Pull trivial1 into release branch
[linux-2.6] / drivers / video / console / fbcon.c
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 #undef FBCONDEBUG
60
61 #include <linux/config.h>
62 #include <linux/module.h>
63 #include <linux/types.h>
64 #include <linux/sched.h>
65 #include <linux/fs.h>
66 #include <linux/kernel.h>
67 #include <linux/delay.h>        /* MSch: for IRQ probe */
68 #include <linux/tty.h>
69 #include <linux/console.h>
70 #include <linux/string.h>
71 #include <linux/kd.h>
72 #include <linux/slab.h>
73 #include <linux/fb.h>
74 #include <linux/vt_kern.h>
75 #include <linux/selection.h>
76 #include <linux/font.h>
77 #include <linux/smp.h>
78 #include <linux/init.h>
79 #include <linux/interrupt.h>
80 #include <linux/crc32.h> /* For counting font checksums */
81 #include <asm/irq.h>
82 #include <asm/system.h>
83 #include <asm/uaccess.h>
84 #ifdef CONFIG_ATARI
85 #include <asm/atariints.h>
86 #endif
87 #ifdef CONFIG_MAC
88 #include <asm/macints.h>
89 #endif
90 #if defined(__mc68000__) || defined(CONFIG_APUS)
91 #include <asm/machdep.h>
92 #include <asm/setup.h>
93 #endif
94
95 #include "fbcon.h"
96
97 #ifdef FBCONDEBUG
98 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
99 #else
100 #  define DPRINTK(fmt, args...)
101 #endif
102
103 enum {
104         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
105         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
106         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
107 };
108
109 static struct display fb_display[MAX_NR_CONSOLES];
110
111 static signed char con2fb_map[MAX_NR_CONSOLES];
112 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
113 static int logo_height;
114 static int logo_lines;
115 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
116    enums.  */
117 static int logo_shown = FBCON_LOGO_CANSHOW;
118 /* Software scrollback */
119 static int fbcon_softback_size = 32768;
120 static unsigned long softback_buf, softback_curr;
121 static unsigned long softback_in;
122 static unsigned long softback_top, softback_end;
123 static int softback_lines;
124 /* console mappings */
125 static int first_fb_vc;
126 static int last_fb_vc = MAX_NR_CONSOLES - 1;
127 static int fbcon_is_default = 1; 
128 /* font data */
129 static char fontname[40];
130
131 /* current fb_info */
132 static int info_idx = -1;
133
134 /* console rotation */
135 static int rotate;
136
137 static const struct consw fb_con;
138
139 #define CM_SOFTBACK     (8)
140
141 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
142
143 static void fbcon_free_font(struct display *);
144 static int fbcon_set_origin(struct vc_data *);
145
146 #define CURSOR_DRAW_DELAY               (1)
147
148 /* # VBL ints between cursor state changes */
149 #define ATARI_CURSOR_BLINK_RATE         (42)
150 #define MAC_CURSOR_BLINK_RATE           (32)
151 #define DEFAULT_CURSOR_BLINK_RATE       (20)
152
153 static int vbl_cursor_cnt;
154
155 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
156
157 /*
158  *  Interface used by the world
159  */
160
161 static const char *fbcon_startup(void);
162 static void fbcon_init(struct vc_data *vc, int init);
163 static void fbcon_deinit(struct vc_data *vc);
164 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
165                         int width);
166 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
167 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
168                         int count, int ypos, int xpos);
169 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
170 static void fbcon_cursor(struct vc_data *vc, int mode);
171 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
172                         int count);
173 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
174                         int height, int width);
175 static int fbcon_switch(struct vc_data *vc);
176 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
177 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
178 static int fbcon_scrolldelta(struct vc_data *vc, int lines);
179
180 /*
181  *  Internal routines
182  */
183 static __inline__ void ywrap_up(struct vc_data *vc, int count);
184 static __inline__ void ywrap_down(struct vc_data *vc, int count);
185 static __inline__ void ypan_up(struct vc_data *vc, int count);
186 static __inline__ void ypan_down(struct vc_data *vc, int count);
187 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
188                             int dy, int dx, int height, int width, u_int y_break);
189 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
190                            struct vc_data *vc);
191 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
192                               int unit);
193 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
194                               int line, int count, int dy);
195 static void fbcon_modechanged(struct fb_info *info);
196 static void fbcon_set_all_vcs(struct fb_info *info);
197
198 #ifdef CONFIG_MAC
199 /*
200  * On the Macintoy, there may or may not be a working VBL int. We need to probe
201  */
202 static int vbl_detected;
203
204 static irqreturn_t fb_vbl_detect(int irq, void *dummy, struct pt_regs *fp)
205 {
206         vbl_detected++;
207         return IRQ_HANDLED;
208 }
209 #endif
210
211 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
212 static inline void fbcon_set_rotation(struct fb_info *info)
213 {
214         struct fbcon_ops *ops = info->fbcon_par;
215
216         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
217             ops->p->con_rotate < 4)
218                 ops->rotate = ops->p->con_rotate;
219         else
220                 ops->rotate = 0;
221 }
222
223 static void fbcon_rotate(struct fb_info *info, u32 rotate)
224 {
225         struct fbcon_ops *ops= info->fbcon_par;
226         struct fb_info *fb_info;
227
228         if (!ops || ops->currcon == -1)
229                 return;
230
231         fb_info = registered_fb[con2fb_map[ops->currcon]];
232
233         if (info == fb_info) {
234                 struct display *p = &fb_display[ops->currcon];
235
236                 if (rotate < 4)
237                         p->con_rotate = rotate;
238                 else
239                         p->con_rotate = 0;
240
241                 fbcon_modechanged(info);
242         }
243 }
244
245 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
246 {
247         struct fbcon_ops *ops = info->fbcon_par;
248         struct vc_data *vc;
249         struct display *p;
250         int i;
251
252         if (!ops || ops->currcon < 0 || rotate > 3)
253                 return;
254
255         for (i = 0; i < MAX_NR_CONSOLES; i++) {
256                 vc = vc_cons[i].d;
257                 if (!vc || vc->vc_mode != KD_TEXT ||
258                     registered_fb[con2fb_map[i]] != info)
259                         continue;
260
261                 p = &fb_display[vc->vc_num];
262                 p->con_rotate = rotate;
263         }
264
265         fbcon_set_all_vcs(info);
266 }
267 #else
268 static inline void fbcon_set_rotation(struct fb_info *info)
269 {
270         struct fbcon_ops *ops = info->fbcon_par;
271
272         ops->rotate = FB_ROTATE_UR;
273 }
274
275 static void fbcon_rotate(struct fb_info *info, u32 rotate)
276 {
277         return;
278 }
279
280 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
281 {
282         return;
283 }
284 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
285
286 static int fbcon_get_rotate(struct fb_info *info)
287 {
288         struct fbcon_ops *ops = info->fbcon_par;
289
290         return (ops) ? ops->rotate : 0;
291 }
292
293 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
294 {
295         struct fbcon_ops *ops = info->fbcon_par;
296
297         return (info->state != FBINFO_STATE_RUNNING ||
298                 vc->vc_mode != KD_TEXT || ops->graphics);
299 }
300
301 static inline int get_color(struct vc_data *vc, struct fb_info *info,
302               u16 c, int is_fg)
303 {
304         int depth = fb_get_color_depth(&info->var, &info->fix);
305         int color = 0;
306
307         if (console_blanked) {
308                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
309
310                 c = vc->vc_video_erase_char & charmask;
311         }
312
313         if (depth != 1)
314                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
315                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
316
317         switch (depth) {
318         case 1:
319         {
320                 int col = ~(0xfff << (max(info->var.green.length,
321                                           max(info->var.red.length,
322                                               info->var.blue.length)))) & 0xff;
323
324                 /* 0 or 1 */
325                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
326                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
327
328                 if (console_blanked)
329                         fg = bg;
330
331                 color = (is_fg) ? fg : bg;
332                 break;
333         }
334         case 2:
335                 /*
336                  * Scale down 16-colors to 4 colors. Default 4-color palette
337                  * is grayscale. However, simply dividing the values by 4
338                  * will not work, as colors 1, 2 and 3 will be scaled-down
339                  * to zero rendering them invisible.  So empirically convert
340                  * colors to a sane 4-level grayscale.
341                  */
342                 switch (color) {
343                 case 0:
344                         color = 0; /* black */
345                         break;
346                 case 1 ... 6:
347                         color = 2; /* white */
348                         break;
349                 case 7 ... 8:
350                         color = 1; /* gray */
351                         break;
352                 default:
353                         color = 3; /* intense white */
354                         break;
355                 }
356                 break;
357         case 3:
358                 /*
359                  * Last 8 entries of default 16-color palette is a more intense
360                  * version of the first 8 (i.e., same chrominance, different
361                  * luminance).
