Centralize global scheme constructors.

src/main.rs

@@ -178,6 +178,9 @@ fn kmain(cpu_count: u32, bootstrap: Bootstrap) -> ! {
     //Initialize the first context, stored in kernel/src/context/mod.rs
     context::init();
 
+    //Initialize global schemes, such as `acpi:`.
+    scheme::init_globals();
+
     let pid = syscall::getpid();
     info!("BSP: {:?} {}", pid, cpu_count);
     info!("Env: {:?}", ::core::str::from_utf8(bootstrap.env));

src/scheme/mod.rs

@@ -496,3 +496,12 @@ impl GlobalSchemes {
         SchemeId::new(self as usize)
     }
 }
+
+#[cold]
+pub fn init_globals() {
+    #[cfg(all(feature = "acpi", any(target_arch = "x86", target_arch = "x86_64")))]
+    {
+        AcpiScheme::init();
+    }
+    IrqScheme::init();
+}