xref: /linux/drivers/video/fbdev/core/fbcon.c (revision 705c09bb3cdffb141986598ad4ff9c9b0a66c3bd)
1 /*
2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
3  *
4  *	Copyright (C) 1995 Geert Uytterhoeven
5  *
6  *
7  *  This file is based on the original Amiga console driver (amicon.c):
8  *
9  *	Copyright (C) 1993 Hamish Macdonald
10  *			   Greg Harp
11  *	Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
12  *
13  *	      with work by William Rucklidge (wjr@cs.cornell.edu)
14  *			   Geert Uytterhoeven
15  *			   Jes Sorensen (jds@kom.auc.dk)
16  *			   Martin Apel
17  *
18  *  and on the original Atari console driver (atacon.c):
19  *
20  *	Copyright (C) 1993 Bjoern Brauel
21  *			   Roman Hodek
22  *
23  *	      with work by Guenther Kelleter
24  *			   Martin Schaller
25  *			   Andreas Schwab
26  *
27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
29  *  and software scrollback added by
30  *                         Jakub Jelinek (jj@ultra.linux.cz)
31  *
32  *  Random hacking by Martin Mares <mj@ucw.cz>
33  *
34  *	2001 - Documented with DocBook
35  *	- Brad Douglas <brad@neruo.com>
36  *
37  *  The low level operations for the various display memory organizations are
38  *  now in separate source files.
39  *
40  *  Currently the following organizations are supported:
41  *
42  *    o afb			Amiga bitplanes
43  *    o cfb{2,4,8,16,24,32}	Packed pixels
44  *    o ilbm			Amiga interleaved bitplanes
45  *    o iplan2p[248]		Atari interleaved bitplanes
46  *    o mfb			Monochrome
47  *    o vga			VGA characters/attributes
48  *
49  *  To do:
50  *
51  *    - Implement 16 plane mode (iplan2p16)
52  *
53  *
54  *  This file is subject to the terms and conditions of the GNU General Public
55  *  License.  See the file COPYING in the main directory of this archive for
56  *  more details.
57  */
58 
59 #include <linux/module.h>
60 #include <linux/types.h>
61 #include <linux/fs.h>
62 #include <linux/kernel.h>
63 #include <linux/delay.h>	/* MSch: for IRQ probe */
64 #include <linux/console.h>
65 #include <linux/string.h>
66 #include <linux/kd.h>
67 #include <linux/slab.h>
68 #include <linux/fb.h>
69 #include <linux/fbcon.h>
70 #include <linux/vt_kern.h>
71 #include <linux/selection.h>
72 #include <linux/font.h>
73 #include <linux/smp.h>
74 #include <linux/init.h>
75 #include <linux/interrupt.h>
76 #include <linux/crc32.h> /* For counting font checksums */
77 #include <linux/uaccess.h>
78 #include <asm/irq.h>
79 
80 #include "fbcon.h"
81 #include "fb_internal.h"
82 
83 /*
84  * FIXME: Locking
85  *
86  * - fbcon state itself is protected by the console_lock, and the code does a
87  *   pretty good job at making sure that lock is held everywhere it's needed.
88  *
89  * - fbcon doesn't bother with fb_lock/unlock at all. This is buggy, since it
90  *   means concurrent access to the same fbdev from both fbcon and userspace
91  *   will blow up. To fix this all fbcon calls from fbmem.c need to be moved out
92  *   of fb_lock/unlock protected sections, since otherwise we'll recurse and
93  *   deadlock eventually. Aside: Due to these deadlock issues the fbdev code in
94  *   fbmem.c cannot use locking asserts, and there's lots of callers which get
95  *   the rules wrong, e.g. fbsysfs.c entirely missed fb_lock/unlock calls too.
96  */
97 
98 enum {
99 	FBCON_LOGO_CANSHOW	= -1,	/* the logo can be shown */
100 	FBCON_LOGO_DRAW		= -2,	/* draw the logo to a console */
101 	FBCON_LOGO_DONTSHOW	= -3	/* do not show the logo */
102 };
103 
104 static struct fbcon_display fb_display[MAX_NR_CONSOLES];
105 
106 static struct fb_info *fbcon_registered_fb[FB_MAX];
107 static int fbcon_num_registered_fb;
108 
109 #define fbcon_for_each_registered_fb(i)		\
110 	for (i = 0; WARN_CONSOLE_UNLOCKED(), i < FB_MAX; i++)		\
111 		if (!fbcon_registered_fb[i]) {} else
112 
113 static signed char con2fb_map[MAX_NR_CONSOLES];
114 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
115 
116 static struct fb_info *fbcon_info_from_console(int console)
117 {
118 	WARN_CONSOLE_UNLOCKED();
119 
120 	return fbcon_registered_fb[con2fb_map[console]];
121 }
122 
123 static int logo_lines;
124 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
125    enums.  */
126 static int logo_shown = FBCON_LOGO_CANSHOW;
127 /* console mappings */
128 static unsigned int first_fb_vc;
129 static unsigned int last_fb_vc = MAX_NR_CONSOLES - 1;
130 static int fbcon_is_default = 1;
131 static int primary_device = -1;
132 static int fbcon_has_console_bind;
133 
134 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
135 static int map_override;
136 
137 static inline void fbcon_map_override(void)
138 {
139 	map_override = 1;
140 }
141 #else
142 static inline void fbcon_map_override(void)
143 {
144 }
145 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
146 
147 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
148 static bool deferred_takeover = true;
149 #else
150 #define deferred_takeover false
151 #endif
152 
153 /* font data */
154 static char fontname[40];
155 
156 /* current fb_info */
157 static int info_idx = -1;
158 
159 /* console rotation */
160 static int initial_rotation = -1;
161 static int fbcon_has_sysfs;
162 static int margin_color;
163 
164 static const struct consw fb_con;
165 
166 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
167 
168 static int fbcon_cursor_noblink;
169 
170 #define divides(a, b)	((!(a) || (b)%(a)) ? 0 : 1)
171 
172 /*
173  *  Interface used by the world
174  */
175 
176 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
177 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table);
178 
179 /*
180  *  Internal routines
181  */
182 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
183 			   int unit);
184 static void fbcon_redraw_move(struct vc_data *vc, struct fbcon_display *p,
185 			      int line, int count, int dy);
186 static void fbcon_modechanged(struct fb_info *info);
187 static void fbcon_set_all_vcs(struct fb_info *info);
188 
189 static struct device *fbcon_device;
190 
191 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
192 static inline void fbcon_set_rotation(struct fb_info *info)
193 {
194 	struct fbcon_ops *ops = info->fbcon_par;
195 
196 	if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
197 	    ops->p->con_rotate < 4)
198 		ops->rotate = ops->p->con_rotate;
199 	else
200 		ops->rotate = 0;
201 }
202 
203 static void fbcon_rotate(struct fb_info *info, u32 rotate)
204 {
205 	struct fbcon_ops *ops= info->fbcon_par;
206 	struct fb_info *fb_info;
207 
208 	if (!ops || ops->currcon == -1)
209 		return;
210 
211 	fb_info = fbcon_info_from_console(ops->currcon);
212 
213 	if (info == fb_info) {
214 		struct fbcon_display *p = &fb_display[ops->currcon];
215 
216 		if (rotate < 4)
217 			p->con_rotate = rotate;
218 		else
219 			p->con_rotate = 0;
220 
221 		fbcon_modechanged(info);
222 	}
223 }
224 
225 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
226 {
227 	struct fbcon_ops *ops = info->fbcon_par;
228 	struct vc_data *vc;
229 	struct fbcon_display *p;
230 	int i;
231 
232 	if (!ops || ops->currcon < 0 || rotate > 3)
233 		return;
234 
235 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
236 		vc = vc_cons[i].d;
237 		if (!vc || vc->vc_mode != KD_TEXT ||
238 		    fbcon_info_from_console(i) != info)
239 			continue;
240 
241 		p = &fb_display[vc->vc_num];
242 		p->con_rotate = rotate;
243 	}
244 
245 	fbcon_set_all_vcs(info);
246 }
247 #else
248 static inline void fbcon_set_rotation(struct fb_info *info)
249 {
250 	struct fbcon_ops *ops = info->fbcon_par;
251 
252 	ops->rotate = FB_ROTATE_UR;
253 }
254 
255 static void fbcon_rotate(struct fb_info *info, u32 rotate)
256 {
257 	return;
258 }
259 
260 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
261 {
262 	return;
263 }
264 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
265 
266 static int fbcon_get_rotate(struct fb_info *info)
267 {
268 	struct fbcon_ops *ops = info->fbcon_par;
269 
270 	return (ops) ? ops->rotate : 0;
271 }
272 
273 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
274 {
275 	struct fbcon_ops *ops = info->fbcon_par;
276 
277 	return (info->state != FBINFO_STATE_RUNNING ||
278 		vc->vc_mode != KD_TEXT || ops->graphics);
279 }
280 
281 static int get_color(struct vc_data *vc, struct fb_info *info,
282 	      u16 c, int is_fg)
283 {
284 	int depth = fb_get_color_depth(&info->var, &info->fix);
285 	int color = 0;
286 
287 	if (console_blanked) {
288 		unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
289 
290 		c = vc->vc_video_erase_char & charmask;
291 	}
292 
293 	if (depth != 1)
294 		color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
295 			: attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
296 
297 	switch (depth) {
298 	case 1:
299 	{
300 		int col = mono_col(info);
301 		/* 0 or 1 */
302 		int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
303 		int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
304 
305 		if (console_blanked)
306 			fg = bg;
307 
308 		color = (is_fg) ? fg : bg;
309 		break;
310 	}
311 	case 2:
312 		/*
313 		 * Scale down 16-colors to 4 colors. Default 4-color palette
314 		 * is grayscale. However, simply dividing the values by 4
315 		 * will not work, as colors 1, 2 and 3 will be scaled-down
316 		 * to zero rendering them invisible.  So empirically convert
317 		 * colors to a sane 4-level grayscale.
318 		 */
319 		switch (color) {
320 		case 0:
321 			color = 0; /* black */
322 			break;
323 		case 1 ... 6:
324 			color = 2; /* white */
325 			break;
326 		case 7 ... 8:
327 			color = 1; /* gray */
328 			break;
329 		default:
330 			color = 3; /* intense white */
331 			break;
332 		}
333 		break;
334 	case 3:
335 		/*
336 		 * Last 8 entries of default 16-color palette is a more intense
337 		 * version of the first 8 (i.e., same chrominance, different
338 		 * luminance).
339 		 */
340 		color &= 7;
341 		break;
342 	}
343 
344 
345 	return color;
346 }
347 
348 static void fb_flashcursor(struct work_struct *work)
349 {
350 	struct fbcon_ops *ops = container_of(work, struct fbcon_ops, cursor_work.work);
351 	struct fb_info *info;
352 	struct vc_data *vc = NULL;
353 	int c;
354 	int mode;
355 	int ret;
356 
357 	/* FIXME: we should sort out the unbind locking instead */
358 	/* instead we just fail to flash the cursor if we can't get
359 	 * the lock instead of blocking fbcon deinit */
360 	ret = console_trylock();
361 	if (ret == 0)
362 		return;
363 
364 	/* protected by console_lock */
365 	info = ops->info;
366 
367 	if (ops->currcon != -1)
368 		vc = vc_cons[ops->currcon].d;
369 
370 	if (!vc || !con_is_visible(vc) ||
371 	    fbcon_info_from_console(vc->vc_num) != info ||
372 	    vc->vc_deccm != 1) {
373 		console_unlock();
374 		return;
375 	}
376 
377 	c = scr_readw((u16 *) vc->vc_pos);
378 	mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
379 		CM_ERASE : CM_DRAW;
380 	ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
381 		    get_color(vc, info, c, 0));
382 	console_unlock();
383 
384 	queue_delayed_work(system_power_efficient_wq, &ops->cursor_work,
385 			   ops->cur_blink_jiffies);
386 }
387 
388 static void fbcon_add_cursor_work(struct fb_info *info)
389 {
390 	struct fbcon_ops *ops = info->fbcon_par;
391 
392 	if (!fbcon_cursor_noblink)
393 		queue_delayed_work(system_power_efficient_wq, &ops->cursor_work,
394 				   ops->cur_blink_jiffies);
395 }
396 
397 static void fbcon_del_cursor_work(struct fb_info *info)
398 {
399 	struct fbcon_ops *ops = info->fbcon_par;
400 
401 	cancel_delayed_work_sync(&ops->cursor_work);
402 }
403 
404 #ifndef MODULE
405 static int __init fb_console_setup(char *this_opt)
406 {
407 	char *options;
408 	int i, j;
409 
410 	if (!this_opt || !*this_opt)
411 		return 1;
412 
413 	while ((options = strsep(&this_opt, ",")) != NULL) {
414 		if (!strncmp(options, "font:", 5)) {
415 			strscpy(fontname, options + 5, sizeof(fontname));
416 			continue;
417 		}
418 
419 		if (!strncmp(options, "scrollback:", 11)) {
420 			pr_warn("Ignoring scrollback size option\n");
421 			continue;
422 		}
423 
424 		if (!strncmp(options, "map:", 4)) {
425 			options += 4;
426 			if (*options) {
427 				for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
428 					if (!options[j])
429 						j = 0;
430 					con2fb_map_boot[i] =
431 						(options[j++]-'0') % FB_MAX;
432 				}
433 
434 				fbcon_map_override();
435 			}
436 			continue;
437 		}
438 
439 		if (!strncmp(options, "vc:", 3)) {
440 			options += 3;
441 			if (*options)
442 				first_fb_vc = simple_strtoul(options, &options, 10) - 1;
443 			if (first_fb_vc >= MAX_NR_CONSOLES)
444 				first_fb_vc = 0;
445 			if (*options++ == '-')
446 				last_fb_vc = simple_strtoul(options, &options, 10) - 1;
447 			if (last_fb_vc < first_fb_vc || last_fb_vc >= MAX_NR_CONSOLES)
448 				last_fb_vc = MAX_NR_CONSOLES - 1;
449 			fbcon_is_default = 0;
450 			continue;
451 		}
452 
453 		if (!strncmp(options, "rotate:", 7)) {
454 			options += 7;
455 			if (*options)
456 				initial_rotation = simple_strtoul(options, &options, 0);
457 			if (initial_rotation > 3)
458 				initial_rotation = 0;
459 			continue;
460 		}
461 
462 		if (!strncmp(options, "margin:", 7)) {
463 			options += 7;
464 			if (*options)
465 				margin_color = simple_strtoul(options, &options, 0);
466 			continue;
467 		}
468 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
469 		if (!strcmp(options, "nodefer")) {
470 			deferred_takeover = false;
471 			continue;
472 		}
473 #endif
474 
475 #ifdef CONFIG_LOGO
476 		if (!strncmp(options, "logo-pos:", 9)) {
477 			options += 9;
478 			if (!strcmp(options, "center"))
479 				fb_center_logo = true;
480 			continue;
481 		}
482 
483 		if (!strncmp(options, "logo-count:", 11)) {
484 			options += 11;
485 			if (*options)
486 				fb_logo_count = simple_strtol(options, &options, 0);
487 			continue;
488 		}
489 #endif
490 	}
491 	return 1;
492 }
493 
494 __setup("fbcon=", fb_console_setup);
495 #endif
496 
497 static int search_fb_in_map(int idx)
498 {
499 	int i, retval = 0;
500 
501 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
502 		if (con2fb_map[i] == idx)
503 			retval = 1;
504 	}
505 	return retval;
506 }
507 
508 static int search_for_mapped_con(void)
509 {
510 	int i, retval = 0;
511 
512 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
513 		if (con2fb_map[i] != -1)
514 			retval = 1;
515 	}
516 	return retval;
517 }
518 
519 static int do_fbcon_takeover(int show_logo)
520 {
521 	int err, i;
522 
523 	if (!fbcon_num_registered_fb)
524 		return -ENODEV;
525 
526 	if (!show_logo)
527 		logo_shown = FBCON_LOGO_DONTSHOW;
528 
529 	for (i = first_fb_vc; i <= last_fb_vc; i++)
530 		con2fb_map[i] = info_idx;
531 
532 	err = do_take_over_console(&fb_con, first_fb_vc, last_fb_vc,
533 				fbcon_is_default);
534 
535 	if (err) {
536 		for (i = first_fb_vc; i <= last_fb_vc; i++)
537 			con2fb_map[i] = -1;
538 		info_idx = -1;
539 	} else {
540 		fbcon_has_console_bind = 1;
541 	}
542 
543 	return err;
544 }
545 
546 #ifdef MODULE
547 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
548 			       int cols, int rows, int new_cols, int new_rows)
549 {
550 	logo_shown = FBCON_LOGO_DONTSHOW;
551 }
552 #else
553 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
554 			       int cols, int rows, int new_cols, int new_rows)
555 {
556 	/* Need to make room for the logo */
557 	struct fbcon_ops *ops = info->fbcon_par;
558 	int cnt, erase = vc->vc_video_erase_char, step;
559 	unsigned short *save = NULL, *r, *q;
560 	int logo_height;
561 
562 	if (info->fbops->owner) {
563 		logo_shown = FBCON_LOGO_DONTSHOW;
564 		return;
565 	}
566 
567 	/*
568 	 * remove underline attribute from erase character
569 	 * if black and white framebuffer.
