G8l: yield context-save writer-authority audit

pub const S298_WRITER_BOUNDARY_SITES: usize = 1;
pub const S298_WRITER_AUTHORITY_SITES: usize = 0;
pub const S298_DIRECT_SCHEDULER_ACCESS_SITES: usize = S297_DIRECT_SCHEDULER_ACCESS_SITES;
pub const S298_IMMUTABLE_READ_SITES: usize = S297_IMMUTABLE_READ_SITES;
pub const S298_WHOLE_SCHEDULER_GUARDED_SITES: usize = S297_WHOLE_SCHEDULER_GUARDED_SITES;
pub const S298_WHOLE_SCHEDULER_UNROUTED_SITES: usize = S297_WHOLE_SCHEDULER_UNROUTED_SITES;
pub const S298_OPEN_WRITER_SITES: usize = S297_OPEN_WRITER_SITES;

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum G8lS298SchedulerWriterAuthorityAuditOutcome {
    Idle,
    AwaitingWriterAuthority {
        request_id: u64,
        guarded_sites: usize,
        writer_sites: usize,
    },
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum G8lS298SchedulerWriterAuthorityAuditError {
    S297(G8lS297SchedulerWriterAuthorityAuditError),
    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_s298_scheduler_writer_authority(
    caller_cpu: usize,
    request: Option<G8lS245WholeSchedulerExclusionAdmissionRequestView>,
) -> Result<G8lS298SchedulerWriterAuthorityAuditOutcome, G8lS298SchedulerWriterAuthorityAuditError>
{
    match preflight_s297_scheduler_writer_authority(caller_cpu, request)
        .map_err(G8lS298SchedulerWriterAuthorityAuditError::S297)?
    {
        G8lS297SchedulerWriterAuthorityAuditOutcome::Idle => {
            Ok(G8lS298SchedulerWriterAuthorityAuditOutcome::Idle)
        }
        G8lS297SchedulerWriterAuthorityAuditOutcome::AwaitingWriterAuthority {
            request_id,
            guarded_sites,
            writer_sites,
        } if guarded_sites == S298_WHOLE_SCHEDULER_GUARDED_SITES
            && writer_sites == S298_OPEN_WRITER_SITES =>
        {
            Ok(
                G8lS298SchedulerWriterAuthorityAuditOutcome::AwaitingWriterAuthority {
                    request_id,
                    guarded_sites,
                    writer_sites,
                },
            )
        }
        G8lS297SchedulerWriterAuthorityAuditOutcome::AwaitingWriterAuthority {
            guarded_sites,
            writer_sites: _,
            ..
        } => Err(
            G8lS298SchedulerWriterAuthorityAuditError::PriorCoverageDrift {
                guarded_sites,
                unrouted_sites: S298_DIRECT_SCHEDULER_ACCESS_SITES - guarded_sites,
            },
        ),
    }
}

#[test]
fn s298_keeps_yield_context_save_writer_open_until_exclusive_authority_exists() {
    assert_eq!(S298_WRITER_BOUNDARY_SITES, 1);
    assert_eq!(S298_WRITER_AUTHORITY_SITES, 0);
    assert_eq!(S298_DIRECT_SCHEDULER_ACCESS_SITES, 113);
    assert_eq!(S298_IMMUTABLE_READ_SITES, 44);
    assert_eq!(S298_WHOLE_SCHEDULER_GUARDED_SITES, 44);
    assert_eq!(S298_WHOLE_SCHEDULER_UNROUTED_SITES, 69);
    assert_eq!(S298_OPEN_WRITER_SITES, 69);
}

