#![no_std]
#![feature(abi_x86_interrupt)]
#![warn(
    clippy::correctness,
    clippy::nursery,
    clippy::unnecessary_cast,
    clippy::all,
    clippy::suspicious,
    clippy::perf,
    rustdoc::missing_errors_doc,
    rustdoc::missing_panics_doc
)]

use core::arch::asm;
use graphics::font::{FONT_SPLEEN_8X16, Font};
use limine::BaseRevision;

mod arch;
mod graphics;
mod io;

/// Sets the base revision to the latest revision supported by the crate.
/// See specification for further info.
/// Be sure to mark all limine requests with #[used], otherwise they may be
/// removed by the compiler.
#[used]
// The .requests section allows limine to find the requests faster and more safely.
#[unsafe(link_section = ".requests")]
static BASE_REVISION: BaseRevision = BaseRevision::new();

/// The default font used when setting up the framebuffer code.
pub const DEFAULT_FONT: Font = FONT_SPLEEN_8X16;

#[panic_handler]
fn rust_panic(_info: &core::panic::PanicInfo) -> ! {
    hcf();
}

pub fn hcf() -> ! {
    loop {
        unsafe {
            asm!("hlt");
        }
    }
}

pub fn boot() -> Result<(), &'static str> {
    if !BASE_REVISION.is_supported() {
        return Err("base revision not supported");
    }

    Ok(())
}