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(nasm.info)Section B.4.294

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B.4.294. `SMI': System Management Interrupt
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     SMI                           ; F1                   [386,UNDOC]

   `SMI' puts some AMD processors into SMM mode. It is available on some
386 and 486 processors, and is only available when DR7 bit 12 is set,
otherwise it generates an Int 1.