1	// SPDX-License-Identifier: GPL-2.0
2	/*
3	* Copyright (C) 1991, 1992 Linus Torvalds
4	*/
5
6	/*
7	* Hopefully this will be a rather complete VT102 implementation.
8	*
9	* Beeping thanks to John T Kohl.
10	*
11	* Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12	* Chars, and VT100 enhancements by Peter MacDonald.
13	*
14	* Copy and paste function by Andrew Haylett,
15	* some enhancements by Alessandro Rubini.
16	*
17	* Code to check for different video-cards mostly by Galen Hunt,
18	* <g-hunt@ee.utah.edu>
19	*
20	* Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21	* Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22	*
23	* Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24	* Resizing of consoles, aeb, 940926
25	*
26	* Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27	* <poe@daimi.aau.dk>
28	*
29	* User-defined bell sound, new setterm control sequences and printk
30	* redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31	*
32	* APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33	*
34	* Merge with the abstract console driver by Geert Uytterhoeven
35	* <geert@linux-m68k.org>, Jan 1997.
36	*
37	* Original m68k console driver modifications by
38	*
39	* - Arno Griffioen <arno@usn.nl>
40	* - David Carter <carter@cs.bris.ac.uk>
41	*
42	* The abstract console driver provides a generic interface for a text
43	* console. It supports VGA text mode, frame buffer based graphical consoles
44	* and special graphics processors that are only accessible through some
45	* registers (e.g. a TMS340x0 GSP).
46	*
47	* The interface to the hardware is specified using a special structure
48	* (struct consw) which contains function pointers to console operations
49	* (see <linux/console.h> for more information).
50	*
51	* Support for changeable cursor shape
52	* by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53	*
54	* Ported to i386 and con_scrolldelta fixed
55	* by Emmanuel Marty <core@ggi-project.org>, April 1998
56	*
57	* Resurrected character buffers in videoram plus lots of other trickery
58	* by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59	*
60	* Removed old-style timers, introduced console_timer, made timer
61	* deletion SMP-safe. 17Jun00, Andrew Morton
62	*
63	* Removed console_lock, enabled interrupts across all console operations
64	* 13 March 2001, Andrew Morton
65	*
66	* Fixed UTF-8 mode so alternate charset modes always work according
67	* to control sequences interpreted in do_con_trol function
68	* preserving backward VT100 semigraphics compatibility,
69	* malformed UTF sequences represented as sequences of replacement glyphs,
70	* original codes or '?' as a last resort if replacement glyph is undefined
71	* by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72	*/
73
74	#include <linux/module.h>
75	#include <linux/types.h>
76	#include <linux/sched/signal.h>
77	#include <linux/tty.h>
78	#include <linux/tty_flip.h>
79	#include <linux/kernel.h>
80	#include <linux/string.h>
81	#include <linux/errno.h>
82	#include <linux/kd.h>
83	#include <linux/slab.h>
84	#include <linux/vmalloc.h>
85	#include <linux/major.h>
86	#include <linux/mm.h>
87	#include <linux/console.h>
88	#include <linux/init.h>
89	#include <linux/mutex.h>
90	#include <linux/vt_kern.h>
91	#include <linux/selection.h>
92	#include <linux/tiocl.h>
93	#include <linux/kbd_kern.h>
94	#include <linux/consolemap.h>
95	#include <linux/timer.h>
96	#include <linux/interrupt.h>
97	#include <linux/workqueue.h>
98	#include <linux/pm.h>
99	#include <linux/font.h>
100	#include <linux/bitops.h>
101	#include <linux/notifier.h>
102	#include <linux/device.h>
103	#include <linux/io.h>
104	#include <linux/uaccess.h>
105	#include <linux/kdb.h>
106	#include <linux/ctype.h>
107	#include <linux/bsearch.h>
108	#include <linux/gcd.h>
109
110	#define MAX_NR_CON_DRIVER 16
111
112	#define CON_DRIVER_FLAG_MODULE 1
113	#define CON_DRIVER_FLAG_INIT 2
114	#define CON_DRIVER_FLAG_ATTR 4
115	#define CON_DRIVER_FLAG_ZOMBIE 8
116
117	struct con_driver {
118	const struct consw *con;
119	const char *desc;
120	struct device *dev;
121	int node;
122	int first;
123	int last;
124	int flag;
125	};
126
127	static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128	const struct consw *conswitchp;
129
130	/*
131	* Here is the default bell parameters: 750HZ, 1/8th of a second
132	*/
133	#define DEFAULT_BELL_PITCH 750
134	#define DEFAULT_BELL_DURATION (HZ/8)
135	#define DEFAULT_CURSOR_BLINK_MS 200
136
137	struct vc vc_cons [MAX_NR_CONSOLES];
138	EXPORT_SYMBOL(vc_cons);
139
140	static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141
142	static int con_open(struct tty_struct *, struct file *);
143	static void vc_init(struct vc_data *vc, int do_clear);
144	static void gotoxy(struct vc_data *vc, int new_x, int new_y);
145	static void save_cur(struct vc_data *vc);
146	static void reset_terminal(struct vc_data *vc, int do_clear);
147	static void con_flush_chars(struct tty_struct *tty);
148	static int set_vesa_blanking(char __user *p);
149	static void set_cursor(struct vc_data *vc);
150	static void hide_cursor(struct vc_data *vc);
151	static void console_callback(struct work_struct *ignored);
152	static void con_driver_unregister_callback(struct work_struct *ignored);
153	static void blank_screen_t(struct timer_list *unused);
154	static void set_palette(struct vc_data *vc);
155	static void unblank_screen(void);
156
157	#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
158
159	int default_utf8 = true;
160	module_param(default_utf8, int, S_IRUGO | S_IWUSR);
161	int global_cursor_default = -1;
162	module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
163	EXPORT_SYMBOL(global_cursor_default);
164
165	static int cur_default = CUR_UNDERLINE;
166	module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
168	/*
169	* ignore_poke: don't unblank the screen when things are typed. This is
170	* mainly for the privacy of braille terminal users.
171	*/
172	static int ignore_poke;
173
174	int do_poke_blanked_console;
175	int console_blanked;
176	EXPORT_SYMBOL(console_blanked);
177
178	static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
179	static int vesa_off_interval;
180	static int blankinterval;
181	core_param(consoleblank, blankinterval, int, 0444);
182
183	static DECLARE_WORK(console_work, console_callback);
184	static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185
186	/*
187	* fg_console is the current virtual console,
188	* last_console is the last used one,
189	* want_console is the console we want to switch to,
190	* saved_* variants are for save/restore around kernel debugger enter/leave
191	*/
192	int fg_console;
193	EXPORT_SYMBOL(fg_console);
194	int last_console;
195	int want_console = -1;
196
197	static int saved_fg_console;
198	static int saved_last_console;
199	static int saved_want_console;
200	static int saved_vc_mode;
201	static int saved_console_blanked;
202
203	/*
204	* For each existing display, we have a pointer to console currently visible
205	* on that display, allowing consoles other than fg_console to be refreshed
206	* appropriately. Unless the low-level driver supplies its own display_fg
207	* variable, we use this one for the "master display".
208	*/
209	static struct vc_data *master_display_fg;
210
211	/*
212	* Unfortunately, we need to delay tty echo when we're currently writing to the
213	* console since the code is (and always was) not re-entrant, so we schedule
214	* all flip requests to process context with schedule-task() and run it from
215	* console_callback().
216	*/
217
218	/*
219	* For the same reason, we defer scrollback to the console callback.
220	*/
221	static int scrollback_delta;
222
223	/*
224	* Hook so that the power management routines can (un)blank
225	* the console on our behalf.
226	*/
227	int (*console_blank_hook)(int);
228	EXPORT_SYMBOL(console_blank_hook);
229
230	static DEFINE_TIMER(console_timer, blank_screen_t);
231	static int blank_state;
232	static int blank_timer_expired;
233	enum {
234	blank_off = 0,
235	blank_normal_wait,
236	blank_vesa_wait,
237	};
238
239	/*
240	* /sys/class/tty/tty0/
241	*
242	* the attribute 'active' contains the name of the current vc
243	* console and it supports poll() to detect vc switches
244	*/
245	static struct device *tty0dev;
246
247	/*
248	* Notifier list for console events.
249	*/
250	static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
251
252	int register_vt_notifier(struct notifier_block *nb)
253	{
254	return atomic_notifier_chain_register(nh: &vt_notifier_list, nb);
255	}
256	EXPORT_SYMBOL_GPL(register_vt_notifier);
257
258	int unregister_vt_notifier(struct notifier_block *nb)
259	{
260	return atomic_notifier_chain_unregister(nh: &vt_notifier_list, nb);
261	}
262	EXPORT_SYMBOL_GPL(unregister_vt_notifier);
263
264	static void notify_write(struct vc_data *vc, unsigned int unicode)
265	{
266	struct vt_notifier_param param = { .vc = vc, .c = unicode };
267	atomic_notifier_call_chain(nh: &vt_notifier_list, VT_WRITE, v: &param);
268	}
269
270	static void notify_update(struct vc_data *vc)
271	{
272	struct vt_notifier_param param = { .vc = vc };
273	atomic_notifier_call_chain(nh: &vt_notifier_list, VT_UPDATE, v: &param);
274	}
275	/*
276	* Low-Level Functions
277	*/
278
279	static inline bool con_is_fg(const struct vc_data *vc)
280	{
281	return vc->vc_num == fg_console;
282	}
283
284	static inline bool con_should_update(const struct vc_data *vc)
285	{
286	return con_is_visible(vc) && !console_blanked;
287	}
288
289	static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
290	bool viewed)
291	{
292	unsigned short *p;
293
294	if (!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);
298	else
299	p = vc->vc_sw->con_screen_pos(vc, offset);
300	return p;
301	}
302
303	/* Called from the keyboard irq path.. */
304	static inline void scrolldelta(int lines)
305	{
306	/* FIXME */
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();
311	}
312
313	void schedule_console_callback(void)
314	{
315	schedule_work(work: &console_work);
316	}
317
318	/*
319	* Code to manage unicode-based screen buffers
320	*/
321
322	/*
323	* Our screen buffer is preceded by an array of line pointers so that
324	* scrolling only implies some pointer shuffling.
325	*/
326
327	static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
328	{
329	u32 **uni_lines;
330	void *p;
331	unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
332
333	/* allocate everything in one go */
334	memsize = col_size * rows;
335	memsize += rows * sizeof(*uni_lines);
336	uni_lines = vzalloc(size: memsize);
337	if (!uni_lines)
338	return NULL;
339
340	/* initial line pointers */
341	p = uni_lines + rows;
342	for (i = 0; i < rows; i++) {
343	uni_lines[i] = p;
344	p += col_size;
345	}
346
347	return uni_lines;
348	}
349
350	static void vc_uniscr_free(u32 **uni_lines)
351	{
352	vfree(addr: uni_lines);
353	}
354
355	static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
356	{
357	vc_uniscr_free(uni_lines: vc->vc_uni_lines);
358	vc->vc_uni_lines = new_uni_lines;
359	}
360
361	static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
362	{
363	if (vc->vc_uni_lines)
364	vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
365	}
366
367	static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
368	{
369	if (vc->vc_uni_lines) {
370	u32 *ln = vc->vc_uni_lines[vc->state.y];
371	unsigned int x = vc->state.x, cols = vc->vc_cols;
372
373	memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
374	memset32(s: &ln[x], v: ' ', n: nr);
375	}
376	}
377
378	static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
379	{
380	if (vc->vc_uni_lines) {
381	u32 *ln = vc->vc_uni_lines[vc->state.y];
382	unsigned int x = vc->state.x, cols = vc->vc_cols;
383
384	memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
385	memset32(s: &ln[cols - nr], v: ' ', n: nr);
386	}
387	}
388
389	static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
390	unsigned int nr)
391	{
392	if (vc->vc_uni_lines)
393	memset32(s: &vc->vc_uni_lines[vc->state.y][x], v: ' ', n: nr);
394	}
395
396	static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
397	unsigned int nr)
398	{
399	if (vc->vc_uni_lines)
400	while (nr--)
401	memset32(s: vc->vc_uni_lines[y++], v: ' ', n: vc->vc_cols);
402	}
403
404	/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
405	static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
406	{
407	unsigned int gcd_idx;
408
409	for (gcd_idx = 0; gcd_idx < gcd(a: nr, b: size); gcd_idx++) {
410	u32 *gcd_idx_val = array[gcd_idx];
411	unsigned int dst_idx = gcd_idx;
412
413	while (1) {
414	unsigned int src_idx = (dst_idx + nr) % size;
415	if (src_idx == gcd_idx)
416	break;
417
418	array[dst_idx] = array[src_idx];
419	dst_idx = src_idx;
420	}
421
422	array[dst_idx] = gcd_idx_val;
423	}
424	}
425
426	static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
427	unsigned int bottom, enum con_scroll dir,
428	unsigned int nr)
429	{
430	u32 **uni_lines = vc->vc_uni_lines;
431	unsigned int size = bottom - top;
432
433	if (!uni_lines)
434	return;
435
436	if (dir == SM_DOWN) {
437	juggle_array(array: &uni_lines[top], size, nr: size - nr);
438	vc_uniscr_clear_lines(vc, y: top, nr);
439	} else {
440	juggle_array(array: &uni_lines[top], size, nr);
441	vc_uniscr_clear_lines(vc, y: bottom - nr, nr);
442	}
443	}
444
445	static void vc_uniscr_copy_area(u32 **dst_lines,
446	unsigned int dst_cols,
447	unsigned int dst_rows,
448	u32 **src_lines,
449	unsigned int src_cols,
450	unsigned int src_top_row,
451	unsigned int src_bot_row)
452	{
453	unsigned int dst_row = 0;
454
455	if (!dst_lines)
456	return;
457
458	while (src_top_row < src_bot_row) {
459	u32 *src_line = src_lines[src_top_row];
460	u32 *dst_line = dst_lines[dst_row];
461
462	memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
463	if (dst_cols - src_cols)
464	memset32(s: dst_line + src_cols, v: ' ', n: dst_cols - src_cols);
465	src_top_row++;
466	dst_row++;
467	}
468	while (dst_row < dst_rows) {
469	u32 *dst_line = dst_lines[dst_row];
470
471	memset32(s: dst_line, v: ' ', n: dst_cols);
472	dst_row++;
473	}
474	}
475
476	/*
477	* Called from vcs_read() to make sure unicode screen retrieval is possible.
478	* This will initialize the unicode screen buffer if not already done.
479	* This returns 0 if OK, or a negative error code otherwise.
480	* In particular, -ENODATA is returned if the console is not in UTF-8 mode.
481	*/
482	int vc_uniscr_check(struct vc_data *vc)
483	{
484	u32 **uni_lines;
485	unsigned short *p;
486	int x, y, mask;
487
488	WARN_CONSOLE_UNLOCKED();
489
490	if (!vc->vc_utf)
491	return -ENODATA;
492
493	if (vc->vc_uni_lines)
494	return 0;
495
496	uni_lines = vc_uniscr_alloc(cols: vc->vc_cols, rows: vc->vc_rows);
497	if (!uni_lines)
498	return -ENOMEM;
499
500	/*
501	* Let's populate it initially with (imperfect) reverse translation.
502	* This is the next best thing we can do short of having it enabled
503	* from the start even when no users rely on this functionality. True
504	* unicode content will be available after a complete screen refresh.
505	*/
506	p = (unsigned short *)vc->vc_origin;
507	mask = vc->vc_hi_font_mask | 0xff;
508	for (y = 0; y < vc->vc_rows; y++) {
509	u32 *line = uni_lines[y];
510	for (x = 0; x < vc->vc_cols; x++) {
511	u16 glyph = scr_readw(p++) & mask;
512	line[x] = inverse_translate(conp: vc, glyph, use_unicode: true);
513	}
514	}
515
516	vc->vc_uni_lines = uni_lines;
517
518	return 0;
519	}
520
521	/*
522	* Called from vcs_read() to get the unicode data from the screen.
523	* This must be preceded by a successful call to vc_uniscr_check() once
524	* the console lock has been taken.
525	*/
526	void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
527	unsigned int row, unsigned int col, unsigned int nr)
528	{
529	u32 **uni_lines = vc->vc_uni_lines;
530	int offset = row * vc->vc_size_row + col * 2;
531	unsigned long pos;
532
533	if (WARN_ON_ONCE(!uni_lines))
534	return;
535
536	pos = (unsigned long)screenpos(vc, offset, viewed);
537	if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
538	/*
539	* Desired position falls in the main screen buffer.
540	* However the actual row/col might be different if
541	* scrollback is active.
542	*/
543	row = (pos - vc->vc_origin) / vc->vc_size_row;
544	col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
545	memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
546	} else {
547	/*
548	* Scrollback is active. For now let's simply backtranslate
549	* the screen glyphs until the unicode screen buffer does
550	* synchronize with console display drivers for a scrollback
551	* buffer of its own.
552	*/
553	u16 *p = (u16 *)pos;
554	int mask = vc->vc_hi_font_mask | 0xff;
555	u32 *uni_buf = dest;
556	while (nr--) {
557	u16 glyph = scr_readw(p++) & mask;
558	*uni_buf++ = inverse_translate(conp: vc, glyph, use_unicode: true);
559	}
560	}
561	}
562
563	static void con_scroll(struct vc_data *vc, unsigned int top,
564	unsigned int bottom, enum con_scroll dir,
565	unsigned int nr)
566	{
567	unsigned int rows = bottom - top;
568	u16 *clear, *dst, *src;
569
570	if (top + nr >= bottom)
571	nr = rows - 1;
572	if (bottom > vc->vc_rows || top >= bottom || nr < 1)
573	return;
574
575	vc_uniscr_scroll(vc, top, bottom, dir, nr);
576	if (con_is_visible(vc) &&
577	vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
578	return;
579
580	src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
581	dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
582
583	if (dir == SM_UP) {
584	clear = src + (rows - nr) * vc->vc_cols;
585	swap(src, dst);
586	}
587	scr_memmovew(d: dst, s: src, count: (rows - nr) * vc->vc_size_row);
588	scr_memsetw(s: clear, c: vc->vc_video_erase_char, count: vc->vc_size_row * nr);
589	}
590
591	static void do_update_region(struct vc_data *vc, unsigned long start, int count)
592	{
593	unsigned int xx, yy, offset;
594	u16 *p;
595
596	p = (u16 *) start;
597	if (!vc->vc_sw->con_getxy) {
598	offset = (start - vc->vc_origin) / 2;
599	xx = offset % vc->vc_cols;
600	yy = offset / vc->vc_cols;
601	} else {
602	int nxx, nyy;
603	start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
604	xx = nxx; yy = nyy;
605	}
606	for(;;) {
607	u16 attrib = scr_readw(p) & 0xff00;
608	int startx = xx;
609	u16 *q = p;
610	while (xx < vc->vc_cols && count) {
611	if (attrib != (scr_readw(p) & 0xff00)) {
612	if (p > q)
613	vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
614	startx = xx;
615	q = p;
616	attrib = scr_readw(p) & 0xff00;
617	}
618	p++;
619	xx++;
620	count--;
621	}
622	if (p > q)
623	vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
624	if (!count)
625	break;
626	xx = 0;
627	yy++;
628	if (vc->vc_sw->con_getxy) {
629	p = (u16 *)start;
630	start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
631	}
632	}
633	}
634
635	void update_region(struct vc_data *vc, unsigned long start, int count)
636	{
637	WARN_CONSOLE_UNLOCKED();
638
639	if (con_should_update(vc)) {
640	hide_cursor(vc);
641	do_update_region(vc, start, count);
642	set_cursor(vc);
643	}
644	}
645	EXPORT_SYMBOL(update_region);
646
647	/* Structure of attributes is hardware-dependent */
648
649	static u8 build_attr(struct vc_data *vc, u8 _color,
650	enum vc_intensity _intensity, bool _blink, bool _underline,
651	bool _reverse, bool _italic)
652	{
653	if (vc->vc_sw->con_build_attr)
654	return vc->vc_sw->con_build_attr(vc, _color, _intensity,
655	_blink, _underline, _reverse, _italic);
656
657	/*
658	* ++roman: I completely changed the attribute format for monochrome
659	* mode (!can_do_color). The formerly used MDA (monochrome display
660	* adapter) format didn't allow the combination of certain effects.
