video: fix some comments in drivers/video/console/vgacon.c
[linux-2.6.git] / drivers / video / console / vgacon.c
1 /*
2  *  linux/drivers/video/vgacon.c -- Low level VGA based console driver
3  *
4  *      Created 28 Sep 1997 by Geert Uytterhoeven
5  *
6  *      Rewritten by Martin Mares <mj@ucw.cz>, July 1998
7  *
8  *  This file is based on the old console.c, vga.c and vesa_blank.c drivers.
9  *
10  *      Copyright (C) 1991, 1992  Linus Torvalds
11  *                          1995  Jay Estabrook
12  *
13  *      User definable mapping table and font loading by Eugene G. Crosser,
14  *      <crosser@average.org>
15  *
16  *      Improved loadable font/UTF-8 support by H. Peter Anvin
17  *      Feb-Sep 1995 <peter.anvin@linux.org>
18  *
19  *      Colour palette handling, by Simon Tatham
20  *      17-Jun-95 <sgt20@cam.ac.uk>
21  *
22  *      if 512 char mode is already enabled don't re-enable it,
23  *      because it causes screen to flicker, by Mitja Horvat
24  *      5-May-96 <mitja.horvat@guest.arnes.si>
25  *
26  *      Use 2 outw instead of 4 outb_p to reduce erroneous text
27  *      flashing on RHS of screen during heavy console scrolling .
28  *      Oct 1996, Paul Gortmaker.
29  *
30  *
31  *  This file is subject to the terms and conditions of the GNU General Public
32  *  License.  See the file COPYING in the main directory of this archive for
33  *  more details.
34  */
35
36 #include <linux/module.h>
37 #include <linux/types.h>
38 #include <linux/fs.h>
39 #include <linux/kernel.h>
40 #include <linux/console.h>
41 #include <linux/string.h>
42 #include <linux/kd.h>
43 #include <linux/slab.h>
44 #include <linux/vt_kern.h>
45 #include <linux/selection.h>
46 #include <linux/spinlock.h>
47 #include <linux/ioport.h>
48 #include <linux/init.h>
49 #include <linux/screen_info.h>
50 #include <video/vga.h>
51 #include <asm/io.h>
52
53 static DEFINE_SPINLOCK(vga_lock);
54 static int cursor_size_lastfrom;
55 static int cursor_size_lastto;
56 static u32 vgacon_xres;
57 static u32 vgacon_yres;
58 static struct vgastate state;
59
60 #define BLANK 0x0020
61
62 #define CAN_LOAD_EGA_FONTS      /* undefine if the user must not do this */
63 #define CAN_LOAD_PALETTE        /* undefine if the user must not do this */
64
65 /* You really do _NOT_ want to define this, unless you have buggy
66  * Trident VGA which will resize cursor when moving it between column
67  * 15 & 16. If you define this and your VGA is OK, inverse bug will
68  * appear.
69  */
70 #undef TRIDENT_GLITCH
71 #define VGA_FONTWIDTH       8   /* VGA does not support fontwidths != 8 */
72 /*
73  *  Interface used by the world
74  */
75
76 static const char *vgacon_startup(void);
77 static void vgacon_init(struct vc_data *c, int init);
78 static void vgacon_deinit(struct vc_data *c);
79 static void vgacon_cursor(struct vc_data *c, int mode);
80 static int vgacon_switch(struct vc_data *c);
81 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch);
82 static int vgacon_set_palette(struct vc_data *vc, unsigned char *table);
83 static int vgacon_scrolldelta(struct vc_data *c, int lines);
84 static int vgacon_set_origin(struct vc_data *c);
85 static void vgacon_save_screen(struct vc_data *c);
86 static int vgacon_scroll(struct vc_data *c, int t, int b, int dir,
87                          int lines);
88 static void vgacon_invert_region(struct vc_data *c, u16 * p, int count);
89 static unsigned long vgacon_uni_pagedir[2];
90
91 /* Description of the hardware situation */
92 static int              vga_init_done           __read_mostly;
93 static unsigned long    vga_vram_base           __read_mostly;  /* Base of video memory */
94 static unsigned long    vga_vram_end            __read_mostly;  /* End of video memory */
95 static unsigned int     vga_vram_size           __read_mostly;  /* Size of video memory */
96 static u16              vga_video_port_reg      __read_mostly;  /* Video register select port */
97 static u16              vga_video_port_val      __read_mostly;  /* Video register value port */
98 static unsigned int     vga_video_num_columns;                  /* Number of text columns */
99 static unsigned int     vga_video_num_lines;                    /* Number of text lines */
100 static int              vga_can_do_color        __read_mostly;  /* Do we support colors? */
101 static unsigned int     vga_default_font_height __read_mostly;  /* Height of default screen font */
102 static unsigned char    vga_video_type          __read_mostly;  /* Card type */
103 static unsigned char    vga_hardscroll_enabled  __read_mostly;
104 static unsigned char    vga_hardscroll_user_enable __read_mostly = 1;
105 static unsigned char    vga_font_is_default = 1;
106 static int              vga_vesa_blanked;
107 static int              vga_palette_blanked;
108 static int              vga_is_gfx;
109 static int              vga_512_chars;
110 static int              vga_video_font_height;
111 static int              vga_scan_lines          __read_mostly;
112 static unsigned int     vga_rolled_over;
113
114 static int vgacon_text_mode_force;
115
116 bool vgacon_text_force(void)
117 {
118         return vgacon_text_mode_force ? true : false;
119 }
120 EXPORT_SYMBOL(vgacon_text_force);
121
122 static int __init text_mode(char *str)
123 {
124         vgacon_text_mode_force = 1;
125         return 1;
126 }
127
128 /* force text mode - used by kernel modesetting */
129 __setup("nomodeset", text_mode);
130
131 static int __init no_scroll(char *str)
132 {
133         /*
134          * Disabling scrollback is required for the Braillex ib80-piezo
135          * Braille reader made by F.H. Papenmeier (Germany).
136          * Use the "no-scroll" bootflag.
137          */
138         vga_hardscroll_user_enable = vga_hardscroll_enabled = 0;
139         return 1;
140 }
141
142 __setup("no-scroll", no_scroll);
143
144 /*
145  * By replacing the four outb_p with two back to back outw, we can reduce
146  * the window of opportunity to see text mislocated to the RHS of the
147  * console during heavy scrolling activity. However there is the remote
148  * possibility that some pre-dinosaur hardware won't like the back to back
149  * I/O. Since the Xservers get away with it, we should be able to as well.
150  */
151 static inline void write_vga(unsigned char reg, unsigned int val)
152 {
153         unsigned int v1, v2;
154         unsigned long flags;
155
156         /*
157          * ddprintk might set the console position from interrupt
158          * handlers, thus the write has to be IRQ-atomic.
