vc_s_italic = vc->vc_italic;
1572 vc->vc_s_underline = vc->vc_underline;
1573 vc->vc_s_blink = vc->vc_blink;
1574 vc->vc_s_reverse = vc->vc_reverse;
1575 vc->vc_s_charset = vc->vc_charset;
1576 vc->vc_s_color = vc->vc_color;
1577 vc->vc_saved_G0 = vc->vc_G0_charset;
1578 vc->vc_saved_G1 = vc->vc_G1_charset;
1581 /* console_sem is held */
1582 static void restore_cur(struct vc_data *vc)
1584 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1585 vc->vc_intensity = vc->vc_s_intensity;
1586 vc->vc_italic = vc->vc_s_italic;
1587 vc->vc_underline = vc->vc_s_underline;
1588 vc->vc_blink = vc->vc_s_blink;
1589 vc->vc_reverse = vc->vc_s_reverse;
1590 vc->vc_charset = vc->vc_s_charset;
1591 vc->vc_color = vc->vc_s_color;
1592 vc->vc_G0_charset = vc->vc_saved_G0;
1593 vc->vc_G1_charset = vc->vc_saved_G1;
1594 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1596 vc->vc_need_wrap = 0;
1599 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1600 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1603 /* console_sem is held (except via vc_init()) */
1604 static void reset_terminal(struct vc_data *vc, int do_clear)
1607 vc->vc_bottom = vc->vc_rows;
1608 vc->vc_state = ESnormal;
1610 vc->vc_translate = set_translate(LAT1_MAP, vc);
1611 vc->vc_G0_charset = LAT1_MAP;
1612 vc->vc_G1_charset = GRAF_MAP;
1614 vc->vc_need_wrap = 0;
1615 vc->vc_report_mouse = 0;
1616 vc->vc_utf = default_utf8;
1617 vc->vc_utf_count = 0;
1619 vc->vc_disp_ctrl = 0;
1620 vc->vc_toggle_meta = 0;
1625 vc->vc_deccm = global_cursor_default;
1628 set_kbd(vc, decarm);
1629 clr_kbd(vc, decckm);
1630 clr_kbd(vc, kbdapplic);
1632 kbd_table[vc->vc_num].lockstate = 0;
1633 kbd_table[vc->vc_num].slockstate = 0;
1634 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1635 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1636 /* do not do set_leds here because this causes an endless tasklet loop
1637 when the keyboard hasn't been initialized yet */
1639 vc->vc_cursor_type = CUR_DEFAULT;
1640 vc->vc_complement_mask = vc->vc_s_complement_mask;
1645 vc->vc_tab_stop[0] = 0x01010100;
1646 vc->vc_tab_stop[1] =
1647 vc->vc_tab_stop[2] =
1648 vc->vc_tab_stop[3] =
1649 vc->vc_tab_stop[4] =
1650 vc->vc_tab_stop[5] =
1651 vc->vc_tab_stop[6] =
1652 vc->vc_tab_stop[7] = 0x01010101;
1654 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1655 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1663 /* console_sem is held */
1664 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1667 * Control characters can be used in the _middle_
1668 * of an escape sequence.
1674 if (vc->vc_bell_duration)
1675 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1681 vc->vc_pos -= (vc->vc_x << 1);
1682 while (vc->vc_x < vc->vc_cols - 1) {
1684 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1687 vc->vc_pos += (vc->vc_x << 1);
1688 notify_write(vc, '\t');
1690 case 10: case 11: case 12:
1692 if (!is_kbd(vc, lnm))
1699 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1700 vc->vc_disp_ctrl = 1;
1704 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1705 vc->vc_disp_ctrl = 0;
1708 vc->vc_state = ESnormal;
1711 vc->vc_state = ESesc;
1717 vc->vc_state = ESsquare;
1720 switch(vc->vc_state) {
1722 vc->vc_state = ESnormal;
1725 vc->vc_state = ESsquare;
1728 vc->vc_state = ESnonstd;
1731 vc->vc_state = ESpercent;
1744 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1756 vc->vc_state = ESsetG0;
1759 vc->vc_state = ESsetG1;
1762 vc->vc_state = EShash;
1765 reset_terminal(vc, 1);
1767 case '>': /* Numeric keypad */
1768 clr_kbd(vc, kbdapplic);
1770 case '=': /* Appl. keypad */
1771 set_kbd(vc, kbdapplic);
1776 if (c=='P') { /* palette escape sequence */
1777 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1778 vc->vc_par[vc->vc_npar] = 0;
1780 vc->vc_state = ESpalette;
1782 } else if (c=='R') { /* reset palette */
1784 vc->vc_state = ESnormal;
1786 vc->vc_state = ESnormal;
1789 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1790 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1791 if (vc->vc_npar == 7) {
1792 int i = vc->vc_par[0] * 3, j = 1;
1793 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1794 vc->vc_palette[i++] += vc->vc_par[j++];
1795 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1796 vc->vc_palette[i++] += vc->vc_par[j++];
1797 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1798 vc->vc_palette[i] += vc->vc_par[j];
1800 vc->vc_state = ESnormal;
1803 vc->vc_state = ESnormal;
1806 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1807 vc->vc_par[vc->vc_npar] = 0;
1809 vc->vc_state = ESgetpars;
1810 if (c == '[') { /* Function key */
1811 vc->vc_state=ESfunckey;
1814 vc->vc_ques = (c == '?');
1818 if (c == ';' && vc->vc_npar < NPAR - 1) {
1821 } else if (c>='0' && c<='9') {
1822 vc->vc_par[vc->vc_npar] *= 10;
1823 vc->vc_par[vc->vc_npar] += c - '0';
1826 vc->vc_state = ESgotpars;
1828 vc->vc_state = ESnormal;
1839 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1841 vc->vc_cursor_type = CUR_DEFAULT;
1849 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1851 vc->vc_complement_mask = vc->vc_s_complement_mask;
1857 if (vc->vc_par[0] == 5)
1859 else if (vc->vc_par[0] == 6)
1860 cursor_report(vc, tty);
1872 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1877 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1882 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1887 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1892 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1897 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1902 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1907 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1914 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1917 csi_J(vc, vc->vc_par[0]);
1920 csi_K(vc, vc->vc_par[0]);
1923 csi_L(vc, vc->vc_par[0]);
1926 csi_M(vc, vc->vc_par[0]);
1929 csi_P(vc, vc->vc_par[0]);
1937 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1938 else if (vc->vc_par[0] == 3) {
1939 vc->vc_tab_stop[0] =
1940 vc->vc_tab_stop[1] =
1941 vc->vc_tab_stop[2] =
1942 vc->vc_tab_stop[3] =
1943 vc->vc_tab_stop[4] =
1944 vc->vc_tab_stop[5] =
1945 vc->vc_tab_stop[6] =
1946 vc->vc_tab_stop[7] = 0;
1952 case 'q': /* DECLL - but only 3 leds */
1953 /* map 0,1,2,3 to 0,1,2,4 */
