Claim: the task for 6.4b in two check-ins: (i) the guest's local APIC as x2APIC through intercepted MSRs, CPUID reporting x2APIC, VMCB injection behind one call (V_IRQ or EVENTINJ), the guest's APIC timer, and hlt as a wait; (ii) the 8259 pair and ELCR, the PIT with channel 2 through port 0x61, and the virtio console's INTx through the 8259. No IOAPIC, no HPET, no decoder. Passage: PLAN, What Linux sees, x86 guests' interrupts under choice A (decided Nov 11, 2026). Demonstration: the VMCB fields named are QEMU 11.1.2 target/i386/svm.h lines 9-10, 24-25 and 42-53. Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX Leaf check-in: 463e61cba4 user: x86-1-glint tags: trunk

Claim: What Linux sees now gives x86 guests the local APIC as x2APIC through MSRs, the 8259 and PIT on I/O ports, plain MSI later, and the TSC; no IOAPIC or HPET. The stakes note says decided, with the timer calibrated against the PIT and CPUID added only if 6.7b shows Linux needs it. The decision log records it. The Arm row says GICv3, as 6.1a decided. Passage: the maintainer, relayed in glint 5c447d1377: 'If Glint understands and finds the trade-offs reasonable, it may architect how it handles interrupts and access exceptions.' Demonstration: the design crosses neither the I/O-port decision nor adds a decoder: x2APIC accesses arrive as MSR exits with number and value, and the 8259 and PIT are port devices on 5.2's dispatcher. Size: about 20 lines in PLAN.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 124c7a5804 user: x86-1-glint tags: trunk

Claim: next to What Linux sees, PLAN records the open question about x86 guests' interrupts in plain words: the proposal (x2APIC through MSRs, the 8259 and PIT on ports, no IOAPIC or HPET), and what it costs or keeps for real PCs, one-CPU guests, several-CPU guests (MSI fits A; MSI-X doesn't), Linux's timer calibration, and changing course later. Unchecked points are marked. Passage: The One Place's relay of the maintainer's question, glint ca4e0e5caa: record the stakes in plain words next to the change, whatever the maintainer decides. Demonstration: each register claim is cited to QEMU 11.1.2 (hw/intc/ioapic.c, hw/intc/i8259.c, hw/timer/hpet.c, hw/virtio/virtio-pci.c); the chipset and Linux claims are marked unchecked. Size: 40 lines added to PLAN.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 8e7ac49ca9 user: x86-1-glint tags: trunk

Claim: the task for a Phase 2 addendum, 2.4c: on ACPI-only aarch64 firmware (UTM on a Mac), native mode takes its console from SPCR, its GIC from MADT and its timer interrupt from GTDT; with a devicetree nothing changes. Tested with a second U-Boot built from qemu_arm64_acpi_defconfig. Slotted before 6.6 because the maintainer is using the UTM disk now. Passage: the maintainer's finding, relayed in glint 396ebb66f3: native answers 'console not found' under UTM. Demonstration: QEMU 11.1.2 hw/arm/virt-acpi-build.c:765 builds an SPCR for virt's PL011; U-Boot 2026.07 has configs/qemu_arm64_acpi_defconfig. Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 50a185fe39 user: x86-1-glint tags: trunk

Claim: the boots page gains 6.5a (ii) part 2: the guest's UEFI firmware loads and starts an EFI application, which finds the devicetree and its load options. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge 14ce9dcac0's tree, built inside BQ2's seed; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: bcf1a57610 user: x86-1-glint tags: trunk

Reviewed against docs/tasks/6.5a-ii-split.md part 2b; verdict merge. Glint places the application's file at 0x40800000 and names it in /chosen/glint,efi-app; the firmware loads it at 0x40400000 with 2a's shared PE loader, installs one loaded-image protocol whose callbacks compare the handle with the one installed before touching it, passes /chosen/bootargs as UCS-2 load options, and calls it. The application has an all-BSS .data and needs no workaround. In the release build the firmware's largest function is 1,752 bytes and guest_efi_main 152. 353 changed non-spec lines with the README: over the ~250 aim, under the 400 stop. Codex ran, after the last change, the aarch64 boot suite in BQ2's seed (39 examples) and the x86_64 one (31), 0 failures each, and the host suite (1,423, 0 failures). The reviewer booted it in the seed: 'efi app: started', 'efi app: devicetree found', 'efi app: load options "console=ttyAMA0"', 'VM: guest powered off'; exit 0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 14ce9dcac0 user: x86-1-glint tags: trunk

Passage: MOS4/5 section 7.2, paraphrase because the text is absent: a virtual machine should present the behavior software expects from hardware. UEFI 2.10's system-table and loaded-image interface is shared through boot/efi.cr; U-Boot 2026.07 include/efi_api.h and lib/efi_loader/efi_boottime.c supply the local ABI/GUID and handle/open reference. Linux libstub compatibility remains unverified until 6.7a.

Demonstration: In BQ2's seed, crystal spec spec/run --example aarch64: 39 examples, 0 failures/errors/pending after the final change; firmware/app targeted boots: 6 examples, 0 failures; image/header checks filtered to aarch64: 2 examples, 0 failures; host/loader/small-target checks: 17 examples, 0 failures; source-initializer check: 1 example, 0 failures. Outside it, crystal spec spec/run --example x86_64: 31 examples, 0 failures/errors/pending; full crystal spec with ZEPHYR_SRC and LD_LIBRARY_PATH=/usr/lib64: 1423 examples, 0 failures/errors, 62 pending. crystal tool format --check passes. The app prints "efi app: started", "efi app: devicetree found", "efi app: load options \"console=ttyAMA0\"", then "VM: guest powered off" (52 KiB backed). Entry objdump shows relative BL to guest_efi_main at 0x126c. Firmware/app have no ELF relocations. The source initializer checker now understands compile-time annotations while still rejecting executable module statements. All aarch64 builds/runs used BQ2's seed; x86 builds/runs were outside it. Required full boot suites ran serially.

Size: 300 additions, 53 removals outside specs/fixtures, 353 changed lines including 75 README additions/removals; net +247. Above the approximate 250-line target, below the 400-line stop. Both maintained Glint PE sizes unchanged: aarch64 275456 bytes, x86_64 258560 bytes. Firmware remains 20992 bytes; new app 8704 bytes. llvm-nm on release firmware: largest GuestEFI.application 1752 bytes, Fdt.walk 1072, install 812, load 700, guest_efi_main 152; all below 2048. App main 532. Maintained Glint's largest pre-existing Matcher.result stays 8404 bytes Arm / 11410 x86; no new/increased function exceeds 2048 in those builds. An optional full Glint --release link fails on undefined memmove from unchanged NativeTable.build; no successful linked release Glint is claimed. The requested external report records this and execution/search qualifications. Leaf check-in: bcac3a9d7f user: x86-1-glint tags: slice/6.5a-ii-2b

Reviewed against docs/tasks/6.5a-ii-split.md part 2a; verdict merge. A section with no raw data now gets PointerToRawData 0 (efi.lds computes it; crt0.S writes it), as the PE format specifies. Linking the same objects with the old and new header gives byte-identical results for all nine maintained images, so only all-BSS guests change; 3.6's parser is unchanged and its spec now covers both header shapes. boot/pe_loader.cr holds the section copy and DIR64 relocation that GuestSpace#load did, over caller-supplied memory, for the guest firmware to share in 2b. 196 changed non-spec lines, 87 of them removals; net +22. Codex ran, after the last change, the aarch64 boot suite in BQ2's seed (38 examples) and the x86_64 one outside it (31), 0 failures each, the full host suite (1,419 examples, 0 failures), and the format check.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 935da91f88 user: x86-1-glint tags: trunk

Passage: xv6 section 3.7, as quoted in docs/tasks/3.6b.md: "A program section header's filesz may be less than the memsz, indicating that the gap between them should be filled with zeroes (for C global variables) rather than read from the file." MOS4/5 section 7.2, paraphrased because its text is absent: a virtual machine should present the behavior software expects from hardware. Shared placement keeps the firmware's future loader subject to the same rules as Glint.

