feat(OS): Create basic kernel that can be run through both QEMU and on hardware #1

Merged
noah.knegt merged 3 commits from setup-os-structure into main 2025-07-20 21:15:06 +02:00
10 changed files with 791 additions and 1 deletions

4
.cargo/config.toml Normal file
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@@ -0,0 +1,4 @@
[unstable]
# enable the unstable artifact-dependencies feature, see
# https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#artifact-dependencies
bindeps = true

5
.gitignore vendored
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@@ -16,3 +16,8 @@ target/
# and can be added to the global gitignore or merged into this file. For a more nuclear
# option (not recommended) you can uncomment the following to ignore the entire idea folder.
#.idea/
# Added by cargo
/target

644
Cargo.lock generated Normal file
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name = "windows_x86_64_msvc"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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"bitflags 2.9.1",
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name = "wyz"
version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
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34
Cargo.toml Normal file
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@@ -0,0 +1,34 @@
[workspace]
resolver = "3"
members = [
"kernel"
]
[workspace.package]
version = "0.1.0"
edition = "2024"
license-file = "LICENSE"
authors = [
"Noah Knegt <personal@noahknegt.com>"
]
readme = "README.md"
publish = false
[workspace.dependencies]
[package]
name = "FerrOS"
version.workspace = true
authors.workspace = true
edition.workspace = true
license-file.workspace = true
readme.workspace = true
publish.workspace = true
[build-dependencies]
bootloader = { version = "0.11.10" }
kernel = { path = "kernel", artifact = "bin", target = "x86_64-unknown-none" }
[dependencies]
ovmf-prebuilt = "0.1.0-alpha.1"

View File

@@ -1,3 +1,26 @@
# FerrOS
A custom OS written in Rust
A custom OS written in Rust
## Running the OS
You can start running the OS by executing:
```bash
cargo run
```
This assumes that you have a rust environment setup and cargo is available, the easiest way to do this is with [rustup](https://rustup.rs/).
### Dependencies
You should have the command `qemu-system-x86_64` available on your system to run the OS through an emulator, although it is also possible to flash it on an USB-drive and boot it directly.
For debian users you can install the [`qemu-system-x86`](https://packages.debian.org/sid/qemu-system-x86) package and that will make sure all dependencies for the emulator are correctly installed.
### Install to USB-drive
To install it to an USB-drive you can use the following command if you are on a linux system.
```bash
sudo dd if=<path-to-project>/target/<config>/FerrOS of=/dev/sdX bs=1M status=progress
```

21
build.rs Normal file
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@@ -0,0 +1,21 @@
use std::path::PathBuf;
fn main() {
// set by cargo, build scripts should use this directory for output files
let out_dir = PathBuf::from(std::env::var_os("OUT_DIR").unwrap());
// set by cargo's artifact dependency feature, see
// https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#artifact-dependencies
let kernel = PathBuf::from(std::env::var_os("CARGO_BIN_FILE_KERNEL_kernel").unwrap());
// create an UEFI disk image (optional)
let uefi_path = out_dir.join("uefi.img");
bootloader::UefiBoot::new(&kernel).create_disk_image(&uefi_path).unwrap();
// create a BIOS disk image
let bios_path = out_dir.join("bios.img");
bootloader::BiosBoot::new(&kernel).create_disk_image(&bios_path).unwrap();
// pass the disk image paths as env variables to the `main.rs`
println!("cargo:rustc-env=UEFI_PATH={}", uefi_path.display());
println!("cargo:rustc-env=BIOS_PATH={}", bios_path.display());
}

12
kernel/Cargo.toml Normal file
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@@ -0,0 +1,12 @@
[package]
name = "kernel"
version = "0.1.0"
edition.workspace = true
license-file.workspace = true
authors.workspace = true
readme.workspace = true
publish.workspace = true
[dependencies]
bootloader_api = { version = "0.11.10" }

16
kernel/src/main.rs Normal file
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@@ -0,0 +1,16 @@
#![no_std]
#![no_main]
use bootloader_api::{entry_point, BootInfo};
entry_point!(kernel_main);
fn kernel_main(boot_info: &'static mut BootInfo) -> ! {
loop {}
}
#[panic_handler]
#[cfg(not(test))]
fn panic(info: &core::panic::PanicInfo) -> ! {
loop {}
}

11
rust-toolchain.toml Normal file
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@@ -0,0 +1,11 @@
[toolchain]
channel = "nightly"
targets = [
"x86_64-unknown-none"
]
components = [
"clippy",
"rustfmt",
"rust-src",
"llvm-tools-preview"
]

20
src/main.rs Normal file
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@@ -0,0 +1,20 @@
// Helper amin that will allow the kernel of FerrOS to be run through QEMU with just the "cargo run" command
fn main() {
// read env variables that were set in build script
let uefi_path = env!("UEFI_PATH");
let bios_path = env!("BIOS_PATH");
// choose whether to start the UEFI or BIOS image
let uefi = true;
let mut cmd = std::process::Command::new("qemu-system-x86_64");
if uefi {
cmd.arg("-bios").arg(ovmf_prebuilt::ovmf_pure_efi());
cmd.arg("-drive").arg(format!("format=raw,file={uefi_path}"));
} else {
cmd.arg("-drive").arg(format!("format=raw,file={bios_path}"));
}
let mut child = cmd.spawn().unwrap();
child.wait().unwrap();
}