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ACPI

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2704: 453: 1122: 436: 1189:'s best friend". He goes on to say, "Your biggest mistake is to assume that the NSA is the only institution abusing this position of trust – in fact, it's reasonable to assume that all firmware is a cesspool of insecurity, courtesy of incompetence of the highest degree from manufacturers, and competence of the highest degree from a very wide range of such agencies." He suggests 444: 1066:
The tables allow description of system hardware in a platform-independent manner, and are presented as either fixed-formatted data structures or in AML. The main AML table is the DSDT (differentiated system description table). The AML can be decompiled by tools like Intel's iASL (open-source, part of
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The 2.4 series of the Linux kernel had only minimal support for ACPI, with better support implemented (and enabled by default) from kernel version 2.6.0 onwards. Old ACPI BIOS implementations tend to be quite buggy, and consequently are not supported by later operating systems. For example,
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Once an OSPM-compatible operating system activates ACPI, it takes exclusive control of all aspects of power management and device configuration. The OSPM implementation must expose an ACPI-compatible environment to device drivers, which exposes certain system, device and processor states.
199:(PnP) Specification. ACPI brings power management under the control of the operating system, as opposed to the previous BIOS-centric system that relied on platform-specific firmware to determine power management and configuration policies. The specification is central to the 464:
was the first operating system to implement ACPI, but its implementation was somewhat buggy or incomplete, although some of the problems associated with it were caused by the first-generation ACPI hardware. Other operating systems, including later versions of
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have a fixed function interface defined by Intel, which provides a set of core functionality that reduces an ACPI-compliant system's need for full driver stacks for providing basic functionality during boot time or in the case of major system failure.
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says ACPI is a security risk. He says "arguing for ACPI on your next-generation device is arguing for a trojan horse of monumental proportions to be installed in your living room and in your data centre" and "firmware on your device is the
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The "It's now safe to turn off your computer" screen in Windows NT 4.0. Unlike Windows 9x and later NT releases, most of the essential computer peripherals are working normally, so the user can opt to restart instead of powering off their
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ACPI-compliant systems interact with hardware through either a "Function Fixed Hardware (FFH) Interface", or a platform-independent hardware programming model which relies on platform-specific ACPI Machine Language (AML) provided by the
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for the AML bytecode. A reference AML interpreter implementation is provided by the ACPI Component Architecture (ACPICA). At the BIOS development time, AML bytecode is compiled from the ASL (ACPI Source Language) code.
3523: 894:, but maintains other state. Some processors have variations on the C3 state (Deep Sleep, Deeper Sleep, etc.) that differ in how long it takes to wake the processor. This processor state is optional. 439:
The "It's now safe to turn off your computer" screen in Windows 9x. Most of the computer peripherals are offline, and the only ways to exit this screen are to power off or reset the computer.
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The computer's power has been totally removed via a mechanical switch (as on the rear of a PSU). The power cord can be removed and the system is safe for disassembly (typically, only the
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shipped PCs with Windows Update disabled. Windows versions older than Windows 7 do not support this feature, but alternative techniques can be used. This behavior has been compared to
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Processor caches are flushed, and the CPU(s) stops executing instructions. The power to the CPU(s) and RAM is maintained. Peripherals such as monitor and hard disk may be turned off.
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A custom ACPI table called the Windows Platform Binary Table (WPBT) is used by Microsoft to allow vendors to add software into the Windows OS automatically. Some vendors, such as
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The firmware-level ACPI has three main components: the ACPI tables, the ACPI BIOS, and the ACPI registers. The ACPI BIOS generates ACPI tables and loads ACPI tables into
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Function Fixed Hardware interfaces are platform-specific features, provided by platform manufacturers for the purposes of performance and failure recovery. Standard
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also participated later. In October 2013, ACPI Special Interest Group (ACPI SIG), the original developers of the ACPI standard, agreed to transfer all assets to the
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state: the state of an operating system which does not support ACPI. In this state, the hardware and power are not managed via ACPI, effectively disabling ACPI.
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only use ACPI if the BIOS date is after January 1, 1999. Similarly, Linux kernel 2.6 may not use ACPI if the BIOS date is before January 1, 2001.
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The computer is running and the CPU executes instructions. "Awaymode" is a subset of S0, where monitor is off but background tasks are running
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The ACPI Specification defines the following four global "Gx" states and six sleep "Sx" states for an ACPI-compliant computer system:
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ACPI Platform Error Interface (APEI) is a specification for reporting of hardware errors, e.g. chipset, RAM to the operating system.
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platform-independent reference implementation of the operating system–related ACPI code. The ACPICA code is used by Linux,
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Released in June 2009, revision 4.0 of the ACPI specification added various new features to the design; most notable are the
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The Root System Description Pointer (RSDP) is located in a platform-dependent manner, and describes the rest of the tables.
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and user-presence devices, as well as extending the thermal model beyond the previous processor-centric support.
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remains powered. Most peripherals are turned off. Fans are usually turned off. Requires GPU drivers on Windows.
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or Enhanced Halt State) for lower power consumption, however this proved to be buggy on some systems.
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address support as well as support for multiprocessor workstations and servers with revision 2.0.
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The first revision of the ACPI specification was released in December 1996, supporting 16, 24 and
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would benefit from ACPI without them having to do work and suggested to make it Windows-only.
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In September 2004, revision 3.0 was released, bringing to the ACPI specification support for
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While a device or processor operates (D0 and C0, respectively), it can be in one of several
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being successively lower-performance states, up to an implementation-specific limit of
316: 196: 187:), and status monitoring. It was first released in December 1996. ACPI aims to replace 118: 1853: 1377:"ACPI Device Tree - Representation of ACPI Namespace — The Linux Kernel documentation" 420:
Revision 5.0 of the ACPI specification was released in December 2011, which added the
5421: 5388: 5304: 5236: 5137: 5127: 5117: 5048: 5043: 5038: 4961: 4890: 4796: 4756: 4389: 4339: 4289: 4265: 4147: 4087: 4082: 3964: 3880: 3648: 3489: 3158: 3151: 2937: 2324: 2059: 2049: 1779: 1768: 1634: 1318: 1181: 1036: 812:: A device can assert power management requests to transition to higher power states. 621:, or "Low Power S0 Idle". Partial processor SoC sleep. Known to ARM and x86 devices. 510: 452: 285: 220: 172: 5591: 5524: 5510: 5365: 5272: 5226: 5033: 5028: 5023: 5018: 5013: 5003: 4873: 4840: 4751: 4746: 4655: 4507: 4502: 4485: 4473: 4412: 3976: 3954: 3840: 3818: 3736: 3532: 3454: 3401: 3394: 2980: 2902: 2312: 1052: 969: 421: 224: 176: 168: 131: 2048:. Ellen Siever, Ellen Siever (5th ed.). Beijing: O'Reilly. 2005. p. 36. 1818: 443: 5505: 5490: 5438: 5342: 5317: 5154: 5147: 4998: 4993: 4988: 4927: 4835: 4825: 4547: 4382: 4334: 4097: 3981: 3949: 3850: 3845: 3766: 3330: 2888: 2743: 2591: 2237: 1630: 1256: 1227: 891: 733: 309: 273: 255: 250:), which the kernel parses. ACPI then executes the desired operations written in 2519: 2288: 230:
Internally, ACPI advertises the available components and their functions to the
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ACPICA) for purposes like patching the tables for expanding OS compatibility.
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ACPI defines many tables that provide the interface between an ACPI-compliant
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Linux-based operating systems can provide handling of ACPI events via acpid.
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The latest specification revision is 6.5, which was released in August 2022.
180: 179:(e.g. putting unused hardware components to sleep), auto configuration (e.g. 164: 4270: 2598:; EFI/ASL code itself is from the open source Intel EFI Development Kit II ( 2415: 1661: 5621: 5559: 5375: 5352: 5164: 4885: 3823: 3582: 3577: 3308: 3074: 2826: 2544: 1555: 1205: 537: 184: 2233: 2043: 1260: 1077:, have been caught using this feature to install harmful software such as 517:, have at least some support for ACPI. Some newer operating systems, like 5406: 5370: 5081: 5053: 4911: 4766: 3689: 3440: 3376: 3039: 2991: 1798: 1687:"Advanced Configuration and Power Interface Specification (Revision 5.1)" 1651:"Advanced Configuration and Power Interface Specification (Revision 5.0)" 1243: 1190: 641: 474: 395: 297: 2207: 1716:"Limitations When Using Microsoft Windows 98 on Compaq Armada Portables" 456:
The "It's now safe to power off the system" screen in Windows 10 and 11.
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Everything You Need to Know About the CPU C-States Power Saving Modes
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Overall design decision was not without criticism. In November 2003,
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addressing spaces. It was not until August 2000 that ACPI received
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are intermediate power-states whose definition varies by device.