1954 if (vc->vc_par[0] < 4)
1955 setledstate(kbd_table + vc->vc_num,
1956 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1962 vc->vc_par[1] = vc->vc_rows;
1963 /* Minimum allowed region is 2 lines */
1964 if (vc->vc_par[0] < vc->vc_par[1] &&
1965 vc->vc_par[1] <= vc->vc_rows) {
1966 vc->vc_top = vc->vc_par[0] - 1;
1967 vc->vc_bottom = vc->vc_par[1];
1978 csi_X(vc, vc->vc_par[0]);
1981 csi_at(vc, vc->vc_par[0]);
1983 case ']': /* setterm functions */
1984 setterm_command(vc);
1989 vc->vc_state = ESnormal;
1991 case '@': /* defined in ISO 2022 */
1994 case 'G': /* prelim official escape code */
1995 case '8': /* retained for compatibility */
2001 vc->vc_state = ESnormal;
2004 vc->vc_state = ESnormal;
2006 /* DEC screen alignment test. kludge :-) */
2007 vc->vc_video_erase_char =
2008 (vc->vc_video_erase_char & 0xff00) | 'E';
2010 vc->vc_video_erase_char =
2011 (vc->vc_video_erase_char & 0xff00) | ' ';
2012 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2017 vc->vc_G0_charset = GRAF_MAP;
2019 vc->vc_G0_charset = LAT1_MAP;
2021 vc->vc_G0_charset = IBMPC_MAP;
2023 vc->vc_G0_charset = USER_MAP;
2024 if (vc->vc_charset == 0)
2025 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2026 vc->vc_state = ESnormal;
2030 vc->vc_G1_charset = GRAF_MAP;
2032 vc->vc_G1_charset = LAT1_MAP;
2034 vc->vc_G1_charset = IBMPC_MAP;
2036 vc->vc_G1_charset = USER_MAP;
2037 if (vc->vc_charset == 1)
2038 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2039 vc->vc_state = ESnormal;
2042 vc->vc_state = ESnormal;
2046 /* This is a temporary buffer used to prepare a tty console write
2047 * so that we can easily avoid touching user space while holding the
2048 * console spinlock. It is allocated in con_init and is shared by
2049 * this code and the vc_screen read/write tty calls.
2051 * We have to allocate this statically in the kernel data section
2052 * since console_init (and thus con_init) are called before any
2053 * kernel memory allocation is available.
2055 char con_buf[CON_BUF_SIZE];
2056 DEFINE_MUTEX(con_buf_mtx);
2058 /* is_double_width() is based on the wcwidth() implementation by
2059 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2060 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2067 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2072 if (ucs < table[0].first || ucs > table[max].last)
2074 while (max >= min) {
2075 mid = (min + max) / 2;
2076 if (ucs > table[mid].last)
2078 else if (ucs < table[mid].first)
2086 static int is_double_width(uint32_t ucs)
2088 static const struct interval double_width[] = {
2089 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2090 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2091 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2092 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2094 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2097 /* acquires console_sem */
2098 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2100 #ifdef VT_BUF_VRAM_ONLY
2101 #define FLUSH do { } while(0);
2103 #define FLUSH if (draw_x >= 0) { \
2104 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2109 int c, tc, ok, n = 0, draw_x = -1;
2110 unsigned int currcons;
2111 unsigned long draw_from = 0, draw_to = 0;
2113 unsigned char vc_attr;
2114 struct vt_notifier_param param;
2118 u16 himask, charmask;
2119 const unsigned char *orig_buf = NULL;
2127 acquire_console_sem();
2128 vc = tty->driver_data;
2130 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2131 release_console_sem();
2135 currcons = vc->vc_num;
2136 if (!vc_cons_allocated(currcons)) {
2137 /* could this happen? */
2138 printk_once("con_write: tty %d not allocated\n", currcons+1);
2139 release_console_sem();
2145 himask = vc->vc_hi_font_mask;
2146 charmask = himask ? 0x1ff : 0xff;
2148 /* undraw cursor first */
2154 while (!tty->stopped && count) {
2164 /* Do no translation at all in control states */
2165 if (vc->vc_state != ESnormal) {
2167 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2168 /* Combine UTF-8 into Unicode in vc_utf_char.
2169 * vc_utf_count is the number of continuation bytes still
2170 * expected to arrive.
2171 * vc_npar is the number of continuation bytes arrived so
2175 if ((c & 0xc0) == 0x80) {
2176 /* Continuation byte received */
2177 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2178 if (vc->vc_utf_count) {
2179 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2181 if (--vc->vc_utf_count) {
2182 /* Still need some bytes */
2185 /* Got a whole character */
2186 c = vc->vc_utf_char;
2187 /* Reject overlong sequences */
2188 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2189 c > utf8_length_changes[vc->vc_npar])
2192 /* Unexpected continuation byte */
2193 vc->vc_utf_count = 0;
2197 /* Single ASCII byte or first byte of a sequence received */
2198 if (vc->vc_utf_count) {
2199 /* Continuation byte expected */
2201 vc->vc_utf_count = 0;
2203 } else if (c > 0x7f) {
2204 /* First byte of a multibyte sequence received */
2206 if ((c & 0xe0) == 0xc0) {
2207 vc->vc_utf_count = 1;
2208 vc->vc_utf_char = (c & 0x1f);
2209 } else if ((c & 0xf0) == 0xe0) {
2210 vc->vc_utf_count = 2;
2211 vc->vc_utf_char = (c & 0x0f);
2212 } else if ((c & 0xf8) == 0xf0) {
2213 vc->vc_utf_count = 3;
2214 vc->vc_utf_char = (c & 0x07);
2215 } else if ((c & 0xfc) == 0xf8) {
2216 vc->vc_utf_count = 4;
2217 vc->vc_utf_char = (c & 0x03);
2218 } else if ((c & 0xfe) == 0xfc) {
2219 vc->vc_utf_count = 5;
2220 vc->vc_utf_char = (c & 0x01);
2222 /* 254 and 255 are invalid */
2225 if (vc->vc_utf_count) {
2226 /* Still need some bytes */
2230 /* Nothing to do if an ASCII byte was received */
2232 /* End of UTF-8 decoding. */
2233 /* c is the received character, or U+FFFD for invalid sequences. */
2234 /* Replace invalid Unicode code points with U+FFFD too */
2235 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2238 } else { /* no utf or alternate charset mode */
2239 tc = vc_translate(vc, c);
2243 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2244 ¶m) == NOTIFY_STOP)
2247 /* If the original code was a control character we
2248 * only allow a glyph to be displayed if the code is
2249 * not normally used (such as for cursor movement) or
2250 * if the disp_ctrl mode has been explicitly enabled.
