PHYSTOP            64 kalloc.c         if((uint)v % PGSIZE || v < end || V2P(v) >= PHYSTOP)
PHYSTOP            35 main.c           kinit2(P2V(4*1024*1024), P2V(PHYSTOP)); // must come after startothers()
PHYSTOP           113 vm.c            { (void*)data,     V2P(data),     PHYSTOP,   PTE_W}, // kern data+memory
PHYSTOP           127 vm.c             if (P2V(PHYSTOP) > (void*)DEVSPACE)