1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/types.h>
3 #include <linux/init.h>
4 #include <linux/libfdt.h>
5
6 /*
7 * Declare the functions that are exported (but prefixed) here so that LLVM
8 * does not complain it lacks the 'static' keyword (which, if added, makes
9 * LLVM complain because the function is actually unused in this file).
10 */
11 u64 get_kaslr_seed(uintptr_t dtb_pa);
12
13 u64 get_kaslr_seed(uintptr_t dtb_pa)
14 {
15 int node, len;
16 fdt64_t *prop;
17 u64 ret;
18
19 node = fdt_path_offset((void *)dtb_pa, "/chosen");
20 if (node < 0)
21 return 0;
22
23 prop = fdt_getprop_w((void *)dtb_pa, node, "kaslr-seed", &len);
24 if (!prop || len != sizeof(u64))
25 return 0;
26
27 ret = fdt64_to_cpu(*prop);
28 *prop = 0;
29 return ret;
30 }
31
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