159          */
160         spin_lock_irqsave(&vga_lock, flags);
161
162 #ifndef SLOW_VGA
163         v1 = reg + (val & 0xff00);
164         v2 = reg + 1 + ((val << 8) & 0xff00);
165         outw(v1, vga_video_port_reg);
166         outw(v2, vga_video_port_reg);
167 #else
168         outb_p(reg, vga_video_port_reg);
169         outb_p(val >> 8, vga_video_port_val);
170         outb_p(reg + 1, vga_video_port_reg);
171         outb_p(val & 0xff, vga_video_port_val);
172 #endif
173         spin_unlock_irqrestore(&vga_lock, flags);
174 }
175
176 static inline void vga_set_mem_top(struct vc_data *c)
177 {
178         write_vga(12, (c->vc_visible_origin - vga_vram_base) / 2);
179 }
180
181 #ifdef CONFIG_VGACON_SOFT_SCROLLBACK
182 /* software scrollback */
183 static void *vgacon_scrollback;
184 static int vgacon_scrollback_tail;
185 static int vgacon_scrollback_size;
186 static int vgacon_scrollback_rows;
187 static int vgacon_scrollback_cnt;
188 static int vgacon_scrollback_cur;
189 static int vgacon_scrollback_save;
190 static int vgacon_scrollback_restore;
191
192 static void vgacon_scrollback_init(int pitch)
193 {
194         int rows = CONFIG_VGACON_SOFT_SCROLLBACK_SIZE * 1024/pitch;
195
196         if (vgacon_scrollback) {
197                 vgacon_scrollback_cnt  = 0;
198                 vgacon_scrollback_tail = 0;
199                 vgacon_scrollback_cur  = 0;
200                 vgacon_scrollback_rows = rows - 1;
201                 vgacon_scrollback_size = rows * pitch;
202         }
203 }
204
205 static void vgacon_scrollback_startup(void)
206 {
207         vgacon_scrollback = kcalloc(CONFIG_VGACON_SOFT_SCROLLBACK_SIZE, 1024, GFP_NOWAIT);
208         vgacon_scrollback_init(vga_video_num_columns * 2);
209 }
210
211 static void vgacon_scrollback_update(struct vc_data *c, int t, int count)
212 {
213         void *p;
214
215         if (!vgacon_scrollback_size || c->vc_num != fg_console)
216                 return;
217
218         p = (void *) (c->vc_origin + t * c->vc_size_row);
219
220         while (count--) {
221                 scr_memcpyw(vgacon_scrollback + vgacon_scrollback_tail,
222                             p, c->vc_size_row);
223                 vgacon_scrollback_cnt++;
224                 p += c->vc_size_row;
225                 vgacon_scrollback_tail += c->vc_size_row;
226
227                 if (vgacon_scrollback_tail >= vgacon_scrollback_size)
228                         vgacon_scrollback_tail = 0;
229
230                 if (vgacon_scrollback_cnt > vgacon_scrollback_rows)
231                         vgacon_scrollback_cnt = vgacon_scrollback_rows;
232
233                 vgacon_scrollback_cur = vgacon_scrollback_cnt;
234         }
235 }
236
237 static void vgacon_restore_screen(struct vc_data *c)
238 {
239         vgacon_scrollback_save = 0;
240
241         if (!vga_is_gfx && !vgacon_scrollback_restore) {
242                 scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,
243                             c->vc_screenbuf_size > vga_vram_size ?
244                             vga_vram_size : c->vc_screenbuf_size);
245                 vgacon_scrollback_restore = 1;
246                 vgacon_scrollback_cur = vgacon_scrollback_cnt;
247         }
248 }
249
250 static int vgacon_scrolldelta(struct vc_data *c, int lines)
251 {
252         int start, end, count, soff;
253
254         if (!lines) {
255                 c->vc_visible_origin = c->vc_origin;
256                 vga_set_mem_top(c);
257                 return 1;
258         }
259
260         if (!vgacon_scrollback)
261                 return 1;
262
263         if (!vgacon_scrollback_save) {
264                 vgacon_cursor(c, CM_ERASE);
265                 vgacon_save_screen(c);
266                 vgacon_scrollback_save = 1;
267         }
268
269         vgacon_scrollback_restore = 0;
270         start = vgacon_scrollback_cur + lines;
271         end = start + abs(lines);
272
273         if (start < 0)
274                 start = 0;
275
276         if (start > vgacon_scrollback_cnt)
277                 start = vgacon_scrollback_cnt;
278
279         if (end < 0)
280                 end = 0;
281
282         if (end > vgacon_scrollback_cnt)
283                 end = vgacon_scrollback_cnt;
284
285         vgacon_scrollback_cur = start;
286         count = end - start;
287         soff = vgacon_scrollback_tail - ((vgacon_scrollback_cnt - end) *
288                                          c->vc_size_row);
289         soff -= count * c->vc_size_row;
290
291         if (soff < 0)
292                 soff += vgacon_scrollback_size;
293
294         count = vgacon_scrollback_cnt - start;
295
296         if (count > c->vc_rows)
297                 count = c->vc_rows;
298
299         if (count) {
300                 int copysize;
301
302                 int diff = c->vc_rows - count;
303                 void *d = (void *) c->vc_origin;
304                 void *s = (void *) c->vc_screenbuf;
305
306                 count *= c->vc_size_row;
307                 /* how much memory to end of buffer left? */
308                 copysize = min(count, vgacon_scrollback_size - soff);
309                 scr_memcpyw(d, vgacon_scrollback + soff, copysize);
310                 d += copysize;
311                 count -= copysize;
312
313                 if (count) {
314                         scr_memcpyw(d, vgacon_scrollback, count);
315                         d += count;
316                 }
317
318                 if (diff)
319                         scr_memcpyw(d, s, diff * c->vc_size_row);
320         } else
321                 vgacon_cursor(c, CM_MOVE);
322
323         return 1;
324 }
325 #else
326 #define vgacon_scrollback_startup(...) do { } while (0)
327 #define vgacon_scrollback_init(...)    do { } while (0)
328 #define vgacon_scrollback_update(...)  do { } while (0)
329
330 static void vgacon_restore_screen(struct vc_data *c)
331 {
332         if (c->vc_origin != c->vc_visible_origin)
333                 vgacon_scrolldelta(c, 0);
334 }
335
336 static int vgacon_scrolldelta(struct vc_data *c, int lines)
337 {
338         if (!lines)             /* Turn scrollback off */
339                 c->vc_visible_origin = c->vc_origin;
340         else {
341                 int margin = c->vc_size_row * 4;
342                 int ul, we, p, st;
343
344                 if (vga_rolled_over >
345                     (c->vc_scr_end - vga_vram_base) + margin) {
346                         ul = c->vc_scr_end - vga_vram_base;
347                         we = vga_rolled_over + c->vc_size_row;
348                 } else {
349                         ul = 0;
350                         we = vga_vram_size;
351                 }
352                 p = (c->vc_visible_origin - vga_vram_base - ul + we) % we +
353                     lines * c->vc_size_row;
354                 st = (c->vc_origin - vga_vram_base - ul + we) % we;
355                 if (st < 2 * margin)
356                         margin = 0;
357                 if (p < margin)
358                         p = 0;
359                 if (p > st - margin)
360                         p = st;
361                 c->vc_visible_origin = vga_vram_base + (p + ul) % we;
362         }
363         vga_set_mem_top(c);
364         return 1;
365 }
366 #endif /* CONFIG_VGACON_SOFT_SCROLLBACK */
367
368 static const char *vgacon_startup(void)
369 {
370         const char *display_desc = NULL;
371         u16 saved1, saved2;
372         volatile u16 *p;
373
374         if (screen_info.orig_video_isVGA == VIDEO_TYPE_VLFB ||
375             screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
376               no_vga:
377 #ifdef CONFIG_DUMMY_CONSOLE
378                 conswitchp = &dummy_con;
379                 return conswitchp->con_startup();
380 #else
381                 return NULL;
382 #endif
383         }
384
385         /* boot_params.screen_info initialized? */
386         if ((screen_info.orig_video_mode  == 0) &&
387             (screen_info.orig_video_lines == 0) &&
388             (screen_info.orig_video_cols  == 0))
389                 goto no_vga;
390
391         /* VGA16 modes are not handled by VGACON */
392         if ((screen_info.orig_video_mode == 0x0D) ||    /* 320x200/4 */
393             (screen_info.orig_video_mode == 0x0E) ||    /* 640x200/4 */