362                  */
363                 color &= 7;
364                 break;
365         }
366
367
368         return color;
369 }
370
371 static void fbcon_update_softback(struct vc_data *vc)
372 {
373         int l = fbcon_softback_size / vc->vc_size_row;
374
375         if (l > 5)
376                 softback_end = softback_buf + l * vc->vc_size_row;
377         else
378                 /* Smaller scrollback makes no sense, and 0 would screw
379                    the operation totally */
380                 softback_top = 0;
381 }
382
383 static void fb_flashcursor(void *private)
384 {
385         struct fb_info *info = private;
386         struct fbcon_ops *ops = info->fbcon_par;
387         struct display *p;
388         struct vc_data *vc = NULL;
389         int c;
390         int mode;
391
392         if (ops->currcon != -1)
393                 vc = vc_cons[ops->currcon].d;
394
395         if (!vc || !CON_IS_VISIBLE(vc) ||
396             fbcon_is_inactive(vc, info) ||
397             registered_fb[con2fb_map[vc->vc_num]] != info ||
398             vc_cons[ops->currcon].d->vc_deccm != 1)
399                 return;
400         acquire_console_sem();
401         p = &fb_display[vc->vc_num];
402         c = scr_readw((u16 *) vc->vc_pos);
403         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
404                 CM_ERASE : CM_DRAW;
405         ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
406                     get_color(vc, info, c, 0));
407         release_console_sem();
408 }
409
410 #if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
411 static int cursor_blink_rate;
412 static irqreturn_t fb_vbl_handler(int irq, void *dev_id, struct pt_regs *fp)
413 {
414         struct fb_info *info = dev_id;
415
416         if (vbl_cursor_cnt && --vbl_cursor_cnt == 0) {
417                 schedule_work(&info->queue);    
418                 vbl_cursor_cnt = cursor_blink_rate; 
419         }
420         return IRQ_HANDLED;
421 }
422 #endif
423         
424 static void cursor_timer_handler(unsigned long dev_addr)
425 {
426         struct fb_info *info = (struct fb_info *) dev_addr;
427         struct fbcon_ops *ops = info->fbcon_par;
428
429         schedule_work(&info->queue);
430         mod_timer(&ops->cursor_timer, jiffies + HZ/5);
431 }
432
433 static void fbcon_add_cursor_timer(struct fb_info *info)
434 {
435         struct fbcon_ops *ops = info->fbcon_par;
436
437         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
438             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER)) {
439                 if (!info->queue.func)
440                         INIT_WORK(&info->queue, fb_flashcursor, info);
441
442                 init_timer(&ops->cursor_timer);
443                 ops->cursor_timer.function = cursor_timer_handler;
444                 ops->cursor_timer.expires = jiffies + HZ / 5;
445                 ops->cursor_timer.data = (unsigned long ) info;
446                 add_timer(&ops->cursor_timer);
447                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
448         }
449 }
450
451 static void fbcon_del_cursor_timer(struct fb_info *info)
452 {
453         struct fbcon_ops *ops = info->fbcon_par;
454
455         if (info->queue.func == fb_flashcursor &&
456             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
457                 del_timer_sync(&ops->cursor_timer);
458                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
459         }
460 }
461
462 #ifndef MODULE
463 static int __init fb_console_setup(char *this_opt)
464 {
465         char *options;
466         int i, j;
467
468         if (!this_opt || !*this_opt)
469                 return 1;
470
471         while ((options = strsep(&this_opt, ",")) != NULL) {
472                 if (!strncmp(options, "font:", 5))
473                         strcpy(fontname, options + 5);
474                 
475                 if (!strncmp(options, "scrollback:", 11)) {
476                         options += 11;
477                         if (*options) {
478                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
479                                 if (*options == 'k' || *options == 'K') {
480                                         fbcon_softback_size *= 1024;
481                                         options++;
482                                 }
483                                 if (*options != ',')
484                                         return 1;
485                                 options++;
486                         } else
487                                 return 1;
488                 }
489                 
490                 if (!strncmp(options, "map:", 4)) {
491                         options += 4;
492                         if (*options)
493                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
494                                         if (!options[j])
495                                                 j = 0;
496                                         con2fb_map_boot[i] =
497                                                 (options[j++]-'0') % FB_MAX;
498                                 }
499                         return 1;
500                 }
501
502                 if (!strncmp(options, "vc:", 3)) {
503                         options += 3;
504                         if (*options)
505                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
506                         if (first_fb_vc < 0)
507                                 first_fb_vc = 0;
508                         if (*options++ == '-')
509                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
510                         fbcon_is_default = 0; 
511                 }       
512
513                 if (!strncmp(options, "rotate:", 7)) {
514                         options += 7;
515                         if (*options)
516                                 rotate = simple_strtoul(options, &options, 0);
517                         if (rotate > 3)
518                                 rotate = 0;
519                 }
520         }
521         return 1;
522 }
523
524 __setup("fbcon=", fb_console_setup);
525 #endif
526
527 static int search_fb_in_map(int idx)
528 {
529         int i, retval = 0;
530
531         for (i = 0; i < MAX_NR_CONSOLES; i++) {
532                 if (con2fb_map[i] == idx)
533                         retval = 1;
534         }
535         return retval;
536 }
537
538 static int search_for_mapped_con(void)
539 {
540         int i, retval = 0;
541
542         for (i = 0; i < MAX_NR_CONSOLES; i++) {
543                 if (con2fb_map[i] != -1)
544                         retval = 1;
545         }
546         return retval;
547 }
548
549 static int fbcon_takeover(int show_logo)
550 {
551         int err, i;
552
553         if (!num_registered_fb)
554                 return -ENODEV;
555
556         if (!show_logo)
557                 logo_shown = FBCON_LOGO_DONTSHOW;
558
559         for (i = first_fb_vc; i <= last_fb_vc; i++)
560                 con2fb_map[i] = info_idx;
561
562         err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
563                                 fbcon_is_default);
564         if (err) {
565                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
566                         con2fb_map[i] = -1;
567                 }
568                 info_idx = -1;
569         }
570
571         return err;
572 }
573
574 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
575                                int cols, int rows, int new_cols, int new_rows)
576 {
577         /* Need to make room for the logo */
578         struct fbcon_ops *ops = info->fbcon_par;
579         int cnt, erase = vc->vc_video_erase_char, step;
580         unsigned short *save = NULL, *r, *q;
581
582         /*
583          * remove underline attribute from erase character
584          * if black and white framebuffer.
585          */
586         if (fb_get_color_depth(&info->var, &info->fix) == 1)
587                 erase &= ~0x400;
588         logo_height = fb_prepare_logo(info, ops->rotate);
589         logo_lines = (logo_height + vc->vc_font.height - 1) /
590                 vc->vc_font.height;
591         q = (unsigned short *) (vc->vc_origin +
592                                 vc->vc_size_row * rows);
593         step = logo_lines * cols;
594         for (r = q - logo_lines * cols; r < q; r++)
595                 if (scr_readw(r) != vc->vc_video_erase_char)
596                         break;
597         if (r != q && new_rows >= rows + logo_lines) {
598                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
599                 if (save) {
600                         int i = cols < new_cols ? cols : new_cols;
601                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
602                         r = q - step;
603                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
604                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
605                         r = q;
606                 }
607         }
608         if (r == q) {
609                 /* We can scroll screen down */
610                 r = q - step - cols;
611                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
612                         scr_memcpyw(r + step, r, vc->vc_size_row);
613                         r -= cols;
614                 }
615                 if (!save) {
616                         vc->vc_y += logo_lines;
617                         vc->vc_pos += logo_lines * vc->vc_size_row;
618                 }
619         }
620         scr_memsetw((unsigned short *) vc->vc_origin,
621                     erase,
622                     vc->vc_size_row * logo_lines);
623
624         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
625                 fbcon_clear_margins(vc, 0);
626                 update_screen(vc);
627         }
628
629         if (save) {
630                 q = (unsigned short *) (vc->vc_origin +
631                                         vc->vc_size_row *
632                                         rows);
633                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
634                 vc->vc_y += logo_lines;
635                 vc->vc_pos += logo_lines * vc->vc_size_row;
636                 kfree(save);
637         }
638
639         if (logo_lines > vc->vc_bottom) {
640                 logo_shown = FBCON_LOGO_CANSHOW;
641                 printk(KERN_INFO
642                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
643         } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
644                 logo_shown = FBCON_LOGO_DRAW;
645                 vc->vc_top = logo_lines;
646         }
647 }
648
649 #ifdef CONFIG_FB_TILEBLITTING
650 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
651 {
652         struct fbcon_ops *ops = info->fbcon_par;
653
654         ops->p = &fb_display[vc->vc_num];
655
656         if ((info->flags & FBINFO_MISC_TILEBLITTING))
657                 fbcon_set_tileops(vc, info);
658         else {
659                 fbcon_set_rotation(info);
660                 fbcon_set_bitops(ops);
661         }
662 }
663 #else
664 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
665 {
666         struct fbcon_ops *ops = info->fbcon_par;
667
668         info->flags &= ~FBINFO_MISC_TILEBLITTING;
669         ops->p = &fb_display[vc->vc_num];
670         fbcon_set_rotation(info);
671         fbcon_set_bitops(ops);
672 }
673 #endif /* CONFIG_MISC_TILEBLITTING */
674
675
676 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
677                                   int unit, int oldidx)
678 {
679         struct fbcon_ops *ops = NULL;
680         int err = 0;
681
682         if (!try_module_get(info->fbops->owner))
683                 err = -ENODEV;
684
685         if (!err && info->fbops->fb_open &&
686             info->fbops->fb_open(info, 0))
687                 err = -ENODEV;
688
689         if (!err) {
690                 ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
691                 if (!ops)
692                         err = -ENOMEM;
693         }
694
695         if (!err) {
696                 info->fbcon_par = ops;
697                 set_blitting_type(vc, info);
698         }
699
700         if (err) {
701                 con2fb_map[unit] = oldidx;
702                 module_put(info->fbops->owner);
703         }
704
705         return err;
706 }
707
708 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
709                                   struct fb_info *newinfo, int unit,
710                                   int oldidx, int found)
711 {
712         struct fbcon_ops *ops = oldinfo->fbcon_par;
713         int err = 0;
714
715         if (oldinfo->fbops->fb_release &&
716             oldinfo->fbops->fb_release(oldinfo, 0)) {
717                 con2fb_map[unit] = oldidx;
718                 if (!found && newinfo->fbops->fb_release)
719                         newinfo->fbops->fb_release(newinfo, 0);
720                 if (!found)
721                         module_put(newinfo->fbops->owner);
722                 err = -ENODEV;
723         }
724
725         if (!err) {
726                 fbcon_del_cursor_timer(oldinfo);
727                 kfree(ops->cursor_state.mask);
728                 kfree(ops->cursor_data);
729                 kfree(ops->fontbuffer);
730                 kfree(oldinfo->fbcon_par);
731                 oldinfo->fbcon_par = NULL;
732                 module_put(oldinfo->fbops->owner);
733                 /*
734                   If oldinfo and newinfo are driving the same hardware,
735                   the fb_release() method of oldinfo may attempt to
736                   restore the hardware state.  This will leave the
737                   newinfo in an undefined state. Thus, a call to
738                   fb_set_par() may be needed for the newinfo.
739                 */
740                 if (newinfo->fbops->fb_set_par)
741                         newinfo->fbops->fb_set_par(newinfo);
742         }
743
744         return err;
745 }
746
747 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
748                                 int unit, int show_logo)
749 {
750         struct fbcon_ops *ops = info->fbcon_par;
751
752         ops->currcon = fg_console;
753
754         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT))
755                 info->fbops->fb_set_par(info);
756
757         ops->flags |= FBCON_FLAGS_INIT;
758         ops->graphics = 0;
759
760         if (vc)
761                 fbcon_set_disp(info, &info->var, vc);
762         else
763                 fbcon_preset_disp(info, &info->var, unit);
764
765         if (show_logo) {
766                 struct vc_data *fg_vc = vc_cons[fg_console].d;
767                 struct fb_info *fg_info =
768                         registered_fb[con2fb_map[fg_console]];
769
770                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
771                                    fg_vc->vc_rows, fg_vc->vc_cols,
772                                    fg_vc->vc_rows);
773         }
774
775         update_screen(vc_cons[fg_console].d);
776 }
777
778 /**
779  *      set_con2fb_map - map console to frame buffer device
780  *      @unit: virtual console number to map
781  *      @newidx: frame buffer index to map virtual console to
782  *      @user: user request
783  *
784  *      Maps a virtual console @unit to a frame buffer device
785  *      @newidx.
786  */
787 static int set_con2fb_map(int unit, int newidx, int user)
788 {
789         struct vc_data *vc = vc_cons[unit].d;
790         int oldidx = con2fb_map[unit];
791         struct fb_info *info = registered_fb[newidx];
792         struct fb_info *oldinfo = NULL;
793         int found, err = 0;
794
795         if (oldidx == newidx)
796                 return 0;
797
798         if (!info)
799                 err =  -EINVAL;
800
801         if (!err && !search_for_mapped_con()) {
802                 info_idx = newidx;
803                 return fbcon_takeover(0);
804         }
805
806         if (oldidx != -1)
807                 oldinfo = registered_fb[oldidx];
808
809         found = search_fb_in_map(newidx);
810
811         acquire_console_sem();
812         con2fb_map[unit] = newidx;
813         if (!err && !found)
814                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
815
816
817         /*
818          * If old fb is not mapped to any of the consoles,
819          * fbcon should release it.
