Getting Started

Install Packages

macOS and Ubuntu users can install the packages with:

./setup.sh

Other platforms are not tested, but should work as long as you have the following packages installed:

• Rust (use rustup)
• QEMU
• GDB (optional)

To use Linux compatibility layer, you also need:

• Zig
• skopeo
• squashfs-tools (mksquashfs)
• Clang, LLD, LLVM binutils
• GNU make and more so-called build-essential packages

TIP

Can I use Windows?

Yes, it should just work on Windows. That said, I recommend using WSL2 for good performance and ease of setup. You can use the same commands as Ubuntu above.

Build and Run OS

make run builds the OS and runs it in QEMU. Just type:

make run

NOTE

To exit QEMU, type Ctrl+A then X. Or C to enter QEMU monitor (debug console).

make run accepts the following environment variables:

Name	Value	Description
BUILD_ONLY	1	Do not start QEMU after building the OS.
QEMU	/path/to/qemu	QEMU binary path. Default is qemu-system-riscv64.
RELEASE	1	Build in release mode. Default is debug mode.

Debugging with GDB

make run starts QEMU with GDB server enabled. You can attach GDB to Starina Kernel by:

make debug

GDB is super useful for debugging especially when you debug the kernel and in-kernel apps. For example, if the kernel hungs, you can check the backtrace with bt command.

What's Next?

TODO: How to write apps such as device drivers.