From ff1f27c055c9dd78eb457bbf8cb7511060e3ee0b Mon Sep 17 00:00:00 2001
From: Evan Lloyd <evan.lloyd@arm.com>
Date: Wed, 2 Mar 2016 21:08:46 +0000
Subject: ArmPkg: Configure TTBCR register

Architecturally, the TTBCR register value is undefined at reset for
Non-Secure.
On some platforms the reset value for TTBCR is not zero and
this causes a data abort exception once the MMU is enabled.

This patch configures the TTBCR register to enable translation table
walk using TTBR0.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
---
 ArmPkg/Include/Library/ArmLib.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'ArmPkg/Include/Library')

diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index 85fa1f600b..15f610d82e 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -1,7 +1,7 @@
 /** @file
 
   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-  Copyright (c) 2011 - 2015, ARM Ltd. All rights reserved.<BR>
+  Copyright (c) 2011 - 2016, ARM Ltd. All rights reserved.<BR>
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -353,6 +353,12 @@ ArmSetTTBR0 (
   IN  VOID  *TranslationTableBase
   );
 
+VOID
+EFIAPI
+ArmSetTTBCR (
+  IN  UINT32 Bits
+  );
+
 VOID *
 EFIAPI
 ArmGetTTBR0BaseAddress (
-- 
cgit v1.2.3