diff --git a/src/main.rs b/src/main.rs
index c33cf57..899b21d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -235,14 +235,14 @@ fn tls_test() -> Result<(), String> {
 }
 
 fn nmi_test() -> Result<(), String> {
-    use syscall::TimeSpec;
-    let a = TimeSpec{
-        tv_nsec:0,
-        tv_sec:5,
-    };
-    let mut b = TimeSpec::default();
-    let r = syscall::call::nanosleep(&a,&mut b);
-    println!("{r:?}");
+    // use syscall::TimeSpec;
+    // let a = TimeSpec{
+    //     tv_nsec:0,
+    //     tv_sec:5,
+    // };
+    // let mut b = TimeSpec::default();
+    // let r = syscall::call::nanosleep(&a,&mut b);
+    // println!("{r:?}");
 
     let r = syscall::call::nmi();
     println!("{r:?}");
@@ -253,20 +253,21 @@ fn nmi_test() -> Result<(), String> {
     //
     // }
 
-
     // let mut a = 10;
     // while a >=0 {
     //     println!("{}", 4/a);
     //     a-=1;
     // }
-    // let a=1;
-    // let v = std::ptr::addr_of!(a);
-    // println!("{v:?}");
-    // unsafe {
-    //     let r = syscall::call::physunmap(v as usize);
-    //     println!("{r:?}");
-    // }
-    // println!("{a:?}");
+
+
+    // const ADDR: usize = 0xDEADC0DE;
+    // println!("value {}", unsafe { (ADDR as *const u8).read_volatile() });
+    // unsafe{
+    //     syscall::fmap(!0, &Map { offset: 0, address: ALIGNED_ADDR, size: PAGE_SIZE, flags: MapFlags::MAP_FIXED_NOREPLACE | MapFlags::MAP_PRIVATE | MapFlags::PROT_READ | MapFlags::PROT_WRITE }).expect("[signal handler]: failed to re-map address");
+    //     (ADDR as *mut u8).write_volatile(42);
+    // };
+    // println!("value {}", unsafe { (ADDR as *const u8).read_volatile() });
+
     Ok(())
 }
 fn main() {