394             (screen_info.orig_video_mode == 0x10) ||    /* 640x350/4 */
395             (screen_info.orig_video_mode == 0x12) ||    /* 640x480/4 */
396             (screen_info.orig_video_mode == 0x6A))      /* 800x600/4 (VESA) */
397                 goto no_vga;
398
399         vga_video_num_lines = screen_info.orig_video_lines;
400         vga_video_num_columns = screen_info.orig_video_cols;
401         state.vgabase = NULL;
402
403         if (screen_info.orig_video_mode == 7) {
404                 /* Monochrome display */
405                 vga_vram_base = 0xb0000;
406                 vga_video_port_reg = VGA_CRT_IM;
407                 vga_video_port_val = VGA_CRT_DM;
408                 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
409                         static struct resource ega_console_resource =
410                             { .name = "ega", .start = 0x3B0, .end = 0x3BF };
411                         vga_video_type = VIDEO_TYPE_EGAM;
412                         vga_vram_size = 0x8000;
413                         display_desc = "EGA+";
414                         request_resource(&ioport_resource,
415                                          &ega_console_resource);
416                 } else {
417                         static struct resource mda1_console_resource =
418                             { .name = "mda", .start = 0x3B0, .end = 0x3BB };
419                         static struct resource mda2_console_resource =
420                             { .name = "mda", .start = 0x3BF, .end = 0x3BF };
421                         vga_video_type = VIDEO_TYPE_MDA;
422                         vga_vram_size = 0x2000;
423                         display_desc = "*MDA";
424                         request_resource(&ioport_resource,
425                                          &mda1_console_resource);
426                         request_resource(&ioport_resource,
427                                          &mda2_console_resource);
428                         vga_video_font_height = 14;
429                 }
430         } else {
431                 /* If not, it is color. */
432                 vga_can_do_color = 1;
433                 vga_vram_base = 0xb8000;
434                 vga_video_port_reg = VGA_CRT_IC;
435                 vga_video_port_val = VGA_CRT_DC;
436                 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
437                         int i;
438
439                         vga_vram_size = 0x8000;
440
441                         if (!screen_info.orig_video_isVGA) {
442                                 static struct resource ega_console_resource
443                                     = { .name = "ega", .start = 0x3C0, .end = 0x3DF };
444                                 vga_video_type = VIDEO_TYPE_EGAC;
445                                 display_desc = "EGA";
446                                 request_resource(&ioport_resource,
447                                                  &ega_console_resource);
448                         } else {
449                                 static struct resource vga_console_resource
450                                     = { .name = "vga+", .start = 0x3C0, .end = 0x3DF };
451                                 vga_video_type = VIDEO_TYPE_VGAC;
452                                 display_desc = "VGA+";
453                                 request_resource(&ioport_resource,
454                                                  &vga_console_resource);
455
456 #ifdef VGA_CAN_DO_64KB
457                                 /*
458                                  * get 64K rather than 32K of video RAM.
459                                  * This doesn't actually work on all "VGA"
460                                  * controllers (it seems like setting MM=01
461                                  * and COE=1 isn't necessarily a good idea)
462                                  */
463                                 vga_vram_base = 0xa0000;
464                                 vga_vram_size = 0x10000;
465                                 outb_p(6, VGA_GFX_I);
466                                 outb_p(6, VGA_GFX_D);
467 #endif
468                                 /*
469                                  * Normalise the palette registers, to point
470                                  * the 16 screen colours to the first 16
471                                  * DAC entries.
472                                  */
473
474                                 for (i = 0; i < 16; i++) {
475                                         inb_p(VGA_IS1_RC);
476                                         outb_p(i, VGA_ATT_W);
477                                         outb_p(i, VGA_ATT_W);
478                                 }
479                                 outb_p(0x20, VGA_ATT_W);
480
481                                 /*
482                                  * Now set the DAC registers back to their
483                                  * default values
484                                  */
485                                 for (i = 0; i < 16; i++) {
486                                         outb_p(color_table[i], VGA_PEL_IW);
487                                         outb_p(default_red[i], VGA_PEL_D);
488                                         outb_p(default_grn[i], VGA_PEL_D);
489                                         outb_p(default_blu[i], VGA_PEL_D);
490                                 }
491                         }
492                 } else {
493                         static struct resource cga_console_resource =
494                             { .name = "cga", .start = 0x3D4, .end = 0x3D5 };
495                         vga_video_type = VIDEO_TYPE_CGA;
496                         vga_vram_size = 0x2000;
497                         display_desc = "*CGA";
498                         request_resource(&ioport_resource,
499                                          &cga_console_resource);
500                         vga_video_font_height = 8;
501                 }
502         }
503
504         vga_vram_base = VGA_MAP_MEM(vga_vram_base, vga_vram_size);
505         vga_vram_end = vga_vram_base + vga_vram_size;
506
507         /*
508          *      Find out if there is a graphics card present.
509          *      Are there smarter methods around?
510          */
511         p = (volatile u16 *) vga_vram_base;
512         saved1 = scr_readw(p);
513         saved2 = scr_readw(p + 1);
514         scr_writew(0xAA55, p);
515         scr_writew(0x55AA, p + 1);
516         if (scr_readw(p) != 0xAA55 || scr_readw(p + 1) != 0x55AA) {
517                 scr_writew(saved1, p);
518                 scr_writew(saved2, p + 1);
519                 goto no_vga;
520         }
521         scr_writew(0x55AA, p);
522         scr_writew(0xAA55, p + 1);
523         if (scr_readw(p) != 0x55AA || scr_readw(p + 1) != 0xAA55) {
524                 scr_writew(saved1, p);
525                 scr_writew(saved2, p + 1);
526                 goto no_vga;
527         }
528         scr_writew(saved1, p);
529         scr_writew(saved2, p + 1);
530
531         if (vga_video_type == VIDEO_TYPE_EGAC
532             || vga_video_type == VIDEO_TYPE_VGAC
533             || vga_video_type == VIDEO_TYPE_EGAM) {
534                 vga_hardscroll_enabled = vga_hardscroll_user_enable;
535                 vga_default_font_height = screen_info.orig_video_points;
536                 vga_video_font_height = screen_info.orig_video_points;
537                 /* This may be suboptimal but is a safe bet - go with it */
538                 vga_scan_lines =
539                     vga_video_font_height * vga_video_num_lines;
540         }
541
542         vgacon_xres = screen_info.orig_video_cols * VGA_FONTWIDTH;
543         vgacon_yres = vga_scan_lines;
544
545         if (!vga_init_done) {
546                 vgacon_scrollback_startup();
547                 vga_init_done = 1;
548         }
549
550         return display_desc;
551 }
552
553 static void vgacon_init(struct vc_data *c, int init)
554 {
555         unsigned long p;
556
557         /*
558          * We cannot be loaded as a module, therefore init is always 1,
559          * but vgacon_init can be called more than once, and init will
560          * not be 1.
