Peter,
Thanks for the refresh. I did not know about z/Arch change.
Ed
On Oct 22, 2006, at 12:59 PM, Peter Relson wrote:
Q.Why is the nuc linked with sctr?
A.The nucleus is linked with SCTR in order to provide the flexibility
needed to manage CSECTs on an individual basis and
have some CSECTs above 16M
have some CSECTs below 16M
have some CSECTs cache-line-aligned
have some CSECTs placed discontiguously (used to be x'1000', as of
z/Arch now x'2000') and not even present after IPL completes
(IEAVNIP0
and IEAVNIPH for example)
Obviously the first two are, to some extent, possible for program
objects
using RMODE=SPLIT (but that sort of functionality is not available
anywhere
near early enough to be used for the nucleus. And of course
RMODE=SPLIT
support was developed long after.
Presumably the extra processing needed to load the additional control
information and to process this stuff was deemed necessary for the
nucleus
and not important enough to be accommodated afterwards.
Peter Relson
z/OS Core Technology Design
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