HelenOS sources

MIDR_ARCHITECTURE_MASK   64 boot/arch/arm32/include/arch/cp15.h 	MIDR_ARCHITECTURE_MASK = 0xf,
MIDR_ARCHITECTURE_MASK   64 kernel/arch/arm32/include/arch/cp15.h 	MIDR_ARCHITECTURE_MASK = 0xf,
MIDR_ARCHITECTURE_MASK   64 uspace/lib/c/arch/arm32/include/libarch/cp15.h 	MIDR_ARCHITECTURE_MASK = 0xf,
HelenOS homepage, sources at GitHub