661	* Now the attribute is just a bit vector:
662	* Bit 0..1: intensity (0..2)
663	* Bit 2 : underline
664	* Bit 3 : reverse
665	* Bit 7 : blink
666	*/
667	{
668	u8 a = _color;
669	if (!vc->vc_can_do_color)
670	return _intensity |
671	(_italic << 1) |
672	(_underline << 2) |
673	(_reverse << 3) |
674	(_blink << 7);
675	if (_italic)
676	a = (a & 0xF0) | vc->vc_itcolor;
677	else if (_underline)
678	a = (a & 0xf0) | vc->vc_ulcolor;
679	else if (_intensity == VCI_HALF_BRIGHT)
680	a = (a & 0xf0) | vc->vc_halfcolor;
681	if (_reverse)
682	a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
683	if (_blink)
684	a ^= 0x80;
685	if (_intensity == VCI_BOLD)
686	a ^= 0x08;
687	if (vc->vc_hi_font_mask == 0x100)
688	a <<= 1;
689	return a;
690	}
691	}
692
693	static void update_attr(struct vc_data *vc)
694	{
695	vc->vc_attr = build_attr(vc, color: vc->state.color, intensity: vc->state.intensity,
696	blink: vc->state.blink, underline: vc->state.underline,
697	reverse: vc->state.reverse ^ vc->vc_decscnm, italic: vc->state.italic);
698	vc->vc_video_erase_char = ' ' | (build_attr(vc, color: vc->state.color,
699	intensity: VCI_NORMAL, blink: vc->state.blink, underline: false,
700	reverse: vc->vc_decscnm, italic: false) << 8);
701	}
702
703	/* Note: inverting the screen twice should revert to the original state */
704	void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
705	{
706	unsigned short *p;
707
708	WARN_CONSOLE_UNLOCKED();
709
710	count /= 2;
711	p = screenpos(vc, offset, viewed);
712	if (vc->vc_sw->con_invert_region) {
713	vc->vc_sw->con_invert_region(vc, p, count);
714	} else {
715	u16 *q = p;
716	int cnt = count;
717	u16 a;
718
719	if (!vc->vc_can_do_color) {
720	while (cnt--) {
721	a = scr_readw(q);
722	a ^= 0x0800;
723	scr_writew(a, q);
724	q++;
725	}
726	} else if (vc->vc_hi_font_mask == 0x100) {
727	while (cnt--) {
728	a = scr_readw(q);
729	a = (a & 0x11ff) |
730	((a & 0xe000) >> 4) |
731	((a & 0x0e00) << 4);
732	scr_writew(a, q);
733	q++;
734	}
735	} else {
736	while (cnt--) {
737	a = scr_readw(q);
738	a = (a & 0x88ff) |
739	((a & 0x7000) >> 4) |
740	((a & 0x0700) << 4);
741	scr_writew(a, q);
742	q++;
743	}
744	}
745	}
746
747	if (con_should_update(vc))
748	do_update_region(vc, start: (unsigned long) p, count);
749	notify_update(vc);
750	}
751
752	/* used by selection: complement pointer position */
753	void complement_pos(struct vc_data *vc, int offset)
754	{
755	static int old_offset = -1;
756	static unsigned short old;
757	static unsigned short oldx, oldy;
758
759	WARN_CONSOLE_UNLOCKED();
760
761	if (old_offset != -1 && old_offset >= 0 &&
762	old_offset < vc->vc_screenbuf_size) {
763	scr_writew(old, screenpos(vc, old_offset, true));
764	if (con_should_update(vc))
765	vc->vc_sw->con_putc(vc, old, oldy, oldx);
766	notify_update(vc);
767	}
768
769	old_offset = offset;
770
771	if (offset != -1 && offset >= 0 &&
772	offset < vc->vc_screenbuf_size) {
773	unsigned short new;
774	unsigned short *p;
775	p = screenpos(vc, offset, viewed: true);
776	old = scr_readw(p);
777	new = old ^ vc->vc_complement_mask;
778	scr_writew(new, p);
779	if (con_should_update(vc)) {
780	oldx = (offset >> 1) % vc->vc_cols;
781	oldy = (offset >> 1) / vc->vc_cols;
782	vc->vc_sw->con_putc(vc, new, oldy, oldx);
783	}
784	notify_update(vc);
785	}
786	}
787
788	static void insert_char(struct vc_data *vc, unsigned int nr)
789	{
790	unsigned short *p = (unsigned short *) vc->vc_pos;
791
792	vc_uniscr_insert(vc, nr);
793	scr_memmovew(d: p + nr, s: p, count: (vc->vc_cols - vc->state.x - nr) * 2);
794	scr_memsetw(s: p, c: vc->vc_video_erase_char, count: nr * 2);
795	vc->vc_need_wrap = 0;
796	if (con_should_update(vc))
797	do_update_region(vc, start: (unsigned long) p,
798	count: vc->vc_cols - vc->state.x);
799	}
800
801	static void delete_char(struct vc_data *vc, unsigned int nr)
802	{
803	unsigned short *p = (unsigned short *) vc->vc_pos;
804
805	vc_uniscr_delete(vc, nr);
806	scr_memmovew(d: p, s: p + nr, count: (vc->vc_cols - vc->state.x - nr) * 2);
807	scr_memsetw(s: p + vc->vc_cols - vc->state.x - nr, c: vc->vc_video_erase_char,
808	count: nr * 2);
809	vc->vc_need_wrap = 0;
810	if (con_should_update(vc))
811	do_update_region(vc, start: (unsigned long) p,
812	count: vc->vc_cols - vc->state.x);
813	}
814
815	static int softcursor_original = -1;
816
817	static void add_softcursor(struct vc_data *vc)
818	{
819	int i = scr_readw((u16 *) vc->vc_pos);
820	u32 type = vc->vc_cursor_type;
821
822	if (!(type & CUR_SW))
823	return;
824	if (softcursor_original != -1)
825	return;
826	softcursor_original = i;
827	i |= CUR_SET(type);
828	i ^= CUR_CHANGE(type);
829	if ((type & CUR_ALWAYS_BG) &&
830	(softcursor_original & CUR_BG) == (i & CUR_BG))
831	i ^= CUR_BG;
832	if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
833	i ^= CUR_FG;
834	scr_writew(i, (u16 *)vc->vc_pos);
835	if (con_should_update(vc))
836	vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
837	}
838
839	static void hide_softcursor(struct vc_data *vc)
840	{
841	if (softcursor_original != -1) {
842	scr_writew(softcursor_original, (u16 *)vc->vc_pos);
843	if (con_should_update(vc))
844	vc->vc_sw->con_putc(vc, softcursor_original,
845	vc->state.y, vc->state.x);
846	softcursor_original = -1;
847	}
848	}
849
850	static void hide_cursor(struct vc_data *vc)
851	{
852	if (vc_is_sel(vc))
853	clear_selection();
854
855	vc->vc_sw->con_cursor(vc, CM_ERASE);
856	hide_softcursor(vc);
857	}
858
859	static void set_cursor(struct vc_data *vc)
860	{
861	if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
862	return;
863	if (vc->vc_deccm) {
864	if (vc_is_sel(vc))
865	clear_selection();
866	add_softcursor(vc);
867	if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
868	vc->vc_sw->con_cursor(vc, CM_DRAW);
869	} else
870	hide_cursor(vc);
871	}
872
873	static void set_origin(struct vc_data *vc)
874	{
875	WARN_CONSOLE_UNLOCKED();
876
877	if (!con_is_visible(vc) ||
878	!vc->vc_sw->con_set_origin ||
879	!vc->vc_sw->con_set_origin(vc))
880	vc->vc_origin = (unsigned long)vc->vc_screenbuf;
881	vc->vc_visible_origin = vc->vc_origin;
882	vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
883	vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
884	2 * vc->state.x;
885	}
886
887	static void save_screen(struct vc_data *vc)
888	{
889	WARN_CONSOLE_UNLOCKED();
890
891	if (vc->vc_sw->con_save_screen)
892	vc->vc_sw->con_save_screen(vc);
893	}
894
895	static void flush_scrollback(struct vc_data *vc)
896	{
897	WARN_CONSOLE_UNLOCKED();
898
899	set_origin(vc);
900	if (vc->vc_sw->con_flush_scrollback) {
901	vc->vc_sw->con_flush_scrollback(vc);
902	} else if (con_is_visible(vc)) {
903	/*
904	* When no con_flush_scrollback method is provided then the
905	* legacy way for flushing the scrollback buffer is to use
906	* a side effect of the con_switch method. We do it only on
907	* the foreground console as background consoles have no
908	* scrollback buffers in that case and we obviously don't
909	* want to switch to them.
910	*/
911	hide_cursor(vc);
912	vc->vc_sw->con_switch(vc);
913	set_cursor(vc);
914	}
915	}
916
917	/*
918	* Redrawing of screen
919	*/
920
921	void clear_buffer_attributes(struct vc_data *vc)
922	{
923	unsigned short *p = (unsigned short *)vc->vc_origin;
924	int count = vc->vc_screenbuf_size / 2;
925	int mask = vc->vc_hi_font_mask | 0xff;
926
927	for (; count > 0; count--, p++) {
928	scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
929	}
930	}
931
932	void redraw_screen(struct vc_data *vc, int is_switch)
933	{
934	int redraw = 0;
935
936	WARN_CONSOLE_UNLOCKED();
937
938	if (!vc) {
939	/* strange ... */
940	/* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
941	return;
942	}
943
944	if (is_switch) {
945	struct vc_data *old_vc = vc_cons[fg_console].d;
946	if (old_vc == vc)
947	return;
948	if (!con_is_visible(vc))
949	redraw = 1;
950	*vc->vc_display_fg = vc;
951	fg_console = vc->vc_num;
952	hide_cursor(vc: old_vc);
953	if (!con_is_visible(vc: old_vc)) {
954	save_screen(vc: old_vc);
955	set_origin(old_vc);
956	}
957	if (tty0dev)
958	sysfs_notify(kobj: &tty0dev->kobj, NULL, attr: "active");
959	} else {
960	hide_cursor(vc);
961	redraw = 1;
962	}
963
964	if (redraw) {
965	int update;
966	int old_was_color = vc->vc_can_do_color;
967
968	set_origin(vc);
969	update = vc->vc_sw->con_switch(vc);
970	set_palette(vc);
971	/*
972	* If console changed from mono<->color, the best we can do
973	* is to clear the buffer attributes. As it currently stands,
974	* rebuilding new attributes from the old buffer is not doable
975	* without overly complex code.
976	*/
977	if (old_was_color != vc->vc_can_do_color) {
978	update_attr(vc);
979	clear_buffer_attributes(vc);
980	}
981
982	if (update && vc->vc_mode != KD_GRAPHICS)
983	do_update_region(vc, start: vc->vc_origin, count: vc->vc_screenbuf_size / 2);
984	}
985	set_cursor(vc);
986	if (is_switch) {
987	vt_set_leds_compute_shiftstate();
988	notify_update(vc);
989	}
990	}
991	EXPORT_SYMBOL(redraw_screen);
992
993	/*
994	* Allocation, freeing and resizing of VTs.
995	*/
996
997	int vc_cons_allocated(unsigned int i)
998	{
999	return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1000	}
1001
1002	static void visual_init(struct vc_data *vc, int num, int init)
1003	{
1004	/* ++Geert: vc->vc_sw->con_init determines console size */
1005	if (vc->vc_sw)
1006	module_put(module: vc->vc_sw->owner);
1007	vc->vc_sw = conswitchp;
1008
1009	if (con_driver_map[num])
1010	vc->vc_sw = con_driver_map[num];
1011
1012	__module_get(module: vc->vc_sw->owner);
1013	vc->vc_num = num;
1014	vc->vc_display_fg = &master_display_fg;
1015	if (vc->uni_pagedict_loc)
1016	con_free_unimap(vc);
1017	vc->uni_pagedict_loc = &vc->uni_pagedict;
1018	vc->uni_pagedict = NULL;
1019	vc->vc_hi_font_mask = 0;
1020	vc->vc_complement_mask = 0;
1021	vc->vc_can_do_color = 0;
1022	vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1023	vc->vc_sw->con_init(vc, init);
1024	if (!vc->vc_complement_mask)
1025	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1026	vc->vc_s_complement_mask = vc->vc_complement_mask;
1027	vc->vc_size_row = vc->vc_cols << 1;
1028	vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1029	}
1030
1031
1032	static void visual_deinit(struct vc_data *vc)
1033	{
1034	vc->vc_sw->con_deinit(vc);
1035	module_put(module: vc->vc_sw->owner);
1036	}
1037
1038	static void vc_port_destruct(struct tty_port *port)
1039	{
1040	struct vc_data *vc = container_of(port, struct vc_data, port);
1041
1042	kfree(objp: vc);
1043	}
1044
1045	static const struct tty_port_operations vc_port_ops = {
1046	.destruct = vc_port_destruct,
1047	};
1048
1049	/*
1050	* Change # of rows and columns (0 means unchanged/the size of fg_console)
1051	* [this is to be used together with some user program
1052	* like resize that changes the hardware videomode]
1053	*/
1054	#define VC_MAXCOL (32767)
1055	#define VC_MAXROW (32767)
1056
1057	int vc_allocate(unsigned int currcons) /* return 0 on success */
1058	{
1059	struct vt_notifier_param param;
1060	struct vc_data *vc;
1061	int err;
1062
1063	WARN_CONSOLE_UNLOCKED();
1064
1065	if (currcons >= MAX_NR_CONSOLES)
1066	return -ENXIO;
1067
1068	if (vc_cons[currcons].d)
1069	return 0;
1070
1071	/* due to the granularity of kmalloc, we waste some memory here */
1072	/* the alloc is done in two steps, to optimize the common situation
1073	of a 25x80 console (structsize=216, screenbuf_size=4000) */
1074	/* although the numbers above are not valid since long ago, the
1075	point is still up-to-date and the comment still has its value
1076	even if only as a historical artifact. --mj, July 1998 */
1077	param.vc = vc = kzalloc(size: sizeof(struct vc_data), GFP_KERNEL);
1078	if (!vc)
1079	return -ENOMEM;
1080
1081	vc_cons[currcons].d = vc;
1082	tty_port_init(port: &vc->port);
1083	vc->port.ops = &vc_port_ops;
1084	INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1085
1086	visual_init(vc, num: currcons, init: 1);
1087
1088	if (!*vc->uni_pagedict_loc)
1089	con_set_default_unimap(vc);
1090
1091	err = -EINVAL;
1092	if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1093	vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1094	goto err_free;
1095	err = -ENOMEM;
1096	vc->vc_screenbuf = kzalloc(size: vc->vc_screenbuf_size, GFP_KERNEL);
1097	if (!vc->vc_screenbuf)
1098	goto err_free;
1099
1100	/* If no drivers have overridden us and the user didn't pass a
1101	boot option, default to displaying the cursor */
1102	if (global_cursor_default == -1)
1103	global_cursor_default = 1;
1104
1105	vc_init(vc, do_clear: 1);
1106	vcs_make_sysfs(index: currcons);
1107	atomic_notifier_call_chain(nh: &vt_notifier_list, VT_ALLOCATE, v: &param);
1108
1109	return 0;
1110	err_free:
1111	visual_deinit(vc);
1112	kfree(objp: vc);
1113	vc_cons[currcons].d = NULL;
1114	return err;
1115	}
1116
1117	static inline int resize_screen(struct vc_data *vc, int width, int height,
1118	int user)
1119	{
1120	/* Resizes the resolution of the display adapater */
1121	int err = 0;
1122
1123	if (vc->vc_sw->con_resize)
1124	err = vc->vc_sw->con_resize(vc, width, height, user);
1125
1126	return err;
1127	}
1128
1129	/**
1130	* vc_do_resize - resizing method for the tty
1131	* @tty: tty being resized
1132	* @vc: virtual console private data
1133	* @cols: columns
1134	* @lines: lines
1135	*
1136	* Resize a virtual console, clipping according to the actual constraints.
1137	* If the caller passes a tty structure then update the termios winsize
1138	* information and perform any necessary signal handling.
1139	*
1140	* Caller must hold the console semaphore. Takes the termios rwsem and
1141	* ctrl.lock of the tty IFF a tty is passed.
1142	*/
1143
1144	static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1145	unsigned int cols, unsigned int lines)
1146	{
1147	unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1148	unsigned long end;
1149	unsigned int old_rows, old_row_size, first_copied_row;
1150	unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1151	unsigned int user;
1152	unsigned short *oldscreen, *newscreen;
1153	u32 **new_uniscr = NULL;
1154
1155	WARN_CONSOLE_UNLOCKED();
1156
1157	if (!vc)
1158	return -ENXIO;
1159
1160	user = vc->vc_resize_user;
1161	vc->vc_resize_user = 0;
1162
1163	if (cols > VC_MAXCOL || lines > VC_MAXROW)
1164	return -EINVAL;
1165
1166	new_cols = (cols ? cols : vc->vc_cols);
1167	new_rows = (lines ? lines : vc->vc_rows);
1168	new_row_size = new_cols << 1;
1169	new_screen_size = new_row_size * new_rows;
1170
1171	if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1172	/*
1173	* This function is being called here to cover the case
1174	* where the userspace calls the FBIOPUT_VSCREENINFO twice,
1175	* passing the same fb_var_screeninfo containing the fields
1176	* yres/xres equal to a number non-multiple of vc_font.height
1177	* and yres_virtual/xres_virtual equal to number lesser than the
1178	* vc_font.height and yres/xres.
1179	* In the second call, the struct fb_var_screeninfo isn't
1180	* being modified by the underlying driver because of the
1181	* if above, and this causes the fbcon_display->vrows to become
1182	* negative and it eventually leads to out-of-bound
1183	* access by the imageblit function.