2251 * Certain characters (as given by the CTRL_ALWAYS
2252 * bitmap) are always displayed as control characters,
2253 * as the console would be pretty useless without
2254 * them; to display an arbitrary font position use the
2255 * direct-to-font zone in UTF-8 mode.
2257 ok = tc && (c >= 32 ||
2258 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2259 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2260 && (c != 127 || vc->vc_disp_ctrl)
2263 if (vc->vc_state == ESnormal && ok) {
2264 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2265 if (is_double_width(c))
2268 /* Now try to find out how to display it */
2269 tc = conv_uni_to_pc(vc, tc);
2270 if (tc & ~charmask) {
2271 if (tc == -1 || tc == -2) {
2272 continue; /* nothing to display */
2274 /* Glyph not found */
2275 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2276 /* In legacy mode use the glyph we get by a 1:1 mapping.
2277 This would make absolutely no sense with Unicode in mind,
2278 but do this for ASCII characters since a font may lack
2279 Unicode mapping info and we don't want to end up with
2280 having question marks only. */
2283 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2284 tc = conv_uni_to_pc(vc, 0xfffd);
2287 tc = conv_uni_to_pc(vc, '?');
2288 if (tc < 0) tc = '?';
2294 vc_attr = vc->vc_attr;
2296 /* invert vc_attr */
2297 if (!vc->vc_can_do_color) {
2298 vc_attr = (vc->vc_attr) ^ 0x08;
2299 } else if (vc->vc_hi_font_mask == 0x100) {
2300 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2302 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2308 if (vc->vc_need_wrap || vc->vc_decim)
2310 if (vc->vc_need_wrap) {
2317 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2318 (vc_attr << 8) + tc,
2319 (u16 *) vc->vc_pos);
2320 if (DO_UPDATE(vc) && draw_x < 0) {
2322 draw_from = vc->vc_pos;
2324 if (vc->vc_x == vc->vc_cols - 1) {
2325 vc->vc_need_wrap = vc->vc_decawm;
2326 draw_to = vc->vc_pos + 2;
2329 draw_to = (vc->vc_pos += 2);
2332 if (!--width) break;
2334 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2335 if (tc < 0) tc = ' ';
2337 notify_write(vc, c);
2348 goto rescan_last_byte;
2353 do_con_trol(tty, vc, orig);
2356 console_conditional_schedule();
2357 release_console_sem();
2364 * This is the console switching callback.
2366 * Doing console switching in a process context allows
2367 * us to do the switches asynchronously (needed when we want
2368 * to switch due to a keyboard interrupt). Synchronization
2369 * with other console code and prevention of re-entrancy is
2370 * ensured with console_sem.
2372 static void console_callback(struct work_struct *ignored)
2374 acquire_console_sem();
2376 if (want_console >= 0) {
2377 if (want_console != fg_console &&
2378 vc_cons_allocated(want_console)) {
2379 hide_cursor(vc_cons[fg_console].d);
2380 change_console(vc_cons[want_console].d);
2381 /* we only changed when the console had already
2382 been allocated - a new console is not created
2383 in an interrupt routine */
2387 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2388 do_poke_blanked_console = 0;
2389 poke_blanked_console();
2391 if (scrollback_delta) {
2392 struct vc_data *vc = vc_cons[fg_console].d;
2394 if (vc->vc_mode == KD_TEXT)
2395 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2396 scrollback_delta = 0;
2398 if (blank_timer_expired) {
2400 blank_timer_expired = 0;
2402 notify_update(vc_cons[fg_console].d);
2404 release_console_sem();
2407 int set_console(int nr)
2409 struct vc_data *vc = vc_cons[fg_console].d;
2411 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2412 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2415 * Console switch will fail in console_callback() or
2416 * change_console() so there is no point scheduling
2419 * Existing set_console() users don't check the return
2420 * value so this shouldn't break anything
2426 schedule_console_callback();
2431 struct tty_driver *console_driver;
2433 #ifdef CONFIG_VT_CONSOLE
2436 * vt_kmsg_redirect() - Sets/gets the kernel message console
2437 * @new: The new virtual terminal number or -1 if the console should stay
2440 * By default, the kernel messages are always printed on the current virtual
2441 * console. However, the user may modify that default with the
2442 * TIOCL_SETKMSGREDIRECT ioctl call.
2444 * This function sets the kernel message console to be @new. It returns the old
2445 * virtual console number. The virtual terminal number 0 (both as parameter and
2446 * return value) means no redirection (i.e. always printed on the currently
2449 * The parameter -1 means that only the current console is returned, but the
2450 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2451 * case to make the code more understandable.
2453 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2454 * the parameter and always returns 0.
2456 int vt_kmsg_redirect(int new)
2458 static int kmsg_con;
2461 return xchg(&kmsg_con, new);
2467 * Console on virtual terminal
2469 * The console must be locked when we get here.
