MIDR_IMPLEMENTER_MASK 110 kernel/arch/arm32/src/cpu/cpu.c cpu->imp_num = (ident >> MIDR_IMPLEMENTER_SHIFT) & MIDR_IMPLEMENTER_MASK; MIDR_IMPLEMENTER_MASK 81 kernel/arch/arm64/src/cpu/cpu.c (midr & MIDR_IMPLEMENTER_MASK) >> MIDR_IMPLEMENTER_SHIFT;HelenOS homepage, sources at GitHub