Vga buffer + test for it
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14
src/main.rs
14
src/main.rs
@ -1,6 +1,8 @@
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#![no_std]
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#![no_main]
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mod vga_buffer;
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use core::panic::PanicInfo;
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#[panic_handler]
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@ -8,19 +10,11 @@ fn panic(_info: &PanicInfo) -> !{
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loop {}
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}
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static GREETING: &[u8] = b"Gamarjoba, munde";
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#[no_mangle]
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pub extern "C" fn _start() -> ! {
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let vga_buffer = 0xb8000 as *mut u8;
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for (i, &byte) in GREETING.iter().enumerate() {
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unsafe {
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*vga_buffer.offset(i as isize * 2) = byte;
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*vga_buffer.offset(i as isize * 2 + 1) = 0xb; //light cyan
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}
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}
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vga_buffer::yolo();
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loop {}
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}
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96
src/vga_buffer.rs
Normal file
96
src/vga_buffer.rs
Normal file
@ -0,0 +1,96 @@
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#[allow(dead_code)]
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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#[repr(u8)]
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pub enum Color {
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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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Magenta = 5,
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Brown = 6,
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LightGray = 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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Pink = 13,
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Yellow = 14,
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White = 15,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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#[repr(transparent)]
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struct ColorCode(u8);
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impl ColorCode {
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fn new(foreground: Color, background: Color) -> ColorCode {
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ColorCode((background as u8) << 4 | (foreground as u8))
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}
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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#[repr(C)]
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struct ScreenChar {
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ascii_char: u8,
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color_code: ColorCode,
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}
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const BUFFER_WIDTH: usize = 80;
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const BUFFER_HEIGHT: usize = 25;
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#[repr(transparent)]
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struct Buffer {
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chars: [[ScreenChar; BUFFER_WIDTH]; BUFFER_HEIGHT],
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}
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pub struct Writer {
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column_position: usize,
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color_code: ColorCode,
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buffer: &'static mut Buffer,
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}
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impl Writer {
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pub fn write_string(&mut self, s: &str) {
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for byte in s.bytes() {
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match byte {
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0x20..=0x7e | b'\n' => self.write_byte(byte),
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_ => self.write_byte(0xfe), // a ■
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}
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}
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}
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pub fn write_byte(&mut self, byte: u8) {
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match byte {
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b'\n' => self.new_line(),
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byte => {
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if self.column_position >= BUFFER_WIDTH {
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self.new_line();
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}
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let row = BUFFER_HEIGHT - 1;
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let col = self.column_position;
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let color_code = self.color_code;
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self.buffer.chars[row][col] = ScreenChar {
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ascii_char: byte, color_code,
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};
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self.column_position += 1;
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}
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}
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}
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fn new_line(&mut self) {
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}
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}
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pub fn yolo() {
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let mut writer = Writer {
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column_position: 0, color_code: ColorCode::new(Color::Yellow, Color::Black),
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buffer: unsafe { &mut *(0xb8000 as *mut Buffer) },
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};
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writer.write_string("Gamarjoba, munde\n");
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writer.write_string("Hella bro");
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writer.write_string("sore は");
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}
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