99 lines
2.0 KiB
Rust
99 lines
2.0 KiB
Rust
use volatile::Volatile;
|
|
|
|
#[allow(dead_code)]
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
#[repr(u8)]
|
|
pub enum Color {
|
|
Black = 0,
|
|
Blue = 1,
|
|
Green = 2,
|
|
Cyan = 3,
|
|
Red = 4,
|
|
Magenta = 5,
|
|
Brown = 6,
|
|
LightGray = 7,
|
|
DarkGray = 8,
|
|
LightBlue = 9,
|
|
LightGreen = 10,
|
|
LightCyan = 11,
|
|
LightRed = 12,
|
|
Pink = 13,
|
|
Yellow = 14,
|
|
White = 15,
|
|
}
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
#[repr(transparent)]
|
|
struct ColorCode(u8);
|
|
|
|
impl ColorCode {
|
|
fn new(foreground: Color, background: Color) -> ColorCode {
|
|
ColorCode((background as u8) << 4 | (foreground as u8))
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
#[repr(C)]
|
|
struct ScreenChar {
|
|
ascii_char: u8,
|
|
color_code: ColorCode,
|
|
}
|
|
|
|
const BUFFER_WIDTH: usize = 80;
|
|
const BUFFER_HEIGHT: usize = 25;
|
|
|
|
#[repr(transparent)]
|
|
struct Buffer {
|
|
chars: [[Volatile<ScreenChar>; BUFFER_WIDTH]; BUFFER_HEIGHT],
|
|
}
|
|
|
|
pub struct Writer {
|
|
column_position: usize,
|
|
color_code: ColorCode,
|
|
buffer: &'static mut Buffer,
|
|
}
|
|
|
|
impl Writer {
|
|
pub fn write_string(&mut self, s: &str) {
|
|
for byte in s.bytes() {
|
|
match byte {
|
|
0x20..=0x7e | b'\n' => self.write_byte(byte),
|
|
_ => self.write_byte(0xfe), // a ■
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn write_byte(&mut self, byte: u8) {
|
|
match byte {
|
|
b'\n' => self.new_line(),
|
|
byte => {
|
|
if self.column_position >= BUFFER_WIDTH {
|
|
self.new_line();
|
|
}
|
|
let row = BUFFER_HEIGHT - 1;
|
|
let col = self.column_position;
|
|
let color_code = self.color_code;
|
|
self.buffer.chars[row][col].write(ScreenChar {
|
|
ascii_char: byte, color_code,
|
|
});
|
|
self.column_position += 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn new_line(&mut self) {
|
|
|
|
}
|
|
}
|
|
|
|
pub fn yolo() {
|
|
let mut writer = Writer {
|
|
column_position: 0, color_code: ColorCode::new(Color::Yellow, Color::Black),
|
|
buffer: unsafe { &mut *(0xb8000 as *mut Buffer) },
|
|
};
|
|
|
|
writer.write_string("Gamarjoba, munde\n");
|
|
writer.write_string("Hella bro");
|
|
writer.write_string("sore は");
|
|
}
|