audk/ArmPkg/Library/ArmLib/ArmV7/ArmV7MPCoreHelper.asm

//
//  Copyright (c) 2011, 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         
//  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 <AsmMacroIoLib.h>
#include <Base.h>
#include <Library/PcdLib.h>
#include <Chipset/ArmV7.h>
#include <AutoGen.h>

  INCLUDE AsmMacroIoLib.inc

  EXPORT    ArmIsScuEnable
  EXPORT    ArmGetScuBaseAddress
    
  AREA ArmV7MPCore, CODE, READONLY

// IN None
// OUT r0 = SCU Base Address
ArmGetScuBaseAddress
  // Read Configuration Base Address Register. ArmCBar cannot be called to get
  // the Configuration BAR as a stack is not necessary setup. The SCU is at the
  // offset 0x0000 from the Private Memory Region.
  mrc   p15, 4, r0, c15, c0, 0
  bx  lr

// IN  None
// OUT r1 = SCU enabled (boolean)
ArmIsScuEnable
  // Read Configuration Base Address Register. ArmCBar cannot be called to get
  // the Configuration BAR as a stack is not necessary setup. The SCU is at the
  // offset 0x0000 from the Private Memory Region.
  mrc   p15, 4, r0, c15, c0, 0
  add   r1, r0, #SCU_CONTROL_OFFSET
  ldr   r1, [r1]
  and   r1, r1, #1
  bx    lr

  END