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Merge branch 'drm-fixes-3.18' of git://people.freedesktop.org/~agd5f/linux into drm...
[deliverable/linux.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/sched.h>
46 #include <linux/selection.h>
47 #include <linux/spinlock.h>
48 #include <linux/ioport.h>
49 #include <linux/init.h>
50 #include <linux/screen_info.h>
51 #include <video/vga.h>
52 #include <asm/io.h>
53
54 static DEFINE_RAW_SPINLOCK(vga_lock);
55 static int cursor_size_lastfrom;
56 static int cursor_size_lastto;
57 static u32 vgacon_xres;
58 static u32 vgacon_yres;
59 static struct vgastate state;
60
61 #define BLANK 0x0020
62
63 #define CAN_LOAD_EGA_FONTS /* undefine if the user must not do this */
64 #define CAN_LOAD_PALETTE /* undefine if the user must not do this */
65
66 /* You really do _NOT_ want to define this, unless you have buggy
67 * Trident VGA which will resize cursor when moving it between column
68 * 15 & 16. If you define this and your VGA is OK, inverse bug will
69 * appear.
70 */
71 #undef TRIDENT_GLITCH
72 #define VGA_FONTWIDTH 8 /* VGA does not support fontwidths != 8 */
73 /*
74 * Interface used by the world
75 */
76
77 static const char *vgacon_startup(void);
78 static void vgacon_init(struct vc_data *c, int init);
79 static void vgacon_deinit(struct vc_data *c);
80 static void vgacon_cursor(struct vc_data *c, int mode);
81 static int vgacon_switch(struct vc_data *c);
82 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch);
83 static int vgacon_set_palette(struct vc_data *vc, unsigned char *table);
84 static int vgacon_scrolldelta(struct vc_data *c, int lines);
85 static int vgacon_set_origin(struct vc_data *c);
86 static void vgacon_save_screen(struct vc_data *c);
87 static int vgacon_scroll(struct vc_data *c, int t, int b, int dir,
88 int lines);
89 static void vgacon_invert_region(struct vc_data *c, u16 * p, int count);
90 static struct uni_pagedir *vgacon_uni_pagedir;
91 static int vgacon_refcount;
92
93 /* Description of the hardware situation */
94 static int vga_init_done __read_mostly;
95 static unsigned long vga_vram_base __read_mostly; /* Base of video memory */
96 static unsigned long vga_vram_end __read_mostly; /* End of video memory */
97 static unsigned int vga_vram_size __read_mostly; /* Size of video memory */
98 static u16 vga_video_port_reg __read_mostly; /* Video register select port */
99 static u16 vga_video_port_val __read_mostly; /* Video register value port */
100 static unsigned int vga_video_num_columns; /* Number of text columns */
101 static unsigned int vga_video_num_lines; /* Number of text lines */
102 static int vga_can_do_color __read_mostly; /* Do we support colors? */
103 static unsigned int vga_default_font_height __read_mostly; /* Height of default screen font */
104 static unsigned char vga_video_type __read_mostly; /* Card type */
105 static unsigned char vga_hardscroll_enabled __read_mostly;
106 static unsigned char vga_hardscroll_user_enable __read_mostly = 1;
107 static unsigned char vga_font_is_default = 1;
108 static int vga_vesa_blanked;
109 static int vga_palette_blanked;
110 static int vga_is_gfx;
111 static int vga_512_chars;
112 static int vga_video_font_height;
113 static int vga_scan_lines __read_mostly;
114 static unsigned int vga_rolled_over;
115
116 static int vgacon_text_mode_force;
117
118 bool vgacon_text_force(void)
119 {
120 return vgacon_text_mode_force ? true : false;
121 }
122 EXPORT_SYMBOL(vgacon_text_force);
123
124 static int __init text_mode(char *str)
125 {
126 vgacon_text_mode_force = 1;
127 return 1;
128 }
129
130 /* force text mode - used by kernel modesetting */
131 __setup("nomodeset", text_mode);
132
133 static int __init no_scroll(char *str)
134 {
135 /*
136 * Disabling scrollback is required for the Braillex ib80-piezo
137 * Braille reader made by F.H. Papenmeier (Germany).
138 * Use the "no-scroll" bootflag.
139 */
140 vga_hardscroll_user_enable = vga_hardscroll_enabled = 0;
141 return 1;
142 }
143
144 __setup("no-scroll", no_scroll);
145
146 /*
147 * By replacing the four outb_p with two back to back outw, we can reduce
148 * the window of opportunity to see text mislocated to the RHS of the
149 * console during heavy scrolling activity. However there is the remote
150 * possibility that some pre-dinosaur hardware won't like the back to back
151 * I/O. Since the Xservers get away with it, we should be able to as well.
152 */
153 static inline void write_vga(unsigned char reg, unsigned int val)
154 {
155 unsigned int v1, v2;
156 unsigned long flags;
157
158 /*
159 * ddprintk might set the console position from interrupt
160 * handlers, thus the write has to be IRQ-atomic.
