atf_check_mstosbt
atf_check_mstosbt(0, 0);
atf_check_mstosbt(4294967, 1);
atf_check_mstosbt((1ll << 32) - 4294968, 999);
atf_check_mstosbt(1ll << 32, 1000);
atf_check_mstosbt((1ll << 33) - 4294968, 1999);
atf_check_mstosbt(1ll << 33, 2000);
atf_check_mstosbt((1ll << 34) - 4294968, 3999);
atf_check_mstosbt(1ll << 34, 4000);
atf_check_mstosbt(((1ll << 31) - 1) << 32, ((1ll << 31) - 1) * 1000);