1// SPDX-License-Identifier: GPL-2.0-only
 2
 3#include <linux/init.h>
 4#include <linux/of_fdt.h>
 5#include <linux/printk.h>
 6#include <linux/memblock.h>
 7#include <init.h>
 8
 9#include "um_arch.h"
10
11static char *dtb __initdata;
12
13void uml_dtb_init(void)
14{
15	long long size;
16	void *area;
17
18	area = uml_load_file(dtb, &size);
19	if (!area)
20		return;
21
22	if (!early_init_dt_scan(area)) {
23		pr_err("invalid DTB %s\n", dtb);
24		memblock_free(area, size);
25		return;
26	}
27
28	early_init_fdt_scan_reserved_mem();
29	unflatten_device_tree();
30}
31
32static int __init uml_dtb_setup(char *line, int *add)
33{
34	dtb = line;
35	return 0;
36}
37
38__uml_setup("dtb=", uml_dtb_setup,
39"dtb=<file>\n"
40"    Boot the kernel with the devicetree blob from the specified file.\n"
41);