mirror of https://github.com/acidanthera/audk.git
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/** @file
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Set a IDT entry for debug purpose
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Set a IDT entry for interrupt vector 3 for debug purpose for IA32 platform
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "ScriptExecute.h"
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//
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// INTERRUPT_GATE_DESCRIPTOR and SetIdtEntry () are used to setup IDT to do debug
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//
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#pragma pack(1)
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typedef struct {
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UINT16 OffsetLow;
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UINT16 SegmentSelector;
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UINT16 Attributes;
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UINT16 OffsetHigh;
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} INTERRUPT_GATE_DESCRIPTOR;
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#define INTERRUPT_GATE_ATTRIBUTE 0x8e00
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#pragma pack()
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/**
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Set a IDT entry for interrupt vector 3 for debug purpose.
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@param AcpiS3Context a pointer to a structure of ACPI_S3_CONTEXT
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**/
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VOID
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SetIdtEntry (
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IN ACPI_S3_CONTEXT *AcpiS3Context
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)
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{
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INTERRUPT_GATE_DESCRIPTOR *IdtEntry;
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IA32_DESCRIPTOR *IdtDescriptor;
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UINTN S3DebugBuffer;
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//
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// Restore IDT for debug
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//
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IdtDescriptor = (IA32_DESCRIPTOR *) (UINTN) (AcpiS3Context->IdtrProfile);
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IdtEntry = (INTERRUPT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (3 * sizeof (INTERRUPT_GATE_DESCRIPTOR)));
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S3DebugBuffer = (UINTN) (AcpiS3Context->S3DebugBufferAddress);
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IdtEntry->OffsetLow = (UINT16)S3DebugBuffer;
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IdtEntry->SegmentSelector = (UINT16)AsmReadCs ();;
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IdtEntry->Attributes = (UINT16)INTERRUPT_GATE_ATTRIBUTE;
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IdtEntry->OffsetHigh = (UINT16)(S3DebugBuffer >> 16);
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AsmWriteIdtr (IdtDescriptor);
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}
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