vesa.c revision 298848
119304Speter/*-
219304Speter * Copyright (c) 1998 Kazutaka YOKOTA and Michael Smith
319304Speter * Copyright (c) 2009-2013 Jung-uk Kim <jkim@FreeBSD.org>
419304Speter * All rights reserved.
519304Speter *
619304Speter * Redistribution and use in source and binary forms, with or without
719304Speter * modification, are permitted provided that the following conditions
819304Speter * are met:
919304Speter * 1. Redistributions of source code must retain the above copyright
1019304Speter *    notice, this list of conditions and the following disclaimer as
1119304Speter *    the first lines of this file unmodified.
1219304Speter * 2. Redistributions in binary form must reproduce the above copyright
1319304Speter *    notice, this list of conditions and the following disclaimer in the
1419304Speter *    documentation and/or other materials provided with the distribution.
1519304Speter *
1619304Speter * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
1719304Speter * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1819304Speter * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1919304Speter * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
2019304Speter * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
2119304Speter * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
2219304Speter * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
2319304Speter * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
2419304Speter * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
2519304Speter * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2619304Speter */
2719304Speter
2819304Speter#include <sys/cdefs.h>
2919304Speter__FBSDID("$FreeBSD: head/sys/dev/fb/vesa.c 298848 2016-04-30 14:41:18Z pfg $");
3019304Speter
3119304Speter#include "opt_vga.h"
3219304Speter#include "opt_vesa.h"
3319304Speter
3419304Speter#ifndef VGA_NO_MODE_CHANGE
3519304Speter
3619304Speter#include <sys/param.h>
3719304Speter#include <sys/bus.h>
3819304Speter#include <sys/systm.h>
3919304Speter#include <sys/kernel.h>
4019304Speter#include <sys/lock.h>
4119304Speter#include <sys/module.h>
4219304Speter#include <sys/malloc.h>
4319304Speter#include <sys/mutex.h>
4419304Speter#include <sys/fbio.h>
4519304Speter#include <sys/sysctl.h>
4619304Speter
4719304Speter#include <vm/vm.h>
4819304Speter#include <vm/vm_extern.h>
4919304Speter#include <vm/vm_kern.h>
5019304Speter#include <vm/vm_param.h>
5119304Speter#include <vm/pmap.h>
5219304Speter
5319304Speter#include <machine/pc/bios.h>
5419304Speter#include <dev/fb/vesa.h>
5519304Speter
5619304Speter#include <dev/fb/fbreg.h>
5719304Speter#include <dev/fb/vgareg.h>
5819304Speter
5919304Speter#include <dev/pci/pcivar.h>
6019304Speter
6119304Speter#include <isa/isareg.h>
6219304Speter
6319304Speter#include <compat/x86bios/x86bios.h>
6419304Speter
6519304Speter#define	VESA_BIOS_OFFSET	0xc0000
6619304Speter#define	VESA_PALETTE_SIZE	(256 * 4)
6719304Speter#define	VESA_VIA_CLE266		"VIA CLE266\r\n"
6819304Speter
6919304Speter#ifndef VESA_DEBUG
7019304Speter#define VESA_DEBUG	0
7119304Speter#endif
7219304Speter
7319304Speter/* VESA video adapter state buffer stub */
7419304Speterstruct adp_state {
7519304Speter	int		sig;
7619304Speter#define V_STATE_SIG	0x61736576
7719304Speter	u_char		regs[1];
7819304Speter};
7919304Spetertypedef struct adp_state adp_state_t;
8019304Speter
8119304Speterstatic struct mtx vesa_lock;
8219304Speter
8319304Speterstatic int vesa_state;
8419304Speterstatic void *vesa_state_buf;
8519304Speterstatic uint32_t vesa_state_buf_offs;
8619304Speterstatic size_t vesa_state_buf_size;
8719304Speter
8819304Speterstatic u_char *vesa_palette;
8919304Speterstatic uint32_t vesa_palette_offs;
9019304Speter
9119304Speterstatic void *vesa_vmem_buf;
9219304Speterstatic size_t vesa_vmem_max;
9319304Speter
9419304Speterstatic void *vesa_bios;
9519304Speterstatic uint32_t vesa_bios_offs;
9619304Speterstatic uint32_t vesa_bios_int10;
9719304Speterstatic size_t vesa_bios_size;
9819304Speter
9919304Speter/* VESA video adapter */
10019304Speterstatic video_adapter_t *vesa_adp;
10119304Speter
10219304Speterstatic SYSCTL_NODE(_debug, OID_AUTO, vesa, CTLFLAG_RD, NULL, "VESA debugging");
10319304Speterstatic int vesa_shadow_rom;
10419304SpeterSYSCTL_INT(_debug_vesa, OID_AUTO, shadow_rom, CTLFLAG_RDTUN, &vesa_shadow_rom,
10519304Speter    0, "Enable video BIOS shadow");
10619304Speter
10719304Speter/* VESA functions */
10819304Speter#if 0
10919304Speterstatic int			vesa_nop(void);
11019304Speter#endif
11119304Speterstatic int			vesa_error(void);
11219304Speterstatic vi_probe_t		vesa_probe;
11319304Speterstatic vi_init_t		vesa_init;
11419304Speterstatic vi_get_info_t		vesa_get_info;
11519304Speterstatic vi_query_mode_t		vesa_query_mode;
11619304Speterstatic vi_set_mode_t		vesa_set_mode;
11719304Speterstatic vi_save_font_t		vesa_save_font;
11819304Speterstatic vi_load_font_t		vesa_load_font;
11919304Speterstatic vi_show_font_t		vesa_show_font;
12019304Speterstatic vi_save_palette_t	vesa_save_palette;
12119304Speterstatic vi_load_palette_t	vesa_load_palette;
12219304Speterstatic vi_set_border_t		vesa_set_border;
12319304Speterstatic vi_save_state_t		vesa_save_state;
12419304Speterstatic vi_load_state_t		vesa_load_state;
12519304Speterstatic vi_set_win_org_t		vesa_set_origin;
12619304Speterstatic vi_read_hw_cursor_t	vesa_read_hw_cursor;
12719304Speterstatic vi_set_hw_cursor_t	vesa_set_hw_cursor;
12819304Speterstatic vi_set_hw_cursor_shape_t	vesa_set_hw_cursor_shape;
12919304Speterstatic vi_blank_display_t	vesa_blank_display;
13019304Speterstatic vi_mmap_t		vesa_mmap;
13119304Speterstatic vi_ioctl_t		vesa_ioctl;
13219304Speterstatic vi_clear_t		vesa_clear;
13319304Speterstatic vi_fill_rect_t		vesa_fill_rect;
13419304Speterstatic vi_bitblt_t		vesa_bitblt;
13519304Speterstatic vi_diag_t		vesa_diag;
13619304Speterstatic int			vesa_bios_info(int level);
13719304Speter
13819304Speterstatic video_switch_t vesavidsw = {
13919304Speter	vesa_probe,
14019304Speter	vesa_init,
14119304Speter	vesa_get_info,
14219304Speter	vesa_query_mode,
14319304Speter	vesa_set_mode,
14419304Speter	vesa_save_font,
14519304Speter	vesa_load_font,
14619304Speter	vesa_show_font,
14719304Speter	vesa_save_palette,
14819304Speter	vesa_load_palette,
14919304Speter	vesa_set_border,
15019304Speter	vesa_save_state,
15119304Speter	vesa_load_state,
15219304Speter	vesa_set_origin,
15319304Speter	vesa_read_hw_cursor,
15419304Speter	vesa_set_hw_cursor,
15519304Speter	vesa_set_hw_cursor_shape,
15619304Speter	vesa_blank_display,
15719304Speter	vesa_mmap,
15819304Speter	vesa_ioctl,
15919304Speter	vesa_clear,