570 	 */
571 	if (fb_get_color_depth(&info->var, &info->fix) == 1)
572 		erase &= ~0x400;
573 	logo_height = fb_prepare_logo(info, ops->rotate);
574 	logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);
575 	q = (unsigned short *) (vc->vc_origin +
576 				vc->vc_size_row * rows);
577 	step = logo_lines * cols;
578 	for (r = q - logo_lines * cols; r < q; r++)
579 		if (scr_readw(r) != vc->vc_video_erase_char)
580 			break;
581 	if (r != q && new_rows >= rows + logo_lines) {
582 		save = kmalloc(array3_size(logo_lines, new_cols, 2),
583 			       GFP_KERNEL);
584 		if (save) {
585 			int i = min(cols, new_cols);
586 			scr_memsetw(save, erase, array3_size(logo_lines, new_cols, 2));
587 			r = q - step;
588 			for (cnt = 0; cnt < logo_lines; cnt++, r += i)
589 				scr_memcpyw(save + cnt * new_cols, r, 2 * i);
590 			r = q;
591 		}
592 	}
593 	if (r == q) {
594 		/* We can scroll screen down */
595 		r = q - step - cols;
596 		for (cnt = rows - logo_lines; cnt > 0; cnt--) {
597 			scr_memcpyw(r + step, r, vc->vc_size_row);
598 			r -= cols;
599 		}
600 		if (!save) {
601 			int lines;
602 			if (vc->state.y + logo_lines >= rows)
603 				lines = rows - vc->state.y - 1;
604 			else
605 				lines = logo_lines;
606 			vc->state.y += lines;
607 			vc->vc_pos += lines * vc->vc_size_row;
608 		}
609 	}
610 	scr_memsetw((unsigned short *) vc->vc_origin,
611 		    erase,
612 		    vc->vc_size_row * logo_lines);
613 
614 	if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
615 		fbcon_clear_margins(vc, 0);
616 		update_screen(vc);
617 	}
618 
619 	if (save) {
620 		q = (unsigned short *) (vc->vc_origin +
621 					vc->vc_size_row *
622 					rows);
623 		scr_memcpyw(q, save, array3_size(logo_lines, new_cols, 2));
624 		vc->state.y += logo_lines;
625 		vc->vc_pos += logo_lines * vc->vc_size_row;
626 		kfree(save);
627 	}
628 
629 	if (logo_shown == FBCON_LOGO_DONTSHOW)
630 		return;
631 
632 	if (logo_lines > vc->vc_bottom) {
633 		logo_shown = FBCON_LOGO_CANSHOW;
634 		pr_info("fbcon: disable boot-logo (boot-logo bigger than screen).\n");
635 	} else {
636 		logo_shown = FBCON_LOGO_DRAW;
637 		vc->vc_top = logo_lines;
638 	}
639 }
640 #endif /* MODULE */
641 
642 #ifdef CONFIG_FB_TILEBLITTING
643 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
644 {
645 	struct fbcon_ops *ops = info->fbcon_par;
646 
647 	ops->p = &fb_display[vc->vc_num];
648 
649 	if ((info->flags & FBINFO_MISC_TILEBLITTING))
650 		fbcon_set_tileops(vc, info);
651 	else {
652 		fbcon_set_rotation(info);
653 		fbcon_set_bitops(ops);
654 	}
655 }
656 
657 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
658 {
659 	int err = 0;
660 
661 	if (info->flags & FBINFO_MISC_TILEBLITTING &&
662 	    info->tileops->fb_get_tilemax(info) < charcount)
663 		err = 1;
664 
665 	return err;
666 }
667 #else
668 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
669 {
670 	struct fbcon_ops *ops = info->fbcon_par;
671 
672 	info->flags &= ~FBINFO_MISC_TILEBLITTING;
673 	ops->p = &fb_display[vc->vc_num];
674 	fbcon_set_rotation(info);
675 	fbcon_set_bitops(ops);
676 }
677 
678 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
679 {
680 	return 0;
681 }
682 
683 #endif /* CONFIG_MISC_TILEBLITTING */
684 
685 static void fbcon_release(struct fb_info *info)
686 {
687 	lock_fb_info(info);
688 	if (info->fbops->fb_release)
689 		info->fbops->fb_release(info, 0);
690 	unlock_fb_info(info);
691 
692 	module_put(info->fbops->owner);
693 
694 	if (info->fbcon_par) {
695 		struct fbcon_ops *ops = info->fbcon_par;
696 
697 		fbcon_del_cursor_work(info);
698 		kfree(ops->cursor_state.mask);
699 		kfree(ops->cursor_data);
700 		kfree(ops->cursor_src);
701 		kfree(ops->fontbuffer);
702 		kfree(info->fbcon_par);
703 		info->fbcon_par = NULL;
704 	}
705 }
706 
707 static int fbcon_open(struct fb_info *info)
708 {
709 	struct fbcon_ops *ops;
710 
711 	if (!try_module_get(info->fbops->owner))
712 		return -ENODEV;
713 
714 	lock_fb_info(info);
715 	if (info->fbops->fb_open &&
716 	    info->fbops->fb_open(info, 0)) {
717 		unlock_fb_info(info);
718 		module_put(info->fbops->owner);
719 		return -ENODEV;
720 	}
721 	unlock_fb_info(info);
722 
723 	ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
724 	if (!ops) {
725 		fbcon_release(info);
726 		return -ENOMEM;
727 	}
728 
729 	INIT_DELAYED_WORK(&ops->cursor_work, fb_flashcursor);
730 	ops->info = info;
731 	info->fbcon_par = ops;
732 	ops->cur_blink_jiffies = HZ / 5;
733 
734 	return 0;
735 }
736 
737 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
738 				  int unit)
739 {
740 	int err;
741 
742 	err = fbcon_open(info);
743 	if (err)
744 		return err;
745 
746 	if (vc)
747 		set_blitting_type(vc, info);
748 
749 	return err;
750 }
751 
752 static void con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
753 				   struct fb_info *newinfo)
754 {
755 	int ret;
756 
757 	fbcon_release(oldinfo);
758 
759 	/*
760 	  If oldinfo and newinfo are driving the same hardware,
761 	  the fb_release() method of oldinfo may attempt to
762 	  restore the hardware state.  This will leave the
763 	  newinfo in an undefined state. Thus, a call to
764 	  fb_set_par() may be needed for the newinfo.
765 	*/
766 	if (newinfo && newinfo->fbops->fb_set_par) {
767 		ret = newinfo->fbops->fb_set_par(newinfo);
768 
769 		if (ret)
770 			printk(KERN_ERR "con2fb_release_oldinfo: "
771 				"detected unhandled fb_set_par error, "
772 				"error code %d\n", ret);
773 	}
774 }
775 
776 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
777 				int unit, int show_logo)
778 {
779 	struct fbcon_ops *ops = info->fbcon_par;
780 	int ret;
781 
782 	ops->currcon = fg_console;
783 
784 	if (info->fbops->fb_set_par && !ops->initialized) {
785 		ret = info->fbops->fb_set_par(info);
786 
787 		if (ret)
788 			printk(KERN_ERR "con2fb_init_display: detected "
789 				"unhandled fb_set_par error, "
790 				"error code %d\n", ret);
791 	}
792 
793 	ops->initialized = true;
794 	ops->graphics = 0;
795 	fbcon_set_disp(info, &info->var, unit);
796 
797 	if (show_logo) {
798 		struct vc_data *fg_vc = vc_cons[fg_console].d;
799 		struct fb_info *fg_info =
800 			fbcon_info_from_console(fg_console);
801 
802 		fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
803 				   fg_vc->vc_rows, fg_vc->vc_cols,
804 				   fg_vc->vc_rows);
805 	}
806 
807 	update_screen(vc_cons[fg_console].d);
808 }
809 
810 /**
811  *	set_con2fb_map - map console to frame buffer device
812  *	@unit: virtual console number to map
813  *	@newidx: frame buffer index to map virtual console to
814  *      @user: user request
815  *
816  *	Maps a virtual console @unit to a frame buffer device
817  *	@newidx.
818  *
819  *	This should be called with the console lock held.
820  */
821 static int set_con2fb_map(int unit, int newidx, int user)
822 {
823 	struct vc_data *vc = vc_cons[unit].d;
824 	int oldidx = con2fb_map[unit];
825 	struct fb_info *info = fbcon_registered_fb[newidx];
826 	struct fb_info *oldinfo = NULL;
827 	int err = 0, show_logo;
828 
829 	WARN_CONSOLE_UNLOCKED();
830 
831 	if (oldidx == newidx)
832 		return 0;
833 
834 	if (!info)
835 		return -EINVAL;
836 
837 	if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
838 		info_idx = newidx;
839 		return do_fbcon_takeover(0);
840 	}
841 
842 	if (oldidx != -1)
843 		oldinfo = fbcon_registered_fb[oldidx];
844 
845 	if (!search_fb_in_map(newidx)) {
846 		err = con2fb_acquire_newinfo(vc, info, unit);
847 		if (err)
848 			return err;
849 
850 		fbcon_add_cursor_work(info);
851 	}
852 
853 	con2fb_map[unit] = newidx;
854 
855 	/*
856 	 * If old fb is not mapped to any of the consoles,
857 	 * fbcon should release it.
858 	 */
859 	if (oldinfo && !search_fb_in_map(oldidx))
860 		con2fb_release_oldinfo(vc, oldinfo, info);
861 
862 	show_logo = (fg_console == 0 && !user &&
863 			 logo_shown != FBCON_LOGO_DONTSHOW);
864 
865 	con2fb_map_boot[unit] = newidx;
866 	con2fb_init_display(vc, info, unit, show_logo);
867 
868 	if (!search_fb_in_map(info_idx))
869 		info_idx = newidx;
870 
871 	return err;
872 }
873 
874 /*
875  *  Low Level Operations
876  */
877 /* NOTE: fbcon cannot be __init: it may be called from do_take_over_console later */
878 static int var_to_display(struct fbcon_display *disp,
879 			  struct fb_var_screeninfo *var,
880 			  struct fb_info *info)
881 {
882 	disp->xres_virtual = var->xres_virtual;
883 	disp->yres_virtual = var->yres_virtual;
884 	disp->bits_per_pixel = var->bits_per_pixel;
885 	disp->grayscale = var->grayscale;
886 	disp->nonstd = var->nonstd;
887 	disp->accel_flags = var->accel_flags;
888 	disp->height = var->height;
889 	disp->width = var->width;
890 	disp->red = var->red;
891 	disp->green = var->green;
892 	disp->blue = var->blue;
893 	disp->transp = var->transp;
894 	disp->rotate = var->rotate;
895 	disp->mode = fb_match_mode(var, &info->modelist);
896 	if (disp->mode == NULL)
897 		/* This should not happen */
898 		return -EINVAL;
899 	return 0;
900 }
901 
902 static void display_to_var(struct fb_var_screeninfo *var,
903 			   struct fbcon_display *disp)
904 {
905 	fb_videomode_to_var(var, disp->mode);
906 	var->xres_virtual = disp->xres_virtual;
907 	var->yres_virtual = disp->yres_virtual;
908 	var->bits_per_pixel = disp->bits_per_pixel;
909 	var->grayscale = disp->grayscale;
910 	var->nonstd = disp->nonstd;
911 	var->accel_flags = disp->accel_flags;
912 	var->height = disp->height;
913 	var->width = disp->width;
914 	var->red = disp->red;
915 	var->green = disp->green;
916 	var->blue = disp->blue;
917 	var->transp = disp->transp;
918 	var->rotate = disp->rotate;
919 }
920 
921 static const char *fbcon_startup(void)
922 {
923 	const char *display_desc = "frame buffer device";
924 	struct fbcon_display *p = &fb_display[fg_console];
925 	struct vc_data *vc = vc_cons[fg_console].d;
926 	const struct font_desc *font = NULL;
927 	struct fb_info *info = NULL;
928 	struct fbcon_ops *ops;
929 	int rows, cols;
930 
931 	/*
932 	 *  If num_registered_fb is zero, this is a call for the dummy part.
