2 * Copyright (C) 1991, 1992 Linus Torvalds
6 * Hopefully this will be a rather complete VT102 implementation.
8 * Beeping thanks to John T Kohl.
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
36 * Original m68k console driver modifications by
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 * Removed old-style timers, introduced console_timer, made timer
60 * deletion SMP-safe. 17Jun00, Andrew Morton
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73 #include <linux/module.h>
74 #include <linux/types.h>
75 #include <linux/sched.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/kernel.h>
79 #include <linux/string.h>
80 #include <linux/errno.h>
82 #include <linux/slab.h>
83 #include <linux/major.h>
85 #include <linux/console.h>
86 #include <linux/init.h>
87 #include <linux/mutex.h>
88 #include <linux/vt_kern.h>
89 #include <linux/selection.h>
90 #include <linux/tiocl.h>
91 #include <linux/kbd_kern.h>
92 #include <linux/consolemap.h>
93 #include <linux/timer.h>
94 #include <linux/interrupt.h>
95 #include <linux/workqueue.h>
97 #include <linux/font.h>
98 #include <linux/bitops.h>
99 #include <linux/notifier.h>
100 #include <linux/device.h>
101 #include <linux/io.h>
102 #include <linux/uaccess.h>
103 #include <linux/kdb.h>
104 #include <linux/ctype.h>
106 #define MAX_NR_CON_DRIVER 16
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT 2
110 #define CON_DRIVER_FLAG_ATTR 4
111 #define CON_DRIVER_FLAG_ZOMBIE 8
114 const struct consw *con;
123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
124 const struct consw *conswitchp;
126 /* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
131 #define CTRL_ACTION 0x0d00ff81
132 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 #define DEFAULT_BELL_PITCH 750
138 #define DEFAULT_BELL_DURATION (HZ/8)
139 #define DEFAULT_CURSOR_BLINK_MS 200
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 con_driver_unregister_callback(struct work_struct *ignored);
159 static void blank_screen_t(unsigned long dummy);
160 static void set_palette(struct vc_data *vc);
162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
164 static int printable; /* Is console ready for printing? */
165 int default_utf8 = true;
166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
167 int global_cursor_default = -1;
168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
170 static int cur_default = CUR_DEFAULT;
171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
174 * ignore_poke: don't unblank the screen when things are typed. This is
175 * mainly for the privacy of braille terminal users.
177 static int ignore_poke;
179 int do_poke_blanked_console;
182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
183 static int vesa_off_interval;
184 static int blankinterval = 10*60;
185 core_param(consoleblank, blankinterval, int, 0444);
187 static DECLARE_WORK(console_work, console_callback);
188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
191 * fg_console is the current virtual console,
192 * last_console is the last used one,
193 * want_console is the console we want to switch to,
194 * saved_* variants are for save/restore around kernel debugger enter/leave
198 int want_console = -1;
199 static int saved_fg_console;
200 static int saved_last_console;
201 static int saved_want_console;
202 static int saved_vc_mode;
203 static int saved_console_blanked;
206 * For each existing display, we have a pointer to console currently visible
207 * on that display, allowing consoles other than fg_console to be refreshed
208 * appropriately. Unless the low-level driver supplies its own display_fg
209 * variable, we use this one for the "master display".
211 static struct vc_data *master_display_fg;
214 * Unfortunately, we need to delay tty echo when we're currently writing to the
215 * console since the code is (and always was) not re-entrant, so we schedule
216 * all flip requests to process context with schedule-task() and run it from
217 * console_callback().
221 * For the same reason, we defer scrollback to the console callback.
223 static int scrollback_delta;
226 * Hook so that the power management routines can (un)blank
227 * the console on our behalf.
229 int (*console_blank_hook)(int);
231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
232 static int blank_state;
233 static int blank_timer_expired;
241 * /sys/class/tty/tty0/
243 * the attribute 'active' contains the name of the current vc
244 * console and it supports poll() to detect vc switches
246 static struct device *tty0dev;
249 * Notifier list for console events.
251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
253 int register_vt_notifier(struct notifier_block *nb)
255 return atomic_notifier_chain_register(&vt_notifier_list, nb);
257 EXPORT_SYMBOL_GPL(register_vt_notifier);
259 int unregister_vt_notifier(struct notifier_block *nb)
261 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
265 static void notify_write(struct vc_data *vc, unsigned int unicode)
267 struct vt_notifier_param param = { .vc = vc, .c = unicode };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
271 static void notify_update(struct vc_data *vc)
273 struct vt_notifier_param param = { .vc = vc };
274 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
277 * Low-Level Functions
280 #define IS_FG(vc) ((vc)->vc_num == fg_console)
282 #ifdef VT_BUF_VRAM_ONLY
283 #define DO_UPDATE(vc) 0
285 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
288 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
293 p = (unsigned short *)(vc->vc_origin + offset);
294 else if (!vc->vc_sw->con_screen_pos)
295 p = (unsigned short *)(vc->vc_visible_origin + offset);
297 p = vc->vc_sw->con_screen_pos(vc, offset);
301 /* Called from the keyboard irq path.. */
302 static inline void scrolldelta(int lines)
305 /* scrolldelta needs some kind of consistency lock, but the BKL was
306 and still is not protecting versus the scheduled back end */
307 scrollback_delta += lines;
308 schedule_console_callback();
311 void schedule_console_callback(void)
313 schedule_work(&console_work);
316 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
318 unsigned short *d, *s;
322 if (b > vc->vc_rows || t >= b || nr < 1)
324 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
326 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
327 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
328 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
329 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
330 vc->vc_size_row * nr);
333 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
340 if (b > vc->vc_rows || t >= b || nr < 1)
342 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
344 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
345 step = vc->vc_cols * nr;
346 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
347 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
350 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
352 #ifndef VT_BUF_VRAM_ONLY
353 unsigned int xx, yy, offset;
357 if (!vc->vc_sw->con_getxy) {
358 offset = (start - vc->vc_origin) / 2;
359 xx = offset % vc->vc_cols;
360 yy = offset / vc->vc_cols;
363 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
367 u16 attrib = scr_readw(p) & 0xff00;
370 while (xx < vc->vc_cols && count) {
371 if (attrib != (scr_readw(p) & 0xff00)) {
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
376 attrib = scr_readw(p) & 0xff00;
383 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
388 if (vc->vc_sw->con_getxy) {
390 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
396 void update_region(struct vc_data *vc, unsigned long start, int count)
398 WARN_CONSOLE_UNLOCKED();
402 do_update_region(vc, start, count);
407 /* Structure of attributes is hardware-dependent */
409 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
410 u8 _underline, u8 _reverse, u8 _italic)
412 if (vc->vc_sw->con_build_attr)
413 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
414 _blink, _underline, _reverse, _italic);
416 #ifndef VT_BUF_VRAM_ONLY
418 * ++roman: I completely changed the attribute format for monochrome
419 * mode (!can_do_color). The formerly used MDA (monochrome display
420 * adapter) format didn't allow the combination of certain effects.
421 * Now the attribute is just a bit vector:
422 * Bit 0..1: intensity (0..2)
429 if (!vc->vc_can_do_color)
432 (_underline ? 4 : 0) |
436 a = (a & 0xF0) | vc->vc_itcolor;
438 a = (a & 0xf0) | vc->vc_ulcolor;
439 else if (_intensity == 0)
440 a = (a & 0xf0) | vc->vc_ulcolor;
442 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
447 if (vc->vc_hi_font_mask == 0x100)
456 static void update_attr(struct vc_data *vc)
458 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
459 vc->vc_blink, vc->vc_underline,
460 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
461 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
464 /* Note: inverting the screen twice should revert to the original state */
465 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
469 WARN_CONSOLE_UNLOCKED();
472 p = screenpos(vc, offset, viewed);
473 if (vc->vc_sw->con_invert_region)
474 vc->vc_sw->con_invert_region(vc, p, count);
475 #ifndef VT_BUF_VRAM_ONLY
481 if (!vc->vc_can_do_color) {
488 } else if (vc->vc_hi_font_mask == 0x100) {
491 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
498 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
506 do_update_region(vc, (unsigned long) p, count);
510 /* used by selection: complement pointer position */
511 void complement_pos(struct vc_data *vc, int offset)
513 static int old_offset = -1;
514 static unsigned short old;
515 static unsigned short oldx, oldy;
517 WARN_CONSOLE_UNLOCKED();
519 if (old_offset != -1 && old_offset >= 0 &&
520 old_offset < vc->vc_screenbuf_size) {
521 scr_writew(old, screenpos(vc, old_offset, 1));
523 vc->vc_sw->con_putc(vc, old, oldy, oldx);
529 if (offset != -1 && offset >= 0 &&
530 offset < vc->vc_screenbuf_size) {
533 p = screenpos(vc, offset, 1);
535 new = old ^ vc->vc_complement_mask;
538 oldx = (offset >> 1) % vc->vc_cols;
539 oldy = (offset >> 1) / vc->vc_cols;
540 vc->vc_sw->con_putc(vc, new, oldy, oldx);
546 static void insert_char(struct vc_data *vc, unsigned int nr)
548 unsigned short *p = (unsigned short *) vc->vc_pos;
550 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
551 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
552 vc->vc_need_wrap = 0;
554 do_update_region(vc, (unsigned long) p,
555 vc->vc_cols - vc->vc_x);
558 static void delete_char(struct vc_data *vc, unsigned int nr)
560 unsigned short *p = (unsigned short *) vc->vc_pos;
562 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
563 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
565 vc->vc_need_wrap = 0;
567 do_update_region(vc, (unsigned long) p,
568 vc->vc_cols - vc->vc_x);
571 static int softcursor_original;
573 static void add_softcursor(struct vc_data *vc)
575 int i = scr_readw((u16 *) vc->vc_pos);
576 u32 type = vc->vc_cursor_type;
578 if (! (type & 0x10)) return;
579 if (softcursor_original != -1) return;
580 softcursor_original = i;
581 i |= ((type >> 8) & 0xff00 );
582 i ^= ((type) & 0xff00 );
583 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
584 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
585 scr_writew(i, (u16 *) vc->vc_pos);
587 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
590 static void hide_softcursor(struct vc_data *vc)
592 if (softcursor_original != -1) {
593 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
595 vc->vc_sw->con_putc(vc, softcursor_original,
597 softcursor_original = -1;
601 static void hide_cursor(struct vc_data *vc)
605 vc->vc_sw->con_cursor(vc, CM_ERASE);
609 static void set_cursor(struct vc_data *vc)
611 if (!IS_FG(vc) || console_blanked ||
612 vc->vc_mode == KD_GRAPHICS)
618 if ((vc->vc_cursor_type & 0x0f) != 1)
619 vc->vc_sw->con_cursor(vc, CM_DRAW);
624 static void set_origin(struct vc_data *vc)
626 WARN_CONSOLE_UNLOCKED();
628 if (!CON_IS_VISIBLE(vc) ||
629 !vc->vc_sw->con_set_origin ||
630 !vc->vc_sw->con_set_origin(vc))
631 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
632 vc->vc_visible_origin = vc->vc_origin;
633 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
634 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
637 static inline void save_screen(struct vc_data *vc)
639 WARN_CONSOLE_UNLOCKED();
641 if (vc->vc_sw->con_save_screen)
642 vc->vc_sw->con_save_screen(vc);
646 * Redrawing of screen
649 void clear_buffer_attributes(struct vc_data *vc)
651 unsigned short *p = (unsigned short *)vc->vc_origin;
652 int count = vc->vc_screenbuf_size / 2;
653 int mask = vc->vc_hi_font_mask | 0xff;
655 for (; count > 0; count--, p++) {
656 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
660 void redraw_screen(struct vc_data *vc, int is_switch)
664 WARN_CONSOLE_UNLOCKED();
668 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
673 struct vc_data *old_vc = vc_cons[fg_console].d;
676 if (!CON_IS_VISIBLE(vc))
678 *vc->vc_display_fg = vc;
679 fg_console = vc->vc_num;
681 if (!CON_IS_VISIBLE(old_vc)) {
686 sysfs_notify(&tty0dev->kobj, NULL, "active");
694 int old_was_color = vc->vc_can_do_color;
697 update = vc->vc_sw->con_switch(vc);
700 * If console changed from mono<->color, the best we can do
701 * is to clear the buffer attributes. As it currently stands,
702 * rebuilding new attributes from the old buffer is not doable
703 * without overly complex code.
