efifb.c revision 271120 
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: stable/10/sys/dev/vt/hw/efifb/efifb.c 271120 2014-09-04 19:13:07Z emaste $
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/10/sys/dev/vt/hw/efifb/efifb.c 271120 2014-09-04 19:13:07Z emaste $");
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/metadata.h>
44#include <machine/vm.h>
45#include <machine/vmparam.h>
46#include <vm/vm.h>
47#include <vm/pmap.h>
48#include <machine/pmap.h>
49
50#include <dev/vt/vt.h>
51#include <dev/vt/hw/fb/vt_fb.h>
52#include <dev/vt/colors/vt_termcolors.h>
53
54static vd_init_t vt_efifb_init;
55static vd_probe_t vt_efifb_probe;
56static void vt_efifb_remap(void *efifb_data);
57
58static struct vt_driver vt_efifb_driver = {
59	.vd_name = "efifb",
60	.vd_probe = vt_efifb_probe,
61	.vd_init = vt_efifb_init,
62	.vd_blank = vt_fb_blank,
63	.vd_bitbltchr = vt_fb_bitbltchr,
64	.vd_fb_ioctl = vt_fb_ioctl,
65	.vd_fb_mmap = vt_fb_mmap,
66	/* Better than VGA, but still generic driver. */
67	.vd_priority = VD_PRIORITY_GENERIC + 1,
68};
69
70static struct fb_info local_info;
71VT_DRIVER_DECLARE(vt_efifb, vt_efifb_driver);
72
73SYSINIT(efifb_remap, SI_SUB_KMEM, SI_ORDER_ANY, vt_efifb_remap, &local_info);
74
75static int
76vt_efifb_probe(struct vt_device *vd)
77{
78	int		disabled;
79	struct efi_fb	*efifb;
80	caddr_t		kmdp;
81
82	disabled = 0;
83	TUNABLE_INT_FETCH("hw.syscons.disable", &disabled);
84	if (disabled != 0)
85		return (CN_DEAD);
86
87	kmdp = preload_search_by_type("elf kernel");
88	if (kmdp == NULL)
89		kmdp = preload_search_by_type("elf64 kernel");
90	efifb = (struct efi_fb *)preload_search_info(kmdp,
91	    MODINFO_METADATA | MODINFOMD_EFI_FB);
92	if (efifb == NULL)
93		return (CN_DEAD);
94
95	return (CN_INTERNAL);
96}
97
98static int
99vt_efifb_init(struct vt_device *vd)
100{
101	int		depth, d;
102	struct fb_info	*info;
103	struct efi_fb	*efifb;
104	caddr_t		kmdp;
105
106	info = vd->vd_softc;
107	if (info == NULL)
108		info = vd->vd_softc = (void *)&local_info;
109
110	kmdp = preload_search_by_type("elf kernel");
111	if (kmdp == NULL)
112		kmdp = preload_search_by_type("elf64 kernel");
113	efifb = (struct efi_fb *)preload_search_info(kmdp,
114	    MODINFO_METADATA | MODINFOMD_EFI_FB);
115	if (efifb == NULL)
116		return (CN_DEAD);
117
118	info->fb_height = efifb->fb_height;
119	info->fb_width = efifb->fb_width;
120
121	depth = fls(efifb->fb_mask_red);
122	d = fls(efifb->fb_mask_green);
123	depth = d > depth ? d : depth;
124	d = fls(efifb->fb_mask_blue);
125	depth = d > depth ? d : depth;
126	d = fls(efifb->fb_mask_reserved);
127	depth = d > depth ? d : depth;
128	info->fb_depth = depth;
129
130	info->fb_stride = efifb->fb_stride * (depth / 8);
131
132	vt_generate_cons_palette(info->fb_cmap, COLOR_FORMAT_RGB,
133	    efifb->fb_mask_red, ffs(efifb->fb_mask_red) - 1,
134	    efifb->fb_mask_green, ffs(efifb->fb_mask_green) - 1,
135	    efifb->fb_mask_blue, ffs(efifb->fb_mask_blue) - 1);
136
137	info->fb_size = info->fb_height * info->fb_stride;
138	info->fb_pbase = efifb->fb_addr;
139	/*
140	 * Use the direct map as a crutch until pmap is available. Once pmap
141	 * is online, the framebuffer will be remapped by vt_efifb_remap()
142	 * using pmap_mapdev_attr().
143	 */
144	info->fb_vbase = PHYS_TO_DMAP(efifb->fb_addr);
145
146	/* Get pixel storage size. */
147	info->fb_bpp = info->fb_stride / info->fb_width * 8;
148
149	/*
150	 * Early FB driver work with static window buffer, so reduce to minimal
151	 * size, buffer or screen.
152	 */
153	info->fb_width = MIN(info->fb_width, VT_FB_DEFAULT_WIDTH);
154	info->fb_height = MIN(info->fb_height, VT_FB_DEFAULT_HEIGHT);
155
156	vt_fb_init(vd);
157
158	return (CN_INTERNAL);
159}
160
161static void
162vt_efifb_remap(void *xinfo)
163{
164	struct fb_info *info = xinfo;
165
166	if (info->fb_pbase == 0)
167		return;
168
169	/*
170	 * Remap as write-combining. This massively improves performance and
171	 * happens very early in kernel initialization, when everything is
172	 * still single-threaded and interrupts are off, so replacing the
173	 * mapping address is safe.
174	 */
175	info->fb_vbase = (intptr_t)pmap_mapdev_attr(info->fb_pbase,
176	    info->fb_size, VM_MEMATTR_WRITE_COMBINING);
177}
178
179