933 	 *  The frame buffer devices weren't initialized yet.
934 	 */
935 	if (!fbcon_num_registered_fb || info_idx == -1)
936 		return display_desc;
937 	/*
938 	 * Instead of blindly using registered_fb[0], we use info_idx, set by
939 	 * fbcon_fb_registered();
940 	 */
941 	info = fbcon_registered_fb[info_idx];
942 	if (!info)
943 		return NULL;
944 
945 	if (fbcon_open(info))
946 		return NULL;
947 
948 	ops = info->fbcon_par;
949 	ops->currcon = -1;
950 	ops->graphics = 1;
951 	ops->cur_rotate = -1;
952 
953 	p->con_rotate = initial_rotation;
954 	if (p->con_rotate == -1)
955 		p->con_rotate = info->fbcon_rotate_hint;
956 	if (p->con_rotate == -1)
957 		p->con_rotate = FB_ROTATE_UR;
958 
959 	set_blitting_type(vc, info);
960 
961 	/* Setup default font */
962 	if (!p->fontdata) {
963 		if (!fontname[0] || !(font = find_font(fontname)))
964 			font = get_default_font(info->var.xres,
965 						info->var.yres,
966 						info->pixmap.blit_x,
967 						info->pixmap.blit_y);
968 		vc->vc_font.width = font->width;
969 		vc->vc_font.height = font->height;
970 		vc->vc_font.data = (void *)(p->fontdata = font->data);
971 		vc->vc_font.charcount = font->charcount;
972 	}
973 
974 	cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
975 	rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
976 	cols /= vc->vc_font.width;
977 	rows /= vc->vc_font.height;
978 	vc_resize(vc, cols, rows);
979 
980 	pr_debug("mode:   %s\n", info->fix.id);
981 	pr_debug("visual: %d\n", info->fix.visual);
982 	pr_debug("res:    %dx%d-%d\n", info->var.xres,
983 		 info->var.yres,
984 		 info->var.bits_per_pixel);
985 
986 	fbcon_add_cursor_work(info);
987 	return display_desc;
988 }
989 
990 static void fbcon_init(struct vc_data *vc, int init)
991 {
992 	struct fb_info *info;
993 	struct fbcon_ops *ops;
994 	struct vc_data **default_mode = vc->vc_display_fg;
995 	struct vc_data *svc = *default_mode;
996 	struct fbcon_display *t, *p = &fb_display[vc->vc_num];
997 	int logo = 1, new_rows, new_cols, rows, cols;
998 	int ret;
999 
1000 	if (WARN_ON(info_idx == -1))
1001 	    return;
1002 
1003 	if (con2fb_map[vc->vc_num] == -1)
1004 		con2fb_map[vc->vc_num] = info_idx;
1005 
1006 	info = fbcon_info_from_console(vc->vc_num);
1007 
1008 	if (logo_shown < 0 && console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
1009 		logo_shown = FBCON_LOGO_DONTSHOW;
1010 
1011 	if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1012 	    (info->fix.type == FB_TYPE_TEXT))
1013 		logo = 0;
1014 
1015 	if (var_to_display(p, &info->var, info))
1016 		return;
1017 
1018 	if (!info->fbcon_par)
1019 		con2fb_acquire_newinfo(vc, info, vc->vc_num);
1020 
1021 	/* If we are not the first console on this
1022 	   fb, copy the font from that console */
1023 	t = &fb_display[fg_console];
1024 	if (!p->fontdata) {
1025 		if (t->fontdata) {
1026 			struct vc_data *fvc = vc_cons[fg_console].d;
1027 
1028 			vc->vc_font.data = (void *)(p->fontdata =
1029 						    fvc->vc_font.data);
1030 			vc->vc_font.width = fvc->vc_font.width;
1031 			vc->vc_font.height = fvc->vc_font.height;
1032 			vc->vc_font.charcount = fvc->vc_font.charcount;
1033 			p->userfont = t->userfont;
1034 
1035 			if (p->userfont)
1036 				REFCOUNT(p->fontdata)++;
1037 		} else {
1038 			const struct font_desc *font = NULL;
1039 
1040 			if (!fontname[0] || !(font = find_font(fontname)))
1041 				font = get_default_font(info->var.xres,
1042 							info->var.yres,
1043 							info->pixmap.blit_x,
1044 							info->pixmap.blit_y);
1045 			vc->vc_font.width = font->width;
1046 			vc->vc_font.height = font->height;
1047 			vc->vc_font.data = (void *)(p->fontdata = font->data);
1048 			vc->vc_font.charcount = font->charcount;
1049 		}
1050 	}
1051 
1052 	vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1053 	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1054 	if (vc->vc_font.charcount == 256) {
1055 		vc->vc_hi_font_mask = 0;
1056 	} else {
1057 		vc->vc_hi_font_mask = 0x100;
1058 		if (vc->vc_can_do_color)
1059 			vc->vc_complement_mask <<= 1;
1060 	}
1061 
1062 	if (!*svc->uni_pagedict_loc)
1063 		con_set_default_unimap(svc);
1064 	if (!*vc->uni_pagedict_loc)
1065 		con_copy_unimap(vc, svc);
1066 
1067 	ops = info->fbcon_par;
1068 	ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1069 
1070 	p->con_rotate = initial_rotation;
1071 	if (p->con_rotate == -1)
1072 		p->con_rotate = info->fbcon_rotate_hint;
1073 	if (p->con_rotate == -1)
1074 		p->con_rotate = FB_ROTATE_UR;
1075 
1076 	set_blitting_type(vc, info);
1077 
1078 	cols = vc->vc_cols;
1079 	rows = vc->vc_rows;
1080 	new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1081 	new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1082 	new_cols /= vc->vc_font.width;
1083 	new_rows /= vc->vc_font.height;
1084 
1085 	/*
1086 	 * We must always set the mode. The mode of the previous console
1087 	 * driver could be in the same resolution but we are using different
1088 	 * hardware so we have to initialize the hardware.
1089 	 *
1090 	 * We need to do it in fbcon_init() to prevent screen corruption.
1091 	 */
1092 	if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
1093 		if (info->fbops->fb_set_par && !ops->initialized) {
1094 			ret = info->fbops->fb_set_par(info);
1095 
1096 			if (ret)
1097 				printk(KERN_ERR "fbcon_init: detected "
1098 					"unhandled fb_set_par error, "
1099 					"error code %d\n", ret);
1100 		}
1101 
1102 		ops->initialized = true;
1103 	}
1104 
1105 	ops->graphics = 0;
1106 
1107 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
1108 	if ((info->flags & FBINFO_HWACCEL_COPYAREA) &&
1109 	    !(info->flags & FBINFO_HWACCEL_DISABLED))
1110 		p->scrollmode = SCROLL_MOVE;
1111 	else /* default to something safe */
1112 		p->scrollmode = SCROLL_REDRAW;
1113 #endif
1114 
1115 	/*
1116 	 *  ++guenther: console.c:vc_allocate() relies on initializing
1117 	 *  vc_{cols,rows}, but we must not set those if we are only
1118 	 *  resizing the console.
1119 	 */
1120 	if (init) {
1121 		vc->vc_cols = new_cols;
1122 		vc->vc_rows = new_rows;
1123 	} else
1124 		vc_resize(vc, new_cols, new_rows);
1125 
1126 	if (logo)
1127 		fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1128 
1129 	if (ops->rotate_font && ops->rotate_font(info, vc)) {
1130 		ops->rotate = FB_ROTATE_UR;
1131 		set_blitting_type(vc, info);
1132 	}
1133 
1134 	ops->p = &fb_display[fg_console];
1135 }
1136 
1137 static void fbcon_free_font(struct fbcon_display *p)
1138 {
1139 	if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
1140 		kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
1141 	p->fontdata = NULL;
1142 	p->userfont = 0;
1143 }
1144 
1145 static void set_vc_hi_font(struct vc_data *vc, bool set);
1146 
1147 static void fbcon_release_all(void)
1148 {
1149 	struct fb_info *info;
1150 	int i, j, mapped;
1151 
1152 	fbcon_for_each_registered_fb(i) {
1153 		mapped = 0;
1154 		info = fbcon_registered_fb[i];
1155 
1156 		for (j = first_fb_vc; j <= last_fb_vc; j++) {
1157 			if (con2fb_map[j] == i) {
1158 				mapped = 1;
1159 				con2fb_map[j] = -1;
1160 			}
1161 		}
1162 
1163 		if (mapped)
1164 			fbcon_release(info);
1165 	}
1166 }
1167 
1168 static void fbcon_deinit(struct vc_data *vc)
1169 {
1170 	struct fbcon_display *p = &fb_display[vc->vc_num];
1171 	struct fb_info *info;
1172 	struct fbcon_ops *ops;
1173 	int idx;
1174 
1175 	fbcon_free_font(p);
1176 	idx = con2fb_map[vc->vc_num];
1177 
1178 	if (idx == -1)
1179 		goto finished;
1180 
1181 	info = fbcon_registered_fb[idx];
1182 
1183 	if (!info)
1184 		goto finished;
1185 
1186 	ops = info->fbcon_par;
1187 
1188 	if (!ops)
1189 		goto finished;
1190 
1191 	if (con_is_visible(vc))
1192 		fbcon_del_cursor_work(info);
1193 
1194 	ops->initialized = false;
1195 finished:
1196 
1197 	fbcon_free_font(p);
1198 	vc->vc_font.data = NULL;
1199 
1200 	if (vc->vc_hi_font_mask && vc->vc_screenbuf)
1201 		set_vc_hi_font(vc, false);
1202 
1203 	if (!con_is_bound(&fb_con))
1204 		fbcon_release_all();
1205 
1206 	if (vc->vc_num == logo_shown)
1207 		logo_shown = FBCON_LOGO_CANSHOW;
1208 
1209 	return;
1210 }
1211 
1212 /* ====================================================================== */
1213 
1214 /*  fbcon_XXX routines - interface used by the world
1215  *
1216  *  This system is now divided into two levels because of complications
1217  *  caused by hardware scrolling. Top level functions:
1218  *
1219  *	fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1220  *
1221  *  handles y values in range [0, scr_height-1] that correspond to real
1222  *  screen positions. y_wrap shift means that first line of bitmap may be
1223  *  anywhere on this display. These functions convert lineoffsets to
1224  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1225  *
1226  *	fbcon_bmove_physical_8()    -- These functions fast implementations
1227  *	fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1228  *	fbcon_putc_physical_8()	    -- (font width != 8) may be added later
1229  *
1230  *  WARNING:
1231  *
1232  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1233  *  Implies should only really hardware scroll in rows. Only reason for
1234  *  restriction is simplicity & efficiency at the moment.
1235  */
1236 
1237 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1238 			int width)
1239 {
1240 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1241 	struct fbcon_ops *ops = info->fbcon_par;
1242 
1243 	struct fbcon_display *p = &fb_display[vc->vc_num];
1244 	u_int y_break;
1245 
1246 	if (fbcon_is_inactive(vc, info))
1247 		return;
1248 
1249 	if (!height || !width)
1250 		return;
1251 
1252 	if (sy < vc->vc_top && vc->vc_top == logo_lines) {
1253 		vc->vc_top = 0;
1254 		/*
1255 		 * If the font dimensions are not an integral of the display
1256 		 * dimensions then the ops->clear below won't end up clearing
1257 		 * the margins.  Call clear_margins here in case the logo
1258 		 * bitmap stretched into the margin area.
