1 /*
2  * Copyright (C) 2016 Imagination Technologies
3  * Author: Marcin Nowakowski <marcin.nowakowski@mips.com>
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License as published by the
7  * Free Software Foundation; either version 2 of the License, or (at your
8  * option) any later version.
9  */
10 
11 #include <linux/kexec.h>
12 #include <linux/libfdt.h>
13 #include <linux/uaccess.h>
14 
generic_kexec_prepare(struct kimage * image)15 static int generic_kexec_prepare(struct kimage *image)
16 {
17 	int i;
18 
19 	for (i = 0; i < image->nr_segments; i++) {
20 		struct fdt_header fdt;
21 
22 		if (image->segment[i].memsz <= sizeof(fdt))
23 			continue;
24 
25 		if (copy_from_user(&fdt, image->segment[i].buf, sizeof(fdt)))
26 			continue;
27 
28 		if (fdt_check_header(&fdt))
29 			continue;
30 
31 		kexec_args[0] = -2;
32 		kexec_args[1] = (unsigned long)
33 			phys_to_virt((unsigned long)image->segment[i].mem);
34 		break;
35 	}
36 	return 0;
37 }
38 
register_generic_kexec(void)39 static int __init register_generic_kexec(void)
40 {
41 	_machine_kexec_prepare = generic_kexec_prepare;
42 	return 0;
43 }
44 arch_initcall(register_generic_kexec);
45