xref: /freebsd/sys/dev/fb/vesa.c (revision 9124ddeb4a551977cf6b2218291e7c666ce25f47)
1 /*-
2  * Copyright (c) 1998 Kazutaka YOKOTA and Michael Smith
3  * Copyright (c) 2009-2012 Jung-uk Kim <jkim@FreeBSD.org>
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer as
11  *    the first lines of this file unmodified.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30 
31 #include "opt_vga.h"
32 #include "opt_vesa.h"
33 
34 #ifndef VGA_NO_MODE_CHANGE
35 
36 #include <sys/param.h>
37 #include <sys/bus.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/lock.h>
41 #include <sys/module.h>
42 #include <sys/malloc.h>
43 #include <sys/mutex.h>
44 #include <sys/fbio.h>
45 #include <sys/sysctl.h>
46 
47 #include <vm/vm.h>
48 #include <vm/vm_extern.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_param.h>
51 #include <vm/pmap.h>
52 
53 #include <machine/pc/bios.h>
54 #include <dev/fb/vesa.h>
55 
56 #include <dev/fb/fbreg.h>
57 #include <dev/fb/vgareg.h>
58 
59 #include <dev/pci/pcivar.h>
60 
61 #include <isa/isareg.h>
62 
63 #include <compat/x86bios/x86bios.h>
64 
65 #define	VESA_BIOS_OFFSET	0xc0000
66 #define	VESA_PALETTE_SIZE	(256 * 4)
67 #define	VESA_VIA_CLE266		"VIA CLE266\r\n"
68 
69 #ifndef VESA_DEBUG
70 #define VESA_DEBUG	0
71 #endif
72 
73 /* VESA video adapter state buffer stub */
74 struct adp_state {
75 	int		sig;
76 #define V_STATE_SIG	0x61736576
77 	u_char		regs[1];
78 };
79 typedef struct adp_state adp_state_t;
80 
81 static struct mtx vesa_lock;
82 
83 static int vesa_state;
84 static void *vesa_state_buf = NULL;
85 static uint32_t vesa_state_buf_offs = 0;
86 static ssize_t vesa_state_buf_size = 0;
87 
88 static u_char *vesa_palette = NULL;
89 static uint32_t vesa_palette_offs = 0;
90 
91 static void *vesa_bios = NULL;
92 static uint32_t vesa_bios_offs = VESA_BIOS_OFFSET;
93 static uint32_t vesa_bios_int10 = 0;
94 static size_t vesa_bios_size = 0;
95 
96 /* VESA video adapter */
97 static video_adapter_t *vesa_adp = NULL;
98 
99 static SYSCTL_NODE(_debug, OID_AUTO, vesa, CTLFLAG_RD, NULL, "VESA debugging");
100 static int vesa_shadow_rom = 0;
101 TUNABLE_INT("debug.vesa.shadow_rom", &vesa_shadow_rom);
102 SYSCTL_INT(_debug_vesa, OID_AUTO, shadow_rom, CTLFLAG_RDTUN, &vesa_shadow_rom,
103     0, "Enable video BIOS shadow");
104 
105 /* VESA functions */
106 #if 0
107 static int			vesa_nop(void);
108 #endif
109 static int			vesa_error(void);
110 static vi_probe_t		vesa_probe;
111 static vi_init_t		vesa_init;
112 static vi_get_info_t		vesa_get_info;
113 static vi_query_mode_t		vesa_query_mode;
114 static vi_set_mode_t		vesa_set_mode;
115 static vi_save_font_t		vesa_save_font;
116 static vi_load_font_t		vesa_load_font;
117 static vi_show_font_t		vesa_show_font;
118 static vi_save_palette_t	vesa_save_palette;
119 static vi_load_palette_t	vesa_load_palette;
120 static vi_set_border_t		vesa_set_border;
121 static vi_save_state_t		vesa_save_state;
122 static vi_load_state_t		vesa_load_state;
123 static vi_set_win_org_t		vesa_set_origin;
124 static vi_read_hw_cursor_t	vesa_read_hw_cursor;
125 static vi_set_hw_cursor_t	vesa_set_hw_cursor;
126 static vi_set_hw_cursor_shape_t	vesa_set_hw_cursor_shape;
127 static vi_blank_display_t	vesa_blank_display;
128 static vi_mmap_t		vesa_mmap;
129 static vi_ioctl_t		vesa_ioctl;
130 static vi_clear_t		vesa_clear;
131 static vi_fill_rect_t		vesa_fill_rect;
132 static vi_bitblt_t		vesa_bitblt;
133 static vi_diag_t		vesa_diag;
134 static int			vesa_bios_info(int level);
135 
136 static video_switch_t vesavidsw = {
137 	vesa_probe,
138 	vesa_init,
139 	vesa_get_info,
140 	vesa_query_mode,
141 	vesa_set_mode,
142 	vesa_save_font,
143 	vesa_load_font,
144 	vesa_show_font,
145 	vesa_save_palette,
146 	vesa_load_palette,
147 	vesa_set_border,
148 	vesa_save_state,
149 	vesa_load_state,
150 	vesa_set_origin,
151 	vesa_read_hw_cursor,
152 	vesa_set_hw_cursor,
153 	vesa_set_hw_cursor_shape,
154 	vesa_blank_display,
155 	vesa_mmap,
156 	vesa_ioctl,
157 	vesa_clear,
158 	vesa_fill_rect,
159 	vesa_bitblt,
160 	vesa_error,
161 	vesa_error,
162 	vesa_diag,
163 };
164 
165 static video_switch_t *prevvidsw;
166 
167 /* VESA BIOS video modes */
168 #define VESA_MAXMODES	64
169 #define EOT		(-1)
170 #define NA		(-2)
171 
172 #define MODE_TABLE_DELTA 8
173 
174 static int vesa_vmode_max = 0;
175 static video_info_t vesa_vmode_empty = { EOT };
176 static video_info_t *vesa_vmode = &vesa_vmode_empty;
177 
178 static int vesa_init_done = FALSE;
179 static int has_vesa_bios = FALSE;
180 static struct vesa_info *vesa_adp_info = NULL;
181 static u_int16_t *vesa_vmodetab = NULL;
182 static char *vesa_oemstr = NULL;
183 static char *vesa_venderstr = NULL;
184 static char *vesa_prodstr = NULL;
185 static char *vesa_revstr = NULL;
186 
187 /* local macros and functions */
188 #define BIOS_SADDRTOLADDR(p) ((((p) & 0xffff0000) >> 12) + ((p) & 0x0000ffff))
189 
190 static int int10_set_mode(int mode);
191 static int vesa_bios_post(void);
192 static int vesa_bios_get_mode(int mode, struct vesa_mode *vmode, int flags);
193 static int vesa_bios_set_mode(int mode);
194 #if 0
195 static int vesa_bios_get_dac(void);
196 #endif
197 static int vesa_bios_set_dac(int bits);
198 static int vesa_bios_save_palette(int start, int colors, u_char *palette,
199 				  int bits);
200 static int vesa_bios_save_palette2(int start, int colors, u_char *r, u_char *g,
201 				   u_char *b, int bits);
202 static int vesa_bios_load_palette(int start, int colors, u_char *palette,
203 				  int bits);
204 static int vesa_bios_load_palette2(int start, int colors, u_char *r, u_char *g,
205 				   u_char *b, int bits);
206 #define STATE_SIZE	0
207 #define STATE_SAVE	1
208 #define STATE_LOAD	2
209 static ssize_t vesa_bios_state_buf_size(int);
210 static int vesa_bios_save_restore(int code, void *p);
211 #ifdef MODE_TABLE_BROKEN
212 static int vesa_bios_get_line_length(void);
213 #endif
214 static int vesa_bios_set_line_length(int pixel, int *bytes, int *lines);
215 #if 0
216 static int vesa_bios_get_start(int *x, int *y);
217 #endif
218 static int vesa_bios_set_start(int x, int y);
219 static int vesa_map_gen_mode_num(int type, int color, int mode);
220 static int vesa_translate_flags(u_int16_t vflags);
221 static int vesa_translate_mmodel(u_int8_t vmodel);
222 static int vesa_get_bpscanline(struct vesa_mode *vmode);
223 static int vesa_bios_init(void);
224 static void vesa_clear_modes(video_info_t *info, int color);
225 
226 #if 0
227 static int vesa_get_origin(video_adapter_t *adp, off_t *offset);
228 #endif
229 
230 /* INT 10 BIOS calls */