1259 		 */
1260 		fbcon_clear_margins(vc, 0);
1261 	}
1262 
1263 	/* Split blits that cross physical y_wrap boundary */
1264 
1265 	y_break = p->vrows - p->yscroll;
1266 	if (sy < y_break && sy + height - 1 >= y_break) {
1267 		u_int b = y_break - sy;
1268 		ops->clear(vc, info, real_y(p, sy), sx, b, width);
1269 		ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1270 				 width);
1271 	} else
1272 		ops->clear(vc, info, real_y(p, sy), sx, height, width);
1273 }
1274 
1275 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1276 			int count, int ypos, int xpos)
1277 {
1278 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1279 	struct fbcon_display *p = &fb_display[vc->vc_num];
1280 	struct fbcon_ops *ops = info->fbcon_par;
1281 
1282 	if (!fbcon_is_inactive(vc, info))
1283 		ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1284 			   get_color(vc, info, scr_readw(s), 1),
1285 			   get_color(vc, info, scr_readw(s), 0));
1286 }
1287 
1288 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1289 {
1290 	unsigned short chr;
1291 
1292 	scr_writew(c, &chr);
1293 	fbcon_putcs(vc, &chr, 1, ypos, xpos);
1294 }
1295 
1296 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1297 {
1298 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1299 	struct fbcon_ops *ops = info->fbcon_par;
1300 
1301 	if (!fbcon_is_inactive(vc, info))
1302 		ops->clear_margins(vc, info, margin_color, bottom_only);
1303 }
1304 
1305 static void fbcon_cursor(struct vc_data *vc, int mode)
1306 {
1307 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1308 	struct fbcon_ops *ops = info->fbcon_par;
1309  	int c = scr_readw((u16 *) vc->vc_pos);
1310 
1311 	ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1312 
1313 	if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1314 		return;
1315 
1316 	if (vc->vc_cursor_type & CUR_SW)
1317 		fbcon_del_cursor_work(info);
1318 	else
1319 		fbcon_add_cursor_work(info);
1320 
1321 	ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1322 
1323 	if (!ops->cursor)
1324 		return;
1325 
1326 	ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
1327 		    get_color(vc, info, c, 0));
1328 }
1329 
1330 static int scrollback_phys_max = 0;
1331 static int scrollback_max = 0;
1332 static int scrollback_current = 0;
1333 
1334 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1335 			   int unit)
1336 {
1337 	struct fbcon_display *p, *t;
1338 	struct vc_data **default_mode, *vc;
1339 	struct vc_data *svc;
1340 	struct fbcon_ops *ops = info->fbcon_par;
1341 	int rows, cols;
1342 
1343 	p = &fb_display[unit];
1344 
1345 	if (var_to_display(p, var, info))
1346 		return;
1347 
1348 	vc = vc_cons[unit].d;
1349 
1350 	if (!vc)
1351 		return;
1352 
1353 	default_mode = vc->vc_display_fg;
1354 	svc = *default_mode;
1355 	t = &fb_display[svc->vc_num];
1356 
1357 	if (!vc->vc_font.data) {
1358 		vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1359 		vc->vc_font.width = (*default_mode)->vc_font.width;
1360 		vc->vc_font.height = (*default_mode)->vc_font.height;
1361 		vc->vc_font.charcount = (*default_mode)->vc_font.charcount;
1362 		p->userfont = t->userfont;
1363 		if (p->userfont)
1364 			REFCOUNT(p->fontdata)++;
1365 	}
1366 
1367 	var->activate = FB_ACTIVATE_NOW;
1368 	info->var.activate = var->activate;
1369 	var->yoffset = info->var.yoffset;
1370 	var->xoffset = info->var.xoffset;
1371 	fb_set_var(info, var);
1372 	ops->var = info->var;
1373 	vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1374 	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1375 	if (vc->vc_font.charcount == 256) {
1376 		vc->vc_hi_font_mask = 0;
1377 	} else {
1378 		vc->vc_hi_font_mask = 0x100;
1379 		if (vc->vc_can_do_color)
1380 			vc->vc_complement_mask <<= 1;
1381 	}
1382 
1383 	if (!*svc->uni_pagedict_loc)
1384 		con_set_default_unimap(svc);
1385 	if (!*vc->uni_pagedict_loc)
1386 		con_copy_unimap(vc, svc);
1387 
1388 	cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1389 	rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1390 	cols /= vc->vc_font.width;
1391 	rows /= vc->vc_font.height;
1392 	vc_resize(vc, cols, rows);
1393 
1394 	if (con_is_visible(vc)) {
1395 		update_screen(vc);
1396 	}
1397 }
1398 
1399 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1400 {
1401 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1402 	struct fbcon_ops *ops = info->fbcon_par;
1403 	struct fbcon_display *p = &fb_display[vc->vc_num];
1404 
1405 	p->yscroll += count;
1406 	if (p->yscroll >= p->vrows)	/* Deal with wrap */
1407 		p->yscroll -= p->vrows;
1408 	ops->var.xoffset = 0;
1409 	ops->var.yoffset = p->yscroll * vc->vc_font.height;
1410 	ops->var.vmode |= FB_VMODE_YWRAP;
1411 	ops->update_start(info);
1412 	scrollback_max += count;
1413 	if (scrollback_max > scrollback_phys_max)
1414 		scrollback_max = scrollback_phys_max;
1415 	scrollback_current = 0;
1416 }
1417 
1418 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1419 {
1420 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1421 	struct fbcon_ops *ops = info->fbcon_par;
1422 	struct fbcon_display *p = &fb_display[vc->vc_num];
1423 
1424 	p->yscroll -= count;
1425 	if (p->yscroll < 0)	/* Deal with wrap */
1426 		p->yscroll += p->vrows;
1427 	ops->var.xoffset = 0;
1428 	ops->var.yoffset = p->yscroll * vc->vc_font.height;
1429 	ops->var.vmode |= FB_VMODE_YWRAP;
1430 	ops->update_start(info);
1431 	scrollback_max -= count;
1432 	if (scrollback_max < 0)
1433 		scrollback_max = 0;
1434 	scrollback_current = 0;
1435 }
1436 
1437 static __inline__ void ypan_up(struct vc_data *vc, int count)
1438 {
1439 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1440 	struct fbcon_display *p = &fb_display[vc->vc_num];
1441 	struct fbcon_ops *ops = info->fbcon_par;
1442 
1443 	p->yscroll += count;
1444 	if (p->yscroll > p->vrows - vc->vc_rows) {
1445 		ops->bmove(vc, info, p->vrows - vc->vc_rows,
1446 			    0, 0, 0, vc->vc_rows, vc->vc_cols);
1447 		p->yscroll -= p->vrows - vc->vc_rows;
1448 	}
1449 
1450 	ops->var.xoffset = 0;
1451 	ops->var.yoffset = p->yscroll * vc->vc_font.height;
1452 	ops->var.vmode &= ~FB_VMODE_YWRAP;
1453 	ops->update_start(info);
1454 	fbcon_clear_margins(vc, 1);
1455 	scrollback_max += count;
1456 	if (scrollback_max > scrollback_phys_max)
1457 		scrollback_max = scrollback_phys_max;
1458 	scrollback_current = 0;
1459 }
1460 
1461 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1462 {
1463 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1464 	struct fbcon_ops *ops = info->fbcon_par;
1465 	struct fbcon_display *p = &fb_display[vc->vc_num];
1466 
1467 	p->yscroll += count;
1468 
1469 	if (p->yscroll > p->vrows - vc->vc_rows) {
1470 		p->yscroll -= p->vrows - vc->vc_rows;
1471 		fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1472 	}
1473 
1474 	ops->var.xoffset = 0;
1475 	ops->var.yoffset = p->yscroll * vc->vc_font.height;
1476 	ops->var.vmode &= ~FB_VMODE_YWRAP;
1477 	ops->update_start(info);
1478 	fbcon_clear_margins(vc, 1);
1479 	scrollback_max += count;
1480 	if (scrollback_max > scrollback_phys_max)
1481 		scrollback_max = scrollback_phys_max;
1482 	scrollback_current = 0;
1483 }
1484 
1485 static __inline__ void ypan_down(struct vc_data *vc, int count)
1486 {
1487 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1488 	struct fbcon_display *p = &fb_display[vc->vc_num];
1489 	struct fbcon_ops *ops = info->fbcon_par;
1490 
1491 	p->yscroll -= count;
1492 	if (p->yscroll < 0) {
1493 		ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1494 			    0, vc->vc_rows, vc->vc_cols);
1495 		p->yscroll += p->vrows - vc->vc_rows;
1496 	}
1497 
1498 	ops->var.xoffset = 0;
1499 	ops->var.yoffset = p->yscroll * vc->vc_font.height;
1500 	ops->var.vmode &= ~FB_VMODE_YWRAP;
1501 	ops->update_start(info);
1502 	fbcon_clear_margins(vc, 1);
1503 	scrollback_max -= count;
1504 	if (scrollback_max < 0)
1505 		scrollback_max = 0;
1506 	scrollback_current = 0;
1507 }
1508 
1509 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1510 {
1511 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1512 	struct fbcon_ops *ops = info->fbcon_par;
1513 	struct fbcon_display *p = &fb_display[vc->vc_num];
1514 
1515 	p->yscroll -= count;
1516 
1517 	if (p->yscroll < 0) {
1518 		p->yscroll += p->vrows - vc->vc_rows;
1519 		fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1520 	}
1521 
1522 	ops->var.xoffset = 0;
1523 	ops->var.yoffset = p->yscroll * vc->vc_font.height;
1524 	ops->var.vmode &= ~FB_VMODE_YWRAP;
1525 	ops->update_start(info);
1526 	fbcon_clear_margins(vc, 1);
1527 	scrollback_max -= count;
1528 	if (scrollback_max < 0)
1529 		scrollback_max = 0;
1530 	scrollback_current = 0;
1531 }
1532 
1533 static void fbcon_redraw_move(struct vc_data *vc, struct fbcon_display *p,
1534 			      int line, int count, int dy)
1535 {
1536 	unsigned short *s = (unsigned short *)
1537 		(vc->vc_origin + vc->vc_size_row * line);
1538 
1539 	while (count--) {
1540 		unsigned short *start = s;
1541 		unsigned short *le = advance_row(s, 1);
1542 		unsigned short c;
1543 		int x = 0;
1544 		unsigned short attr = 1;
1545 
1546 		do {
1547 			c = scr_readw(s);
1548 			if (attr != (c & 0xff00)) {
1549 				attr = c & 0xff00;
1550 				if (s > start) {
1551 					fbcon_putcs(vc, start, s - start,
1552 						    dy, x);
1553 					x += s - start;
1554 					start = s;
1555 				}
1556 			}
1557 			console_conditional_schedule();
1558 			s++;
1559 		} while (s < le);
1560 		if (s > start)
1561 			fbcon_putcs(vc, start, s - start, dy, x);
1562 		console_conditional_schedule();
1563 		dy++;
1564 	}
1565 }
1566 
1567 static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
1568 			struct fbcon_display *p, int line, int count, int ycount)
1569 {
1570 	int offset = ycount * vc->vc_cols;
1571 	unsigned short *d = (unsigned short *)
1572 	    (vc->vc_origin + vc->vc_size_row * line);
1573 	unsigned short *s = d + offset;
1574 	struct fbcon_ops *ops = info->fbcon_par;
1575 
1576 	while (count--) {
1577 		unsigned short *start = s;
1578 		unsigned short *le = advance_row(s, 1);
1579 		unsigned short c;
1580 		int x = 0;
1581 
1582 		do {
1583 			c = scr_readw(s);
1584 
1585 			if (c == scr_readw(d)) {
1586 				if (s > start) {
1587 					ops->bmove(vc, info, line + ycount, x,
1588 						   line, x, 1, s-start);
1589 					x += s - start + 1;
1590 					start = s + 1;
1591 				} else {
1592 					x++;
1593 					start++;
1594 				}
1595 			}
1596 
1597 			scr_writew(c, d);
1598 			console_conditional_schedule();
1599 			s++;
1600 			d++;
1601 		} while (s < le);
1602 		if (s > start)
1603 			ops->bmove(vc, info, line + ycount, x, line, x, 1,
1604 				   s-start);
1605 		console_conditional_schedule();
1606 		if (ycount > 0)
1607 			line++;
1608 		else {
1609 			line--;
1610 			/* NOTE: We subtract two lines from these pointers */
1611 			s -= vc->vc_size_row;
1612 			d -= vc->vc_size_row;
1613 		}
1614 	}
1615 }
1616 
1617 static void fbcon_redraw(struct vc_data *vc, int line, int count, int offset)
1618 {
1619 	unsigned short *d = (unsigned short *)
1620 	    (vc->vc_origin + vc->vc_size_row * line);
1621 	unsigned short *s = d + offset;
1622 
1623 	while (count--) {
1624 		unsigned short *start = s;
1625 		unsigned short *le = advance_row(s, 1);
1626 		unsigned short c;
1627 		int x = 0;
1628 		unsigned short attr = 1;
1629 
1630 		do {
1631 			c = scr_readw(s);
1632 			if (attr != (c & 0xff00)) {
1633 				attr = c & 0xff00;
1634 				if (s > start) {
1635 					fbcon_putcs(vc, start, s - start,
1636 						    line, x);
1637 					x += s - start;
1638 					start = s;
1639 				}
1640 			}
1641 			if (c == scr_readw(d)) {
1642 				if (s > start) {
1643 					fbcon_putcs(vc, start, s - start,
1644 						     line, x);
1645 					x += s - start + 1;
1646 					start = s + 1;
1647 				} else {
1648 					x++;
1649 					start++;
1650 				}
1651 			}
1652 			scr_writew(c, d);
1653 			console_conditional_schedule();
1654 			s++;
1655 			d++;
1656 		} while (s < le);
1657 		if (s > start)
1658 			fbcon_putcs(vc, start, s - start, line, x);
1659 		console_conditional_schedule();
1660 		if (offset > 0)
1661 			line++;
1662 		else {
1663 			line--;
1664 			/* NOTE: We subtract two lines from these pointers */
1665 			s -= vc->vc_size_row;
1666 			d -= vc->vc_size_row;
1667 		}
1668 	}
1669 }
1670 
1671 static void fbcon_bmove_rec(struct vc_data *vc, struct fbcon_display *p, int sy, int sx,
1672 			    int dy, int dx, int height, int width, u_int y_break)
1673 {
1674 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1675 	struct fbcon_ops *ops = info->fbcon_par;
1676 	u_int b;
1677 
1678 	if (sy < y_break && sy + height > y_break) {
1679 		b = y_break - sy;
1680 		if (dy < sy) {	/* Avoid trashing self */
1681 			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1682 					y_break);
1683 			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1684 					height - b, width, y_break);
1685 		} else {
1686 			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1687 					height - b, width, y_break);
1688 			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1689 					y_break);
1690 		}
1691 		return;
1692 	}
1693 
1694 	if (dy < y_break && dy + height > y_break) {
1695 		b = y_break - dy;
1696 		if (dy < sy) {	/* Avoid trashing self */
1697 			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1698 					y_break);
1699 			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1700 					height - b, width, y_break);
1701 		} else {
1702 			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1703 					height - b, width, y_break);
1704 			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1705 					y_break);
1706 		}
1707 		return;
1708 	}
1709 	ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1710 		   height, width);
1711 }
1712 
1713 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1714 			int height, int width)
1715 {
1716 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1717 	struct fbcon_display *p = &fb_display[vc->vc_num];
1718 
1719 	if (fbcon_is_inactive(vc, info))
1720 		return;
1721 
1722 	if (!width || !height)
1723 		return;
1724 
1725 	/*  Split blits that cross physical y_wrap case.
1726 	 *  Pathological case involves 4 blits, better to use recursive
1727 	 *  code rather than unrolled case
1728 	 *
1729 	 *  Recursive invocations don't need to erase the cursor over and
1730 	 *  over again, so we use fbcon_bmove_rec()
1731 	 */
1732 	fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1733 			p->vrows - p->yscroll);
1734 }
1735 
1736 static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
1737 		enum con_scroll dir, unsigned int count)
1738 {
1739 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1740 	struct fbcon_display *p = &fb_display[vc->vc_num];
1741 	int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1742 
1743 	if (fbcon_is_inactive(vc, info))
1744 		return true;
1745 
1746 	fbcon_cursor(vc, CM_ERASE);
1747 
1748 	/*
1749 	 * ++Geert: Only use ywrap/ypan if the console is in text mode
1750 	 * ++Andrew: Only use ypan on hardware text mode when scrolling the
1751 	 *           whole screen (prevents flicker).
