ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.S

   1 //
   2 //  Copyright (c) 2011-2012, ARM Limited. All rights reserved.
   3 //
   4 //  This program and the accompanying materials
   5 //  are licensed and made available under the terms and conditions of the BSD License
   6 //  which accompanies this distribution.  The full text of the license may be found at
   7 //  http://opensource.org/licenses/bsd-license.php
   8 //
   9 //  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 //  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 //
  12 //
  13
  14 #include <AsmMacroIoLib.h>
  15
  16 // IN None
  17 // OUT r0 = SCU Base Address
  18 ASM_FUNC(ArmGetScuBaseAddress)
  19   // Read Configuration Base Address Register. ArmCBar cannot be called to get
  20   // the Configuration BAR as a stack is not necessary setup. The SCU is at the
  21   // offset 0x0000 from the Private Memory Region.
  22   mrc   p15, 4, r0, c15, c0, 0
  23   bx  lr