Re: CSA 'above the bar'

John,

That makes no sense to me... I thought that a 31-bit program could
address x'00000000' -> 'x'0FFFFFFF' below the line, and the same above
the line. I.O.W. it could go up to x'8FFFFFFF' which means x'0FFFFFFF'
above ? This means that the hole is from x'00000000 90000000' -> ?

Regards

Herbie

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxx] On
Behalf Of Chase, John
Sent: 07 November 2007 17:20
To: IBM-MAIN@xxxxxxxxxxx
Subject: Re: CSA 'above the bar'

-----Original Message-----
From: IBM Mainframe Discussion List On Behalf Of Rick Fochtman

-----------------------<snip>-----------------------

The "bar" is the "hole" in z/OS between 2G and 4G for all address
spaces, as you said. The origin of this thread was the
desire for a CSA
in the "above the bar" area, similar to the CSA "below the line" and
the CSA "above the line". I termed the phrase GCSA for this
area (G for
the
64 bit Grande instructions ).


-----------------------<unsnip>---------------------
Huh? I was told that "The Bar" was the top of the 31-bit
addressable space. What did I miss?

The "bar" is actually 2GiB wide, beginning at 64-bit address
x'00000000_80000000' and ending at 64-bit address x'00000000_FFFFFFFF'.
In the context of this thread, the "bar" and the "hole" are one and the
same.

-jc-

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