Interim OS is a radical new operating system with a focus on minimalism. It steals conceptually from Lisp machines (language-based kernel) and Plan 9 (everything is a file system). It boots to a JITting Lisp-like REPL and offers the programmer/user the system's resources as filesystems.
Interim runs on:
Raspberry Pi 2 (Broadcom VideoCore4/ARMv7, Bare Metal)
ARM5+ Linux (Hosted)
Intel/AMD x64 Linux, Mac OS X (Hosted)
Intel/AMD x86 Linux, Windows (Hosted, win32 .exe cross compiled from Linux)
Motorola 68020+ Amiga OS 3.x+ (Hosted)
Detailed docs are in docs/index.html.
Contact / FAQ / Get Involved
The official IRC channel for development and usage questions is #interim on irc.libera.chat.
Layer 0: Platform Interface (Startup code and filesystems)
Design Choices
The shell is the editor is the REPL is the language is the compiler.
Namespacing allows sandboxing and network transparency.
You need only one text encoding: UTF-8.
All facilities must be navigable by keyboard.
Building
Get the dependencies. For a (Linux-)hosted version, this is only GCC and SDL1 or SDL2 if you want windowed graphics. Sledge can also use /dev/fb0 instead if available on your platform. If you want to cross-compile for an ARM platform, get arm-none-eabi-gcc and libnewlib-arm-none-eabi.
1b. For a hosted version on Mac OS X, you will need GNU binutils, which can be obtained via homebrew: brew install binutils. You can also get SDL2 via homebrew.
To build the hosted variant, cd to sledge and ./build_x64.sh.
To cross-compile for bare metal, use ./rpi2-build.sh. This will create build/interim-arm.elf.
Running (Hosted)
bash
cd sledge
./sledge
To launch the graphical REPL/Shell:
./sledge USB cable to another computer and use it to control Interim.
Roadmap
IEEE 754 double-precision floating point numbers.
Vectors.
Native string maps (dictionaries) based on the existing sd_hash.
JavaScript to Interim Lisp compiler.
Licenses
Interim OS: GNU GPLv3 or later, (C) 2015-2016 Lukas F. Hartmann / @mntmn
Interim OS is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
newlib: GNU GPLv2, Maintained by Corinna Vinschen, Jeff Johnston / Red Hat Inc.
devices/rpi2/uspi: GNU GPLv3, Copyright (C) 2014-2015 R. Stange
devices/rpi2/rpi-boot: Copyright (C) 2013 by John Cronin
devices/rpi2/mmu.c for Raspberry Pi 2 adapted from code Copyright (C) 2015 by Goswin von Brederlow, GNU GPLv3+
devices/rpi2/fat FAT file system module Copyright by (C) 2013 by ChaN, Free Software / Custom License
GNU Unifont: GNU GPLv2+, originally by Roman Czyborra
devices/imx233 IMX233 Port contains code from U-Boot, GPLv2+, written by various engineers. See license headers in source files.
Codecs
minimp3: GNU LGPL, Copyright (C) 2001, 2002 Fabrice Bellard, (C) 2007 Martin J. Fiedler
uPNG: zlib License, Copyright (C) 2005-2010 Lode Vandevenne, (C) 2010 Sean Middleditch
NanoJPEG: KeyJ's Research License, Copyright (C) 2014 Martin J. Fiedler