  {
    id: "g8l-s298-yield-context-save-writer-authority-audit-partial",
    date: "2026-08-26",
    sequence: 298,
    status: "passed",
    umbrella_status: "partial",
    title: "G8l: yield context-save writer-authority audit",
    summary:
      "S298 focused 15/15 PASS ile save_user_context_for_yield içindeki tek explicit mutable scheduler aliasını kaynakta doğrular. Current task varsa is_user, user_sp, ELR, SPSR, x0–x29 ve LR slot 30 exact sırada kaydedilir; current task yoksa yol no-op kalır. Sibling save_user_context_for_ipc_block writer'ı ayrıca açık tutulur. 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: [
      "S298 focused kaynak/model kapısı iki bağımsız koşuda 15/15 PASS verdi: 130 B / SHA-256 0447f2fe9dc6fdf30815a6962cf23d978425e51bef2acde1efb27e5da13a78b3.",
      "save_user_context_for_yield içindeki tek addr_of_mut!(SCHEDULER) writer boundary'si audit edilir. Conditional current_task borrow, is_user=true, user_sp, saved_user_elr, saved_user_spsr, saved_user_gprs[..30] copy ve saved_user_gprs[30]=ctx.lr sırası kaynakta görünür; no-current yolunda else/mutation yoktur ve sibling IPC-block writer ayrı kalır.",
      "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.",
      "S297 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 / 9b0adca9, RPi4 149371 B / 625004b4, RPi5 407516 B / fbf24557 ve RPi5+SMP 407458 B / 3832b38b. Warning header'ları sırasıyla 291, 389, 835 ve 835'tir; zero-warning iddiası değildir.",
      "Birleşik board-rpi5,board-qemu özellikleri iki koşuda beklenen exit 101, 18590 B / 43626efc, 17 error ve 22 warning header ile fail-closed kaldı; S298 writer boundary'si iki board profilinin birlikte etkinleşmesini açmaz.",
      "S238–S298 dependency matrisi iki koşuda 62 grup / 854/854 PASS; ham loglar 7982 B / ea4c126ef23e8189 ve 5068cc91d0f2801c, süre-normalize özetler byte-equal 8106 B / 0152431030b180016f804030195f08fae8e7a4975abd51f30f7bf9a46e39779d. Bu production writer-authority invocation kanıtı değildir.",
      "Ortak make verify-qemu iki koşuda PASS verdi: 116222 B / 19dc29ce ve 116139 B / 81e11d89; 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 S298 production writer invocation kanıtı değildir.",
      "Exact yedi tarihsel G8h assertion adıyla dışlandığında workspace iki koşuda 260 sonuç grubu / 2642 PASS / 7 filtered verdi: ham loglar 61280 B / 03ac4bc4 ve 3a4b71d0, süre-normalize 25101 B özet byte-equal / SHA-256 937a517e05309207c92dcfa1f2b6c2698683cf70fda72d26aa1f61a52c51fdf2. Filtresiz koşu exit 101, 56502 B / d41e08a0 ile frozen S96 exceptions.S identity kapısında RED kaldı; full-workspace GREEN iddia edilmez.",
      "S298 production exclusive wrapper, provider authority, whole-scheduler exclusion, QEMU runtime fixture veya scheduler mutation iddiası eklemez; physical/device operations=0 ve RUNBOOK_EXECUTED_IN_S298=NO.",
    ],
    commands: [
      "cargo test --quiet -p aselsan_microkernel_simulation --test g8l_target_dispatch_scheduler_owner_scheduler_mutation_production_migration_lifecycle_s298_yield_context_save_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-s298-yield-context-save-writer-authority-audit",
        title: "G8l S298 yield context-save writer-authority audit",
        commandLines: [
          "cargo test --quiet -p aselsan_microkernel_simulation --test g8l_target_dispatch_scheduler_owner_scheduler_mutation_production_migration_lifecycle_s298_yield_context_save_writer_authority_audit -- --test-threads=1",
        ],
        outputLines: [
          "test result: ok; S298 focused 1 group / 15 passed; 0 failed",
          "repeat-stable quiet output: 130 B / 0447f2fe9dc6fdf30815a6962cf23d978425e51bef2acde1efb27e5da13a78b3",
          "yield context-save writer authority remains model-only: reader blocks exclusive lease; conditional user/SP/ELR/SPSR/x0-x29/LR snapshot ordering is source-audited while the sibling IPC-block writer and 69 production writer sites remain open",
          "dependency: S238–S298 · 62 groups · 854/854 PASS; workspace: 260 groups · 2642 PASS · 7 historical filtered",
        ],
        exitCode: 0,
        outputMode: "selected",
      },
    ],
    terminalSessionsNote:
      "S298 kaynak/model fail-closed authority boundary'sidir; production writer guard/migration, QEMU fixture mutation ve fiziksel/device execution claim edilmez.",
    limitations: [
      "S298 yalnız save_user_context_for_yield içindeki tek explicit mutable scheduler aliasını audit eder; sibling save_user_context_for_ipc_block writer'ı 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–S298 dependency matrisi exact 62 grup / 854/854 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; S298 physical/device operations=0 ve RUNBOOK_EXECUTED_IN_S298=NO.",
    ],
  },