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are defined by manufacturers for some processors. For example,
486: 478: 414: 369: 365: 349: 277: 2456:"Zombie Crapware: How the Windows Platform Binary Table Works" 1208:—described ACPI as "a complete design disaster in every way". 532:
Windows operating systems use acpi.sys to access ACPI events.
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Operating System-directed configuration and Power Management
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has the device powered off and unresponsive to its bus.
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Windows 98 Does Not Support ACPI Passive Cooling Mode
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support. The revision 5.1 was released in July 2014.
340:), mainly written by Intel's engineers, provides an 1741:"Windows 98 on ThinkPad systems - ThinkPad General" 2125: 1767: 1142: 3547:Advanced Configuration and Power Interface (ACPI) 2323: 1759: 5634: 3533:Computer processor power management technologies 2529: 2527: 2099: 1394: 2449: 2447: 2287:. September 2, 2004. p. 23. Archived from 736:continues to run using its own small battery). 413:support, logical processor idling support, and 211:interfaces between the device's firmware (e.g. 3017: 2386:"ACPI Tables — The Linux Kernel documentation" 1721:. physik.hu-berlin.de. October 1998. p. 3 1462: 1429: 1427: 3705: 3517: 2626: 2524: 2490: 2360:Brown, Len (July 20, 2005). "ACPI in Linux". 2444: 1465:"ATARE: ACPI Tables and Regular Expressions" 4710:Computer performance by orders of magnitude 1424: 1197:firmware (ACPI or non-ACPI) as a solution. 3719: 3712: 3698: 3524: 3510: 3228: 2633: 2619: 2533:Linux Magazine issue 162, May 2014, page 9 2090:ACPI Spec Rev 5.0 - dated December 6, 2011 2011: 2009: 1145:. Please do not remove this message until 780:states for intermediate levels on the SoC. 157:Advanced Configuration and Power Interface 29:Advanced Configuration and Power Interface 2518:Mark Shuttleworth blog (March 17, 2014), 2369: 2234:"Intel's Pentium 4 600 series processors" 1770:Using Microsoft Windows 2000 Professional 1486: 1484: 1165:Learn how and when to remove this message 272:originally developed the standard, while 2640: 1623: 1141:Relevant discussion may be found on the 554: 451: 442: 434: 2453: 2102:"Intel's Haswell Architecture Analyzed" 2006: 1927: 1551:"Microsoft wollte ACPI nur fĂĽr Windows" 1491:ACPI implementation on FreeBSD - Usenix 1255: 798:: The D3 state is further divided into 5635: 2542: 2329:"Intel Processor Vendor-Specific ACPI" 2231: 2172:"How to achieve S0ix states in Linux*" 1495: 1481: 402:support for more than 256 processors, 5648:Unified Extensible Firmware Interface 3693: 3505: 2614: 2359: 2252:"Processor Package and Core C-States" 2016:The State of ACPI in the Linux Kernel 1766:Robert Cowart; Brian Knittel (2000). 1604: 866:, also support an Enhanced C1 state ( 4681:Floating-point operations per second 2491:Mayank Sharma (September 27, 2021). 2169: 2100:Anand Lal Shimpi (October 5, 2012). 1957: 1743:. Support.lenovo.com. Archived from 1526:"Readme for the ACPI Driver Package" 1115: 1107:Software Licensing Description Table 924: 430: 328:ACPI Component Architecture (ACPICA) 16:Computer firmware interface standard 2545:"Linus & the Lunatics, Part II" 2232:Wasson, Scott (February 21, 2005). 1988:"Acpi.sys: The Windows ACPI Driver" 1514:ACPICA: ACPI Component Architecture 828: 13: 5653:Application programming interfaces 2520:"ACPI, firmware and your security" 2454:Hoffman, Chris (August 19, 2015). 1939:from the original on July 21, 2011 1854:"FreeBSD 5.0-RELEASE Announcement" 1249: 699:, and the system is powered down. 171:can use to discover and configure 14: 5684: 2563: 2543:Searls, Doc (November 25, 2003). 742:The specification also defines a 5607:Semiconductor device fabrication 2702: 2170:Wang, Wendy (October 17, 2018). 1928:Therien, Guy (January 6, 2000). 1904:"acpi(4) - OpenBSD manual pages" 1605:Gates, Bill (January 24, 1999). 1120: 1101:Platform Health Assessment Table 749: 568: 5582:History of general-purpose CPUs 3809:Nondeterministic Turing machine 3552:Advanced Power Management (APM) 2536: 2512: 2484: 2466: 2426: 2408: 2378: 2353: 2317: 2306: 2270: 2244: 2225: 2200: 2182: 2163: 2145: 2119: 2093: 2084: 2036: 2020: 1980: 1951: 1921: 1896: 1879:"acpi(4) - NetBSD Manual Pages" 1871: 1846: 1825: 1803: 1792: 1733: 1708: 1679: 1598: 1571: 1543: 1518: 1507: 1408:. July 23, 2014. Archived from 1325:. February 1996. Archived from 1238:Server Base System Architecture 1026:original equipment manufacturer 563: 291: 238:") provided through the system 3762:Deterministic finite automaton 2576:(UEFI and ACPI specifications) 1463:Bernhard Kauer (August 2009). 1456: 1369: 1344: 1307: 1275: 1009:, voltage and frequency scaled 999:, voltage and frequency scaled 989:, voltage and frequency scaled 944:P-states have become known as 1: 4553:Simultaneous and heterogenous 3340:Preboot Execution Environment 2945:Run-Time Abstraction Services 2478:Born's Tech and Windows World 1268: 1218:Active State Power Management 1013: 5237:Integrated memory controller 5219:Translation lookaside buffer 4418:Memory dependence prediction 3861:Random-access stored program 3814:Probabilistic Turing machine 2799:MultiProcessor Specification 1111: 193:MultiProcessor Specification 114:MultiProcessor Specification 7: 5658:Computer hardware standards 4693:Synaptic updates per second 3370:Remote Initial Program Load 2967:Common Firmware Environment 2434:"Getting Started With ACPI" 1211: 1147:conditions to do so are met 1046: 1018: 979:maximum power and frequency 802:(has auxiliary power), and 334:ACPI Component Architecture 10: 5691: 5097:Heterogeneous architecture 4019:Orthogonal instruction set 3789:Alternating Turing machine 3777:Quantum cellular automaton 2959:Hybrid firmware bootloader 2700: 1774:. Que Publishing. p.  908:platform has states up to 359: 234:using instruction lists (" 20: 5587:Microprocessor chronology 5574: 5550:Dynamic frequency scaling 5523: 5459: 5397: 5351: 5303: 5258: 5178: 5105: 5074: 4979: 4900: 4864: 4818: 4718: 4705:Cache performance metrics 4644: 4578: 4528: 4439: 4430: 4403: 4358: 4325: 4297: 4288: 4108: 4011: 4000: 3871: 3727: 3662: 3641: 3603: 3596: 3568:Dynamic frequency scaling 3560: 3539: 3425: 3386: 3329: 3293: 3245: 3238: 3204: 3172: 3008:Comparison of bootloaders 2990: 2958: 2843: 2753: 2721: 2711: 2652: 1092: 912:, where it distinguishes 611: 608: 383:stated in an e-mail that 189:Advanced Power Management 138: 127: 109:Advanced Power Management 101: 91: 67: 57: 49: 41: 33: 5602:Hardware security module 4945:Digital signal processor 4922:Graphics processing unit 4734:Graphics processing unit 2126:windows-driver-content. 