From 4f834ef5c9b4a11cded64582a8541eac7a27c6dc Mon Sep 17 00:00:00 2001
From: Yifan Wu <shinbokuow@163.com>
Date: Fri, 9 Jul 2021 08:10:39 +0800
Subject: [PATCH] Modify clear_bss

---
 os/src/main.rs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/os/src/main.rs b/os/src/main.rs
index b43c79ad..936986f3 100644
--- a/os/src/main.rs
+++ b/os/src/main.rs
@@ -21,9 +21,12 @@ fn clear_bss() {
         fn sbss();
         fn ebss();
     }
-    (sbss as usize..ebss as usize).for_each(|a| {
-        unsafe { (a as *mut u8).write_volatile(0) }
-    });
+    unsafe {
+        core::slice::from_raw_parts_mut(
+            sbss as usize as *mut u8, 
+            ebss as usize - sbss as usize,
+        ).fill(0);
+    }
 }
 
 #[no_mangle]