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memory allocated Load module in CICS region

 
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Manikandan K

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Joined: 29 Mar 2007
Posts: 12
Location: Tamilnadu

PostPosted: Fri May 30, 2008 12:00 am    Post subject: memory allocated Load module in CICS region
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How to find whether the load module in CICS region is working above the 16MB line or not.
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Bill O'Boyle

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Joined: 14 Jan 2008
Posts: 2504
Location: Atlanta, Georgia, USA

PostPosted: Fri May 30, 2008 12:22 am    Post subject: Re: memory allocated Load module in CICS region
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The AMODE set during the Link-Edit step specifies AMODE 24 (below the line) AMODE 31 (above the line) and (most recently) AMODE 64 (above the bar).

If you know the load-point address of the module and that address does not exceed X'007FFFFF' (the high-bit of the leftmost byte maybe "on", resulting in a value of X'80' which can be ignored), then the load-point address and AMODE is below the line/24.

HTH....

Regards,

Bill
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Garry Carroll

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Joined: 08 May 2006
Posts: 998
Location: Dublin, Ireland / Edinburgh, Scotland

PostPosted: Fri May 30, 2008 2:28 pm    Post subject: Re: memory allocated Load module in CICS region
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Manikandan K wrote:
How to find whether the load module in CICS region is working above the 16MB line or not.


The question is not very specific.

A program may be AMODE(24)/RMODE(24) which means everything to do with it must be "below". This must therefore be working "below".

A program which is AMODE(31)/RMODE(24) has the program "below" but the data may be "above" or "below". The question as to whether it is "working" above or below depends on what you mean.

A program which is AMODE(64)/RMODE(24) can be viewed in much the same way.

A program with RMODE(ANY) will be loaded "above" 16Mb if possible but may be loaded "below". Programs CANNOT be loaded above the 2Gb "bar".

The load-point of the module does not reflect the AMODE, it reflects the effective RMODE. The high-order and low-order bits in the PSW are used to indicate the execution mode. If the low-order bit is on (uneven address), this used to cause exception. It now indicates 64bit mode. If the low-order bit is off, the high-order bit being on indicates 31-bit mode.

Garry
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