init: add a check_magic function

.clang-format

@@ -1,12 +0,0 @@
----
-BasedOnStyle: Microsoft
-CompactNamespaces: 'false'
-FixNamespaceComments: 'false'
-NamespaceIndentation: All
-AllowShortBlocksOnASingleLine: 'true'
-AllowShortCaseLabelsOnASingleLine: 'true'
-AllowShortFunctionsOnASingleLine: None
-AllowShortIfStatementsOnASingleLine: Always
-AllowShortLambdasOnASingleLine: All
-AllowShortLoopsOnASingleLine: 'true'
-PointerAlignment: Left

.gitignore

@@ -2,4 +2,5 @@ Luna.iso
 toolchain/
 .vscode/
 initrd/boot/
-moon/target/**
+moon/target/**
+**/Cargo.lock

moon/src/init.rs

@@ -0,0 +1,7 @@
+use crate::bootboot::{BOOTBOOT, BOOTBOOT_MAGIC};
+use crate::util::get_bootboot;
+
+pub fn check_magic() -> () {
+    let boot: BOOTBOOT = get_bootboot();
+    assert_eq!(boot.magic, BOOTBOOT_MAGIC[..4]);
+}

moon/src/main.rs

@@ -5,9 +5,13 @@ mod video;
 mod bootboot;
 mod panic;
 mod util;
+mod init;
+
+use video::Color;
 
 #[no_mangle]
 pub extern "C" fn _start() -> ! {
-    video::clear(0xffffffff);
+    init::check_magic();
+    video::clear(Color::White);
     loop {}
-}
+}

moon/src/video.rs

@@ -1,27 +1,51 @@
+#![allow(dead_code)]
+
 use crate::bootboot::{BOOTBOOT, BOOTBOOT_FB};
 use crate::util::get_bootboot;
 
 use BOOTBOOT_FB as FB;
 
-pub fn put_pixel(x: u32, y: u32, color: u32) -> () {
-    let boot: BOOTBOOT = get_bootboot();
-    let ptr: u64 = FB + (boot.fb_scanline * y) as u64 + (x * 4) as u64;
-    unsafe { *(ptr as *mut u32) = color };
+#[allow(dead_code)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(u32)]
+pub enum Color {
+    Black = 0x00000000,
+    Blue = 0xff0000ff,
+    Green = 0xff00ff00,
+    Cyan = 0xff00ffff,
+    Red = 0xffff0000,
+    Magenta = 0xffff00ff,
+    Brown = 0xff231709,
+    LightGray = 0xffb9b8b5,
+    DarkGray = 0xff808080,
+    LightBlue = 0xff317ecc,
+    LightGreen = 0xff6aab8e,
+    LightCyan = 0xffe0ffff,
+    LightRed = 0xffff7377,
+    Pink = 0xffffc0cb,
+    Yellow = 0xffffff00,
+    White = 0xffffffff,
 }
 
-pub fn draw_rect(x: u32, y: u32, width: u32, height: u32, color: u32) -> () {
+pub fn put_pixel(x: u32, y: u32, color: Color) -> () {
+    let boot: BOOTBOOT = get_bootboot();
+    let ptr: u64 = FB + (boot.fb_scanline * y) as u64 + (x * 4) as u64;
+    unsafe { *(ptr as *mut u32) = color as u32 };
+}
+
+pub fn draw_rect(x: u32, y: u32, width: u32, height: u32, color: Color) -> () {
     let boot: BOOTBOOT = get_bootboot();
     for i in y..(y + height)
     {
         let addr: u64 = FB + (boot.fb_scanline * i) as u64 + (x * 4) as u64;
         for ptr in (addr..(addr + (width*4) as u64)).step_by(4)
         {
-            unsafe { *(ptr as *mut u32) = color };
+            unsafe { *(ptr as *mut u32) = color as u32 };
         }
     }
 }
 
-pub fn clear(color: u32) -> () {
+pub fn clear(color: Color) -> () {
     let boot: BOOTBOOT = get_bootboot();
     draw_rect(0, 0, boot.fb_width, boot.fb_height, color)
 }