561          */
562         c->vc_can_do_color = vga_can_do_color;
563
564         /* set dimensions manually if init != 0 since vc_resize() will fail */
565         if (init) {
566                 c->vc_cols = vga_video_num_columns;
567                 c->vc_rows = vga_video_num_lines;
568         } else
569                 vc_resize(c, vga_video_num_columns, vga_video_num_lines);
570
571         c->vc_scan_lines = vga_scan_lines;
572         c->vc_font.height = vga_video_font_height;
573         c->vc_complement_mask = 0x7700;
574         if (vga_512_chars)
575                 c->vc_hi_font_mask = 0x0800;
576         p = *c->vc_uni_pagedir_loc;
577         if (c->vc_uni_pagedir_loc == &c->vc_uni_pagedir ||
578             !--c->vc_uni_pagedir_loc[1])
579                 con_free_unimap(c);
580         c->vc_uni_pagedir_loc = vgacon_uni_pagedir;
581         vgacon_uni_pagedir[1]++;
582         if (!vgacon_uni_pagedir[0] && p)
583                 con_set_default_unimap(c);
584
585         /* Only set the default if the user didn't deliberately override it */
586         if (global_cursor_default == -1)
587                 global_cursor_default =
588                         !(screen_info.flags & VIDEO_FLAGS_NOCURSOR);
589 }
590
591 static void vgacon_deinit(struct vc_data *c)
592 {
593         /* When closing the active console, reset video origin */
594         if (CON_IS_VISIBLE(c)) {
595                 c->vc_visible_origin = vga_vram_base;
596                 vga_set_mem_top(c);
597         }
598
599         if (!--vgacon_uni_pagedir[1])
600                 con_free_unimap(c);
601         c->vc_uni_pagedir_loc = &c->vc_uni_pagedir;
602         con_set_default_unimap(c);
603 }
604
605 static u8 vgacon_build_attr(struct vc_data *c, u8 color, u8 intensity,
606                             u8 blink, u8 underline, u8 reverse, u8 italic)
607 {
608         u8 attr = color;
609
610         if (vga_can_do_color) {
611                 if (italic)
612                         attr = (attr & 0xF0) | c->vc_itcolor;
613                 else if (underline)
614                         attr = (attr & 0xf0) | c->vc_ulcolor;
615                 else if (intensity == 0)
616                         attr = (attr & 0xf0) | c->vc_halfcolor;
617         }
618         if (reverse)
619                 attr =
620                     ((attr) & 0x88) | ((((attr) >> 4) | ((attr) << 4)) &
621                                        0x77);
622         if (blink)
623                 attr ^= 0x80;
624         if (intensity == 2)
625                 attr ^= 0x08;
626         if (!vga_can_do_color) {
627                 if (italic)
628                         attr = (attr & 0xF8) | 0x02;
629                 else if (underline)
630                         attr = (attr & 0xf8) | 0x01;
631                 else if (intensity == 0)
632                         attr = (attr & 0xf0) | 0x08;
633         }
634         return attr;
635 }
636
637 static void vgacon_invert_region(struct vc_data *c, u16 * p, int count)
638 {
639         int col = vga_can_do_color;
640
641         while (count--) {
642                 u16 a = scr_readw(p);
643                 if (col)
644                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
645                             (((a) & 0x0700) << 4);
646                 else
647                         a ^= ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700;
648                 scr_writew(a, p++);
649         }
650 }
651
652 static void vgacon_set_cursor_size(int xpos, int from, int to)
653 {
654         unsigned long flags;
655         int curs, cure;
656
657 #ifdef TRIDENT_GLITCH
658         if (xpos < 16)
659                 from--, to--;
660 #endif
661
662         if ((from == cursor_size_lastfrom) && (to == cursor_size_lastto))
663                 return;
664         cursor_size_lastfrom = from;
665         cursor_size_lastto = to;
666
667         spin_lock_irqsave(&vga_lock, flags);
668         if (vga_video_type >= VIDEO_TYPE_VGAC) {
669                 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg);
670                 curs = inb_p(vga_video_port_val);
671                 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg);
672                 cure = inb_p(vga_video_port_val);
673         } else {
674                 curs = 0;
675                 cure = 0;
676         }
677
678         curs = (curs & 0xc0) | from;
679         cure = (cure & 0xe0) | to;
680
681         outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg);
682         outb_p(curs, vga_video_port_val);
683         outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg);
684         outb_p(cure, vga_video_port_val);
685         spin_unlock_irqrestore(&vga_lock, flags);
686 }
687
688 static void vgacon_cursor(struct vc_data *c, int mode)
689 {
690         if (c->vc_mode != KD_TEXT)
691                 return;
692
693         vgacon_restore_screen(c);
694
695         switch (mode) {
696         case CM_ERASE:
697                 write_vga(14, (c->vc_pos - vga_vram_base) / 2);
698                 if (vga_video_type >= VIDEO_TYPE_VGAC)
699                         vgacon_set_cursor_size(c->vc_x, 31, 30);
700                 else
701                         vgacon_set_cursor_size(c->vc_x, 31, 31);
702                 break;
703
704         case CM_MOVE:
705         case CM_DRAW:
706                 write_vga(14, (c->vc_pos - vga_vram_base) / 2);
707                 switch (c->vc_cursor_type & 0x0f) {
708                 case CUR_UNDERLINE:
709                         vgacon_set_cursor_size(c->vc_x,
710                                                c->vc_font.height -
711                                                (c->vc_font.height <
712                                                 10 ? 2 : 3),
713                                                c->vc_font.height -
714                                                (c->vc_font.height <
715                                                 10 ? 1 : 2));
716                         break;
717                 case CUR_TWO_THIRDS:
718                         vgacon_set_cursor_size(c->vc_x,
719                                                c->vc_font.height / 3,
720                                                c->vc_font.height -
721                                                (c->vc_font.height <
722                                                 10 ? 1 : 2));
723                         break;
724                 case CUR_LOWER_THIRD:
725                         vgacon_set_cursor_size(c->vc_x,
726                                                (c->vc_font.height * 2) / 3,
727                                                c->vc_font.height -
728                                                (c->vc_font.height <
729                                                 10 ? 1 : 2));
730                         break;
731                 case CUR_LOWER_HALF:
732                         vgacon_set_cursor_size(c->vc_x,
733                                                c->vc_font.height / 2,
734                                                c->vc_font.height -
735                                                (c->vc_font.height <
736                                                 10 ? 1 : 2));
737                         break;
738                 case CUR_NONE:
739                         if (vga_video_type >= VIDEO_TYPE_VGAC)
740                                 vgacon_set_cursor_size(c->vc_x, 31, 30);
741                         else
742                                 vgacon_set_cursor_size(c->vc_x, 31, 31);
743                         break;
744                 default:
745                         vgacon_set_cursor_size(c->vc_x, 1,
746                                                c->vc_font.height);
747                         break;
748                 }
749                 break;
750         }
751 }
752
753 static int vgacon_doresize(struct vc_data *c,
754                 unsigned int width, unsigned int height)
755 {
756         unsigned long flags;
757         unsigned int scanlines = height * c->vc_font.height;
