Initial commit: Schunix as it stands before the SchOS rename
An x86-64 operating system built from xv6, now largely rewritten: SMP, a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF rasteriser, and a Linux-numbered syscall ABI. No history before this point -- the tree was never under version control. This commit exists so the rename that follows has something to undo to.
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NOTICE
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NOTICE
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Schunix
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Copyright 2026 Nexoniarz
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This product includes software developed as part of the Schunix project,
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licensed under the Apache License, Version 2.0. See LICENSE.
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================================================================================
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Third-party software
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================================================================================
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Schunix incorporates and redistributes software written by others. Their
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licences apply to their code and are NOT superseded by the Schunix licence.
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A built Schunix image contains binaries derived from all of the following.
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--------------------------------------------------------------------------------
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xv6-x86_64 / xv6 MIT License
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--------------------------------------------------------------------------------
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Copyright (c) 2006-2019 Frans Kaashoek, Robert Morris, Russ Cox,
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Massachusetts Institute of Technology CSAIL
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The Schunix kernel is a derivative work of xv6. Substantial portions of
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kernel/ -- notably the process, trap, virtual memory, buffer cache and v1
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filesystem code -- descend from it, however heavily rewritten. The MIT licence
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requires that this notice be preserved in all copies; see LICENSE.MIT.
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--------------------------------------------------------------------------------
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musl libc 1.2.5 MIT License
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--------------------------------------------------------------------------------
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Copyright (c) 2005-2020 Rich Felker and contributors
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Built from ports/musl. Provides the C library every userland program links
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against. See the extracted source's COPYRIGHT file for the full contributor
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list, which the MIT terms require be carried along with binaries.
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--------------------------------------------------------------------------------
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toybox 0.8.12 Zero-Clause BSD (0BSD)
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--------------------------------------------------------------------------------
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Copyright (c) 2006-2024 Rob Landley and contributors
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Built from ports/toybox. Supplies the standard command set in /bin. 0BSD
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imposes no attribution requirement at all; this entry is courtesy, not
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obligation.
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--------------------------------------------------------------------------------
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mksh R59c MirOS Licence
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--------------------------------------------------------------------------------
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Copyright (c) 2002-2023 Thorsten Glaser and contributors
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Portions derived from the Public Domain Korn Shell (pdksh)
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Built from ports/mksh. Supplies /bin/sh. The MirOS Licence is permissive and
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requires the copyright notice be retained.
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--------------------------------------------------------------------------------
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Intel 8254x device identifiers BSD 3-Clause
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--------------------------------------------------------------------------------
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Copyright (c) 2001-2020, Intel Corporation
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All rights reserved.
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The PCI device IDs in include/e1000.h are transcribed from FreeBSD's
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sys/dev/e1000/e1000_hw.h, which carries the Intel 3-clause BSD licence above
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(verified: no advertising clause). Only the identifier constants are used --
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data, not implementation. kernel/drivers/net/e1000/e1000.c is written from
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Intel's public manual 317453 and contains no FreeBSD or Intel driver code.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the conditions of the 3-clause BSD
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licence are met, including retention of this notice and the disclaimer, and
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that neither the name of Intel Corporation nor the names of its contributors
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are used to endorse or promote products derived from this software without
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specific prior written permission.
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--------------------------------------------------------------------------------
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usb.ids -- USB vendor and product database BSD 3-Clause (dual-licensed)
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--------------------------------------------------------------------------------
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Maintained by Stephen J. Gowdy <linux.usb.ids@gmail.com>
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http://www.linux-usb.org/usb.ids
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Distributed by its maintainer under the terms of *either* the GNU General
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Public License version 2 or later, *or* the 3-clause BSD Licence. Schunix takes
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the BSD option; the GPL option is not exercised and could not be, since
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Apache-2.0 and GPL-2.0-only cannot be combined (see docs/licensing.md section
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2).
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Shipped verbatim as /usr/share/usb.ids. Cached in dist/ and refreshed with
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`make usb-ids`, never automatically -- the version and date are in the file's
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own header, so what shipped is always knowable.
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--------------------------------------------------------------------------------
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Roboto Apache-2.0
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--------------------------------------------------------------------------------
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Copyright the Roboto Project Authors (https://github.com/googlefonts/roboto)
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Shipped as /usr/share/fonts/Roboto-Regular.ttf, from ports/Roboto. Licensed
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under Apache-2.0 -- the same licence as Schunix itself, so it carries no
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obligation beyond this notice. Intended for the desktop, window manager and
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compositor.
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--------------------------------------------------------------------------------
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JetBrains Mono SIL OFL 1.1
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--------------------------------------------------------------------------------
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Copyright 2020 The JetBrains Mono Project Authors
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(https://github.com/JetBrains/JetBrainsMono)
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Shipped as /usr/share/fonts/JetBrainsMono-Regular.ttf, from ports/JetBrains_Mono
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(full licence text at ports/JetBrains_Mono/OFL.txt). Intended for the terminal
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and TTY.
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Under the SIL Open Font License 1.1 the font remains under OFL even inside this
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Apache-2.0 system -- that does not reach any other part of Schunix -- and it may
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not be sold on its own. Bundling it with an operating system is expressly
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permitted. JetBrains Mono declares no Reserved Font Name, so a modified version
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(a pre-rasterised bitmap, for instance) may keep the name.
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--------------------------------------------------------------------------------
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"New File System For XV6" MIT License
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--------------------------------------------------------------------------------
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Copyright (c) Qi Ma, Leyi Pan, Ao Sun, Peiran Xu
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kernel/fs/fs.c and parts of tools/mkfs.c derive from this project, which extends
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xv6's file system with features Schunix still uses today:
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- the HTree hashed directory index (BKDRHash, HASHRANGE, the primary/overflow
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bucket layout), after Daniel Phillips, "A Directory Index for EXT2",
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5th Annual Linux Showcase & Conference, 2001
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- Ext4-style extents (T_EXTENT)
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- the inode bitmap
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- symbolic links, file permissions, lseek and append
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Licensed under the MIT License, which permits this use and requires that the
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copyright notice and permission notice be retained. This entry is that
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retention; it was missing until 2026-08-09 and is recorded here regardless of
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what happens to the code, because the obligation attaches to every copy already
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made.
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Distinct from xv6 itself (LICENSE.MIT), which this project in turn derives from.
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================================================================================
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The build downloads upstream tarballs into dist/ and applies the patches in
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ports/<name>/patches/. Nothing in ports/ is Schunix code; do not add first-party
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work there. See docs/layout.md.
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Licence questions -- what may be copied in, what may never be, and how to check
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a NetBSD file's clause before using it -- are worked through in
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docs/licensing.md.
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