8068d2f7efe69a2f8e93304b13b30f23d481d265
[linux-2.6.git] / 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, struct display *p)
213 {
214         struct fbcon_ops *ops = info->fbcon_par;
215
216         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
217             p->con_rotate < 4)
218                 ops->rotate = 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, struct display *p)
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, p, 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 0;
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 0;
485                                 options++;
486                         } else
487                                 return 0;
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 0;
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 0;
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                               struct display *p)
652 {
653         struct fbcon_ops *ops = info->fbcon_par;
654
655         ops->p = (p) ? p : &fb_display[vc->vc_num];
656
657         if ((info->flags & FBINFO_MISC_TILEBLITTING))
658                 fbcon_set_tileops(vc, info, p, ops);
659         else {
660                 fbcon_set_rotation(info, ops->p);
661                 fbcon_set_bitops(ops);
662         }
663 }
664 #else
665 static void set_blitting_type(struct vc_data *vc, struct fb_info *info,
666                               struct display *p)
667 {
668         struct fbcon_ops *ops = info->fbcon_par;
669
670         info->flags &= ~FBINFO_MISC_TILEBLITTING;
671         ops->p = (p) ? p : &fb_display[vc->vc_num];
672         fbcon_set_rotation(info, ops->p);
673         fbcon_set_bitops(ops);
674 }
675 #endif /* CONFIG_MISC_TILEBLITTING */
676
677
678 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
679                                   int unit, int oldidx)
680 {
681         struct fbcon_ops *ops = NULL;
682         int err = 0;
683
684         if (!try_module_get(info->fbops->owner))
685                 err = -ENODEV;
686
687         if (!err && info->fbops->fb_open &&
688             info->fbops->fb_open(info, 0))
689                 err = -ENODEV;
690
691         if (!err) {
692                 ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
693                 if (!ops)
694                         err = -ENOMEM;
695         }
696
697         if (!err) {
698                 memset(ops, 0, sizeof(struct fbcon_ops));
699                 info->fbcon_par = ops;
700                 set_blitting_type(vc, info, NULL);
701         }
702
703         if (err) {
704                 con2fb_map[unit] = oldidx;
705                 module_put(info->fbops->owner);
706         }
707
708         return err;
709 }
710
711 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
712                                   struct fb_info *newinfo, int unit,
713                                   int oldidx, int found)
714 {
715         struct fbcon_ops *ops = oldinfo->fbcon_par;
716         int err = 0;
717
718         if (oldinfo->fbops->fb_release &&
719             oldinfo->fbops->fb_release(oldinfo, 0)) {
720                 con2fb_map[unit] = oldidx;
721                 if (!found && newinfo->fbops->fb_release)
722                         newinfo->fbops->fb_release(newinfo, 0);
723                 if (!found)
724                         module_put(newinfo->fbops->owner);
725                 err = -ENODEV;
726         }
727
728         if (!err) {
729                 fbcon_del_cursor_timer(oldinfo);
730                 kfree(ops->cursor_state.mask);
731                 kfree(ops->cursor_data);
732                 kfree(ops->fontbuffer);
733                 kfree(oldinfo->fbcon_par);
734                 oldinfo->fbcon_par = NULL;
735                 module_put(oldinfo->fbops->owner);
736                 /*
737                   If oldinfo and newinfo are driving the same hardware,
738                   the fb_release() method of oldinfo may attempt to
739                   restore the hardware state.  This will leave the
740                   newinfo in an undefined state. Thus, a call to
741                   fb_set_par() may be needed for the newinfo.
742                 */
743                 if (newinfo->fbops->fb_set_par)
744                         newinfo->fbops->fb_set_par(newinfo);
745         }
746
747         return err;
748 }
749
750 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
751                                 int unit, int show_logo)
752 {
753         struct fbcon_ops *ops = info->fbcon_par;
754
755         ops->currcon = fg_console;
756
757         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT))
758                 info->fbops->fb_set_par(info);
759
760         ops->flags |= FBCON_FLAGS_INIT;
761         ops->graphics = 0;
762
763         if (vc)
764                 fbcon_set_disp(info, &info->var, vc);
765         else
766                 fbcon_preset_disp(info, &info->var, unit);
767
768         if (show_logo) {
769                 struct vc_data *fg_vc = vc_cons[fg_console].d;
770                 struct fb_info *fg_info =
771                         registered_fb[con2fb_map[fg_console]];
772
773                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
774                                    fg_vc->vc_rows, fg_vc->vc_cols,
775                                    fg_vc->vc_rows);
776         }
777
778         update_screen(vc_cons[fg_console].d);
779 }
780
781 /**
782  *      set_con2fb_map - map console to frame buffer device
783  *      @unit: virtual console number to map
784  *      @newidx: frame buffer index to map virtual console to
785  *      @user: user request
786  *
787  *      Maps a virtual console @unit to a frame buffer device
788  *      @newidx.
789  */
790 static int set_con2fb_map(int unit, int newidx, int user)
791 {
792         struct vc_data *vc = vc_cons[unit].d;
793         int oldidx = con2fb_map[unit];
794         struct fb_info *info = registered_fb[newidx];
795         struct fb_info *oldinfo = NULL;
796         int found, err = 0;
797
798         if (oldidx == newidx)
799                 return 0;
800
801         if (!info)
802                 err =  -EINVAL;
803
804         if (!err && !search_for_mapped_con()) {
805                 info_idx = newidx;
806                 return fbcon_takeover(0);
807         }
808
809         if (oldidx != -1)
810                 oldinfo = registered_fb[oldidx];
811
812         found = search_fb_in_map(newidx);
813
814         acquire_console_sem();
815         con2fb_map[unit] = newidx;
816         if (!err && !found)
817                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
818
819
820         /*
821          * If old fb is not mapped to any of the consoles,
822          * fbcon should release it.
823          */
824         if (!err && oldinfo && !search_fb_in_map(oldidx))
825                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
826                                              found);
827
828         if (!err) {
829                 int show_logo = (fg_console == 0 && !user &&
830                                  logo_shown != FBCON_LOGO_DONTSHOW);
831
832                 if (!found)
833                         fbcon_add_cursor_timer(info);
834                 con2fb_map_boot[unit] = newidx;
835                 con2fb_init_display(vc, info, unit, show_logo);
836         }
837
838         release_console_sem();
839         return err;
840 }
841
842 /*
843  *  Low Level Operations
844  */
845 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
846 static int var_to_display(struct display *disp,
847                           struct fb_var_screeninfo *var,
848                           struct fb_info *info)
849 {
850         disp->xres_virtual = var->xres_virtual;
851         disp->yres_virtual = var->yres_virtual;
852         disp->bits_per_pixel = var->bits_per_pixel;
853         disp->grayscale = var->grayscale;
854         disp->nonstd = var->nonstd;
855         disp->accel_flags = var->accel_flags;
856         disp->height = var->height;
857         disp->width = var->width;
858         disp->red = var->red;
859         disp->green = var->green;
860         disp->blue = var->blue;
861         disp->transp = var->transp;
862         disp->rotate = var->rotate;
863         disp->mode = fb_match_mode(var, &info->modelist);
864         if (disp->mode == NULL)
865                 /* This should not happen */
866                 return -EINVAL;
867         return 0;
868 }
869
870 static void display_to_var(struct fb_var_screeninfo *var,
871                            struct display *disp)
872 {
873         fb_videomode_to_var(var, disp->mode);
874         var->xres_virtual = disp->xres_virtual;
875         var->yres_virtual = disp->yres_virtual;
876         var->bits_per_pixel = disp->bits_per_pixel;
877         var->grayscale = disp->grayscale;
878         var->nonstd = disp->nonstd;
879         var->accel_flags = disp->accel_flags;
880         var->height = disp->height;
881         var->width = disp->width;
882         var->red = disp->red;
883         var->green = disp->green;
884         var->blue = disp->blue;
885         var->transp = disp->transp;
886         var->rotate = disp->rotate;
887 }
888
889 static const char *fbcon_startup(void)
890 {
891         const char *display_desc = "frame buffer device";
892         struct display *p = &fb_display[fg_console];
893         struct vc_data *vc = vc_cons[fg_console].d;
894         const struct font_desc *font = NULL;
895         struct module *owner;
896         struct fb_info *info = NULL;
897         struct fbcon_ops *ops;
898         int rows, cols;
899         int irqres;
900
901         irqres = 1;
902         /*
903          *  If num_registered_fb is zero, this is a call for the dummy part.
904          *  The frame buffer devices weren't initialized yet.
