how do the solaris make a context/address switch?

[lunight]

Hi all,
       do any body knows what the solaris does when a context/address switch happens? 
       since the entity of solaris schedule is kernel thread , and not like linux , solaris separates user address space and kernel address, so when a thread make a syscall, there will be a address space changing ..my question is :how the kernel make this happens? I know there is an ASI register in SPARC, it is said ASI has something to do with this procedure, anybody knows how to use it? another question is :is there any register like the cr3(x86) in sparc ? how to use it?

       I want to know these answers for so long..thx for your help.
 
 
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