diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c')
| -rw-r--r-- | roms/edk2/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/roms/edk2/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c b/roms/edk2/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c new file mode 100644 index 000000000..1e3c5b849 --- /dev/null +++ b/roms/edk2/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/SetIdtEntry.c @@ -0,0 +1,56 @@ +/** @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.<BR>
+
+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);
+ }
+ );
+}
+
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