System Management Mode: Difference between revisions

Revision as of 13:49, 16 September 2020

Revision as of 10:06, 11 October 2020

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=={{Anchor|USB-LEGACY-SUPPORT}}Usage==

Initially, System Management Mode was used for implementing [[Advanced Power Management]] (APM) and, [[Legacy Plug and Play]] (Legacy PnP), [[Desktop Management Interface]] (DMI), [[MultiProcessor Specification]] (MPS) and PCI BIOS<ref>PCI BIOS specification, [[PCI-SIG]]</ref> features. However, BIOS manufacturers and OEMs have relied on SMM for newer functionality like [[Advanced Configuration and Power Interface]] (ACPI).<ref>{{cite web|url=http://blogs.msdn.com/b/carmencr/archive/2005/09/01/459194.aspx|title=SMIs Are EEEEVIL (Part 2)|publisher=Microsoft|work=msdn.com}}</ref><ref>{{Cite web|title=System Management Mode - OSDev Wiki|url=https://wiki.osdev.org/SMM|access-date=2020-09-12|website=wiki.osdev.org}}</ref>

Some uses of the System Management Mode are:

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* Manage system safety functions, such as shutdown on high CPU temperature and turning the fans on and off

* [[System Management BIOS]] (SMBIOS)

* [[MultiProcessor Specification]] (MPS, superseded by ACPI)

* [[Advanced Configuration and Power Interface]]

* Control power management operations, such as managing the [[Voltage regulator module]] and [[LPCIO]] ([[Super I/O]], [[Embedded Controller]] or [[Intelligent Platform Management Interface|IPMI]])