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Hi,
First of all, I want to say big thanks because your blog that explains quite well how to start with kernel OS using Rust! This language is always compared to C language but it's very rare to find an interesting blog about how to write kernel OS in Rust.
When I'm trying to play with A Minimal Rust Kernel example, I actually got an error from cargo bootimage. I don't really know where the error comes from but I've setup a workspace project compares to your example such that my directory looks like:
- dummy_os/
- Cargo.toml
- .cargo/
- config
- src/
- dummy_os/
- Cargo.toml
- main.rs
- dummy_os/
- x86_64-dummy_os.json
The top Cargo.toml:
[workspace]
members = [
"src/dummy_os",
]
# the profile used for `cargo build`
[profile.dev]
panic = "abort" # disable stack unwinding on panic
# the profile used for `cargo build --release`
[profile.release]
panic = "abort" # disable stack unwinding on panicThe .cargo/config:
[build]
target = "x86_64-dummy_os.json"
[target.'cfg(target_os = "none")']
runner = "bootimage runner"The src/dummy_os/Cargo.toml:
[package]
name = "dummy_os"
version = "0.1.0"
edition = "2018"
[[bin]]
name = "dummy_os"
path = "main.rs"
[dependencies]
bootloader = "*"The src/dummy_os/main.rs:
#![no_std] // don't link the Rust standard library
#![no_main] // disable all Rust-level entry points
use core::panic::PanicInfo;
/// This function is called on panic.
#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
loop {}
}
static HELLO: &[u8] = b"Hello World!";
#[no_mangle] // don't mangle the name of this function
pub extern "C" fn _start() -> ! {
let vga_buffer = 0xb8000 as *mut u8;
for (i, &byte) in HELLO.iter().enumerate() {
unsafe {
*vga_buffer.offset(i as isize * 2) = byte;
*vga_buffer.offset(i as isize * 2 + 1) = 0xb;
}
}
loop {}
}Here's the error:
Building kernel
WARNING: There is no root package to read the cargo-xbuild config from.
Updating crates.io index
Compiling core v0.0.0 (~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore)
Compiling compiler_builtins v0.1.27
Compiling rustc-std-workspace-core v1.99.0 (~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/tools/rustc-std-workspace-core)
Compiling alloc v0.0.0 (/tmp/cargo-xbuild.B83qpoInHGhF)
Finished release [optimized] target(s) in 39.40s
Compiling bootloader v0.9.2
Compiling dummy_os v0.1.0 (~/dummy_os/src/dummy_os)
Finished dev [unoptimized + debuginfo] target(s) in 0.94s
Error: Could not find required key `packages[manifest_path = `~/dummy_os/Cargo.toml`]` in cargo metadata output
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