ArmPkg: introduce base ArmMmuLib implementation

This base library encapsulates the MMU manipulation routines that have been
factored out of ArmLib. The functionality covers initial creation of the 1:1
mapping in the page tables, and remapping regions to change permissions or
cacheability attributes.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibV7Support.asm

@@ -0,0 +1,32 @@
+//------------------------------------------------------------------------------
+//
+// Copyright (c) 2016, Linaro Limited. All rights reserved.
+//
+// This program and the accompanying materials
+// are licensed and made available under the terms and conditions of the BSD License
+// which accompanies this distribution.  The full text of the license may be found at
+// http://opensource.org/licenses/bsd-license.php
+//
+// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+//
+//------------------------------------------------------------------------------
+
+
+
+    INCLUDE AsmMacroExport.inc
+
+
+//------------------------------------------------------------------------------
+
+ RVCT_ASM_EXPORT ArmHasMpExtensions
+  mrc     p15,0,R0,c0,c0,5
+  // Get Multiprocessing extension (bit31)
+  lsr     R0, R0, #31
+  bx      LR
+
+ RVCT_ASM_EXPORT ArmReadIdMmfr0
+  mrc    p15, 0, r0, c0, c1, 4     ; Read ID_MMFR0 Register
+  bx     lr
+
+  END