905          */
906         if (!num_registered_fb || info_idx == -1)
907                 return display_desc;
908         /*
909          * Instead of blindly using registered_fb[0], we use info_idx, set by
910          * fb_console_init();
911          */
912         info = registered_fb[info_idx];
913         if (!info)
914                 return NULL;
915         
916         owner = info->fbops->owner;
917         if (!try_module_get(owner))
918                 return NULL;
919         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
920                 module_put(owner);
921                 return NULL;
922         }
923
924         ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
925         if (!ops) {
926                 module_put(owner);
927                 return NULL;
928         }
929
930         memset(ops, 0, sizeof(struct fbcon_ops));
931         ops->currcon = -1;
932         ops->graphics = 1;
933         ops->cur_rotate = -1;
934         info->fbcon_par = ops;
935         p->con_rotate = rotate;
936         set_blitting_type(vc, info, NULL);
937
938         if (info->fix.type != FB_TYPE_TEXT) {
939                 if (fbcon_softback_size) {
940                         if (!softback_buf) {
941                                 softback_buf =
942                                     (unsigned long)
943                                     kmalloc(fbcon_softback_size,
944                                             GFP_KERNEL);
945                                 if (!softback_buf) {
946                                         fbcon_softback_size = 0;
947                                         softback_top = 0;
948                                 }
949                         }
950                 } else {
951                         if (softback_buf) {
952                                 kfree((void *) softback_buf);
953                                 softback_buf = 0;
954                                 softback_top = 0;
955                         }
956                 }
957                 if (softback_buf)
958                         softback_in = softback_top = softback_curr =
959                             softback_buf;
960                 softback_lines = 0;
961         }
962
963         /* Setup default font */
964         if (!p->fontdata) {
965                 if (!fontname[0] || !(font = find_font(fontname)))
966                         font = get_default_font(info->var.xres,
967                                                 info->var.yres);
968                 vc->vc_font.width = font->width;
969                 vc->vc_font.height = font->height;
970                 vc->vc_font.data = (void *)(p->fontdata = font->data);
971                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
972         }
973
974         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
975         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
976         cols /= vc->vc_font.width;
977         rows /= vc->vc_font.height;
978         vc_resize(vc, cols, rows);
979
980         DPRINTK("mode:   %s\n", info->fix.id);
981         DPRINTK("visual: %d\n", info->fix.visual);
982         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
983                 info->var.yres,
984                 info->var.bits_per_pixel);
985
986 #ifdef CONFIG_ATARI
987         if (MACH_IS_ATARI) {
988                 cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
989                 irqres =
990                     request_irq(IRQ_AUTO_4, fb_vbl_handler,
991                                 IRQ_TYPE_PRIO, "framebuffer vbl",
992                                 info);
993         }
994 #endif                          /* CONFIG_ATARI */
995
996 #ifdef CONFIG_MAC
997         /*
998          * On a Macintoy, the VBL interrupt may or may not be active. 
999          * As interrupt based cursor is more reliable and race free, we 
1000          * probe for VBL interrupts.
1001          */
1002         if (MACH_IS_MAC) {
1003                 int ct = 0;
1004                 /*
1005                  * Probe for VBL: set temp. handler ...
1006                  */
1007                 irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
1008                                      "framebuffer vbl", info);
1009                 vbl_detected = 0;
1010
1011                 /*
1012                  * ... and spin for 20 ms ...
1013                  */
1014                 while (!vbl_detected && ++ct < 1000)
1015                         udelay(20);
1016
1017                 if (ct == 1000)
1018                         printk
1019                             ("fbcon_startup: No VBL detected, using timer based cursor.\n");
1020
1021                 free_irq(IRQ_MAC_VBL, fb_vbl_detect);
1022
1023                 if (vbl_detected) {
1024                         /*
1025                          * interrupt based cursor ok
1026                          */
1027                         cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
1028                         irqres =
1029                             request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
1030                                         "framebuffer vbl", info);
1031                 } else {
1032                         /*
1033                          * VBL not detected: fall through, use timer based cursor
1034                          */
1035                         irqres = 1;
1036                 }
1037         }
1038 #endif                          /* CONFIG_MAC */
1039
1040         fbcon_add_cursor_timer(info);
1041         return display_desc;
1042 }
1043
1044 static void fbcon_init(struct vc_data *vc, int init)
1045 {
1046         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1047         struct fbcon_ops *ops;
1048         struct vc_data **default_mode = vc->vc_display_fg;
1049         struct vc_data *svc = *default_mode;
1050         struct display *t, *p = &fb_display[vc->vc_num];
1051         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1052         int cap;
1053
1054         if (info_idx == -1 || info == NULL)
1055             return;
1056
1057         cap = info->flags;
1058
1059         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1060             (info->fix.type == FB_TYPE_TEXT))
1061                 logo = 0;
1062
1063         if (var_to_display(p, &info->var, info))
1064                 return;
1065
1066         /* If we are not the first console on this
1067            fb, copy the font from that console */
1068         t = &fb_display[svc->vc_num];
1069         if (!vc->vc_font.data) {
1070                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1071                 vc->vc_font.width = (*default_mode)->vc_font.width;
1072                 vc->vc_font.height = (*default_mode)->vc_font.height;
1073                 p->userfont = t->userfont;
1074                 if (p->userfont)
1075                         REFCOUNT(p->fontdata)++;
1076         }
1077         if (p->userfont)
1078                 charcnt = FNTCHARCNT(p->fontdata);
1079         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1080         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1081         if (charcnt == 256) {
1082                 vc->vc_hi_font_mask = 0;
1083         } else {
1084                 vc->vc_hi_font_mask = 0x100;
1085                 if (vc->vc_can_do_color)
1086                         vc->vc_complement_mask <<= 1;
1087         }
1088
1089         if (!*svc->vc_uni_pagedir_loc)
1090                 con_set_default_unimap(svc);
1091         if (!*vc->vc_uni_pagedir_loc)
1092                 con_copy_unimap(vc, svc);
1093
1094         ops = info->fbcon_par;
1095         p->con_rotate = rotate;
1096         set_blitting_type(vc, info, NULL);
1097
1098         cols = vc->vc_cols;
1099         rows = vc->vc_rows;
1100         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1101         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1102         new_cols /= vc->vc_font.width;
1103         new_rows /= vc->vc_font.height;
1104         vc_resize(vc, new_cols, new_rows);
1105
1106         /*
1107          * We must always set the mode. The mode of the previous console
1108          * driver could be in the same resolution but we are using different
1109          * hardware so we have to initialize the hardware.
1110          *
1111          * We need to do it in fbcon_init() to prevent screen corruption.
1112          */
1113         if (CON_IS_VISIBLE(vc)) {
1114                 if (info->fbops->fb_set_par &&
1115                     !(ops->flags & FBCON_FLAGS_INIT))
1116                         info->fbops->fb_set_par(info);
1117                 ops->flags |= FBCON_FLAGS_INIT;
1118         }
1119
1120         ops->graphics = 0;
1121
1122         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1123             !(cap & FBINFO_HWACCEL_DISABLED))
1124                 p->scrollmode = SCROLL_MOVE;
1125         else /* default to something safe */
1126                 p->scrollmode = SCROLL_REDRAW;
1127
1128         /*
1129          *  ++guenther: console.c:vc_allocate() relies on initializing
1130          *  vc_{cols,rows}, but we must not set those if we are only
1131          *  resizing the console.
1132          */
1133         if (!init) {
1134                 vc->vc_cols = new_cols;
1135                 vc->vc_rows = new_rows;
1136         }
1137
1138         if (logo)
1139                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1140
1141         if (vc == svc && softback_buf)
1142                 fbcon_update_softback(vc);
1143
1144         if (ops->rotate_font && ops->rotate_font(info, vc, p)) {
1145                 ops->rotate = FB_ROTATE_UR;
1146                 set_blitting_type(vc, info, p);
1147         }
1148
1149 }
1150
1151 static void fbcon_deinit(struct vc_data *vc)
1152 {
1153         struct display *p = &fb_display[vc->vc_num];
1154
1155         if (info_idx != -1)
1156             return;
1157         fbcon_free_font(p);
1158 }
1159
1160 /* ====================================================================== */
1161
1162 /*  fbcon_XXX routines - interface used by the world
1163  *
1164  *  This system is now divided into two levels because of complications
1165  *  caused by hardware scrolling. Top level functions:
1166  *
1167  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1168  *
1169  *  handles y values in range [0, scr_height-1] that correspond to real
1170  *  screen positions. y_wrap shift means that first line of bitmap may be
1171  *  anywhere on this display. These functions convert lineoffsets to
1172  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1173  *
1174  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1175  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1176  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1177  *
1178  *  WARNING:
1179  *
1180  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1181  *  Implies should only really hardware scroll in rows. Only reason for
1182  *  restriction is simplicity & efficiency at the moment.
