HelenOS sources

cr4                37 boot/arch/ppc32/include/arch/regname.h #define cr4  4
cr4                43 kernel/arch/ppc32/include/arch/asm/regname.h #define cr4  4
cr4                43 uspace/lib/c/arch/ppc32/include/libarch/regname.h #define	cr4	4
HelenOS homepage, sources at GitHub