handler asm code for saving the volatile registers created

interrupt/handlers.asm

@@ -11,4 +11,27 @@ handle_keyboard_asm:
 	; continue. The C++ compiler will only generates code to preserve
 	; non-scratch registers in the high-level interrupt handler -- the scratch
 	; registers have to be saved (and restored later) manually!
-	; TODO(12): Implement the context save and restore for the keyboard interrupt
+	; TODO: Implement the context save and restore for the keyboard interrupt
+  ;
+  ;
+    push rax;
+    push rdi;
+    push rsi;
+    push rdx;
+    push rcx;
+    push r8;
+    push r9;
+    push r10;
+    push r11;
+    call handle_keyboard;
+    pop r11;
+    pop r10;
+    pop r9;
+    pop r8;
+    pop rcx;
+    pop rdx;
+    pop rsi; 
+    pop rdi;
+    pop rax;
+
+    iret ;