16019304Speter	vesa_fill_rect,
16119304Speter	vesa_bitblt,
16219304Speter	vesa_error,
16319304Speter	vesa_error,
16419304Speter	vesa_diag,
16519304Speter};
16619304Speter
16719304Speterstatic video_switch_t *prevvidsw;
16819304Speter
16919304Speter/* VESA BIOS video modes */
17019304Speter#define VESA_MAXMODES	64
17119304Speter#define EOT		(-1)
17219304Speter#define NA		(-2)
17319304Speter
17419304Speter#define MODE_TABLE_DELTA 8
17519304Speter
17619304Speterstatic int vesa_vmode_max;
17719304Speterstatic video_info_t *vesa_vmode;
17819304Speter
17919304Speterstatic int vesa_init_done;
18019304Speterstatic struct vesa_info *vesa_adp_info;
18119304Speterstatic u_int16_t *vesa_vmodetab;
18219304Speterstatic char *vesa_oemstr;
18319304Speterstatic char *vesa_venderstr;
18419304Speterstatic char *vesa_prodstr;
18519304Speterstatic char *vesa_revstr;
18619304Speter
18719304Speter/* local macros and functions */
18819304Speter#define BIOS_SADDRTOLADDR(p) ((((p) & 0xffff0000) >> 12) + ((p) & 0x0000ffff))
18919304Speter
19019304Speterstatic int int10_set_mode(int mode);
19119304Speterstatic int vesa_bios_post(void);
19219304Speterstatic int vesa_bios_get_mode(int mode, struct vesa_mode *vmode, int flags);
19319304Speterstatic int vesa_bios_set_mode(int mode);
19419304Speter#if 0
19519304Speterstatic int vesa_bios_get_dac(void);
19619304Speter#endif
19719304Speterstatic int vesa_bios_set_dac(int bits);
19819304Speterstatic int vesa_bios_save_palette(int start, int colors, u_char *palette,
19919304Speter				  int bits);
20019304Speterstatic int vesa_bios_save_palette2(int start, int colors, u_char *r, u_char *g,
20119304Speter				   u_char *b, int bits);
20219304Speterstatic int vesa_bios_load_palette(int start, int colors, u_char *palette,
20319304Speter				  int bits);
20419304Speterstatic int vesa_bios_load_palette2(int start, int colors, u_char *r, u_char *g,
20519304Speter				   u_char *b, int bits);
20619304Speter#define STATE_SIZE	0
20719304Speter#define STATE_SAVE	1
20819304Speter#define STATE_LOAD	2
20919304Speterstatic size_t vesa_bios_state_buf_size(int);
21019304Speterstatic int vesa_bios_save_restore(int code, void *p);
21119304Speter#ifdef MODE_TABLE_BROKEN
21219304Speterstatic int vesa_bios_get_line_length(void);
21319304Speter#endif
21419304Speterstatic int vesa_bios_set_line_length(int pixel, int *bytes, int *lines);
21519304Speter#if 0
21619304Speterstatic int vesa_bios_get_start(int *x, int *y);
21719304Speter#endif
21819304Speterstatic int vesa_bios_set_start(int x, int y);
21919304Speterstatic int vesa_map_gen_mode_num(int type, int color, int mode);
22019304Speterstatic int vesa_translate_flags(u_int16_t vflags);
22119304Speterstatic int vesa_translate_mmodel(u_int8_t vmodel);
22219304Speterstatic int vesa_get_bpscanline(struct vesa_mode *vmode);
22319304Speterstatic int vesa_bios_init(void);
22419304Speterstatic void vesa_bios_uninit(void);
22519304Speterstatic void vesa_clear_modes(video_info_t *info, int color);
22619304Speter
22719304Speter#if 0
22819304Speterstatic int vesa_get_origin(video_adapter_t *adp, off_t *offset);
22919304Speter#endif
23019304Speter
23119304Speter/* INT 10 BIOS calls */
23219304Speterstatic int
23319304Speterint10_set_mode(int mode)
23419304Speter{
23519304Speter	x86regs_t regs;
23619304Speter
23719304Speter	x86bios_init_regs(&regs);
23819304Speter	regs.R_AL = mode;
23919304Speter
24019304Speter	x86bios_intr(&regs, 0x10);
24119304Speter
24219304Speter	return (0);
24319304Speter}
24419304Speter
24519304Speterstatic int
24619304Spetervesa_bios_post(void)
24719304Speter{
24819304Speter	x86regs_t regs;
24919304Speter	devclass_t dc;
25019304Speter	device_t *devs;
25119304Speter	device_t dev;
25219304Speter	int count, i, is_pci;
25319304Speter
25419304Speter	if (x86bios_get_orm(vesa_bios_offs) == NULL)
25519304Speter		return (1);
25619304Speter
25719304Speter	dev = NULL;
25819304Speter	is_pci = 0;
25919304Speter
26019304Speter	/* Find the matching PCI video controller. */
261	dc = devclass_find("vgapci");
262	if (dc != NULL && devclass_get_devices(dc, &devs, &count) == 0) {
263		for (i = 0; i < count; i++)
264			if (device_get_flags(devs[i]) != 0 &&
265			    x86bios_match_device(vesa_bios_offs, devs[i])) {
266				dev = devs[i];
267				is_pci = 1;
268				break;
269			}
270		free(devs, M_TEMP);
271	}
272
273	/* Try VGA if a PCI device is not found. */
274	if (dev == NULL) {
275		dc = devclass_find(VGA_DRIVER_NAME);
276		if (dc != NULL)
277			dev = devclass_get_device(dc, 0);
278	}
279
280	if (bootverbose)
281		printf("%s: calling BIOS POST\n",
282		    dev == NULL ? "VESA" : device_get_nameunit(dev));
283
284	x86bios_init_regs(&regs);
285	if (is_pci) {
286		regs.R_AH = pci_get_bus(dev);
287		regs.R_AL = (pci_get_slot(dev) << 3) |
288		    (pci_get_function(dev) & 0x07);
289	}
290	regs.R_DL = 0x80;
291	x86bios_call(&regs, X86BIOS_PHYSTOSEG(vesa_bios_offs + 3),
292	    X86BIOS_PHYSTOOFF(vesa_bios_offs + 3));
293
294	if (x86bios_get_intr(0x10) == 0)
295		return (1);
296
297	return (0);
298}
299
300/* VESA BIOS calls */
301static int
302vesa_bios_get_mode(int mode, struct vesa_mode *vmode, int flags)
303{
304	x86regs_t regs;
305	uint32_t offs;
306	void *buf;
307
308	buf = x86bios_alloc(&offs, sizeof(*vmode), flags);
309	if (buf == NULL)
310		return (1);
311
312	x86bios_init_regs(&regs);
313	regs.R_AX = 0x4f01;
314	regs.R_CX = mode;
315
316	regs.R_ES = X86BIOS_PHYSTOSEG(offs);
317	regs.R_DI = X86BIOS_PHYSTOOFF(offs);
318
319	x86bios_intr(&regs, 0x10);
320
321	if (regs.R_AX != 0x004f) {
322		x86bios_free(buf, sizeof(*vmode));
323		return (1);
324	}
325
326	bcopy(buf, vmode, sizeof(*vmode));
327	x86bios_free(buf, sizeof(*vmode));
328
329	return (0);
330}
331
332static int
333vesa_bios_set_mode(int mode)
334{
335	x86regs_t regs;
336
337	x86bios_init_regs(&regs);
338	regs.R_AX = 0x4f02;
339	regs.R_BX = mode;
340
341	x86bios_intr(&regs, 0x10);
342
343	return (regs.R_AX != 0x004f);
344}
345
346#if 0
347static int
348vesa_bios_get_dac(void)
349{
350	x86regs_t regs;
351
352	x86bios_init_regs(&regs);
353	regs.R_AX = 0x4f08;
354	regs.R_BL = 1;
355
356	x86bios_intr(&regs, 0x10);
357
358	if (regs.R_AX != 0x004f)
359		return (6);
360
361	return (regs.R_BH);
362}
363#endif
364
365static int
366vesa_bios_set_dac(int bits)
367{
368	x86regs_t regs;
369
370	x86bios_init_regs(&regs);
371	regs.R_AX = 0x4f08;
372	/* regs.R_BL = 0; */
373	regs.R_BH = bits;
374
375	x86bios_intr(&regs, 0x10);
376
377	if (regs.R_AX != 0x004f)
378		return (6);
379
380	return (regs.R_BH);
381}
382
383static int
384vesa_bios_save_palette(int start, int colors, u_char *palette, int bits)
385{