161 */
162 raw_spin_lock_irqsave(&vga_lock, flags);
163
164 #ifndef SLOW_VGA
165 v1 = reg + (val & 0xff00);
166 v2 = reg + 1 + ((val << 8) & 0xff00);
167 outw(v1, vga_video_port_reg);
168 outw(v2, vga_video_port_reg);
169 #else
170 outb_p(reg, vga_video_port_reg);
171 outb_p(val >> 8, vga_video_port_val);
172 outb_p(reg + 1, vga_video_port_reg);
173 outb_p(val & 0xff, vga_video_port_val);
174 #endif
175 raw_spin_unlock_irqrestore(&vga_lock, flags);
176 }
177
178 static inline void vga_set_mem_top(struct vc_data *c)
179 {
180 write_vga(12, (c->vc_visible_origin - vga_vram_base) / 2);
181 }
182
183 #ifdef CONFIG_VGACON_SOFT_SCROLLBACK
184 /* software scrollback */
185 static void *vgacon_scrollback;
186 static int vgacon_scrollback_tail;
187 static int vgacon_scrollback_size;
188 static int vgacon_scrollback_rows;
189 static int vgacon_scrollback_cnt;
190 static int vgacon_scrollback_cur;
191 static int vgacon_scrollback_save;
192 static int vgacon_scrollback_restore;
193
194 static void vgacon_scrollback_init(int pitch)
195 {
196 int rows = CONFIG_VGACON_SOFT_SCROLLBACK_SIZE * 1024/pitch;
197
198 if (vgacon_scrollback) {
199 vgacon_scrollback_cnt = 0;
200 vgacon_scrollback_tail = 0;
201 vgacon_scrollback_cur = 0;
202 vgacon_scrollback_rows = rows - 1;
203 vgacon_scrollback_size = rows * pitch;
204 }
205 }
206
207 static void vgacon_scrollback_startup(void)
208 {
209 vgacon_scrollback = kcalloc(CONFIG_VGACON_SOFT_SCROLLBACK_SIZE, 1024, GFP_NOWAIT);
210 vgacon_scrollback_init(vga_video_num_columns * 2);
211 }
212
213 static void vgacon_scrollback_update(struct vc_data *c, int t, int count)
214 {
215 void *p;
216
217 if (!vgacon_scrollback_size || c->vc_num != fg_console)
218 return;
219
220 p = (void *) (c->vc_origin + t * c->vc_size_row);
221
222 while (count--) {
223 scr_memcpyw(vgacon_scrollback + vgacon_scrollback_tail,
224 p, c->vc_size_row);
225 vgacon_scrollback_cnt++;
226 p += c->vc_size_row;
227 vgacon_scrollback_tail += c->vc_size_row;
228
229 if (vgacon_scrollback_tail >= vgacon_scrollback_size)
230 vgacon_scrollback_tail = 0;
231
232 if (vgacon_scrollback_cnt > vgacon_scrollback_rows)
233 vgacon_scrollback_cnt = vgacon_scrollback_rows;
234
235 vgacon_scrollback_cur = vgacon_scrollback_cnt;
236 }
237 }
238
239 static void vgacon_restore_screen(struct vc_data *c)
240 {
241 vgacon_scrollback_save = 0;
242
243 if (!vga_is_gfx && !vgacon_scrollback_restore) {
244 scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,
245 c->vc_screenbuf_size > vga_vram_size ?
246 vga_vram_size : c->vc_screenbuf_size);
247 vgacon_scrollback_restore = 1;
248 vgacon_scrollback_cur = vgacon_scrollback_cnt;
249 }
250 }
251
252 static int vgacon_scrolldelta(struct vc_data *c, int lines)
253 {
254 int start, end, count, soff;
255
256 if (!lines) {
257 c->vc_visible_origin = c->vc_origin;
258 vga_set_mem_top(c);
259 return 1;
260 }
261
262 if (!vgacon_scrollback)
263 return 1;
264
265 if (!vgacon_scrollback_save) {
266 vgacon_cursor(c, CM_ERASE);
267 vgacon_save_screen(c);
268 vgacon_scrollback_save = 1;
269 }
270
271 vgacon_scrollback_restore = 0;
272 start = vgacon_scrollback_cur + lines;
273 end = start + abs(lines);
274
275 if (start < 0)
276 start = 0;
277
278 if (start > vgacon_scrollback_cnt)
279 start = vgacon_scrollback_cnt;
280
281 if (end < 0)
282 end = 0;
283
284 if (end > vgacon_scrollback_cnt)
285 end = vgacon_scrollback_cnt;
286
287 vgacon_scrollback_cur = start;
288 count = end - start;
289 soff = vgacon_scrollback_tail - ((vgacon_scrollback_cnt - end) *
290 c->vc_size_row);
291 soff -= count * c->vc_size_row;
292
293 if (soff < 0)
294 soff += vgacon_scrollback_size;
295
296 count = vgacon_scrollback_cnt - start;
297
298 if (count > c->vc_rows)
299 count = c->vc_rows;
300
301 if (count) {
302 int copysize;
303
304 int diff = c->vc_rows - count;
305 void *d = (void *) c->vc_origin;
306 void *s = (void *) c->vc_screenbuf;
307
308 count *= c->vc_size_row;
309 /* how much memory to end of buffer left? */
310 copysize = min(count, vgacon_scrollback_size - soff);
311 scr_memcpyw(d, vgacon_scrollback + soff, copysize);
312 d += copysize;
313 count -= copysize;
314
315 if (count) {
316 scr_memcpyw(d, vgacon_scrollback, count);
317 d += count;
318 }
319
320 if (diff)
321 scr_memcpyw(d, s, diff * c->vc_size_row);
322 } else
323 vgacon_cursor(c, CM_MOVE);
324
325 return 1;
326 }
327 #else
328 #define vgacon_scrollback_startup(...) do { } while (0)
329 #define vgacon_scrollback_init(...) do { } while (0)
330 #define vgacon_scrollback_update(...) do { } while (0)
331
332 static void vgacon_restore_screen(struct vc_data *c)
333 {
334 if (c->vc_origin != c->vc_visible_origin)
335 vgacon_scrolldelta(c, 0);
336 }
337
338 static int vgacon_scrolldelta(struct vc_data *c, int lines)
339 {
340 if (!lines) /* Turn scrollback off */
341 c->vc_visible_origin = c->vc_origin;
342 else {
343 int margin = c->vc_size_row * 4;
344 int ul, we, p, st;
345
346 if (vga_rolled_over >
347 (c->vc_scr_end - vga_vram_base) + margin) {
348 ul = c->vc_scr_end - vga_vram_base;
349 we = vga_rolled_over + c->vc_size_row;
350 } else {
351 ul = 0;
352 we = vga_vram_size;
353 }
354 p = (c->vc_visible_origin - vga_vram_base - ul + we) % we +
355 lines * c->vc_size_row;
356 st = (c->vc_origin - vga_vram_base - ul + we) % we;
357 if (st < 2 * margin)
358 margin = 0;
359 if (p < margin)
360 p = 0;
361 if (p > st - margin)
362 p = st;
363 c->vc_visible_origin = vga_vram_base + (p + ul) % we;
364 }
365 vga_set_mem_top(c);
366 return 1;
367 }
368 #endif /* CONFIG_VGACON_SOFT_SCROLLBACK */
369
370 static const char *vgacon_startup(void)
371 {
372 const char *display_desc = NULL;
373 u16 saved1, saved2;
374 volatile u16 *p;
375
