G8l: scheduler-tick writer-authority audit

pub const S295_WRITER_BOUNDARY_SITES: usize = 1;
pub const S295_WRITER_AUTHORITY_SITES: usize = 0;
pub const S295_DIRECT_SCHEDULER_ACCESS_SITES: usize = S294_DIRECT_SCHEDULER_ACCESS_SITES;
pub const S295_IMMUTABLE_READ_SITES: usize = S294_IMMUTABLE_READ_SITES;
pub const S295_WHOLE_SCHEDULER_GUARDED_SITES: usize = S294_WHOLE_SCHEDULER_GUARDED_SITES;
pub const S295_WHOLE_SCHEDULER_UNROUTED_SITES: usize = S294_WHOLE_SCHEDULER_UNROUTED_SITES;
pub const S295_OPEN_WRITER_SITES: usize = S294_OPEN_WRITER_SITES;

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum G8lS295SchedulerWriterAuthorityAuditOutcome {
    Idle,
    AwaitingWriterAuthority {
        request_id: u64,
        guarded_sites: usize,
        writer_sites: usize,
    },
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum G8lS295SchedulerWriterAuthorityAuditError {
    S294(G8lS294SchedulerWriterAuthorityAuditError),
    S245(G8lS245ExclusionAdmissionRequestError),
    PriorCoverageDrift {
        guarded_sites: usize,
        unrouted_sites: usize,
    },
}

/// Revalidate the prior fail-closed authority boundary without taking
/// admission or constructing a production exclusive wrapper.
pub fn preflight_s295_scheduler_writer_authority(
    caller_cpu: usize,
    request: Option<G8lS245WholeSchedulerExclusionAdmissionRequestView>,
) -> Result<G8lS295SchedulerWriterAuthorityAuditOutcome, G8lS295SchedulerWriterAuthorityAuditError>
{
    match preflight_s294_scheduler_writer_authority(caller_cpu, request)
        .map_err(G8lS295SchedulerWriterAuthorityAuditError::S294)?
    {
        G8lS294SchedulerWriterAuthorityAuditOutcome::Idle => {
            Ok(G8lS295SchedulerWriterAuthorityAuditOutcome::Idle)
        }
        G8lS294SchedulerWriterAuthorityAuditOutcome::AwaitingWriterAuthority {
            request_id,
            guarded_sites,
            writer_sites,
        } if guarded_sites == S295_WHOLE_SCHEDULER_GUARDED_SITES
            && writer_sites == S295_OPEN_WRITER_SITES =>
        {
            Ok(
                G8lS295SchedulerWriterAuthorityAuditOutcome::AwaitingWriterAuthority {
                    request_id,
                    guarded_sites,
                    writer_sites,
                },
            )
        }
        G8lS294SchedulerWriterAuthorityAuditOutcome::AwaitingWriterAuthority {
            guarded_sites,
            writer_sites: _,
            ..
        } => Err(
            G8lS295SchedulerWriterAuthorityAuditError::PriorCoverageDrift {
                guarded_sites,
                unrouted_sites: S295_DIRECT_SCHEDULER_ACCESS_SITES - guarded_sites,
            },
        ),
    }
}

#[test]
fn s295_keeps_scheduler_tick_writer_open_until_exclusive_authority_exists() {
    assert_eq!(S295_WRITER_BOUNDARY_SITES, 1);
    assert_eq!(S295_WRITER_AUTHORITY_SITES, 0);
    assert_eq!(S295_DIRECT_SCHEDULER_ACCESS_SITES, 113);
    assert_eq!(S295_IMMUTABLE_READ_SITES, 44);
    assert_eq!(S295_WHOLE_SCHEDULER_GUARDED_SITES, 44);
    assert_eq!(S295_WHOLE_SCHEDULER_UNROUTED_SITES, 69);
    assert_eq!(S295_OPEN_WRITER_SITES, 69);
}

