[LinuxBIOS] #42: Disable SMM on K8 platforms

LinuxBIOS svn at openbios.org
Fri Nov 10 19:41:06 CET 2006

#42: Disable SMM on K8 platforms
    Reporter:  stepan             |           Owner:  stepan          
        Type:  defect             |          Status:  assigned        
    Priority:  major              |       Milestone:  Going mainstream
   Component:  code               |         Version:  v2              
  Resolution:                     |        Keywords:  SMM, security   
   Due_close:  MM/DD/YYYY         |   Include_gantt:  0               
Dependencies:                     |      Due_assign:  MM/DD/YYYY      
 Patchstatus:  there is no patch  |  
Changes (by stepan):

  * status:  new => assigned


 SMM is a CPU/Northbridge thing on AMD64 processors. No need to do anything
 with the chipset. Check out chapter 6 of the the BKDG at

 What we _might_ want do though is add a small SMM handler at 38000 but
 that is a completely different issue.

 SMM_BASE register holds the base of the system management memory region,
 and its default value is 30000h. The first SMI handler instruction is
 fetched at SMM_BASE + 8000h.

Ticket URL: <http://tracker.linuxbios.org/trac/LinuxBIOS/ticket/42#comment:4>
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