Re: Mapping the framebuffer into kernel space

[Jon Smirl <jonsmirl@gmail.com>]

On 5/12/05, James Simmons <jsimmons@www.infradead.org> wrote:
> 
> > > > Could you generically rewrite fb_read/write to just use the image blitter?
> > >
> > > Yes.
> >
> > No.
> >
> > The imageblit routines convert between chunked pixels and the actual frame
> > buffer representation.
> > fb_{read,write}() access the raw frame buffer.
> 
> That means that we will never uses the hardware acceleration ever in this
> case :-( It will always be slow!!!!
> 
> > Probably the best solution is to set up a small ioremap()'ed window that can be
> > moved in fb_{read,write}() (assumed moving such a window is much cheaper than
> > ioremap() + iounmap()).
> 
> Does such functionality exist? Second can you do the same thing with
> request_region? We need to so fbcon and /dev/fb don't step on each other
> toes.

Before we get too far into this, has anyone determined if any user
space app exists that does read/write from fbdev? I can't see a real
need to keep this feature if no one is using it. If no one is using
it, it would be much simpler just to remove the functions.

-- 
Jon Smirl
jonsmirl@gmail.com


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