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/signal.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;
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 static inline bool con_is_fg(const struct vc_data *vc)
282 return vc->vc_num == fg_console;
285 static inline bool con_should_update(const struct vc_data *vc)
287 return con_is_visible(vc) && !console_blanked;
290 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
295 p = (unsigned short *)(vc->vc_origin + offset);
296 else if (!vc->vc_sw->con_screen_pos)
297 p = (unsigned short *)(vc->vc_visible_origin + offset);
299 p = vc->vc_sw->con_screen_pos(vc, offset);
303 /* Called from the keyboard irq path.. */
304 static inline void scrolldelta(int lines)
307 /* scrolldelta needs some kind of consistency lock, but the BKL was
308 and still is not protecting versus the scheduled back end */
309 scrollback_delta += lines;
310 schedule_console_callback();
313 void schedule_console_callback(void)
315 schedule_work(&console_work);
318 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
319 enum con_scroll dir, unsigned int nr)
325 if (b > vc->vc_rows || t >= b || nr < 1)
327 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
330 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
331 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
334 clear = s + (b - t - nr) * vc->vc_cols;
337 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
338 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
341 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
343 unsigned int xx, yy, offset;
347 if (!vc->vc_sw->con_getxy) {
348 offset = (start - vc->vc_origin) / 2;
349 xx = offset % vc->vc_cols;
350 yy = offset / vc->vc_cols;
353 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
357 u16 attrib = scr_readw(p) & 0xff00;
360 while (xx < vc->vc_cols && count) {
361 if (attrib != (scr_readw(p) & 0xff00)) {
363 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
366 attrib = scr_readw(p) & 0xff00;
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (vc->vc_sw->con_getxy) {
380 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385 void update_region(struct vc_data *vc, unsigned long start, int count)
387 WARN_CONSOLE_UNLOCKED();
389 if (con_should_update(vc)) {
391 do_update_region(vc, start, count);
396 /* Structure of attributes is hardware-dependent */
398 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
399 u8 _underline, u8 _reverse, u8 _italic)
401 if (vc->vc_sw->con_build_attr)
402 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
403 _blink, _underline, _reverse, _italic);
406 * ++roman: I completely changed the attribute format for monochrome
407 * mode (!can_do_color). The formerly used MDA (monochrome display
408 * adapter) format didn't allow the combination of certain effects.
409 * Now the attribute is just a bit vector:
410 * Bit 0..1: intensity (0..2)
417 if (!vc->vc_can_do_color)
420 (_underline ? 4 : 0) |
424 a = (a & 0xF0) | vc->vc_itcolor;
426 a = (a & 0xf0) | vc->vc_ulcolor;
427 else if (_intensity == 0)
428 a = (a & 0xf0) | vc->vc_halfcolor;
430 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
435 if (vc->vc_hi_font_mask == 0x100)
441 static void update_attr(struct vc_data *vc)
443 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
444 vc->vc_blink, vc->vc_underline,
445 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
446 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
449 /* Note: inverting the screen twice should revert to the original state */
450 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
454 WARN_CONSOLE_UNLOCKED();
457 p = screenpos(vc, offset, viewed);
458 if (vc->vc_sw->con_invert_region) {
459 vc->vc_sw->con_invert_region(vc, p, count);
465 if (!vc->vc_can_do_color) {
472 } else if (vc->vc_hi_font_mask == 0x100) {
475 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
482 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
489 if (con_should_update(vc))
490 do_update_region(vc, (unsigned long) p, count);
494 /* used by selection: complement pointer position */
495 void complement_pos(struct vc_data *vc, int offset)
497 static int old_offset = -1;
498 static unsigned short old;
499 static unsigned short oldx, oldy;
501 WARN_CONSOLE_UNLOCKED();
503 if (old_offset != -1 && old_offset >= 0 &&
504 old_offset < vc->vc_screenbuf_size) {
505 scr_writew(old, screenpos(vc, old_offset, 1));
506 if (con_should_update(vc))
507 vc->vc_sw->con_putc(vc, old, oldy, oldx);
513 if (offset != -1 && offset >= 0 &&
514 offset < vc->vc_screenbuf_size) {
517 p = screenpos(vc, offset, 1);
519 new = old ^ vc->vc_complement_mask;
521 if (con_should_update(vc)) {
522 oldx = (offset >> 1) % vc->vc_cols;
523 oldy = (offset >> 1) / vc->vc_cols;
524 vc->vc_sw->con_putc(vc, new, oldy, oldx);
530 static void insert_char(struct vc_data *vc, unsigned int nr)
532 unsigned short *p = (unsigned short *) vc->vc_pos;
534 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
535 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
536 vc->vc_need_wrap = 0;
537 if (con_should_update(vc))
538 do_update_region(vc, (unsigned long) p,
539 vc->vc_cols - vc->vc_x);
542 static void delete_char(struct vc_data *vc, unsigned int nr)
544 unsigned short *p = (unsigned short *) vc->vc_pos;
546 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
547 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
549 vc->vc_need_wrap = 0;
550 if (con_should_update(vc))
551 do_update_region(vc, (unsigned long) p,
552 vc->vc_cols - vc->vc_x);
555 static int softcursor_original = -1;
557 static void add_softcursor(struct vc_data *vc)
559 int i = scr_readw((u16 *) vc->vc_pos);
560 u32 type = vc->vc_cursor_type;
562 if (! (type & 0x10)) return;
563 if (softcursor_original != -1) return;
564 softcursor_original = i;
565 i |= ((type >> 8) & 0xff00 );
566 i ^= ((type) & 0xff00 );
567 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
568 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
569 scr_writew(i, (u16 *) vc->vc_pos);
570 if (con_should_update(vc))
571 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
574 static void hide_softcursor(struct vc_data *vc)
576 if (softcursor_original != -1) {
577 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
578 if (con_should_update(vc))
579 vc->vc_sw->con_putc(vc, softcursor_original,
581 softcursor_original = -1;
585 static void hide_cursor(struct vc_data *vc)
590 vc->vc_sw->con_cursor(vc, CM_ERASE);
594 static void set_cursor(struct vc_data *vc)
596 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
602 if ((vc->vc_cursor_type & 0x0f) != 1)
603 vc->vc_sw->con_cursor(vc, CM_DRAW);
608 static void set_origin(struct vc_data *vc)
610 WARN_CONSOLE_UNLOCKED();
612 if (!con_is_visible(vc) ||
613 !vc->vc_sw->con_set_origin ||
614 !vc->vc_sw->con_set_origin(vc))
615 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
616 vc->vc_visible_origin = vc->vc_origin;
617 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
618 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
621 static void save_screen(struct vc_data *vc)
623 WARN_CONSOLE_UNLOCKED();
625 if (vc->vc_sw->con_save_screen)
626 vc->vc_sw->con_save_screen(vc);
629 static void flush_scrollback(struct vc_data *vc)
631 WARN_CONSOLE_UNLOCKED();
633 if (vc->vc_sw->con_flush_scrollback)
634 vc->vc_sw->con_flush_scrollback(vc);
638 * Redrawing of screen
641 void clear_buffer_attributes(struct vc_data *vc)
643 unsigned short *p = (unsigned short *)vc->vc_origin;
644 int count = vc->vc_screenbuf_size / 2;
645 int mask = vc->vc_hi_font_mask | 0xff;
647 for (; count > 0; count--, p++) {
648 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
652 void redraw_screen(struct vc_data *vc, int is_switch)
656 WARN_CONSOLE_UNLOCKED();
660 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
665 struct vc_data *old_vc = vc_cons[fg_console].d;
668 if (!con_is_visible(vc))
670 *vc->vc_display_fg = vc;
671 fg_console = vc->vc_num;
673 if (!con_is_visible(old_vc)) {
678 sysfs_notify(&tty0dev->kobj, NULL, "active");
686 int old_was_color = vc->vc_can_do_color;
689 update = vc->vc_sw->con_switch(vc);
692 * If console changed from mono<->color, the best we can do
693 * is to clear the buffer attributes. As it currently stands,
694 * rebuilding new attributes from the old buffer is not doable
695 * without overly complex code.
697 if (old_was_color != vc->vc_can_do_color) {
699 clear_buffer_attributes(vc);
702 /* Forcibly update if we're panicing */
703 if ((update && vc->vc_mode != KD_GRAPHICS) ||
704 vt_force_oops_output(vc))
705 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
710 compute_shiftstate();
716 * Allocation, freeing and resizing of VTs.
719 int vc_cons_allocated(unsigned int i)
721 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
724 static void visual_init(struct vc_data *vc, int num, int init)
726 /* ++Geert: vc->vc_sw->con_init determines console size */
728 module_put(vc->vc_sw->owner);
729 vc->vc_sw = conswitchp;
730 #ifndef VT_SINGLE_DRIVER
731 if (con_driver_map[num])
732 vc->vc_sw = con_driver_map[num];
734 __module_get(vc->vc_sw->owner);
736 vc->vc_display_fg = &master_display_fg;
737 if (vc->vc_uni_pagedir_loc)
739 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
740 vc->vc_uni_pagedir = NULL;
741 vc->vc_hi_font_mask = 0;
742 vc->vc_complement_mask = 0;
743 vc->vc_can_do_color = 0;
744 vc->vc_panic_force_write = false;
745 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
746 vc->vc_sw->con_init(vc, init);
747 if (!vc->vc_complement_mask)
748 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
749 vc->vc_s_complement_mask = vc->vc_complement_mask;
750 vc->vc_size_row = vc->vc_cols << 1;
751 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
754 static void vc_port_destruct(struct tty_port *port)
756 struct vc_data *vc = container_of(port, struct vc_data, port);
761 static const struct tty_port_operations vc_port_ops = {
762 .destruct = vc_port_destruct,
766 * Change # of rows and columns (0 means unchanged/the size of fg_console)
767 * [this is to be used together with some user program
768 * like resize that changes the hardware videomode]
770 #define VC_MAXCOL (32767)
771 #define VC_MAXROW (32767)
773 int vc_allocate(unsigned int currcons) /* return 0 on success */
775 struct vt_notifier_param param;
779 WARN_CONSOLE_UNLOCKED();
781 if (currcons >= MAX_NR_CONSOLES)
784 if (vc_cons[currcons].d)
787 /* due to the granularity of kmalloc, we waste some memory here */
788 /* the alloc is done in two steps, to optimize the common situation
789 of a 25x80 console (structsize=216, screenbuf_size=4000) */
790 /* although the numbers above are not valid since long ago, the
791 point is still up-to-date and the comment still has its value
792 even if only as a historical artifact. --mj, July 1998 */
793 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
797 vc_cons[currcons].d = vc;
798 tty_port_init(&vc->port);
799 vc->port.ops = &vc_port_ops;
800 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
802 visual_init(vc, currcons, 1);
804 if (!*vc->vc_uni_pagedir_loc)
805 con_set_default_unimap(vc);
808 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
809 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
812 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
813 if (!vc->vc_screenbuf)
816 /* If no drivers have overridden us and the user didn't pass a
817 boot option, default to displaying the cursor */
818 if (global_cursor_default == -1)
819 global_cursor_default = 1;
821 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
822 vcs_make_sysfs(currcons);
823 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
828 vc_cons[currcons].d = NULL;
832 static inline int resize_screen(struct vc_data *vc, int width, int height,
835 /* Resizes the resolution of the display adapater */
838 if (vc->vc_sw->con_resize)
839 err = vc->vc_sw->con_resize(vc, width, height, user);
845 * vc_do_resize - resizing method for the tty
846 * @tty: tty being resized
847 * @real_tty: real tty (different to tty if a pty/tty pair)
848 * @vc: virtual console private data
852 * Resize a virtual console, clipping according to the actual constraints.