386	x86regs_t regs;
387	int i;
388
389	x86bios_init_regs(&regs);
390	regs.R_AX = 0x4f09;
391	regs.R_BL = 1;
392	regs.R_CX = colors;
393	regs.R_DX = start;
394
395	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_palette_offs);
396	regs.R_DI = X86BIOS_PHYSTOOFF(vesa_palette_offs);
397
398	bits = 8 - bits;
399	mtx_lock(&vesa_lock);
400	x86bios_intr(&regs, 0x10);
401	if (regs.R_AX != 0x004f) {
402		mtx_unlock(&vesa_lock);
403		return (1);
404	}
405	for (i = 0; i < colors; ++i) {
406		palette[i * 3] = vesa_palette[i * 4 + 2] << bits;
407		palette[i * 3 + 1] = vesa_palette[i * 4 + 1] << bits;
408		palette[i * 3 + 2] = vesa_palette[i * 4] << bits;
409	}
410	mtx_unlock(&vesa_lock);
411
412	return (0);
413}
414
415static int
416vesa_bios_save_palette2(int start, int colors, u_char *r, u_char *g, u_char *b,
417			int bits)
418{
419	x86regs_t regs;
420	int i;
421
422	x86bios_init_regs(&regs);
423	regs.R_AX = 0x4f09;
424	regs.R_BL = 1;
425	regs.R_CX = colors;
426	regs.R_DX = start;
427
428	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_palette_offs);
429	regs.R_DI = X86BIOS_PHYSTOOFF(vesa_palette_offs);
430
431	bits = 8 - bits;
432	mtx_lock(&vesa_lock);
433	x86bios_intr(&regs, 0x10);
434	if (regs.R_AX != 0x004f) {
435		mtx_unlock(&vesa_lock);
436		return (1);
437	}
438	for (i = 0; i < colors; ++i) {
439		r[i] = vesa_palette[i * 4 + 2] << bits;
440		g[i] = vesa_palette[i * 4 + 1] << bits;
441		b[i] = vesa_palette[i * 4] << bits;
442	}
443	mtx_unlock(&vesa_lock);
444
445	return (0);
446}
447
448static int
449vesa_bios_load_palette(int start, int colors, u_char *palette, int bits)
450{
451	x86regs_t regs;
452	int i;
453
454	x86bios_init_regs(&regs);
455	regs.R_AX = 0x4f09;
456	/* regs.R_BL = 0; */
457	regs.R_CX = colors;
458	regs.R_DX = start;
459
460	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_palette_offs);
461	regs.R_DI = X86BIOS_PHYSTOOFF(vesa_palette_offs);
462
463	bits = 8 - bits;
464	mtx_lock(&vesa_lock);
465	for (i = 0; i < colors; ++i) {
466		vesa_palette[i * 4] = palette[i * 3 + 2] >> bits;
467		vesa_palette[i * 4 + 1] = palette[i * 3 + 1] >> bits;
468		vesa_palette[i * 4 + 2] = palette[i * 3] >> bits;
469		vesa_palette[i * 4 + 3] = 0;
470	}
471	x86bios_intr(&regs, 0x10);
472	mtx_unlock(&vesa_lock);
473
474	return (regs.R_AX != 0x004f);
475}
476
477static int
478vesa_bios_load_palette2(int start, int colors, u_char *r, u_char *g, u_char *b,
479			int bits)
480{
481	x86regs_t regs;
482	int i;
483
484	x86bios_init_regs(&regs);
485	regs.R_AX = 0x4f09;
486	/* regs.R_BL = 0; */
487	regs.R_CX = colors;
488	regs.R_DX = start;
489
490	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_palette_offs);
491	regs.R_DI = X86BIOS_PHYSTOOFF(vesa_palette_offs);
492
493	bits = 8 - bits;
494	mtx_lock(&vesa_lock);
495	for (i = 0; i < colors; ++i) {
496		vesa_palette[i * 4] = b[i] >> bits;
497		vesa_palette[i * 4 + 1] = g[i] >> bits;
498		vesa_palette[i * 4 + 2] = r[i] >> bits;
499		vesa_palette[i * 4 + 3] = 0;
500	}
501	x86bios_intr(&regs, 0x10);
502	mtx_unlock(&vesa_lock);
503
504	return (regs.R_AX != 0x004f);
505}
506
507static size_t
508vesa_bios_state_buf_size(int state)
509{
510	x86regs_t regs;
511
512	x86bios_init_regs(&regs);
513	regs.R_AX = 0x4f04;
514	/* regs.R_DL = STATE_SIZE; */
515	regs.R_CX = state;
516
517	x86bios_intr(&regs, 0x10);
518
519	if (regs.R_AX != 0x004f)
520		return (0);
521
522	return (regs.R_BX * 64);
523}
524
525static int
526vesa_bios_save_restore(int code, void *p)
527{
528	x86regs_t regs;
529
530	if (code != STATE_SAVE && code != STATE_LOAD)
531		return (1);
532
533	x86bios_init_regs(&regs);
534	regs.R_AX = 0x4f04;
535	regs.R_DL = code;
536	regs.R_CX = vesa_state;
537
538	regs.R_ES = X86BIOS_PHYSTOSEG(vesa_state_buf_offs);
539	regs.R_BX = X86BIOS_PHYSTOOFF(vesa_state_buf_offs);
540
541	mtx_lock(&vesa_lock);
542	switch (code) {
543	case STATE_SAVE:
544		x86bios_intr(&regs, 0x10);
545		if (regs.R_AX == 0x004f)
546			bcopy(vesa_state_buf, p, vesa_state_buf_size);
547		break;
548	case STATE_LOAD:
549		bcopy(p, vesa_state_buf, vesa_state_buf_size);
550		x86bios_intr(&regs, 0x10);
551		break;
552	}
553	mtx_unlock(&vesa_lock);
554
555	return (regs.R_AX != 0x004f);
556}
557
558#ifdef MODE_TABLE_BROKEN
559static int
560vesa_bios_get_line_length(void)
561{
562	x86regs_t regs;
563
564	x86bios_init_regs(&regs);
565	regs.R_AX = 0x4f06;
566	regs.R_BL = 1;
567
568	x86bios_intr(&regs, 0x10);
569
570	if (regs.R_AX != 0x004f)
571		return (-1);
572
573	return (regs.R_BX);
574}
575#endif
576
577static int
578vesa_bios_set_line_length(int pixel, int *bytes, int *lines)
579{
580	x86regs_t regs;
581
582	x86bios_init_regs(&regs);
583	regs.R_AX = 0x4f06;
584	/* regs.R_BL = 0; */
585	regs.R_CX = pixel;
586
587	x86bios_intr(&regs, 0x10);
588
589#if VESA_DEBUG > 1
590	printf("bx:%d, cx:%d, dx:%d\n", regs.R_BX, regs.R_CX, regs.R_DX);
591#endif
592	if (regs.R_AX != 0x004f)
593		return (-1);
594
595	if (bytes != NULL)
596		*bytes = regs.R_BX;
597	if (lines != NULL)
598		*lines = regs.R_DX;
599
600	return (0);
601}
602
603#if 0
604static int
605vesa_bios_get_start(int *x, int *y)
606{
607	x86regs_t regs;
608
609	x86bios_init_regs(&regs);
610	regs.R_AX = 0x4f07;
611	regs.R_BL = 1;
612
613	x86bios_intr(&regs, 0x10);
614
615	if (regs.R_AX != 0x004f)
616		return (-1);
617
618	*x = regs.R_CX;
619	*y = regs.R_DX;
620
621	return (0);
622}
623#endif
624
625static int
626vesa_bios_set_start(int x, int y)
627{
628	x86regs_t regs;
629
630	x86bios_init_regs(&regs);
631	regs.R_AX = 0x4f07;
632	regs.R_BL = 0x80;
633	regs.R_CX = x;
634	regs.R_DX = y;
635
636	x86bios_intr(&regs, 0x10);
637
638	return (regs.R_AX != 0x004f);
639}
640
641/* map a generic video mode to a known mode */
642static int
643vesa_map_gen_mode_num(int type, int color, int mode)
644{
645    static struct {
646	int from;
647	int to;
648    } mode_map[] = {
649	{ M_TEXT_132x25, M_VESA_C132x25 },
650	{ M_TEXT_132x43, M_VESA_C132x43 },
651	{ M_TEXT_132x50, M_VESA_C132x50 },
652	{ M_TEXT_132x60, M_VESA_C132x60 },
653    };
654    int i;
655
656    for (i = 0; i < nitems(mode_map); ++i) {
657        if (mode_map[i].from == mode)
658            return (mode_map[i].to);
659    }
660    return (mode);
661}
662
663static int
664vesa_translate_flags(u_int16_t vflags)
665{
666	static struct {
667		u_int16_t mask;
668		int set;
669		int reset;
670	} ftable[] = {
671		{ V_MODECOLOR, V_INFO_COLOR, 0 },
672		{ V_MODEGRAPHICS, V_INFO_GRAPHICS, 0 },
673		{ V_MODELFB, V_INFO_LINEAR, 0 },
674		{ V_MODENONVGA, V_INFO_NONVGA, 0 },
675	};
676	int flags;
677	int i;
678
679	for (flags = 0, i = 0; i < nitems(ftable); ++i) {
680		flags |= (vflags & ftable[i].mask) ?
