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    SubjectRe: [linux-dvb] [PATCH] Userspace tuner
    On 9/14/07, Manu Abraham <abraham.manu@gmail.com> wrote:
    > Joerg Roedel wrote:
    > > On Fri, Sep 14, 2007 at 11:57:59AM +0400, Manu Abraham wrote:
    > >>>>> What do you think about IOMMU?
    > >>>>>
    > >>>>>
    > >>>> Just because AMD or INTEL want to invent some whizzy new technology it
    > >>>> doesn't say anything about the TV card development and retail business.
    > >>>> Intel and AMD have teams of Linux engineers helping operating system
    > >>>> developers bring their ideas and technologies to new platforms. That's
    > a
    > >>>> million miles away from any of the TV board vendors I know of, who have
    > >>>> little or NO fulltime linux developers and consider the < 5% market
    > >>>> fringe at best.
    > >>>>
    > >>> it helps to virtualize devices and introduces newer features for that.
    > >>> Some interesting projects could be derrived out of that, there are
    > >>> quite a few interesting papers floating around how drivers could be
    > >>> handled in future.
    > >>>
    > >> IOMMU can be considered similar to the AGP GART, which is similar,
    > >> remapping the Addresses, as far as i understand.
    > >
    > > Common new IOMMUs have only very few in common with the AGP GART. In
    > > fact, with current modern IOMMU hardware it will be possible to
    > > implement secure userspace device drivers that are even able to do DMA.
    > > This is not possible with the GART.
    > >
    > >> Though you get a physical to virtual translation, what about interrupts,
    > >
    > > Modern IOMMUs are able to remap interrupts. This will solve the problem
    > > with PCI interrupt sharing.
    >
    > What CPU's are we talking about ?
    >

    upcoming x86-64 processors from the AMD side. I'm not into what Intel
    is doing in that area at the moment.

    Markus
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