853 * If the caller passes a tty structure then update the termios winsize
854 * information and perform any necessary signal handling.
856 * Caller must hold the console semaphore. Takes the termios rwsem and
857 * ctrl_lock of the tty IFF a tty is passed.
860 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
861 unsigned int cols, unsigned int lines)
863 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
865 unsigned int old_rows, old_row_size;
866 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
868 unsigned short *oldscreen, *newscreen;
870 WARN_CONSOLE_UNLOCKED();
875 user = vc->vc_resize_user;
876 vc->vc_resize_user = 0;
878 if (cols > VC_MAXCOL || lines > VC_MAXROW)
881 new_cols = (cols ? cols : vc->vc_cols);
882 new_rows = (lines ? lines : vc->vc_rows);
883 new_row_size = new_cols << 1;
884 new_screen_size = new_row_size * new_rows;
886 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
888 * This function is being called here to cover the case
889 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
890 * passing the same fb_var_screeninfo containing the fields
891 * yres/xres equal to a number non-multiple of vc_font.height
892 * and yres_virtual/xres_virtual equal to number lesser than the
893 * vc_font.height and yres/xres.
894 * In the second call, the struct fb_var_screeninfo isn't
895 * being modified by the underlying driver because of the
896 * if above, and this causes the fbcon_display->vrows to become
897 * negative and it eventually leads to out-of-bound
898 * access by the imageblit function.
899 * To give the correct values to the struct and to not have
900 * to deal with possible errors from the code below, we call
901 * the resize_screen here as well.
903 return resize_screen(vc, new_cols, new_rows, user);
906 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
908 newscreen = kzalloc(new_screen_size, GFP_USER);
915 old_rows = vc->vc_rows;
916 old_row_size = vc->vc_size_row;
918 err = resize_screen(vc, new_cols, new_rows, user);
924 vc->vc_rows = new_rows;
925 vc->vc_cols = new_cols;
926 vc->vc_size_row = new_row_size;
927 vc->vc_screenbuf_size = new_screen_size;
929 rlth = min(old_row_size, new_row_size);
930 rrem = new_row_size - rlth;
931 old_origin = vc->vc_origin;
932 new_origin = (long) newscreen;
933 new_scr_end = new_origin + new_screen_size;
935 if (vc->vc_y > new_rows) {
936 if (old_rows - vc->vc_y < new_rows) {
938 * Cursor near the bottom, copy contents from the
941 old_origin += (old_rows - new_rows) * old_row_size;
944 * Cursor is in no man's land, copy 1/2 screenful
945 * from the top and bottom of cursor position
947 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
951 end = old_origin + old_row_size * min(old_rows, new_rows);
955 while (old_origin < end) {
956 scr_memcpyw((unsigned short *) new_origin,
957 (unsigned short *) old_origin, rlth);
959 scr_memsetw((void *)(new_origin + rlth),
960 vc->vc_video_erase_char, rrem);
961 old_origin += old_row_size;
962 new_origin += new_row_size;
964 if (new_scr_end > new_origin)
965 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
966 new_scr_end - new_origin);
967 oldscreen = vc->vc_screenbuf;
968 vc->vc_screenbuf = newscreen;
969 vc->vc_screenbuf_size = new_screen_size;
973 /* do part of a reset_terminal() */
975 vc->vc_bottom = vc->vc_rows;
976 gotoxy(vc, vc->vc_x, vc->vc_y);
980 /* Rewrite the requested winsize data with the actual
983 memset(&ws, 0, sizeof(ws));
984 ws.ws_row = vc->vc_rows;
985 ws.ws_col = vc->vc_cols;
986 ws.ws_ypixel = vc->vc_scan_lines;
987 tty_do_resize(tty, &ws);
990 if (con_is_visible(vc))
992 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
998 * vc_resize - resize a VT
999 * @vc: virtual console
1003 * Resize a virtual console as seen from the console end of things. We
1004 * use the common vc_do_resize methods to update the structures. The
1005 * caller must hold the console sem to protect console internals and
1009 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1011 return vc_do_resize(vc->port.tty, vc, cols, rows);
1015 * vt_resize - resize a VT
1016 * @tty: tty to resize
1017 * @ws: winsize attributes
1019 * Resize a virtual terminal. This is called by the tty layer as we
1020 * register our own handler for resizing. The mutual helper does all
1023 * Takes the console sem and the called methods then take the tty
1024 * termios_rwsem and the tty ctrl_lock in that order.
1026 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1028 struct vc_data *vc = tty->driver_data;
1032 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1037 struct vc_data *vc_deallocate(unsigned int currcons)
1039 struct vc_data *vc = NULL;
1041 WARN_CONSOLE_UNLOCKED();
1043 if (vc_cons_allocated(currcons)) {
1044 struct vt_notifier_param param;
1046 param.vc = vc = vc_cons[currcons].d;
1047 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1048 vcs_remove_sysfs(currcons);
1049 vc->vc_sw->con_deinit(vc);
1050 put_pid(vc->vt_pid);
1051 module_put(vc->vc_sw->owner);
1052 kfree(vc->vc_screenbuf);
1053 vc_cons[currcons].d = NULL;
1062 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1063 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1064 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1066 #define decarm VC_REPEAT
1067 #define decckm VC_CKMODE
1068 #define kbdapplic VC_APPLIC
1072 * this is what the terminal answers to a ESC-Z or csi0c query.
1074 #define VT100ID "\033[?1;2c"
1075 #define VT102ID "\033[?6c"
1077 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1078 8,12,10,14, 9,13,11,15 };
1080 /* the default colour table, for VGA+ colour systems */
1081 unsigned char default_red[] = {
1082 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1083 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1085 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1087 unsigned char default_grn[] = {
1088 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1089 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1091 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1093 unsigned char default_blu[] = {
1094 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1095 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1097 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1100 * gotoxy() must verify all boundaries, because the arguments
1101 * might also be negative. If the given position is out of
1102 * bounds, the cursor is placed at the nearest margin.
1104 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1111 if (new_x >= vc->vc_cols)
1112 vc->vc_x = vc->vc_cols - 1;
1119 max_y = vc->vc_bottom;
1122 max_y = vc->vc_rows;
1126 else if (new_y >= max_y)
1127 vc->vc_y = max_y - 1;
1130 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1131 vc->vc_need_wrap = 0;
1134 /* for absolute user moves, when decom is set */
1135 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1137 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1140 void scrollback(struct vc_data *vc)
1142 scrolldelta(-(vc->vc_rows / 2));
1145 void scrollfront(struct vc_data *vc, int lines)
1148 lines = vc->vc_rows / 2;
1152 static void lf(struct vc_data *vc)
1154 /* don't scroll if above bottom of scrolling region, or
1155 * if below scrolling region
1157 if (vc->vc_y + 1 == vc->vc_bottom)
1158 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1159 else if (vc->vc_y < vc->vc_rows - 1) {
1161 vc->vc_pos += vc->vc_size_row;
1163 vc->vc_need_wrap = 0;
1164 notify_write(vc, '\n');
1167 static void ri(struct vc_data *vc)
1169 /* don't scroll if below top of scrolling region, or
1170 * if above scrolling region
1172 if (vc->vc_y == vc->vc_top)
1173 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1174 else if (vc->vc_y > 0) {
1176 vc->vc_pos -= vc->vc_size_row;
1178 vc->vc_need_wrap = 0;
1181 static inline void cr(struct vc_data *vc)
1183 vc->vc_pos -= vc->vc_x << 1;
1184 vc->vc_need_wrap = vc->vc_x = 0;
1185 notify_write(vc, '\r');
1188 static inline void bs(struct vc_data *vc)
1193 vc->vc_need_wrap = 0;
1194 notify_write(vc, '\b');
1198 static inline void del(struct vc_data *vc)
1203 static void csi_J(struct vc_data *vc, int vpar)
1206 unsigned short * start;
1209 case 0: /* erase from cursor to end of display */
1210 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1211 start = (unsigned short *)vc->vc_pos;
1213 case 1: /* erase from start to cursor */
1214 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1215 start = (unsigned short *)vc->vc_origin;
1217 case 3: /* erase scroll-back buffer (and whole display) */
1218 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1219 vc->vc_screenbuf_size);
1220 flush_scrollback(vc);
1222 if (con_is_visible(vc))
1225 case 2: /* erase whole display */
1226 count = vc->vc_cols * vc->vc_rows;
1227 start = (unsigned short *)vc->vc_origin;
1232 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1233 if (con_should_update(vc))
1234 do_update_region(vc, (unsigned long) start, count);
1235 vc->vc_need_wrap = 0;
1238 static void csi_K(struct vc_data *vc, int vpar)
1241 unsigned short * start;
1244 case 0: /* erase from cursor to end of line */
1245 count = vc->vc_cols - vc->vc_x;
1246 start = (unsigned short *)vc->vc_pos;
1248 case 1: /* erase from start of line to cursor */
1249 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1250 count = vc->vc_x + 1;
1252 case 2: /* erase whole line */
1253 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1254 count = vc->vc_cols;
1259 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1260 vc->vc_need_wrap = 0;
1261 if (con_should_update(vc))
1262 do_update_region(vc, (unsigned long) start, count);
1265 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1271 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1273 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1274 if (con_should_update(vc))
1275 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1276 vc->vc_need_wrap = 0;
1279 static void default_attr(struct vc_data *vc)
1281 vc->vc_intensity = 1;
1283 vc->vc_underline = 0;
1286 vc->vc_color = vc->vc_def_color;
1289 struct rgb { u8 r; u8 g; u8 b; };
1291 static void rgb_from_256(int i, struct rgb *c)
1293 if (i < 8) { /* Standard colours. */
1294 c->r = i&1 ? 0xaa : 0x00;
1295 c->g = i&2 ? 0xaa : 0x00;
1296 c->b = i&4 ? 0xaa : 0x00;
1297 } else if (i < 16) {
1298 c->r = i&1 ? 0xff : 0x55;
1299 c->g = i&2 ? 0xff : 0x55;
1300 c->b = i&4 ? 0xff : 0x55;
1301 } else if (i < 232) { /* 6x6x6 colour cube. */
1302 c->r = (i - 16) / 36 * 85 / 2;
1303 c->g = (i - 16) / 6 % 6 * 85 / 2;
1304 c->b = (i - 16) % 6 * 85 / 2;
1305 } else /* Grayscale ramp. */
1306 c->r = c->g = c->b = i * 10 - 2312;
1309 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1311 u8 hue = 0, max = max3(c->r, c->g, c->b);
1320 if (hue == 7 && max <= 0x55) {
1322 vc->vc_intensity = 2;
1323 } else if (max > 0xaa)
1324 vc->vc_intensity = 2;
1326 vc->vc_intensity = 1;
1328 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1331 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1333 /* For backgrounds, err on the dark side. */
1334 vc->vc_color = (vc->vc_color & 0x0f)
1335 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1339 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1340 * and thus need to be detected and ignored by hand. Strictly speaking, that
1341 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1342 * no one produces such codes and almost no one accepts them.