231 static int
232 int10_set_mode(int mode)
233 {
234 	x86regs_t regs;
235 
236 	x86bios_init_regs(&regs);
237 	regs.R_AL = mode;
238 
239 	x86bios_intr(&regs, 0x10);
240 
241 	return (0);
242 }
243 
244 static int
245 vesa_bios_post(void)
246 {
247 	x86regs_t regs;
248 	devclass_t dc;
249 	device_t *devs;
250 	device_t dev;
251 	int count, i, is_pci;
252 
253 	if (x86bios_get_orm(vesa_bios_offs) == NULL)
254 		return (1);
255 
256 	dev = NULL;
257 	is_pci = 0;
258 
259 	/* Find the matching PCI video controller. */
260 	dc = devclass_find("vgapci");
261 	if (dc != NULL && devclass_get_devices(dc, &devs, &count) == 0) {
262 		for (i = 0; i < count; i++)
263 			if (device_get_flags(devs[i]) != 0 &&
264 			    x86bios_match_device(vesa_bios_offs, devs[i])) {
265 				dev = devs[i];
266 				is_pci = 1;
267 				break;
268 			}
269 		free(devs, M_TEMP);
270 	}
271 
272 	/* Try VGA if a PCI device is not found. */
273 	if (dev == NULL) {
274 		dc = devclass_find(VGA_DRIVER_NAME);
275 		if (dc != NULL)
276 			dev = devclass_get_device(dc, 0);
277 	}
278 
279 	if (bootverbose)
280 		printf("%s: calling BIOS POST\n",
281 		    dev == NULL ? "VESA" : device_get_nameunit(dev));
282 
283 	x86bios_init_regs(&regs);
284 	if (is_pci) {
285 		regs.R_AH = pci_get_bus(dev);
286 		regs.R_AL = (pci_get_slot(dev) << 3) |
287 		    (pci_get_function(dev) & 0x07);
288 	}
289 	regs.R_DL = 0x80;
290 	x86bios_call(&regs, X86BIOS_PHYSTOSEG(vesa_bios_offs + 3),
291 	    X86BIOS_PHYSTOOFF(vesa_bios_offs + 3));
292 
293 	if (x86bios_get_intr(0x10) == 0)
294 		return (1);
295 
296 	return (0);
297 }
298 
299 /* VESA BIOS calls */
300 static int
301 vesa_bios_get_mode(int mode, struct vesa_mode *vmode, int flags)
302 {
303 	x86regs_t regs;
304 	uint32_t offs;
305 	void *buf;
306 
307 	buf = x86bios_alloc(&offs, sizeof(*vmode), flags);
308 	if (buf == NULL)
309 		return (1);
310 
311 	x86bios_init_regs(&regs);
312 	regs.R_AX = 0x4f01;
313 	regs.R_CX = mode;
314 
315 	regs.R_ES = X86BIOS_PHYSTOSEG(offs);
316 	regs.R_DI = X86BIOS_PHYSTOOFF(offs);
317 
318 	x86bios_intr(&regs, 0x10);
319 
320 	if (regs.R_AX != 0x004f) {
321 		x86bios_free(buf, sizeof(*vmode));
322 		return (1);
323 	}
324 
325 	bcopy(buf, vmode, sizeof(*vmode));
326 	x86bios_free(buf, sizeof(*vmode));
327 
328 	return (0);
329 }
330 
331 static int
332 vesa_bios_set_mode(int mode)
333 {
334 	x86regs_t regs;
335 
336 	x86bios_init_regs(&regs);
337 	regs.R_AX = 0x4f02;
338 	regs.R_BX = mode;
339 
340 	x86bios_intr(&regs, 0x10);
341 
342 	return (regs.R_AX != 0x004f);
343 }
344 
345 #if 0
346 static int
347 vesa_bios_get_dac(void)
348 {
349 	x86regs_t regs;
350 
351 	x86bios_init_regs(&regs);
352 	regs.R_AX = 0x4f08;
353 	regs.R_BL = 1;
354 
355 	x86bios_intr(&regs, 0x10);
356 
357 	if (regs.R_AX != 0x004f)
358 		return (6);
359 
360 	return (regs.R_BH);
361 }
362 #endif
363 
364 static int
365 vesa_bios_set_dac(int bits)
366 {
367 	x86regs_t regs;
368 
369 	x86bios_init_regs(&regs);
370 	regs.R_AX = 0x4f08;
371 	/* regs.R_BL = 0; */
372 	regs.R_BH = bits;
373 
374 	x86bios_intr(&regs, 0x10);
375 
376 	if (regs.R_AX != 0x004f)
377 		return (6);
378 
379 	return (regs.R_BH);
380 }
381 
382 static int
383 vesa_bios_save_palette(int start, int colors, u_char *palette, int bits)
384 {
385 	x86regs_t regs;
386 	int i;
387 
388 	x86bios_init_regs(&regs);
389 	regs.R_AX = 0x4f09;
390 	regs.R_BL = 1;
391 	regs.R_CX = colors;
392 	regs.R_DX = start;
393 
394 	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_palette_offs);
395 	regs.R_DI = X86BIOS_PHYSTOOFF(vesa_palette_offs);
396 
397 	bits = 8 - bits;
398 	mtx_lock(&vesa_lock);
399 	x86bios_intr(&regs, 0x10);
400 	if (regs.R_AX != 0x004f) {
401 		mtx_unlock(&vesa_lock);
402 		return (1);
403 	}
404 	for (i = 0; i < colors; ++i) {
405 		palette[i * 3] = vesa_palette[i * 4 + 2] << bits;
406 		palette[i * 3 + 1] = vesa_palette[i * 4 + 1] << bits;
407 		palette[i * 3 + 2] = vesa_palette[i * 4] << bits;
408 	}
409 	mtx_unlock(&vesa_lock);
410 
411 	return (0);
412 }
413 
414 static int
415 vesa_bios_save_palette2(int start, int colors, u_char *r, u_char *g, u_char *b,
416 			int bits)
417 {
418 	x86regs_t regs;
419 	int i;
420 
421 	x86bios_init_regs(&regs);
422 	regs.R_AX = 0x4f09;
423 	regs.R_BL = 1;
424 	regs.R_CX = colors;
425 	regs.R_DX = start;
426 
427 	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_palette_offs);
428 	regs.R_DI = X86BIOS_PHYSTOOFF(vesa_palette_offs);
429 
430 	bits = 8 - bits;
431 	mtx_lock(&vesa_lock);
432 	x86bios_intr(&regs, 0x10);
433 	if (regs.R_AX != 0x004f) {
434 		mtx_unlock(&vesa_lock);
435 		return (1);
436 	}
437 	for (i = 0; i < colors; ++i) {
438 		r[i] = vesa_palette[i * 4 + 2] << bits;
439 		g[i] = vesa_palette[i * 4 + 1] << bits;
440 		b[i] = vesa_palette[i * 4] << bits;
441 	}
442 	mtx_unlock(&vesa_lock);
443 
444 	return (0);
445 }
446 
447 static int
448 vesa_bios_load_palette(int start, int colors, u_char *palette, int bits)
449 {
450 	x86regs_t regs;
451 	int i;
452 
453 	x86bios_init_regs(&regs);
454 	regs.R_AX = 0x4f09;
455 	/* regs.R_BL = 0; */
456 	regs.R_CX = colors;
457 	regs.R_DX = start;
458 
459 	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_palette_offs);
460 	regs.R_DI = X86BIOS_PHYSTOOFF(vesa_palette_offs);
461 
462 	bits = 8 - bits;
463 	mtx_lock(&vesa_lock);
464 	for (i = 0; i < colors; ++i) {
465 		vesa_palette[i * 4] = palette[i * 3 + 2] >> bits;
466 		vesa_palette[i * 4 + 1] = palette[i * 3 + 1] >> bits;
467 		vesa_palette[i * 4 + 2] = palette[i * 3] >> bits;
468 		vesa_palette[i * 4 + 3] = 0;
469 	}
470 	x86bios_intr(&regs, 0x10);
471 	mtx_unlock(&vesa_lock);
472 
473 	return (regs.R_AX != 0x004f);
474 }
475 
476 static int
477 vesa_bios_load_palette2(int start, int colors, u_char *r, u_char *g, u_char *b,
478 			int bits)
479 {
480 	x86regs_t regs;
481 	int i;
482 
483 	x86bios_init_regs(&regs);
484 	regs.R_AX = 0x4f09;
485 	/* regs.R_BL = 0; */
486 	regs.R_CX = colors;
487 	regs.R_DX = start;
488 
489 	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_palette_offs);
490 	regs.R_DI = X86BIOS_PHYSTOOFF(vesa_palette_offs);
491 
492 	bits = 8 - bits;
493 	mtx_lock(&vesa_lock);
494 	for (i = 0; i < colors; ++i) {
495 		vesa_palette[i * 4] = b[i] >> bits;
496 		vesa_palette[i * 4 + 1] = g[i] >> bits;
497 		vesa_palette[i * 4 + 2] = r[i] >> bits;
498 		vesa_palette[i * 4 + 3] = 0;
499 	}
500 	x86bios_intr(&regs, 0x10);
501 	mtx_unlock(&vesa_lock);
502 
503 	return (regs.R_AX != 0x004f);
504 }
505 
506 static ssize_t
507 vesa_bios_state_buf_size(int state)
508 {
