efifb.c revision 268624 
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 268624 2014-07-14 17:42:22Z nwhitehorn $
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/dev/vt/hw/efifb/efifb.c 268624 2014-07-14 17:42:22Z nwhitehorn $");
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_maskbitbltchr = vt_fb_maskbitbltchr,
65	/* Better than VGA, but still generic driver. */
66	.vd_priority = VD_PRIORITY_GENERIC + 1,
67};
68
69static struct fb_info local_info;
70VT_DRIVER_DECLARE(vt_efifb, vt_efifb_driver);
71
72SYSINIT(efifb_remap, SI_SUB_KMEM, SI_ORDER_ANY, vt_efifb_remap, &local_info);
73
74static int
75vt_efifb_probe(struct vt_device *vd)
76{
77	int		disabled;
78	struct efi_fb	*efifb;
79	caddr_t		kmdp;
80
81	disabled = 0;
82	TUNABLE_INT_FETCH("hw.syscons.disable", &disabled);
83	if (disabled != 0)
84		return (CN_DEAD);
85
86	kmdp = preload_search_by_type("elf kernel");
87	if (kmdp == NULL)
88		kmdp = preload_search_by_type("elf64 kernel");
89	efifb = (struct efi_fb *)preload_search_info(kmdp,
90	    MODINFO_METADATA | MODINFOMD_EFI_FB);
91	if (efifb == NULL)
92		return (CN_DEAD);
93
94	return (CN_INTERNAL);
95}
96
97static int
98vt_efifb_init(struct vt_device *vd)
99{
100	int		depth, d, i, len;
101	struct fb_info	*info;
102	struct efi_fb	*efifb;
103	caddr_t		kmdp;
104
105	info = vd->vd_softc;
106	if (info == NULL)
107		info = vd->vd_softc = (void *)&local_info;
108
109	kmdp = preload_search_by_type("elf kernel");
110	if (kmdp == NULL)
111		kmdp = preload_search_by_type("elf64 kernel");
112	efifb = (struct efi_fb *)preload_search_info(kmdp,
113	    MODINFO_METADATA | MODINFOMD_EFI_FB);
114	if (efifb == NULL)
115		return (CN_DEAD);
116
117	info->fb_height = efifb->fb_height;
118	info->fb_width = efifb->fb_width;
119
120	depth = fls(efifb->fb_mask_red);
121	d = fls(efifb->fb_mask_green);
122	depth = d > depth ? d : depth;
123	d = fls(efifb->fb_mask_blue);
124	depth = d > depth ? d : depth;
125	d = fls(efifb->fb_mask_reserved);
126	depth = d > depth ? d : depth;
127	info->fb_depth = depth;
128
129	info->fb_stride = efifb->fb_stride * (depth / 8);
130
131	vt_generate_vga_palette(info->fb_cmap, COLOR_FORMAT_RGB,
132	    efifb->fb_mask_red, ffs(efifb->fb_mask_red) - 1,
133	    efifb->fb_mask_green, ffs(efifb->fb_mask_green) - 1,
134	    efifb->fb_mask_blue, ffs(efifb->fb_mask_blue) - 1);
135
136	info->fb_size = info->fb_height * info->fb_stride;
137	info->fb_pbase = efifb->fb_addr;
138	/*
139	 * Use the direct map as a crutch until pmap is available. Once pmap
140	 * is online, the framebuffer will be remapped by vt_efifb_remap()
141	 * using pmap_mapdev_attr().
142	 */
143	info->fb_vbase = PHYS_TO_DMAP(efifb->fb_addr);
144
145	/* blank full size */
146	len = info->fb_size / 4;
147	for (i = 0; i < len; i++) {
148		((uint32_t *)info->fb_vbase)[i] = 0;
149	}
150
151	/* Get pixel storage size. */
152	info->fb_bpp = info->fb_stride / info->fb_width * 8;
153
154	/*
155	 * Early FB driver work with static window buffer, so reduce to minimal
156	 * size, buffer or screen.
157	 */
158	info->fb_width = MIN(info->fb_width, VT_FB_DEFAULT_WIDTH);
159	info->fb_height = MIN(info->fb_height, VT_FB_DEFAULT_HEIGHT);
160
161	fb_probe(info);
162	vt_fb_init(vd);
163
164	/* Clear the screen. */
165	vt_fb_blank(vd, TC_BLACK);
166
167	return (CN_INTERNAL);
168}
169
170static void
171vt_efifb_remap(void *xinfo)
172{
173	struct fb_info *info = xinfo;
174
175	if (info->fb_pbase == 0)
176		return;
177
178	/*
179	 * Remap as write-combining. This massively improves performance and
180	 * happens very early in kernel initialization, when everything is
181	 * still single-threaded and interrupts are off, so replacing the
182	 * mapping address is safe.
183	 */
184	info->fb_vbase = (intptr_t)pmap_mapdev_attr(info->fb_pbase,
185	    info->fb_size, VM_MEMATTR_WRITE_COMBINING);
186}
187
188