2472 static void vt_console_print(struct console *co, const char *b, unsigned count)
2474 struct vc_data *vc = vc_cons[fg_console].d;
2476 static DEFINE_SPINLOCK(printing_lock);
2477 const ushort *start;
2482 /* console busy or not yet initialized */
2485 if (!spin_trylock(&printing_lock))
2488 kmsg_console = vt_get_kmsg_redirect();
2489 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2490 vc = vc_cons[kmsg_console - 1].d;
2492 /* read `x' only after setting currcons properly (otherwise
2493 the `x' macro will read the x of the foreground console). */
2496 if (!vc_cons_allocated(fg_console)) {
2498 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2502 if (vc->vc_mode != KD_TEXT)
2505 /* undraw cursor first */
2509 start = (ushort *)vc->vc_pos;
2511 /* Contrived structure to try to emulate original need_wrap behaviour
2512 * Problems caused when we have need_wrap set on '\n' character */
2515 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2517 if (CON_IS_VISIBLE(vc))
2518 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2520 if (vc->vc_need_wrap)
2524 if (c == 8) { /* backspace */
2526 start = (ushort *)vc->vc_pos;
2533 start = (ushort *)vc->vc_pos;
2535 if (c == 10 || c == 13)
2538 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2539 notify_write(vc, c);
2541 if (myx == vc->vc_cols - 1) {
2542 vc->vc_need_wrap = 1;
2549 if (CON_IS_VISIBLE(vc))
2550 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2552 if (vc->vc_x == vc->vc_cols) {
2554 vc->vc_need_wrap = 1;
2561 spin_unlock(&printing_lock);
2564 static struct tty_driver *vt_console_device(struct console *c, int *index)
2566 *index = c->index ? c->index-1 : fg_console;
2567 return console_driver;
2570 static struct console vt_console_driver = {
2572 .write = vt_console_print,
2573 .device = vt_console_device,
2574 .unblank = unblank_screen,
2575 .flags = CON_PRINTBUFFER,
2581 * Handling of Linux-specific VC ioctls
2585 * Generally a bit racy with respect to console_sem().
2587 * There are some functions which don't need it.
2589 * There are some functions which can sleep for arbitrary periods
2590 * (paste_selection) but we don't need the lock there anyway.
2592 * set_selection has locking, and definitely needs it
2595 int tioclinux(struct tty_struct *tty, unsigned long arg)
2598 char __user *p = (char __user *)arg;
2602 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2604 if (get_user(type, p))
2613 acquire_console_sem();
2614 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2615 release_console_sem();
2617 case TIOCL_PASTESEL:
2618 ret = paste_selection(tty);
2620 case TIOCL_UNBLANKSCREEN:
2621 acquire_console_sem();
2623 release_console_sem();
2625 case TIOCL_SELLOADLUT:
2626 ret = sel_loadlut(p);
2628 case TIOCL_GETSHIFTSTATE:
2631 * Make it possible to react to Shift+Mousebutton.
2632 * Note that 'shift_state' is an undocumented
2633 * kernel-internal variable; programs not closely
2634 * related to the kernel should not use this.
2637 ret = __put_user(data, p);
2639 case TIOCL_GETMOUSEREPORTING:
2640 data = mouse_reporting();
2641 ret = __put_user(data, p);
2643 case TIOCL_SETVESABLANK:
2644 ret = set_vesa_blanking(p);
2646 case TIOCL_GETKMSGREDIRECT:
2647 data = vt_get_kmsg_redirect();
2648 ret = __put_user(data, p);
2650 case TIOCL_SETKMSGREDIRECT:
2651 if (!capable(CAP_SYS_ADMIN)) {
2654 if (get_user(data, p+1))
2657 vt_kmsg_redirect(data);
2660 case TIOCL_GETFGCONSOLE:
2663 case TIOCL_SCROLLCONSOLE:
2664 if (get_user(lines, (s32 __user *)(p+4))) {
2667 scrollfront(vc_cons[fg_console].d, lines);
2671 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2672 acquire_console_sem();
2675 release_console_sem();
2677 case TIOCL_BLANKEDSCREEN:
2678 ret = console_blanked;
2689 * /dev/ttyN handling
2692 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2696 retval = do_con_write(tty, buf, count);
2697 con_flush_chars(tty);
2702 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2705 return 0; /* n_r3964 calls put_char() from interrupt context */
2706 return do_con_write(tty, &ch, 1);
2709 static int con_write_room(struct tty_struct *tty)
2713 return 32768; /* No limit, really; we're not buffering */
2716 static int con_chars_in_buffer(struct tty_struct *tty)
2718 return 0; /* we're not buffering */
2722 * con_throttle and con_unthrottle are only used for
2723 * paste_selection(), which has to stuff in a large number of
2726 static void con_throttle(struct tty_struct *tty)
2730 static void con_unthrottle(struct tty_struct *tty)
2732 struct vc_data *vc = tty->driver_data;
2734 wake_up_interruptible(&vc->paste_wait);
2738 * Turn the Scroll-Lock LED on when the tty is stopped
2740 static void con_stop(struct tty_struct *tty)
2745 console_num = tty->index;
2746 if (!vc_cons_allocated(console_num))
2748 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2753 * Turn the Scroll-Lock LED off when the console is started
2755 static void con_start(struct tty_struct *tty)
2760 console_num = tty->index;
2761 if (!vc_cons_allocated(console_num))
2763 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2767 static void con_flush_chars(struct tty_struct *tty)
2771 if (in_interrupt()) /* from flush_to_ldisc */
2774 /* if we race with con_close(), vt may be null */
2775 acquire_console_sem();
2776 vc = tty->driver_data;
2779 release_console_sem();
2783 * Allocate the console screen memory.
2785 static int con_open(struct tty_struct *tty, struct file *filp)
2787 unsigned int currcons = tty->index;
2790 acquire_console_sem();
2791 if (tty->driver_data == NULL) {
2792 ret = vc_allocate(currcons);
2794 struct vc_data *vc = vc_cons[currcons].d;
2796 /* Still being freed */
2798 release_console_sem();
2799 return -ERESTARTSYS;
2801 tty->driver_data = vc;
2804 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2805 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2806 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2809 tty->termios->c_iflag |= IUTF8;
2811 tty->termios->c_iflag &= ~IUTF8;
2812 release_console_sem();
2816 release_console_sem();
2820 static void con_close(struct tty_struct *tty, struct file *filp)
2822 /* Nothing to do - we defer to shutdown */
2825 static void con_shutdown(struct tty_struct *tty)
2827 struct vc_data *vc = tty->driver_data;
2829 acquire_console_sem();
2831 release_console_sem();
2835 static int default_italic_color = 2; // green (ASCII)
2836 static int default_underline_color = 3; // cyan (ASCII)
2837 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2838 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2840 static void vc_init(struct vc_data *vc, unsigned int rows,
2841 unsigned int cols, int do_clear)
2847 vc->vc_size_row = cols << 1;
2848 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2851 vc->vc_pos = vc->vc_origin;
2853 for (j=k=0; j<16; j++) {
2854 vc->vc_palette[k++] = default_red[j] ;
2855 vc->vc_palette[k++] = default_grn[j] ;
2856 vc->vc_palette[k++] = default_blu[j] ;
2858 vc->vc_def_color = 0x07; /* white */
2859 vc->vc_ulcolor = default_underline_color;
2860 vc->vc_itcolor = default_italic_color;
2861 vc->vc_halfcolor = 0x08; /* grey */
2862 init_waitqueue_head(&vc->paste_wait);
2863 reset_terminal(vc, do_clear);
2867 * This routine initializes console interrupts, and does nothing
2868 * else. If you want the screen to clear, call tty_write with
2869 * the appropriate escape-sequence.
