Re: [Qemu-devel] Linux framebuffer emulation in qemu linux-user

[Ilyes Gouta <ilyes.gouta@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 2222 bytes --]

Hi,

> No, but it could be possible to convert the DirectFB ioctl structures
> between guest and host. Other ioctls are translated this way. I guess
> nobody has cared about framebuffer support yet.

DirectFB (on the sh4 side) is just a client which is interacting with the
framebuffer. It doesn't have its "own" set of ioctls.

Is handling FBIOGET_FSCREENINFO, FBIOGET_VSCREENINFO and FBIOPUT_VSCREENINFO
enough to abstract a basic Linux framebuffer and emulate it (by not
forwarding these to a native framebuffer)?

-Ilyes

On Thu, Sep 9, 2010 at 9:57 PM, Blue Swirl <blauwirbel@gmail.com> wrote:

> On Thu, Sep 9, 2010 at 8:39 PM, Ilyes Gouta <ilyes.gouta@gmail.com> wrote:
> > Hi,
> > Well, actually I'd like to run sh4 binaries in linux-user mode, where
> these
> > are actually DirectFB applications which rely on the standard Linux
> > framebuffer to display things.
> > In my use case, I'd like to route these ioctl in qemu to be handled by
> the
> > SDL back-end (or even a DirectFB instance running on the host) instead of
> > being dispatched to the native framebuffer driver, running on the host.
> > Is this feature available in the current qemu code base?
>
> No, but it could be possible to convert the DirectFB ioctl structures
> between guest and host. Other ioctls are translated this way. I guess
> nobody has cared about framebuffer support yet.
>
> See linux-user/ioctls.h.
>
> > Thanks,
> > -Ilyes
> >
> > On Thu, Sep 9, 2010 at 9:28 PM, Blue Swirl <blauwirbel@gmail.com> wrote:
> >>
> >> On Thu, Sep 9, 2010 at 8:19 PM, Ilyes Gouta <ilyes.gouta@gmail.com>
> wrote:
> >> > Hi,
> >> > Is it possible, as of today, to emulate a classic Linux framebuffer
> when
> >> > using qemu linux-user mode?
> >> > At a first glance, I saw in the code that
> >> > FBIOGET_FSCREENINFO, FBIOGET_VSCREENINFO and FBIOPUT_VSCREENINFO being
> >> > declared by couldn't locate where they're handled. Are these hooked to
> >> > the
> >> > SDL back-end?
> >>
> >> SDL is only used for system emulation. It should be possible to add
> >> conversions (for example, from PPC 32 bit BE to x86_64 64 bit LE) for
> >> FB ioctls in order to pass them to the host FB device. But what would
> >> be the use case for this?
> >
> >
>

[-- Attachment #2: Type: text/html, Size: 3535 bytes --]