Dynamic address translation with fetch protection in an emulated environment
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United States of America Patent
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Jun 28, 2016
Issued Date -
N/A
app pub date -
Feb 27, 2015
filing date -
Jan 11, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated is first obtained and an initial origin address of a translation table of the hierarchy of translation tables is obtained. Based on the obtained initial origin, a segment table entry is obtained. The segment table entry is configured to contain a format control and access validity fields. If the format control and access validity fields are enabled, the segment table entry further contains an access control field, a fetch protection field, and a segment-frame absolute address. Store operations are permitted only if the access control field matches a program access key provided by any one of a Program Status Word or an operand of a program instruction being emulated. Fetch operations are permitted if the program access key associated with the virtual address is equal to the segment access control field or the fetch protection field is not enabled.
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