1183  */
1184
1185 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1186                         int width)
1187 {
1188         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1189         struct fbcon_ops *ops = info->fbcon_par;
1190
1191         struct display *p = &fb_display[vc->vc_num];
1192         u_int y_break;
1193
1194         if (fbcon_is_inactive(vc, info))
1195                 return;
1196
1197         if (!height || !width)
1198                 return;
1199
1200         /* Split blits that cross physical y_wrap boundary */
1201
1202         y_break = p->vrows - p->yscroll;
1203         if (sy < y_break && sy + height - 1 >= y_break) {
1204                 u_int b = y_break - sy;
1205                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1206                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1207                                  width);
1208         } else
1209                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1210 }
1211
1212 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1213                         int count, int ypos, int xpos)
1214 {
1215         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1216         struct display *p = &fb_display[vc->vc_num];
1217         struct fbcon_ops *ops = info->fbcon_par;
1218
1219         if (!fbcon_is_inactive(vc, info))
1220                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1221                            get_color(vc, info, scr_readw(s), 1),
1222                            get_color(vc, info, scr_readw(s), 0));
1223 }
1224
1225 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1226 {
1227         unsigned short chr;
1228
1229         scr_writew(c, &chr);
1230         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1231 }
1232
1233 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1234 {
1235         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1236         struct fbcon_ops *ops = info->fbcon_par;
1237
1238         if (!fbcon_is_inactive(vc, info))
1239                 ops->clear_margins(vc, info, bottom_only);
1240 }
1241
1242 static void fbcon_cursor(struct vc_data *vc, int mode)
1243 {
1244         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1245         struct fbcon_ops *ops = info->fbcon_par;
1246         struct display *p = &fb_display[vc->vc_num];
1247         int y;
1248         int c = scr_readw((u16 *) vc->vc_pos);
1249
1250         if (fbcon_is_inactive(vc, info))
1251                 return;
1252
1253         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1254         if (mode & CM_SOFTBACK) {
1255                 mode &= ~CM_SOFTBACK;
1256                 y = softback_lines;
1257         } else {
1258                 if (softback_lines)
1259                         fbcon_set_origin(vc);
1260                 y = 0;
1261         }
1262
1263         ops->cursor(vc, info, p, mode, y, get_color(vc, info, c, 1),
1264                     get_color(vc, info, c, 0));
1265         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1266 }
1267
1268 static int scrollback_phys_max = 0;
1269 static int scrollback_max = 0;
1270 static int scrollback_current = 0;
1271
1272 /*
1273  * If no vc is existent yet, just set struct display
1274  */
1275 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1276                               int unit)
1277 {
1278         struct display *p = &fb_display[unit];
1279         struct display *t = &fb_display[fg_console];
1280
1281         if (var_to_display(p, var, info))
1282                 return;
1283
1284         p->fontdata = t->fontdata;
1285         p->userfont = t->userfont;
1286         if (p->userfont)
1287                 REFCOUNT(p->fontdata)++;
1288 }
1289
1290 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1291                            struct vc_data *vc)
1292 {
1293         struct display *p = &fb_display[vc->vc_num], *t;
1294         struct vc_data **default_mode = vc->vc_display_fg;
1295         struct vc_data *svc = *default_mode;
1296         struct fbcon_ops *ops = info->fbcon_par;
1297         int rows, cols, charcnt = 256;
1298
1299         if (var_to_display(p, var, info))
1300                 return;
1301         t = &fb_display[svc->vc_num];
1302         if (!vc->vc_font.data) {
1303                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1304                 vc->vc_font.width = (*default_mode)->vc_font.width;
1305                 vc->vc_font.height = (*default_mode)->vc_font.height;
1306                 p->userfont = t->userfont;
1307                 if (p->userfont)
1308                         REFCOUNT(p->fontdata)++;
1309         }
1310         if (p->userfont)
1311                 charcnt = FNTCHARCNT(p->fontdata);
1312
1313         var->activate = FB_ACTIVATE_NOW;
1314         info->var.activate = var->activate;
1315         var->yoffset = info->var.yoffset;
1316         var->xoffset = info->var.xoffset;
1317         fb_set_var(info, var);
1318         ops->var = info->var;
1319         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1320         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1321         if (charcnt == 256) {
1322                 vc->vc_hi_font_mask = 0;
1323         } else {
1324                 vc->vc_hi_font_mask = 0x100;
1325                 if (vc->vc_can_do_color)
1326                         vc->vc_complement_mask <<= 1;
1327         }
1328
1329         if (!*svc->vc_uni_pagedir_loc)
1330                 con_set_default_unimap(svc);
1331         if (!*vc->vc_uni_pagedir_loc)
1332                 con_copy_unimap(vc, svc);
1333
1334         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1335         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1336         cols /= vc->vc_font.width;
1337         rows /= vc->vc_font.height;
1338         vc_resize(vc, cols, rows);
1339
1340         if (CON_IS_VISIBLE(vc)) {
1341                 update_screen(vc);
1342                 if (softback_buf)
1343                         fbcon_update_softback(vc);
1344         }
1345 }
1346
1347 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1348 {
1349         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1350         struct fbcon_ops *ops = info->fbcon_par;
1351         struct display *p = &fb_display[vc->vc_num];
1352         
1353         p->yscroll += count;
1354         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1355                 p->yscroll -= p->vrows;
1356         ops->var.xoffset = 0;
1357         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1358         ops->var.vmode |= FB_VMODE_YWRAP;
1359         ops->update_start(info);
1360         scrollback_max += count;
1361         if (scrollback_max > scrollback_phys_max)
1362                 scrollback_max = scrollback_phys_max;
1363         scrollback_current = 0;
1364 }
1365
1366 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1367 {
1368         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1369         struct fbcon_ops *ops = info->fbcon_par;
1370         struct display *p = &fb_display[vc->vc_num];
1371         
1372         p->yscroll -= count;
1373         if (p->yscroll < 0)     /* Deal with wrap */
1374                 p->yscroll += p->vrows;
1375         ops->var.xoffset = 0;
1376         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1377         ops->var.vmode |= FB_VMODE_YWRAP;
1378         ops->update_start(info);
1379         scrollback_max -= count;
1380         if (scrollback_max < 0)
1381                 scrollback_max = 0;
1382         scrollback_current = 0;
1383 }
1384
1385 static __inline__ void ypan_up(struct vc_data *vc, int count)
1386 {
1387         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1388         struct display *p = &fb_display[vc->vc_num];
1389         struct fbcon_ops *ops = info->fbcon_par;
1390
1391         p->yscroll += count;
1392         if (p->yscroll > p->vrows - vc->vc_rows) {
1393                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1394                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1395                 p->yscroll -= p->vrows - vc->vc_rows;
1396         }
1397
1398         ops->var.xoffset = 0;
1399         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1400         ops->var.vmode &= ~FB_VMODE_YWRAP;
1401         ops->update_start(info);
1402         fbcon_clear_margins(vc, 1);
1403         scrollback_max += count;
1404         if (scrollback_max > scrollback_phys_max)
1405                 scrollback_max = scrollback_phys_max;
1406         scrollback_current = 0;
1407 }
1408
1409 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1410 {
1411         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1412         struct fbcon_ops *ops = info->fbcon_par;
1413         struct display *p = &fb_display[vc->vc_num];
1414         int redraw = 0;
1415
1416         p->yscroll += count;
1417         if (p->yscroll > p->vrows - vc->vc_rows) {
1418                 p->yscroll -= p->vrows - vc->vc_rows;
1419                 redraw = 1;
1420         }
1421
1422         if (redraw)
1423                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1424
1425         ops->var.xoffset = 0;
1426         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1427         ops->var.vmode &= ~FB_VMODE_YWRAP;
1428         ops->update_start(info);
1429         fbcon_clear_margins(vc, 1);
1430         scrollback_max += count;
1431         if (scrollback_max > scrollback_phys_max)
1432                 scrollback_max = scrollback_phys_max;
1433         scrollback_current = 0;
1434 }
1435
1436 static __inline__ void ypan_down(struct vc_data *vc, int count)
1437 {
1438         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1439         struct display *p = &fb_display[vc->vc_num];
1440         struct fbcon_ops *ops = info->fbcon_par;
1441         
1442         p->yscroll -= count;
1443         if (p->yscroll < 0) {
1444                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1445                             0, vc->vc_rows, vc->vc_cols);
1446                 p->yscroll += p->vrows - vc->vc_rows;
1447         }
1448
1449         ops->var.xoffset = 0;
1450         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1451         ops->var.vmode &= ~FB_VMODE_YWRAP;
1452         ops->update_start(info);
1453         fbcon_clear_margins(vc, 1);
1454         scrollback_max -= count;
1455         if (scrollback_max < 0)
1456                 scrollback_max = 0;
1457         scrollback_current = 0;
1458 }
1459
1460 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1461 {
1462         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1463         struct fbcon_ops *ops = info->fbcon_par;
1464         struct display *p = &fb_display[vc->vc_num];
1465         int redraw = 0;
1466
1467         p->yscroll -= count;
1468         if (p->yscroll < 0) {
1469                 p->yscroll += p->vrows - vc->vc_rows;
1470                 redraw = 1;
1471         }
1472
1473         if (redraw)
1474                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1475
1476         ops->var.xoffset = 0;
1477         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1478         ops->var.vmode &= ~FB_VMODE_YWRAP;
1479         ops->update_start(info);
1480         fbcon_clear_margins(vc, 1);
1481         scrollback_max -= count;
1482         if (scrollback_max < 0)
1483                 scrollback_max = 0;
1484         scrollback_current = 0;
1485 }
1486
1487 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1488                                   long delta)
1489 {
1490         int count = vc->vc_rows;
1491         unsigned short *d, *s;
1492         unsigned long n;
1493         int line = 0;
1494
1495         d = (u16 *) softback_curr;
1496         if (d == (u16 *) softback_in)
1497                 d = (u16 *) vc->vc_origin;
1498         n = softback_curr + delta * vc->vc_size_row;
1499         softback_lines -= delta;
1500         if (delta < 0) {
1501                 if (softback_curr < softback_top && n < softback_buf) {
1502                         n += softback_end - softback_buf;
1503                         if (n < softback_top) {
1504                                 softback_lines -=
1505                                     (softback_top - n) / vc->vc_size_row;
1506                                 n = softback_top;
1507                         }
1508                 } else if (softback_curr >= softback_top
1509                            && n < softback_top) {
1510                         softback_lines -=
1511                             (softback_top - n) / vc->vc_size_row;
1512                         n = softback_top;
1513                 }
1514         } else {
1515                 if (softback_curr > softback_in && n >= softback_end) {
1516                         n += softback_buf - softback_end;
1517                         if (n > softback_in) {
1518                                 n = softback_in;
1519                                 softback_lines = 0;
1520                         }
1521                 } else if (softback_curr <= softback_in && n > softback_in) {
1522                         n = softback_in;
1523                         softback_lines = 0;
1524                 }
1525         }
1526         if (n == softback_curr)
1527                 return;
1528         softback_curr = n;
1529         s = (u16 *) softback_curr;
1530         if (s == (u16 *) softback_in)
1531                 s = (u16 *) vc->vc_origin;
1532         while (count--) {
1533                 unsigned short *start;
1534                 unsigned short *le;
1535                 unsigned short c;
1536                 int x = 0;
1537                 unsigned short attr = 1;
1538
1539                 start = s;
1540                 le = advance_row(s, 1);
1541                 do {
1542                         c = scr_readw(s);
1543                         if (attr != (c & 0xff00)) {
1544                                 attr = c & 0xff00;
1545                                 if (s > start) {
1546                                         fbcon_putcs(vc, start, s - start,
1547                                                     line, x);
1548                                         x += s - start;
1549                                         start = s;
1550                                 }
1551                         }
1552                         if (c == scr_readw(d)) {
1553                                 if (s > start) {
1554                                         fbcon_putcs(vc, start, s - start,
1555                                                     line, x);
1556                                         x += s - start + 1;
1557                                         start = s + 1;
1558                                 } else {
1559                                         x++;
1560                                         start++;
1561                                 }
1562                         }
1563                         s++;
1564                         d++;
1565                 } while (s < le);
1566                 if (s > start)
1567                         fbcon_putcs(vc, start, s - start, line, x);
1568                 line++;
1569                 if (d == (u16 *) softback_end)
1570                         d = (u16 *) softback_buf;
1571                 if (d == (u16 *) softback_in)
1572                         d = (u16 *) vc->vc_origin;
1573                 if (s == (u16 *) softback_end)
1574                         s = (u16 *) softback_buf;
1575                 if (s == (u16 *) softback_in)
1576                         s = (u16 *) vc->vc_origin;
1577         }
1578 }
1579
1580 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1581                               int line, int count, int dy)
