arch/um/kernel/dtb.c

   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
  11 static char *dtb __initdata;
  12
  13 void 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
  32 static 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 );