Have panic handler print message

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

@@ -2,36 +2,19 @@
 #![no_std]
 #![no_main]
 
-/*
 #[macro_use]
 mod vga_buffer;
-*/
 
 use core::panic::PanicInfo;
 
 #[panic_handler]
-fn panic(_info: &PanicInfo) -> ! {
+fn panic(info: &PanicInfo) -> ! {
+    println!("{info}");
     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

@@ -1,8 +1,6 @@
-use volatile::Volatile;
 use core::fmt;
-use spin::Mutex;
 use lazy_static::lazy_static;
-
+use spin::Mutex;
 
 #[macro_export]
 macro_rules! print {
@@ -18,10 +16,13 @@ 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)]
@@ -48,10 +49,10 @@ pub enum Color {
 
 #[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 +68,8 @@ 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 +79,18 @@ 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 +105,17 @@ 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 {
-          ascii_char: byte, color_code,
-        });
+
+                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 +124,14 @@ 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 +144,10 @@ 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);
+            }
         }
     }
 }
@@ -134,11 +159,7 @@ 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)));
 }
-