509 	x86regs_t regs;
510 
511 	x86bios_init_regs(&regs);
512 	regs.R_AX = 0x4f04;
513 	/* regs.R_DL = STATE_SIZE; */
514 	regs.R_CX = state;
515 
516 	x86bios_intr(&regs, 0x10);
517 
518 	if (regs.R_AX != 0x004f)
519 		return (0);
520 
521 	return (regs.R_BX * 64);
522 }
523 
524 static int
525 vesa_bios_save_restore(int code, void *p)
526 {
527 	x86regs_t regs;
528 
529 	if (code != STATE_SAVE && code != STATE_LOAD)
530 		return (1);
531 
532 	x86bios_init_regs(&regs);
533 	regs.R_AX = 0x4f04;
534 	regs.R_DL = code;
535 	regs.R_CX = vesa_state;
536 
537 	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_state_buf_offs);
538 	regs.R_BX = X86BIOS_PHYSTOOFF(vesa_state_buf_offs);
539 
540 	mtx_lock(&vesa_lock);
541 	switch (code) {
542 	case STATE_SAVE:
543 		x86bios_intr(&regs, 0x10);
544 		bcopy(vesa_state_buf, p, vesa_state_buf_size);
545 		break;
546 	case STATE_LOAD:
547 		bcopy(p, vesa_state_buf, vesa_state_buf_size);
548 		x86bios_intr(&regs, 0x10);
549 		break;
550 	}
551 	mtx_unlock(&vesa_lock);
552 
553 	return (regs.R_AX != 0x004f);
554 }
555 
556 #ifdef MODE_TABLE_BROKEN
557 static int
558 vesa_bios_get_line_length(void)
559 {
560 	x86regs_t regs;
561 
562 	x86bios_init_regs(&regs);
563 	regs.R_AX = 0x4f06;
564 	regs.R_BL = 1;
565 
566 	x86bios_intr(&regs, 0x10);
567 
568 	if (regs.R_AX != 0x004f)
569 		return (-1);
570 
571 	return (regs.R_BX);
572 }
573 #endif
574 
575 static int
576 vesa_bios_set_line_length(int pixel, int *bytes, int *lines)
577 {
578 	x86regs_t regs;
579 
580 	x86bios_init_regs(&regs);
581 	regs.R_AX = 0x4f06;
582 	/* regs.R_BL = 0; */
583 	regs.R_CX = pixel;
584 
585 	x86bios_intr(&regs, 0x10);
586 
587 #if VESA_DEBUG > 1
588 	printf("bx:%d, cx:%d, dx:%d\n", regs.R_BX, regs.R_CX, regs.R_DX);
589 #endif
590 	if (regs.R_AX != 0x004f)
591 		return (-1);
592 
593 	if (bytes != NULL)
594 		*bytes = regs.R_BX;
595 	if (lines != NULL)
596 		*lines = regs.R_DX;
597 
598 	return (0);
599 }
600 
601 #if 0
602 static int
603 vesa_bios_get_start(int *x, int *y)
604 {
605 	x86regs_t regs;
606 
607 	x86bios_init_regs(&regs);
608 	regs.R_AX = 0x4f07;
609 	regs.R_BL = 1;
610 
611 	x86bios_intr(&regs, 0x10);
612 
613 	if (regs.R_AX != 0x004f)
614 		return (-1);
615 
616 	*x = regs.R_CX;
617 	*y = regs.R_DX;
618 
619 	return (0);
620 }
621 #endif
622 
623 static int
624 vesa_bios_set_start(int x, int y)
625 {
626 	x86regs_t regs;
627 
628 	x86bios_init_regs(&regs);
629 	regs.R_AX = 0x4f07;
630 	regs.R_BL = 0x80;
631 	regs.R_CX = x;
632 	regs.R_DX = y;
633 
634 	x86bios_intr(&regs, 0x10);
635 
636 	return (regs.R_AX != 0x004f);
637 }
638 
639 /* map a generic video mode to a known mode */
640 static int
641 vesa_map_gen_mode_num(int type, int color, int mode)
642 {
643     static struct {
644 	int from;
645 	int to;
646     } mode_map[] = {
647 	{ M_TEXT_132x25, M_VESA_C132x25 },
648 	{ M_TEXT_132x43, M_VESA_C132x43 },
649 	{ M_TEXT_132x50, M_VESA_C132x50 },
650 	{ M_TEXT_132x60, M_VESA_C132x60 },
651     };
652     int i;
653 
654     for (i = 0; i < sizeof(mode_map)/sizeof(mode_map[0]); ++i) {
655         if (mode_map[i].from == mode)
656             return (mode_map[i].to);
657     }
658     return (mode);
659 }
660 
661 static int
662 vesa_translate_flags(u_int16_t vflags)
663 {
664 	static struct {
665 		u_int16_t mask;
666 		int set;
667 		int reset;
668 	} ftable[] = {
669 		{ V_MODECOLOR, V_INFO_COLOR, 0 },
670 		{ V_MODEGRAPHICS, V_INFO_GRAPHICS, 0 },
671 		{ V_MODELFB, V_INFO_LINEAR, 0 },
672 		{ V_MODENONVGA, V_INFO_NONVGA, 0 },
673 	};
674 	int flags;
675 	int i;
676 
677 	for (flags = 0, i = 0; i < sizeof(ftable)/sizeof(ftable[0]); ++i) {
678 		flags |= (vflags & ftable[i].mask) ?
679 			 ftable[i].set : ftable[i].reset;
680 	}
681 	return (flags);
682 }
683 
684 static int
685 vesa_translate_mmodel(u_int8_t vmodel)
686 {
687 	static struct {
688 		u_int8_t vmodel;
689 		int mmodel;
690 	} mtable[] = {
691 		{ V_MMTEXT,	V_INFO_MM_TEXT },
692 		{ V_MMCGA,	V_INFO_MM_CGA },
693 		{ V_MMHGC,	V_INFO_MM_HGC },
694 		{ V_MMEGA,	V_INFO_MM_PLANAR },
695 		{ V_MMPACKED,	V_INFO_MM_PACKED },
696 		{ V_MMDIRCOLOR,	V_INFO_MM_DIRECT },
697 	};
698 	int i;
699 
700 	for (i = 0; mtable[i].mmodel >= 0; ++i) {
701 		if (mtable[i].vmodel == vmodel)
702 			return (mtable[i].mmodel);
703 	}
704 	return (V_INFO_MM_OTHER);
705 }
706 
707 static int
708 vesa_get_bpscanline(struct vesa_mode *vmode)
709 {
710 	int bpsl;
711 
712 	if ((vmode->v_modeattr & V_MODEGRAPHICS) != 0) {
713 		/* Find the minimum length. */
714 		switch (vmode->v_bpp / vmode->v_planes) {
715 		case 1:
716 			bpsl = vmode->v_width / 8;
717 			break;
718 		case 2:
719 			bpsl = vmode->v_width / 4;
720 			break;
721 		case 4:
722 			bpsl = vmode->v_width / 2;
723 			break;
724 		default:
725 			bpsl = vmode->v_width * ((vmode->v_bpp + 7) / 8);
726 			bpsl /= vmode->v_planes;
727 			break;
728 		}
729 
730 		/* Use VBE 3.0 information if it looks sane. */
731 		if ((vmode->v_modeattr & V_MODELFB) != 0 &&
732 		    vesa_adp_info->v_version >= 0x0300 &&
733 		    vmode->v_linbpscanline > bpsl)
734 			return (vmode->v_linbpscanline);
735 
736 		/* Return the minimum if the mode table looks absurd. */
737 		if (vmode->v_bpscanline < bpsl)
738 			return (bpsl);
739 	}
740 
741 	return (vmode->v_bpscanline);
742 }
743 
744 #define	VESA_MAXSTR		256
745 
746 #define	VESA_STRCPY(dst, src)	do {				\
747 	char *str;						\
748 	int i;							\
749 	dst = malloc(VESA_MAXSTR, M_DEVBUF, M_WAITOK);		\
750 	str = x86bios_offset(BIOS_SADDRTOLADDR(src));		\
751 	for (i = 0; i < VESA_MAXSTR - 1 && str[i] != '\0'; i++)	\
752 		dst[i] = str[i];				\
753 	dst[i] = '\0';						\
754 } while (0)
755 
756 static int
757 vesa_bios_init(void)
758 {
759 	struct vesa_mode vmode;
760 	struct vesa_info *buf;
761 	video_info_t *p;
762 	x86regs_t regs;
763 	size_t bsize;
764 	size_t msize;
765 	void *vmbuf;
766 	uint8_t *vbios;
767 	uint32_t offs;
768 	uint16_t vers;
769 	int is_via_cle266;
770 	int modes;
771 	int i;
772 
773 	if (vesa_init_done)
774 		return (0);
775 
776 	has_vesa_bios = FALSE;
777 	vesa_adp_info = NULL;
778 	vesa_bios_offs = VESA_BIOS_OFFSET;
779 	vesa_vmode_max = 0;
780 	vesa_vmode[0].vi_mode = EOT;
781 
782 	/*
783 	 * If the VBE real mode interrupt vector is not found, try BIOS POST.
784 	 */
785 	vesa_bios_int10 = x86bios_get_intr(0x10);
786 	if (vesa_bios_int10 == 0) {
787 		if (vesa_bios_post() != 0)
788 			return (1);
789 		vesa_bios_int10 = x86bios_get_intr(0x10);
790 		if (vesa_bios_int10 == 0)
791 			return (1);
792 	}
793 
794 	/*
795 	 * Shadow video ROM.
