HelenOS sources

CTR_CTYPE_MASK     91 boot/arch/arm32/include/arch/cp15.h 	CTR_CTYPE_MASK = 0x1e000000,
CTR_CTYPE_MASK     91 kernel/arch/arm32/include/arch/cp15.h 	CTR_CTYPE_MASK = 0x1e000000,
CTR_CTYPE_MASK     91 uspace/lib/c/arch/arm32/include/libarch/cp15.h 	CTR_CTYPE_MASK = 0x1e000000,
HelenOS homepage, sources at GitHub