From 8a7d29213915c9ccb975f4710e17aa9ac6194121 Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@cs.stanford.edu>
Date: Wed, 1 Sep 2004 22:52:13 +0000
Subject: [PATCH] Set CR0_WP in CR0.

---
 src/threads/loader.S | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/threads/loader.S b/src/threads/loader.S
index 535c442..41289d1 100644
--- a/src/threads/loader.S
+++ b/src/threads/loader.S
@@ -17,6 +17,7 @@
 #define CR0_PE 0x00000001      /* Protection Enable. */
 #define CR0_EM 0x00000004      /* (Floating-point) Emulation. */
 #define CR0_PG 0x80000000      /* Paging. */
+#define CR0_WP 0x00010000      /* Write-Protect enable in kernel mode. */
 
 .globl start				# Entry point	
 start:	.code16				# This runs in real mode
@@ -165,9 +166,9 @@ read_sector:
 	addl $0x1000, %eax
 	loop 1b
 
-	# Turn on paging.
+	# Turn on paging and kernel write-protect.
 	movl %cr0, %eax
-	orl $CR0_PG, %eax
+	orl $CR0_PG | CR0_WP, %eax
 	movl %eax, %cr0
 	jmp 1f
 1:
-- 
2.30.2