| /* |
| * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of the |
| * License, or any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA. |
| * |
| * You can also choose to distribute this program under the terms of |
| * the Unmodified Binary Distribution Licence (as given in the file |
| * COPYING.UBDL), provided that you have satisfied its requirements. |
| */ |
| |
| FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); |
| |
| #include <ipxe/uaccess.h> |
| #include <ipxe/settings.h> |
| |
| /** @file |
| * |
| * Video RAM dump |
| * |
| */ |
| |
| /** Video RAM base address */ |
| #define VRAM_BASE 0xb8000 |
| |
| /** Video RAM length */ |
| #define VRAM_LEN \ |
| ( 80 /* columns */ * 25 /* rows */ * 2 /* bytes per character */ ) |
| |
| /** |
| * Fetch video RAM setting |
| * |
| * @v data Buffer to fill with setting data |
| * @v len Length of buffer |
| * @ret len Length of setting data, or negative error |
| */ |
| static int vram_fetch ( void *data, size_t len ) { |
| userptr_t vram = phys_to_user ( VRAM_BASE ); |
| |
| /* Copy video RAM */ |
| if ( len > VRAM_LEN ) |
| len = VRAM_LEN; |
| copy_from_user ( data, vram, 0, len ); |
| |
| return VRAM_LEN; |
| } |
| |
| /** Video RAM setting */ |
| const struct setting vram_setting __setting ( SETTING_MISC, vram ) = { |
| .name = "vram", |
| .description = "Video RAM", |
| .type = &setting_type_base64, |
| .scope = &builtin_scope, |
| }; |
| |
| /** Video RAM built-in setting */ |
| struct builtin_setting vram_builtin_setting __builtin_setting = { |
| .setting = &vram_setting, |
| .fetch = vram_fetch, |
| }; |