rajamesandClaude Opus 5.5
506b645726
clean qemu with STARFORTH_V4=1 on amd64, aarch64 and riscv64, one at a time. Each prints the same PARITY:V4_NUCLEUS and PARITY:V4_CAPSULE lines as the three hosted binaries (image_hash 0x60b74e4f87adb0ac, dict_hash 0x0baed67626b4fac4), then PARITY:OK and ok>. Each run was ended once the prompt was in the log. Nothing was typed at a bare-metal prompt. The capsules were unsigned: no signing key on this machine. The v3 boot (STARFORTH_V4=0) was not re-run. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
76 lines
3.5 KiB
Markdown
76 lines
3.5 KiB
Markdown
# v4/
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StarForth v4: the 32-instruction F18-derived core. The design lives in
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`docs/v4.0.0/JUSTIFICATION.md` (why) and `docs/v4.0.0/DECOMPOSITION.md`
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(every v3 word mapped to a v4 fate).
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The first deliverable is the hosted C99 golden model (`JUSTIFICATION.md` §10,
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step 1). It must pass POST and hold K≡1.0 with 32- and 64-bit cells on all
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three host ISAs.
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Acceptance (`JUSTIFICATION.md` §16): v4 must be equivalent to v3 at any point
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in time, with the same vocabularies and behaviour, on the F18-derived engine;
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and every ISA, hosted and bare metal, must still reach its `ok` prompt.
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`make -C v4 test` passing is a development check, not acceptance.
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What exists so far is the single node: registers, circular stacks, memory, all
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32 opcodes, per-opcode and per-call-target heat, and three console
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registers (`CONSOLE-TX`, which captures output, and `CONSOLE-RX` and `CONSOLE-STATUS`, which hand out
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input a test feeds) standing in for the console node until the mesh exists. The tests load definitions
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onto a node either opcode by opcode (`v4/include/v4/asm.h`) or as text in the notation `DECOMPOSITION.md`
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uses (`v4/include/v4/text.h`). `make -C v4 test` builds
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and runs the tests at both cell widths; `make -C v4 sanitize` repeats them
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under ASan and UBSan. There is no POST and no K measurement yet.
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## The system: nucleus, capsules, prompt
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`docs/v4.0.0/NUCLEUS.md` is the design. A v4 system is four things:
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| Part | Where | What it is |
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|---|---|---|
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| Engine | `v4/src` | The golden model of the 32-opcode node |
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| Nucleus | `v4/capsule/*.v4`, built by `v4/tools/mkimage.c` | The assembled words, as a memory image linked into the binary |
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| Capsules | `capsules/v4/*.4th`, baked by `tools/mkcapsule.c` | FORTH source, loaded when the system comes up |
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| Boot | `v4/system/boot.c` | Starts the nucleus, checks and loads each capsule, prints the parity lines, gives the prompt |
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Two products link the same four and differ only in the console:
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- **Hosted Linux**, `v4/tools/hosted.c`: `make -C v4 hosted` builds
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`v4/build/starforth4-amd64`, `-aarch64` and `-riscv64`, static, 64-bit cells.
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- **Bare metal**, `kernel/src/v4/sk_v4.c`: `make -f kernel/Makefile ARCH=<arch> STARFORTH_V4=1`.
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A boot prints:
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```
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PARITY:V4_NUCLEUS words=292 image_hash=0x...
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PARITY:V4_CAPSULE name=v4:forth79.4th capsule_id=0x... capsule_hash=0x... dict_hash=0x...
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PARITY:OK
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ok>
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```
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Every build of one commit prints the same hashes. `make -C v4 hosted-check`
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boots the three hosted binaries (the two foreign ones under user-mode QEMU)
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and fails unless their output is identical and ends in `PARITY:OK`.
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A capsule line the node does not answer ` ok` to ends the boot, naming the
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capsule, block and line, with `PARITY:FAIL` and `POST: FAILED`.
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State, 2026-10-05: capsule loading works on all six builds. The three hosted
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binaries and the three bare-metal kernels (`clean qemu` with `STARFORTH_V4=1`)
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print the same four lines and reach `ok>`:
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```
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PARITY:V4_NUCLEUS words=292 image_hash=0x60b74e4f87adb0ac
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PARITY:V4_CAPSULE name=v4:forth79.4th capsule_id=0xa4b74bdc7deaf204 capsule_hash=0xa4b74bdc7deaf204 dict_hash=0x0baed67626b4fac4
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PARITY:OK
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ok>
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```
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Bare-metal logs: `logs/20261005-152955/amd64/`, `logs/20261005-154021/aarch64/`,
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`logs/20261005-154150/riscv64/`. Each run was ended once the prompt was in the
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log; nothing was typed at a bare-metal prompt, so keyboard input there is not
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yet verified. The capsules were unsigned (no signing key on this machine).
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`forth79.4th` holds no definitions yet: all 292 words are still in the
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nucleus. There is no POST yet.
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