RVVM - The RISC-V Virtual Machine

RISC-V CPU & System software implementation written in С

What's done so far

• Feature-complete RV32I instruction set
• C, M instruction extensions
• Extendable and fast instruction decoder
• Physical memory
• Memory mapping unit (MMU) with SV32 virtual addressing
• TLB address caching (greatly speeds up memory operations)
• MMIO handlers
• Bootrom loading

Usage

Currently builds on *nix systems using GNU Make. Actual code however is cross-platform and more build targets are going to be supported, including Windows, or even embedded systems. The bootrom.bin file is a user-provided raw binary, loaded at 0x80000000 address where it starts execution.

git clone https://github.com/Mr0maks/rvvm
make
cd release.linux.x86_64
./rvvm_x86_64 bootrom.bin

Our team

• LekKit: Instruction decoding, RAM/MMU/TLB implementation, parts of RV32I/C ISA
• Mr0maks: Initial ideas, C/M extensions, VM debugger, bootrom testing
• Hoping to see more contributors here

TODO

• Debug the available functionality to make sure it's conforming to the specs
• Control and Status Registers (CSR)
• Privileged modes, operations
• Basic peripherals atleast
• Supervisor Binary Interface
• Successfully booting Linux kernel and userspace software
• A lot more...
• JIT? RV64?