pmap_ste
ste = &Sysptmap[ste - pmap_ste(pmap_kernel(), 0)];
: (*pmap_ste(m, v) & SG_V))
#define pmap_ste_v(m, v) (*pmap_ste(m, v) & SG_V)
ste = pmap_ste(pmap, va);
int ix = pmap_ste(pmap, va) - pmap_ste(pmap, 0);