1184	* To give the correct values to the struct and to not have
1185	* to deal with possible errors from the code below, we call
1186	* the resize_screen here as well.
1187	*/
1188	return resize_screen(vc, width: new_cols, height: new_rows, user);
1189	}
1190
1191	if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1192	return -EINVAL;
1193	newscreen = kzalloc(size: new_screen_size, GFP_USER);
1194	if (!newscreen)
1195	return -ENOMEM;
1196
1197	if (vc->vc_uni_lines) {
1198	new_uniscr = vc_uniscr_alloc(cols: new_cols, rows: new_rows);
1199	if (!new_uniscr) {
1200	kfree(objp: newscreen);
1201	return -ENOMEM;
1202	}
1203	}
1204
1205	if (vc_is_sel(vc))
1206	clear_selection();
1207
1208	old_rows = vc->vc_rows;
1209	old_row_size = vc->vc_size_row;
1210
1211	err = resize_screen(vc, width: new_cols, height: new_rows, user);
1212	if (err) {
1213	kfree(objp: newscreen);
1214	vc_uniscr_free(uni_lines: new_uniscr);
1215	return err;
1216	}
1217
1218	vc->vc_rows = new_rows;
1219	vc->vc_cols = new_cols;
1220	vc->vc_size_row = new_row_size;
1221	vc->vc_screenbuf_size = new_screen_size;
1222
1223	rlth = min(old_row_size, new_row_size);
1224	rrem = new_row_size - rlth;
1225	old_origin = vc->vc_origin;
1226	new_origin = (long) newscreen;
1227	new_scr_end = new_origin + new_screen_size;
1228
1229	if (vc->state.y > new_rows) {
1230	if (old_rows - vc->state.y < new_rows) {
1231	/*
1232	* Cursor near the bottom, copy contents from the
1233	* bottom of buffer
1234	*/
1235	first_copied_row = (old_rows - new_rows);
1236	} else {
1237	/*
1238	* Cursor is in no man's land, copy 1/2 screenful
1239	* from the top and bottom of cursor position
1240	*/
1241	first_copied_row = (vc->state.y - new_rows/2);
1242	}
1243	old_origin += first_copied_row * old_row_size;
1244	} else
1245	first_copied_row = 0;
1246	end = old_origin + old_row_size * min(old_rows, new_rows);
1247
1248	vc_uniscr_copy_area(dst_lines: new_uniscr, dst_cols: new_cols, dst_rows: new_rows,
1249	src_lines: vc->vc_uni_lines, src_cols: rlth/2, src_top_row: first_copied_row,
1250	min(old_rows, new_rows));
1251	vc_uniscr_set(vc, new_uni_lines: new_uniscr);
1252
1253	update_attr(vc);
1254
1255	while (old_origin < end) {
1256	scr_memcpyw(d: (unsigned short *) new_origin,
1257	s: (unsigned short *) old_origin, count: rlth);
1258	if (rrem)
1259	scr_memsetw(s: (void *)(new_origin + rlth),
1260	c: vc->vc_video_erase_char, count: rrem);
1261	old_origin += old_row_size;
1262	new_origin += new_row_size;
1263	}
1264	if (new_scr_end > new_origin)
1265	scr_memsetw(s: (void *)new_origin, c: vc->vc_video_erase_char,
1266	count: new_scr_end - new_origin);
1267	oldscreen = vc->vc_screenbuf;
1268	vc->vc_screenbuf = newscreen;
1269	vc->vc_screenbuf_size = new_screen_size;
1270	set_origin(vc);
1271	kfree(objp: oldscreen);
1272
1273	/* do part of a reset_terminal() */
1274	vc->vc_top = 0;
1275	vc->vc_bottom = vc->vc_rows;
1276	gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y);
1277	save_cur(vc);
1278
1279	if (tty) {
1280	/* Rewrite the requested winsize data with the actual
1281	resulting sizes */
1282	struct winsize ws;
1283	memset(&ws, 0, sizeof(ws));
1284	ws.ws_row = vc->vc_rows;
1285	ws.ws_col = vc->vc_cols;
1286	ws.ws_ypixel = vc->vc_scan_lines;
1287	tty_do_resize(tty, ws: &ws);
1288	}
1289
1290	if (con_is_visible(vc))
1291	update_screen(vc);
1292	vt_event_post(VT_EVENT_RESIZE, old: vc->vc_num, new: vc->vc_num);
1293	notify_update(vc);
1294	return err;
1295	}
1296
1297	/**
1298	* vc_resize - resize a VT
1299	* @vc: virtual console
1300	* @cols: columns
1301	* @rows: rows
1302	*
1303	* Resize a virtual console as seen from the console end of things. We
1304	* use the common vc_do_resize methods to update the structures. The
1305	* caller must hold the console sem to protect console internals and
1306	* vc->port.tty
1307	*/
1308
1309	int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1310	{
1311	return vc_do_resize(tty: vc->port.tty, vc, cols, lines: rows);
1312	}
1313	EXPORT_SYMBOL(vc_resize);
1314
1315	/**
1316	* vt_resize - resize a VT
1317	* @tty: tty to resize
1318	* @ws: winsize attributes
1319	*
1320	* Resize a virtual terminal. This is called by the tty layer as we
1321	* register our own handler for resizing. The mutual helper does all
1322	* the actual work.
1323	*
1324	* Takes the console sem and the called methods then take the tty
1325	* termios_rwsem and the tty ctrl.lock in that order.
1326	*/
1327	static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1328	{
1329	struct vc_data *vc = tty->driver_data;
1330	int ret;
1331
1332	console_lock();
1333	ret = vc_do_resize(tty, vc, cols: ws->ws_col, lines: ws->ws_row);
1334	console_unlock();
1335	return ret;
1336	}
1337
1338	struct vc_data *vc_deallocate(unsigned int currcons)
1339	{
1340	struct vc_data *vc = NULL;
1341
1342	WARN_CONSOLE_UNLOCKED();
1343
1344	if (vc_cons_allocated(i: currcons)) {
1345	struct vt_notifier_param param;
1346
1347	param.vc = vc = vc_cons[currcons].d;
1348	atomic_notifier_call_chain(nh: &vt_notifier_list, VT_DEALLOCATE, v: &param);
1349	vcs_remove_sysfs(index: currcons);
1350	visual_deinit(vc);
1351	con_free_unimap(vc);
1352	put_pid(pid: vc->vt_pid);
1353	vc_uniscr_set(vc, NULL);
1354	kfree(objp: vc->vc_screenbuf);
1355	vc_cons[currcons].d = NULL;
1356	}
1357	return vc;
1358	}
1359
1360	/*
1361	* VT102 emulator
1362	*/
1363
1364	enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1365
1366	#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1367	#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1368	#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1369
1370	#define decarm VC_REPEAT
1371	#define decckm VC_CKMODE
1372	#define kbdapplic VC_APPLIC
1373	#define lnm VC_CRLF
1374
1375	const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1376	8,12,10,14, 9,13,11,15 };
1377	EXPORT_SYMBOL(color_table);
1378
1379	/* the default colour table, for VGA+ colour systems */
1380	unsigned char default_red[] = {
1381	0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1382	0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1383	};
1384	module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1385	EXPORT_SYMBOL(default_red);
1386
1387	unsigned char default_grn[] = {
1388	0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1389	0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1390	};
1391	module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1392	EXPORT_SYMBOL(default_grn);
1393
1394	unsigned char default_blu[] = {
1395	0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1396	0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1397	};
1398	module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1399	EXPORT_SYMBOL(default_blu);
1400
1401	/*
1402	* gotoxy() must verify all boundaries, because the arguments
1403	* might also be negative. If the given position is out of
1404	* bounds, the cursor is placed at the nearest margin.
1405	*/
1406	static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1407	{
1408	int min_y, max_y;
1409
1410	if (new_x < 0)
1411	vc->state.x = 0;
1412	else {
1413	if (new_x >= vc->vc_cols)
1414	vc->state.x = vc->vc_cols - 1;
1415	else
1416	vc->state.x = new_x;
1417	}
1418
1419	if (vc->vc_decom) {
1420	min_y = vc->vc_top;
1421	max_y = vc->vc_bottom;
1422	} else {
1423	min_y = 0;
1424	max_y = vc->vc_rows;
1425	}
1426	if (new_y < min_y)
1427	vc->state.y = min_y;
1428	else if (new_y >= max_y)
1429	vc->state.y = max_y - 1;
1430	else
1431	vc->state.y = new_y;
1432	vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1433	(vc->state.x << 1);
1434	vc->vc_need_wrap = 0;
1435	}
1436
1437	/* for absolute user moves, when decom is set */
1438	static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1439	{
1440	gotoxy(vc, new_x, new_y: vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1441	}
1442
1443	void scrollback(struct vc_data *vc)
1444	{
1445	scrolldelta(lines: -(vc->vc_rows / 2));
1446	}
1447
1448	void scrollfront(struct vc_data *vc, int lines)
1449	{
1450	if (!lines)
1451	lines = vc->vc_rows / 2;
1452	scrolldelta(lines);
1453	}
1454
1455	static void lf(struct vc_data *vc)
1456	{
1457	/* don't scroll if above bottom of scrolling region, or
1458	* if below scrolling region
1459	*/
1460	if (vc->state.y + 1 == vc->vc_bottom)
1461	con_scroll(vc, top: vc->vc_top, bottom: vc->vc_bottom, dir: SM_UP, nr: 1);
1462	else if (vc->state.y < vc->vc_rows - 1) {
1463	vc->state.y++;
1464	vc->vc_pos += vc->vc_size_row;
1465	}
1466	vc->vc_need_wrap = 0;
1467	notify_write(vc, unicode: '\n');
1468	}
1469
1470	static void ri(struct vc_data *vc)
1471	{
1472	/* don't scroll if below top of scrolling region, or
1473	* if above scrolling region
1474	*/
1475	if (vc->state.y == vc->vc_top)
1476	con_scroll(vc, top: vc->vc_top, bottom: vc->vc_bottom, dir: SM_DOWN, nr: 1);
1477	else if (vc->state.y > 0) {
1478	vc->state.y--;
1479	vc->vc_pos -= vc->vc_size_row;
1480	}
1481	vc->vc_need_wrap = 0;
1482	}
1483
1484	static inline void cr(struct vc_data *vc)
1485	{
1486	vc->vc_pos -= vc->state.x << 1;
1487	vc->vc_need_wrap = vc->state.x = 0;
1488	notify_write(vc, unicode: '\r');
1489	}
1490
1491	static inline void bs(struct vc_data *vc)
1492	{
1493	if (vc->state.x) {
1494	vc->vc_pos -= 2;
1495	vc->state.x--;
1496	vc->vc_need_wrap = 0;
1497	notify_write(vc, unicode: '\b');
1498	}
1499	}
1500
1501	static inline void del(struct vc_data *vc)
1502	{
1503	/* ignored */
1504	}
1505
1506	static void csi_J(struct vc_data *vc, int vpar)
1507	{
1508	unsigned int count;
1509	unsigned short * start;
1510
1511	switch (vpar) {
1512	case 0: /* erase from cursor to end of display */
1513	vc_uniscr_clear_line(vc, x: vc->state.x,
1514	nr: vc->vc_cols - vc->state.x);
1515	vc_uniscr_clear_lines(vc, y: vc->state.y + 1,
1516	nr: vc->vc_rows - vc->state.y - 1);
1517	count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1518	start = (unsigned short *)vc->vc_pos;
1519	break;
1520	case 1: /* erase from start to cursor */
1521	vc_uniscr_clear_line(vc, x: 0, nr: vc->state.x + 1);
1522	vc_uniscr_clear_lines(vc, y: 0, nr: vc->state.y);
1523	count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1524	start = (unsigned short *)vc->vc_origin;
1525	break;
1526	case 3: /* include scrollback */
1527	flush_scrollback(vc);
1528	fallthrough;
1529	case 2: /* erase whole display */
1530	vc_uniscr_clear_lines(vc, y: 0, nr: vc->vc_rows);
1531	count = vc->vc_cols * vc->vc_rows;
1532	start = (unsigned short *)vc->vc_origin;
1533	break;
1534	default:
1535	return;
1536	}
1537	scr_memsetw(s: start, c: vc->vc_video_erase_char, count: 2 * count);
1538	if (con_should_update(vc))
1539	do_update_region(vc, start: (unsigned long) start, count);
1540	vc->vc_need_wrap = 0;
1541	}
1542
1543	static void csi_K(struct vc_data *vc, int vpar)
1544	{
1545	unsigned int count;
1546	unsigned short *start = (unsigned short *)vc->vc_pos;
1547	int offset;
1548
1549	switch (vpar) {
1550	case 0: /* erase from cursor to end of line */
1551	offset = 0;
1552	count = vc->vc_cols - vc->state.x;
1553	break;
1554	case 1: /* erase from start of line to cursor */
1555	offset = -vc->state.x;
1556	count = vc->state.x + 1;
1557	break;
1558	case 2: /* erase whole line */
1559	offset = -vc->state.x;
1560	count = vc->vc_cols;
1561	break;
1562	default:
1563	return;
1564	}
1565	vc_uniscr_clear_line(vc, x: vc->state.x + offset, nr: count);
1566	scr_memsetw(s: start + offset, c: vc->vc_video_erase_char, count: 2 * count);
1567	vc->vc_need_wrap = 0;
1568	if (con_should_update(vc))
1569	do_update_region(vc, start: (unsigned long)(start + offset), count);
1570	}
1571
1572	/* erase the following vpar positions */
1573	static void csi_X(struct vc_data *vc, unsigned int vpar)
1574	{ /* not vt100? */
1575	unsigned int count;
1576
1577	if (!vpar)
1578	vpar++;
1579
1580	count = min(vpar, vc->vc_cols - vc->state.x);
1581
1582	vc_uniscr_clear_line(vc, x: vc->state.x, nr: count);
1583	scr_memsetw(s: (unsigned short *)vc->vc_pos, c: vc->vc_video_erase_char, count: 2 * count);
1584	if (con_should_update(vc))
1585	vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1586	vc->vc_need_wrap = 0;
1587	}
1588
1589	static void default_attr(struct vc_data *vc)
1590	{
1591	vc->state.intensity = VCI_NORMAL;
1592	vc->state.italic = false;
1593	vc->state.underline = false;
1594	vc->state.reverse = false;
1595	vc->state.blink = false;
1596	vc->state.color = vc->vc_def_color;
1597	}
1598
1599	struct rgb { u8 r; u8 g; u8 b; };
1600
1601	static void rgb_from_256(int i, struct rgb *c)
1602	{
1603	if (i < 8) { /* Standard colours. */
1604	c->r = i&1 ? 0xaa : 0x00;
1605	c->g = i&2 ? 0xaa : 0x00;
1606	c->b = i&4 ? 0xaa : 0x00;
1607	} else if (i < 16) {
1608	c->r = i&1 ? 0xff : 0x55;
1609	c->g = i&2 ? 0xff : 0x55;
1610	c->b = i&4 ? 0xff : 0x55;
1611	} else if (i < 232) { /* 6x6x6 colour cube. */
1612	c->r = (i - 16) / 36 * 85 / 2;
1613	c->g = (i - 16) / 6 % 6 * 85 / 2;
1614	c->b = (i - 16) % 6 * 85 / 2;
1615	} else /* Grayscale ramp. */
1616	c->r = c->g = c->b = i * 10 - 2312;
1617	}
1618
1619	static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1620	{
1621	u8 hue = 0, max = max3(c->r, c->g, c->b);
1622
1623	if (c->r > max / 2)
1624	hue |= 4;
1625	if (c->g > max / 2)
1626	hue |= 2;
1627	if (c->b > max / 2)
1628	hue |= 1;
1629
1630	if (hue == 7 && max <= 0x55) {
1631	hue = 0;
1632	vc->state.intensity = VCI_BOLD;
1633	} else if (max > 0xaa)
1634	vc->state.intensity = VCI_BOLD;
1635	else
1636	vc->state.intensity = VCI_NORMAL;
1637
1638	vc->state.color = (vc->state.color & 0xf0) | hue;
1639	}
1640
1641	static void rgb_background(struct vc_data *vc, const struct rgb *c)
1642	{
1643	/* For backgrounds, err on the dark side. */
1644	vc->state.color = (vc->state.color & 0x0f)
1645	| (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1646	}
1647
1648	/*
1649	* ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1650	* and thus need to be detected and ignored by hand. That standard also
1651	* wants : rather than ; as separators but sequences containing : are currently
1652	* completely ignored by the parser.
1653	*
1654	* Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1655	* supporting them.
1656	*/
1657	static int vc_t416_color(struct vc_data *vc, int i,
1658	void(*set_color)(struct vc_data *vc, const struct rgb *c))
1659	{
1660	struct rgb c;
1661
1662	i++;
1663	if (i > vc->vc_npar)
1664	return i;
1665
1666	if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1667	/* 256 colours */
1668	i++;
1669	rgb_from_256(i: vc->vc_par[i], c: &c);
1670	} else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1671	/* 24 bit */
1672	c.r = vc->vc_par[i + 1];
1673	c.g = vc->vc_par[i + 2];
1674	c.b = vc->vc_par[i + 3];
1675	i += 3;
1676	} else
1677	return i;
1678
1679	set_color(vc, &c);
1680
1681	return i;
1682	}
1683
1684	/* console_lock is held */
1685	static void csi_m(struct vc_data *vc)
1686	{
1687	int i;
1688
1689	for (i = 0; i <= vc->vc_npar; i++)
1690	switch (vc->vc_par[i]) {
1691	case 0: /* all attributes off */
1692	default_attr(vc);
1693	break;
1694	case 1:
1695	vc->state.intensity = VCI_BOLD;
1696	break;
1697	case 2:
1698	vc->state.intensity = VCI_HALF_BRIGHT;
1699	break;
1700	case 3:
1701	vc->state.italic = true;
1702	break;
1703	case 21:
1704	/*
1705	* No console drivers support double underline, so
1706	* convert it to a single underline.
1707	*/
1708	case 4:
1709	vc->state.underline = true;
1710	break;
1711	case 5:
1712	vc->state.blink = true;
1713	break;
1714	case 7:
1715	vc->state.reverse = true;
1716	break;
1717	case 10: /* ANSI X3.64-1979 (SCO-ish?)
1718	* Select primary font, don't display control chars if
1719	* defined, don't set bit 8 on output.
1720	*/
1721	vc->vc_translate = set_translate(m: vc->state.Gx_charset[vc->state.charset], vc);
1722	vc->vc_disp_ctrl = 0;
1723	vc->vc_toggle_meta = 0;
1724	break;
1725	case 11: /* ANSI X3.64-1979 (SCO-ish?)
1726	* Select first alternate font, lets chars < 32 be
1727	* displayed as ROM chars.
