Robert Allan JamesandClaude Sonnet 5
4d4ab59189
The overflow-triggered migration path (a WIREBIND-attached identity's own drive running low on space) was scoped but never built -- only the trigger-detection call site was missing, per this section's own text. - capsule_wirebind.c now tracks the attached blkio_dev* alongside the already-tracked VM id, set in try_attach() and cleared in both EJECT/UNCLEAN paths. - New capsule_wirebind_overflow_idle_check(), called once per idle tick in repl.c right alongside blk_migration_idle_check() (same cadence): reads the attached drive's free/total via blk_get_device_free_blocks(), and if free space is below a fixed 10% threshold, extends the identity's pool with a one-time blk_firsttouch_claim() of 8 additional devblocks on Artemis's system-resident device. - New blk_owner_has_claim(owner_fp) in block_subsystem.c answers the debounce question blk_firsttouch_claim()'s own doc comment had left open: a disk scan, not a RAM flag, so the already-extended answer survives reboot/reattach, matching BMAPFMT's "ownership travels with the block" model. Premise checked before building (does a WIREBIND-attached drive actually give a real free/total signal, or does it stay PROVISIONAL/raw): traced repl.c's attach sequence and confirmed blk_subsys_attach_device() runs on the same dev pointer right after WIREBIND, and a WIREBIND-eligible drive is always already STFR/v2-formatted, so the signal is real. Premise held, unlike the BAM item's overstated one. Verified with the mandatory 3-arch QEMU acceptance (identical dictionary hashes, no regression) plus a live logic test of blk_owner_has_claim(): a temporary TEST-OWNER-CLAIM word, run once via SK_CMD and reverted, confirmed it correctly detects the claiming owner and rejects an unrelated one. The low-disk-space-triggers-a-claim path itself is not verified end-to-end -- that needs a real minted WIREBIND-user thumbdrive with deliberately tiny capacity, out of scope for this pass; noted as such in the FABRIC-2.md §I.2 closure note rather than overclaimed. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018EjXFo7mPXjUMjfJeuUUz4
984 lines
45 KiB
C
984 lines
45 KiB
C
/*
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StarForth — Steady-State Virtual Machine Runtime
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Copyright (c) 2023–2025 Robert A. James
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All rights reserved.
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Licensed under the StarForth License, Version 1.0
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*/
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/**
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* repl.c - Emergency FORTH REPL for LithosAnanke kernel
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*
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* Direct adaptation of src/repl.c for the freestanding kernel context.
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* Replaces libc stdio (fgets/printf/fflush) with HAL serial I/O:
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* - Input: console_getc() non-blocking poll with local echo and backspace
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* - Output: console_puts() / console_putc()
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*
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* Idle spin: polls console_getc() and services the adaptive heartbeat.
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* The timer ISR's top half (heartbeat_tick()) latches one
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* sample per interrupt; the idle spin drains it every
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* iteration via heartbeat_service() (item 0.8, FABRIC-0.md §26)
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* and calls sk_repl_idle() once per SK_IDLE_BEAT_INTERVAL ticks
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* for coarser subsystem dispatch. On QEMU TCG the ISR must fire
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* for ticks to advance — check "Heartbeat: N ticks" in the
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* serial log to confirm.
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*
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* Runs with interrupts enabled so the APIC heartbeat fires normally.
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* Designed as the last thing kernel_main does before the idle loop.
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*/
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#include "starkernel/repl.h"
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#include "console.h"
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#include "log.h"
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#include "vm.h"
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#include "version.h"
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#include "starkernel/timer.h"
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#include "starkernel/arch.h"
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#include "starkernel/xhci_driver.h"
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#include "starkernel/blkio_usb.h"
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#include "starkernel/homeblocks_sig.h"
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#include "starkernel/capsule_birth.h"
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#include "starkernel/capsule_zuse_boot.h"
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#include "starkernel/capsule_wirebind.h"
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#include "starkernel/capsule_run.h"
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#include "starkernel/vm/bootstrap/sk_vm_bootstrap.h"
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#include "block_subsystem.h"
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#include "word_source/include/keyboard_words.h"
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#include "word_source/include/block_words.h"
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#include "freestanding/stdio.h"
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#include <stdint.h>
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#include <string.h>
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/* FABRIC-0.md 4.4: "ok>" (including its trailing space) renders in bright
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* cyan, 0x55FFFF -- reuses FB_ANSI_PALETTE[14]. Sent as a real SGR escape
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* so it colors both the framebuffer (parsed by vt100.c's apply_sgr()) and
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* any ANSI-aware serial terminal, per 4.4c's "identical on both" goal. */
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#define SK_PROMPT_TEXT "\x1b[38;2;85;255;255mok> \x1b[39m"
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const char lithos_version[64] = LITHOS_VERSION_STR;
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/* FABRIC-0.md §27.8/4.4s, unblocked 2026-09-04: extends the prompt to
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* "[VM name] (user) ok>" (e.g. "[Hera] (zuse) ok>") whenever an
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* identity is currently attached -- Zuse (mama_vm->zuse_session; there
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* is only ever one, so no username lookup needed) or a regular WIREBIND
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* user (capsule_wirebind_attached_username()). Checked independently of
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* which VM's own bracket console.c is currently showing: both identities
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* are console-level attach state, not per-VM dictionary state, so the
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* segment reflects "who is at the console" the same way regardless of
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* which VM you've USE'd into. Prints nothing (bare "ok> ", today's
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* existing format, unchanged) when neither is attached -- Hera's own
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* documented normal steady state (FABRIC-2.md §D.2). */
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static void sk_print_prompt(void) {
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VM *mama_vm = (VM *)sk_get_mama_vm();
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const char *username;
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if (mama_vm && mama_vm->zuse_session) {
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console_puts("(zuse) ");
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} else if ((username = capsule_wirebind_attached_username()) != (const char *)0) {
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console_puts("(");
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console_puts(username);
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console_puts(") ");
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}
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console_puts(SK_PROMPT_TEXT);
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}
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/*===========================================================================
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* USE-word dispatch: which VM receives REPL input.
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*
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* NULL means "use the REPL's own vm parameter" (default — Mama).
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* Set via sk_repl_set_active_vm(); read by sk_repl_run() each iteration.
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*===========================================================================*/
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static VM *g_repl_active_vm = (void *)0;
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void sk_repl_set_active_vm(VM *vm) { g_repl_active_vm = vm; }
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VM *sk_repl_get_active_vm(void) { return g_repl_active_vm; }
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/*===========================================================================
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* Currently attached home-blocks device: mirrors g_repl_active_vm's own
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* shape (FABRIC-2.md §F.9's own precedent for this exact accessor). Set
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* once sk_repl_idle()'s own attach handling confirms HOMEBLOCKS_SIG_OK
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* below; cleared on detach. RUNCAP (§F.6/§F.18) and, later, BINDSTEP's
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* re-verify-live check (§F.9) both need this -- neither lives in this
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* file, and usb_blk_dev/xdev below are function-static, invisible outside
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* sk_repl_idle() without an accessor like this one.