Demonstration: In the seed: crystal spec spec/run --example aarch64: 38 examples, 0 failures/errors/pending; the targeted PE/header/placement specs: 487 examples, 0 failures/errors/pending. Image, startup-initialization and small-target checks pass. Outside the seed with ZEPHYR_SRC: crystal spec: 1419 examples, 0 failures/errors, 62 pending; crystal spec spec/run --example x86_64: 31 examples, 0 failures/errors/pending; corresponding targeted specs: 487 examples, 0 failures/errors/pending. Boots ran serially, Arm then x86. crystal tool format --check passes. Controlled header-only old/new links all cmp=0; final maintained guests also all cmp=0 against those controls. Pre-existing stale artifacts are distinguished in build/6.5a-ii-2a/report-draft.md and the requested external report.

Size: 109 added, 87 removed outside spec/ (196 changed lines). Both Glint images remain the same size: aarch64 275456 bytes; x86_64 258560 bytes. Header-only controlled rebuilds: cmp=0 for both Glint images and all seven maintained guests. Largest new function: PeLoader.load, 864 bytes aarch64 and 866 bytes x86_64; no new/increased function exceeds 2048 bytes. Existing larger functions are unchanged. Leaf check-in: 5e529df3d8 user: x86-1-glint tags: slice/6.5a-ii-2a

Claim: Part 2's first run stopped under rule 3 at 402 lines without starting the application. It found finding 2's cause: crt0.S writes .data's PointerToRawData as its RVA even when SizeOfRawData is 0, past the end of an all-BSS guest's file, so 3.6's parser rightly refuses it. 2a fixes the header (PointerToRawData 0 for a section with no raw data, Glint's images byte-identical) and extracts the PE loader for the firmware to share; 2b starts the application on it, with the loaded-image handle checked by identity and guest_efi_main kept under 2 KiB in the release build. Passage: PLAN rule 3. Demonstration: the draft and its report are kept in the scratchpad and named in the task. Size: 38 lines added to one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 95d24e123e user: x86-1-glint tags: trunk

Claim: the boots page gains 6.5a (ii) part 1: a UEFI firmware runs as Glint's guest and prints through its own console. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge b9f1011561's tree, built inside BQ2's seed; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 89950edf77 user: x86-1-glint tags: trunk

Reviewed against docs/tasks/6.5a-ii-split.md part 1; verdict merge. guest/efi is a freestanding EL1 image built exactly as the test guest is, from Phase 1's EFI definitions: a system table with CRC32'd headers, ConOut over the PL011 with 4.5's filter, ConIn not ready, the devicetree in the configuration table, every other boot service EFI_UNSUPPORTED. The first attempt's fault at 0x200 came from compiler-generated SIMD with EL1 FP/SIMD disabled; the entry now sets CPACR_EL1.FPEN, and the image has no relocations. 278 changed non-spec lines with prose: over the ~200 aim, under the 400 stop. After the merge, in BQ2's seed, the aarch64 boot suite gives 38 examples, 0 failures, and the firmware prints 'guest firmware: system table ok, devicetree in configuration table' then powers off; outside it the x86_64 boot suite passes and format passes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: b9f1011561 user: x86-1-glint tags: trunk

Claim: spec/run/virtio_console_spec.cr and spec/run/xhci_spec.cr expected 'test guest: devicetree 1445 bytes'; the reviewer's PSCI fix (cb450c2b1c) added 'arm,psci' to the psci node and the tree became 1453 bytes. The reviewer merged that fix after booting the guest but without rerunning these two boot specs, so trunk at b50aa7262e failed them. Codex found it while doing 6.5a (ii) part 1 and left the expectations alone. Passage: rule 2's demonstration: a merge is shown by its specs. Demonstration: inside BQ2's seed, crystal spec spec/run --example aarch64: 34 examples, 0 failures. Size: 2 lines in 2 specs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: bc9e11cfa8 user: x86-1-glint tags: trunk

Claim: On aarch64, Glint loads a standalone guest firmware with the existing --guest path and passes its devicetree in x0. The firmware builds EFI-shaped system and boot tables from boot/efi.cr, exposes the tree by EFI_FDT_GUID, prints through its own PL011 ConOut, reports ConIn not ready, refuses all boot services, and powers off through PSCI. Only Part 1 is implemented.

Passage: MOS4/5 section 7.2, paraphrase (text absent from the workspace): a virtual machine should present the behavior software expects from hardware. UEFI 2.10 sections 4.2-4.4 and 12.3-12.4 supply the tables and console ABI; U-Boot 2026.07 include/efi_api.h supplies EFI_FDT_GUID. The firmware remains an ordinary EL1 guest: UART accesses trap as device accesses, and PSCI is its only hypercall. No Linux libstub call sequence is assumed or verified.

Demonstration: Every aarch64 command uses docs/tasks/4.1a.md's BQ2 seed namespace and environment, with cd /workspace/v54, through build/6.5a-ii-1-seed.sh. bin/glint-build guest-efi aarch64 and glint-build aarch64 pass. bin/glint-run aarch64 --mode hypervisor --guest build/aarch64/guest/efi.efi --expect "VM: guest powered off" prints "guest firmware: system table ok, devicetree in configuration table", then shutdown and 32 KiB backing. The build shares build_test_guest's header, Crystal flags and shared/Bsymbolic boot/efi.lds link. llvm-objdump shows _start at 0x1000 with a relative BL at 0x1018 to guest_efi_main at 0x118c; placement at 0x40200000 therefore calls 0x4020118c. Fixed caller-owned storage avoids module GOT relocations (llvm-readelf -r: none). Entry enables CPACR_EL1.FPEN before Crystal's SIMD struct zeroing; a relative entry alone still reproduced the 0x200 exception-vector fetch symptom before this.

In the seed: crystal spec spec/run --example aarch64: 38 examples, 2 failures, 0 errors/pending. Both failures are unchanged baseline 1445-byte FDT expectations in virtio_console_spec and xhci_spec; trunk's PSCI fix cb450c2b1c produces 1453 bytes, as merge b50aa7262e records. Guest code, tree and those expectations are unchanged. Final spec/run/guest_efi_spec.cr: 2 pass. spec/guest_efi_spec.cr: 3 pass. image_initialization_spec.cr filtered by aarch64: 1 pass; source initializer check: 1 pass. efi_image_spec.cr filtered by aarch64: 1 pass. small_target_spec.cr: 1 pass. No x86_64 target is built in the seed: architecture examples are selectable and the run harness builds only its selected architecture.

Outside the seed, ZEPHYR_SRC=/workspace/src/zephyr-src crystal spec: 1406 examples, 0 failures/errors, 62 expected pending; LD_LIBRARY_PATH points to a local symlink to BQ2 seed libxml2.so.2, missing on this host. With QEMU_SRC, UBOOT_SRC and GLINT_UBOOT_BUILD_DIR=build/uboot, crystal spec spec/run --example x86_64: 31 examples, 0 failures, 0 errors, 0 pending. Boot suites run serially. crystal tool format --check passes. No Python or new heap/startup initializer.

