System Management Mode

System Management Mode (SMM, sometimes called ring -2) is an operating mode of x86 central processor units (CPUs) in which all normal execution, including the operating system, is suspended and special separate software, which is usually part of the firmware or a hardware-assisted debugger, is executed with high privileges.

单词	System management interrupt
释义	System management interrupt 英语百科 System Management Mode System Management Mode (SMM, sometimes called ring -2) is an operating mode of x86 central processor units (CPUs) in which all normal execution, including the operating system, is suspended and special separate software, which is usually part of the firmware or a hardware-assisted debugger, is executed with high privileges.
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System management interrupt

System Management Mode