The kernel should now write the string Hello, World! into a vga-compatible text buffer located at 0xb8000. Now I need to write the bootloader to launch the kernel and ensure this text buffer exists.

1 files changed, 10 insertions, 0 deletions

diff --git a/kernel/src/main.rs b/kernel/src/main.rs
index 397296e..bca5686 100644
--- a/kernel/src/main.rs
+++ b/kernel/src/main.rs
@@ -3,6 +3,8 @@
 
 use core::panic::PanicInfo;
 
+static HELLO: &[u8] = b"Hello, World!";
+
 #[panic_handler]
 fn panic(_info: &PanicInfo) -> ! {
     loop {}
@@ -10,5 +12,13 @@ fn panic(_info: &PanicInfo) -> ! {
 
 #[unsafe(no_mangle)]
 pub extern "C" fn _start() -> ! {
+    let gob_buffer = 0xb8000 as *mut u8;
+
+    for (i, &byte) in HELLO.iter().enumerate() {
+        unsafe {
+            *gob_buffer.offset(i as isize * 2) = byte; // Puts the ASCII char into the buffer
+            *gob_buffer.offset(i as isize * 2 + 1) = 0xb; // Colors it white on black
+        }
+    }
     loop {}
 }