Add back code for writing to screen

Cargo.lock

@@ -8,9 +8,50 @@ version = "0.9.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a62c8f6168cd106687ee36a2b71a46c4144d73399f72814104d33094b8092fd2"
 
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+dependencies = [
+ "spin 0.5.2",
+]
+
+[[package]]
+name = "lock_api"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88943dd7ef4a2e5a4bfa2753aaab3013e34ce2533d1996fb18ef591e315e2b3b"
+dependencies = [
+ "scopeguard",
+]
+
 [[package]]
 name = "rustos"
 version = "0.1.0"
 dependencies = [
  "bootloader",
+ "lazy_static",
+ "spin 0.9.2",
+]
+
+[[package]]
+name = "scopeguard"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+
+[[package]]
+name = "spin"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
+
+[[package]]
+name = "spin"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "511254be0c5bcf062b019a6c89c01a664aa359ded62f78aa72c6fc137c0590e5"
+dependencies = [
+ "lock_api",
 ]

Cargo.toml

@@ -7,4 +7,9 @@ edition = "2021"
 [dependencies]
 #bootloader = "0.10.12"
 bootloader = "0.9.8"
+spin = "0.9.2"
+
+[dependencies.lazy_static]
+version = "1.4.0"
+features = ["spin_no_std"]
 

src/main.rs

@@ -2,10 +2,8 @@
 #![no_std]
 #![no_main]
 
-/*
 #[macro_use]
 mod vga_buffer;
-*/
 
 use core::panic::PanicInfo;
 
@@ -14,23 +12,9 @@ fn panic(_info: &PanicInfo) -> ! {
     loop {}
 }
 
-static GAMARJOBA: &[u8] = b"Gamarjoba, MVNDE!";
-
 #[no_mangle]
 pub extern "C" fn _start() -> ! {
-    let vga_buffer = 0xb8000 as *mut u8;
-
-    for (i, &byte) in GAMARJOBA.iter().enumerate() {
-        let i = i as isize;
-        unsafe {
-            *vga_buffer.offset(i * 2) = byte;
-            *vga_buffer.offset(i * 2 + 1) = 0xd;
-
-
-        }
-
-    }
-
+    println!("Gamarjoba, munde!");
     loop {}
 }
 

src/vga_buffer.rs

@@ -1,4 +1,3 @@
-use volatile::Volatile;
 use core::fmt;
 use spin::Mutex;
 use lazy_static::lazy_static;
@@ -18,10 +17,13 @@ macro_rules! println {
 #[doc(hidden)]
 pub fn _print(args: fmt::Arguments) {
     use core::fmt::Write;
+    WRITER.lock().write_fmt(args).unwrap();
+    /*
     use x86_64::instructions::interrupts;
     interrupts::without_interrupts(|| {
       WRITER.lock().write_fmt(args).unwrap();
     });
+    */
 }
 
 #[allow(dead_code)]
@@ -46,12 +48,13 @@ pub enum Color {
     White = 15,
 }
 
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 #[repr(transparent)]
-struct ColorCode(u8);
+pub struct ColorCode(u8);
 
 impl ColorCode {
-  fn new(foreground: Color, background: Color) -> ColorCode {
+  pub fn new(foreground: Color, background: Color) -> ColorCode {
     ColorCode((background as u8) << 4 | (foreground as u8))
   }
 }
@@ -67,8 +70,8 @@ const BUFFER_WIDTH: usize = 80;
 const BUFFER_HEIGHT: usize = 25;
 
 #[repr(transparent)]
-struct Buffer {
-  chars: [[Volatile<ScreenChar>; BUFFER_WIDTH]; BUFFER_HEIGHT],
+pub struct Buffer {
+  chars: [[ScreenChar; BUFFER_WIDTH]; BUFFER_HEIGHT],
 }
 
 pub struct Writer {
@@ -78,11 +81,19 @@ pub struct Writer {
 }
 
 impl Writer {
+  pub fn new(color_code: ColorCode) -> Self {
+      Writer {
+          column_position: 0,
+          color_code,
+          buffer: unsafe { &mut *(0xb8000 as *mut Buffer) },
+      }
+
+  }
   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 ■
+        _ => self.write_byte(0xfe), // 0xfe is the character ■
       }
     }
   }
@@ -97,9 +108,16 @@ impl Writer {
         let row = BUFFER_HEIGHT - 1;
         let col = self.column_position;
         let color_code = self.color_code;
-        self.buffer.chars[row][col].write(ScreenChar {
+
+        let ptr = &mut self.buffer.chars[row][col] as *mut ScreenChar;
+        let screenchar = ScreenChar {
             ascii_char: byte, color_code,
-        });
+        };
+
+        unsafe {
+            core::ptr::write_volatile(ptr, screenchar);
+        }
+
         self.column_position += 1;
       }
     }
@@ -108,8 +126,14 @@ impl Writer {
   fn new_line(&mut self) {
     for row in 1..BUFFER_HEIGHT {
       for col in 0..BUFFER_WIDTH {
-        let character = self.buffer.chars[row][col].read();
-        self.buffer.chars[row - 1][col].write(character);
+        let character = unsafe {
+            core::ptr::read_volatile(&self.buffer.chars[row][col] as *const ScreenChar)
+        };
+
+        let ptr = &mut self.buffer.chars[row - 1][col] as *mut ScreenChar;
+        unsafe {
+            core::ptr::write_volatile(ptr, character);
+        }
       }
     }
     self.clear_row(BUFFER_HEIGHT - 1);
@@ -122,7 +146,10 @@ impl Writer {
       color_code: self.color_code,
     };
     for col in 0..BUFFER_WIDTH {
-      self.buffer.chars[row][col].write(blank);
+        let ptr = &mut self.buffer.chars[row][col] as *mut ScreenChar;
+        unsafe {
+            core::ptr::write_volatile(ptr, blank);
+        }
     }
   }
 }
@@ -136,9 +163,8 @@ impl fmt::Write for Writer {
 
 
 lazy_static! {
-  pub static ref WRITER: Mutex<Writer> = Mutex::new(Writer {
-    column_position: 0, color_code: ColorCode::new(Color::Yellow, Color::Black),
-    buffer: unsafe { &mut *(0xb8000 as *mut Buffer) },
-  });
+  pub static ref WRITER: Mutex<Writer> = Mutex::new(Writer::new(
+          ColorCode::new(Color::Yellow, Color::Black)
+  ));
 }