Advanced Configuration and Power Interface
In a computer, the Advanced Configuration and Power Interface provides an open standard that operating systems can use to discover and configure computer hardware components, to perform power management by putting unused components to sleep, and to perform status monitoring. First released in December 1996, ACPI aims to replace Advanced Power Management, the MultiProcessor Specification, and the Plug and Play BIOS Specification. ACPI brings the 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 Operating System-directed configuration and Power Management system, an implementation for ACPI which removes device management responsibilities from legacy firmware interfaces via a UI.
Internally, ACPI advertises the available components and their functions to the operating system kernel using instruction lists provided through the system firmware, which the kernel parses. ACPI then executes the desired operations written in ACPI Machine Language using an embedded minimal virtual machine.
Intel, Microsoft and Toshiba originally developed the standard, while HP, Huawei and Phoenix also participated later. In October 2013, ACPI Special Interest Group, the original developers of the ACPI standard, agreed to transfer all assets to the UEFI Forum, in which all future development will take place.
The UEFI Forum published of the standard, "Revision 6.3", in end of January 2019.
Architecture
The firmware-level ACPI has three main components: the ACPI tables, the ACPI BIOS, and the ACPI registers. Unlike its predecessors, such as the APM or PnP BIOS, the ACPI implements little of its functionality in the ACPI BIOS code, whose main role is to load the ACPI tables in system memory. Instead, most of the firmware ACPI functionality is provided in bytecode of ACPI Machine Language, a Turing-complete, domain-specific low-level language, stored in the ACPI tables. To make use of these tables, the operating system must have an interpreter for the AML bytecode. A reference AML interpreter implementation is provided by the ACPI Component Architecture. At the BIOS development time, AML bytecode is compiled from the ASL code.As ACPI also replaces PnP BIOS, it also provides a hardware enumerator, mostly implemented in the Differentiated System Description Table ACPI table. The advantage of a bytecode approach is that unlike PnP BIOS code, the ACPI bytecode may be used in any operating system, even in 64-bit long mode.
Overall design decision was not without criticism. In November 2003, Linus Torvalds—author of the Linux kernel—described ACPI as "a complete design disaster in every way". In 2001, other senior Linux software developers like Alan Cox expressed concerns about the requirements that bytecode from an external source must be run by the kernel with full privileges, as well as the overall complexity of the ACPI specification. In 2014, Mark Shuttleworth, founder of the Ubuntu Linux distribution, compared ACPI with Trojan horses.
ACPI Component Architecture (ACPICA)
The ACPI Component Architecture, mainly written by Intel's engineers, provides an open-source platform-independent reference implementation of the operating system-related ACPI code. The ACPICA code is used by Linux, Haiku and FreeBSD, which supplement it with their operating-system specific code.History
The first revision of the ACPI specification was released in December 1996, supporting 16 and 32-bit addressing spaces. It was not until August 2000 that ACPI received 64-bit address support as well as support for multiprocessor workstations and servers with revision 2.0.In September 2004, revision 3.0 was released, bringing to the ACPI specification support for SATA controllers, PCI Express bus, multiprocessor support for more than 256 processors, ambient light sensors and user-presence devices, as well as extending the thermal model beyond the previous processor-centric support.
Released in June 2009, revision 4.0 of the ACPI specification added various new features to the design; most notable are the USB 3.0 support, logical processor idling support, and x2APIC support.
Revision 5.0 of the ACPI specification was released in December 2011, followed by the revision 5.1 that was released in July 2014.
The latest specification revision is 6.3, which was released in end of January 2019.
Operating systems
Microsoft's Windows 98 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. Windows 98 first edition disabled ACPI by default except on a whitelist of systems. Other operating systems, including later versions of Windows, eComStation, FreeBSD, NetBSD, OpenBSD, HP-UX, OpenVMS, Linux, and PC versions of Solaris, have at least some support for ACPI. Some newer operating systems, like Windows Vista, require that Computer must have an ACPI-compliant BIOS.Windows based operating systems use acpi.sys to access acpi events.
The 2.4 series of the Linux kernel had only minimal support for ACPI, with better support implemented 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, Windows 2000, Windows XP, and Windows Server 2003 only use ACPI if the BIOS date is after January 1, 1999, and for Windows 98 Second Edition this date is December 1, 1999. Similarly, Linux kernel 2.6 blacklisted any ACPI BIOS from before January 1, 2001.
Linux based operating systems can provide access to acpi events via acpid.
