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
13 struct 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
21 typedef void (*alternative_cb_t)(struct alt_instr *alt,
22 __le32 *origptr, __le32 *updptr, int nr_inst);
23
24 void __init apply_boot_alternatives(void);
25 void __init apply_alternatives_all(void);
26 bool alternative_is_applied(u16 cpucap);
27
28 #ifdef CONFIG_MODULES
29 void apply_alternatives_module(void *start, size_t length);
30 #else
31 static inline void apply_alternatives_module(void *start, size_t length) { }
32 #endif
33
34 void 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
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