1728	*/
1729	vc->vc_translate = set_translate(m: IBMPC_MAP, vc);
1730	vc->vc_disp_ctrl = 1;
1731	vc->vc_toggle_meta = 0;
1732	break;
1733	case 12: /* ANSI X3.64-1979 (SCO-ish?)
1734	* Select second alternate font, toggle high bit
1735	* before displaying as ROM char.
1736	*/
1737	vc->vc_translate = set_translate(m: IBMPC_MAP, vc);
1738	vc->vc_disp_ctrl = 1;
1739	vc->vc_toggle_meta = 1;
1740	break;
1741	case 22:
1742	vc->state.intensity = VCI_NORMAL;
1743	break;
1744	case 23:
1745	vc->state.italic = false;
1746	break;
1747	case 24:
1748	vc->state.underline = false;
1749	break;
1750	case 25:
1751	vc->state.blink = false;
1752	break;
1753	case 27:
1754	vc->state.reverse = false;
1755	break;
1756	case 38:
1757	i = vc_t416_color(vc, i, set_color: rgb_foreground);
1758	break;
1759	case 48:
1760	i = vc_t416_color(vc, i, set_color: rgb_background);
1761	break;
1762	case 39:
1763	vc->state.color = (vc->vc_def_color & 0x0f) |
1764	(vc->state.color & 0xf0);
1765	break;
1766	case 49:
1767	vc->state.color = (vc->vc_def_color & 0xf0) |
1768	(vc->state.color & 0x0f);
1769	break;
1770	default:
1771	if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1772	if (vc->vc_par[i] < 100)
1773	vc->state.intensity = VCI_BOLD;
1774	vc->vc_par[i] -= 60;
1775	}
1776	if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1777	vc->state.color = color_table[vc->vc_par[i] - 30]
1778	| (vc->state.color & 0xf0);
1779	else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1780	vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1781	| (vc->state.color & 0x0f);
1782	break;
1783	}
1784	update_attr(vc);
1785	}
1786
1787	static void respond_string(const char *p, size_t len, struct tty_port *port)
1788	{
1789	tty_insert_flip_string(port, chars: p, size: len);
1790	tty_flip_buffer_push(port);
1791	}
1792
1793	static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1794	{
1795	char buf[40];
1796	int len;
1797
1798	len = sprintf(buf, fmt: "\033[%d;%dR", vc->state.y +
1799	(vc->vc_decom ? vc->vc_top + 1 : 1),
1800	vc->state.x + 1);
1801	respond_string(p: buf, len, port: tty->port);
1802	}
1803
1804	static inline void status_report(struct tty_struct *tty)
1805	{
1806	static const char teminal_ok[] = "\033[0n";
1807
1808	respond_string(p: teminal_ok, strlen(teminal_ok), port: tty->port);
1809	}
1810
1811	static inline void respond_ID(struct tty_struct *tty)
1812	{
1813	/* terminal answer to an ESC-Z or csi0c query. */
1814	static const char vt102_id[] = "\033[?6c";
1815
1816	respond_string(p: vt102_id, strlen(vt102_id), port: tty->port);
1817	}
1818
1819	void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1820	{
1821	char buf[8];
1822	int len;
1823
1824	len = sprintf(buf, fmt: "\033[M%c%c%c", (char)(' ' + butt),
1825	(char)('!' + mrx), (char)('!' + mry));
1826	respond_string(p: buf, len, port: tty->port);
1827	}
1828
1829	/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1830	int mouse_reporting(void)
1831	{
1832	return vc_cons[fg_console].d->vc_report_mouse;
1833	}
1834
1835	/* console_lock is held */
1836	static void set_mode(struct vc_data *vc, int on_off)
1837	{
1838	int i;
1839
1840	for (i = 0; i <= vc->vc_npar; i++)
1841	if (vc->vc_priv == EPdec) {
1842	switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1843	case 1: /* Cursor keys send ^[Ox/^[[x */
1844	if (on_off)
1845	set_kbd(vc, decckm);
1846	else
1847	clr_kbd(vc, decckm);
1848	break;
1849	case 3: /* 80/132 mode switch unimplemented */
1850	#if 0
1851	vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1852	/* this alone does not suffice; some user mode
1853	utility has to change the hardware regs */
1854	#endif
1855	break;
1856	case 5: /* Inverted screen on/off */
1857	if (vc->vc_decscnm != on_off) {
1858	vc->vc_decscnm = on_off;
1859	invert_screen(vc, offset: 0,
1860	count: vc->vc_screenbuf_size,
1861	viewed: false);
1862	update_attr(vc);
1863	}
1864	break;
1865	case 6: /* Origin relative/absolute */
1866	vc->vc_decom = on_off;
1867	gotoxay(vc, new_x: 0, new_y: 0);
1868	break;
1869	case 7: /* Autowrap on/off */
1870	vc->vc_decawm = on_off;
1871	break;
1872	case 8: /* Autorepeat on/off */
1873	if (on_off)
1874	set_kbd(vc, decarm);
1875	else
1876	clr_kbd(vc, decarm);
1877	break;
1878	case 9:
1879	vc->vc_report_mouse = on_off ? 1 : 0;
1880	break;
1881	case 25: /* Cursor on/off */
1882	vc->vc_deccm = on_off;
1883	break;
1884	case 1000:
1885	vc->vc_report_mouse = on_off ? 2 : 0;
1886	break;
1887	}
1888	} else {
1889	switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1890	case 3: /* Monitor (display ctrls) */
1891	vc->vc_disp_ctrl = on_off;
1892	break;
1893	case 4: /* Insert Mode on/off */
1894	vc->vc_decim = on_off;
1895	break;
1896	case 20: /* Lf, Enter == CrLf/Lf */
1897	if (on_off)
1898	set_kbd(vc, lnm);
1899	else
1900	clr_kbd(vc, lnm);
1901	break;
1902	}
1903	}
1904	}
1905
1906	/* console_lock is held */
1907	static void setterm_command(struct vc_data *vc)
1908	{
1909	switch (vc->vc_par[0]) {
1910	case 1: /* set color for underline mode */
1911	if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1912	vc->vc_ulcolor = color_table[vc->vc_par[1]];
1913	if (vc->state.underline)
1914	update_attr(vc);
1915	}
1916	break;
1917	case 2: /* set color for half intensity mode */
1918	if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1919	vc->vc_halfcolor = color_table[vc->vc_par[1]];
1920	if (vc->state.intensity == VCI_HALF_BRIGHT)
1921	update_attr(vc);
1922	}
1923	break;
1924	case 8: /* store colors as defaults */
1925	vc->vc_def_color = vc->vc_attr;
1926	if (vc->vc_hi_font_mask == 0x100)
1927	vc->vc_def_color >>= 1;
1928	default_attr(vc);
1929	update_attr(vc);
1930	break;
1931	case 9: /* set blanking interval */
1932	blankinterval = min(vc->vc_par[1], 60U) * 60;
1933	poke_blanked_console();
1934	break;
1935	case 10: /* set bell frequency in Hz */
1936	if (vc->vc_npar >= 1)
1937	vc->vc_bell_pitch = vc->vc_par[1];
1938	else
1939	vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1940	break;
1941	case 11: /* set bell duration in msec */
1942	if (vc->vc_npar >= 1)
1943	vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1944	msecs_to_jiffies(m: vc->vc_par[1]) : 0;
1945	else
1946	vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1947	break;
1948	case 12: /* bring specified console to the front */
1949	if (vc->vc_par[1] >= 1 && vc_cons_allocated(i: vc->vc_par[1] - 1))
1950	set_console(vc->vc_par[1] - 1);
1951	break;
1952	case 13: /* unblank the screen */
1953	poke_blanked_console();
1954	break;
1955	case 14: /* set vesa powerdown interval */
1956	vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1957	break;
1958	case 15: /* activate the previous console */
1959	set_console(last_console);
1960	break;
1961	case 16: /* set cursor blink duration in msec */
1962	if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1963	vc->vc_par[1] <= USHRT_MAX)
1964	vc->vc_cur_blink_ms = vc->vc_par[1];
1965	else
1966	vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1967	break;
1968	}
1969	}
1970
1971	/* console_lock is held */
1972	static void csi_at(struct vc_data *vc, unsigned int nr)
1973	{
1974	if (nr > vc->vc_cols - vc->state.x)
1975	nr = vc->vc_cols - vc->state.x;
1976	else if (!nr)
1977	nr = 1;
1978	insert_char(vc, nr);
1979	}
1980
1981	/* console_lock is held */
1982	static void csi_L(struct vc_data *vc, unsigned int nr)
1983	{
1984	if (nr > vc->vc_rows - vc->state.y)
1985	nr = vc->vc_rows - vc->state.y;
1986	else if (!nr)
1987	nr = 1;
1988	con_scroll(vc, top: vc->state.y, bottom: vc->vc_bottom, dir: SM_DOWN, nr);
1989	vc->vc_need_wrap = 0;
1990	}
1991
1992	/* console_lock is held */
1993	static void csi_P(struct vc_data *vc, unsigned int nr)
1994	{
1995	if (nr > vc->vc_cols - vc->state.x)
1996	nr = vc->vc_cols - vc->state.x;
1997	else if (!nr)
1998	nr = 1;
1999	delete_char(vc, nr);
2000	}
2001
2002	/* console_lock is held */
2003	static void csi_M(struct vc_data *vc, unsigned int nr)
2004	{
2005	if (nr > vc->vc_rows - vc->state.y)
2006	nr = vc->vc_rows - vc->state.y;
2007	else if (!nr)
2008	nr=1;
2009	con_scroll(vc, top: vc->state.y, bottom: vc->vc_bottom, dir: SM_UP, nr);
2010	vc->vc_need_wrap = 0;
2011	}
2012
2013	/* console_lock is held (except via vc_init->reset_terminal */
2014	static void save_cur(struct vc_data *vc)
2015	{
2016	memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2017	}
2018
2019	/* console_lock is held */
2020	static void restore_cur(struct vc_data *vc)
2021	{
2022	memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2023
2024	gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y);
2025	vc->vc_translate = set_translate(m: vc->state.Gx_charset[vc->state.charset],
2026	vc);
2027	update_attr(vc);
2028	vc->vc_need_wrap = 0;
2029	}
2030
2031	enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2032	EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2033	ESpalette, ESosc, ESapc, ESpm, ESdcs };
2034
2035	/* console_lock is held (except via vc_init()) */
2036	static void reset_terminal(struct vc_data *vc, int do_clear)
2037	{
2038	unsigned int i;
2039
2040	vc->vc_top = 0;
2041	vc->vc_bottom = vc->vc_rows;
2042	vc->vc_state = ESnormal;
2043	vc->vc_priv = EPecma;
2044	vc->vc_translate = set_translate(m: LAT1_MAP, vc);
2045	vc->state.Gx_charset[0] = LAT1_MAP;
2046	vc->state.Gx_charset[1] = GRAF_MAP;
2047	vc->state.charset = 0;
2048	vc->vc_need_wrap = 0;
2049	vc->vc_report_mouse = 0;
2050	vc->vc_utf = default_utf8;
2051	vc->vc_utf_count = 0;
2052
2053	vc->vc_disp_ctrl = 0;
2054	vc->vc_toggle_meta = 0;
2055
2056	vc->vc_decscnm = 0;
2057	vc->vc_decom = 0;
2058	vc->vc_decawm = 1;
2059	vc->vc_deccm = global_cursor_default;
2060	vc->vc_decim = 0;
2061
2062	vt_reset_keyboard(console: vc->vc_num);
2063
2064	vc->vc_cursor_type = cur_default;
2065	vc->vc_complement_mask = vc->vc_s_complement_mask;
2066
2067	default_attr(vc);
2068	update_attr(vc);
2069
2070	bitmap_zero(dst: vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2071	for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2072	set_bit(nr: i, addr: vc->vc_tab_stop);
2073
2074	vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2075	vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2076	vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2077
2078	gotoxy(vc, new_x: 0, new_y: 0);
2079	save_cur(vc);
2080	if (do_clear)
2081	csi_J(vc, vpar: 2);
2082	}
2083
2084	static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2085	{
2086	unsigned char *charset = &vc->state.Gx_charset[which];
2087
2088	switch (c) {
2089	case '0':
2090	*charset = GRAF_MAP;
2091	break;
2092	case 'B':
2093	*charset = LAT1_MAP;
2094	break;
2095	case 'U':
2096	*charset = IBMPC_MAP;
2097	break;
2098	case 'K':
2099	*charset = USER_MAP;
2100	break;
2101	}
2102
2103	if (vc->state.charset == which)
2104	vc->vc_translate = set_translate(m: *charset, vc);
2105	}
2106
2107	/* is this state an ANSI control string? */
2108	static bool ansi_control_string(unsigned int state)
2109	{
2110	if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2111	return true;
2112	return false;
2113	}
2114
2115	/* console_lock is held */
2116	static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2117	{
2118	/*
2119	* Control characters can be used in the _middle_
2120	* of an escape sequence, aside from ANSI control strings.
2121	*/
2122	if (ansi_control_string(state: vc->vc_state) && c >= 8 && c <= 13)
2123	return;
2124	switch (c) {
2125	case 0:
2126	return;
2127	case 7:
2128	if (ansi_control_string(state: vc->vc_state))
2129	vc->vc_state = ESnormal;
2130	else if (vc->vc_bell_duration)
2131	kd_mksound(hz: vc->vc_bell_pitch, ticks: vc->vc_bell_duration);
2132	return;
2133	case 8:
2134	bs(vc);
2135	return;
2136	case 9:
2137	vc->vc_pos -= (vc->state.x << 1);
2138
2139	vc->state.x = find_next_bit(addr: vc->vc_tab_stop,
2140	min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2141	offset: vc->state.x + 1);
2142	if (vc->state.x >= VC_TABSTOPS_COUNT)
2143	vc->state.x = vc->vc_cols - 1;
2144
2145	vc->vc_pos += (vc->state.x << 1);
2146	notify_write(vc, unicode: '\t');
2147	return;
2148	case 10: case 11: case 12:
2149	lf(vc);
2150	if (!is_kbd(vc, lnm))
2151	return;
2152	fallthrough;
2153	case 13:
2154	cr(vc);
2155	return;
2156	case 14:
2157	vc->state.charset = 1;
2158	vc->vc_translate = set_translate(m: vc->state.Gx_charset[1], vc);
2159	vc->vc_disp_ctrl = 1;
2160	return;
2161	case 15:
2162	vc->state.charset = 0;
2163	vc->vc_translate = set_translate(m: vc->state.Gx_charset[0], vc);
2164	vc->vc_disp_ctrl = 0;
2165	return;
2166	case 24: case 26:
2167	vc->vc_state = ESnormal;
2168	return;
2169	case 27:
2170	vc->vc_state = ESesc;
2171	return;
2172	case 127:
2173	del(vc);
2174	return;
2175	case 128+27:
2176	vc->vc_state = ESsquare;
2177	return;
2178	}
2179	switch(vc->vc_state) {
2180	case ESesc:
2181	vc->vc_state = ESnormal;
2182	switch (c) {
2183	case '[':
2184	vc->vc_state = ESsquare;
2185	return;
2186	case ']':
2187	vc->vc_state = ESnonstd;
2188	return;
2189	case '_':
2190	vc->vc_state = ESapc;
2191	return;
2192	case '^':
2193	vc->vc_state = ESpm;
2194	return;
2195	case '%':
2196	vc->vc_state = ESpercent;
2197	return;
2198	case 'E':
2199	cr(vc);
2200	lf(vc);
2201	return;
2202	case 'M':
2203	ri(vc);
2204	return;
2205	case 'D':
2206	lf(vc);
2207	return;
2208	case 'H':
2209	if (vc->state.x < VC_TABSTOPS_COUNT)
2210	set_bit(nr: vc->state.x, addr: vc->vc_tab_stop);
2211	return;
2212	case 'P':
2213	vc->vc_state = ESdcs;
2214	return;
2215	case 'Z':
2216	respond_ID(tty);
2217	return;
2218	case '7':
2219	save_cur(vc);
2220	return;
2221	case '8':
2222	restore_cur(vc);
2223	return;
2224	case '(':
2225	vc->vc_state = ESsetG0;
2226	return;
2227	case ')':
2228	vc->vc_state = ESsetG1;
2229	return;
2230	case '#':
2231	vc->vc_state = EShash;
2232	return;
2233	case 'c':
2234	reset_terminal(vc, do_clear: 1);
2235	return;
2236	case '>': /* Numeric keypad */
2237	clr_kbd(vc, kbdapplic);
2238	return;
2239	case '=': /* Appl. keypad */
2240	set_kbd(vc, kbdapplic);
2241	return;
2242	}
2243	return;
2244	case ESnonstd:
2245	if (c=='P') { /* palette escape sequence */
2246	for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2247	vc->vc_par[vc->vc_npar] = 0;
2248	vc->vc_npar = 0;
2249	vc->vc_state = ESpalette;
2250	return;
2251	} else if (c=='R') { /* reset palette */
2252	reset_palette(vc);
2253	vc->vc_state = ESnormal;
2254	} else if (c>='0' && c<='9')
2255	vc->vc_state = ESosc;
2256	else
2257	vc->vc_state = ESnormal;
2258	return;
2259	case ESpalette:
2260	if (isxdigit(c)) {
2261	vc->vc_par[vc->vc_npar++] = hex_to_bin(ch: c);
2262	if (vc->vc_npar == 7) {
2263	int i = vc->vc_par[0] * 3, j = 1;
2264	vc->vc_palette[i] = 16 * vc->vc_par[j++];
2265	vc->vc_palette[i++] += vc->vc_par[j++];
2266	vc->vc_palette[i] = 16 * vc->vc_par[j++];
2267	vc->vc_palette[i++] += vc->vc_par[j++];
2268	vc->vc_palette[i] = 16 * vc->vc_par[j++];
2269	vc->vc_palette[i] += vc->vc_par[j];
2270	set_palette(vc);
2271	vc->vc_state = ESnormal;
2272	}
2273	} else
2274	vc->vc_state = ESnormal;
2275	return;
2276	case ESsquare:
2277	for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2278	vc->vc_par[vc->vc_npar] = 0;
2279	vc->vc_npar = 0;
2280	vc->vc_state = ESgetpars;
2281	if (c == '[') { /* Function key */
2282	vc->vc_state=ESfunckey;
2283	return;
2284	}
2285	switch (c) {
2286	case '?':
2287	vc->vc_priv = EPdec;
2288	return;
2289	case '>':
2290	vc->vc_priv = EPgt;
2291	return;
2292	case '=':
2293	vc->vc_priv = EPeq;
2294	return;
2295	case '<':
2296	vc->vc_priv = EPlt;
2297	return;
2298	}
2299	vc->vc_priv = EPecma;
2300	fallthrough;
2301	case ESgetpars:
2302	if (c == ';' && vc->vc_npar < NPAR - 1) {
2303	vc->vc_npar++;
2304	return;
2305	} else if (c>='0' && c<='9') {
2306	vc->vc_par[vc->vc_npar] *= 10;
2307	vc->vc_par[vc->vc_npar] += c - '0';
2308	return;
2309	}
2310	if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2311	vc->vc_state = EScsiignore;
2312	return;
2313	}
2314	vc->vc_state = ESnormal;
2315	switch(c) {
