eris

Barebone x86_64 kernel written in C++23. Nothing much

Writing a module

#include <eris/module.hpp>

namespace {

int my_init() { return 0; }
void my_exit() {}

}

ERIS_MODULE("mymod", "0.1", "you", "GPL-2.0-only", my_init, my_exit, "vga");

Build and run

make
make run          # VGA window plus serial on stdout
make run-serial   # serial only
make iso          # needs grub2-mkrescue and xorriso

License

GPL-2.0-only. Copyright (C) 2026 farfromoffice. LICENSE holds the license text verbatim, NOTICE holds the filled in copyright notice, and every source file carries an SPDX tag.

Contributing

CONTRIBUTING.md for the workflow, MAINTAINERS for who looks after which subsystem, CODE_OF_CONDUCT.md for how threads are expected to read, CREDITS for who has worked on this.

Not a goal

eris has no networking and will not get any: no drivers, no stack, no sockets, no remote access, nothing that phones home. Data comes in on a disk image and leaves the same way.

Roadmap

ROADMAP.md compares the tree against kernels that already went this way and lays out the phases, from surviving a fault to loadable modules and userspace.