Robert Allan JamesandClaude Sonnet 5
bc31916461
Continued investigating the aarch64 BYE cold-restart exception (FABRIC-2.md Section I). Added permanent boot diagnostics: kmalloc_heap_base_addr()/ kmalloc_heap_end_addr() now print in print_heap_stats(), confirming the fault address is provably inside the kmalloc heap (not kernel code, not firmware). Bumped aarch64 QEMU RAM to 4096MB to test heap-placement sensitivity (no effect -- heap size is a fixed 2GiB default, independent of total RAM once "enough" exists). Three separate live gdb debugging attempts (software breakpoint, hardware breakpoint on arch_cold_reset, hardware breakpoint on mama_word_bye's entry) all silently failed to fire despite disassembly-confirmed-correct addresses and confirmed execution reaching those points. A sanity check (hbreak on console_println, called thousands of times per boot) also never fired even 8802 lines into a serial log -- conclusively a gdbstub/QEMU tooling limitation for this aarch64 target, not a kernel-side finding. Live single-stepping is not currently viable here; documented so it isn't re-attempted the same way. Root cause still open. Full trail in FABRIC-2.md Section I. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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