Rustpi: a research kernel

Build the kernel:

make # both aarch64 and riscv64
make aarch64 # for raspberry pi 3b
make riscv64 # for riscv64 qemu machine virt

Run emulation:

make aarch64-emu # raspberry pi 3b
make riscv64-emu # riscv64 qemu machine virt

User mode programs

• User mode programs are written in Rust.
• See build.rs for how to embed them into kernel image.
• Repo: https://github.com/tonnylyz/rustpi-user

What is working (both aarch64 and riscv64)

• Bootstrap
• UART
• Kernel virtual memory (code compiled from Rust run at high address space)
• Kernel interrupt and exception handling
• Kernel non-paged pool (buddy system from rCore: https://github.com/rcore-os/buddy_system_allocator)
• User space memory management (paged)
• User programs running at user mode
• System calls
• Memory management system calls
• Process management system calls
• A user fork demo
• Copy on Write page fault management

Todo

• A robust scheduler
• Inter-process communication(IPC) for new thread/process model
• Ram disk
• File system
• Code comments
• Code refactoring
• and so on...

Toolchains required

• Make
• Rust (latest nightly)
• Aarch64 GCC Toolchain (default prefix: aarch64-elf-)
• Riscv64 GCC Toolchain (default prefix: riscv64-unknown-elf-)
• QEMU system emulation (qemu-system-aarch64 and qemu-system-riscv64)

Note for Windows: GnuWin32 coreutils & make: http://gnuwin32.sourceforge.net/packages.html

Toolchains suggested

• Aarch64: Linaro GCC Toolchain: https://www.linaro.org/downloads/
• Riscv64: SiFive GCC Toolchain: https://www.sifive.com/boards/
• QEMU: https://www.qemu.org/download/
• Rust: https://rustup.rs/

Note for Windows: toolchains above are also available for Windows.