Building a kernel for Qemu's riscv virtual machine from scratch in Rust.

• uses OpenSBI, a sort of BIOS that Qemu defaults to, to simplify some peripheral interactions
• I am trying to use as few dependencies and as little assembly as possible

• Rust
• riscv64 target: rustup target add riscv64gc-unknown-none-elf
• riscv64-unknown-elf toolchain (providing gdb and binutils)
• qemu-system-riscv64 (e.g sudo dnf install qemu-system-riscv on Fedora)

To compile the latter from source see riscv-gnu-toolchain

OpenSBI selects a hart as boot core and jumps to kernel. Kernel has to start up other harts by itself.

• https://github.com/mit-pdos/xv6-riscv
• https://osblog.stephenmarz.com/
• many more, TODO: add