HelenOS sources

PFERR_CODE_RW     172 kernel/arch/amd64/include/arch/mm/page.h #define PFERR_CODE_RW  (1 << 1)
PFERR_CODE_RW     158 kernel/arch/ia32/include/arch/mm/page.h #define PFERR_CODE_RW		(1 << 1)
HelenOS homepage, sources at GitHub