bussy/stage1/src/main.rs

#![no_std]
#![no_main]

use core::panic::PanicInfo;

/// Collection of all assembly sources and symbols they expose
mod asm;
/// BIOS disk access utilities
mod disk;

use crate::disk::{get_sector_size, read_lba};
use asm::{do_bios_int, get_boot_drive, get_boot_lba, BiosIntRegs};

use asm::{do_bios_int, BiosIntRegs};

#[no_mangle]
pub extern "C" fn main() -> ! {
    print("hi im gay uwu");

    loop {}
}

#[panic_handler]
pub fn rust_panic(_info: &PanicInfo) -> ! {
    print("stage1 panicked, system halted.\r\n");
    loop {
        unsafe {
            core::arch::asm!("cli", "hlt");
        }
    }
}

pub fn print(s: &str) {
    for b in s.bytes() {
        if b == b'\0' {
            break;
        }

        let regs = BiosIntRegs {
            eax: 0x0e00 | b as u32,
            ebx: 0x0001,
            ..Default::default()
        };
        unsafe {
            let _ = do_bios_int(0x10, regs);
        }
    }
}