1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 Juniper Networks, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_platform.h" 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/bus.h> 37 #include <sys/linker.h> 38 39 #include <machine/metadata.h> 40 #include <x86/fdt.h> 41 42 #include <dev/fdt/fdt_common.h> 43 #include <dev/ofw/openfirm.h> 44 45 int 46 x86_init_fdt(void) 47 { 48 void *dtbp, *mdp; 49 int error; 50 51 if (OF_install(OFW_FDT, 0) == FALSE) { 52 error = ENXIO; 53 goto out; 54 } 55 56 mdp = preload_search_by_type("elf kernel"); 57 if (mdp == NULL) 58 mdp = preload_search_by_type("elf32 kernel"); 59 dtbp = MD_FETCH(mdp, MODINFOMD_DTBP, void *); 60 61 #if defined(FDT_DTB_STATIC) 62 /* 63 * In case the device tree blob was not retrieved (from metadata) try 64 * to use the statically embedded one. 65 */ 66 if (dtbp == NULL) 67 dtbp = &fdt_static_dtb; 68 #endif 69 70 if (dtbp == NULL) { 71 error = ENOENT; 72 goto out; 73 } 74 75 error = OF_init(dtbp) ? ENXIO : 0; 76 77 out: 78 return (error); 79 } 80