From 7d7bf0daafd35f5a4da603bff5301128e404b5db Mon Sep 17 00:00:00 2001
From: Erin <erin@hashbang.sh>
Date: Sun, 4 Jun 2017 15:49:05 -0500
Subject: [PATCH] boot.asm: recursively map p4[511] -> p4

---
 src/arch/x86_64/boot.asm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/arch/x86_64/boot.asm b/src/arch/x86_64/boot.asm
index bff6700..2881b75 100644
--- a/src/arch/x86_64/boot.asm
+++ b/src/arch/x86_64/boot.asm
@@ -89,6 +89,11 @@ check_long_mode:
 	jmp error
 
 setup_ptables:
+	; p4[511] -> p4 (recursive!)
+	mov eax, p4_table
+	or eax, 0b11 ; present + writable
+	mov [p4_table + 511*8], eax
+
 	; p4[0] -> p3
 	mov eax, p3_table
 	or eax, 0b11 ; present + writable