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