OSPM responsibilities
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.Power states
Global states
The ACPI Specification defines the following four global "Gx" states and six sleep "Sx" states for an ACPI-compliant computer system:| Gx | Name | Sx | Description |
| G0 | Working | S0 | The computer is running and the CPU executes instructions. "Awaymode" is a subset of S0, where monitor is off but background tasks are running |
| G1 | Sleeping | S0ix | Modern Standby, or "Low Power S0 Idle". Partial processor SoC sleep. |
| G1 | Sleeping | S1 | Power on Suspend : Processor caches are flushed, and the CPU stops executing instructions. The power to the CPU and RAM is maintained. Devices that do not indicate they must remain on may be powered off |
| G1 | Sleeping | S2 | CPU powered off. Dirty cache is flushed to RAM |
| G1 | Sleeping | S3 | commonly referred to as Standby, Sleep, or Suspend to RAM : RAM remains powered |
| G1 | Sleeping | S4 | Hibernation or Suspend to Disk: All content of the main memory is saved to non-volatile memory such as a hard drive, and the system is powered down |
| G2 | Soft Off | S5 | G2/S5 is almost the same as G3 Mechanical Off, except that the power supply unit still supplies power, at a minimum, to the power button to allow return to S0. A full reboot is required. No previous content is retained. Other components may remain powered so the computer can "wake" on input from the keyboard, clock, modem, LAN, or USB device |
| G3 | Mechanical Off | The computer's power has been totally removed via a mechanical switch. The power cord can be removed and the system is safe for disassembly |
The specification also defines a Legacy state: the state on an operating system which does not support ACPI. In this state, the hardware and power are not managed via ACPI, effectively disabling ACPI.
Device states
The device states D0–D3 are device dependent:- D0 or Fully On is the operating state.
- * As with S0ix, Intel has D0ix states for intermediate levels on the SoC.
- D1 and D2 are intermediate power-states whose definition varies by device.
- D3: The D3 state is further divided into D3 Hot, and D3 Cold :
- * Hot: A device can assert power management requests to transition to higher power states.
- * Cold or Off has the device powered off and unresponsive to its bus.
Processor states
- C0 is the operating state.
- C1 is a state where the processor is not executing instructions, but can return to an executing state essentially instantaneously. All ACPI-conformant processors must support this power state. Some processors, such as the Pentium 4, also support an Enhanced C1 state for lower power consumption.
- C2 is a state where the processor maintains all software-visible state, but may take longer to wake up. This processor state is optional.
- C3 is a state where the processor does not need to keep its cache coherent, but maintains other state. Some processors have variations on the C3 state that differ in how long it takes to wake the processor. This processor state is optional.
- Additional states are defined by manufacturers for some processors. For example, Intel's Haswell platform has states up to C10, where it distinguishes core states and package states.
Performance state
P-states have become known as SpeedStep in Intel processors, as PowerNow! or Cool'n'Quiet in AMD processors, and as PowerSaver in VIA processors.
- P0 maximum power and frequency
- P1 less than P0, voltage and frequency scaled
- P2 less than P1, voltage and frequency scaled
- Pn less than P, voltage and frequency scaled
Hardware interface
Function Fixed Hardware interfaces are platform-specific features, provided by platform manufacturers for the purposes of performance and failure recovery. Standard Intel-based PCs 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.
ACPI Platform Error Interface is a specification for reporting of hardware errors, e.g. from the chipset, to the operating system.
Firmware interface
ACPI defines many tables that provide the interface between an ACPI-compliant operating system, and system firmware. This includes Differentiated System Description Table, Secondary System Description Table, and Static Resource Affinity Table, for example.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. The AML can be decompiled by tools like Intel's iasl for purposes like patching the tables for expanding OS compatibility.
The Root System Description Pointer is located in a platform-dependent manner, and describes the rest of the tables.
Security risks
founder Mark Shuttleworth has likened ACPI to Trojan horses. He has described proprietary firmware as a security risk, saying that "firmware on your device is the NSA's best friend" and calling firmware "a Trojan horse of monumental proportions". He has pointed out that low quality, closed source firmware is a major threat to system security: "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". As a solution to this problem, he has called for open-source, declarative firmware, which instead of containing executable code, only describes "hardware linkage and dependencies".A custom ACPI table called the Windows Platform Binary Table is used by Microsoft to allow vendors to add software into the Windows OS automatically. Some vendors, such as Lenovo and Samsung, have been caught using this feature to install harmful software like Superfish. Windows versions older than Windows 7 do not support this feature, but alternative techniques can be used. This behavior has been compared to rootkits.