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*===========================================================================*/
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static blkio_dev_t *g_homeblocks_dev = (void *)0;
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static homeblocks_sig_t g_homeblocks_sig;
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static int g_homeblocks_sig_valid = 0;
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blkio_dev_t *sk_repl_get_homeblocks_dev(void) {
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return g_homeblocks_sig_valid ? g_homeblocks_dev : (void *)0;
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}
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const homeblocks_sig_t *sk_repl_get_homeblocks_sig(void) {
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return g_homeblocks_sig_valid ? &g_homeblocks_sig : (void *)0;
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}
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/* The currently attached USB block device, regardless of whether it
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* checks out as a recognized home-blocks drive -- MINT (§F.8/§F.19)
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* targets a blank/unminted drive, which by definition never sets
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* g_homeblocks_dev above (that only latches on HOMEBLOCKS_SIG_OK).
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* Set once blk_subsys_attach_device() succeeds below, cleared on detach
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* alongside g_homeblocks_dev. */
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static blkio_dev_t *g_attached_blk_dev = (void *)0;
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blkio_dev_t *sk_repl_get_attached_blk_dev(void) {
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return g_attached_blk_dev;
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}
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/*===========================================================================
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* Idle heartbeat service
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*
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* Called from sk_console_readline()/sk_console_getkey() when heartbeat_ticks() has advanced by at least
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* SK_IDLE_BEAT_INTERVAL since the last service call. Extend this function
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* as higher-level subsystems (msg_fabric, capsule scheduler) come online.
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*
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* TODO: cadence policy and subsystem dispatch belong in Compudynamics once
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* that layer governs cooperative VM execution.
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*===========================================================================*/
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#define SK_IDLE_BEAT_INTERVAL 100u /* ticks between idle service calls (1 s at 100 Hz) */
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static uint64_t g_last_beat_tick; /* zero-initialized (BSS) */
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/* Cursor blink, 2026-09-05: the framebuffer cursor (now a thin vertical
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* bar, vt100.c's vt100_draw_cursor()) blinks on/off every
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* SK_CURSOR_BLINK_INTERVAL ticks while sk_console_readline()'s idle loop
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* is spinning -- i.e. whenever nothing has been typed for that long,
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* whether sitting at a bare prompt or paused mid-edit. g_cursor_visible
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* tracks which half of the blink cycle is current; sk_cursor_show() below
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* is the single place that resets the cycle back to "on" and redraws --
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* every deterministic draw site (fresh prompt, echoed character,
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* backspace) calls it instead of vt100_draw_cursor() directly, so typing
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* always shows a solid cursor rather than possibly landing mid-blink. */
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#define SK_CURSOR_BLINK_INTERVAL 50u /* ticks between blink toggles (500 ms at 100 Hz) */
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static uint64_t g_cursor_blink_tick; /* zero-initialized (BSS) */
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static int g_cursor_visible = 1;
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static void sk_cursor_show(void)
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{
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g_cursor_visible = 1;
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g_cursor_blink_tick = heartbeat_ticks();
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console_fb_draw_cursor();
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}
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/* Reentrancy guards for the MSG-TICK pump inside sk_repl_idle().
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*
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* sk_repl_idle() runs vm_interpret(mama, ...) (below) to VM-EXEC MSG-TICK
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* into every live child VM (FABRIC-2.md Phase C). But sk_repl_idle() is
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* itself called from the blocking KEY/EXPECT/QUERY reads (sk_console_getkey()
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* / sk_console_readline(), which run *from inside* the executing VM's own
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* vm_interpret once a FORTH word reads input mid-line). vm_interpret() is
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* not reentrant -- it resets the VM's single input_buffer/input_pos/
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* input_length (vm_core.c) on entry. Calling vm_interpret(mama, ...) at that
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* point would re-enter mama's interpreter mid-parse and silently truncate
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* the rest of the line; if the pump's own MSG-TICK work then triggers another
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* blocking read, it would also recurse unboundedly. Two flags keep the pump
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* off every path that could re-enter an interpreter:
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* - g_mama_interpreting: set while Hera is executing a dispatched line, so
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* the pump defers to the next safe (prompt) boundary.
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* - g_idle_pump_active: belt-and-suspenders; stops recursive re-entry
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* from inside the pump's own vm_interpret call.
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*/
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static int g_mama_interpreting; /* zero-initialized (BSS) */
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static int g_idle_pump_active; /* zero-initialized (BSS) */
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static void sk_repl_idle(VM *active_vm)
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{
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/* Close any dangling output line before this bottom half emits its own
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* chatter (xhci attach/detach progress, block-subsystem notices). If we
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* are mid-prompt-line -- the REPL started the attach while sitting at
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* "ok> " -- a bare console_println() would otherwise glue its text onto
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* the prompt and inherit no {VMName} prefix (g_line_start is 0). A
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* fresh line first keeps every idle line prefix-tagged and readable,
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* matching what an interactive typing session expects. No-op when the
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* console is already at a line boundary.
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*
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* FABRIC-2.md §I.9 fix, 2026-09-05: this newline is now deferred (see
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* console_ensure_line_start()'s own doc comment) -- it only actually
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* reaches the console if something below really prints. tx_before_idle
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* lets this function tell "nothing happened" apart from "something did"
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* the same way the reanchor check further up this file already does,
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* so a beat with nothing to report can cancel the deferred newline
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* before returning, leaving the bare prompt line completely untouched
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* instead of visibly snapping it to a fresh blank line every ~1s. */
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console_ensure_line_start();
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uint64_t tx_before_idle = console_tx_count();
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/* Artemis Milestone 2d: xHCI Event Ring servicing. This is exactly the
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* "interrupt-driven, coarse cadence, cheap early-exit" trigger Section
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* U item 6 asked for -- xhci_poll_events() is a no-op read (loop
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* condition false immediately) whenever nothing is pending, and this
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* hook already runs at a deliberately coarser cadence than the raw
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* per-tick ISR (SK_IDLE_BEAT_INTERVAL, ~1s at 100Hz), matching "quick
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* check... done... ignore what we can... done." A no-op call if no
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* controller was found/brought up (xhci_bringup() never latched a
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* device). */
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xhci_poll_events();
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/* Milestone 2h: a Mass Storage/BOT device finished SET_CONFIGURATION
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* during the xhci_poll_events() call just above -- run the
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* synchronous capacity query + block-subsystem attach here, strictly
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* after that call has already returned (see bot_msc_attach_pending's
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* own doc comment in xhci_driver.h for why: xhci_bot_wait_for_idle()'s
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* busy-wait -- which blkio_usb_open_msc() uses internally -- must
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* never run from inside xhci_poll_events()'s own call frame). */
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xhci_dev_t *xdev = xhci_get_dev();
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static blkio_dev_t usb_blk_dev; /* single-device scope, matching the xHCI
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* driver's own; referenced by both the
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* attach and detach handling below. */
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if (xdev && xdev->bot_msc_attach_pending) {
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xdev->bot_msc_attach_pending = 0;
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uint32_t slot_id = xdev->bot_msc_attach_slot_id;
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int rc = blkio_usb_open_msc(&usb_blk_dev, xdev, slot_id);
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if (rc == 0) {
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/* FABRIC-2.md Milestone 4: warn on blank/foreign/unrecognized
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* media -- the "warn" half. No "refuse" half yet: blkio_usb.c
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* has no SCSI WRITE(10) support at all (Milestone 2's biggest
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* open item), so there is no write path today to refuse --
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* only read-only attach, which is also the general-purpose USB
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* block I/O path this repo already relies on for unrelated
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* testing, not exclusively a home-blocks identity workflow.
