Implementing user mode foreign device attachment to memory channel
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United States of America Patent
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Aug 4, 2015
Grant Date -
Jul 10, 2014
app pub date -
Jan 10, 2013
filing date -
Jan 10, 2013
priority date (Note) -
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Abstract
A method, system and computer program product are provided for implementing attachment of a user mode foreign device to a memory channel in a computer system. A user mode foreign device is attached to the memory channel using memory mapping of device registers and device buffers to the processor address space. The storage capacity on the device is doubly mapped in the address space creating separate control and data address spaces to allow user mode processes to control the device therefore eliminating the need for software system calls. A processor Memory Management Unit (MMU) coordinates multiple user processes accessing the device registers and buffers providing address space protection of each of interfaces, shifting device protection to the processor MMU from system software.
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