HelenOS sources

MMU_PAGE_WIDTH     44 kernel/arch/sparc64/include/arch/mm/page.h #define MMU_PAGE_WIDTH	MMU_FRAME_WIDTH
MMU_PAGE_WIDTH     40 kernel/arch/sparc64/include/arch/mm/sun4v/page.h #define MMU_PAGE_WIDTH	MMU_FRAME_WIDTH
HelenOS homepage, sources at GitHub