133 lines
2.9 KiB
Rust
133 lines
2.9 KiB
Rust
use core::fmt::{self, Write};
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use lazy_static::lazy_static;
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use spin::Mutex;
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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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pub struct ColorCode(u8);
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impl ColorCode {
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pub 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_character: u8,
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color_code: ColorCode,
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}
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const BUFFER_HEIGHT: usize = 25;
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const BUFFER_WIDTH: usize = 80;
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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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col: usize,
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row: usize,
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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_byte(&mut self, byte: u8) {
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self.write_byte_color(byte, ColorCode::new(Color::White, Color::Black));
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}
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pub fn write_byte_color(&mut self, byte: u8, color: ColorCode) {
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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.col >= BUFFER_WIDTH {
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self.new_line();
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}
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let row = self.row;
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let col = self.col;
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let color_code = color;
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self.buffer.chars[row][col] = ScreenChar {
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ascii_character: byte,
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color_code,
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};
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self.col += 1;
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}
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}
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}
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pub fn write_string(&mut self, s: &str) {
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self.write_string_color(s, ColorCode::new(Color::White, Color::Black));
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}
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pub fn write_string_color(&mut self, s: &str, color: ColorCode) {
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for char in s.bytes() {
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match char {
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0x20..=0x7e | b'\n' => self.write_byte_color(char, color),
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_ => self.write_byte(0xfe),
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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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self.row += 1;
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self.col = 0;
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}
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}
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impl fmt::Write for Writer {
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fn write_str(&mut self, s: &str) -> fmt::Result {
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self.write_string(s);
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Ok(())
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}
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}
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lazy_static! {
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pub static ref WRITER: Mutex<Writer> = Mutex::new(Writer {
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col: 0,
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row: 0,
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buffer: unsafe { &mut *(0xB8000 as *mut Buffer) },
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});
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}
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#[doc(hidden)]
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pub fn _print(args: fmt::Arguments) {
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WRITER.lock().write_fmt(args).unwrap()
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}
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#[macro_export]
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macro_rules! print {
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($($arg:tt)*) => ($crate::vga_buffer::_print(format_args!($($arg)*)));
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}
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#[macro_export]
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macro_rules! println {
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() => ($crate::print!("\n"));
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($($arg:tt)*) => ($crate::print!("{}\n", format_args!($($arg)*)));
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}
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