1315:"APM BIOS Specification" 931:power-performance states 841:are defined as follows: 776:As with S0ix, Intel has 773:is the operating state. 719:system is powered down. 652:Commonly referred to as 5555:Dynamic voltage scaling 5338:Memory address register 5232:Branch target predictor 5196:Address generation unit 4939:Physics processing unit 4728:Central processing unit 4687:Transactions per second 4675:Instructions per second 4598:Array processing (SIMT) 3742:Stored-program computer 3573:Dynamic voltage scaling 2896:Phoenix SecureCore UEFI 2590:April 12, 2023, at the 1960:"ACPI in Windows Vista" 1442:UEFI.org/specifications 848:is the operating state. 630:Power on Suspend (POS): 529:state was implemented. 232:operating system kernel 207:) system. ACPI defines 175:components, to perform 5361:Hardwired control unit 5243:Memory management unit 5208:Memory management unit 4957:Secure cryptoprocessor 4951:Tensor Processing Unit 4933:Vision processing unit 4667:Cycles per instruction 4661:Instructions per cycle 4608:Associative processing 4299:Instruction pipelining 3721:Processor technologies 2362:Ottawa Linux Symposium 2076:: CS1 maint: others ( 762:are device dependent: 457: 449: 440: 5673:System administration 5444:Sum-addressed decoder 5190:Arithmetic logic unit 4317:Classic RISC pipeline 4271:Epiphany architecture 4118:Motorola 68000 series 1992:Microsoft Corporation 1967:Microsoft Corporation 1935:. Intel Corporation. 1667:on September 14, 2012 1323:Microsoft Corporation 1233:Power management keys 1055:and system firmware ( 833:The CPU power states 806:(no power provided): 555:OSPM responsibilities 493:(since OpenBSD 3.8), 485:(since FreeBSD 5.0), 455: 446: 438: 404:ambient light sensors 306:ACPI Machine Language 252:ACPI Machine Language 23:ACPI (disambiguation) 5565:Performance per watt 5143:replacement policies 4809:Package on a package 4699:Performance per watt 4603:Pipelined processing 4373:Tomasulo's algorithm 4178:Clipper architecture 4034:Application-specific 3747:Finite-state machine 3215:EFI system partition 3181:GUID Partition Table 3131:Windows Boot Manager 3001:Bootloader unlocking 2813:Legacy Plug and Play 2737:Open-source firmware 2730:Proprietary firmware 2341:on December 25, 2012 2294:on November 28, 2015 1821:on October 13, 1999. 1649:(December 6, 2011). 1643:Phoenix Technologies 1619:on February 2, 2007. 1559:(in Austrian German) 1259:(October 31, 2023). 941:no greater than 16. 664:Suspend to RAM (STR) 489:(since NetBSD 1.6), 223:components, and the 209:hardware abstraction 5597:Digital electronics 5250:Instruction decoder 5202:Floating-point unit 4856:Soft microprocessor 4803:System in a package 4378:Reservation station 3908:Transport-triggered 3222:BIOS boot partition 3195:Apple Partition Map 3026:Acronis OS Selector 2866:American Megatrends 2585:Sample EFI ASL code 2480:. December 6, 2017. 2396:on October 20, 2020 2045:Linux in a nutshell 1747:on February 3, 2014 1356:SearchWindowsServer 1332:on February 6, 2012 1134:of this section is 964:processors, and as 693:non-volatile memory 687:All content of the 644:is flushed to RAM. 577: 546:Windows Server 2003 527:S0ix/Modern Standby 30: 5469:Integrated circuit 5313:Processor register 4967:Baseband processor 4312:Operand forwarding 3772:Cellular automaton 3483:Power-on self-test 3188:Master boot record 2327:(September 2006). 2194:software.intel.com 2157:software.intel.com 2132:docs.microsoft.com 2031:msdn.microsoft.com 1833:"ArcaOS Changelog" 754:The device states 576: 458: 450: 441: 317:low-level language 197:Plug and Play BIOS 119:Plug and Play BIOS 28: 5630: 5629: 5519: 5518: 5138:Instruction cache 5128:Scratchpad memory 4975: 4974: 4962:Network processor 4891:Network on a chip 4846:Ultra-low-voltage 4797:Multi-chip module 4640: 4639: 4426: 4425: 4413:Branch prediction 4390:Register renaming 4284: 4283: 4266:VISC architecture 4088:Quantum computing 4083:VISC architecture 3965:Secondary storage 3881:Microarchitecture 3841:Register machines 3687: 3686: 3683: 3682: 3649:Intel Turbo Boost 3628:Transmeta LongRun 3499: 3498: 3325: 3324: 3173:Partition layouts 3168: 3167: 3152:Plop Boot Manager 2954: 2953: 2325:Intel Corporation 2055:978-0-596-52949-9 1958:Marshall, Allen. 1785:978-0-7897-2125-9 1635:Intel Corporation 1607:"ACPI extensions" 1319:Intel Corporation 1182:Mark Shuttleworth 1175: 1174: 1167: 925:Performance state 898:Additional states 740: 739: 640:CPU powered off. 431:Operating systems 225:operating systems 221:computer hardware 173:computer hardware 169:operating systems 154: 153: 92:Related standards 5680: 5592:Processor design 5484:Power management 5366:Instruction unit 5227:Branch predictor 5176: 5175: 4874:System on a chip 4816: 4815: 4656:Transistor count 4580:Flynn's taxonomy 4437: 4436: 4295: 4294: 4098:Addressing modes 4009: 4008: 3955:Memory hierarchy 3819:Hypercomputation 3737:Abstract machine 3714: 3707: 3700: 3691: 3690: 3611:AMD Cool'n'Quiet 3601: 3600: 3526: 3519: 3512: 3503: 3502: 3492: 3485: 3478: 3471: 3464: 3457: 3455:Execute in place 3450: 3443: 3436: 3418: 3411: 3404: 3397: 3379: 3372: 3365: 3356: 3349: 3342: 3318: 3311: 3304: 3284: 3277: 3270: 3263: 3256: 3243: 3242: 3231: 3224: 3217: 3197: 3190: 3183: 3161: 3154: 3147: 3140: 3133: 3126: 3119: 3112: 3105: 3098: 3091: 3084: 3077: 3070: 3063: 3056: 3049: 3042: 3035: 3028: 3015: 3014: 3010: 3003: 2983: 2976: 2969: 2947: 2940: 2933: 2926: 2919: 2912: 2905: 2903:TianoCore EDK II 2898: 2891: 2882: 2875: 2868: 2861: 2854: 2836: 2829: 2822: 2815: 2808: 2801: 2794: 2787: 2778: 2771: 2764: 2746: 2739: 2732: 2719: 2718: 2706: 2693: 2686: 2677: 2670: 2663: 2635: 2628: 2621: 2612: 2611: 2575: 2574: 2572:Official website 2557: 2556: 2554: 2552: 2540: 2534: 2531: 2522: 2516: 2510: 2509: 2507: 2505: 2488: 2482: 2481: 2470: 2464: 2463: 2451: 2442: 2441: 2430: 2424: 2423: 2412: 2406: 2405: 2403: 2401: 2392:. Archived from 2382: 2376: 2375: 2373: 2357: 2351: 2350: 2348: 2346: 2340: 2334:. Archived from 2333: 2321: 2315: 2313:Link aggregation 2310: 2304: 2303: 2301: 2299: 2293: 2282: 2274: 2268: 2267: 2265: 2263: 2248: 2242: 2241: 2229: 2223: 2222: 2220: 2218: 2204: 2198: 2197: 2196:. March 9, 2020. 