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 get_kaslr_seed(uintptr_t dtb_pa)13u64 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