Add Rust example. Closes #73

programs/rust.rs

@@ -0,0 +1,74 @@
+// Rust on BareMetal - Tested with Rust 0.13.0-nightly
+// rustc -O --crate-type lib -o rust.o --emit obj rust.rs
+// ld -T app.ld -o rust.app rust.o
+
+#![no_std]
+#![allow(ctypes)]
+
+#![feature(lang_items)]
+#[lang="sized"]
+trait Sized {}
+
+enum Color {
+    Black       = 0,
+    Red         = 1,
+    Green       = 2,
+    Blue        = 3,
+    Yellow      = 4,
+    Purple      = 5,
+    Cyan        = 6,
+    LightGray   = 7,
+    DarkGray    = 8,
+    LightRed    = 9,
+    LightGreen  = 10,
+    LightBlue   = 11,
+    LightYellow = 12,
+    LightPurple = 13,
+    LightCyan   = 14,
+    White       = 15,
+}
+
+enum Option<T> {
+    None,
+    Some(T)
+}
+
+struct IntRange {
+    cur: int,
+    max: int
+}
+
+impl IntRange {
+    fn next(&mut self) -> Option<int> {
+        if self.cur < self.max {
+            self.cur += 1;
+            Some(self.cur - 1)
+        } else {
+            None
+        }
+    }
+}
+
+fn range(lo: int, hi: int) -> IntRange {
+    IntRange { cur: lo, max: hi }
+}
+
+fn clear_screen(background: Color) {
+    let mut r = range(0, 80 * 25);
+    loop {
+        match r.next() {
+            Some(x) => {
+                unsafe {
+                   *((0xb8000 + x * 2) as *mut u16) = (background as u16) << 12;
+                }
+            },
+            None => {break}
+        }
+    }
+}
+
+#[no_mangle]
+#[no_split_stack]
+pub fn main() {
+    clear_screen(LightRed);
+}