2316	case 'h':
2317	if (vc->vc_priv <= EPdec)
2318	set_mode(vc, on_off: 1);
2319	return;
2320	case 'l':
2321	if (vc->vc_priv <= EPdec)
2322	set_mode(vc, on_off: 0);
2323	return;
2324	case 'c':
2325	if (vc->vc_priv == EPdec) {
2326	if (vc->vc_par[0])
2327	vc->vc_cursor_type =
2328	CUR_MAKE(vc->vc_par[0],
2329	vc->vc_par[1],
2330	vc->vc_par[2]);
2331	else
2332	vc->vc_cursor_type = cur_default;
2333	return;
2334	}
2335	break;
2336	case 'm':
2337	if (vc->vc_priv == EPdec) {
2338	clear_selection();
2339	if (vc->vc_par[0])
2340	vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2341	else
2342	vc->vc_complement_mask = vc->vc_s_complement_mask;
2343	return;
2344	}
2345	break;
2346	case 'n':
2347	if (vc->vc_priv == EPecma) {
2348	if (vc->vc_par[0] == 5)
2349	status_report(tty);
2350	else if (vc->vc_par[0] == 6)
2351	cursor_report(vc, tty);
2352	}
2353	return;
2354	}
2355	if (vc->vc_priv != EPecma) {
2356	vc->vc_priv = EPecma;
2357	return;
2358	}
2359	switch(c) {
2360	case 'G': case '`':
2361	if (vc->vc_par[0])
2362	vc->vc_par[0]--;
2363	gotoxy(vc, new_x: vc->vc_par[0], new_y: vc->state.y);
2364	return;
2365	case 'A':
2366	if (!vc->vc_par[0])
2367	vc->vc_par[0]++;
2368	gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y - vc->vc_par[0]);
2369	return;
2370	case 'B': case 'e':
2371	if (!vc->vc_par[0])
2372	vc->vc_par[0]++;
2373	gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y + vc->vc_par[0]);
2374	return;
2375	case 'C': case 'a':
2376	if (!vc->vc_par[0])
2377	vc->vc_par[0]++;
2378	gotoxy(vc, new_x: vc->state.x + vc->vc_par[0], new_y: vc->state.y);
2379	return;
2380	case 'D':
2381	if (!vc->vc_par[0])
2382	vc->vc_par[0]++;
2383	gotoxy(vc, new_x: vc->state.x - vc->vc_par[0], new_y: vc->state.y);
2384	return;
2385	case 'E':
2386	if (!vc->vc_par[0])
2387	vc->vc_par[0]++;
2388	gotoxy(vc, new_x: 0, new_y: vc->state.y + vc->vc_par[0]);
2389	return;
2390	case 'F':
2391	if (!vc->vc_par[0])
2392	vc->vc_par[0]++;
2393	gotoxy(vc, new_x: 0, new_y: vc->state.y - vc->vc_par[0]);
2394	return;
2395	case 'd':
2396	if (vc->vc_par[0])
2397	vc->vc_par[0]--;
2398	gotoxay(vc, new_x: vc->state.x ,new_y: vc->vc_par[0]);
2399	return;
2400	case 'H': case 'f':
2401	if (vc->vc_par[0])
2402	vc->vc_par[0]--;
2403	if (vc->vc_par[1])
2404	vc->vc_par[1]--;
2405	gotoxay(vc, new_x: vc->vc_par[1], new_y: vc->vc_par[0]);
2406	return;
2407	case 'J':
2408	csi_J(vc, vpar: vc->vc_par[0]);
2409	return;
2410	case 'K':
2411	csi_K(vc, vpar: vc->vc_par[0]);
2412	return;
2413	case 'L':
2414	csi_L(vc, nr: vc->vc_par[0]);
2415	return;
2416	case 'M':
2417	csi_M(vc, nr: vc->vc_par[0]);
2418	return;
2419	case 'P':
2420	csi_P(vc, nr: vc->vc_par[0]);
2421	return;
2422	case 'c':
2423	if (!vc->vc_par[0])
2424	respond_ID(tty);
2425	return;
2426	case 'g':
2427	if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2428	set_bit(nr: vc->state.x, addr: vc->vc_tab_stop);
2429	else if (vc->vc_par[0] == 3)
2430	bitmap_zero(dst: vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2431	return;
2432	case 'm':
2433	csi_m(vc);
2434	return;
2435	case 'q': /* DECLL - but only 3 leds */
2436	/* map 0,1,2,3 to 0,1,2,4 */
2437	if (vc->vc_par[0] < 4)
2438	vt_set_led_state(console: vc->vc_num,
2439	leds: (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2440	return;
2441	case 'r':
2442	if (!vc->vc_par[0])
2443	vc->vc_par[0]++;
2444	if (!vc->vc_par[1])
2445	vc->vc_par[1] = vc->vc_rows;
2446	/* Minimum allowed region is 2 lines */
2447	if (vc->vc_par[0] < vc->vc_par[1] &&
2448	vc->vc_par[1] <= vc->vc_rows) {
2449	vc->vc_top = vc->vc_par[0] - 1;
2450	vc->vc_bottom = vc->vc_par[1];
2451	gotoxay(vc, new_x: 0, new_y: 0);
2452	}
2453	return;
2454	case 's':
2455	save_cur(vc);
2456	return;
2457	case 'u':
2458	restore_cur(vc);
2459	return;
2460	case 'X':
2461	csi_X(vc, vpar: vc->vc_par[0]);
2462	return;
2463	case '@':
2464	csi_at(vc, nr: vc->vc_par[0]);
2465	return;
2466	case ']': /* setterm functions */
2467	setterm_command(vc);
2468	return;
2469	}
2470	return;
2471	case EScsiignore:
2472	if (c >= 20 && c <= 0x3f)
2473	return;
2474	vc->vc_state = ESnormal;
2475	return;
2476	case ESpercent:
2477	vc->vc_state = ESnormal;
2478	switch (c) {
2479	case '@': /* defined in ISO 2022 */
2480	vc->vc_utf = 0;
2481	return;
2482	case 'G': /* prelim official escape code */
2483	case '8': /* retained for compatibility */
2484	vc->vc_utf = 1;
2485	return;
2486	}
2487	return;
2488	case ESfunckey:
2489	vc->vc_state = ESnormal;
2490	return;
2491	case EShash:
2492	vc->vc_state = ESnormal;
2493	if (c == '8') {
2494	/* DEC screen alignment test. kludge :-) */
2495	vc->vc_video_erase_char =
2496	(vc->vc_video_erase_char & 0xff00) | 'E';
2497	csi_J(vc, vpar: 2);
2498	vc->vc_video_erase_char =
2499	(vc->vc_video_erase_char & 0xff00) | ' ';
2500	do_update_region(vc, start: vc->vc_origin, count: vc->vc_screenbuf_size / 2);
2501	}
2502	return;
2503	case ESsetG0:
2504	vc_setGx(vc, which: 0, c);
2505	vc->vc_state = ESnormal;
2506	return;
2507	case ESsetG1:
2508	vc_setGx(vc, which: 1, c);
2509	vc->vc_state = ESnormal;
2510	return;
2511	case ESapc:
2512	return;
2513	case ESosc:
2514	return;
2515	case ESpm:
2516	return;
2517	case ESdcs:
2518	return;
2519	default:
2520	vc->vc_state = ESnormal;
2521	}
2522	}
2523
2524	/* is_double_width() is based on the wcwidth() implementation by
2525	* Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2526	* Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2527	*/
2528	struct interval {
2529	uint32_t first;
2530	uint32_t last;
2531	};
2532
2533	static int ucs_cmp(const void *key, const void *elt)
2534	{
2535	uint32_t ucs = *(uint32_t *)key;
2536	struct interval e = *(struct interval *) elt;
2537
2538	if (ucs > e.last)
2539	return 1;
2540	else if (ucs < e.first)
2541	return -1;
2542	return 0;
2543	}
2544
2545	static int is_double_width(uint32_t ucs)
2546	{
2547	static const struct interval double_width[] = {
2548	{ 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2549	{ 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2550	{ 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2551	{ 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2552	};
2553	if (ucs < double_width[0].first ||
2554	ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2555	return 0;
2556
2557	return bsearch(key: &ucs, base: double_width, ARRAY_SIZE(double_width),
2558	size: sizeof(struct interval), cmp: ucs_cmp) != NULL;
2559	}
2560
2561	struct vc_draw_region {
2562	unsigned long from, to;
2563	int x;
2564	};
2565
2566	static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2567	{
2568	if (draw->x < 0)
2569	return;
2570
2571	vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2572	(u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2573	draw->x);
2574	draw->x = -1;
2575	}
2576
2577	static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2578	{
2579	if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2580	if (vc->vc_toggle_meta)
2581	c |= 0x80;
2582
2583	return vc->vc_translate[c];
2584	}
2585
2586	return c;
2587	}
2588
2589
2590	/**
2591	* vc_sanitize_unicode - Replace invalid Unicode code points with U+FFFD
2592	* @c: the received character, or U+FFFD for invalid sequences.
2593	*/
2594	static inline int vc_sanitize_unicode(const int c)
2595	{
2596	if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2597	return 0xfffd;
2598
2599	return c;
2600	}
2601
2602	/**
2603	* vc_translate_unicode - Combine UTF-8 into Unicode in @vc_utf_char
2604	* @vc: virtual console
2605	* @c: character to translate
2606	* @rescan: we return true if we need more (continuation) data
2607	*
2608	* @vc_utf_char is the being-constructed unicode character.
2609	* @vc_utf_count is the number of continuation bytes still expected to arrive.
2610	* @vc_npar is the number of continuation bytes arrived so far.
2611	*/
2612	static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2613	{
2614	static const u32 utf8_length_changes[] = {
2615	0x0000007f, 0x000007ff, 0x0000ffff,
2616	0x001fffff, 0x03ffffff, 0x7fffffff
2617	};
2618
2619	/* Continuation byte received */
2620	if ((c & 0xc0) == 0x80) {
2621	/* Unexpected continuation byte? */
2622	if (!vc->vc_utf_count)
2623	return 0xfffd;
2624
2625	vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2626	vc->vc_npar++;
2627	if (--vc->vc_utf_count)
2628	goto need_more_bytes;
2629
2630	/* Got a whole character */
2631	c = vc->vc_utf_char;
2632	/* Reject overlong sequences */
2633	if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2634	c > utf8_length_changes[vc->vc_npar])
2635	return 0xfffd;
2636
2637	return vc_sanitize_unicode(c);
2638	}
2639
2640	/* Single ASCII byte or first byte of a sequence received */
2641	if (vc->vc_utf_count) {
2642	/* Continuation byte expected */
2643	*rescan = true;
2644	vc->vc_utf_count = 0;
2645	return 0xfffd;
2646	}
2647
2648	/* Nothing to do if an ASCII byte was received */
2649	if (c <= 0x7f)
2650	return c;
2651
2652	/* First byte of a multibyte sequence received */
2653	vc->vc_npar = 0;
2654	if ((c & 0xe0) == 0xc0) {
2655	vc->vc_utf_count = 1;
2656	vc->vc_utf_char = (c & 0x1f);
2657	} else if ((c & 0xf0) == 0xe0) {
2658	vc->vc_utf_count = 2;
2659	vc->vc_utf_char = (c & 0x0f);
2660	} else if ((c & 0xf8) == 0xf0) {
2661	vc->vc_utf_count = 3;
2662	vc->vc_utf_char = (c & 0x07);
2663	} else if ((c & 0xfc) == 0xf8) {
2664	vc->vc_utf_count = 4;
2665	vc->vc_utf_char = (c & 0x03);
2666	} else if ((c & 0xfe) == 0xfc) {
2667	vc->vc_utf_count = 5;
2668	vc->vc_utf_char = (c & 0x01);
2669	} else {
2670	/* 254 and 255 are invalid */
2671	return 0xfffd;
2672	}
2673
2674	need_more_bytes:
2675	return -1;
2676	}
2677
2678	static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2679	{
2680	/* Do no translation at all in control states */
2681	if (vc->vc_state != ESnormal)
2682	return *c;
2683
2684	if (vc->vc_utf && !vc->vc_disp_ctrl)
2685	return *c = vc_translate_unicode(vc, c: *c, rescan);
2686
2687	/* no utf or alternate charset mode */
2688	return vc_translate_ascii(vc, c: *c);
2689	}
2690
2691	static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2692	{
2693	if (!vc->vc_can_do_color)
2694	return vc->vc_attr ^ 0x08;
2695
2696	if (vc->vc_hi_font_mask == 0x100)
2697	return (vc->vc_attr & 0x11) |
2698	((vc->vc_attr & 0xe0) >> 4) |
2699	((vc->vc_attr & 0x0e) << 4);
2700
2701	return (vc->vc_attr & 0x88) |
2702	((vc->vc_attr & 0x70) >> 4) |
2703	((vc->vc_attr & 0x07) << 4);
2704	}
2705
2706	static bool vc_is_control(struct vc_data *vc, int tc, int c)
2707	{
2708	/*
2709	* A bitmap for codes <32. A bit of 1 indicates that the code
2710	* corresponding to that bit number invokes some special action (such
2711	* as cursor movement) and should not be displayed as a glyph unless
2712	* the disp_ctrl mode is explicitly enabled.
2713	*/
2714	static const u32 CTRL_ACTION = 0x0d00ff81;
2715	/* Cannot be overridden by disp_ctrl */
2716	static const u32 CTRL_ALWAYS = 0x0800f501;
2717
2718	if (vc->vc_state != ESnormal)
2719	return true;
2720
2721	if (!tc)
2722	return true;
2723
2724	/*
2725	* If the original code was a control character we only allow a glyph
2726	* to be displayed if the code is not normally used (such as for cursor
2727	* movement) or if the disp_ctrl mode has been explicitly enabled.
2728	* Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2729	* displayed as control characters, as the console would be pretty
2730	* useless without them; to display an arbitrary font position use the
2731	* direct-to-font zone in UTF-8 mode.
2732	*/
2733	if (c < 32) {
2734	if (vc->vc_disp_ctrl)
2735	return CTRL_ALWAYS & BIT(c);
2736	else
2737	return vc->vc_utf || (CTRL_ACTION & BIT(c));
2738	}
2739
2740	if (c == 127 && !vc->vc_disp_ctrl)
2741	return true;
2742
2743	if (c == 128 + 27)
2744	return true;
2745
2746	return false;
2747	}
2748
2749	static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2750	struct vc_draw_region *draw)
2751	{
2752	int next_c;
2753	unsigned char vc_attr = vc->vc_attr;
2754	u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2755	u8 width = 1;
2756	bool inverse = false;
2757
2758	if (vc->vc_utf && !vc->vc_disp_ctrl) {
2759	if (is_double_width(ucs: c))
2760	width = 2;
2761	}
2762
2763	/* Now try to find out how to display it */
2764	tc = conv_uni_to_pc(conp: vc, ucs: tc);
2765	if (tc & ~charmask) {
2766	if (tc == -1 || tc == -2)
2767	return -1; /* nothing to display */
2768
2769	/* Glyph not found */
2770	if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2771	!(c & ~charmask)) {
2772	/*
2773	* In legacy mode use the glyph we get by a 1:1
2774	* mapping.
2775	* This would make absolutely no sense with Unicode in
2776	* mind, but do this for ASCII characters since a font
2777	* may lack Unicode mapping info and we don't want to
2778	* end up with having question marks only.
2779	*/
2780	tc = c;
2781	} else {
2782	/*
2783	* Display U+FFFD. If it's not found, display an inverse
2784	* question mark.
2785	*/
2786	tc = conv_uni_to_pc(conp: vc, ucs: 0xfffd);
2787	if (tc < 0) {
2788	inverse = true;
2789	tc = conv_uni_to_pc(conp: vc, ucs: '?');
2790	if (tc < 0)
2791	tc = '?';
2792
2793	vc_attr = vc_invert_attr(vc);
2794	con_flush(vc, draw);
2795	}
2796	}
2797	}
2798
2799	next_c = c;
2800	while (1) {
2801	if (vc->vc_need_wrap || vc->vc_decim)
2802	con_flush(vc, draw);
2803	if (vc->vc_need_wrap) {
2804	cr(vc);
2805	lf(vc);
2806	}
2807	if (vc->vc_decim)
2808	insert_char(vc, nr: 1);
2809	vc_uniscr_putc(vc, uc: next_c);
2810
2811	if (himask)
2812	tc = ((tc & 0x100) ? himask : 0) |
2813	(tc & 0xff);
2814	tc |= (vc_attr << 8) & ~himask;
2815
2816	scr_writew(tc, (u16 *)vc->vc_pos);
2817
2818	if (con_should_update(vc) && draw->x < 0) {
2819	draw->x = vc->state.x;
2820	draw->from = vc->vc_pos;
2821	}
2822	if (vc->state.x == vc->vc_cols - 1) {
2823	vc->vc_need_wrap = vc->vc_decawm;
2824	draw->to = vc->vc_pos + 2;
2825	} else {
2826	vc->state.x++;
2827	draw->to = (vc->vc_pos += 2);
2828	}
2829
2830	if (!--width)
2831	break;
2832
2833	/* A space is printed in the second column */
2834	tc = conv_uni_to_pc(conp: vc, ucs: ' ');
2835	if (tc < 0)
2836	tc = ' ';
2837	next_c = ' ';
2838	}
2839	notify_write(vc, unicode: c);
2840
2841	if (inverse)
2842	con_flush(vc, draw);
2843
2844	return 0;
2845	}
2846
2847	/* acquires console_lock */
2848	static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
2849	{
2850	struct vc_draw_region draw = {
2851	.x = -1,
2852	};
2853	int c, tc, n = 0;
2854	unsigned int currcons;
2855	struct vc_data *vc;
2856	struct vt_notifier_param param;
2857	bool rescan;
2858
2859	if (in_interrupt())
2860	return count;
2861
2862	console_lock();
2863	vc = tty->driver_data;
2864	if (vc == NULL) {
2865	pr_err("vt: argh, driver_data is NULL !\n");
2866	console_unlock();
2867	return 0;
2868	}
2869
2870	currcons = vc->vc_num;
2871	if (!vc_cons_allocated(i: currcons)) {
2872	/* could this happen? */
2873	pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2874	console_unlock();
2875	return 0;
2876	}
2877
2878
2879	/* undraw cursor first */
2880	if (con_is_fg(vc))
2881	hide_cursor(vc);
2882
2883	param.vc = vc;
2884
2885	while (!tty->flow.stopped && count) {
2886	int orig = *buf;
2887	buf++;
2888	n++;
2889	count--;
2890	rescan_last_byte:
2891	c = orig;
2892	rescan = false;
2893
2894	tc = vc_translate(vc, c: &c, rescan: &rescan);
2895	if (tc == -1)
2896	continue;
2897
2898	param.c = tc;
2899	if (atomic_notifier_call_chain(nh: &vt_notifier_list, VT_PREWRITE,
2900	v: &param) == NOTIFY_STOP)
2901	continue;
2902
2903	if (vc_is_control(vc, tc, c)) {
2904	con_flush(vc, draw: &draw);
2905	do_con_trol(tty, vc, c: orig);
2906	continue;
2907	}
2908
2909	if (vc_con_write_normal(vc, tc, c, draw: &draw) < 0)
2910	continue;
2911
2912	if (rescan)
2913	goto rescan_last_byte;
2914	}
2915	con_flush(vc, draw: &draw);
2916	console_conditional_schedule();
2917	notify_update(vc);
2918	console_unlock();
2919	return n;
2920	}
2921
2922	/*
2923	* This is the console switching callback.