1344 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1347 static int vc_t416_color(struct vc_data *vc, int i,
1348 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1353 if (i > vc->vc_npar)
1356 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1359 rgb_from_256(vc->vc_par[i], &c);
1360 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1362 c.r = vc->vc_par[i + 1];
1363 c.g = vc->vc_par[i + 2];
1364 c.b = vc->vc_par[i + 3];
1374 /* console_lock is held */
1375 static void csi_m(struct vc_data *vc)
1379 for (i = 0; i <= vc->vc_npar; i++)
1380 switch (vc->vc_par[i]) {
1381 case 0: /* all attributes off */
1385 vc->vc_intensity = 2;
1388 vc->vc_intensity = 0;
1395 * No console drivers support double underline, so
1396 * convert it to a single underline.
1399 vc->vc_underline = 1;
1407 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1408 * Select primary font, don't display control chars if
1409 * defined, don't set bit 8 on output.
1411 vc->vc_translate = set_translate(vc->vc_charset == 0
1413 : vc->vc_G1_charset, vc);
1414 vc->vc_disp_ctrl = 0;
1415 vc->vc_toggle_meta = 0;
1417 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1418 * Select first alternate font, lets chars < 32 be
1419 * displayed as ROM chars.
1421 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1422 vc->vc_disp_ctrl = 1;
1423 vc->vc_toggle_meta = 0;
1425 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1426 * Select second alternate font, toggle high bit
1427 * before displaying as ROM char.
1429 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1430 vc->vc_disp_ctrl = 1;
1431 vc->vc_toggle_meta = 1;
1434 vc->vc_intensity = 1;
1440 vc->vc_underline = 0;
1449 i = vc_t416_color(vc, i, rgb_foreground);
1452 i = vc_t416_color(vc, i, rgb_background);
1455 vc->vc_color = (vc->vc_def_color & 0x0f) |
1456 (vc->vc_color & 0xf0);
1459 vc->vc_color = (vc->vc_def_color & 0xf0) |
1460 (vc->vc_color & 0x0f);
1463 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1464 if (vc->vc_par[i] < 100)
1465 vc->vc_intensity = 2;
1466 vc->vc_par[i] -= 60;
1468 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1469 vc->vc_color = color_table[vc->vc_par[i] - 30]
1470 | (vc->vc_color & 0xf0);
1471 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1472 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1473 | (vc->vc_color & 0x0f);
1479 static void respond_string(const char *p, struct tty_port *port)
1482 tty_insert_flip_char(port, *p, 0);
1485 tty_flip_buffer_push(port);
1488 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1492 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1493 respond_string(buf, tty->port);
1496 static inline void status_report(struct tty_struct *tty)
1498 respond_string("\033[0n", tty->port); /* Terminal ok */
1501 static inline void respond_ID(struct tty_struct *tty)
1503 respond_string(VT102ID, tty->port);
1506 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1510 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1512 respond_string(buf, tty->port);
1515 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1516 int mouse_reporting(void)
1518 return vc_cons[fg_console].d->vc_report_mouse;
1521 /* console_lock is held */
1522 static void set_mode(struct vc_data *vc, int on_off)
1526 for (i = 0; i <= vc->vc_npar; i++)
1528 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1529 case 1: /* Cursor keys send ^[Ox/^[[x */
1531 set_kbd(vc, decckm);
1533 clr_kbd(vc, decckm);
1535 case 3: /* 80/132 mode switch unimplemented */
1537 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1538 /* this alone does not suffice; some user mode
1539 utility has to change the hardware regs */
1542 case 5: /* Inverted screen on/off */
1543 if (vc->vc_decscnm != on_off) {
1544 vc->vc_decscnm = on_off;
1545 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1549 case 6: /* Origin relative/absolute */
1550 vc->vc_decom = on_off;
1553 case 7: /* Autowrap on/off */
1554 vc->vc_decawm = on_off;
1556 case 8: /* Autorepeat on/off */
1558 set_kbd(vc, decarm);
1560 clr_kbd(vc, decarm);
1563 vc->vc_report_mouse = on_off ? 1 : 0;
1565 case 25: /* Cursor on/off */
1566 vc->vc_deccm = on_off;
1569 vc->vc_report_mouse = on_off ? 2 : 0;
1573 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1574 case 3: /* Monitor (display ctrls) */
1575 vc->vc_disp_ctrl = on_off;
1577 case 4: /* Insert Mode on/off */
1578 vc->vc_decim = on_off;
1580 case 20: /* Lf, Enter == CrLf/Lf */
1590 /* console_lock is held */
1591 static void setterm_command(struct vc_data *vc)
1593 switch(vc->vc_par[0]) {
1594 case 1: /* set color for underline mode */
1595 if (vc->vc_can_do_color &&
1596 vc->vc_par[1] < 16) {
1597 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1598 if (vc->vc_underline)
1602 case 2: /* set color for half intensity mode */
1603 if (vc->vc_can_do_color &&
1604 vc->vc_par[1] < 16) {
1605 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1606 if (vc->vc_intensity == 0)
1610 case 8: /* store colors as defaults */
1611 vc->vc_def_color = vc->vc_attr;
1612 if (vc->vc_hi_font_mask == 0x100)
1613 vc->vc_def_color >>= 1;
1617 case 9: /* set blanking interval */
1618 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1619 poke_blanked_console();
1621 case 10: /* set bell frequency in Hz */
1622 if (vc->vc_npar >= 1)
1623 vc->vc_bell_pitch = vc->vc_par[1];
1625 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1627 case 11: /* set bell duration in msec */
1628 if (vc->vc_npar >= 1)
1629 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1630 msecs_to_jiffies(vc->vc_par[1]) : 0;
1632 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1634 case 12: /* bring specified console to the front */
1635 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1636 set_console(vc->vc_par[1] - 1);
1638 case 13: /* unblank the screen */
1639 poke_blanked_console();
1641 case 14: /* set vesa powerdown interval */
1642 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1644 case 15: /* activate the previous console */
1645 set_console(last_console);
1647 case 16: /* set cursor blink duration in msec */
1648 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1649 vc->vc_par[1] <= USHRT_MAX)
1650 vc->vc_cur_blink_ms = vc->vc_par[1];
1652 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1657 /* console_lock is held */
1658 static void csi_at(struct vc_data *vc, unsigned int nr)
1660 if (nr > vc->vc_cols - vc->vc_x)
1661 nr = vc->vc_cols - vc->vc_x;
1664 insert_char(vc, nr);
1667 /* console_lock is held */
1668 static void csi_L(struct vc_data *vc, unsigned int nr)
1670 if (nr > vc->vc_rows - vc->vc_y)
1671 nr = vc->vc_rows - vc->vc_y;
1674 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1675 vc->vc_need_wrap = 0;
1678 /* console_lock is held */
1679 static void csi_P(struct vc_data *vc, unsigned int nr)
1681 if (nr > vc->vc_cols - vc->vc_x)
1682 nr = vc->vc_cols - vc->vc_x;
1685 delete_char(vc, nr);
1688 /* console_lock is held */
1689 static void csi_M(struct vc_data *vc, unsigned int nr)
1691 if (nr > vc->vc_rows - vc->vc_y)
1692 nr = vc->vc_rows - vc->vc_y;
1695 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1696 vc->vc_need_wrap = 0;
1699 /* console_lock is held (except via vc_init->reset_terminal */
1700 static void save_cur(struct vc_data *vc)
1702 vc->vc_saved_x = vc->vc_x;
1703 vc->vc_saved_y = vc->vc_y;
1704 vc->vc_s_intensity = vc->vc_intensity;
1705 vc->vc_s_italic = vc->vc_italic;
1706 vc->vc_s_underline = vc->vc_underline;
1707 vc->vc_s_blink = vc->vc_blink;
1708 vc->vc_s_reverse = vc->vc_reverse;
1709 vc->vc_s_charset = vc->vc_charset;
1710 vc->vc_s_color = vc->vc_color;
1711 vc->vc_saved_G0 = vc->vc_G0_charset;
1712 vc->vc_saved_G1 = vc->vc_G1_charset;
1715 /* console_lock is held */
1716 static void restore_cur(struct vc_data *vc)
1718 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1719 vc->vc_intensity = vc->vc_s_intensity;
1720 vc->vc_italic = vc->vc_s_italic;
1721 vc->vc_underline = vc->vc_s_underline;
1722 vc->vc_blink = vc->vc_s_blink;
1723 vc->vc_reverse = vc->vc_s_reverse;
1724 vc->vc_charset = vc->vc_s_charset;
1725 vc->vc_color = vc->vc_s_color;
1726 vc->vc_G0_charset = vc->vc_saved_G0;
1727 vc->vc_G1_charset = vc->vc_saved_G1;
1728 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1730 vc->vc_need_wrap = 0;
1733 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1734 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1737 /* console_lock is held (except via vc_init()) */
1738 static void reset_terminal(struct vc_data *vc, int do_clear)
1741 vc->vc_bottom = vc->vc_rows;
1742 vc->vc_state = ESnormal;
1744 vc->vc_translate = set_translate(LAT1_MAP, vc);
1745 vc->vc_G0_charset = LAT1_MAP;
1746 vc->vc_G1_charset = GRAF_MAP;
1748 vc->vc_need_wrap = 0;
1749 vc->vc_report_mouse = 0;
1750 vc->vc_utf = default_utf8;
1751 vc->vc_utf_count = 0;
1753 vc->vc_disp_ctrl = 0;
1754 vc->vc_toggle_meta = 0;
1759 vc->vc_deccm = global_cursor_default;
1762 vt_reset_keyboard(vc->vc_num);
1764 vc->vc_cursor_type = cur_default;
1765 vc->vc_complement_mask = vc->vc_s_complement_mask;
1770 vc->vc_tab_stop[0] =
1771 vc->vc_tab_stop[1] =
1772 vc->vc_tab_stop[2] =
1773 vc->vc_tab_stop[3] =
1774 vc->vc_tab_stop[4] =
1775 vc->vc_tab_stop[5] =
1776 vc->vc_tab_stop[6] =
1777 vc->vc_tab_stop[7] = 0x01010101;
1779 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1780 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1781 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1789 /* console_lock is held */
1790 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1793 * Control characters can be used in the _middle_
1794 * of an escape sequence.
