MIDR_VARIANT_MASK 111 kernel/arch/arm32/src/cpu/cpu.c cpu->variant_num = (ident >> MIDR_VARIANT_SHIFT) & MIDR_VARIANT_MASK; MIDR_VARIANT_MASK 82 kernel/arch/arm64/src/cpu/cpu.c CPU->arch.variant = (midr & MIDR_VARIANT_MASK) >> MIDR_VARIANT_SHIFT;HelenOS homepage, sources at GitHub