1582 {
1583         unsigned short *s = (unsigned short *)
1584                 (vc->vc_origin + vc->vc_size_row * line);
1585
1586         while (count--) {
1587                 unsigned short *start = s;
1588                 unsigned short *le = advance_row(s, 1);
1589                 unsigned short c;
1590                 int x = 0;
1591                 unsigned short attr = 1;
1592
1593                 do {
1594                         c = scr_readw(s);
1595                         if (attr != (c & 0xff00)) {
1596                                 attr = c & 0xff00;
1597                                 if (s > start) {
1598                                         fbcon_putcs(vc, start, s - start,
1599                                                     dy, x);
1600                                         x += s - start;
1601                                         start = s;
1602                                 }
1603                         }
1604                         console_conditional_schedule();
1605                         s++;
1606                 } while (s < le);
1607                 if (s > start)
1608                         fbcon_putcs(vc, start, s - start, dy, x);
1609                 console_conditional_schedule();
1610                 dy++;
1611         }
1612 }
1613
1614 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1615                          int line, int count, int offset)
1616 {
1617         unsigned short *d = (unsigned short *)
1618             (vc->vc_origin + vc->vc_size_row * line);
1619         unsigned short *s = d + offset;
1620
1621         while (count--) {
1622                 unsigned short *start = s;
1623                 unsigned short *le = advance_row(s, 1);
1624                 unsigned short c;
1625                 int x = 0;
1626                 unsigned short attr = 1;
1627
1628                 do {
1629                         c = scr_readw(s);
1630                         if (attr != (c & 0xff00)) {
1631                                 attr = c & 0xff00;
1632                                 if (s > start) {
1633                                         fbcon_putcs(vc, start, s - start,
1634                                                     line, x);
1635                                         x += s - start;
1636                                         start = s;
1637                                 }
1638                         }
1639                         if (c == scr_readw(d)) {
1640                                 if (s > start) {
1641                                         fbcon_putcs(vc, start, s - start,
1642                                                      line, x);
1643                                         x += s - start + 1;
1644                                         start = s + 1;
1645                                 } else {
1646                                         x++;
1647                                         start++;
1648                                 }
1649                         }
1650                         scr_writew(c, d);
1651                         console_conditional_schedule();
1652                         s++;
1653                         d++;
1654                 } while (s < le);
1655                 if (s > start)
1656                         fbcon_putcs(vc, start, s - start, line, x);
1657                 console_conditional_schedule();
1658                 if (offset > 0)
1659                         line++;
1660                 else {
1661                         line--;
1662                         /* NOTE: We subtract two lines from these pointers */
1663                         s -= vc->vc_size_row;
1664                         d -= vc->vc_size_row;
1665                 }
1666         }
1667 }
1668
1669 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1670                                        int count)
1671 {
1672         unsigned short *p;
1673
1674         if (vc->vc_num != fg_console)
1675                 return;
1676         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1677
1678         while (count) {
1679                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1680                 count--;
1681                 p = advance_row(p, 1);
1682                 softback_in += vc->vc_size_row;
1683                 if (softback_in == softback_end)
1684                         softback_in = softback_buf;
1685                 if (softback_in == softback_top) {
1686                         softback_top += vc->vc_size_row;
1687                         if (softback_top == softback_end)
1688                                 softback_top = softback_buf;
1689                 }
1690         }
1691         softback_curr = softback_in;
1692 }
1693
1694 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1695                         int count)
1696 {
1697         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1698         struct display *p = &fb_display[vc->vc_num];
1699         struct fbcon_ops *ops = info->fbcon_par;
1700         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1701
1702         if (fbcon_is_inactive(vc, info))
1703                 return -EINVAL;
1704
1705         fbcon_cursor(vc, CM_ERASE);
1706
1707         /*
1708          * ++Geert: Only use ywrap/ypan if the console is in text mode
1709          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1710          *           whole screen (prevents flicker).
1711          */
1712
1713         switch (dir) {
1714         case SM_UP:
1715                 if (count > vc->vc_rows)        /* Maximum realistic size */
1716                         count = vc->vc_rows;
1717                 if (softback_top)
1718                         fbcon_softback_note(vc, t, count);
1719                 if (logo_shown >= 0)
1720                         goto redraw_up;
1721                 switch (p->scrollmode) {
1722                 case SCROLL_MOVE:
1723                         ops->bmove(vc, info, t + count, 0, t, 0,
1724                                     b - t - count, vc->vc_cols);
1725                         ops->clear(vc, info, b - count, 0, count,
1726                                   vc->vc_cols);
1727                         break;
1728
1729                 case SCROLL_WRAP_MOVE:
1730                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1731                                 if (t > 0)
1732                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1733                                                     vc->vc_cols);
1734                                 ywrap_up(vc, count);
1735                                 if (vc->vc_rows - b > 0)
1736                                         fbcon_bmove(vc, b - count, 0, b, 0,
1737                                                     vc->vc_rows - b,
1738                                                     vc->vc_cols);
1739                         } else if (info->flags & FBINFO_READS_FAST)
1740                                 fbcon_bmove(vc, t + count, 0, t, 0,
1741                                             b - t - count, vc->vc_cols);
1742                         else
1743                                 goto redraw_up;
1744                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1745                         break;
1746
1747                 case SCROLL_PAN_REDRAW:
1748                         if ((p->yscroll + count <=
1749                              2 * (p->vrows - vc->vc_rows))
1750                             && ((!scroll_partial && (b - t == vc->vc_rows))
1751                                 || (scroll_partial
1752                                     && (b - t - count >
1753                                         3 * vc->vc_rows >> 2)))) {
1754                                 if (t > 0)
1755                                         fbcon_redraw_move(vc, p, 0, t, count);
1756                                 ypan_up_redraw(vc, t, count);
1757                                 if (vc->vc_rows - b > 0)
1758                                         fbcon_redraw_move(vc, p, b - count,
1759                                                           vc->vc_rows - b, b);
1760                         } else
1761                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1762                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1763                         break;
1764
1765                 case SCROLL_PAN_MOVE:
1766                         if ((p->yscroll + count <=
1767                              2 * (p->vrows - vc->vc_rows))
1768                             && ((!scroll_partial && (b - t == vc->vc_rows))
1769                                 || (scroll_partial
1770                                     && (b - t - count >
1771                                         3 * vc->vc_rows >> 2)))) {
1772                                 if (t > 0)
1773                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1774                                                     vc->vc_cols);
1775                                 ypan_up(vc, count);
1776                                 if (vc->vc_rows - b > 0)
1777                                         fbcon_bmove(vc, b - count, 0, b, 0,
1778                                                     vc->vc_rows - b,
1779                                                     vc->vc_cols);
1780                         } else if (info->flags & FBINFO_READS_FAST)
1781                                 fbcon_bmove(vc, t + count, 0, t, 0,
1782                                             b - t - count, vc->vc_cols);
1783                         else
1784                                 goto redraw_up;
1785                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1786                         break;
1787
1788                 case SCROLL_REDRAW:
1789                       redraw_up:
1790                         fbcon_redraw(vc, p, t, b - t - count,
1791                                      count * vc->vc_cols);
1792                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1793                         scr_memsetw((unsigned short *) (vc->vc_origin +
1794                                                         vc->vc_size_row *
1795                                                         (b - count)),
1796                                     vc->vc_video_erase_char,
1797                                     vc->vc_size_row * count);
1798                         return 1;
1799                 }
1800                 break;
1801
1802         case SM_DOWN:
1803                 if (count > vc->vc_rows)        /* Maximum realistic size */
1804                         count = vc->vc_rows;
1805                 if (logo_shown >= 0)
1806                         goto redraw_down;
1807                 switch (p->scrollmode) {
1808                 case SCROLL_MOVE:
1809                         ops->bmove(vc, info, t, 0, t + count, 0,
1810                                     b - t - count, vc->vc_cols);
1811                         ops->clear(vc, info, t, 0, count, vc->vc_cols);
1812                         break;
1813
1814                 case SCROLL_WRAP_MOVE:
1815                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1816                                 if (vc->vc_rows - b > 0)
1817                                         fbcon_bmove(vc, b, 0, b - count, 0,
1818                                                     vc->vc_rows - b,
1819                                                     vc->vc_cols);
1820                                 ywrap_down(vc, count);
1821                                 if (t > 0)
1822                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1823                                                     vc->vc_cols);
1824                         } else if (info->flags & FBINFO_READS_FAST)
1825                                 fbcon_bmove(vc, t, 0, t + count, 0,
1826                                             b - t - count, vc->vc_cols);
1827                         else
1828                                 goto redraw_down;
1829                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1830                         break;
1831
1832                 case SCROLL_PAN_MOVE:
1833                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1834                             && ((!scroll_partial && (b - t == vc->vc_rows))
1835                                 || (scroll_partial
1836                                     && (b - t - count >
1837                                         3 * vc->vc_rows >> 2)))) {
1838                                 if (vc->vc_rows - b > 0)
1839                                         fbcon_bmove(vc, b, 0, b - count, 0,
1840                                                     vc->vc_rows - b,
1841                                                     vc->vc_cols);
1842                                 ypan_down(vc, count);
1843                                 if (t > 0)
1844                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1845                                                     vc->vc_cols);
1846                         } else if (info->flags & FBINFO_READS_FAST)
1847                                 fbcon_bmove(vc, t, 0, t + count, 0,
1848                                             b - t - count, vc->vc_cols);
1849                         else
1850                                 goto redraw_down;
1851                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1852                         break;
1853
1854                 case SCROLL_PAN_REDRAW:
1855                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1856                             && ((!scroll_partial && (b - t == vc->vc_rows))
1857                                 || (scroll_partial
1858                                     && (b - t - count >
1859                                         3 * vc->vc_rows >> 2)))) {
1860                                 if (vc->vc_rows - b > 0)
1861                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1862                                                           b - count);
1863                                 ypan_down_redraw(vc, t, count);
1864                                 if (t > 0)
1865                                         fbcon_redraw_move(vc, p, count, t, 0);
1866                         } else
1867                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1868                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1869                         break;
1870
1871                 case SCROLL_REDRAW:
1872                       redraw_down:
1873                         fbcon_redraw(vc, p, b - 1, b - t - count,
1874                                      -count * vc->vc_cols);
1875                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1876                         scr_memsetw((unsigned short *) (vc->vc_origin +
1877                                                         vc->vc_size_row *
1878                                                         t),
1879                                     vc->vc_video_erase_char,
1880                                     vc->vc_size_row * count);
1881                         return 1;
1882                 }
1883         }
1884         return 0;
1885 }
1886
1887
1888 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1889                         int height, int width)
1890 {
1891         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1892         struct display *p = &fb_display[vc->vc_num];
1893         
1894         if (fbcon_is_inactive(vc, info))
1895                 return;
1896
1897         if (!width || !height)
1898                 return;
1899
1900         /*  Split blits that cross physical y_wrap case.