796 	 */
797 	offs = vesa_bios_int10;
798 	if (vesa_shadow_rom) {
799 		vbios = x86bios_get_orm(vesa_bios_offs);
800 		if (vbios != NULL) {
801 			vesa_bios_size = vbios[2] * 512;
802 			if (((VESA_BIOS_OFFSET << 12) & 0xffff0000) ==
803 			    (vesa_bios_int10 & 0xffff0000) &&
804 			    vesa_bios_size > (vesa_bios_int10 & 0xffff)) {
805 				vesa_bios = x86bios_alloc(&vesa_bios_offs,
806 				    vesa_bios_size, M_WAITOK);
807 				memcpy(vesa_bios, vbios, vesa_bios_size);
808 				offs = ((vesa_bios_offs << 12) & 0xffff0000) +
809 				    (vesa_bios_int10 & 0xffff);
810 				x86bios_set_intr(0x10, offs);
811 			}
812 		}
813 		if (vesa_bios == NULL)
814 			printf("VESA: failed to shadow video ROM\n");
815 	}
816 	if (bootverbose)
817 		printf("VESA: INT 0x10 vector 0x%04x:0x%04x\n",
818 		    (offs >> 16) & 0xffff, offs & 0xffff);
819 
820 	x86bios_init_regs(&regs);
821 	regs.R_AX = 0x4f00;
822 
823 	vmbuf = x86bios_alloc(&offs, sizeof(*buf), M_WAITOK);
824 
825 	regs.R_ES = X86BIOS_PHYSTOSEG(offs);
826 	regs.R_DI = X86BIOS_PHYSTOOFF(offs);
827 
828 	bcopy("VBE2", vmbuf, 4);	/* try for VBE2 data */
829 	x86bios_intr(&regs, 0x10);
830 
831 	if (regs.R_AX != 0x004f || bcmp("VESA", vmbuf, 4) != 0)
832 		goto fail;
833 
834 	vesa_adp_info = buf = malloc(sizeof(*buf), M_DEVBUF, M_WAITOK);
835 	bcopy(vmbuf, buf, sizeof(*buf));
836 
837 	if (bootverbose) {
838 		printf("VESA: information block\n");
839 		hexdump(buf, sizeof(*buf), NULL, HD_OMIT_CHARS);
840 	}
841 
842 	vers = buf->v_version = le16toh(buf->v_version);
843 	buf->v_oemstr = le32toh(buf->v_oemstr);
844 	buf->v_flags = le32toh(buf->v_flags);
845 	buf->v_modetable = le32toh(buf->v_modetable);
846 	buf->v_memsize = le16toh(buf->v_memsize);
847 	buf->v_revision = le16toh(buf->v_revision);
848 	buf->v_venderstr = le32toh(buf->v_venderstr);
849 	buf->v_prodstr = le32toh(buf->v_prodstr);
850 	buf->v_revstr = le32toh(buf->v_revstr);
851 
852 	if (vers < 0x0102) {
853 		printf("VESA: VBE version %d.%d is not supported; "
854 		    "version 1.2 or later is required.\n",
855 		    ((vers & 0xf000) >> 12) * 10 + ((vers & 0x0f00) >> 8),
856 		    ((vers & 0x00f0) >> 4) * 10 + (vers & 0x000f));
857 		goto fail;
858 	}
859 
860 	VESA_STRCPY(vesa_oemstr, buf->v_oemstr);
861 	if (vers >= 0x0200) {
862 		VESA_STRCPY(vesa_venderstr, buf->v_venderstr);
863 		VESA_STRCPY(vesa_prodstr, buf->v_prodstr);
864 		VESA_STRCPY(vesa_revstr, buf->v_revstr);
865 	}
866 	is_via_cle266 = strncmp(vesa_oemstr, VESA_VIA_CLE266,
867 	    sizeof(VESA_VIA_CLE266)) == 0;
868 
869 	if (buf->v_modetable == 0)
870 		goto fail;
871 
872 	msize = (size_t)buf->v_memsize * 64 * 1024;
873 
874 	vesa_vmodetab = x86bios_offset(BIOS_SADDRTOLADDR(buf->v_modetable));
875 
876 	for (i = 0, modes = 0; (i < (M_VESA_MODE_MAX - M_VESA_BASE + 1)) &&
877 	    (vesa_vmodetab[i] != 0xffff); ++i) {
878 		vesa_vmodetab[i] = le16toh(vesa_vmodetab[i]);
879 		if (vesa_bios_get_mode(vesa_vmodetab[i], &vmode, M_WAITOK))
880 			continue;
881 
882 		vmode.v_modeattr = le16toh(vmode.v_modeattr);
883 		vmode.v_wgran = le16toh(vmode.v_wgran);
884 		vmode.v_wsize = le16toh(vmode.v_wsize);
885 		vmode.v_waseg = le16toh(vmode.v_waseg);
886 		vmode.v_wbseg = le16toh(vmode.v_wbseg);
887 		vmode.v_posfunc = le32toh(vmode.v_posfunc);
888 		vmode.v_bpscanline = le16toh(vmode.v_bpscanline);
889 		vmode.v_width = le16toh(vmode.v_width);
890 		vmode.v_height = le16toh(vmode.v_height);
891 		vmode.v_lfb = le32toh(vmode.v_lfb);
892 		vmode.v_offscreen = le32toh(vmode.v_offscreen);
893 		vmode.v_offscreensize = le16toh(vmode.v_offscreensize);
894 		vmode.v_linbpscanline = le16toh(vmode.v_linbpscanline);
895 		vmode.v_maxpixelclock = le32toh(vmode.v_maxpixelclock);
896 
897 		/* reject unsupported modes */
898 #if 0
899 		if ((vmode.v_modeattr &
900 		    (V_MODESUPP | V_MODEOPTINFO | V_MODENONVGA)) !=
901 		    (V_MODESUPP | V_MODEOPTINFO))
902 			continue;
903 #else
904 		if ((vmode.v_modeattr & V_MODEOPTINFO) == 0) {
905 #if VESA_DEBUG > 1
906 			printf("Rejecting VESA %s mode: %d x %d x %d bpp "
907 			    " attr = %x\n",
908 			    vmode.v_modeattr & V_MODEGRAPHICS ?
909 			    "graphics" : "text",
910 			    vmode.v_width, vmode.v_height, vmode.v_bpp,
911 			    vmode.v_modeattr);
912 #endif
913 			continue;
914 		}
915 #endif
916 
917 		bsize = vesa_get_bpscanline(&vmode) * vmode.v_height;
918 		if ((vmode.v_modeattr & V_MODEGRAPHICS) != 0)
919 			bsize *= vmode.v_planes;
920 
921 		/* Does it have enough memory to support this mode? */
922 		if (msize < bsize) {
923 #if VESA_DEBUG > 1
924 			printf("Rejecting VESA %s mode: %d x %d x %d bpp "
925 			    " attr = %x, not enough memory\n",
926 			    vmode.v_modeattr & V_MODEGRAPHICS ?
927 			    "graphics" : "text",
928 			    vmode.v_width, vmode.v_height, vmode.v_bpp,
929 			    vmode.v_modeattr);
930 #endif
931 			continue;
932 		}
933 
934 		/* expand the array if necessary */
935 		if (modes >= vesa_vmode_max) {
936 			vesa_vmode_max += MODE_TABLE_DELTA;
937 			p = malloc(sizeof(*vesa_vmode) * (vesa_vmode_max + 1),
938 			    M_DEVBUF, M_WAITOK);
939 #if VESA_DEBUG > 1
940 			printf("vesa_bios_init(): modes:%d, vesa_mode_max:%d\n",
941 			    modes, vesa_vmode_max);
942 #endif
943 			if (modes > 0) {
944 				bcopy(vesa_vmode, p, sizeof(*vesa_vmode)*modes);
945 				free(vesa_vmode, M_DEVBUF);
946 			}
947 			vesa_vmode = p;
948 		}
949 
950 #if VESA_DEBUG > 1
951 		printf("Found VESA %s mode: %d x %d x %d bpp\n",
952 		    vmode.v_modeattr & V_MODEGRAPHICS ? "graphics" : "text",
953 		    vmode.v_width, vmode.v_height, vmode.v_bpp);
954 #endif
955 		if (is_via_cle266) {
956 		    if ((vmode.v_width & 0xff00) >> 8 == vmode.v_height - 1) {
957 			vmode.v_width &= 0xff;
958 			vmode.v_waseg = 0xb8000 >> 4;
959 		    }
960 		}
961 
962 		/* copy some fields */
963 		bzero(&vesa_vmode[modes], sizeof(vesa_vmode[modes]));
964 		vesa_vmode[modes].vi_mode = vesa_vmodetab[i];
965 		vesa_vmode[modes].vi_width = vmode.v_width;
966 		vesa_vmode[modes].vi_height = vmode.v_height;
967 		vesa_vmode[modes].vi_depth = vmode.v_bpp;
968 		vesa_vmode[modes].vi_planes = vmode.v_planes;
969 		vesa_vmode[modes].vi_cwidth = vmode.v_cwidth;
970 		vesa_vmode[modes].vi_cheight = vmode.v_cheight;
971 		vesa_vmode[modes].vi_window = (vm_offset_t)vmode.v_waseg << 4;
972 		/* XXX window B */
973 		vesa_vmode[modes].vi_window_size = vmode.v_wsize * 1024;
974 		vesa_vmode[modes].vi_window_gran = vmode.v_wgran * 1024;
975 		if (vmode.v_modeattr & V_MODELFB)
976 			vesa_vmode[modes].vi_buffer = vmode.v_lfb;
977 		vesa_vmode[modes].vi_buffer_size = bsize;
978 		vesa_vmode[modes].vi_mem_model =
979 		    vesa_translate_mmodel(vmode.v_memmodel);
980 		switch (vesa_vmode[modes].vi_mem_model) {
981 		case V_INFO_MM_DIRECT:
982 			if ((vmode.v_modeattr & V_MODELFB) != 0 &&
983 			    vers >= 0x0300) {
984 				vesa_vmode[modes].vi_pixel_fields[0] =
985 				    vmode.v_linredfieldpos;
986 				vesa_vmode[modes].vi_pixel_fields[1] =
987 				    vmode.v_lingreenfieldpos;
988 				vesa_vmode[modes].vi_pixel_fields[2] =
989 				    vmode.v_linbluefieldpos;
990 				vesa_vmode[modes].vi_pixel_fields[3] =
991 				    vmode.v_linresfieldpos;
992 				vesa_vmode[modes].vi_pixel_fsizes[0] =
993 				    vmode.v_linredmasksize;
994 				vesa_vmode[modes].vi_pixel_fsizes[1] =
995 				    vmode.v_lingreenmasksize;
996 				vesa_vmode[modes].vi_pixel_fsizes[2] =
997 				    vmode.v_linbluemasksize;
998 				vesa_vmode[modes].vi_pixel_fsizes[3] =
999 				    vmode.v_linresmasksize;
1000 			} else {
1001 				vesa_vmode[modes].vi_pixel_fields[0] =
1002 				    vmode.v_redfieldpos;