1796 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1802 if (vc->vc_state == ESosc)
1803 vc->vc_state = ESnormal;
1804 else if (vc->vc_bell_duration)
1805 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1811 vc->vc_pos -= (vc->vc_x << 1);
1812 while (vc->vc_x < vc->vc_cols - 1) {
1814 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1817 vc->vc_pos += (vc->vc_x << 1);
1818 notify_write(vc, '\t');
1820 case 10: case 11: case 12:
1822 if (!is_kbd(vc, lnm))
1829 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1830 vc->vc_disp_ctrl = 1;
1834 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1835 vc->vc_disp_ctrl = 0;
1838 vc->vc_state = ESnormal;
1841 vc->vc_state = ESesc;
1847 vc->vc_state = ESsquare;
1850 switch(vc->vc_state) {
1852 vc->vc_state = ESnormal;
1855 vc->vc_state = ESsquare;
1858 vc->vc_state = ESnonstd;
1861 vc->vc_state = ESpercent;
1874 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1886 vc->vc_state = ESsetG0;
1889 vc->vc_state = ESsetG1;
1892 vc->vc_state = EShash;
1895 reset_terminal(vc, 1);
1897 case '>': /* Numeric keypad */
1898 clr_kbd(vc, kbdapplic);
1900 case '=': /* Appl. keypad */
1901 set_kbd(vc, kbdapplic);
1906 if (c=='P') { /* palette escape sequence */
1907 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1908 vc->vc_par[vc->vc_npar] = 0;
1910 vc->vc_state = ESpalette;
1912 } else if (c=='R') { /* reset palette */
1914 vc->vc_state = ESnormal;
1915 } else if (c>='0' && c<='9')
1916 vc->vc_state = ESosc;
1918 vc->vc_state = ESnormal;
1922 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1923 if (vc->vc_npar == 7) {
1924 int i = vc->vc_par[0] * 3, j = 1;
1925 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1926 vc->vc_palette[i++] += vc->vc_par[j++];
1927 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1928 vc->vc_palette[i++] += vc->vc_par[j++];
1929 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1930 vc->vc_palette[i] += vc->vc_par[j];
1932 vc->vc_state = ESnormal;
1935 vc->vc_state = ESnormal;
1938 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1939 vc->vc_par[vc->vc_npar] = 0;
1941 vc->vc_state = ESgetpars;
1942 if (c == '[') { /* Function key */
1943 vc->vc_state=ESfunckey;
1946 vc->vc_ques = (c == '?');
1950 if (c == ';' && vc->vc_npar < NPAR - 1) {
1953 } else if (c>='0' && c<='9') {
1954 vc->vc_par[vc->vc_npar] *= 10;
1955 vc->vc_par[vc->vc_npar] += c - '0';
1958 vc->vc_state = ESnormal;
1969 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1971 vc->vc_cursor_type = cur_default;
1979 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1981 vc->vc_complement_mask = vc->vc_s_complement_mask;
1987 if (vc->vc_par[0] == 5)
1989 else if (vc->vc_par[0] == 6)
1990 cursor_report(vc, tty);
2002 gotoxy(vc, vc->vc_par[0], vc->vc_y);
2007 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2012 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2017 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2022 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2027 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2032 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2037 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2044 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2047 csi_J(vc, vc->vc_par[0]);
2050 csi_K(vc, vc->vc_par[0]);
2053 csi_L(vc, vc->vc_par[0]);
2056 csi_M(vc, vc->vc_par[0]);
2059 csi_P(vc, vc->vc_par[0]);
2067 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2068 else if (vc->vc_par[0] == 3) {
2069 vc->vc_tab_stop[0] =
2070 vc->vc_tab_stop[1] =
2071 vc->vc_tab_stop[2] =
2072 vc->vc_tab_stop[3] =
2073 vc->vc_tab_stop[4] =
2074 vc->vc_tab_stop[5] =
2075 vc->vc_tab_stop[6] =
2076 vc->vc_tab_stop[7] = 0;
2082 case 'q': /* DECLL - but only 3 leds */
2083 /* map 0,1,2,3 to 0,1,2,4 */
2084 if (vc->vc_par[0] < 4)
2085 vt_set_led_state(vc->vc_num,
2086 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2092 vc->vc_par[1] = vc->vc_rows;
2093 /* Minimum allowed region is 2 lines */
2094 if (vc->vc_par[0] < vc->vc_par[1] &&
2095 vc->vc_par[1] <= vc->vc_rows) {
2096 vc->vc_top = vc->vc_par[0] - 1;
2097 vc->vc_bottom = vc->vc_par[1];
2108 csi_X(vc, vc->vc_par[0]);
2111 csi_at(vc, vc->vc_par[0]);
2113 case ']': /* setterm functions */
2114 setterm_command(vc);
2119 vc->vc_state = ESnormal;
2121 case '@': /* defined in ISO 2022 */
2124 case 'G': /* prelim official escape code */
2125 case '8': /* retained for compatibility */
2131 vc->vc_state = ESnormal;
2134 vc->vc_state = ESnormal;
2136 /* DEC screen alignment test. kludge :-) */
2137 vc->vc_video_erase_char =
2138 (vc->vc_video_erase_char & 0xff00) | 'E';
2140 vc->vc_video_erase_char =
2141 (vc->vc_video_erase_char & 0xff00) | ' ';
2142 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2147 vc->vc_G0_charset = GRAF_MAP;
2149 vc->vc_G0_charset = LAT1_MAP;
2151 vc->vc_G0_charset = IBMPC_MAP;
2153 vc->vc_G0_charset = USER_MAP;
2154 if (vc->vc_charset == 0)
2155 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2156 vc->vc_state = ESnormal;
2160 vc->vc_G1_charset = GRAF_MAP;
2162 vc->vc_G1_charset = LAT1_MAP;
2164 vc->vc_G1_charset = IBMPC_MAP;
2166 vc->vc_G1_charset = USER_MAP;
2167 if (vc->vc_charset == 1)
2168 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2169 vc->vc_state = ESnormal;
2174 vc->vc_state = ESnormal;
2178 /* is_double_width() is based on the wcwidth() implementation by
2179 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2180 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2187 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2192 if (ucs < table[0].first || ucs > table[max].last)
2194 while (max >= min) {
2195 mid = (min + max) / 2;
2196 if (ucs > table[mid].last)
2198 else if (ucs < table[mid].first)
2206 static int is_double_width(uint32_t ucs)
2208 static const struct interval double_width[] = {
2209 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2210 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2211 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2212 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2214 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2217 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2218 unsigned long draw_to, int *draw_x)
2223 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2224 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2228 /* acquires console_lock */
2229 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2231 int c, tc, ok, n = 0, draw_x = -1;
2232 unsigned int currcons;
2233 unsigned long draw_from = 0, draw_to = 0;
2235 unsigned char vc_attr;
2236 struct vt_notifier_param param;
2240 u16 himask, charmask;
2248 vc = tty->driver_data;
2250 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2255 currcons = vc->vc_num;
2256 if (!vc_cons_allocated(currcons)) {
2257 /* could this happen? */
2258 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2263 himask = vc->vc_hi_font_mask;
2264 charmask = himask ? 0x1ff : 0xff;
2266 /* undraw cursor first */
2272 while (!tty->stopped && count) {
2282 /* Do no translation at all in control states */
2283 if (vc->vc_state != ESnormal) {
2285 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2286 /* Combine UTF-8 into Unicode in vc_utf_char.
2287 * vc_utf_count is the number of continuation bytes still
2288 * expected to arrive.
