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 
ArchVectorConfig(IN UINTN VectorBaseAddress)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 }
45