1901          *  Pathological case involves 4 blits, better to use recursive
1902          *  code rather than unrolled case
1903          *
1904          *  Recursive invocations don't need to erase the cursor over and
1905          *  over again, so we use fbcon_bmove_rec()
1906          */
1907         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1908                         p->vrows - p->yscroll);
1909 }
1910
1911 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx, 
1912                             int dy, int dx, int height, int width, u_int y_break)
1913 {
1914         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1915         struct fbcon_ops *ops = info->fbcon_par;
1916         u_int b;
1917
1918         if (sy < y_break && sy + height > y_break) {
1919                 b = y_break - sy;
1920                 if (dy < sy) {  /* Avoid trashing self */
1921                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1922                                         y_break);
1923                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1924                                         height - b, width, y_break);
1925                 } else {
1926                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1927                                         height - b, width, y_break);
1928                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1929                                         y_break);
1930                 }
1931                 return;
1932         }
1933
1934         if (dy < y_break && dy + height > y_break) {
1935                 b = y_break - dy;
1936                 if (dy < sy) {  /* Avoid trashing self */
1937                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1938                                         y_break);
1939                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1940                                         height - b, width, y_break);
1941                 } else {
1942                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1943                                         height - b, width, y_break);
1944                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1945                                         y_break);
1946                 }
1947                 return;
1948         }
1949         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1950                    height, width);
1951 }
1952
1953 static __inline__ void updatescrollmode(struct display *p,
1954                                         struct fb_info *info,
1955                                         struct vc_data *vc)
1956 {
1957         struct fbcon_ops *ops = info->fbcon_par;
1958         int fh = vc->vc_font.height;
1959         int cap = info->flags;
1960         u16 t = 0;
1961         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
1962                                   info->fix.xpanstep);
1963         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
1964         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1965         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1966                                    info->var.xres_virtual);
1967         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
1968                 divides(ypan, vc->vc_font.height) && vyres > yres;
1969         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
1970                 divides(ywrap, vc->vc_font.height) &&
1971                 divides(vc->vc_font.height, vyres);
1972         int reading_fast = cap & FBINFO_READS_FAST;
1973         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
1974                 !(cap & FBINFO_HWACCEL_DISABLED);
1975         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
1976                 !(cap & FBINFO_HWACCEL_DISABLED);
1977
1978         p->vrows = vyres/fh;
1979         if (yres > (fh * (vc->vc_rows + 1)))
1980                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
1981         if ((yres % fh) && (vyres % fh < yres % fh))
1982                 p->vrows--;
1983
1984         if (good_wrap || good_pan) {
1985                 if (reading_fast || fast_copyarea)
1986                         p->scrollmode = good_wrap ?
1987                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1988                 else
1989                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
1990                                 SCROLL_PAN_REDRAW;
1991         } else {
1992                 if (reading_fast || (fast_copyarea && !fast_imageblit))
1993                         p->scrollmode = SCROLL_MOVE;
1994                 else
1995                         p->scrollmode = SCROLL_REDRAW;
1996         }
1997 }
1998
1999 static int fbcon_resize(struct vc_data *vc, unsigned int width, 
2000                         unsigned int height)
2001 {
2002         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2003         struct fbcon_ops *ops = info->fbcon_par;
2004         struct display *p = &fb_display[vc->vc_num];
2005         struct fb_var_screeninfo var = info->var;
2006         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2007
2008         virt_w = FBCON_SWAP(ops->rotate, width, height);
2009         virt_h = FBCON_SWAP(ops->rotate, height, width);
2010         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2011                                  vc->vc_font.height);
2012         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2013                                  vc->vc_font.width);
2014         var.xres = virt_w * virt_fw;
2015         var.yres = virt_h * virt_fh;
2016         x_diff = info->var.xres - var.xres;
2017         y_diff = info->var.yres - var.yres;
2018         if (x_diff < 0 || x_diff > virt_fw ||
2019             y_diff < 0 || y_diff > virt_fh) {
2020                 struct fb_videomode *mode;
2021
2022                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2023                 mode = fb_find_best_mode(&var, &info->modelist);
2024                 if (mode == NULL)
2025                         return -EINVAL;
2026                 display_to_var(&var, p);
2027                 fb_videomode_to_var(&var, mode);
2028
2029                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2030                         return -EINVAL;
2031
2032                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2033                 if (CON_IS_VISIBLE(vc)) {
2034                         var.activate = FB_ACTIVATE_NOW |
2035                                 FB_ACTIVATE_FORCE;
2036                         fb_set_var(info, &var);
2037                 }
2038                 var_to_display(p, &info->var, info);
2039                 ops->var = info->var;
2040         }
2041         updatescrollmode(p, info, vc);
2042         return 0;
2043 }
2044
2045 static int fbcon_switch(struct vc_data *vc)
2046 {
2047         struct fb_info *info, *old_info = NULL;
2048         struct fbcon_ops *ops;
2049         struct display *p = &fb_display[vc->vc_num];
2050         struct fb_var_screeninfo var;
2051         int i, prev_console, charcnt = 256;
2052
2053         info = registered_fb[con2fb_map[vc->vc_num]];
2054         ops = info->fbcon_par;
2055
2056         if (softback_top) {
2057                 if (softback_lines)
2058                         fbcon_set_origin(vc);
2059                 softback_top = softback_curr = softback_in = softback_buf;
2060                 softback_lines = 0;
2061                 fbcon_update_softback(vc);
2062         }
2063
2064         if (logo_shown >= 0) {
2065                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2066
2067                 if (conp2->vc_top == logo_lines
2068                     && conp2->vc_bottom == conp2->vc_rows)
2069                         conp2->vc_top = 0;
2070                 logo_shown = FBCON_LOGO_CANSHOW;
2071         }
2072
2073         prev_console = ops->currcon;
2074         if (prev_console != -1)
2075                 old_info = registered_fb[con2fb_map[prev_console]];
2076         /*
2077          * FIXME: If we have multiple fbdev's loaded, we need to
2078          * update all info->currcon.  Perhaps, we can place this
2079          * in a centralized structure, but this might break some
2080          * drivers.
2081          *
2082          * info->currcon = vc->vc_num;
2083          */
2084         for (i = 0; i < FB_MAX; i++) {
2085                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2086                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2087
2088                         o->currcon = vc->vc_num;
2089                 }
2090         }
2091         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2092         display_to_var(&var, p);
2093         var.activate = FB_ACTIVATE_NOW;
2094
2095         /*
2096          * make sure we don't unnecessarily trip the memcmp()
2097          * in fb_set_var()
2098          */
2099         info->var.activate = var.activate;
2100         var.yoffset = info->var.yoffset;
2101         var.xoffset = info->var.xoffset;
2102         var.vmode = info->var.vmode;
2103         fb_set_var(info, &var);
2104         ops->var = info->var;
2105
2106         if (old_info != NULL && old_info != info) {
2107                 if (info->fbops->fb_set_par)
2108                         info->fbops->fb_set_par(info);
2109                 fbcon_del_cursor_timer(old_info);
2110                 fbcon_add_cursor_timer(info);
2111         }
2112
2113         set_blitting_type(vc, info, p);
2114         ops->cursor_reset = 1;
2115
2116         if (ops->rotate_font && ops->rotate_font(info, vc, p)) {
2117                 ops->rotate = FB_ROTATE_UR;
2118                 set_blitting_type(vc, info, p);
2119         }
2120
2121         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2122         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2123
2124         if (p->userfont)
2125                 charcnt = FNTCHARCNT(vc->vc_font.data);
2126
2127         if (charcnt > 256)
2128                 vc->vc_complement_mask <<= 1;
2129
2130         updatescrollmode(p, info, vc);
2131
2132         switch (p->scrollmode) {
2133         case SCROLL_WRAP_MOVE:
2134                 scrollback_phys_max = p->vrows - vc->vc_rows;
2135                 break;
2136         case SCROLL_PAN_MOVE:
2137         case SCROLL_PAN_REDRAW:
2138                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2139                 if (scrollback_phys_max < 0)
2140                         scrollback_phys_max = 0;
2141                 break;
2142         default:
2143                 scrollback_phys_max = 0;
2144                 break;
2145         }
2146
2147         scrollback_max = 0;
2148         scrollback_current = 0;
2149
2150         if (!fbcon_is_inactive(vc, info)) {
2151             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2152             ops->update_start(info);
2153         }
2154
2155         fbcon_set_palette(vc, color_table);     
2156         fbcon_clear_margins(vc, 0);
2157
2158         if (logo_shown == FBCON_LOGO_DRAW) {
2159
2160                 logo_shown = fg_console;
2161                 /* This is protected above by initmem_freed */
2162                 fb_show_logo(info, ops->rotate);
2163                 update_region(vc,
2164                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2165                               vc->vc_size_row * (vc->vc_bottom -
2166                                                  vc->vc_top) / 2);
2167                 return 0;
2168         }
2169         return 1;
2170 }
2171
2172 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2173                                 int blank)
2174 {
2175         if (blank) {
2176                 unsigned short charmask = vc->vc_hi_font_mask ?
