uservtophys
waddr = (void *)(intptr_t)uservtophys((intptr_t)uptr);
if ((void *)(intptr_t)uservtophys((intptr_t)uptr) != waddr) {
waddr = (void *)(intptr_t)uservtophys((intptr_t)uptr);
vm_paddr_t uservtophys(vm_offset_t va);