1752 	 */
1753 
1754 	switch (dir) {
1755 	case SM_UP:
1756 		if (count > vc->vc_rows)	/* Maximum realistic size */
1757 			count = vc->vc_rows;
1758 		switch (fb_scrollmode(p)) {
1759 		case SCROLL_MOVE:
1760 			fbcon_redraw_blit(vc, info, p, t, b - t - count,
1761 				     count);
1762 			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1763 			scr_memsetw((unsigned short *) (vc->vc_origin +
1764 							vc->vc_size_row *
1765 							(b - count)),
1766 				    vc->vc_video_erase_char,
1767 				    vc->vc_size_row * count);
1768 			return true;
1769 
1770 		case SCROLL_WRAP_MOVE:
1771 			if (b - t - count > 3 * vc->vc_rows >> 2) {
1772 				if (t > 0)
1773 					fbcon_bmove(vc, 0, 0, count, 0, t,
1774 						    vc->vc_cols);
1775 				ywrap_up(vc, count);
1776 				if (vc->vc_rows - b > 0)
1777 					fbcon_bmove(vc, b - count, 0, b, 0,
1778 						    vc->vc_rows - b,
1779 						    vc->vc_cols);
1780 			} else if (info->flags & FBINFO_READS_FAST)
1781 				fbcon_bmove(vc, t + count, 0, t, 0,
1782 					    b - t - count, vc->vc_cols);
1783 			else
1784 				goto redraw_up;
1785 			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1786 			break;
1787 
1788 		case SCROLL_PAN_REDRAW:
1789 			if ((p->yscroll + count <=
1790 			     2 * (p->vrows - vc->vc_rows))
1791 			    && ((!scroll_partial && (b - t == vc->vc_rows))
1792 				|| (scroll_partial
1793 				    && (b - t - count >
1794 					3 * vc->vc_rows >> 2)))) {
1795 				if (t > 0)
1796 					fbcon_redraw_move(vc, p, 0, t, count);
1797 				ypan_up_redraw(vc, t, count);
1798 				if (vc->vc_rows - b > 0)
1799 					fbcon_redraw_move(vc, p, b,
1800 							  vc->vc_rows - b, b);
1801 			} else
1802 				fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1803 			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1804 			break;
1805 
1806 		case SCROLL_PAN_MOVE:
1807 			if ((p->yscroll + count <=
1808 			     2 * (p->vrows - vc->vc_rows))
1809 			    && ((!scroll_partial && (b - t == vc->vc_rows))
1810 				|| (scroll_partial
1811 				    && (b - t - count >
1812 					3 * vc->vc_rows >> 2)))) {
1813 				if (t > 0)
1814 					fbcon_bmove(vc, 0, 0, count, 0, t,
1815 						    vc->vc_cols);
1816 				ypan_up(vc, count);
1817 				if (vc->vc_rows - b > 0)
1818 					fbcon_bmove(vc, b - count, 0, b, 0,
1819 						    vc->vc_rows - b,
1820 						    vc->vc_cols);
1821 			} else if (info->flags & FBINFO_READS_FAST)
1822 				fbcon_bmove(vc, t + count, 0, t, 0,
1823 					    b - t - count, vc->vc_cols);
1824 			else
1825 				goto redraw_up;
1826 			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1827 			break;
1828 
1829 		case SCROLL_REDRAW:
1830 		      redraw_up:
1831 			fbcon_redraw(vc, t, b - t - count,
1832 				     count * vc->vc_cols);
1833 			fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1834 			scr_memsetw((unsigned short *) (vc->vc_origin +
1835 							vc->vc_size_row *
1836 							(b - count)),
1837 				    vc->vc_video_erase_char,
1838 				    vc->vc_size_row * count);
1839 			return true;
1840 		}
1841 		break;
1842 
1843 	case SM_DOWN:
1844 		if (count > vc->vc_rows)	/* Maximum realistic size */
1845 			count = vc->vc_rows;
1846 		switch (fb_scrollmode(p)) {
1847 		case SCROLL_MOVE:
1848 			fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
1849 				     -count);
1850 			fbcon_clear(vc, t, 0, count, vc->vc_cols);
1851 			scr_memsetw((unsigned short *) (vc->vc_origin +
1852 							vc->vc_size_row *
1853 							t),
1854 				    vc->vc_video_erase_char,
1855 				    vc->vc_size_row * count);
1856 			return true;
1857 
1858 		case SCROLL_WRAP_MOVE:
1859 			if (b - t - count > 3 * vc->vc_rows >> 2) {
1860 				if (vc->vc_rows - b > 0)
1861 					fbcon_bmove(vc, b, 0, b - count, 0,
1862 						    vc->vc_rows - b,
1863 						    vc->vc_cols);
1864 				ywrap_down(vc, count);
1865 				if (t > 0)
1866 					fbcon_bmove(vc, count, 0, 0, 0, t,
1867 						    vc->vc_cols);
1868 			} else if (info->flags & FBINFO_READS_FAST)
1869 				fbcon_bmove(vc, t, 0, t + count, 0,
1870 					    b - t - count, vc->vc_cols);
1871 			else
1872 				goto redraw_down;
1873 			fbcon_clear(vc, t, 0, count, vc->vc_cols);
1874 			break;
1875 
1876 		case SCROLL_PAN_MOVE:
1877 			if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1878 			    && ((!scroll_partial && (b - t == vc->vc_rows))
1879 				|| (scroll_partial
1880 				    && (b - t - count >
1881 					3 * vc->vc_rows >> 2)))) {
1882 				if (vc->vc_rows - b > 0)
1883 					fbcon_bmove(vc, b, 0, b - count, 0,
1884 						    vc->vc_rows - b,
1885 						    vc->vc_cols);
1886 				ypan_down(vc, count);
1887 				if (t > 0)
1888 					fbcon_bmove(vc, count, 0, 0, 0, t,
1889 						    vc->vc_cols);
1890 			} else if (info->flags & FBINFO_READS_FAST)
1891 				fbcon_bmove(vc, t, 0, t + count, 0,
1892 					    b - t - count, vc->vc_cols);
1893 			else
1894 				goto redraw_down;
1895 			fbcon_clear(vc, t, 0, count, vc->vc_cols);
1896 			break;
1897 
1898 		case SCROLL_PAN_REDRAW:
1899 			if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1900 			    && ((!scroll_partial && (b - t == vc->vc_rows))
1901 				|| (scroll_partial
1902 				    && (b - t - count >
1903 					3 * vc->vc_rows >> 2)))) {
1904 				if (vc->vc_rows - b > 0)
1905 					fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1906 							  b - count);
1907 				ypan_down_redraw(vc, t, count);
1908 				if (t > 0)
1909 					fbcon_redraw_move(vc, p, count, t, 0);
1910 			} else
1911 				fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1912 			fbcon_clear(vc, t, 0, count, vc->vc_cols);
1913 			break;
1914 
1915 		case SCROLL_REDRAW:
1916 		      redraw_down:
1917 			fbcon_redraw(vc, b - 1, b - t - count,
1918 				     -count * vc->vc_cols);
1919 			fbcon_clear(vc, t, 0, count, vc->vc_cols);
1920 			scr_memsetw((unsigned short *) (vc->vc_origin +
1921 							vc->vc_size_row *
1922 							t),
1923 				    vc->vc_video_erase_char,
1924 				    vc->vc_size_row * count);
1925 			return true;
1926 		}
1927 	}
1928 	return false;
1929 }
1930 
1931 
1932 static void updatescrollmode_accel(struct fbcon_display *p,
1933 					struct fb_info *info,
1934 					struct vc_data *vc)
1935 {
1936 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
1937 	struct fbcon_ops *ops = info->fbcon_par;
1938 	int cap = info->flags;
1939 	u16 t = 0;
1940 	int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
1941 				  info->fix.xpanstep);
1942 	int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
1943 	int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1944 	int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1945 				   info->var.xres_virtual);
1946 	int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
1947 		divides(ypan, vc->vc_font.height) && vyres > yres;
1948 	int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
1949 		divides(ywrap, vc->vc_font.height) &&
1950 		divides(vc->vc_font.height, vyres) &&
1951 		divides(vc->vc_font.height, yres);
1952 	int reading_fast = cap & FBINFO_READS_FAST;
1953 	int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
1954 		!(cap & FBINFO_HWACCEL_DISABLED);
1955 	int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
1956 		!(cap & FBINFO_HWACCEL_DISABLED);
1957 
1958 	if (good_wrap || good_pan) {
1959 		if (reading_fast || fast_copyarea)
1960 			p->scrollmode = good_wrap ?
1961 				SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1962 		else
1963 			p->scrollmode = good_wrap ? SCROLL_REDRAW :
1964 				SCROLL_PAN_REDRAW;
1965 	} else {
1966 		if (reading_fast || (fast_copyarea && !fast_imageblit))
1967 			p->scrollmode = SCROLL_MOVE;
1968 		else
1969 			p->scrollmode = SCROLL_REDRAW;
1970 	}
1971 #endif
1972 }
1973 
1974 static void updatescrollmode(struct fbcon_display *p,
1975 					struct fb_info *info,
1976 					struct vc_data *vc)
1977 {
1978 	struct fbcon_ops *ops = info->fbcon_par;
1979 	int fh = vc->vc_font.height;
1980 	int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1981 	int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1982 				   info->var.xres_virtual);
1983 
1984 	p->vrows = vyres/fh;
1985 	if (yres > (fh * (vc->vc_rows + 1)))
1986 		p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
1987 	if ((yres % fh) && (vyres % fh < yres % fh))
1988 		p->vrows--;
1989 
1990 	/* update scrollmode in case hardware acceleration is used */
1991 	updatescrollmode_accel(p, info, vc);
1992 }
1993 
1994 #define PITCH(w) (((w) + 7) >> 3)
1995 #define CALC_FONTSZ(h, p, c) ((h) * (p) * (c)) /* size = height * pitch * charcount */
1996 
1997 static int fbcon_resize(struct vc_data *vc, unsigned int width,
1998 			unsigned int height, unsigned int user)
1999 {
2000 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2001 	struct fbcon_ops *ops = info->fbcon_par;
2002 	struct fbcon_display *p = &fb_display[vc->vc_num];
2003 	struct fb_var_screeninfo var = info->var;
2004 	int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2005 
2006 	if (p->userfont && FNTSIZE(vc->vc_font.data)) {
2007 		int size;
2008 		int pitch = PITCH(vc->vc_font.width);
2009 
2010 		/*
2011 		 * If user font, ensure that a possible change to user font
2012 		 * height or width will not allow a font data out-of-bounds access.
2013 		 * NOTE: must use original charcount in calculation as font
2014 		 * charcount can change and cannot be used to determine the
2015 		 * font data allocated size.
2016 		 */
2017 		if (pitch <= 0)
2018 			return -EINVAL;
2019 		size = CALC_FONTSZ(vc->vc_font.height, pitch, vc->vc_font.charcount);
2020 		if (size > FNTSIZE(vc->vc_font.data))
2021 			return -EINVAL;
2022 	}
2023 
2024 	virt_w = FBCON_SWAP(ops->rotate, width, height);
2025 	virt_h = FBCON_SWAP(ops->rotate, height, width);
2026 	virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2027 				 vc->vc_font.height);
2028 	virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2029 				 vc->vc_font.width);
2030 	var.xres = virt_w * virt_fw;
2031 	var.yres = virt_h * virt_fh;
2032 	x_diff = info->var.xres - var.xres;
2033 	y_diff = info->var.yres - var.yres;
2034 	if (x_diff < 0 || x_diff > virt_fw ||
2035 	    y_diff < 0 || y_diff > virt_fh) {
2036 		const struct fb_videomode *mode;
2037 
2038 		pr_debug("attempting resize %ix%i\n", var.xres, var.yres);
2039 		mode = fb_find_best_mode(&var, &info->modelist);
2040 		if (mode == NULL)
2041 			return -EINVAL;
2042 		display_to_var(&var, p);
2043 		fb_videomode_to_var(&var, mode);
2044 
2045 		if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2046 			return -EINVAL;
2047 
2048 		pr_debug("resize now %ix%i\n", var.xres, var.yres);
2049 		if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
2050 			var.activate = FB_ACTIVATE_NOW |
2051 				FB_ACTIVATE_FORCE;
2052 			fb_set_var(info, &var);
2053 		}
2054 		var_to_display(p, &info->var, info);
2055 		ops->var = info->var;
2056 	}
2057 	updatescrollmode(p, info, vc);
2058 	return 0;
2059 }
2060 
2061 static int fbcon_switch(struct vc_data *vc)
2062 {
2063 	struct fb_info *info, *old_info = NULL;
2064 	struct fbcon_ops *ops;
2065 	struct fbcon_display *p = &fb_display[vc->vc_num];
2066 	struct fb_var_screeninfo var;
2067 	int i, ret, prev_console;
2068 
2069 	info = fbcon_info_from_console(vc->vc_num);
2070 	ops = info->fbcon_par;
2071 
2072 	if (logo_shown >= 0) {
2073 		struct vc_data *conp2 = vc_cons[logo_shown].d;
2074 
2075 		if (conp2->vc_top == logo_lines
2076 		    && conp2->vc_bottom == conp2->vc_rows)
2077 			conp2->vc_top = 0;
2078 		logo_shown = FBCON_LOGO_CANSHOW;
2079 	}
2080 
2081 	prev_console = ops->currcon;
2082 	if (prev_console != -1)
2083 		old_info = fbcon_info_from_console(prev_console);
2084 	/*
2085 	 * FIXME: If we have multiple fbdev's loaded, we need to
2086 	 * update all info->currcon.  Perhaps, we can place this
2087 	 * in a centralized structure, but this might break some
2088 	 * drivers.