2186: 2180: 2179: 2167: 2161: 2160: 2159:. March 9, 2020. 2149: 2143: 2142: 2140: 2138: 2128:"Modern Standby" 2123: 2117: 2116: 2114: 2112: 2097: 2091: 2088: 2082: 2081: 2075: 2067: 2040: 2034: 2024: 2018: 2013: 2004: 2003: 2001: 1999: 1984: 1978: 1977: 1975: 1973: 1964: 1955: 1949: 1948: 1946: 1944: 1934: 1925: 1919: 1918: 1916: 1914: 1900: 1894: 1893: 1891: 1889: 1875: 1869: 1868: 1866: 1864: 1850: 1844: 1843: 1841: 1839: 1829: 1823: 1822: 1817:. Archived from 1807: 1801: 1796: 1790: 1789: 1773: 1763: 1757: 1756: 1754: 1752: 1737: 1731: 1730: 1728: 1726: 1720: 1712: 1706: 1705: 1703: 1701: 1691: 1683: 1677: 1676: 1674: 1672: 1666: 1660:. Archived from 1655: 1627: 1621: 1620: 1618: 1612:. Archived from 1611: 1602: 1596: 1595: 1593: 1591: 1575: 1569: 1568: 1566: 1564: 1547: 1541: 1540: 1538: 1536: 1522: 1516: 1511: 1505: 1499: 1493: 1488: 1479: 1478: 1476: 1474: 1469: 1460: 1454: 1453: 1451: 1449: 1439: 1431: 1422: 1421: 1419: 1417: 1412:on June 22, 2011 1398: 1392: 1391: 1389: 1387: 1373: 1367: 1366: 1364: 1362: 1348: 1342: 1341: 1339: 1337: 1331: 1311: 1305: 1304: 1303:on May 25, 2019. 1302: 1292:. Archived from 1287: 1279: 1264: 1257:Garrett, Matthew 1170: 1163: 1159: 1156: 1150: 1124: 1123: 1116: 1053:operating system 886:(often known as 876:(often known as 854:(often known as 829:Processor states 685:Suspend to Disk: 578: 575: 422:ARM architecture 177:power management 150: 147: 145: 132:Power management 31: 27: 21:For others, see 5690: 5689: 5683: 5682: 5681: 5679: 5678: 5677: 5633: 5632: 5631: 5626: 5612:Tick–tock model 5570: 5526: 5515: 5455: 5439:Address decoder 5393: 5347: 5343:Program counter 5318:Status register 5299: 5254: 5214:Load–store unit 5181: 5174: 5101: 5070: 4971: 4928:Image processor 4903: 4896: 4866: 4860: 4836:Microcontroller 4826:Embedded system 4814: 4714: 4647: 4636: 4574: 4524: 4422: 4399: 4383:Re-order buffer 4354: 4335:Data dependency 4321: 4280: 4110: 4104: 4003: 4002:Instruction set 3996: 3982:Multiprocessing 3950:Cache hierarchy 3943:Register/memory 3867: 3767:Queue automaton 3723: 3718: 3688: 3679: 3658: 3637: 3623:Intel SpeedStep 3597:Implementations 3592: 3556: 3535: 3530: 3500: 3495: 3488: 3481: 3474: 3467: 3460: 3453: 3446: 3439: 3432: 3421: 3414: 3407: 3400: 3393: 3382: 3375: 3368: 3361: 3352: 3345: 3338: 3321: 3314: 3307: 3300: 3289: 3280: 3273: 3266: 3259: 3252: 3234: 3227: 3220: 3213: 3200: 3193: 3186: 3179: 3164: 3157: 3150: 3143: 3136: 3129: 3122: 3115: 3108: 3101: 3094: 3087: 3080: 3073: 3066: 3059: 3052: 3045: 3038: 3031: 3024: 3018:Implementations 3013: 3006: 2999: 2986: 2979: 2972: 2965: 2950: 2943: 2936: 2929: 2922: 2915: 2908: 2901: 2894: 2887: 2878: 2871: 2864: 2857: 2850: 2844:Implementations 2839: 2832: 2825: 2818: 2811: 2804: 2797: 2790: 2783: 2774: 2767: 2760: 2749: 2744:Custom firmware 2742: 2735: 2728: 2707: 2698: 2689: 2682: 2673: 2666: 2659: 2648: 2639: 2592:Wayback Machine 2570: 2569: 2566: 2561: 2560: 2550: 2548: 2547:. Linux Journal 2541: 2537: 2532: 2525: 2517: 2513: 2503: 2501: 2489: 2485: 2472: 2471: 2467: 2452: 2445: 2432: 2431: 2427: 2414: 2413: 2409: 2399: 2397: 2384: 2383: 2379: 2371:10.1.1.173.2206 2358: 2354: 2344: 2342: 2338: 2331: 2322: 2318: 2311: 2307: 2297: 2295: 2291: 2280: 2276: 2275: 2271: 2261: 2259: 2250: 2249: 2245: 2238:The Tech Report 2230: 2226: 2216: 2214: 2206: 2205: 2201: 2188: 2187: 2183: 2168: 2164: 2151: 2150: 2146: 2136: 2134: 2124: 2120: 2110: 2108: 2098: 2094: 2089: 2085: 2069: 2068: 2056: 2042: 2041: 2037: 2025: 2021: 2014: 2007: 1997: 1995: 1994:. June 15, 2017 1986: 1985: 1981: 1971: 1969: 1962: 1956: 1952: 1942: 1940: 1932: 1926: 1922: 1912: 1910: 1908:man.openbsd.org 1902: 1901: 1897: 1887: 1885: 1877: 1876: 1872: 1862: 1860: 1858:www.freebsd.org 1852: 1851: 1847: 1837: 1835: 1831: 1830: 1826: 1809: 1808: 1804: 1797: 1793: 1786: 1764: 1760: 1750: 1748: 1739: 1738: 1734: 1724: 1722: 1718: 1714: 1713: 1709: 1699: 1697: 1696:. July 23, 2014 1689: 1685: 1684: 1680: 1670: 1668: 1664: 1653: 1631:Hewlett-Packard 1628: 1624: 1616: 1609: 1603: 1599: 1589: 1587: 1577: 1576: 1572: 1562: 1560: 1549: 1548: 1544: 1534: 1532: 1524: 1523: 1519: 1512: 1508: 1500: 1496: 1489: 1482: 1472: 1470: 1467: 1461: 1457: 1447: 1445: 1437: 1433: 1432: 1425: 1415: 1413: 1400: 1399: 1395: 1385: 1383: 1375: 1374: 1370: 1360: 1358: 1350: 1349: 1345: 1335: 1333: 1329: 1313: 1312: 1308: 1296: 1285: 1283:"ACPI Overview" 1281: 1280: 1276: 1271: 1252: 1250:Further reading 1228:Green computing 1214: 1204:—author of the 1171: 1160: 1154: 1151: 1140: 1125: 1121: 1114: 1095: 1049: 1021: 1016: 952:processors, as 927: 831: 752: 734:real-time clock 727:Mechanical Off 571: 566: 557: 433: 362: 330: 314:domain-specific 310:Turing-complete 294: 256:virtual machine 142: 123: 87: 62: 50:First published 26: 17: 12: 11: 5: 5688: 5687: 5676: 5675: 5670: 5668:Electric power 5665: 5663:Open standards 5660: 5655: 5650: 5645: 5628: 5627: 5625: 5624: 5619: 5617:Pin grid array 5614: 5609: 5604: 5599: 5594: 5589: 5584: 5578: 5576: 5572: 5571: 5569: 5568: 5562: 5557: 5552: 5547: 5542: 5537: 5531: 5529: 5521: 5520: 5517: 5516: 5514: 5513: 5508: 5503: 5498: 5493: 5488: 5487: 5486: 5481: 5476: 5465: 5463: 5457: 5456: 5454: 5453: 5451:Barrel shifter 5448: 5447: 5446: 5441: 5434:Binary decoder 5431: 5430: 5429: 5419: 5414: 5409: 5403: 5401: 5395: 5394: 5392: 5391: 5386: 5378: 5373: 5368: 5363: 5357: 5355: 5349: 5348: 5346: 5345: 5340: 5335: 5330: 5325: 5323:Stack register 5320: 5315: 5309: 5307: 5301: 5300: 5298: 5297: 5296: 5295: 5290: 5280: 5275: 5270: 5264: 5262: 5256: 5255: 5253: 5252: 5247: 5246: 5245: 5234: 5229: 5224: 5223: 5222: 5216: 5205: 5199: 5193: 5186: 5184: 5173: 5172: 5167: 5162: 5157: 5152: 5151: 5150: 5145: 5140: 5135: 5130: 5125: 5115: 5109: 5107: 5103: 5102: 5100: 5099: 