2872 static int __init con_init(void)
2874 const char *display_desc = NULL;
2876 unsigned int currcons = 0, i;
2878 acquire_console_sem();
2881 display_desc = conswitchp->con_startup();
2882 if (!display_desc) {
2884 release_console_sem();
2888 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2889 struct con_driver *con_driver = ®istered_con_driver[i];
2891 if (con_driver->con == NULL) {
2892 con_driver->con = conswitchp;
2893 con_driver->desc = display_desc;
2894 con_driver->flag = CON_DRIVER_FLAG_INIT;
2895 con_driver->first = 0;
2896 con_driver->last = MAX_NR_CONSOLES - 1;
2901 for (i = 0; i < MAX_NR_CONSOLES; i++)
2902 con_driver_map[i] = conswitchp;
2904 if (blankinterval) {
2905 blank_state = blank_normal_wait;
2906 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2909 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2910 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2911 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2912 visual_init(vc, currcons, 1);
2913 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2914 vc_init(vc, vc->vc_rows, vc->vc_cols,
2915 currcons || !vc->vc_sw->con_save_screen);
2917 currcons = fg_console = 0;
2918 master_display_fg = vc = vc_cons[currcons].d;
2921 gotoxy(vc, vc->vc_x, vc->vc_y);
2924 printk("Console: %s %s %dx%d",
2925 vc->vc_can_do_color ? "colour" : "mono",
2926 display_desc, vc->vc_cols, vc->vc_rows);
2930 release_console_sem();
2932 #ifdef CONFIG_VT_CONSOLE
2933 register_console(&vt_console_driver);
2937 console_initcall(con_init);
2939 static const struct tty_operations con_ops = {
2943 .write_room = con_write_room,
2944 .put_char = con_put_char,
2945 .flush_chars = con_flush_chars,
2946 .chars_in_buffer = con_chars_in_buffer,
2948 #ifdef CONFIG_COMPAT
2949 .compat_ioctl = vt_compat_ioctl,
2953 .throttle = con_throttle,
2954 .unthrottle = con_unthrottle,
2955 .resize = vt_resize,
2956 .shutdown = con_shutdown
2959 static struct cdev vc0_cdev;
2961 int __init vty_init(const struct file_operations *console_fops)
2963 cdev_init(&vc0_cdev, console_fops);
2964 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2965 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2966 panic("Couldn't register /dev/tty0 driver\n");
2967 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2971 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2972 if (!console_driver)
2973 panic("Couldn't allocate console driver\n");
2974 console_driver->owner = THIS_MODULE;
2975 console_driver->name = "tty";
2976 console_driver->name_base = 1;
2977 console_driver->major = TTY_MAJOR;
2978 console_driver->minor_start = 1;
2979 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2980 console_driver->init_termios = tty_std_termios;
2982 console_driver->init_termios.c_iflag |= IUTF8;
2983 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2984 tty_set_operations(console_driver, &con_ops);
2985 if (tty_register_driver(console_driver))
2986 panic("Couldn't register console driver\n");
2989 #ifdef CONFIG_MDA_CONSOLE
2995 #ifndef VT_SINGLE_DRIVER
2997 static struct class *vtconsole_class;
2999 static int bind_con_driver(const struct consw *csw, int first, int last,
3002 struct module *owner = csw->owner;
3003 const char *desc = NULL;
3004 struct con_driver *con_driver;
3005 int i, j = -1, k = -1, retval = -ENODEV;
3007 if (!try_module_get(owner))
3010 acquire_console_sem();
3012 /* check if driver is registered */
3013 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3014 con_driver = ®istered_con_driver[i];
3016 if (con_driver->con == csw) {
3017 desc = con_driver->desc;
3026 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3028 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3033 module_put(conswitchp->owner);
3035 __module_get(owner);
3039 first = max(first, con_driver->first);
3040 last = min(last, con_driver->last);
3042 for (i = first; i <= last; i++) {
3044 struct vc_data *vc = vc_cons[i].d;
3046 if (con_driver_map[i])
3047 module_put(con_driver_map[i]->owner);
3048 __module_get(owner);
3049 con_driver_map[i] = csw;
3051 if (!vc || !vc->vc_sw)
3056 if (CON_IS_VISIBLE(vc)) {
3061 old_was_color = vc->vc_can_do_color;
3062 vc->vc_sw->con_deinit(vc);
3063 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3064 visual_init(vc, i, 0);
3068 /* If the console changed between mono <-> color, then
3069 * the attributes in the screenbuf will be wrong. The
3070 * following resets all attributes to something sane.
3072 if (old_was_color != vc->vc_can_do_color)
3073 clear_buffer_attributes(vc);
3076 printk("Console: switching ");
3078 printk("consoles %d-%d ", first+1, last+1);
3080 struct vc_data *vc = vc_cons[j].d;
3082 printk("to %s %s %dx%d\n",
3083 vc->vc_can_do_color ? "colour" : "mono",
3084 desc, vc->vc_cols, vc->vc_rows);
3091 printk("to %s\n", desc);
3095 release_console_sem();
3100 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3101 static int con_is_graphics(const struct consw *csw, int first, int last)
3105 for (i = first; i <= last; i++) {
3106 struct vc_data *vc = vc_cons[i].d;
3108 if (vc && vc->vc_mode == KD_GRAPHICS) {
3118 * unbind_con_driver - unbind a console driver
3119 * @csw: pointer to console driver to unregister
3120 * @first: first in range of consoles that @csw should be unbound from
3121 * @last: last in range of consoles that @csw should be unbound from
3122 * @deflt: should next bound console driver be default after @csw is unbound?
3124 * To unbind a driver from all possible consoles, pass 0 as @first and
3125 * %MAX_NR_CONSOLES as @last.
3127 * @deflt controls whether the console that ends up replacing @csw should be
3128 * the default console.
