BSM Auditing: AUE_P_ONLINE

This is a rather specific question to Solaris's Audit_Events, I'm looking to see if anyone knows exactly what event AUE_P_ONLINE is.  Oracle Documenation or documentation at all is a little scarce on this particular system call event.

$ cat /etc/security/audit_event
262:AUE_P_ONLINE:p_online(2):as

Event Name: AUE_P_ONLINE
Event ID: 262
Event Class: ad
Mask: 0x00000800 

***sample line from praudit***

header,127,2,AUE_P_ONLINE,fe,box210,2013-09-12 19:18:01.514 +00:00,argument,1,0x56,processor ID,argument,2,0x3,flag,text,P_STATUS,subject,maint,maint,sysadmin,maint,sysadmin,26289,25113,0 0 0.0.0.0,return,failure: Invalid argument,-1  

header-token  
arg-token           (1, "processor ID", processor ID)