Currently i'm developing VUART device drivers for PS3 architecture. VUART is
bi-directional FIFO queue between 2 logical partitions on PS3. I want to use
the device in the kernel and user space. During system boot PS3 system has to
read/write some data from/to the VUART devices and sometimes i want to access
the device from user space , e.g. with character device driver by using
read/write syscalls. The quuestion is what is the best solution to share the
device between kernel and user lands. One solution i found would be to
porohibit kernel access to the device as soon as a user application opens the
corresponding character device. And allow it again when the application calls
close syscall. The user space should have higher priority then the kernel. Are
there any better solutions for this problem ? Forgot to mention that a VUART
device cannot be accessed simultaneously by user land and the kernel. The VUART
devices are used by PS3 management logical partition to provide different
request/response services and event notification to other logical partitions.
E.g. setting video mode or configuring audio outputs.
Thanks.
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