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* Refusing attach on blank media here would break that
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* legitimate use without protecting anything real yet. Refuse
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* belongs on the write path, once WRITE(10) gives it something
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* to gate.
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*
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* HOMEBLOCKS_SIG_START_FBLOCK (devblock 1): the real, final
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* location -- GPT was dropped permanently, this is not an
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* interim value (FABRIC-2.md §F.8/§F.13). */
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homeblocks_sig_t sig;
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homeblocks_sig_result_t sig_rc =
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homeblocks_sig_check(&usb_blk_dev, HOMEBLOCKS_SIG_START_FBLOCK, &sig);
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switch (sig_rc) {
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case HOMEBLOCKS_SIG_OK:
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log_message(LOG_DEBUG, "xhci: USB drive recognized as a home-blocks drive");
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g_homeblocks_dev = &usb_blk_dev;
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g_homeblocks_sig = sig;
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g_homeblocks_sig_valid = 1;
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break;
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case HOMEBLOCKS_SIG_BLANK:
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log_message(LOG_DEBUG, "xhci: USB drive not recognized (blank or foreign media) -- read-only general use only");
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break;
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case HOMEBLOCKS_SIG_BAD_VERSION:
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log_message(LOG_WARN, "xhci: USB drive has a home-blocks header of an unrecognized version -- read-only general use only");
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break;
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case HOMEBLOCKS_SIG_BAD_CRC:
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log_message(LOG_WARN, "xhci: USB drive has a home-blocks header that fails its checksum (corrupt or tampered) -- read-only general use only");
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break;
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case HOMEBLOCKS_SIG_READ_ERROR:
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log_message(LOG_ERROR, "xhci: USB drive signature check failed to read the device -- read-only general use only");
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break;
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}
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/* FABRIC-2.md §F.20/§F.21: Zuse is thumbdrive-resident now,
|
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* not system-resident -- this is the only point in the boot
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* lifecycle a just-attached drive's sig result is known, so
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* genesis-mint/attach-authenticate has to happen from here,
|
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* not as a one-shot kernel_main.c step (a thumbdrive can't
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* be detected before the REPL's own idle polling exists to
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* detect it). No-ops immediately if Zuse already has a real
|
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* identity this boot. */
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capsule_zuse_boot_try_attach(&usb_blk_dev, sig_rc, &sig, (VM *)sk_get_mama_vm());
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/* FABRIC-2.md §F.5/§F.23 (WIREBIND): the real thumbdrive-
|
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* attach call site for a regular (non-Zuse) identity --
|
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* verify-then-birth-then-pair, replacing the RUNCAP-TEST/
|
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* PAIR-TEST diagnostic words that exercised each piece by
|
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* hand. Only meaningful for a drive that actually checked
|
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* out (HOMEBLOCKS_SIG_OK); capsule_wirebind_try_attach()
|
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* itself no-ops for a genesis-mode Zuse drive (no cert
|
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* region) or before Zuse has authenticated this boot. */
|
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if (sig_rc == HOMEBLOCKS_SIG_OK) {
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capsule_wirebind_try_attach(&usb_blk_dev, &sig, (VM *)sk_get_mama_vm());
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}
|
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}
|
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if (rc == 0 && blk_subsys_attach_device(&usb_blk_dev) == BLK_OK) {
|
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xdev->bot_msc_attached = 1;
|
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g_attached_blk_dev = &usb_blk_dev;
|
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} else {
|
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log_message(LOG_ERROR, "xhci: USB MSC block-subsystem attach failed");
|
||
}
|
||
}
|
||
|
||
/* Milestone 2h hot-detach: the device disconnected (PORTSC, inside the
|
||
* xhci_poll_events() call above) after having actually attached.
|
||
* blk_subsys_detach_device() is local block_subsystem.c bookkeeping --
|
||
* no device round-trip, so it wouldn't strictly need to run outside
|
||
* xhci_poll_events()'s own call frame -- but handling it here anyway
|
||
* matches the attach path's shape and keeps xhci.c decoupled from
|
||
* block_subsystem.c (see bot_msc_detach_pending's own doc comment). */
|
||
if (xdev && xdev->bot_msc_detach_pending) {
|
||
xdev->bot_msc_detach_pending = 0;
|
||
blk_subsys_detach_device(&usb_blk_dev);
|
||
if (g_homeblocks_dev == &usb_blk_dev) {
|
||
g_homeblocks_dev = (void *)0;
|
||
g_homeblocks_sig_valid = 0;
|
||
}
|
||
if (g_attached_blk_dev == &usb_blk_dev) {
|
||
g_attached_blk_dev = (void *)0;
|
||
}
|
||
|
||
/* FABRIC-2.md §F.10 decision 2 (UNCLEAN, closed alongside EJECT):
|
||
* the device is already gone -- no-op if WIREBIND never had
|
||
* anything tracked (general-purpose USB use, not a home-blocks
|
||
* identity drive). */
|
||
capsule_wirebind_unclean_detach();
|
||
|
||
/* FABRIC-2.md §I.8, re-scoped 2026-09-04: Zuse logs out on device
|
||
* removal exactly like a WIREBIND user -- no-op if the device
|
||
* that just left wasn't hers. */
|
||
capsule_zuse_boot_logout((VM *)sk_get_mama_vm());
|
||
}
|
||
|
||
/* FABRIC-0.md/FABRIC-1.md Section V item 6: "a cheap 'anything dirty?
|
||
* no? done' block-sync check", the same "interrupt-driven, coarse
|
||
* cadence, cheap early-exit" trigger shape as the xHCI servicing
|
||
* above -- this was the one piece of that design already fully
|
||
* specified and waiting for this hook to actually be non-empty.
