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ArmPkg: Configure TTBCR register

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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>
This commit is contained in:
Evan Lloyd
2016-03-02 21:08:46 +00:00
committed by Leif Lindholm
parent eea222ced0
commit ff1f27c055
4 changed files with 32 additions and 4 deletions
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7
ArmPkg/Library/ArmLib/Common/Arm/ArmLibSupport.asm
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@@ -1,7 +1,7 @@
//------------------------------------------------------------------------------
//
// Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
// Copyright (c) 2011 - 2014, ARM Limited. All rights reserved.
// Copyright (c) 2011 - 2016, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
@@ -85,6 +85,11 @@
isb
bx lr
RVCT_ASM_EXPORT ArmSetTTBCR
mcr p15, 0, r0, c2, c0, 2
isb
bx lr
RVCT_ASM_EXPORT ArmGetTTBR0BaseAddress
mrc p15,0,r0,c2,c0,0
LoadConstantToReg(0xFFFFC000, r1)