Re: how to map it in linux

[Eric BEGOT <eric_begot@yahoo.fr>]

Nilanjan Roychowdhury wrote:
> I have a simple driver in Vxworks ( lets say in a flat memory RTOS)
> What I do is whenever my ISR detects any H/W intr it posts a message to a task T1. T 1 does the processing and then notifies the application task T2.
>
> How do I do the same in linux?? Is it possible at all.
> Regards
> Nilanjan
>
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Sure it's possible.
Read the book Writing Linux Device Drivers at 
http://www.xml.com/ldd/chapter/book/ to learn. The message queue 
communication is made the IPC Messages. But the problem is that the ISR 
work in kernel mode and I think that the kernel and a process can't 
share a same IPC Message queue. Implement it with signals, it would be 
better i guess. If u don't want, try the functions get_from_user() or 
copy_from_user().

Ciao :)


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