ArmPlatformPkg/ArmVExpressPkg/ArmVExpressDxe/AArch64/ArmFvpDxeAArch64.c

   1 /** @file
   2
   3   Copyright (c) 2014-2015, ARM Ltd. All rights reserved.
   4
   5   This program and the accompanying materials are licensed and made available
   6   under the terms and conditions of the BSD License which accompanies this
   7   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, WITHOUT
  11   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "ArmVExpressInternal.h"
  16
  17 //
  18 // Description of the two AARCH64 model platforms :
  19 // just the platform id for the time being.
  20 // Platform ids are defined in ArmVExpressInternal.h for
  21 // all "ArmVExpress-like" platforms (AARCH64 or ARM architecture,
  22 // model or hardware platforms).
  23 //
  24 CONST ARM_VEXPRESS_PLATFORM ArmVExpressPlatforms[] = {
  25   { ARM_FVP_VEXPRESS_AEMv8x4 },
  26   { ARM_FVP_BASE_AEMv8x4_AEMv8x4 },
  27   { ARM_FVP_FOUNDATION },
  28   { ARM_FVP_VEXPRESS_UNKNOWN }
  29 };
  30
  31 /**
  32   Get information about the VExpress platform the firmware is running on.
  33
  34   @param[out]  Platform   Address where the pointer to the platform information
  35                           (type ARM_VEXPRESS_PLATFORM*) should be stored.
  36                           The returned pointer does not point to an allocated
  37                           memory area.
  38
  39   @retval  EFI_SUCCESS    The platform information was returned.
  40   @retval  EFI_NOT_FOUND  The platform was not recognised.
  41
  42 **/
  43 EFI_STATUS
  44 ArmVExpressGetPlatform (
  45   OUT CONST ARM_VEXPRESS_PLATFORM** Platform
  46   )
  47 {
  48   EFI_STATUS            Status;
  49   UINT32                SysId;
  50
  51   ASSERT (Platform != NULL);
  52
  53   Status = EFI_NOT_FOUND;
  54
  55   SysId = MmioRead32 (ARM_VE_SYS_ID_REG);
  56   if (SysId != ARM_RTSM_SYS_ID) {
  57     // Take out the FVP GIC variant to reduce the permutations. The GIC driver
  58     // detects the version and does the right thing.
  59     SysId &= ~ARM_FVP_SYS_ID_VARIANT_MASK;
  60     if (SysId == (ARM_FVP_BASE_SYS_ID & ~ARM_FVP_SYS_ID_VARIANT_MASK)) {
  61       Status = ArmVExpressGetPlatformFromId (ARM_FVP_BASE_AEMv8x4_AEMv8x4, Platform);
  62     } else if (SysId == (ARM_FVP_FOUNDATION_SYS_ID & ~ARM_FVP_SYS_ID_VARIANT_MASK)) {
  63       Status = ArmVExpressGetPlatformFromId (ARM_FVP_FOUNDATION, Platform);
  64     }
  65   } else {
  66     Status = ArmVExpressGetPlatformFromId (ARM_FVP_VEXPRESS_AEMv8x4, Platform);
  67   }
  68
  69   if (EFI_ERROR (Status)) {
  70     DEBUG ((EFI_D_ERROR, "Unsupported AArch64 RTSM (SysId:0x%X).\n", SysId));
  71     ASSERT_EFI_ERROR (Status);
  72   }
  73
  74   return Status;
  75 }