| 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(filename: dtb, size: &size); |
| 19 | if (area) { |
| 20 | if (!early_init_dt_scan(params: area)) { |
| 21 | pr_err("invalid DTB %s\n", dtb); |
| 22 | memblock_free(ptr: area, size); |
| 23 | return; |
| 24 | } |
| 25 | |
| 26 | early_init_fdt_scan_reserved_mem(); |
| 27 | } |
| 28 | |
| 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 | ); |
| 42 |