ef93a4fa14
Source changes (dormant parity infra, retained from iterate 2.AI/2.AO): - xenia-kernel/exports.rs: nt_create_event manual_reset polarity + related event wiring - xenia-gpu/mmio_region.rs: D1MODE_VBLANK_VLINE_STATUS hardcode parity Also lands the audit-runs/ analysis notes (.md/.txt/.json digests) for the iterate 2.x VSync/0x10e8/0x1004 wedge investigation. Raw trace dumps (.jsonl/.gz/.csv/.stdout) and agent worktrees (.claude/) are gitignored as regenerable local artifacts — see memory + HANDOFF for the running findings. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
62 lines
2.6 KiB
Markdown
62 lines
2.6 KiB
Markdown
# Phase C+23 broad-impact assessment (2026-05-18)
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## Resolved
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- **D-NEW-2 (C+17 catalog)** — KeWait timeout `wait.begin.timeout_ns`
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on canary tid=12 → ours tid=7 idx=3. Was 429466729600 (broken
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positive sign-extension); now -30000000 matching canary exactly.
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Sister chain advances 3 → 4.
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## Advanced
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- **`addis` opcode semantics across the entire CPU interpreter**.
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Any place in any guest binary using `lis`/`addis` with a negative
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immediate that flows into a 64-bit `std`, `mr`, `orx`, or anything
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else that propagates the full GPR value will now produce
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canary-equivalent behavior. The KeWait timeout was just the first
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observable symptom in Sylpheed's cold-vs-cold trajectory.
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## Persisted (no change)
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- Main matched-prefix tid=6→1 = **104,607** (the C+22 scheduler-
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determinism asymmetry is unaffected by this fix).
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- Sister chains tid=4→11 (11), tid=7→2 (32), tid=14→9 (41),
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tid=15→10 (16).
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- Phase B `image_canonical_sha256 = ea8d160e9369328a5b922258a92113ef
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b8d7ce3e1a5c12cc521e375985c91c18`.
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- Kernel tests 204 (unchanged — no kernel-side code change).
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## NEW
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- **D-NEW-2.1 (idx=4 sister chain canary tid=12 → ours tid=7)**:
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`KeWaitForSingleObject` return value canary=258 (TIMEOUT) vs
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ours=0 (SUCCESS). Same C+20/C+22 family — scheduler-determinism;
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ours's monolithic-thread runner allows the wait to return
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SUCCESS where canary's contended scheduler lets the 30 ms timeout
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elapse with no signaler. Out of scope for this phase; same
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parallel scheduler-determinism track recommended in C+22.
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- **CPU correctness probe**: opportunity for a low-key audit of
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every "32-bit ABI defensive truncation" in
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`xenia-cpu/src/interpreter.rs` for other ops that legitimately
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need 64-bit sign-extension at the producer rather than truncation.
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Quick mental scan suggests `addis` was likely the only such case;
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`addi` already extends via `simm16 as i64 as u64`, `ori`/`oris`
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are pure 64-bit OR. Not a blocking concern.
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## Test count delta
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| crate | pre-C+23 | post-C+23 | delta |
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|---------------|----------|-----------|-------|
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| xenia-cpu | 288 | 291 | +3 |
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| xenia-kernel | 204 | 204 | 0 |
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## Cold-stable digest delta
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| baseline | pre-C+23 | post-C+23 |
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|------------------------|-----------------------------------|-----------------------------------|
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| ours-cold det-fields | e1dfcb1559f987b35012a7f2dc6d93f5 | 23cf4c4cbf61a577caa4118ab2308ba6 |
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| Phase B image_canonical| ea8d160e9369… | ea8d160e9369… (UNCHANGED) |
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3× ours-cold runs all yield the new digest. Determinism preserved.
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