3131 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3134 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3136 struct module *owner = csw->owner;
3137 const struct consw *defcsw = NULL;
3138 struct con_driver *con_driver = NULL, *con_back = NULL;
3139 int i, retval = -ENODEV;
3141 if (!try_module_get(owner))
3144 acquire_console_sem();
3146 /* check if driver is registered and if it is unbindable */
3147 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3148 con_driver = ®istered_con_driver[i];
3150 if (con_driver->con == csw &&
3151 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3158 release_console_sem();
3164 /* check if backup driver exists */
3165 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3166 con_back = ®istered_con_driver[i];
3168 if (con_back->con &&
3169 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3170 defcsw = con_back->con;
3177 release_console_sem();
3181 if (!con_is_bound(csw)) {
3182 release_console_sem();
3186 first = max(first, con_driver->first);
3187 last = min(last, con_driver->last);
3189 for (i = first; i <= last; i++) {
3190 if (con_driver_map[i] == csw) {
3191 module_put(csw->owner);
3192 con_driver_map[i] = NULL;
3196 if (!con_is_bound(defcsw)) {
3197 const struct consw *defconsw = conswitchp;
3199 defcsw->con_startup();
3200 con_back->flag |= CON_DRIVER_FLAG_INIT;
3202 * vgacon may change the default driver to point
3203 * to dummycon, we restore it here...
3205 conswitchp = defconsw;
3208 if (!con_is_bound(csw))
3209 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3211 release_console_sem();
3212 /* ignore return value, binding should not fail */
3213 bind_con_driver(defcsw, first, last, deflt);
3219 EXPORT_SYMBOL(unbind_con_driver);
3221 static int vt_bind(struct con_driver *con)
3223 const struct consw *defcsw = NULL, *csw = NULL;
3224 int i, more = 1, first = -1, last = -1, deflt = 0;
3226 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3227 con_is_graphics(con->con, con->first, con->last))
3232 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3233 struct con_driver *con = ®istered_con_driver[i];
3235 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3247 for (i = con->first; i <= con->last; i++) {
3248 if (con_driver_map[i] == defcsw) {
3253 } else if (first != -1)
3257 if (first == 0 && last == MAX_NR_CONSOLES -1)
3261 bind_con_driver(csw, first, last, deflt);
3272 static int vt_unbind(struct con_driver *con)
3274 const struct consw *csw = NULL;
3275 int i, more = 1, first = -1, last = -1, deflt = 0;
3277 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3278 con_is_graphics(con->con, con->first, con->last))
3286 for (i = con->first; i <= con->last; i++) {
3287 if (con_driver_map[i] == csw) {
3292 } else if (first != -1)
3296 if (first == 0 && last == MAX_NR_CONSOLES -1)
3300 unbind_con_driver(csw, first, last, deflt);
3311 static inline int vt_bind(struct con_driver *con)
3315 static inline int vt_unbind(struct con_driver *con)
3319 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3321 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3322 const char *buf, size_t count)
3324 struct con_driver *con = dev_get_drvdata(dev);
3325 int bind = simple_strtoul(buf, NULL, 0);
3335 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3338 struct con_driver *con = dev_get_drvdata(dev);
3339 int bind = con_is_bound(con->con);
3341 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3344 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3347 struct con_driver *con = dev_get_drvdata(dev);
3349 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3350 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3355 static struct device_attribute device_attrs[] = {
3356 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3357 __ATTR(name, S_IRUGO, show_name, NULL),
3360 static int vtconsole_init_device(struct con_driver *con)
3365 con->flag |= CON_DRIVER_FLAG_ATTR;
3366 dev_set_drvdata(con->dev, con);
3367 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3368 error = device_create_file(con->dev, &device_attrs[i]);
3375 device_remove_file(con->dev, &device_attrs[i]);
3376 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3382 static void vtconsole_deinit_device(struct con_driver *con)
3386 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3387 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3388 device_remove_file(con->dev, &device_attrs[i]);
3389 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3394 * con_is_bound - checks if driver is bound to the console
3395 * @csw: console driver
3397 * RETURNS: zero if unbound, nonzero if bound
3399 * Drivers can call this and if zero, they should release
3400 * all resources allocated on con_startup()
3402 int con_is_bound(const struct consw *csw)
3406 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3407 if (con_driver_map[i] == csw) {
3415 EXPORT_SYMBOL(con_is_bound);
3418 * register_con_driver - register console driver to console layer
3419 * @csw: console driver
3420 * @first: the first console to take over, minimum value is 0
3421 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3423 * DESCRIPTION: This function registers a console driver which can later
3424 * bind to a range of consoles specified by @first and @last. It will
3425 * also initialize the console driver by calling con_startup().
3427 int register_con_driver(const struct consw *csw, int first, int last)
3429 struct module *owner = csw->owner;
3430 struct con_driver *con_driver;
3434 if (!try_module_get(owner))
3437 acquire_console_sem();
3439 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3440 con_driver = ®istered_con_driver[i];
3442 /* already registered */
3443 if (con_driver->con == csw)
3450 desc = csw->con_startup();
3457 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3458 con_driver = ®istered_con_driver[i];
3460 if (con_driver->con == NULL) {
3461 con_driver->con = csw;
3462 con_driver->desc = desc;
3463 con_driver->node = i;
3464 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3465 CON_DRIVER_FLAG_INIT;
3466 con_driver->first = first;
3467 con_driver->last = last;
3476 con_driver->dev = device_create(vtconsole_class, NULL,
3477 MKDEV(0, con_driver->node),
3481 if (IS_ERR(con_driver->dev)) {
3482 printk(KERN_WARNING "Unable to create device for %s; "
3483 "errno = %ld\n", con_driver->desc,
3484 PTR_ERR(con_driver->dev));
3485 con_driver->dev = NULL;
3487 vtconsole_init_device(con_driver);
3491 release_console_sem();
3495 EXPORT_SYMBOL(register_con_driver);
3498 * unregister_con_driver - unregister console driver from console layer
3499 * @csw: console driver
3501 * DESCRIPTION: All drivers that registers to the console layer must
3502 * call this function upon exit, or if the console driver is in a state
3503 * where it won't be able to handle console services, such as the
3504 * framebuffer console without loaded framebuffer drivers.
3506 * The driver must unbind first prior to unregistration.