|
||
* blk_vm_flush_all() (block_words.c, the same code SAVE-BUFFERS
|
||
* itself runs) is cheap to call when nothing is dirty -- every
|
||
* check inside is a small fixed-size scan, no disk I/O happens
|
||
* unless something genuinely needs writing -- so no separate
|
||
* "is anything dirty" pre-check is needed here.
|
||
*
|
||
* active_vm is passed in by the caller (sk_console_readline(), itself passed
|
||
* through from sk_repl_run()/sk_repl_step()'s own already-resolved
|
||
* VM) rather than read via sk_repl_get_active_vm() here -- that
|
||
* accessor returns NULL whenever Tripod's USE word hasn't redirected
|
||
* it, which is the common case, not "no VM is active." An earlier
|
||
* version of this code called sk_repl_get_active_vm() directly and
|
||
* silently no-op'd for exactly that reason, confirmed live: a BUFFER
|
||
* write with no UPDATE, followed by an idle wait and an abrupt kill,
|
||
* did not survive a reboot until this fix. */
|
||
blk_vm_flush_all(active_vm);
|
||
|
||
/* FABRIC-2.md §I.2, built 2026-09-04: heat/wear-leveling migration
|
||
* trigger -- one linear scan of Artemis's own device per idle tick
|
||
* (same ~1 Hz SK_IDLE_BEAT_INTERVAL cadence this whole function
|
||
* already runs at, chosen so a hot devblock is caught proactively
|
||
* rather than only on a failed write). See block_subsystem.c's own
|
||
* doc comment on blk_migration_idle_check() for what's built (heat-
|
||
* based relocation) vs. deliberately left open (overflow-triggered
|
||
* migration, needs a call site threaded from WIREBIND). */
|
||
blk_migration_idle_check();
|
||
|
||
/* FABRIC-2.md §I.2's own overflow trigger, closed 2026-09-05: the
|
||
* call site named above, now built. Same cadence, same idle-tick
|
||
* neighbor -- see capsule_wirebind_overflow_idle_check()'s own doc
|
||
* comment for what it does and why it's a one-time extension, not a
|
||
* growth loop. */
|
||
capsule_wirebind_overflow_idle_check();
|
||
|
||
/* FABRIC-2.md Phase C (2026-08-28): distributed messaging pump. Every
|
||
* live VM except Hera herself now owns its own MSG-ARENA/CH-ARENA and
|
||
* MSG-TICK word (see capsules/common/messaging.4th) instead of only
|
||
* Hermes having one -- "fully distributed, Hera pumps each VM's
|
||
* drain" was the confirmed design. Hera is excluded: she never loads
|
||
* common:messaging.4th (kernel_main.c's own comment at the Hermes-
|
||
* birth call site explains why -- the STADIUM-* primitives it needs
|
||
* are deliberately never registered in her own dictionary, to keep
|
||
* her dict_hash off item 4.1's baseline), so MSG-TICK is genuinely
|
||
* absent there, not just untried. She is the only VM with a
|
||
* persistent idle tick, so she walks the registry once per idle beat
|
||
* and VM-EXECs MSG-TICK into every OTHER live VM's own dictionary. */
|
||
VM *mama = (VM *)sk_get_mama_vm();
|
||
|
||
/* Reentrancy guard: never run the pump while mama is mid-interpret
|
||
* (a dispatched line, or recursively from within the pump's own
|
||
* vm_interpret). vm_interpret() clobbers the VM's single input
|
||
* buffer, so re-entering it here while KEY/EXPECT/QUERY blocks inside
|
||
* a live parse truncates the rest of that line. Deferring the MSG-TICK
|
||
* drain to the next prompt boundary is safe -- draining is best-effort
|
||
* and simply resumes next beat. */
|
||
if (g_mama_interpreting || g_idle_pump_active) {
|
||
if (console_tx_count() == tx_before_idle) {
|
||
console_cancel_deferred_line_start();
|
||
}
|
||
return;
|
||
}
|
||
|
||
g_idle_pump_active = 1;
|
||
{
|
||
uint32_t count = capsule_vm_registry_count();
|
||
uint32_t i;
|
||
for (i = 0; i < count; i++) {
|
||
VMRegistryEntry ent;
|
||
if (capsule_vm_registry_get_by_index(i, &ent) != 0) continue;
|
||
if (ent.state != VM_STATE_LIVE) continue;
|
||
if (ent.vm_ptr == (void *)mama) continue;
|
||
|
||
static const char PFX[] = "S\" MSG-TICK\" S\" ";
|
||
static const char SFX[] = "\" VM-EXEC";
|
||
char cmd[128];
|
||
size_t p = 0;
|
||
size_t name_len = strlen(ent.name);
|
||
if (name_len > VM_NAME_MAX - 1u) name_len = VM_NAME_MAX - 1u;
|
||
|
||
memcpy(cmd + p, PFX, sizeof(PFX) - 1u); p += sizeof(PFX) - 1u;
|
||
memcpy(cmd + p, ent.name, name_len); p += name_len;
|
||
memcpy(cmd + p, SFX, sizeof(SFX) - 1u); p += sizeof(SFX) - 1u;
|
||
cmd[p] = '\0';
|
||
|
||
vm_interpret(mama, cmd);
|
||
}
|
||
}
|
||
g_idle_pump_active = 0;
|
||
|
||
if (console_tx_count() == tx_before_idle) {
|
||
console_cancel_deferred_line_start();
|
||
}
|
||
}
|
||
|
||
/*===========================================================================
|
||
* FABRIC-0.md item 4.4v: keyboard-to-REPL bridge.
|
||
*
|
||
* Translates sk_key_event_poll()'s converged Linux-keycode-namespace
|
||
* stream (keyboard_words.c -- one implementation shared with KEY-EVENT,
|
||
* live-verified on all three architectures per item 4.3.5f) into the same
|
||
* byte stream sk_console_readline() already reads from console_getc(): -1 for
|
||
* "nothing ready", else a raw ASCII byte with '\n'/0x7F meaning the same
|
||
* thing they mean for the serial path below.
|
||
*
|
||
* Table covers exactly the keys a line editor needs -- letters, digits,
|
||
* the standard US-QWERTY punctuation row, space, enter, backspace, tab
|
||
* (for the Ctrl+TAB toggle interception, 4.4y/4.4u step 8) -- not full
|
||
* keyboard coverage. Keycodes are Linux input-event-codes.h values,
|
||
* confirmed against this build host's own header, not guessed (§25.0
|
||
* rule 4). Index 0 means "no mapping"; arrows/F-keys/etc. fall through
|
||
* unmapped and are silently dropped, consistent with this REPL's
|
||
* append/backspace-only editing model (4.4u: no mid-line cursor
|
||
* movement).
