RISC-V based Virtual Prototype (VP)

Key features of our VP:

• This draft supports the bit manipulation extension
• RV32IMAC core + machine mode CSRs
• Implemented in SystemC TLM-2.0
• SW debug capabilities (GDB RSP interface) with Eclipse
• FreeRTOS support
• Generic and configurable bus
• CLINT and PLIC-based interrupt controller + additional peripherals
• Instruction-based timing model + annotated TLM 2.0 transaction delays
• New: Peripherals, e.g. display, flash controller, preliminary ethernet
• New: Example configuration for the SiFive HiFive1 board available
• New: Zephyr operating system support
• New: Support for simulation of multi-core platforms
• New: Supervisor- and user-mode (including user traps) privilege levels
• New: Floating-point extension (F) for the RV32 core
• New: RV64GC core (i.e. RV64IMAFDC)

For related information, e.g. verification, please visit http://www.systemc-verification.org/ or contact [email protected]. We accept pull requests and in general contributions are very welcome.

In the following we provide build instructions and how to compile and run software on the VP.

1) Build the RISC-V GNU Toolchain:

(Cross-)Compiling the software examples, in order to run them on the VP, requires the RISC-V GNU toolchain to be available in PATH. Several standard packages are required to build the toolchain. On Ubuntu the required packages can be installed as follows:

sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev

On Fedora, following actions are required:

sudo dnf install autoconf automake curl libmpc-devel mpfr-devel gmp-devel gawk bison flex texinfo gperf libtool patchutils bc zlib-devel expat-devel cmake boost-devel
sudo dnf groupinstall "C Development Tools and Libraries"
#optional debuginfo
sudo dnf debuginfo-install boost-iostreams boost-program-options boost-regex bzip2-libs glibc libgcc libicu libstdc++ zlib

For more information on prerequisites for the RISC-V GNU toolchain visit https://github.com/riscv/riscv-gnu-toolchain. With the packages installed, the toolchain can be build as follows:

git clone https://github.com/riscv/riscv-gnu-toolchain.git
cd riscv-gnu-toolchain
git submodule update --init --recursive

./configure --prefix=$(pwd)/../riscv-gnu-toolchain-dist-rv32g-ilp32d --with-arch=rv32g --with-abi=ilp32d

make

2) Build this RISC-V Virtual Prototype:

i) in vp/dependencies folder (will download and compile SystemC, and build a local version of the softfloat library):

./build_systemc_233.sh
./build_softfloat.sh

ii) in vp folder (requires the boost C++ library):

mkdir build
cd build
cmake ..
make install

The install argument is optional, it will copy all VP executables to the local vp/build/bin folder.

3) Compile and run some Software:

In sw:

cd simple-sensor    # can be replaced with different example
make                # (requires RISC-V GNU toolchain in PATH)
make sim            # (requires *riscv-vp*, i.e. *vp/build/bin/riscv-vp*, executable in PATH)

Please note, if make is called without the install argument in step 2, then the riscv-vp executable is available in vp/build/src/platform/basic/riscv-vp.

4) Optional Makefile:

The toplevel Makefile can alternatively be used to build the VP including its dependencies (i.e. step 2 in this README), from the toplevel folder call:

make

This will also copy the VP binaries into the vp/build/bin folder.