SG_ISHIFT
m->sg_ishift = SG_ISHIFT;
m->sg_ishift = SG_ISHIFT;
shift = SG_ISHIFT;
#define SG_IMASK ((~0U) << SG_ISHIFT)
>> (mmutype == MMU_68040 ? SG4_SHIFT1 : SG_ISHIFT)]))
#define pmap_ste(m, v) (&((m)->pm_stab[(vaddr_t)(v) >> SG_ISHIFT]))
m->sg_ishift = SG_ISHIFT;