Sharing device driver between kernel and user space

[geoffrey levand]

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.


--
Все возможности @Mail.Ru в твоем мобильном.
Просто зайди с телефона на m.mail.ru