820          */
821         if (!err && oldinfo && !search_fb_in_map(oldidx))
822                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
823                                              found);
824
825         if (!err) {
826                 int show_logo = (fg_console == 0 && !user &&
827                                  logo_shown != FBCON_LOGO_DONTSHOW);
828
829                 if (!found)
830                         fbcon_add_cursor_timer(info);
831                 con2fb_map_boot[unit] = newidx;
832                 con2fb_init_display(vc, info, unit, show_logo);
833         }
834
835         release_console_sem();
836         return err;
837 }
838
839 /*
840  *  Low Level Operations
841  */
842 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
843 static int var_to_display(struct display *disp,
844                           struct fb_var_screeninfo *var,
845                           struct fb_info *info)
846 {
847         disp->xres_virtual = var->xres_virtual;
848         disp->yres_virtual = var->yres_virtual;
849         disp->bits_per_pixel = var->bits_per_pixel;
850         disp->grayscale = var->grayscale;
851         disp->nonstd = var->nonstd;
852         disp->accel_flags = var->accel_flags;
853         disp->height = var->height;
854         disp->width = var->width;
855         disp->red = var->red;
856         disp->green = var->green;
857         disp->blue = var->blue;
858         disp->transp = var->transp;
859         disp->rotate = var->rotate;
860         disp->mode = fb_match_mode(var, &info->modelist);
861         if (disp->mode == NULL)
862                 /* This should not happen */
863                 return -EINVAL;
864         return 0;
865 }
866
867 static void display_to_var(struct fb_var_screeninfo *var,
868                            struct display *disp)
869 {
870         fb_videomode_to_var(var, disp->mode);
871         var->xres_virtual = disp->xres_virtual;
872         var->yres_virtual = disp->yres_virtual;
873         var->bits_per_pixel = disp->bits_per_pixel;
874         var->grayscale = disp->grayscale;
875         var->nonstd = disp->nonstd;
876         var->accel_flags = disp->accel_flags;
877         var->height = disp->height;
878         var->width = disp->width;
879         var->red = disp->red;
880         var->green = disp->green;
881         var->blue = disp->blue;
882         var->transp = disp->transp;
883         var->rotate = disp->rotate;
884 }
885
886 static const char *fbcon_startup(void)
887 {
888         const char *display_desc = "frame buffer device";
889         struct display *p = &fb_display[fg_console];
890         struct vc_data *vc = vc_cons[fg_console].d;
891         const struct font_desc *font = NULL;
892         struct module *owner;
893         struct fb_info *info = NULL;
894         struct fbcon_ops *ops;
895         int rows, cols;
896         int irqres;
897
898         irqres = 1;
899         /*
900          *  If num_registered_fb is zero, this is a call for the dummy part.
901          *  The frame buffer devices weren't initialized yet.
902          */
903         if (!num_registered_fb || info_idx == -1)
904                 return display_desc;
905         /*
906          * Instead of blindly using registered_fb[0], we use info_idx, set by
907          * fb_console_init();
908          */
909         info = registered_fb[info_idx];
910         if (!info)
911                 return NULL;
912         
913         owner = info->fbops->owner;
914         if (!try_module_get(owner))
915                 return NULL;
916         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
917                 module_put(owner);
918                 return NULL;
919         }
920
921         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
922         if (!ops) {
923                 module_put(owner);
924                 return NULL;
925         }
926
927         ops->currcon = -1;
928         ops->graphics = 1;
929         ops->cur_rotate = -1;
930         info->fbcon_par = ops;
931         p->con_rotate = rotate;
932         set_blitting_type(vc, info);
933
934         if (info->fix.type != FB_TYPE_TEXT) {
935                 if (fbcon_softback_size) {
936                         if (!softback_buf) {
937                                 softback_buf =
938                                     (unsigned long)
939                                     kmalloc(fbcon_softback_size,
940                                             GFP_KERNEL);
941                                 if (!softback_buf) {
942                                         fbcon_softback_size = 0;
943                                         softback_top = 0;
944                                 }
945                         }
946                 } else {
947                         if (softback_buf) {
948                                 kfree((void *) softback_buf);
949                                 softback_buf = 0;
950                                 softback_top = 0;
951                         }
952                 }
953                 if (softback_buf)
954                         softback_in = softback_top = softback_curr =
955                             softback_buf;
956                 softback_lines = 0;
957         }
958
959         /* Setup default font */
960         if (!p->fontdata) {
961                 if (!fontname[0] || !(font = find_font(fontname)))
962                         font = get_default_font(info->var.xres,
963                                                 info->var.yres);
964                 vc->vc_font.width = font->width;
965                 vc->vc_font.height = font->height;
966                 vc->vc_font.data = (void *)(p->fontdata = font->data);
967                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
968         }
969
970         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
971         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
972         cols /= vc->vc_font.width;
973         rows /= vc->vc_font.height;
974         vc_resize(vc, cols, rows);
975
976         DPRINTK("mode:   %s\n", info->fix.id);
977         DPRINTK("visual: %d\n", info->fix.visual);
978         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
979                 info->var.yres,
980                 info->var.bits_per_pixel);
981
982 #ifdef CONFIG_ATARI
983         if (MACH_IS_ATARI) {
984                 cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
985                 irqres =
986                     request_irq(IRQ_AUTO_4, fb_vbl_handler,
987                                 IRQ_TYPE_PRIO, "framebuffer vbl",
988                                 info);
989         }
990 #endif                          /* CONFIG_ATARI */
991
992 #ifdef CONFIG_MAC
993         /*
994          * On a Macintoy, the VBL interrupt may or may not be active. 
995          * As interrupt based cursor is more reliable and race free, we 
996          * probe for VBL interrupts.
997          */
998         if (MACH_IS_MAC) {
999                 int ct = 0;
1000                 /*
1001                  * Probe for VBL: set temp. handler ...
1002                  */
1003                 irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
1004                                      "framebuffer vbl", info);
1005                 vbl_detected = 0;
1006
1007                 /*
1008                  * ... and spin for 20 ms ...
1009                  */
1010                 while (!vbl_detected && ++ct < 1000)
1011                         udelay(20);
1012
1013                 if (ct == 1000)
1014                         printk
1015                             ("fbcon_startup: No VBL detected, using timer based cursor.\n");
1016
1017                 free_irq(IRQ_MAC_VBL, fb_vbl_detect);
1018
1019                 if (vbl_detected) {
1020                         /*
1021                          * interrupt based cursor ok
1022                          */
1023                         cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
1024                         irqres =
1025                             request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
1026                                         "framebuffer vbl", info);
1027                 } else {
1028                         /*
1029                          * VBL not detected: fall through, use timer based cursor
1030                          */
1031                         irqres = 1;
1032                 }
1033         }
1034 #endif                          /* CONFIG_MAC */
1035
1036         fbcon_add_cursor_timer(info);
1037         return display_desc;
1038 }
1039
1040 static void fbcon_init(struct vc_data *vc, int init)
1041 {
1042         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1043         struct fbcon_ops *ops;
1044         struct vc_data **default_mode = vc->vc_display_fg;
1045         struct vc_data *svc = *default_mode;
1046         struct display *t, *p = &fb_display[vc->vc_num];
1047         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1048         int cap;
1049
1050         if (info_idx == -1 || info == NULL)
1051             return;
1052
1053         cap = info->flags;
1054
1055         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1056             (info->fix.type == FB_TYPE_TEXT))
1057                 logo = 0;
1058
1059         if (var_to_display(p, &info->var, info))
1060                 return;
1061
1062         /* If we are not the first console on this
1063            fb, copy the font from that console */
1064         t = &fb_display[svc->vc_num];
1065         if (!vc->vc_font.data) {
1066                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1067                 vc->vc_font.width = (*default_mode)->vc_font.width;
1068                 vc->vc_font.height = (*default_mode)->vc_font.height;
1069                 p->userfont = t->userfont;
1070                 if (p->userfont)
1071                         REFCOUNT(p->fontdata)++;
1072         }
1073         if (p->userfont)
1074                 charcnt = FNTCHARCNT(p->fontdata);
1075         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1076         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1077         if (charcnt == 256) {
1078                 vc->vc_hi_font_mask = 0;
1079         } else {
1080                 vc->vc_hi_font_mask = 0x100;
1081                 if (vc->vc_can_do_color)
1082                         vc->vc_complement_mask <<= 1;
1083         }
1084
1085         if (!*svc->vc_uni_pagedir_loc)
1086                 con_set_default_unimap(svc);
1087         if (!*vc->vc_uni_pagedir_loc)
1088                 con_copy_unimap(vc, svc);
1089
1090         ops = info->fbcon_par;
1091         p->con_rotate = rotate;
1092         set_blitting_type(vc, info);
1093
1094         cols = vc->vc_cols;
1095         rows = vc->vc_rows;
1096         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1097         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1098         new_cols /= vc->vc_font.width;
1099         new_rows /= vc->vc_font.height;
1100         vc_resize(vc, new_cols, new_rows);
1101
1102         /*
1103          * We must always set the mode. The mode of the previous console
1104          * driver could be in the same resolution but we are using different
1105          * hardware so we have to initialize the hardware.
1106          *
1107          * We need to do it in fbcon_init() to prevent screen corruption.
1108          */
1109         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
1110                 if (info->fbops->fb_set_par &&
1111                     !(ops->flags & FBCON_FLAGS_INIT))
1112                         info->fbops->fb_set_par(info);
1113                 ops->flags |= FBCON_FLAGS_INIT;
1114         }
1115
1116         ops->graphics = 0;
1117
1118         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1119             !(cap & FBINFO_HWACCEL_DISABLED))
1120                 p->scrollmode = SCROLL_MOVE;
1121         else /* default to something safe */
1122                 p->scrollmode = SCROLL_REDRAW;
1123
1124         /*
1125          *  ++guenther: console.c:vc_allocate() relies on initializing
1126          *  vc_{cols,rows}, but we must not set those if we are only
1127          *  resizing the console.
1128          */
1129         if (!init) {
1130                 vc->vc_cols = new_cols;
1131                 vc->vc_rows = new_rows;
1132         }
1133
1134         if (logo)
1135                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1136
1137         if (vc == svc && softback_buf)
1138                 fbcon_update_softback(vc);
1139
1140         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1141                 ops->rotate = FB_ROTATE_UR;
1142                 set_blitting_type(vc, info);
1143         }
1144
1145         ops->p = &fb_display[fg_console];
1146 }
1147
1148 static void fbcon_deinit(struct vc_data *vc)
1149 {
1150         struct display *p = &fb_display[vc->vc_num];
1151
1152         if (info_idx != -1)
1153             return;
1154         fbcon_free_font(p);
1155 }
1156
1157 /* ====================================================================== */
1158
1159 /*  fbcon_XXX routines - interface used by the world
1160  *
1161  *  This system is now divided into two levels because of complications
1162  *  caused by hardware scrolling. Top level functions:
1163  *
1164  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1165  *
1166  *  handles y values in range [0, scr_height-1] that correspond to real
1167  *  screen positions. y_wrap shift means that first line of bitmap may be
1168  *  anywhere on this display. These functions convert lineoffsets to
1169  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1170  *
1171  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1172  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1173  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1174  *
1175  *  WARNING:
1176  *
1177  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1178  *  Implies should only really hardware scroll in rows. Only reason for
1179  *  restriction is simplicity & efficiency at the moment.
