Function encode_insn_immediate() will be used by other instruction
manipulate related functions, so move it into insn.c and rename it
as aarch64_insn_encode_immediate().
Reviewed-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NJiang Liu <liuj97@gmail.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

Introduce three interfaces to patch kernel and module code:
aarch64_insn_patch_text_nosync():
	patch code without synchronization, it's caller's responsibility
	to synchronize all CPUs if needed.
aarch64_insn_patch_text_sync():
	patch code and always synchronize with stop_machine()
aarch64_insn_patch_text():
	patch code and synchronize with stop_machine() if needed
Reviewed-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NJiang Liu <liuj97@gmail.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

Introduce basic aarch64 instruction decoding helper
aarch64_get_insn_class() and aarch64_insn_hotpatch_safe().
Reviewed-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NJiang Liu <liuj97@gmail.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>