|
||
*===========================================================================*/
|
||
|
||
#define SK_KBD_TABLE_SIZE 98u /* highest keycode used below is KEY_RIGHTCTRL=97 */
|
||
|
||
static const char sk_kbd_unshifted[SK_KBD_TABLE_SIZE] = {
|
||
[2]='1',[3]='2',[4]='3',[5]='4',[6]='5',[7]='6',[8]='7',[9]='8',[10]='9',[11]='0',
|
||
[12]='-',[13]='=',
|
||
[16]='q',[17]='w',[18]='e',[19]='r',[20]='t',[21]='y',[22]='u',[23]='i',[24]='o',[25]='p',
|
||
[26]='[',[27]=']',
|
||
[30]='a',[31]='s',[32]='d',[33]='f',[34]='g',[35]='h',[36]='j',[37]='k',[38]='l',
|
||
[39]=';',[40]='\'',[41]='`',[43]='\\',
|
||
[44]='z',[45]='x',[46]='c',[47]='v',[48]='b',[49]='n',[50]='m',
|
||
[51]=',',[52]='.',[53]='/',
|
||
[57]=' ',
|
||
};
|
||
|
||
static const char sk_kbd_shifted[SK_KBD_TABLE_SIZE] = {
|
||
[2]='!',[3]='@',[4]='#',[5]='$',[6]='%',[7]='^',[8]='&',[9]='*',[10]='(',[11]=')',
|
||
[12]='_',[13]='+',
|
||
[16]='Q',[17]='W',[18]='E',[19]='R',[20]='T',[21]='Y',[22]='U',[23]='I',[24]='O',[25]='P',
|
||
[26]='{',[27]='}',
|
||
[30]='A',[31]='S',[32]='D',[33]='F',[34]='G',[35]='H',[36]='J',[37]='K',[38]='L',
|
||
[39]=':',[40]='"',[41]='~',[43]='|',
|
||
[44]='Z',[45]='X',[46]='C',[47]='V',[48]='B',[49]='N',[50]='M',
|
||
[51]='<',[52]='>',[53]='?',
|
||
[57]=' ',
|
||
};
|
||
|
||
#define SK_KEY_BACKSPACE 14u
|
||
#define SK_KEY_TAB 15u
|
||
#define SK_KEY_ENTER 28u
|
||
#define SK_KEY_LEFTSHIFT 42u
|
||
#define SK_KEY_RIGHTSHIFT 54u
|
||
#define SK_KEY_LEFTALT 56u
|
||
#define SK_KEY_RIGHTALT 100u
|
||
|
||
static int g_kbd_shift_down; /* zero-initialized (BSS) */
|
||
static int g_kbd_alt_down;
|
||
|
||
/* Drains and translates one physically-typed key. Modifier state persists
|
||
* across calls (a real keyboard's shift/alt state is global, not
|
||
* per-line). Alt+TAB is intercepted here and drives the graphics/text
|
||
* toggle directly (console_fb_toggle_graphics(), the same state-machine
|
||
* transition the ALT+TAB FORTH word calls) -- never reaches the line
|
||
* buffer as a character either way. */
|
||
static int sk_kbd_getc(void)
|
||
{
|
||
uint16_t keycode;
|
||
int pressed;
|
||
|
||
while (sk_key_event_poll(&keycode, &pressed)) {
|
||
if (keycode == SK_KEY_LEFTSHIFT || keycode == SK_KEY_RIGHTSHIFT) {
|
||
g_kbd_shift_down = pressed;
|
||
continue;
|
||
}
|
||
if (keycode == SK_KEY_LEFTALT || keycode == SK_KEY_RIGHTALT) {
|
||
g_kbd_alt_down = pressed;
|
||
continue;
|
||
}
|
||
if (!pressed) continue; /* only act on press/repeat */
|
||
|
||
if (keycode == SK_KEY_TAB) {
|
||
if (g_kbd_alt_down) console_fb_toggle_graphics();
|
||
continue; /* bare TAB: not mapped, same as arrows/F-keys */
|
||
}
|
||
if (keycode == SK_KEY_ENTER) return '\n';
|
||
if (keycode == SK_KEY_BACKSPACE) return 0x7F;
|
||
|
||
if (keycode < SK_KBD_TABLE_SIZE) {
|
||
char c = g_kbd_shift_down ? sk_kbd_shifted[keycode] : sk_kbd_unshifted[keycode];
|
||
if (c) return (unsigned char)c;
|
||
}
|
||
/* unmapped keycode -- drop and keep draining */
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
/* One raw byte from either input source (serial console or the keyboard-
|
||
* event bridge), non-blocking, -1 if neither has one ready right now. Not
|
||
* itself a FORTH word -- the shared byte-fetch underneath sk_console_getkey()/
|
||
* sk_console_key_available() (the standard dictionary's KEY/?TERMINAL, wired
|
||
* through shim.c's getchar()) and sk_console_readline() (QUERY/EXPECT, wired
|
||
* through shim.c's fgets()) alike. */
|
||
static int sk_console_getc_raw(void)
|
||
{
|
||
int c = console_getc();
|
||
if (c < 0) c = sk_kbd_getc(); /* FABRIC-0.md 4.4v: second source, same buffer */
|
||
return c;
|
||
}
|
||
|
||
/* One-byte pushback so sk_console_key_available() can peek without losing
|
||
* the byte -- ?TERMINAL must be non-destructive (a caller checks readiness,
|
||
* then still expects KEY to return that same key). */
|
||
static int g_console_pending_key = -1;
|
||
|
||
/* KEY's real body (shim.c's getchar() calls this): blocks until a key is
|
||
* available, servicing the heartbeat/idle loop while waiting -- same
|
||
* cadence sk_console_readline() already uses below, so a KEY call mid-word
|
||
* never stalls the heartbeat or Hera's own idle dispatch. No echo -- that's
|
||
* the caller's job, same as any standard KEY implementation. */
|
||
int sk_console_getkey(VM *active_vm)
|
||
{
|
||
for (;;) {
|
||
int c;
|
||
if (g_console_pending_key >= 0) {
|
||
c = g_console_pending_key;
|
||
g_console_pending_key = -1;
|
||
} else {
|
||
c = sk_console_getc_raw();
|
||
}
|
||
if (c >= 0) return c;
|
||
|
||
heartbeat_service();
|
||
uint64_t now = heartbeat_ticks();
|
||
if (now - g_last_beat_tick >= SK_IDLE_BEAT_INTERVAL) {
|
||
g_last_beat_tick = now;
|
||
sk_repl_idle(active_vm);
|
||
}
|
||
arch_relax();
|
||
}
|
||
}
|
||
|
||
/* ?TERMINAL's real body (sf_terminal_ready(), shim.c): non-blocking peek --
|
||
* a single poll, no idle-servicing loop (a false result must return
|
||
* immediately, not block). Buffers a found byte in g_console_pending_key so
|
||
* a following sk_console_getkey() returns the exact same key, not a
|
||
* different/later one. */
|
||
int sk_console_key_available(void)
|
||
{
|
||
if (g_console_pending_key >= 0) return 1;
|
||
int c = sk_console_getc_raw();
|
||
if (c >= 0) { g_console_pending_key = c; return 1; }
|
||
return 0;
|
||
}
|
||
|
||
/*===========================================================================
|
||
* sk_console_readline - line read from serial console with echo
|
||
*
|
||
* Non-blocking poll of console_getc(). While no character is ready the idle
|
||
* spin services the adaptive heartbeat at SK_IDLE_BEAT_INTERVAL tick cadence.