1180  */
1181
1182 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1183                         int width)
1184 {
1185         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1186         struct fbcon_ops *ops = info->fbcon_par;
1187
1188         struct display *p = &fb_display[vc->vc_num];
1189         u_int y_break;
1190
1191         if (fbcon_is_inactive(vc, info))
1192                 return;
1193
1194         if (!height || !width)
1195                 return;
1196
1197         /* Split blits that cross physical y_wrap boundary */
1198
1199         y_break = p->vrows - p->yscroll;
1200         if (sy < y_break && sy + height - 1 >= y_break) {
1201                 u_int b = y_break - sy;
1202                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1203                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1204                                  width);
1205         } else
1206                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1207 }
1208
1209 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1210                         int count, int ypos, int xpos)
1211 {
1212         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1213         struct display *p = &fb_display[vc->vc_num];
1214         struct fbcon_ops *ops = info->fbcon_par;
1215
1216         if (!fbcon_is_inactive(vc, info))
1217                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1218                            get_color(vc, info, scr_readw(s), 1),
1219                            get_color(vc, info, scr_readw(s), 0));
1220 }
1221
1222 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1223 {
1224         unsigned short chr;
1225
1226         scr_writew(c, &chr);
1227         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1228 }
1229
1230 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1231 {
1232         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1233         struct fbcon_ops *ops = info->fbcon_par;
1234
1235         if (!fbcon_is_inactive(vc, info))
1236                 ops->clear_margins(vc, info, bottom_only);
1237 }
1238
1239 static void fbcon_cursor(struct vc_data *vc, int mode)
1240 {
1241         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1242         struct fbcon_ops *ops = info->fbcon_par;
1243         int y;
1244         int c = scr_readw((u16 *) vc->vc_pos);
1245
1246         if (fbcon_is_inactive(vc, info))
1247                 return;
1248
1249         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1250         if (mode & CM_SOFTBACK) {
1251                 mode &= ~CM_SOFTBACK;
1252                 y = softback_lines;
1253         } else {
1254                 if (softback_lines)
1255                         fbcon_set_origin(vc);
1256                 y = 0;
1257         }
1258
1259         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1260                     get_color(vc, info, c, 0));
1261         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1262 }
1263
1264 static int scrollback_phys_max = 0;
1265 static int scrollback_max = 0;
1266 static int scrollback_current = 0;
1267
1268 /*
1269  * If no vc is existent yet, just set struct display
1270  */
1271 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1272                               int unit)
1273 {
1274         struct display *p = &fb_display[unit];
1275         struct display *t = &fb_display[fg_console];
1276
1277         if (var_to_display(p, var, info))
1278                 return;
1279
1280         p->fontdata = t->fontdata;
1281         p->userfont = t->userfont;
1282         if (p->userfont)
1283                 REFCOUNT(p->fontdata)++;
1284 }
1285
1286 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1287                            struct vc_data *vc)
1288 {
1289         struct display *p = &fb_display[vc->vc_num], *t;
1290         struct vc_data **default_mode = vc->vc_display_fg;
1291         struct vc_data *svc = *default_mode;
1292         struct fbcon_ops *ops = info->fbcon_par;
1293         int rows, cols, charcnt = 256;
1294
1295         if (var_to_display(p, var, info))
1296                 return;
1297         t = &fb_display[svc->vc_num];
1298         if (!vc->vc_font.data) {
1299                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1300                 vc->vc_font.width = (*default_mode)->vc_font.width;
1301                 vc->vc_font.height = (*default_mode)->vc_font.height;
1302                 p->userfont = t->userfont;
1303                 if (p->userfont)
1304                         REFCOUNT(p->fontdata)++;
1305         }
1306         if (p->userfont)
1307                 charcnt = FNTCHARCNT(p->fontdata);
1308
1309         var->activate = FB_ACTIVATE_NOW;
1310         info->var.activate = var->activate;
1311         var->yoffset = info->var.yoffset;
1312         var->xoffset = info->var.xoffset;
1313         fb_set_var(info, var);
1314         ops->var = info->var;
1315         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1316         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1317         if (charcnt == 256) {
1318                 vc->vc_hi_font_mask = 0;
1319         } else {
1320                 vc->vc_hi_font_mask = 0x100;
1321                 if (vc->vc_can_do_color)
1322                         vc->vc_complement_mask <<= 1;
1323         }
1324
1325         if (!*svc->vc_uni_pagedir_loc)
1326                 con_set_default_unimap(svc);
1327         if (!*vc->vc_uni_pagedir_loc)
1328                 con_copy_unimap(vc, svc);
1329
1330         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1331         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1332         cols /= vc->vc_font.width;
1333         rows /= vc->vc_font.height;
1334         vc_resize(vc, cols, rows);
1335
1336         if (CON_IS_VISIBLE(vc)) {
1337                 update_screen(vc);
1338                 if (softback_buf)
1339                         fbcon_update_softback(vc);
1340         }
1341 }
1342
1343 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1344 {
1345         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1346         struct fbcon_ops *ops = info->fbcon_par;
1347         struct display *p = &fb_display[vc->vc_num];
1348         
1349         p->yscroll += count;
1350         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1351                 p->yscroll -= p->vrows;
1352         ops->var.xoffset = 0;
1353         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1354         ops->var.vmode |= FB_VMODE_YWRAP;
1355         ops->update_start(info);
1356         scrollback_max += count;
1357         if (scrollback_max > scrollback_phys_max)
1358                 scrollback_max = scrollback_phys_max;
1359         scrollback_current = 0;
1360 }
1361
1362 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1363 {
1364         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1365         struct fbcon_ops *ops = info->fbcon_par;
1366         struct display *p = &fb_display[vc->vc_num];
1367         
1368         p->yscroll -= count;
1369         if (p->yscroll < 0)     /* Deal with wrap */
1370                 p->yscroll += p->vrows;
1371         ops->var.xoffset = 0;
1372         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1373         ops->var.vmode |= FB_VMODE_YWRAP;
1374         ops->update_start(info);
1375         scrollback_max -= count;
1376         if (scrollback_max < 0)
1377                 scrollback_max = 0;
1378         scrollback_current = 0;
1379 }
1380
1381 static __inline__ void ypan_up(struct vc_data *vc, int count)
1382 {
1383         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1384         struct display *p = &fb_display[vc->vc_num];
1385         struct fbcon_ops *ops = info->fbcon_par;
1386
1387         p->yscroll += count;
1388         if (p->yscroll > p->vrows - vc->vc_rows) {
1389                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1390                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1391                 p->yscroll -= p->vrows - vc->vc_rows;
1392         }
1393
1394         ops->var.xoffset = 0;
1395         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1396         ops->var.vmode &= ~FB_VMODE_YWRAP;
1397         ops->update_start(info);
1398         fbcon_clear_margins(vc, 1);
1399         scrollback_max += count;
1400         if (scrollback_max > scrollback_phys_max)
1401                 scrollback_max = scrollback_phys_max;
1402         scrollback_current = 0;
1403 }
1404
1405 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1406 {
1407         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1408         struct fbcon_ops *ops = info->fbcon_par;
1409         struct display *p = &fb_display[vc->vc_num];
1410
1411         p->yscroll += count;
1412
1413         if (p->yscroll > p->vrows - vc->vc_rows) {
1414                 p->yscroll -= p->vrows - vc->vc_rows;
1415                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1416         }
1417
1418         ops->var.xoffset = 0;
1419         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1420         ops->var.vmode &= ~FB_VMODE_YWRAP;
1421         ops->update_start(info);
1422         fbcon_clear_margins(vc, 1);
1423         scrollback_max += count;
1424         if (scrollback_max > scrollback_phys_max)
1425                 scrollback_max = scrollback_phys_max;
1426         scrollback_current = 0;
1427 }
1428
1429 static __inline__ void ypan_down(struct vc_data *vc, int count)
1430 {
1431         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1432         struct display *p = &fb_display[vc->vc_num];
1433         struct fbcon_ops *ops = info->fbcon_par;
1434         
1435         p->yscroll -= count;
1436         if (p->yscroll < 0) {
1437                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1438                             0, vc->vc_rows, vc->vc_cols);
1439                 p->yscroll += p->vrows - vc->vc_rows;
1440         }
1441
1442         ops->var.xoffset = 0;
1443         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1444         ops->var.vmode &= ~FB_VMODE_YWRAP;
1445         ops->update_start(info);
1446         fbcon_clear_margins(vc, 1);
1447         scrollback_max -= count;
1448         if (scrollback_max < 0)
1449                 scrollback_max = 0;
1450         scrollback_current = 0;
1451 }
1452
1453 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1454 {
1455         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1456         struct fbcon_ops *ops = info->fbcon_par;
1457         struct display *p = &fb_display[vc->vc_num];
1458
1459         p->yscroll -= count;
1460
1461         if (p->yscroll < 0) {
1462                 p->yscroll += p->vrows - vc->vc_rows;
1463                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1464         }
1465
1466         ops->var.xoffset = 0;
1467         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1468         ops->var.vmode &= ~FB_VMODE_YWRAP;
1469         ops->update_start(info);
1470         fbcon_clear_margins(vc, 1);
1471         scrollback_max -= count;
1472         if (scrollback_max < 0)
1473                 scrollback_max = 0;
1474         scrollback_current = 0;
1475 }
1476
1477 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1478                                   long delta)
1479 {
1480         int count = vc->vc_rows;
1481         unsigned short *d, *s;
1482         unsigned long n;
1483         int line = 0;
1484
1485         d = (u16 *) softback_curr;
1486         if (d == (u16 *) softback_in)
1487                 d = (u16 *) vc->vc_origin;
1488         n = softback_curr + delta * vc->vc_size_row;
1489         softback_lines -= delta;
1490         if (delta < 0) {
1491                 if (softback_curr < softback_top && n < softback_buf) {
1492                         n += softback_end - softback_buf;
1493                         if (n < softback_top) {
1494                                 softback_lines -=
1495                                     (softback_top - n) / vc->vc_size_row;
1496                                 n = softback_top;
1497                         }
1498                 } else if (softback_curr >= softback_top
1499                            && n < softback_top) {
1500                         softback_lines -=
1501                             (softback_top - n) / vc->vc_size_row;
1502                         n = softback_top;
1503                 }
1504         } else {
1505                 if (softback_curr > softback_in && n >= softback_end) {
1506                         n += softback_buf - softback_end;
1507                         if (n > softback_in) {
1508                                 n = softback_in;
1509                                 softback_lines = 0;
1510                         }
1511                 } else if (softback_curr <= softback_in && n > softback_in) {
1512                         n = softback_in;
1513                         softback_lines = 0;
1514                 }
1515         }
1516         if (n == softback_curr)
1517                 return;
1518         softback_curr = n;
1519         s = (u16 *) softback_curr;
1520         if (s == (u16 *) softback_in)
1521                 s = (u16 *) vc->vc_origin;
1522         while (count--) {
1523                 unsigned short *start;
1524                 unsigned short *le;
1525                 unsigned short c;
1526                 int x = 0;
1527                 unsigned short attr = 1;
1528
1529                 start = s;
1530                 le = advance_row(s, 1);
1531                 do {
1532                         c = scr_readw(s);
1533                         if (attr != (c & 0xff00)) {
1534                                 attr = c & 0xff00;
1535                                 if (s > start) {
1536                                         fbcon_putcs(vc, start, s - start,
1537                                                     line, x);
1538                                         x += s - start;
1539                                         start = s;
1540                                 }
1541                         }
1542                         if (c == scr_readw(d)) {
1543                                 if (s > start) {
1544                                         fbcon_putcs(vc, start, s - start,
1545                                                     line, x);
1546                                         x += s - start + 1;
1547                                         start = s + 1;
1548                                 } else {
1549                                         x++;
1550                                         start++;
1551                                 }
1552                         }
1553                         s++;
1554                         d++;
1555                 } while (s < le);
1556                 if (s > start)
1557                         fbcon_putcs(vc, start, s - start, line, x);
1558                 line++;
1559                 if (d == (u16 *) softback_end)
1560                         d = (u16 *) softback_buf;
1561                 if (d == (u16 *) softback_in)
1562                         d = (u16 *) vc->vc_origin;
1563                 if (s == (u16 *) softback_end)
1564                         s = (u16 *) softback_buf;
1565                 if (s == (u16 *) softback_in)
1566                         s = (u16 *) vc->vc_origin;
1567         }
1568 }
1569
1570 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1571                               int line, int count, int dy)
1572 {
1573         unsigned short *s = (unsigned short *)
1574                 (vc->vc_origin + vc->vc_size_row * line);
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                 unsigned short attr = 1;
1582
1583                 do {
1584                         c = scr_readw(s);
1585                         if (attr != (c & 0xff00)) {
1586                                 attr = c & 0xff00;
1587                                 if (s > start) {
1588                                         fbcon_putcs(vc, start, s - start,
1589                                                     dy, x);
1590                                         x += s - start;
1591                                         start = s;
1592                                 }
1593                         }
1594                         console_conditional_schedule();
1595                         s++;
1596                 } while (s < le);
1597                 if (s > start)
1598                         fbcon_putcs(vc, start, s - start, dy, x);
1599                 console_conditional_schedule();
1600                 dy++;
1601         }
1602 }
1603
1604 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1605                          int line, int count, int offset)
1606 {
1607         unsigned short *d = (unsigned short *)
1608             (vc->vc_origin + vc->vc_size_row * line);
1609         unsigned short *s = d + offset;
1610
1611         while (count--) {
1612                 unsigned short *start = s;
1613                 unsigned short *le = advance_row(s, 1);
1614                 unsigned short c;
1615                 int x = 0;
1616                 unsigned short attr = 1;
1617
1618                 do {
1619                         c = scr_readw(s);
1620                         if (attr != (c & 0xff00)) {
1621                                 attr = c & 0xff00;
1622                                 if (s > start) {
1623                                         fbcon_putcs(vc, start, s - start,
1624                                                     line, x);
1625                                         x += s - start;
1626                                         start = s;
1627                                 }
1628                         }
1629                         if (c == scr_readw(d)) {
1630                                 if (s > start) {
1631                                         fbcon_putcs(vc, start, s - start,
1632                                                      line, x);
1633                                         x += s - start + 1;
1634                                         start = s + 1;
1635                                 } else {
1636                                         x++;
1637                                         start++;
1638                                 }
1639                         }
1640                         scr_writew(c, d);
1641                         console_conditional_schedule();
1642                         s++;
1643                         d++;
1644                 } while (s < le);
1645                 if (s > start)
1646                         fbcon_putcs(vc, start, s - start, line, x);
1647                 console_conditional_schedule();
1648                 if (offset > 0)
1649                         line++;
1650                 else {
1651                         line--;
1652                         /* NOTE: We subtract two lines from these pointers */
1653                         s -= vc->vc_size_row;
1654                         d -= vc->vc_size_row;
1655                 }
1656         }
1657 }
1658
1659 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1660                                        int count)
1661 {
1662         unsigned short *p;
1663
1664         if (vc->vc_num != fg_console)
1665                 return;
1666         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1667
1668         while (count) {
1669                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1670                 count--;
1671                 p = advance_row(p, 1);
1672                 softback_in += vc->vc_size_row;
1673                 if (softback_in == softback_end)
1674                         softback_in = softback_buf;
1675                 if (softback_in == softback_top) {
1676                         softback_top += vc->vc_size_row;
1677                         if (softback_top == softback_end)
1678                                 softback_top = softback_buf;
1679                 }
1680         }
1681         softback_curr = softback_in;
1682 }
1683
1684 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1685                         int count)
1686 {
1687         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1688         struct display *p = &fb_display[vc->vc_num];
1689         struct fbcon_ops *ops = info->fbcon_par;
1690         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1691
1692         if (fbcon_is_inactive(vc, info))
1693                 return -EINVAL;
1694
1695         fbcon_cursor(vc, CM_ERASE);
1696
1697         /*
1698          * ++Geert: Only use ywrap/ypan if the console is in text mode
1699          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1700          *           whole screen (prevents flicker).
