From cfd93465ec9d5e47447564cd4cedabc43390c12b Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Thu, 27 Mar 2025 11:30:27 +0000 Subject: [fdt] Add the concept of an FDT image Define the concept of an "FDT" image, representing a Flattened Device Tree blob that has been downloaded in order to be provided to a kernel or other executable image. FDT images are represented using an image tag (as with other special-purpose images such as the UEFI shim), and are similarly marked as hidden so that they will not be included in a generated magic initrd or show up in a virtual filesystem directory listing. Signed-off-by: Michael Brown --- src/usr/fdtmgmt.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 src/usr/fdtmgmt.c (limited to 'src/usr') diff --git a/src/usr/fdtmgmt.c b/src/usr/fdtmgmt.c new file mode 100644 index 000000000..dabeef2c8 --- /dev/null +++ b/src/usr/fdtmgmt.c @@ -0,0 +1,51 @@ +/* + * Copyright (C) 2025 Michael Brown . + * + * 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 +#include + +/** @file + * + * Flattened Device Tree management + * + */ + +/** + * Apply flattened device tree image + * + * @v image FDT image, or NULL to clear FDT + * @ret rc Return status code + */ +int imgfdt ( struct image *image ) { + + /* Record (or clear) FDT image */ + image_tag ( image, &fdt_image ); + + /* Avoid including image in constructed initrd */ + if ( image ) + image_hide ( image ); + + return 0; +} -- cgit v1.2.3-55-g7522