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Intel® 64 and IA-32 Architectures
Software Developer’s Manual
Combined Volumes:
1, 2A, 2B, 2C, 3A, 3B and 3C
NOTE: This document contains all seven volumes of the Intel 64 and IA-32 Architectures Software
Developer's Manual: Basic Architecture, Instruction Set Reference A-L, Instruction Set Reference M-Z,
Instruction Set Reference, and the System Programming Guide, Parts 1, 2 and 3. Refer to all seven
volumes when evaluating your design needs.
Order Number: 325462-046US
March 2013
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL
OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND
CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTIC-
ULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
A "Mission Critical Application" is any application in which failure of the Intel Product could result, directly or indirectly, in personal injury or death.
SHOULD YOU PURCHASE OR USE INTEL'S PRODUCTS FOR ANY SUCH MISSION CRITICAL APPLICATION, YOU SHALL INDEMNIFY AND HOLD INTEL
AND ITS SUBSIDIARIES, SUBCONTRACTORS AND AFFILIATES, AND THE DIRECTORS, OFFICERS, AND EMPLOYEES OF EACH, HARMLESS AGAINST
ALL CLAIMS COSTS, DAMAGES, AND EXPENSES AND REASONABLE ATTORNEYS' FEES ARISING OUT OF, DIRECTLY OR INDIRECTLY, ANY CLAIM OF
PRODUCT LIABILITY, PERSONAL INJURY, OR DEATH ARISING IN ANY WAY OUT OF SUCH MISSION CRITICAL APPLICATION, WHETHER OR NOT
INTEL OR ITS SUBCONTRACTOR WAS NEGLIGENT IN THE DESIGN, MANUFACTURE, OR WARNING OF THE INTEL PRODUCT OR ANY OF ITS PARTS.
Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or char-
acteristics of any features or instructions marked "reserved" or "undefined". Intel reserves these for future definition and shall have no responsi-
bility whatsoever for conflicts or incompatibilities arising from future changes to them. The information here is subject to change without notice.
Do not finalize a design with this information.
The products described in this document may contain design defects or errors known as errata which may cause the product to deviate from
published specifications. Current characterized errata are available on request.
Intel
®
AES-NI requires a computer system with an AES-NI enabled processor, as well as non-Intel software to execute the instructions in the
correct sequence. AES-NI is available on select Intel
®
processors. For availability, consult your reseller or system manufacturer. For more in-
formation, see http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-instructions-aes-ni/
.
Intel
®
Hyper-Threading Technology (Intel
®
HT Technology) is available on select Intel
®
Core™ processors. Requires an Intel
®
HT Technology-
enabled system. Consult your PC manufacturer. Performance will vary depending on the specific hardware and software used. For more infor-
mation including details on which processors support HT Technology, visit http://www.intel.com/info/hyperthreading
.
Intel
®
Virtualization Technology requires a computer system with an enabled Intel
®
processor, BIOS, and virtual machine monitor (VMM). Func-
tionality, performance or other benefits will vary depending on hardware and software configurations. Software applications may not be com-
patible with all operating systems. Consult your PC manufacturer. For more information, visit http://www.intel.com/go/virtualization
.
Intel
®
64 architecture Requires a system with a 64-bit enabled processor, chipset, BIOS and software. Performance will vary depending on the
specific hardware and software you use. Consult your PC manufacturer for more information. For more information, visit http://www.in-
tel.com/info/em64t.
Enabling Execute Disable Bit functionality requires a PC with a processor with Execute Disable Bit capability and a supporting operating system.
Check with your PC manufacturer on whether your system delivers Execute Disable Bit functionality.
Intel, the Intel logo, Pentium, Xeon, Intel NetBurst, Intel Core, Intel Core Solo, Intel Core Duo, Intel Core 2 Duo, Intel Core 2 Extreme, Intel
Pentium D, Itanium, Intel SpeedStep, MMX, Intel Atom, and VTune are trademarks of Intel Corporation in the U.S. and/or other countries.