681			 ftable[i].set : ftable[i].reset;
682	}
683	return (flags);
684}
685
686static int
687vesa_translate_mmodel(u_int8_t vmodel)
688{
689	static struct {
690		u_int8_t vmodel;
691		int mmodel;
692	} mtable[] = {
693		{ V_MMTEXT,	V_INFO_MM_TEXT },
694		{ V_MMCGA,	V_INFO_MM_CGA },
695		{ V_MMHGC,	V_INFO_MM_HGC },
696		{ V_MMEGA,	V_INFO_MM_PLANAR },
697		{ V_MMPACKED,	V_INFO_MM_PACKED },
698		{ V_MMDIRCOLOR,	V_INFO_MM_DIRECT },
699	};
700	int i;
701
702	for (i = 0; mtable[i].mmodel >= 0; ++i) {
703		if (mtable[i].vmodel == vmodel)
704			return (mtable[i].mmodel);
705	}
706	return (V_INFO_MM_OTHER);
707}
708
709static int
710vesa_get_bpscanline(struct vesa_mode *vmode)
711{
712	int bpsl;
713
714	if ((vmode->v_modeattr & V_MODEGRAPHICS) != 0) {
715		/* Find the minimum length. */
716		switch (vmode->v_bpp / vmode->v_planes) {
717		case 1:
718			bpsl = vmode->v_width / 8;
719			break;
720		case 2:
721			bpsl = vmode->v_width / 4;
722			break;
723		case 4:
724			bpsl = vmode->v_width / 2;
725			break;
726		default:
727			bpsl = vmode->v_width * ((vmode->v_bpp + 7) / 8);
728			bpsl /= vmode->v_planes;
729			break;
730		}
731
732		/* Use VBE 3.0 information if it looks sane. */
733		if ((vmode->v_modeattr & V_MODELFB) != 0 &&
734		    vesa_adp_info->v_version >= 0x0300 &&
735		    vmode->v_linbpscanline > bpsl)
736			return (vmode->v_linbpscanline);
737
738		/* Return the minimum if the mode table looks absurd. */
739		if (vmode->v_bpscanline < bpsl)
740			return (bpsl);
741	}
742
743	return (vmode->v_bpscanline);
744}
745
746#define	VESA_MAXSTR		256
747
748#define	VESA_STRCPY(dst, src)	do {				\
749	char *str;						\
750	int i;							\
751	dst = malloc(VESA_MAXSTR, M_DEVBUF, M_WAITOK);		\
752	str = x86bios_offset(BIOS_SADDRTOLADDR(src));		\
753	for (i = 0; i < VESA_MAXSTR - 1 && str[i] != '\0'; i++)	\
754		dst[i] = str[i];				\
755	dst[i] = '\0';						\
756} while (0)
757
758static int
759vesa_bios_init(void)
760{
761	struct vesa_mode vmode;
762	struct vesa_info *buf;
763	video_info_t *p;
764	x86regs_t regs;
765	size_t bsize;
766	size_t msize;
767	void *vmbuf;
768	uint8_t *vbios;
769	uint32_t offs;
770	uint16_t vers;
771	int is_via_cle266;
772	int modes;
773	int i;
774
775	if (vesa_init_done)
776		return (0);
777
778	vesa_bios_offs = VESA_BIOS_OFFSET;
779
780	/*
781	 * If the VBE real mode interrupt vector is not found, try BIOS POST.
782	 */
783	vesa_bios_int10 = x86bios_get_intr(0x10);
784	if (vesa_bios_int10 == 0) {
785		if (vesa_bios_post() != 0)
786			return (1);
787		vesa_bios_int10 = x86bios_get_intr(0x10);
788		if (vesa_bios_int10 == 0)
789			return (1);
790	}
791
792	/*
793	 * Shadow video ROM.
794	 */
795	offs = vesa_bios_int10;
796	if (vesa_shadow_rom) {
797		vbios = x86bios_get_orm(vesa_bios_offs);
798		if (vbios != NULL) {
799			vesa_bios_size = vbios[2] * 512;
800			if (((VESA_BIOS_OFFSET << 12) & 0xffff0000) ==
801			    (vesa_bios_int10 & 0xffff0000) &&
802			    vesa_bios_size > (vesa_bios_int10 & 0xffff)) {
803				vesa_bios = x86bios_alloc(&vesa_bios_offs,
804				    vesa_bios_size, M_WAITOK);
805				bcopy(vbios, vesa_bios, vesa_bios_size);
806				offs = ((vesa_bios_offs << 12) & 0xffff0000) +
807				    (vesa_bios_int10 & 0xffff);
808				x86bios_set_intr(0x10, offs);
809			}
810		}
811		if (vesa_bios == NULL)
812			printf("VESA: failed to shadow video ROM\n");
813	}
814	if (bootverbose)
815		printf("VESA: INT 0x10 vector 0x%04x:0x%04x\n",
816		    (offs >> 16) & 0xffff, offs & 0xffff);
817
818	x86bios_init_regs(&regs);
819	regs.R_AX = 0x4f00;
820
821	vmbuf = x86bios_alloc(&offs, sizeof(*buf), M_WAITOK);
822
823	regs.R_ES = X86BIOS_PHYSTOSEG(offs);
824	regs.R_DI = X86BIOS_PHYSTOOFF(offs);
825
826	bcopy("VBE2", vmbuf, 4);	/* try for VBE2 data */
827	x86bios_intr(&regs, 0x10);
828
829	if (regs.R_AX != 0x004f || bcmp("VESA", vmbuf, 4) != 0)
830		goto fail;
831
832	vesa_adp_info = buf = malloc(sizeof(*buf), M_DEVBUF, M_WAITOK);
833	bcopy(vmbuf, buf, sizeof(*buf));
834
835	if (bootverbose) {
836		printf("VESA: information block\n");
837		hexdump(buf, sizeof(*buf), NULL, HD_OMIT_CHARS);
838	}
839
840	vers = buf->v_version = le16toh(buf->v_version);
841	buf->v_oemstr = le32toh(buf->v_oemstr);
842	buf->v_flags = le32toh(buf->v_flags);
843	buf->v_modetable = le32toh(buf->v_modetable);
844	buf->v_memsize = le16toh(buf->v_memsize);
845	buf->v_revision = le16toh(buf->v_revision);
846	buf->v_venderstr = le32toh(buf->v_venderstr);
847	buf->v_prodstr = le32toh(buf->v_prodstr);
848	buf->v_revstr = le32toh(buf->v_revstr);
849
850	if (vers < 0x0102) {
851		printf("VESA: VBE version %d.%d is not supported; "
852		    "version 1.2 or later is required.\n",
853		    ((vers & 0xf000) >> 12) * 10 + ((vers & 0x0f00) >> 8),
854		    ((vers & 0x00f0) >> 4) * 10 + (vers & 0x000f));
855		goto fail;
856	}
857
858	VESA_STRCPY(vesa_oemstr, buf->v_oemstr);
859	if (vers >= 0x0200) {
860		VESA_STRCPY(vesa_venderstr, buf->v_venderstr);
861		VESA_STRCPY(vesa_prodstr, buf->v_prodstr);
862		VESA_STRCPY(vesa_revstr, buf->v_revstr);
863	}
864	is_via_cle266 = strncmp(vesa_oemstr, VESA_VIA_CLE266,
865	    sizeof(VESA_VIA_CLE266)) == 0;
866
867	if (buf->v_modetable == 0)
868		goto fail;
869
870	msize = (size_t)buf->v_memsize * 64 * 1024;
871
872	vesa_vmodetab = x86bios_offset(BIOS_SADDRTOLADDR(buf->v_modetable));
873
874	for (i = 0, modes = 0; (i < (M_VESA_MODE_MAX - M_VESA_BASE + 1)) &&
875	    (vesa_vmodetab[i] != 0xffff); ++i) {
876		vesa_vmodetab[i] = le16toh(vesa_vmodetab[i]);
877		if (vesa_bios_get_mode(vesa_vmodetab[i], &vmode, M_WAITOK))
878			continue;
879
880		vmode.v_modeattr = le16toh(vmode.v_modeattr);
881		vmode.v_wgran = le16toh(vmode.v_wgran);
882		vmode.v_wsize = le16toh(vmode.v_wsize);
883		vmode.v_waseg = le16toh(vmode.v_waseg);
884		vmode.v_wbseg = le16toh(vmode.v_wbseg);
885		vmode.v_posfunc = le32toh(vmode.v_posfunc);
886		vmode.v_bpscanline = le16toh(vmode.v_bpscanline);
887		vmode.v_width = le16toh(vmode.v_width);
888		vmode.v_height = le16toh(vmode.v_height);
889		vmode.v_lfb = le32toh(vmode.v_lfb);
890		vmode.v_offscreen = le32toh(vmode.v_offscreen);
891		vmode.v_offscreensize = le16toh(vmode.v_offscreensize);
892		vmode.v_linbpscanline = le16toh(vmode.v_linbpscanline);
893		vmode.v_maxpixelclock = le32toh(vmode.v_maxpixelclock);
894
895		/* reject unsupported modes */
896#if 0
897		if ((vmode.v_modeattr &
898		    (V_MODESUPP | V_MODEOPTINFO | V_MODENONVGA)) !=
899		    (V_MODESUPP | V_MODEOPTINFO))
900			continue;
901#else
902		if ((vmode.v_modeattr & V_MODEOPTINFO) == 0) {
903#if VESA_DEBUG > 1
904			printf("Rejecting VESA %s mode: %d x %d x %d bpp "
905			    " attr = %x\n",
906			    vmode.v_modeattr & V_MODEGRAPHICS ?
907			    "graphics" : "text",
908			    vmode.v_width, vmode.v_height, vmode.v_bpp,
909			    vmode.v_modeattr);
910#endif
911			continue;
912		}
913#endif
914
915		bsize = vesa_get_bpscanline(&vmode) * vmode.v_height;
916		if ((vmode.v_modeattr & V_MODEGRAPHICS) != 0)
917			bsize *= vmode.v_planes;
918
919		/* Does it have enough memory to support this mode? */
920		if (msize < bsize) {
921#if VESA_DEBUG > 1
922			printf("Rejecting VESA %s mode: %d x %d x %d bpp "
923			    " attr = %x, not enough memory\n",
924			    vmode.v_modeattr & V_MODEGRAPHICS ?