1003 				vesa_vmode[modes].vi_pixel_fields[1] =
1004 				    vmode.v_greenfieldpos;
1005 				vesa_vmode[modes].vi_pixel_fields[2] =
1006 				    vmode.v_bluefieldpos;
1007 				vesa_vmode[modes].vi_pixel_fields[3] =
1008 				    vmode.v_resfieldpos;
1009 				vesa_vmode[modes].vi_pixel_fsizes[0] =
1010 				    vmode.v_redmasksize;
1011 				vesa_vmode[modes].vi_pixel_fsizes[1] =
1012 				    vmode.v_greenmasksize;
1013 				vesa_vmode[modes].vi_pixel_fsizes[2] =
1014 				    vmode.v_bluemasksize;
1015 				vesa_vmode[modes].vi_pixel_fsizes[3] =
1016 				    vmode.v_resmasksize;
1017 			}
1018 			/* FALLTHROUGH */
1019 		case V_INFO_MM_PACKED:
1020 			vesa_vmode[modes].vi_pixel_size = (vmode.v_bpp + 7) / 8;
1021 			break;
1022 		}
1023 		vesa_vmode[modes].vi_flags =
1024 		    vesa_translate_flags(vmode.v_modeattr) | V_INFO_VESA;
1025 
1026 		++modes;
1027 	}
1028 	vesa_vmode[modes].vi_mode = EOT;
1029 
1030 	if (bootverbose)
1031 		printf("VESA: %d mode(s) found\n", modes);
1032 
1033 	has_vesa_bios = (modes > 0);
1034 	if (!has_vesa_bios)
1035 		goto fail;
1036 
1037 	x86bios_free(vmbuf, sizeof(*buf));
1038 
1039 	/* Probe supported save/restore states. */
1040 	for (i = 0; i < 4; i++)
1041 		if (vesa_bios_state_buf_size(1 << i) > 0)
1042 			vesa_state |= 1 << i;
1043 	if (vesa_state != 0)
1044 		vesa_state_buf_size = vesa_bios_state_buf_size(vesa_state);
1045 	vesa_palette = x86bios_alloc(&vesa_palette_offs,
1046 	    VESA_PALETTE_SIZE + vesa_state_buf_size, M_WAITOK);
1047 	if (vesa_state_buf_size > 0) {
1048 		vesa_state_buf = vesa_palette + VESA_PALETTE_SIZE;
1049 		vesa_state_buf_offs = vesa_palette_offs + VESA_PALETTE_SIZE;
1050 	}
1051 
1052 	return (0);
1053 
1054 fail:
1055 	if (vesa_bios != NULL) {
1056 		x86bios_set_intr(0x10, vesa_bios_int10);
1057 		vesa_bios_offs = VESA_BIOS_OFFSET;
1058 		x86bios_free(vesa_bios, vesa_bios_size);
1059 		vesa_bios = NULL;
1060 	}
1061 	if (vmbuf != NULL)
1062 		x86bios_free(vmbuf, sizeof(buf));
1063 	if (vesa_adp_info != NULL) {
1064 		free(vesa_adp_info, M_DEVBUF);
1065 		vesa_adp_info = NULL;
1066 	}
1067 	if (vesa_oemstr != NULL) {
1068 		free(vesa_oemstr, M_DEVBUF);
1069 		vesa_oemstr = NULL;
1070 	}
1071 	if (vesa_venderstr != NULL) {
1072 		free(vesa_venderstr, M_DEVBUF);
1073 		vesa_venderstr = NULL;
1074 	}
1075 	if (vesa_prodstr != NULL) {
1076 		free(vesa_prodstr, M_DEVBUF);
1077 		vesa_prodstr = NULL;
1078 	}
1079 	if (vesa_revstr != NULL) {
1080 		free(vesa_revstr, M_DEVBUF);
1081 		vesa_revstr = NULL;
1082 	}
1083 	return (1);
1084 }
1085 
1086 static void
1087 vesa_clear_modes(video_info_t *info, int color)
1088 {
1089 	while (info->vi_mode != EOT) {
1090 		if ((info->vi_flags & V_INFO_COLOR) != color)
1091 			info->vi_mode = NA;
1092 		++info;
1093 	}
1094 }
1095 
1096 /* entry points */
1097 
1098 static int
1099 vesa_configure(int flags)
1100 {
1101 	video_adapter_t *adp;
1102 	int adapters;
1103 	int error;
1104 	int i;
1105 
1106 	if (vesa_init_done)
1107 		return (0);
1108 	if (flags & VIO_PROBE_ONLY)
1109 		return (0);
1110 
1111 	/*
1112 	 * If the VESA module has already been loaded, abort loading
1113 	 * the module this time.
1114 	 */
1115 	for (i = 0; (adp = vid_get_adapter(i)) != NULL; ++i) {
1116 		if (adp->va_flags & V_ADP_VESA)
1117 			return (ENXIO);
1118 		if (adp->va_type == KD_VGA)
1119 			break;
1120 	}
1121 
1122 	/*
1123 	 * The VGA adapter is not found.  This is because either
1124 	 * 1) the VGA driver has not been initialized, or 2) the VGA card
1125 	 * is not present.  If 1) is the case, we shall defer
1126 	 * initialization for now and try again later.
1127 	 */
1128 	if (adp == NULL) {
1129 		vga_sub_configure = vesa_configure;
1130 		return (ENODEV);
1131 	}
1132 
1133 	/* count number of registered adapters */
1134 	for (++i; vid_get_adapter(i) != NULL; ++i)
1135 		;
1136 	adapters = i;
1137 
1138 	/* call VESA BIOS */
1139 	vesa_adp = adp;
1140 	if (vesa_bios_init()) {
1141 		vesa_adp = NULL;
1142 		return (ENXIO);
1143 	}
1144 	vesa_adp->va_flags |= V_ADP_VESA;
1145 
1146 	/* remove conflicting modes if we have more than one adapter */
1147 	if (adapters > 1) {
1148 		vesa_clear_modes(vesa_vmode,
1149 				 (vesa_adp->va_flags & V_ADP_COLOR) ?
1150 				     V_INFO_COLOR : 0);
1151 	}
1152 
1153 	if ((error = vesa_load_ioctl()) == 0) {
1154 		prevvidsw = vidsw[vesa_adp->va_index];
1155 		vidsw[vesa_adp->va_index] = &vesavidsw;
1156 		vesa_init_done = TRUE;
1157 	} else {
1158 		vesa_adp = NULL;
1159 		return (error);
1160 	}
1161 
1162 	return (0);
1163 }
1164 
1165 #if 0
1166 static int
1167 vesa_nop(void)
1168 {
1169 
1170 	return (0);
1171 }
1172 #endif
1173 
1174 static int
1175 vesa_error(void)
1176 {
1177 
1178 	return (1);
1179 }
1180 
1181 static int
1182 vesa_probe(int unit, video_adapter_t **adpp, void *arg, int flags)
1183 {
1184 
1185 	return ((*prevvidsw->probe)(unit, adpp, arg, flags));
1186 }
1187 
1188 static int
1189 vesa_init(int unit, video_adapter_t *adp, int flags)
1190 {
1191 
1192 	return ((*prevvidsw->init)(unit, adp, flags));
1193 }
1194 
1195 static int
1196 vesa_get_info(video_adapter_t *adp, int mode, video_info_t *info)
1197 {
1198 	int i;
1199 
1200 	if ((*prevvidsw->get_info)(adp, mode, info) == 0)
1201 		return (0);
1202 
1203 	if (adp != vesa_adp)
1204 		return (1);
1205 
1206 	mode = vesa_map_gen_mode_num(vesa_adp->va_type,
1207 				     vesa_adp->va_flags & V_ADP_COLOR, mode);
1208 	for (i = 0; vesa_vmode[i].vi_mode != EOT; ++i) {
1209 		if (vesa_vmode[i].vi_mode == NA)
1210 			continue;
1211 		if (vesa_vmode[i].vi_mode == mode) {
1212 			*info = vesa_vmode[i];
1213 			return (0);
1214 		}
1215 	}
1216 	return (1);
1217 }
1218 
1219 static int
1220 vesa_query_mode(video_adapter_t *adp, video_info_t *info)
1221 {
1222 	int i;
1223 
1224 	if ((*prevvidsw->query_mode)(adp, info) == 0)
1225 		return (0);
1226 	if (adp != vesa_adp)
1227 		return (ENODEV);
1228 
1229 	for (i = 0; vesa_vmode[i].vi_mode != EOT; ++i) {
1230 		if ((info->vi_width != 0)
1231 		    && (info->vi_width != vesa_vmode[i].vi_width))
1232 			continue;
1233 		if ((info->vi_height != 0)
1234 		    && (info->vi_height != vesa_vmode[i].vi_height))
1235 			continue;
1236 		if ((info->vi_cwidth != 0)
1237 		    && (info->vi_cwidth != vesa_vmode[i].vi_cwidth))
1238 			continue;
1239 		if ((info->vi_cheight != 0)
1240 		    && (info->vi_cheight != vesa_vmode[i].vi_cheight))
1241 			continue;
1242 		if ((info->vi_depth != 0)
1243 		    && (info->vi_depth != vesa_vmode[i].vi_depth))
1244 			continue;
1245 		if ((info->vi_planes != 0)
1246 		    && (info->vi_planes != vesa_vmode[i].vi_planes))
1247 			continue;
1248 		/* pixel format, memory model */
1249 		if ((info->vi_flags != 0)
1250 		    && (info->vi_flags != vesa_vmode[i].vi_flags))
1251 			continue;
1252 		*info = vesa_vmode[i];
1253 		return (0);
1254 	}
1255 	return (ENODEV);
1256 }
1257 
1258 static int
1259 vesa_set_mode(video_adapter_t *adp, int mode)
1260 {
1261 	video_info_t info;
1262 
1263 	if (adp != vesa_adp)
1264 		return ((*prevvidsw->set_mode)(adp, mode));
1265 
1266 	mode = vesa_map_gen_mode_num(adp->va_type,
1267 				     adp->va_flags & V_ADP_COLOR, mode);
1268 #if VESA_DEBUG > 0
1269 	printf("VESA: set_mode(): %d(%x) -> %d(%x)\n",
1270 		adp->va_mode, adp->va_mode, mode, mode);
1271 #endif
1272 	/*
1273 	 * If the current mode is a VESA mode and the new mode is not,
1274 	 * restore the state of the adapter first by setting one of the
1275 	 * standard VGA mode, so that non-standard, extended SVGA registers
1276 	 * are set to the state compatible with the standard VGA modes.
