Robert Allan JamesandClaude Sonnet 5
6e9c1d3bc2
Corrected meta_fence_blocks units from "Forth 1 KiB blocks" to 4 KiB devblocks (matching bam_devblocks/reloc_devblocks) before anything depended on the original meaning -- a clean fix, not a migration. This let the fence fold directly into compute_totals_from_B()'s existing payload4k formula (total_devblocks - 1 - B - R - F) instead of a separate user_blocks subtraction: total_blocks/user_blocks/free_blocks all shrink correctly for free, in both the fresh-format and reload paths, from one formula change. New blk_meta_zone_read()/blk_meta_zone_write() -- raw, unpacked 4 KiB devblock I/O, same shape as the header/BAM/reloc-table regions, addressed by devblock_from_top counting down from the device's last physical devblock. Refuses rather than clamps if the index exceeds the on-disk meta_fence_blocks. C-only, no FORTH word wraps either -- same discipline as vm_zuse_cert_install(), which will be this zone's first real tenant. Verified independently at every step, never trusting the kernel's own report: capacity math cross-checked against a from-scratch Python recomputation of the same formula (exact match); accessor correctness via a temporary probe (written/run/captured/reverted) that wrote a known pattern and read it back, then independently confirmed via a raw read of the disk image at the exact expected physical byte offset. Full 3-arch acceptance boot against the real, untouched disk/artemis.img, probe code fully reverted -- clean, conservation intact. Still open: wiring vm_zuse_cert_install() to actually persist through these accessors, and the MINT word itself. Documented in FABRIC-3.md. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01U14ET9CWAtbQMbYqomKgXd
capsules/
FORTH personality files loaded by the VM at boot. A capsule is an immutable, content-addressed payload; its XXHash64 hash is its identity. Any mutation changes the hash and the birth protocol rejects the image.
Key files
| File | Type | Purpose |
|---|---|---|
init.4th |
(m) MAMA_INIT |
Default Mama VM personality — loaded at LBN 2048 |
ACL.4th |
user | Word-level ACL system; self-activating at boot |
zuse.4th |
user | Bootstrap superuser; loaded by ACL.4th |
doe.4th |
user | DoE workload words (EXEC-DOE) — opt-in |
init-0.4th … init-9.4th |
(p) |
Numbered personality variants |
init-l8-*.4th |
(p) |
L8 Jacquard mode variants (stable/volatile/diverse/temporal/transition/omni) |
hermes/init.4th |
(p) |
Hermes baby VM personality |
artemis/init.4th |
(p) |
Artemis baby VM personality |
Block namespace
Block ranges are shared across all loaded capsules — collisions cause silent word-definition overwrites.
| Range | Owner |
|---|---|
| 2048–2099 | init.4th |
| 2100–2199 | doe.4th |
| 3000–3999 | workload capsules |
| 4000+ | user-defined (ACL.4th, zuse.4th, …) |
Each block is limited to 1024 bytes. Verify with wc -c before committing.
See also
experiments/bare_metal/README.md— DoE protocols and block namespace rulesdocs/03-architecture/word-acl/DESIGN.md— ACL system designtools/mkcapsule.c— assembles capsules intocapsule_generated.c- Project root