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