From 23e8270a60891c3b2978bebe9b2fcccc93293623 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Wed, 2 Sep 2015 20:36:03 +0200
Subject: [PATCH] Enable the no-execute feature in page tables

---
 src/arch/x86_64/boot.asm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/arch/x86_64/boot.asm b/src/arch/x86_64/boot.asm
index bdfdb820..382d12e8 100644
--- a/src/arch/x86_64/boot.asm
+++ b/src/arch/x86_64/boot.asm
@@ -68,7 +68,8 @@ enable_paging:
     ; set the long mode bit in the EFER MSR (model specific register)
     mov ecx, 0xC0000080
     rdmsr
-    or eax, 1 << 8
+    or eax, 1 << 8    ; enable long mode
+    or eax, 1 << 11   ; enable no-execute bit in page tables
     wrmsr
 
     ; enable paging in the cr0 register