Re: [Xenomai] general kernel functions in RTDM?

[aking <jinxin16897123@163.com>]

On 7/16/2013 Tuesday 10:37 PM, Jan Kiszka wrote:
> On 2013-07-16 09:28, aking_jin wrote:
>> Hi,all
>> What should be take care of while using general kernel functions in
>> RTDM? for example: dma operation, GPIO operation and etc .
> Depends on their usage context. You can normally use Linux service while
> the driver is in Linux context. But once you run over an RT IRQ, RT
> timer handler or RT thread (kernel/userspace), most Linux services
> become taboo.
>
> DMA mapping/unmapping, e.g., may still work if it involves no hardware
> or software IOMMU, otherwise it is required to premap the regions during
> setup over a Linux context. GPIO may involve Linux code that
> synchronizes against concurrent access. If that code was hardened as
> part of the I-pipe patch, you are safe again.
>
> Hope this helped to get the general picture. Detailed answers depend on
> what you do, and on which hardware.
>
> Jan
>
How could I toggle gpio in isr of xenomai RTDM?
Thanks

-- 
Best Regards
aking_jin