Size: 273 added, 5 removed non-spec lines, including prose (278 changed; above the approximately 200-line aim, below the 400-line stop). Glint EFI bytes before -> after: aarch64 275456 -> 275456; x86_64 258560 -> 258560. Firmware EFI: 20992 bytes, SizeOfImage 24576. Largest new function: GuestEFI.boot_services, 1488 bytes; build is 744. All firmware text functions are <= 2048 bytes. Existing Glint code is unchanged; its existing largest text functions, Shell::Matcher.result, remain 8404/11410 bytes on Arm/x86. The all-aarch64-boot-pass constraint remains unmet only for the two baseline FDT expectations above. Part 2 was not started. Full report: /tmp/claude-1000/-workspace-tree/a0ae0c06-f036-4a7e-a6d5-e2cc56695fb6/scratchpad/6.5a-ii-1-report.md Leaf check-in: 9a5dc2dd02 user: x86-1-glint tags: slice/6.5a-ii-1

Claim: the first run of 6.5a-ii stopped under rule 3 at 411 lines with part (a) failing and nothing committed. This splits it: (1) the firmware stands up as Glint's guest and prints through its own ConOut, (2) it loads and starts an EFI application, (3) memory, ExitBootServices and runtime services, unchanged. It records the run's five findings: the firmware faulted on its first fetch at 0x200 (link address, not placement), the test app's PE was refused by 3.6's parser, a 2,976-byte function, x86_64 built inside the seed through a spec require, and a hand-counted spec length. Passage: PLAN rule 3, stop past about 400 non-spec lines and split. Demonstration: the first run's report and boot log are kept in the scratchpad and named in the task. Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 762a214500 user: x86-1-glint tags: trunk

Claim: the task for 6.5a (ii), in two check-ins: (a) a guest-resident firmware (guest/efi/) built from Phase 1's protocol definitions that loads an EFI application and serves ConOut over the PL011, a configuration table with 6.5a (i)'s devicetree, and the loaded-image protocol; (b) the memory map, page and pool allocation, ExitBootServices, and honest runtime services, enough for an application shaped like Linux's EFI stub. Passage: docs/phases/06-interrupts-drivers.md, slice 6.5; PLAN, What Linux sees. Demonstration: the task names a test EFI application whose lines show each service, and specs for the tables and the memory map. Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 875a8b736e user: x86-1-glint tags: trunk

Claim: the boots page gains 6.5a (i): Glint writes a devicetree for the guest, and the guest walks it. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge b50aa7262e's tree, built inside BQ2's seed; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 89693d3778 user: x86-1-glint tags: trunk

Reviewed against docs/tasks/6.5a.md; verdict merge, after one review fix (cb450c2b1c: the PSCI node says 0.2, matching PSCI_VERSION). An allocation-free FDT writer and the guest's 12-node tree: RAM, one CPU with PSCI over hvc, GICv3, the virtual timer, PL011, virtio-mmio, xHCI and chosen, placed at 0x40ffe000 with its address in x0. Cleave::Fdt reads it back on the host; the report lists every difference from QEMU's virt tree and why. 339 changed source lines plus 46 of prose: over the ~300 aim, under the 400 stop. Existing functions over 2 KiB (Fdt.open 2,052 on aarch64, NativeTable.locate 2,078 on x86_64) were already over and aren't enlarged. The reviewer booted the guest in BQ2's seed: 'test guest: devicetree 1453 bytes, 12 nodes' among its lines, 'VM: guest memory 36 KiB backed' (the tree adds one page); exit 0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: b50aa7262e user: x86-1-glint tags: trunk

Claim: the guest devicetree's psci node is compatible with 'arm,psci-0.2' and 'arm,psci', not 'arm,psci-1.0'. Glint's PSCI_VERSION returns 0x2 (4.4), and QEMU writes this pair for a PSCI 0.2 implementation. The reviewer's task said psci-1.0; Codex followed it and flagged the mismatch. Passage: QEMU 11.1.2 hw/arm/boot.c:403-408, fdt_add_psci_node. Demonstration: spec/guest_fdt_spec.cr reads 'arm,psci-0.2' back with Cleave::Fdt: 6 examples, 0 failures. Format passes. Size: 1 line in boot/guest_fdt.cr, 2 in docs/guest-devicetree.md, 1 in the spec.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX Leaf check-in: cb450c2b1c user: x86-1-glint tags: slice/6.5a-i

Claim: Glint writes a 1445-byte, 12-node devicetree describing its Arm guest RAM, CPU/PSCI, GICv3, timer, PL011/clock, virtio-mmio, xHCI and chosen. The allocation-free caller-buffer writer deduplicates names and reports exhaustion without overrunning storage. Shared constants supply registered apertures. Hypervisor entry passes the translated tree at 0x40ffe000 in x0; the guest walks it and prints its size and node count after the timer line.

Passage: Hailperin section 7.5, paraphrase (text absent from the workspace): a virtual machine is defined by the machine its guest is shown. DTSpec v0.4 chapter 5's v17 structure is implemented against Cleave::Fdt and Glint::Fdt; QEMU 11.1.2 virt.c/boot.c and U-Boot upstream bindings supply the binding values (docs/guest-devicetree.md). The task's required arm,psci-1.0 string is retained, while 4.4's VERSION still returns 0.2: this mismatch is explicit, and this slice does not silently change that ABI or implement full PSCI 1.0.

Demonstration: all aarch64 commands use docs/tasks/4.1a.md's BQ2 seed namespace/environment with cd /workspace/v54, via build/6.5a-seed.sh. bin/glint-build aarch64 && bin/glint-build test-guest aarch64 crystal run build/6.1a-dump.cr crystal spec spec/run --example aarch64 34 examples pass, zero pending, after the final creation guard change. crystal spec spec/run/pl011_spec.cr spec/run/timer_spec.cr --example aarch64 4 examples pass after the backing assertion update; timer passes unedited. crystal spec spec/run/glint_run_spec.cr --example "fails a wrong expected line" 1 example passes (unlabelled Arm boot). crystal spec spec/guest_fdt_spec.cr spec/fdt_spec.cr spec/image_initialization_spec.cr spec/small_target_spec.cr 17 examples pass, no pending; initializer checks cover both images. crystal spec spec/efi_image_spec.cr --example aarch64 1 example passes. Outside the seed, with ZEPHYR_SRC, QEMU_SRC, UBOOT_SRC and GLINT_UBOOT_BUILD_DIR=build/uboot: crystal spec spec/run --example x86_64 31 examples pass, no pending; x86 boot assertions unedited. Outside with ZEPHYR_SRC, QEMU_SRC/UBOOT_SRC unset, and LD_LIBRARY_PATH pointing to build/6.5a-libs (BQ2 seed libxml2.so.2 only): crystal spec 1402 examples, 0 failures, 0 errors, 61 expected pending. crystal tool format --check passes. Boot suites run sequentially. Guest prints devicetree 1445 bytes, 12 nodes; 36 KiB backing is seven image pages plus one stack and one tree page. The QEMU dump comparison checks binding values, not bytes, and explains machine differences. No Python or new startup initializer is introduced.

Size: non-spec 378 added, 7 removed (385 total including prose; source alone 332 added, 7 removed, above the approximate 300-line aim but below 400). EFI bytes before -> after: aarch64 263168 -> 275456; x86_64 258560 -> 258560, identical SHA-256. Largest new function is FdtWriter.finish, 1440 bytes; guest tree walker 1276; existing Vcpu.serve_devices stays 2044. Existing Fdt.open (2052) and x86 NativeTable.locate (2078) already exceed 2 KiB, and are unchanged; no new function or threshold crossing is added. check-in: 6d3478e236 user: x86-1-glint tags: slice/6.5a-i

Claim: the task for 6.5a (i): an allocation-free FDT writer and the guest's tree (RAM, one CPU with PSCI over hvc, GICv3, the virtual timer, PL011, virtio-mmio, xHCI, chosen), placed at the top of guest RAM with its address in x0, read back on the host with Cleave::Fdt and at run time by the test guest. (ii), the guest's EFI environment, follows in its own task. Passage: docs/phases/06-interrupts-drivers.md, slice 6.5. Demonstration: the task names its oracle (Cleave::Fdt and 2.4a's reader) and the boot that shows it. Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: c968e9b3a9 user: x86-1-glint tags: trunk

Claim: the boots page gains 6.4a: the guest takes a virtio interrupt and a timer interrupt through its own virtual GIC. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge ad8bd3d14f's tree, built inside BQ2's seed; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 88ad8145df user: x86-1-glint tags: trunk

Reviewed against docs/tasks/6.4a.md; verdict merge, after a review-fix check-in (2243398456): the timer line's spec accepts 10-20 ms, since QEMU under load measured 11 ms; and Vcpu.boot, pushed to 2,616 bytes, is split so no Vcpu function exceeds 2 KiB (largest now serve_devices, 2,044 bytes on aarch64, close to the limit). The guest gets an emulated GICv3 distributor and redistributor; Glint injects through list registers; virtio-mmio raises INTID 48; the guest's wfi waits for an interrupt; the virtual timer's PPI 27 is linked to the guest through the list register's hardware bit, so the guest's EOI deactivates the physical interrupt. (i) is 394 changed non-spec lines, at the 400 stop; (ii) 170. The reviewer booted the guest in BQ2's seed: seven guest lines in order, including 'virtio interrupt 48 received' and 'timer interrupt 27 after 10 ms', then 'VM: guest memory 32 KiB backed'; exit 0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: ad8bd3d14f user: x86-1-glint tags: trunk

Claim: The Arm boot specs accept only integer measured timer times from 10 through 20 ms, with a comment explaining QEMU scheduling under load. All other expected lines remain exact and ordered; the guest still prints measured milliseconds. Vcpu.boot separates CPU creation/freeing, stack-owned device setup/serving and Arm GIC registration without changing guest behavior, registration order or device lifetimes. Every emitted function from boot/vcpu.cr is below 2 KiB on both architectures.