*Other names and brands may be claimed as the property of others.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an order number and are referenced in this document, or other Intel literature, may be obtained by calling 1-
800-548-4725, or go to: http://www.intel.com/design/literature.htm
Copyright © 1997-2013 Intel Corporation. All rights reserved.
Intel® 64 and IA-32 Architectures
Software Developer’s Manual
Volume 1:
Basic Architecture
NOTE: The Intel
®
64 and IA-32 Architectures Software Developer's Manual consists of seven volumes:
Basic Architecture, Order Number 253665; Instruction Set Reference A-L, Order Number 253666;
Instruction Set Reference M-Z, Order Number 253667; Instruction Set Reference, Order Number
326018; System Programming Guide, Part 1, Order Number 253668; System Programming Guide, Part
2, Order Number 253669; System Programming Guide, Part 3, Order Number 326019. Refer to all seven
volumes when evaluating your design needs.
Order Number: 253665-046US
March 2013
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL
OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND
CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTIC-
ULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
A "Mission Critical Application" is any application in which failure of the Intel Product could result, directly or indirectly, in personal injury or death.
SHOULD YOU PURCHASE OR USE INTEL'S PRODUCTS FOR ANY SUCH MISSION CRITICAL APPLICATION, YOU SHALL INDEMNIFY AND HOLD INTEL
AND ITS SUBSIDIARIES, SUBCONTRACTORS AND AFFILIATES, AND THE DIRECTORS, OFFICERS, AND EMPLOYEES OF EACH, HARMLESS AGAINST
ALL CLAIMS COSTS, DAMAGES, AND EXPENSES AND REASONABLE ATTORNEYS' FEES ARISING OUT OF, DIRECTLY OR INDIRECTLY, ANY CLAIM OF
PRODUCT LIABILITY, PERSONAL INJURY, OR DEATH ARISING IN ANY WAY OUT OF SUCH MISSION CRITICAL APPLICATION, WHETHER OR NOT
INTEL OR ITS SUBCONTRACTOR WAS NEGLIGENT IN THE DESIGN, MANUFACTURE, OR WARNING OF THE INTEL PRODUCT OR ANY OF ITS PARTS.
Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or char-
acteristics of any features or instructions marked "reserved" or "undefined". Intel reserves these for future definition and shall have no responsi-
bility whatsoever for conflicts or incompatibilities arising from future changes to them. The information here is subject to change without notice.
Do not finalize a design with this information.
The products described in this document may contain design defects or errors known as errata which may cause the product to deviate from
published specifications. Current characterized errata are available on request.
Intel
®
AES-NI requires a computer system with an AES-NI enabled processor, as well as non-Intel software to execute the instructions in the
correct sequence. AES-NI is available on select Intel
®
processors. For availability, consult your reseller or system manufacturer. For more in-
formation, see http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-instructions-aes-ni/
.
Intel
®
Hyper-Threading Technology (Intel
®
HT Technology) is available on select Intel
®
Core™ processors. Requires an Intel
®
HT Technology-
enabled system. Consult your PC manufacturer. Performance will vary depending on the specific hardware and software used. For more infor-
mation including details on which processors support HT Technology, visit http://www.intel.com/info/hyperthreading
.
Intel
®
Virtualization Technology requires a computer system with an enabled Intel
®
processor, BIOS, and virtual machine monitor (VMM). Func-
tionality, performance or other benefits will vary depending on hardware and software configurations. Software applications may not be com-
patible with all operating systems. Consult your PC manufacturer. For more information, visit http://www.intel.com/go/virtualization
.
Intel
®
64 architecture Requires a system with a 64-bit enabled processor, chipset, BIOS and software. Performance will vary depending on the
specific hardware and software you use. Consult your PC manufacturer for more information. For more information, visit http://www.in-
tel.com/info/em64t.
Enabling Execute Disable Bit functionality requires a PC with a processor with Execute Disable Bit capability and a supporting operating system.
