1 files changed, 83 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Include/IndustryStandard/InstructionParsing.h b/roms/edk2/OvmfPkg/Include/IndustryStandard/InstructionParsing.h
new file mode 100644
index 000000000..149ff328e
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Include/IndustryStandard/InstructionParsing.h
@@ -0,0 +1,83 @@
+/** @file
+  Instruction parsing support definitions.
+
+  Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __INSTRUCTION_PARSING_H__
+#define __INSTRUCTION_PARSING_H__
+
+#include <Base.h>
+#include <Uefi.h>
+
+//
+// Instruction REX prefix definition
+//
+typedef union {
+  struct {
+    UINT8  BitB:1;
+    UINT8  BitX:1;
+    UINT8  BitR:1;
+    UINT8  BitW:1;
+    UINT8  Rex:4;
+  } Bits;
+
+  UINT8  Uint8;
+} INSTRUCTION_REX_PREFIX;
+
+//
+// Instruction ModRM definition
+//
+typedef union {
+  struct {
+    UINT8  Rm:3;
+    UINT8  Reg:3;
+    UINT8  Mod:2;
+  } Bits;
+
+  UINT8  Uint8;
+} INSTRUCTION_MODRM;
+
+//
+// Instruction SIB definition
+//
+typedef union {
+  struct {
+    UINT8  Base:3;
+    UINT8  Index:3;
+    UINT8  Scale:2;
+  } Bits;
+
+  UINT8  Uint8;
+} INSTRUCTION_SIB;
+
+//
+// Legacy Instruction Prefixes
+//
+#define OVERRIDE_SEGMENT_CS          0x2E
+#define OVERRIDE_SEGMENT_DS          0x3E
+#define OVERRIDE_SEGMENT_ES          0x26
+#define OVERRIDE_SEGMENT_SS          0x36
+#define OVERRIDE_SEGMENT_FS          0x64
+#define OVERRIDE_SEGMENT_GS          0x65
+#define OVERRIDE_OPERAND_SIZE        0x66
+#define OVERRIDE_ADDRESS_SIZE        0x67
+#define LOCK_PREFIX                  0xF0
+#define REPNZ_PREFIX                 0xF2
+#define REPZ_PREFIX                  0xF3
+
+//
+// REX Prefixes
+//
+#define REX_PREFIX_START             0x40
+#define REX_PREFIX_STOP              0x4F
+#define REX_64BIT_OPERAND_SIZE_MASK  0x08
+
+//
+// Two-byte Opcode Flag
+//
+#define TWO_BYTE_OPCODE_ESCAPE       0x0F
+
+#endif