705 if (old_was_color != vc->vc_can_do_color) {
707 clear_buffer_attributes(vc);
710 /* Forcibly update if we're panicing */
711 if ((update && vc->vc_mode != KD_GRAPHICS) ||
712 vt_force_oops_output(vc))
713 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
718 compute_shiftstate();
724 * Allocation, freeing and resizing of VTs.
727 int vc_cons_allocated(unsigned int i)
729 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
732 static void visual_init(struct vc_data *vc, int num, int init)
734 /* ++Geert: vc->vc_sw->con_init determines console size */
736 module_put(vc->vc_sw->owner);
737 vc->vc_sw = conswitchp;
738 #ifndef VT_SINGLE_DRIVER
739 if (con_driver_map[num])
740 vc->vc_sw = con_driver_map[num];
742 __module_get(vc->vc_sw->owner);
744 vc->vc_display_fg = &master_display_fg;
745 if (vc->vc_uni_pagedir_loc)
747 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
748 vc->vc_uni_pagedir = NULL;
749 vc->vc_hi_font_mask = 0;
750 vc->vc_complement_mask = 0;
751 vc->vc_can_do_color = 0;
752 vc->vc_panic_force_write = false;
753 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
754 vc->vc_sw->con_init(vc, init);
755 if (!vc->vc_complement_mask)
756 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
757 vc->vc_s_complement_mask = vc->vc_complement_mask;
758 vc->vc_size_row = vc->vc_cols << 1;
759 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
762 int vc_allocate(unsigned int currcons) /* return 0 on success */
764 WARN_CONSOLE_UNLOCKED();
766 if (currcons >= MAX_NR_CONSOLES)
768 if (!vc_cons[currcons].d) {
770 struct vt_notifier_param param;
772 /* prevent users from taking too much memory */
773 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
776 /* due to the granularity of kmalloc, we waste some memory here */
777 /* the alloc is done in two steps, to optimize the common situation
778 of a 25x80 console (structsize=216, screenbuf_size=4000) */
779 /* although the numbers above are not valid since long ago, the
780 point is still up-to-date and the comment still has its value
781 even if only as a historical artifact. --mj, July 1998 */
782 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
785 vc_cons[currcons].d = vc;
786 tty_port_init(&vc->port);
787 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
788 visual_init(vc, currcons, 1);
789 if (!*vc->vc_uni_pagedir_loc)
790 con_set_default_unimap(vc);
791 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
792 if (!vc->vc_screenbuf) {
794 vc_cons[currcons].d = NULL;
798 /* If no drivers have overridden us and the user didn't pass a
799 boot option, default to displaying the cursor */
800 if (global_cursor_default == -1)
801 global_cursor_default = 1;
803 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
804 vcs_make_sysfs(currcons);
805 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
810 static inline int resize_screen(struct vc_data *vc, int width, int height,
813 /* Resizes the resolution of the display adapater */
816 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
817 err = vc->vc_sw->con_resize(vc, width, height, user);
823 * Change # of rows and columns (0 means unchanged/the size of fg_console)
824 * [this is to be used together with some user program
825 * like resize that changes the hardware videomode]
827 #define VC_RESIZE_MAXCOL (32767)
828 #define VC_RESIZE_MAXROW (32767)
831 * vc_do_resize - resizing method for the tty
832 * @tty: tty being resized
833 * @real_tty: real tty (different to tty if a pty/tty pair)
834 * @vc: virtual console private data
838 * Resize a virtual console, clipping according to the actual constraints.
839 * If the caller passes a tty structure then update the termios winsize
840 * information and perform any necessary signal handling.
842 * Caller must hold the console semaphore. Takes the termios rwsem and
843 * ctrl_lock of the tty IFF a tty is passed.
846 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
847 unsigned int cols, unsigned int lines)
849 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
851 unsigned int old_rows, old_row_size;
852 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
854 unsigned short *newscreen;
856 WARN_CONSOLE_UNLOCKED();
861 user = vc->vc_resize_user;
862 vc->vc_resize_user = 0;
864 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
867 new_cols = (cols ? cols : vc->vc_cols);
868 new_rows = (lines ? lines : vc->vc_rows);
869 new_row_size = new_cols << 1;
870 new_screen_size = new_row_size * new_rows;
872 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
875 if (new_screen_size > (4 << 20))
877 newscreen = kmalloc(new_screen_size, GFP_USER);
884 old_rows = vc->vc_rows;
885 old_row_size = vc->vc_size_row;
887 err = resize_screen(vc, new_cols, new_rows, user);
893 vc->vc_rows = new_rows;
894 vc->vc_cols = new_cols;
895 vc->vc_size_row = new_row_size;
896 vc->vc_screenbuf_size = new_screen_size;
898 rlth = min(old_row_size, new_row_size);
899 rrem = new_row_size - rlth;
900 old_origin = vc->vc_origin;
901 new_origin = (long) newscreen;
902 new_scr_end = new_origin + new_screen_size;
904 if (vc->vc_y > new_rows) {
905 if (old_rows - vc->vc_y < new_rows) {
907 * Cursor near the bottom, copy contents from the
910 old_origin += (old_rows - new_rows) * old_row_size;
913 * Cursor is in no man's land, copy 1/2 screenful
914 * from the top and bottom of cursor position
916 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
920 end = old_origin + old_row_size * min(old_rows, new_rows);
924 while (old_origin < end) {
925 scr_memcpyw((unsigned short *) new_origin,
926 (unsigned short *) old_origin, rlth);
928 scr_memsetw((void *)(new_origin + rlth),
929 vc->vc_video_erase_char, rrem);
930 old_origin += old_row_size;
931 new_origin += new_row_size;
933 if (new_scr_end > new_origin)
934 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
935 new_scr_end - new_origin);
936 kfree(vc->vc_screenbuf);
937 vc->vc_screenbuf = newscreen;
938 vc->vc_screenbuf_size = new_screen_size;
941 /* do part of a reset_terminal() */
943 vc->vc_bottom = vc->vc_rows;
944 gotoxy(vc, vc->vc_x, vc->vc_y);
948 /* Rewrite the requested winsize data with the actual
951 memset(&ws, 0, sizeof(ws));
952 ws.ws_row = vc->vc_rows;
953 ws.ws_col = vc->vc_cols;
954 ws.ws_ypixel = vc->vc_scan_lines;
955 tty_do_resize(tty, &ws);
958 if (CON_IS_VISIBLE(vc))
960 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
965 * vc_resize - resize a VT
966 * @vc: virtual console
970 * Resize a virtual console as seen from the console end of things. We
971 * use the common vc_do_resize methods to update the structures. The
972 * caller must hold the console sem to protect console internals and
976 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
978 return vc_do_resize(vc->port.tty, vc, cols, rows);
982 * vt_resize - resize a VT
983 * @tty: tty to resize
984 * @ws: winsize attributes
986 * Resize a virtual terminal. This is called by the tty layer as we
987 * register our own handler for resizing. The mutual helper does all
990 * Takes the console sem and the called methods then take the tty
991 * termios_rwsem and the tty ctrl_lock in that order.
993 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
995 struct vc_data *vc = tty->driver_data;
999 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1004 struct vc_data *vc_deallocate(unsigned int currcons)
1006 struct vc_data *vc = NULL;
1008 WARN_CONSOLE_UNLOCKED();
1010 if (vc_cons_allocated(currcons)) {
1011 struct vt_notifier_param param;
1013 param.vc = vc = vc_cons[currcons].d;
1014 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1015 vcs_remove_sysfs(currcons);
1016 vc->vc_sw->con_deinit(vc);
1017 put_pid(vc->vt_pid);
1018 module_put(vc->vc_sw->owner);
1019 kfree(vc->vc_screenbuf);
1020 vc_cons[currcons].d = NULL;
1029 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1030 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1031 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1033 #define decarm VC_REPEAT
1034 #define decckm VC_CKMODE
1035 #define kbdapplic VC_APPLIC
1039 * this is what the terminal answers to a ESC-Z or csi0c query.
1041 #define VT100ID "\033[?1;2c"
1042 #define VT102ID "\033[?6c"
1044 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1045 8,12,10,14, 9,13,11,15 };
1047 /* the default colour table, for VGA+ colour systems */
1048 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1049 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1050 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1051 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1052 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1053 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1055 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1056 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1057 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1060 * gotoxy() must verify all boundaries, because the arguments
1061 * might also be negative. If the given position is out of
1062 * bounds, the cursor is placed at the nearest margin.
