refactor: unsafe only in adapter + libkos; forbid(unsafe_code) everywhere else; libkos Window (volatile, bounds-checked MMIO/DMA/shared mem), entry!, thread::spawn; MapRegion returns pages; kernel const-built (with_cores/install_platform); newtype addrs

crates/apps/sleep/src/main.rs

@@ -1,6 +1,7 @@
 //! Waits: `sleep <seconds>`. Mostly something to stop with Ctrl+C.
 
 #![no_std]
+#![forbid(unsafe_code)]
 #![no_main]
 
 extern crate libkos;
@@ -11,8 +12,9 @@ use types::time::Ticks;
 /// QEMU virt's timebase.
 const TICKS_PER_SECOND: u64 = 10_000_000;
 
-#[unsafe(no_mangle)]
-extern "C" fn main() {
+libkos::entry!(main);
+
+fn main() {
     let Some(seconds) = libkos::start::args().nth(1).and_then(|s| s.parse::<u64>().ok()) else {
         println!("usage: sleep <seconds>");
         return;