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