758         u8 scanlines_lo = 0, r7 = 0, vsync_end = 0, mode, max_scan;
759
760         spin_lock_irqsave(&vga_lock, flags);
761
762         vgacon_xres = width * VGA_FONTWIDTH;
763         vgacon_yres = height * c->vc_font.height;
764         if (vga_video_type >= VIDEO_TYPE_VGAC) {
765                 outb_p(VGA_CRTC_MAX_SCAN, vga_video_port_reg);
766                 max_scan = inb_p(vga_video_port_val);
767
768                 if (max_scan & 0x80)
769                         scanlines <<= 1;
770
771                 outb_p(VGA_CRTC_MODE, vga_video_port_reg);
772                 mode = inb_p(vga_video_port_val);
773
774                 if (mode & 0x04)
775                         scanlines >>= 1;
776
777                 scanlines -= 1;
778                 scanlines_lo = scanlines & 0xff;
779
780                 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg);
781                 r7 = inb_p(vga_video_port_val) & ~0x42;
782
783                 if (scanlines & 0x100)
784                         r7 |= 0x02;
785                 if (scanlines & 0x200)
786                         r7 |= 0x40;
787
788                 /* deprotect registers */
789                 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
790                 vsync_end = inb_p(vga_video_port_val);
791                 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
792                 outb_p(vsync_end & ~0x80, vga_video_port_val);
793         }
794
795         outb_p(VGA_CRTC_H_DISP, vga_video_port_reg);
796         outb_p(width - 1, vga_video_port_val);
797         outb_p(VGA_CRTC_OFFSET, vga_video_port_reg);
798         outb_p(width >> 1, vga_video_port_val);
799
800         if (vga_video_type >= VIDEO_TYPE_VGAC) {
801                 outb_p(VGA_CRTC_V_DISP_END, vga_video_port_reg);
802                 outb_p(scanlines_lo, vga_video_port_val);
803                 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg);
804                 outb_p(r7,vga_video_port_val);
805
806                 /* reprotect registers */
807                 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
808                 outb_p(vsync_end, vga_video_port_val);
809         }
810
811         spin_unlock_irqrestore(&vga_lock, flags);
812         return 0;
813 }
814
815 static int vgacon_switch(struct vc_data *c)
816 {
817         int x = c->vc_cols * VGA_FONTWIDTH;
818         int y = c->vc_rows * c->vc_font.height;
819         int rows = screen_info.orig_video_lines * vga_default_font_height/
820                 c->vc_font.height;
821         /*
822          * We need to save screen size here as it's the only way
823          * we can spot the screen has been resized and we need to
824          * set size of freshly allocated screens ourselves.
825          */
826         vga_video_num_columns = c->vc_cols;
827         vga_video_num_lines = c->vc_rows;
828
829         /* We can only copy out the size of the video buffer here,
830          * otherwise we get into VGA BIOS */
831
832         if (!vga_is_gfx) {
833                 scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,
834                             c->vc_screenbuf_size > vga_vram_size ?
835                                 vga_vram_size : c->vc_screenbuf_size);
836
837                 if ((vgacon_xres != x || vgacon_yres != y) &&
838                     (!(vga_video_num_columns % 2) &&
839                      vga_video_num_columns <= screen_info.orig_video_cols &&
840                      vga_video_num_lines <= rows))
841                         vgacon_doresize(c, c->vc_cols, c->vc_rows);
842         }
843
844         vgacon_scrollback_init(c->vc_size_row);
845         return 0;               /* Redrawing not needed */
846 }
847
848 static void vga_set_palette(struct vc_data *vc, unsigned char *table)
849 {
850         int i, j;
851
852         vga_w(state.vgabase, VGA_PEL_MSK, 0xff);
853         for (i = j = 0; i < 16; i++) {
854                 vga_w(state.vgabase, VGA_PEL_IW, table[i]);
855                 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
856                 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
857                 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
858         }
859 }
860
861 static int vgacon_set_palette(struct vc_data *vc, unsigned char *table)
862 {
863 #ifdef CAN_LOAD_PALETTE
864         if (vga_video_type != VIDEO_TYPE_VGAC || vga_palette_blanked
865             || !CON_IS_VISIBLE(vc))
866                 return -EINVAL;
867         vga_set_palette(vc, table);
868         return 0;
869 #else
870         return -EINVAL;
871 #endif
872 }
873
874 /* structure holding original VGA register settings */
875 static struct {
876         unsigned char SeqCtrlIndex;     /* Sequencer Index reg.   */
877         unsigned char CrtCtrlIndex;     /* CRT-Contr. Index reg.  */
878         unsigned char CrtMiscIO;        /* Miscellaneous register */
879         unsigned char HorizontalTotal;  /* CRT-Controller:00h */
880         unsigned char HorizDisplayEnd;  /* CRT-Controller:01h */
881         unsigned char StartHorizRetrace;        /* CRT-Controller:04h */
882         unsigned char EndHorizRetrace;  /* CRT-Controller:05h */
883         unsigned char Overflow; /* CRT-Controller:07h */
884         unsigned char StartVertRetrace; /* CRT-Controller:10h */
885         unsigned char EndVertRetrace;   /* CRT-Controller:11h */
886         unsigned char ModeControl;      /* CRT-Controller:17h */
887         unsigned char ClockingMode;     /* Seq-Controller:01h */
888 } vga_state;
889
890 static void vga_vesa_blank(struct vgastate *state, int mode)
891 {
892         /* save original values of VGA controller registers */
893         if (!vga_vesa_blanked) {
894                 spin_lock_irq(&vga_lock);
895                 vga_state.SeqCtrlIndex = vga_r(state->vgabase, VGA_SEQ_I);
896                 vga_state.CrtCtrlIndex = inb_p(vga_video_port_reg);
897                 vga_state.CrtMiscIO = vga_r(state->vgabase, VGA_MIS_R);
898                 spin_unlock_irq(&vga_lock);
899
900                 outb_p(0x00, vga_video_port_reg);       /* HorizontalTotal */
901                 vga_state.HorizontalTotal = inb_p(vga_video_port_val);
902                 outb_p(0x01, vga_video_port_reg);       /* HorizDisplayEnd */
903                 vga_state.HorizDisplayEnd = inb_p(vga_video_port_val);
904                 outb_p(0x04, vga_video_port_reg);       /* StartHorizRetrace */
905                 vga_state.StartHorizRetrace = inb_p(vga_video_port_val);
906                 outb_p(0x05, vga_video_port_reg);       /* EndHorizRetrace */
907                 vga_state.EndHorizRetrace = inb_p(vga_video_port_val);
908                 outb_p(0x07, vga_video_port_reg);       /* Overflow */
909                 vga_state.Overflow = inb_p(vga_video_port_val);
910                 outb_p(0x10, vga_video_port_reg);       /* StartVertRetrace */
911                 vga_state.StartVertRetrace = inb_p(vga_video_port_val);
912                 outb_p(0x11, vga_video_port_reg);       /* EndVertRetrace */
913                 vga_state.EndVertRetrace = inb_p(vga_video_port_val);
914                 outb_p(0x17, vga_video_port_reg);       /* ModeControl */
915                 vga_state.ModeControl = inb_p(vga_video_port_val);
916                 vga_state.ClockingMode = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
917         }
918
919         /* assure that video is enabled */
920         /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
921         spin_lock_irq(&vga_lock);
922         vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode | 0x20);
923
924         /* test for vertical retrace in process.... */
925         if ((vga_state.CrtMiscIO & 0x80) == 0x80)
926                 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO & 0xEF);
927
928         /*
929          * Set <End of vertical retrace> to minimum (0) and
930          * <Start of vertical Retrace> to maximum (incl. overflow)
931          * Result: turn off vertical sync (VSync) pulse.