925			    "graphics" : "text",
926			    vmode.v_width, vmode.v_height, vmode.v_bpp,
927			    vmode.v_modeattr);
928#endif
929			continue;
930		}
931		if (bsize > vesa_vmem_max)
932			vesa_vmem_max = bsize;
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	if (modes == 0)
1034		goto fail;
1035
1036	x86bios_free(vmbuf, sizeof(*buf));
1037
1038	/* Probe supported save/restore states. */
1039	for (i = 0; i < 4; i++)
1040		if (vesa_bios_state_buf_size(1 << i) > 0)
1041			vesa_state |= 1 << i;
1042	if (vesa_state != 0)
1043		vesa_state_buf_size = vesa_bios_state_buf_size(vesa_state);
1044	vesa_palette = x86bios_alloc(&vesa_palette_offs,
1045	    VESA_PALETTE_SIZE + vesa_state_buf_size, M_WAITOK);
1046	if (vesa_state_buf_size > 0) {
1047		vesa_state_buf = vesa_palette + VESA_PALETTE_SIZE;
1048		vesa_state_buf_offs = vesa_palette_offs + VESA_PALETTE_SIZE;
1049	}
1050
1051	return (0);
1052
1053fail:
1054	x86bios_free(vmbuf, sizeof(buf));
1055	vesa_bios_uninit();
1056	return (1);
1057}
1058
1059static void
1060vesa_bios_uninit(void)
1061{
1062
1063	if (vesa_bios != NULL) {
1064		x86bios_set_intr(0x10, vesa_bios_int10);
1065		vesa_bios_offs = VESA_BIOS_OFFSET;
1066		x86bios_free(vesa_bios, vesa_bios_size);
1067		vesa_bios = NULL;
1068	}
1069	if (vesa_adp_info != NULL) {
1070		free(vesa_adp_info, M_DEVBUF);
1071		vesa_adp_info = NULL;
1072	}
1073	if (vesa_oemstr != NULL) {
1074		free(vesa_oemstr, M_DEVBUF);
1075		vesa_oemstr = NULL;
1076	}
1077	if (vesa_venderstr != NULL) {
1078		free(vesa_venderstr, M_DEVBUF);
1079		vesa_venderstr = NULL;
1080	}
1081	if (vesa_prodstr != NULL) {
1082		free(vesa_prodstr, M_DEVBUF);
1083		vesa_prodstr = NULL;
1084	}
1085	if (vesa_revstr != NULL) {
1086		free(vesa_revstr, M_DEVBUF);
1087		vesa_revstr = NULL;
1088	}
1089	if (vesa_vmode != NULL) {
1090		free(vesa_vmode, M_DEVBUF);
1091		vesa_vmode = NULL;
1092	}
1093	if (vesa_palette != NULL) {
1094		x86bios_free(vesa_palette,
1095		    VESA_PALETTE_SIZE + vesa_state_buf_size);
1096		vesa_palette = NULL;
1097	}
1098}
1099
1100static void
1101vesa_clear_modes(video_info_t *info, int color)
1102{
1103	while (info->vi_mode != EOT) {
1104		if ((info->vi_flags & V_INFO_COLOR) != color)
1105			info->vi_mode = NA;
1106		++info;
1107	}
1108}
1109
1110/* entry points */
1111
1112static int
1113vesa_configure(int flags)
1114{
1115	video_adapter_t *adp;
1116	int adapters;
1117	int error;
1118	int i;
1119
1120	if (vesa_init_done)
1121		return (0);
1122	if (flags & VIO_PROBE_ONLY)
1123		return (0);
1124
1125	/*
1126	 * If the VESA module has already been loaded, abort loading
1127	 * the module this time.
1128	 */
1129	for (i = 0; (adp = vid_get_adapter(i)) != NULL; ++i) {
1130		if (adp->va_flags & V_ADP_VESA)
1131			return (ENXIO);
1132		if (adp->va_type == KD_VGA)
1133			break;
1134	}
1135
1136	/*
1137	 * The VGA adapter is not found.  This is because either
1138	 * 1) the VGA driver has not been initialized, or 2) the VGA card
1139	 * is not present.  If 1) is the case, we shall defer
1140	 * initialization for now and try again later.
1141	 */
1142	if (adp == NULL) {
1143		vga_sub_configure = vesa_configure;
1144		return (ENODEV);
1145	}
1146
1147	/* count number of registered adapters */
1148	for (++i; vid_get_adapter(i) != NULL; ++i)
1149		;
1150	adapters = i;
1151
1152	/* call VESA BIOS */
1153	vesa_adp = adp;
1154	if (vesa_bios_init()) {
1155		vesa_adp = NULL;
1156		return (ENXIO);
1157	}
1158	vesa_adp->va_flags |= V_ADP_VESA;
1159
1160	/* remove conflicting modes if we have more than one adapter */
1161	if (adapters > 1) {
1162		vesa_clear_modes(vesa_vmode,
1163				 (vesa_adp->va_flags & V_ADP_COLOR) ?
1164				     V_INFO_COLOR : 0);
1165	}
1166
1167	if ((error = vesa_load_ioctl()) == 0) {
1168		prevvidsw = vidsw[vesa_adp->va_index];
1169		vidsw[vesa_adp->va_index] = &vesavidsw;
1170		vesa_init_done = TRUE;
1171	} else {
1172		vesa_adp = NULL;
1173		return (error);
1174	}
1175
1176	return (0);
1177}
1178
1179#if 0
1180static int
1181vesa_nop(void)
1182{
1183
1184	return (0);
1185}
1186#endif
1187
1188static int
1189vesa_error(void)
1190{
1191
1192	return (1);
1193}
1194
1195static int
1196vesa_probe(int unit, video_adapter_t **adpp, void *arg, int flags)
1197{
1198
1199	return ((*prevvidsw->probe)(unit, adpp, arg, flags));
1200}
1201
1202static int
1203vesa_init(int unit, video_adapter_t *adp, int flags)
1204{
1205
1206	return ((*prevvidsw->init)(unit, adp, flags));
1207}
1208
1209static int
1210vesa_get_info(video_adapter_t *adp, int mode, video_info_t *info)
1211{
1212	int i;
1213
1214	if ((*prevvidsw->get_info)(adp, mode, info) == 0)
1215		return (0);
1216
1217	if (adp != vesa_adp)
1218		return (1);
1219
1220	mode = vesa_map_gen_mode_num(vesa_adp->va_type,
1221				     vesa_adp->va_flags & V_ADP_COLOR, mode);
1222	for (i = 0; vesa_vmode[i].vi_mode != EOT; ++i) {
1223		if (vesa_vmode[i].vi_mode == NA)
1224			continue;
1225		if (vesa_vmode[i].vi_mode == mode) {
1226			*info = vesa_vmode[i];
1227			return (0);
1228		}
1229	}
1230	return (1);
1231}
1232
1233static int
1234vesa_query_mode(video_adapter_t *adp, video_info_t *info)
1235{
1236	int i;
1237
1238	if ((*prevvidsw->query_mode)(adp, info) == 0)
1239		return (0);
1240	if (adp != vesa_adp)
1241		return (ENODEV);
1242
1243	for (i = 0; vesa_vmode[i].vi_mode != EOT; ++i) {
1244		if ((info->vi_width != 0)
1245		    && (info->vi_width != vesa_vmode[i].vi_width))
1246			continue;
1247		if ((info->vi_height != 0)
1248		    && (info->vi_height != vesa_vmode[i].vi_height))
1249			continue;
1250		if ((info->vi_cwidth != 0)
1251		    && (info->vi_cwidth != vesa_vmode[i].vi_cwidth))
1252			continue;
1253		if ((info->vi_cheight != 0)
1254		    && (info->vi_cheight != vesa_vmode[i].vi_cheight))
1255			continue;
1256		if ((info->vi_depth != 0)
1257		    && (info->vi_depth != vesa_vmode[i].vi_depth))
1258			continue;
1259		if ((info->vi_planes != 0)
1260		    && (info->vi_planes != vesa_vmode[i].vi_planes))
1261			continue;
1262		/* pixel format, memory model */
1263		if ((info->vi_flags != 0)
1264		    && (info->vi_flags != vesa_vmode[i].vi_flags))
1265			continue;
1266		*info = vesa_vmode[i];
1267		return (0);
1268	}
1269	return (ENODEV);
1270}
1271
1272static int
1273vesa_set_mode(video_adapter_t *adp, int mode)
1274{
1275	video_info_t info;
1276
1277	if (adp != vesa_adp)
1278		return ((*prevvidsw->set_mode)(adp, mode));
1279
1280	mode = vesa_map_gen_mode_num(adp->va_type,
1281				     adp->va_flags & V_ADP_COLOR, mode);
1282#if VESA_DEBUG > 0
1283	printf("VESA: set_mode(): %d(%x) -> %d(%x)\n",
1284		adp->va_mode, adp->va_mode, mode, mode);
1285#endif
1286	/*
1287	 * If the current mode is a VESA mode and the new mode is not,
1288	 * restore the state of the adapter first by setting one of the
1289	 * standard VGA mode, so that non-standard, extended SVGA registers
1290	 * are set to the state compatible with the standard VGA modes.
