Robert Allan JamesandClaude Sonnet 5
57ac3fc304
Second stage of the preemptive context-switching plan. Every VM (Hera, every capsule_birth_baby()-born VM including WIREBIND identities) now gets its own dedicated 2 MiB native C stack at birth -- but nothing runs on it yet, that's Stage 2. Pure allocation-machinery proof. Design correction made before writing code: the plan called for cloning sk_vm_arena_alloc()'s guard-page pattern, but that pattern turns out to be Mama-only -- host_services.c's kernel_alloc() gives every baby VM a plain kmalloc() block for its dictionary arena, not a real guarded PMM allocation. Stacks get the real treatment instead (new sk_vm_native_stack_alloc()/_free() in arena.c): independent pmm_alloc_contiguous() + guard pages for every VM without exception, no singleton, no kmalloc fallback -- a stack overflow is exactly the failure mode guard pages exist for, and a corrupted stack could corrupt whatever saved context Stage 2 trusts. 2 MiB size matches this project's own established kernel-stack convention (g_kernel_stack/g_rpi5_native_stack), not a guess -- that one shared 2 MiB stack today already carries all VMs' combined nested VM-EXEC recursion. Three new VM struct fields, freed in vm_cleanup() alongside the existing call_stack free. Allocation failure is non-fatal to birth. All 3 architectures re-verified clean boot to ok>, no native-stack allocation failures for any Tripod-fleet VM. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016UNhH1mhi52i6Qihh7ZV5S
include/
Public headers for the hosted StarForth VM (src/). Kernel-only headers
live under include/starkernel/.
Core VM
vm.h— theVMstruct and all core types (DictEntry,DictPhysics, stacks, dictionary state); the central header most other files include.vm_api.h— external VM API surface.vm_host.h,vm_debug.h,startup.h,version.h— host integration, debug utilities, startup sequencing, version string.cli.h,repl.h,io.h,log.h— CLI parsing, REPL loop, I/O, logging.word_registry.h— word registration system shared by everysrc/word_source/*.cfile.compudynamics.h— the generic compudynamics module: tuning-word/config lookups (cd_tuning_word(),cd_tuning_vm()) consumed byssm_jacquard.c.
Memory / blocks
memory_management.h,dictionary_management.h— dictionary allocator and search.block_subsystem.h,blkcfg.h,blkio.h,blkio_factory.h— logical→ physical block mapper and pluggable block I/O backends (file/RAM).platform_alloc.h,platform_lock.h,platform_time.h— platform abstraction shims (hosted vs. kernel allocation/locking/timing).
Physics-driven adaptive runtime (7 feedback loops)
physics_runtime.h— main physics coordinator.physics_hotwords_cache.h— Loop #1, execution-heat hot-words cache.physics_metadata.h— per-wordDictPhysicsmetadata tracking.physics_pipelining_metrics.h— Loop #4, word-transition prediction.physics_execution_hooks.h— execution instrumentation hook points.rolling_window_of_truth.h,rolling_window_knobs.h— Loop #2 circular execution-history buffer and its tuning knobs.inference_engine.h— Loops #5/#6, window-width and decay-slope statistical inference.dictionary_heat_optimization.h— Loop #1 heat counters.ssm_jacquard.h— L8 Jacquard steady-state mode selector.doe_metrics.h— Design of Experiments (2^7 factorial) metrics.profiler.h— performance profiling hooks.
Arithmetic / codegen
q48_16.h— Q48.16 deterministic fixed-point arithmetic (used instead of IEEE-754 float specifically to keep cross-architecture behavior bit-identical).math_portable.h— portable math helpers.arch_detect.h,starforth_config.h— architecture detection and the build-flag fallback-default layer (used when a.cfile is compiled by hand withoutmake).vm_asm_opt.h,vm_asm_opt_arm64.h,vm_asm_opt_riscv64.h,vm_inner_interp_asm.h,vm_inner_interp_arm64.h,vm_inner_interp_riscv64.h— per-architecture assembler-optimized inner interpreter (USE_ASM_OPT=1).
See include/starkernel/README.md for the bare-metal kernel headers.