Re: [Qemu-devel] [PATCH 3/6] target-alpha: Reduce internal processor registers for user-mode.

[Richard Henderson]

On 01/06/2010 01:55 AM, Tristan Gingold wrote:
> > The existing set of IPRs is totally irrelevant to user-mode emulation.
> > Indeed, they most are irrelevant to implementing kernel-mode emulation,
> > and would only be relevant to PAL-mode emulation, which I suspect that
> > no one will ever attempt.
>
> Interesting, that's the approach I used to emulate an es40 (ie full emulation 
> of 21264).
> This had the advantage to be able to use the genuine ROM.

Heh.  Well, far be it for me to disuade.  There's surely room for 
wanting to emulate at that level.

However, since (1) ROMs other than the few supported by MILO are 
probably not redistributable and (2) I have the sense that generic 
kernel stuff would go faster emulating the PALcode specification, I 
think there's also a reason to do it that way too.

All that said, there's currently nothing that distinguishes between 
anything but user-mode and system-mode.

I would be delighted to see your es40 patches...


r~