ArmPkg/Drivers/ArmGic/ArmGicNonSecLib.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2015, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include <Uefi.h>
  16 #include <Library/IoLib.h>
  17 #include <Library/ArmGicLib.h>
  18
  19 VOID
  20 EFIAPI
  21 ArmGicEnableDistributor (
  22   IN  INTN          GicDistributorBase
  23   )
  24 {
  25   ARM_GIC_ARCH_REVISION Revision;
  26
  27   /*
  28    * Enable GIC distributor in Non-Secure world.
  29    * Note: The ICDDCR register is banked when Security extensions are implemented
  30    */
  31   Revision = ArmGicGetSupportedArchRevision ();
  32   if (Revision == ARM_GIC_ARCH_REVISION_2) {
  33     MmioWrite32 (GicDistributorBase + ARM_GIC_ICDDCR, 0x1);
  34   } else {
  35     if (MmioRead32 (GicDistributorBase + ARM_GIC_ICDDCR) & ARM_GIC_ICDDCR_ARE) {
  36       MmioOr32 (GicDistributorBase + ARM_GIC_ICDDCR, 0x2);
  37     } else {
  38       MmioOr32 (GicDistributorBase + ARM_GIC_ICDDCR, 0x1);
  39     }
  40   }
  41 }