932          */
933         if (mode & VESA_VSYNC_SUSPEND) {
934                 outb_p(0x10, vga_video_port_reg);       /* StartVertRetrace */
935                 outb_p(0xff, vga_video_port_val);       /* maximum value */
936                 outb_p(0x11, vga_video_port_reg);       /* EndVertRetrace */
937                 outb_p(0x40, vga_video_port_val);       /* minimum (bits 0..3)  */
938                 outb_p(0x07, vga_video_port_reg);       /* Overflow */
939                 outb_p(vga_state.Overflow | 0x84, vga_video_port_val);  /* bits 9,10 of vert. retrace */
940         }
941
942         if (mode & VESA_HSYNC_SUSPEND) {
943                 /*
944                  * Set <End of horizontal retrace> to minimum (0) and
945                  *  <Start of horizontal Retrace> to maximum
946                  * Result: turn off horizontal sync (HSync) pulse.
947                  */
948                 outb_p(0x04, vga_video_port_reg);       /* StartHorizRetrace */
949                 outb_p(0xff, vga_video_port_val);       /* maximum */
950                 outb_p(0x05, vga_video_port_reg);       /* EndHorizRetrace */
951                 outb_p(0x00, vga_video_port_val);       /* minimum (0) */
952         }
953
954         /* restore both index registers */
955         vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);
956         outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg);
957         spin_unlock_irq(&vga_lock);
958 }
959
960 static void vga_vesa_unblank(struct vgastate *state)
961 {
962         /* restore original values of VGA controller registers */
963         spin_lock_irq(&vga_lock);
964         vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO);
965
966         outb_p(0x00, vga_video_port_reg);       /* HorizontalTotal */
967         outb_p(vga_state.HorizontalTotal, vga_video_port_val);
968         outb_p(0x01, vga_video_port_reg);       /* HorizDisplayEnd */
969         outb_p(vga_state.HorizDisplayEnd, vga_video_port_val);
970         outb_p(0x04, vga_video_port_reg);       /* StartHorizRetrace */
971         outb_p(vga_state.StartHorizRetrace, vga_video_port_val);
972         outb_p(0x05, vga_video_port_reg);       /* EndHorizRetrace */
973         outb_p(vga_state.EndHorizRetrace, vga_video_port_val);
974         outb_p(0x07, vga_video_port_reg);       /* Overflow */
975         outb_p(vga_state.Overflow, vga_video_port_val);
976         outb_p(0x10, vga_video_port_reg);       /* StartVertRetrace */
977         outb_p(vga_state.StartVertRetrace, vga_video_port_val);
978         outb_p(0x11, vga_video_port_reg);       /* EndVertRetrace */
979         outb_p(vga_state.EndVertRetrace, vga_video_port_val);
980         outb_p(0x17, vga_video_port_reg);       /* ModeControl */
981         outb_p(vga_state.ModeControl, vga_video_port_val);
982         /* ClockingMode */
983         vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode);
984
985         /* restore index/control registers */
986         vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);
987         outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg);
988         spin_unlock_irq(&vga_lock);
989 }
990
991 static void vga_pal_blank(struct vgastate *state)
992 {
993         int i;
994
995         vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
996         for (i = 0; i < 16; i++) {
997                 vga_w(state->vgabase, VGA_PEL_IW, i);
998                 vga_w(state->vgabase, VGA_PEL_D, 0);
999                 vga_w(state->vgabase, VGA_PEL_D, 0);
1000                 vga_w(state->vgabase, VGA_PEL_D, 0);
1001         }
1002 }
1003
1004 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch)
1005 {
1006         switch (blank) {
1007         case 0:         /* Unblank */
1008                 if (vga_vesa_blanked) {
1009                         vga_vesa_unblank(&state);
1010                         vga_vesa_blanked = 0;
1011                 }
1012                 if (vga_palette_blanked) {
1013                         vga_set_palette(c, color_table);
1014                         vga_palette_blanked = 0;
1015                         return 0;
1016                 }
1017                 vga_is_gfx = 0;
1018                 /* Tell console.c that it has to restore the screen itself */
1019                 return 1;
1020         case 1:         /* Normal blanking */
1021         case -1:        /* Obsolete */
1022                 if (!mode_switch && vga_video_type == VIDEO_TYPE_VGAC) {
1023                         vga_pal_blank(&state);
1024                         vga_palette_blanked = 1;
1025                         return 0;
1026                 }
1027                 vgacon_set_origin(c);
1028                 scr_memsetw((void *) vga_vram_base, BLANK,
1029                             c->vc_screenbuf_size);
1030                 if (mode_switch)
1031                         vga_is_gfx = 1;
1032                 return 1;
1033         default:                /* VESA blanking */
1034                 if (vga_video_type == VIDEO_TYPE_VGAC) {
1035                         vga_vesa_blank(&state, blank - 1);
1036                         vga_vesa_blanked = blank;
1037                 }
1038                 return 0;
1039         }
1040 }
1041
1042 /*
1043  * PIO_FONT support.
1044  *
1045  * The font loading code goes back to the codepage package by
1046  * Joel Hoffman (joel@wam.umd.edu). (He reports that the original
1047  * reference is: "From: p. 307 of _Programmer's Guide to PC & PS/2
1048  * Video Systems_ by Richard Wilton. 1987.  Microsoft Press".)
1049  *
1050  * Change for certain monochrome monitors by Yury Shevchuck
1051  * (sizif@botik.yaroslavl.su).