1701          */
1702
1703         switch (dir) {
1704         case SM_UP:
1705                 if (count > vc->vc_rows)        /* Maximum realistic size */
1706                         count = vc->vc_rows;
1707                 if (softback_top)
1708                         fbcon_softback_note(vc, t, count);
1709                 if (logo_shown >= 0)
1710                         goto redraw_up;
1711                 switch (p->scrollmode) {
1712                 case SCROLL_MOVE:
1713                         ops->bmove(vc, info, t + count, 0, t, 0,
1714                                     b - t - count, vc->vc_cols);
1715                         ops->clear(vc, info, b - count, 0, count,
1716                                   vc->vc_cols);
1717                         break;
1718
1719                 case SCROLL_WRAP_MOVE:
1720                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1721                                 if (t > 0)
1722                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1723                                                     vc->vc_cols);
1724                                 ywrap_up(vc, count);
1725                                 if (vc->vc_rows - b > 0)
1726                                         fbcon_bmove(vc, b - count, 0, b, 0,
1727                                                     vc->vc_rows - b,
1728                                                     vc->vc_cols);
1729                         } else if (info->flags & FBINFO_READS_FAST)
1730                                 fbcon_bmove(vc, t + count, 0, t, 0,
1731                                             b - t - count, vc->vc_cols);
1732                         else
1733                                 goto redraw_up;
1734                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1735                         break;
1736
1737                 case SCROLL_PAN_REDRAW:
1738                         if ((p->yscroll + count <=
1739                              2 * (p->vrows - vc->vc_rows))
1740                             && ((!scroll_partial && (b - t == vc->vc_rows))
1741                                 || (scroll_partial
1742                                     && (b - t - count >
1743                                         3 * vc->vc_rows >> 2)))) {
1744                                 if (t > 0)
1745                                         fbcon_redraw_move(vc, p, 0, t, count);
1746                                 ypan_up_redraw(vc, t, count);
1747                                 if (vc->vc_rows - b > 0)
1748                                         fbcon_redraw_move(vc, p, b,
1749                                                           vc->vc_rows - b, b);
1750                         } else
1751                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1752                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1753                         break;
1754
1755                 case SCROLL_PAN_MOVE:
1756                         if ((p->yscroll + count <=
1757                              2 * (p->vrows - vc->vc_rows))
1758                             && ((!scroll_partial && (b - t == vc->vc_rows))
1759                                 || (scroll_partial
1760                                     && (b - t - count >
1761                                         3 * vc->vc_rows >> 2)))) {
1762                                 if (t > 0)
1763                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1764                                                     vc->vc_cols);
1765                                 ypan_up(vc, count);
1766                                 if (vc->vc_rows - b > 0)
1767                                         fbcon_bmove(vc, b - count, 0, b, 0,
1768                                                     vc->vc_rows - b,
1769                                                     vc->vc_cols);
1770                         } else if (info->flags & FBINFO_READS_FAST)
1771                                 fbcon_bmove(vc, t + count, 0, t, 0,
1772                                             b - t - count, vc->vc_cols);
1773                         else
1774                                 goto redraw_up;
1775                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1776                         break;
1777
1778                 case SCROLL_REDRAW:
1779                       redraw_up:
1780                         fbcon_redraw(vc, p, t, b - t - count,
1781                                      count * vc->vc_cols);
1782                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1783                         scr_memsetw((unsigned short *) (vc->vc_origin +
1784                                                         vc->vc_size_row *
1785                                                         (b - count)),
1786                                     vc->vc_video_erase_char,
1787                                     vc->vc_size_row * count);
1788                         return 1;
1789                 }
1790                 break;
1791
1792         case SM_DOWN:
1793                 if (count > vc->vc_rows)        /* Maximum realistic size */
1794                         count = vc->vc_rows;
1795                 if (logo_shown >= 0)
1796                         goto redraw_down;
1797                 switch (p->scrollmode) {
1798                 case SCROLL_MOVE:
1799                         ops->bmove(vc, info, t, 0, t + count, 0,
1800                                     b - t - count, vc->vc_cols);
1801                         ops->clear(vc, info, t, 0, count, vc->vc_cols);
1802                         break;
1803
1804                 case SCROLL_WRAP_MOVE:
1805                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1806                                 if (vc->vc_rows - b > 0)
1807                                         fbcon_bmove(vc, b, 0, b - count, 0,
1808                                                     vc->vc_rows - b,
1809                                                     vc->vc_cols);
1810                                 ywrap_down(vc, count);
1811                                 if (t > 0)
1812                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1813                                                     vc->vc_cols);
1814                         } else if (info->flags & FBINFO_READS_FAST)
1815                                 fbcon_bmove(vc, t, 0, t + count, 0,
1816                                             b - t - count, vc->vc_cols);
1817                         else
1818                                 goto redraw_down;
1819                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1820                         break;
1821
1822                 case SCROLL_PAN_MOVE:
1823                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1824                             && ((!scroll_partial && (b - t == vc->vc_rows))
1825                                 || (scroll_partial
1826                                     && (b - t - count >
1827                                         3 * vc->vc_rows >> 2)))) {
1828                                 if (vc->vc_rows - b > 0)
1829                                         fbcon_bmove(vc, b, 0, b - count, 0,
1830                                                     vc->vc_rows - b,
1831                                                     vc->vc_cols);
1832                                 ypan_down(vc, count);
1833                                 if (t > 0)
1834                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1835                                                     vc->vc_cols);
1836                         } else if (info->flags & FBINFO_READS_FAST)
1837                                 fbcon_bmove(vc, t, 0, t + count, 0,
1838                                             b - t - count, vc->vc_cols);
1839                         else
1840                                 goto redraw_down;
1841                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1842                         break;
1843
1844                 case SCROLL_PAN_REDRAW:
1845                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1846                             && ((!scroll_partial && (b - t == vc->vc_rows))
1847                                 || (scroll_partial
1848                                     && (b - t - count >
1849                                         3 * vc->vc_rows >> 2)))) {
1850                                 if (vc->vc_rows - b > 0)
1851                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1852                                                           b - count);
1853                                 ypan_down_redraw(vc, t, count);
1854                                 if (t > 0)
1855                                         fbcon_redraw_move(vc, p, count, t, 0);
1856                         } else
1857                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1858                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1859                         break;
1860
1861                 case SCROLL_REDRAW:
1862                       redraw_down:
1863                         fbcon_redraw(vc, p, b - 1, b - t - count,
1864                                      -count * vc->vc_cols);
1865                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1866                         scr_memsetw((unsigned short *) (vc->vc_origin +
1867                                                         vc->vc_size_row *
1868                                                         t),
1869                                     vc->vc_video_erase_char,
1870                                     vc->vc_size_row * count);
1871                         return 1;
1872                 }
1873         }
1874         return 0;
1875 }
1876
1877
1878 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1879                         int height, int width)
1880 {
1881         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1882         struct display *p = &fb_display[vc->vc_num];
1883         
1884         if (fbcon_is_inactive(vc, info))
1885                 return;
1886
1887         if (!width || !height)
1888                 return;
1889
1890         /*  Split blits that cross physical y_wrap case.
1891          *  Pathological case involves 4 blits, better to use recursive
1892          *  code rather than unrolled case
1893          *
1894          *  Recursive invocations don't need to erase the cursor over and
1895          *  over again, so we use fbcon_bmove_rec()
1896          */
1897         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1898                         p->vrows - p->yscroll);
1899 }
1900
1901 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx, 
1902                             int dy, int dx, int height, int width, u_int y_break)
1903 {
1904         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1905         struct fbcon_ops *ops = info->fbcon_par;
1906         u_int b;
1907
1908         if (sy < y_break && sy + height > y_break) {
1909                 b = y_break - sy;
1910                 if (dy < sy) {  /* Avoid trashing self */
1911                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1912                                         y_break);
1913                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1914                                         height - b, width, y_break);
1915                 } else {
1916                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1917                                         height - b, width, y_break);
1918                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1919                                         y_break);
1920                 }
1921                 return;
1922         }
1923
1924         if (dy < y_break && dy + height > y_break) {
1925                 b = y_break - dy;
1926                 if (dy < sy) {  /* Avoid trashing self */
1927                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1928                                         y_break);
1929                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1930                                         height - b, width, y_break);
1931                 } else {
1932                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1933                                         height - b, width, y_break);
1934                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1935                                         y_break);
1936                 }
1937                 return;
1938         }
1939         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1940                    height, width);
1941 }
1942
1943 static __inline__ void updatescrollmode(struct display *p,
1944                                         struct fb_info *info,
1945                                         struct vc_data *vc)
1946 {
1947         struct fbcon_ops *ops = info->fbcon_par;
1948         int fh = vc->vc_font.height;
1949         int cap = info->flags;
1950         u16 t = 0;
1951         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
1952                                   info->fix.xpanstep);
1953         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
1954         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1955         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1956                                    info->var.xres_virtual);
1957         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
1958                 divides(ypan, vc->vc_font.height) && vyres > yres;
1959         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
1960                 divides(ywrap, vc->vc_font.height) &&
1961                 divides(vc->vc_font.height, vyres) &&
1962                 divides(vc->vc_font.height, yres);
1963         int reading_fast = cap & FBINFO_READS_FAST;
1964         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
1965                 !(cap & FBINFO_HWACCEL_DISABLED);
1966         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
1967                 !(cap & FBINFO_HWACCEL_DISABLED);
1968
1969         p->vrows = vyres/fh;
1970         if (yres > (fh * (vc->vc_rows + 1)))
1971                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
1972         if ((yres % fh) && (vyres % fh < yres % fh))
1973                 p->vrows--;
1974
1975         if (good_wrap || good_pan) {
1976                 if (reading_fast || fast_copyarea)
1977                         p->scrollmode = good_wrap ?
