ArmPkg/Library/ArmExceptionLib/AArch64/AArch64Exception.c

   1 /** @file
   2 *  Exception Handling support specific for AArch64
   3 *
   4 *  Copyright (c) 2016 HP Development Company, L.P.
   5 *
   6 *  This program and the accompanying materials
   7 *  are licensed and made available under the terms and conditions of the BSD License
   8 *  which accompanies this distribution.  The full text of the license may be found at
   9 *  http://opensource.org/licenses/bsd-license.php
  10 *
  11 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 *
  14 **/
  15
  16 #include <Uefi.h>
  17
  18 #include <Chipset/AArch64.h>
  19
  20 #include <Protocol/DebugSupport.h> // for MAX_AARCH64_EXCEPTION
  21
  22 UINTN                   gMaxExceptionNumber = MAX_AARCH64_EXCEPTION;
  23 EFI_EXCEPTION_CALLBACK  gExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };
  24 EFI_EXCEPTION_CALLBACK  gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };
  25 PHYSICAL_ADDRESS        gExceptionVectorAlignmentMask = ARM_VECTOR_TABLE_ALIGNMENT;
  26 UINTN                   gDebuggerNoHandlerValue = 0; // todo: define for AArch64
  27
  28 RETURN_STATUS ArchVectorConfig(
  29   IN  UINTN       VectorBaseAddress
  30   )
  31 {
  32   UINTN             HcrReg;
  33
  34   if (ArmReadCurrentEL() == AARCH64_EL2) {
  35     HcrReg = ArmReadHcr();
  36
  37     // Trap General Exceptions. All exceptions that would be routed to EL1 are routed to EL2
  38     HcrReg |= ARM_HCR_TGE;
  39
  40     ArmWriteHcr(HcrReg);
  41   }
  42
  43   return RETURN_SUCCESS;
  44 }