1052  */
1053
1054 #ifdef CAN_LOAD_EGA_FONTS
1055
1056 #define colourmap 0xa0000
1057 /* Pauline Middelink <middelin@polyware.iaf.nl> reports that we
1058    should use 0xA0000 for the bwmap as well.. */
1059 #define blackwmap 0xa0000
1060 #define cmapsz 8192
1061
1062 static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512)
1063 {
1064         unsigned short video_port_status = vga_video_port_reg + 6;
1065         int font_select = 0x00, beg, i;
1066         char *charmap;
1067         
1068         if (vga_video_type != VIDEO_TYPE_EGAM) {
1069                 charmap = (char *) VGA_MAP_MEM(colourmap, 0);
1070                 beg = 0x0e;
1071 #ifdef VGA_CAN_DO_64KB
1072                 if (vga_video_type == VIDEO_TYPE_VGAC)
1073                         beg = 0x06;
1074 #endif
1075         } else {
1076                 charmap = (char *) VGA_MAP_MEM(blackwmap, 0);
1077                 beg = 0x0a;
1078         }
1079
1080 #ifdef BROKEN_GRAPHICS_PROGRAMS
1081         /*
1082          * All fonts are loaded in slot 0 (0:1 for 512 ch)
1083          */
1084
1085         if (!arg)
1086                 return -EINVAL; /* Return to default font not supported */
1087
1088         vga_font_is_default = 0;
1089         font_select = ch512 ? 0x04 : 0x00;
1090 #else
1091         /*
1092          * The default font is kept in slot 0 and is never touched.
1093          * A custom font is loaded in slot 2 (256 ch) or 2:3 (512 ch)
1094          */
1095
1096         if (set) {
1097                 vga_font_is_default = !arg;
1098                 if (!arg)
1099                         ch512 = 0;      /* Default font is always 256 */
1100                 font_select = arg ? (ch512 ? 0x0e : 0x0a) : 0x00;
1101         }
1102
1103         if (!vga_font_is_default)
1104                 charmap += 4 * cmapsz;
1105 #endif
1106
1107         spin_lock_irq(&vga_lock);
1108         /* First, the Sequencer */
1109         vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
1110         /* CPU writes only to map 2 */
1111         vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x04);    
1112         /* Sequential addressing */
1113         vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x07);    
1114         /* Clear synchronous reset */
1115         vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
1116
1117         /* Now, the graphics controller, select map 2 */
1118         vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x02);             
1119         /* disable odd-even addressing */
1120         vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x00);
1121         /* map start at A000:0000 */
1122         vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x00);
1123         spin_unlock_irq(&vga_lock);
1124
1125         if (arg) {
1126                 if (set)
1127                         for (i = 0; i < cmapsz; i++)
1128                                 vga_writeb(arg[i], charmap + i);
1129                 else
1130                         for (i = 0; i < cmapsz; i++)
1131                                 arg[i] = vga_readb(charmap + i);
1132
1133                 /*
1134                  * In 512-character mode, the character map is not contiguous if
1135                  * we want to remain EGA compatible -- which we do
1136                  */
1137
1138                 if (ch512) {
1139                         charmap += 2 * cmapsz;
1140                         arg += cmapsz;
1141                         if (set)
1142                                 for (i = 0; i < cmapsz; i++)
1143                                         vga_writeb(arg[i], charmap + i);
1144                         else
1145                                 for (i = 0; i < cmapsz; i++)
1146                                         arg[i] = vga_readb(charmap + i);
1147                 }
1148         }
1149
1150         spin_lock_irq(&vga_lock);
1151         /* First, the sequencer, Synchronous reset */
1152         vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01);  
1153         /* CPU writes to maps 0 and 1 */
1154         vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x03);
1155         /* odd-even addressing */
1156         vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x03);
1157         /* Character Map Select */
1158         if (set)
1159                 vga_wseq(state->vgabase, VGA_SEQ_CHARACTER_MAP, font_select);
1160         /* clear synchronous reset */
1161         vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
1162
1163         /* Now, the graphics controller, select map 0 for CPU */
1164         vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x00);
1165         /* enable even-odd addressing */
1166         vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x10);
1167         /* map starts at b800:0 or b000:0 */
1168         vga_wgfx(state->vgabase, VGA_GFX_MISC, beg);
1169
1170         /* if 512 char mode is already enabled don't re-enable it. */
1171         if ((set) && (ch512 != vga_512_chars)) {
1172                 /* attribute controller */
1173                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1174                         struct vc_data *c = vc_cons[i].d;
1175                         if (c && c->vc_sw == &vga_con)
1176                                 c->vc_hi_font_mask = ch512 ? 0x0800 : 0;
1177                 }
1178                 vga_512_chars = ch512;
1179                 /* 256-char: enable intensity bit
1180                    512-char: disable intensity bit */
1181                 inb_p(video_port_status);       /* clear address flip-flop */
1182                 /* color plane enable register */
1183                 vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f);
1184                 /* Wilton (1987) mentions the following; I don't know what
1185                    it means, but it works, and it appears necessary */
1186                 inb_p(video_port_status);
1187                 vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0);    
1188         }
1189         spin_unlock_irq(&vga_lock);
1190         return 0;
1191 }
1192
1193 /*
1194  * Adjust the screen to fit a font of a certain height
1195  */
1196 static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight)
1197 {
1198         unsigned char ovr, vde, fsr;
1199         int rows, maxscan, i;
1200
1201         rows = vc->vc_scan_lines / fontheight;  /* Number of video rows we end up with */
1202         maxscan = rows * fontheight - 1;        /* Scan lines to actually display-1 */
1203
1204         /* Reprogram the CRTC for the new font size
1205            Note: the attempt to read the overflow register will fail
1206            on an EGA, but using 0xff for the previous value appears to
1207            be OK for EGA text modes in the range 257-512 scan lines, so I
1208            guess we don't need to worry about it.
