Permissions checking for data processing instructions
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United States of America Patent
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Jan 7, 2014
Grant Date -
Apr 29, 2010
app pub date -
Oct 28, 2008
filing date -
Oct 28, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A data processing system having a processor and a target device processes decorated instructions (i.e. an instruction having a decoration value). A device of the data processing system such as the processor sends transactions to the target device over a system interconnect. The transactions include an indication of an instruction operation, an address associated with the instruction operation, a decoration value (i.e. a command to the target device to perform a function in addition to a primary function of the executed instruction), and access permissions associated with the address. The target device (e.g. a memory with functionality in addition to storage functionality) determines whether a decoration operation specified by the decoration value is permissible based on the received access permissions. The target device performs the decoration operation if appropriate permissions exist.
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