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4 Commits

Author SHA1 Message Date
Markus Maiwald fbb9189b59 fix(rumpk): enable user stack access and repair boot process 
- Enabled SUM (Supervisor Access to User Memory) in riscv_init to allow kernel loader to write to user stacks.
- Removed dangerous 'csrc sstatus' in kload_phys that revoked access.
- Aligned global fiber stacks to 4096 bytes to prevent unmapped page faults at stack boundaries.
- Restored 'boot.o' linking to fix silent boot failure.
- Implemented 'fiber_can_run_on_channels' stub to satisfy Membrane linking.
- Defined kernel stack in header.zig to fix '__stack_top' undefined symbol.
- Resolved duplicate symbols in overrides.c and nexshell.
 2026-01-08 21:38:14 +01:00
Markus Maiwald df24fbe89d feat(tinybox): graft toybox integration and build system automation 
- Integrated ToyBox as git submodule
- Added src/nexus/builder/toybox.nim for automated cross-compilation
- Updated InitRD builder to support symlinks
- Refactored Kernel builder to fix duplicate symbol and path issues
- Modified forge.nim to orchestrate TinyBox synthesis (mksh + toybox)
- Updated SPEC-006-TinyBox.md with complete architecture
- Added mksh binary to initrd graft source
 2026-01-08 21:18:08 +01:00
Markus Maiwald 46e7be6837 feat(rumpk): Phase 7 Verified - Subject Zero Launch 
- Implemented Sovereign Syscall Table at 0x801FFF00
- Added cooperative yielding (s_yield) for Guest/Kernel concurrency
- Initialized Guest RX Ring and flows in Kernel
- Bridged LwIP in Guest via net_glue and ion_client overrides
- Validated TCP handshake and data transmission (Subject Zero -> Host)
- Confirmed 'Hello from the Membrane!' via UART and Network
 2025-12-31 20:18:48 +01:00
Markus Maiwald 3b755cac06 feat(rumpk): First successful Zig+Nim boot on QEMU ARM64 
THE RUBICON IS CROSSED
======================

Rumpk v0.1 successfully boots on QEMU ARM64 virt machine.
Zig L0 initializes HAL and hands off to Nim L1.

BOOT OUTPUT
-----------
[Rumpk L0] Stack: 16KB @ stack_bytes
[Rumpk L0] UART: 0x09000000 (QEMU virt)
[Rumpk L0] Handing off to Nim L1...
[Rumpk L1] Memory: ARC (Deterministic)
[Rumpk L1] POSIX: None (Hostile)
[Rumpk L1] Status: OPERATIONAL
[Rumpk L1] The Rubicon is crossed.
[Rumpk L1] Zig + Nim = Sovereign Metal.

IMPLEMENTATION
--------------
Layer 0 (Zig):
- hal/main.zig: Naked _start, stack setup, zig_entry
- hal/uart.zig: PL011 UART driver for QEMU virt

Layer 1 (Nim):
- core/kernel.nim: kmain() entry, FFI imports from Zig
- Compiled with --mm:arc --os:any for freestanding

Glue (C Stubs):
- core/include/: string.h, stdio.h, stdlib.h, signal.h, etc.
- core/cstubs.c: memcpy, memset, strlen, printf, exit stubs
- Provides minimal libc for Nim's generated C code

Build System:
- build.sh: Orchestrates Zig build-obj + Nim c + zig cc link
- run.sh: QEMU launch script
- boot/linker.ld: ARM64 linker script at 0x40080000

VERIFICATION
------------
$ qemu-system-aarch64 -M virt -cpu cortex-a57 -nographic -kernel build/rumpk.elf
→ Successfully prints L0 and L1 banners
→ Enters idle loop (wfi instruction)

NEXT STEPS
----------
Phase 2: Simple bump allocator for Nim heap
Phase 3: Two-fiber context switch (Ping/Pong)
Phase 4: NPL loading with Ed25519 verification
Phase 5: VisionFive 2 RISC-V hardware boot

This proves: POSIX is optional. GCC is optional. Zig + Nim = Sovereign Metal.
 2025-12-31 20:18:47 +01:00