1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_ALTERNATIVE_H
3#define __ASM_ALTERNATIVE_H
4
5#include <asm/alternative-macros.h>
6
7#ifndef __ASSEMBLY__
8
9#include <linux/init.h>
10#include <linux/types.h>
11#include <linux/stddef.h>
12
13struct alt_instr {
14	s32 orig_offset;	/* offset to original instruction */
15	s32 alt_offset;		/* offset to replacement instruction */
16	u16 cpucap;		/* cpucap bit set for replacement */
17	u8  orig_len;		/* size of original instruction(s) */
18	u8  alt_len;		/* size of new instruction(s), <= orig_len */
19};
20
21typedef void (*alternative_cb_t)(struct alt_instr *alt,
22				 __le32 *origptr, __le32 *updptr, int nr_inst);
23
24void __init apply_boot_alternatives(void);
25void __init apply_alternatives_all(void);
26bool alternative_is_applied(u16 cpucap);
27
28#ifdef CONFIG_MODULES
29void apply_alternatives_module(void *start, size_t length);
30#else
31static inline void apply_alternatives_module(void *start, size_t length) { }
32#endif
33
34void alt_cb_patch_nops(struct alt_instr *alt, __le32 *origptr,
35		       __le32 *updptr, int nr_inst);
36
37#endif /* __ASSEMBLY__ */
38#endif /* __ASM_ALTERNATIVE_H */
39