5094: 5089: 5084: 5078: 5076: 5072: 5071: 5069: 5068: 5067: 5066: 5056: 5051: 5046: 5041: 5036: 5031: 5026: 5021: 5016: 5011: 5006: 5001: 4996: 4991: 4985: 4983: 4977: 4976: 4973: 4972: 4970: 4969: 4964: 4959: 4954: 4948: 4942: 4936: 4930: 4925: 4919: 4917:AI accelerator 4914: 4908: 4906: 4898: 4897: 4895: 4894: 4888: 4883: 4880:Multiprocessor 4877: 4870: 4868: 4862: 4861: 4859: 4858: 4853: 4848: 4843: 4838: 4833: 4831:Microprocessor 4828: 4822: 4820: 4819:By application 4813: 4812: 4806: 4800: 4794: 4789: 4784: 4779: 4774: 4769: 4764: 4762:Tile processor 4759: 4754: 4749: 4744: 4743: 4742: 4731: 4724: 4722: 4716: 4715: 4713: 4712: 4707: 4702: 4696: 4690: 4684: 4678: 4672: 4671: 4670: 4658: 4652: 4650: 4642: 4641: 4638: 4637: 4635: 4634: 4633: 4632: 4622: 4617: 4616: 4615: 4610: 4605: 4600: 4590: 4584: 4582: 4576: 4575: 4573: 4572: 4567: 4562: 4557: 4556: 4555: 4550: 4548:Hyperthreading 4540: 4534: 4532: 4530:Multithreading 4526: 4525: 4523: 4522: 4517: 4512: 4511: 4510: 4500: 4499: 4498: 4493: 4483: 4482: 4481: 4476: 4466: 4461: 4460: 4459: 4454: 4443: 4441: 4434: 4428: 4427: 4424: 4423: 4421: 4420: 4415: 4409: 4407: 4401: 4400: 4398: 4397: 4392: 4387: 4386: 4385: 4380: 4370: 4364: 4362: 4356: 4355: 4353: 4352: 4347: 4342: 4337: 4331: 4329: 4323: 4322: 4320: 4319: 4314: 4309: 4307:Pipeline stall 4303: 4301: 4292: 4286: 4285: 4282: 4281: 4279: 4278: 4273: 4268: 4263: 4260: 4259: 4258: 4256:z/Architecture 4253: 4248: 4243: 4235: 4230: 4225: 4220: 4215: 4210: 4205: 4200: 4195: 4190: 4185: 4180: 4175: 4174: 4173: 4168: 4163: 4155: 4150: 4145: 4140: 4135: 4130: 4125: 4120: 4114: 4112: 4106: 4105: 4103: 4102: 4101: 4100: 4090: 4085: 4080: 4075: 4070: 4065: 4060: 4059: 4058: 4048: 4047: 4046: 4036: 4031: 4026: 4021: 4015: 4013: 4006: 3998: 3997: 3995: 3994: 3989: 3984: 3979: 3974: 3969: 3968: 3967: 3962: 3960:Virtual memory 3952: 3947: 3946: 3945: 3940: 3935: 3930: 3920: 3915: 3910: 3905: 3900: 3899: 3898: 3888: 3883: 3877: 3875: 3869: 3868: 3866: 3865: 3864: 3863: 3858: 3853: 3848: 3838: 3833: 3828: 3827: 3826: 3821: 3816: 3811: 3806: 3801: 3796: 3791: 3784:Turing machine 3781: 3780: 3779: 3774: 3769: 3764: 3759: 3754: 3744: 3739: 3733: 3731: 3725: 3724: 3717: 3716: 3709: 3702: 3694: 3685: 3684: 3681: 3680: 3678: 3677: 3672: 3666: 3664: 3660: 3659: 3657: 3656: 3654:AMD Turbo Core 3651: 3645: 3643: 3639: 3638: 3636: 3635: 3630: 3625: 3620: 3614: 3607: 3605: 3598: 3594: 3593: 3591: 3590: 3585: 3580: 3575: 3570: 3564: 3562: 3558: 3557: 3555: 3554: 3549: 3543: 3541: 3537: 3536: 3529: 3528: 3521: 3514: 3506: 3497: 3496: 3494: 3493: 3486: 3479: 3472: 3465: 3458: 3451: 3444: 3437: 3429: 3427: 3423: 3422: 3420: 3419: 3412: 3405: 3398: 3390: 3388: 3384: 3383: 3381: 3380: 3373: 3366: 3359: 3358: 3357: 3350: 3335: 3333: 3327: 3326: 3323: 3322: 3320: 3319: 3312: 3305: 3297: 3295: 3291: 3290: 3288: 3287: 3286: 3285: 3271: 3264: 3257: 3249: 3247: 3240: 3236: 3235: 3233: 3232: 3225: 3218: 3210: 3208: 3202: 3201: 3199: 3198: 3191: 3184: 3176: 3174: 3170: 3169: 3166: 3165: 3163: 3162: 3155: 3148: 3141: 3134: 3127: 3120: 3113: 3106: 3099: 3092: 3085: 3078: 3071: 3064: 3057: 3050: 3043: 3036: 3029: 3021: 3019: 3012: 3011: 3004: 2996: 2994: 2988: 2987: 2985: 2984: 2977: 2970: 2962: 2960: 2956: 2955: 2952: 2951: 2949: 2948: 2941: 2934: 2927: 2920: 2913: 2906: 2899: 2892: 2885: 2884: 2883: 2876: 2862: 2855: 2847: 2845: 2841: 2840: 2838: 2837: 2830: 2823: 2816: 2809: 2802: 2795: 2788: 2781: 2780: 2779: 2765: 2757: 2755: 2751: 2750: 2748: 2747: 2740: 2733: 2725: 2723: 2716: 2709: 2708: 2701: 2699: 2697: 2696: 2695: 2694: 2680: 2679: 2678: 2671: 2656: 2654: 2650: 2649: 2638: 2637: 2630: 2623: 2615: 2609: 2608: 2603: 2582: 2577: 2565: 2564:External links 2562: 2559: 2558: 2535: 2523: 2511: 2483: 2465: 2443: 2425: 2407: 2390:www.kernel.org 2377: 2352: 2316: 2305: 2269: 2258:. June 9, 2013 2243: 2224: 2199: 2181: 2162: 2144: 2118: 2092: 2083: 2054: 2035: 2019: 2005: 1979: 1950: 1920: 1895: 1883:man.netbsd.org 1870: 1845: 1824: 1802: 1791: 1784: 1758: 1732: 1707: 1678: 1622: 1597: 1570: 1542: 1517: 1506: 1494: 1480: 1455: 1423: 1393: 1381:www.kernel.org 1368: 1343: 1306: 1273: 1272: 1270: 1267: 1266: 1265: 1251: 1248: 1247: 1246: 1241: 1235: 1230: 1225: 1220: 1213: 1210: 1202:Linus Torvalds 1173: 1172: 1128: 1126: 1119: 1113: 1110: 1109: 1108: 1105: 1102: 1099: 1094: 1091: 1048: 1045: 1020: 1017: 1015: 1012: 1011: 1010: 1000: 990: 980: 926: 923: 922: 921: 895: 892:cache coherent 881: 871: 849: 830: 827: 826: 825: 824: 823: 813: 793: 783: 782: 781: 751: 748: 738: 737: 730: 728: 725: 721: 720: 711: 708: 705: 701: 700: 676: 672: 671: 650: 646: 645: 638: 634: 633: 627: 623: 622: 619:Modern Standby 616: 613: 610: 606: 605: 602: 599: 596: 592: 591: 588: 585: 582: 570: 567: 565: 562: 556: 553: 432: 429: 400:multiprocessor 375:In 1999, then 361: 358: 329: 326: 293: 290: 152: 151: 140: 136: 135: 129: 125: 124: 122: 121: 116: 111: 105: 103: 99: 98: 93: 89: 88: 86: 85: 84:(2013-current) 79: 71: 69: 65: 64: 59: 58:Latest version 55: 54: 51: 47: 46: 43: 39: 38: 35: 15: 9: 6: 4: 3: 2: 5686: 5685: 5674: 5671: 5669: 5666: 5664: 5661: 5659: 5656: 5654: 5651: 5649: 5646: 5644: 5641: 5640: 5638: 5623: 5620: 5618: 5615: 5613: 5610: 5608: 5605: 5603: 5600: 5598: 5595: 5593: 5590: 5588: 5585: 5583: 5580: 5579: 5577: 5573: 5566: 5563: 5561: 5558: 5556: 5553: 5551: 5548: 5546: 5543: 5541: 5538: 5536: 5533: 5532: 5530: 5528: 5522: 5512: 5509: 5507: 5504: 5502: 5499: 5497: 5494: 5492: 5489: 5485: 5482: 5480: 5477: 5475: 5472: 5471: 5470: 5467: 5466: 5464: 5462: 5458: 5452: 5449: 5445: 5442: 5440: 5437: 5436: 5435: 5432: 5428: 5425: 5424: 5423: 5420: 5418: 5415: 5413: 5412:Demultiplexer 5410: 5408: 5405: 5404: 5402: 5400: 5396: 5390: 5387: 5385: 5382: 5379: 5377: 5374: 5372: 5369: 5367: 5364: 5362: 5359: 5358: 5356: 5354: 5350: 5344: 5341: 5339: 5336: 5334: 5333:Memory buffer 5331: 5329: 5328:Register file 5326: 5324: 5321: 5319: 5316: 5314: 5311: 5310: 5308: 5306: 5302: 5294: 5291: 5289: 5286: 5285: 5284: 5281: 5279: 5276: 5274: 5271: 5269: 5268:Combinational 5266: 5265: 5263: 5261: 5257: 5251: 5248: 5244: 5241: 5240: 5238: 5235: 5233: 5230: 5228: 5225: 5220: 5217: 5215: 5212: 5211: 5209: 5206: 5203: 5200: 5197: 5194: 5191: 5188: 5187: 5185: 5183: 5177: 