add memory allocation for thread stack

Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>

src/proc/thread/mod.rs

@@ -1,3 +1,17 @@
+use alloc::alloc::{alloc, dealloc, Layout};
+
+const STACK_SIZE: usize = 4096 * 20;
+
 pub struct Thread {
     rsp: u64
 }
+
+impl Thread {
+    pub fn new() -> Self {
+        unsafe {
+            Thread {
+                rsp: alloc(Layout::new::<[u8; STACK_SIZE]>()) as u64,
+            }
+        }
+    }
+}