376 if (screen_info.orig_video_isVGA == VIDEO_TYPE_VLFB ||
377 screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
378 no_vga:
379 #ifdef CONFIG_DUMMY_CONSOLE
380 conswitchp = &dummy_con;
381 return conswitchp->con_startup();
382 #else
383 return NULL;
384 #endif
385 }
386
387 /* boot_params.screen_info initialized? */
388 if ((screen_info.orig_video_mode == 0) &&
389 (screen_info.orig_video_lines == 0) &&
390 (screen_info.orig_video_cols == 0))
391 goto no_vga;
392
393 /* VGA16 modes are not handled by VGACON */
394 if ((screen_info.orig_video_mode == 0x0D) || /* 320x200/4 */
395 (screen_info.orig_video_mode == 0x0E) || /* 640x200/4 */
396 (screen_info.orig_video_mode == 0x10) || /* 640x350/4 */
397 (screen_info.orig_video_mode == 0x12) || /* 640x480/4 */
398 (screen_info.orig_video_mode == 0x6A)) /* 800x600/4 (VESA) */
399 goto no_vga;
400
401 vga_video_num_lines = screen_info.orig_video_lines;
402 vga_video_num_columns = screen_info.orig_video_cols;
403 state.vgabase = NULL;
404
405 if (screen_info.orig_video_mode == 7) {
406 /* Monochrome display */
407 vga_vram_base = 0xb0000;
408 vga_video_port_reg = VGA_CRT_IM;
409 vga_video_port_val = VGA_CRT_DM;
410 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
411 static struct resource ega_console_resource =
412 { .name = "ega", .start = 0x3B0, .end = 0x3BF };
413 vga_video_type = VIDEO_TYPE_EGAM;
414 vga_vram_size = 0x8000;
415 display_desc = "EGA+";
416 request_resource(&ioport_resource,
417 &ega_console_resource);
418 } else {
419 static struct resource mda1_console_resource =
420 { .name = "mda", .start = 0x3B0, .end = 0x3BB };
421 static struct resource mda2_console_resource =
422 { .name = "mda", .start = 0x3BF, .end = 0x3BF };
423 vga_video_type = VIDEO_TYPE_MDA;
424 vga_vram_size = 0x2000;
425 display_desc = "*MDA";
426 request_resource(&ioport_resource,
427 &mda1_console_resource);
428 request_resource(&ioport_resource,
429 &mda2_console_resource);
430 vga_video_font_height = 14;
431 }
432 } else {
433 /* If not, it is color. */
434 vga_can_do_color = 1;
435 vga_vram_base = 0xb8000;
436 vga_video_port_reg = VGA_CRT_IC;
437 vga_video_port_val = VGA_CRT_DC;
438 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
439 int i;
440
441 vga_vram_size = 0x8000;
442
443 if (!screen_info.orig_video_isVGA) {
444 static struct resource ega_console_resource
445 = { .name = "ega", .start = 0x3C0, .end = 0x3DF };
446 vga_video_type = VIDEO_TYPE_EGAC;
447 display_desc = "EGA";
448 request_resource(&ioport_resource,
449 &ega_console_resource);
450 } else {
451 static struct resource vga_console_resource
452 = { .name = "vga+", .start = 0x3C0, .end = 0x3DF };
453 vga_video_type = VIDEO_TYPE_VGAC;
454 display_desc = "VGA+";
455 request_resource(&ioport_resource,
456 &vga_console_resource);
457
458 #ifdef VGA_CAN_DO_64KB
459 /*
460 * get 64K rather than 32K of video RAM.
461 * This doesn't actually work on all "VGA"
462 * controllers (it seems like setting MM=01
463 * and COE=1 isn't necessarily a good idea)
464 */
465 vga_vram_base = 0xa0000;
466 vga_vram_size = 0x10000;
467 outb_p(6, VGA_GFX_I);
468 outb_p(6, VGA_GFX_D);
469 #endif
470 /*
471 * Normalise the palette registers, to point
472 * the 16 screen colours to the first 16
473 * DAC entries.
474 */
475
476 for (i = 0; i < 16; i++) {
477 inb_p(VGA_IS1_RC);
478 outb_p(i, VGA_ATT_W);
479 outb_p(i, VGA_ATT_W);
480 }
481 outb_p(0x20, VGA_ATT_W);
482
483 /*
484 * Now set the DAC registers back to their
485 * default values
486 */
487 for (i = 0; i < 16; i++) {
488 outb_p(color_table[i], VGA_PEL_IW);
489 outb_p(default_red[i], VGA_PEL_D);
490 outb_p(default_grn[i], VGA_PEL_D);
491 outb_p(default_blu[i], VGA_PEL_D);
492 }
493 }
494 } else {
495 static struct resource cga_console_resource =
496 { .name = "cga", .start = 0x3D4, .end = 0x3D5 };
497 vga_video_type = VIDEO_TYPE_CGA;
498 vga_vram_size = 0x2000;
499 display_desc = "*CGA";
500 request_resource(&ioport_resource,
501 &cga_console_resource);
502 vga_video_font_height = 8;
503 }
504 }
505
506 vga_vram_base = VGA_MAP_MEM(vga_vram_base, vga_vram_size);
507 vga_vram_end = vga_vram_base + vga_vram_size;
508
509 /*
510 * Find out if there is a graphics card present.
511 * Are there smarter methods around?
512 */
513 p = (volatile u16 *) vga_vram_base;
514 saved1 = scr_readw(p);
515 saved2 = scr_readw(p + 1);
516 scr_writew(0xAA55, p);
517 scr_writew(0x55AA, p + 1);
518 if (scr_readw(p) != 0xAA55 || scr_readw(p + 1) != 0x55AA) {
519 scr_writew(saved1, p);
520 scr_writew(saved2, p + 1);
521 goto no_vga;
522 }
523 scr_writew(0x55AA, p);
524 scr_writew(0xAA55, p + 1);
525 if (scr_readw(p) != 0x55AA || scr_readw(p + 1) != 0xAA55) {
526 scr_writew(saved1, p);
527 scr_writew(saved2, p + 1);
528 goto no_vga;
529 }
530 scr_writew(saved1, p);
531 scr_writew(saved2, p + 1);
532
533 if (vga_video_type == VIDEO_TYPE_EGAC
534 || vga_video_type == VIDEO_TYPE_VGAC
535 || vga_video_type == VIDEO_TYPE_EGAM) {
536 vga_hardscroll_enabled = vga_hardscroll_user_enable;
537 vga_default_font_height = screen_info.orig_video_points;
538 vga_video_font_height = screen_info.orig_video_points;
539 /* This may be suboptimal but is a safe bet - go with it */
540 vga_scan_lines =
541 vga_video_font_height * vga_video_num_lines;
542 }
543
544 vgacon_xres = screen_info.orig_video_cols * VGA_FONTWIDTH;
545 vgacon_yres = vga_scan_lines;
546
547 if (!vga_init_done) {
548 vgacon_scrollback_startup();
549 vga_init_done = 1;
550 }
551
552 return display_desc;
553 }
554
555 static void vgacon_init(struct vc_data *c, int init)
556 {
557 struct uni_pagedir *p;
558
559 /*
560 * We cannot be loaded as a module, therefore init is always 1,
561 * but vgacon_init can be called more than once, and init will
562 * not be 1.