1064 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1071 if (new_x >= vc->vc_cols)
1072 vc->vc_x = vc->vc_cols - 1;
1079 max_y = vc->vc_bottom;
1082 max_y = vc->vc_rows;
1086 else if (new_y >= max_y)
1087 vc->vc_y = max_y - 1;
1090 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1091 vc->vc_need_wrap = 0;
1094 /* for absolute user moves, when decom is set */
1095 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1097 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1100 void scrollback(struct vc_data *vc, int lines)
1103 lines = vc->vc_rows / 2;
1104 scrolldelta(-lines);
1107 void scrollfront(struct vc_data *vc, int lines)
1110 lines = vc->vc_rows / 2;
1114 static void lf(struct vc_data *vc)
1116 /* don't scroll if above bottom of scrolling region, or
1117 * if below scrolling region
1119 if (vc->vc_y + 1 == vc->vc_bottom)
1120 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1121 else if (vc->vc_y < vc->vc_rows - 1) {
1123 vc->vc_pos += vc->vc_size_row;
1125 vc->vc_need_wrap = 0;
1126 notify_write(vc, '\n');
1129 static void ri(struct vc_data *vc)
1131 /* don't scroll if below top of scrolling region, or
1132 * if above scrolling region
1134 if (vc->vc_y == vc->vc_top)
1135 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1136 else if (vc->vc_y > 0) {
1138 vc->vc_pos -= vc->vc_size_row;
1140 vc->vc_need_wrap = 0;
1143 static inline void cr(struct vc_data *vc)
1145 vc->vc_pos -= vc->vc_x << 1;
1146 vc->vc_need_wrap = vc->vc_x = 0;
1147 notify_write(vc, '\r');
1150 static inline void bs(struct vc_data *vc)
1155 vc->vc_need_wrap = 0;
1156 notify_write(vc, '\b');
1160 static inline void del(struct vc_data *vc)
1165 static void csi_J(struct vc_data *vc, int vpar)
1168 unsigned short * start;
1171 case 0: /* erase from cursor to end of display */
1172 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1173 start = (unsigned short *)vc->vc_pos;
1175 case 1: /* erase from start to cursor */
1176 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1177 start = (unsigned short *)vc->vc_origin;
1179 case 3: /* erase scroll-back buffer (and whole display) */
1180 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1181 vc->vc_screenbuf_size);
1183 if (CON_IS_VISIBLE(vc))
1186 case 2: /* erase whole display */
1187 count = vc->vc_cols * vc->vc_rows;
1188 start = (unsigned short *)vc->vc_origin;
1193 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1195 do_update_region(vc, (unsigned long) start, count);
1196 vc->vc_need_wrap = 0;
1199 static void csi_K(struct vc_data *vc, int vpar)
1202 unsigned short * start;
1205 case 0: /* erase from cursor to end of line */
1206 count = vc->vc_cols - vc->vc_x;
1207 start = (unsigned short *)vc->vc_pos;
1209 case 1: /* erase from start of line to cursor */
1210 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1211 count = vc->vc_x + 1;
1213 case 2: /* erase whole line */
1214 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1215 count = vc->vc_cols;
1220 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1221 vc->vc_need_wrap = 0;
1223 do_update_region(vc, (unsigned long) start, count);
1226 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1232 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1234 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1236 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1237 vc->vc_need_wrap = 0;
1240 static void default_attr(struct vc_data *vc)
1242 vc->vc_intensity = 1;
1244 vc->vc_underline = 0;
1247 vc->vc_color = vc->vc_def_color;
1250 struct rgb { u8 r; u8 g; u8 b; };
1252 static struct rgb rgb_from_256(int i)
1255 if (i < 8) { /* Standard colours. */
1256 c.r = i&1 ? 0xaa : 0x00;
1257 c.g = i&2 ? 0xaa : 0x00;
1258 c.b = i&4 ? 0xaa : 0x00;
1259 } else if (i < 16) {
1260 c.r = i&1 ? 0xff : 0x55;
1261 c.g = i&2 ? 0xff : 0x55;
1262 c.b = i&4 ? 0xff : 0x55;
1263 } else if (i < 232) { /* 6x6x6 colour cube. */
1264 c.r = (i - 16) / 36 * 85 / 2;
1265 c.g = (i - 16) / 6 % 6 * 85 / 2;
1266 c.b = (i - 16) % 6 * 85 / 2;
1267 } else /* Grayscale ramp. */
1268 c.r = c.g = c.b = i * 10 - 2312;
1272 static void rgb_foreground(struct vc_data *vc, struct rgb c)
1279 hue = (c.r > max/2 ? 4 : 0)
1280 | (c.g > max/2 ? 2 : 0)
1281 | (c.b > max/2 ? 1 : 0);
1282 if (hue == 7 && max <= 0x55)
1283 hue = 0, vc->vc_intensity = 2;
1285 vc->vc_intensity = (max > 0xaa) + 1;
1286 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1289 static void rgb_background(struct vc_data *vc, struct rgb c)
1291 /* For backgrounds, err on the dark side. */
1292 vc->vc_color = (vc->vc_color & 0x0f)
1293 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1296 /* console_lock is held */
1297 static void csi_m(struct vc_data *vc)
1301 for (i = 0; i <= vc->vc_npar; i++)
1302 switch (vc->vc_par[i]) {
1303 case 0: /* all attributes off */
1307 vc->vc_intensity = 2;
1310 vc->vc_intensity = 0;
1316 vc->vc_underline = 1;
1324 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1325 * Select primary font, don't display
1326 * control chars if defined, don't set
1329 vc->vc_translate = set_translate(vc->vc_charset == 0
1331 : vc->vc_G1_charset, vc);
1332 vc->vc_disp_ctrl = 0;
1333 vc->vc_toggle_meta = 0;
1335 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1336 * Select first alternate font, lets
1337 * chars < 32 be displayed as ROM chars.
1339 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1340 vc->vc_disp_ctrl = 1;
1341 vc->vc_toggle_meta = 0;
1343 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1344 * Select second alternate font, toggle
1345 * high bit before displaying as ROM char.
1347 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1348 vc->vc_disp_ctrl = 1;
1349 vc->vc_toggle_meta = 1;
1353 vc->vc_intensity = 1;
1359 vc->vc_underline = 0;
1367 case 38: /* ITU T.416
1368 * Higher colour modes.
1369 * They break the usual properties of SGR codes
1370 * and thus need to be detected and ignored by
1371 * hand. Strictly speaking, that standard also
1372 * wants : rather than ; as separators, contrary
1373 * to ECMA-48, but no one produces such codes
1374 * and almost no one accepts them.
1377 if (i > vc->vc_npar)
1379 if (vc->vc_par[i] == 5 && /* 256 colours */
1380 i < vc->vc_npar) { /* ubiquitous */
1383 rgb_from_256(vc->vc_par[i]));
1384 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1385 i <= vc->vc_npar + 3) {/* extremely rare */
1387 .r = vc->vc_par[i + 1],
1388 .g = vc->vc_par[i + 2],
1389 .b = vc->vc_par[i + 3],
1391 rgb_foreground(vc, c);
1394 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1395 * there's no point in supporting them.
1400 if (i > vc->vc_npar)
1402 if (vc->vc_par[i] == 5 && /* 256 colours */
1406 rgb_from_256(vc->vc_par[i]));
1407 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1408 i <= vc->vc_npar + 3) {
1410 .r = vc->vc_par[i + 1],
1411 .g = vc->vc_par[i + 2],
1412 .b = vc->vc_par[i + 3],
1414 rgb_background(vc, c);
1419 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1422 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1425 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1426 vc->vc_color = color_table[vc->vc_par[i] - 30]
1427 | (vc->vc_color & 0xf0);
1428 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1429 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1430 | (vc->vc_color & 0x0f);
1436 static void respond_string(const char *p, struct tty_port *port)
1439 tty_insert_flip_char(port, *p, 0);
1442 tty_schedule_flip(port);
1445 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1449 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1450 respond_string(buf, tty->port);
1453 static inline void status_report(struct tty_struct *tty)
1455 respond_string("\033[0n", tty->port); /* Terminal ok */
1458 static inline void respond_ID(struct tty_struct *tty)
1460 respond_string(VT102ID, tty->port);
1463 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1467 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1469 respond_string(buf, tty->port);
1472 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1473 int mouse_reporting(void)
1475 return vc_cons[fg_console].d->vc_report_mouse;
1478 /* console_lock is held */
1479 static void set_mode(struct vc_data *vc, int on_off)
1483 for (i = 0; i <= vc->vc_npar; i++)
1485 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1486 case 1: /* Cursor keys send ^[Ox/^[[x */
1488 set_kbd(vc, decckm);
1490 clr_kbd(vc, decckm);
1492 case 3: /* 80/132 mode switch unimplemented */
1493 vc->vc_deccolm = on_off;
1495 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1496 /* this alone does not suffice; some user mode
1497 utility has to change the hardware regs */
1500 case 5: /* Inverted screen on/off */
1501 if (vc->vc_decscnm != on_off) {
1502 vc->vc_decscnm = on_off;
1503 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1507 case 6: /* Origin relative/absolute */
1508 vc->vc_decom = on_off;
1511 case 7: /* Autowrap on/off */
1512 vc->vc_decawm = on_off;
1514 case 8: /* Autorepeat on/off */
1516 set_kbd(vc, decarm);
1518 clr_kbd(vc, decarm);
1521 vc->vc_report_mouse = on_off ? 1 : 0;
1523 case 25: /* Cursor on/off */
1524 vc->vc_deccm = on_off;
1527 vc->vc_report_mouse = on_off ? 2 : 0;
1531 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1532 case 3: /* Monitor (display ctrls) */
1533 vc->vc_disp_ctrl = on_off;
1535 case 4: /* Insert Mode on/off */
1536 vc->vc_decim = on_off;
1538 case 20: /* Lf, Enter == CrLf/Lf */
1548 /* console_lock is held */
1549 static void setterm_command(struct vc_data *vc)
1551 switch(vc->vc_par[0]) {
1552 case 1: /* set color for underline mode */
1553 if (vc->vc_can_do_color &&
1554 vc->vc_par[1] < 16) {
1555 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1556 if (vc->vc_underline)
1560 case 2: /* set color for half intensity mode */
1561 if (vc->vc_can_do_color &&
1562 vc->vc_par[1] < 16) {
1563 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1564 if (vc->vc_intensity == 0)
1568 case 8: /* store colors as defaults */
1569 vc->vc_def_color = vc->vc_attr;
1570 if (vc->vc_hi_font_mask == 0x100)
1571 vc->vc_def_color >>= 1;
1575 case 9: /* set blanking interval */
1576 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1577 poke_blanked_console();
1579 case 10: /* set bell frequency in Hz */
1580 if (vc->vc_npar >= 1)
1581 vc->vc_bell_pitch = vc->vc_par[1];
1583 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1585 case 11: /* set bell duration in msec */
1586 if (vc->vc_npar >= 1)
1587 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1588 msecs_to_jiffies(vc->vc_par[1]) : 0;
1590 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1592 case 12: /* bring specified console to the front */
1593 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1594 set_console(vc->vc_par[1] - 1);
1596 case 13: /* unblank the screen */
1597 poke_blanked_console();
1599 case 14: /* set vesa powerdown interval */
