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
43int
44x86_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