From 2f8efad24a2dd3d68dee5e82c36fb375eb8a70a6 Mon Sep 17 00:00:00 2001
From: clizia <xanthippe@cock.lu>
Date: Mon, 25 Aug 2025 01:47:42 +0200
Subject: [PATCH] it now boots and prints hello world

---
 .cargo/config.toml |  9 +++++++++
 Cargo.toml         |  1 +
 src/main.rs        | 13 ++++++++++++-
 x86_64-totos.json  | 16 ++++++++++++++++
 4 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 .cargo/config.toml
 create mode 100644 x86_64-totos.json

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..f95e6aa
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,9 @@
+[unstable]
+build-std-features = ["compiler-builtins-mem"]
+build-std = ["core", "compiler_builtins"]
+
+[build]
+target = "x86_64-totos.json"
+
+[target.'cfg(target_os = "none")']
+runner = "bootimage runner"
diff --git a/Cargo.toml b/Cargo.toml
index 60e9fc5..4f6eaa3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,3 +15,4 @@ panic = "abort" # disable stack unwinding on panic
 panic = "abort" # disable stack unwinding on panic
 
 [dependencies]
+bootloader = "0.9"
diff --git a/src/main.rs b/src/main.rs
index 132c4cc..8d80305 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,11 +3,22 @@
 
 use core::panic::PanicInfo;
 
+static HELLO: &[u8] = b"Hello toto :3";
+
 // this function is the entry point since the linker
 // looks for a function named `_start` by default
 #[unsafe(no_mangle)]
 pub extern "C" fn _start() -> ! {
-    loop{}
+    let vga_buffer = 0xb8000 as *mut u8;
+
+    for (i, &byte) in HELLO.iter().enumerate() {
+        unsafe {
+            *vga_buffer.offset(i as isize * 2) = byte;
+            *vga_buffer.offset(i as isize * 2 + 1) = 0xb;
+        }
+    }
+
+    loop {}
 }
 
 // called on panic
diff --git a/x86_64-totos.json b/x86_64-totos.json
new file mode 100644
index 0000000..669ca9d
--- /dev/null
+++ b/x86_64-totos.json
@@ -0,0 +1,16 @@
+{
+    "llvm-target": "x86_64-unknown-none",
+    "data-layout": "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128",
+    "arch": "x86_64",
+    "target-endian": "little",
+    "target-pointer-width": "64",
+    "target-c-int-width": 32,
+    "os": "none",
+    "executables": true,
+    "linker-flavor": "ld.lld",
+    "linker": "rust-lld",
+    "panic-strategy": "abort",
+    "disable-redzone": true,
+    "features": "-mmx,-sse,+soft-float",
+    "rustc-abi": "x86-softfloat"
+}