diff options
Diffstat (limited to 'MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c')
-rw-r--r-- | MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c b/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c new file mode 100644 index 0000000..8221be6 --- /dev/null +++ b/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c @@ -0,0 +1,63 @@ +/** @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 - 2010, Intel Corporation. All rights reserved.<BR>
+
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+#include "ScriptExecute.h"
+//
+// INTERRUPT_GATE_DESCRIPTOR and SetIdtEntry () are used to setup IDT to do debug
+//
+
+#pragma pack(1)
+
+typedef struct {
+ UINT16 OffsetLow;
+ UINT16 SegmentSelector;
+ UINT16 Attributes;
+ UINT16 OffsetHigh;
+} INTERRUPT_GATE_DESCRIPTOR;
+
+#define INTERRUPT_GATE_ATTRIBUTE 0x8e00
+
+#pragma pack()
+/**
+ 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
+ )
+{
+ INTERRUPT_GATE_DESCRIPTOR *IdtEntry;
+ IA32_DESCRIPTOR *IdtDescriptor;
+ UINTN S3DebugBuffer;
+
+ //
+ // Restore IDT for debug
+ //
+ IdtDescriptor = (IA32_DESCRIPTOR *) (UINTN) (AcpiS3Context->IdtrProfile);
+ IdtEntry = (INTERRUPT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (3 * sizeof (INTERRUPT_GATE_DESCRIPTOR)));
+ S3DebugBuffer = (UINTN) (AcpiS3Context->S3DebugBufferAddress);
+
+ IdtEntry->OffsetLow = (UINT16)S3DebugBuffer;
+ IdtEntry->SegmentSelector = (UINT16)AsmReadCs ();;
+ IdtEntry->Attributes = (UINT16)INTERRUPT_GATE_ATTRIBUTE;
+ IdtEntry->OffsetHigh = (UINT16)(S3DebugBuffer >> 16);
+
+ AsmWriteIdtr (IdtDescriptor);
+}
+
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