2 * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
26 #include <ipxe/uaccess.h>
27 #include <ipxe/settings.h>
35 /** Video RAM base address */
36 #define VRAM_BASE 0xb8000
38 /** Video RAM length */
40 ( 80 /* columns */ * 25 /* rows */ * 2 /* bytes per character */ )
43 * Fetch video RAM setting
45 * @v data Buffer to fill with setting data
46 * @v len Length of buffer
47 * @ret len Length of setting data, or negative error
49 static int vram_fetch ( void *data, size_t len ) {
50 userptr_t vram = phys_to_user ( VRAM_BASE );
55 copy_from_user ( data, vram, 0, len );
60 /** Video RAM setting */
61 const struct setting vram_setting __setting ( SETTING_MISC, vram ) = {
63 .description = "Video RAM",
64 .type = &setting_type_base64,
65 .scope = &builtin_scope,
68 /** Video RAM built-in setting */
69 struct builtin_setting vram_builtin_setting __builtin_setting = {
70 .setting = &vram_setting,