# 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

- [SPEC-008: Architecture](/.agents/specs/SPEC-008-RUMPK-ARCHITECTURE.md)
- [SPEC-009: I/O Subsystem](/.agents/specs/SPEC-009-RUMPK-IO.md)
- [SPEC-010: Sovereign Hierarchy](/.agents/specs/SPEC-010-SOVEREIGN-HIERARCHY-V2.md)

## Build (Coming Soon)

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