efifb.c revision 262785 
1/*-
2 * Copyright (c) 2014 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Aleksandr Rybalko under sponsorship from the
6 * FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: head/sys/dev/vt/hw/efifb/efifb.c 262785 2014-03-05 14:37:45Z ray $
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/dev/vt/hw/efifb/efifb.c 262785 2014-03-05 14:37:45Z ray $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/fbio.h>
39#include <sys/linker.h>
40
41#include "opt_platform.h"
42
43#include <machine/efi.h>
44#include <machine/metadata.h>
45#include <machine/vm.h>
46#include <machine/vmparam.h>
47#include <vm/vm.h>
48#include <vm/pmap.h>
49#include <machine/pmap.h>
50
51#include <dev/vt/vt.h>
52#include <dev/vt/hw/fb/vt_fb.h>
53#include <dev/vt/colors/vt_termcolors.h>
54
55static vd_init_t vt_efb_init;
56
57static struct vt_driver vt_efb_driver = {
58	.vd_init = vt_efb_init,
59	.vd_blank = vt_fb_blank,
60	.vd_bitbltchr = vt_fb_bitbltchr,
61	/* Better than VGA, but still generic driver. */
62	.vd_priority = VD_PRIORITY_GENERIC + 1,
63};
64
65static struct fb_info info;
66VT_CONSDEV_DECLARE(vt_efb_driver,
67    MAX(80, PIXEL_WIDTH(VT_FB_DEFAULT_WIDTH)),
68    MAX(25, PIXEL_HEIGHT(VT_FB_DEFAULT_HEIGHT)), &info);
69
70static int
71vt_efb_init(struct vt_device *vd)
72{
73	int		depth, d, disable, i, len;
74	struct fb_info	*info;
75	struct efi_fb	*efifb;
76	caddr_t		kmdp;
77
78	info = vd->vd_softc;
79
80	disable = 0;
81	TUNABLE_INT_FETCH("hw.syscons.disable", &disable);
82	if (disable != 0)
83		return (CN_DEAD);
84
85	kmdp = preload_search_by_type("elf kernel");
86	if (kmdp == NULL)
87		kmdp = preload_search_by_type("elf64 kernel");
88        efifb = (struct efi_fb *)preload_search_info(kmdp,
89            MODINFO_METADATA | MODINFOMD_EFI_FB);
90        if (!efifb->fb_present)
91		return (CN_DEAD);
92
93	info->fb_height = efifb->fb_height;
94	info->fb_width = efifb->fb_width;
95
96	depth = fls(efifb->fb_mask_red);
97	d = fls(efifb->fb_mask_green);
98	depth = d > depth ? d : depth;
99	d = fls(efifb->fb_mask_blue);
100	depth = d > depth ? d : depth;
101	d = fls(efifb->fb_mask_reserved);
102	depth = d > depth ? d : depth;
103	info->fb_depth = depth;
104
105	info->fb_stride = efifb->fb_stride * (depth / 8);
106
107	vt_generate_vga_palette(info->fb_cmap, COLOR_FORMAT_RGB,
108	    efifb->fb_mask_red, ffs(efifb->fb_mask_red) - 1,
109	    efifb->fb_mask_green, ffs(efifb->fb_mask_green) - 1,
110	    efifb->fb_mask_blue, ffs(efifb->fb_mask_blue) - 1);
111
112	info->fb_size = info->fb_height * info->fb_stride;
113	info->fb_pbase = efifb->fb_addr;
114	/*
115	 * We could use pmap_mapdev here except that the kernel pmap
116	 * hasn't been created yet and hence any attempt to lock it will
117	 * fail.
118	 */
119	info->fb_vbase = PHYS_TO_DMAP(efifb->fb_addr);
120
121	/* blank full size */
122	len = info->fb_size / 4;
123	for (i = 0; i < len; i++) {
124		((uint32_t *)info->fb_vbase)[i] = 0;
125	}
126
127	/* Get pixel storage size. */
128	info->fb_bpp = info->fb_stride / info->fb_width * 8;
129
130	/*
131	 * Early FB driver work with static window buffer, so reduce to minimal
132	 * size, buffer or screen.
133	 */
134	info->fb_width = MIN(info->fb_width, VT_FB_DEFAULT_WIDTH);
135	info->fb_height = MIN(info->fb_height, VT_FB_DEFAULT_HEIGHT);
136
137	fb_probe(info);
138	vt_fb_init(vd);
139
140
141	return (CN_INTERNAL);
142}
143
144