Passage: docs/tasks/6.4a.md review fixes and docs/phases/06-interrupts-drivers.md slice 6.4a; Hailperin 7.5.2, paraphrased because its text is absent: the hypervisor delivers interrupts through the guest's ordinary hardware interface. This preserves that interface and the existing timer implementation; only the measured-time assertion and host function boundaries change.

Demonstration: In docs/tasks/4.1a.md's exact BQ2 seed namespace/environment, with cd /workspace/v54: bin/glint-build aarch64 succeeds; crystal spec spec/run --example aarch64: 34 examples, zero failures/errors/pending. crystal spec spec/vgic_spec.cr spec/virtio_mmio_spec.cr spec/gic_spec.cr spec/image_initialization_spec.cr spec/efi_image_spec.cr spec/small_target_spec.cr: 22 examples, zero failures/errors/pending. Then outside the seed, with ZEPHYR_SRC=/workspace/src/zephyr-src QEMU_SRC=/workspace/src/qemu-11.1.2 UBOOT_SRC=/workspace/src/u-boot-2026.07 GLINT_UBOOT_BUILD_DIR=build/uboot LD_LIBRARY_PATH=/workspace/seed/rootfs/usr/lib64: bin/glint-build x86_64 succeeds; crystal spec spec/run --example x86_64: 31 examples, zero failures/errors/pending. The boot suites ran sequentially. Outside the seed with ZEPHYR_SRC set and QEMU_SRC/UBOOT_SRC unset, crystal spec: 1396 examples, zero failures/errors, 61 pending for unavailable architecture/source tools. crystal tool format --check passes. Multiline regex boundary checks accept exactly 10..20 and reject prefix/suffix text. No Python used.

Size: 53 inserted, 45 deleted non-spec lines; only boot/vcpu.cr and the two boot specs changed. llvm-nm -S --size-sort -C build/aarch64/glint.so (inside seed): Vcpu.boot 0x118 = 280 bytes, serve_devices 0x7fc = 2044, register_gic 0x19c = 412. Same command for build/x86_64/glint.so outside seed: boot 0x401 = 1025 bytes, serve_devices 0x736 = 1846; no Arm helper emitted. All 30 Arm and 26 x86 Vcpu symbols checked: maxima 2044/1846 bytes, none over 2048. EFI sizes unchanged: Arm 263168 -> 263168 bytes; x86 258560 -> 258560 bytes. No heap or startup initializers added; image and small-target checks pass.

Signed-off-by: Codex <noreply@openai.com> Leaf check-in: 2243398456 user: x86-1-glint tags: slice/6.4a

Claim: The Arm guest programs CNTV_CVAL/CTL directly, sleeps with WFI, takes virtual INTID 27 in its EL1 vector and prints its CNTVCT-measured 10 ms interval. It rearms and receives the same timer twice, proving the physical interrupt can deliver again after the guest's EOI. All earlier lines, console input during guest execution and EL1 refusal remain.

Passage: docs/phases/06-interrupts-drivers.md, slice 6.4a; Hailperin 7.5.2, paraphrase because the text is absent: the hypervisor delivers an interrupt through the guest's ordinary hardware interface. QEMU 11.1.2 bsa.h:30, gicv3_internal.h:173,244-254 and cpuif.c:1480-1493 supply PPI 27, EOImode, LR.HW and pINTID. Host EOI only drops physical priority; the guest's EOI deactivates the linked physical interrupt. This avoids altering its timer mask or trapping its accesses. helper.c:1180-1255,1583-1590,1624-1644, 1745-1749 supplies access controls, absolute deadlines and timer enable. CNTHCTL_EL2=0 permits EL1 virtual timer/counter accesses with HCR.E2H=0; CNTVOFF_EL2=0 suffices for one guest on the continuous physical timebase.

Demonstration: In docs/tasks/4.1a.md's BQ2 namespace with cd /workspace/v54, bin/glint-build aarch64; crystal spec spec/run --example aarch64: 34/34 pass. crystal spec spec/vgic_spec.cr spec/virtio_mmio_spec.cr spec/gic_spec.cr spec/image_initialization_spec.cr spec/efi_image_spec.cr spec/small_target_spec.cr: 22/22 pass. All three guest-output specs print 'test guest: timer interrupt 27 after 10 ms', after the existing lines and virtio IRQ 48; 32 KiB backed. The IRQ handler samples CNTVCT; the guest prints integer milliseconds from the actual counter delta and CNTFRQ. Empty pending-queue refill scans are skipped to avoid delaying wakeup. Outside the seed, crystal spec spec/run --example x86_64: 31/31 pass. With ZEPHYR_SRC set and QEMU_SRC/UBOOT_SRC unset, crystal spec: 1396 examples, zero failures/errors, 61 pending for unavailable architecture/source tools. Outside LD_LIBRARY_PATH uses BQ2 seed libraries for libxml2.so.2. crystal tool format --check passes. Final boot suites run sequentially; no other checkout was accessed and no Python was used.

Size: 161 inserted, 9 deleted non-spec lines (170 total including README; 149 implementation lines). Both EFI files unchanged: Arm 263168 -> 263168, x86 258560 -> 258560 bytes. Arm guest PE 20992 -> 25088 bytes; seven loaded image pages plus one stack page back 32 KiB. Largest new function this check-in: TestGuest.timer, 288 bytes. The task's largest new function remains Vgic#write at 1744 bytes. Modified existing Vcpu.boot is 2616 bytes. No new heap or initializers; both image and Cortex-M0+ checks pass.

Signed-off-by: Codex <noreply@openai.com> check-in: 547aa8a4b5 user: x86-1-glint tags: slice/6.4a

Claim: The Arm guest configures emulated distributor/redistributor registers, receives INTID 48 through its EL1 vector and hardware virtual CPU interface, acknowledges virtio and ends the interrupt. Disabled sources stay pending; LR overflow requests underflow maintenance. WFI waits with host IRQs enabled. The existing guest lines and x86 behavior remain.

Passage: docs/phases/06-interrupts-drivers.md, slice 6.4a; Hailperin 7.5.2, paraphrase because the text is absent: the hypervisor delivers interrupts through the guest's hardware interface, leaving its driver independent. QEMU 11.1.2 gicv3_internal.h:31-159,202-258, cpuif.c:391-430, virt.c:180,188,271 and bsa.h:28 supply the cited register layouts, addresses and interrupt IDs.

Demonstration: In docs/tasks/4.1a.md's BQ2 namespace with cd /workspace/v54, bin/glint-build aarch64; crystal spec spec/run --example aarch64: 34/34 pass. crystal spec spec/vgic_spec.cr spec/virtio_mmio_spec.cr spec/image_initialization_spec.cr spec/efi_image_spec.cr spec/small_target_spec.cr: 16/16 pass. The guest prints 'test guest: virtio interrupt 48 received', then xHCI and shutdown, with 28 KiB backed; typing during execution and EL1 refusal pass. Outside the seed, crystal spec spec/run --example x86_64: 31/31 pass. With ZEPHYR_SRC set and QEMU_SRC/UBOOT_SRC unset, crystal spec: 1395 examples, zero failures/errors, 61 pending for unavailable architecture/source tools. Outside LD_LIBRARY_PATH uses BQ2 seed libraries for the absent libxml2.so.2. crystal tool format --check passes. An initial outside full run briefly overlapped the seed suite's QEMU runs; it was stopped and rerun sequentially. The overlapping Cortex-M fixtures used no ESP. No other checkout was accessed.

