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Linux kernel mirror (for testing)
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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 __ASSEMBLER__
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
29int apply_alternatives_module(void *start, size_t length);
30#else
31static inline int apply_alternatives_module(void *start, size_t length)
32{
33 return 0;
34}
35#endif
36
37void alt_cb_patch_nops(struct alt_instr *alt, __le32 *origptr,
38 __le32 *updptr, int nr_inst);
39
40#endif /* __ASSEMBLER__ */
41#endif /* __ASM_ALTERNATIVE_H */