diff --git a/Cargo.lock b/Cargo.lock
index a3029e11..bef26da6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -10,7 +10,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bootloader"
-version = "0.2.0-alpha-005"
+version = "0.2.0-beta"
 dependencies = [
  "fixedvec 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "os_bootinfo 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 78da3ffc..87288568 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@ cargo-features = ["publish-lockfile"]
 
 [package]
 name = "bootloader"
-version = "0.2.0-alpha-005"
+version = "0.2.0-beta"
 authors = ["Philipp Oppermann <dev@phil-opp.com>"]
 license = "MIT/Apache-2.0"
 description = "An experimental pure-Rust x86 bootloader."
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 00000000..360fb649
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,27 @@
+#![no_std]
+
+extern crate os_bootinfo;
+
+pub mod bootinfo {
+    pub use os_bootinfo::*;
+}
+
+/// Defines the entry point function.
+///
+/// The function must have the signature `fn(&'static BootInfo) -> !`.
+///
+/// This macro just creates a function named `_start`, which the linker will use as the entry
+/// point. The advantage of using this macro instead of providing an own `_start` function is
+/// that the macro ensures that the function and argument types are correct.
+#[macro_export]
+macro_rules! entry_point {
+    ($path:path) => {
+        #[export_name = "_start"]
+        pub extern "C" fn __impl_start(boot_info: &'static $crate::bootinfo::BootInfo) -> ! {
+            // validate the signature of the program entry point
+            let f: fn(&'static $crate::bootinfo::BootInfo) -> ! = $path;
+
+            f(boot_info)
+        }
+    };
+}
diff --git a/src/second_stage.s b/src/second_stage.s
index 7e31ea75..730380f8 100644
--- a/src/second_stage.s
+++ b/src/second_stage.s
@@ -81,13 +81,7 @@ check_cpu:
     call check_cpuid
     call check_long_mode
 
-disable_irqs:
-    mov al, 0xFF     # Out 0xFF to 0xA1 and 0x21 to disable all IRQs.
-    out 0xA1, al
-    out 0x21, al
-
-    nop
-    nop
+    cli                   # disable interrupts
 
     lidt zero_idt         # Load a zero length IDT so that any NMI causes a triple fault.