2089 	 *
2090 	 * info->currcon = vc->vc_num;
2091 	 */
2092 	fbcon_for_each_registered_fb(i) {
2093 		if (fbcon_registered_fb[i]->fbcon_par) {
2094 			struct fbcon_ops *o = fbcon_registered_fb[i]->fbcon_par;
2095 
2096 			o->currcon = vc->vc_num;
2097 		}
2098 	}
2099 	memset(&var, 0, sizeof(struct fb_var_screeninfo));
2100 	display_to_var(&var, p);
2101 	var.activate = FB_ACTIVATE_NOW;
2102 
2103 	/*
2104 	 * make sure we don't unnecessarily trip the memcmp()
2105 	 * in fb_set_var()
2106 	 */
2107 	info->var.activate = var.activate;
2108 	var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
2109 	fb_set_var(info, &var);
2110 	ops->var = info->var;
2111 
2112 	if (old_info != NULL && (old_info != info ||
2113 				 info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2114 		if (info->fbops->fb_set_par) {
2115 			ret = info->fbops->fb_set_par(info);
2116 
2117 			if (ret)
2118 				printk(KERN_ERR "fbcon_switch: detected "
2119 					"unhandled fb_set_par error, "
2120 					"error code %d\n", ret);
2121 		}
2122 
2123 		if (old_info != info)
2124 			fbcon_del_cursor_work(old_info);
2125 	}
2126 
2127 	if (fbcon_is_inactive(vc, info) ||
2128 	    ops->blank_state != FB_BLANK_UNBLANK)
2129 		fbcon_del_cursor_work(info);
2130 	else
2131 		fbcon_add_cursor_work(info);
2132 
2133 	set_blitting_type(vc, info);
2134 	ops->cursor_reset = 1;
2135 
2136 	if (ops->rotate_font && ops->rotate_font(info, vc)) {
2137 		ops->rotate = FB_ROTATE_UR;
2138 		set_blitting_type(vc, info);
2139 	}
2140 
2141 	vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2142 	vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2143 
2144 	if (vc->vc_font.charcount > 256)
2145 		vc->vc_complement_mask <<= 1;
2146 
2147 	updatescrollmode(p, info, vc);
2148 
2149 	switch (fb_scrollmode(p)) {
2150 	case SCROLL_WRAP_MOVE:
2151 		scrollback_phys_max = p->vrows - vc->vc_rows;
2152 		break;
2153 	case SCROLL_PAN_MOVE:
2154 	case SCROLL_PAN_REDRAW:
2155 		scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2156 		if (scrollback_phys_max < 0)
2157 			scrollback_phys_max = 0;
2158 		break;
2159 	default:
2160 		scrollback_phys_max = 0;
2161 		break;
2162 	}
2163 
2164 	scrollback_max = 0;
2165 	scrollback_current = 0;
2166 
2167 	if (!fbcon_is_inactive(vc, info)) {
2168 	    ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2169 	    ops->update_start(info);
2170 	}
2171 
2172 	fbcon_set_palette(vc, color_table);
2173 	fbcon_clear_margins(vc, 0);
2174 
2175 	if (logo_shown == FBCON_LOGO_DRAW) {
2176 
2177 		logo_shown = fg_console;
2178 		fb_show_logo(info, ops->rotate);
2179 		update_region(vc,
2180 			      vc->vc_origin + vc->vc_size_row * vc->vc_top,
2181 			      vc->vc_size_row * (vc->vc_bottom -
2182 						 vc->vc_top) / 2);
2183 		return 0;
2184 	}
2185 	return 1;
2186 }
2187 
2188 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2189 				int blank)
2190 {
2191 	if (blank) {
2192 		unsigned short charmask = vc->vc_hi_font_mask ?
2193 			0x1ff : 0xff;
2194 		unsigned short oldc;
2195 
2196 		oldc = vc->vc_video_erase_char;
2197 		vc->vc_video_erase_char &= charmask;
2198 		fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2199 		vc->vc_video_erase_char = oldc;
2200 	}
2201 }
2202 
2203 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2204 {
2205 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2206 	struct fbcon_ops *ops = info->fbcon_par;
2207 
2208 	if (mode_switch) {
2209 		struct fb_var_screeninfo var = info->var;
2210 
2211 		ops->graphics = 1;
2212 
2213 		if (!blank) {
2214 			var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE |
2215 				FB_ACTIVATE_KD_TEXT;
2216 			fb_set_var(info, &var);
2217 			ops->graphics = 0;
2218 			ops->var = info->var;
2219 		}
2220 	}
2221 
2222  	if (!fbcon_is_inactive(vc, info)) {
2223 		if (ops->blank_state != blank) {
2224 			ops->blank_state = blank;
2225 			fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2226 			ops->cursor_flash = (!blank);
2227 
2228 			if (fb_blank(info, blank))
2229 				fbcon_generic_blank(vc, info, blank);
2230 		}
2231 
2232 		if (!blank)
2233 			update_screen(vc);
2234 	}
2235 
2236 	if (mode_switch || fbcon_is_inactive(vc, info) ||
2237 	    ops->blank_state != FB_BLANK_UNBLANK)
2238 		fbcon_del_cursor_work(info);
2239 	else
2240 		fbcon_add_cursor_work(info);
2241 
2242 	return 0;
2243 }
2244 
2245 static int fbcon_debug_enter(struct vc_data *vc)
2246 {
2247 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2248 	struct fbcon_ops *ops = info->fbcon_par;
2249 
2250 	ops->save_graphics = ops->graphics;
2251 	ops->graphics = 0;
2252 	if (info->fbops->fb_debug_enter)
2253 		info->fbops->fb_debug_enter(info);
2254 	fbcon_set_palette(vc, color_table);
2255 	return 0;
2256 }
2257 
2258 static int fbcon_debug_leave(struct vc_data *vc)
2259 {
2260 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2261 	struct fbcon_ops *ops = info->fbcon_par;
2262 
2263 	ops->graphics = ops->save_graphics;
2264 	if (info->fbops->fb_debug_leave)
2265 		info->fbops->fb_debug_leave(info);
2266 	return 0;
2267 }
2268 
2269 static int fbcon_get_font(struct vc_data *vc, struct console_font *font, unsigned int vpitch)
2270 {
2271 	u8 *fontdata = vc->vc_font.data;
2272 	u8 *data = font->data;
2273 	int i, j;
2274 
2275 	font->width = vc->vc_font.width;
2276 	font->height = vc->vc_font.height;
2277 	if (font->height > vpitch)
2278 		return -ENOSPC;
2279 	font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2280 	if (!font->data)
2281 		return 0;
2282 
2283 	if (font->width <= 8) {
2284 		j = vc->vc_font.height;
2285 		if (font->charcount * j > FNTSIZE(fontdata))
2286 			return -EINVAL;
2287 
2288 		for (i = 0; i < font->charcount; i++) {
2289 			memcpy(data, fontdata, j);
2290 			memset(data + j, 0, vpitch - j);
2291 			data += vpitch;
2292 			fontdata += j;
2293 		}
2294 	} else if (font->width <= 16) {
2295 		j = vc->vc_font.height * 2;
2296 		if (font->charcount * j > FNTSIZE(fontdata))
2297 			return -EINVAL;
2298 
2299 		for (i = 0; i < font->charcount; i++) {
2300 			memcpy(data, fontdata, j);
2301 			memset(data + j, 0, 2*vpitch - j);
2302 			data += 2*vpitch;
2303 			fontdata += j;
2304 		}
2305 	} else if (font->width <= 24) {
2306 		if (font->charcount * (vc->vc_font.height * sizeof(u32)) > FNTSIZE(fontdata))
2307 			return -EINVAL;
2308 
2309 		for (i = 0; i < font->charcount; i++) {
2310 			for (j = 0; j < vc->vc_font.height; j++) {
2311 				*data++ = fontdata[0];
2312 				*data++ = fontdata[1];
2313 				*data++ = fontdata[2];
2314 				fontdata += sizeof(u32);
2315 			}
2316 			memset(data, 0, 3 * (vpitch - j));
2317 			data += 3 * (vpitch - j);
2318 		}
2319 	} else {
2320 		j = vc->vc_font.height * 4;
2321 		if (font->charcount * j > FNTSIZE(fontdata))
2322 			return -EINVAL;
2323 
2324 		for (i = 0; i < font->charcount; i++) {
2325 			memcpy(data, fontdata, j);
2326 			memset(data + j, 0, 4 * vpitch - j);
2327 			data += 4 * vpitch;
2328 			fontdata += j;
2329 		}
2330 	}
2331 	return 0;
2332 }
2333 
2334 /* set/clear vc_hi_font_mask and update vc attrs accordingly */
2335 static void set_vc_hi_font(struct vc_data *vc, bool set)
2336 {
2337 	if (!set) {
2338 		vc->vc_hi_font_mask = 0;
2339 		if (vc->vc_can_do_color) {
2340 			vc->vc_complement_mask >>= 1;
2341 			vc->vc_s_complement_mask >>= 1;
2342 		}
2343 
2344 		/* ++Edmund: reorder the attribute bits */
2345 		if (vc->vc_can_do_color) {
2346 			unsigned short *cp =
2347 			    (unsigned short *) vc->vc_origin;
2348 			int count = vc->vc_screenbuf_size / 2;
2349 			unsigned short c;
2350 			for (; count > 0; count--, cp++) {
2351 				c = scr_readw(cp);
2352 				scr_writew(((c & 0xfe00) >> 1) |
2353 					   (c & 0xff), cp);
2354 			}
2355 			c = vc->vc_video_erase_char;
2356 			vc->vc_video_erase_char =
2357 			    ((c & 0xfe00) >> 1) | (c & 0xff);
2358 			vc->vc_attr >>= 1;
2359 		}
2360 	} else {
2361 		vc->vc_hi_font_mask = 0x100;
2362 		if (vc->vc_can_do_color) {
2363 			vc->vc_complement_mask <<= 1;
2364 			vc->vc_s_complement_mask <<= 1;
2365 		}
2366 
2367 		/* ++Edmund: reorder the attribute bits */
2368 		{
2369 			unsigned short *cp =
2370 			    (unsigned short *) vc->vc_origin;
2371 			int count = vc->vc_screenbuf_size / 2;
2372 			unsigned short c;
2373 			for (; count > 0; count--, cp++) {
2374 				unsigned short newc;
2375 				c = scr_readw(cp);
2376 				if (vc->vc_can_do_color)
2377 					newc =
2378 					    ((c & 0xff00) << 1) | (c &
2379 								   0xff);
2380 				else
2381 					newc = c & ~0x100;
2382 				scr_writew(newc, cp);
2383 			}
2384 			c = vc->vc_video_erase_char;
2385 			if (vc->vc_can_do_color) {
2386 				vc->vc_video_erase_char =
2387 				    ((c & 0xff00) << 1) | (c & 0xff);
2388 				vc->vc_attr <<= 1;
2389 			} else
2390 				vc->vc_video_erase_char = c & ~0x100;
2391 		}
2392 	}
2393 }
2394 
2395 static int fbcon_do_set_font(struct vc_data *vc, int w, int h, int charcount,
2396 			     const u8 * data, int userfont)
2397 {
2398 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2399 	struct fbcon_ops *ops = info->fbcon_par;
2400 	struct fbcon_display *p = &fb_display[vc->vc_num];
2401 	int resize, ret, old_userfont, old_width, old_height, old_charcount;
2402 	u8 *old_data = vc->vc_font.data;
2403 
2404 	resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2405 	vc->vc_font.data = (void *)(p->fontdata = data);
2406 	old_userfont = p->userfont;
2407 	if ((p->userfont = userfont))
2408 		REFCOUNT(data)++;
2409 
2410 	old_width = vc->vc_font.width;
2411 	old_height = vc->vc_font.height;
2412 	old_charcount = vc->vc_font.charcount;
2413 
2414 	vc->vc_font.width = w;
2415 	vc->vc_font.height = h;
2416 	vc->vc_font.charcount = charcount;
2417 	if (vc->vc_hi_font_mask && charcount == 256)
2418 		set_vc_hi_font(vc, false);
2419 	else if (!vc->vc_hi_font_mask && charcount == 512)
2420 		set_vc_hi_font(vc, true);
2421 
2422 	if (resize) {
2423 		int cols, rows;
2424 
2425 		cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2426 		rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2427 		cols /= w;
2428 		rows /= h;
2429 		ret = vc_resize(vc, cols, rows);
2430 		if (ret)
2431 			goto err_out;
2432 	} else if (con_is_visible(vc)
2433 		   && vc->vc_mode == KD_TEXT) {
2434 		fbcon_clear_margins(vc, 0);
2435 		update_screen(vc);
2436 	}
2437 
2438 	if (old_userfont && (--REFCOUNT(old_data) == 0))
2439 		kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2440 	return 0;
2441 
2442 err_out:
2443 	p->fontdata = old_data;
2444 	vc->vc_font.data = old_data;
2445 
2446 	if (userfont) {
2447 		p->userfont = old_userfont;
2448 		if (--REFCOUNT(data) == 0)
2449 			kfree(data - FONT_EXTRA_WORDS * sizeof(int));
2450 	}
2451 
2452 	vc->vc_font.width = old_width;
2453 	vc->vc_font.height = old_height;
2454 	vc->vc_font.charcount = old_charcount;
2455 
2456 	return ret;
2457 }
2458 
2459 /*
2460  *  User asked to set font; we are guaranteed that charcount does not exceed 512
2461  *  but lets not assume that, since charcount of 512 is small for unicode support.
2462  */
2463 
2464 static int fbcon_set_font(struct vc_data *vc, struct console_font *font,
2465 			  unsigned int vpitch, unsigned int flags)
2466 {
2467 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2468 	unsigned charcount = font->charcount;
2469 	int w = font->width;
2470 	int h = font->height;
2471 	int size;
2472 	int i, csum;
2473 	u8 *new_data, *data = font->data;
2474 	int pitch = PITCH(font->width);
2475 
2476 	/* Is there a reason why fbconsole couldn't handle any charcount >256?
2477 	 * If not this check should be changed to charcount < 256 */
2478 	if (charcount != 256 && charcount != 512)
2479 		return -EINVAL;
2480 
2481 	/* font bigger than screen resolution ? */
2482 	if (w > FBCON_SWAP(info->var.rotate, info->var.xres, info->var.yres) ||
2483 	    h > FBCON_SWAP(info->var.rotate, info->var.yres, info->var.xres))
2484 		return -EINVAL;
2485 
2486 	if (font->width > 32 || font->height > 32)
2487 		return -EINVAL;
2488 
2489 	/* Make sure drawing engine can handle the font */
2490 	if (!(info->pixmap.blit_x & BIT(font->width - 1)) ||
2491 	    !(info->pixmap.blit_y & BIT(font->height - 1)))
2492 		return -EINVAL;
2493 
2494 	/* Make sure driver can handle the font length */
2495 	if (fbcon_invalid_charcount(info, charcount))
2496 		return -EINVAL;
2497 
2498 	size = CALC_FONTSZ(h, pitch, charcount);
2499 
2500 	new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2501 
2502 	if (!new_data)
2503 		return -ENOMEM;
2504 
2505 	memset(new_data, 0, FONT_EXTRA_WORDS * sizeof(int));
2506 
2507 	new_data += FONT_EXTRA_WORDS * sizeof(int);
2508 	FNTSIZE(new_data) = size;
2509 	REFCOUNT(new_data) = 0;	/* usage counter */
2510 	for (i=0; i< charcount; i++) {
2511 		memcpy(new_data + i*h*pitch, data +  i*vpitch*pitch, h*pitch);
2512 	}
2513 
2514 	/* Since linux has a nice crc32 function use it for counting font
2515 	 * checksums. */
2516 	csum = crc32(0, new_data, size);
2517 
2518 	FNTSUM(new_data) = csum;
2519 	/* Check if the same font is on some other console already */
2520 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
2521 		struct vc_data *tmp = vc_cons[i].d;
2522 
2523 		if (fb_display[i].userfont &&
2524 		    fb_display[i].fontdata &&
2525 		    FNTSUM(fb_display[i].fontdata) == csum &&
2526 		    FNTSIZE(fb_display[i].fontdata) == size &&
2527 		    tmp->vc_font.width == w &&
2528 		    !memcmp(fb_display[i].fontdata, new_data, size)) {
2529 			kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2530 			new_data = (u8 *)fb_display[i].fontdata;
2531 			break;
2532 		}
2533 	}
2534 	return fbcon_do_set_font(vc, font->width, font->height, charcount, new_data, 1);
2535 }
2536 
2537 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2538 {
2539 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2540 	const struct font_desc *f;
2541 
2542 	if (!name)
2543 		f = get_default_font(info->var.xres, info->var.yres,
2544 				     info->pixmap.blit_x, info->pixmap.blit_y);
2545 	else if (!(f = find_font(name)))
2546 		return -ENOENT;
2547 
2548 	font->width = f->width;
2549 	font->height = f->height;
2550 	return fbcon_do_set_font(vc, f->width, f->height, f->charcount, f->data, 0);
2551 }
2552 
2553 static u16 palette_red[16];
2554 static u16 palette_green[16];
2555 static u16 palette_blue[16];
2556 
2557 static struct fb_cmap palette_cmap = {
2558 	0, 16, palette_red, palette_green, palette_blue, NULL
2559 };
2560 
2561 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
2562 {
2563 	struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2564 	int i, j, k, depth;
2565 	u8 val;
2566 
2567 	if (fbcon_is_inactive(vc, info))
2568 		return;
2569 
2570 	if (!con_is_visible(vc))
2571 		return;
2572 
2573 	depth = fb_get_color_depth(&info->var, &info->fix);
2574 	if (depth > 3) {
2575 		for (i = j = 0; i < 16; i++) {
2576 			k = table[i];
2577 			val = vc->vc_palette[j++];
2578 			palette_red[k] = (val << 8) | val;
2579 			val = vc->vc_palette[j++];
2580 			palette_green[k] = (val << 8) | val;
2581 			val = vc->vc_palette[j++];
2582 			palette_blue[k] = (val << 8) | val;
2583 		}
2584 		palette_cmap.len = 16;
2585 		palette_cmap.start = 0;
2586 	/*
2587 	 * If framebuffer is capable of less than 16 colors,
2588 	 * use default palette of fbcon.
