aarch64_insn_decode_immediate
u64 aarch64_insn_decode_immediate(enum aarch64_insn_imm_type type, u32 insn);
sys_reg = (u32)aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn) << 5;
8 * aarch64_insn_decode_immediate(AARCH64_INSN_IMM_12,
imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_26, insn);
imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_19, insn);
imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_14, insn);
return aarch64_insn_decode_immediate(AARCH64_INSN_IMM_ADR, insn) << 12;