d0f7acf9eb
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.
145 lines
7.4 KiB
Text
145 lines
7.4 KiB
Text
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licences apply to their code and are NOT superseded by the Schunix licence.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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