arch/mips/generic/kexec.c

   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
  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
  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);