2589 	 */
2590 	} else
2591 		fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2592 
2593 	fb_set_cmap(&palette_cmap, info);
2594 }
2595 
2596 static u16 *fbcon_screen_pos(const struct vc_data *vc, int offset)
2597 {
2598 	return (u16 *) (vc->vc_origin + offset);
2599 }
2600 
2601 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2602 				 int *px, int *py)
2603 {
2604 	unsigned long ret;
2605 	int x, y;
2606 
2607 	if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2608 		unsigned long offset = (pos - vc->vc_origin) / 2;
2609 
2610 		x = offset % vc->vc_cols;
2611 		y = offset / vc->vc_cols;
2612 		ret = pos + (vc->vc_cols - x) * 2;
2613 	} else {
2614 		/* Should not happen */
2615 		x = y = 0;
2616 		ret = vc->vc_origin;
2617 	}
2618 	if (px)
2619 		*px = x;
2620 	if (py)
2621 		*py = y;
2622 	return ret;
2623 }
2624 
2625 /* As we might be inside of softback, we may work with non-contiguous buffer,
2626    that's why we have to use a separate routine. */
2627 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2628 {
2629 	while (cnt--) {
2630 		u16 a = scr_readw(p);
2631 		if (!vc->vc_can_do_color)
2632 			a ^= 0x0800;
2633 		else if (vc->vc_hi_font_mask == 0x100)
2634 			a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2635 			    (((a) & 0x0e00) << 4);
2636 		else
2637 			a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2638 			    (((a) & 0x0700) << 4);
2639 		scr_writew(a, p++);
2640 	}
2641 }
2642 
2643 void fbcon_suspended(struct fb_info *info)
2644 {
2645 	struct vc_data *vc = NULL;
2646 	struct fbcon_ops *ops = info->fbcon_par;
2647 
2648 	if (!ops || ops->currcon < 0)
2649 		return;
2650 	vc = vc_cons[ops->currcon].d;
2651 
2652 	/* Clear cursor, restore saved data */
2653 	fbcon_cursor(vc, CM_ERASE);
2654 }
2655 
2656 void fbcon_resumed(struct fb_info *info)
2657 {
2658 	struct vc_data *vc;
2659 	struct fbcon_ops *ops = info->fbcon_par;
2660 
2661 	if (!ops || ops->currcon < 0)
2662 		return;
2663 	vc = vc_cons[ops->currcon].d;
2664 
2665 	update_screen(vc);
2666 }
2667 
2668 static void fbcon_modechanged(struct fb_info *info)
2669 {
2670 	struct fbcon_ops *ops = info->fbcon_par;
2671 	struct vc_data *vc;
2672 	struct fbcon_display *p;
2673 	int rows, cols;
2674 
2675 	if (!ops || ops->currcon < 0)
2676 		return;
2677 	vc = vc_cons[ops->currcon].d;
2678 	if (vc->vc_mode != KD_TEXT ||
2679 	    fbcon_info_from_console(ops->currcon) != info)
2680 		return;
2681 
2682 	p = &fb_display[vc->vc_num];
2683 	set_blitting_type(vc, info);
2684 
2685 	if (con_is_visible(vc)) {
2686 		var_to_display(p, &info->var, info);
2687 		cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2688 		rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2689 		cols /= vc->vc_font.width;
2690 		rows /= vc->vc_font.height;
2691 		vc_resize(vc, cols, rows);
2692 		updatescrollmode(p, info, vc);
2693 		scrollback_max = 0;
2694 		scrollback_current = 0;
2695 
2696 		if (!fbcon_is_inactive(vc, info)) {
2697 		    ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2698 		    ops->update_start(info);
2699 		}
2700 
2701 		fbcon_set_palette(vc, color_table);
2702 		update_screen(vc);
2703 	}
2704 }
2705 
2706 static void fbcon_set_all_vcs(struct fb_info *info)
2707 {
2708 	struct fbcon_ops *ops = info->fbcon_par;
2709 	struct vc_data *vc;
2710 	struct fbcon_display *p;
2711 	int i, rows, cols, fg = -1;
2712 
2713 	if (!ops || ops->currcon < 0)
2714 		return;
2715 
2716 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
2717 		vc = vc_cons[i].d;
2718 		if (!vc || vc->vc_mode != KD_TEXT ||
2719 		    fbcon_info_from_console(i) != info)
2720 			continue;
2721 
2722 		if (con_is_visible(vc)) {
2723 			fg = i;
2724 			continue;
2725 		}
2726 
2727 		p = &fb_display[vc->vc_num];
2728 		set_blitting_type(vc, info);
2729 		var_to_display(p, &info->var, info);
2730 		cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2731 		rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2732 		cols /= vc->vc_font.width;
2733 		rows /= vc->vc_font.height;
2734 		vc_resize(vc, cols, rows);
2735 	}
2736 
2737 	if (fg != -1)
2738 		fbcon_modechanged(info);
2739 }
2740 
2741 
2742 void fbcon_update_vcs(struct fb_info *info, bool all)
2743 {
2744 	if (all)
2745 		fbcon_set_all_vcs(info);
2746 	else
2747 		fbcon_modechanged(info);
2748 }
2749 EXPORT_SYMBOL(fbcon_update_vcs);
2750 
2751 /* let fbcon check if it supports a new screen resolution */
2752 int fbcon_modechange_possible(struct fb_info *info, struct fb_var_screeninfo *var)
2753 {
2754 	struct fbcon_ops *ops = info->fbcon_par;
2755 	struct vc_data *vc;
2756 	unsigned int i;
2757 
2758 	WARN_CONSOLE_UNLOCKED();
2759 
2760 	if (!ops)
2761 		return 0;
2762 
2763 	/* prevent setting a screen size which is smaller than font size */
2764 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
2765 		vc = vc_cons[i].d;
2766 		if (!vc || vc->vc_mode != KD_TEXT ||
2767 			   fbcon_info_from_console(i) != info)
2768 			continue;
2769 
2770 		if (vc->vc_font.width  > FBCON_SWAP(var->rotate, var->xres, var->yres) ||
2771 		    vc->vc_font.height > FBCON_SWAP(var->rotate, var->yres, var->xres))
2772 			return -EINVAL;
2773 	}
2774 
2775 	return 0;
2776 }
2777 EXPORT_SYMBOL_GPL(fbcon_modechange_possible);
2778 
2779 int fbcon_mode_deleted(struct fb_info *info,
2780 		       struct fb_videomode *mode)
2781 {
2782 	struct fb_info *fb_info;
2783 	struct fbcon_display *p;
2784 	int i, j, found = 0;
2785 
2786 	/* before deletion, ensure that mode is not in use */
2787 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
2788 		j = con2fb_map[i];
2789 		if (j == -1)
2790 			continue;
2791 		fb_info = fbcon_registered_fb[j];
2792 		if (fb_info != info)
2793 			continue;
2794 		p = &fb_display[i];
2795 		if (!p || !p->mode)
2796 			continue;
2797 		if (fb_mode_is_equal(p->mode, mode)) {
2798 			found = 1;
2799 			break;
2800 		}
2801 	}
2802 	return found;
2803 }
2804 
2805 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2806 static void fbcon_unbind(void)
2807 {
2808 	int ret;
2809 
2810 	ret = do_unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
2811 				fbcon_is_default);
2812 
2813 	if (!ret)
2814 		fbcon_has_console_bind = 0;
2815 }
2816 #else
2817 static inline void fbcon_unbind(void) {}
2818 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
2819 
2820 void fbcon_fb_unbind(struct fb_info *info)
2821 {
2822 	int i, new_idx = -1;
2823 	int idx = info->node;
2824 
2825 	console_lock();
2826 
2827 	if (!fbcon_has_console_bind) {
2828 		console_unlock();
2829 		return;
2830 	}
2831 
2832 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
2833 		if (con2fb_map[i] != idx &&
2834 		    con2fb_map[i] != -1) {
2835 			new_idx = con2fb_map[i];
2836 			break;
2837 		}
2838 	}
2839 
2840 	if (new_idx != -1) {
2841 		for (i = first_fb_vc; i <= last_fb_vc; i++) {
2842 			if (con2fb_map[i] == idx)
2843 				set_con2fb_map(i, new_idx, 0);
2844 		}
2845 	} else {
2846 		struct fb_info *info = fbcon_registered_fb[idx];
2847 
2848 		/* This is sort of like set_con2fb_map, except it maps
2849 		 * the consoles to no device and then releases the
2850 		 * oldinfo to free memory and cancel the cursor blink
2851 		 * timer. I can imagine this just becoming part of
2852 		 * set_con2fb_map where new_idx is -1
2853 		 */
2854 		for (i = first_fb_vc; i <= last_fb_vc; i++) {
2855 			if (con2fb_map[i] == idx) {
2856 				con2fb_map[i] = -1;
2857 				if (!search_fb_in_map(idx)) {
2858 					con2fb_release_oldinfo(vc_cons[i].d,
2859 							       info, NULL);
2860 				}
2861 			}
2862 		}
2863 		fbcon_unbind();
2864 	}
2865 
2866 	console_unlock();
2867 }
2868 
2869 void fbcon_fb_unregistered(struct fb_info *info)
2870 {
2871 	int i, idx;
2872 
2873 	console_lock();
2874 
2875 	fbcon_registered_fb[info->node] = NULL;
2876 	fbcon_num_registered_fb--;
2877 
2878 	if (deferred_takeover) {
2879 		console_unlock();
2880 		return;
2881 	}
2882 
2883 	idx = info->node;
2884 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
2885 		if (con2fb_map[i] == idx)
2886 			con2fb_map[i] = -1;
2887 	}
2888 
2889 	if (idx == info_idx) {
2890 		info_idx = -1;
2891 
2892 		fbcon_for_each_registered_fb(i) {
2893 			info_idx = i;
2894 			break;
2895 		}
2896 	}
2897 
2898 	if (info_idx != -1) {
2899 		for (i = first_fb_vc; i <= last_fb_vc; i++) {
2900 			if (con2fb_map[i] == -1)
2901 				con2fb_map[i] = info_idx;
2902 		}
2903 	}
2904 
2905 	if (primary_device == idx)
2906 		primary_device = -1;
2907 
2908 	if (!fbcon_num_registered_fb)
2909 		do_unregister_con_driver(&fb_con);
2910 	console_unlock();
2911 }
2912 
2913 void fbcon_remap_all(struct fb_info *info)
2914 {
2915 	int i, idx = info->node;
2916 
2917 	console_lock();
2918 	if (deferred_takeover) {
2919 		for (i = first_fb_vc; i <= last_fb_vc; i++)
2920 			con2fb_map_boot[i] = idx;
2921 		fbcon_map_override();
2922 		console_unlock();
2923 		return;
2924 	}
2925 
2926 	for (i = first_fb_vc; i <= last_fb_vc; i++)
2927 		set_con2fb_map(i, idx, 0);
2928 
2929 	if (con_is_bound(&fb_con)) {
2930 		printk(KERN_INFO "fbcon: Remapping primary device, "
2931 		       "fb%i, to tty %i-%i\n", idx,
2932 		       first_fb_vc + 1, last_fb_vc + 1);
2933 		info_idx = idx;
2934 	}
2935 	console_unlock();
2936 }
2937 
2938 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
2939 static void fbcon_select_primary(struct fb_info *info)
2940 {
2941 	if (!map_override && primary_device == -1 &&
2942 	    fb_is_primary_device(info)) {
2943 		int i;
2944 
2945 		printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
2946 		       info->fix.id, info->node);
2947 		primary_device = info->node;
2948 
2949 		for (i = first_fb_vc; i <= last_fb_vc; i++)
2950 			con2fb_map_boot[i] = primary_device;
2951 
2952 		if (con_is_bound(&fb_con)) {
2953 			printk(KERN_INFO "fbcon: Remapping primary device, "
2954 			       "fb%i, to tty %i-%i\n", info->node,
2955 			       first_fb_vc + 1, last_fb_vc + 1);
2956 			info_idx = primary_device;
2957 		}
2958 	}
2959 
2960 }
2961 #else
2962 static inline void fbcon_select_primary(struct fb_info *info)
2963 {
2964 	return;
2965 }
2966 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
2967 
2968 static bool lockless_register_fb;
2969 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
2970 MODULE_PARM_DESC(lockless_register_fb,
2971 	"Lockless framebuffer registration for debugging [default=off]");
2972 
2973 /* called with console_lock held */
2974 static int do_fb_registered(struct fb_info *info)
2975 {
2976 	int ret = 0, i, idx;
2977 
2978 	WARN_CONSOLE_UNLOCKED();
2979 
2980 	fbcon_registered_fb[info->node] = info;
2981 	fbcon_num_registered_fb++;
2982 
2983 	idx = info->node;
2984 	fbcon_select_primary(info);
2985 
2986 	if (deferred_takeover) {
2987 		pr_info("fbcon: Deferring console take-over\n");
2988 		return 0;
2989 	}
2990 
2991 	if (info_idx == -1) {
2992 		for (i = first_fb_vc; i <= last_fb_vc; i++) {
2993 			if (con2fb_map_boot[i] == idx) {
2994 				info_idx = idx;
2995 				break;
2996 			}
2997 		}
2998 
2999 		if (info_idx != -1)
3000 			ret = do_fbcon_takeover(1);
3001 	} else {
3002 		for (i = first_fb_vc; i <= last_fb_vc; i++) {
3003 			if (con2fb_map_boot[i] == idx)
