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// Copyright 2016 Philipp Oppermann. See the README.md
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use core::ptr::Unique;
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use core::fmt;
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use spin::Mutex;
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use volatile::Volatile;
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const BUFFER_HEIGHT: usize = 25;
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const BUFFER_WIDTH: usize = 80;
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pub static WRITER: Mutex<Writer> = Mutex::new(Writer {
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column_position: 0,
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color_code: ColorCode::new(Color::White, Color::Black),
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vgabuffer: unsafe { Unique::new_unchecked(0xb8000 as *mut _) },
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});
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// cursor is lightgray for everyone
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static CURSOR: ScreenChar = ScreenChar {
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ascii_character: b' ',
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color_code: ColorCode::new(Color::LightGray, Color::LightGray),
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};
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// blank is black for everyone, could make screens choose this
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static BLANK: ScreenChar = ScreenChar {
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ascii_character: b' ',
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color_code: ColorCode::new(Color::White, Color::Black),
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};
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pub struct Writer {
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column_position: usize,
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pub color_code: ColorCode,
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vgabuffer: Unique<Buffer>,
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}
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macro_rules! println {
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($fmt:expr) => (print!(concat!($fmt, "\n")));
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($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
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}
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macro_rules! print {
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($($arg:tt)*) => ({
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$crate::vga_buffer::print(format_args!($($arg)*));
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});
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}
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pub fn print(args: fmt::Arguments) {
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use core::fmt::Write;
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WRITER.lock().write_fmt(args).unwrap();
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}
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impl Writer {
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pub fn reset_screen(&mut self)
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{
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let color_code = self.color_code;
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for row in 1..BUFFER_HEIGHT {
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for col in 0..BUFFER_WIDTH {
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self.buffer().chars[row][col].write(ScreenChar {
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ascii_character: b' ',
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color_code,
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});
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}
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}
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self.column_position = 0;
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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].write(ScreenChar {
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ascii_character: byte,
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color_code: 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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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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self.buffer().chars[row][col].write(CURSOR);
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}
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fn buffer(&mut self) -> &mut Buffer {
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unsafe { self.vgabuffer.as_mut() }
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}
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fn new_line(&mut self) {
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// remove cursor if newline isnt from end of screen
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if self.column_position < BUFFER_WIDTH {
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let col = self.column_position;
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self.buffer().chars[BUFFER_HEIGHT - 1][col].write(BLANK);
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}
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for row in 1..BUFFER_HEIGHT {
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for col in 0..BUFFER_WIDTH {
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let buffer = self.buffer();
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let character = buffer.chars[row][col].read();
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buffer.chars[row - 1][col].write(character);
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}
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}
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self.clear_row(BUFFER_HEIGHT - 1);
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self.column_position = 0;
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}
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fn clear_row(&mut self, row: usize) {
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for col in 0..BUFFER_WIDTH {
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self.buffer().chars[row][col].write(BLANK);
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}
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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) -> ::core::fmt::Result {
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for byte in s.bytes() {
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self.write_byte(byte)
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}
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Ok(())
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}
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}
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#[allow(dead_code)]
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#[derive(Debug, Clone, Copy)]
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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)]
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pub struct ColorCode(u8);
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impl ColorCode {
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pub const 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)]
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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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struct Buffer {
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chars: [[Volatile<ScreenChar>; BUFFER_WIDTH]; BUFFER_HEIGHT],
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}
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