diff --git a/kernel-rs/src/memory/mod.rs b/kernel-rs/src/memory/mod.rs
index 0ee34685..314b2dbc 100644
--- a/kernel-rs/src/memory/mod.rs
+++ b/kernel-rs/src/memory/mod.rs
@@ -1,14 +1,15 @@
 mod bump;
 mod recycle;
-// mod stack_allocator;
+mod stack_allocator;
 
 use multiboot2;
 use x86::structures::paging::*;
+use x86::*;
 use spin::Mutex;
 
 use self::bump::BumpFrameAllocator;
 use self::recycle::RecycleAllocator;
-// use self::stack_allocator::StackAllocator;
+use self::stack_allocator::StackAllocator;
 
 pub trait FrameAllocator {
     fn allocate_frames(&mut self, size: usize) -> Option<PhysFrame>;
@@ -17,7 +18,7 @@ pub trait FrameAllocator {
 
 pub struct MemoryControler {
     frame_allocator: RecycleAllocator<BumpFrameAllocator>,
-    // stack_allocator: StackAllocator,
+    stack_allocator: StackAllocator,
 }
 
 static MEMORY_CONTROLER: Mutex<Option<MemoryControler>> = Mutex::new(None);
@@ -50,16 +51,19 @@ pub fn init(boot_info: &multiboot2::BootInformation) {
 
     let frame_allocator = RecycleAllocator::new(bump_allocator);
 
-    // let stack_allocator = {
-    //     let stack_alloc_start = heap_end_page + 1;
-    //     let stack_alloc_end = stack_alloc_start + 100;
-    //     let stack_alloc_range = stack_alloc_start..stack_alloc_end + 1;
-    //     StackAllocator::new(stack_alloc_range)
-    // };
+    let heap_end_page =
+        Page::containing_address(VirtAddr::new(::HEAP_START as u32 + ::HEAP_SIZE as u32 - 1));
+
+    let stack_allocator = {
+        let stack_alloc_start = heap_end_page + 1;
+        let stack_alloc_end = stack_alloc_start + 100;
+        let stack_alloc_range = stack_alloc_start..stack_alloc_end + 1;
+        StackAllocator::new(stack_alloc_range)
+    };
 
     *MEMORY_CONTROLER.lock() = Some(MemoryControler {
         frame_allocator,
-        // stack_allocator,
+        stack_allocator,
     });
 }
 
@@ -79,6 +83,14 @@ pub fn deallocate_frames(frame: PhysFrame, count: usize) {
     }
 }
 
+pub fn allocate_stack() {
+    if let Some(ref mut controler) = *MEMORY_CONTROLER.lock() {
+        controler.stack_allocator.allocate_stack()
+    } else {
+        panic!("frame allocator not initialized!");
+    }
+}
+
 /// Init memory module after core
 /// Must be called once, and only once,
 pub fn init_noncore() {
diff --git a/kernel-rs/src/memory/stack_allocator.rs b/kernel-rs/src/memory/stack_allocator.rs
index fb756ce4..ddf17a06 100644
--- a/kernel-rs/src/memory/stack_allocator.rs
+++ b/kernel-rs/src/memory/stack_allocator.rs
@@ -34,7 +34,7 @@ impl StackAllocator {
         StackAllocator { range }
     }
 
-    pub fn alloc_stack<FA: FrameAllocator>(
+    pub fn allocate_stack<FA: FrameAllocator>(
         &mut self,
         active_table: &mut ActivePageTable,
         frame_allocator: &mut FA,
diff --git a/kernel-rs/x86 b/kernel-rs/x86
index f5e4cb87..2a8416d0 160000
--- a/kernel-rs/x86
+++ b/kernel-rs/x86
@@ -1 +1 @@
-Subproject commit f5e4cb879953ebbeba28a1eaa28bf531424e6824
+Subproject commit 2a8416d0af403786d082695d13a0f74cd2b7f216