ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.asm

   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 #include <Library/ArmCpuLib.h>
  16 #include <Chipset/ArmCortexA9.h>
  17
  18   INCLUDE AsmMacroExport.inc
  19   INCLUDE AsmMacroIoLib.inc
  20
  21
  22   PRESERVE8
  23
  24 // IN None
  25 // OUT r0 = SCU Base Address
  26  RVCT_ASM_EXPORT ArmGetScuBaseAddress
  27   // Read Configuration Base Address Register. ArmCBar cannot be called to get
  28   // the Configuration BAR as a stack is not necessary setup. The SCU is at the
  29   // offset 0x0000 from the Private Memory Region.
  30   mrc   p15, 4, r0, c15, c0, 0
  31   bx  lr
  32
  33   END