5171: 5168: 5166: 5163: 5161: 5158: 5156: 5153: 5149: 5146: 5144: 5141: 5139: 5136: 5134: 5131: 5129: 5126: 5124: 5121: 5120: 5119: 5116: 5114: 5111: 5110: 5108: 5104: 5098: 5095: 5093: 5090: 5088: 5085: 5083: 5080: 5079: 5077: 5073: 5065: 5062: 5061: 5060: 5057: 5055: 5052: 5050: 5047: 5045: 5042: 5040: 5037: 5035: 5032: 5030: 5027: 5025: 5022: 5020: 5017: 5015: 5012: 5010: 5007: 5005: 5002: 5000: 4997: 4995: 4992: 4990: 4987: 4986: 4984: 4982: 4978: 4968: 4965: 4963: 4960: 4958: 4955: 4952: 4949: 4946: 4943: 4940: 4937: 4934: 4931: 4929: 4926: 4923: 4920: 4918: 4915: 4913: 4910: 4909: 4907: 4905: 4899: 4892: 4889: 4887: 4884: 4881: 4878: 4875: 4872: 4871: 4869: 4863: 4857: 4854: 4852: 4849: 4847: 4844: 4842: 4839: 4837: 4834: 4832: 4829: 4827: 4824: 4823: 4821: 4817: 4810: 4807: 4804: 4801: 4798: 4795: 4793: 4790: 4788: 4785: 4783: 4780: 4778: 4775: 4773: 4770: 4768: 4765: 4763: 4760: 4758: 4755: 4753: 4750: 4748: 4745: 4741: 4738: 4737: 4735: 4732: 4729: 4726: 4725: 4723: 4721: 4717: 4711: 4708: 4706: 4703: 4700: 4697: 4694: 4691: 4688: 4685: 4682: 4679: 4676: 4673: 4668: 4665: 4664: 4662: 4659: 4657: 4654: 4653: 4651: 4649: 4643: 4631: 4628: 4627: 4626: 4623: 4621: 4618: 4614: 4611: 4609: 4606: 4604: 4601: 4599: 4596: 4595: 4594: 4591: 4589: 4586: 4585: 4583: 4581: 4577: 4571: 4568: 4566: 4563: 4561: 4558: 4554: 4551: 4549: 4546: 4545: 4544: 4541: 4539: 4536: 4535: 4533: 4531: 4527: 4521: 4518: 4516: 4513: 4509: 4506: 4505: 4504: 4501: 4497: 4494: 4492: 4489: 4488: 4487: 4484: 4480: 4477: 4475: 4472: 4471: 4470: 4467: 4465: 4462: 4458: 4455: 4453: 4450: 4449: 4448: 4445: 4444: 4442: 4438: 4435: 4433: 4429: 4419: 4416: 4414: 4411: 4410: 4408: 4406: 4402: 4396: 4393: 4391: 4388: 4384: 4381: 4379: 4376: 4375: 4374: 4371: 4369: 4368:Scoreboarding 4366: 4365: 4363: 4361: 4357: 4351: 4350:False sharing 4348: 4346: 4343: 4341: 4338: 4336: 4333: 4332: 4330: 4328: 4324: 4318: 4315: 4313: 4310: 4308: 4305: 4304: 4302: 4300: 4296: 4293: 4291: 4287: 4277: 4274: 4272: 4269: 4267: 4264: 4261: 4257: 4254: 4252: 4249: 4247: 4244: 4242: 4239: 4238: 4236: 4234: 4231: 4229: 4226: 4224: 4221: 4219: 4216: 4214: 4211: 4209: 4206: 4204: 4201: 4199: 4196: 4194: 4191: 4189: 4186: 4184: 4181: 4179: 4176: 4172: 4169: 4167: 4164: 4162: 4159: 4158: 4156: 4154: 4151: 4149: 4146: 4144: 4143:Stanford MIPS 4141: 4139: 4136: 4134: 4131: 4129: 4126: 4124: 4121: 4119: 4116: 4115: 4113: 4107: 4099: 4096: 4095: 4094: 4091: 4089: 4086: 4084: 4081: 4079: 4076: 4074: 4071: 4069: 4066: 4064: 4061: 4057: 4054: 4053: 4052: 4049: 4045: 4042: 4041: 4040: 4037: 4035: 4032: 4030: 4027: 4025: 4022: 4020: 4017: 4016: 4014: 4010: 4007: 4005: 4004:architectures 3999: 3993: 3990: 3988: 3985: 3983: 3980: 3978: 3975: 3973: 3972:Heterogeneous 3970: 3966: 3963: 3961: 3958: 3957: 3956: 3953: 3951: 3948: 3944: 3941: 3939: 3936: 3934: 3931: 3929: 3926: 3925: 3924: 3923:Memory access 3921: 3919: 3916: 3914: 3911: 3909: 3906: 3904: 3901: 3897: 3894: 3893: 3892: 3889: 3887: 3884: 3882: 3879: 3878: 3876: 3874: 3870: 3862: 3859: 3857: 3856:Random-access 3854: 3852: 3849: 3847: 3844: 3843: 3842: 3839: 3837: 3836:Stack machine 3834: 3832: 3829: 3825: 3822: 3820: 3817: 3815: 3812: 3810: 3807: 3805: 3802: 3800: 3797: 3795: 3792: 3790: 3787: 3786: 3785: 3782: 3778: 3775: 3773: 3770: 3768: 3765: 3763: 3760: 3758: 3755: 3753: 3752:with datapath 3750: 3749: 3748: 3745: 3743: 3740: 3738: 3735: 3734: 3732: 3730: 3726: 3722: 3715: 3710: 3708: 3703: 3701: 3696: 3695: 3692: 3676: 3675:AMD PowerTune 3673: 3671: 3670:AMD PowerPlay 3668: 3667: 3665: 3661: 3655: 3652: 3650: 3647: 3646: 3644: 3640: 3634: 3631: 3629: 3626: 3624: 3621: 3618: 3617:AMD PowerNow! 3615: 3612: 3609: 3608: 3606: 3602: 3599: 3595: 3589: 3588:Underclocking 3586: 3584: 3581: 3579: 3576: 3574: 3571: 3569: 3566: 3565: 3563: 3559: 3553: 3550: 3548: 3545: 3544: 3542: 3538: 3534: 3527: 3522: 3520: 3515: 3513: 3508: 3507: 3504: 3491: 3487: 3484: 3480: 3477: 3473: 3470: 3466: 3463: 3459: 3456: 3452: 3449: 3445: 3442: 3438: 3435: 3431: 3430: 3428: 3424: 3417: 3413: 3410: 3406: 3403: 3399: 3396: 3392: 3391: 3389: 3385: 3378: 3374: 3371: 3367: 3364: 3360: 3355: 3351: 3348: 3344: 3343: 3341: 3337: 3336: 3334: 3332: 3328: 3317: 3313: 3310: 3306: 3303: 3299: 3298: 3296: 3292: 3283: 3279: 3278: 3276: 3272: 3269: 3265: 3262: 3258: 3255: 3251: 3250: 3248: 3244: 3241: 3237: 3230: 3226: 3223: 3219: 3216: 3212: 3211: 3209: 3207: 3203: 3196: 3192: 3189: 3185: 3182: 3178: 3177: 3175: 3171: 3160: 3156: 3153: 3149: 3146: 3142: 3139: 3135: 3132: 3128: 3125: 3121: 3118: 3114: 3111: 3107: 3104: 3100: 3097: 3093: 3090: 3086: 3083: 3079: 3076: 3072: 3069: 3065: 3062: 3058: 3055: 3054:BootX (Linux) 3051: 3048: 3047:BootX (Apple) 3044: 3041: 3037: 3034: 3030: 3027: 3023: 3022: 3020: 3016: 3009: 3005: 3002: 2998: 2997: 2995: 2993: 2989: 2982: 2978: 2975: 2971: 2968: 2964: 2963: 2961: 2957: 2946: 2942: 2939: 2935: 2932: 2928: 2925: 2921: 2918: 2914: 2911: 2907: 2904: 2900: 2897: 2893: 2890: 2886: 2881: 2877: 2874: 2870: 2869: 2867: 2863: 2860: 2856: 2853: 2849: 2848: 2846: 2842: 2835: 2831: 2828: 2824: 2821: 2817: 2814: 2810: 2807: 2803: 2800: 2796: 2793: 2789: 2786: 2785:Open Firmware 2782: 2777: 2773: 2772: 2770: 2766: 2763: 2759: 2758: 2756: 2752: 2745: 2741: 2738: 2734: 2731: 2727: 2726: 2724: 2720: 2717: 2715: 2710: 2705: 2692: 2688: 2687: 2685: 2681: 2676: 2672: 2669: 2665: 2664: 2662: 2658: 2657: 2655: 2651: 2647: 2643: 2636: 2631: 2629: 2624: 2622: 2617: 2616: 2613: 2607: 2604: 2601: 2597: 2593: 2589: 2586: 2583: 2581: 2578: 2573: 2568: 2567: 2546: 2539: 2530: 2528: 2521: 2515: 2500: 2499: 2494: 2487: 2479: 2475: 2469: 2461: 2457: 2450: 2448: 2439: 2435: 2429: 2421: 2417: 2411: 2395: 2391: 2387: 2381: 2372: 2367: 2363: 2356: 2337: 2330: 2326: 2320: 2314: 2309: 2290: 2286: 2279: 2273: 2257: 2253: 2247: 2239: 2235: 2228: 2213: 2209: 2203: 2195: 2191: 2190:"D0ix States" 2185: 2177: 2173: 2166: 2158: 2154: 2153:"S0ix States" 2148: 2133: 2129: 2122: 2107: 2103: 2096: 2087: 2079: 2073: 2065: 2061: 2057: 2051: 2047: 2046: 2039: 2032: 2028: 2023: 2017: 2012: 2010: 1998:September 20, 1993: 1989: 1983: 1968: 1961: 1954: 1938: 1931: 1924: 1909: 1905: 1899: 1884: 1880: 1874: 1859: 1855: 1849: 1834: 1828: 1820: 1816: 1812: 1806: 1800: 