1291	 * Otherwise (*prevvidsw->set_mode)() may not be able to set up
1292	 * the new mode correctly.
1293	 */
1294	if (VESA_MODE(adp->va_mode)) {
1295		if (!VESA_MODE(mode) &&
1296		    (*prevvidsw->get_info)(adp, mode, &info) == 0) {
1297			if ((adp->va_flags & V_ADP_DAC8) != 0) {
1298				vesa_bios_set_dac(6);
1299				adp->va_flags &= ~V_ADP_DAC8;
1300			}
1301			int10_set_mode(adp->va_initial_bios_mode);
1302			if (adp->va_info.vi_flags & V_INFO_LINEAR)
1303				pmap_unmapdev(adp->va_buffer, vesa_vmem_max);
1304			/*
1305			 * Once (*prevvidsw->get_info)() succeeded,
1306			 * (*prevvidsw->set_mode)() below won't fail...
1307			 */
1308		}
1309	}
1310
1311	/* we may not need to handle this mode after all... */
1312	if (!VESA_MODE(mode) && (*prevvidsw->set_mode)(adp, mode) == 0)
1313		return (0);
1314
1315	/* is the new mode supported? */
1316	if (vesa_get_info(adp, mode, &info))
1317		return (1);
1318	/* assert(VESA_MODE(mode)); */
1319
1320#if VESA_DEBUG > 0
1321	printf("VESA: about to set a VESA mode...\n");
1322#endif
1323	/* don't use the linear frame buffer for text modes. XXX */
1324	if (!(info.vi_flags & V_INFO_GRAPHICS))
1325		info.vi_flags &= ~V_INFO_LINEAR;
1326
1327	if ((info.vi_flags & V_INFO_LINEAR) != 0)
1328		mode |= 0x4000;
1329	if (vesa_bios_set_mode(mode | 0x8000))
1330		return (1);
1331
1332	/* Palette format is reset by the above VBE function call. */
1333	adp->va_flags &= ~V_ADP_DAC8;
1334
1335	if ((vesa_adp_info->v_flags & V_DAC8) != 0 &&
1336	    (info.vi_flags & V_INFO_GRAPHICS) != 0 &&
1337	    vesa_bios_set_dac(8) > 6)
1338		adp->va_flags |= V_ADP_DAC8;
1339
1340	if (adp->va_info.vi_flags & V_INFO_LINEAR)
1341		pmap_unmapdev(adp->va_buffer, vesa_vmem_max);
1342
1343#if VESA_DEBUG > 0
1344	printf("VESA: mode set!\n");
1345#endif
1346	vesa_adp->va_mode = mode & 0x1ff;	/* Mode number is 9-bit. */
1347	vesa_adp->va_flags &= ~V_ADP_COLOR;
1348	vesa_adp->va_flags |=
1349		(info.vi_flags & V_INFO_COLOR) ? V_ADP_COLOR : 0;
1350	vesa_adp->va_crtc_addr =
1351		(vesa_adp->va_flags & V_ADP_COLOR) ? COLOR_CRTC : MONO_CRTC;
1352
1353	vesa_adp->va_line_width = info.vi_buffer_size / info.vi_height;
1354	if ((info.vi_flags & V_INFO_GRAPHICS) != 0)
1355		vesa_adp->va_line_width /= info.vi_planes;
1356
1357#ifdef MODE_TABLE_BROKEN
1358	/* If VBE function returns bigger bytes per scan line, use it. */
1359	{
1360		int bpsl = vesa_bios_get_line_length();
1361		if (bpsl > vesa_adp->va_line_width) {
1362			vesa_adp->va_line_width = bpsl;
1363			info.vi_buffer_size = bpsl * info.vi_height;
1364			if ((info.vi_flags & V_INFO_GRAPHICS) != 0)
1365				info.vi_buffer_size *= info.vi_planes;
1366		}
1367	}
1368#endif
1369
1370	if (info.vi_flags & V_INFO_LINEAR) {
1371#if VESA_DEBUG > 1
1372		printf("VESA: setting up LFB\n");
1373#endif
1374		vesa_adp->va_buffer =
1375		    (vm_offset_t)pmap_mapdev_attr(info.vi_buffer,
1376		    vesa_vmem_max, PAT_WRITE_COMBINING);
1377		vesa_adp->va_window = vesa_adp->va_buffer;
1378		vesa_adp->va_window_size = info.vi_buffer_size / info.vi_planes;
1379		vesa_adp->va_window_gran = info.vi_buffer_size / info.vi_planes;
1380	} else {
1381		vesa_adp->va_buffer = 0;
1382		vesa_adp->va_window = (vm_offset_t)x86bios_offset(info.vi_window);
1383		vesa_adp->va_window_size = info.vi_window_size;
1384		vesa_adp->va_window_gran = info.vi_window_gran;
1385	}
1386	vesa_adp->va_buffer_size = info.vi_buffer_size;
1387	vesa_adp->va_window_orig = 0;
1388	vesa_adp->va_disp_start.x = 0;
1389	vesa_adp->va_disp_start.y = 0;
1390#if VESA_DEBUG > 0
1391	printf("vesa_set_mode(): vi_width:%d, line_width:%d\n",
1392	       info.vi_width, vesa_adp->va_line_width);
1393#endif
1394	bcopy(&info, &vesa_adp->va_info, sizeof(vesa_adp->va_info));
1395
1396	/* move hardware cursor out of the way */
1397	(*vidsw[vesa_adp->va_index]->set_hw_cursor)(vesa_adp, -1, -1);
1398
1399	return (0);
1400}
1401
1402static int
1403vesa_save_font(video_adapter_t *adp, int page, int fontsize, int fontwidth,
1404	       u_char *data, int ch, int count)
1405{
1406
1407	return ((*prevvidsw->save_font)(adp, page, fontsize, fontwidth, data,
1408	    ch, count));
1409}
1410
1411static int
1412vesa_load_font(video_adapter_t *adp, int page, int fontsize, int fontwidth,
1413	       u_char *data, int ch, int count)
1414{
1415
1416	return ((*prevvidsw->load_font)(adp, page, fontsize, fontwidth, data,
1417		ch, count));
1418}
1419
1420static int
1421vesa_show_font(video_adapter_t *adp, int page)
1422{
1423
1424	return ((*prevvidsw->show_font)(adp, page));
1425}
1426
1427static int
1428vesa_save_palette(video_adapter_t *adp, u_char *palette)
1429{
1430	int bits;
1431
1432	if (adp == vesa_adp && VESA_MODE(adp->va_mode)) {
1433		bits = (adp->va_flags & V_ADP_DAC8) != 0 ? 8 : 6;
1434		if (vesa_bios_save_palette(0, 256, palette, bits) == 0)
1435			return (0);
1436	}
1437
1438	return ((*prevvidsw->save_palette)(adp, palette));
1439}
1440
1441static int
1442vesa_load_palette(video_adapter_t *adp, u_char *palette)
1443{
1444	int bits;
1445
1446	if (adp == vesa_adp && VESA_MODE(adp->va_mode)) {
1447		bits = (adp->va_flags & V_ADP_DAC8) != 0 ? 8 : 6;
1448		if (vesa_bios_load_palette(0, 256, palette, bits) == 0)
1449			return (0);
1450	}
1451
1452	return ((*prevvidsw->load_palette)(adp, palette));
1453}
1454
1455static int
1456vesa_set_border(video_adapter_t *adp, int color)
1457{
1458
1459	return ((*prevvidsw->set_border)(adp, color));
1460}
1461
1462static int
1463vesa_save_state(video_adapter_t *adp, void *p, size_t size)
1464{
1465	void *buf;
1466	size_t bsize;
1467
1468	if (adp != vesa_adp || (size == 0 && vesa_state_buf_size == 0))
1469		return ((*prevvidsw->save_state)(adp, p, size));
1470
1471	bsize = offsetof(adp_state_t, regs) + vesa_state_buf_size;
1472	if (size == 0)
1473		return (bsize);
1474	if (vesa_state_buf_size > 0 && size < bsize)
1475		return (EINVAL);
1476
1477	if (vesa_vmem_buf != NULL) {
1478		free(vesa_vmem_buf, M_DEVBUF);
1479		vesa_vmem_buf = NULL;
1480	}
1481	if (VESA_MODE(adp->va_mode)) {
1482		buf = (void *)adp->va_buffer;
1483		if (buf != NULL) {
1484			bsize = adp->va_buffer_size;
1485			vesa_vmem_buf = malloc(bsize, M_DEVBUF, M_NOWAIT);
1486			if (vesa_vmem_buf != NULL)
1487				bcopy(buf, vesa_vmem_buf, bsize);
1488		}
1489	}
1490	if (vesa_state_buf_size == 0)
1491		return ((*prevvidsw->save_state)(adp, p, size));
1492	((adp_state_t *)p)->sig = V_STATE_SIG;
1493	return (vesa_bios_save_restore(STATE_SAVE, ((adp_state_t *)p)->regs));
1494}
1495
1496static int
1497vesa_load_state(video_adapter_t *adp, void *p)
1498{
1499	void *buf;
1500	size_t bsize;
1501	int error, mode;
1502
1503	if (adp != vesa_adp)
1504		return ((*prevvidsw->load_state)(adp, p));
1505
1506	/* Try BIOS POST to restore a sane state. */
1507	(void)vesa_bios_post();
1508	bsize = adp->va_buffer_size;
1509	mode = adp->va_mode;
1510	error = vesa_set_mode(adp, adp->va_initial_mode);
1511	if (mode != adp->va_initial_mode)
1512		error = vesa_set_mode(adp, mode);
1513
1514	if (vesa_vmem_buf != NULL) {
1515		if (error == 0 && VESA_MODE(mode)) {
1516			buf = (void *)adp->va_buffer;
1517			if (buf != NULL)
1518				bcopy(vesa_vmem_buf, buf, bsize);
1519		}
1520		free(vesa_vmem_buf, M_DEVBUF);
1521		vesa_vmem_buf = NULL;
1522	}
1523	if (((adp_state_t *)p)->sig != V_STATE_SIG)
1524		return ((*prevvidsw->load_state)(adp, p));
1525	return (vesa_bios_save_restore(STATE_LOAD, ((adp_state_t *)p)->regs));
1526}
1527
1528#if 0
1529static int
1530vesa_get_origin(video_adapter_t *adp, off_t *offset)
1531{
1532	x86regs_t regs;
1533
1534	x86bios_init_regs(&regs);
1535	regs.R_AX = 0x4f05;
1536	regs.R_BL = 0x10;
1537
1538	x86bios_intr(&regs, 0x10);
1539
1540	if (regs.R_AX != 0x004f)
1541		return (1);
1542	*offset = regs.DX * adp->va_window_gran;
1543
1544	return (0);
1545}
1546#endif
1547
1548static int
1549vesa_set_origin(video_adapter_t *adp, off_t offset)
1550{
1551	x86regs_t regs;
1552
1553	/*
1554	 * This function should return as quickly as possible to
1555	 * maintain good performance of the system. For this reason,
1556	 * error checking is kept minimal and let the VESA BIOS to
1557	 * detect error.