  {
    id: "g8l-s295-scheduler-tick-writer-authority-audit-partial",
    date: "2026-08-26",
    sequence: 295,
    status: "passed",
    umbrella_status: "partial",
    title: "G8l: scheduler-tick writer-authority audit",
    summary:
      "S295 focused 15/15 PASS ile scheduler_tick içindeki tek explicit mutable scheduler aliasını kaynakta doğrular. Non-CPU0 delivery local timer'ı kapatıp alias öncesinde döner; CPU0 sched.tick() çağrısını yapar, yalnız preemption istendiğinde ayrıca açık kalan yield_now() writer'ına ilerler ve ardından framebuffer VSync sayacını yükseltir. Scheduler::tick time-slice, vruntime, aging ve preemption sözleşmesi exact kaynak token'larıyla korunur. Bu production migration değildir. Writer authority yalnız model gate'inin exclusive lease'iyle mümkündür, reader lease'i writer'ı açmaz. Production inventory 113 direct / 44 immutable guarded / 69 open writer olarak değişmez ve production exclusive wrapper, provider authority, whole-scheduler exclusion veya scheduler mutation üretilmez.",
    evidence: [
      "S295 focused kaynak/model kapısı iki bağımsız koşuda 15/15 PASS verdi: 130 B / SHA-256 0447f2fe9dc6fdf30815a6962cf23d978425e51bef2acde1efb27e5da13a78b3.",
      "scheduler_tick içindeki tek addr_of_mut!(SCHEDULER) writer boundary'si audit edilir. current_cpu_id() != 0 dalı local timer disable ve return ile alias öncesinde kapanır; CPU0 let sched mutable aliası, if sched.tick(), koşullu yield_now() ve framebuffer_advance_vsync() sırası kaynakta görünür. yield_now() ayrı açık writer boundary'sidir; S295 onu production authority altına almaz.",
      "Scheduler::tick forwardee'sinde AtomicU64 tick counter, her 50 tick'te aging, current task time_slice decrement, weight-temelli vruntime artışı ve time_slice sıfırlandığında preemption=true sözleşmesi exact kaynak token'larıyla doğrulanır.",
      "Model gate reader membership exclusive writer authority'yi ExclusiveBusy ile bloklar; reader bırakıldıktan sonra non-zero token'lı exclusive lease alınır. Bu host/model evidence'tır.",
      "S294 authority preflight yeniden doğrulanır; pending S245 request korunur ve sonuç AwaitingWriterAuthority { guarded_sites: 44, writer_sites: 69 } olarak döner.",
      "Dört AArch64 profil derlemesi iki koşuda byte-equal exit 0 verdi: QEMU 110646 B / b591db7b, RPi4 149371 B / ee5932eb, RPi5 402423 B / 56d300f2 ve RPi5+SMP 402365 B / 8ee42594. Warning header'ları sırasıyla 291, 389, 820 ve 820'dir; zero-warning iddiası değildir.",
      "Birleşik board-rpi5,board-qemu özellikleri iki koşuda beklenen exit 101, 18590 B / 969412f1, 17 error ve 22 warning header ile fail-closed kaldı; S295 writer boundary'si iki board profilinin birlikte etkinleşmesini açmaz.",
      "S238–S295 dependency matrisi iki koşuda 59 grup / 809/809 PASS; ham loglar 7592 B / 284eb34a ve 62659625, süre-normalize özet 7710 B byte-equal / c238ab7cc2c73c6d4751128ed4c0a82661e09b0963e39302bfa616d84cdb4a99. Bu production writer-authority invocation kanıtı değildir.",
      "Ortak make verify-qemu iki koşuda PASS verdi: 116222 B / 752e786e ve 116139 B / 1e3d1d71; W^X 31/31, S271 GRAPH_ABSENT=YES, RuntimePmm baseline, EL0 x4096, IPC 20/20, tek beklenen S142 fatal containment ve SEC5 korunur. Bu ortak smoke S295 production writer invocation kanıtı değildir.",