|
||
* Supports backspace (0x7F and \b) and ignores other control characters.
|
||
* Returns the number of characters placed in buf (not counting '\0').
|
||
*
|
||
* Public (declared in repl.h): shim.c's fgets()/QUERY's own real body call
|
||
* this directly -- same line-editing behavior for a mid-word EXPECT/QUERY as
|
||
* for the REPL's own top-level prompt, since it's the same underlying
|
||
* console. Any g_console_pending_key left over from a ?TERMINAL peek is
|
||
* consumed first so a line read never drops a byte ?TERMINAL already saw.
|
||
* @param reanchor_prompt nonzero from the REPL's own prompt sites (which
|
||
* print SK_PROMPT_TEXT immediately before): re-print the prompt whenever an
|
||
* idle bottom half wrote to the console while this call blocked at the bare
|
||
* prompt (see the re-anchor block in the idle branch). shim.c's fgets()
|
||
* passes 0 -- its prompt context is caller-owned.
|
||
*===========================================================================*/
|
||
|
||
int sk_console_readline(char* buf, int size, VM* active_vm, int reanchor_prompt)
|
||
{
|
||
int n = 0;
|
||
/* TX counter value right after the caller printed its prompt. Any
|
||
* console output that lands while this readline blocks (heartbeat
|
||
* status, sk_repl_idle()'s USB attach/detach chatter) pushes the
|
||
* counter past this mark and away from a bare prompt; when that
|
||
* happens, re-anchor the prompt (below). */
|
||
uint64_t prompt_tx_mark = console_tx_count();
|
||
|
||
buf[0] = '\0';
|
||
sk_cursor_show(); /* show the cursor at the bare prompt, before any input */
|
||
|
||
for (;;) {
|
||
int c;
|
||
if (g_console_pending_key >= 0) {
|
||
c = g_console_pending_key;
|
||
g_console_pending_key = -1;
|
||
} else {
|
||
c = sk_console_getc_raw();
|
||
}
|
||
|
||
if (c < 0) {
|
||
/* Service the heartbeat bottom half every idle iteration, not
|
||
* gated by SK_IDLE_BEAT_INTERVAL (item 0.8, FABRIC-0.md §26):
|
||
* heartbeat_service() drains at most one latched sample per
|
||
* call, so a coarse gate here would silently lose or merge
|
||
* samples between ISR-latched ticks. sk_repl_idle() below is
|
||
* a separate, deliberately coarser cadence for higher-level
|
||
* subsystem dispatch, unrelated to sample fidelity. */
|
||
heartbeat_service();
|
||
|
||
uint64_t now = heartbeat_ticks();
|
||
/* n == 0 gate: sk_repl_idle() opens with console_ensure_line_start(),
|
||
* closing off a dangling prompt line before any chatter it might
|
||
* print (xhci attach/detach, block-sync, MSG-TICK pump). Before the
|
||
* FABRIC-2.md §I.9 fix (2026-09-05), that newline was unconditional
|
||
* and immediate, so it fired on every elapsed SK_IDLE_BEAT_INTERVAL
|
||
* regardless of whether sk_repl_idle() actually had anything to
|
||
* print -- including mid-edit (n > 0, characters typed but Enter
|
||
* not yet pressed), visually snapping the in-progress line to a
|
||
* fresh blank one, indistinguishable from Enter having been
|
||
* pressed. console_ensure_line_start()'s newline is now deferred
|
||
* and self-cancelling when nothing follows it (console.c), which
|
||
* fixes that regardless of n -- but this gate is kept for its own,
|
||
* independent reason: deferring the *whole* idle beat while a line
|
||
* is being edited (same n > 0 guard the prompt reanchor below
|
||
* already uses) means a genuine xhci/block-sync/MSG-TICK event
|
||
* cannot interrupt output mid-line while the user is actively
|
||
* typing, only delaying that servicing by at most one more
|
||
* interval, which its own "coarse cadence, cheap early-exit"
|
||
* design already tolerates. */
|
||
if (n == 0 && now - g_last_beat_tick >= SK_IDLE_BEAT_INTERVAL) {
|
||
g_last_beat_tick = now;
|
||
sk_repl_idle(active_vm);
|
||
}
|
||
|
||
/* Blink the cursor while idle (no key ready this iteration),
|
||
* regardless of n -- a real terminal blinks whether sitting at
|
||
* a bare prompt or paused mid-edit. sk_cursor_show() (called
|
||
* from every deterministic draw site below and at entry) resets
|
||
* this cycle to "on" on every real keystroke, so typing never
|
||
* looks like it landed mid-blink. */
|
||
if (now - g_cursor_blink_tick >= SK_CURSOR_BLINK_INTERVAL) {
|
||
g_cursor_blink_tick = now;
|
||
g_cursor_visible = !g_cursor_visible;
|
||
if (g_cursor_visible) console_fb_draw_cursor();
|
||
else console_fb_erase_cursor();
|
||
}
|
||
|
||
/*
|
||
* Re-anchor the prompt (FABRIC-0.md 4.4a unified prompt: print
|
||
* only "ok> " here -- console_putc() auto-prefixes the current
|
||
* [VMName] on a fresh line). When an idle bottom half above
|
||
* pushed output past prompt_tx_mark, the console cursor is now
|
||
* below/after new lines and the "ok> " the caller printed has
|
||
* been scrolled or buried -- once the flood passes, the screen
|
||
* and serial log would end on a stale line with no prompt
|
||
* (FABRIC-2.md: the bare prompt must be the last thing shown
|
||
* while the REPL sits idle). Reprinting it restores that
|
||
* invariant. Skipped while a line is being edited (n > 0) so
|
||
* partial echo stays attached to its own prompt; shim.c's
|
||
* fgets() (QUERY/EXPECT/ACCEPT) calls in with reanchor_prompt
|
||
* == 0 for the same reason -- its prompt line is caller-owned
|
||
* text, not the REPL's. Each silent beat leaves the mark
|
||
* unchanged, so the final state after the chatter dies down is
|
||
* a fresh prompt on the last visible line, cursor on it.
