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[efi] Register a device tree if provided by the platform firmware
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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/* | ||
* Copyright (C) 2019 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 (at your option) 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 <string.h> | ||
#include <ipxe/fdt.h> | ||
#include <ipxe/efi/efi.h> | ||
#include <ipxe/init.h> | ||
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/** @file | ||
* | ||
* EFI Flattened Device Tree | ||
* | ||
*/ | ||
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#define DEVICE_TREE_TABLE_GUID \ | ||
{ 0xb1b621d5, 0xf19c, 0x41a5, \ | ||
{ 0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0 } } | ||
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/** EFI Flattened Device Tree configuration table */ | ||
static struct fdt_header *efi_fdt; | ||
EFI_USE_TABLE ( DEVICE_TREE_TABLE, &efi_fdt, 0 ); | ||
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/** | ||
* Initialise EFI Flattened Device Tree | ||
* | ||
*/ | ||
static void efi_fdt_init ( void ) { | ||
int rc; | ||
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/* Do nothing if no configuration table is present */ | ||
if ( ! efi_fdt ) { | ||
DBGC ( &efi_fdt, "EFIFDT has no configuration table\n" ); | ||
return; | ||
} | ||
DBGC ( &efi_fdt, "EFIFDT configuration table at %p\n", efi_fdt ); | ||
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/* Register device tree */ | ||
if ( ( rc = register_fdt ( efi_fdt ) ) != 0 ) { | ||
DBGC ( &efi_fdt, "EFIFDT could not register: %s\n", | ||
strerror ( rc ) ); | ||
return; | ||
} | ||
} | ||
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/** EFI Flattened Device Tree initialisation function */ | ||
struct init_fn efi_fdt_init_fn __init_fn ( INIT_EARLY ) = { | ||
.initialise = efi_fdt_init, | ||
}; |