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 cpufeature;		/* cpufeature 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 cpufeature);
27 
28 #ifdef CONFIG_MODULES
29 void apply_alternatives_module(void *start, size_t length);
30 #else
apply_alternatives_module(void * start,size_t length)31 static inline void apply_alternatives_module(void *start, size_t length) { }
32 #endif
33 
34 #endif /* __ASSEMBLY__ */
35 #endif /* __ASM_ALTERNATIVE_H */
36