1978                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1979                 else
1980                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
1981                                 SCROLL_PAN_REDRAW;
1982         } else {
1983                 if (reading_fast || (fast_copyarea && !fast_imageblit))
1984                         p->scrollmode = SCROLL_MOVE;
1985                 else
1986                         p->scrollmode = SCROLL_REDRAW;
1987         }
1988 }
1989
1990 static int fbcon_resize(struct vc_data *vc, unsigned int width, 
1991                         unsigned int height)
1992 {
1993         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1994         struct fbcon_ops *ops = info->fbcon_par;
1995         struct display *p = &fb_display[vc->vc_num];
1996         struct fb_var_screeninfo var = info->var;
1997         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
1998
1999         virt_w = FBCON_SWAP(ops->rotate, width, height);
2000         virt_h = FBCON_SWAP(ops->rotate, height, width);
2001         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2002                                  vc->vc_font.height);
2003         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2004                                  vc->vc_font.width);
2005         var.xres = virt_w * virt_fw;
2006         var.yres = virt_h * virt_fh;
2007         x_diff = info->var.xres - var.xres;
2008         y_diff = info->var.yres - var.yres;
2009         if (x_diff < 0 || x_diff > virt_fw ||
2010             y_diff < 0 || y_diff > virt_fh) {
2011                 struct fb_videomode *mode;
2012
2013                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2014                 mode = fb_find_best_mode(&var, &info->modelist);
2015                 if (mode == NULL)
2016                         return -EINVAL;
2017                 display_to_var(&var, p);
2018                 fb_videomode_to_var(&var, mode);
2019
2020                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2021                         return -EINVAL;
2022
2023                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2024                 if (CON_IS_VISIBLE(vc)) {
2025                         var.activate = FB_ACTIVATE_NOW |
2026                                 FB_ACTIVATE_FORCE;
2027                         fb_set_var(info, &var);
2028                 }
2029                 var_to_display(p, &info->var, info);
2030                 ops->var = info->var;
2031         }
2032         updatescrollmode(p, info, vc);
2033         return 0;
2034 }
2035
2036 static int fbcon_switch(struct vc_data *vc)
2037 {
2038         struct fb_info *info, *old_info = NULL;
2039         struct fbcon_ops *ops;
2040         struct display *p = &fb_display[vc->vc_num];
2041         struct fb_var_screeninfo var;
2042         int i, prev_console, charcnt = 256;
2043
2044         info = registered_fb[con2fb_map[vc->vc_num]];
2045         ops = info->fbcon_par;
2046
2047         if (softback_top) {
2048                 if (softback_lines)
2049                         fbcon_set_origin(vc);
2050                 softback_top = softback_curr = softback_in = softback_buf;
2051                 softback_lines = 0;
2052                 fbcon_update_softback(vc);
2053         }
2054
2055         if (logo_shown >= 0) {
2056                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2057
2058                 if (conp2->vc_top == logo_lines
2059                     && conp2->vc_bottom == conp2->vc_rows)
2060                         conp2->vc_top = 0;
2061                 logo_shown = FBCON_LOGO_CANSHOW;
2062         }
2063
2064         prev_console = ops->currcon;
2065         if (prev_console != -1)
2066                 old_info = registered_fb[con2fb_map[prev_console]];
2067         /*
2068          * FIXME: If we have multiple fbdev's loaded, we need to
2069          * update all info->currcon.  Perhaps, we can place this
2070          * in a centralized structure, but this might break some
2071          * drivers.
2072          *
2073          * info->currcon = vc->vc_num;
2074          */
2075         for (i = 0; i < FB_MAX; i++) {
2076                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2077                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2078
2079                         o->currcon = vc->vc_num;
2080                 }
2081         }
2082         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2083         display_to_var(&var, p);
2084         var.activate = FB_ACTIVATE_NOW;
2085
2086         /*
2087          * make sure we don't unnecessarily trip the memcmp()
2088          * in fb_set_var()
2089          */
2090         info->var.activate = var.activate;
2091         var.yoffset = info->var.yoffset;
2092         var.xoffset = info->var.xoffset;
2093         var.vmode = info->var.vmode;
2094         fb_set_var(info, &var);
2095         ops->var = info->var;
2096
2097         if (old_info != NULL && (old_info != info ||
2098                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2099                 if (info->fbops->fb_set_par)
2100                         info->fbops->fb_set_par(info);
2101
2102                 if (old_info != info) {
2103                         fbcon_del_cursor_timer(old_info);
2104                         fbcon_add_cursor_timer(info);
2105                 }
2106         }
2107
2108         set_blitting_type(vc, info);
2109         ops->cursor_reset = 1;
2110
2111         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2112                 ops->rotate = FB_ROTATE_UR;
2113                 set_blitting_type(vc, info);
2114         }
2115
2116         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2117         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2118
2119         if (p->userfont)
2120                 charcnt = FNTCHARCNT(vc->vc_font.data);
2121
2122         if (charcnt > 256)
2123                 vc->vc_complement_mask <<= 1;
2124
2125         updatescrollmode(p, info, vc);
2126
2127         switch (p->scrollmode) {
2128         case SCROLL_WRAP_MOVE:
2129                 scrollback_phys_max = p->vrows - vc->vc_rows;
2130                 break;
2131         case SCROLL_PAN_MOVE:
2132         case SCROLL_PAN_REDRAW:
2133                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2134                 if (scrollback_phys_max < 0)
2135                         scrollback_phys_max = 0;
2136                 break;
2137         default:
2138                 scrollback_phys_max = 0;
2139                 break;
2140         }
2141
2142         scrollback_max = 0;
2143         scrollback_current = 0;
2144
2145         if (!fbcon_is_inactive(vc, info)) {
2146             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2147             ops->update_start(info);
2148         }
2149
2150         fbcon_set_palette(vc, color_table);     
2151         fbcon_clear_margins(vc, 0);
2152
2153         if (logo_shown == FBCON_LOGO_DRAW) {
2154
2155                 logo_shown = fg_console;
2156                 /* This is protected above by initmem_freed */
2157                 fb_show_logo(info, ops->rotate);
2158                 update_region(vc,
2159                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2160                               vc->vc_size_row * (vc->vc_bottom -
2161                                                  vc->vc_top) / 2);
2162                 return 0;
2163         }
2164         return 1;
2165 }
2166
2167 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2168                                 int blank)
2169 {
2170         if (blank) {
2171                 unsigned short charmask = vc->vc_hi_font_mask ?
2172                         0x1ff : 0xff;
2173                 unsigned short oldc;
2174
2175                 oldc = vc->vc_video_erase_char;
2176                 vc->vc_video_erase_char &= charmask;
2177                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2178                 vc->vc_video_erase_char = oldc;
2179         }
2180 }
2181
2182 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2183 {
2184         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2185         struct fbcon_ops *ops = info->fbcon_par;
2186
2187         if (mode_switch) {
2188                 struct fb_var_screeninfo var = info->var;
2189
2190                 ops->graphics = 1;
2191
2192                 if (!blank) {
2193                         if (info->fbops->fb_save_state)
2194                                 info->fbops->fb_save_state(info);
2195                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2196                         fb_set_var(info, &var);
2197                         ops->graphics = 0;
2198                         ops->var = info->var;
2199                 } else if (info->fbops->fb_restore_state)
2200                         info->fbops->fb_restore_state(info);
2201         }
2202
2203         if (!fbcon_is_inactive(vc, info)) {
2204                 if (ops->blank_state != blank) {
2205                         ops->blank_state = blank;
2206                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2207                         ops->cursor_flash = (!blank);
2208
2209                         if (fb_blank(info, blank))
2210                                 fbcon_generic_blank(vc, info, blank);
2211                 }
2212
2213                 if (!blank)
2214                         update_screen(vc);
2215         }
2216
2217         if (!blank)
2218                 fbcon_add_cursor_timer(info);
2219         else
2220                 fbcon_del_cursor_timer(info);
2221
2222         return 0;
2223 }
2224
2225 static void fbcon_free_font(struct display *p)
2226 {
2227         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
2228                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
2229         p->fontdata = NULL;
2230         p->userfont = 0;
2231 }
2232
2233 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2234 {
2235         u8 *fontdata = vc->vc_font.data;
2236         u8 *data = font->data;
2237         int i, j;
2238
2239         font->width = vc->vc_font.width;
2240         font->height = vc->vc_font.height;
2241         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2242         if (!font->data)
2243                 return 0;
2244
2245         if (font->width <= 8) {
2246                 j = vc->vc_font.height;
2247                 for (i = 0; i < font->charcount; i++) {
2248                         memcpy(data, fontdata, j);
2249                         memset(data + j, 0, 32 - j);
2250                         data += 32;
2251                         fontdata += j;
2252                 }
2253         } else if (font->width <= 16) {
2254                 j = vc->vc_font.height * 2;
2255                 for (i = 0; i < font->charcount; i++) {
2256                         memcpy(data, fontdata, j);
2257                         memset(data + j, 0, 64 - j);
2258                         data += 64;
2259                         fontdata += j;
2260                 }
2261         } else if (font->width <= 24) {
2262                 for (i = 0; i < font->charcount; i++) {
2263                         for (j = 0; j < vc->vc_font.height; j++) {
2264                                 *data++ = fontdata[0];
2265                                 *data++ = fontdata[1];
2266                                 *data++ = fontdata[2];
2267                                 fontdata += sizeof(u32);
2268                         }
2269                         memset(data, 0, 3 * (32 - j));
2270                         data += 3 * (32 - j);
2271                 }
2272         } else {
2273                 j = vc->vc_font.height * 4;
2274                 for (i = 0; i < font->charcount; i++) {
2275                         memcpy(data, fontdata, j);
2276                         memset(data + j, 0, 128 - j);
2277                         data += 128;
2278                         fontdata += j;
2279                 }
2280         }
2281         return 0;
2282 }
2283
2284 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2285                              const u8 * data, int userfont)
2286 {
2287         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2288         struct fbcon_ops *ops = info->fbcon_par;
2289         struct display *p = &fb_display[vc->vc_num];
2290         int resize;
2291         int cnt;
2292         char *old_data = NULL;
2293
2294         if (CON_IS_VISIBLE(vc) && softback_lines)
2295                 fbcon_set_origin(vc);
2296
2297         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2298         if (p->userfont)
2299                 old_data = vc->vc_font.data;
2300         if (userfont)
2301                 cnt = FNTCHARCNT(data);
2302         else
2303                 cnt = 256;
2304         vc->vc_font.data = (void *)(p->fontdata = data);
2305         if ((p->userfont = userfont))
2306                 REFCOUNT(data)++;
2307         vc->vc_font.width = w;
2308         vc->vc_font.height = h;
2309         if (vc->vc_hi_font_mask && cnt == 256) {
2310                 vc->vc_hi_font_mask = 0;
2311                 if (vc->vc_can_do_color) {
2312                         vc->vc_complement_mask >>= 1;
2313                         vc->vc_s_complement_mask >>= 1;
2314                 }
2315                         
2316                 /* ++Edmund: reorder the attribute bits */
2317                 if (vc->vc_can_do_color) {
2318                         unsigned short *cp =
2319                             (unsigned short *) vc->vc_origin;
2320                         int count = vc->vc_screenbuf_size / 2;
2321                         unsigned short c;
2322                         for (; count > 0; count--, cp++) {
2323                                 c = scr_readw(cp);
2324                                 scr_writew(((c & 0xfe00) >> 1) |
2325                                            (c & 0xff), cp);
2326                         }
2327                         c = vc->vc_video_erase_char;
2328                         vc->vc_video_erase_char =
2329                             ((c & 0xfe00) >> 1) | (c & 0xff);
2330                         vc->vc_attr >>= 1;
2331                 }
2332         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2333                 vc->vc_hi_font_mask = 0x100;
2334                 if (vc->vc_can_do_color) {
2335                         vc->vc_complement_mask <<= 1;
2336                         vc->vc_s_complement_mask <<= 1;
2337                 }
2338                         
2339                 /* ++Edmund: reorder the attribute bits */
2340                 {
2341                         unsigned short *cp =
2342                             (unsigned short *) vc->vc_origin;
2343                         int count = vc->vc_screenbuf_size / 2;
2344                         unsigned short c;
2345                         for (; count > 0; count--, cp++) {
2346                                 unsigned short newc;
2347                                 c = scr_readw(cp);
2348                                 if (vc->vc_can_do_color)
2349                                         newc =
2350                                             ((c & 0xff00) << 1) | (c &
2351                                                                    0xff);
2352                                 else
2353                                         newc = c & ~0x100;
2354                                 scr_writew(newc, cp);
2355                         }
2356                         c = vc->vc_video_erase_char;
2357                         if (vc->vc_can_do_color) {
2358                                 vc->vc_video_erase_char =
2359                                     ((c & 0xff00) << 1) | (c & 0xff);
2360                                 vc->vc_attr <<= 1;
2361                         } else
2362                                 vc->vc_video_erase_char = c & ~0x100;
2363                 }
2364
2365         }
2366
2367         if (resize) {
2368                 int cols, rows;
2369
2370                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2371                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2372                 cols /= w;
2373                 rows /= h;
2374                 vc_resize(vc, cols, rows);
2375                 if (CON_IS_VISIBLE(vc) && softback_buf)
2376                         fbcon_update_softback(vc);
2377         } else if (CON_IS_VISIBLE(vc)
2378                    && vc->vc_mode == KD_TEXT) {
2379                 fbcon_clear_margins(vc, 0);
2380                 update_screen(vc);
2381         }
2382
2383         if (old_data && (--REFCOUNT(old_data) == 0))
2384                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2385         return 0;
2386 }
2387
2388 static int fbcon_copy_font(struct vc_data *vc, int con)
2389 {
2390         struct display *od = &fb_display[con];
2391         struct console_font *f = &vc->vc_font;
2392
2393         if (od->fontdata == f->data)
2394                 return 0;       /* already the same font... */
2395         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2396 }
2397
2398 /*
2399  *  User asked to set font; we are guaranteed that
2400  *      a) width and height are in range 1..32
2401  *      b) charcount does not exceed 512
2402  *  but lets not assume that, since someone might someday want to use larger
2403  *  fonts. And charcount of 512 is small for unicode support.
