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-rw-r--r--arch/arm64/include/asm/alternative.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/alternative.h b/arch/arm64/include/asm/alternative.h
new file mode 100644
index 000000000..a38b92e11
--- /dev/null
+++ b/arch/arm64/include/asm/alternative.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_ALTERNATIVE_H
+#define __ASM_ALTERNATIVE_H
+
+#include <asm/alternative-macros.h>
+
+#ifndef __ASSEMBLY__
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+
+struct alt_instr {
+ s32 orig_offset; /* offset to original instruction */
+ s32 alt_offset; /* offset to replacement instruction */
+ u16 cpufeature; /* cpufeature bit set for replacement */
+ u8 orig_len; /* size of original instruction(s) */
+ u8 alt_len; /* size of new instruction(s), <= orig_len */
+};
+
+typedef void (*alternative_cb_t)(struct alt_instr *alt,
+ __le32 *origptr, __le32 *updptr, int nr_inst);
+
+void __init apply_boot_alternatives(void);
+void __init apply_alternatives_all(void);
+bool alternative_is_applied(u16 cpufeature);
+
+#ifdef CONFIG_MODULES
+void apply_alternatives_module(void *start, size_t length);
+#else
+static inline void apply_alternatives_module(void *start, size_t length) { }
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_ALTERNATIVE_H */