2289 * vc_npar is the number of continuation bytes arrived so
2293 if ((c & 0xc0) == 0x80) {
2294 /* Continuation byte received */
2295 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2296 if (vc->vc_utf_count) {
2297 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2299 if (--vc->vc_utf_count) {
2300 /* Still need some bytes */
2303 /* Got a whole character */
2304 c = vc->vc_utf_char;
2305 /* Reject overlong sequences */
2306 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2307 c > utf8_length_changes[vc->vc_npar])
2310 /* Unexpected continuation byte */
2311 vc->vc_utf_count = 0;
2315 /* Single ASCII byte or first byte of a sequence received */
2316 if (vc->vc_utf_count) {
2317 /* Continuation byte expected */
2319 vc->vc_utf_count = 0;
2321 } else if (c > 0x7f) {
2322 /* First byte of a multibyte sequence received */
2324 if ((c & 0xe0) == 0xc0) {
2325 vc->vc_utf_count = 1;
2326 vc->vc_utf_char = (c & 0x1f);
2327 } else if ((c & 0xf0) == 0xe0) {
2328 vc->vc_utf_count = 2;
2329 vc->vc_utf_char = (c & 0x0f);
2330 } else if ((c & 0xf8) == 0xf0) {
2331 vc->vc_utf_count = 3;
2332 vc->vc_utf_char = (c & 0x07);
2333 } else if ((c & 0xfc) == 0xf8) {
2334 vc->vc_utf_count = 4;
2335 vc->vc_utf_char = (c & 0x03);
2336 } else if ((c & 0xfe) == 0xfc) {
2337 vc->vc_utf_count = 5;
2338 vc->vc_utf_char = (c & 0x01);
2340 /* 254 and 255 are invalid */
2343 if (vc->vc_utf_count) {
2344 /* Still need some bytes */
2348 /* Nothing to do if an ASCII byte was received */
2350 /* End of UTF-8 decoding. */
2351 /* c is the received character, or U+FFFD for invalid sequences. */
2352 /* Replace invalid Unicode code points with U+FFFD too */
2353 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2356 } else { /* no utf or alternate charset mode */
2357 tc = vc_translate(vc, c);
2361 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2362 ¶m) == NOTIFY_STOP)
2365 /* If the original code was a control character we
2366 * only allow a glyph to be displayed if the code is
2367 * not normally used (such as for cursor movement) or
2368 * if the disp_ctrl mode has been explicitly enabled.
2369 * Certain characters (as given by the CTRL_ALWAYS
2370 * bitmap) are always displayed as control characters,
2371 * as the console would be pretty useless without
2372 * them; to display an arbitrary font position use the
2373 * direct-to-font zone in UTF-8 mode.
2375 ok = tc && (c >= 32 ||
2376 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2377 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2378 && (c != 127 || vc->vc_disp_ctrl)
2381 if (vc->vc_state == ESnormal && ok) {
2382 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2383 if (is_double_width(c))
2386 /* Now try to find out how to display it */
2387 tc = conv_uni_to_pc(vc, tc);
2388 if (tc & ~charmask) {
2389 if (tc == -1 || tc == -2) {
2390 continue; /* nothing to display */
2392 /* Glyph not found */
2393 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2394 /* In legacy mode use the glyph we get by a 1:1 mapping.
2395 This would make absolutely no sense with Unicode in mind,
2396 but do this for ASCII characters since a font may lack
2397 Unicode mapping info and we don't want to end up with
2398 having question marks only. */
2401 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2402 tc = conv_uni_to_pc(vc, 0xfffd);
2405 tc = conv_uni_to_pc(vc, '?');
2406 if (tc < 0) tc = '?';
2412 vc_attr = vc->vc_attr;
2414 /* invert vc_attr */
2415 if (!vc->vc_can_do_color) {
2416 vc_attr = (vc->vc_attr) ^ 0x08;
2417 } else if (vc->vc_hi_font_mask == 0x100) {
2418 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2420 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2422 con_flush(vc, draw_from, draw_to, &draw_x);
2426 if (vc->vc_need_wrap || vc->vc_decim)
2427 con_flush(vc, draw_from, draw_to,
2429 if (vc->vc_need_wrap) {
2436 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2437 (vc_attr << 8) + tc,
2438 (u16 *) vc->vc_pos);
2439 if (con_should_update(vc) && draw_x < 0) {
2441 draw_from = vc->vc_pos;
2443 if (vc->vc_x == vc->vc_cols - 1) {
2444 vc->vc_need_wrap = vc->vc_decawm;
2445 draw_to = vc->vc_pos + 2;
2448 draw_to = (vc->vc_pos += 2);
2451 if (!--width) break;
2453 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2454 if (tc < 0) tc = ' ';
2456 notify_write(vc, c);
2459 con_flush(vc, draw_from, draw_to, &draw_x);
2466 goto rescan_last_byte;
2470 con_flush(vc, draw_from, draw_to, &draw_x);
2471 do_con_trol(tty, vc, orig);
2473 con_flush(vc, draw_from, draw_to, &draw_x);
2474 console_conditional_schedule();
2481 * This is the console switching callback.
2483 * Doing console switching in a process context allows
2484 * us to do the switches asynchronously (needed when we want
2485 * to switch due to a keyboard interrupt). Synchronization
2486 * with other console code and prevention of re-entrancy is
2487 * ensured with console_lock.
2489 static void console_callback(struct work_struct *ignored)
2493 if (want_console >= 0) {
2494 if (want_console != fg_console &&
2495 vc_cons_allocated(want_console)) {
2496 hide_cursor(vc_cons[fg_console].d);
2497 change_console(vc_cons[want_console].d);
2498 /* we only changed when the console had already
2499 been allocated - a new console is not created
2500 in an interrupt routine */
2504 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2505 do_poke_blanked_console = 0;
2506 poke_blanked_console();
2508 if (scrollback_delta) {
2509 struct vc_data *vc = vc_cons[fg_console].d;
2511 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2512 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2513 scrollback_delta = 0;
2515 if (blank_timer_expired) {
2517 blank_timer_expired = 0;
2519 notify_update(vc_cons[fg_console].d);
2524 int set_console(int nr)
2526 struct vc_data *vc = vc_cons[fg_console].d;
2528 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2529 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2532 * Console switch will fail in console_callback() or
2533 * change_console() so there is no point scheduling
2536 * Existing set_console() users don't check the return
2537 * value so this shouldn't break anything
2543 schedule_console_callback();
2548 struct tty_driver *console_driver;
2550 #ifdef CONFIG_VT_CONSOLE
2553 * vt_kmsg_redirect() - Sets/gets the kernel message console
2554 * @new: The new virtual terminal number or -1 if the console should stay
2557 * By default, the kernel messages are always printed on the current virtual
2558 * console. However, the user may modify that default with the
2559 * TIOCL_SETKMSGREDIRECT ioctl call.
2561 * This function sets the kernel message console to be @new. It returns the old
2562 * virtual console number. The virtual terminal number 0 (both as parameter and
2563 * return value) means no redirection (i.e. always printed on the currently
2566 * The parameter -1 means that only the current console is returned, but the
2567 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2568 * case to make the code more understandable.
2570 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2571 * the parameter and always returns 0.
2573 int vt_kmsg_redirect(int new)
2575 static int kmsg_con;
2578 return xchg(&kmsg_con, new);
2584 * Console on virtual terminal
2586 * The console must be locked when we get here.
2589 static void vt_console_print(struct console *co, const char *b, unsigned count)
2591 struct vc_data *vc = vc_cons[fg_console].d;
2593 static DEFINE_SPINLOCK(printing_lock);
2594 const ushort *start;
2599 /* console busy or not yet initialized */
2602 if (!spin_trylock(&printing_lock))
2605 kmsg_console = vt_get_kmsg_redirect();
2606 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2607 vc = vc_cons[kmsg_console - 1].d;
2609 /* read `x' only after setting currcons properly (otherwise
2610 the `x' macro will read the x of the foreground console). */
2613 if (!vc_cons_allocated(fg_console)) {
2615 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2619 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2622 /* undraw cursor first */
2626 start = (ushort *)vc->vc_pos;
2628 /* Contrived structure to try to emulate original need_wrap behaviour
2629 * Problems caused when we have need_wrap set on '\n' character */
2632 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2634 if (con_is_visible(vc))
2635 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2637 if (vc->vc_need_wrap)
2641 if (c == 8) { /* backspace */
2643 start = (ushort *)vc->vc_pos;
2650 start = (ushort *)vc->vc_pos;
2652 if (c == 10 || c == 13)
2655 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2656 notify_write(vc, c);
2658 if (myx == vc->vc_cols - 1) {
2659 vc->vc_need_wrap = 1;
2666 if (con_is_visible(vc))
2667 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2669 if (vc->vc_x == vc->vc_cols) {
2671 vc->vc_need_wrap = 1;
2678 spin_unlock(&printing_lock);
2681 static struct tty_driver *vt_console_device(struct console *c, int *index)
2683 *index = c->index ? c->index-1 : fg_console;
2684 return console_driver;
2687 static struct console vt_console_driver = {
2689 .write = vt_console_print,
2690 .device = vt_console_device,
2691 .unblank = unblank_screen,
2692 .flags = CON_PRINTBUFFER,
2698 * Handling of Linux-specific VC ioctls
2702 * Generally a bit racy with respect to console_lock();.
2704 * There are some functions which don't need it.
2706 * There are some functions which can sleep for arbitrary periods
2707 * (paste_selection) but we don't need the lock there anyway.
2709 * set_selection has locking, and definitely needs it
2712 int tioclinux(struct tty_struct *tty, unsigned long arg)
2715 char __user *p = (char __user *)arg;
2719 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2721 if (get_user(type, p))
2728 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2730 case TIOCL_PASTESEL:
2731 ret = paste_selection(tty);
2733 case TIOCL_UNBLANKSCREEN:
2738 case TIOCL_SELLOADLUT:
2740 ret = sel_loadlut(p);
2743 case TIOCL_GETSHIFTSTATE:
2746 * Make it possible to react to Shift+Mousebutton.
2747 * Note that 'shift_state' is an undocumented
2748 * kernel-internal variable; programs not closely
2749 * related to the kernel should not use this.
