Bitfields for Intel 82371MX Miscellaneous SMI Enable register:
Bit(s)	Description	)
 7-4	reserved
 3	Write to APMC Port
 2	SRBTN#
 1	BATLOW#
 0	reserved
Note:	Enables SMI# generation for the above hardware events
SeeAlso: #01168,#01199,PORT xxxxh"Intel 82371"