1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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
45int
46x86_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