2751 data = vt_get_shift_state();
2752 ret = put_user(data, p);
2754 case TIOCL_GETMOUSEREPORTING:
2755 console_lock(); /* May be overkill */
2756 data = mouse_reporting();
2758 ret = put_user(data, p);
2760 case TIOCL_SETVESABLANK:
2762 ret = set_vesa_blanking(p);
2765 case TIOCL_GETKMSGREDIRECT:
2766 data = vt_get_kmsg_redirect();
2767 ret = put_user(data, p);
2769 case TIOCL_SETKMSGREDIRECT:
2770 if (!capable(CAP_SYS_ADMIN)) {
2773 if (get_user(data, p+1))
2776 vt_kmsg_redirect(data);
2779 case TIOCL_GETFGCONSOLE:
2780 /* No locking needed as this is a transiently
2781 correct return anyway if the caller hasn't
2782 disabled switching */
2785 case TIOCL_SCROLLCONSOLE:
2786 if (get_user(lines, (s32 __user *)(p+4))) {
2789 /* Need the console lock here. Note that lots
2790 of other calls need fixing before the lock
2791 is actually useful ! */
2793 scrollfront(vc_cons[fg_console].d, lines);
2798 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2804 case TIOCL_BLANKEDSCREEN:
2805 ret = console_blanked;
2815 * /dev/ttyN handling
2818 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2822 retval = do_con_write(tty, buf, count);
2823 con_flush_chars(tty);
2828 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2831 return 0; /* n_r3964 calls put_char() from interrupt context */
2832 return do_con_write(tty, &ch, 1);
2835 static int con_write_room(struct tty_struct *tty)
2839 return 32768; /* No limit, really; we're not buffering */
2842 static int con_chars_in_buffer(struct tty_struct *tty)
2844 return 0; /* we're not buffering */
2848 * con_throttle and con_unthrottle are only used for
2849 * paste_selection(), which has to stuff in a large number of
2852 static void con_throttle(struct tty_struct *tty)
2856 static void con_unthrottle(struct tty_struct *tty)
2858 struct vc_data *vc = tty->driver_data;
2860 wake_up_interruptible(&vc->paste_wait);
2864 * Turn the Scroll-Lock LED on when the tty is stopped
2866 static void con_stop(struct tty_struct *tty)
2871 console_num = tty->index;
2872 if (!vc_cons_allocated(console_num))
2874 vt_kbd_con_stop(console_num);
2878 * Turn the Scroll-Lock LED off when the console is started
2880 static void con_start(struct tty_struct *tty)
2885 console_num = tty->index;
2886 if (!vc_cons_allocated(console_num))
2888 vt_kbd_con_start(console_num);
2891 static void con_flush_chars(struct tty_struct *tty)
2895 if (in_interrupt()) /* from flush_to_ldisc */
2898 /* if we race with con_close(), vt may be null */
2900 vc = tty->driver_data;
2907 * Allocate the console screen memory.
2909 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2911 unsigned int currcons = tty->index;
2916 ret = vc_allocate(currcons);
2920 vc = vc_cons[currcons].d;
2922 /* Still being freed */
2928 ret = tty_port_install(&vc->port, driver, tty);
2932 tty->driver_data = vc;
2934 tty_port_get(&vc->port);
2936 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2937 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2938 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2941 tty->termios.c_iflag |= IUTF8;
2943 tty->termios.c_iflag &= ~IUTF8;
2949 static int con_open(struct tty_struct *tty, struct file *filp)
2951 /* everything done in install */
2956 static void con_close(struct tty_struct *tty, struct file *filp)
2958 /* Nothing to do - we defer to shutdown */
2961 static void con_shutdown(struct tty_struct *tty)
2963 struct vc_data *vc = tty->driver_data;
2966 vc->port.tty = NULL;
2970 static void con_cleanup(struct tty_struct *tty)
2972 struct vc_data *vc = tty->driver_data;
2974 tty_port_put(&vc->port);
2977 static int default_color = 7; /* white */
2978 static int default_italic_color = 2; // green (ASCII)
2979 static int default_underline_color = 3; // cyan (ASCII)
2980 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2981 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2982 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2984 static void vc_init(struct vc_data *vc, unsigned int rows,
2985 unsigned int cols, int do_clear)
2991 vc->vc_size_row = cols << 1;
2992 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2995 vc->vc_pos = vc->vc_origin;
2997 for (j=k=0; j<16; j++) {
2998 vc->vc_palette[k++] = default_red[j] ;
2999 vc->vc_palette[k++] = default_grn[j] ;
3000 vc->vc_palette[k++] = default_blu[j] ;
3002 vc->vc_def_color = default_color;
3003 vc->vc_ulcolor = default_underline_color;
3004 vc->vc_itcolor = default_italic_color;
3005 vc->vc_halfcolor = 0x08; /* grey */
3006 init_waitqueue_head(&vc->paste_wait);
3007 reset_terminal(vc, do_clear);
3011 * This routine initializes console interrupts, and does nothing
3012 * else. If you want the screen to clear, call tty_write with
3013 * the appropriate escape-sequence.
3016 static int __init con_init(void)
3018 const char *display_desc = NULL;
3020 unsigned int currcons = 0, i;
3025 display_desc = conswitchp->con_startup();
3026 if (!display_desc) {
3032 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3033 struct con_driver *con_driver = ®istered_con_driver[i];
3035 if (con_driver->con == NULL) {
3036 con_driver->con = conswitchp;
3037 con_driver->desc = display_desc;
3038 con_driver->flag = CON_DRIVER_FLAG_INIT;
3039 con_driver->first = 0;
3040 con_driver->last = MAX_NR_CONSOLES - 1;
3045 for (i = 0; i < MAX_NR_CONSOLES; i++)
3046 con_driver_map[i] = conswitchp;
3048 if (blankinterval) {
3049 blank_state = blank_normal_wait;
3050 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3053 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3054 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3055 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3056 tty_port_init(&vc->port);
3057 visual_init(vc, currcons, 1);
3058 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3059 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3060 vc_init(vc, vc->vc_rows, vc->vc_cols,
3061 currcons || !vc->vc_sw->con_save_screen);
3063 currcons = fg_console = 0;
3064 master_display_fg = vc = vc_cons[currcons].d;
3067 gotoxy(vc, vc->vc_x, vc->vc_y);
3070 pr_info("Console: %s %s %dx%d\n",
3071 vc->vc_can_do_color ? "colour" : "mono",
3072 display_desc, vc->vc_cols, vc->vc_rows);
3077 #ifdef CONFIG_VT_CONSOLE
3078 register_console(&vt_console_driver);
3082 console_initcall(con_init);
3084 static const struct tty_operations con_ops = {
3085 .install = con_install,
3089 .write_room = con_write_room,
3090 .put_char = con_put_char,
3091 .flush_chars = con_flush_chars,
3092 .chars_in_buffer = con_chars_in_buffer,
3094 #ifdef CONFIG_COMPAT
3095 .compat_ioctl = vt_compat_ioctl,
3099 .throttle = con_throttle,
3100 .unthrottle = con_unthrottle,
3101 .resize = vt_resize,
3102 .shutdown = con_shutdown,
3103 .cleanup = con_cleanup,
3106 static struct cdev vc0_cdev;
3108 static ssize_t show_tty_active(struct device *dev,
3109 struct device_attribute *attr, char *buf)
3111 return sprintf(buf, "tty%d\n", fg_console + 1);
3113 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3115 static struct attribute *vt_dev_attrs[] = {
3116 &dev_attr_active.attr,
3120 ATTRIBUTE_GROUPS(vt_dev);
3122 int __init vty_init(const struct file_operations *console_fops)
3124 cdev_init(&vc0_cdev, console_fops);
3125 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3126 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3127 panic("Couldn't register /dev/tty0 driver\n");
3128 tty0dev = device_create_with_groups(tty_class, NULL,
3129 MKDEV(TTY_MAJOR, 0), NULL,
3130 vt_dev_groups, "tty0");
3131 if (IS_ERR(tty0dev))
3136 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3137 if (!console_driver)
3138 panic("Couldn't allocate console driver\n");
3140 console_driver->name = "tty";
3141 console_driver->name_base = 1;
3142 console_driver->major = TTY_MAJOR;
3143 console_driver->minor_start = 1;
3144 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3145 console_driver->init_termios = tty_std_termios;
3147 console_driver->init_termios.c_iflag |= IUTF8;
3148 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3149 tty_set_operations(console_driver, &con_ops);
3150 if (tty_register_driver(console_driver))
3151 panic("Couldn't register console driver\n");
3154 #ifdef CONFIG_MDA_CONSOLE
3160 #ifndef VT_SINGLE_DRIVER
3162 static struct class *vtconsole_class;
3164 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3167 struct module *owner = csw->owner;
3168 const char *desc = NULL;
3169 struct con_driver *con_driver;
3170 int i, j = -1, k = -1, retval = -ENODEV;
3172 if (!try_module_get(owner))
3175 WARN_CONSOLE_UNLOCKED();
3177 /* check if driver is registered */
3178 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3179 con_driver = ®istered_con_driver[i];
3181 if (con_driver->con == csw) {
3182 desc = con_driver->desc;
3191 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3193 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3198 module_put(conswitchp->owner);
3200 __module_get(owner);
3204 first = max(first, con_driver->first);
3205 last = min(last, con_driver->last);
3207 for (i = first; i <= last; i++) {
3209 struct vc_data *vc = vc_cons[i].d;
3211 if (con_driver_map[i])
3212 module_put(con_driver_map[i]->owner);
3213 __module_get(owner);
3214 con_driver_map[i] = csw;
3216 if (!vc || !vc->vc_sw)
3221 if (con_is_visible(vc)) {
3226 old_was_color = vc->vc_can_do_color;
3227 vc->vc_sw->con_deinit(vc);
3228 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3229 visual_init(vc, i, 0);
3233 /* If the console changed between mono <-> color, then
3234 * the attributes in the screenbuf will be wrong. The
3235 * following resets all attributes to something sane.
