1 /*- 2 * Copyright (c) 2013 Juniper Networks, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 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) == FALSE) { 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