1600 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1602 case 15: /* activate the previous console */
1603 set_console(last_console);
1605 case 16: /* set cursor blink duration in msec */
1606 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1607 vc->vc_par[1] <= USHRT_MAX)
1608 vc->vc_cur_blink_ms = vc->vc_par[1];
1610 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1615 /* console_lock is held */
1616 static void csi_at(struct vc_data *vc, unsigned int nr)
1618 if (nr > vc->vc_cols - vc->vc_x)
1619 nr = vc->vc_cols - vc->vc_x;
1622 insert_char(vc, nr);
1625 /* console_lock is held */
1626 static void csi_L(struct vc_data *vc, unsigned int nr)
1628 if (nr > vc->vc_rows - vc->vc_y)
1629 nr = vc->vc_rows - vc->vc_y;
1632 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1633 vc->vc_need_wrap = 0;
1636 /* console_lock is held */
1637 static void csi_P(struct vc_data *vc, unsigned int nr)
1639 if (nr > vc->vc_cols - vc->vc_x)
1640 nr = vc->vc_cols - vc->vc_x;
1643 delete_char(vc, nr);
1646 /* console_lock is held */
1647 static void csi_M(struct vc_data *vc, unsigned int nr)
1649 if (nr > vc->vc_rows - vc->vc_y)
1650 nr = vc->vc_rows - vc->vc_y;
1653 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1654 vc->vc_need_wrap = 0;
1657 /* console_lock is held (except via vc_init->reset_terminal */
1658 static void save_cur(struct vc_data *vc)
1660 vc->vc_saved_x = vc->vc_x;
1661 vc->vc_saved_y = vc->vc_y;
1662 vc->vc_s_intensity = vc->vc_intensity;
1663 vc->vc_s_italic = vc->vc_italic;
1664 vc->vc_s_underline = vc->vc_underline;
1665 vc->vc_s_blink = vc->vc_blink;
1666 vc->vc_s_reverse = vc->vc_reverse;
1667 vc->vc_s_charset = vc->vc_charset;
1668 vc->vc_s_color = vc->vc_color;
1669 vc->vc_saved_G0 = vc->vc_G0_charset;
1670 vc->vc_saved_G1 = vc->vc_G1_charset;
1673 /* console_lock is held */
1674 static void restore_cur(struct vc_data *vc)
1676 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1677 vc->vc_intensity = vc->vc_s_intensity;
1678 vc->vc_italic = vc->vc_s_italic;
1679 vc->vc_underline = vc->vc_s_underline;
1680 vc->vc_blink = vc->vc_s_blink;
1681 vc->vc_reverse = vc->vc_s_reverse;
1682 vc->vc_charset = vc->vc_s_charset;
1683 vc->vc_color = vc->vc_s_color;
1684 vc->vc_G0_charset = vc->vc_saved_G0;
1685 vc->vc_G1_charset = vc->vc_saved_G1;
1686 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1688 vc->vc_need_wrap = 0;
1691 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1692 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1695 /* console_lock is held (except via vc_init()) */
1696 static void reset_terminal(struct vc_data *vc, int do_clear)
1699 vc->vc_bottom = vc->vc_rows;
1700 vc->vc_state = ESnormal;
1702 vc->vc_translate = set_translate(LAT1_MAP, vc);
1703 vc->vc_G0_charset = LAT1_MAP;
1704 vc->vc_G1_charset = GRAF_MAP;
1706 vc->vc_need_wrap = 0;
1707 vc->vc_report_mouse = 0;
1708 vc->vc_utf = default_utf8;
1709 vc->vc_utf_count = 0;
1711 vc->vc_disp_ctrl = 0;
1712 vc->vc_toggle_meta = 0;
1717 vc->vc_deccm = global_cursor_default;
1720 vt_reset_keyboard(vc->vc_num);
1722 vc->vc_cursor_type = cur_default;
1723 vc->vc_complement_mask = vc->vc_s_complement_mask;
1728 vc->vc_tab_stop[0] = 0x01010100;
1729 vc->vc_tab_stop[1] =
1730 vc->vc_tab_stop[2] =
1731 vc->vc_tab_stop[3] =
1732 vc->vc_tab_stop[4] =
1733 vc->vc_tab_stop[5] =
1734 vc->vc_tab_stop[6] =
1735 vc->vc_tab_stop[7] = 0x01010101;
1737 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1738 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1739 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1747 /* console_lock is held */
1748 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1751 * Control characters can be used in the _middle_
1752 * of an escape sequence.
1754 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1760 if (vc->vc_state == ESosc)
1761 vc->vc_state = ESnormal;
1762 else if (vc->vc_bell_duration)
1763 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1769 vc->vc_pos -= (vc->vc_x << 1);
1770 while (vc->vc_x < vc->vc_cols - 1) {
1772 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1775 vc->vc_pos += (vc->vc_x << 1);
1776 notify_write(vc, '\t');
1778 case 10: case 11: case 12:
1780 if (!is_kbd(vc, lnm))
1787 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1788 vc->vc_disp_ctrl = 1;
1792 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1793 vc->vc_disp_ctrl = 0;
1796 vc->vc_state = ESnormal;
1799 vc->vc_state = ESesc;
1805 vc->vc_state = ESsquare;
1808 switch(vc->vc_state) {
1810 vc->vc_state = ESnormal;
1813 vc->vc_state = ESsquare;
1816 vc->vc_state = ESnonstd;
1819 vc->vc_state = ESpercent;
1832 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1844 vc->vc_state = ESsetG0;
1847 vc->vc_state = ESsetG1;
1850 vc->vc_state = EShash;
1853 reset_terminal(vc, 1);
1855 case '>': /* Numeric keypad */
1856 clr_kbd(vc, kbdapplic);
1858 case '=': /* Appl. keypad */
1859 set_kbd(vc, kbdapplic);
1864 if (c=='P') { /* palette escape sequence */
1865 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1866 vc->vc_par[vc->vc_npar] = 0;
1868 vc->vc_state = ESpalette;
1870 } else if (c=='R') { /* reset palette */
1872 vc->vc_state = ESnormal;
1873 } else if (c>='0' && c<='9')
1874 vc->vc_state = ESosc;
1876 vc->vc_state = ESnormal;
1880 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1881 if (vc->vc_npar == 7) {
1882 int i = vc->vc_par[0] * 3, j = 1;
1883 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1884 vc->vc_palette[i++] += vc->vc_par[j++];
1885 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1886 vc->vc_palette[i++] += vc->vc_par[j++];
1887 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1888 vc->vc_palette[i] += vc->vc_par[j];
1890 vc->vc_state = ESnormal;
1893 vc->vc_state = ESnormal;
1896 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1897 vc->vc_par[vc->vc_npar] = 0;
1899 vc->vc_state = ESgetpars;
1900 if (c == '[') { /* Function key */
1901 vc->vc_state=ESfunckey;
1904 vc->vc_ques = (c == '?');
1908 if (c == ';' && vc->vc_npar < NPAR - 1) {
1911 } else if (c>='0' && c<='9') {
1912 vc->vc_par[vc->vc_npar] *= 10;
1913 vc->vc_par[vc->vc_npar] += c - '0';
1916 vc->vc_state = ESnormal;
1927 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1929 vc->vc_cursor_type = cur_default;
1937 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1939 vc->vc_complement_mask = vc->vc_s_complement_mask;
1945 if (vc->vc_par[0] == 5)
1947 else if (vc->vc_par[0] == 6)
1948 cursor_report(vc, tty);
1960 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1965 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1970 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1975 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1980 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1985 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1990 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1995 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2002 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2005 csi_J(vc, vc->vc_par[0]);
2008 csi_K(vc, vc->vc_par[0]);
2011 csi_L(vc, vc->vc_par[0]);
2014 csi_M(vc, vc->vc_par[0]);
2017 csi_P(vc, vc->vc_par[0]);
2025 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2026 else if (vc->vc_par[0] == 3) {
2027 vc->vc_tab_stop[0] =
2028 vc->vc_tab_stop[1] =
2029 vc->vc_tab_stop[2] =
2030 vc->vc_tab_stop[3] =
2031 vc->vc_tab_stop[4] =
2032 vc->vc_tab_stop[5] =
2033 vc->vc_tab_stop[6] =
2034 vc->vc_tab_stop[7] = 0;
2040 case 'q': /* DECLL - but only 3 leds */
2041 /* map 0,1,2,3 to 0,1,2,4 */
2042 if (vc->vc_par[0] < 4)
2043 vt_set_led_state(vc->vc_num,
2044 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2050 vc->vc_par[1] = vc->vc_rows;
2051 /* Minimum allowed region is 2 lines */
2052 if (vc->vc_par[0] < vc->vc_par[1] &&
2053 vc->vc_par[1] <= vc->vc_rows) {
2054 vc->vc_top = vc->vc_par[0] - 1;
2055 vc->vc_bottom = vc->vc_par[1];
2066 csi_X(vc, vc->vc_par[0]);
2069 csi_at(vc, vc->vc_par[0]);
2071 case ']': /* setterm functions */
2072 setterm_command(vc);
2077 vc->vc_state = ESnormal;
2079 case '@': /* defined in ISO 2022 */
2082 case 'G': /* prelim official escape code */
2083 case '8': /* retained for compatibility */
2089 vc->vc_state = ESnormal;
2092 vc->vc_state = ESnormal;
2094 /* DEC screen alignment test. kludge :-) */
2095 vc->vc_video_erase_char =
2096 (vc->vc_video_erase_char & 0xff00) | 'E';
2098 vc->vc_video_erase_char =
2099 (vc->vc_video_erase_char & 0xff00) | ' ';
2100 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2105 vc->vc_G0_charset = GRAF_MAP;
2107 vc->vc_G0_charset = LAT1_MAP;
2109 vc->vc_G0_charset = IBMPC_MAP;
2111 vc->vc_G0_charset = USER_MAP;
2112 if (vc->vc_charset == 0)
2113 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2114 vc->vc_state = ESnormal;
2118 vc->vc_G1_charset = GRAF_MAP;
2120 vc->vc_G1_charset = LAT1_MAP;
2122 vc->vc_G1_charset = IBMPC_MAP;
2124 vc->vc_G1_charset = USER_MAP;
2125 if (vc->vc_charset == 1)
2126 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2127 vc->vc_state = ESnormal;
2132 vc->vc_state = ESnormal;
2136 /* is_double_width() is based on the wcwidth() implementation by
2137 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2138 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2145 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2150 if (ucs < table[0].first || ucs > table[max].last)
2152 while (max >= min) {
2153 mid = (min + max) / 2;
2154 if (ucs > table[mid].last)
2156 else if (ucs < table[mid].first)
2164 static int is_double_width(uint32_t ucs)
2166 static const struct interval double_width[] = {
2167 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2168 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2169 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2170 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2172 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2175 /* acquires console_lock */
2176 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2178 #ifdef VT_BUF_VRAM_ONLY
2179 #define FLUSH do { } while(0);
2181 #define FLUSH if (draw_x >= 0) { \
2182 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2187 int c, tc, ok, n = 0, draw_x = -1;
2188 unsigned int currcons;
2189 unsigned long draw_from = 0, draw_to = 0;
2191 unsigned char vc_attr;
2192 struct vt_notifier_param param;
2196 u16 himask, charmask;
2204 vc = tty->driver_data;
2206 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2211 currcons = vc->vc_num;
2212 if (!vc_cons_allocated(currcons)) {
2213 /* could this happen? */
2214 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2219 himask = vc->vc_hi_font_mask;
2220 charmask = himask ? 0x1ff : 0xff;
2222 /* undraw cursor first */
2228 while (!tty->stopped && count) {
2238 /* Do no translation at all in control states */
2239 if (vc->vc_state != ESnormal) {
2241 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2242 /* Combine UTF-8 into Unicode in vc_utf_char.
