arch/arm64/include/asm/alternative.h

   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
  31 static inline void apply_alternatives_module(void *start, size_t length) { }
  32 #endif
  33
  34 #endif /* __ASSEMBLY__ */
  35 #endif /* __ASM_ALTERNATIVE_H */