2404  *
2405  *  However, user space gives the font in 32 rows , regardless of
2406  *  actual font height. So a new API is needed if support for larger fonts
2407  *  is ever implemented.
2408  */
2409
2410 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2411 {
2412         unsigned charcount = font->charcount;
2413         int w = font->width;
2414         int h = font->height;
2415         int size;
2416         int i, csum;
2417         u8 *new_data, *data = font->data;
2418         int pitch = (font->width+7) >> 3;
2419
2420         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2421          * If not this check should be changed to charcount < 256 */
2422         if (charcount != 256 && charcount != 512)
2423                 return -EINVAL;
2424
2425         size = h * pitch * charcount;
2426
2427         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2428
2429         if (!new_data)
2430                 return -ENOMEM;
2431
2432         new_data += FONT_EXTRA_WORDS * sizeof(int);
2433         FNTSIZE(new_data) = size;
2434         FNTCHARCNT(new_data) = charcount;
2435         REFCOUNT(new_data) = 0; /* usage counter */
2436         for (i=0; i< charcount; i++) {
2437                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2438         }
2439
2440         /* Since linux has a nice crc32 function use it for counting font
2441          * checksums. */
2442         csum = crc32(0, new_data, size);
2443
2444         FNTSUM(new_data) = csum;
2445         /* Check if the same font is on some other console already */
2446         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2447                 struct vc_data *tmp = vc_cons[i].d;
2448                 
2449                 if (fb_display[i].userfont &&
2450                     fb_display[i].fontdata &&
2451                     FNTSUM(fb_display[i].fontdata) == csum &&
2452                     FNTSIZE(fb_display[i].fontdata) == size &&
2453                     tmp->vc_font.width == w &&
2454                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2455                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2456                         new_data = (u8 *)fb_display[i].fontdata;
2457                         break;
2458                 }
2459         }
2460         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2461 }
2462
2463 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2464 {
2465         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2466         const struct font_desc *f;
2467
2468         if (!name)
2469                 f = get_default_font(info->var.xres, info->var.yres);
2470         else if (!(f = find_font(name)))
2471                 return -ENOENT;
2472
2473         font->width = f->width;
2474         font->height = f->height;
2475         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2476 }
2477
2478 static u16 palette_red[16];
2479 static u16 palette_green[16];
2480 static u16 palette_blue[16];
2481
2482 static struct fb_cmap palette_cmap = {
2483         0, 16, palette_red, palette_green, palette_blue, NULL
2484 };
2485
2486 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2487 {
2488         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2489         int i, j, k, depth;
2490         u8 val;
2491
2492         if (fbcon_is_inactive(vc, info))
2493                 return -EINVAL;
2494
2495         if (!CON_IS_VISIBLE(vc))
2496                 return 0;
2497
2498         depth = fb_get_color_depth(&info->var, &info->fix);
2499         if (depth > 3) {
2500                 for (i = j = 0; i < 16; i++) {
2501                         k = table[i];
2502                         val = vc->vc_palette[j++];
2503                         palette_red[k] = (val << 8) | val;
2504                         val = vc->vc_palette[j++];
2505                         palette_green[k] = (val << 8) | val;
2506                         val = vc->vc_palette[j++];
2507                         palette_blue[k] = (val << 8) | val;
2508                 }
2509                 palette_cmap.len = 16;
2510                 palette_cmap.start = 0;
2511         /*
2512          * If framebuffer is capable of less than 16 colors,
2513          * use default palette of fbcon.
2514          */
2515         } else
2516                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2517
2518         return fb_set_cmap(&palette_cmap, info);
2519 }
2520
2521 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2522 {
2523         unsigned long p;
2524         int line;
2525         
2526         if (vc->vc_num != fg_console || !softback_lines)
2527                 return (u16 *) (vc->vc_origin + offset);
2528         line = offset / vc->vc_size_row;
2529         if (line >= softback_lines)
2530                 return (u16 *) (vc->vc_origin + offset -
2531                                 softback_lines * vc->vc_size_row);
2532         p = softback_curr + offset;
2533         if (p >= softback_end)
2534                 p += softback_buf - softback_end;
2535         return (u16 *) p;
2536 }
2537
2538 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2539                                  int *px, int *py)
2540 {
2541         unsigned long ret;
2542         int x, y;
2543
2544         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2545                 unsigned long offset = (pos - vc->vc_origin) / 2;
2546
2547                 x = offset % vc->vc_cols;
2548                 y = offset / vc->vc_cols;
2549                 if (vc->vc_num == fg_console)
2550                         y += softback_lines;
2551                 ret = pos + (vc->vc_cols - x) * 2;
2552         } else if (vc->vc_num == fg_console && softback_lines) {
2553                 unsigned long offset = pos - softback_curr;
2554
2555                 if (pos < softback_curr)
2556                         offset += softback_end - softback_buf;
2557                 offset /= 2;
2558                 x = offset % vc->vc_cols;
2559                 y = offset / vc->vc_cols;
2560                 ret = pos + (vc->vc_cols - x) * 2;
2561                 if (ret == softback_end)
2562                         ret = softback_buf;
2563                 if (ret == softback_in)
2564                         ret = vc->vc_origin;
2565         } else {
2566                 /* Should not happen */
2567                 x = y = 0;
2568                 ret = vc->vc_origin;
2569         }
2570         if (px)
2571                 *px = x;
2572         if (py)
2573                 *py = y;
2574         return ret;
2575 }
2576
2577 /* As we might be inside of softback, we may work with non-contiguous buffer,
2578    that's why we have to use a separate routine. */
2579 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2580 {
2581         while (cnt--) {
2582                 u16 a = scr_readw(p);
2583                 if (!vc->vc_can_do_color)
2584                         a ^= 0x0800;
2585                 else if (vc->vc_hi_font_mask == 0x100)
2586                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2587                             (((a) & 0x0e00) << 4);
2588                 else
2589                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2590                             (((a) & 0x0700) << 4);
2591                 scr_writew(a, p++);
2592                 if (p == (u16 *) softback_end)
2593                         p = (u16 *) softback_buf;
2594                 if (p == (u16 *) softback_in)
2595                         p = (u16 *) vc->vc_origin;
2596         }
2597 }
2598
2599 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2600 {
2601         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2602         struct fbcon_ops *ops = info->fbcon_par;
2603         struct display *p = &fb_display[fg_console];
2604         int offset, limit, scrollback_old;
2605
2606         if (softback_top) {
2607                 if (vc->vc_num != fg_console)
2608                         return 0;
2609                 if (vc->vc_mode != KD_TEXT || !lines)
2610                         return 0;
2611                 if (logo_shown >= 0) {
2612                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2613
2614                         if (conp2->vc_top == logo_lines
2615                             && conp2->vc_bottom == conp2->vc_rows)
2616                                 conp2->vc_top = 0;
2617                         if (logo_shown == vc->vc_num) {
2618                                 unsigned long p, q;
2619                                 int i;
2620
2621                                 p = softback_in;
2622                                 q = vc->vc_origin +
2623                                     logo_lines * vc->vc_size_row;
2624                                 for (i = 0; i < logo_lines; i++) {
2625                                         if (p == softback_top)
2626                                                 break;
2627                                         if (p == softback_buf)
2628                                                 p = softback_end;
2629                                         p -= vc->vc_size_row;
2630                                         q -= vc->vc_size_row;
2631                                         scr_memcpyw((u16 *) q, (u16 *) p,
2632                                                     vc->vc_size_row);
2633                                 }
2634                                 softback_in = softback_curr = p;
2635                                 update_region(vc, vc->vc_origin,
2636                                               logo_lines * vc->vc_cols);
2637                         }
2638                         logo_shown = FBCON_LOGO_CANSHOW;
2639                 }
2640                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2641                 fbcon_redraw_softback(vc, p, lines);
2642                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2643                 return 0;
2644         }
2645
2646         if (!scrollback_phys_max)
2647                 return -ENOSYS;
2648
2649         scrollback_old = scrollback_current;
2650         scrollback_current -= lines;
2651         if (scrollback_current < 0)
2652                 scrollback_current = 0;
2653         else if (scrollback_current > scrollback_max)
2654                 scrollback_current = scrollback_max;
2655         if (scrollback_current == scrollback_old)
2656                 return 0;
2657
2658         if (fbcon_is_inactive(vc, info))
2659                 return 0;
2660
2661         fbcon_cursor(vc, CM_ERASE);
2662
2663         offset = p->yscroll - scrollback_current;
2664         limit = p->vrows;
2665         switch (p->scrollmode) {
2666         case SCROLL_WRAP_MOVE:
2667                 info->var.vmode |= FB_VMODE_YWRAP;
2668                 break;
2669         case SCROLL_PAN_MOVE:
2670         case SCROLL_PAN_REDRAW:
2671                 limit -= vc->vc_rows;
2672                 info->var.vmode &= ~FB_VMODE_YWRAP;
2673                 break;
2674         }
2675         if (offset < 0)
2676                 offset += limit;
2677         else if (offset >= limit)
2678                 offset -= limit;
2679
2680         ops->var.xoffset = 0;
2681         ops->var.yoffset = offset * vc->vc_font.height;
2682         ops->update_start(info);
2683
2684         if (!scrollback_current)
2685                 fbcon_cursor(vc, CM_DRAW);
2686         return 0;
2687 }
2688
2689 static int fbcon_set_origin(struct vc_data *vc)
2690 {
2691         if (softback_lines)
2692                 fbcon_scrolldelta(vc, softback_lines);
2693         return 0;
2694 }
2695
2696 static void fbcon_suspended(struct fb_info *info)
2697 {
2698         struct vc_data *vc = NULL;
2699         struct fbcon_ops *ops = info->fbcon_par;
2700
2701         if (!ops || ops->currcon < 0)
2702                 return;
2703         vc = vc_cons[ops->currcon].d;
2704
2705         /* Clear cursor, restore saved data */