1277 	 * Otherwise (*prevvidsw->set_mode)() may not be able to set up
1278 	 * the new mode correctly.
1279 	 */
1280 	if (VESA_MODE(adp->va_mode)) {
1281 		if (!VESA_MODE(mode) &&
1282 		    (*prevvidsw->get_info)(adp, mode, &info) == 0) {
1283 			if ((adp->va_flags & V_ADP_DAC8) != 0) {
1284 				vesa_bios_set_dac(6);
1285 				adp->va_flags &= ~V_ADP_DAC8;
1286 			}
1287 			int10_set_mode(adp->va_initial_bios_mode);
1288 			if (adp->va_info.vi_flags & V_INFO_LINEAR)
1289 				pmap_unmapdev(adp->va_buffer,
1290 				    vesa_adp_info->v_memsize * 64 * 1024);
1291 			/*
1292 			 * Once (*prevvidsw->get_info)() succeeded,
1293 			 * (*prevvidsw->set_mode)() below won't fail...
1294 			 */
1295 		}
1296 	}
1297 
1298 	/* we may not need to handle this mode after all... */
1299 	if (!VESA_MODE(mode) && (*prevvidsw->set_mode)(adp, mode) == 0)
1300 		return (0);
1301 
1302 	/* is the new mode supported? */
1303 	if (vesa_get_info(adp, mode, &info))
1304 		return (1);
1305 	/* assert(VESA_MODE(mode)); */
1306 
1307 #if VESA_DEBUG > 0
1308 	printf("VESA: about to set a VESA mode...\n");
1309 #endif
1310 	/* don't use the linear frame buffer for text modes. XXX */
1311 	if (!(info.vi_flags & V_INFO_GRAPHICS))
1312 		info.vi_flags &= ~V_INFO_LINEAR;
1313 
1314 	if ((info.vi_flags & V_INFO_LINEAR) != 0)
1315 		mode |= 0x4000;
1316 	if (vesa_bios_set_mode(mode))
1317 		return (1);
1318 
1319 	/* Palette format is reset by the above VBE function call. */
1320 	adp->va_flags &= ~V_ADP_DAC8;
1321 
1322 	if ((vesa_adp_info->v_flags & V_DAC8) != 0 &&
1323 	    (info.vi_flags & V_INFO_GRAPHICS) != 0 &&
1324 	    vesa_bios_set_dac(8) > 6)
1325 		adp->va_flags |= V_ADP_DAC8;
1326 
1327 	if (adp->va_info.vi_flags & V_INFO_LINEAR)
1328 		pmap_unmapdev(adp->va_buffer,
1329 		    vesa_adp_info->v_memsize * 64 * 1024);
1330 
1331 #if VESA_DEBUG > 0
1332 	printf("VESA: mode set!\n");
1333 #endif
1334 	vesa_adp->va_mode = mode & 0x1ff;	/* Mode number is 9-bit. */
1335 	vesa_adp->va_flags &= ~V_ADP_COLOR;
1336 	vesa_adp->va_flags |=
1337 		(info.vi_flags & V_INFO_COLOR) ? V_ADP_COLOR : 0;
1338 	vesa_adp->va_crtc_addr =
1339 		(vesa_adp->va_flags & V_ADP_COLOR) ? COLOR_CRTC : MONO_CRTC;
1340 
1341 	vesa_adp->va_line_width = info.vi_buffer_size / info.vi_height;
1342 	if ((info.vi_flags & V_INFO_GRAPHICS) != 0)
1343 		vesa_adp->va_line_width /= info.vi_planes;
1344 
1345 #ifdef MODE_TABLE_BROKEN
1346 	/* If VBE function returns bigger bytes per scan line, use it. */
1347 	{
1348 		int bpsl = vesa_bios_get_line_length();
1349 		if (bpsl > vesa_adp->va_line_width) {
1350 			vesa_adp->va_line_width = bpsl;
1351 			info.vi_buffer_size = bpsl * info.vi_height;
1352 			if ((info.vi_flags & V_INFO_GRAPHICS) != 0)
1353 				info.vi_buffer_size *= info.vi_planes;
1354 		}
1355 	}
1356 #endif
1357 
1358 	if (info.vi_flags & V_INFO_LINEAR) {
1359 #if VESA_DEBUG > 1
1360 		printf("VESA: setting up LFB\n");
1361 #endif
1362 		vesa_adp->va_buffer =
1363 		    (vm_offset_t)pmap_mapdev_attr(info.vi_buffer,
1364 		    vesa_adp_info->v_memsize * 64 * 1024, PAT_WRITE_COMBINING);
1365 		vesa_adp->va_window = vesa_adp->va_buffer;
1366 		vesa_adp->va_window_size = info.vi_buffer_size / info.vi_planes;
1367 		vesa_adp->va_window_gran = info.vi_buffer_size / info.vi_planes;
1368 	} else {
1369 		vesa_adp->va_buffer = 0;
1370 		vesa_adp->va_window = (vm_offset_t)x86bios_offset(info.vi_window);
1371 		vesa_adp->va_window_size = info.vi_window_size;
1372 		vesa_adp->va_window_gran = info.vi_window_gran;
1373 	}
1374 	vesa_adp->va_buffer_size = info.vi_buffer_size;
1375 	vesa_adp->va_window_orig = 0;
1376 	vesa_adp->va_disp_start.x = 0;
1377 	vesa_adp->va_disp_start.y = 0;
1378 #if VESA_DEBUG > 0
1379 	printf("vesa_set_mode(): vi_width:%d, line_width:%d\n",
1380 	       info.vi_width, vesa_adp->va_line_width);
1381 #endif
1382 	bcopy(&info, &vesa_adp->va_info, sizeof(vesa_adp->va_info));
1383 
1384 	/* move hardware cursor out of the way */
1385 	(*vidsw[vesa_adp->va_index]->set_hw_cursor)(vesa_adp, -1, -1);
1386 
1387 	return (0);
1388 }
1389 
1390 static int
1391 vesa_save_font(video_adapter_t *adp, int page, int fontsize, int fontwidth,
1392 	       u_char *data, int ch, int count)
1393 {
1394 
1395 	return ((*prevvidsw->save_font)(adp, page, fontsize, fontwidth, data,
1396 	    ch, count));
1397 }
1398 
1399 static int
1400 vesa_load_font(video_adapter_t *adp, int page, int fontsize, int fontwidth,
1401 	       u_char *data, int ch, int count)
1402 {
1403 
1404 	return ((*prevvidsw->load_font)(adp, page, fontsize, fontwidth, data,
1405 		ch, count));
1406 }
1407 
1408 static int
1409 vesa_show_font(video_adapter_t *adp, int page)
1410 {
1411 
1412 	return ((*prevvidsw->show_font)(adp, page));
1413 }
1414 
1415 static int
1416 vesa_save_palette(video_adapter_t *adp, u_char *palette)
1417 {
1418 	int bits;
1419 
1420 	if (adp == vesa_adp && VESA_MODE(adp->va_mode)) {
1421 		bits = (adp->va_flags & V_ADP_DAC8) != 0 ? 8 : 6;
1422 		if (vesa_bios_save_palette(0, 256, palette, bits) == 0)
1423 			return (0);
1424 	}
1425 
1426 	return ((*prevvidsw->save_palette)(adp, palette));
1427 }
1428 
1429 static int
1430 vesa_load_palette(video_adapter_t *adp, u_char *palette)
1431 {
1432 	int bits;
1433 
1434 	if (adp == vesa_adp && VESA_MODE(adp->va_mode)) {
1435 		bits = (adp->va_flags & V_ADP_DAC8) != 0 ? 8 : 6;
1436 		if (vesa_bios_load_palette(0, 256, palette, bits) == 0)
1437 			return (0);
1438 	}
1439 
1440 	return ((*prevvidsw->load_palette)(adp, palette));
1441 }
1442 
1443 static int
1444 vesa_set_border(video_adapter_t *adp, int color)
1445 {
1446 
1447 	return ((*prevvidsw->set_border)(adp, color));
1448 }
1449 
1450 static int
1451 vesa_save_state(video_adapter_t *adp, void *p, size_t size)
1452 {
1453 
1454 	if (adp != vesa_adp || vesa_state_buf_size == 0)
1455 		return ((*prevvidsw->save_state)(adp, p, size));
1456 
1457 	if (size == 0)
1458 		return (offsetof(adp_state_t, regs) + vesa_state_buf_size);
1459 	if (size < (offsetof(adp_state_t, regs) + vesa_state_buf_size))
1460 		return (EINVAL);
1461 
1462 	((adp_state_t *)p)->sig = V_STATE_SIG;
1463 	bzero(((adp_state_t *)p)->regs, vesa_state_buf_size);
1464 	return (vesa_bios_save_restore(STATE_SAVE, ((adp_state_t *)p)->regs));
1465 }
1466 
1467 static int
1468 vesa_load_state(video_adapter_t *adp, void *p)
1469 {
1470 	int mode;
1471 
1472 	if (adp != vesa_adp)
1473 		return ((*prevvidsw->load_state)(adp, p));
1474 
1475 	/* Try BIOS POST to restore a sane state. */
1476 	(void)vesa_bios_post();
1477 	mode = adp->va_mode;
1478 	(void)vesa_set_mode(adp, adp->va_initial_mode);
1479 	if (mode != adp->va_initial_mode)
1480 		(void)vesa_set_mode(adp, mode);
1481 
1482 	if (((adp_state_t *)p)->sig != V_STATE_SIG)
1483 		return ((*prevvidsw->load_state)(adp, p));
1484 	return (vesa_bios_save_restore(STATE_LOAD, ((adp_state_t *)p)->regs));
1485 }
1486 
1487 #if 0
1488 static int
1489 vesa_get_origin(video_adapter_t *adp, off_t *offset)
1490 {
1491 	x86regs_t regs;
1492 
1493 	x86bios_init_regs(&regs);
1494 	regs.R_AX = 0x4f05;
1495 	regs.R_BL = 0x10;
1496 
1497 	x86bios_intr(&regs, 0x10);
1498 
1499 	if (regs.R_AX != 0x004f)
1500 		return (1);
1501 	*offset = regs.DX * adp->va_window_gran;
1502 
1503 	return (0);
1504 }
1505 #endif
1506 
1507 static int
1508 vesa_set_origin(video_adapter_t *adp, off_t offset)
1509 {
1510 	x86regs_t regs;
1511 
1512 	/*
1513 	 * This function should return as quickly as possible to
1514 	 * maintain good performance of the system. For this reason,
1515 	 * error checking is kept minimal and let the VESA BIOS to
1516 	 * detect error.
