efi_find_handle
EFI_HANDLE efi_find_handle(struct devsw *, int);
h = efi_find_handle(&efinet_dev, i);
for (unit = 0, h = efi_find_handle(&efinet_dev, 0);
h != NULL; h = efi_find_handle(&efinet_dev, ++unit)) {
for (unit = 0, h = efi_find_handle(&efipart_dev, 0);
h != NULL; h = efi_find_handle(&efipart_dev, ++unit)) {
h = efi_find_handle(&efipart_dev, dev->d_kind.efidisk.unit);