1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright 2023 Google LLC
3 // Author: Ard Biesheuvel <ardb@google.com>
4 
5 #include <linux/types.h>
6 
7 #define __prel64_initconst	__section(".init.rodata.prel64")
8 
9 #define PREL64(type, name)	union { type *name; prel64_t name ## _prel; }
10 
11 #define prel64_pointer(__d)	(typeof(__d))prel64_to_pointer(&__d##_prel)
12 
13 typedef volatile signed long prel64_t;
14 
15 static inline void *prel64_to_pointer(const prel64_t *offset)
16 {
17 	if (!*offset)
18 		return NULL;
19 	return (void *)offset + *offset;
20 }
21 
22 extern bool dynamic_scs_is_enabled;
23 
24 extern pgd_t init_idmap_pg_dir[], init_idmap_pg_end[];
25 extern pgd_t init_pg_dir[], init_pg_end[];
26 
27 void init_feature_override(u64 boot_status, const void *fdt, int chosen);
28 u64 kaslr_early_init(void *fdt, int chosen);
29 void relocate_kernel(u64 offset);
30 int scs_patch(const u8 eh_frame[], int size);
31 
32 void map_range(u64 *pgd, u64 start, u64 end, u64 pa, pgprot_t prot,
33 	       int level, pte_t *tbl, bool may_use_cont, u64 va_offset);
34 
35 asmlinkage void early_map_kernel(u64 boot_status, void *fdt);
36 
37 asmlinkage u64 create_init_idmap(pgd_t *pgd, ptdesc_t clrmask);
38