2243 * vc_utf_count is the number of continuation bytes still
2244 * expected to arrive.
2245 * vc_npar is the number of continuation bytes arrived so
2249 if ((c & 0xc0) == 0x80) {
2250 /* Continuation byte received */
2251 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2252 if (vc->vc_utf_count) {
2253 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2255 if (--vc->vc_utf_count) {
2256 /* Still need some bytes */
2259 /* Got a whole character */
2260 c = vc->vc_utf_char;
2261 /* Reject overlong sequences */
2262 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2263 c > utf8_length_changes[vc->vc_npar])
2266 /* Unexpected continuation byte */
2267 vc->vc_utf_count = 0;
2271 /* Single ASCII byte or first byte of a sequence received */
2272 if (vc->vc_utf_count) {
2273 /* Continuation byte expected */
2275 vc->vc_utf_count = 0;
2277 } else if (c > 0x7f) {
2278 /* First byte of a multibyte sequence received */
2280 if ((c & 0xe0) == 0xc0) {
2281 vc->vc_utf_count = 1;
2282 vc->vc_utf_char = (c & 0x1f);
2283 } else if ((c & 0xf0) == 0xe0) {
2284 vc->vc_utf_count = 2;
2285 vc->vc_utf_char = (c & 0x0f);
2286 } else if ((c & 0xf8) == 0xf0) {
2287 vc->vc_utf_count = 3;
2288 vc->vc_utf_char = (c & 0x07);
2289 } else if ((c & 0xfc) == 0xf8) {
2290 vc->vc_utf_count = 4;
2291 vc->vc_utf_char = (c & 0x03);
2292 } else if ((c & 0xfe) == 0xfc) {
2293 vc->vc_utf_count = 5;
2294 vc->vc_utf_char = (c & 0x01);
2296 /* 254 and 255 are invalid */
2299 if (vc->vc_utf_count) {
2300 /* Still need some bytes */
2304 /* Nothing to do if an ASCII byte was received */
2306 /* End of UTF-8 decoding. */
2307 /* c is the received character, or U+FFFD for invalid sequences. */
2308 /* Replace invalid Unicode code points with U+FFFD too */
2309 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2312 } else { /* no utf or alternate charset mode */
2313 tc = vc_translate(vc, c);
2317 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2318 ¶m) == NOTIFY_STOP)
2321 /* If the original code was a control character we
2322 * only allow a glyph to be displayed if the code is
2323 * not normally used (such as for cursor movement) or
2324 * if the disp_ctrl mode has been explicitly enabled.
2325 * Certain characters (as given by the CTRL_ALWAYS
2326 * bitmap) are always displayed as control characters,
2327 * as the console would be pretty useless without
2328 * them; to display an arbitrary font position use the
2329 * direct-to-font zone in UTF-8 mode.
2331 ok = tc && (c >= 32 ||
2332 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2333 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2334 && (c != 127 || vc->vc_disp_ctrl)
2337 if (vc->vc_state == ESnormal && ok) {
2338 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2339 if (is_double_width(c))
2342 /* Now try to find out how to display it */
2343 tc = conv_uni_to_pc(vc, tc);
2344 if (tc & ~charmask) {
2345 if (tc == -1 || tc == -2) {
2346 continue; /* nothing to display */
2348 /* Glyph not found */
2349 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2350 /* In legacy mode use the glyph we get by a 1:1 mapping.
2351 This would make absolutely no sense with Unicode in mind,
2352 but do this for ASCII characters since a font may lack
2353 Unicode mapping info and we don't want to end up with
2354 having question marks only. */
2357 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2358 tc = conv_uni_to_pc(vc, 0xfffd);
2361 tc = conv_uni_to_pc(vc, '?');
2362 if (tc < 0) tc = '?';
2368 vc_attr = vc->vc_attr;
2370 /* invert vc_attr */
2371 if (!vc->vc_can_do_color) {
2372 vc_attr = (vc->vc_attr) ^ 0x08;
2373 } else if (vc->vc_hi_font_mask == 0x100) {
2374 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2376 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2382 if (vc->vc_need_wrap || vc->vc_decim)
2384 if (vc->vc_need_wrap) {
2391 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2392 (vc_attr << 8) + tc,
2393 (u16 *) vc->vc_pos);
2394 if (DO_UPDATE(vc) && draw_x < 0) {
2396 draw_from = vc->vc_pos;
2398 if (vc->vc_x == vc->vc_cols - 1) {
2399 vc->vc_need_wrap = vc->vc_decawm;
2400 draw_to = vc->vc_pos + 2;
2403 draw_to = (vc->vc_pos += 2);
2406 if (!--width) break;
2408 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2409 if (tc < 0) tc = ' ';
2411 notify_write(vc, c);
2422 goto rescan_last_byte;
2427 do_con_trol(tty, vc, orig);
2430 console_conditional_schedule();
2438 * This is the console switching callback.
2440 * Doing console switching in a process context allows
2441 * us to do the switches asynchronously (needed when we want
2442 * to switch due to a keyboard interrupt). Synchronization
2443 * with other console code and prevention of re-entrancy is
2444 * ensured with console_lock.
2446 static void console_callback(struct work_struct *ignored)
2450 if (want_console >= 0) {
2451 if (want_console != fg_console &&
2452 vc_cons_allocated(want_console)) {
2453 hide_cursor(vc_cons[fg_console].d);
2454 change_console(vc_cons[want_console].d);
2455 /* we only changed when the console had already
2456 been allocated - a new console is not created
2457 in an interrupt routine */
2461 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2462 do_poke_blanked_console = 0;
2463 poke_blanked_console();
2465 if (scrollback_delta) {
2466 struct vc_data *vc = vc_cons[fg_console].d;
2468 if (vc->vc_mode == KD_TEXT)
2469 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2470 scrollback_delta = 0;
2472 if (blank_timer_expired) {
2474 blank_timer_expired = 0;
2476 notify_update(vc_cons[fg_console].d);
2481 int set_console(int nr)
2483 struct vc_data *vc = vc_cons[fg_console].d;
2485 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2486 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2489 * Console switch will fail in console_callback() or
2490 * change_console() so there is no point scheduling
2493 * Existing set_console() users don't check the return
2494 * value so this shouldn't break anything
2500 schedule_console_callback();
2505 struct tty_driver *console_driver;
2507 #ifdef CONFIG_VT_CONSOLE
2510 * vt_kmsg_redirect() - Sets/gets the kernel message console
2511 * @new: The new virtual terminal number or -1 if the console should stay
2514 * By default, the kernel messages are always printed on the current virtual
2515 * console. However, the user may modify that default with the
2516 * TIOCL_SETKMSGREDIRECT ioctl call.
2518 * This function sets the kernel message console to be @new. It returns the old
2519 * virtual console number. The virtual terminal number 0 (both as parameter and
2520 * return value) means no redirection (i.e. always printed on the currently
2523 * The parameter -1 means that only the current console is returned, but the
2524 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2525 * case to make the code more understandable.
2527 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2528 * the parameter and always returns 0.
2530 int vt_kmsg_redirect(int new)
2532 static int kmsg_con;
2535 return xchg(&kmsg_con, new);
2541 * Console on virtual terminal
2543 * The console must be locked when we get here.
2546 static void vt_console_print(struct console *co, const char *b, unsigned count)
2548 struct vc_data *vc = vc_cons[fg_console].d;
2550 static DEFINE_SPINLOCK(printing_lock);
2551 const ushort *start;
2556 /* console busy or not yet initialized */
2559 if (!spin_trylock(&printing_lock))
2562 kmsg_console = vt_get_kmsg_redirect();
2563 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2564 vc = vc_cons[kmsg_console - 1].d;
2566 /* read `x' only after setting currcons properly (otherwise
2567 the `x' macro will read the x of the foreground console). */
2570 if (!vc_cons_allocated(fg_console)) {
2572 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2576 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2579 /* undraw cursor first */
2583 start = (ushort *)vc->vc_pos;
2585 /* Contrived structure to try to emulate original need_wrap behaviour
2586 * Problems caused when we have need_wrap set on '\n' character */
2589 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2591 if (CON_IS_VISIBLE(vc))
2592 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2594 if (vc->vc_need_wrap)
2598 if (c == 8) { /* backspace */
2600 start = (ushort *)vc->vc_pos;
2607 start = (ushort *)vc->vc_pos;
2609 if (c == 10 || c == 13)
2612 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2613 notify_write(vc, c);
2615 if (myx == vc->vc_cols - 1) {
2616 vc->vc_need_wrap = 1;
2623 if (CON_IS_VISIBLE(vc))
2624 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2626 if (vc->vc_x == vc->vc_cols) {
2628 vc->vc_need_wrap = 1;
2635 spin_unlock(&printing_lock);
2638 static struct tty_driver *vt_console_device(struct console *c, int *index)
2640 *index = c->index ? c->index-1 : fg_console;
2641 return console_driver;
2644 static struct console vt_console_driver = {
2646 .write = vt_console_print,
2647 .device = vt_console_device,
2648 .unblank = unblank_screen,
2649 .flags = CON_PRINTBUFFER,
2655 * Handling of Linux-specific VC ioctls
2659 * Generally a bit racy with respect to console_lock();.
2661 * There are some functions which don't need it.
2663 * There are some functions which can sleep for arbitrary periods
2664 * (paste_selection) but we don't need the lock there anyway.
