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Markus Maiwald 5c3a8e3713 feat(rumpk): Pure Zig libc stubs - Freestanding Doctrine
THE GHOST IN THE MACHINE IS EXORCISED
======================================

Rumpk now builds with ZERO C source files.
All libc functions are implemented in pure Zig.

WHAT CHANGED
------------
- NEW: hal/stubs.zig - Pure Zig libc implementation
  - memcpy, memset, memmove, memcmp
  - strlen, strcmp, strcpy
  - malloc, free, realloc, calloc (bump allocator)
  - printf, puts, putchar (route to UART)
  - exit, abort (halt CPU)
  - signal, raise (no-op stubs)

- REMOVED: core/cstubs.c dependency from build
  - C code is now only Nim's generated IR

- UPDATED: kernel.nim
  - Removed malloc/free/realloc exports
  - Now imports from Zig stubs

- UPDATED: build.sh
  - Compiles hal/stubs.zig separately
  - Links stubs.o with hal.o and nimcache/*.o

DOCTRINE DOCUMENT
-----------------
- .agents/steering/FREESTANDING-DOCTRINE.md
  - Codifies the 'Pure Zig ABI' principle
  - Documents build requirements
  - Lists all exported symbols

VERIFICATION
------------
$ file build/rumpk.elf
ELF 64-bit LSB executable, ARM aarch64, statically linked

$ qemu-system-aarch64 -M virt -kernel build/rumpk.elf
[Rumpk L0] Zig HAL Initialized
[Rumpk L1] Nim Kernel Alive!
[Rumpk L1] The Rubicon is crossed.
[Rumpk L1] Zig + Nim = Sovereign Metal.

This proves:
- POSIX is optional
- GCC is optional
- glibc/musl is optional
- We are the standard library now
2025-12-31 20:18:47 +01:00
.zig-cache feat(rumpk): Pure Zig libc stubs - Freestanding Doctrine 2025-12-31 20:18:47 +01:00
boot feat(rumpk): First successful Zig+Nim boot on QEMU ARM64 2025-12-31 20:18:47 +01:00
core feat(rumpk): Pure Zig libc stubs - Freestanding Doctrine 2025-12-31 20:18:47 +01:00
hal feat(rumpk): Pure Zig libc stubs - Freestanding Doctrine 2025-12-31 20:18:47 +01:00
io feat: Initialize Rumpk Modular Unikernel 2025-12-31 20:18:47 +01:00
README.md feat: Initialize Rumpk Modular Unikernel 2025-12-31 20:18:47 +01:00
build.sh feat(rumpk): Pure Zig libc stubs - Freestanding Doctrine 2025-12-31 20:18:47 +01:00
build.zig feat: Initialize Rumpk Modular Unikernel 2025-12-31 20:18:47 +01:00
run.sh feat(rumpk): First successful Zig+Nim boot on QEMU ARM64 2025-12-31 20:18:47 +01:00

README.md

Rumpk: The Modular Unikernel

"The Kernel is a Library. The App is the OS."

Status: EXPERIMENTAL
Languages: Zig (L0) + Nim (L1)
Design: POSIX-hostile, Military-grade

Directory Structure

rumpk/
├── boot/           [L0] Entry & Architecture (Zig/Asm)
│   ├── start.S     Multiboot2/EFI entry point
│   └── arch/       Architecture-specific code
├── hal/            [L0] Hardware Abstraction (Zig)
│   ├── mm.zig      Physical/Virtual Memory
│   ├── irq.zig     Interrupt handling
│   ├── serial.zig  UART/Early logging
│   └── abi.zig     C-ABI export to Nim
├── core/           [L1] Logic (Nim)
│   ├── kernel.nim  kmain() entry
│   ├── sched.nim   LWKT Scheduler
│   ├── fiber.nim   Fiber/Context management
│   └── ring.nim    Disruptor buffer
├── sys/            [L2] ABI Glue
│   └── syscall.zig System call handlers
├── payload/        [L3] NPL/NPK Loaders
│   └── loader.nim  Signature verification
└── io/             I/O Subsystem
    └── governor.nim Adaptive War/Peace mode

Key Features

  • Adaptive I/O: War Mode (polling) ↔ Peace Mode (interrupts)
  • Disruptor Ring: Lock-free inter-fiber communication
  • SipHash IDs: Collision-resistant process identification
  • Ed25519: Only signed code executes

Specifications

Build (Coming Soon)

cd core/rumpk
zig build          # Build L0 HAL
nimble build       # Build L1 Logic