|
||
*/
|
||
if (reanchor_prompt && n == 0 &&
|
||
console_tx_count() != prompt_tx_mark)
|
||
{
|
||
sk_print_prompt();
|
||
sk_cursor_show();
|
||
prompt_tx_mark = console_tx_count();
|
||
}
|
||
|
||
/*
|
||
* Do NOT use hlt here: QEMU single-threaded TCG can't process
|
||
* its APIC timer callbacks while the guest CPU is halted (the
|
||
* event loop and the TCG thread share the same OS thread).
|
||
* Interrupts are delivered at TB boundaries in a tight loop.
|
||
* On real hardware a wfi/hlt would be appropriate; add it here
|
||
* under an #ifdef REAL_HARDWARE guard when that path is needed.
|
||
*/
|
||
arch_relax(); /* PAUSE — reduce power, maintain tight poll */
|
||
continue;
|
||
}
|
||
|
||
if (c == '\r' || c == '\n') {
|
||
console_fb_erase_cursor(); /* leaving this cell without drawing a char over it */
|
||
console_putc('\n');
|
||
break;
|
||
}
|
||
|
||
/* backspace: DEL (0x7F) or BS (0x08) */
|
||
if ((c == 0x7F || c == '\b') && n > 0) {
|
||
n--;
|
||
buf[n] = '\0';
|
||
/* VT100 erase: move back, overwrite with space, move back again */
|
||
console_putc('\b');
|
||
console_putc(' ');
|
||
console_putc('\b');
|
||
sk_cursor_show();
|
||
continue;
|
||
}
|
||
|
||
if (c < 0x20) continue; /* ignore other control characters */
|
||
if (n >= size - 1) continue; /* buffer full — drop character */
|
||
|
||
buf[n++] = (char)c;
|
||
buf[n] = '\0';
|
||
console_putc((char)c); /* echo */
|
||
sk_cursor_show();
|
||
}
|
||
|
||
buf[n] = '\0';
|
||
return n;
|
||
}
|
||
|
||
/*===========================================================================
|
||
* sk_repl - FORTH REPL
|
||
*
|
||
* FABRIC-2.md §F.20/§F.21 (2026-08-28): the unauthenticated emergency-CLI
|
||
* ACL bypass this REPL used to grant itself on Hera's own bare prompt is
|
||
* retired -- every word runs under ordinary ACL enforcement here now,
|
||
* console identity included. emergency_console still exists as a field
|
||
* (vm.h) and is still set, briefly, by the genuine C-level VM fault
|
||
* handler (EMERGENCY_CONSOLE_ENABLED build flag) for crash recovery --
|
||
* that's a distinct, narrower mechanism this REPL no longer touches.
|
||
*
|
||
* Mirrors vm_repl() from src/repl.c:
|
||
* - Reads a line via sk_console_readline (non-blocking, heartbeat-serviced)
|
||
* - Calls vm_interpret
|
||
* - Prints " ok" or " ERROR"
|
||
* - When EMERGENCY_CONSOLE_ENABLED=1: resets vm->error and loops (recovery)
|
||
* - When EMERGENCY_CONSOLE_ENABLED=0: halts VM on error (no fallthrough surface)
|
||
*===========================================================================*/
|
||
|
||
#if !EMERGENCY_CONSOLE_ENABLED
|
||
static void sk_fault_handler(VM *vm) {
|
||
console_println("VM fault — emergency console disabled; halting");
|
||
vm->halted = 1;
|
||
}
|
||
#endif
|
||
|
||
/*===========================================================================
|
||
* sk_repl_dispatch_line - console-VM + user-VM pair relay (FABRIC-2.md
|
||
* Phase F, 2026-08-28).
|
||
*
|
||
* If `vm`'s own registered name has a live "<name>~user" counterpart,
|
||
* this is a console session: relay the raw line as a real, async
|
||
* CONSOLE-CMD-EVENT message (common:messaging.4th) instead of
|
||
* interpreting it directly -- "every line is a message," not a
|
||
* C-level redirect. This is one particular consumer of the general
|
||
* VM-to-VM messaging system built in Phase C: any VM can already
|
||
* MSG-SEND to any other VM for its own reasons regardless of a human
|
||
* ever being at a physical console at all; this hook only wires the
|
||
* physical-terminal-input path into that same general mechanism, it
|
||
* doesn't gate or replace it.
|
||
*
|
||
* Falls back to direct vm_interpret() (today's unchanged behavior) when
|
||
* there's no live paired user VM, or when the line contains a `"`
|
||
* character this simple S"-embedding can't safely carry yet (a known
|
||
* v1 limitation -- warned about, not silently mishandled).
|
||
*===========================================================================*/
|
||
|
||
/* USE (FABRIC-2.md §F.24) is a REPL-control word, not a command for
|
||
* whatever VM happens to be paired to a console -- it must always run
|
||
* on the active VM directly, never get relayed as a message. Real
|
||
* FORTH syntax always puts USE last (S" name" USE), so a trailing-
|
||
* token match is a reliable, non-tokenizing-required check: trim
|
||
* trailing whitespace, then confirm the line ends with "USE" as its
|
||
* own word (preceded by whitespace or the whole line). */
|
||
static int sk_repl_line_calls_use(const char *input)
|
||
{
|
||
size_t len = strlen(input);
|
||
while (len > 0 && (input[len - 1] == ' ' || input[len - 1] == '\t')) len--;
|
||
if (len < 3) return 0;
|
||
if (input[len - 3] != 'U' || input[len - 2] != 'S' || input[len - 1] != 'E') return 0;
|
||
return (len == 3) || (input[len - 4] == ' ' || input[len - 4] == '\t');
|
||
}
|
||
|
||
static void sk_repl_dispatch_line(VM *vm, const char *input)
|
||
{
|
||
/* H1 reentrancy guard: while this dispatched line executes on Hera
|
||
* herself, sk_repl_idle() must defer its MSG-TICK pump -- calling
|
||
* vm_interpret(mama, ...) from inside a mid-line KEY/EXPECT would
|
||
* re-enter mama's interpreter and clobber its in-flight input buffer
|
||
* (see the guard's comment at sk_repl_idle()). A child VM's console
|
||
* turn leaves mama idle, so the pump stays safe there and the guard is
|
||
* only latched for Hera. */
|
||
int on_mama = (vm == (VM *)sk_get_mama_vm());
|
||
int saved = g_mama_interpreting;
|
||
if (on_mama) g_mama_interpreting = 1;
|
||
|
||
if (sk_repl_line_calls_use(input)) {
|
||
vm_interpret(vm, input);
|
||
goto out;
|
||
}
|
||
const char *vn = console_get_vm_name();
|
||
if (vn) {
|
||
char paired_name[VM_NAME_MAX + 8];
|
||
size_t vnlen = strlen(vn);
|
||
if (vnlen + 6 <= sizeof(paired_name)) {
|
||
memcpy(paired_name, vn, vnlen);
|
||
memcpy(paired_name + vnlen, "~user", 6); /* includes NUL */
|
||
|
||
VMRegistryEntry paired;
|
||
if (capsule_vm_find_by_name(paired_name, &paired) == 0 &&
|
||
paired.state == VM_STATE_LIVE) {
|
||
|
||
if (strchr(input, '"')) {
|
||
console_println("console: line contains '\"' -- can't relay "
|
||
"as a message safely yet, interpreting directly");
|
||
} else {
|
||
char cmd[INPUT_BUFFER_SIZE + 64];
|
||
/* to-index 3: the fixed convention this console's own
|
||
* VM-NAME-REG entry for its paired user VM uses (set
|
||
* once at pairing time -- see the pairing word). */
|
||
int n = snprintf(cmd, sizeof(cmd),
|
||
"CONSOLE-CMD-EVENT 0 3 S\" %s\" 0 MSG-SEND", input);
|
||
if (n > 0 && (size_t)n < sizeof(cmd)) {
|
||
vm_interpret(vm, cmd);
|
||
goto out;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
vm_interpret(vm, input);
|
||
|
||
out:
|
||
g_mama_interpreting = saved;
|
||
}
|
||
|
||
/*===========================================================================
|
||
* sk_repl_step - Execute one REPL turn on a VM and return.