2666 * set_selection has locking, and definitely needs it
2669 int tioclinux(struct tty_struct *tty, unsigned long arg)
2672 char __user *p = (char __user *)arg;
2676 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2678 if (get_user(type, p))
2686 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2689 case TIOCL_PASTESEL:
2690 ret = paste_selection(tty);
2692 case TIOCL_UNBLANKSCREEN:
2697 case TIOCL_SELLOADLUT:
2699 ret = sel_loadlut(p);
2702 case TIOCL_GETSHIFTSTATE:
2705 * Make it possible to react to Shift+Mousebutton.
2706 * Note that 'shift_state' is an undocumented
2707 * kernel-internal variable; programs not closely
2708 * related to the kernel should not use this.
2710 data = vt_get_shift_state();
2711 ret = __put_user(data, p);
2713 case TIOCL_GETMOUSEREPORTING:
2714 console_lock(); /* May be overkill */
2715 data = mouse_reporting();
2717 ret = __put_user(data, p);
2719 case TIOCL_SETVESABLANK:
2721 ret = set_vesa_blanking(p);
2724 case TIOCL_GETKMSGREDIRECT:
2725 data = vt_get_kmsg_redirect();
2726 ret = __put_user(data, p);
2728 case TIOCL_SETKMSGREDIRECT:
2729 if (!capable(CAP_SYS_ADMIN)) {
2732 if (get_user(data, p+1))
2735 vt_kmsg_redirect(data);
2738 case TIOCL_GETFGCONSOLE:
2739 /* No locking needed as this is a transiently
2740 correct return anyway if the caller hasn't
2741 disabled switching */
2744 case TIOCL_SCROLLCONSOLE:
2745 if (get_user(lines, (s32 __user *)(p+4))) {
2748 /* Need the console lock here. Note that lots
2749 of other calls need fixing before the lock
2750 is actually useful ! */
2752 scrollfront(vc_cons[fg_console].d, lines);
2757 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2763 case TIOCL_BLANKEDSCREEN:
2764 ret = console_blanked;
2774 * /dev/ttyN handling
2777 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2781 retval = do_con_write(tty, buf, count);
2782 con_flush_chars(tty);
2787 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2790 return 0; /* n_r3964 calls put_char() from interrupt context */
2791 return do_con_write(tty, &ch, 1);
2794 static int con_write_room(struct tty_struct *tty)
2798 return 32768; /* No limit, really; we're not buffering */
2801 static int con_chars_in_buffer(struct tty_struct *tty)
2803 return 0; /* we're not buffering */
2807 * con_throttle and con_unthrottle are only used for
2808 * paste_selection(), which has to stuff in a large number of
2811 static void con_throttle(struct tty_struct *tty)
2815 static void con_unthrottle(struct tty_struct *tty)
2817 struct vc_data *vc = tty->driver_data;
2819 wake_up_interruptible(&vc->paste_wait);
2823 * Turn the Scroll-Lock LED on when the tty is stopped
2825 static void con_stop(struct tty_struct *tty)
2830 console_num = tty->index;
2831 if (!vc_cons_allocated(console_num))
2833 vt_kbd_con_stop(console_num);
2837 * Turn the Scroll-Lock LED off when the console is started
2839 static void con_start(struct tty_struct *tty)
2844 console_num = tty->index;
2845 if (!vc_cons_allocated(console_num))
2847 vt_kbd_con_start(console_num);
2850 static void con_flush_chars(struct tty_struct *tty)
2854 if (in_interrupt()) /* from flush_to_ldisc */
2857 /* if we race with con_close(), vt may be null */
2859 vc = tty->driver_data;
2866 * Allocate the console screen memory.
2868 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2870 unsigned int currcons = tty->index;
2875 ret = vc_allocate(currcons);
2879 vc = vc_cons[currcons].d;
2881 /* Still being freed */
2887 ret = tty_port_install(&vc->port, driver, tty);
2891 tty->driver_data = vc;
2894 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2895 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2896 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2899 tty->termios.c_iflag |= IUTF8;
2901 tty->termios.c_iflag &= ~IUTF8;
2907 static int con_open(struct tty_struct *tty, struct file *filp)
2909 /* everything done in install */
2914 static void con_close(struct tty_struct *tty, struct file *filp)
2916 /* Nothing to do - we defer to shutdown */
2919 static void con_shutdown(struct tty_struct *tty)
2921 struct vc_data *vc = tty->driver_data;
2924 vc->port.tty = NULL;
2928 static int default_color = 7; /* white */
2929 static int default_italic_color = 2; // green (ASCII)
2930 static int default_underline_color = 3; // cyan (ASCII)
2931 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2932 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2933 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2935 static void vc_init(struct vc_data *vc, unsigned int rows,
2936 unsigned int cols, int do_clear)
2942 vc->vc_size_row = cols << 1;
2943 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2946 vc->vc_pos = vc->vc_origin;
2948 for (j=k=0; j<16; j++) {
2949 vc->vc_palette[k++] = default_red[j] ;
2950 vc->vc_palette[k++] = default_grn[j] ;
2951 vc->vc_palette[k++] = default_blu[j] ;
2953 vc->vc_def_color = default_color;
2954 vc->vc_ulcolor = default_underline_color;
2955 vc->vc_itcolor = default_italic_color;
2956 vc->vc_halfcolor = 0x08; /* grey */
2957 init_waitqueue_head(&vc->paste_wait);
2958 reset_terminal(vc, do_clear);
2962 * This routine initializes console interrupts, and does nothing
2963 * else. If you want the screen to clear, call tty_write with
2964 * the appropriate escape-sequence.
2967 static int __init con_init(void)
2969 const char *display_desc = NULL;
2971 unsigned int currcons = 0, i;
2976 display_desc = conswitchp->con_startup();
2977 if (!display_desc) {
2983 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2984 struct con_driver *con_driver = ®istered_con_driver[i];
2986 if (con_driver->con == NULL) {
2987 con_driver->con = conswitchp;
2988 con_driver->desc = display_desc;
2989 con_driver->flag = CON_DRIVER_FLAG_INIT;
2990 con_driver->first = 0;
2991 con_driver->last = MAX_NR_CONSOLES - 1;
2996 for (i = 0; i < MAX_NR_CONSOLES; i++)
2997 con_driver_map[i] = conswitchp;
2999 if (blankinterval) {
3000 blank_state = blank_normal_wait;
3001 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3004 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3005 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3006 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3007 tty_port_init(&vc->port);
3008 visual_init(vc, currcons, 1);
3009 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3010 vc_init(vc, vc->vc_rows, vc->vc_cols,
3011 currcons || !vc->vc_sw->con_save_screen);
3013 currcons = fg_console = 0;
3014 master_display_fg = vc = vc_cons[currcons].d;
3017 gotoxy(vc, vc->vc_x, vc->vc_y);
3020 pr_info("Console: %s %s %dx%d\n",
3021 vc->vc_can_do_color ? "colour" : "mono",
3022 display_desc, vc->vc_cols, vc->vc_rows);
3027 #ifdef CONFIG_VT_CONSOLE
3028 register_console(&vt_console_driver);
3032 console_initcall(con_init);
3034 static const struct tty_operations con_ops = {
3035 .install = con_install,
3039 .write_room = con_write_room,
3040 .put_char = con_put_char,
3041 .flush_chars = con_flush_chars,
3042 .chars_in_buffer = con_chars_in_buffer,
3044 #ifdef CONFIG_COMPAT
3045 .compat_ioctl = vt_compat_ioctl,
3049 .throttle = con_throttle,
3050 .unthrottle = con_unthrottle,
3051 .resize = vt_resize,
3052 .shutdown = con_shutdown
3055 static struct cdev vc0_cdev;
3057 static ssize_t show_tty_active(struct device *dev,
3058 struct device_attribute *attr, char *buf)
3060 return sprintf(buf, "tty%d\n", fg_console + 1);
3062 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3064 static struct attribute *vt_dev_attrs[] = {
3065 &dev_attr_active.attr,
3069 ATTRIBUTE_GROUPS(vt_dev);
3071 int __init vty_init(const struct file_operations *console_fops)
3073 cdev_init(&vc0_cdev, console_fops);
3074 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3075 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3076 panic("Couldn't register /dev/tty0 driver\n");
3077 tty0dev = device_create_with_groups(tty_class, NULL,
3078 MKDEV(TTY_MAJOR, 0), NULL,
3079 vt_dev_groups, "tty0");
3080 if (IS_ERR(tty0dev))
3085 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3086 if (!console_driver)
3087 panic("Couldn't allocate console driver\n");
3089 console_driver->name = "tty";
3090 console_driver->name_base = 1;
3091 console_driver->major = TTY_MAJOR;
3092 console_driver->minor_start = 1;
3093 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3094 console_driver->init_termios = tty_std_termios;
3096 console_driver->init_termios.c_iflag |= IUTF8;
3097 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3098 tty_set_operations(console_driver, &con_ops);
3099 if (tty_register_driver(console_driver))
3100 panic("Couldn't register console driver\n");
3103 #ifdef CONFIG_MDA_CONSOLE
3109 #ifndef VT_SINGLE_DRIVER
3111 static struct class *vtconsole_class;
3113 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3116 struct module *owner = csw->owner;
3117 const char *desc = NULL;
3118 struct con_driver *con_driver;
3119 int i, j = -1, k = -1, retval = -ENODEV;
3121 if (!try_module_get(owner))
3124 WARN_CONSOLE_UNLOCKED();
3126 /* check if driver is registered */
3127 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3128 con_driver = ®istered_con_driver[i];
3130 if (con_driver->con == csw) {
3131 desc = con_driver->desc;
3140 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3142 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3147 module_put(conswitchp->owner);
3149 __module_get(owner);
3153 first = max(first, con_driver->first);
3154 last = min(last, con_driver->last);
3156 for (i = first; i <= last; i++) {
3158 struct vc_data *vc = vc_cons[i].d;
3160 if (con_driver_map[i])
3161 module_put(con_driver_map[i]->owner);
3162 __module_get(owner);
3163 con_driver_map[i] = csw;
3165 if (!vc || !vc->vc_sw)
3170 if (CON_IS_VISIBLE(vc)) {
3175 old_was_color = vc->vc_can_do_color;
3176 vc->vc_sw->con_deinit(vc);
3177 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3178 visual_init(vc, i, 0);
3182 /* If the console changed between mono <-> color, then
3183 * the attributes in the screenbuf will be wrong. The
3184 * following resets all attributes to something sane.
