From 25a24b8b167a7cb28c622039ea30e4afd166cd83 Mon Sep 17 00:00:00 2001
From: Clément Sibille <claymeuns@protonmail.com>
Date: Mon, 4 Oct 2021 13:30:31 +0200
Subject: Make kernel print hello world using the VGA text buffer

---
 kernel/src/lib.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 kernel/src/lib.rs

(limited to 'kernel/src/lib.rs')

diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
new file mode 100644
index 0000000..285ecff
--- /dev/null
+++ b/kernel/src/lib.rs
@@ -0,0 +1,23 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+#[no_mangle]
+pub extern "C" fn kmain() -> ! {
+    let vga_buffer = 0xb8000 as *mut u8;
+
+    for (i, &byte) in b"LisibleOS Hello world".iter().enumerate() {
+        unsafe {
+            *vga_buffer.offset(i as isize * 2) = byte;
+            *vga_buffer.offset(i as isize * 2 + 1) = 0xb;
+        }
+    }
+
+    loop {}
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}
\ No newline at end of file
-- 
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