3508 int unregister_con_driver(const struct consw *csw)
3510 int i, retval = -ENODEV;
3512 acquire_console_sem();
3514 /* cannot unregister a bound driver */
3515 if (con_is_bound(csw))
3518 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3519 struct con_driver *con_driver = ®istered_con_driver[i];
3521 if (con_driver->con == csw &&
3522 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3523 vtconsole_deinit_device(con_driver);
3524 device_destroy(vtconsole_class,
3525 MKDEV(0, con_driver->node));
3526 con_driver->con = NULL;
3527 con_driver->desc = NULL;
3528 con_driver->dev = NULL;
3529 con_driver->node = 0;
3530 con_driver->flag = 0;
3531 con_driver->first = 0;
3532 con_driver->last = 0;
3538 release_console_sem();
3541 EXPORT_SYMBOL(unregister_con_driver);
3544 * If we support more console drivers, this function is used
3545 * when a driver wants to take over some existing consoles
3546 * and become default driver for newly opened ones.
3548 * take_over_console is basically a register followed by unbind
3550 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3554 err = register_con_driver(csw, first, last);
3557 bind_con_driver(csw, first, last, deflt);
3563 * give_up_console is a wrapper to unregister_con_driver. It will only
3564 * work if driver is fully unbound.
3566 void give_up_console(const struct consw *csw)
3568 unregister_con_driver(csw);
3571 static int __init vtconsole_class_init(void)
3575 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3576 if (IS_ERR(vtconsole_class)) {
3577 printk(KERN_WARNING "Unable to create vt console class; "
3578 "errno = %ld\n", PTR_ERR(vtconsole_class));
3579 vtconsole_class = NULL;
3582 /* Add system drivers to sysfs */
3583 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3584 struct con_driver *con = ®istered_con_driver[i];
3586 if (con->con && !con->dev) {
3587 con->dev = device_create(vtconsole_class, NULL,
3588 MKDEV(0, con->node),
3592 if (IS_ERR(con->dev)) {
3593 printk(KERN_WARNING "Unable to create "
3594 "device for %s; errno = %ld\n",
3595 con->desc, PTR_ERR(con->dev));
3598 vtconsole_init_device(con);
3605 postcore_initcall(vtconsole_class_init);
3613 static int set_vesa_blanking(char __user *p)
3617 if (get_user(mode, p + 1))
3620 vesa_blank_mode = (mode < 4) ? mode : 0;
3624 void do_blank_screen(int entering_gfx)
3626 struct vc_data *vc = vc_cons[fg_console].d;
3629 WARN_CONSOLE_UNLOCKED();
3631 if (console_blanked) {
3632 if (blank_state == blank_vesa_wait) {
3633 blank_state = blank_off;
3634 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3639 /* entering graphics mode? */
3643 vc->vc_sw->con_blank(vc, -1, 1);
3644 console_blanked = fg_console + 1;
3645 blank_state = blank_off;
3650 if (blank_state != blank_normal_wait)
3652 blank_state = blank_off;
3654 /* don't blank graphics */
3655 if (vc->vc_mode != KD_TEXT) {
3656 console_blanked = fg_console + 1;
3661 del_timer_sync(&console_timer);
3662 blank_timer_expired = 0;
3665 /* In case we need to reset origin, blanking hook returns 1 */
3666 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3667 console_blanked = fg_console + 1;
3671 if (console_blank_hook && console_blank_hook(1))
3674 if (vesa_off_interval && vesa_blank_mode) {
3675 blank_state = blank_vesa_wait;
3676 mod_timer(&console_timer, jiffies + vesa_off_interval);
3678 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3680 EXPORT_SYMBOL(do_blank_screen);
3683 * Called by timer as well as from vt_console_driver
3685 void do_unblank_screen(int leaving_gfx)
3689 /* This should now always be called from a "sane" (read: can schedule)
3690 * context for the sake of the low level drivers, except in the special
3691 * case of oops_in_progress
3693 if (!oops_in_progress)
3696 WARN_CONSOLE_UNLOCKED();
3699 if (!console_blanked)
3701 if (!vc_cons_allocated(fg_console)) {
3703 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3706 vc = vc_cons[fg_console].d;
3707 if (vc->vc_mode != KD_TEXT)
3708 return; /* but leave console_blanked != 0 */
3710 if (blankinterval) {
3711 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3712 blank_state = blank_normal_wait;
3715 console_blanked = 0;
3716 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3717 /* Low-level driver cannot restore -> do it ourselves */
3719 if (console_blank_hook)
3720 console_blank_hook(0);
3723 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3725 EXPORT_SYMBOL(do_unblank_screen);
3728 * This is called by the outside world to cause a forced unblank, mostly for
3729 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3730 * call it with 1 as an argument and so force a mode restore... that may kill
3731 * X or at least garbage the screen but would also make the Oops visible...
3733 void unblank_screen(void)
3735 do_unblank_screen(0);
3739 * We defer the timer blanking to work queue so it can take the console mutex
3740 * (console operations can still happen at irq time, but only from printk which
3741 * has the console mutex. Not perfect yet, but better than no locking
3743 static void blank_screen_t(unsigned long dummy)
3745 if (unlikely(!keventd_up())) {
3746 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3749 blank_timer_expired = 1;
3750 schedule_work(&console_work);
3753 void poke_blanked_console(void)
3755 WARN_CONSOLE_UNLOCKED();
3757 /* Add this so we quickly catch whoever might call us in a non
3758 * safe context. Nowadays, unblank_screen() isn't to be called in
3759 * atomic contexts and is allowed to schedule (with the special case
3760 * of oops_in_progress, but that isn't of any concern for this
3765 /* This isn't perfectly race free, but a race here would be mostly harmless,
3766 * at worse, we'll do a spurrious blank and it's unlikely
3768 del_timer(&console_timer);
3769 blank_timer_expired = 0;
3771 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3773 if (console_blanked)
3775 else if (blankinterval) {
3776 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3777 blank_state = blank_normal_wait;
3785 static void set_palette(struct vc_data *vc)
3787 WARN_CONSOLE_UNLOCKED();
3789 if (vc->vc_mode != KD_GRAPHICS)
3790 vc->vc_sw->con_set_palette(vc, color_table);
3793 static int set_get_cmap(unsigned char __user *arg, int set)
3797 WARN_CONSOLE_UNLOCKED();
3799 for (i = 0; i < 16; i++)
3801 get_user(default_red[i], arg++);
3802 get_user(default_grn[i], arg++);
3803 get_user(default_blu[i], arg++);
3805 put_user(default_red[i], arg++);
3806 put_user(default_grn[i], arg++);
3807 put_user(default_blu[i], arg++);
3810 for (i = 0; i < MAX_NR_CONSOLES; i++)
3811 if (vc_cons_allocated(i)) {
3812 for (j = k = 0; j < 16; j++) {
3813 vc_cons[i].d->vc_palette[k++] = default_red[j];
3814 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3815 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3817 set_palette(vc_cons[i].d);
3824 * Load palette into the DAC registers. arg points to a colour
3825 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3828 int con_set_cmap(unsigned char __user *arg)
3832 acquire_console_sem();
3833 rc = set_get_cmap (arg,1);
3834 release_console_sem();
3839 int con_get_cmap(unsigned char __user *arg)
3843 acquire_console_sem();
3844 rc = set_get_cmap (arg,0);
3845 release_console_sem();
3850 void reset_palette(struct vc_data *vc)
3853 for (j=k=0; j<16; j++) {
3854 vc->vc_palette[k++] = default_red[j];
3855 vc->vc_palette[k++] = default_grn[j];
3856 vc->vc_palette[k++] = default_blu[j];
3864 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3865 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3866 * depending on width) reserved for each character which is kinda wasty, but
3867 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3868 * is upto the actual low-level console-driver convert data into its favorite
3869 * format (maybe we should add a `fontoffset' field to the `display'
3870 * structure so we won't have to convert the fontdata all the time.