2924	*
2925	* Doing console switching in a process context allows
2926	* us to do the switches asynchronously (needed when we want
2927	* to switch due to a keyboard interrupt). Synchronization
2928	* with other console code and prevention of re-entrancy is
2929	* ensured with console_lock.
2930	*/
2931	static void console_callback(struct work_struct *ignored)
2932	{
2933	console_lock();
2934
2935	if (want_console >= 0) {
2936	if (want_console != fg_console &&
2937	vc_cons_allocated(i: want_console)) {
2938	hide_cursor(vc: vc_cons[fg_console].d);
2939	change_console(new_vc: vc_cons[want_console].d);
2940	/* we only changed when the console had already
2941	been allocated - a new console is not created
2942	in an interrupt routine */
2943	}
2944	want_console = -1;
2945	}
2946	if (do_poke_blanked_console) { /* do not unblank for a LED change */
2947	do_poke_blanked_console = 0;
2948	poke_blanked_console();
2949	}
2950	if (scrollback_delta) {
2951	struct vc_data *vc = vc_cons[fg_console].d;
2952	clear_selection();
2953	if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2954	vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2955	scrollback_delta = 0;
2956	}
2957	if (blank_timer_expired) {
2958	do_blank_screen(entering_gfx: 0);
2959	blank_timer_expired = 0;
2960	}
2961	notify_update(vc: vc_cons[fg_console].d);
2962
2963	console_unlock();
2964	}
2965
2966	int set_console(int nr)
2967	{
2968	struct vc_data *vc = vc_cons[fg_console].d;
2969
2970	if (!vc_cons_allocated(i: nr) || vt_dont_switch ||
2971	(vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2972
2973	/*
2974	* Console switch will fail in console_callback() or
2975	* change_console() so there is no point scheduling
2976	* the callback
2977	*
2978	* Existing set_console() users don't check the return
2979	* value so this shouldn't break anything
2980	*/
2981	return -EINVAL;
2982	}
2983
2984	want_console = nr;
2985	schedule_console_callback();
2986
2987	return 0;
2988	}
2989
2990	struct tty_driver *console_driver;
2991
2992	#ifdef CONFIG_VT_CONSOLE
2993
2994	/**
2995	* vt_kmsg_redirect() - Sets/gets the kernel message console
2996	* @new: The new virtual terminal number or -1 if the console should stay
2997	* unchanged
2998	*
2999	* By default, the kernel messages are always printed on the current virtual
3000	* console. However, the user may modify that default with the
3001	* TIOCL_SETKMSGREDIRECT ioctl call.
3002	*
3003	* This function sets the kernel message console to be @new. It returns the old
3004	* virtual console number. The virtual terminal number 0 (both as parameter and
3005	* return value) means no redirection (i.e. always printed on the currently
3006	* active console).
3007	*
3008	* The parameter -1 means that only the current console is returned, but the
3009	* value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3010	* case to make the code more understandable.
3011	*
3012	* When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3013	* the parameter and always returns 0.
3014	*/
3015	int vt_kmsg_redirect(int new)
3016	{
3017	static int kmsg_con;
3018
3019	if (new != -1)
3020	return xchg(&kmsg_con, new);
3021	else
3022	return kmsg_con;
3023	}
3024
3025	/*
3026	* Console on virtual terminal
3027	*
3028	* The console must be locked when we get here.
3029	*/
3030
3031	static void vt_console_print(struct console *co, const char *b, unsigned count)
3032	{
3033	struct vc_data *vc = vc_cons[fg_console].d;
3034	unsigned char c;
3035	static DEFINE_SPINLOCK(printing_lock);
3036	const ushort *start;
3037	ushort start_x, cnt;
3038	int kmsg_console;
3039
3040	WARN_CONSOLE_UNLOCKED();
3041
3042	/* this protects against concurrent oops only */
3043	if (!spin_trylock(lock: &printing_lock))
3044	return;
3045
3046	kmsg_console = vt_get_kmsg_redirect();
3047	if (kmsg_console && vc_cons_allocated(i: kmsg_console - 1))
3048	vc = vc_cons[kmsg_console - 1].d;
3049
3050	if (!vc_cons_allocated(i: fg_console)) {
3051	/* impossible */
3052	/* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3053	goto quit;
3054	}
3055
3056	if (vc->vc_mode != KD_TEXT)
3057	goto quit;
3058
3059	/* undraw cursor first */
3060	if (con_is_fg(vc))
3061	hide_cursor(vc);
3062
3063	start = (ushort *)vc->vc_pos;
3064	start_x = vc->state.x;
3065	cnt = 0;
3066	while (count--) {
3067	c = *b++;
3068	if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3069	if (cnt && con_is_visible(vc))
3070	vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3071	cnt = 0;
3072	if (c == 8) { /* backspace */
3073	bs(vc);
3074	start = (ushort *)vc->vc_pos;
3075	start_x = vc->state.x;
3076	continue;
3077	}
3078	if (c != 13)
3079	lf(vc);
3080	cr(vc);
3081	start = (ushort *)vc->vc_pos;
3082	start_x = vc->state.x;
3083	if (c == 10 || c == 13)
3084	continue;
3085	}
3086	vc_uniscr_putc(vc, uc: c);
3087	scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3088	notify_write(vc, unicode: c);
3089	cnt++;
3090	if (vc->state.x == vc->vc_cols - 1) {
3091	vc->vc_need_wrap = 1;
3092	} else {
3093	vc->vc_pos += 2;
3094	vc->state.x++;
3095	}
3096	}
3097	if (cnt && con_is_visible(vc))
3098	vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3099	set_cursor(vc);
3100	notify_update(vc);
3101
3102	quit:
3103	spin_unlock(lock: &printing_lock);
3104	}
3105
3106	static struct tty_driver *vt_console_device(struct console *c, int *index)
3107	{
3108	*index = c->index ? c->index-1 : fg_console;
3109	return console_driver;
3110	}
3111
3112	static int vt_console_setup(struct console *co, char *options)
3113	{
3114	return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3115	}
3116
3117	static struct console vt_console_driver = {
3118	.name = "tty",
3119	.setup = vt_console_setup,
3120	.write = vt_console_print,
3121	.device = vt_console_device,
3122	.unblank = unblank_screen,
3123	.flags = CON_PRINTBUFFER,
3124	.index = -1,
3125	};
3126	#endif
3127
3128	/*
3129	* Handling of Linux-specific VC ioctls
3130	*/
3131
3132	/*
3133	* Generally a bit racy with respect to console_lock();.
3134	*
3135	* There are some functions which don't need it.
3136	*
3137	* There are some functions which can sleep for arbitrary periods
3138	* (paste_selection) but we don't need the lock there anyway.
3139	*
3140	* set_selection_user has locking, and definitely needs it
3141	*/
3142
3143	int tioclinux(struct tty_struct *tty, unsigned long arg)
3144	{
3145	char type, data;
3146	char __user *p = (char __user *)arg;
3147	int lines;
3148	int ret;
3149
3150	if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3151	return -EPERM;
3152	if (get_user(type, p))
3153	return -EFAULT;
3154	ret = 0;
3155
3156	switch (type) {
3157	case TIOCL_SETSEL:
3158	if (!capable(CAP_SYS_ADMIN))
3159	return -EPERM;
3160	return set_selection_user(sel: (struct tiocl_selection
3161	__user *)(p+1), tty);
3162	case TIOCL_PASTESEL:
3163	if (!capable(CAP_SYS_ADMIN))
3164	return -EPERM;
3165	return paste_selection(tty);
3166	case TIOCL_UNBLANKSCREEN:
3167	console_lock();
3168	unblank_screen();
3169	console_unlock();
3170	break;
3171	case TIOCL_SELLOADLUT:
3172	if (!capable(CAP_SYS_ADMIN))
3173	return -EPERM;
3174	console_lock();
3175	ret = sel_loadlut(p);
3176	console_unlock();
3177	break;
3178	case TIOCL_GETSHIFTSTATE:
3179	/*
3180	* Make it possible to react to Shift+Mousebutton. Note that
3181	* 'shift_state' is an undocumented kernel-internal variable;
3182	* programs not closely related to the kernel should not use
3183	* this.
3184	*/
3185	data = vt_get_shift_state();
3186	return put_user(data, p);
3187	case TIOCL_GETMOUSEREPORTING:
3188	console_lock(); /* May be overkill */
3189	data = mouse_reporting();
3190	console_unlock();
3191	return put_user(data, p);
3192	case TIOCL_SETVESABLANK:
3193	console_lock();
3194	ret = set_vesa_blanking(p);
3195	console_unlock();
3196	break;
3197	case TIOCL_GETKMSGREDIRECT:
3198	data = vt_get_kmsg_redirect();
3199	return put_user(data, p);
3200	case TIOCL_SETKMSGREDIRECT:
3201	if (!capable(CAP_SYS_ADMIN))
3202	return -EPERM;
3203
3204	if (get_user(data, p+1))
3205	return -EFAULT;
3206
3207	vt_kmsg_redirect(new: data);
3208
3209	break;
3210	case TIOCL_GETFGCONSOLE:
3211	/*
3212	* No locking needed as this is a transiently correct return
3213	* anyway if the caller hasn't disabled switching.
3214	*/
3215	return fg_console;
3216	case TIOCL_SCROLLCONSOLE:
3217	if (get_user(lines, (s32 __user *)(p+4)))
3218	return -EFAULT;
3219
3220	/*
3221	* Needs the console lock here. Note that lots of other calls
3222	* need fixing before the lock is actually useful!
3223	*/
3224	console_lock();
3225	scrollfront(vc: vc_cons[fg_console].d, lines);
3226	console_unlock();
3227	break;
3228	case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3229	console_lock();
3230	ignore_poke = 1;
3231	do_blank_screen(entering_gfx: 0);
3232	console_unlock();
3233	break;
3234	case TIOCL_BLANKEDSCREEN:
3235	return console_blanked;
3236	default:
3237	return -EINVAL;
3238	}
3239
3240	return ret;
3241	}
3242
3243	/*
3244	* /dev/ttyN handling
3245	*/
3246
3247	static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
3248	{
3249	int retval;
3250
3251	retval = do_con_write(tty, buf, count);
3252	con_flush_chars(tty);
3253
3254	return retval;
3255	}
3256
3257	static int con_put_char(struct tty_struct *tty, u8 ch)
3258	{
3259	return do_con_write(tty, buf: &ch, count: 1);
3260	}
3261
3262	static unsigned int con_write_room(struct tty_struct *tty)
3263	{
3264	if (tty->flow.stopped)
3265	return 0;
3266	return 32768; /* No limit, really; we're not buffering */
3267	}
3268
3269	/*
3270	* con_throttle and con_unthrottle are only used for
3271	* paste_selection(), which has to stuff in a large number of
3272	* characters...
3273	*/
3274	static void con_throttle(struct tty_struct *tty)
3275	{
3276	}
3277
3278	static void con_unthrottle(struct tty_struct *tty)
3279	{
3280	struct vc_data *vc = tty->driver_data;
3281
3282	wake_up_interruptible(&vc->paste_wait);
3283	}
3284
3285	/*
3286	* Turn the Scroll-Lock LED on when the tty is stopped
3287	*/
3288	static void con_stop(struct tty_struct *tty)
3289	{
3290	int console_num;
3291	if (!tty)
3292	return;
3293	console_num = tty->index;
3294	if (!vc_cons_allocated(i: console_num))
3295	return;
3296	vt_kbd_con_stop(console: console_num);
3297	}
3298
3299	/*
3300	* Turn the Scroll-Lock LED off when the console is started
3301	*/
3302	static void con_start(struct tty_struct *tty)
3303	{
3304	int console_num;
3305	if (!tty)
3306	return;
3307	console_num = tty->index;
3308	if (!vc_cons_allocated(i: console_num))
3309	return;
3310	vt_kbd_con_start(console: console_num);
3311	}
3312
3313	static void con_flush_chars(struct tty_struct *tty)
3314	{
3315	struct vc_data *vc;
3316
3317	if (in_interrupt()) /* from flush_to_ldisc */
3318	return;
3319
3320	/* if we race with con_close(), vt may be null */
3321	console_lock();
3322	vc = tty->driver_data;
3323	if (vc)
3324	set_cursor(vc);
3325	console_unlock();
3326	}
3327
3328	/*
3329	* Allocate the console screen memory.
3330	*/
3331	static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3332	{
3333	unsigned int currcons = tty->index;
3334	struct vc_data *vc;
3335	int ret;
3336
3337	console_lock();
3338	ret = vc_allocate(currcons);
3339	if (ret)
3340	goto unlock;
3341
3342	vc = vc_cons[currcons].d;
3343
3344	/* Still being freed */
3345	if (vc->port.tty) {
3346	ret = -ERESTARTSYS;
3347	goto unlock;
3348	}
3349
3350	ret = tty_port_install(port: &vc->port, driver, tty);
3351	if (ret)
3352	goto unlock;
3353
3354	tty->driver_data = vc;
3355	vc->port.tty = tty;
3356	tty_port_get(port: &vc->port);
3357
3358	if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3359	tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3360	tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3361	}
3362	if (vc->vc_utf)
3363	tty->termios.c_iflag |= IUTF8;
3364	else
3365	tty->termios.c_iflag &= ~IUTF8;
3366	unlock:
3367	console_unlock();
3368	return ret;
3369	}
3370
3371	static int con_open(struct tty_struct *tty, struct file *filp)
3372	{
3373	/* everything done in install */
3374	return 0;
3375	}
3376
3377
3378	static void con_close(struct tty_struct *tty, struct file *filp)
3379	{
3380	/* Nothing to do - we defer to shutdown */
3381	}
3382
3383	static void con_shutdown(struct tty_struct *tty)
3384	{
3385	struct vc_data *vc = tty->driver_data;
3386	BUG_ON(vc == NULL);
3387	console_lock();
3388	vc->port.tty = NULL;
3389	console_unlock();
3390	}
3391
3392	static void con_cleanup(struct tty_struct *tty)
3393	{
3394	struct vc_data *vc = tty->driver_data;
3395
3396	tty_port_put(port: &vc->port);
3397	}
3398
3399	static int default_color = 7; /* white */
3400	static int default_italic_color = 2; // green (ASCII)
3401	static int default_underline_color = 3; // cyan (ASCII)
3402	module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3403	module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3404	module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3405
3406	static void vc_init(struct vc_data *vc, int do_clear)
3407	{
3408	int j, k ;
3409
3410	set_origin(vc);
3411	vc->vc_pos = vc->vc_origin;
3412	reset_vc(vc);
3413	for (j=k=0; j<16; j++) {
3414	vc->vc_palette[k++] = default_red[j] ;
3415	vc->vc_palette[k++] = default_grn[j] ;
3416	vc->vc_palette[k++] = default_blu[j] ;
3417	}
3418	vc->vc_def_color = default_color;
3419	vc->vc_ulcolor = default_underline_color;
3420	vc->vc_itcolor = default_italic_color;
3421	vc->vc_halfcolor = 0x08; /* grey */
3422	init_waitqueue_head(&vc->paste_wait);
3423	reset_terminal(vc, do_clear);
3424	}
3425
3426	/*
3427	* This routine initializes console interrupts, and does nothing
3428	* else. If you want the screen to clear, call tty_write with
3429	* the appropriate escape-sequence.
