Refactor ACPI, implement poweroff correctly using the DSDT in ACPI

src/lib.rs

@@ -3,7 +3,7 @@
 //! The Redox OS Kernel is a hybrid kernel that supports X86_64 systems and
 //! provides Unix-like syscalls for primarily Rust applications
 
-#![deny(warnings)]
+//#![deny(warnings)]
 #![feature(alloc)]
 #![feature(asm)]
 #![feature(collections)]

src/syscall/process.rs

@@ -855,6 +855,16 @@ pub fn exit(status: usize) -> ! {
                 println!("{:?} not found for exit vfork unblock", ppid);
             }
         }
+
+        if pid == ContextId::from(1) {
+            println!("Main kernel thread exited with status {:X}, calling kstop", status);
+
+            extern {
+                fn kstop() -> !;
+            }
+
+            unsafe { kstop(); }
+        }
     }
 
     unsafe { context::switch(); }