xref: /freebsd-11-stable/sys/x86/x86/fdt_machdep.c

/*-
 * Copyright (c) 2013 Juniper Networks, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_platform.h"

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/linker.h>

#include <machine/metadata.h>
#include <x86/fdt.h>

#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>

int
x86_init_fdt(void)
{
	void *dtbp, *mdp;
	int error;

	if (OF_install(OFW_FDT, 0) == FALSE) {
		error = ENXIO;
		goto out;
	}

	mdp = preload_search_by_type("elf kernel");
	if (mdp == NULL)
		mdp = preload_search_by_type("elf32 kernel");
	dtbp = MD_FETCH(mdp, MODINFOMD_DTBP, void *);

#if defined(FDT_DTB_STATIC)
	/*
	 * In case the device tree blob was not retrieved (from metadata) try
	 * to use the statically embedded one.
	 */
	if (dtbp == NULL)
		dtbp = &fdt_static_dtb;
#endif

	if (dtbp == NULL) {
		error = ENOENT;
		goto out;
	}

	error = OF_init(dtbp) ? ENXIO : 0;

 out:
	return (error);
}