3430	*/
3431
3432	static int __init con_init(void)
3433	{
3434	const char *display_desc = NULL;
3435	struct vc_data *vc;
3436	unsigned int currcons = 0, i;
3437
3438	console_lock();
3439
3440	if (!conswitchp)
3441	conswitchp = &dummy_con;
3442	display_desc = conswitchp->con_startup();
3443	if (!display_desc) {
3444	fg_console = 0;
3445	console_unlock();
3446	return 0;
3447	}
3448
3449	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3450	struct con_driver *con_driver = &registered_con_driver[i];
3451
3452	if (con_driver->con == NULL) {
3453	con_driver->con = conswitchp;
3454	con_driver->desc = display_desc;
3455	con_driver->flag = CON_DRIVER_FLAG_INIT;
3456	con_driver->first = 0;
3457	con_driver->last = MAX_NR_CONSOLES - 1;
3458	break;
3459	}
3460	}
3461
3462	for (i = 0; i < MAX_NR_CONSOLES; i++)
3463	con_driver_map[i] = conswitchp;
3464
3465	if (blankinterval) {
3466	blank_state = blank_normal_wait;
3467	mod_timer(timer: &console_timer, expires: jiffies + (blankinterval * HZ));
3468	}
3469
3470	for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3471	vc_cons[currcons].d = vc = kzalloc(size: sizeof(struct vc_data), GFP_NOWAIT);
3472	INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3473	tty_port_init(port: &vc->port);
3474	visual_init(vc, num: currcons, init: 1);
3475	/* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3476	vc->vc_screenbuf = kzalloc(size: vc->vc_screenbuf_size, GFP_NOWAIT);
3477	vc_init(vc, do_clear: currcons || !vc->vc_sw->con_save_screen);
3478	}
3479	currcons = fg_console = 0;
3480	master_display_fg = vc = vc_cons[currcons].d;
3481	set_origin(vc);
3482	save_screen(vc);
3483	gotoxy(vc, new_x: vc->state.x, new_y: vc->state.y);
3484	csi_J(vc, vpar: 0);
3485	update_screen(vc);
3486	pr_info("Console: %s %s %dx%d\n",
3487	vc->vc_can_do_color ? "colour" : "mono",
3488	display_desc, vc->vc_cols, vc->vc_rows);
3489
3490	console_unlock();
3491
3492	#ifdef CONFIG_VT_CONSOLE
3493	register_console(&vt_console_driver);
3494	#endif
3495	return 0;
3496	}
3497	console_initcall(con_init);
3498
3499	static const struct tty_operations con_ops = {
3500	.install = con_install,
3501	.open = con_open,
3502	.close = con_close,
3503	.write = con_write,
3504	.write_room = con_write_room,
3505	.put_char = con_put_char,
3506	.flush_chars = con_flush_chars,
3507	.ioctl = vt_ioctl,
3508	#ifdef CONFIG_COMPAT
3509	.compat_ioctl = vt_compat_ioctl,
3510	#endif
3511	.stop = con_stop,
3512	.start = con_start,
3513	.throttle = con_throttle,
3514	.unthrottle = con_unthrottle,
3515	.resize = vt_resize,
3516	.shutdown = con_shutdown,
3517	.cleanup = con_cleanup,
3518	};
3519
3520	static struct cdev vc0_cdev;
3521
3522	static ssize_t show_tty_active(struct device *dev,
3523	struct device_attribute *attr, char *buf)
3524	{
3525	return sprintf(buf, fmt: "tty%d\n", fg_console + 1);
3526	}
3527	static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3528
3529	static struct attribute *vt_dev_attrs[] = {
3530	&dev_attr_active.attr,
3531	NULL
3532	};
3533
3534	ATTRIBUTE_GROUPS(vt_dev);
3535
3536	int __init vty_init(const struct file_operations *console_fops)
3537	{
3538	cdev_init(&vc0_cdev, console_fops);
3539	if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3540	register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3541	panic(fmt: "Couldn't register /dev/tty0 driver\n");
3542	tty0dev = device_create_with_groups(cls: &tty_class, NULL,
3543	MKDEV(TTY_MAJOR, 0), NULL,
3544	groups: vt_dev_groups, fmt: "tty0");
3545	if (IS_ERR(ptr: tty0dev))
3546	tty0dev = NULL;
3547
3548	vcs_init();
3549
3550	console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3551	TTY_DRIVER_RESET_TERMIOS);
3552	if (IS_ERR(ptr: console_driver))
3553	panic(fmt: "Couldn't allocate console driver\n");
3554
3555	console_driver->name = "tty";
3556	console_driver->name_base = 1;
3557	console_driver->major = TTY_MAJOR;
3558	console_driver->minor_start = 1;
3559	console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3560	console_driver->init_termios = tty_std_termios;
3561	if (default_utf8)
3562	console_driver->init_termios.c_iflag |= IUTF8;
3563	tty_set_operations(driver: console_driver, op: &con_ops);
3564	if (tty_register_driver(driver: console_driver))
3565	panic(fmt: "Couldn't register console driver\n");
3566	kbd_init();
3567	console_map_init();
3568	#ifdef CONFIG_MDA_CONSOLE
3569	mda_console_init();
3570	#endif
3571	return 0;
3572	}
3573
3574	static const struct class vtconsole_class = {
3575	.name = "vtconsole",
3576	};
3577
3578	static int do_bind_con_driver(const struct consw *csw, int first, int last,
3579	int deflt)
3580	{
3581	struct module *owner = csw->owner;
3582	const char *desc = NULL;
3583	struct con_driver *con_driver;
3584	int i, j = -1, k = -1, retval = -ENODEV;
3585
3586	if (!try_module_get(module: owner))
3587	return -ENODEV;
3588
3589	WARN_CONSOLE_UNLOCKED();
3590
3591	/* check if driver is registered */
3592	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3593	con_driver = &registered_con_driver[i];
3594
3595	if (con_driver->con == csw) {
3596	desc = con_driver->desc;
3597	retval = 0;
3598	break;
3599	}
3600	}
3601
3602	if (retval)
3603	goto err;
3604
3605	if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3606	csw->con_startup();
3607	con_driver->flag |= CON_DRIVER_FLAG_INIT;
3608	}
3609
3610	if (deflt) {
3611	if (conswitchp)
3612	module_put(module: conswitchp->owner);
3613
3614	__module_get(module: owner);
3615	conswitchp = csw;
3616	}
3617
3618	first = max(first, con_driver->first);
3619	last = min(last, con_driver->last);
3620
3621	for (i = first; i <= last; i++) {
3622	int old_was_color;
3623	struct vc_data *vc = vc_cons[i].d;
3624
3625	if (con_driver_map[i])
3626	module_put(module: con_driver_map[i]->owner);
3627	__module_get(module: owner);
3628	con_driver_map[i] = csw;
3629
3630	if (!vc || !vc->vc_sw)
3631	continue;
3632
3633	j = i;
3634
3635	if (con_is_visible(vc)) {
3636	k = i;
3637	save_screen(vc);
3638	}
3639
3640	old_was_color = vc->vc_can_do_color;
3641	vc->vc_sw->con_deinit(vc);
3642	vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3643	visual_init(vc, num: i, init: 0);
3644	set_origin(vc);
3645	update_attr(vc);
3646
3647	/* If the console changed between mono <-> color, then
3648	* the attributes in the screenbuf will be wrong. The
3649	* following resets all attributes to something sane.
3650	*/
3651	if (old_was_color != vc->vc_can_do_color)
3652	clear_buffer_attributes(vc);
3653	}
3654
3655	pr_info("Console: switching ");
3656	if (!deflt)
3657	pr_cont("consoles %d-%d ", first + 1, last + 1);
3658	if (j >= 0) {
3659	struct vc_data *vc = vc_cons[j].d;
3660
3661	pr_cont("to %s %s %dx%d\n",
3662	vc->vc_can_do_color ? "colour" : "mono",
3663	desc, vc->vc_cols, vc->vc_rows);
3664
3665	if (k >= 0) {
3666	vc = vc_cons[k].d;
3667	update_screen(vc);
3668	}
3669	} else {
3670	pr_cont("to %s\n", desc);
3671	}
3672
3673	retval = 0;
3674	err:
3675	module_put(module: owner);
3676	return retval;
3677	};
3678
3679
3680	#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3681	int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3682	{
3683	struct module *owner = csw->owner;
3684	const struct consw *defcsw = NULL;
3685	struct con_driver *con_driver = NULL, *con_back = NULL;
3686	int i, retval = -ENODEV;
3687
3688	if (!try_module_get(module: owner))
3689	return -ENODEV;
3690
3691	WARN_CONSOLE_UNLOCKED();
3692
3693	/* check if driver is registered and if it is unbindable */
3694	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3695	con_driver = &registered_con_driver[i];
3696
3697	if (con_driver->con == csw &&
3698	con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3699	retval = 0;
3700	break;
3701	}
3702	}
3703
3704	if (retval)
3705	goto err;
3706
3707	retval = -ENODEV;
3708
3709	/* check if backup driver exists */
3710	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3711	con_back = &registered_con_driver[i];
3712
3713	if (con_back->con && con_back->con != csw) {
3714	defcsw = con_back->con;
3715	retval = 0;
3716	break;
3717	}
3718	}
3719
3720	if (retval)
3721	goto err;
3722
3723	if (!con_is_bound(csw))
3724	goto err;
3725
3726	first = max(first, con_driver->first);
3727	last = min(last, con_driver->last);
3728
3729	for (i = first; i <= last; i++) {
3730	if (con_driver_map[i] == csw) {
3731	module_put(module: csw->owner);
3732	con_driver_map[i] = NULL;
3733	}
3734	}
3735
3736	if (!con_is_bound(csw: defcsw)) {
3737	const struct consw *defconsw = conswitchp;
3738
3739	defcsw->con_startup();
3740	con_back->flag |= CON_DRIVER_FLAG_INIT;
3741	/*
3742	* vgacon may change the default driver to point
3743	* to dummycon, we restore it here...
3744	*/
3745	conswitchp = defconsw;
3746	}
3747
3748	if (!con_is_bound(csw))
3749	con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3750
3751	/* ignore return value, binding should not fail */
3752	do_bind_con_driver(csw: defcsw, first, last, deflt);
3753	err:
3754	module_put(module: owner);
3755	return retval;
3756
3757	}
3758	EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3759
3760	static int vt_bind(struct con_driver *con)
3761	{
3762	const struct consw *defcsw = NULL, *csw = NULL;
3763	int i, more = 1, first = -1, last = -1, deflt = 0;
3764
3765	if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3766	goto err;
3767
3768	csw = con->con;
3769
3770	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771	struct con_driver *con = &registered_con_driver[i];
3772
3773	if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3774	defcsw = con->con;
3775	break;
3776	}
3777	}
3778
3779	if (!defcsw)
3780	goto err;
3781
3782	while (more) {
3783	more = 0;
3784
3785	for (i = con->first; i <= con->last; i++) {
3786	if (con_driver_map[i] == defcsw) {
3787	if (first == -1)
3788	first = i;
3789	last = i;
3790	more = 1;
3791	} else if (first != -1)
3792	break;
3793	}
3794
3795	if (first == 0 && last == MAX_NR_CONSOLES -1)
3796	deflt = 1;
3797
3798	if (first != -1)
3799	do_bind_con_driver(csw, first, last, deflt);
3800
3801	first = -1;
3802	last = -1;
3803	deflt = 0;
3804	}
3805
3806	err:
3807	return 0;
3808	}
3809
3810	static int vt_unbind(struct con_driver *con)
3811	{
3812	const struct consw *csw = NULL;
3813	int i, more = 1, first = -1, last = -1, deflt = 0;
3814	int ret;
3815
3816	if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3817	goto err;
3818
3819	csw = con->con;
3820
3821	while (more) {
3822	more = 0;
3823
3824	for (i = con->first; i <= con->last; i++) {
3825	if (con_driver_map[i] == csw) {
3826	if (first == -1)
3827	first = i;
3828	last = i;
3829	more = 1;
3830	} else if (first != -1)
3831	break;
3832	}
3833
3834	if (first == 0 && last == MAX_NR_CONSOLES -1)
3835	deflt = 1;
3836
3837	if (first != -1) {
3838	ret = do_unbind_con_driver(csw, first, last, deflt);
3839	if (ret != 0)
3840	return ret;
3841	}
3842
3843	first = -1;
3844	last = -1;
3845	deflt = 0;
3846	}
3847
3848	err:
3849	return 0;
3850	}
3851	#else
3852	static inline int vt_bind(struct con_driver *con)
3853	{
3854	return 0;
3855	}
3856	static inline int vt_unbind(struct con_driver *con)
3857	{
3858	return 0;
3859	}
3860	#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3861
3862	static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3863	const char *buf, size_t count)
3864	{
3865	struct con_driver *con = dev_get_drvdata(dev);
3866	int bind = simple_strtoul(buf, NULL, 0);
3867
3868	console_lock();
3869
3870	if (bind)
3871	vt_bind(con);
3872	else
3873	vt_unbind(con);
3874
3875	console_unlock();
3876
3877	return count;
3878	}
3879
3880	static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3881	char *buf)
3882	{
3883	struct con_driver *con = dev_get_drvdata(dev);
3884	int bind;
3885
3886	console_lock();
3887	bind = con_is_bound(csw: con->con);
3888	console_unlock();
3889
3890	return sysfs_emit(buf, fmt: "%i\n", bind);
3891	}
3892
3893	static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3894	char *buf)
3895	{
3896	struct con_driver *con = dev_get_drvdata(dev);
3897
3898	return sysfs_emit(buf, fmt: "%s %s\n",
3899	(con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3900	con->desc);
3901
3902	}
3903
3904	static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3905	static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3906
3907	static struct attribute *con_dev_attrs[] = {
3908	&dev_attr_bind.attr,
3909	&dev_attr_name.attr,
3910	NULL
3911	};
3912
3913	ATTRIBUTE_GROUPS(con_dev);
3914
3915	static int vtconsole_init_device(struct con_driver *con)
3916	{
3917	con->flag |= CON_DRIVER_FLAG_ATTR;
3918	return 0;
3919	}
3920
3921	static void vtconsole_deinit_device(struct con_driver *con)
3922	{
3923	con->flag &= ~CON_DRIVER_FLAG_ATTR;
3924	}
3925
3926	/**
3927	* con_is_bound - checks if driver is bound to the console
3928	* @csw: console driver
3929	*
3930	* RETURNS: zero if unbound, nonzero if bound
3931	*
3932	* Drivers can call this and if zero, they should release
3933	* all resources allocated on con_startup()
3934	*/
3935	int con_is_bound(const struct consw *csw)
3936	{
3937	int i, bound = 0;
3938
3939	WARN_CONSOLE_UNLOCKED();
3940
3941	for (i = 0; i < MAX_NR_CONSOLES; i++) {
3942	if (con_driver_map[i] == csw) {
3943	bound = 1;
3944	break;
3945	}
3946	}
3947
3948	return bound;
3949	}
3950	EXPORT_SYMBOL(con_is_bound);
3951
3952	/**
3953	* con_is_visible - checks whether the current console is visible
3954	* @vc: virtual console
3955	*
3956	* RETURNS: zero if not visible, nonzero if visible
3957	*/
3958	bool con_is_visible(const struct vc_data *vc)
3959	{
3960	WARN_CONSOLE_UNLOCKED();
3961
3962	return *vc->vc_display_fg == vc;
3963	}
3964	EXPORT_SYMBOL(con_is_visible);
3965
3966	/**
3967	* con_debug_enter - prepare the console for the kernel debugger
3968	* @vc: virtual console
3969	*
3970	* Called when the console is taken over by the kernel debugger, this
3971	* function needs to save the current console state, then put the console
3972	* into a state suitable for the kernel debugger.
3973	*
3974	* RETURNS:
3975	* Zero on success, nonzero if a failure occurred when trying to prepare
3976	* the console for the debugger.
3977	*/
3978	int con_debug_enter(struct vc_data *vc)
3979	{
3980	int ret = 0;
3981
3982	saved_fg_console = fg_console;
3983	saved_last_console = last_console;
3984	saved_want_console = want_console;
3985	saved_vc_mode = vc->vc_mode;
3986	saved_console_blanked = console_blanked;
3987	vc->vc_mode = KD_TEXT;
3988	console_blanked = 0;
3989	if (vc->vc_sw->con_debug_enter)
3990	ret = vc->vc_sw->con_debug_enter(vc);
3991	#ifdef CONFIG_KGDB_KDB
3992	/* Set the initial LINES variable if it is not already set */
3993	if (vc->vc_rows < 999) {
3994	int linecount;
3995	char lns[4];
3996	const char *setargs[3] = {
3997	"set",
3998	"LINES",
3999	lns,
4000	};
4001	if (kdbgetintenv(setargs[0], &linecount)) {
4002	snprintf(buf: lns, size: 4, fmt: "%i", vc->vc_rows);
4003	kdb_set(2, setargs);
4004	}
4005	}
4006	if (vc->vc_cols < 999) {
4007	int colcount;
4008	char cols[4];
4009	const char *setargs[3] = {
4010	"set",
4011	"COLUMNS",
4012	cols,
4013	};
4014	if (kdbgetintenv(setargs[0], &colcount)) {
4015	snprintf(buf: cols, size: 4, fmt: "%i", vc->vc_cols);
4016	kdb_set(2, setargs);
4017	}
4018	}
4019	#endif /* CONFIG_KGDB_KDB */
4020	return ret;
4021	}
4022	EXPORT_SYMBOL_GPL(con_debug_enter);
4023
4024	/**
4025	* con_debug_leave - restore console state
4026	*
4027	* Restore the console state to what it was before the kernel debugger
4028	* was invoked.
4029	*
4030	* RETURNS:
4031	* Zero on success, nonzero if a failure occurred when trying to restore
4032	* the console.
4033	*/
4034	int con_debug_leave(void)
4035	{
4036	struct vc_data *vc;
4037	int ret = 0;
4038
4039	fg_console = saved_fg_console;
4040	last_console = saved_last_console;
4041	want_console = saved_want_console;
4042	console_blanked = saved_console_blanked;
4043	vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4044
4045	vc = vc_cons[fg_console].d;
4046	if (vc->vc_sw->con_debug_leave)
4047	ret = vc->vc_sw->con_debug_leave(vc);
4048	return ret;
4049	}
4050	EXPORT_SYMBOL_GPL(con_debug_leave);
4051
4052	static int do_register_con_driver(const struct consw *csw, int first, int last)
4053	{
4054	struct module *owner = csw->owner;
4055	struct con_driver *con_driver;
4056	const char *desc;
4057	int i, retval;
4058
4059	WARN_CONSOLE_UNLOCKED();
4060
4061	if (!try_module_get(module: owner))
4062	return -ENODEV;
4063
4064	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4065	con_driver = &registered_con_driver[i];
4066
4067	/* already registered */
4068	if (con_driver->con == csw) {
4069	retval = -EBUSY;
4070	goto err;
4071	}
4072	}
4073
4074	desc = csw->con_startup();
4075	if (!desc) {
4076	retval = -ENODEV;
4077	goto err;
4078	}
4079
4080	retval = -EINVAL;
4081
4082	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4083	con_driver = &registered_con_driver[i];
4084
4085	if (con_driver->con == NULL &&
4086	!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4087	con_driver->con = csw;
4088	con_driver->desc = desc;
4089	con_driver->node = i;
4090	con_driver->flag = CON_DRIVER_FLAG_MODULE |
4091	CON_DRIVER_FLAG_INIT;
4092	con_driver->first = first;
4093	con_driver->last = last;
4094	retval = 0;
4095	break;
4096	}
4097	}
4098
4099	if (retval)
4100	goto err;
4101
4102	con_driver->dev =
4103	device_create_with_groups(cls: &vtconsole_class, NULL,
4104	MKDEV(0, con_driver->node),
4105	drvdata: con_driver, groups: con_dev_groups,
4106	fmt: "vtcon%i", con_driver->node);
4107	if (IS_ERR(ptr: con_driver->dev)) {
4108	pr_warn("Unable to create device for %s; errno = %ld\n",
4109	con_driver->desc, PTR_ERR(con_driver->dev));
4110	con_driver->dev = NULL;
4111	} else {
4112	vtconsole_init_device(con: con_driver);
4113	}
4114
4115	err:
4116	module_put(module: owner);
4117	return retval;
4118	}
4119
4120
4121	/**
4122	* do_unregister_con_driver - unregister console driver from console layer
4123	* @csw: console driver
4124	*
4125	* DESCRIPTION: All drivers that registers to the console layer must
4126	* call this function upon exit, or if the console driver is in a state
4127	* where it won't be able to handle console services, such as the
4128	* framebuffer console without loaded framebuffer drivers.
4129	*
4130	* The driver must unbind first prior to unregistration.
4131	*/
4132	int do_unregister_con_driver(const struct consw *csw)
4133	{
4134	int i;
4135
4136	/* cannot unregister a bound driver */
4137	if (con_is_bound(csw))
4138	return -EBUSY;
4139
4140	if (csw == conswitchp)
4141	return -EINVAL;
4142
4143	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4144	struct con_driver *con_driver = &registered_con_driver[i];
4145
4146	if (con_driver->con == csw) {
4147	/*
4148	* Defer the removal of the sysfs entries since that
4149	* will acquire the kernfs s_active lock and we can't
4150	* acquire this lock while holding the console lock:
4151	* the unbind sysfs entry imposes already the opposite
4152	* order. Reset con already here to prevent any later
4153	* lookup to succeed and mark this slot as zombie, so
4154	* it won't get reused until we complete the removal
4155	* in the deferred work.
