1 /** @file 2 Set a IDT entry for debug purpose 3 4 Set a IDT entry for interrupt vector 3 for debug purpose for IA32 platform 5 6 Copyright (c) 2013-2015 Intel Corporation. 7 8 This program and the accompanying materials 9 are licensed and made available under the terms and conditions of the BSD License 10 which accompanies this distribution. The full text of the license may be found at 11 http://opensource.org/licenses/bsd-license.php 12 13 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 14 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 15 16 **/ 17 #include "ScriptExecute.h" 18 // 19 // INTERRUPT_GATE_DESCRIPTOR and SetIdtEntry () are used to setup IDT to do debug 20 // 21 22 #pragma pack(1) 23 24 typedef struct { 25 UINT16 OffsetLow; 26 UINT16 SegmentSelector; 27 UINT16 Attributes; 28 UINT16 OffsetHigh; 29 } INTERRUPT_GATE_DESCRIPTOR; 30 31 #define INTERRUPT_GATE_ATTRIBUTE 0x8e00 32 33 #pragma pack() 34 /** 35 Set a IDT entry for interrupt vector 3 for debug purpose. 36 37 @param AcpiS3Context a pointer to a structure of ACPI_S3_CONTEXT 38 39 **/ 40 VOID 41 SetIdtEntry ( 42 IN ACPI_S3_CONTEXT *AcpiS3Context 43 ) 44 { 45 INTERRUPT_GATE_DESCRIPTOR *IdtEntry; 46 IA32_DESCRIPTOR *IdtDescriptor; 47 UINTN S3DebugBuffer; 48 49 // 50 // Restore IDT for debug 51 // 52 IdtDescriptor = (IA32_DESCRIPTOR *) (UINTN) (AcpiS3Context->IdtrProfile); 53 IdtEntry = (INTERRUPT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (3 * sizeof (INTERRUPT_GATE_DESCRIPTOR))); 54 S3DebugBuffer = (UINTN) (AcpiS3Context->S3DebugBufferAddress); 55 56 IdtEntry->OffsetLow = (UINT16)S3DebugBuffer; 57 IdtEntry->SegmentSelector = (UINT16)AsmReadCs (); 58 IdtEntry->Attributes = (UINT16)INTERRUPT_GATE_ATTRIBUTE; 59 IdtEntry->OffsetHigh = (UINT16)(S3DebugBuffer >> 16); 60 61 AsmWriteIdtr (IdtDescriptor); 62 } 63 64
