ArmPkg/Library/ArmLib/ArmV7/ArmV7MPCoreHelper.asm

   1 //
   2 //  Copyright (c) 2011, 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 <Base.h>
  16 #include <Library/PcdLib.h>
  17 #include <Chipset/ArmV7.h>
  18 #include <AutoGen.h>
  19
  20   INCLUDE AsmMacroIoLib.inc
  21
  22   EXPORT    ArmIsScuEnable
  23   EXPORT    ArmGetScuBaseAddress
  24
  25   AREA ArmV7MPCore, CODE, READONLY
  26
  27 // IN None
  28 // OUT r0 = SCU Base Address
  29 ArmGetScuBaseAddress
  30   // Read Configuration Base Address Register. ArmCBar cannot be called to get
  31   // the Configuration BAR as a stack is not necessary setup. The SCU is at the
  32   // offset 0x0000 from the Private Memory Region.
  33   mrc   p15, 4, r0, c15, c0, 0
  34   bx\s\slr
  35
  36 // IN  None
  37 // OUT r1 = SCU enabled (boolean)
  38 ArmIsScuEnable
  39   // Read Configuration Base Address Register. ArmCBar cannot be called to get
  40   // the Configuration BAR as a stack is not necessary setup. The SCU is at the
  41   // offset 0x0000 from the Private Memory Region.
  42   mrc   p15, 4, r0, c15, c0, 0
  43   add   r1, r0, #SCU_CONTROL_OFFSET
  44   ldr   r1, [r1]
  45   and   r1, r1, #1
  46   bx    lr
  47
  48   END