Size: 376 inserted, 18 deleted non-spec lines (394 total, including README), above the approximate 300 target but below 400. Arm EFI 250880 -> 263168 bytes; x86 EFI 258560 -> 258560 bytes. Largest new function: Vgic#write, 1744 bytes. The modified existing Vcpu.boot is 2596 bytes. No new heap or initializers; both image checks and the Cortex-M0+ size check pass.

Signed-off-by: Codex <noreply@openai.com> check-in: a907137b47 user: x86-1-glint tags: slice/6.4a

Claim: the task for 6.4a in two check-ins: (i) an emulated GICv3 distributor and redistributor for the guest, list-register injection through one call, virtio-mmio raising INTID 48, wfi as a wait for an interrupt, and the test guest taking the interrupt through its own vector; (ii) the guest's virtual timer on PPI 27. Passage: docs/phases/06-interrupts-drivers.md, slice 6.4a; Hailperin 7.5.2. Demonstration: the values named are cited to QEMU 11.1.2: gicv3_internal.h:202-222 (ICH_VMCR_EL2, ICH_HCR_EL2), virt.c:271 (virtio-mmio interrupts from SPI 16). Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: a3bf5562eb user: x86-1-glint tags: trunk

Claim: the boots page gains 6.3: Zephyr's PL011 driver runs interrupt-driven, and the console command counts one receive interrupt per key. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge 4e310cdb5c's tree, built inside BQ2's seed; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: be20685691 user: x86-1-glint tags: trunk

Reviewed against docs/tasks/6.3.md; verdict merge. 6.3a: the devicetree generator emits interrupt cells, UART_INTERRUPT_DRIVEN is set, the shim gains IRQ_CONNECT and irq_enable, an arm64 ISR table is generated from .intList in Crystal, the console provider fills a receive ring from the driver's callback, the shell idles between keys, and a physical IRQ during a guest exits to Glint and the guest resumes. 6.3b: COM1's IRQ 4 through the IOAPIC, and SVM's INTR intercept with V_INTR_MASKING. Zephyr's sources are unedited. 6.3a is over the ~250 target at 354 changed lines, under the 400 stop; 6.3b is 105. The runner now spaces scripted keys by 10 ms so each key is its own interrupt. The reviewer booted: aarch64 in the seed, cat then console, 'console: interrupt-driven, 24 receive interrupts' (16 + 8 keys); x86_64, console, 8; the x86_64 phase 4 guest still powers off.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 4e310cdb5c user: x86-1-glint tags: trunk

Claim: Zephyr's unmodified NS16550 connects COM1 IRQ 4 dynamically to vector 0x54 through the IOAPIC, 6.1b's table and Trap.dispatch. Both architectures now consume the receive ring and idle with IRQs unmasked. SVM intercepts physical INTR, using host IF so a guest masking its own IRQs cannot block Glint's console; the run loop services it through the normal dispatcher and resumes the guest. Host IRQs do not consume the guest exit limit. Output remains synchronous on uart_poll_out.

Passage: xv6 sections 6.1-6.2, paraphrased because the text was not found: the interrupt handler buffers console input for its reader, while output can wait for transmitter readiness. MOS4/5 sections 5.2.2-5.2.4 describe the polling-to-interrupt step. docs/console-interrupts.md cites Zephyr's Intel64 dynamic connection and QEMU's VMCB INTR bit 0, exit code 0x60, V_INTR_MASKING bit 24 and host-IF handling by name and line.

Demonstration: /tmp/glint-6.3/seed is the exact BQ2 namespace command from docs/tasks/4.1a.md with cd /workspace/v54 and its specified environment. /tmp/glint-6.3/seed crystal spec spec/run --example aarch64: 34 pass. /tmp/glint-6.3/seed crystal spec spec/run/glint_run_spec.cr:105 spec/run/glint_run_spec.cr:115: 2 pass. /tmp/glint-6.3/seed crystal spec spec/zephyr --example aarch64: 16 pass. /tmp/glint-6.3/seed crystal spec spec/image_initialization_spec.cr spec/efi_image_spec.cr spec/pe_image_spec.cr spec/small_target_spec.cr: 961 pass, including both images' no-initializer check. Small target: 29846 flash bytes and 52 static RAM bytes. /tmp/glint-6.3/outside crystal spec spec/vcpu_spec.cr spec/zephyr/interrupt_spec.cr: 7 pass, including the packed VMCB offsets, INTR intercept/masking bits and exit decoder, ring and recorded ISR table. The polling-only host shared library now supplies trapping IRQ controller hooks: it resolves production-wrapper symbols but fails if privileged setup is attempted. Its console spec passes, with both unchanged child suites at 11 examples and zero failures/errors; the affected mode, native-table and preload host suites also pass (22 examples). /tmp/glint-6.3/outside crystal spec spec/run --example x86_64: 31 pass. Arm EL2/EL1 and x86 shell boots show "console: interrupt-driven, 8 receive interrupts". Keys during each guest also produce that line after "VM: guest powered off" (20 KiB backed on Arm, 44 KiB on x86). LD_LIBRARY_PATH=/usr/lib64 ZEPHYR_SRC=/workspace/src/zephyr-src crystal spec: 1390 examples, 0 failures/errors, 61 pending (unavailable targets/boot env; architecture boots were separately enabled above). crystal tool format --check: pass.

Size: 85 non-spec lines added, 20 removed (105 changed, including source notes), below the approximately 400-line stop. Both images before/after: aarch64 250880/250880 bytes; x86_64 258560/258560 bytes. Largest new image function in this half: glint_irq_route, 390 bytes on x86. The largest new image function across both check-ins remains Arm arch_irq_enable, 600 bytes; no new image function exceeds 2 KiB. No new heap allocation or startup initializer and no edits to upstream Zephyr. The earlier read-only search-boundary violation and the first half's approximate size-target deviation are recorded in the requested report; no additional constraint was left unmet.

Co-Authored-By: OpenAI Codex <noreply@openai.com> Signed-off-by: OpenAI Codex <noreply@openai.com> Leaf check-in: b8181d5c01 user: x86-1-glint tags: slice/6.3

Claim: Zephyr's unmodified PL011 fills a fixed 256-byte receive ring in its interrupt callback. The shell consumes it with IRQs masked and idles with IRQs unmasked between keys; the timer stays stopped outside sleep. A guest physical IRQ exits through vector 9, reaches Trap.dispatch and resumes the guest. Crystal generates ISR adapters from the documented .intList records. The DT/Kconfig/console seam is shared; x86 controller connection and input remain staged for 6.3b. Output stays synchronous on uart_poll_out.

Passage: xv6 sections 6.1-6.2, paraphrased because the text was not found in the workspace: the interrupt handler buffers console input for its reader, while output can wait synchronously for transmitter readiness. Phase 6's MOS4/5 sections 5.2.2-5.2.4 describe the polling-to-interrupt step. Sources and exact Zephyr/QEMU names and lines are in docs/console-interrupts.md.

