Clear the screen before printing stage 2 welcome message

diff --git a/stage2/src/main.rs b/stage2/src/main.rs
index dcab9938129155ba5003ce45bacafe22bdc504fd..75f787a76be732af69e690d0dc267ee7641aca61 100644 (file)
--- a/stage2/src/main.rs
+++ b/stage2/src/main.rs
@@ -13,7 +13,17 @@ fn panic(_info: &PanicInfo) -> ! {
 #[no_mangle]
 pub extern "C" fn _start() -> ! {
     let vga_buffer = 0xb8000 as *mut u8;
+    let vga_max = 0xf9e;
 
+    // Clear the screen
+    for i in 0..vga_max {
+        unsafe {
+            *vga_buffer.offset(i as isize * 2) = 0x00;
+            *vga_buffer.offset(i as isize * 2 + 1) = 0x07;
+        }
+    }
+
+    // Print welcome message
     for (i, &byte) in HELLO.iter().enumerate() {
         unsafe {
             *vga_buffer.offset(i as isize * 2) = byte;