3004 				set_con2fb_map(i, idx, 0);
3005 		}
3006 	}
3007 
3008 	return ret;
3009 }
3010 
3011 int fbcon_fb_registered(struct fb_info *info)
3012 {
3013 	int ret;
3014 
3015 	if (!lockless_register_fb)
3016 		console_lock();
3017 	else
3018 		atomic_inc(&ignore_console_lock_warning);
3019 
3020 	ret = do_fb_registered(info);
3021 
3022 	if (!lockless_register_fb)
3023 		console_unlock();
3024 	else
3025 		atomic_dec(&ignore_console_lock_warning);
3026 
3027 	return ret;
3028 }
3029 
3030 void fbcon_fb_blanked(struct fb_info *info, int blank)
3031 {
3032 	struct fbcon_ops *ops = info->fbcon_par;
3033 	struct vc_data *vc;
3034 
3035 	if (!ops || ops->currcon < 0)
3036 		return;
3037 
3038 	vc = vc_cons[ops->currcon].d;
3039 	if (vc->vc_mode != KD_TEXT ||
3040 			fbcon_info_from_console(ops->currcon) != info)
3041 		return;
3042 
3043 	if (con_is_visible(vc)) {
3044 		if (blank)
3045 			do_blank_screen(0);
3046 		else
3047 			do_unblank_screen(0);
3048 	}
3049 	ops->blank_state = blank;
3050 }
3051 
3052 void fbcon_new_modelist(struct fb_info *info)
3053 {
3054 	int i;
3055 	struct vc_data *vc;
3056 	struct fb_var_screeninfo var;
3057 	const struct fb_videomode *mode;
3058 
3059 	for (i = first_fb_vc; i <= last_fb_vc; i++) {
3060 		if (fbcon_info_from_console(i) != info)
3061 			continue;
3062 		if (!fb_display[i].mode)
3063 			continue;
3064 		vc = vc_cons[i].d;
3065 		display_to_var(&var, &fb_display[i]);
3066 		mode = fb_find_nearest_mode(fb_display[i].mode,
3067 					    &info->modelist);
3068 		fb_videomode_to_var(&var, mode);
3069 		fbcon_set_disp(info, &var, vc->vc_num);
3070 	}
3071 }
3072 
3073 void fbcon_get_requirement(struct fb_info *info,
3074 			   struct fb_blit_caps *caps)
3075 {
3076 	struct vc_data *vc;
3077 
3078 	if (caps->flags) {
3079 		int i, charcnt;
3080 
3081 		for (i = first_fb_vc; i <= last_fb_vc; i++) {
3082 			vc = vc_cons[i].d;
3083 			if (vc && vc->vc_mode == KD_TEXT &&
3084 			    info->node == con2fb_map[i]) {
3085 				caps->x |= 1 << (vc->vc_font.width - 1);
3086 				caps->y |= 1 << (vc->vc_font.height - 1);
3087 				charcnt = vc->vc_font.charcount;
3088 				if (caps->len < charcnt)
3089 					caps->len = charcnt;
3090 			}
3091 		}
3092 	} else {
3093 		vc = vc_cons[fg_console].d;
3094 
3095 		if (vc && vc->vc_mode == KD_TEXT &&
3096 		    info->node == con2fb_map[fg_console]) {
3097 			caps->x = 1 << (vc->vc_font.width - 1);
3098 			caps->y = 1 << (vc->vc_font.height - 1);
3099 			caps->len = vc->vc_font.charcount;
3100 		}
3101 	}
3102 }
3103 
3104 int fbcon_set_con2fb_map_ioctl(void __user *argp)
3105 {
3106 	struct fb_con2fbmap con2fb;
3107 	int ret;
3108 
3109 	if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
3110 		return -EFAULT;
3111 	if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
3112 		return -EINVAL;
3113 	if (con2fb.framebuffer >= FB_MAX)
3114 		return -EINVAL;
3115 	if (!fbcon_registered_fb[con2fb.framebuffer])
3116 		request_module("fb%d", con2fb.framebuffer);
3117 	if (!fbcon_registered_fb[con2fb.framebuffer]) {
3118 		return -EINVAL;
3119 	}
3120 
3121 	console_lock();
3122 	ret = set_con2fb_map(con2fb.console - 1,
3123 			     con2fb.framebuffer, 1);
3124 	console_unlock();
3125 
3126 	return ret;
3127 }
3128 
3129 int fbcon_get_con2fb_map_ioctl(void __user *argp)
3130 {
3131 	struct fb_con2fbmap con2fb;
3132 
3133 	if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
3134 		return -EFAULT;
3135 	if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
3136 		return -EINVAL;
3137 
3138 	console_lock();
3139 	con2fb.framebuffer = con2fb_map[con2fb.console - 1];
3140 	console_unlock();
3141 
3142 	return copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
3143 }
3144 
3145 /*
3146  *  The console `switch' structure for the frame buffer based console
3147  */
3148 
3149 static const struct consw fb_con = {
3150 	.owner			= THIS_MODULE,
3151 	.con_startup 		= fbcon_startup,
3152 	.con_init 		= fbcon_init,
3153 	.con_deinit 		= fbcon_deinit,
3154 	.con_clear 		= fbcon_clear,
3155 	.con_putc 		= fbcon_putc,
3156 	.con_putcs 		= fbcon_putcs,
3157 	.con_cursor 		= fbcon_cursor,
3158 	.con_scroll 		= fbcon_scroll,
3159 	.con_switch 		= fbcon_switch,
3160 	.con_blank 		= fbcon_blank,
3161 	.con_font_set 		= fbcon_set_font,
3162 	.con_font_get 		= fbcon_get_font,
3163 	.con_font_default	= fbcon_set_def_font,
3164 	.con_set_palette 	= fbcon_set_palette,
3165 	.con_invert_region 	= fbcon_invert_region,
3166 	.con_screen_pos 	= fbcon_screen_pos,
3167 	.con_getxy 		= fbcon_getxy,
3168 	.con_resize             = fbcon_resize,
3169 	.con_debug_enter	= fbcon_debug_enter,
3170 	.con_debug_leave	= fbcon_debug_leave,
3171 };
3172 
3173 static ssize_t store_rotate(struct device *device,
3174 			    struct device_attribute *attr, const char *buf,
3175 			    size_t count)
3176 {
3177 	struct fb_info *info;
3178 	int rotate, idx;
3179 	char **last = NULL;
3180 
3181 	console_lock();
3182 	idx = con2fb_map[fg_console];
3183 
3184 	if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3185 		goto err;
3186 
3187 	info = fbcon_registered_fb[idx];
3188 	rotate = simple_strtoul(buf, last, 0);
3189 	fbcon_rotate(info, rotate);
3190 err:
3191 	console_unlock();
3192 	return count;
3193 }
3194 
3195 static ssize_t store_rotate_all(struct device *device,
3196 				struct device_attribute *attr,const char *buf,
3197 				size_t count)
3198 {
3199 	struct fb_info *info;
3200 	int rotate, idx;
3201 	char **last = NULL;
3202 
3203 	console_lock();
3204 	idx = con2fb_map[fg_console];
3205 
3206 	if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3207 		goto err;
3208 
3209 	info = fbcon_registered_fb[idx];
3210 	rotate = simple_strtoul(buf, last, 0);
3211 	fbcon_rotate_all(info, rotate);
3212 err:
3213 	console_unlock();
3214 	return count;
3215 }
3216 
3217 static ssize_t show_rotate(struct device *device,
3218 			   struct device_attribute *attr,char *buf)
3219 {
3220 	struct fb_info *info;
3221 	int rotate = 0, idx;
3222 
3223 	console_lock();
3224 	idx = con2fb_map[fg_console];
3225 
3226 	if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3227 		goto err;
3228 
3229 	info = fbcon_registered_fb[idx];
3230 	rotate = fbcon_get_rotate(info);
3231 err:
3232 	console_unlock();
3233 	return sysfs_emit(buf, "%d\n", rotate);
3234 }
3235 
3236 static ssize_t show_cursor_blink(struct device *device,
3237 				 struct device_attribute *attr, char *buf)
3238 {
3239 	struct fb_info *info;
3240 	struct fbcon_ops *ops;
3241 	int idx, blink = -1;
3242 
3243 	console_lock();
3244 	idx = con2fb_map[fg_console];
3245 
3246 	if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3247 		goto err;
3248 
3249 	info = fbcon_registered_fb[idx];
3250 	ops = info->fbcon_par;
3251 
3252 	if (!ops)
3253 		goto err;
3254 
3255 	blink = delayed_work_pending(&ops->cursor_work);
3256 err:
3257 	console_unlock();
3258 	return sysfs_emit(buf, "%d\n", blink);
3259 }
3260 
3261 static ssize_t store_cursor_blink(struct device *device,
3262 				  struct device_attribute *attr,
3263 				  const char *buf, size_t count)
3264 {
3265 	struct fb_info *info;
3266 	int blink, idx;
3267 	char **last = NULL;
3268 
3269 	console_lock();
3270 	idx = con2fb_map[fg_console];
3271 
3272 	if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3273 		goto err;
3274 
3275 	info = fbcon_registered_fb[idx];
3276 
3277 	if (!info->fbcon_par)
3278 		goto err;
3279 
3280 	blink = simple_strtoul(buf, last, 0);
3281 
3282 	if (blink) {
3283 		fbcon_cursor_noblink = 0;
3284 		fbcon_add_cursor_work(info);
3285 	} else {
3286 		fbcon_cursor_noblink = 1;
3287 		fbcon_del_cursor_work(info);
3288 	}
3289 
3290 err:
3291 	console_unlock();
3292 	return count;
3293 }
3294 
3295 static struct device_attribute device_attrs[] = {
3296 	__ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
3297 	__ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
3298 	__ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
3299 	       store_cursor_blink),
3300 };
3301 
3302 static int fbcon_init_device(void)
3303 {
3304 	int i, error = 0;
3305 
3306 	fbcon_has_sysfs = 1;
3307 
3308 	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3309 		error = device_create_file(fbcon_device, &device_attrs[i]);
3310 
3311 		if (error)
3312 			break;
3313 	}
3314 
3315 	if (error) {
3316 		while (--i >= 0)
3317 			device_remove_file(fbcon_device, &device_attrs[i]);
3318 
3319 		fbcon_has_sysfs = 0;
3320 	}
3321 
3322 	return 0;
3323 }
3324 
3325 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3326 static void fbcon_register_existing_fbs(struct work_struct *work)
3327 {
3328 	int i;
3329 
3330 	console_lock();
3331 
3332 	deferred_takeover = false;
3333 	logo_shown = FBCON_LOGO_DONTSHOW;
3334 
3335 	fbcon_for_each_registered_fb(i)
3336 		do_fb_registered(fbcon_registered_fb[i]);
3337 
3338 	console_unlock();
3339 }
3340 
3341 static struct notifier_block fbcon_output_nb;
3342 static DECLARE_WORK(fbcon_deferred_takeover_work, fbcon_register_existing_fbs);
3343 
3344 static int fbcon_output_notifier(struct notifier_block *nb,
3345 				 unsigned long action, void *data)
3346 {
3347 	WARN_CONSOLE_UNLOCKED();
3348 
3349 	pr_info("fbcon: Taking over console\n");
3350 
3351 	dummycon_unregister_output_notifier(&fbcon_output_nb);
3352 
3353 	/* We may get called in atomic context */
3354 	schedule_work(&fbcon_deferred_takeover_work);
3355 
3356 	return NOTIFY_OK;
3357 }
3358 #endif
3359 
3360 static void fbcon_start(void)
3361 {
3362 	WARN_CONSOLE_UNLOCKED();
3363 
3364 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3365 	if (conswitchp != &dummy_con)
3366 		deferred_takeover = false;
3367 
3368 	if (deferred_takeover) {
3369 		fbcon_output_nb.notifier_call = fbcon_output_notifier;
3370 		dummycon_register_output_notifier(&fbcon_output_nb);
3371 		return;
3372 	}
3373 #endif
3374 }
3375 
3376 void __init fb_console_init(void)
3377 {
3378 	int i;
3379 
3380 	console_lock();
3381 	fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
3382 				     "fbcon");
3383 
3384 	if (IS_ERR(fbcon_device)) {
3385 		printk(KERN_WARNING "Unable to create device "
3386 		       "for fbcon; errno = %ld\n",
3387 		       PTR_ERR(fbcon_device));
3388 		fbcon_device = NULL;
3389 	} else
3390 		fbcon_init_device();
3391 
3392 	for (i = 0; i < MAX_NR_CONSOLES; i++)
3393 		con2fb_map[i] = -1;
3394 
3395 	fbcon_start();
3396 	console_unlock();
3397 }
3398 
3399 #ifdef MODULE
3400 
3401 static void __exit fbcon_deinit_device(void)
3402 {
3403 	int i;
3404 
3405 	if (fbcon_has_sysfs) {
3406 		for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3407 			device_remove_file(fbcon_device, &device_attrs[i]);
3408 
3409 		fbcon_has_sysfs = 0;
3410 	}
3411 }
3412 
3413 void __exit fb_console_exit(void)
3414 {
3415 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3416 	console_lock();
3417 	if (deferred_takeover)
3418 		dummycon_unregister_output_notifier(&fbcon_output_nb);
3419 	console_unlock();
3420 
3421 	cancel_work_sync(&fbcon_deferred_takeover_work);
3422 #endif
3423 
3424 	console_lock();
3425 	fbcon_deinit_device();
3426 	device_destroy(fb_class, MKDEV(0, 0));
3427 
3428 	do_unregister_con_driver(&fb_con);
3429 	console_unlock();
3430 }
3431 #endif
3432