Jeremy Soller
67 lines
1.2 KiB
Rust
67 lines
1.2 KiB
Rust
#![no_std]
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#![feature(lang_items)]
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#![feature(llvm_asm)]
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use core::slice;
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mod panic;
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#[repr(packed)]
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pub struct VgaTextBlock {
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char: u8,
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color: u8,
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}
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#[repr(u8)]
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pub enum VgaTextColor {
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Black = 0,
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Blue = 1,
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Green = 2,
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Cyan = 3,
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Red = 4,
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Purple = 5,
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Brown = 6,
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Gray = 7,
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DarkGray = 8,
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LightBlue = 9,
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LightGreen = 10,
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LightCyan = 11,
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LightRed = 12,
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LightPurple = 13,
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Yellow = 14,
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White = 15,
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}
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#[no_mangle]
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pub unsafe extern "C" fn kstart() -> ! {
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let vga = slice::from_raw_parts_mut(
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0xb8000 as *mut VgaTextBlock,
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80 * 25
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);
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for i in 0..vga.len() {
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vga[i].char = 0;
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vga[i].color =
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((VgaTextColor::DarkGray as u8) << 4) |
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(VgaTextColor::White as u8);
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}
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let draw_text = |vga: &mut [VgaTextBlock], x: usize, y: usize, text: &str| {
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let mut i = y * 80 + x;
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for c in text.chars() {
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if let Some(block) = vga.get_mut(i) {
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block.char = c as u8;
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}
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i += 1;
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}
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};
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draw_text(
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vga,
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10, 1,
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"Arrow keys and space select mode, enter to continue"
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);
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loop {}
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}
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