3874 #define max_font_size 65536
3876 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3878 struct console_font font;
3882 if (vc->vc_mode != KD_TEXT)
3886 font.data = kmalloc(max_font_size, GFP_KERNEL);
3892 acquire_console_sem();
3893 if (vc->vc_sw->con_font_get)
3894 rc = vc->vc_sw->con_font_get(vc, &font);
3897 release_console_sem();
3902 c = (font.width+7)/8 * 32 * font.charcount;
3904 if (op->data && font.charcount > op->charcount)
3906 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3907 if (font.width > op->width || font.height > op->height)
3910 if (font.width != 8)
3912 else if ((op->height && font.height > op->height) ||
3919 op->height = font.height;
3920 op->width = font.width;
3921 op->charcount = font.charcount;
3923 if (op->data && copy_to_user(op->data, font.data, c))
3931 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3933 struct console_font font;
3937 if (vc->vc_mode != KD_TEXT)
3941 if (op->charcount > 512)
3943 if (!op->height) { /* Need to guess font height [compat] */
3945 u8 __user *charmap = op->data;
3948 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3949 so that we can get rid of this soon */
3950 if (!(op->flags & KD_FONT_FLAG_OLD))
3952 for (h = 32; h > 0; h--)
3953 for (i = 0; i < op->charcount; i++) {
3954 if (get_user(tmp, &charmap[32*i+h-1]))
3963 if (op->width <= 0 || op->width > 32 || op->height > 32)
3965 size = (op->width+7)/8 * 32 * op->charcount;
3966 if (size > max_font_size)
3968 font.charcount = op->charcount;
3969 font.height = op->height;
3970 font.width = op->width;
3971 font.data = kmalloc(size, GFP_KERNEL);
3974 if (copy_from_user(font.data, op->data, size)) {
3978 acquire_console_sem();
3979 if (vc->vc_sw->con_font_set)
3980 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3983 release_console_sem();
3988 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3990 struct console_font font = {.width = op->width, .height = op->height};
3991 char name[MAX_FONT_NAME];
3995 if (vc->vc_mode != KD_TEXT)
4000 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4003 name[MAX_FONT_NAME - 1] = 0;
4005 acquire_console_sem();
4006 if (vc->vc_sw->con_font_default)
4007 rc = vc->vc_sw->con_font_default(vc, &font, s);
4010 release_console_sem();
4012 op->width = font.width;
4013 op->height = font.height;
4018 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4020 int con = op->height;
4023 if (vc->vc_mode != KD_TEXT)
4026 acquire_console_sem();
4027 if (!vc->vc_sw->con_font_copy)
4029 else if (con < 0 || !vc_cons_allocated(con))
4031 else if (con == vc->vc_num) /* nothing to do */
4034 rc = vc->vc_sw->con_font_copy(vc, con);
4035 release_console_sem();
4039 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4042 case KD_FONT_OP_SET:
4043 return con_font_set(vc, op);
4044 case KD_FONT_OP_GET:
4045 return con_font_get(vc, op);
4046 case KD_FONT_OP_SET_DEFAULT:
4047 return con_font_default(vc, op);
4048 case KD_FONT_OP_COPY:
4049 return con_font_copy(vc, op);
4055 * Interface exported to selection and vcs.
4058 /* used by selection */
4059 u16 screen_glyph(struct vc_data *vc, int offset)
4061 u16 w = scr_readw(screenpos(vc, offset, 1));
4064 if (w & vc->vc_hi_font_mask)
4068 EXPORT_SYMBOL_GPL(screen_glyph);
4070 /* used by vcs - note the word offset */
4071 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4073 return screenpos(vc, 2 * w_offset, viewed);
4076 void getconsxy(struct vc_data *vc, unsigned char *p)
4082 void putconsxy(struct vc_data *vc, unsigned char *p)
4085 gotoxy(vc, p[0], p[1]);
4089 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4091 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4092 return softcursor_original;
4093 return scr_readw(org);
4096 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4098 scr_writew(val, org);
4099 if ((unsigned long)org == vc->vc_pos) {
4100 softcursor_original = -1;
4106 * Visible symbols for modules
4109 EXPORT_SYMBOL(color_table);
4110 EXPORT_SYMBOL(default_red);
4111 EXPORT_SYMBOL(default_grn);
4112 EXPORT_SYMBOL(default_blu);
4113 EXPORT_SYMBOL(update_region);
4114 EXPORT_SYMBOL(redraw_screen);
4115 EXPORT_SYMBOL(vc_resize);
4116 EXPORT_SYMBOL(fg_console);
4117 EXPORT_SYMBOL(console_blank_hook);
4118 EXPORT_SYMBOL(console_blanked);
4119 EXPORT_SYMBOL(vc_cons);
4120 EXPORT_SYMBOL(global_cursor_default);
4121 #ifndef VT_SINGLE_DRIVER
4122 EXPORT_SYMBOL(take_over_console);
4123 EXPORT_SYMBOL(give_up_console);