In <018b01cb9109$e3dc7440$ab955c...@net>, on 11/30/2010
at 07:43 PM, Gerhard Adam <gada...@charter.net> said:
>How would you branch to code above the 2GB bar, since none is allowed
>there?
B or BR.
>The obvious problem being how you would even get it loaded up there.
MVC.
>If I recall, the fundamental problem is that the PSW cannot be
>saved with an address greater than 31-bit for the next instruction
>since neither the TCB's or RB's have a large enough area to store
>it.
Well, an interrupt will store the entire PSW, but as you note the RB
and TCB don't have 128-bit fields to copy the old PSW to. Which means
that you might survive an interrupt but you're dog meat if the
processor is dispatched to some other unit of works.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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