MESH.md step 2. A capsule of F18 code is the words a neighbour writes to a
node's port: for each stretch of memory, "@p a! @p push", the address and
count, "@p !+ unext" and the words; then a jump to the start. A node born
empty executes that from its port, so it needs nothing in it beforehand.
- capsule.h/.c: v4_capsule_write, any node's memory as such a capsule
- mkimage writes the nucleus so, to capsules/v4/nucleus-64.f18, and the
addresses a host needs as a C file; the memory image is no longer linked
into either product
- mkcapsule is unchanged: the nucleus capsule is a built file kept under
capsules/, as BLOCK_MAP.md is, and is baked, hashed and signed with the
rest
- boot: the node is born empty (v4_image_born); the nucleus capsule is
found, its hash and signature checked, and given to the node a word at a
time as it reads its port; PARITY:V4_NUCLEUS carries its name and hash
Verified: test_fabric.c (59 checks, both widths, and under ASan and UBSan):
a memory with a programme and scattered words arrives word for word in an
empty node and runs. The nucleus capsule rebuilds byte for byte.
hosted-check passes on three ISAs; clean qemu with STARFORTH_V4=1 on amd64,
aarch64 and riscv64 takes the nucleus in, passes POST (550 of 550) and
answers lines typed at each prompt (logs/20261006-102421, -102706,
-103048).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
MESH.md step 1, in the engine, which knows nothing of StarForth or of any
kernel.
- node: V4_PORTS ports (8), a build parameter; "any port" and the port the
last such read came from; a read blocks until the neighbour writes, as a
write blocks until the neighbour reads; v4_node_born: empty, P at "any
port"
- exec: a fetch from a port -- @ @b @+ @p, or of an instruction word when P
is a port -- waits for a word; a node executes what arrives at a port
without advancing P; a blocked node goes on from the slot it stopped at
- fabric: the nodes there are and the table of how their ports are wired,
both changed while the nodes run; devices on a port; asleep and awake; a
step is every unblocked node executing one instruction word, then every
write with a reader waiting being handed over
- DECOMPOSITION.md section 6: four named ports withdrawn for V4_PORTS
numbered ones and wiring as data, as ruled
Verified: tests/test_fabric.c, 53 checks at both widths: two nodes exchange
words; an empty node is filled through its port by a device, and by another
node, and runs what it was sent; a word is passed on by a node in between;
a waiting node executes nothing; the wiring is changed while they run; a
node is put to sleep, woken and removed while looping; a node is born while
others run; the fabric is given more room. make -C v4 test and make -C v4
sanitize pass. The single-node products are unchanged: hosted-check on
three ISAs, and clean qemu with STARFORTH_V4=1 on amd64, aarch64 and
riscv64 with lines typed at each prompt (logs/20261006-074907, -075150,
-075532).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