|
||
*
|
||
* Prints the VM's prompt, reads one input line, interprets it, prints
|
||
* ok/ERROR, then returns. Used by the Compudynamics VM-STEP primitive
|
||
* so Hera can give a single REPL quantum to any child VM without
|
||
* surrendering control for the full sk_repl_run() loop.
|
||
*
|
||
* Returns 1 if the VM is still running, 0 if it halted during this turn.
|
||
*===========================================================================*/
|
||
|
||
int sk_repl_step(VM *vm)
|
||
{
|
||
char input[INPUT_BUFFER_SIZE]; /* FABRIC-0.md 4.4w: matches the strip's input width */
|
||
|
||
if (!vm || vm->halted) return 0;
|
||
|
||
{
|
||
/* Unified prompt (FABRIC-0.md 4.4a): console_putc()'s existing per-line
|
||
* "[VMName] " prefix (console.c, g_active_vm_name) already supplies the
|
||
* bracket -- print only "ok> " here, don't build a second one.
|
||
* emergency_console is no longer set from here (FABRIC-2.md §F.20/
|
||
* §F.21: the emergency-CLI ACL bypass is retired) -- it's driven
|
||
* only by the genuine C-level fault handler now (vm.c's own
|
||
* emergency-fault-recovery use, EMERGENCY_CONSOLE_ENABLED). Every
|
||
* word run from this REPL, Hera's bare prompt included, goes
|
||
* through ordinary ACL enforcement. FABRIC-0.md 4.4s (2026-09-04):
|
||
* sk_print_prompt() extends this with a "(user)" segment when an
|
||
* identity is attached -- see its own doc comment. */
|
||
sk_print_prompt();
|
||
}
|
||
|
||
sk_console_readline(input, sizeof(input), vm, 1);
|
||
|
||
if (input[0] == '\0') {
|
||
console_puts(" ok\n");
|
||
return vm->halted ? 0 : 1;
|
||
}
|
||
|
||
sk_repl_dispatch_line(vm, input);
|
||
|
||
/* ABORT stops mid-line but leaves the flag set for the caller to
|
||
* consume -- this REPL step is that boundary. Clear it here so the
|
||
* next line isn't silently refused by vm_interpret's own check. */
|
||
vm->abort_requested = 0;
|
||
|
||
if (vm->error) {
|
||
console_puts(" ERROR\n");
|
||
vm->error = 0;
|
||
} else {
|
||
console_puts(" ok\n");
|
||
}
|
||
|
||
return vm->halted ? 0 : 1;
|
||
}
|
||
|
||
void sk_repl_run(VM *vm)
|
||
{
|
||
char input[INPUT_BUFFER_SIZE]; /* FABRIC-0.md 4.4w: matches the strip's input width */
|
||
VM *active;
|
||
|
||
vm->halted = 0;
|
||
|
||
while (!vm->halted) {
|
||
/* USE may redirect input to a different VM each iteration */
|
||
active = g_repl_active_vm ? g_repl_active_vm : vm;
|
||
|
||
/* Unified prompt (FABRIC-0.md 4.4a): console_putc()'s existing per-line
|
||
* "[VMName] " prefix (console.c, g_active_vm_name) already supplies the
|
||
* bracket -- print only "ok> " here, don't build a second one.
|
||
* emergency_console is no longer set from here (FABRIC-2.md §F.20/
|
||
* §F.21: the emergency-CLI ACL bypass is retired) -- see sk_repl_
|
||
* step()'s matching comment above. FABRIC-0.md 4.4s (2026-09-04):
|
||
* sk_print_prompt() extends this with a "(user)" segment. */
|
||
sk_print_prompt();
|
||
|
||
sk_console_readline(input, sizeof(input), active, 1);
|
||
|
||
if (input[0] == '\0') {
|
||
console_puts(" ok\n");
|
||
continue;
|
||
}
|
||
|
||
sk_repl_dispatch_line(active, input);
|
||
|
||
/* ABORT stops mid-line but leaves the flag set for the caller to
|
||
* consume -- this REPL step is that boundary. Clear it here so the
|
||
* next line isn't silently refused by vm_interpret's own check. */
|
||
active->abort_requested = 0;
|
||
|
||
if (active->error) {
|
||
console_puts(" ERROR\n");
|
||
active->error = 0;
|
||
} else {
|
||
console_puts(" ok\n");
|
||
}
|
||
}
|
||
}
|
||
|
||
void sk_repl(VM *vm)
|
||
{
|
||
/* FABRIC-0.md item 4.4j: boot and POST (both already returned by the time
|
||
* sk_repl() is called) stay on font_8x16.c/VT100 by design; the
|
||
* interactive REPL -- this function -- is the boundary where TTF-TEXT
|
||
* takes over. One-shot: console_fb_enable_ttf() no-ops on any later
|
||
* call. */
|
||
console_fb_enable_ttf();
|
||
|
||
console_println(lithos_version);
|
||
console_puts("StarForth Version "); console_println(STARFORTH_VERSION);
|
||
console_println("");
|
||
console_println("StarForth Emergency CLI");
|
||
console_println("FORTH-79 interpreter — type BYE or power off to exit");
|
||
console_println("");
|
||
|
||
sk_repl_run(vm);
|
||
}
|