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/** @file
* Exception Handling support specific for AArch64
*
* Copyright (c) 2016 HP Development Company, L.P.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <Uefi.h>
#include <Chipset/AArch64.h>
#include <Library/MemoryAllocationLib.h>
#include <Protocol/DebugSupport.h> // for MAX_AARCH64_EXCEPTION
UINTN gMaxExceptionNumber = MAX_AARCH64_EXCEPTION;
EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };
EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };
PHYSICAL_ADDRESS gExceptionVectorAlignmentMask = ARM_VECTOR_TABLE_ALIGNMENT;
UINTN gDebuggerNoHandlerValue = 0; // todo: define for AArch64
#define EL0_STACK_PAGES 2
VOID
RegisterEl0Stack (
IN VOID *Stack
);
RETURN_STATUS ArchVectorConfig(
IN UINTN VectorBaseAddress
)
{
UINTN HcrReg;
UINT8 *Stack;
Stack = AllocatePages (EL0_STACK_PAGES);
if (Stack == NULL) {
return RETURN_OUT_OF_RESOURCES;
}
RegisterEl0Stack ((UINT8 *)Stack + EFI_PAGES_TO_SIZE (EL0_STACK_PAGES));
if (ArmReadCurrentEL() == AARCH64_EL2) {
HcrReg = ArmReadHcr();
// Trap General Exceptions. All exceptions that would be routed to EL1 are routed to EL2
HcrReg |= ARM_HCR_TGE;
ArmWriteHcr(HcrReg);
}
return RETURN_SUCCESS;
}
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