1209
1210            The same applies for the spill bits in the font size and cursor
1211            registers; they are write-only on EGA, but it appears that they
1212            are all don't care bits on EGA, so I guess it doesn't matter. */
1213
1214         spin_lock_irq(&vga_lock);
1215         outb_p(0x07, vga_video_port_reg);       /* CRTC overflow register */
1216         ovr = inb_p(vga_video_port_val);
1217         outb_p(0x09, vga_video_port_reg);       /* Font size register */
1218         fsr = inb_p(vga_video_port_val);
1219         spin_unlock_irq(&vga_lock);
1220
1221         vde = maxscan & 0xff;   /* Vertical display end reg */
1222         ovr = (ovr & 0xbd) +    /* Overflow register */
1223             ((maxscan & 0x100) >> 7) + ((maxscan & 0x200) >> 3);
1224         fsr = (fsr & 0xe0) + (fontheight - 1);  /*  Font size register */
1225
1226         spin_lock_irq(&vga_lock);
1227         outb_p(0x07, vga_video_port_reg);       /* CRTC overflow register */
1228         outb_p(ovr, vga_video_port_val);
1229         outb_p(0x09, vga_video_port_reg);       /* Font size */
1230         outb_p(fsr, vga_video_port_val);
1231         outb_p(0x12, vga_video_port_reg);       /* Vertical display limit */
1232         outb_p(vde, vga_video_port_val);
1233         spin_unlock_irq(&vga_lock);
1234         vga_video_font_height = fontheight;
1235
1236         for (i = 0; i < MAX_NR_CONSOLES; i++) {
1237                 struct vc_data *c = vc_cons[i].d;
1238
1239                 if (c && c->vc_sw == &vga_con) {
1240                         if (CON_IS_VISIBLE(c)) {
1241                                 /* void size to cause regs to be rewritten */
1242                                 cursor_size_lastfrom = 0;
1243                                 cursor_size_lastto = 0;
1244                                 c->vc_sw->con_cursor(c, CM_DRAW);
1245                         }
1246                         c->vc_font.height = fontheight;
1247                         vc_resize(c, 0, rows);  /* Adjust console size */
1248                 }
1249         }
1250         return 0;
1251 }
1252
1253 static int vgacon_font_set(struct vc_data *c, struct console_font *font, unsigned flags)
1254 {
1255         unsigned charcount = font->charcount;
1256         int rc;
1257
1258         if (vga_video_type < VIDEO_TYPE_EGAM)
1259                 return -EINVAL;
1260
1261         if (font->width != VGA_FONTWIDTH ||
1262             (charcount != 256 && charcount != 512))
1263                 return -EINVAL;
1264
1265         rc = vgacon_do_font_op(&state, font->data, 1, charcount == 512);
1266         if (rc)
1267                 return rc;
1268
1269         if (!(flags & KD_FONT_FLAG_DONT_RECALC))
1270                 rc = vgacon_adjust_height(c, font->height);
1271         return rc;
1272 }
1273
1274 static int vgacon_font_get(struct vc_data *c, struct console_font *font)
1275 {
1276         if (vga_video_type < VIDEO_TYPE_EGAM)
1277                 return -EINVAL;
1278
1279         font->width = VGA_FONTWIDTH;
1280         font->height = c->vc_font.height;
1281         font->charcount = vga_512_chars ? 512 : 256;
1282         if (!font->data)
1283                 return 0;
1284         return vgacon_do_font_op(&state, font->data, 0, vga_512_chars);
1285 }
1286
1287 #else
1288
1289 #define vgacon_font_set NULL
1290 #define vgacon_font_get NULL
1291
1292 #endif
1293
1294 static int vgacon_resize(struct vc_data *c, unsigned int width,
1295                          unsigned int height, unsigned int user)
1296 {
1297         if (width % 2 || width > screen_info.orig_video_cols ||
1298             height > (screen_info.orig_video_lines * vga_default_font_height)/
1299             c->vc_font.height)
1300                 /* let svgatextmode tinker with video timings and
1301                    return success */
1302                 return (user) ? 0 : -EINVAL;
1303
1304         if (CON_IS_VISIBLE(c) && !vga_is_gfx) /* who knows */
1305                 vgacon_doresize(c, width, height);
1306         return 0;
1307 }
1308
1309 static int vgacon_set_origin(struct vc_data *c)
1310 {
1311         if (vga_is_gfx ||       /* We don't play origin tricks in graphic modes */
1312             (console_blanked && !vga_palette_blanked))  /* Nor we write to blanked screens */
1313                 return 0;
1314         c->vc_origin = c->vc_visible_origin = vga_vram_base;
1315         vga_set_mem_top(c);
1316         vga_rolled_over = 0;
1317         return 1;
1318 }
1319
1320 static void vgacon_save_screen(struct vc_data *c)
1321 {
1322         static int vga_bootup_console = 0;
1323
1324         if (!vga_bootup_console) {
1325                 /* This is a gross hack, but here is the only place we can
1326                  * set bootup console parameters without messing up generic
1327                  * console initialization routines.
1328                  */
1329                 vga_bootup_console = 1;
1330                 c->vc_x = screen_info.orig_x;
1331                 c->vc_y = screen_info.orig_y;
1332         }
1333
1334         /* We can't copy in more than the size of the video buffer,
1335          * or we'll be copying in VGA BIOS */
1336
1337         if (!vga_is_gfx)
1338                 scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin,
1339                             c->vc_screenbuf_size > vga_vram_size ? vga_vram_size : c->vc_screenbuf_size);
1340 }
1341
1342 static int vgacon_scroll(struct vc_data *c, int t, int b, int dir,
1343                          int lines)
1344 {
1345         unsigned long oldo;
1346         unsigned int delta;
1347
1348         if (t || b != c->vc_rows || vga_is_gfx || c->vc_mode != KD_TEXT)
1349                 return 0;
1350
1351         if (!vga_hardscroll_enabled || lines >= c->vc_rows / 2)
1352                 return 0;
1353
1354         vgacon_restore_screen(c);
1355         oldo = c->vc_origin;
1356         delta = lines * c->vc_size_row;
1357         if (dir == SM_UP) {
1358                 vgacon_scrollback_update(c, t, lines);
1359                 if (c->vc_scr_end + delta >= vga_vram_end) {
1360                         scr_memcpyw((u16 *) vga_vram_base,
1361                                     (u16 *) (oldo + delta),
1362                                     c->vc_screenbuf_size - delta);
1363                         c->vc_origin = vga_vram_base;
1364                         vga_rolled_over = oldo - vga_vram_base;
1365                 } else
1366                         c->vc_origin += delta;
1367                 scr_memsetw((u16 *) (c->vc_origin + c->vc_screenbuf_size -
1368                                      delta), c->vc_video_erase_char,
1369                             delta);
1370         } else {
1371                 if (oldo - delta < vga_vram_base) {
1372                         scr_memmovew((u16 *) (vga_vram_end -
1373                                               c->vc_screenbuf_size +
1374                                               delta), (u16 *) oldo,
1375                                      c->vc_screenbuf_size - delta);
1376                         c->vc_origin = vga_vram_end - c->vc_screenbuf_size;
1377                         vga_rolled_over = 0;
1378                 } else
1379                         c->vc_origin -= delta;
1380                 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1381                 scr_memsetw((u16 *) (c->vc_origin), c->vc_video_erase_char,
1382                             delta);
1383         }
1384         c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1385         c->vc_visible_origin = c->vc_origin;
1386         vga_set_mem_top(c);
1387         c->vc_pos = (c->vc_pos - oldo) + c->vc_origin;
1388         return 1;
1389 }
1390
1391
1392 /*
1393  *  The console `switch' structure for the VGA based console
1394  */
1395
1396 static int vgacon_dummy(struct vc_data *c)
1397 {
1398         return 0;
1399 }
1400
1401 #define DUMMY (void *) vgacon_dummy
1402
1403 const struct consw vga_con = {
1404         .owner = THIS_MODULE,
1405         .con_startup = vgacon_startup,
1406         .con_init = vgacon_init,
1407         .con_deinit = vgacon_deinit,
1408         .con_clear = DUMMY,
1409         .con_putc = DUMMY,
1410         .con_putcs = DUMMY,
1411         .con_cursor = vgacon_cursor,
1412         .con_scroll = vgacon_scroll,
1413         .con_bmove = DUMMY,
1414         .con_switch = vgacon_switch,
1415         .con_blank = vgacon_blank,
1416         .con_font_set = vgacon_font_set,
1417         .con_font_get = vgacon_font_get,
1418         .con_resize = vgacon_resize,
1419         .con_set_palette = vgacon_set_palette,
1420         .con_scrolldelta = vgacon_scrolldelta,
1421         .con_set_origin = vgacon_set_origin,
1422         .con_save_screen = vgacon_save_screen,
1423         .con_build_attr = vgacon_build_attr,
1424         .con_invert_region = vgacon_invert_region,
1425 };
1426
1427 MODULE_LICENSE("GPL");