Robert Allan JamesandClaude Sonnet 5
9a09949c69
mixed_math_word_m_star() confused "double" (two full cell_t-width cells,
128 bits total on this 64-bit build -- what D+/D-/D./etc. all actually
expect) with "the low/high 32-bit halves of a single 64-bit product" --
code clearly written assuming cell_t is 32-bit. It computed an ordinary
64-bit `long long` product (already wrong for any true product exceeding
64 bits, since long long is the same width as one cell here) and split
that into 32-bit halves via `result & 0xFFFFFFFF` / `result >> 32`. For a
small negative product like -56088, this produced a positive, zero-
extended low cell paired with a correctly-looking dhigh=-1 -- D.'s
overflow check (correctly) rejected the resulting malformed double, on
every architecture, every time (this bug was never architecture-specific,
unlike the D+/D-/DNEGATE/d_compare family already fixed in bea8d74/
1a716c8).
Fixed via __int128 for a genuine 64x64->128-bit multiply, no truncation --
an already-established safe pattern in this codebase for exactly this
operation (src/starkernel/crypto/fe25519.c/scalar25519.c already use it;
src/starkernel/arch/amd64/timer.c's own doc comment confirms __int128
multiply/shift-by-constant compile cleanly with zero undefined symbols on
all three target toolchains -- only division needs unavailable libgcc
support, not used here).
Verified: rebuilt and booted all three architectures clean. T13/T14 both
correct everywhere (56088/-56088). Manual cases confirm genuine 128-bit
precision: -1 -1 M* -> 1; 1000000000000 1000000000000 M* -> dhigh=54210
dlow=2003764205206896640 (10^12 x 10^12 = 10^24, correctly exceeding 64
bits). Full 24-case exerciser reran clean on all three, no regressions.
Found while verifying, NOT fixed (report only, out of scope of this
request): mixed_math_word_m_slash_mod() (M/MOD, the very next function in
the same file) has the identical bug class -- confirmed genuinely broken
for a true wide double (feeding this fix's own correct large-magnitude M*
output into M/MOD produces a result wrong by many orders of magnitude and
the wrong sign). Flagged in FABRIC-3.md for a future fix request.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EXieurDfDSsDFdnSyusuWo
LithosAnanke v2.0.1
UEFI-bootable FORTH microkernel. Boots from firmware, initialises memory and interrupts, then runs the StarForth VM as its sole userspace runtime. No libc. No OS. Just stone and necessity.
Lithos (foundation) + Ananke (necessity) — the kernel under StarshipOS.
Status — M7.1 (Capsule System · Multi-VM Fleet)
| Milestone | Status | |
|---|---|---|
| M0–M6 | UEFI boot · PMM · VMM · IDT · APIC · heap · framebuffer VT100 console (v1.5.1-FINAL) | ✅ Complete |
| M7 | StarForth VM integration + parity validation | ✅ Complete |
| M7.1 | Capsule birth protocol · Mama FORTH vocabulary · Tripod multi-VM fleet (Hermes/Artemis) · Word-level ACL (Phases 1–7) | 🔄 In Progress |
| M8 | REPL — keyboard input, interactive Forth | Planned |
| M9 | Block storage — AHCI driver | Planned |
POST at boot: parity hash verified across amd64/aarch64/riscv64 · Mama capsule dictionary: 453 words
What's live in M7.1
- Tripod — a named multi-VM fleet (Hera the Mama VM, Artemis, two Hermes instances) births, runs, and re-births independently, verified booting live pre-REPL on all three architectures.
- Hermes — a 17-block inter-VM messaging/channel layer between fleet members, with async delivery and channel negotiation.
- Artemis — a Block Allocation Map (BAM) storage subsystem with Q48.16
block-heat tracking and cooldown/reclamation (
ART-COOL/ART-REAP). - Word-level ACL — every dictionary entry carries a TTL/allow/mode/pin
access-control record. Strict, TTL, and pinned modes; two console layers
(emergency
ok>and superuserzuse)ok>). Phases 1–7 complete (C infrastructure, FORTH policy layer,zusebootstrap superuser, Isabelle proof stubs, kernel parity); Phase 8 (Ed25519 PKI / thumbdrive challenge-response) is the only item remaining. Measured overhead once active on every check: +0.0054%–+0.0088%, CV = 0.000%, across a 3×3 Latin-square DoE campaign (architecture × seed × 30 replicates) — three orders of magnitude below the measurement floor. - VM Fleet Attractor physics — the L8 Jacquard mode selector now has a real per-VM heat channel into fleet-wide tuning, replacing hardcoded compudynamics constants with a dynamically-inferred rate.
- Kconfig build configuration — every physics/heartbeat/pipelining/ kernel-only tuning knob (~40 total) is now a discoverable, optional Kconfig symbol shared with the hosted VM build. See Quick Start below.
Quick Start
# Build kernel (requires cross-compilation toolchain, or native gcc)
make -f Makefile.starkernel ARCH=amd64
# Run in QEMU with OVMF
make -f Makefile.starkernel qemu
# Other architectures
make -f Makefile.starkernel ARCH=aarch64 qemu
make -f Makefile.starkernel ARCH=riscv64 qemu
Artifacts: build/amd64/kernel/starkernel_loader.efi · build/amd64/kernel/starkernel_kernel.elf
For the hosted VM by itself (Linux, no cross-compiler needed, no bare-metal tooling): see
the separate StarForth repository — LithosAnanke used to be a branch inside that repo,
now it's its own project with its own master.
Build configuration (optional)
Every kernel-only knob (STARFORTH_ENABLE_VM, PARITY_MODE, the shared
physics/heartbeat family, etc.) is an optional Kconfig symbol — a plain
make -f Makefile.starkernel uses the same defaults it always has unless
you opt in:
make -f Makefile.starkernel ARCH=amd64 menuconfig
make -f Makefile.starkernel ARCH=amd64 kernel_amd64_defconfig
Documentation
| System Architecture | Full kernel + VM design |
| HAL Reference | Hardware abstraction layer interfaces |
| Capsule System — M7.1 | Capsule birth protocol design |
| VM Fleet Attractor design log | Tripod/Hermes/Artemis physics + build-system history |
| Getting Started / Kconfig reference | Full symbol reference for both build targets |
| Changelog | Milestone-level history |
| Roadmap | Milestone plan through self-hosting |
License
Starship License 1.0 (SL-1.0) — free for personal, research, and educational use. Commercial use requires a separate agreement. Attribution to R.A. James (Captain Bob) must be preserved in all distributions.
Patent pending. USPTO provisional filed December 2025 — physics-grounded self-adaptive runtime system. This license does not grant patent rights. Licensing inquiries: rajames440@gmail.com
Robert A. James (Captain Bob) · Systems Engineer · Hacking since 1973