Date: Wed, 21 Sep 2011 13:24:01 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-hackers@freebsd.org, geoffrey levand <geoffrey.levand@mail.ru> Subject: Re: Sharing device driver between kernel and user space Message-ID: <201109211324.01978.hselasky@c2i.net> In-Reply-To: <E1R6Fvx-0005sO-00.geoffrey-levand-mail-ru@f177.mail.ru> References: <E1R65Aj-0003Fj-00.geoffrey-levand-mail-ru@f57.mail.ru> <201109202202.19481.hselasky@c2i.net> <E1R6Fvx-0005sO-00.geoffrey-levand-mail-ru@f177.mail.ru>
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On Wednesday 21 September 2011 08:05:25 geoffrey levand wrote: > I think you misunderstood what i need. If i got it right then cuse4bsd > allows user applications to create char devices, right ? I do not want to > create character devices from user space. My VUART kernel module should > provide the character device for user space. What i need is a way to > synchronize access to VUART data between kernel and user space. The kernel > device driver should provide 2 interfaces: one for user space (through > char dev) and the other for kernel land. The problem is how to synchronize > the access to VUART data between 2 lands because VUART cannot be shared by > both simultaneously. Ok, I'm not a PS3 expert. --HPS
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