Demonstration: /tmp/glint-6.3/seed is the BQ2 namespace command from docs/tasks/4.1a.md with cd /workspace/v54 and its specified environment. /tmp/glint-6.3/seed crystal spec spec/run --example aarch64: 34 pass. /tmp/glint-6.3/seed crystal spec spec/run/glint_run_spec.cr:105 spec/run/glint_run_spec.cr:115: 2 pass. /tmp/glint-6.3/seed crystal spec spec/zephyr --example aarch64: 16 pass. /tmp/glint-6.3/seed crystal spec spec/image_initialization_spec.cr spec/efi_image_spec.cr spec/pe_image_spec.cr spec/small_target_spec.cr: 961 pass; no image initializers; small target 29846 flash / 52 static RAM. Outside: /tmp/glint-6.3/outside crystal spec spec/run --example x86_64: 29 pass. EL2, EL1 and the guest-input Arm boots each show "console: interrupt-driven, 8 receive interrupts"; the guest powers off. LD_LIBRARY_PATH=/usr/lib64 ZEPHYR_SRC=/workspace/src/zephyr-src crystal spec: 1389 examples, 0 failures/errors, 60 pending (unavailable targets/boot env; architecture boots were run separately above). New ring/ISR/EL2/GIC host specs in the seed: 10 pass. crystal tool format --check: pass.

Size: 340 non-spec lines added, 14 removed (354 changed, including source notes), above the approximate 250-line target and below the 400-line stop. Images before/after: aarch64 246784/250880 bytes; x86_64 254464/258560 bytes. Largest new image function: Arm arch_irq_enable 600 bytes; x86 newly linked uart_ns16550_fifo_read 171 bytes (Glint's ring push is 144). No new image function exceeds 2 KiB. No upstream Zephyr edits or new heap allocations. Constraint not met: an early broad find /workspace -maxdepth 2 search could enumerate entries under the two forbidden directories; disclosed to the maintainer and recorded in the requested report. No intentional file reads or edits in those directories.

Co-Authored-By: OpenAI Codex <noreply@openai.com> Signed-off-by: OpenAI Codex <noreply@openai.com> check-in: 61af7c1dfe user: x86-1-glint tags: slice/6.3

Claim: the task for 6.3, split as the slice allows: 6.3a extends Track Z's devicetree generator with interrupt cells, sets UART_INTERRUPT_DRIVEN, adds IRQ_CONNECT and irq_enable to the shim, a receive ring to the console provider, a generated arm64 ISR table, and the guest's physical-IRQ exit; 6.3b connects COM1's IRQ 4 through the IOAPIC and intercepts physical interrupts during SVM guests. Passage: docs/phases/06-interrupts-drivers.md, slice 6.3; Z-zephyr-seam.md, What Track Z leaves. Demonstration: the task names its oracle (Zephyr's headers and drivers compiling with -Werror in interrupt mode) and boots on both machines. Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: e105bf0a79 user: x86-1-glint tags: trunk

Claim: the boots page gains 6.2 on x86_64: Glint calibrates the local APIC timer and sleeps two seconds on its tick. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge 884ee87288's tree; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 6ddc6690b1 user: x86-1-glint tags: trunk

Reviewed against docs/tasks/6.2.md; verdict merge. A 100 Hz tick through 6.1's controllers: the generic timer on aarch64 (EL2 physical at EL2, EL1 physical at EL1, CNTFRQ 1 GHz on QEMU), and the local APIC timer on x86_64, calibrated against the ACPI PM timer at about 996 MHz. The tick runs only during sleep, so guests are unaffected until 6.4. 312 changed non-spec lines with documentation: over the ~250 target, under the 400 stop. The reviewer ran sleep then cat: aarch64 in the seed exited 0; x86_64 printed 'Timer: local APIC, 995884398 Hz counter, 100 Hz tick' and 'sleep: 2 s, 200 ticks (counter agrees)', then the file; exit 0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 884ee87288 user: x86-1-glint tags: trunk

Claim: Timer.start/stop/ticks drive the generic physical timer at EL2 or EL1 and the local APIC timer through the existing controller tables and trap dispatcher. sleep 1..10 idles between ticks, stops before returning, and checks the elapsed count against CNTPCT or the ACPI PM counter. APIC frequency is calibrated once from firmware's PM port, including wraps.

Passage: xv6 6.4, Timer interrupts (text not present locally; paraphrase): periodic timer interrupts let the kernel count time, and the handler schedules the next interrupt. Hailperin 2.5 supplies the later preemption motivation; MOS4/5 5.5 discusses clocks. docs/phases/06-interrupts-drivers.md 6.2 is the specification. docs/timer.md and inline citations name QEMU 11.1.2's timer registers, PPIs, APIC mode/divisor and FADT PM counter.

Demonstration: inside BQ2's seed, with the environment in docs/tasks/4.1a.md and cd /workspace/v54: bin/glint-build aarch64; crystal spec spec/run --example aarch64: 31 examples, no failures/errors/pending. Serialized wrong-expected-line and FAT16 harness checks each pass. Timer boots at EL2 and EL1 each print 1000000000 Hz and sleep: 1 s, 100 ticks (counter agrees). crystal spec spec/timer_spec.cr spec/image_initialization_spec.cr spec/efi_image_spec.cr spec/pe_image_spec.cr spec/small_target_spec.cr: 964 examples pass. Outside, with the source paths set, crystal spec spec/run --example x86_64: 29 examples pass; local APIC measures 996044495 Hz and sleep counts 100 ticks with counter agreement. LD_LIBRARY_PATH=/usr/lib64 ZEPHYR_SRC=/workspace/src/zephyr-src crystal spec: 1386 examples, 0 failures, 0 errors, 59 expected unavailable-target/source pending. crystal tool format --check passes. Initial overlapping Arm harness execution shared the ESP and failed a mode assertion; a loaded timer measured 102 counter ticks. The complete serialized rerun passed without changing existing specs.

Size: 311 added and 1 removed non-spec lines (312 changed), above the approximate 250-line target and below 400. Specs add 63 lines. EFI image bytes before -> after: aarch64 238592 -> 246784; x86_64 250368 -> 254464. Largest new function: Fdt#compatible_property on Arm, 1988 bytes (<2048). No new heap allocation or startup initializer; image and small checks pass. Leaf check-in: a4f82d95d1 user: x86-1-glint tags: slice/6.2

Claim: the task for 6.2: a 100 Hz tick through 6.1's controllers on both machines, the generic timer on aarch64 (EL2 or EL1 physical) and the local APIC timer on x86_64, calibrated against the ACPI PM timer; a sleep command that counts ticks and checks them against a free-running counter. Passage: docs/phases/06-interrupts-drivers.md, slice 6.2; xv6 6.4. Demonstration: the timer PPIs are QEMU 11.1.2 include/hw/arm/bsa.h:29-33 (EL2 physical 26, EL1 physical 30); the PM timer's place is hw/i386/acpi-build.c:183. Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: e57176dfad user: x86-1-glint tags: trunk

Claim: the boots page gains 6.1b: Glint brings up the local APIC and IOAPIC and handles two interrupts it sends itself. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge 8bcd78097c's tree; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 531c5f6a2f user: x86-1-glint tags: trunk

Reviewed against docs/tasks/6.1b.md; verdict merge. Glint finds both controllers in the recorded-and-reproducible q35 MADT, masks the 8259s, enables the xAPIC with every LVT entry masked, masks all 24 IOAPIC entries (N from the IOAPIC's version register), and takes vectors 0x20-0xff through 4.1's dispatcher on IST1, which keeps the compiler's red zone safe. 338 changed non-spec lines: over the ~250 target, under the 400 stop. The reviewer booted interrupt twice then cat outside the seed: the APIC line, two 'Interrupt: vector 0x41 handled' / 'interrupt: resumed' pairs, the file; exit 0. aarch64 unchanged in the seed (29 boot examples, per Codex).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 8bcd78097c user: x86-1-glint tags: trunk

Claim: Native x86_64 finds the enabled CPU and first IOAPIC in the checked ACPI MADT, checks IA32_APIC_BASE, maps the controller pages as devices, masks both PICs, all LVTs and IOAPIC entries, and software-enables xAPIC. Vectors 32-255 use the existing dispatcher and iretq; handlers precede EOI, spurious vector 255 gets none, and unhandled vectors are reported once. The interrupt command alone enables IF, handles vector 0x41, disables IF, and resumes. IRQs use IST1 to preserve the compiler's red zone. Arm's path and all existing boot tests are unchanged (only interrupt_spec's x86 block changes).

