more stuff!

.cargo/config.toml

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+[build]
+target = "x86_64-unknown-none"

.gitignore

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+/target
+/tests

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "illuminance"
+version = "1.0.0"

Cargo.toml

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+[package]
+name = "illuminance"
+version = "1.0.0"
+edition = "2024"
+
+[dependencies]

src/arch/mod.rs

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+pub mod x86_64;

src/arch/x86_64/cpu.rs

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+use core::arch::x86_64::__cpuid;
+
+pub fn init() {
+    let cpuid = unsafe { __cpuid(0) };
+
+    let mut vendor = [0u8;12];
+
+    vendor[0..4].copy_from_slice(&cpuid.ebx.to_le_bytes());
+    vendor[4..8].copy_from_slice(&cpuid.edx.to_le_bytes());
+    vendor[8..12].copy_from_slice(&cpuid.ecx.to_le_bytes());
+
+    crate::kprintln!("CPU Vendor: {}", core::str::from_utf8(&vendor).unwrap_or("Unknown"));
+}

src/arch/x86_64/mod.rs

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+pub mod cpu;
+
+pub fn init() {
+    cpu::init();
+}

src/driver/mod.rs

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+pub mod serial;

src/driver/serial.rs

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+use core::arch::asm;
+
+const SERIAL_COM1: u16 = 0x3F8;
+
+pub unsafe fn init() {
+    outb(SERIAL_COM1 + 1, 0x00); // Disable interrupts  
+
+    outb(SERIAL_COM1 + 3, 0x80);
+
+    outb(SERIAL_COM1, 0x03); // 38400 baud (divisor = 3)
+    outb(SERIAL_COM1 + 1, 0x00);
+
+    outb(SERIAL_COM1 + 3, 0x03);
+
+    outb(SERIAL_COM1 + 2, 0xC7);
+
+    outb(SERIAL_COM1 + 4, 0x0B);
+}
+
+pub unsafe fn write_byte(byte: u8) {
+    while (inb(SERIAL_COM1 + 5) & 0x20) == 0 {}
+    outb(SERIAL_COM1, byte);
+}
+
+pub unsafe fn write_bytes(bytes: &[u8]) {
+    for &byte in bytes {
+        write_byte(byte);
+    }
+}
+
+pub unsafe fn write_str(string: &str) {
+    write_bytes(string.as_bytes());
+}
+
+unsafe fn outb(port: u16, value: u8) {
+    asm!(
+        "out dx, al",
+        in("dx") port,
+        in("al") value,
+        options(nostack, nomem, preserves_flags)
+    );
+}
+
+unsafe fn inb(port: u16) -> u8 {
+    let value: u8;
+
+    unsafe {
+        asm!("in al, dx",in("dx") port,out("al") value,options(nostack, nomem, preserves_flags));
+    }
+    
+    value
+}

src/kernel/init.rs

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+pub fn init() {
+    unsafe {
+        crate::driver::serial::init();
+    }
+    crate::arch::x86_64::init();
+}

src/kernel/log.rs

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+use core::fmt::{self, Write};
+
+struct Logger;
+
+impl Write for Logger {
+    fn write_str(&mut self, string: &str) -> fmt::Result {
+        unsafe {
+            crate::driver::serial::write_str(string);
+        }
+
+        Ok(())
+    }
+}
+
+pub fn print(args: fmt::Arguments) {
+    let mut logger = Logger;
+    logger.write_fmt(args).ok();
+}
+
+#[macro_export]
+macro_rules! kprint {
+    ($($arg:tt)*) => {
+        $crate::kernel::log::print(core::format_args!($($arg)*))
+    };
+}
+
+#[macro_export]
+macro_rules! kprintln {
+    () => {
+        $crate::kprint!("\r\n")
+    };
+
+    ($($arg:tt)*) => {
+        $crate::kprint!("{}\r\n", core::format_args!($($arg)*))
+    };
+}

src/kernel/mod.rs

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+pub mod init;
+pub mod log;

src/main.rs

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+#![no_std]
+#![no_main]
+
+mod arch;
+mod driver;
+mod kernel;
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _start() -> ! {
+    kernel::init::init();
+
+    loop {}
+}
+
+#[panic_handler] // providing a panic handler since there is no std
+fn panic(_info: &core::panic::PanicInfo) -> !/*<-- function will never return (loop {} = while True(){})*/ {
+    loop {}
+}