A Go unikernel running on x86 bare metal
Run Go applications on x86 bare metal, written entirely in Go (only a small amount of C and some assembly), support most features of Go (like GC, goroutine) and standard libraries, also come with a network stack that can run most
net based libraries.
Go's runtime provides some basic operating system abstractions. Goroutine corresponds to processes and channel corresponds to inter-process communication. In addition, go has its own virtual memory management, so the idea of running Go programs on bare metal was born.
It turns out that Go has the ability to manipulate hardware resources, thanks to Go's controllable memory layout, the ability to directly translate hardware instructions without a virtual machine, and C-like syntax. These all make it possible for Go to write programs that run on bare metal. However, there are also some challenges. Go piling in many instructions to perform coroutine scheduling and memory GC, which brings some troubles in some places that cannot be reentrant, such as interrupt handling and system calls.
In general, writing kernel in Go is a very interesting experience. On the one hand, it gave me a deep understanding of Go's runtime. On the other hand, it also provided an attempt to write the operating system kernel on bare metal in addition to the C language.
- Basic Go features, such as GC, goroutine, channel.
- A simple console supports basic line editting.
- Network stack supports tcp/udp.
- Go style vfs abstraction using afero
- A nes game emulator using nes
- VBE based frame buffer.
- Some simple network apps (httpd, sshd).
- GUI support by nucular.
- Go 1.16.x (higher versions may not work)
$ go get github.com/magefile/mage $ brew install x86_64-elf-binutils x86_64-elf-gcc x86_64-elf-gdb $ brew install qemu
$ go get github.com/magefile/mage $ sudo apt-get install build-essential qemu
$ mage qemu
Build your own unikernel
eggos has the ability to convert normal go program into an
ELF unikernel which an be running on bare metal.
First, get the
egg binary, which can be accessed through https://github.com/icexin/eggos/releases, or directly through
go install github.com/icexin/eggos/cmd/egg
egg build -o kernel.elf in your project directory to get the kernel file, and then run
egg run kernel.elf to start the qemu virtual machine to run the kernel.
egg pack -o eggos.iso -k kernel.elf can pack the kernel into an iso file, and then you can use https://github.com/ventoy/Ventoy to run the iso file on a bare metal.
Here are some examples examples
You can directly use the gdb command to debug, or use vscode for graphical debugging.
First you need to install gdb, if you are under macos, execute the following command
brew install x86_64-elf-gdb
Use the extension
Native Debug in vscode to support debugging with gdb
First execute the
mage qemudebug command to let qemu start the gdb server, and then use the debug function of vscode to start a debug session. The debug configuration file of vscode is built into the project.
Go provides simple support for gdb, see Debugging Go Code with GDB for details
Running on bare metal
If you want eggos to run on bare metal, it is recommended to use grub as the bootloader.
The multiboot.elf generated after executing the make command is a kernel image conforming to the multiboot specification, which can be directly recognized by grub and booted on a bare metal. The sample configuration file refer to
- WASM runner
- GUI support
- 3D graphic
- x86_64 support
- SMP support
- Cloud server support (virtio)
- Raspberry Pi support (arm64 aka aarch64)
The program still has a lot of bugs, often loses response or panic. If you are willing to contribute, please submit a PR, thank you!
The birth of my little daughter brought a lot of joy to the family. This project was named after her name
Xiao Dandan. My wife and mother also gave me a lot of support and let me work on this project in my spare time.