Synchronizing split user-mode/kernel-mode device driver architecture
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United States of America Patent
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Apr 30, 2013
Grant Date -
Aug 13, 2009
app pub date -
Feb 7, 2008
filing date -
Feb 7, 2008
priority date (Note) -
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Abstract
A device driver includes a kernel mode and a user-mode module. The device driver may access device registers while operating in user-mode to promote system stability while providing a low-latency software response from the system upon interrupts. The device driver may include kernel stubs that are loaded into the operating system, and may be device specific code written. The stubs may be called by a reflector to handle exceptions caught by the stubs. A reset stub may be invoked by the reflector when the user-mode module or host terminates abruptly or detects an interrupt storm. The reset stub may also be invoked if errant direct memory access DMA operations are being performed by a hardware device. The reset stub may ensure that hardware immediately stops unfinished DMA from further transfer, and may be called by the user-mode driver module.
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