1558	 */
1559	if (adp != vesa_adp)
1560		return ((*prevvidsw->set_win_org)(adp, offset));
1561
1562	/* if this is a linear frame buffer, do nothing */
1563	if (adp->va_info.vi_flags & V_INFO_LINEAR)
1564		return (0);
1565	/* XXX */
1566	if (adp->va_window_gran == 0)
1567		return (1);
1568
1569	x86bios_init_regs(&regs);
1570	regs.R_AX = 0x4f05;
1571	regs.R_DX = offset / adp->va_window_gran;
1572
1573	x86bios_intr(&regs, 0x10);
1574
1575	if (regs.R_AX != 0x004f)
1576		return (1);
1577
1578	x86bios_init_regs(&regs);
1579	regs.R_AX = 0x4f05;
1580	regs.R_BL = 1;
1581	regs.R_DX = offset / adp->va_window_gran;
1582	x86bios_intr(&regs, 0x10);
1583
1584	adp->va_window_orig = rounddown(offset, adp->va_window_gran);
1585	return (0);			/* XXX */
1586}
1587
1588static int
1589vesa_read_hw_cursor(video_adapter_t *adp, int *col, int *row)
1590{
1591
1592	return ((*prevvidsw->read_hw_cursor)(adp, col, row));
1593}
1594
1595static int
1596vesa_set_hw_cursor(video_adapter_t *adp, int col, int row)
1597{
1598
1599	return ((*prevvidsw->set_hw_cursor)(adp, col, row));
1600}
1601
1602static int
1603vesa_set_hw_cursor_shape(video_adapter_t *adp, int base, int height,
1604			 int celsize, int blink)
1605{
1606
1607	return ((*prevvidsw->set_hw_cursor_shape)(adp, base, height, celsize,
1608	    blink));
1609}
1610
1611static int
1612vesa_blank_display(video_adapter_t *adp, int mode)
1613{
1614
1615	/* XXX: use VESA DPMS */
1616	return ((*prevvidsw->blank_display)(adp, mode));
1617}
1618
1619static int
1620vesa_mmap(video_adapter_t *adp, vm_ooffset_t offset, vm_paddr_t *paddr,
1621	  int prot, vm_memattr_t *memattr)
1622{
1623
1624#if VESA_DEBUG > 0
1625	printf("vesa_mmap(): window:0x%tx, buffer:0x%tx, offset:0x%jx\n",
1626	       adp->va_info.vi_window, adp->va_info.vi_buffer, offset);
1627#endif
1628
1629	if ((adp == vesa_adp) &&
1630	    (adp->va_info.vi_flags & V_INFO_LINEAR) != 0) {
1631		/* va_window_size == va_buffer_size/vi_planes */
1632		/* XXX: is this correct? */
1633		if (offset > adp->va_window_size - PAGE_SIZE)
1634			return (-1);
1635		*paddr = adp->va_info.vi_buffer + offset;
1636		return (0);
1637	}
1638	return ((*prevvidsw->mmap)(adp, offset, paddr, prot, memattr));
1639}
1640
1641static int
1642vesa_clear(video_adapter_t *adp)
1643{
1644
1645	return ((*prevvidsw->clear)(adp));
1646}
1647
1648static int
1649vesa_fill_rect(video_adapter_t *adp, int val, int x, int y, int cx, int cy)
1650{
1651
1652	return ((*prevvidsw->fill_rect)(adp, val, x, y, cx, cy));
1653}
1654
1655static int
1656vesa_bitblt(video_adapter_t *adp,...)
1657{
1658
1659	/* FIXME */
1660	return (1);
1661}
1662
1663static int
1664get_palette(video_adapter_t *adp, int base, int count,
1665	    u_char *red, u_char *green, u_char *blue, u_char *trans)
1666{
1667	u_char *r;
1668	u_char *g;
1669	u_char *b;
1670	int bits;
1671	int error;
1672
1673	if (base < 0 || base >= 256 || count < 0 || count > 256)
1674		return (1);
1675	if ((base + count) > 256)
1676		return (1);
1677	if (!VESA_MODE(adp->va_mode))
1678		return (1);
1679
1680	bits = (adp->va_flags & V_ADP_DAC8) != 0 ? 8 : 6;
1681	r = malloc(count * 3, M_DEVBUF, M_WAITOK);
1682	g = r + count;
1683	b = g + count;
1684	error = vesa_bios_save_palette2(base, count, r, g, b, bits);
1685	if (error == 0) {
1686		copyout(r, red, count);
1687		copyout(g, green, count);
1688		copyout(b, blue, count);
1689		if (trans != NULL) {
1690			bzero(r, count);
1691			copyout(r, trans, count);
1692		}
1693	}
1694	free(r, M_DEVBUF);
1695
1696	return (error);
1697}
1698
1699static int
1700set_palette(video_adapter_t *adp, int base, int count,
1701	    u_char *red, u_char *green, u_char *blue, u_char *trans)
1702{
1703	u_char *r;
1704	u_char *g;
1705	u_char *b;
1706	int bits;
1707	int error;
1708
1709	if (base < 0 || base >= 256 || count < 0 || count > 256)
1710		return (1);
1711	if ((base + count) > 256)
1712		return (1);
1713	if (!VESA_MODE(adp->va_mode))
1714		return (1);
1715
1716	bits = (adp->va_flags & V_ADP_DAC8) != 0 ? 8 : 6;
1717	r = malloc(count * 3, M_DEVBUF, M_WAITOK);
1718	g = r + count;
1719	b = g + count;
1720	copyin(red, r, count);
1721	copyin(green, g, count);
1722	copyin(blue, b, count);
1723
1724	error = vesa_bios_load_palette2(base, count, r, g, b, bits);
1725	free(r, M_DEVBUF);
1726
1727	return (error);
1728}
1729
1730static int
1731vesa_ioctl(video_adapter_t *adp, u_long cmd, caddr_t arg)
1732{
1733	int bytes;
1734
1735	if (adp != vesa_adp)
1736		return ((*prevvidsw->ioctl)(adp, cmd, arg));
1737
1738	switch (cmd) {
1739	case FBIO_SETWINORG:	/* set frame buffer window origin */
1740		if (!VESA_MODE(adp->va_mode))
1741			return (*prevvidsw->ioctl)(adp, cmd, arg);
1742		return (vesa_set_origin(adp, *(off_t *)arg) ? ENODEV : 0);
1743
1744	case FBIO_SETDISPSTART:	/* set display start address */
1745		if (!VESA_MODE(adp->va_mode))
1746			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1747		if (vesa_bios_set_start(((video_display_start_t *)arg)->x,
1748					((video_display_start_t *)arg)->y))
1749			return (ENODEV);
1750		adp->va_disp_start.x = ((video_display_start_t *)arg)->x;
1751		adp->va_disp_start.y = ((video_display_start_t *)arg)->y;
1752		return (0);
1753
1754	case FBIO_SETLINEWIDTH:	/* set line length in pixel */
1755		if (!VESA_MODE(adp->va_mode))
1756			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1757		if (vesa_bios_set_line_length(*(u_int *)arg, &bytes, NULL))
1758			return (ENODEV);
1759		adp->va_line_width = bytes;
1760#if VESA_DEBUG > 1
1761		printf("new line width:%d\n", adp->va_line_width);
1762#endif
1763		return (0);
1764
1765	case FBIO_GETPALETTE:	/* get color palette */
1766		if (get_palette(adp, ((video_color_palette_t *)arg)->index,
1767				((video_color_palette_t *)arg)->count,
1768				((video_color_palette_t *)arg)->red,
1769				((video_color_palette_t *)arg)->green,
1770				((video_color_palette_t *)arg)->blue,
1771				((video_color_palette_t *)arg)->transparent))