2177                         0x1ff : 0xff;
2178                 unsigned short oldc;
2179
2180                 oldc = vc->vc_video_erase_char;
2181                 vc->vc_video_erase_char &= charmask;
2182                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2183                 vc->vc_video_erase_char = oldc;
2184         }
2185 }
2186
2187 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2188 {
2189         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2190         struct fbcon_ops *ops = info->fbcon_par;
2191
2192         if (mode_switch) {
2193                 struct fb_var_screeninfo var = info->var;
2194
2195                 ops->graphics = 1;
2196
2197                 if (!blank) {
2198                         if (info->fbops->fb_save_state)
2199                                 info->fbops->fb_save_state(info);
2200                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2201                         fb_set_var(info, &var);
2202                         ops->graphics = 0;
2203                         ops->var = info->var;
2204                 } else if (info->fbops->fb_restore_state)
2205                         info->fbops->fb_restore_state(info);
2206         }
2207
2208         if (!fbcon_is_inactive(vc, info)) {
2209                 if (ops->blank_state != blank) {
2210                         ops->blank_state = blank;
2211                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2212                         ops->cursor_flash = (!blank);
2213
2214                         if (fb_blank(info, blank))
2215                                 fbcon_generic_blank(vc, info, blank);
2216                 }
2217
2218                 if (!blank)
2219                         update_screen(vc);
2220         }
2221
2222         if (!blank)
2223                 fbcon_add_cursor_timer(info);
2224         else
2225                 fbcon_del_cursor_timer(info);
2226
2227         return 0;
2228 }
2229
2230 static void fbcon_free_font(struct display *p)
2231 {
2232         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
2233                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
2234         p->fontdata = NULL;
2235         p->userfont = 0;
2236 }
2237
2238 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2239 {
2240         u8 *fontdata = vc->vc_font.data;
2241         u8 *data = font->data;
2242         int i, j;
2243
2244         font->width = vc->vc_font.width;
2245         font->height = vc->vc_font.height;
2246         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2247         if (!font->data)
2248                 return 0;
2249
2250         if (font->width <= 8) {
2251                 j = vc->vc_font.height;
2252                 for (i = 0; i < font->charcount; i++) {
2253                         memcpy(data, fontdata, j);
2254                         memset(data + j, 0, 32 - j);
2255                         data += 32;
2256                         fontdata += j;
2257                 }
2258         } else if (font->width <= 16) {
2259                 j = vc->vc_font.height * 2;
2260                 for (i = 0; i < font->charcount; i++) {
2261                         memcpy(data, fontdata, j);
2262                         memset(data + j, 0, 64 - j);
2263                         data += 64;
2264                         fontdata += j;
2265                 }
2266         } else if (font->width <= 24) {
2267                 for (i = 0; i < font->charcount; i++) {
2268                         for (j = 0; j < vc->vc_font.height; j++) {
2269                                 *data++ = fontdata[0];
2270                                 *data++ = fontdata[1];
2271                                 *data++ = fontdata[2];
2272                                 fontdata += sizeof(u32);
2273                         }
2274                         memset(data, 0, 3 * (32 - j));
2275                         data += 3 * (32 - j);
2276                 }
2277         } else {
2278                 j = vc->vc_font.height * 4;
2279                 for (i = 0; i < font->charcount; i++) {
2280                         memcpy(data, fontdata, j);
2281                         memset(data + j, 0, 128 - j);
2282                         data += 128;
2283                         fontdata += j;
2284                 }
2285         }
2286         return 0;
2287 }
2288
2289 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2290                              const u8 * data, int userfont)
2291 {
2292         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2293         struct fbcon_ops *ops = info->fbcon_par;
2294         struct display *p = &fb_display[vc->vc_num];
2295         int resize;
2296         int cnt;
2297         char *old_data = NULL;
2298
2299         if (CON_IS_VISIBLE(vc) && softback_lines)
2300                 fbcon_set_origin(vc);
2301
2302         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2303         if (p->userfont)
2304                 old_data = vc->vc_font.data;
2305         if (userfont)
2306                 cnt = FNTCHARCNT(data);
2307         else
2308                 cnt = 256;
2309         vc->vc_font.data = (void *)(p->fontdata = data);
2310         if ((p->userfont = userfont))
2311                 REFCOUNT(data)++;
2312         vc->vc_font.width = w;
2313         vc->vc_font.height = h;
2314         if (vc->vc_hi_font_mask && cnt == 256) {
2315                 vc->vc_hi_font_mask = 0;
2316                 if (vc->vc_can_do_color) {
2317                         vc->vc_complement_mask >>= 1;
2318                         vc->vc_s_complement_mask >>= 1;
2319                 }
2320                         
2321                 /* ++Edmund: reorder the attribute bits */
2322                 if (vc->vc_can_do_color) {
2323                         unsigned short *cp =
2324                             (unsigned short *) vc->vc_origin;
2325                         int count = vc->vc_screenbuf_size / 2;
2326                         unsigned short c;
2327                         for (; count > 0; count--, cp++) {
2328                                 c = scr_readw(cp);
2329                                 scr_writew(((c & 0xfe00) >> 1) |
2330                                            (c & 0xff), cp);
2331                         }
2332                         c = vc->vc_video_erase_char;
2333                         vc->vc_video_erase_char =
2334                             ((c & 0xfe00) >> 1) | (c & 0xff);
2335                         vc->vc_attr >>= 1;
2336                 }
2337         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2338                 vc->vc_hi_font_mask = 0x100;
2339                 if (vc->vc_can_do_color) {
2340                         vc->vc_complement_mask <<= 1;
2341                         vc->vc_s_complement_mask <<= 1;
2342                 }
2343                         
2344                 /* ++Edmund: reorder the attribute bits */
2345                 {
2346                         unsigned short *cp =
2347                             (unsigned short *) vc->vc_origin;
2348                         int count = vc->vc_screenbuf_size / 2;
2349                         unsigned short c;
2350                         for (; count > 0; count--, cp++) {
2351                                 unsigned short newc;
2352                                 c = scr_readw(cp);
2353                                 if (vc->vc_can_do_color)
2354                                         newc =
2355                                             ((c & 0xff00) << 1) | (c &
2356                                                                    0xff);
2357                                 else
2358                                         newc = c & ~0x100;
2359                                 scr_writew(newc, cp);
2360                         }
2361                         c = vc->vc_video_erase_char;
2362                         if (vc->vc_can_do_color) {
2363                                 vc->vc_video_erase_char =
2364                                     ((c & 0xff00) << 1) | (c & 0xff);
2365                                 vc->vc_attr <<= 1;
2366                         } else
2367                                 vc->vc_video_erase_char = c & ~0x100;
2368                 }
2369
2370         }
2371
2372         if (resize) {
2373                 int cols, rows;
2374
2375                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2376                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2377                 cols /= w;
2378                 rows /= h;
2379                 vc_resize(vc, cols, rows);
2380                 if (CON_IS_VISIBLE(vc) && softback_buf)
2381                         fbcon_update_softback(vc);
2382         } else if (CON_IS_VISIBLE(vc)
2383                    && vc->vc_mode == KD_TEXT) {
2384                 fbcon_clear_margins(vc, 0);
2385                 update_screen(vc);
2386         }
2387
2388         if (old_data && (--REFCOUNT(old_data) == 0))
2389                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2390         return 0;
2391 }
2392
2393 static int fbcon_copy_font(struct vc_data *vc, int con)
2394 {
2395         struct display *od = &fb_display[con];
2396         struct console_font *f = &vc->vc_font;
2397
2398         if (od->fontdata == f->data)
2399                 return 0;       /* already the same font... */
2400         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2401 }
2402
2403 /*
2404  *  User asked to set font; we are guaranteed that
2405  *      a) width and height are in range 1..32
2406  *      b) charcount does not exceed 512
2407  *  but lets not assume that, since someone might someday want to use larger
2408  *  fonts. And charcount of 512 is small for unicode support.
2409  *
2410  *  However, user space gives the font in 32 rows , regardless of
2411  *  actual font height. So a new API is needed if support for larger fonts
2412  *  is ever implemented.