1795: 1787: 1781: 1777: 1772: 1771: 1762: 1746: 1742: 1736: 1717: 1711: 1695: 1688: 1682: 1663: 1659: 1652: 1648: 1644: 1640: 1636: 1632: 1626: 1615: 1608: 1601: 1586: 1585: 1580: 1574: 1558: 1557: 1552: 1546: 1531: 1527: 1521: 1515: 1510: 1503: 1502:ACPI in Linux 1498: 1492: 1487: 1485: 1466: 1459: 1444:. August 2022 1443: 1436: 1430: 1428: 1411: 1407: 1403: 1397: 1386:September 18, 1382: 1378: 1372: 1361:September 18, 1357: 1353: 1347: 1328: 1324: 1320: 1316: 1310: 1300: 1295: 1291: 1290:www.acpi.info 1284: 1278: 1274: 1262: 1258: 1254: 1253: 1245: 1242: 1239: 1236: 1234: 1231: 1229: 1226: 1224: 1221: 1219: 1216: 1215: 1209: 1207: 1203: 1198: 1196: 1192: 1188: 1183: 1179: 1169: 1166: 1158: 1148: 1144: 1138: 1137: 1133: 1127: 1118: 1117: 1106: 1103: 1100: 1097: 1096: 1090: 1088: 1084: 1080: 1076: 1071: 1068: 1064: 1062: 1058: 1054: 1044: 1041: 1038: 1034: 1029: 1027: 1008: 1004: 1001: 998: 994: 991: 988: 984: 981: 978: 975: 974: 973: 971: 967: 963: 959: 955: 951: 947: 942: 940: 936: 932: 919: 915: 911: 907: 903: 899: 896: 893: 889: 885: 882: 879: 875: 872: 869: 865: 861: 857: 853: 850: 847: 844: 843: 842: 840: 836: 821: 817: 814: 811: 808: 807: 805: 801: 797: 794: 791: 787: 784: 779: 775: 774: 772: 768: 765: 764: 763: 761: 757: 750:Device states 747: 745: 735: 731: 729: 726: 723: 722: 718: 716: 712: 709: 706: 703: 702: 698: 694: 690: 686: 682: 681: 677: 674: 673: 669: 665: 661: 660: 655: 651: 648: 647: 643: 639: 636: 635: 631: 628: 625: 624: 620: 617: 614: 607: 603: 600: 597: 594: 593: 589: 586: 583: 580: 579: 574: 569:Global states 561: 552: 549: 547: 543: 539: 533: 530: 528: 524: 520: 519:Windows Vista 516: 512: 508: 504: 500: 496: 492: 488: 484: 480: 476: 472: 468: 463: 454: 445: 437: 428: 425: 423: 418: 416: 412: 407: 405: 401: 397: 393: 388: 386: 382: 378: 373: 371: 367: 357: 355: 351: 347: 343: 339: 335: 325: 322: 318: 315: 311: 307: 303: 299: 289: 287: 283: 279: 275: 271: 267: 263: 259: 257: 253: 249: 245: 241: 237: 233: 228: 226: 222: 218: 214: 210: 206: 202: 198: 194: 190: 186: 182: 181:Plug and Play 178: 174: 170: 166: 165:open standard 162: 158: 149: 141: 137: 133: 130: 126: 120: 117: 115: 112: 110: 107: 106: 104: 100: 97: 94: 90: 83: 80: 77: 73: 72: 70: 66: 60: 56: 53:December 1996 52: 48: 44: 40: 36: 32: 24: 19: 5622:Chip carrier 5560:Clock gating 5544: 5479:Mixed-signal 5376:Write buffer 5353:Control unit 5165:Clock signal 4904:accelerators 4886:Cypress PSoC 4543:Simultaneous 4360:Out-of-order 3992:Neuromorphic 3873:Architecture 3831:Belt machine 3824:Zeno machine 3757:Hierarchical 3633:VIA LongHaul 3604:Power Saving 3583:Overclocking 3578:Clock gating 3387:ROM variants 3331:Network boot 3309:Raspberry Pi 3075:systemd-boot 2791: 2549:. Retrieved 2538: 2514: 2504:November 10, 2502:. Retrieved 2496: 2486: 2477: 2468: 2459: 2437: 2428: 2419: 2410: 2398:. Retrieved 2394:the original 2389: 2380: 2361: 2355: 2343:. Retrieved 2336:the original 2319: 2308: 2296:. Retrieved 2289:the original 2284: 2272: 2260:. Retrieved 2246: 2240:. p. 2. 2227: 2215:. Retrieved 2202: 2193: 2184: 2175: 2165: 2156: 2147: 2135:. Retrieved 2131: 2121: 2109:. Retrieved 2095: 2086: 2044: 2038: 2030: 2022: 1996:. Retrieved 1982: 1970:. Retrieved 1953: 1941:. Retrieved 1923: 1911:. Retrieved 1907: 1898: 1886:. Retrieved 1882: 1873: 1861:. Retrieved 1857: 1848: 1836:. Retrieved 1827: 1819:the original 1814: 1805: 1794: 1769: 1761: 1749:. Retrieved 1745:the original 1735: 1723:. Retrieved 1710: 1698:. Retrieved 1693: 1681: 1671:November 17, 1669:. Retrieved 1662:the original 1657: 1625: 1614:the original 1600: 1588:. Retrieved 1582: 1573: 1561:. Retrieved 1556:Der Standard 1554: 1545: 1535:September 6, 1533:. Retrieved 1530:arcanoae.com 1529: 1520: 1509: 1497: 1473:February 18, 1471:. Retrieved 1458: 1446:. Retrieved 1441: 1414:. Retrieved 1410:the original 1405: 1396: 1384:. Retrieved 1380: 1371: 1359:. Retrieved 1355: 1346: 1334:. Retrieved 1327:the original 1309: 1294:the original 1289: 1277: 1206:Linux kernel 1199: 1176: 1161: 1152: 1130: 1072: 1069: 1065: 1050: 1042: 1030: 1022: 1006: 1002: 996: 992: 986: 982: 976: 972:processors. 958:Cool'n'Quiet 943: 938: 934: 928: 917: 913: 909: 897: 887: 883: 877: 873: 867: 855: 851: 845: 838: 834: 832: 819: 815: 809: 803: 799: 795: 789: 785: 777: 770: 766: 759: 755: 753: 743: 741: 713: 691:is saved to 684: 678: 663: 657: 653: 629: 590:Description 572: 564:Power states 558: 550: 538:Windows 2000 534: 531: 513:versions of 460:Microsoft's 459: 426: 419: 411:USB 3.0 408: 394:interfaces, 389: 374: 363: 337: 333: 331: 305: 295: 292:Architecture 260: 251: 229: 204: 200: 185:hot swapping 160: 156: 155: 68:Organization 34:Abbreviation 18: 5407:Multiplexer 5371:Data buffer 5082:Single-core 5054:bit slicing 4912:Coprocessor 4767:Coprocessor 4648:performance 4570:Cooperative 4560:Speculative 4520:Distributed 4479:Superscalar 4464:Instruction 4432:Parallelism 4405:Speculative 4237:System/3x0 4109:Instruction 3886:Von Neumann 3799:Post–Turing 3642:Performance 3441:ROM hacking 3377:Wake-on-LAN 3040:BootManager 2992:Bootloaders 2551:January 13, 2460:How-To Geek 2400:November 8, 2262:October 20, 2217:October 26, 2111:October 20, 1913:December 3, 1888:December 3, 1863:December 3, 1751:January 27, 1725:January 27, 1590:November 6, 1563:November 6, 1416:January 25, 1261:"Why ACPI?" 1244:Wake-on-LAN 1195:declarative 1191:open-source 916:states and 689:main memory 680:Hibernation 642:Dirty cache 475:eComStation 396:PCI Express 342:open-source 321:interpreter 298:main memory 191:(APM), the 102:Predecessor 78:(1996-2013) 63:August 2022 5637:Categories 5527:management 5422:Multiplier 5283:Logic gate 5273:Sequential 5180:Functional 5160:Clock rate 5133:Data cache 5106:Components 5087:Multi-core 5075:Core count 4565:Preemptive 4469:Pipelining 4452:Bit-serial 4395:Wide-issue 4340:Structural 4262:Tilera ISA 4228:MicroBlaze 4198:ETRAX CRIS 4093:Comparison 3938:Load–store 3918:Endianness 3561:Techniques 3476:Instant-on 3462:Devicetree 3302:Bus Pirate 3206:Partitions 2974:Das U-Boot 2859:Award BIOS 2776:Video BIOS 2754:Interfaces 2596:VirtualBox 2345:October 5, 2298:August 19, 1943:August 21, 1838:August 24, 1815:winmag.com 1448:October 4, 1299:slide show 1269:References 1155:March 2024 1132:neutrality 1014:Interfaces 1005:less than 995:less than 985:less than 966:PowerSaver 878:Stop-Clock 864:AMD Athlon 697:hard drive 695:such as a 542:Windows XP 462:Windows 98 381:Bill Gates 286:UEFI Forum 195:, and the 82:UEFI Forum 5461:Circuitry 5381:Microcode 5305:Registers 5148:coherence 5123:CPU cache 4981:Word size 4646:Processor 4290:Execution 4193:DEC Alpha 4171:Power ISA 3987:Cognitive 3794:Universal 3613:(desktop) 3540:Standards 3448:ROM image 3239:Utilities 3096:OpeniBoot 2938:Kickstart 2931:LinuxBoot 2924:Libreboot 2889:InsydeH2O 2880:AMI Aptio 2820:AlphaBIOS 2653:Processes 2600:TianoCore 2498:TechRadar 2366:CiteSeerX 2285:ACPI.info 2256:AnandTech 2212:AnandTech 2137:March 20, 2106:AnandTech 2072:cite book 2064:773210086 2027:ACPI BIOS 1658:acpi.info 1639:Microsoft 1143:talk page 1112:Criticism 1079:Superfish 954:PowerNow! 