563 */
564 c->vc_can_do_color = vga_can_do_color;
565
566 /* set dimensions manually if init != 0 since vc_resize() will fail */
567 if (init) {
568 c->vc_cols = vga_video_num_columns;
569 c->vc_rows = vga_video_num_lines;
570 } else
571 vc_resize(c, vga_video_num_columns, vga_video_num_lines);
572
573 c->vc_scan_lines = vga_scan_lines;
574 c->vc_font.height = vga_video_font_height;
575 c->vc_complement_mask = 0x7700;
576 if (vga_512_chars)
577 c->vc_hi_font_mask = 0x0800;
578 p = *c->vc_uni_pagedir_loc;
579 if (c->vc_uni_pagedir_loc != &vgacon_uni_pagedir) {
580 con_free_unimap(c);
581 c->vc_uni_pagedir_loc = &vgacon_uni_pagedir;
582 vgacon_refcount++;
583 }
584 if (!vgacon_uni_pagedir && p)
585 con_set_default_unimap(c);
586
587 /* Only set the default if the user didn't deliberately override it */
588 if (global_cursor_default == -1)
589 global_cursor_default =
590 !(screen_info.flags & VIDEO_FLAGS_NOCURSOR);
591 }
592
593 static void vgacon_deinit(struct vc_data *c)
594 {
595 /* When closing the active console, reset video origin */
596 if (CON_IS_VISIBLE(c)) {
597 c->vc_visible_origin = vga_vram_base;
598 vga_set_mem_top(c);
599 }
600
601 if (!--vgacon_refcount)
602 con_free_unimap(c);
603 c->vc_uni_pagedir_loc = &c->vc_uni_pagedir;
604 con_set_default_unimap(c);
605 }
606
607 static u8 vgacon_build_attr(struct vc_data *c, u8 color, u8 intensity,
608 u8 blink, u8 underline, u8 reverse, u8 italic)
609 {
610 u8 attr = color;
611
612 if (vga_can_do_color) {
613 if (italic)
614 attr = (attr & 0xF0) | c->vc_itcolor;
615 else if (underline)
616 attr = (attr & 0xf0) | c->vc_ulcolor;
617 else if (intensity == 0)
618 attr = (attr & 0xf0) | c->vc_halfcolor;
619 }
620 if (reverse)
621 attr =
622 ((attr) & 0x88) | ((((attr) >> 4) | ((attr) << 4)) &
623 0x77);
624 if (blink)
625 attr ^= 0x80;
626 if (intensity == 2)
627 attr ^= 0x08;
628 if (!vga_can_do_color) {
629 if (italic)
630 attr = (attr & 0xF8) | 0x02;
631 else if (underline)
632 attr = (attr & 0xf8) | 0x01;
633 else if (intensity == 0)
634 attr = (attr & 0xf0) | 0x08;
635 }
636 return attr;
637 }
638
639 static void vgacon_invert_region(struct vc_data *c, u16 * p, int count)
640 {
641 int col = vga_can_do_color;
642
643 while (count--) {
644 u16 a = scr_readw(p);
645 if (col)
646 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
647 (((a) & 0x0700) << 4);
648 else
649 a ^= ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700;
650 scr_writew(a, p++);
651 }
652 }
653
654 static void vgacon_set_cursor_size(int xpos, int from, int to)
655 {
656 unsigned long flags;
657 int curs, cure;
658
659 #ifdef TRIDENT_GLITCH
660 if (xpos < 16)
661 from--, to--;
662 #endif
663
664 if ((from == cursor_size_lastfrom) && (to == cursor_size_lastto))
665 return;
666 cursor_size_lastfrom = from;
667 cursor_size_lastto = to;
668
669 raw_spin_lock_irqsave(&vga_lock, flags);
670 if (vga_video_type >= VIDEO_TYPE_VGAC) {
671 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg);
672 curs = inb_p(vga_video_port_val);
673 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg);
674 cure = inb_p(vga_video_port_val);
675 } else {
676 curs = 0;
677 cure = 0;
678 }
679
680 curs = (curs & 0xc0) | from;
681 cure = (cure & 0xe0) | to;
682
683 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg);
684 outb_p(curs, vga_video_port_val);
685 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg);
686 outb_p(cure, vga_video_port_val);
687 raw_spin_unlock_irqrestore(&vga_lock, flags);
688 }
689
690 static void vgacon_cursor(struct vc_data *c, int mode)
691 {
692 if (c->vc_mode != KD_TEXT)
693 return;
694
695 vgacon_restore_screen(c);
696
697 switch (mode) {
698 case CM_ERASE:
699 write_vga(14, (c->vc_pos - vga_vram_base) / 2);
700 if (vga_video_type >= VIDEO_TYPE_VGAC)
701 vgacon_set_cursor_size(c->vc_x, 31, 30);
702 else
703 vgacon_set_cursor_size(c->vc_x, 31, 31);
704 break;
705
706 case CM_MOVE:
707 case CM_DRAW:
708 write_vga(14, (c->vc_pos - vga_vram_base) / 2);
709 switch (c->vc_cursor_type & 0x0f) {
710 case CUR_UNDERLINE:
711 vgacon_set_cursor_size(c->vc_x,
712 c->vc_font.height -
713 (c->vc_font.height <
714 10 ? 2 : 3),
715 c->vc_font.height -
716 (c->vc_font.height <
717 10 ? 1 : 2));
718 break;
719 case CUR_TWO_THIRDS:
720 vgacon_set_cursor_size(c->vc_x,
721 c->vc_font.height / 3,
722 c->vc_font.height -
723 (c->vc_font.height <
724 10 ? 1 : 2));
725 break;
726 case CUR_LOWER_THIRD:
727 vgacon_set_cursor_size(c->vc_x,
728 (c->vc_font.height * 2) / 3,
729 c->vc_font.height -
730 (c->vc_font.height <
731 10 ? 1 : 2));
732 break;
733 case CUR_LOWER_HALF:
734 vgacon_set_cursor_size(c->vc_x,
735 c->vc_font.height / 2,
736 c->vc_font.height -
737 (c->vc_font.height <
738 10 ? 1 : 2));
739 break;
740 case CUR_NONE:
741 if (vga_video_type >= VIDEO_TYPE_VGAC)
742 vgacon_set_cursor_size(c->vc_x, 31, 30);
743 else
744 vgacon_set_cursor_size(c->vc_x, 31, 31);
745 break;
746 default:
747 vgacon_set_cursor_size(c->vc_x, 1,
748 c->vc_font.height);
749 break;
750 }
751 break;
752 }
753 }
754
755 static int vgacon_doresize(struct vc_data *c,
756 unsigned int width, unsigned int height)
757 {
758 unsigned long flags;
759 unsigned int scanlines = height * c->vc_font.height;
760 u8 scanlines_lo = 0, r7 = 0, vsync_end = 0, mode, max_scan;
761
762 raw_spin_lock_irqsave(&vga_lock, flags);
763
764 vgacon_xres = width * VGA_FONTWIDTH;
765 vgacon_yres = height * c->vc_font.height;
766 if (vga_video_type >= VIDEO_TYPE_VGAC) {
767 outb_p(VGA_CRTC_MAX_SCAN, vga_video_port_reg);
768 max_scan = inb_p(vga_video_port_val);
769
770 if (max_scan & 0x80)
771 scanlines <<= 1;
772
773 outb_p(VGA_CRTC_MODE, vga_video_port_reg);
774 mode = inb_p(vga_video_port_val);
775
776 if (mode & 0x04)
777 scanlines >>= 1;
778
779 scanlines -= 1;
780 scanlines_lo = scanlines & 0xff;
