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/.cargo/config.toml |  5 +++++
 kernel/Cargo.toml         | 12 ++++++++++++
 kernel/src/lib.rs         | 23 +++++++++++++++++++++++
 3 files changed, 40 insertions(+)
 create mode 100644 kernel/.cargo/config.toml
 create mode 100644 kernel/Cargo.toml
 create mode 100644 kernel/src/lib.rs

(limited to 'kernel')

diff --git a/kernel/.cargo/config.toml b/kernel/.cargo/config.toml
new file mode 100644
index 0000000..a26e254
--- /dev/null
+++ b/kernel/.cargo/config.toml
@@ -0,0 +1,5 @@
+
+[unstable]
+build-std = ["core", "compiler_builtins"]
+[build]
+target = "i686-lisibleos.json"
diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
new file mode 100644
index 0000000..1ca49e6
--- /dev/null
+++ b/kernel/Cargo.toml
@@ -0,0 +1,12 @@
+
+
+[package]
+name = "kernel"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type = ["staticlib"]
+
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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