2413  */
2414
2415 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2416 {
2417         unsigned charcount = font->charcount;
2418         int w = font->width;
2419         int h = font->height;
2420         int size;
2421         int i, csum;
2422         u8 *new_data, *data = font->data;
2423         int pitch = (font->width+7) >> 3;
2424
2425         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2426          * If not this check should be changed to charcount < 256 */
2427         if (charcount != 256 && charcount != 512)
2428                 return -EINVAL;
2429
2430         size = h * pitch * charcount;
2431
2432         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2433
2434         if (!new_data)
2435                 return -ENOMEM;
2436
2437         new_data += FONT_EXTRA_WORDS * sizeof(int);
2438         FNTSIZE(new_data) = size;
2439         FNTCHARCNT(new_data) = charcount;
2440         REFCOUNT(new_data) = 0; /* usage counter */
2441         for (i=0; i< charcount; i++) {
2442                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2443         }
2444
2445         /* Since linux has a nice crc32 function use it for counting font
2446          * checksums. */
2447         csum = crc32(0, new_data, size);
2448
2449         FNTSUM(new_data) = csum;
2450         /* Check if the same font is on some other console already */
2451         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2452                 struct vc_data *tmp = vc_cons[i].d;
2453                 
2454                 if (fb_display[i].userfont &&
2455                     fb_display[i].fontdata &&
2456                     FNTSUM(fb_display[i].fontdata) == csum &&
2457                     FNTSIZE(fb_display[i].fontdata) == size &&
2458                     tmp->vc_font.width == w &&
2459                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2460                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2461                         new_data = (u8 *)fb_display[i].fontdata;
2462                         break;
2463                 }
2464         }
2465         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2466 }
2467
2468 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2469 {
2470         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2471         const struct font_desc *f;
2472
2473         if (!name)
2474                 f = get_default_font(info->var.xres, info->var.yres);
2475         else if (!(f = find_font(name)))
2476                 return -ENOENT;
2477
2478         font->width = f->width;
2479         font->height = f->height;
2480         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2481 }
2482
2483 static u16 palette_red[16];
2484 static u16 palette_green[16];
2485 static u16 palette_blue[16];
2486
2487 static struct fb_cmap palette_cmap = {
2488         0, 16, palette_red, palette_green, palette_blue, NULL
2489 };
2490
2491 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2492 {
2493         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2494         int i, j, k, depth;
2495         u8 val;
2496
2497         if (fbcon_is_inactive(vc, info))
2498                 return -EINVAL;
2499
2500         if (!CON_IS_VISIBLE(vc))
2501                 return 0;
2502
2503         depth = fb_get_color_depth(&info->var, &info->fix);
2504         if (depth > 3) {
2505                 for (i = j = 0; i < 16; i++) {
2506                         k = table[i];
2507                         val = vc->vc_palette[j++];
2508                         palette_red[k] = (val << 8) | val;
2509                         val = vc->vc_palette[j++];
2510                         palette_green[k] = (val << 8) | val;
2511                         val = vc->vc_palette[j++];
2512                         palette_blue[k] = (val << 8) | val;
2513                 }
2514                 palette_cmap.len = 16;
2515                 palette_cmap.start = 0;
2516         /*
2517          * If framebuffer is capable of less than 16 colors,
2518          * use default palette of fbcon.
2519          */
2520         } else
2521                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2522
2523         return fb_set_cmap(&palette_cmap, info);
2524 }
2525
2526 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2527 {
2528         unsigned long p;
2529         int line;
2530         
2531         if (vc->vc_num != fg_console || !softback_lines)
2532                 return (u16 *) (vc->vc_origin + offset);
2533         line = offset / vc->vc_size_row;
2534         if (line >= softback_lines)
2535                 return (u16 *) (vc->vc_origin + offset -
2536                                 softback_lines * vc->vc_size_row);
2537         p = softback_curr + offset;
2538         if (p >= softback_end)
2539                 p += softback_buf - softback_end;
2540         return (u16 *) p;
2541 }
2542
2543 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2544                                  int *px, int *py)
2545 {
2546         unsigned long ret;
2547         int x, y;
2548
2549         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2550                 unsigned long offset = (pos - vc->vc_origin) / 2;
2551
2552                 x = offset % vc->vc_cols;
2553                 y = offset / vc->vc_cols;
2554                 if (vc->vc_num == fg_console)
2555                         y += softback_lines;
2556                 ret = pos + (vc->vc_cols - x) * 2;
2557         } else if (vc->vc_num == fg_console && softback_lines) {
2558                 unsigned long offset = pos - softback_curr;
2559
2560                 if (pos < softback_curr)
2561                         offset += softback_end - softback_buf;
2562                 offset /= 2;
2563                 x = offset % vc->vc_cols;
2564                 y = offset / vc->vc_cols;
2565                 ret = pos + (vc->vc_cols - x) * 2;
2566                 if (ret == softback_end)
2567                         ret = softback_buf;
2568                 if (ret == softback_in)
2569                         ret = vc->vc_origin;
2570         } else {
2571                 /* Should not happen */
2572                 x = y = 0;
2573                 ret = vc->vc_origin;
2574         }
2575         if (px)
2576                 *px = x;
2577         if (py)
2578                 *py = y;
2579         return ret;
2580 }
2581
2582 /* As we might be inside of softback, we may work with non-contiguous buffer,
2583    that's why we have to use a separate routine. */
2584 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2585 {
2586         while (cnt--) {
2587                 u16 a = scr_readw(p);
2588                 if (!vc->vc_can_do_color)
2589                         a ^= 0x0800;
2590                 else if (vc->vc_hi_font_mask == 0x100)
2591                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2592                             (((a) & 0x0e00) << 4);
2593                 else
2594                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2595                             (((a) & 0x0700) << 4);
2596                 scr_writew(a, p++);
2597                 if (p == (u16 *) softback_end)
2598                         p = (u16 *) softback_buf;
2599                 if (p == (u16 *) softback_in)
2600                         p = (u16 *) vc->vc_origin;
2601         }
2602 }
2603
2604 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2605 {
2606         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2607         struct fbcon_ops *ops = info->fbcon_par;
2608         struct display *p = &fb_display[fg_console];
2609         int offset, limit, scrollback_old;
2610
2611         if (softback_top) {
2612                 if (vc->vc_num != fg_console)
2613                         return 0;
2614                 if (vc->vc_mode != KD_TEXT || !lines)
2615                         return 0;
2616                 if (logo_shown >= 0) {
2617                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2618
2619                         if (conp2->vc_top == logo_lines
2620                             && conp2->vc_bottom == conp2->vc_rows)
2621                                 conp2->vc_top = 0;
2622                         if (logo_shown == vc->vc_num) {
2623                                 unsigned long p, q;
2624                                 int i;
2625
2626                                 p = softback_in;
2627                                 q = vc->vc_origin +
2628                                     logo_lines * vc->vc_size_row;
2629                                 for (i = 0; i < logo_lines; i++) {
2630                                         if (p == softback_top)
2631                                                 break;
2632                                         if (p == softback_buf)
2633                                                 p = softback_end;
2634                                         p -= vc->vc_size_row;
2635                                         q -= vc->vc_size_row;
2636                                         scr_memcpyw((u16 *) q, (u16 *) p,
2637                                                     vc->vc_size_row);
2638                                 }
2639                                 softback_in = p;
2640                                 update_region(vc, vc->vc_origin,
2641                                               logo_lines * vc->vc_cols);
2642                         }
2643                         logo_shown = FBCON_LOGO_CANSHOW;
2644                 }
2645                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2646                 fbcon_redraw_softback(vc, p, lines);
2647                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2648                 return 0;
2649         }
2650
2651         if (!scrollback_phys_max)
2652                 return -ENOSYS;
2653
2654         scrollback_old = scrollback_current;
2655         scrollback_current -= lines;
2656         if (scrollback_current < 0)
2657                 scrollback_current = 0;
2658         else if (scrollback_current > scrollback_max)
2659                 scrollback_current = scrollback_max;
2660         if (scrollback_current == scrollback_old)
2661                 return 0;
2662
2663         if (fbcon_is_inactive(vc, info))
2664                 return 0;
2665
2666         fbcon_cursor(vc, CM_ERASE);
2667
2668         offset = p->yscroll - scrollback_current;
2669         limit = p->vrows;
2670         switch (p->scrollmode) {
2671         case SCROLL_WRAP_MOVE:
2672                 info->var.vmode |= FB_VMODE_YWRAP;
2673                 break;
2674         case SCROLL_PAN_MOVE:
2675         case SCROLL_PAN_REDRAW:
2676                 limit -= vc->vc_rows;
2677                 info->var.vmode &= ~FB_VMODE_YWRAP;
2678                 break;
2679         }
2680         if (offset < 0)
2681                 offset += limit;
2682         else if (offset >= limit)
2683                 offset -= limit;
2684
2685         ops->var.xoffset = 0;
2686         ops->var.yoffset = offset * vc->vc_font.height;
2687         ops->update_start(info);
2688
2689         if (!scrollback_current)
2690                 fbcon_cursor(vc, CM_DRAW);
2691         return 0;
2692 }
2693
2694 static int fbcon_set_origin(struct vc_data *vc)
2695 {
2696         if (softback_lines)
2697                 fbcon_scrolldelta(vc, softback_lines);
2698         return 0;
2699 }
2700
2701 static void fbcon_suspended(struct fb_info *info)
2702 {
2703         struct vc_data *vc = NULL;
2704         struct fbcon_ops *ops = info->fbcon_par;
2705
2706         if (!ops || ops->currcon < 0)
2707                 return;
2708         vc = vc_cons[ops->currcon].d;
2709
2710         /* Clear cursor, restore saved data */
2711         fbcon_cursor(vc, CM_ERASE);
2712 }
2713
