diff --git a/src/core/fdt.c b/src/core/fdt.c index b7289fd36..ad83ed69a 100644 --- a/src/core/fdt.c +++ b/src/core/fdt.c @@ -28,6 +28,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include #include #include +#include #include /** @file @@ -39,6 +40,11 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); /** The system flattened device tree (if present) */ static struct fdt fdt; +/** The downloaded flattened device tree tag */ +struct image_tag fdt_image __image_tag = { + .name = "FDT", +}; + /** A position within a device tree */ struct fdt_cursor { /** Offset within structure block */ diff --git a/src/include/ipxe/fdt.h b/src/include/ipxe/fdt.h index 9b9b01b6c..995975ed8 100644 --- a/src/include/ipxe/fdt.h +++ b/src/include/ipxe/fdt.h @@ -10,6 +10,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include +#include struct net_device; @@ -93,6 +94,8 @@ struct fdt { size_t strings_len; }; +extern struct image_tag fdt_image __image_tag; + extern int fdt_path ( const char *path, unsigned int *offset ); extern int fdt_alias ( const char *name, unsigned int *offset ); extern const char * fdt_string ( unsigned int offset, const char *name ); diff --git a/src/include/usr/fdtmgmt.h b/src/include/usr/fdtmgmt.h new file mode 100644 index 000000000..3d3aef859 --- /dev/null +++ b/src/include/usr/fdtmgmt.h @@ -0,0 +1,16 @@ +#ifndef _USR_FDTMGMT_H +#define _USR_FDTMGMT_H + +/** @file + * + * Flattened Device Tree management + * + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +#include + +extern int imgfdt ( struct image *image ); + +#endif /* _USR_FDTMGMT_H */ 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; +}