acpibat_get_object
static ACPI_OBJECT *acpibat_get_object(ACPI_HANDLE, const char *, uint32_t);
obj = acpibat_get_object(hdl, "_BIF", ACPIBAT_BIF_COUNT);
obj = acpibat_get_object(hdl, "_BST", ACPIBAT_BST_COUNT);