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) 2006 - 2013, Intel Corporation. All rights reserved.<BR> 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 /** 20 Set a IDT entry for interrupt vector 3 for debug purpose. 21 22 @param AcpiS3Context a pointer to a structure of ACPI_S3_CONTEXT 23 24 **/ 25 VOID SetIdtEntry(IN ACPI_S3_CONTEXT * AcpiS3Context)26SetIdtEntry ( 27 IN ACPI_S3_CONTEXT *AcpiS3Context 28 ) 29 { 30 IA32_IDT_GATE_DESCRIPTOR *IdtEntry; 31 IA32_DESCRIPTOR *IdtDescriptor; 32 UINTN S3DebugBuffer; 33 EFI_STATUS Status; 34 35 // 36 // Restore IDT for debug 37 // 38 IdtDescriptor = (IA32_DESCRIPTOR *) (UINTN) (AcpiS3Context->IdtrProfile); 39 AsmWriteIdtr (IdtDescriptor); 40 41 // 42 // Setup the default CPU exception handlers 43 // 44 Status = InitializeCpuExceptionHandlers (NULL); 45 ASSERT_EFI_ERROR (Status); 46 47 DEBUG_CODE ( 48 // 49 // Update IDT entry INT3 if the instruction is valid in it 50 // 51 S3DebugBuffer = (UINTN) (AcpiS3Context->S3DebugBufferAddress); 52 if (*(UINTN *)S3DebugBuffer != (UINTN) -1) { 53 IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (3 * sizeof (IA32_IDT_GATE_DESCRIPTOR))); 54 IdtEntry->Bits.OffsetLow = (UINT16)S3DebugBuffer; 55 IdtEntry->Bits.Selector = (UINT16)AsmReadCs (); 56 IdtEntry->Bits.Reserved_0 = 0; 57 IdtEntry->Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32; 58 IdtEntry->Bits.OffsetHigh = (UINT16)(S3DebugBuffer >> 16); 59 } 60 ); 61 } 62 63