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Re: [OpenBIOS] Re: [RFC PATCH 0/2] QEMU/openbios: PPC Software TLB suppo

From: Segher Boessenkool
Subject: Re: [OpenBIOS] Re: [RFC PATCH 0/2] QEMU/openbios: PPC Software TLB support in the G4 family
Date: Thu, 25 Nov 2021 03:38:01 -0600
User-agent: Mutt/


On Thu, Nov 25, 2021 at 01:45:00AM +0100, BALATON Zoltan wrote:
> As for guests, those running on the said PowerMac G4 should have support 
> for these CPUs so maybe you can try some Mac OS X versions (or maybe 

OSX uses hardware pagetables.

> MorphOS but that is not the best for debugging as there's no source 
> available nor any help from its owners but just to see if it boots it may 
> be sufficient, it should work on real PowerMac G4).

I have no idea what MorphOS uses, but I bet HPT as well.  That is
because HPT is fastest in general.  Software TLB reloads are good in
special cases only; the most common is real-time OSes, which can use its
lower guaranteed latency for some special address spaces (and can have a
simpler address map in general).


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