946:SpeedStep 860:Pentium 4 707:Soft Off 612:Sleeping 523:Windows 8 448:computer. 417:support. 377:Microsoft 308:(AML), a 266:Microsoft 45:Published 5399:Datapath 5092:Manycore 5064:variable 4902:Hardware 4538:Temporal 4218:OpenRISC 3913:Cellular 3903:Dataflow 3896:modified 3663:Graphics 3619:(laptop) 3490:EDL mode 3469:Fastboot 3434:Boot ROM 3294:Hardware 3282:Heimdall 3268:UEFITool 3254:flashrom 3246:Software 3124:SYSLINUX 3061:GNU GRUB 2917:Coreboot 2910:OpenBIOS 2714:firmware 2712:Booting 2642:Firmware 2594:used by 2588:Archived 2420:ArchWiki 1937:Archived 1694:uefi.org 1584:Golem.de 1406:acpi.org 1223:Coreboot 1212:See also 1180:founder 1136:disputed 1087:rootkits 1047:Firmware 1019:Hardware 771:Fully On 715:Shutdown 598:Working 507:GNU Hurd 302:bytecode 240:firmware 163:) is an 134:firmware 5575:Related 5506:Quantum 5496:Digital 5491:Boolean 5389:Counter 5288:Quantum 5049:512-bit 5044:256-bit 5039:128-bit 4882:(MPSoC) 4867:on chip 4865:Systems 4683:(FLOPS) 4496:Process 4345:Control 4327:Hazards 4213:Itanium 4208:Unicore 4166:PowerPC 3891:Harvard 3851:Pointer 3846:Counter 3804:Quantum 3426:Related 3363:NetBoot 3103:RedBoot 3082:loadlin 3033:Barebox 2873:AMIBIOS 2852:SeaBIOS 2691:Android 2661:Windows 2646:booting 2438:GitBook 1972:July 2, 1700:May 24, 1647:Toshiba 1336:July 2, 1301:in PDF) 1083:Samsung 1035:-based 1028:(OEM). 920:states. 918:package 906:Haswell 804:D3 Cold 654:Standby 515:Solaris 499:OpenVMS 491:OpenBSD 483:FreeBSD 467:Windows 360:History 354:FreeBSD 282:Phoenix 270:Toshiba 236:methods 219:), the 139:Website 5511:Switch 5501:Analog 5239:(IMC) 5210:(MMU) 5059:others 5034:64-bit 5029:48-bit 5024:32-bit 5019:24-bit 5014:16-bit 5009:15-bit 5004:12-bit 4841:Mobile 4757:Stream 4752:Barrel 4747:Vector 4736:(GPU) 4695:(SUPS) 4663:(IPC) 4515:Memory 4508:Vector 4491:Thread 4474:Scalar 4276:Others 4223:RISC-V 4188:SuperH 4157:Power 4153:MIPS-X 4128:PDP-11 3977:Fabric 3729:Models 3416:EEPROM 3316:ft2232 3229:/boot/ 3145:Yaboot 3110:rEFInd 2606:ACPICA 2416:"DSDT" 2368:  2176:01.org 2062:  2052:  1782:  1504:, 2005 1240:(SBSA) 1178:Ubuntu 1093:Tables 1075:Lenovo 1007:P(n–1) 800:D3 Hot 744:Legacy 544:, and 525:, the 487:NetBSD 479:ArcaOS 415:x2APIC 370:64-bit 366:32-bit 350:ArcaOS 338:ACPICA 278:Huawei 128:Domain 42:Status 5567:(PPW) 5525:Power 5417:Adder 5293:Array 5260:Logic 5221:(TLB) 5204:(FPU) 5198:(AGU) 5192:(ALU) 5182:units 5118:Cache 4999:8-bit 4994:4-bit 4989:1-bit 4953:(TPU) 4947:(DSP) 4941:(PPU) 4935:(VPU) 4924:(GPU) 4893:(NoC) 4876:(SoC) 4811:(PoP) 4805:(SiP) 4799:(MCM) 4740:GPGPU 4730:(CPU) 4720:Types 4701:(PPW) 4689:(TPS) 4677:(IPS) 4669:(CPI) 4440:Level 4251:S/390 4246:S/370 4241:S/360 4183:SPARC 4161:POWER 4044:TRIPS 4012:Types 3409:EPROM 3261:fwupd 3117:rEFIt 3089:NTLDR 3068:iBoot 2722:Types 2684:Linux 2364:: 3. 2339:(PDF) 2332:(PDF) 2292:(PDF) 2281:(PDF) 1963:(PPT) 1933:(PPT) 1719:(PDF) 1690:(PDF) 1665:(PDF) 1654:(PDF) 1617:(PDF) 1610:(PDF) 1468:(PDF) 1438:(PDF) 1330:(RTF) 1286:(PDF) 1033:Intel 950:Intel 902:Intel 888:Sleep 662:, or 659:Sleep 615:S0ix 584:Name 503:Linux 495:HP-UX 471:macOS 398:bus, 385:Linux 346:Haiku 262:Intel 167:that 148:/acpi 74:ACPI 5643:BIOS 5545:ACPI 5278:Glue 5170:FIFO 5113:Core 4851:ASIP 4792:CPLD 4787:FPOA 4782:FPGA 4777:ASIC 4630:SPMD 4625:MIMD 4620:MISD 4613:SWAR 4593:SIMD 4588:SISD 4503:Data 4486:Task 4457:Word 4203:M32R 4148:MIPS 4111:sets 4078:ZISC 4073:NISC 4068:OISC 4063:MISC 4056:EPIC 4051:VLIW 4039:EDGE 4029:RISC 4024:CISC 3933:HUMA 3928:NUMA 3402:PROM 3354:iPXE 3347:gPXE 3275:Odin 3159:MILO 3138:xOSL 2981:ARCS 2792:ACPI 2769:BIOS 2762:UEFI 2644:and 2553:2010 2506:2022 2402:2020 2347:2014 2300:2015 2264:2013 2219:2020 2139:2020 2113:2013 2078:link 2060:OCLC 2050:ISBN 2000:2019 1974:2010 1945:2011 1915:2020 1890:2020 1865:2020 1840:2020 1780:ISBN 1753:2014 1727:2014 1702:2015 1673:2013 1592:2022 1565:2022 1537:2020 1475:2019 1450:2022 1418:2016 1388:2020 1363:2020 1338:2010 1129:The 1104:SLIP 1098:PHAT 1061:UEFI 1057:BIOS 914:core 862:and 856:Halt 816:Cold 788:and 778:D0ix 509:and 392:SATA 379:CEO 352:and 332:The 280:and 268:and 248:BIOS 244:UEFI 217:UEFI 213:BIOS 205:OSPM 183:and 161:ACPI 146:.org 144:uefi 96:UEFI 37:ACPI 5540:APM 5535:PMU 5427:CPU 5384:ROM 5155:Bus 4772:PAL 4447:Bit 4233:LMC 4138:ARM 4133:x86 4123:VAX 3395:ROM 2834:SFI 2827:SRM 2806:APM 1187:NSA 1059:or 1037:PCs 970:VIA 968:in 962:AMD 960:in 956:or 948:in 910:C10 904:'s 868:C1E 820:Off 818:or 810:Hot 769:or 724:G3 710:S5 704:G2 683:or 675:S4 668:RAM 649:S3 637:S2 626:S1 609:G1 601:S0 595:G0 587:Sx 581:Gx 304:of 246:or 76:SIG 61:6.5 5639:: 5474:3D 2675:NT 2668:9x 2526:^ 2495:. 2476:. 2458:. 2446:^ 2436:. 2418:. 2388:. 2283:. 2254:. 2236:. 2210:. 2192:. 2174:. 2155:. 2130:. 2104:. 2074:}} 2070:{{ 2058:. 2029:. 2008:^ 1990:. 1965:. 1906:. 1881:. 1856:. 1813:. 1778:. 1776:30 1692:. 1656:. 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Index

ACPI (disambiguation)
SIG
UEFI Forum
UEFI
Advanced Power Management
MultiProcessor Specification
Plug and Play BIOS
Power management
uefi.org/acpi
open standard
operating systems
computer hardware
power management
Plug and Play
hot swapping
Advanced Power Management
MultiProcessor Specification
Plug and Play BIOS
hardware abstraction
BIOS
UEFI
computer hardware
operating systems
operating system kernel
methods
firmware
UEFI
BIOS
virtual machine
Intel

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