/** @file
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* Exception Handling support specific for AArch64
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*
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* Copyright (c) 2016 HP Development Company, L.P.
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* Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
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*
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* SPDX-License-Identifier: BSD-2-Clause-Patent
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*
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**/
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#include <Uefi.h>
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#include <Chipset/AArch64.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Protocol/DebugSupport.h> // for MAX_AARCH64_EXCEPTION
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UINTN gMaxExceptionNumber = MAX_AARCH64_EXCEPTION;
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EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };
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EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };
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PHYSICAL_ADDRESS gExceptionVectorAlignmentMask = ARM_VECTOR_TABLE_ALIGNMENT;
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UINTN gDebuggerNoHandlerValue = 0; // todo: define for AArch64
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#define EL0_STACK_SIZE EFI_PAGES_TO_SIZE(2)
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STATIC UINTN mNewStackBase[EL0_STACK_SIZE / sizeof (UINTN)];
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VOID
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RegisterEl0Stack (
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IN VOID *Stack
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);
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RETURN_STATUS
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ArchVectorConfig (
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IN UINTN VectorBaseAddress
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)
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{
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UINTN HcrReg;
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// Round down sp by 16 bytes alignment
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RegisterEl0Stack (
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(VOID *)(((UINTN)mNewStackBase + EL0_STACK_SIZE) & ~0xFUL)
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);
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if (ArmReadCurrentEL() == AARCH64_EL2) {
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HcrReg = ArmReadHcr();
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// Trap General Exceptions. All exceptions that would be routed to EL1 are routed to EL2
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HcrReg |= ARM_HCR_TGE;
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ArmWriteHcr(HcrReg);
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}
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return RETURN_SUCCESS;
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}
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