781
782 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg);
783 r7 = inb_p(vga_video_port_val) & ~0x42;
784
785 if (scanlines & 0x100)
786 r7 |= 0x02;
787 if (scanlines & 0x200)
788 r7 |= 0x40;
789
790 /* deprotect registers */
791 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
792 vsync_end = inb_p(vga_video_port_val);
793 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
794 outb_p(vsync_end & ~0x80, vga_video_port_val);
795 }
796
797 outb_p(VGA_CRTC_H_DISP, vga_video_port_reg);
798 outb_p(width - 1, vga_video_port_val);
799 outb_p(VGA_CRTC_OFFSET, vga_video_port_reg);
800 outb_p(width >> 1, vga_video_port_val);
801
802 if (vga_video_type >= VIDEO_TYPE_VGAC) {
803 outb_p(VGA_CRTC_V_DISP_END, vga_video_port_reg);
804 outb_p(scanlines_lo, vga_video_port_val);
805 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg);
806 outb_p(r7,vga_video_port_val);
807
808 /* reprotect registers */
809 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
810 outb_p(vsync_end, vga_video_port_val);
811 }
812
813 raw_spin_unlock_irqrestore(&vga_lock, flags);
814 return 0;
815 }
816
817 static int vgacon_switch(struct vc_data *c)
818 {
819 int x = c->vc_cols * VGA_FONTWIDTH;
820 int y = c->vc_rows * c->vc_font.height;
821 int rows = screen_info.orig_video_lines * vga_default_font_height/
822 c->vc_font.height;
823 /*
824 * We need to save screen size here as it's the only way
825 * we can spot the screen has been resized and we need to
826 * set size of freshly allocated screens ourselves.
827 */
828 vga_video_num_columns = c->vc_cols;
829 vga_video_num_lines = c->vc_rows;
830
831 /* We can only copy out the size of the video buffer here,
832 * otherwise we get into VGA BIOS */
833
834 if (!vga_is_gfx) {
835 scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,
836 c->vc_screenbuf_size > vga_vram_size ?
837 vga_vram_size : c->vc_screenbuf_size);
838
839 if ((vgacon_xres != x || vgacon_yres != y) &&
840 (!(vga_video_num_columns % 2) &&
841 vga_video_num_columns <= screen_info.orig_video_cols &&
842 vga_video_num_lines <= rows))
843 vgacon_doresize(c, c->vc_cols, c->vc_rows);
844 }
845
846 vgacon_scrollback_init(c->vc_size_row);
847 return 0; /* Redrawing not needed */
848 }
849
850 static void vga_set_palette(struct vc_data *vc, unsigned char *table)
851 {
852 int i, j;
853
854 vga_w(state.vgabase, VGA_PEL_MSK, 0xff);
855 for (i = j = 0; i < 16; i++) {
856 vga_w(state.vgabase, VGA_PEL_IW, table[i]);
857 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
858 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
859 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
860 }
861 }
862
863 static int vgacon_set_palette(struct vc_data *vc, unsigned char *table)
864 {
865 #ifdef CAN_LOAD_PALETTE
866 if (vga_video_type != VIDEO_TYPE_VGAC || vga_palette_blanked
867 || !CON_IS_VISIBLE(vc))
868 return -EINVAL;
869 vga_set_palette(vc, table);
870 return 0;
871 #else
872 return -EINVAL;
873 #endif
874 }
875
876 /* structure holding original VGA register settings */
877 static struct {
878 unsigned char SeqCtrlIndex; /* Sequencer Index reg. */
879 unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */
880 unsigned char CrtMiscIO; /* Miscellaneous register */
881 unsigned char HorizontalTotal; /* CRT-Controller:00h */
882 unsigned char HorizDisplayEnd; /* CRT-Controller:01h */
883 unsigned char StartHorizRetrace; /* CRT-Controller:04h */
884 unsigned char EndHorizRetrace; /* CRT-Controller:05h */
885 unsigned char Overflow; /* CRT-Controller:07h */
886 unsigned char StartVertRetrace; /* CRT-Controller:10h */
887 unsigned char EndVertRetrace; /* CRT-Controller:11h */
888 unsigned char ModeControl; /* CRT-Controller:17h */
889 unsigned char ClockingMode; /* Seq-Controller:01h */
890 } vga_state;
891
892 static void vga_vesa_blank(struct vgastate *state, int mode)
893 {
894 /* save original values of VGA controller registers */
895 if (!vga_vesa_blanked) {
896 raw_spin_lock_irq(&vga_lock);
897 vga_state.SeqCtrlIndex = vga_r(state->vgabase, VGA_SEQ_I);
898 vga_state.CrtCtrlIndex = inb_p(vga_video_port_reg);
899 vga_state.CrtMiscIO = vga_r(state->vgabase, VGA_MIS_R);
900 raw_spin_unlock_irq(&vga_lock);
901
902 outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */
903 vga_state.HorizontalTotal = inb_p(vga_video_port_val);
904 outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */
905 vga_state.HorizDisplayEnd = inb_p(vga_video_port_val);
906 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
907 vga_state.StartHorizRetrace = inb_p(vga_video_port_val);
908 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
909 vga_state.EndHorizRetrace = inb_p(vga_video_port_val);
910 outb_p(0x07, vga_video_port_reg); /* Overflow */
911 vga_state.Overflow = inb_p(vga_video_port_val);
912 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
913 vga_state.StartVertRetrace = inb_p(vga_video_port_val);
914 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
915 vga_state.EndVertRetrace = inb_p(vga_video_port_val);
916 outb_p(0x17, vga_video_port_reg); /* ModeControl */
917 vga_state.ModeControl = inb_p(vga_video_port_val);
918 vga_state.ClockingMode = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
919 }
920
921 /* assure that video is enabled */
922 /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
923 raw_spin_lock_irq(&vga_lock);
924 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode | 0x20);
925
926 /* test for vertical retrace in process.... */
927 if ((vga_state.CrtMiscIO & 0x80) == 0x80)
928 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO & 0xEF);
929
930 /*
931 * Set <End of vertical retrace> to minimum (0) and
932 * <Start of vertical Retrace> to maximum (incl. overflow)
933 * Result: turn off vertical sync (VSync) pulse.
