Add reset code

src/stop.rs

@@ -1,6 +1,23 @@
 use acpi;
 use syscall::io::{Io, Pio};
 
+#[no_mangle]
+pub unsafe extern fn kreset() -> ! {
+    println!("kreset");
+
+    // 8042 reset
+    {
+        println!("Reset with 8042");
+        let mut port = Pio::<u8>::new(0x64);
+        while port.readf(2) {}
+        port.write(0xFE);
+    }
+
+    // TODO: Use triple fault to guarantee reset
+
+    unreachable!();
+}
+
 #[no_mangle]
 pub unsafe extern fn kstop() -> ! {
     println!("kstop");
@@ -22,7 +39,7 @@ pub unsafe extern fn kstop() -> ! {
                     }
                 }
             }
-            
+
             println!("Shutdown with ACPI outw(0x{:X}, 0x{:X})", port, val);
             Pio::<u16>::new(port).write(val);
         }

src/syscall/process.rs

@@ -20,7 +20,7 @@ use scheme::{self, FileHandle};
 use syscall;
 use syscall::data::{SigAction, Stat};
 use syscall::error::*;
-use syscall::flag::{CLONE_VFORK, CLONE_VM, CLONE_FS, CLONE_FILES, CLONE_SIGHAND, O_CLOEXEC, SIG_DFL, WNOHANG};
+use syscall::flag::{CLONE_VFORK, CLONE_VM, CLONE_FS, CLONE_FILES, CLONE_SIGHAND, O_CLOEXEC, SIG_DFL, SIGTERM, WNOHANG};
 use syscall::validate::{validate_slice, validate_slice_mut};
 
 pub fn brk(address: usize) -> Result<usize> {
@@ -963,13 +963,18 @@ pub fn exit(status: usize) -> ! {
         }
 
         if pid == ContextId::from(1) {
-            println!("Main kernel thread exited with status {:X}, calling kstop", status);
+            println!("Main kernel thread exited with status {:X}", status);
 
             extern {
+                fn kreset() -> !;
                 fn kstop() -> !;
             }
 
-            unsafe { kstop(); }
+            if status == SIGTERM {
+                unsafe { kreset(); }
+            } else {
+                unsafe { kstop(); }
+            }
         }
     }