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An EXCP Request with a virtual TIDAL z/OS DFSMSdfp Advanced Services SC23-6861-01 |
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In Figure 1, the TCW points
to the virtual address of a TIDAL. The TIDAWs within the TIDAL point
either to storage areas that larger than 4K or to storage areas that
cross page boundaries. The TIDAL itself also crosses a page boundary.
Note that for EXCPVR requests, this would not be allowed because it
violates I/O architecture rules.
However, for EXCP requests, the virtual TIDAL may have any alignment
and may cross page boundaries - EXCP will translate the virtual TIDAL
to a real TIDAL and ensure proper alignment and ensure that page boundaries
are not crossed.
Figure 1. How EXCP translates an EXCP request with a storage
areas crossing page boundaries
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Copyright IBM Corporation 1990, 2014
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