2706         fbcon_cursor(vc, CM_ERASE);
2707 }
2708
2709 static void fbcon_resumed(struct fb_info *info)
2710 {
2711         struct vc_data *vc;
2712         struct fbcon_ops *ops = info->fbcon_par;
2713
2714         if (!ops || ops->currcon < 0)
2715                 return;
2716         vc = vc_cons[ops->currcon].d;
2717
2718         update_screen(vc);
2719 }
2720
2721 static void fbcon_modechanged(struct fb_info *info)
2722 {
2723         struct fbcon_ops *ops = info->fbcon_par;
2724         struct vc_data *vc;
2725         struct display *p;
2726         int rows, cols;
2727
2728         if (!ops || ops->currcon < 0)
2729                 return;
2730         vc = vc_cons[ops->currcon].d;
2731         if (vc->vc_mode != KD_TEXT ||
2732             registered_fb[con2fb_map[ops->currcon]] != info)
2733                 return;
2734
2735         p = &fb_display[vc->vc_num];
2736         set_blitting_type(vc, info);
2737
2738         if (CON_IS_VISIBLE(vc)) {
2739                 var_to_display(p, &info->var, info);
2740                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2741                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2742                 cols /= vc->vc_font.width;
2743                 rows /= vc->vc_font.height;
2744                 vc_resize(vc, cols, rows);
2745                 updatescrollmode(p, info, vc);
2746                 scrollback_max = 0;
2747                 scrollback_current = 0;
2748
2749                 if (!fbcon_is_inactive(vc, info)) {
2750                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2751                     ops->update_start(info);
2752                 }
2753
2754                 fbcon_set_palette(vc, color_table);
2755                 update_screen(vc);
2756                 if (softback_buf)
2757                         fbcon_update_softback(vc);
2758         }
2759 }
2760
2761 static void fbcon_set_all_vcs(struct fb_info *info)
2762 {
2763         struct fbcon_ops *ops = info->fbcon_par;
2764         struct vc_data *vc;
2765         struct display *p;
2766         int i, rows, cols;
2767
2768         if (!ops || ops->currcon < 0)
2769                 return;
2770
2771         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2772                 vc = vc_cons[i].d;
2773                 if (!vc || vc->vc_mode != KD_TEXT ||
2774                     registered_fb[con2fb_map[i]] != info)
2775                         continue;
2776
2777                 p = &fb_display[vc->vc_num];
2778                 set_blitting_type(vc, info);
2779                 var_to_display(p, &info->var, info);
2780                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2781                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2782                 cols /= vc->vc_font.width;
2783                 rows /= vc->vc_font.height;
2784                 vc_resize(vc, cols, rows);
2785
2786                 if (CON_IS_VISIBLE(vc)) {
2787                         updatescrollmode(p, info, vc);
2788                         scrollback_max = 0;
2789                         scrollback_current = 0;
2790
2791                         if (!fbcon_is_inactive(vc, info)) {
2792                             ops->var.xoffset = ops->var.yoffset =
2793                                 p->yscroll = 0;
2794                             ops->update_start(info);
2795                         }
2796
2797                         fbcon_set_palette(vc, color_table);
2798                         update_screen(vc);
2799                         if (softback_buf)
2800                                 fbcon_update_softback(vc);
2801                 }
2802         }
2803
2804         ops->p = &fb_display[ops->currcon];
2805 }
2806
2807 static int fbcon_mode_deleted(struct fb_info *info,
2808                               struct fb_videomode *mode)
2809 {
2810         struct fb_info *fb_info;
2811         struct display *p;
2812         int i, j, found = 0;
2813
2814         /* before deletion, ensure that mode is not in use */
2815         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2816                 j = con2fb_map[i];
2817                 if (j == -1)
2818                         continue;
2819                 fb_info = registered_fb[j];
2820                 if (fb_info != info)
2821                         continue;
2822                 p = &fb_display[i];
2823                 if (!p || !p->mode)
2824                         continue;
2825                 if (fb_mode_is_equal(p->mode, mode)) {
2826                         found = 1;
2827                         break;
2828                 }
2829         }
2830         return found;
2831 }
2832
2833 static int fbcon_fb_registered(int idx)
2834 {
2835         int ret = 0, i;
2836
2837         if (info_idx == -1) {
2838                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2839                         if (con2fb_map_boot[i] == idx) {
2840                                 info_idx = idx;
2841                                 break;
2842                         }
2843                 }
2844                 if (info_idx != -1)
2845                         ret = fbcon_takeover(1);
2846         } else {
2847                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2848                         if (con2fb_map_boot[i] == idx)
2849                                 set_con2fb_map(i, idx, 0);
2850                 }
2851         }
2852
2853         return ret;
2854 }
2855
2856 static void fbcon_fb_blanked(struct fb_info *info, int blank)
2857 {
2858         struct fbcon_ops *ops = info->fbcon_par;
2859         struct vc_data *vc;
2860
2861         if (!ops || ops->currcon < 0)
2862                 return;
2863
2864         vc = vc_cons[ops->currcon].d;
2865         if (vc->vc_mode != KD_TEXT ||
2866                         registered_fb[con2fb_map[ops->currcon]] != info)
2867                 return;
2868
2869         if (CON_IS_VISIBLE(vc)) {
2870                 if (blank)
2871                         do_blank_screen(0);
2872                 else
2873                         do_unblank_screen(0);
2874         }
2875         ops->blank_state = blank;
2876 }
2877
2878 static void fbcon_new_modelist(struct fb_info *info)
2879 {
2880         int i;
2881         struct vc_data *vc;
2882         struct fb_var_screeninfo var;
2883         struct fb_videomode *mode;
2884
2885         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2886                 if (registered_fb[con2fb_map[i]] != info)
2887                         continue;
2888                 if (!fb_display[i].mode)
2889                         continue;
2890                 vc = vc_cons[i].d;
2891                 display_to_var(&var, &fb_display[i]);
2892                 mode = fb_find_nearest_mode(fb_display[i].mode,
2893                                             &info->modelist);
2894                 fb_videomode_to_var(&var, mode);
2895
2896                 if (vc)
2897                         fbcon_set_disp(info, &var, vc);
2898                 else
2899                         fbcon_preset_disp(info, &var, i);
2900
2901         }
2902 }
2903
2904 static int fbcon_event_notify(struct notifier_block *self, 
2905                               unsigned long action, void *data)
2906 {
2907         struct fb_event *event = data;
2908         struct fb_info *info = event->info;
2909         struct fb_videomode *mode;
2910         struct fb_con2fbmap *con2fb;
2911         int ret = 0;
2912
2913         switch(action) {
2914         case FB_EVENT_SUSPEND:
2915                 fbcon_suspended(info);
2916                 break;
2917         case FB_EVENT_RESUME:
2918                 fbcon_resumed(info);
2919                 break;
2920         case FB_EVENT_MODE_CHANGE:
2921                 fbcon_modechanged(info);
2922                 break;
2923         case FB_EVENT_MODE_CHANGE_ALL:
2924                 fbcon_set_all_vcs(info);
2925                 break;
2926         case FB_EVENT_MODE_DELETE:
2927                 mode = event->data;
2928                 ret = fbcon_mode_deleted(info, mode);
2929                 break;
2930         case FB_EVENT_FB_REGISTERED:
2931                 ret = fbcon_fb_registered(info->node);
2932                 break;
2933         case FB_EVENT_SET_CONSOLE_MAP:
2934                 con2fb = event->data;
2935                 ret = set_con2fb_map(con2fb->console - 1,
2936                                      con2fb->framebuffer, 1);
2937                 break;
2938         case FB_EVENT_GET_CONSOLE_MAP:
2939                 con2fb = event->data;
2940                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
2941                 break;
2942         case FB_EVENT_BLANK:
2943                 fbcon_fb_blanked(info, *(int *)event->data);
2944                 break;
2945         case FB_EVENT_NEW_MODELIST:
2946                 fbcon_new_modelist(info);
2947                 break;
2948         case FB_EVENT_SET_CON_ROTATE:
2949                 fbcon_rotate(info, *(int *)event->data);
2950                 break;
2951         case FB_EVENT_GET_CON_ROTATE:
2952                 ret = fbcon_get_rotate(info);
2953                 break;
2954         case FB_EVENT_SET_CON_ROTATE_ALL:
2955                 fbcon_rotate_all(info, *(int *)event->data);
2956         }
2957
2958         return ret;
2959 }
2960
2961 /*
2962  *  The console `switch' structure for the frame buffer based console
2963  */
2964
2965 static const struct consw fb_con = {
2966         .owner                  = THIS_MODULE,
2967         .con_startup            = fbcon_startup,
2968         .con_init               = fbcon_init,
2969         .con_deinit             = fbcon_deinit,
2970         .con_clear              = fbcon_clear,
2971         .con_putc               = fbcon_putc,
2972         .con_putcs              = fbcon_putcs,
2973         .con_cursor             = fbcon_cursor,
2974         .con_scroll             = fbcon_scroll,
2975         .con_bmove              = fbcon_bmove,
2976         .con_switch             = fbcon_switch,
2977         .con_blank              = fbcon_blank,
2978         .con_font_set           = fbcon_set_font,
2979         .con_font_get           = fbcon_get_font,
2980         .con_font_default       = fbcon_set_def_font,
2981         .con_font_copy          = fbcon_copy_font,
2982         .con_set_palette        = fbcon_set_palette,
2983         .con_scrolldelta        = fbcon_scrolldelta,
2984         .con_set_origin         = fbcon_set_origin,
2985         .con_invert_region      = fbcon_invert_region,
2986         .con_screen_pos         = fbcon_screen_pos,
2987         .con_getxy              = fbcon_getxy,
2988         .con_resize             = fbcon_resize,
2989 };
2990
2991 static struct notifier_block fbcon_event_notifier = {
2992         .notifier_call  = fbcon_event_notify,
2993 };
2994
2995 static int __init fb_console_init(void)
2996 {
2997         int i;
2998
2999         acquire_console_sem();
3000         fb_register_client(&fbcon_event_notifier);
3001         release_console_sem();
3002
3003         for (i = 0; i < MAX_NR_CONSOLES; i++)
3004                 con2fb_map[i] = -1;
3005
3006         if (num_registered_fb) {
3007                 for (i = 0; i < FB_MAX; i++) {
3008                         if (registered_fb[i] != NULL) {
3009                                 info_idx = i;
3010                                 break;
3011                         }
3012                 }
3013                 fbcon_takeover(0);
3014         }
3015
3016         return 0;
3017 }
3018
3019 module_init(fb_console_init);
3020
3021 #ifdef MODULE
3022
3023 static void __exit fb_console_exit(void)
3024 {
3025         acquire_console_sem();
3026         fb_unregister_client(&fbcon_event_notifier);
3027         release_console_sem();
3028         give_up_console(&fb_con);
3029 }       
3030
3031 module_exit(fb_console_exit);
3032
3033 #endif
3034
3035 MODULE_LICENSE("GPL");