1517 	 */
1518 	if (adp != vesa_adp)
1519 		return ((*prevvidsw->set_win_org)(adp, offset));
1520 
1521 	/* if this is a linear frame buffer, do nothing */
1522 	if (adp->va_info.vi_flags & V_INFO_LINEAR)
1523 		return (0);
1524 	/* XXX */
1525 	if (adp->va_window_gran == 0)
1526 		return (1);
1527 
1528 	x86bios_init_regs(&regs);
1529 	regs.R_AX = 0x4f05;
1530 	regs.R_DX = offset / adp->va_window_gran;
1531 
1532 	x86bios_intr(&regs, 0x10);
1533 
1534 	if (regs.R_AX != 0x004f)
1535 		return (1);
1536 
1537 	x86bios_init_regs(&regs);
1538 	regs.R_AX = 0x4f05;
1539 	regs.R_BL = 1;
1540 	regs.R_DX = offset / adp->va_window_gran;
1541 	x86bios_intr(&regs, 0x10);
1542 
1543 	adp->va_window_orig = (offset/adp->va_window_gran)*adp->va_window_gran;
1544 	return (0);			/* XXX */
1545 }
1546 
1547 static int
1548 vesa_read_hw_cursor(video_adapter_t *adp, int *col, int *row)
1549 {
1550 
1551 	return ((*prevvidsw->read_hw_cursor)(adp, col, row));
1552 }
1553 
1554 static int
1555 vesa_set_hw_cursor(video_adapter_t *adp, int col, int row)
1556 {
1557 
1558 	return ((*prevvidsw->set_hw_cursor)(adp, col, row));
1559 }
1560 
1561 static int
1562 vesa_set_hw_cursor_shape(video_adapter_t *adp, int base, int height,
1563 			 int celsize, int blink)
1564 {
1565 
1566 	return ((*prevvidsw->set_hw_cursor_shape)(adp, base, height, celsize,
1567 	    blink));
1568 }
1569 
1570 static int
1571 vesa_blank_display(video_adapter_t *adp, int mode)
1572 {
1573 
1574 	/* XXX: use VESA DPMS */
1575 	return ((*prevvidsw->blank_display)(adp, mode));
1576 }
1577 
1578 static int
1579 vesa_mmap(video_adapter_t *adp, vm_ooffset_t offset, vm_paddr_t *paddr,
1580 	  int prot, vm_memattr_t *memattr)
1581 {
1582 
1583 #if VESA_DEBUG > 0
1584 	printf("vesa_mmap(): window:0x%tx, buffer:0x%tx, offset:0x%jx\n",
1585 	       adp->va_info.vi_window, adp->va_info.vi_buffer, offset);
1586 #endif
1587 
1588 	if ((adp == vesa_adp) &&
1589 	    (adp->va_info.vi_flags & V_INFO_LINEAR) != 0) {
1590 		/* va_window_size == va_buffer_size/vi_planes */
1591 		/* XXX: is this correct? */
1592 		if (offset > adp->va_window_size - PAGE_SIZE)
1593 			return (-1);
1594 		*paddr = adp->va_info.vi_buffer + offset;
1595 		return (0);
1596 	}
1597 	return ((*prevvidsw->mmap)(adp, offset, paddr, prot, memattr));
1598 }
1599 
1600 static int
1601 vesa_clear(video_adapter_t *adp)
1602 {
1603 
1604 	return ((*prevvidsw->clear)(adp));
1605 }
1606 
1607 static int
1608 vesa_fill_rect(video_adapter_t *adp, int val, int x, int y, int cx, int cy)
1609 {
1610 
1611 	return ((*prevvidsw->fill_rect)(adp, val, x, y, cx, cy));
1612 }
1613 
1614 static int
1615 vesa_bitblt(video_adapter_t *adp,...)
1616 {
1617 
1618 	/* FIXME */
1619 	return (1);
1620 }
1621 
1622 static int
1623 get_palette(video_adapter_t *adp, int base, int count,
1624 	    u_char *red, u_char *green, u_char *blue, u_char *trans)
1625 {
1626 	u_char *r;
1627 	u_char *g;
1628 	u_char *b;
1629 	int bits;
1630 	int error;
1631 
1632 	if (base < 0 || base >= 256 || count < 0 || count > 256)
1633 		return (1);
1634 	if ((base + count) > 256)
1635 		return (1);
1636 	if (!VESA_MODE(adp->va_mode))
1637 		return (1);
1638 
1639 	bits = (adp->va_flags & V_ADP_DAC8) != 0 ? 8 : 6;
1640 	r = malloc(count * 3, M_DEVBUF, M_WAITOK);
1641 	g = r + count;
1642 	b = g + count;
1643 	error = vesa_bios_save_palette2(base, count, r, g, b, bits);
1644 	if (error == 0) {
1645 		copyout(r, red, count);
1646 		copyout(g, green, count);
1647 		copyout(b, blue, count);
1648 		if (trans != NULL) {
1649 			bzero(r, count);
1650 			copyout(r, trans, count);
1651 		}
1652 	}
1653 	free(r, M_DEVBUF);
1654 
1655 	return (error);
1656 }
1657 
1658 static int
1659 set_palette(video_adapter_t *adp, int base, int count,
1660 	    u_char *red, u_char *green, u_char *blue, u_char *trans)
1661 {
1662 	u_char *r;
1663 	u_char *g;
1664 	u_char *b;
1665 	int bits;
1666 	int error;
1667 
1668 	if (base < 0 || base >= 256 || count < 0 || count > 256)
1669 		return (1);
1670 	if ((base + count) > 256)
1671 		return (1);
1672 	if (!VESA_MODE(adp->va_mode))
1673 		return (1);
1674 
1675 	bits = (adp->va_flags & V_ADP_DAC8) != 0 ? 8 : 6;
1676 	r = malloc(count * 3, M_DEVBUF, M_WAITOK);
1677 	g = r + count;
1678 	b = g + count;
1679 	copyin(red, r, count);
1680 	copyin(green, g, count);
1681 	copyin(blue, b, count);
1682 
1683 	error = vesa_bios_load_palette2(base, count, r, g, b, bits);
1684 	free(r, M_DEVBUF);
1685 
1686 	return (error);
1687 }
1688 
1689 static int
1690 vesa_ioctl(video_adapter_t *adp, u_long cmd, caddr_t arg)
1691 {
1692 	int bytes;
1693 
1694 	if (adp != vesa_adp)
1695 		return ((*prevvidsw->ioctl)(adp, cmd, arg));
1696 
1697 	switch (cmd) {
1698 	case FBIO_SETWINORG:	/* set frame buffer window origin */
1699 		if (!VESA_MODE(adp->va_mode))
1700 			return (*prevvidsw->ioctl)(adp, cmd, arg);
1701 		return (vesa_set_origin(adp, *(off_t *)arg) ? ENODEV : 0);
1702 
1703 	case FBIO_SETDISPSTART:	/* set display start address */
1704 		if (!VESA_MODE(adp->va_mode))
1705 			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1706 		if (vesa_bios_set_start(((video_display_start_t *)arg)->x,
1707 					((video_display_start_t *)arg)->y))
1708 			return (ENODEV);
1709 		adp->va_disp_start.x = ((video_display_start_t *)arg)->x;
1710 		adp->va_disp_start.y = ((video_display_start_t *)arg)->y;
1711 		return (0);
1712 
1713 	case FBIO_SETLINEWIDTH:	/* set line length in pixel */
1714 		if (!VESA_MODE(adp->va_mode))
1715 			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1716 		if (vesa_bios_set_line_length(*(u_int *)arg, &bytes, NULL))
1717 			return (ENODEV);
1718 		adp->va_line_width = bytes;
1719 #if VESA_DEBUG > 1
1720 		printf("new line width:%d\n", adp->va_line_width);
1721 #endif
1722 		return (0);
1723 
1724 	case FBIO_GETPALETTE:	/* get color palette */
1725 		if (get_palette(adp, ((video_color_palette_t *)arg)->index,
1726 				((video_color_palette_t *)arg)->count,
1727 				((video_color_palette_t *)arg)->red,
1728 				((video_color_palette_t *)arg)->green,
1729 				((video_color_palette_t *)arg)->blue,
1730 				((video_color_palette_t *)arg)->transparent))
1731 			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1732 		return (0);
1733 
1734 
1735 	case FBIO_SETPALETTE:	/* set color palette */
1736 		if (set_palette(adp, ((video_color_palette_t *)arg)->index,
1737 				((video_color_palette_t *)arg)->count,
1738 				((video_color_palette_t *)arg)->red,