4156	*/
4157	con_driver->con = NULL;
4158	con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4159	schedule_work(work: &con_driver_unregister_work);
4160
4161	return 0;
4162	}
4163	}
4164
4165	return -ENODEV;
4166	}
4167	EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4168
4169	static void con_driver_unregister_callback(struct work_struct *ignored)
4170	{
4171	int i;
4172
4173	console_lock();
4174
4175	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4176	struct con_driver *con_driver = &registered_con_driver[i];
4177
4178	if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4179	continue;
4180
4181	console_unlock();
4182
4183	vtconsole_deinit_device(con: con_driver);
4184	device_destroy(cls: &vtconsole_class, MKDEV(0, con_driver->node));
4185
4186	console_lock();
4187
4188	if (WARN_ON_ONCE(con_driver->con))
4189	con_driver->con = NULL;
4190	con_driver->desc = NULL;
4191	con_driver->dev = NULL;
4192	con_driver->node = 0;
4193	WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4194	con_driver->flag = 0;
4195	con_driver->first = 0;
4196	con_driver->last = 0;
4197	}
4198
4199	console_unlock();
4200	}
4201
4202	/*
4203	* If we support more console drivers, this function is used
4204	* when a driver wants to take over some existing consoles
4205	* and become default driver for newly opened ones.
4206	*
4207	* do_take_over_console is basically a register followed by bind
4208	*/
4209	int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4210	{
4211	int err;
4212
4213	err = do_register_con_driver(csw, first, last);
4214	/*
4215	* If we get an busy error we still want to bind the console driver
4216	* and return success, as we may have unbound the console driver
4217	* but not unregistered it.
4218	*/
4219	if (err == -EBUSY)
4220	err = 0;
4221	if (!err)
4222	do_bind_con_driver(csw, first, last, deflt);
4223
4224	return err;
4225	}
4226	EXPORT_SYMBOL_GPL(do_take_over_console);
4227
4228
4229	/*
4230	* give_up_console is a wrapper to unregister_con_driver. It will only
4231	* work if driver is fully unbound.
4232	*/
4233	void give_up_console(const struct consw *csw)
4234	{
4235	console_lock();
4236	do_unregister_con_driver(csw);
4237	console_unlock();
4238	}
4239	EXPORT_SYMBOL(give_up_console);
4240
4241	static int __init vtconsole_class_init(void)
4242	{
4243	int i;
4244
4245	i = class_register(class: &vtconsole_class);
4246	if (i)
4247	pr_warn("Unable to create vt console class; errno = %d\n", i);
4248
4249	/* Add system drivers to sysfs */
4250	for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4251	struct con_driver *con = &registered_con_driver[i];
4252
4253	if (con->con && !con->dev) {
4254	con->dev =
4255	device_create_with_groups(cls: &vtconsole_class, NULL,
4256	MKDEV(0, con->node),
4257	drvdata: con, groups: con_dev_groups,
4258	fmt: "vtcon%i", con->node);
4259
4260	if (IS_ERR(ptr: con->dev)) {
4261	pr_warn("Unable to create device for %s; errno = %ld\n",
4262	con->desc, PTR_ERR(con->dev));
4263	con->dev = NULL;
4264	} else {
4265	vtconsole_init_device(con);
4266	}
4267	}
4268	}
4269
4270	return 0;
4271	}
4272	postcore_initcall(vtconsole_class_init);
4273
4274	/*
4275	* Screen blanking
4276	*/
4277
4278	static int set_vesa_blanking(char __user *p)
4279	{
4280	unsigned int mode;
4281
4282	if (get_user(mode, p + 1))
4283	return -EFAULT;
4284
4285	vesa_blank_mode = (mode < 4) ? mode : 0;
4286	return 0;
4287	}
4288
4289	void do_blank_screen(int entering_gfx)
4290	{
4291	struct vc_data *vc = vc_cons[fg_console].d;
4292	int i;
4293
4294	might_sleep();
4295
4296	WARN_CONSOLE_UNLOCKED();
4297
4298	if (console_blanked) {
4299	if (blank_state == blank_vesa_wait) {
4300	blank_state = blank_off;
4301	vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4302	}
4303	return;
4304	}
4305
4306	/* entering graphics mode? */
4307	if (entering_gfx) {
4308	hide_cursor(vc);
4309	save_screen(vc);
4310	vc->vc_sw->con_blank(vc, -1, 1);
4311	console_blanked = fg_console + 1;
4312	blank_state = blank_off;
4313	set_origin(vc);
4314	return;
4315	}
4316
4317	blank_state = blank_off;
4318
4319	/* don't blank graphics */
4320	if (vc->vc_mode != KD_TEXT) {
4321	console_blanked = fg_console + 1;
4322	return;
4323	}
4324
4325	hide_cursor(vc);
4326	del_timer_sync(timer: &console_timer);
4327	blank_timer_expired = 0;
4328
4329	save_screen(vc);
4330	/* In case we need to reset origin, blanking hook returns 1 */
4331	i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4332	console_blanked = fg_console + 1;
4333	if (i)
4334	set_origin(vc);
4335
4336	if (console_blank_hook && console_blank_hook(1))
4337	return;
4338
4339	if (vesa_off_interval && vesa_blank_mode) {
4340	blank_state = blank_vesa_wait;
4341	mod_timer(timer: &console_timer, expires: jiffies + vesa_off_interval);
4342	}
4343	vt_event_post(VT_EVENT_BLANK, old: vc->vc_num, new: vc->vc_num);
4344	}
4345	EXPORT_SYMBOL(do_blank_screen);
4346
4347	/*
4348	* Called by timer as well as from vt_console_driver
4349	*/
4350	void do_unblank_screen(int leaving_gfx)
4351	{
4352	struct vc_data *vc;
4353
4354	/* This should now always be called from a "sane" (read: can schedule)
4355	* context for the sake of the low level drivers, except in the special
4356	* case of oops_in_progress
4357	*/
4358	if (!oops_in_progress)
4359	might_sleep();
4360
4361	WARN_CONSOLE_UNLOCKED();
4362
4363	ignore_poke = 0;
4364	if (!console_blanked)
4365	return;
4366	if (!vc_cons_allocated(i: fg_console)) {
4367	/* impossible */
4368	pr_warn("unblank_screen: tty %d not allocated ??\n",
4369	fg_console + 1);
4370	return;
4371	}
4372	vc = vc_cons[fg_console].d;
4373	if (vc->vc_mode != KD_TEXT)
4374	return; /* but leave console_blanked != 0 */
4375
4376	if (blankinterval) {
4377	mod_timer(timer: &console_timer, expires: jiffies + (blankinterval * HZ));
4378	blank_state = blank_normal_wait;
4379	}
4380
4381	console_blanked = 0;
4382	if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4383	/* Low-level driver cannot restore -> do it ourselves */
4384	update_screen(vc);
4385	if (console_blank_hook)
4386	console_blank_hook(0);
4387	set_palette(vc);
4388	set_cursor(vc);
4389	vt_event_post(VT_EVENT_UNBLANK, old: vc->vc_num, new: vc->vc_num);
4390	}
4391	EXPORT_SYMBOL(do_unblank_screen);
4392
4393	/*
4394	* This is called by the outside world to cause a forced unblank, mostly for
4395	* oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4396	* call it with 1 as an argument and so force a mode restore... that may kill
4397	* X or at least garbage the screen but would also make the Oops visible...
4398	*/
4399	static void unblank_screen(void)
4400	{
4401	do_unblank_screen(0);
4402	}
4403
4404	/*
4405	* We defer the timer blanking to work queue so it can take the console mutex
4406	* (console operations can still happen at irq time, but only from printk which
4407	* has the console mutex. Not perfect yet, but better than no locking
4408	*/
4409	static void blank_screen_t(struct timer_list *unused)
4410	{
4411	blank_timer_expired = 1;
4412	schedule_work(work: &console_work);
4413	}
4414
4415	void poke_blanked_console(void)
4416	{
4417	WARN_CONSOLE_UNLOCKED();
4418
4419	/* Add this so we quickly catch whoever might call us in a non
4420	* safe context. Nowadays, unblank_screen() isn't to be called in
4421	* atomic contexts and is allowed to schedule (with the special case
4422	* of oops_in_progress, but that isn't of any concern for this
4423	* function. --BenH.
4424	*/
4425	might_sleep();
4426
4427	/* This isn't perfectly race free, but a race here would be mostly harmless,
4428	* at worst, we'll do a spurious blank and it's unlikely
4429	*/
4430	del_timer(timer: &console_timer);
4431	blank_timer_expired = 0;
4432
4433	if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4434	return;
4435	if (console_blanked)
4436	unblank_screen();
4437	else if (blankinterval) {
4438	mod_timer(timer: &console_timer, expires: jiffies + (blankinterval * HZ));
4439	blank_state = blank_normal_wait;
4440	}
4441	}
4442
4443	/*
4444	* Palettes
4445	*/
4446
4447	static void set_palette(struct vc_data *vc)
4448	{
4449	WARN_CONSOLE_UNLOCKED();
4450
4451	if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4452	vc->vc_sw->con_set_palette(vc, color_table);
4453	}
4454
4455	/*
4456	* Load palette into the DAC registers. arg points to a colour
4457	* map, 3 bytes per colour, 16 colours, range from 0 to 255.
4458	*/
4459
4460	int con_set_cmap(unsigned char __user *arg)
4461	{
4462	int i, j, k;
4463	unsigned char colormap[3*16];
4464
4465	if (copy_from_user(to: colormap, from: arg, n: sizeof(colormap)))
4466	return -EFAULT;
4467
4468	console_lock();
4469	for (i = k = 0; i < 16; i++) {
4470	default_red[i] = colormap[k++];
4471	default_grn[i] = colormap[k++];
4472	default_blu[i] = colormap[k++];
4473	}
4474	for (i = 0; i < MAX_NR_CONSOLES; i++) {
4475	if (!vc_cons_allocated(i))
4476	continue;
4477	for (j = k = 0; j < 16; j++) {
4478	vc_cons[i].d->vc_palette[k++] = default_red[j];
4479	vc_cons[i].d->vc_palette[k++] = default_grn[j];
4480	vc_cons[i].d->vc_palette[k++] = default_blu[j];
4481	}
4482	set_palette(vc_cons[i].d);
4483	}
4484	console_unlock();
4485
4486	return 0;
4487	}
4488
4489	int con_get_cmap(unsigned char __user *arg)
4490	{
4491	int i, k;
4492	unsigned char colormap[3*16];
4493
4494	console_lock();
4495	for (i = k = 0; i < 16; i++) {
4496	colormap[k++] = default_red[i];
4497	colormap[k++] = default_grn[i];
4498	colormap[k++] = default_blu[i];
4499	}
4500	console_unlock();
4501
4502	if (copy_to_user(to: arg, from: colormap, n: sizeof(colormap)))
4503	return -EFAULT;
4504
4505	return 0;
4506	}
4507
4508	void reset_palette(struct vc_data *vc)
4509	{
4510	int j, k;
4511	for (j=k=0; j<16; j++) {
4512	vc->vc_palette[k++] = default_red[j];
4513	vc->vc_palette[k++] = default_grn[j];
4514	vc->vc_palette[k++] = default_blu[j];
4515	}
4516	set_palette(vc);
4517	}
4518
4519	/*
4520	* Font switching
4521	*
4522	* Currently we only support fonts up to 128 pixels wide, at a maximum height
4523	* of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4524	* (shorts/ints, depending on width) reserved for each character which is
4525	* kinda wasty, but this is done in order to maintain compatibility with the
4526	* EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4527	* into its favorite format (maybe we should add a `fontoffset' field to the
4528	* `display' structure so we won't have to convert the fontdata all the time.
4529	* /Jes
4530	*/
4531
4532	#define max_font_width 64
4533	#define max_font_height 128
4534	#define max_font_glyphs 512
4535	#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
4536
4537	static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4538	{
4539	struct console_font font;
4540	int rc = -EINVAL;
4541	int c;
4542	unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
4543
4544	if (vpitch > max_font_height)
4545	return -EINVAL;
4546
4547	if (op->data) {
4548	font.data = kvmalloc(max_font_size, GFP_KERNEL);
4549	if (!font.data)
4550	return -ENOMEM;
4551	} else
4552	font.data = NULL;
4553
4554	console_lock();
4555	if (vc->vc_mode != KD_TEXT)
4556	rc = -EINVAL;
4557	else if (vc->vc_sw->con_font_get)
4558	rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
4559	else
4560	rc = -ENOSYS;
4561	console_unlock();
4562
4563	if (rc)
4564	goto out;
4565
4566	c = (font.width+7)/8 * vpitch * font.charcount;
4567
4568	if (op->data && font.charcount > op->charcount)
4569	rc = -ENOSPC;
4570	if (font.width > op->width || font.height > op->height)
4571	rc = -ENOSPC;
4572	if (rc)
4573	goto out;
4574
4575	op->height = font.height;
4576	op->width = font.width;
4577	op->charcount = font.charcount;
4578
4579	if (op->data && copy_to_user(to: op->data, from: font.data, n: c))
4580	rc = -EFAULT;
4581
4582	out:
4583	kvfree(addr: font.data);
4584	return rc;
4585	}
4586
4587	static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4588	{
4589	struct console_font font;
4590	int rc = -EINVAL;
4591	int size;
4592	unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
4593
4594	if (vc->vc_mode != KD_TEXT)
4595	return -EINVAL;
4596	if (!op->data)
4597	return -EINVAL;
4598	if (op->charcount > max_font_glyphs)
4599	return -EINVAL;
4600	if (op->width <= 0 || op->width > max_font_width || !op->height ||
4601	op->height > max_font_height)
4602	return -EINVAL;
4603	if (vpitch < op->height)
4604	return -EINVAL;
4605	size = (op->width+7)/8 * vpitch * op->charcount;
4606	if (size > max_font_size)
4607	return -ENOSPC;
4608
4609	font.data = memdup_user(op->data, size);
4610	if (IS_ERR(ptr: font.data))
4611	return PTR_ERR(ptr: font.data);
4612
4613	font.charcount = op->charcount;
4614	font.width = op->width;
4615	font.height = op->height;
4616
4617	console_lock();
4618	if (vc->vc_mode != KD_TEXT)
4619	rc = -EINVAL;
4620	else if (vc->vc_sw->con_font_set) {
4621	if (vc_is_sel(vc))
4622	clear_selection();
4623	rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
4624	} else
4625	rc = -ENOSYS;
4626	console_unlock();
4627	kfree(objp: font.data);
4628	return rc;
4629	}
4630
4631	static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4632	{
4633	struct console_font font = {.width = op->width, .height = op->height};
4634	char name[MAX_FONT_NAME];
4635	char *s = name;
4636	int rc;
4637
4638
4639	if (!op->data)
4640	s = NULL;
4641	else if (strncpy_from_user(dst: name, src: op->data, MAX_FONT_NAME - 1) < 0)
4642	return -EFAULT;
4643	else
4644	name[MAX_FONT_NAME - 1] = 0;
4645
4646	console_lock();
4647	if (vc->vc_mode != KD_TEXT) {
4648	console_unlock();
4649	return -EINVAL;
4650	}
4651	if (vc->vc_sw->con_font_default) {
4652	if (vc_is_sel(vc))
4653	clear_selection();
4654	rc = vc->vc_sw->con_font_default(vc, &font, s);
4655	} else
4656	rc = -ENOSYS;
4657	console_unlock();
4658	if (!rc) {
4659	op->width = font.width;
4660	op->height = font.height;
4661	}
4662	return rc;
4663	}
4664
4665	int con_font_op(struct vc_data *vc, struct console_font_op *op)
4666	{
4667	switch (op->op) {
4668	case KD_FONT_OP_SET:
4669	case KD_FONT_OP_SET_TALL:
4670	return con_font_set(vc, op);
4671	case KD_FONT_OP_GET:
4672	case KD_FONT_OP_GET_TALL:
4673	return con_font_get(vc, op);
4674	case KD_FONT_OP_SET_DEFAULT:
4675	return con_font_default(vc, op);
4676	case KD_FONT_OP_COPY:
4677	/* was buggy and never really used */
4678	return -EINVAL;
4679	}
4680	return -ENOSYS;
4681	}
4682
4683	/*
4684	* Interface exported to selection and vcs.
4685	*/
4686
4687	/* used by selection */
4688	u16 screen_glyph(const struct vc_data *vc, int offset)
4689	{
4690	u16 w = scr_readw(screenpos(vc, offset, true));
4691	u16 c = w & 0xff;
4692
4693	if (w & vc->vc_hi_font_mask)
4694	c |= 0x100;
4695	return c;
4696	}
4697	EXPORT_SYMBOL_GPL(screen_glyph);
4698
4699	u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4700	{
4701	u32 **uni_lines = vc->vc_uni_lines;
4702
4703	if (uni_lines)
4704	return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
4705
4706	return inverse_translate(conp: vc, glyph: screen_glyph(vc, n * 2), use_unicode: true);
4707	}
4708	EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4709
4710	/* used by vcs - note the word offset */
4711	unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4712	{
4713	return screenpos(vc, offset: 2 * w_offset, viewed);
4714	}
4715	EXPORT_SYMBOL_GPL(screen_pos);
4716
4717	void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4718	{
4719	/* clamp values if they don't fit */
4720	xy[0] = min(vc->state.x, 0xFFu);
4721	xy[1] = min(vc->state.y, 0xFFu);
4722	}
4723
4724	void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4725	{
4726	hide_cursor(vc);
4727	gotoxy(vc, new_x: xy[0], new_y: xy[1]);
4728	set_cursor(vc);
4729	}
4730
4731	u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4732	{
4733	if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4734	return softcursor_original;
4735	return scr_readw(org);
4736	}
4737
4738	void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4739	{
4740	scr_writew(val, org);
4741	if ((unsigned long)org == vc->vc_pos) {
4742	softcursor_original = -1;
4743	add_softcursor(vc);
4744	}
4745	}
4746
4747	void vcs_scr_updated(struct vc_data *vc)
4748	{
4749	notify_update(vc);
4750	}
4751
4752	void vc_scrolldelta_helper(struct vc_data *c, int lines,
4753	unsigned int rolled_over, void *base, unsigned int size)
4754	{
4755	unsigned long ubase = (unsigned long)base;
4756	ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4757	ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4758	ptrdiff_t origin = (void *)c->vc_origin - base;
4759	int margin = c->vc_size_row * 4;
4760	int from, wrap, from_off, avail;
4761
4762	/* Turn scrollback off */
4763	if (!lines) {
4764	c->vc_visible_origin = c->vc_origin;
4765	return;
4766	}
4767
4768	/* Do we have already enough to allow jumping from 0 to the end? */
4769	if (rolled_over > scr_end + margin) {
4770	from = scr_end;
4771	wrap = rolled_over + c->vc_size_row;
4772	} else {
4773	from = 0;
4774	wrap = size;
4775	}
4776
4777	from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4778	avail = (origin - from + wrap) % wrap;
4779
4780	/* Only a little piece would be left? Show all incl. the piece! */
4781	if (avail < 2 * margin)
4782	margin = 0;
4783	if (from_off < margin)
4784	from_off = 0;
4785	if (from_off > avail - margin)
4786	from_off = avail;
4787
4788	c->vc_visible_origin = ubase + (from + from_off) % wrap;
4789	}
4790	EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4791