Back Mode de gestió de sistema Catalan Režim správy systému Czech System Management Mode German Modo de Gerencia del Sistema Spanish システムマネジメントモード Japanese 시스템 관리 모드 Korean System Management Mode Russian System Management Mode Ukrainian 系统管理模式 Chinese
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| Microprocessor modes for the x86 architecture |
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| First supported platform shown in parentheses |
System Management Mode (SMM, sometimes called ring −2 in reference to protection rings)[1][2] is an operating mode of x86 central processor units (CPUs) in which all normal execution, including the operating system, is suspended. An alternate software system which usually resides in the computer's firmware, or a hardware-assisted debugger, is then executed with high privileges.
It was first released with the Intel 386SL.[3][4] While initially special SL versions were required for SMM, Intel incorporated SMM in its mainline 486 and Pentium processors in 1993. AMD implemented Intel's SMM with the Am386 processors in 1991.[5] It is available in all later microprocessors in the x86 architecture.[citation needed]
In ARM architecture the Exception Level 3 (EL3) mode is also referred as Secure Monitor Mode or System Management Mode.[6]
- ^ Domas, Christopher (2015-07-20). "The Memory Sinkhole" (PDF). Black Hat. Retrieved 2015-08-22.
- ^ Tereshkin, Alexander; Wojtczuk, Rafal (2009-07-29). "Introducing Ring -3 Rootkits" (PDF). Invisible Things Lab, Black Hat USA. p. 4. Retrieved 2015-08-22.
- ^ "SMIs Are EEEEVIL (Part 1)". msdn.com. Microsoft. 2020-07-17.
- ^ Ellis, Simson C., "The 386 SL Microprocessor in Notebook PCs", Intel Corporation, Microcomputer Solutions, March/April 1991, page 20
- ^ "AMD Am386SX/SXL/SXLV Datasheet" (PDF). AMD.
- ^ https://documentation-service.arm.com/static/5ed11e40ca06a95ce53f905c?token= [bare URL PDF]