[OpenBIOS] Faulty Qemu SPARC64 IDE emulation?

[Blue Swirl]

On Tue, Dec 22, 2009 at 1:32 PM, Mark Cave-Ayland
<mark.cave-ayland at siriusit.co.uk> wrote:
> Igor Kovalenko wrote:
>
>> Bare minimum is to move legacy device registers, pci control registers
>> and pci memory space out of physical ram space. Obvious workaround is
>> to claim out patches of ram space so those cannot be mapped by client,
>> downside is that looking at memory issues is non-trivial with non-uniform
>> mapping. Also physical memory would be at waste.
>
> Right, I think I understand now. So the obvious question to ask now is how
> is PCI configuration space mapped on Sparc64? I can see that on x86 it's
> mapped to an I/O port at 0xCF8 but I can't seem to find how this is
> implemented on Sparc64. Anyone have any idea?
>
>> Second required part is tick timer support. In my local experiments this
>> is only directly visible in linux kernel runs. Others (including helenos
>> and milax) do not really get to using timer yet.
>
> Well the Milax ISO does, because it tries to set an alarm to draw the twirly
> baton on screen. So if we can find a way of setting an alarm() for x ms then
> we can make use of it.
>
>>> Does that mean you've already started working on the Qemu side of this?
>>> If
>>> so, again let me know if I can help at all. Incidentally if you already
>>> have
>>> ideas for this, it's probably worth floating any proposals to the
>>> qemu-devel
>>> list first before doing any coding, just to make sure that they would be
>>> happy to accept patches implementing this new functionality.
>>
>> It was already proposed to allow sparc64 to shift pci memory space by
>> a constant offset (say 0x1fe00000000 as it is on real hardware)
>> so qemu could map device bars into 64bit address space
>> where those belong. Originally that change was quite huge since
>> all pci devices were touched, to support bars mapped above
>> 32bit space. Most of those changes are in qemu code already,
>> so it may be worth doing another patch submission round.
>
> Okay; are you working on this at the moment? I've tried searching for
> sparc64 pci memory and qemu but don't seem to have found any hits. Can you
> point me towards the relevant patches?

Please try these patches.
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