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 #include "opt_platform.h" 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/bus.h> 35 #include <sys/linker.h> 36 37 #include <machine/metadata.h> 38 #include <x86/fdt.h> 39 40 #include <dev/fdt/fdt_common.h> 41 #include <dev/ofw/openfirm.h> 42 43 int 44 x86_init_fdt(void) 45 { 46 void *dtbp, *mdp; 47 int error; 48 49 if (!OF_install(OFW_FDT, 0)) { 50 error = ENXIO; 51 goto out; 52 } 53 54 mdp = preload_search_by_type("elf kernel"); 55 if (mdp == NULL) 56 mdp = preload_search_by_type("elf32 kernel"); 57 dtbp = MD_FETCH(mdp, MODINFOMD_DTBP, void *); 58 59 #if defined(FDT_DTB_STATIC) 60 /* 61 * In case the device tree blob was not retrieved (from metadata) try 62 * to use the statically embedded one. 63 */ 64 if (dtbp == NULL) 65 dtbp = &fdt_static_dtb; 66 #endif 67 68 if (dtbp == NULL) { 69 error = ENOENT; 70 goto out; 71 } 72 73 error = OF_init(dtbp) ? ENXIO : 0; 74 75 out: 76 return (error); 77 } 78