934 */
935 if (mode & VESA_VSYNC_SUSPEND) {
936 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
937 outb_p(0xff, vga_video_port_val); /* maximum value */
938 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
939 outb_p(0x40, vga_video_port_val); /* minimum (bits 0..3) */
940 outb_p(0x07, vga_video_port_reg); /* Overflow */
941 outb_p(vga_state.Overflow | 0x84, vga_video_port_val); /* bits 9,10 of vert. retrace */
942 }
943
944 if (mode & VESA_HSYNC_SUSPEND) {
945 /*
946 * Set <End of horizontal retrace> to minimum (0) and
947 * <Start of horizontal Retrace> to maximum
948 * Result: turn off horizontal sync (HSync) pulse.
949 */
950 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
951 outb_p(0xff, vga_video_port_val); /* maximum */
952 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
953 outb_p(0x00, vga_video_port_val); /* minimum (0) */
954 }
955
956 /* restore both index registers */
957 vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);
958 outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg);
959 raw_spin_unlock_irq(&vga_lock);
960 }
961
962 static void vga_vesa_unblank(struct vgastate *state)
963 {
964 /* restore original values of VGA controller registers */
965 raw_spin_lock_irq(&vga_lock);
966 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO);
967
968 outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */
969 outb_p(vga_state.HorizontalTotal, vga_video_port_val);
970 outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */
971 outb_p(vga_state.HorizDisplayEnd, vga_video_port_val);
972 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
973 outb_p(vga_state.StartHorizRetrace, vga_video_port_val);
974 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
975 outb_p(vga_state.EndHorizRetrace, vga_video_port_val);
976 outb_p(0x07, vga_video_port_reg); /* Overflow */
977 outb_p(vga_state.Overflow, vga_video_port_val);
978 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
979 outb_p(vga_state.StartVertRetrace, vga_video_port_val);
980 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
981 outb_p(vga_state.EndVertRetrace, vga_video_port_val);
982 outb_p(0x17, vga_video_port_reg); /* ModeControl */
983 outb_p(vga_state.ModeControl, vga_video_port_val);
984 /* ClockingMode */
985 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode);
986
987 /* restore index/control registers */
988 vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);
989 outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg);
990 raw_spin_unlock_irq(&vga_lock);
991 }
992
993 static void vga_pal_blank(struct vgastate *state)
994 {
995 int i;
996
997 vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
998 for (i = 0; i < 16; i++) {
999 vga_w(state->vgabase, VGA_PEL_IW, i);
1000 vga_w(state->vgabase, VGA_PEL_D, 0);
1001 vga_w(state->vgabase, VGA_PEL_D, 0);
1002 vga_w(state->vgabase, VGA_PEL_D, 0);
1003 }
1004 }
1005
1006 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch)
1007 {
1008 switch (blank) {
1009 case 0: /* Unblank */
1010 if (vga_vesa_blanked) {
1011 vga_vesa_unblank(&state);
1012 vga_vesa_blanked = 0;
1013 }
1014 if (vga_palette_blanked) {
1015 vga_set_palette(c, color_table);
1016 vga_palette_blanked = 0;
1017 return 0;
1018 }
1019 vga_is_gfx = 0;
1020 /* Tell console.c that it has to restore the screen itself */
1021 return 1;
1022 case 1: /* Normal blanking */
1023 case -1: /* Obsolete */
1024 if (!mode_switch && vga_video_type == VIDEO_TYPE_VGAC) {
1025 vga_pal_blank(&state);
1026 vga_palette_blanked = 1;
1027 return 0;
1028 }
1029 vgacon_set_origin(c);
1030 scr_memsetw((void *) vga_vram_base, BLANK,
1031 c->vc_screenbuf_size);
1032 if (mode_switch)
1033 vga_is_gfx = 1;
1034 return 1;
1035 default: /* VESA blanking */
1036 if (vga_video_type == VIDEO_TYPE_VGAC) {
1037 vga_vesa_blank(&state, blank - 1);
1038 vga_vesa_blanked = blank;
1039 }
1040 return 0;
1041 }
1042 }
1043
1044 /*
1045 * PIO_FONT support.
1046 *
1047 * The font loading code goes back to the codepage package by
1048 * Joel Hoffman (joel@wam.umd.edu). (He reports that the original
1049 * reference is: "From: p. 307 of _Programmer's Guide to PC & PS/2
1050 * Video Systems_ by Richard Wilton. 1987. Microsoft Press".)
1051 *
1052 * Change for certain monochrome monitors by Yury Shevchuck
1053 * (sizif@botik.yaroslavl.su).
1054 */
1055
1056 #ifdef CAN_LOAD_EGA_FONTS
1057
1058 #define colourmap 0xa0000
1059 /* Pauline Middelink <middelin@polyware.iaf.nl> reports that we
1060 should use 0xA0000 for the bwmap as well.. */
1061 #define blackwmap 0xa0000
1062 #define cmapsz 8192
1063
1064 static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512)
1065 {
1066 unsigned short video_port_status = vga_video_port_reg + 6;
1067 int font_select = 0x00, beg, i;
1068 char *charmap;
1069 bool clear_attribs = false;
1070 if (vga_video_type != VIDEO_TYPE_EGAM) {
1071 charmap = (char *) VGA_MAP_MEM(colourmap, 0);
1072 beg = 0x0e;
1073 #ifdef VGA_CAN_DO_64KB
1074 if (vga_video_type == VIDEO_TYPE_VGAC)
1075 beg = 0x06;
1076 #endif
1077 } else {
1078 charmap = (char *) VGA_MAP_MEM(blackwmap, 0);
1079 beg = 0x0a;
1080 }
1081
1082 #ifdef BROKEN_GRAPHICS_PROGRAMS
1083 /*
1084 * All fonts are loaded in slot 0 (0:1 for 512 ch)
1085 */
1086
1087 if (!arg)
1088 return -EINVAL; /* Return to default font not supported */
1089
1090 vga_font_is_default = 0;
1091 font_select = ch512 ? 0x04 : 0x00;
1092 #else
1093 /*
1094 * The default font is kept in slot 0 and is never touched.
