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[vram] Add "vram" built-in setting to dump video RAM
The "vram" setting returns the (Base64-encoded) contents of video RAM, and can be used to capture a screenshot. For example: after running memtest.0 and encountering an error, the output can be captured and sent to a remote server for later diagnosis: #!ipxe chain -a http://server/memtest.0 && goto ok || goto bad :bad params param errno ${errno} param vram ${vram} chain -a http://server/report.php##params :ok Inspired-by: Christian Nilsson <nikize@gmail.com> Originally-implemented-by: Christian Nilsson <nikize@gmail.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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/* | ||
* 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. | ||
*/ | ||
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); | ||
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#include <ipxe/uaccess.h> | ||
#include <ipxe/settings.h> | ||
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/** @file | ||
* | ||
* Video RAM dump | ||
* | ||
*/ | ||
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/** Video RAM base address */ | ||
#define VRAM_BASE 0xb8000 | ||
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/** Video RAM length */ | ||
#define VRAM_LEN \ | ||
( 80 /* columns */ * 25 /* rows */ * 2 /* bytes per character */ ) | ||
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/** | ||
* 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 ); | ||
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/* Copy video RAM */ | ||
if ( len > VRAM_LEN ) | ||
len = VRAM_LEN; | ||
copy_from_user ( data, vram, 0, len ); | ||
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return VRAM_LEN; | ||
} | ||
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/** Video RAM setting */ | ||
const struct setting vram_setting __setting ( SETTING_MISC, vram ) = { | ||
.name = "vram", | ||
.description = "Video RAM", | ||
.type = &setting_type_base64, | ||
.scope = &builtin_scope, | ||
}; | ||
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/** Video RAM built-in setting */ | ||
struct builtin_setting vram_builtin_setting __builtin_setting = { | ||
.setting = &vram_setting, | ||
.fetch = vram_fetch, | ||
}; |
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