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/** @file
Set a IDT entry for debug purpose
Set a IDT entry for interrupt vector 3 for debug purpose for IA32 platform
Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "ScriptExecute.h"
/**
Set a IDT entry for interrupt vector 3 for debug purpose.
@param AcpiS3Context a pointer to a structure of ACPI_S3_CONTEXT
**/
VOID
SetIdtEntry (
IN ACPI_S3_CONTEXT *AcpiS3Context
)
{
IA32_IDT_GATE_DESCRIPTOR *IdtEntry;
IA32_DESCRIPTOR *IdtDescriptor;
UINTN S3DebugBuffer;
EFI_STATUS Status;
//
// Restore IDT for debug
//
IdtDescriptor = (IA32_DESCRIPTOR *)(UINTN)(AcpiS3Context->IdtrProfile);
AsmWriteIdtr (IdtDescriptor);
//
// Setup the default CPU exception handlers
//
Status = InitializeCpuExceptionHandlers (NULL);
ASSERT_EFI_ERROR (Status);
DEBUG_CODE_BEGIN ();
//
// Update IDT entry INT3 if the instruction is valid in it
//
S3DebugBuffer = (UINTN)(AcpiS3Context->S3DebugBufferAddress);
if (*(UINTN *)S3DebugBuffer != (UINTN)-1) {
IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (3 * sizeof (IA32_IDT_GATE_DESCRIPTOR)));
IdtEntry->Bits.OffsetLow = (UINT16)S3DebugBuffer;
IdtEntry->Bits.Selector = (UINT16)AsmReadCs ();
IdtEntry->Bits.Reserved_0 = 0;
IdtEntry->Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;
IdtEntry->Bits.OffsetHigh = (UINT16)(S3DebugBuffer >> 16);
}
DEBUG_CODE_END ();
}
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