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[efi] Register a device tree if provided by the platform firmware 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/94/head
Michael Brown 2019-07-19 17:42:12 +01:00
parent e520a51df1
commit 6dde0f60bf
3 changed files with 74 additions and 0 deletions
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3
src/config/config_fdt.c
View File

@ -36,3 +36,6 @@ PROVIDE_REQUIRING_SYMBOL();
/*
* Drag in devicetree sources
*/
#ifdef FDT_EFI
REQUIRE_OBJECT ( efi_fdt );
#endif

1
src/config/defaults/efi.h
View File

@ -22,6 +22,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define TIME_EFI
#define REBOOT_EFI
#define ACPI_EFI
#define FDT_EFI
#define DOWNLOAD_PROTO_FILE /* Local filesystem access */

70
src/interface/efi/efi_fdt.c 100644
View File

@ -0,0 +1,70 @@
/*
* 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.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <string.h>
#include <ipxe/fdt.h>
#include <ipxe/efi/efi.h>
#include <ipxe/init.h>
/** @file
*
* EFI Flattened Device Tree
*
*/
#define DEVICE_TREE_TABLE_GUID \
{ 0xb1b621d5, 0xf19c, 0x41a5, \
{ 0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0 } }
/** EFI Flattened Device Tree configuration table */
static struct fdt_header *efi_fdt;
EFI_USE_TABLE ( DEVICE_TREE_TABLE, &efi_fdt, 0 );
/**
* Initialise EFI Flattened Device Tree
*
*/
static void efi_fdt_init ( void ) {
int rc;
/* 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 );
/* Register device tree */
if ( ( rc = register_fdt ( efi_fdt ) ) != 0 ) {
DBGC ( &efi_fdt, "EFIFDT could not register: %s\n",
strerror ( rc ) );
return;
}
}
/** EFI Flattened Device Tree initialisation function */
struct init_fn efi_fdt_init_fn __init_fn ( INIT_EARLY ) = {
.initialise = efi_fdt_init,
};