1772			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1773		return (0);
1774
1775
1776	case FBIO_SETPALETTE:	/* set color palette */
1777		if (set_palette(adp, ((video_color_palette_t *)arg)->index,
1778				((video_color_palette_t *)arg)->count,
1779				((video_color_palette_t *)arg)->red,
1780				((video_color_palette_t *)arg)->green,
1781				((video_color_palette_t *)arg)->blue,
1782				((video_color_palette_t *)arg)->transparent))
1783			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1784		return (0);
1785
1786	case FBIOGETCMAP:	/* get color palette */
1787		if (get_palette(adp, ((struct fbcmap *)arg)->index,
1788				((struct fbcmap *)arg)->count,
1789				((struct fbcmap *)arg)->red,
1790				((struct fbcmap *)arg)->green,
1791				((struct fbcmap *)arg)->blue, NULL))
1792			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1793		return (0);
1794
1795	case FBIOPUTCMAP:	/* set color palette */
1796		if (set_palette(adp, ((struct fbcmap *)arg)->index,
1797				((struct fbcmap *)arg)->count,
1798				((struct fbcmap *)arg)->red,
1799				((struct fbcmap *)arg)->green,
1800				((struct fbcmap *)arg)->blue, NULL))
1801			return ((*prevvidsw->ioctl)(adp, cmd, arg));
1802		return (0);
1803
1804	default:
1805		return ((*prevvidsw->ioctl)(adp, cmd, arg));
1806	}
1807}
1808
1809static int
1810vesa_diag(video_adapter_t *adp, int level)
1811{
1812	int error;
1813
1814	/* call the previous handler first */
1815	error = (*prevvidsw->diag)(adp, level);
1816	if (error)
1817		return (error);
1818
1819	if (adp != vesa_adp)
1820		return (1);
1821
1822	if (level <= 0)
1823		return (0);
1824
1825	return (0);
1826}
1827
1828static int
1829vesa_bios_info(int level)
1830{
1831#if VESA_DEBUG > 1
1832	struct vesa_mode vmode;
1833	int i;
1834#endif
1835	uint16_t vers;
1836
1837	vers = vesa_adp_info->v_version;
1838
1839	if (bootverbose) {
1840		/* general adapter information */
1841		printf(
1842	"VESA: v%d.%d, %dk memory, flags:0x%x, mode table:%p (%x)\n",
1843		    (vers >> 12) * 10 + ((vers & 0x0f00) >> 8),
1844		    ((vers & 0x00f0) >> 4) * 10 + (vers & 0x000f),
1845		    vesa_adp_info->v_memsize * 64, vesa_adp_info->v_flags,
1846		    vesa_vmodetab, vesa_adp_info->v_modetable);
1847
1848		/* OEM string */
1849		if (vesa_oemstr != NULL)
1850			printf("VESA: %s\n", vesa_oemstr);
1851	}
1852
1853	if (level <= 0)
1854		return (0);
1855
1856	if (vers >= 0x0200 && bootverbose) {
1857		/* vender name, product name, product revision */
1858		printf("VESA: %s %s %s\n",
1859			(vesa_venderstr != NULL) ? vesa_venderstr : "unknown",
1860			(vesa_prodstr != NULL) ? vesa_prodstr : "unknown",
1861			(vesa_revstr != NULL) ? vesa_revstr : "?");
1862	}
1863
1864#if VESA_DEBUG > 1
1865	/* mode information */
1866	for (i = 0;
1867		(i < (M_VESA_MODE_MAX - M_VESA_BASE + 1))
1868		&& (vesa_vmodetab[i] != 0xffff); ++i) {
1869		if (vesa_bios_get_mode(vesa_vmodetab[i], &vmode, M_NOWAIT))
1870			continue;
1871
1872		/* print something for diagnostic purpose */
1873		printf("VESA: mode:0x%03x, flags:0x%04x",
1874		       vesa_vmodetab[i], vmode.v_modeattr);
1875		if (vmode.v_modeattr & V_MODEOPTINFO) {
1876			if (vmode.v_modeattr & V_MODEGRAPHICS) {
1877				printf(", G %dx%dx%d %d, ",
1878				       vmode.v_width, vmode.v_height,
1879				       vmode.v_bpp, vmode.v_planes);
1880			} else {
1881				printf(", T %dx%d, ",
1882				       vmode.v_width, vmode.v_height);
1883			}
1884			printf("font:%dx%d, ",
1885			       vmode.v_cwidth, vmode.v_cheight);
1886			printf("pages:%d, mem:%d",
1887			       vmode.v_ipages + 1, vmode.v_memmodel);
1888		}
1889		if (vmode.v_modeattr & V_MODELFB) {
1890			printf("\nVESA: LFB:0x%x, off:0x%x, off_size:0x%x",
1891			       vmode.v_lfb, vmode.v_offscreen,
1892			       vmode.v_offscreensize*1024);
1893		}
1894		printf("\n");
1895		printf("VESA: window A:0x%x (%x), window B:0x%x (%x), ",
1896		       vmode.v_waseg, vmode.v_waattr,
1897		       vmode.v_wbseg, vmode.v_wbattr);
1898		printf("size:%dk, gran:%dk\n",
1899		       vmode.v_wsize, vmode.v_wgran);
1900	}
1901#endif /* VESA_DEBUG > 1 */
1902
1903	return (0);
1904}
1905
1906/* module loading */
1907
1908static int
1909vesa_load(void)
1910{
1911	int error;
1912
1913	if (vesa_init_done)
1914		return (0);
1915
1916	mtx_init(&vesa_lock, "VESA lock", NULL, MTX_DEF);
1917
1918	/* locate a VGA adapter */
1919	vesa_adp = NULL;
1920	error = vesa_configure(0);
1921
1922	if (error == 0)
1923		vesa_bios_info(bootverbose);
1924
1925	return (error);
1926}
1927
1928static int
1929vesa_unload(void)
1930{
1931	u_char palette[256*3];
1932	int error;
1933
1934	/* if the adapter is currently in a VESA mode, don't unload */
1935	if ((vesa_adp != NULL) && VESA_MODE(vesa_adp->va_mode))
1936		return (EBUSY);
1937	/*
1938	 * FIXME: if there is at least one vty which is in a VESA mode,
1939	 * we shouldn't be unloading! XXX
1940	 */
1941
1942	if ((error = vesa_unload_ioctl()) == 0) {
1943		if (vesa_adp != NULL) {
1944			if ((vesa_adp->va_flags & V_ADP_DAC8) != 0) {
1945				vesa_bios_save_palette(0, 256, palette, 8);
1946				vesa_bios_set_dac(6);
1947				vesa_adp->va_flags &= ~V_ADP_DAC8;
1948				vesa_bios_load_palette(0, 256, palette, 6);
1949			}
1950			vesa_adp->va_flags &= ~V_ADP_VESA;
1951			vidsw[vesa_adp->va_index] = prevvidsw;
1952		}
1953	}
1954
1955	vesa_bios_uninit();
1956	mtx_destroy(&vesa_lock);
1957
1958	return (error);
1959}
1960
1961static int
1962vesa_mod_event(module_t mod, int type, void *data)
1963{
1964
1965	switch (type) {
1966	case MOD_LOAD:
1967		return (vesa_load());
1968	case MOD_UNLOAD:
1969		return (vesa_unload());
1970	}
1971	return (EOPNOTSUPP);
1972}
1973
1974static moduledata_t vesa_mod = {
1975	"vesa",
1976	vesa_mod_event,
1977	NULL,
1978};
1979
1980DECLARE_MODULE(vesa, vesa_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
1981MODULE_DEPEND(vesa, x86bios, 1, 1, 1);
1982
1983#endif	/* VGA_NO_MODE_CHANGE */
1984