Passage: MOS4/5 section 5.1.5, Interrupts Revisited. The full text is not available in this checkout; paraphrase: save interrupted execution, dispatch the interrupt handler, acknowledge completion and restore execution so the interrupted work continues. QEMU 11.1.2 is the register-layout authority, cited beside the code; its EPYC FEAT_1_ECX lacks x2APIC.

Demonstration: Outside the seed: crystal spec spec/apic_spec.cr spec/acpi_spec.cr spec/gic_spec.cr 19 examples, no failures/errors/pending. ZEPHYR_SRC=/workspace/src/zephyr-src LD_LIBRARY_PATH=/usr/lib64 crystal spec 1381 examples, 0 failures, 0 errors, 57 pending ZEPHYR_SRC=/workspace/src/zephyr-src QEMU_SRC=/workspace/src/qemu-11.1.2 UBOOT_SRC=/workspace/src/u-boot-2026.07 crystal spec spec/run --example x86_64 28 examples, no failures/errors/pending. The interrupt example sends twice, sees both handled/resumed pairs and reads hello.txt. crystal run tools/record_madt.cr Repeats the recorded 120-byte q35 MADT byte-for-byte; SHA256 730d87a32397365641ca2c58beb3832119c66813e98774fb482571f08668143c. Boot reports local 0xfee00000 id 0, IOAPIC 0xfec00000, 24 lines. N = version register maximum redirection index 23 + 1, matching QEMU include/hw/intc/ioapic.h IOAPIC_NUM_PINS=24. crystal tool format --check Passes. Inside the exact 4.1a seed namespace, with cd /workspace/v54: bq2 sysroot-namespace --rootfs=/workspace/seed/rootfs --bind=/workspace:/workspace -- /bin/sh -c 'cd /workspace/v54 && export ZEPHYR_SRC=/workspace/src/zephyr-src QEMU_SRC=/workspace/src/qemu-11.1.2 UBOOT_SRC=/workspace/src/u-boot-2026.07 HOME=/workspace/seed/home GLINT_UBOOT_BUILD_DIR=build/uboot GLINT_QEMU_AARCH64=build/qemu-aarch64/qemu-system-aarch64 LD_LIBRARY_PATH=/usr/lib64 && bin/glint-build aarch64 && crystal spec spec/run --example aarch64' 29 examples, no failures/errors/pending. With the same namespace/export prefix: crystal spec spec/image_initialization_spec.cr spec/small_target_spec.cr spec/apic_spec.cr spec/acpi_spec.cr spec/gic_spec.cr 25 examples, no failures/errors/pending; both linked images have no startup initializers; Cortex-M0+ checks pass. crystal spec spec/efi_image_spec.cr spec/pe_image_spec.cr spec/elf_dialect_spec.cr --example aarch64 478 examples, no failures/errors/pending. crystal spec spec/run/glint_run_spec.cr --example "fails a wrong expected line" crystal spec spec/run/glint_run_spec.cr --example "writes a FAT16 ESP" One example each, both pass. Builder calls for x86 in shared image checks use the current image; x86 compilation was outside the seed.

Size: +319/-19 non-spec lines, 338 changed, net +300 (including comments and blanks; excludes specs and fixtures). Above the approximate 250-line aim, below the 400-line stop bound. Largest new image function: Apic.controllers, 1832 bytes by llvm-nm --print-size --size-sort --radix=d. EFI image bytes before -> after: aarch64 238592 -> 238592; x86_64 238080 -> 250368. No other constraint unmet; BQ2 tools only, no Python, no startup initializers or heap use in the new interrupt path. Leaf check-in: 6b60e4b5f3 user: x86-1-glint tags: slice/6.1b

Claim: the task for 6.1b, 6.1a's twin on x86_64: Glint finds the local APIC and IOAPIC in the ACPI MADT, masks the 8259 PICs, enables the local APIC, and takes a self-IPI on vector 0x41 through 4.1's dispatcher, with the same command and lines as on aarch64. Passage: docs/phases/06-interrupts-drivers.md, slice 6.1b. Demonstration: QEMU 11.1.2's EPYC model lists no x2APIC in FEAT_1_ECX (target/i386/cpu.c), so the task uses the memory-mapped xAPIC; IO_APIC_DEFAULT_ADDRESS is 0xfec00000 (include/hw/intc/ioapic.h:24). Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 8a1d10ca22 user: x86-1-glint tags: trunk

Claim: the boots page gains 6.1a: Glint brings up the GICv3 and handles an interrupt it sends itself. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge bf54a5e614's tree, built inside BQ2's seed; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 495de6d2eb user: x86-1-glint tags: trunk

Reviewed against docs/tasks/6.1a.md; verdict merge. Glint finds the arm,gic-v3 node, wakes this CPU's redistributor, enables the system-register CPU interface, and takes IRQs through 4.1's dispatcher: acknowledge, handle, end of interrupt, eret. N = 288 lines from GICD_TYPER (QEMU's 256 external plus 32). Every aarch64 boot now runs with gic-version=3 and passes unchanged in BQ2's seed (29 examples, per Codex); the recorded devicetree Track Z generates from (compat/zephyr/dts/qemu-virt.dtb) was re-recorded with GICv3, and the bindings spec reproduces it byte for byte. Over the ~250-line target at 368 changed non-spec lines, under the 400-line stop. The reviewer booted 'interrupt' then 'cat' in the seed: 'GIC: v3 at 0x8000000, 288 lines', 'Interrupt: SGI 1 handled', 'interrupt: resumed', the file; exit 0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: bf54a5e614 user: x86-1-glint tags: trunk

Claim: Native aarch64 finds the firmware's GICv3, selects this CPU's redistributor, initializes Group 1 and the system-register CPU interface, and handles current-EL IRQs through the shared trap dispatcher and eret. The fixed handler table skips special IDs, and reports, ends and disables unhandled interrupts. Interrupts stay masked and all IDs disabled except SGI 1 during the interrupt command. Both EL2 and EL1 resume and read a file afterwards. The x86_64 command prints its specified deferred message. Runner requests gic-version=3 with and without virtualization.

Passage: MOS4/5 section 5.1.5, Interrupts Revisited. The textbook text is not present in the checkout; paraphrase: a controller mediates device requests to the CPU, which acknowledges, services and ends the selected interrupt before continuing. QEMU 11.1.2 hw/intc/gicv3_internal.h, arm_gicv3_dist.c, arm_gicv3_redist.c, arm_gicv3_cpuif.c and hw/arm/virt.c supply the register and devicetree values; source lines are cited in the implementation and report. N=288 comes from GICD_TYPER: virt.c sets 256 external lines plus 32 SGIs/PPIs.

Demonstration: all aarch64 builds and boots in BQ2's seed using the exact namespace/environment from docs/tasks/4.1a.md with cd /workspace/v54. crystal spec spec/run --example aarch64: 29 passed. Outside the seed, crystal spec spec/run --example x86_64: 28 passed. Existing boot specs were not edited. Seed image_initialization_spec, efi_image_spec, small_target_spec and gic_spec: 13 passed; gic_spec plus Zephyr's bindings and recorded-DTB reproduction: 13 passed. Direct interrupt followed by cat hello.txt at EL2 and EL1 prints the GIC line, SGI handled, resumed and the file. Repeated SGIs pass at both ELs. Full outside crystal spec with ZEPHYR_SRC set and QEMU_SRC/UBOOT_SRC unset: 1376 examples, 0 failures, 0 errors, 57 pending. crystal tool format --check passes. No image startup initializers or allocation in the new code. Largest new function is Fdt#compatible_reg, 1976 bytes; all new functions fit 2 KiB.

Size: +365/-3 non-spec textual lines, 368 changed, net +362, plus the recorded 7875-byte GICv3 DTB. aarch64 image 230400 -> 238592 bytes; x86_64 image 238080 -> 238080 bytes. This exceeds the approximate 250-line target but remains below the approximate 400-line stop limit.