3186 if (old_was_color != vc->vc_can_do_color)
3187 clear_buffer_attributes(vc);
3190 pr_info("Console: switching ");
3192 printk("consoles %d-%d ", first+1, last+1);
3194 struct vc_data *vc = vc_cons[j].d;
3196 printk("to %s %s %dx%d\n",
3197 vc->vc_can_do_color ? "colour" : "mono",
3198 desc, vc->vc_cols, vc->vc_rows);
3205 printk("to %s\n", desc);
3214 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3215 /* unlocked version of unbind_con_driver() */
3216 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3218 struct module *owner = csw->owner;
3219 const struct consw *defcsw = NULL;
3220 struct con_driver *con_driver = NULL, *con_back = NULL;
3221 int i, retval = -ENODEV;
3223 if (!try_module_get(owner))
3226 WARN_CONSOLE_UNLOCKED();
3228 /* check if driver is registered and if it is unbindable */
3229 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3230 con_driver = ®istered_con_driver[i];
3232 if (con_driver->con == csw &&
3233 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3244 /* check if backup driver exists */
3245 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3246 con_back = ®istered_con_driver[i];
3248 if (con_back->con && con_back->con != csw) {
3249 defcsw = con_back->con;
3258 if (!con_is_bound(csw))
3261 first = max(first, con_driver->first);
3262 last = min(last, con_driver->last);
3264 for (i = first; i <= last; i++) {
3265 if (con_driver_map[i] == csw) {
3266 module_put(csw->owner);
3267 con_driver_map[i] = NULL;
3271 if (!con_is_bound(defcsw)) {
3272 const struct consw *defconsw = conswitchp;
3274 defcsw->con_startup();
3275 con_back->flag |= CON_DRIVER_FLAG_INIT;
3277 * vgacon may change the default driver to point
3278 * to dummycon, we restore it here...
3280 conswitchp = defconsw;
3283 if (!con_is_bound(csw))
3284 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3286 /* ignore return value, binding should not fail */
3287 do_bind_con_driver(defcsw, first, last, deflt);
3293 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3295 static int vt_bind(struct con_driver *con)
3297 const struct consw *defcsw = NULL, *csw = NULL;
3298 int i, more = 1, first = -1, last = -1, deflt = 0;
3300 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3305 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3306 struct con_driver *con = ®istered_con_driver[i];
3308 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3320 for (i = con->first; i <= con->last; i++) {
3321 if (con_driver_map[i] == defcsw) {
3326 } else if (first != -1)
3330 if (first == 0 && last == MAX_NR_CONSOLES -1)
3334 do_bind_con_driver(csw, first, last, deflt);
3345 static int vt_unbind(struct con_driver *con)
3347 const struct consw *csw = NULL;
3348 int i, more = 1, first = -1, last = -1, deflt = 0;
3351 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3359 for (i = con->first; i <= con->last; i++) {
3360 if (con_driver_map[i] == csw) {
3365 } else if (first != -1)
3369 if (first == 0 && last == MAX_NR_CONSOLES -1)
3373 ret = do_unbind_con_driver(csw, first, last, deflt);
3387 static inline int vt_bind(struct con_driver *con)
3391 static inline int vt_unbind(struct con_driver *con)
3395 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3397 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3398 const char *buf, size_t count)
3400 struct con_driver *con = dev_get_drvdata(dev);
3401 int bind = simple_strtoul(buf, NULL, 0);
3415 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3418 struct con_driver *con = dev_get_drvdata(dev);
3419 int bind = con_is_bound(con->con);
3421 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3424 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3427 struct con_driver *con = dev_get_drvdata(dev);
3429 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3430 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3435 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3436 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3438 static struct attribute *con_dev_attrs[] = {
3439 &dev_attr_bind.attr,
3440 &dev_attr_name.attr,
3444 ATTRIBUTE_GROUPS(con_dev);
3446 static int vtconsole_init_device(struct con_driver *con)
3448 con->flag |= CON_DRIVER_FLAG_ATTR;
3452 static void vtconsole_deinit_device(struct con_driver *con)
3454 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3458 * con_is_bound - checks if driver is bound to the console
3459 * @csw: console driver
3461 * RETURNS: zero if unbound, nonzero if bound
3463 * Drivers can call this and if zero, they should release
3464 * all resources allocated on con_startup()
3466 int con_is_bound(const struct consw *csw)
3470 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3471 if (con_driver_map[i] == csw) {
3479 EXPORT_SYMBOL(con_is_bound);
3482 * con_debug_enter - prepare the console for the kernel debugger
3483 * @sw: console driver
3485 * Called when the console is taken over by the kernel debugger, this
3486 * function needs to save the current console state, then put the console
3487 * into a state suitable for the kernel debugger.
3490 * Zero on success, nonzero if a failure occurred when trying to prepare
3491 * the console for the debugger.
3493 int con_debug_enter(struct vc_data *vc)
3497 saved_fg_console = fg_console;
3498 saved_last_console = last_console;
3499 saved_want_console = want_console;
3500 saved_vc_mode = vc->vc_mode;
3501 saved_console_blanked = console_blanked;
3502 vc->vc_mode = KD_TEXT;
3503 console_blanked = 0;
3504 if (vc->vc_sw->con_debug_enter)
3505 ret = vc->vc_sw->con_debug_enter(vc);
3506 #ifdef CONFIG_KGDB_KDB
3507 /* Set the initial LINES variable if it is not already set */
3508 if (vc->vc_rows < 999) {
3511 const char *setargs[3] = {
3516 if (kdbgetintenv(setargs[0], &linecount)) {
3517 snprintf(lns, 4, "%i", vc->vc_rows);
3518 kdb_set(2, setargs);
3521 if (vc->vc_cols < 999) {
3524 const char *setargs[3] = {
3529 if (kdbgetintenv(setargs[0], &colcount)) {
3530 snprintf(cols, 4, "%i", vc->vc_cols);
3531 kdb_set(2, setargs);
3534 #endif /* CONFIG_KGDB_KDB */
3537 EXPORT_SYMBOL_GPL(con_debug_enter);
3540 * con_debug_leave - restore console state
3541 * @sw: console driver
3543 * Restore the console state to what it was before the kernel debugger
3547 * Zero on success, nonzero if a failure occurred when trying to restore
3550 int con_debug_leave(void)
3555 fg_console = saved_fg_console;
3556 last_console = saved_last_console;
3557 want_console = saved_want_console;
3558 console_blanked = saved_console_blanked;
3559 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3561 vc = vc_cons[fg_console].d;
3562 if (vc->vc_sw->con_debug_leave)
3563 ret = vc->vc_sw->con_debug_leave(vc);
3566 EXPORT_SYMBOL_GPL(con_debug_leave);
3568 static int do_register_con_driver(const struct consw *csw, int first, int last)
3570 struct module *owner = csw->owner;
3571 struct con_driver *con_driver;
3575 WARN_CONSOLE_UNLOCKED();
3577 if (!try_module_get(owner))
3580 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3581 con_driver = ®istered_con_driver[i];
3583 /* already registered */
3584 if (con_driver->con == csw)
3591 desc = csw->con_startup();
3599 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3600 con_driver = ®istered_con_driver[i];
3602 if (con_driver->con == NULL &&
3603 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3604 con_driver->con = csw;
3605 con_driver->desc = desc;
3606 con_driver->node = i;
3607 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3608 CON_DRIVER_FLAG_INIT;
3609 con_driver->first = first;
3610 con_driver->last = last;
3620 device_create_with_groups(vtconsole_class, NULL,
3621 MKDEV(0, con_driver->node),
3622 con_driver, con_dev_groups,
3623 "vtcon%i", con_driver->node);
3624 if (IS_ERR(con_driver->dev)) {
3625 printk(KERN_WARNING "Unable to create device for %s; "
3626 "errno = %ld\n", con_driver->desc,
3627 PTR_ERR(con_driver->dev));
3628 con_driver->dev = NULL;
3630 vtconsole_init_device(con_driver);
3640 * do_unregister_con_driver - unregister console driver from console layer
3641 * @csw: console driver
3643 * DESCRIPTION: All drivers that registers to the console layer must
3644 * call this function upon exit, or if the console driver is in a state
3645 * where it won't be able to handle console services, such as the
3646 * framebuffer console without loaded framebuffer drivers.
3648 * The driver must unbind first prior to unregistration.
3650 int do_unregister_con_driver(const struct consw *csw)
3654 /* cannot unregister a bound driver */
3655 if (con_is_bound(csw))
3658 if (csw == conswitchp)
3661 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3662 struct con_driver *con_driver = ®istered_con_driver[i];
3664 if (con_driver->con == csw) {
3666 * Defer the removal of the sysfs entries since that
3667 * will acquire the kernfs s_active lock and we can't
3668 * acquire this lock while holding the console lock:
3669 * the unbind sysfs entry imposes already the opposite
3670 * order. Reset con already here to prevent any later
3671 * lookup to succeed and mark this slot as zombie, so
3672 * it won't get reused until we complete the removal
3673 * in the deferred work.
3675 con_driver->con = NULL;
3676 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3677 schedule_work(&con_driver_unregister_work);
3685 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3687 static void con_driver_unregister_callback(struct work_struct *ignored)
3693 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3694 struct con_driver *con_driver = ®istered_con_driver[i];
3696 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3701 vtconsole_deinit_device(con_driver);
3702 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3706 if (WARN_ON_ONCE(con_driver->con))
3707 con_driver->con = NULL;
3708 con_driver->desc = NULL;
3709 con_driver->dev = NULL;
3710 con_driver->node = 0;
3711 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3712 con_driver->flag = 0;
3713 con_driver->first = 0;
3714 con_driver->last = 0;
3721 * If we support more console drivers, this function is used
3722 * when a driver wants to take over some existing consoles
3723 * and become default driver for newly opened ones.
3725 * do_take_over_console is basically a register followed by unbind
3727 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3731 err = do_register_con_driver(csw, first, last);
3733 * If we get an busy error we still want to bind the console driver
3734 * and return success, as we may have unbound the console driver
3735 * but not unregistered it.
3740 do_bind_con_driver(csw, first, last, deflt);
3744 EXPORT_SYMBOL_GPL(do_take_over_console);
3748 * give_up_console is a wrapper to unregister_con_driver. It will only
3749 * work if driver is fully unbound.
