RISC-V 32bit CPU written in Chisel

RISC-V 32bit CPU written in Chisel. This project is for my learning purpose to understand how to design/implement hardware with Chisel and what RISC-V architecture is. Working in progress.

References

• RISC-VとChiselで学ぶ はじめてのCPU自作: https://gihyo.jp/book/2021/978-4-297-12305-5
  • 'Introduction to making your own CPU with RISC-V and Chisel' Japanese book
• Chisel API Document: https://www.chisel-lang.org/api/latest/chisel3/index.html
• RISC-V Spec: https://riscv.org/technical/specifications/
  • https://github.com/riscv/riscv-isa-manual/releases/download/Ratified-IMAFDQC/riscv-spec-20191213.pdf
• Assembly Manual: https://github.com/riscv/riscv-asm-manual/blob/master/riscv-asm.md
• Reference simulator: https://github.com/riscv/riscv-isa-sim
  • Proxy kernel: https://github.com/riscv/riscv-pk
• "V" vector extension: https://github.com/riscv/riscv-v-spec
  • https://github.com/riscv/riscv-v-spec/releases/download/v1.0-rc1/riscv-v-spec-1.0-rc1.pdf
• GNU toolchain: https://github.com/riscv/riscv-gnu-toolchain
  • TODO: This repository currently refers to rvv-0.9.x branch but it should refer to rvv-intrinsic branch for RVV v1.0-rc.

This repository was imported from chisel-template@f5f33c6.

Install

Clone this repository:

git clone --recursive https://github.com/rhysd/riscv32-cpu-chisel.git

Build Docker image for RISC-V GNU toolchain and Scala toolchain:

docker build . -t riscv/mycpu

Start an interactive shell with mounting this repository:

docker run -it -v $(pwd):/app riscv/mycpu

Generate Verilog sources

Verilog sources can be generated from Chisel sources via sbt run:

make ./c/fib.hex # Make hex dump of memory image of program to run
make verilog MEMORY_HEX_FILE_PATH=./c/fib.hex # Generate Verilog sources
cat ./verilog/Top.v

Test

riscv-tests

To run all tests in riscv-tests:

make riscv-tests

Outputs of tests are stored in riscv-tests-results directory.

To run a specific test case in riscv-tests (when running rv32ui-p-addi test case):

make ./riscv-tests-results/rv32ui-p-addi.out

C tests

To run all tests with C sources in c/ directory:

make c-tests

Outputs of tests are stored in c-tests-results directory.

To run a specific test case in c-tests (when running fib.c test case):

make ./c-tests-results/fib.out

Rust tests

To run all tests with Rust sources in rust/ directory:

make rust-tests

Outputs of tests are stored in rust-tests-results directory.

To run a specific test case in rust-tests (when running fib test case):

make ./rust-tests-results/fib.out

Run tests with the uploaded Docker image

Run docker run with the uploaded Docker image.

docker run --rm -v $(pwd):/app --workdir /app -t rhysd/riscv-cpu-chisel:latest make riscv-tests

License

Distributed under the MIT license.