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