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 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 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 cpufeature); 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 34#endif /* __ASSEMBLY__ */ 35#endif /* __ASM_ALTERNATIVE_H */ 36