Check with your PC manufacturer on whether your system delivers Execute Disable Bit functionality.
Intel, the Intel logo, Pentium, Xeon, Intel NetBurst, Intel Core, Intel Core Solo, Intel Core Duo, Intel Core 2 Duo, Intel Core 2 Extreme, Intel
Pentium D, Itanium, Intel SpeedStep, MMX, Intel Atom, and VTune are trademarks of Intel Corporation in the U.S. and/or other countries.
*Other names and brands may be claimed as the property of others.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an order number and are referenced in this document, or other Intel literature, may be obtained by calling 1-
800-548-4725, or go to: http://www.intel.com/design/literature.htm
Copyright © 1997-2013 Intel Corporation. All rights reserved.
Vol. 1 iii
CONTENTS
PAGE
CHAPTER 1
ABOUT THIS MANUAL
1.1 INTEL
®
64 AND IA-32 PROCESSORS COVERED IN THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 OVERVIEW OF VOLUME 1: BASIC ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3 NOTATIONAL CONVENTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.3.1 Bit and Byte Order. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
1.3.2 Reserved Bits and Software Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
1.3.2.1 Instruction Operands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.3.3 Hexadecimal and Binary Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.3.4 Segmented Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.3.5 A New Syntax for CPUID, CR, and MSR Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
1.3.6 Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
1.4 RELATED LITERATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
CHAPTER 2
INTEL
®
64 AND IA-32 ARCHITECTURES
2.1 BRIEF HISTORY OF INTEL
®
64 AND IA-32 ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.1 16-bit Processors and Segmentation (1978) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.1.2 The Intel
®
286 Processor (1982). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.1.3 The Intel386
™
Processor (1985) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.1.4 The Intel486
™
Processor (1989) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.1.5 The Intel
®
Pentium
®
Processor (1993). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.1.6 The P6 Family of Processors (1995-1999) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.1.7 The Intel
®
Pentium
®
4 Processor Family (2000-2006). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.1.8 The Intel
®
Xeon
®
Processor (2001- 2007). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.1.9 The Intel
®
Pentium
®
M Processor (2003-Current) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.1.10 The Intel
®
Pentium
®
Processor Extreme Edition (2005-2007) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
2.1.11 The Intel
®
Core
™
Duo and Intel
®
Core
™
Solo Processors (2006-2007) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
2.1.12 The Intel
®
Xeon
®
Processor 5100, 5300 Series and Intel
®
Core
™
2 Processor Family (2006-Current) . . . . . . . . . . . . . . . .2-4
2.1.13 The Intel
®
Xeon
®
Processor 5200, 5400, 7400 Series and Intel
®
Core
™
2 Processor Family (2007-Current). . . . . . . . . .2-5
2.1.14 The Intel
®
Atom
™
Processor Family (2008-Current) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2.1.15 The Intel
®
Core
™
i7 Processor Family (2008-Current) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2.1.16 The Intel
®
Xeon
®
Processor 7500 Series (2010) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2.1.17 2010 Intel
®
Core
™
Processor Family (2010) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2.1.18 The Intel
®
Xeon
®
Processor 5600 Series (2010) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2.1.19 Second Generation Intel
®
Core
™
Processor Family (2011) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2.2 MORE ON SPECIFIC ADVANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.2.1 P6 Family Microarchitecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2.2.2 Intel NetBurst
®
Microarchitecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
2.2.2.1 The Front End Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
2.2.2.2 Out-Of-Order Execution Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.2.2.3 Retirement Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.2.3 Intel
®
Core
™
Microarchitecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.2.3.1 The Front End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.2.3.2 Execution Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.2.4 Intel
®
Atom
™
Microarchitecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.2.5 Intel
®
Microarchitecture Code Name Nehalem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.2.6 Intel
®
Microarchitecture Code Name Sandy Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.2.7 SIMD Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.2.8 Intel® Hyper-Threading Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.2.8.1 Some Implementation Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.2.9 Multi-Core Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
2.2.10 Intel
®
64 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
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