      "Exact yedi tarihsel G8h assertion adıyla dışlandığında workspace iki koşuda 257 sonuç grubu / 2594 PASS / 7 filtered verdi: ham loglar 60887 B / 9d0b544e ve 44803af8, süre-normalize 24810 B özet byte-equal / SHA-256 42e51b0c6303deeda5ef7819ac1a78e1f5578626797126f267d493df294ddb03. Filtresiz koşu exit 101, 56109 B / 91a46aa5 ile frozen S96 exceptions.S identity kapısında RED kaldı; full-workspace GREEN iddia edilmez.",
      "S295 production exclusive wrapper, provider authority, whole-scheduler exclusion, QEMU runtime fixture veya scheduler mutation iddiası eklemez; physical/device operations=0 ve RUNBOOK_EXECUTED_IN_S295=NO.",
    ],
    commands: [
      "cargo test --quiet -p aselsan_microkernel_simulation --test g8l_target_dispatch_scheduler_owner_scheduler_mutation_production_migration_lifecycle_s295_scheduler_tick_writer_authority_audit -- --test-threads=1",
      "cargo check --quiet -p aselsan_kernel --target aarch64-unknown-none --no-default-features --features board-qemu",
      "cargo check --quiet -p aselsan_kernel --target aarch64-unknown-none --no-default-features --features board-rpi4",
      "cargo check --quiet -p aselsan_kernel --target aarch64-unknown-none --no-default-features --features board-rpi5",
      "cargo check --quiet -p aselsan_kernel --target aarch64-unknown-none --no-default-features --features board-rpi5,smp",
      "cargo check --quiet -p aselsan_kernel --target aarch64-unknown-none --features board-rpi5",
      "make verify-qemu",
    ],
    terminalSessions: [
      {
        id: "g8l-s295-scheduler-tick-writer-authority-audit",
        title: "G8l S295 scheduler-tick writer-authority audit",
        commandLines: [
          "cargo test --quiet -p aselsan_microkernel_simulation --test g8l_target_dispatch_scheduler_owner_scheduler_mutation_production_migration_lifecycle_s295_scheduler_tick_writer_authority_audit -- --test-threads=1",
        ],
        outputLines: [
          "test result: ok; S295 focused 1 group / 15 passed; 0 failed",
          "repeat-stable quiet output: 130 B / 0447f2fe9dc6fdf30815a6962cf23d978425e51bef2acde1efb27e5da13a78b3",
          "scheduler-tick writer authority remains model-only: reader blocks exclusive lease; yield_now remains a separate open writer and 69 production writer sites remain open",
          "dependency: S238–S295 · 59 groups · 809/809 PASS; workspace: 257 groups · 2594 PASS · 7 historical filtered",
        ],
        exitCode: 0,
        outputMode: "selected",
      },
    ],
    terminalSessionsNote:
      "S295 kaynak/model fail-closed authority boundary'sidir; production writer guard/migration, QEMU fixture mutation ve fiziksel/device execution claim edilmez.",
    limitations: [
      "S295 yalnız scheduler_tick içindeki tek tick writer aliasını audit eder; koşullu yield_now() ayrı açık writer boundary'sidir ve toplam 69 production writer site açık kalır.",
      "Exclusive lease yalnız host/model gate'inde test edilir; production exclusive wrapper, provider authority ve whole-scheduler exclusion açık kalır.",
      "S238–S295 dependency matrisi exact 59 grup / 809/809 PASS'tir; bu production writer authority invocation kanıtı değildir.",
      "Filtresiz workspace frozen S96 identity kapısında RED'dir; workspace umbrella GREEN iddia edilmez.",
      "Supported-profile runtime invocation, Generic SMP ve fiziksel RPi kabulü açık kalır; S295 physical/device operations=0 ve RUNBOOK_EXECUTED_IN_S295=NO.",
    ],
  },