uefi-rs VS bootloader

Hi, did you know that you can write UEFI-code with Rust? You can, using uefi-rs!

Thanks for pointing that out. I've filed https://github.com/rust-osdev/uefi-rs/issues/685

I'm extremely confused as to what's going on here. I think it might be related to Line 129: https://github.com/rust-osdev/uefi-rs/blob/main/src/table/system.rs

First off I don't recommend implementing the specification from scratch. It is big, and there are implementations already in various languages: for C you can use GNU-UEFI, for example, and for Rust you can use uefi-rs. Zig even has it in its standard library! These take care of the fiddly details of interacting with the UEFI firmware's services.

There's tutorial type articles for these around: for C there's https://wiki.osdev.org/UEFI_App_Bare_Bones, for Rust there's this template https://github.com/rust-osdev/uefi-rs/tree/main/template and the crate's documentation.

A few people have made some progress into working with UEFI in Rust, and the results are here: https://github.com/rust-osdev/uefi-rs

use uefi::prelude::Handle; points to uefi-rs/src/prelude.rs found here: https://github.com/rust-osdev/uefi-rs/blob/master/src/prelude.rs

Here is an UEFI app/example that should show you how to write a UEFI bootloader.

That's just an unbased claims. People have written bootloader in rust and the linux kernel is also considering adopting Rust. None of this would happen if Rust cannot interface the hardware or is turing complete.

The "official" (with outdated code) bootloader: https://github.com/rust-osdev/bootloader/blob/main/src/bin/uefi.rs

A quick wander through the docs, and then the repo turned up an open feature request for VESA video modes which mentions a merged PR for 320x200 VGA support.

But here I come across an interesting structure https://github.com/rust-osdev/bootloader/tree/main/examples/test_framework

Long story short, it appears there is no way to get started with UEFI (cue more downvotes). I've even spent a week carefully copying code beginning here: https://github.com/rust-osdev/bootloader/blob/main/src/bin/uefi.rs only to discover that nothing displays to the screen. There is an error somewhere in the 500 lines required to print a character to the screen, and it's impossible to tell where it is.

rust-osdev/bootloader

You can also take a look at the upcoming version of the bootloader crate, which has UEFI support: https://github.com/rust-osdev/bootloader/pull/130 . It is not documented very well yet, but maybe it helps already. The UEFI entry point function is here .The #[entry] macro of the uefi crate just makes the function a pub extern "efiapi" fn. The function is named efi_main because that's the default entry point name for Rust's built-in UEFI targets (e.g. x86_64-unknown-uefi). Theimageandst` function arguments are passed directly by the UEFI firmware.