Deviations: an initial filtered outside x86_64 run's existing ensure_built invoked glint-build all while the Arm image was stale, attempting an Arm build outside the seed; clang rejected the unavailable target. That run was stopped; final runs used current images and the required environments. A read-only textbook filename search used find /workspace -maxdepth 2 without pruning the excluded checkouts, potentially enumerating entries there. No files in /workspace/tree or /workspace/s8a were opened for contents or modified. The report records these and the size overrun.

Co-Authored-By: Codex <noreply@openai.com> Signed-off-by: Codex <noreply@openai.com> Leaf check-in: d7f9f9ea3b user: x86-1-glint tags: slice/6.1a

Claim: Phase 6 is refined (rule 9): the order of its slices, with Track U's U.2-U.5 after 6.7b (Linux on both machines) and before the Zephyr slices 6.8-6.10; GICv3 on Arm, since the Beagle SoCs carry it and QEMU's virt would otherwise pick GICv2; each slice's passage; and open question 1 to be asked when 6.7b lands. PLAN's status section, stale since Phase 3, now says Phases 1-5 are done and Phase 6 is current. docs/tasks/6.1a.md is the first Phase 6 task: Glint finds the GICv3 in the devicetree, brings up its distributor, redistributor and system-register CPU interface, and takes a self-sent SGI through 4.1's dispatcher. Passage: PLAN rule 9, 'Later phases list provisional slices that are refined, and given their quotations, when the phase starts.' Demonstration: QEMU 11.1.2 hw/arm/virt.c:2624-2634 picks GICv2 by default; U-Boot 2026.07 k3-am62-main.dtsi and k3-am62p-j722s-common-main.dtsi say arm,gic-v3; the project's QEMU has CONFIG_ARM_GICV3, and virt,virtualization=on,gic-version=3 starts. Size: about 30 lines in the Phase 6 document, 10 in PLAN.md, 6 in U-usb.md, and one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 36f6a2f548 user: x86-1-glint tags: trunk

Claim: the boots page gains U.1: the guest reads an emulated xHCI controller's capabilities, stops and resets it, and prints what it found. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at slice/U.1 305ddb9fd1 (merged as d1ece77c05), built inside BQ2's seed; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: 48f6f63c40 user: x86-1-glint tags: trunk

Reviewed against docs/tasks/U.1.md; verdict merge. HCSPARAMS1 0x04000108 gives 4 ports, 1 interrupter, 8 slots; ports follow QEMU's numbering, USB 3 first. The reviewer booted the demo in BQ2's seed: the guest reads the capabilities, stops and resets the controller, and prints 'test guest: xHCI 1.0, 4 ports, 8 slots' after its other lines; 'VM: guest memory 24 KiB backed'; exit 0. x86_64 unchanged (27 boot examples pass outside the seed, per Codex).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: d1ece77c05 user: x86-1-glint tags: trunk

Claim: In aarch64 hypervisor mode the guest finds an xHCI 1.0 controller at 0x0c000000, reads 8 slots, 1 interrupter and 4 ports, stops and resets it, then prints its readings after the existing virtio line. Capability, protocol, operational, port, runtime and doorbell registers implement U.1's reset values and writable masks. Unsupported widths and alignment reach the existing fault report. There are no rings, transfers or interrupts yet. x86_64 retains its device layout, I/O behavior and guest output.

Passage: xv6 section 6, a driver "configures the device hardware"; here Glint is the device. docs/phases/U-usb.md U.1 and docs/tasks/U.1.md specify the register-only slice. Sources: QEMU 11.1.2 hw/usb/hcd-xhci.c:47-54,2640-2670,2710-2808,2924-3173,3188-3194; include/hw/usb/xhci.h:17; hw/arm/virt.c:216. QEMU's protocol list is USB2 then USB3, while USB3 ports are numbered first.

Demonstration: bq2 sysroot-namespace --rootfs=/workspace/seed/rootfs --bind=/workspace:/workspace -- /bin/sh -c 'cd /workspace/v54 && export ZEPHYR_SRC=/workspace/src/zephyr-src QEMU_SRC=/workspace/src/qemu-11.1.2 UBOOT_SRC=/workspace/src/u-boot-2026.07 HOME=/workspace/seed/home GLINT_UBOOT_BUILD_DIR=build/uboot GLINT_QEMU_AARCH64=build/qemu-aarch64/qemu-system-aarch64 LD_LIBRARY_PATH=/usr/lib64 && crystal spec spec/run --example aarch64': 27 examples, no failures/errors/pending. In the same seed, register/MMIO/PL011/virtio host checks: 33 passing; image initialization plus small target: 6 passing; aarch64 EFI headers: 1 passing. bin/glint-run aarch64 --mode hypervisor --guest build/aarch64/guest/test.efi --expect "VM: guest powered off" prints "test guest: xHCI 1.0, 4 ports, 8 slots", then shutdown and 24 KiB backed (five image pages and one stack page, unchanged). Outside, with QEMU_SRC, UBOOT_SRC, ZEPHYR_SRC, GLINT_UBOOT_BUILD_DIR and LD_LIBRARY_PATH set: crystal spec spec/run --example x86_64: 27 passing, boot specs unedited. Outside, with QEMU_SRC and UBOOT_SRC unset, ZEPHYR_SRC=/workspace/src/zephyr-src LD_LIBRARY_PATH=/usr/lib64 crystal spec: 1369 examples, 0 failures, 0 errors, 55 expected pending. crystal tool format --check passes. Initial mixed-architecture invocation mistakes and the corrected validation commands are documented in the requested U.1 report.

Size: 215 non-spec lines added, 4 removed (219 changed, 211 net), including documentation; 9 files total. aarch64 EFI: 222208 -> 230400 bytes; x86_64 EFI: 238080 -> 238080 bytes. Largest new function Xhci.write_word: 1204 bytes. Vcpu.boot: 1984 bytes on aarch64, 1996 on x86_64. No heap allocation or startup initializers added. Leaf check-in: 305ddb9fd1 user: x86-1-glint tags: slice/U.1

Claim: the task for U.1: an xHCI register model at guest-physical 0x0c000000 on 5.2's memory space, with capability, extended-capability, operational, port, runtime and doorbell registers at their reset values, and an aarch64 test guest that reads the capabilities, halts and resets the controller, and prints what it read. 8 slots, 1 interrupter, 4 ports. No rings until U.2. Passage: docs/phases/U-usb.md, slice U.1. Demonstration: the values named are cited to QEMU 11.1.2: hcd-xhci.c lines 47-54 (layout), 2753-2800 (capabilities), 3657-3658 (default ports); xhci.h lines 13-14; virt.c line 216 (platform bus). Size: one task file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: db3b38c8ab user: x86-1-glint tags: trunk

Claim: the boots page gains 5.5 and 5.6 on x86_64: the guest finds a virtio console on PCI through I/O ports only and writes a line through its queue. With it, Phase 5's demo passes on both architectures. Passage: the maintainer's request for a recording at each milestone (ocx-console 40c80385db). Demonstration: the cast is the file bin/glint-run wrote on x86-1 at the merge d41e247c31's tree; it exited 0 with the lines the entry quotes. Size: one cast, one page entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: cdfc7d145c user: x86-1-glint tags: trunk

Reviewed against docs/tasks/5.4.md part (ii); verdict merge, after one reviewer fix: the task's formula gave the console PCI device ID 0x1002, which is the balloon's; it is now 0x1003, from QEMU's table. boot/virtio_console.cr is byte-for-byte unchanged from part (i). x86 guests reach the console through configuration ports 0xcf8/0xcfc and an I/O-port BAR only; no memory BAR. After the merge, on top of S.1: format passes; outside the seed the x86_64 phase 4, vcpu, fault, UART, virtio console and image checks (12 examples) and 19 host examples pass; the reviewer's boot shows four guest lines in order and 'VM: guest memory 48 KiB backed' (the guest image grew from four pages to eight). Inside BQ2's seed the aarch64 boots (8 examples) and the small-target spec pass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TUH8KMXZyLk8eDgCjvQ9hX check-in: d41e247c31 user: x86-1-glint tags: trunk