3751 void give_up_console(const struct consw *csw)
3754 do_unregister_con_driver(csw);
3758 static int __init vtconsole_class_init(void)
3762 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3763 if (IS_ERR(vtconsole_class)) {
3764 printk(KERN_WARNING "Unable to create vt console class; "
3765 "errno = %ld\n", PTR_ERR(vtconsole_class));
3766 vtconsole_class = NULL;
3769 /* Add system drivers to sysfs */
3770 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771 struct con_driver *con = ®istered_con_driver[i];
3773 if (con->con && !con->dev) {
3775 device_create_with_groups(vtconsole_class, NULL,
3776 MKDEV(0, con->node),
3777 con, con_dev_groups,
3778 "vtcon%i", con->node);
3780 if (IS_ERR(con->dev)) {
3781 printk(KERN_WARNING "Unable to create "
3782 "device for %s; errno = %ld\n",
3783 con->desc, PTR_ERR(con->dev));
3786 vtconsole_init_device(con);
3793 postcore_initcall(vtconsole_class_init);
3801 static int set_vesa_blanking(char __user *p)
3805 if (get_user(mode, p + 1))
3808 vesa_blank_mode = (mode < 4) ? mode : 0;
3812 void do_blank_screen(int entering_gfx)
3814 struct vc_data *vc = vc_cons[fg_console].d;
3817 WARN_CONSOLE_UNLOCKED();
3819 if (console_blanked) {
3820 if (blank_state == blank_vesa_wait) {
3821 blank_state = blank_off;
3822 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3827 /* entering graphics mode? */
3831 vc->vc_sw->con_blank(vc, -1, 1);
3832 console_blanked = fg_console + 1;
3833 blank_state = blank_off;
3838 if (blank_state != blank_normal_wait)
3840 blank_state = blank_off;
3842 /* don't blank graphics */
3843 if (vc->vc_mode != KD_TEXT) {
3844 console_blanked = fg_console + 1;
3849 del_timer_sync(&console_timer);
3850 blank_timer_expired = 0;
3853 /* In case we need to reset origin, blanking hook returns 1 */
3854 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3855 console_blanked = fg_console + 1;
3859 if (console_blank_hook && console_blank_hook(1))
3862 if (vesa_off_interval && vesa_blank_mode) {
3863 blank_state = blank_vesa_wait;
3864 mod_timer(&console_timer, jiffies + vesa_off_interval);
3866 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3868 EXPORT_SYMBOL(do_blank_screen);
3871 * Called by timer as well as from vt_console_driver
3873 void do_unblank_screen(int leaving_gfx)
3877 /* This should now always be called from a "sane" (read: can schedule)
3878 * context for the sake of the low level drivers, except in the special
3879 * case of oops_in_progress
3881 if (!oops_in_progress)
3884 WARN_CONSOLE_UNLOCKED();
3887 if (!console_blanked)
3889 if (!vc_cons_allocated(fg_console)) {
3891 pr_warn("unblank_screen: tty %d not allocated ??\n",
3895 vc = vc_cons[fg_console].d;
3896 /* Try to unblank in oops case too */
3897 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3898 return; /* but leave console_blanked != 0 */
3900 if (blankinterval) {
3901 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3902 blank_state = blank_normal_wait;
3905 console_blanked = 0;
3906 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3907 /* Low-level driver cannot restore -> do it ourselves */
3909 if (console_blank_hook)
3910 console_blank_hook(0);
3913 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3915 EXPORT_SYMBOL(do_unblank_screen);
3918 * This is called by the outside world to cause a forced unblank, mostly for
3919 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3920 * call it with 1 as an argument and so force a mode restore... that may kill
3921 * X or at least garbage the screen but would also make the Oops visible...
3923 void unblank_screen(void)
3925 do_unblank_screen(0);
3929 * We defer the timer blanking to work queue so it can take the console mutex
3930 * (console operations can still happen at irq time, but only from printk which
3931 * has the console mutex. Not perfect yet, but better than no locking
3933 static void blank_screen_t(unsigned long dummy)
3935 if (unlikely(!keventd_up())) {
3936 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3939 blank_timer_expired = 1;
3940 schedule_work(&console_work);
3943 void poke_blanked_console(void)
3945 WARN_CONSOLE_UNLOCKED();
3947 /* Add this so we quickly catch whoever might call us in a non
3948 * safe context. Nowadays, unblank_screen() isn't to be called in
3949 * atomic contexts and is allowed to schedule (with the special case
3950 * of oops_in_progress, but that isn't of any concern for this
3955 /* This isn't perfectly race free, but a race here would be mostly harmless,
3956 * at worse, we'll do a spurrious blank and it's unlikely
3958 del_timer(&console_timer);
3959 blank_timer_expired = 0;
3961 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3963 if (console_blanked)
3965 else if (blankinterval) {
3966 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3967 blank_state = blank_normal_wait;
3975 static void set_palette(struct vc_data *vc)
3977 WARN_CONSOLE_UNLOCKED();
3979 if (vc->vc_mode != KD_GRAPHICS)
3980 vc->vc_sw->con_set_palette(vc, color_table);
3984 * Load palette into the DAC registers. arg points to a colour
3985 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3988 int con_set_cmap(unsigned char __user *arg)
3991 unsigned char colormap[3*16];
3993 if (copy_from_user(colormap, arg, sizeof(colormap)))
3997 for (i = k = 0; i < 16; i++) {
3998 default_red[i] = colormap[k++];
3999 default_grn[i] = colormap[k++];
4000 default_blu[i] = colormap[k++];
4002 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4003 if (!vc_cons_allocated(i))
4005 for (j = k = 0; j < 16; j++) {
4006 vc_cons[i].d->vc_palette[k++] = default_red[j];
4007 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4008 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4010 set_palette(vc_cons[i].d);
4017 int con_get_cmap(unsigned char __user *arg)
4020 unsigned char colormap[3*16];
4023 for (i = k = 0; i < 16; i++) {
4024 colormap[k++] = default_red[i];
4025 colormap[k++] = default_grn[i];
4026 colormap[k++] = default_blu[i];
4030 if (copy_to_user(arg, colormap, sizeof(colormap)))
4036 void reset_palette(struct vc_data *vc)
4039 for (j=k=0; j<16; j++) {
4040 vc->vc_palette[k++] = default_red[j];
4041 vc->vc_palette[k++] = default_grn[j];
4042 vc->vc_palette[k++] = default_blu[j];
4050 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4051 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4052 * depending on width) reserved for each character which is kinda wasty, but
4053 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4054 * is up to the actual low-level console-driver convert data into its favorite
4055 * format (maybe we should add a `fontoffset' field to the `display'
4056 * structure so we won't have to convert the fontdata all the time.
4060 #define max_font_size 65536
4062 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4064 struct console_font font;
4069 font.data = kmalloc(max_font_size, GFP_KERNEL);
4076 if (vc->vc_mode != KD_TEXT)
4078 else if (vc->vc_sw->con_font_get)
4079 rc = vc->vc_sw->con_font_get(vc, &font);
4087 c = (font.width+7)/8 * 32 * font.charcount;
4089 if (op->data && font.charcount > op->charcount)
4091 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4092 if (font.width > op->width || font.height > op->height)
4095 if (font.width != 8)
4097 else if ((op->height && font.height > op->height) ||
4104 op->height = font.height;
4105 op->width = font.width;
4106 op->charcount = font.charcount;
4108 if (op->data && copy_to_user(op->data, font.data, c))
4116 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4118 struct console_font font;
4122 if (vc->vc_mode != KD_TEXT)
4126 if (op->charcount > 512)
4128 if (!op->height) { /* Need to guess font height [compat] */
4130 u8 __user *charmap = op->data;
4133 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4134 so that we can get rid of this soon */
4135 if (!(op->flags & KD_FONT_FLAG_OLD))
4137 for (h = 32; h > 0; h--)
4138 for (i = 0; i < op->charcount; i++) {
4139 if (get_user(tmp, &charmap[32*i+h-1]))
4148 if (op->width <= 0 || op->width > 32 || op->height > 32)
4150 size = (op->width+7)/8 * 32 * op->charcount;
4151 if (size > max_font_size)
4153 font.charcount = op->charcount;
4154 font.height = op->height;
4155 font.width = op->width;
4156 font.data = memdup_user(op->data, size);
4157 if (IS_ERR(font.data))
4158 return PTR_ERR(font.data);
4160 if (vc->vc_mode != KD_TEXT)
4162 else if (vc->vc_sw->con_font_set)
4163 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4171 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4173 struct console_font font = {.width = op->width, .height = op->height};
4174 char name[MAX_FONT_NAME];
4181 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4184 name[MAX_FONT_NAME - 1] = 0;
4187 if (vc->vc_mode != KD_TEXT) {
4191 if (vc->vc_sw->con_font_default)
4192 rc = vc->vc_sw->con_font_default(vc, &font, s);
4197 op->width = font.width;
4198 op->height = font.height;
4203 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4205 int con = op->height;
4210 if (vc->vc_mode != KD_TEXT)
4212 else if (!vc->vc_sw->con_font_copy)
4214 else if (con < 0 || !vc_cons_allocated(con))
4216 else if (con == vc->vc_num) /* nothing to do */
4219 rc = vc->vc_sw->con_font_copy(vc, con);
4224 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4227 case KD_FONT_OP_SET:
4228 return con_font_set(vc, op);
4229 case KD_FONT_OP_GET:
4230 return con_font_get(vc, op);
4231 case KD_FONT_OP_SET_DEFAULT:
4232 return con_font_default(vc, op);
4233 case KD_FONT_OP_COPY:
4234 return con_font_copy(vc, op);
4240 * Interface exported to selection and vcs.
4243 /* used by selection */
4244 u16 screen_glyph(struct vc_data *vc, int offset)
4246 u16 w = scr_readw(screenpos(vc, offset, 1));
4249 if (w & vc->vc_hi_font_mask)
4253 EXPORT_SYMBOL_GPL(screen_glyph);
4255 /* used by vcs - note the word offset */
4256 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4258 return screenpos(vc, 2 * w_offset, viewed);
4261 void getconsxy(struct vc_data *vc, unsigned char *p)
4267 void putconsxy(struct vc_data *vc, unsigned char *p)
4270 gotoxy(vc, p[0], p[1]);
4274 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4276 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4277 return softcursor_original;
4278 return scr_readw(org);
4281 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4283 scr_writew(val, org);
4284 if ((unsigned long)org == vc->vc_pos) {
4285 softcursor_original = -1;
4290 void vcs_scr_updated(struct vc_data *vc)
4296 * Visible symbols for modules
4299 EXPORT_SYMBOL(color_table);
4300 EXPORT_SYMBOL(default_red);
4301 EXPORT_SYMBOL(default_grn);
4302 EXPORT_SYMBOL(default_blu);
4303 EXPORT_SYMBOL(update_region);
4304 EXPORT_SYMBOL(redraw_screen);
4305 EXPORT_SYMBOL(vc_resize);
4306 EXPORT_SYMBOL(fg_console);
4307 EXPORT_SYMBOL(console_blank_hook);
4308 EXPORT_SYMBOL(console_blanked);
4309 EXPORT_SYMBOL(vc_cons);
4310 EXPORT_SYMBOL(global_cursor_default);
4311 #ifndef VT_SINGLE_DRIVER
4312 EXPORT_SYMBOL(give_up_console);