1739 				((video_color_palette_t *)arg)->green,
1740 				((video_color_palette_t *)arg)->blue,
1741 				((video_color_palette_t *)arg)->transparent))
1742 			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1743 		return (0);
1744 
1745 	case FBIOGETCMAP:	/* get color palette */
1746 		if (get_palette(adp, ((struct fbcmap *)arg)->index,
1747 				((struct fbcmap *)arg)->count,
1748 				((struct fbcmap *)arg)->red,
1749 				((struct fbcmap *)arg)->green,
1750 				((struct fbcmap *)arg)->blue, NULL))
1751 			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1752 		return (0);
1753 
1754 	case FBIOPUTCMAP:	/* set color palette */
1755 		if (set_palette(adp, ((struct fbcmap *)arg)->index,
1756 				((struct fbcmap *)arg)->count,
1757 				((struct fbcmap *)arg)->red,
1758 				((struct fbcmap *)arg)->green,
1759 				((struct fbcmap *)arg)->blue, NULL))
1760 			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1761 		return (0);
1762 
1763 	default:
1764 		return ((*prevvidsw->ioctl)(adp, cmd, arg));
1765 	}
1766 }
1767 
1768 static int
1769 vesa_diag(video_adapter_t *adp, int level)
1770 {
1771 	int error;
1772 
1773 	/* call the previous handler first */
1774 	error = (*prevvidsw->diag)(adp, level);
1775 	if (error)
1776 		return (error);
1777 
1778 	if (adp != vesa_adp)
1779 		return (1);
1780 
1781 	if (level <= 0)
1782 		return (0);
1783 
1784 	return (0);
1785 }
1786 
1787 static int
1788 vesa_bios_info(int level)
1789 {
1790 #if VESA_DEBUG > 1
1791 	struct vesa_mode vmode;
1792 	int i;
1793 #endif
1794 	uint16_t vers;
1795 
1796 	vers = vesa_adp_info->v_version;
1797 
1798 	if (bootverbose) {
1799 		/* general adapter information */
1800 		printf(
1801 	"VESA: v%d.%d, %dk memory, flags:0x%x, mode table:%p (%x)\n",
1802 		    (vers >> 12) * 10 + ((vers & 0x0f00) >> 8),
1803 		    ((vers & 0x00f0) >> 4) * 10 + (vers & 0x000f),
1804 		    vesa_adp_info->v_memsize * 64, vesa_adp_info->v_flags,
1805 		    vesa_vmodetab, vesa_adp_info->v_modetable);
1806 
1807 		/* OEM string */
1808 		if (vesa_oemstr != NULL)
1809 			printf("VESA: %s\n", vesa_oemstr);
1810 	}
1811 
1812 	if (level <= 0)
1813 		return (0);
1814 
1815 	if (vers >= 0x0200 && bootverbose) {
1816 		/* vender name, product name, product revision */
1817 		printf("VESA: %s %s %s\n",
1818 			(vesa_venderstr != NULL) ? vesa_venderstr : "unknown",
1819 			(vesa_prodstr != NULL) ? vesa_prodstr : "unknown",
1820 			(vesa_revstr != NULL) ? vesa_revstr : "?");
1821 	}
1822 
1823 #if VESA_DEBUG > 1
1824 	/* mode information */
1825 	for (i = 0;
1826 		(i < (M_VESA_MODE_MAX - M_VESA_BASE + 1))
1827 		&& (vesa_vmodetab[i] != 0xffff); ++i) {
1828 		if (vesa_bios_get_mode(vesa_vmodetab[i], &vmode, M_NOWAIT))
1829 			continue;
1830 
1831 		/* print something for diagnostic purpose */
1832 		printf("VESA: mode:0x%03x, flags:0x%04x",
1833 		       vesa_vmodetab[i], vmode.v_modeattr);
1834 		if (vmode.v_modeattr & V_MODEOPTINFO) {
1835 			if (vmode.v_modeattr & V_MODEGRAPHICS) {
1836 				printf(", G %dx%dx%d %d, ",
1837 				       vmode.v_width, vmode.v_height,
1838 				       vmode.v_bpp, vmode.v_planes);
1839 			} else {
1840 				printf(", T %dx%d, ",
1841 				       vmode.v_width, vmode.v_height);
1842 			}
1843 			printf("font:%dx%d, ",
1844 			       vmode.v_cwidth, vmode.v_cheight);
1845 			printf("pages:%d, mem:%d",
1846 			       vmode.v_ipages + 1, vmode.v_memmodel);
1847 		}
1848 		if (vmode.v_modeattr & V_MODELFB) {
1849 			printf("\nVESA: LFB:0x%x, off:0x%x, off_size:0x%x",
1850 			       vmode.v_lfb, vmode.v_offscreen,
1851 			       vmode.v_offscreensize*1024);
1852 		}
1853 		printf("\n");
1854 		printf("VESA: window A:0x%x (%x), window B:0x%x (%x), ",
1855 		       vmode.v_waseg, vmode.v_waattr,
1856 		       vmode.v_wbseg, vmode.v_wbattr);
1857 		printf("size:%dk, gran:%dk\n",
1858 		       vmode.v_wsize, vmode.v_wgran);
1859 	}
1860 #endif /* VESA_DEBUG > 1 */
1861 
1862 	return (0);
1863 }
1864 
1865 /* module loading */
1866 
1867 static int
1868 vesa_load(void)
1869 {
1870 	int error;
1871 
1872 	if (vesa_init_done)
1873 		return (0);
1874 
1875 	mtx_init(&vesa_lock, "VESA lock", NULL, MTX_DEF);
1876 
1877 	/* locate a VGA adapter */
1878 	vesa_adp = NULL;
1879 	error = vesa_configure(0);
1880 
1881 	if (error == 0)
1882 		vesa_bios_info(bootverbose);
1883 
1884 	return (error);
1885 }
1886 
1887 static int
1888 vesa_unload(void)
1889 {
1890 	u_char palette[256*3];
1891 	int error;
1892 
1893 	/* if the adapter is currently in a VESA mode, don't unload */
1894 	if ((vesa_adp != NULL) && VESA_MODE(vesa_adp->va_mode))
1895 		return (EBUSY);
1896 	/*
1897 	 * FIXME: if there is at least one vty which is in a VESA mode,
1898 	 * we shouldn't be unloading! XXX
1899 	 */
1900 
1901 	if ((error = vesa_unload_ioctl()) == 0) {
1902 		if (vesa_adp != NULL) {
1903 			if ((vesa_adp->va_flags & V_ADP_DAC8) != 0) {
1904 				vesa_bios_save_palette(0, 256, palette, 8);
1905 				vesa_bios_set_dac(6);
1906 				vesa_adp->va_flags &= ~V_ADP_DAC8;
1907 				vesa_bios_load_palette(0, 256, palette, 6);
1908 			}
1909 			vesa_adp->va_flags &= ~V_ADP_VESA;
1910 			vidsw[vesa_adp->va_index] = prevvidsw;
1911 		}
1912 	}
1913 
1914 	if (vesa_bios != NULL) {
1915 		x86bios_set_intr(0x10, vesa_bios_int10);
1916 		x86bios_free(vesa_bios, vesa_bios_size);
1917 	}
1918 	if (vesa_adp_info != NULL)
1919 		free(vesa_adp_info, M_DEVBUF);
1920 	if (vesa_oemstr != NULL)
1921 		free(vesa_oemstr, M_DEVBUF);
1922 	if (vesa_venderstr != NULL)
1923 		free(vesa_venderstr, M_DEVBUF);
1924 	if (vesa_prodstr != NULL)
1925 		free(vesa_prodstr, M_DEVBUF);
1926 	if (vesa_revstr != NULL)
1927 		free(vesa_revstr, M_DEVBUF);
1928 	if (vesa_vmode != &vesa_vmode_empty)
1929 		free(vesa_vmode, M_DEVBUF);
1930 	if (vesa_palette != NULL)
1931 		x86bios_free(vesa_palette,
1932 		    VESA_PALETTE_SIZE + vesa_state_buf_size);
1933 
1934 	mtx_destroy(&vesa_lock);
1935 
1936 	return (error);
1937 }
1938 
1939 static int
1940 vesa_mod_event(module_t mod, int type, void *data)
1941 {
1942 
1943 	switch (type) {
1944 	case MOD_LOAD:
1945 		return (vesa_load());
1946 	case MOD_UNLOAD:
1947 		return (vesa_unload());
1948 	}
1949 	return (EOPNOTSUPP);
1950 }
1951 
1952 static moduledata_t vesa_mod = {
1953 	"vesa",
1954 	vesa_mod_event,
1955 	NULL,
1956 };
1957 
1958 DECLARE_MODULE(vesa, vesa_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
1959 MODULE_DEPEND(vesa, x86bios, 1, 1, 1);
1960 
1961 #endif	/* VGA_NO_MODE_CHANGE */
1962