Messages in this thread | | | Date | Tue, 7 Jan 2003 23:19:22 -0500 | From | Pete Zaitcev <> | Subject | User mode drivers (Honest does not pay here ...) |
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> I may be showing my ignorance here (won't be the first time) but this makes > me wonder if Linux could provide a way to do "user level drivers".
It is a question often asked in comp.os.linux.development.system. If performance penalties and security problems are no obstacle, a lot of hardware can be serviced with a user mode driver, except one that requires interrupts to operate. There is no way to deliver an interrupt safely to the user mode, because a device specific deactivation or ack-ing must be performed before interrupts are enabled (on i386 at least). Other problems can be worked around with ioperm and friends.
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