2714 static void fbcon_resumed(struct fb_info *info)
2715 {
2716         struct vc_data *vc;
2717         struct fbcon_ops *ops = info->fbcon_par;
2718
2719         if (!ops || ops->currcon < 0)
2720                 return;
2721         vc = vc_cons[ops->currcon].d;
2722
2723         update_screen(vc);
2724 }
2725
2726 static void fbcon_modechanged(struct fb_info *info)
2727 {
2728         struct fbcon_ops *ops = info->fbcon_par;
2729         struct vc_data *vc;
2730         struct display *p;
2731         int rows, cols;
2732
2733         if (!ops || ops->currcon < 0)
2734                 return;
2735         vc = vc_cons[ops->currcon].d;
2736         if (vc->vc_mode != KD_TEXT ||
2737             registered_fb[con2fb_map[ops->currcon]] != info)
2738                 return;
2739
2740         p = &fb_display[vc->vc_num];
2741         set_blitting_type(vc, info, p);
2742
2743         if (CON_IS_VISIBLE(vc)) {
2744                 var_to_display(p, &info->var, info);
2745                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2746                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2747                 cols /= vc->vc_font.width;
2748                 rows /= vc->vc_font.height;
2749                 vc_resize(vc, cols, rows);
2750                 updatescrollmode(p, info, vc);
2751                 scrollback_max = 0;
2752                 scrollback_current = 0;
2753
2754                 if (!fbcon_is_inactive(vc, info)) {
2755                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2756                     ops->update_start(info);
2757                 }
2758
2759                 fbcon_set_palette(vc, color_table);
2760                 update_screen(vc);
2761                 if (softback_buf)
2762                         fbcon_update_softback(vc);
2763         }
2764 }
2765
2766 static void fbcon_set_all_vcs(struct fb_info *info)
2767 {
2768         struct fbcon_ops *ops = info->fbcon_par;
2769         struct vc_data *vc;
2770         struct display *p;
2771         int i, rows, cols;
2772
2773         if (!ops || ops->currcon < 0)
2774                 return;
2775
2776         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2777                 vc = vc_cons[i].d;
2778                 if (!vc || vc->vc_mode != KD_TEXT ||
2779                     registered_fb[con2fb_map[i]] != info)
2780                         continue;
2781
2782                 p = &fb_display[vc->vc_num];
2783                 set_blitting_type(vc, info, p);
2784                 var_to_display(p, &info->var, info);
2785                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2786                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2787                 cols /= vc->vc_font.width;
2788                 rows /= vc->vc_font.height;
2789                 vc_resize(vc, cols, rows);
2790
2791                 if (CON_IS_VISIBLE(vc)) {
2792                         updatescrollmode(p, info, vc);
2793                         scrollback_max = 0;
2794                         scrollback_current = 0;
2795
2796                         if (!fbcon_is_inactive(vc, info)) {
2797                             ops->var.xoffset = ops->var.yoffset =
2798                                 p->yscroll = 0;
2799                             ops->update_start(info);
2800                         }
2801
2802                         fbcon_set_palette(vc, color_table);
2803                         update_screen(vc);
2804                         if (softback_buf)
2805                                 fbcon_update_softback(vc);
2806                 }
2807         }
2808 }
2809
2810 static int fbcon_mode_deleted(struct fb_info *info,
2811                               struct fb_videomode *mode)
2812 {
2813         struct fb_info *fb_info;
2814         struct display *p;
2815         int i, j, found = 0;
2816
2817         /* before deletion, ensure that mode is not in use */
2818         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2819                 j = con2fb_map[i];
2820                 if (j == -1)
2821                         continue;
2822                 fb_info = registered_fb[j];
2823                 if (fb_info != info)
2824                         continue;
2825                 p = &fb_display[i];
2826                 if (!p || !p->mode)
2827                         continue;
2828                 if (fb_mode_is_equal(p->mode, mode)) {
2829                         found = 1;
2830                         break;
2831                 }
2832         }
2833         return found;
2834 }
2835
2836 static int fbcon_fb_registered(int idx)
2837 {
2838         int ret = 0, i;
2839
2840         if (info_idx == -1) {
2841                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2842                         if (con2fb_map_boot[i] == idx) {
2843                                 info_idx = idx;
2844                                 break;
2845                         }
2846                 }
2847                 if (info_idx != -1)
2848                         ret = fbcon_takeover(1);
2849         } else {
2850                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2851                         if (con2fb_map_boot[i] == idx)
2852                                 set_con2fb_map(i, idx, 0);
2853                 }
2854         }
2855
2856         return ret;
2857 }
2858
2859 static void fbcon_fb_blanked(struct fb_info *info, int blank)
2860 {
2861         struct fbcon_ops *ops = info->fbcon_par;
2862         struct vc_data *vc;
2863
2864         if (!ops || ops->currcon < 0)
2865                 return;
2866
2867         vc = vc_cons[ops->currcon].d;
2868         if (vc->vc_mode != KD_TEXT ||
2869                         registered_fb[con2fb_map[ops->currcon]] != info)
2870                 return;
2871
2872         if (CON_IS_VISIBLE(vc)) {
2873                 if (blank)
2874                         do_blank_screen(0);
2875                 else
2876                         do_unblank_screen(0);
2877         }
2878         ops->blank_state = blank;
2879 }
2880
2881 static void fbcon_new_modelist(struct fb_info *info)
2882 {
2883         int i;
2884         struct vc_data *vc;
2885         struct fb_var_screeninfo var;
2886         struct fb_videomode *mode;
2887
2888         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2889                 if (registered_fb[con2fb_map[i]] != info)
2890                         continue;
2891                 if (!fb_display[i].mode)
2892                         continue;
2893                 vc = vc_cons[i].d;
2894                 display_to_var(&var, &fb_display[i]);
2895                 mode = fb_find_nearest_mode(fb_display[i].mode,
2896                                             &info->modelist);
2897                 fb_videomode_to_var(&var, mode);
2898
2899                 if (vc)
2900                         fbcon_set_disp(info, &var, vc);
2901                 else
2902                         fbcon_preset_disp(info, &var, i);
2903
2904         }
2905 }
2906
2907 static int fbcon_event_notify(struct notifier_block *self, 
2908                               unsigned long action, void *data)
2909 {
2910         struct fb_event *event = data;
2911         struct fb_info *info = event->info;
2912         struct fb_videomode *mode;
2913         struct fb_con2fbmap *con2fb;
2914         int ret = 0;
2915
2916         switch(action) {
2917         case FB_EVENT_SUSPEND:
2918                 fbcon_suspended(info);
2919                 break;
2920         case FB_EVENT_RESUME:
2921                 fbcon_resumed(info);
2922                 break;
2923         case FB_EVENT_MODE_CHANGE:
2924                 fbcon_modechanged(info);
2925                 break;
2926         case FB_EVENT_MODE_CHANGE_ALL:
2927                 fbcon_set_all_vcs(info);
2928                 break;
2929         case FB_EVENT_MODE_DELETE:
2930                 mode = event->data;
2931                 ret = fbcon_mode_deleted(info, mode);
2932                 break;
2933         case FB_EVENT_FB_REGISTERED:
2934                 ret = fbcon_fb_registered(info->node);
2935                 break;
2936         case FB_EVENT_SET_CONSOLE_MAP:
2937                 con2fb = event->data;
2938                 ret = set_con2fb_map(con2fb->console - 1,
2939                                      con2fb->framebuffer, 1);
2940                 break;
2941         case FB_EVENT_GET_CONSOLE_MAP:
2942                 con2fb = event->data;
2943                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
2944                 break;
2945         case FB_EVENT_BLANK:
2946                 fbcon_fb_blanked(info, *(int *)event->data);
2947                 break;
2948         case FB_EVENT_NEW_MODELIST:
2949                 fbcon_new_modelist(info);
2950                 break;
2951         case FB_EVENT_SET_CON_ROTATE:
2952                 fbcon_rotate(info, *(int *)event->data);
2953                 break;
2954         case FB_EVENT_GET_CON_ROTATE:
2955                 ret = fbcon_get_rotate(info);
2956                 break;
2957         case FB_EVENT_SET_CON_ROTATE_ALL:
2958                 fbcon_rotate_all(info, *(int *)event->data);
2959         }
2960
2961         return ret;
2962 }
2963
2964 /*
2965  *  The console `switch' structure for the frame buffer based console
2966  */
2967
2968 static const struct consw fb_con = {
2969         .owner                  = THIS_MODULE,
2970         .con_startup            = fbcon_startup,
2971         .con_init               = fbcon_init,
2972         .con_deinit             = fbcon_deinit,
2973         .con_clear              = fbcon_clear,
2974         .con_putc               = fbcon_putc,
2975         .con_putcs              = fbcon_putcs,
2976         .con_cursor             = fbcon_cursor,
2977         .con_scroll             = fbcon_scroll,
2978         .con_bmove              = fbcon_bmove,
2979         .con_switch             = fbcon_switch,
2980         .con_blank              = fbcon_blank,
2981         .con_font_set           = fbcon_set_font,
2982         .con_font_get           = fbcon_get_font,
2983         .con_font_default       = fbcon_set_def_font,
2984         .con_font_copy          = fbcon_copy_font,
2985         .con_set_palette        = fbcon_set_palette,
2986         .con_scrolldelta        = fbcon_scrolldelta,
2987         .con_set_origin         = fbcon_set_origin,
2988         .con_invert_region      = fbcon_invert_region,
2989         .con_screen_pos         = fbcon_screen_pos,
2990         .con_getxy              = fbcon_getxy,
2991         .con_resize             = fbcon_resize,
2992 };
2993
2994 static struct notifier_block fbcon_event_notifier = {
2995         .notifier_call  = fbcon_event_notify,
2996 };
2997
2998 static int __init fb_console_init(void)
2999 {
3000         int i;
3001
3002         acquire_console_sem();
3003         fb_register_client(&fbcon_event_notifier);
3004         release_console_sem();
3005
3006         for (i = 0; i < MAX_NR_CONSOLES; i++)
3007                 con2fb_map[i] = -1;
3008
3009         if (num_registered_fb) {
3010                 for (i = 0; i < FB_MAX; i++) {
3011                         if (registered_fb[i] != NULL) {
3012                                 info_idx = i;
3013                                 break;
3014                         }
3015                 }
3016                 fbcon_takeover(0);
3017         }
3018
3019         return 0;
3020 }
3021
3022 module_init(fb_console_init);
3023
3024 #ifdef MODULE
3025
3026 static void __exit fb_console_exit(void)
3027 {
3028         acquire_console_sem();
3029         fb_unregister_client(&fbcon_event_notifier);
3030         release_console_sem();
3031         give_up_console(&fb_con);
3032 }       
3033
3034 module_exit(fb_console_exit);
3035
3036 #endif
3037
3038 MODULE_LICENSE("GPL");