1095 * A custom font is loaded in slot 2 (256 ch) or 2:3 (512 ch)
1096 */
1097
1098 if (set) {
1099 vga_font_is_default = !arg;
1100 if (!arg)
1101 ch512 = 0; /* Default font is always 256 */
1102 font_select = arg ? (ch512 ? 0x0e : 0x0a) : 0x00;
1103 }
1104
1105 if (!vga_font_is_default)
1106 charmap += 4 * cmapsz;
1107 #endif
1108
1109 raw_spin_lock_irq(&vga_lock);
1110 /* First, the Sequencer */
1111 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
1112 /* CPU writes only to map 2 */
1113 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x04);
1114 /* Sequential addressing */
1115 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x07);
1116 /* Clear synchronous reset */
1117 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
1118
1119 /* Now, the graphics controller, select map 2 */
1120 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x02);
1121 /* disable odd-even addressing */
1122 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x00);
1123 /* map start at A000:0000 */
1124 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x00);
1125 raw_spin_unlock_irq(&vga_lock);
1126
1127 if (arg) {
1128 if (set)
1129 for (i = 0; i < cmapsz; i++) {
1130 vga_writeb(arg[i], charmap + i);
1131 cond_resched();
1132 }
1133 else
1134 for (i = 0; i < cmapsz; i++) {
1135 arg[i] = vga_readb(charmap + i);
1136 cond_resched();
1137 }
1138
1139 /*
1140 * In 512-character mode, the character map is not contiguous if
1141 * we want to remain EGA compatible -- which we do
1142 */
1143
1144 if (ch512) {
1145 charmap += 2 * cmapsz;
1146 arg += cmapsz;
1147 if (set)
1148 for (i = 0; i < cmapsz; i++) {
1149 vga_writeb(arg[i], charmap + i);
1150 cond_resched();
1151 }
1152 else
1153 for (i = 0; i < cmapsz; i++) {
1154 arg[i] = vga_readb(charmap + i);
1155 cond_resched();
1156 }
1157 }
1158 }
1159
1160 raw_spin_lock_irq(&vga_lock);
1161 /* First, the sequencer, Synchronous reset */
1162 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01);
1163 /* CPU writes to maps 0 and 1 */
1164 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x03);
1165 /* odd-even addressing */
1166 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x03);
1167 /* Character Map Select */
1168 if (set)
1169 vga_wseq(state->vgabase, VGA_SEQ_CHARACTER_MAP, font_select);
1170 /* clear synchronous reset */
1171 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
1172
1173 /* Now, the graphics controller, select map 0 for CPU */
1174 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x00);
1175 /* enable even-odd addressing */
1176 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x10);
1177 /* map starts at b800:0 or b000:0 */
1178 vga_wgfx(state->vgabase, VGA_GFX_MISC, beg);
1179
1180 /* if 512 char mode is already enabled don't re-enable it. */
1181 if ((set) && (ch512 != vga_512_chars)) {
1182 vga_512_chars = ch512;
1183 /* 256-char: enable intensity bit
1184 512-char: disable intensity bit */
1185 inb_p(video_port_status); /* clear address flip-flop */
1186 /* color plane enable register */
1187 vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f);
1188 /* Wilton (1987) mentions the following; I don't know what
1189 it means, but it works, and it appears necessary */
1190 inb_p(video_port_status);
1191 vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0);
1192 clear_attribs = true;
1193 }
1194 raw_spin_unlock_irq(&vga_lock);
1195
1196 if (clear_attribs) {
1197 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1198 struct vc_data *c = vc_cons[i].d;
1199 if (c && c->vc_sw == &vga_con) {
1200 /* force hi font mask to 0, so we always clear
1201 the bit on either transition */
1202 c->vc_hi_font_mask = 0x00;
1203 clear_buffer_attributes(c);
1204 c->vc_hi_font_mask = ch512 ? 0x0800 : 0;
1205 }
1206 }
1207 }
1208 return 0;
1209 }
1210
1211 /*
1212 * Adjust the screen to fit a font of a certain height
1213 */
1214 static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight)
1215 {
1216 unsigned char ovr, vde, fsr;
1217 int rows, maxscan, i;
1218
1219 rows = vc->vc_scan_lines / fontheight; /* Number of video rows we end up with */
1220 maxscan = rows * fontheight - 1; /* Scan lines to actually display-1 */
1221
1222 /* Reprogram the CRTC for the new font size
1223 Note: the attempt to read the overflow register will fail
1224 on an EGA, but using 0xff for the previous value appears to
1225 be OK for EGA text modes in the range 257-512 scan lines, so I
1226 guess we don't need to worry about it.
1227
1228 The same applies for the spill bits in the font size and cursor
1229 registers; they are write-only on EGA, but it appears that they
1230 are all don't care bits on EGA, so I guess it doesn't matter. */
1231
1232 raw_spin_lock_irq(&vga_lock);
1233 outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */
1234 ovr = inb_p(vga_video_port_val);
1235 outb_p(0x09, vga_video_port_reg); /* Font size register */
1236 fsr = inb_p(vga_video_port_val);
1237 raw_spin_unlock_irq(&vga_lock);
1238
1239 vde = maxscan & 0xff; /* Vertical display end reg */
1240 ovr = (ovr & 0xbd) + /* Overflow register */
1241 ((maxscan & 0x100) >> 7) + ((maxscan & 0x200) >> 3);
1242 fsr = (fsr & 0xe0) + (fontheight - 1); /* Font size register */
1243
1244 raw_spin_lock_irq(&vga_lock);
1245 outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */
1246 outb_p(ovr, vga_video_port_val);
1247 outb_p(0x09, vga_video_port_reg); /* Font size */
1248 outb_p(fsr, vga_video_port_val);
1249 outb_p(0x12, vga_video_port_reg); /* Vertical display limit */
1250 outb_p(vde, vga_video_port_val);
1251 raw_spin_unlock_irq(&vga_lock);
1252 vga_video_font_height = fontheight;
1253
1254 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1255 struct vc_data *c = vc_cons[i].d;