3237 if (old_was_color != vc->vc_can_do_color)
3238 clear_buffer_attributes(vc);
3241 pr_info("Console: switching ");
3243 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
3245 struct vc_data *vc = vc_cons[j].d;
3247 printk(KERN_CONT "to %s %s %dx%d\n",
3248 vc->vc_can_do_color ? "colour" : "mono",
3249 desc, vc->vc_cols, vc->vc_rows);
3256 printk(KERN_CONT "to %s\n", desc);
3265 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3266 /* unlocked version of unbind_con_driver() */
3267 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3269 struct module *owner = csw->owner;
3270 const struct consw *defcsw = NULL;
3271 struct con_driver *con_driver = NULL, *con_back = NULL;
3272 int i, retval = -ENODEV;
3274 if (!try_module_get(owner))
3277 WARN_CONSOLE_UNLOCKED();
3279 /* check if driver is registered and if it is unbindable */
3280 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3281 con_driver = ®istered_con_driver[i];
3283 if (con_driver->con == csw &&
3284 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3295 /* check if backup driver exists */
3296 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3297 con_back = ®istered_con_driver[i];
3299 if (con_back->con && con_back->con != csw) {
3300 defcsw = con_back->con;
3309 if (!con_is_bound(csw))
3312 first = max(first, con_driver->first);
3313 last = min(last, con_driver->last);
3315 for (i = first; i <= last; i++) {
3316 if (con_driver_map[i] == csw) {
3317 module_put(csw->owner);
3318 con_driver_map[i] = NULL;
3322 if (!con_is_bound(defcsw)) {
3323 const struct consw *defconsw = conswitchp;
3325 defcsw->con_startup();
3326 con_back->flag |= CON_DRIVER_FLAG_INIT;
3328 * vgacon may change the default driver to point
3329 * to dummycon, we restore it here...
3331 conswitchp = defconsw;
3334 if (!con_is_bound(csw))
3335 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3337 /* ignore return value, binding should not fail */
3338 do_bind_con_driver(defcsw, first, last, deflt);
3344 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3346 static int vt_bind(struct con_driver *con)
3348 const struct consw *defcsw = NULL, *csw = NULL;
3349 int i, more = 1, first = -1, last = -1, deflt = 0;
3351 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3356 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3357 struct con_driver *con = ®istered_con_driver[i];
3359 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3371 for (i = con->first; i <= con->last; i++) {
3372 if (con_driver_map[i] == defcsw) {
3377 } else if (first != -1)
3381 if (first == 0 && last == MAX_NR_CONSOLES -1)
3385 do_bind_con_driver(csw, first, last, deflt);
3396 static int vt_unbind(struct con_driver *con)
3398 const struct consw *csw = NULL;
3399 int i, more = 1, first = -1, last = -1, deflt = 0;
3402 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3410 for (i = con->first; i <= con->last; i++) {
3411 if (con_driver_map[i] == csw) {
3416 } else if (first != -1)
3420 if (first == 0 && last == MAX_NR_CONSOLES -1)
3424 ret = do_unbind_con_driver(csw, first, last, deflt);
3438 static inline int vt_bind(struct con_driver *con)
3442 static inline int vt_unbind(struct con_driver *con)
3446 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3448 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3449 const char *buf, size_t count)
3451 struct con_driver *con = dev_get_drvdata(dev);
3452 int bind = simple_strtoul(buf, NULL, 0);
3466 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3469 struct con_driver *con = dev_get_drvdata(dev);
3470 int bind = con_is_bound(con->con);
3472 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3475 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3478 struct con_driver *con = dev_get_drvdata(dev);
3480 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3481 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3486 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3487 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3489 static struct attribute *con_dev_attrs[] = {
3490 &dev_attr_bind.attr,
3491 &dev_attr_name.attr,
3495 ATTRIBUTE_GROUPS(con_dev);
3497 static int vtconsole_init_device(struct con_driver *con)
3499 con->flag |= CON_DRIVER_FLAG_ATTR;
3503 static void vtconsole_deinit_device(struct con_driver *con)
3505 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3509 * con_is_bound - checks if driver is bound to the console
3510 * @csw: console driver
3512 * RETURNS: zero if unbound, nonzero if bound
3514 * Drivers can call this and if zero, they should release
3515 * all resources allocated on con_startup()
3517 int con_is_bound(const struct consw *csw)
3521 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3522 if (con_driver_map[i] == csw) {
3530 EXPORT_SYMBOL(con_is_bound);
3533 * con_debug_enter - prepare the console for the kernel debugger
3534 * @sw: console driver
3536 * Called when the console is taken over by the kernel debugger, this
3537 * function needs to save the current console state, then put the console
3538 * into a state suitable for the kernel debugger.
3541 * Zero on success, nonzero if a failure occurred when trying to prepare
3542 * the console for the debugger.
3544 int con_debug_enter(struct vc_data *vc)
3548 saved_fg_console = fg_console;
3549 saved_last_console = last_console;
3550 saved_want_console = want_console;
3551 saved_vc_mode = vc->vc_mode;
3552 saved_console_blanked = console_blanked;
3553 vc->vc_mode = KD_TEXT;
3554 console_blanked = 0;
3555 if (vc->vc_sw->con_debug_enter)
3556 ret = vc->vc_sw->con_debug_enter(vc);
3557 #ifdef CONFIG_KGDB_KDB
3558 /* Set the initial LINES variable if it is not already set */
3559 if (vc->vc_rows < 999) {
3562 const char *setargs[3] = {
3567 if (kdbgetintenv(setargs[0], &linecount)) {
3568 snprintf(lns, 4, "%i", vc->vc_rows);
3569 kdb_set(2, setargs);
3572 if (vc->vc_cols < 999) {
3575 const char *setargs[3] = {
3580 if (kdbgetintenv(setargs[0], &colcount)) {
3581 snprintf(cols, 4, "%i", vc->vc_cols);
3582 kdb_set(2, setargs);
3585 #endif /* CONFIG_KGDB_KDB */
3588 EXPORT_SYMBOL_GPL(con_debug_enter);
3591 * con_debug_leave - restore console state
3592 * @sw: console driver
3594 * Restore the console state to what it was before the kernel debugger
3598 * Zero on success, nonzero if a failure occurred when trying to restore
3601 int con_debug_leave(void)
3606 fg_console = saved_fg_console;
3607 last_console = saved_last_console;
3608 want_console = saved_want_console;
3609 console_blanked = saved_console_blanked;
3610 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3612 vc = vc_cons[fg_console].d;
3613 if (vc->vc_sw->con_debug_leave)
3614 ret = vc->vc_sw->con_debug_leave(vc);
3617 EXPORT_SYMBOL_GPL(con_debug_leave);
3619 static int do_register_con_driver(const struct consw *csw, int first, int last)
3621 struct module *owner = csw->owner;
3622 struct con_driver *con_driver;
3626 WARN_CONSOLE_UNLOCKED();
3628 if (!try_module_get(owner))
3631 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3632 con_driver = ®istered_con_driver[i];
3634 /* already registered */
3635 if (con_driver->con == csw) {
3641 desc = csw->con_startup();
3649 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3650 con_driver = ®istered_con_driver[i];
3652 if (con_driver->con == NULL &&
3653 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3654 con_driver->con = csw;
3655 con_driver->desc = desc;
3656 con_driver->node = i;
3657 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3658 CON_DRIVER_FLAG_INIT;
3659 con_driver->first = first;
3660 con_driver->last = last;
3670 device_create_with_groups(vtconsole_class, NULL,
3671 MKDEV(0, con_driver->node),
3672 con_driver, con_dev_groups,
3673 "vtcon%i", con_driver->node);
3674 if (IS_ERR(con_driver->dev)) {
3675 printk(KERN_WARNING "Unable to create device for %s; "
3676 "errno = %ld\n", con_driver->desc,
3677 PTR_ERR(con_driver->dev));
3678 con_driver->dev = NULL;
3680 vtconsole_init_device(con_driver);
3690 * do_unregister_con_driver - unregister console driver from console layer
3691 * @csw: console driver
3693 * DESCRIPTION: All drivers that registers to the console layer must
3694 * call this function upon exit, or if the console driver is in a state
3695 * where it won't be able to handle console services, such as the
3696 * framebuffer console without loaded framebuffer drivers.
3698 * The driver must unbind first prior to unregistration.
3700 int do_unregister_con_driver(const struct consw *csw)
3704 /* cannot unregister a bound driver */
3705 if (con_is_bound(csw))
3708 if (csw == conswitchp)
3711 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3712 struct con_driver *con_driver = ®istered_con_driver[i];
3714 if (con_driver->con == csw) {
3716 * Defer the removal of the sysfs entries since that
3717 * will acquire the kernfs s_active lock and we can't
3718 * acquire this lock while holding the console lock:
3719 * the unbind sysfs entry imposes already the opposite
3720 * order. Reset con already here to prevent any later
3721 * lookup to succeed and mark this slot as zombie, so
3722 * it won't get reused until we complete the removal
3723 * in the deferred work.
3725 con_driver->con = NULL;
3726 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3727 schedule_work(&con_driver_unregister_work);
3735 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3737 static void con_driver_unregister_callback(struct work_struct *ignored)
3743 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3744 struct con_driver *con_driver = ®istered_con_driver[i];
3746 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3751 vtconsole_deinit_device(con_driver);
3752 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3756 if (WARN_ON_ONCE(con_driver->con))
3757 con_driver->con = NULL;
3758 con_driver->desc = NULL;
3759 con_driver->dev = NULL;
3760 con_driver->node = 0;
3761 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3762 con_driver->flag = 0;
3763 con_driver->first = 0;
3764 con_driver->last = 0;
3771 * If we support more console drivers, this function is used
3772 * when a driver wants to take over some existing consoles
3773 * and become default driver for newly opened ones.
3775 * do_take_over_console is basically a register followed by unbind
3777 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3781 err = do_register_con_driver(csw, first, last);
3783 * If we get an busy error we still want to bind the console driver
3784 * and return success, as we may have unbound the console driver
3785 * but not unregistered it.
3790 do_bind_con_driver(csw, first, last, deflt);
3794 EXPORT_SYMBOL_GPL(do_take_over_console);
3798 * give_up_console is a wrapper to unregister_con_driver. It will only
3799 * work if driver is fully unbound.
