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From: rickert@CS.NIU.EDU (Neil Rickert)
Newsgroups: comp.lang.asm370
Subject: Re: New System/3x0 Instruction
Message-ID: <9103171404.AA01042@ucbvax.Berkeley.EDU>
Date: 17 Mar 91 14:01:40 GMT
References: <9103171023.AA28323@ucbvax.Berkeley.EDU>
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Reply-To: IBM 370 Assembly Programming Discussion List
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In article <9103171023.AA28323@ucbvax.Berkeley.EDU> you write:
>On Sun, 10 Mar 91 13:03:10 -0600,
>   Neil Rickert <rickert@CS.NIU.EDU> said:
>>  You can't do that in an instruction.  An SVC routine -- yes.  An
>> instruction -- no.  The page tables are not a hardware feature but a
>> creation of the operating system.  Therefore a hardware instruction
>> cannot manipulate them.
>
>Really?  Ever heard of the MVS assists "OBTAIN LOCAL LOCK", "ADD FRR",
>etc.?  These are (microcoded) instructions which are sensitive to the
>format of MVS control blocks.  Look in the MVS Data Areas manual (or

 Sure they are.  But they are not considered System/3x0 instructions, and
are not documented in Principles of Operation.  Rather they are considered
part of a microcode assist for MVS.

--
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  Neil W. Rickert, Computer Science               <rickert@cs.niu.edu>
  Northern Illinois Univ.
  DeKalb, IL 60115                                   +1-815-753-6940