/** @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.
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 ( // // 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); } ); }