3801 void give_up_console(const struct consw *csw)
3804 do_unregister_con_driver(csw);
3808 static int __init vtconsole_class_init(void)
3812 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3813 if (IS_ERR(vtconsole_class)) {
3814 printk(KERN_WARNING "Unable to create vt console class; "
3815 "errno = %ld\n", PTR_ERR(vtconsole_class));
3816 vtconsole_class = NULL;
3819 /* Add system drivers to sysfs */
3820 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3821 struct con_driver *con = ®istered_con_driver[i];
3823 if (con->con && !con->dev) {
3825 device_create_with_groups(vtconsole_class, NULL,
3826 MKDEV(0, con->node),
3827 con, con_dev_groups,
3828 "vtcon%i", con->node);
3830 if (IS_ERR(con->dev)) {
3831 printk(KERN_WARNING "Unable to create "
3832 "device for %s; errno = %ld\n",
3833 con->desc, PTR_ERR(con->dev));
3836 vtconsole_init_device(con);
3843 postcore_initcall(vtconsole_class_init);
3851 static int set_vesa_blanking(char __user *p)
3855 if (get_user(mode, p + 1))
3858 vesa_blank_mode = (mode < 4) ? mode : 0;
3862 void do_blank_screen(int entering_gfx)
3864 struct vc_data *vc = vc_cons[fg_console].d;
3867 WARN_CONSOLE_UNLOCKED();
3869 if (console_blanked) {
3870 if (blank_state == blank_vesa_wait) {
3871 blank_state = blank_off;
3872 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3877 /* entering graphics mode? */
3881 vc->vc_sw->con_blank(vc, -1, 1);
3882 console_blanked = fg_console + 1;
3883 blank_state = blank_off;
3888 blank_state = blank_off;
3890 /* don't blank graphics */
3891 if (vc->vc_mode != KD_TEXT) {
3892 console_blanked = fg_console + 1;
3897 del_timer_sync(&console_timer);
3898 blank_timer_expired = 0;
3901 /* In case we need to reset origin, blanking hook returns 1 */
3902 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3903 console_blanked = fg_console + 1;
3907 if (console_blank_hook && console_blank_hook(1))
3910 if (vesa_off_interval && vesa_blank_mode) {
3911 blank_state = blank_vesa_wait;
3912 mod_timer(&console_timer, jiffies + vesa_off_interval);
3914 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3916 EXPORT_SYMBOL(do_blank_screen);
3919 * Called by timer as well as from vt_console_driver
3921 void do_unblank_screen(int leaving_gfx)
3925 /* This should now always be called from a "sane" (read: can schedule)
3926 * context for the sake of the low level drivers, except in the special
3927 * case of oops_in_progress
3929 if (!oops_in_progress)
3932 WARN_CONSOLE_UNLOCKED();
3935 if (!console_blanked)
3937 if (!vc_cons_allocated(fg_console)) {
3939 pr_warn("unblank_screen: tty %d not allocated ??\n",
3943 vc = vc_cons[fg_console].d;
3944 /* Try to unblank in oops case too */
3945 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3946 return; /* but leave console_blanked != 0 */
3948 if (blankinterval) {
3949 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3950 blank_state = blank_normal_wait;
3953 console_blanked = 0;
3954 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3955 /* Low-level driver cannot restore -> do it ourselves */
3957 if (console_blank_hook)
3958 console_blank_hook(0);
3961 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3963 EXPORT_SYMBOL(do_unblank_screen);
3966 * This is called by the outside world to cause a forced unblank, mostly for
3967 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3968 * call it with 1 as an argument and so force a mode restore... that may kill
3969 * X or at least garbage the screen but would also make the Oops visible...
3971 void unblank_screen(void)
3973 do_unblank_screen(0);
3977 * We defer the timer blanking to work queue so it can take the console mutex
3978 * (console operations can still happen at irq time, but only from printk which
3979 * has the console mutex. Not perfect yet, but better than no locking
3981 static void blank_screen_t(unsigned long dummy)
3983 blank_timer_expired = 1;
3984 schedule_work(&console_work);
3987 void poke_blanked_console(void)
3989 WARN_CONSOLE_UNLOCKED();
3991 /* Add this so we quickly catch whoever might call us in a non
3992 * safe context. Nowadays, unblank_screen() isn't to be called in
3993 * atomic contexts and is allowed to schedule (with the special case
3994 * of oops_in_progress, but that isn't of any concern for this
3999 /* This isn't perfectly race free, but a race here would be mostly harmless,
4000 * at worse, we'll do a spurrious blank and it's unlikely
4002 del_timer(&console_timer);
4003 blank_timer_expired = 0;
4005 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4007 if (console_blanked)
4009 else if (blankinterval) {
4010 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4011 blank_state = blank_normal_wait;
4019 static void set_palette(struct vc_data *vc)
4021 WARN_CONSOLE_UNLOCKED();
4023 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4024 vc->vc_sw->con_set_palette(vc, color_table);
4028 * Load palette into the DAC registers. arg points to a colour
4029 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4032 int con_set_cmap(unsigned char __user *arg)
4035 unsigned char colormap[3*16];
4037 if (copy_from_user(colormap, arg, sizeof(colormap)))
4041 for (i = k = 0; i < 16; i++) {
4042 default_red[i] = colormap[k++];
4043 default_grn[i] = colormap[k++];
4044 default_blu[i] = colormap[k++];
4046 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4047 if (!vc_cons_allocated(i))
4049 for (j = k = 0; j < 16; j++) {
4050 vc_cons[i].d->vc_palette[k++] = default_red[j];
4051 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4052 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4054 set_palette(vc_cons[i].d);
4061 int con_get_cmap(unsigned char __user *arg)
4064 unsigned char colormap[3*16];
4067 for (i = k = 0; i < 16; i++) {
4068 colormap[k++] = default_red[i];
4069 colormap[k++] = default_grn[i];
4070 colormap[k++] = default_blu[i];
4074 if (copy_to_user(arg, colormap, sizeof(colormap)))
4080 void reset_palette(struct vc_data *vc)
4083 for (j=k=0; j<16; j++) {
4084 vc->vc_palette[k++] = default_red[j];
4085 vc->vc_palette[k++] = default_grn[j];
4086 vc->vc_palette[k++] = default_blu[j];
4094 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4095 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4096 * depending on width) reserved for each character which is kinda wasty, but
4097 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4098 * is up to the actual low-level console-driver convert data into its favorite
4099 * format (maybe we should add a `fontoffset' field to the `display'
4100 * structure so we won't have to convert the fontdata all the time.
4104 #define max_font_size 65536
4106 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4108 struct console_font font;
4113 font.data = kmalloc(max_font_size, GFP_KERNEL);
4120 if (vc->vc_mode != KD_TEXT)
4122 else if (vc->vc_sw->con_font_get)
4123 rc = vc->vc_sw->con_font_get(vc, &font);
4131 c = (font.width+7)/8 * 32 * font.charcount;
4133 if (op->data && font.charcount > op->charcount)
4135 if (font.width > op->width || font.height > op->height)
4140 op->height = font.height;
4141 op->width = font.width;
4142 op->charcount = font.charcount;
4144 if (op->data && copy_to_user(op->data, font.data, c))
4152 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4154 struct console_font font;
4158 if (vc->vc_mode != KD_TEXT)
4162 if (op->charcount > 512)
4164 if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32)
4166 size = (op->width+7)/8 * 32 * op->charcount;
4167 if (size > max_font_size)
4169 font.charcount = op->charcount;
4170 font.height = op->height;
4171 font.width = op->width;
4172 font.data = memdup_user(op->data, size);
4173 if (IS_ERR(font.data))
4174 return PTR_ERR(font.data);
4176 if (vc->vc_mode != KD_TEXT)
4178 else if (vc->vc_sw->con_font_set) {
4181 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4189 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4191 struct console_font font = {.width = op->width, .height = op->height};
4192 char name[MAX_FONT_NAME];
4199 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4202 name[MAX_FONT_NAME - 1] = 0;
4205 if (vc->vc_mode != KD_TEXT) {
4209 if (vc->vc_sw->con_font_default) {
4212 rc = vc->vc_sw->con_font_default(vc, &font, s);
4217 op->width = font.width;
4218 op->height = font.height;
4223 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4226 case KD_FONT_OP_SET:
4227 return con_font_set(vc, op);
4228 case KD_FONT_OP_GET:
4229 return con_font_get(vc, op);
4230 case KD_FONT_OP_SET_DEFAULT:
4231 return con_font_default(vc, op);
4232 case KD_FONT_OP_COPY:
4233 /* was buggy and never really used */
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);
4260 EXPORT_SYMBOL_GPL(screen_pos);
4262 void getconsxy(struct vc_data *vc, unsigned char *p)
4268 void putconsxy(struct vc_data *vc, unsigned char *p)
4271 gotoxy(vc, p[0], p[1]);
4275 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4277 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4278 return softcursor_original;
4279 return scr_readw(org);
4282 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4284 scr_writew(val, org);
4285 if ((unsigned long)org == vc->vc_pos) {
4286 softcursor_original = -1;
4291 void vcs_scr_updated(struct vc_data *vc)
4296 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4297 unsigned int rolled_over, void *base, unsigned int size)
4299 unsigned long ubase = (unsigned long)base;
4300 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4301 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4302 ptrdiff_t origin = (void *)c->vc_origin - base;
4303 int margin = c->vc_size_row * 4;
4304 int from, wrap, from_off, avail;
4306 /* Turn scrollback off */
4308 c->vc_visible_origin = c->vc_origin;
4312 /* Do we have already enough to allow jumping from 0 to the end? */
4313 if (rolled_over > scr_end + margin) {
4315 wrap = rolled_over + c->vc_size_row;
4321 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4322 avail = (origin - from + wrap) % wrap;
4324 /* Only a little piece would be left? Show all incl. the piece! */
4325 if (avail < 2 * margin)
4327 if (from_off < margin)
4329 if (from_off > avail - margin)
4332 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4334 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4337 * Visible symbols for modules
4340 EXPORT_SYMBOL(color_table);
4341 EXPORT_SYMBOL(default_red);
4342 EXPORT_SYMBOL(default_grn);
4343 EXPORT_SYMBOL(default_blu);
4344 EXPORT_SYMBOL(update_region);
4345 EXPORT_SYMBOL(redraw_screen);
4346 EXPORT_SYMBOL(vc_resize);
4347 EXPORT_SYMBOL(fg_console);
4348 EXPORT_SYMBOL(console_blank_hook);
4349 EXPORT_SYMBOL(console_blanked);
4350 EXPORT_SYMBOL(vc_cons);
4351 EXPORT_SYMBOL(global_cursor_default);
4352 #ifndef VT_SINGLE_DRIVER
4353 EXPORT_SYMBOL(give_up_console);