Re: pmap nocache

[christos%astron.com@localhost (Christos Zoulas)]

In article <49E9C130.501%gmx.de@localhost>,
Christoph Egger  <Christoph_Egger%gmx.de@localhost> wrote:
>-=-=-=-=-=-
>
>Andrew Doran wrote:
>> On Thu, Apr 16, 2009 at 10:53:20PM +0200, Christoph Egger wrote:
>> 
>>> Attached x86_nocache.diff removes the TLB flush
>>> when mapping dma-safe memory.
>>>
>>> Attached pmap_md.diff adds a PMAP_MD_MASK.
>>> For x86 PAT feature you need six MD PMAP types.
>>>
>>> Comments?
>> 
>> Looks good to me, thanks for doing this - that bit of code has caused me
>> a lot of headaches recently.
>
>Committed.
>
>> IIRC bus_space does something similar but uses pmap_kenter_pa().
>
>You're asking for attached patch? :)
>
>> I think it would be worthwhile adding a flags argument to handle it.
>
>I'm (ab)using the prot argument for this. Either we add a flags argument
>or we change change the type of the prot argument.
>
>Christoph

I think we should add a flags argument instead.

christos