Initial commit

.cargo/config

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+[build]
+target = "x86_64-fefos.json"
+
+[target.'cfg(target_os = "none")']
+runner = "bootimage runner"

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "bootloader"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb7239572eacd7c74ac0d6c75eb87a615058d6497a667728694e0d32b7bd5a20"
+
+[[package]]
+name = "fefos"
+version = "0.1.0"
+dependencies = [
+ "bootloader",
+]

Cargo.toml

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+[package]
+name = "fefos"
+version = "0.1.0"
+authors = ["Quinten Kock <quinten@quinten.space>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bootloader = "0.9.3"

src/main.rs

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+#![no_std]
+#![no_main]
+
+static HELLO: &[u8] = b"Hello Rust!";
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop {}
+}
+
+#[no_mangle]
+pub extern "C" fn _start() -> ! {
+    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 {}
+}

x86_64-fefos.json

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+{
+    "llvm-target": "x86_64-unknown-none",
+    "data-layout": "e-m:e-i64:64-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"
+}