1256
1257 if (c && c->vc_sw == &vga_con) {
1258 if (CON_IS_VISIBLE(c)) {
1259 /* void size to cause regs to be rewritten */
1260 cursor_size_lastfrom = 0;
1261 cursor_size_lastto = 0;
1262 c->vc_sw->con_cursor(c, CM_DRAW);
1263 }
1264 c->vc_font.height = fontheight;
1265 vc_resize(c, 0, rows); /* Adjust console size */
1266 }
1267 }
1268 return 0;
1269 }
1270
1271 static int vgacon_font_set(struct vc_data *c, struct console_font *font, unsigned flags)
1272 {
1273 unsigned charcount = font->charcount;
1274 int rc;
1275
1276 if (vga_video_type < VIDEO_TYPE_EGAM)
1277 return -EINVAL;
1278
1279 if (font->width != VGA_FONTWIDTH ||
1280 (charcount != 256 && charcount != 512))
1281 return -EINVAL;
1282
1283 rc = vgacon_do_font_op(&state, font->data, 1, charcount == 512);
1284 if (rc)
1285 return rc;
1286
1287 if (!(flags & KD_FONT_FLAG_DONT_RECALC))
1288 rc = vgacon_adjust_height(c, font->height);
1289 return rc;
1290 }
1291
1292 static int vgacon_font_get(struct vc_data *c, struct console_font *font)
1293 {
1294 if (vga_video_type < VIDEO_TYPE_EGAM)
1295 return -EINVAL;
1296
1297 font->width = VGA_FONTWIDTH;
1298 font->height = c->vc_font.height;
1299 font->charcount = vga_512_chars ? 512 : 256;
1300 if (!font->data)
1301 return 0;
1302 return vgacon_do_font_op(&state, font->data, 0, vga_512_chars);
1303 }
1304
1305 #else
1306
1307 #define vgacon_font_set NULL
1308 #define vgacon_font_get NULL
1309
1310 #endif
1311
1312 static int vgacon_resize(struct vc_data *c, unsigned int width,
1313 unsigned int height, unsigned int user)
1314 {
1315 if (width % 2 || width > screen_info.orig_video_cols ||
1316 height > (screen_info.orig_video_lines * vga_default_font_height)/
1317 c->vc_font.height)
1318 /* let svgatextmode tinker with video timings and
1319 return success */
1320 return (user) ? 0 : -EINVAL;
1321
1322 if (CON_IS_VISIBLE(c) && !vga_is_gfx) /* who knows */
1323 vgacon_doresize(c, width, height);
1324 return 0;
1325 }
1326
1327 static int vgacon_set_origin(struct vc_data *c)
1328 {
1329 if (vga_is_gfx || /* We don't play origin tricks in graphic modes */
1330 (console_blanked && !vga_palette_blanked)) /* Nor we write to blanked screens */
1331 return 0;
1332 c->vc_origin = c->vc_visible_origin = vga_vram_base;
1333 vga_set_mem_top(c);
1334 vga_rolled_over = 0;
1335 return 1;
1336 }
1337
1338 static void vgacon_save_screen(struct vc_data *c)
1339 {
1340 static int vga_bootup_console = 0;
1341
1342 if (!vga_bootup_console) {
1343 /* This is a gross hack, but here is the only place we can
1344 * set bootup console parameters without messing up generic
1345 * console initialization routines.
1346 */
1347 vga_bootup_console = 1;
1348 c->vc_x = screen_info.orig_x;
1349 c->vc_y = screen_info.orig_y;
1350 }
1351
1352 /* We can't copy in more than the size of the video buffer,
1353 * or we'll be copying in VGA BIOS */
1354
1355 if (!vga_is_gfx)
1356 scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin,
1357 c->vc_screenbuf_size > vga_vram_size ? vga_vram_size : c->vc_screenbuf_size);
1358 }
1359
1360 static int vgacon_scroll(struct vc_data *c, int t, int b, int dir,
1361 int lines)
1362 {
1363 unsigned long oldo;
1364 unsigned int delta;
1365
1366 if (t || b != c->vc_rows || vga_is_gfx || c->vc_mode != KD_TEXT)
1367 return 0;
1368
1369 if (!vga_hardscroll_enabled || lines >= c->vc_rows / 2)
1370 return 0;
1371
1372 vgacon_restore_screen(c);
1373 oldo = c->vc_origin;
1374 delta = lines * c->vc_size_row;
1375 if (dir == SM_UP) {
1376 vgacon_scrollback_update(c, t, lines);
1377 if (c->vc_scr_end + delta >= vga_vram_end) {
1378 scr_memcpyw((u16 *) vga_vram_base,
1379 (u16 *) (oldo + delta),
1380 c->vc_screenbuf_size - delta);
1381 c->vc_origin = vga_vram_base;
1382 vga_rolled_over = oldo - vga_vram_base;
1383 } else
1384 c->vc_origin += delta;
1385 scr_memsetw((u16 *) (c->vc_origin + c->vc_screenbuf_size -
1386 delta), c->vc_video_erase_char,
1387 delta);
1388 } else {
1389 if (oldo - delta < vga_vram_base) {
1390 scr_memmovew((u16 *) (vga_vram_end -
1391 c->vc_screenbuf_size +
1392 delta), (u16 *) oldo,
1393 c->vc_screenbuf_size - delta);
1394 c->vc_origin = vga_vram_end - c->vc_screenbuf_size;
1395 vga_rolled_over = 0;
1396 } else
1397 c->vc_origin -= delta;
1398 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1399 scr_memsetw((u16 *) (c->vc_origin), c->vc_video_erase_char,
1400 delta);
1401 }
1402 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1403 c->vc_visible_origin = c->vc_origin;
1404 vga_set_mem_top(c);
1405 c->vc_pos = (c->vc_pos - oldo) + c->vc_origin;
1406 return 1;
1407 }
1408
1409
1410 /*
1411 * The console `switch' structure for the VGA based console
1412 */
1413
1414 static int vgacon_dummy(struct vc_data *c)
1415 {
1416 return 0;
1417 }
1418
1419 #define DUMMY (void *) vgacon_dummy
1420
1421 const struct consw vga_con = {
1422 .owner = THIS_MODULE,
1423 .con_startup = vgacon_startup,
1424 .con_init = vgacon_init,
1425 .con_deinit = vgacon_deinit,
1426 .con_clear = DUMMY,
1427 .con_putc = DUMMY,
1428 .con_putcs = DUMMY,
1429 .con_cursor = vgacon_cursor,
1430 .con_scroll = vgacon_scroll,
1431 .con_bmove = DUMMY,
1432 .con_switch = vgacon_switch,
1433 .con_blank = vgacon_blank,
1434 .con_font_set = vgacon_font_set,
1435 .con_font_get = vgacon_font_get,
1436 .con_resize = vgacon_resize,
1437 .con_set_palette = vgacon_set_palette,
1438 .con_scrolldelta = vgacon_scrolldelta,
1439 .con_set_origin = vgacon_set_origin,
1440 .con_save_screen = vgacon_save_screen,
1441 .con_build_attr = vgacon_build_attr,
1442 .con_invert_region = vgacon_invert_region,
1443 };
1444 EXPORT_SYMBOL(vga_con);
1445
1446 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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