elf2efi VS 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The "official" (with outdated code) bootloader: https://github.com/rust-osdev/bootloader/blob/main/src/bin/uefi.rs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.