Our code is hosted at Github:
NOTE: The Rigel tools are known to work well out of the box on Ubuntu versions 8.04 and later on 32- and 64-bit x86. Our dependency on x86 is very minimal (a few lines of inline assembly in the simulator) and can be worked around quickly. Other Linux distributions should work well too, but aren't explicitly supported yet, as we don't have test machines for them. Most things work out of the box on FreeBSD 9, but a small amount of manual tweaking in the build scripts may be required. We welcome patches to improve the install and usage experience on other platforms, and volunteers to help us maintain portability to many platforms by testing the tools regularly.
The project's source code is broken up into repositories with mostly disjoint functionality.
The rigel repository acts as a container; all other repositories are stored and .gitignored as subdirectories. rigel also contains documentation and utility scripts that cut across repositories, and scripts to install and update the tools contained in the other repositories.
The codegen repository contains everything needed to cross-compile C and assembly code for Rigel on a host machine. Our compilation toolchain is pictured below; we use clang 2.8 as a C89, C99, and assembly front-end, LLVM 2.8 for middle-end optimizations, an LLVM backend to generate assembly code, and GNU binutils 2.18 to assemble and link binaries.
The targetcode repository contains all C and assembly code intended to run on Rigel. This includes libraries and application code.The targetcode/lib subdirectory includes:
The targetcode/src subdirectory includes a small set of data- and task-parallel benchmarks useful in evaluating many-core designs like Rigel, a larger set of test codes useful for evaluating the correctness and performance of library and compiler features, and a Makefile.common with environment variables and compiler toolchain flags. The benchmarks are:
The sim repository contains RigelSim, an execution-driven simulator for the Rigel architecture written in C++. The repository also contains RigelSim-specific dependencies without wide packaging support, such as RandomLib.
RigelSim has a fast functional mode that simulates at around 2 MIPS, and a structural timing mode (the default) that simulates at 100-200 KIPS. To switch between the two, set the RIGEL_CFG_NUM variable in $RIGEL_SIM/rigel-sim/user.config.
All standalone tools in the Rigel repositories are licensed under the permissive University of Illinois Open Source License.
Our modifications to existing tools are under the same license as the tool; for instance, Rigel assembler and linker support in GNU Binutils 2.18 is licensed under GPLv3.
RigelSim can optionally link against GPLv3 tools — like GNU Binutils for instruction disassembly — these dependencies can be enabled with the --enable-gplv3 flag to RigelSim's configure script. Without this flag, the resulting combined work is licensed under the University of Illinois Open Source License. With this flag, the resulting combined work must be licensed under GPLv3.
For more details, see the LICENSE.TXT file in the main Rigel repository.
Here is a video showing the history of our repository from 2007 through early 2012, at normal and 4x speed.